mirror of
https://github.com/libretro/RetroArch.git
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2746 lines
108 KiB
C
2746 lines
108 KiB
C
#ifndef dr_mp3_h
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#define dr_mp3_h
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#define DR_MP3_NO_STDIO
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#include <retro_inline.h>
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typedef int8_t drmp3_int8;
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typedef uint8_t drmp3_uint8;
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typedef int16_t drmp3_int16;
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typedef uint16_t drmp3_uint16;
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typedef int32_t drmp3_int32;
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typedef uint32_t drmp3_uint32;
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typedef int64_t drmp3_int64;
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typedef uint64_t drmp3_uint64;
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typedef drmp3_uint8 drmp3_bool8;
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typedef drmp3_uint32 drmp3_bool32;
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#define DRMP3_TRUE 1
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#define DRMP3_FALSE 0
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#define DRMP3_MAX_SAMPLES_PER_FRAME (1152*2)
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/* Low Level Push API
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* ================== */
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typedef struct
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{
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int frame_bytes;
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int channels;
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int hz;
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int layer;
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int bitrate_kbps;
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} drmp3dec_frame_info;
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typedef struct
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{
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float mdct_overlap[2][9*32];
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float qmf_state[15*2*32];
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int reserv;
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int free_format_bytes;
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unsigned char header[4];
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unsigned char reserv_buf[511];
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} drmp3dec;
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/* Initializes a low level decoder. */
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void drmp3dec_init(drmp3dec *dec);
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/* Reads a frame from a low level decoder. */
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int drmp3dec_decode_frame(drmp3dec *dec, const unsigned char *mp3, int mp3_bytes, short *pcm, drmp3dec_frame_info *info);
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/* Main API (Pull API)
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* ===================*/
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typedef struct drmp3_src drmp3_src;
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typedef drmp3_uint64 (* drmp3_src_read_proc)(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, void* pUserData); /* Returns the number of frames that were read. */
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typedef enum
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{
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drmp3_src_algorithm_none,
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drmp3_src_algorithm_linear
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} drmp3_src_algorithm;
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#define DRMP3_SRC_CACHE_SIZE_IN_FRAMES 512
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typedef struct
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{
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drmp3_src* pSRC;
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float pCachedFrames[2 * DRMP3_SRC_CACHE_SIZE_IN_FRAMES];
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drmp3_uint32 cachedFrameCount;
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drmp3_uint32 iNextFrame;
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} drmp3_src_cache;
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typedef struct
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{
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drmp3_uint32 sampleRateIn;
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drmp3_uint32 sampleRateOut;
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drmp3_uint32 channels;
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drmp3_src_algorithm algorithm;
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drmp3_uint32 cacheSizeInFrames; /* The number of frames to read from the client at a time. */
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} drmp3_src_config;
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struct drmp3_src
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{
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drmp3_src_config config;
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drmp3_src_read_proc onRead;
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void* pUserData;
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float bin[256];
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drmp3_src_cache cache; /* <-- For simplifying and optimizing client -> memory reading. */
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union
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{
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struct
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{
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float alpha;
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drmp3_bool32 isPrevFramesLoaded : 1;
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drmp3_bool32 isNextFramesLoaded : 1;
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} linear;
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} algo;
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};
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typedef enum
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{
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drmp3_seek_origin_start,
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drmp3_seek_origin_current
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} drmp3_seek_origin;
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/* Callback for when data is read. Return value is the number of bytes actually read.
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*
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* pUserData [in] The user data that was passed to drmp3_init(), drmp3_open() and family.
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* pBufferOut [out] The output buffer.
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* bytesToRead [in] The number of bytes to read.
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*
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* Returns the number of bytes actually read.
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*
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* A return value of less than bytesToRead indicates the end of the stream. Do _not_ return from this callback until
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* either the entire bytesToRead is filled or you have reached the end of the stream.
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*/
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typedef size_t (* drmp3_read_proc)(void* pUserData, void* pBufferOut, size_t bytesToRead);
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/* Callback for when data needs to be seeked.
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*
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* pUserData [in] The user data that was passed to drmp3_init(), drmp3_open() and family.
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* offset [in] The number of bytes to move, relative to the origin. Will never be negative.
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* origin [in] The origin of the seek - the current position or the start of the stream.
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*
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* Returns whether or not the seek was successful.
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*
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* Whether or not it is relative to the beginning or current position is determined by the "origin" parameter which
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* will be either drmp3_seek_origin_start or drmp3_seek_origin_current.
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*/
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typedef drmp3_bool32 (* drmp3_seek_proc)(void* pUserData, int offset, drmp3_seek_origin origin);
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typedef struct
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{
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drmp3_uint32 outputChannels;
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drmp3_uint32 outputSampleRate;
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} drmp3_config;
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typedef struct
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{
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drmp3dec decoder;
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drmp3dec_frame_info frameInfo;
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drmp3_uint32 channels;
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drmp3_uint32 sampleRate;
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drmp3_read_proc onRead;
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drmp3_seek_proc onSeek;
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void* pUserData;
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drmp3_uint32 frameChannels; /* The number of channels in the currently loaded MP3 frame. Internal use only. */
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drmp3_uint32 frameSampleRate; /* The sample rate of the currently loaded MP3 frame. Internal use only */
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drmp3_uint32 framesConsumed;
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drmp3_uint32 framesRemaining;
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drmp3_int16 frames[DRMP3_MAX_SAMPLES_PER_FRAME];
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drmp3_src src;
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size_t dataSize;
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size_t dataCapacity;
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drmp3_uint8* pData;
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drmp3_bool32 atEnd : 1;
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struct
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{
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const drmp3_uint8* pData;
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size_t dataSize;
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size_t currentReadPos;
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} memory; /* Only used for decoders that were opened against a block of memory. */
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} drmp3;
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/* Initializes an MP3 decoder.
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*
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* onRead [in] The function to call when data needs to be read from the client.
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* onSeek [in] The function to call when the read position of the client data needs to move.
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* pUserData [in, optional] A pointer to application defined data that will be passed to onRead and onSeek.
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*
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* Returns true if successful; false otherwise.
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*
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* Close the loader with drmp3_uninit().
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*
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* See also: drmp3_init_file(), drmp3_init_memory(), drmp3_uninit()
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*/
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drmp3_bool32 drmp3_init(drmp3* pMP3, drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, const drmp3_config* pConfig);
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/* Initializes an MP3 decoder from a block of memory.
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*
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* This does not create a copy of the data. It is up to the application to ensure the buffer remains valid for
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* the lifetime of the drmp3 object.
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*
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* The buffer should contain the contents of the entire MP3 file.
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*/
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drmp3_bool32 drmp3_init_memory(drmp3* pMP3, const void* pData, size_t dataSize, const drmp3_config* pConfig);
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#ifndef DR_MP3_NO_STDIO
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/* Initializes an MP3 decoder from a file.
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*
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* This holds the internal FILE object until drmp3_uninit() is called. Keep this in mind if you're caching drmp3
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* objects because the operating system may restrict the number of file handles an application can have open at
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* any given time.
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*/
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drmp3_bool32 drmp3_init_file(drmp3* pMP3, const char* filePath, const drmp3_config* pConfig);
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#endif
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/* Uninitializes an MP3 decoder. */
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void drmp3_uninit(drmp3* pMP3);
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/* Reads PCM frames as interleaved 32-bit IEEE floating point PCM.
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*
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* Note that framesToRead specifies the number of PCM frames to read, _not_ the number of MP3 frames.
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*/
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drmp3_uint64 drmp3_read_f32(drmp3* pMP3, drmp3_uint64 framesToRead, float* pBufferOut);
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/* Seeks to a specific frame.
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*
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* Note that this is _not_ an MP3 frame, but rather a PCM frame.
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*/
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drmp3_bool32 drmp3_seek_to_frame(drmp3* pMP3, drmp3_uint64 frameIndex);
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/* Opens an decodes an entire MP3 stream as a single operation.
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*
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* pConfig is both an input and output. On input it contains what you want. On output it contains what you got.
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*
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* Free the returned pointer with drmp3_free().
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*/
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float* drmp3_open_and_decode_f32(drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount);
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float* drmp3_open_and_decode_memory_f32(const void* pData, size_t dataSize, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount);
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#ifndef DR_MP3_NO_STDIO
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float* drmp3_open_and_decode_file_f32(const char* filePath, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount);
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#endif
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/* Frees any memory that was allocated by a public drmp3 API. */
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void drmp3_free(void* p);
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#ifdef __cplusplus
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}
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#endif
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#endif /* dr_mp3_h */
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/*
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*
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* IMPLEMENTATION
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*
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*/
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#ifdef DR_MP3_IMPLEMENTATION
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <limits.h> /* For INT_MAX */
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#define DRMP3_MAX_FREE_FORMAT_FRAME_SIZE 2304 /* more than ISO spec's */
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#define DRMP3_MAX_FRAME_SYNC_MATCHES 10
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#define DRMP3_MAX_L3_FRAME_PAYLOAD_BYTES DRMP3_MAX_FREE_FORMAT_FRAME_SIZE /* MUST be >= 320000/8/32000*1152 = 1440 */
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#define DRMP3_MAX_BITRESERVOIR_BYTES 511
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#define DRMP3_SHORT_BLOCK_TYPE 2
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#define DRMP3_STOP_BLOCK_TYPE 3
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#define DRMP3_MODE_MONO 3
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#define DRMP3_MODE_JOINT_STEREO 1
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#define DRMP3_HDR_SIZE 4
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#define DRMP3_HDR_IS_MONO(h) (((h[3]) & 0xC0) == 0xC0)
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#define DRMP3_HDR_IS_MS_STEREO(h) (((h[3]) & 0xE0) == 0x60)
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#define DRMP3_HDR_IS_FREE_FORMAT(h) (((h[2]) & 0xF0) == 0)
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#define DRMP3_HDR_IS_CRC(h) (!((h[1]) & 1))
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#define DRMP3_HDR_TEST_PADDING(h) ((h[2]) & 0x2)
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#define DRMP3_HDR_TEST_MPEG1(h) ((h[1]) & 0x8)
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#define DRMP3_HDR_TEST_NOT_MPEG25(h) ((h[1]) & 0x10)
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#define DRMP3_HDR_TEST_I_STEREO(h) ((h[3]) & 0x10)
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#define DRMP3_HDR_TEST_MS_STEREO(h) ((h[3]) & 0x20)
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#define DRMP3_HDR_GET_STEREO_MODE(h) (((h[3]) >> 6) & 3)
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#define DRMP3_HDR_GET_STEREO_MODE_EXT(h) (((h[3]) >> 4) & 3)
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#define DRMP3_HDR_GET_LAYER(h) (((h[1]) >> 1) & 3)
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#define DRMP3_HDR_GET_BITRATE(h) ((h[2]) >> 4)
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#define DRMP3_HDR_GET_SAMPLE_RATE(h) (((h[2]) >> 2) & 3)
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#define DRMP3_HDR_GET_MY_SAMPLE_RATE(h) (DRMP3_HDR_GET_SAMPLE_RATE(h) + (((h[1] >> 3) & 1) + ((h[1] >> 4) & 1))*3)
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#define DRMP3_HDR_IS_FRAME_576(h) ((h[1] & 14) == 2)
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#define DRMP3_HDR_IS_LAYER_1(h) ((h[1] & 6) == 6)
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#define DRMP3_BITS_DEQUANTIZER_OUT -1
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#define DRMP3_MAX_SCF (255 + DRMP3_BITS_DEQUANTIZER_OUT*4 - 210)
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#define DRMP3_MAX_SCFI ((DRMP3_MAX_SCF + 3) & ~3)
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#define DRMP3_MIN(a, b) ((a) > (b) ? (b) : (a))
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#define DRMP3_MAX(a, b) ((a) < (b) ? (b) : (a))
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#if !defined(DR_MP3_NO_SIMD)
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#if !defined(DR_MP3_ONLY_SIMD) && (defined(_M_X64) || defined(_M_ARM64) || defined(__x86_64__) || defined(__aarch64__))
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/* x64 always have SSE2, arm64 always have neon, no need for generic code */
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#define DR_MP3_ONLY_SIMD
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#endif
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#if (defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))) || ((defined(__i386__) || defined(__x86_64__)) && defined(__SSE2__))
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#if defined(_MSC_VER)
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#include <intrin.h>
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#endif
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#include <immintrin.h>
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#define DRMP3_HAVE_SSE 1
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#define DRMP3_HAVE_SIMD 1
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#define DRMP3_VSTORE _mm_storeu_ps
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#define DRMP3_VLD _mm_loadu_ps
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#define DRMP3_VSET _mm_set1_ps
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#define DRMP3_VADD _mm_add_ps
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#define DRMP3_VSUB _mm_sub_ps
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#define DRMP3_VMUL _mm_mul_ps
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#define DRMP3_VMAC(a, x, y) _mm_add_ps(a, _mm_mul_ps(x, y))
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#define DRMP3_VMSB(a, x, y) _mm_sub_ps(a, _mm_mul_ps(x, y))
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#define DRMP3_VMUL_S(x, s) _mm_mul_ps(x, _mm_set1_ps(s))
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#define DRMP3_VREV(x) _mm_shuffle_ps(x, x, _MM_SHUFFLE(0, 1, 2, 3))
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typedef __m128 drmp3_f4;
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#if defined(_MSC_VER) || defined(DR_MP3_ONLY_SIMD)
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#define drmp3_cpuid __cpuid
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#else
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static INLINE __attribute__((always_inline)) void drmp3_cpuid(int CPUInfo[], const int InfoType)
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{
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#if defined(__PIC__)
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__asm__ __volatile__(
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#if defined(__x86_64__)
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"push %%rbx\n"
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"cpuid\n"
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"xchgl %%ebx, %1\n"
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"pop %%rbx\n"
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#else
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"xchgl %%ebx, %1\n"
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"cpuid\n"
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"xchgl %%ebx, %1\n"
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#endif
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: "=a" (CPUInfo[0]), "=r" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3])
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: "a" (InfoType));
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#else
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__asm__ __volatile__(
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"cpuid"
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: "=a" (CPUInfo[0]), "=b" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3])
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: "a" (InfoType));
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#endif
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}
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#endif
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static int drmp3_have_simd()
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{
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#ifdef DR_MP3_ONLY_SIMD
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return 1;
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#else
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static int g_have_simd;
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int CPUInfo[4];
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#ifdef MINIMP3_TEST
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static int g_counter;
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if (g_counter++ > 100)
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goto test_nosimd;
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#endif
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if (g_have_simd)
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return g_have_simd - 1;
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drmp3_cpuid(CPUInfo, 0);
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if (CPUInfo[0] > 0)
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{
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drmp3_cpuid(CPUInfo, 1);
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g_have_simd = (CPUInfo[3] & (1 << 26)) + 1; /* SSE2 */
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return g_have_simd - 1;
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}
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#ifdef MINIMP3_TEST
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test_nosimd:
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#endif
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g_have_simd = 1;
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return 0;
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#endif
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}
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#elif defined(__ARM_NEON) || defined(__aarch64__)
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#include <arm_neon.h>
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#define DRMP3_HAVE_SIMD 1
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#define DRMP3_VSTORE vst1q_f32
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#define DRMP3_VLD vld1q_f32
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#define DRMP3_VSET vmovq_n_f32
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#define DRMP3_VADD vaddq_f32
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#define DRMP3_VSUB vsubq_f32
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#define DRMP3_VMUL vmulq_f32
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#define DRMP3_VMAC(a, x, y) vmlaq_f32(a, x, y)
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#define DRMP3_VMSB(a, x, y) vmlsq_f32(a, x, y)
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#define DRMP3_VMUL_S(x, s) vmulq_f32(x, vmovq_n_f32(s))
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#define DRMP3_VREV(x) vcombine_f32(vget_high_f32(vrev64q_f32(x)), vget_low_f32(vrev64q_f32(x)))
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typedef float32x4_t drmp3_f4;
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static int drmp3_have_simd()
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{ /* TODO: detect neon for !DR_MP3_ONLY_SIMD */
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return 1;
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}
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#else
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#define DRMP3_HAVE_SIMD 0
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#ifdef DR_MP3_ONLY_SIMD
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#error DR_MP3_ONLY_SIMD used, but SSE/NEON not enabled
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#endif
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#endif
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#else
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#define DRMP3_HAVE_SIMD 0
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#endif
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typedef struct
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{
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const drmp3_uint8 *buf;
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int pos;
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int limit;
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} drmp3_bs;
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typedef struct
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{
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drmp3_uint8 total_bands;
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drmp3_uint8 stereo_bands;
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drmp3_uint8 bitalloc[64];
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drmp3_uint8 scfcod[64];
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float scf[3*64];
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} drmp3_L12_scale_info;
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typedef struct
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{
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drmp3_uint8 tab_offset;
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drmp3_uint8 code_tab_width;
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drmp3_uint8 band_count;
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} drmp3_L12_subband_alloc;
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typedef struct
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{
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const drmp3_uint8 *sfbtab;
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drmp3_uint16 part_23_length;
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drmp3_uint16 big_values;
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drmp3_uint16 scalefac_compress;
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drmp3_uint8 global_gain;
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drmp3_uint8 block_type;
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drmp3_uint8 mixed_block_flag;
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drmp3_uint8 n_long_sfb;
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drmp3_uint8 n_short_sfb;
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drmp3_uint8 table_select[3];
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drmp3_uint8 region_count[3];
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|
drmp3_uint8 subblock_gain[3];
|
|
drmp3_uint8 preflag;
|
|
drmp3_uint8 scalefac_scale;
|
|
drmp3_uint8 count1_table;
|
|
drmp3_uint8 scfsi;
|
|
} drmp3_L3_gr_info;
|
|
|
|
typedef struct
|
|
{
|
|
drmp3_bs bs;
|
|
drmp3_uint8 maindata[DRMP3_MAX_BITRESERVOIR_BYTES + DRMP3_MAX_L3_FRAME_PAYLOAD_BYTES];
|
|
drmp3_L3_gr_info gr_info[4];
|
|
float grbuf[2][576];
|
|
float scf[40];
|
|
drmp3_uint8 ist_pos[2][39];
|
|
float syn[18 + 15][2*32];
|
|
} drmp3dec_scratch;
|
|
|
|
static void drmp3_bs_init(drmp3_bs *bs, const drmp3_uint8 *data, int bytes)
|
|
{
|
|
bs->buf = data;
|
|
bs->pos = 0;
|
|
bs->limit = bytes*8;
|
|
}
|
|
|
|
static drmp3_uint32 drmp3_bs_get_bits(drmp3_bs *bs, int n)
|
|
{
|
|
drmp3_uint32 next, cache = 0, s = bs->pos & 7;
|
|
int shl = n + s;
|
|
const drmp3_uint8 *p = bs->buf + (bs->pos >> 3);
|
|
if ((bs->pos += n) > bs->limit)
|
|
return 0;
|
|
next = *p++ & (255 >> s);
|
|
while ((shl -= 8) > 0)
|
|
{
|
|
cache |= next << shl;
|
|
next = *p++;
|
|
}
|
|
return cache | (next >> -shl);
|
|
}
|
|
|
|
static int drmp3_hdr_valid(const drmp3_uint8 *h)
|
|
{
|
|
return h[0] == 0xff &&
|
|
((h[1] & 0xF0) == 0xf0 || (h[1] & 0xFE) == 0xe2) &&
|
|
(DRMP3_HDR_GET_LAYER(h) != 0) &&
|
|
(DRMP3_HDR_GET_BITRATE(h) != 15) &&
|
|
(DRMP3_HDR_GET_SAMPLE_RATE(h) != 3);
|
|
}
|
|
|
|
static int drmp3_hdr_compare(const drmp3_uint8 *h1, const drmp3_uint8 *h2)
|
|
{
|
|
return drmp3_hdr_valid(h2) &&
|
|
((h1[1] ^ h2[1]) & 0xFE) == 0 &&
|
|
((h1[2] ^ h2[2]) & 0x0C) == 0 &&
|
|
!(DRMP3_HDR_IS_FREE_FORMAT(h1) ^ DRMP3_HDR_IS_FREE_FORMAT(h2));
|
|
}
|
|
|
|
static unsigned drmp3_hdr_bitrate_kbps(const drmp3_uint8 *h)
|
|
{
|
|
static const drmp3_uint8 halfrate[2][3][15] = {
|
|
{ { 0,4,8,12,16,20,24,28,32,40,48,56,64,72,80 }, { 0,4,8,12,16,20,24,28,32,40,48,56,64,72,80 }, { 0,16,24,28,32,40,48,56,64,72,80,88,96,112,128 } },
|
|
{ { 0,16,20,24,28,32,40,48,56,64,80,96,112,128,160 }, { 0,16,24,28,32,40,48,56,64,80,96,112,128,160,192 }, { 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224 } },
|
|
};
|
|
return 2*halfrate[!!DRMP3_HDR_TEST_MPEG1(h)][DRMP3_HDR_GET_LAYER(h) - 1][DRMP3_HDR_GET_BITRATE(h)];
|
|
}
|
|
|
|
static unsigned drmp3_hdr_sample_rate_hz(const drmp3_uint8 *h)
|
|
{
|
|
static const unsigned g_hz[3] = { 44100, 48000, 32000 };
|
|
return g_hz[DRMP3_HDR_GET_SAMPLE_RATE(h)] >> (int)!DRMP3_HDR_TEST_MPEG1(h) >> (int)!DRMP3_HDR_TEST_NOT_MPEG25(h);
|
|
}
|
|
|
|
static unsigned drmp3_hdr_frame_samples(const drmp3_uint8 *h)
|
|
{
|
|
return DRMP3_HDR_IS_LAYER_1(h) ? 384 : (1152 >> (int)DRMP3_HDR_IS_FRAME_576(h));
|
|
}
|
|
|
|
static int drmp3_hdr_frame_bytes(const drmp3_uint8 *h, int free_format_size)
|
|
{
|
|
int frame_bytes = drmp3_hdr_frame_samples(h)*drmp3_hdr_bitrate_kbps(h)*125/drmp3_hdr_sample_rate_hz(h);
|
|
if (DRMP3_HDR_IS_LAYER_1(h))
|
|
{
|
|
frame_bytes &= ~3; /* slot align */
|
|
}
|
|
return frame_bytes ? frame_bytes : free_format_size;
|
|
}
|
|
|
|
static int drmp3_hdr_padding(const drmp3_uint8 *h)
|
|
{
|
|
return DRMP3_HDR_TEST_PADDING(h) ? (DRMP3_HDR_IS_LAYER_1(h) ? 4 : 1) : 0;
|
|
}
|
|
|
|
#ifndef DR_MP3_ONLY_MP3
|
|
static const drmp3_L12_subband_alloc *drmp3_L12_subband_alloc_table(const drmp3_uint8 *hdr, drmp3_L12_scale_info *sci)
|
|
{
|
|
const drmp3_L12_subband_alloc *alloc;
|
|
int mode = DRMP3_HDR_GET_STEREO_MODE(hdr);
|
|
int nbands, stereo_bands = (mode == DRMP3_MODE_MONO) ? 0 : (mode == DRMP3_MODE_JOINT_STEREO) ? (DRMP3_HDR_GET_STEREO_MODE_EXT(hdr) << 2) + 4 : 32;
|
|
|
|
if (DRMP3_HDR_IS_LAYER_1(hdr))
|
|
{
|
|
static const drmp3_L12_subband_alloc g_alloc_L1[] = { { 76, 4, 32 } };
|
|
alloc = g_alloc_L1;
|
|
nbands = 32;
|
|
} else if (!DRMP3_HDR_TEST_MPEG1(hdr))
|
|
{
|
|
static const drmp3_L12_subband_alloc g_alloc_L2M2[] = { { 60, 4, 4 }, { 44, 3, 7 }, { 44, 2, 19 } };
|
|
alloc = g_alloc_L2M2;
|
|
nbands = 30;
|
|
} else
|
|
{
|
|
static const drmp3_L12_subband_alloc g_alloc_L2M1[] = { { 0, 4, 3 }, { 16, 4, 8 }, { 32, 3, 12 }, { 40, 2, 7 } };
|
|
int sample_rate_idx = DRMP3_HDR_GET_SAMPLE_RATE(hdr);
|
|
unsigned kbps = drmp3_hdr_bitrate_kbps(hdr) >> (int)(mode != DRMP3_MODE_MONO);
|
|
if (!kbps) /* free-format */
|
|
{
|
|
kbps = 192;
|
|
}
|
|
|
|
alloc = g_alloc_L2M1;
|
|
nbands = 27;
|
|
if (kbps < 56)
|
|
{
|
|
static const drmp3_L12_subband_alloc g_alloc_L2M1_lowrate[] = { { 44, 4, 2 }, { 44, 3, 10 } };
|
|
alloc = g_alloc_L2M1_lowrate;
|
|
nbands = sample_rate_idx == 2 ? 12 : 8;
|
|
} else if (kbps >= 96 && sample_rate_idx != 1)
|
|
{
|
|
nbands = 30;
|
|
}
|
|
}
|
|
|
|
sci->total_bands = (drmp3_uint8)nbands;
|
|
sci->stereo_bands = (drmp3_uint8)DRMP3_MIN(stereo_bands, nbands);
|
|
|
|
return alloc;
|
|
}
|
|
|
|
static void drmp3_L12_read_scalefactors(drmp3_bs *bs, drmp3_uint8 *pba, drmp3_uint8 *scfcod, int bands, float *scf)
|
|
{
|
|
static const float g_deq_L12[18*3] = {
|
|
#define DRMP3_DQ(x) 9.53674316e-07f/x, 7.56931807e-07f/x, 6.00777173e-07f/x
|
|
DRMP3_DQ(3),DRMP3_DQ(7),DRMP3_DQ(15),DRMP3_DQ(31),DRMP3_DQ(63),DRMP3_DQ(127),DRMP3_DQ(255),DRMP3_DQ(511),DRMP3_DQ(1023),DRMP3_DQ(2047),DRMP3_DQ(4095),DRMP3_DQ(8191),DRMP3_DQ(16383),DRMP3_DQ(32767),DRMP3_DQ(65535),DRMP3_DQ(3),DRMP3_DQ(5),DRMP3_DQ(9)
|
|
};
|
|
int i, m;
|
|
for (i = 0; i < bands; i++)
|
|
{
|
|
float s = 0;
|
|
int ba = *pba++;
|
|
int mask = ba ? 4 + ((19 >> scfcod[i]) & 3) : 0;
|
|
for (m = 4; m; m >>= 1)
|
|
{
|
|
if (mask & m)
|
|
{
|
|
int b = drmp3_bs_get_bits(bs, 6);
|
|
s = g_deq_L12[ba*3 - 6 + b % 3]*(1 << 21 >> b/3);
|
|
}
|
|
*scf++ = s;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void drmp3_L12_read_scale_info(const drmp3_uint8 *hdr, drmp3_bs *bs, drmp3_L12_scale_info *sci)
|
|
{
|
|
static const drmp3_uint8 g_bitalloc_code_tab[] = {
|
|
0,17, 3, 4, 5,6,7, 8,9,10,11,12,13,14,15,16,
|
|
0,17,18, 3,19,4,5, 6,7, 8, 9,10,11,12,13,16,
|
|
0,17,18, 3,19,4,5,16,
|
|
0,17,18,16,
|
|
0,17,18,19, 4,5,6, 7,8, 9,10,11,12,13,14,15,
|
|
0,17,18, 3,19,4,5, 6,7, 8, 9,10,11,12,13,14,
|
|
0, 2, 3, 4, 5,6,7, 8,9,10,11,12,13,14,15,16
|
|
};
|
|
const drmp3_L12_subband_alloc *subband_alloc = drmp3_L12_subband_alloc_table(hdr, sci);
|
|
|
|
int i, k = 0, ba_bits = 0;
|
|
const drmp3_uint8 *ba_code_tab = g_bitalloc_code_tab;
|
|
|
|
for (i = 0; i < sci->total_bands; i++)
|
|
{
|
|
drmp3_uint8 ba;
|
|
if (i == k)
|
|
{
|
|
k += subband_alloc->band_count;
|
|
ba_bits = subband_alloc->code_tab_width;
|
|
ba_code_tab = g_bitalloc_code_tab + subband_alloc->tab_offset;
|
|
subband_alloc++;
|
|
}
|
|
ba = ba_code_tab[drmp3_bs_get_bits(bs, ba_bits)];
|
|
sci->bitalloc[2*i] = ba;
|
|
if (i < sci->stereo_bands)
|
|
{
|
|
ba = ba_code_tab[drmp3_bs_get_bits(bs, ba_bits)];
|
|
}
|
|
sci->bitalloc[2*i + 1] = sci->stereo_bands ? ba : 0;
|
|
}
|
|
|
|
for (i = 0; i < 2*sci->total_bands; i++)
|
|
{
|
|
sci->scfcod[i] = (drmp3_uint8)(sci->bitalloc[i] ? DRMP3_HDR_IS_LAYER_1(hdr) ? 2 : drmp3_bs_get_bits(bs, 2) : 6);
|
|
}
|
|
|
|
drmp3_L12_read_scalefactors(bs, sci->bitalloc, sci->scfcod, sci->total_bands*2, sci->scf);
|
|
|
|
for (i = sci->stereo_bands; i < sci->total_bands; i++)
|
|
{
|
|
sci->bitalloc[2*i + 1] = 0;
|
|
}
|
|
}
|
|
|
|
static int drmp3_L12_dequantize_granule(float *grbuf, drmp3_bs *bs, drmp3_L12_scale_info *sci, int group_size)
|
|
{
|
|
int i, j, k, choff = 576;
|
|
for (j = 0; j < 4; j++)
|
|
{
|
|
float *dst = grbuf + group_size*j;
|
|
for (i = 0; i < 2*sci->total_bands; i++)
|
|
{
|
|
int ba = sci->bitalloc[i];
|
|
if (ba != 0)
|
|
{
|
|
if (ba < 17)
|
|
{
|
|
int half = (1 << (ba - 1)) - 1;
|
|
for (k = 0; k < group_size; k++)
|
|
{
|
|
dst[k] = (float)((int)drmp3_bs_get_bits(bs, ba) - half);
|
|
}
|
|
} else
|
|
{
|
|
unsigned mod = (2 << (ba - 17)) + 1; /* 3, 5, 9 */
|
|
unsigned code = drmp3_bs_get_bits(bs, mod + 2 - (mod >> 3)); /* 5, 7, 10 */
|
|
for (k = 0; k < group_size; k++, code /= mod)
|
|
{
|
|
dst[k] = (float)((int)(code % mod - mod/2));
|
|
}
|
|
}
|
|
}
|
|
dst += choff;
|
|
choff = 18 - choff;
|
|
}
|
|
}
|
|
return group_size*4;
|
|
}
|
|
|
|
static void drmp3_L12_apply_scf_384(drmp3_L12_scale_info *sci, const float *scf, float *dst)
|
|
{
|
|
int i, k;
|
|
memcpy(dst + 576 + sci->stereo_bands*18, dst + sci->stereo_bands*18, (sci->total_bands - sci->stereo_bands)*18*sizeof(float));
|
|
for (i = 0; i < sci->total_bands; i++, dst += 18, scf += 6)
|
|
{
|
|
for (k = 0; k < 12; k++)
|
|
{
|
|
dst[k + 0] *= scf[0];
|
|
dst[k + 576] *= scf[3];
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int drmp3_L3_read_side_info(drmp3_bs *bs, drmp3_L3_gr_info *gr, const drmp3_uint8 *hdr)
|
|
{
|
|
static const drmp3_uint8 g_scf_long[9][23] = {
|
|
{ 6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54,0 },
|
|
{ 6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54,0 },
|
|
{ 12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2,0 },
|
|
{ 6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54,0 },
|
|
{ 6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,54,62,70,76,36,0 },
|
|
{ 6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54,0 },
|
|
{ 4,4,4,4,4,4,6,6,8,8,10,12,16,20,24,28,34,42,50,54,76,158,0 },
|
|
{ 4,4,4,4,4,4,6,6,6,8,10,12,16,18,22,28,34,40,46,54,54,192,0 },
|
|
{ 4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102,26,0 }
|
|
};
|
|
static const drmp3_uint8 g_scf_short[9][40] = {
|
|
{ 4,4,4,4,4,4,4,4,4,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,30,30,30,40,40,40,18,18,18,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,30,30,30,40,40,40,18,18,18,0 },
|
|
{ 8,8,8,8,8,8,8,8,8,12,12,12,16,16,16,20,20,20,24,24,24,28,28,28,36,36,36,2,2,2,2,2,2,2,2,2,26,26,26,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,6,6,6,6,6,6,8,8,8,10,10,10,14,14,14,18,18,18,26,26,26,32,32,32,42,42,42,18,18,18,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,32,32,32,44,44,44,12,12,12,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,30,30,30,40,40,40,18,18,18,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,4,4,4,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,22,22,22,30,30,30,56,56,56,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,4,4,4,6,6,6,6,6,6,10,10,10,12,12,12,14,14,14,16,16,16,20,20,20,26,26,26,66,66,66,0 },
|
|
{ 4,4,4,4,4,4,4,4,4,4,4,4,6,6,6,8,8,8,12,12,12,16,16,16,20,20,20,26,26,26,34,34,34,42,42,42,12,12,12,0 }
|
|
};
|
|
static const drmp3_uint8 g_scf_mixed[9][40] = {
|
|
{ 6,6,6,6,6,6,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,30,30,30,40,40,40,18,18,18,0 },
|
|
{ 6,6,6,6,6,6,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,30,30,30,40,40,40,18,18,18,0 },
|
|
{ 12,12,12,4,4,4,8,8,8,12,12,12,16,16,16,20,20,20,24,24,24,28,28,28,36,36,36,2,2,2,2,2,2,2,2,2,26,26,26,0 },
|
|
{ 6,6,6,6,6,6,6,6,6,6,6,6,8,8,8,10,10,10,14,14,14,18,18,18,26,26,26,32,32,32,42,42,42,18,18,18,0 },
|
|
{ 6,6,6,6,6,6,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,32,32,32,44,44,44,12,12,12,0 },
|
|
{ 6,6,6,6,6,6,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,24,24,24,30,30,30,40,40,40,18,18,18,0 },
|
|
{ 4,4,4,4,4,4,6,6,4,4,4,6,6,6,8,8,8,10,10,10,12,12,12,14,14,14,18,18,18,22,22,22,30,30,30,56,56,56,0 },
|
|
{ 4,4,4,4,4,4,6,6,4,4,4,6,6,6,6,6,6,10,10,10,12,12,12,14,14,14,16,16,16,20,20,20,26,26,26,66,66,66,0 },
|
|
{ 4,4,4,4,4,4,6,6,4,4,4,6,6,6,8,8,8,12,12,12,16,16,16,20,20,20,26,26,26,34,34,34,42,42,42,12,12,12,0 }
|
|
};
|
|
|
|
unsigned tables, scfsi = 0;
|
|
int main_data_begin, part_23_sum = 0;
|
|
int sr_idx = DRMP3_HDR_GET_MY_SAMPLE_RATE(hdr);
|
|
int gr_count = DRMP3_HDR_IS_MONO(hdr) ? 1 : 2;
|
|
|
|
if (DRMP3_HDR_TEST_MPEG1(hdr))
|
|
{
|
|
gr_count *= 2;
|
|
main_data_begin = drmp3_bs_get_bits(bs, 9);
|
|
scfsi = drmp3_bs_get_bits(bs, 7 + gr_count);
|
|
} else
|
|
{
|
|
main_data_begin = drmp3_bs_get_bits(bs, 8 + gr_count) >> gr_count;
|
|
}
|
|
|
|
do
|
|
{
|
|
if (DRMP3_HDR_IS_MONO(hdr))
|
|
{
|
|
scfsi <<= 4;
|
|
}
|
|
gr->part_23_length = (drmp3_uint16)drmp3_bs_get_bits(bs, 12);
|
|
part_23_sum += gr->part_23_length;
|
|
gr->big_values = (drmp3_uint16)drmp3_bs_get_bits(bs, 9);
|
|
if (gr->big_values > 288)
|
|
{
|
|
return -1;
|
|
}
|
|
gr->global_gain = (drmp3_uint8)drmp3_bs_get_bits(bs, 8);
|
|
gr->scalefac_compress = (drmp3_uint16)drmp3_bs_get_bits(bs, DRMP3_HDR_TEST_MPEG1(hdr) ? 4 : 9);
|
|
gr->sfbtab = g_scf_long[sr_idx];
|
|
gr->n_long_sfb = 22;
|
|
gr->n_short_sfb = 0;
|
|
if (drmp3_bs_get_bits(bs, 1))
|
|
{
|
|
gr->block_type = (drmp3_uint8)drmp3_bs_get_bits(bs, 2);
|
|
if (!gr->block_type)
|
|
{
|
|
return -1;
|
|
}
|
|
gr->mixed_block_flag = (drmp3_uint8)drmp3_bs_get_bits(bs, 1);
|
|
gr->region_count[0] = 7;
|
|
gr->region_count[1] = 255;
|
|
if (gr->block_type == DRMP3_SHORT_BLOCK_TYPE)
|
|
{
|
|
scfsi &= 0x0F0F;
|
|
if (!gr->mixed_block_flag)
|
|
{
|
|
gr->region_count[0] = 8;
|
|
gr->sfbtab = g_scf_short[sr_idx];
|
|
gr->n_long_sfb = 0;
|
|
gr->n_short_sfb = 39;
|
|
} else
|
|
{
|
|
gr->sfbtab = g_scf_mixed[sr_idx];
|
|
gr->n_long_sfb = DRMP3_HDR_TEST_MPEG1(hdr) ? 8 : 6;
|
|
gr->n_short_sfb = 30;
|
|
}
|
|
}
|
|
tables = drmp3_bs_get_bits(bs, 10);
|
|
tables <<= 5;
|
|
gr->subblock_gain[0] = (drmp3_uint8)drmp3_bs_get_bits(bs, 3);
|
|
gr->subblock_gain[1] = (drmp3_uint8)drmp3_bs_get_bits(bs, 3);
|
|
gr->subblock_gain[2] = (drmp3_uint8)drmp3_bs_get_bits(bs, 3);
|
|
} else
|
|
{
|
|
gr->block_type = 0;
|
|
gr->mixed_block_flag = 0;
|
|
tables = drmp3_bs_get_bits(bs, 15);
|
|
gr->region_count[0] = (drmp3_uint8)drmp3_bs_get_bits(bs, 4);
|
|
gr->region_count[1] = (drmp3_uint8)drmp3_bs_get_bits(bs, 3);
|
|
gr->region_count[2] = 255;
|
|
}
|
|
gr->table_select[0] = (drmp3_uint8)(tables >> 10);
|
|
gr->table_select[1] = (drmp3_uint8)((tables >> 5) & 31);
|
|
gr->table_select[2] = (drmp3_uint8)((tables) & 31);
|
|
gr->preflag = (drmp3_uint8)(DRMP3_HDR_TEST_MPEG1(hdr) ? drmp3_bs_get_bits(bs, 1) : (gr->scalefac_compress >= 500));
|
|
gr->scalefac_scale = (drmp3_uint8)drmp3_bs_get_bits(bs, 1);
|
|
gr->count1_table = (drmp3_uint8)drmp3_bs_get_bits(bs, 1);
|
|
gr->scfsi = (drmp3_uint8)((scfsi >> 12) & 15);
|
|
scfsi <<= 4;
|
|
gr++;
|
|
} while(--gr_count);
|
|
|
|
if (part_23_sum + bs->pos > bs->limit + main_data_begin*8)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
return main_data_begin;
|
|
}
|
|
|
|
static void drmp3_L3_read_scalefactors(drmp3_uint8 *scf, drmp3_uint8 *ist_pos, const drmp3_uint8 *scf_size, const drmp3_uint8 *scf_count, drmp3_bs *bitbuf, int scfsi)
|
|
{
|
|
int i, k;
|
|
for (i = 0; i < 4 && scf_count[i]; i++, scfsi *= 2)
|
|
{
|
|
int cnt = scf_count[i];
|
|
if (scfsi & 8)
|
|
{
|
|
memcpy(scf, ist_pos, cnt);
|
|
} else
|
|
{
|
|
int bits = scf_size[i];
|
|
if (!bits)
|
|
{
|
|
memset(scf, 0, cnt);
|
|
memset(ist_pos, 0, cnt);
|
|
} else
|
|
{
|
|
int max_scf = (scfsi < 0) ? (1 << bits) - 1 : -1;
|
|
for (k = 0; k < cnt; k++)
|
|
{
|
|
int s = drmp3_bs_get_bits(bitbuf, bits);
|
|
ist_pos[k] = (drmp3_uint8)(s == max_scf ? -1 : s);
|
|
scf[k] = (drmp3_uint8)s;
|
|
}
|
|
}
|
|
}
|
|
ist_pos += cnt;
|
|
scf += cnt;
|
|
}
|
|
scf[0] = scf[1] = scf[2] = 0;
|
|
}
|
|
|
|
static float drmp3_L3_ldexp_q2(float y, int exp_q2)
|
|
{
|
|
static const float g_expfrac[4] = { 9.31322575e-10f,7.83145814e-10f,6.58544508e-10f,5.53767716e-10f };
|
|
int e;
|
|
do
|
|
{
|
|
e = DRMP3_MIN(30*4, exp_q2);
|
|
y *= g_expfrac[e & 3]*(1 << 30 >> (e >> 2));
|
|
} while ((exp_q2 -= e) > 0);
|
|
return y;
|
|
}
|
|
|
|
static void drmp3_L3_decode_scalefactors(const drmp3_uint8 *hdr, drmp3_uint8 *ist_pos, drmp3_bs *bs, const drmp3_L3_gr_info *gr, float *scf, int ch)
|
|
{
|
|
static const drmp3_uint8 g_scf_partitions[3][28] = {
|
|
{ 6,5,5, 5,6,5,5,5,6,5, 7,3,11,10,0,0, 7, 7, 7,0, 6, 6,6,3, 8, 8,5,0 },
|
|
{ 8,9,6,12,6,9,9,9,6,9,12,6,15,18,0,0, 6,15,12,0, 6,12,9,6, 6,18,9,0 },
|
|
{ 9,9,6,12,9,9,9,9,9,9,12,6,18,18,0,0,12,12,12,0,12, 9,9,6,15,12,9,0 }
|
|
};
|
|
const drmp3_uint8 *scf_partition = g_scf_partitions[!!gr->n_short_sfb + !gr->n_long_sfb];
|
|
drmp3_uint8 scf_size[4], iscf[40];
|
|
int i, scf_shift = gr->scalefac_scale + 1, gain_exp, scfsi = gr->scfsi;
|
|
float gain;
|
|
|
|
if (DRMP3_HDR_TEST_MPEG1(hdr))
|
|
{
|
|
static const drmp3_uint8 g_scfc_decode[16] = { 0,1,2,3, 12,5,6,7, 9,10,11,13, 14,15,18,19 };
|
|
int part = g_scfc_decode[gr->scalefac_compress];
|
|
scf_size[1] = scf_size[0] = (drmp3_uint8)(part >> 2);
|
|
scf_size[3] = scf_size[2] = (drmp3_uint8)(part & 3);
|
|
} else
|
|
{
|
|
static const drmp3_uint8 g_mod[6*4] = { 5,5,4,4,5,5,4,1,4,3,1,1,5,6,6,1,4,4,4,1,4,3,1,1 };
|
|
int k, modprod, sfc, ist = DRMP3_HDR_TEST_I_STEREO(hdr) && ch;
|
|
sfc = gr->scalefac_compress >> ist;
|
|
for (k = ist*3*4; sfc >= 0; sfc -= modprod, k += 4)
|
|
{
|
|
for (modprod = 1, i = 3; i >= 0; i--)
|
|
{
|
|
scf_size[i] = (drmp3_uint8)(sfc / modprod % g_mod[k + i]);
|
|
modprod *= g_mod[k + i];
|
|
}
|
|
}
|
|
scf_partition += k;
|
|
scfsi = -16;
|
|
}
|
|
drmp3_L3_read_scalefactors(iscf, ist_pos, scf_size, scf_partition, bs, scfsi);
|
|
|
|
if (gr->n_short_sfb)
|
|
{
|
|
int sh = 3 - scf_shift;
|
|
for (i = 0; i < gr->n_short_sfb; i += 3)
|
|
{
|
|
iscf[gr->n_long_sfb + i + 0] += gr->subblock_gain[0] << sh;
|
|
iscf[gr->n_long_sfb + i + 1] += gr->subblock_gain[1] << sh;
|
|
iscf[gr->n_long_sfb + i + 2] += gr->subblock_gain[2] << sh;
|
|
}
|
|
} else if (gr->preflag)
|
|
{
|
|
static const drmp3_uint8 g_preamp[10] = { 1,1,1,1,2,2,3,3,3,2 };
|
|
for (i = 0; i < 10; i++)
|
|
{
|
|
iscf[11 + i] += g_preamp[i];
|
|
}
|
|
}
|
|
|
|
gain_exp = gr->global_gain + DRMP3_BITS_DEQUANTIZER_OUT*4 - 210 - (DRMP3_HDR_IS_MS_STEREO(hdr) ? 2 : 0);
|
|
gain = drmp3_L3_ldexp_q2(1 << (DRMP3_MAX_SCFI/4), DRMP3_MAX_SCFI - gain_exp);
|
|
for (i = 0; i < (int)(gr->n_long_sfb + gr->n_short_sfb); i++)
|
|
{
|
|
scf[i] = drmp3_L3_ldexp_q2(gain, iscf[i] << scf_shift);
|
|
}
|
|
}
|
|
|
|
static float drmp3_L3_pow_43(int x)
|
|
{
|
|
static const float g_pow43[129] = {
|
|
0,1,2.519842f,4.326749f,6.349604f,8.549880f,10.902724f,13.390518f,16.000000f,18.720754f,21.544347f,24.463781f,27.473142f,30.567351f,33.741992f,36.993181f,40.317474f,43.711787f,47.173345f,50.699631f,54.288352f,57.937408f,61.644865f,65.408941f,69.227979f,73.100443f,77.024898f,81.000000f,85.024491f,89.097188f,93.216975f,97.382800f,101.593667f,105.848633f,110.146801f,114.487321f,118.869381f,123.292209f,127.755065f,132.257246f,136.798076f,141.376907f,145.993119f,150.646117f,155.335327f,160.060199f,164.820202f,169.614826f,174.443577f,179.305980f,184.201575f,189.129918f,194.090580f,199.083145f,204.107210f,209.162385f,214.248292f,219.364564f,224.510845f,229.686789f,234.892058f,240.126328f,245.389280f,250.680604f,256.000000f,261.347174f,266.721841f,272.123723f,277.552547f,283.008049f,288.489971f,293.998060f,299.532071f,305.091761f,310.676898f,316.287249f,321.922592f,327.582707f,333.267377f,338.976394f,344.709550f,350.466646f,356.247482f,362.051866f,367.879608f,373.730522f,379.604427f,385.501143f,391.420496f,397.362314f,403.326427f,409.312672f,415.320884f,421.350905f,427.402579f,433.475750f,439.570269f,445.685987f,451.822757f,457.980436f,464.158883f,470.357960f,476.577530f,482.817459f,489.077615f,495.357868f,501.658090f,507.978156f,514.317941f,520.677324f,527.056184f,533.454404f,539.871867f,546.308458f,552.764065f,559.238575f,565.731879f,572.243870f,578.774440f,585.323483f,591.890898f,598.476581f,605.080431f,611.702349f,618.342238f,625.000000f,631.675540f,638.368763f,645.079578f
|
|
};
|
|
float frac;
|
|
int sign, mult = 256;
|
|
|
|
if (x < 129)
|
|
{
|
|
return g_pow43[x];
|
|
}
|
|
|
|
if (x < 1024)
|
|
{
|
|
mult = 16;
|
|
x <<= 3;
|
|
}
|
|
|
|
sign = 2*x & 64;
|
|
frac = (float)((x & 63) - sign) / ((x & ~63) + sign);
|
|
return g_pow43[(x + sign) >> 6]*(1.f + frac*((4.f/3) + frac*(2.f/9)))*mult;
|
|
}
|
|
|
|
static void drmp3_L3_huffman(float *dst, drmp3_bs *bs, const drmp3_L3_gr_info *gr_info, const float *scf, int layer3gr_limit)
|
|
{
|
|
static const float g_pow43_signed[32] = { 0,0,1,-1,2.519842f,-2.519842f,4.326749f,-4.326749f,6.349604f,-6.349604f,8.549880f,-8.549880f,10.902724f,-10.902724f,13.390518f,-13.390518f,16.000000f,-16.000000f,18.720754f,-18.720754f,21.544347f,-21.544347f,24.463781f,-24.463781f,27.473142f,-27.473142f,30.567351f,-30.567351f,33.741992f,-33.741992f,36.993181f,-36.993181f };
|
|
static const drmp3_int16 tab0[32] = { 0, };
|
|
static const drmp3_int16 tab1[] = { 785,785,785,785,784,784,784,784,513,513,513,513,513,513,513,513,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256 };
|
|
static const drmp3_int16 tab2[] = { -255,1313,1298,1282,785,785,785,785,784,784,784,784,769,769,769,769,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,290,288 };
|
|
static const drmp3_int16 tab3[] = { -255,1313,1298,1282,769,769,769,769,529,529,529,529,529,529,529,529,528,528,528,528,528,528,528,528,512,512,512,512,512,512,512,512,290,288 };
|
|
static const drmp3_int16 tab5[] = { -253,-318,-351,-367,785,785,785,785,784,784,784,784,769,769,769,769,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,819,818,547,547,275,275,275,275,561,560,515,546,289,274,288,258 };
|
|
static const drmp3_int16 tab6[] = { -254,-287,1329,1299,1314,1312,1057,1057,1042,1042,1026,1026,784,784,784,784,529,529,529,529,529,529,529,529,769,769,769,769,768,768,768,768,563,560,306,306,291,259 };
|
|
static const drmp3_int16 tab7[] = { -252,-413,-477,-542,1298,-575,1041,1041,784,784,784,784,769,769,769,769,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,-383,-399,1107,1092,1106,1061,849,849,789,789,1104,1091,773,773,1076,1075,341,340,325,309,834,804,577,577,532,532,516,516,832,818,803,816,561,561,531,531,515,546,289,289,288,258 };
|
|
static const drmp3_int16 tab8[] = { -252,-429,-493,-559,1057,1057,1042,1042,529,529,529,529,529,529,529,529,784,784,784,784,769,769,769,769,512,512,512,512,512,512,512,512,-382,1077,-415,1106,1061,1104,849,849,789,789,1091,1076,1029,1075,834,834,597,581,340,340,339,324,804,833,532,532,832,772,818,803,817,787,816,771,290,290,290,290,288,258 };
|
|
static const drmp3_int16 tab9[] = { -253,-349,-414,-447,-463,1329,1299,-479,1314,1312,1057,1057,1042,1042,1026,1026,785,785,785,785,784,784,784,784,769,769,769,769,768,768,768,768,-319,851,821,-335,836,850,805,849,341,340,325,336,533,533,579,579,564,564,773,832,578,548,563,516,321,276,306,291,304,259 };
|
|
static const drmp3_int16 tab10[] = { -251,-572,-733,-830,-863,-879,1041,1041,784,784,784,784,769,769,769,769,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,-511,-527,-543,1396,1351,1381,1366,1395,1335,1380,-559,1334,1138,1138,1063,1063,1350,1392,1031,1031,1062,1062,1364,1363,1120,1120,1333,1348,881,881,881,881,375,374,359,373,343,358,341,325,791,791,1123,1122,-703,1105,1045,-719,865,865,790,790,774,774,1104,1029,338,293,323,308,-799,-815,833,788,772,818,803,816,322,292,307,320,561,531,515,546,289,274,288,258 };
|
|
static const drmp3_int16 tab11[] = { -251,-525,-605,-685,-765,-831,-846,1298,1057,1057,1312,1282,785,785,785,785,784,784,784,784,769,769,769,769,512,512,512,512,512,512,512,512,1399,1398,1383,1367,1382,1396,1351,-511,1381,1366,1139,1139,1079,1079,1124,1124,1364,1349,1363,1333,882,882,882,882,807,807,807,807,1094,1094,1136,1136,373,341,535,535,881,775,867,822,774,-591,324,338,-671,849,550,550,866,864,609,609,293,336,534,534,789,835,773,-751,834,804,308,307,833,788,832,772,562,562,547,547,305,275,560,515,290,290 };
|
|
static const drmp3_int16 tab12[] = { -252,-397,-477,-557,-622,-653,-719,-735,-750,1329,1299,1314,1057,1057,1042,1042,1312,1282,1024,1024,785,785,785,785,784,784,784,784,769,769,769,769,-383,1127,1141,1111,1126,1140,1095,1110,869,869,883,883,1079,1109,882,882,375,374,807,868,838,881,791,-463,867,822,368,263,852,837,836,-543,610,610,550,550,352,336,534,534,865,774,851,821,850,805,593,533,579,564,773,832,578,578,548,548,577,577,307,276,306,291,516,560,259,259 };
|
|
static const drmp3_int16 tab13[] = { -250,-2107,-2507,-2764,-2909,-2974,-3007,-3023,1041,1041,1040,1040,769,769,769,769,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,-767,-1052,-1213,-1277,-1358,-1405,-1469,-1535,-1550,-1582,-1614,-1647,-1662,-1694,-1726,-1759,-1774,-1807,-1822,-1854,-1886,1565,-1919,-1935,-1951,-1967,1731,1730,1580,1717,-1983,1729,1564,-1999,1548,-2015,-2031,1715,1595,-2047,1714,-2063,1610,-2079,1609,-2095,1323,1323,1457,1457,1307,1307,1712,1547,1641,1700,1699,1594,1685,1625,1442,1442,1322,1322,-780,-973,-910,1279,1278,1277,1262,1276,1261,1275,1215,1260,1229,-959,974,974,989,989,-943,735,478,478,495,463,506,414,-1039,1003,958,1017,927,942,987,957,431,476,1272,1167,1228,-1183,1256,-1199,895,895,941,941,1242,1227,1212,1135,1014,1014,490,489,503,487,910,1013,985,925,863,894,970,955,1012,847,-1343,831,755,755,984,909,428,366,754,559,-1391,752,486,457,924,997,698,698,983,893,740,740,908,877,739,739,667,667,953,938,497,287,271,271,683,606,590,712,726,574,302,302,738,736,481,286,526,725,605,711,636,724,696,651,589,681,666,710,364,467,573,695,466,466,301,465,379,379,709,604,665,679,316,316,634,633,436,436,464,269,424,394,452,332,438,363,347,408,393,448,331,422,362,407,392,421,346,406,391,376,375,359,1441,1306,-2367,1290,-2383,1337,-2399,-2415,1426,1321,-2431,1411,1336,-2447,-2463,-2479,1169,1169,1049,1049,1424,1289,1412,1352,1319,-2495,1154,1154,1064,1064,1153,1153,416,390,360,404,403,389,344,374,373,343,358,372,327,357,342,311,356,326,1395,1394,1137,1137,1047,1047,1365,1392,1287,1379,1334,1364,1349,1378,1318,1363,792,792,792,792,1152,1152,1032,1032,1121,1121,1046,1046,1120,1120,1030,1030,-2895,1106,1061,1104,849,849,789,789,1091,1076,1029,1090,1060,1075,833,833,309,324,532,532,832,772,818,803,561,561,531,560,515,546,289,274,288,258 };
|
|
static const drmp3_int16 tab15[] = { -250,-1179,-1579,-1836,-1996,-2124,-2253,-2333,-2413,-2477,-2542,-2574,-2607,-2622,-2655,1314,1313,1298,1312,1282,785,785,785,785,1040,1040,1025,1025,768,768,768,768,-766,-798,-830,-862,-895,-911,-927,-943,-959,-975,-991,-1007,-1023,-1039,-1055,-1070,1724,1647,-1103,-1119,1631,1767,1662,1738,1708,1723,-1135,1780,1615,1779,1599,1677,1646,1778,1583,-1151,1777,1567,1737,1692,1765,1722,1707,1630,1751,1661,1764,1614,1736,1676,1763,1750,1645,1598,1721,1691,1762,1706,1582,1761,1566,-1167,1749,1629,767,766,751,765,494,494,735,764,719,749,734,763,447,447,748,718,477,506,431,491,446,476,461,505,415,430,475,445,504,399,460,489,414,503,383,474,429,459,502,502,746,752,488,398,501,473,413,472,486,271,480,270,-1439,-1455,1357,-1471,-1487,-1503,1341,1325,-1519,1489,1463,1403,1309,-1535,1372,1448,1418,1476,1356,1462,1387,-1551,1475,1340,1447,1402,1386,-1567,1068,1068,1474,1461,455,380,468,440,395,425,410,454,364,467,466,464,453,269,409,448,268,432,1371,1473,1432,1417,1308,1460,1355,1446,1459,1431,1083,1083,1401,1416,1458,1445,1067,1067,1370,1457,1051,1051,1291,1430,1385,1444,1354,1415,1400,1443,1082,1082,1173,1113,1186,1066,1185,1050,-1967,1158,1128,1172,1097,1171,1081,-1983,1157,1112,416,266,375,400,1170,1142,1127,1065,793,793,1169,1033,1156,1096,1141,1111,1155,1080,1126,1140,898,898,808,808,897,897,792,792,1095,1152,1032,1125,1110,1139,1079,1124,882,807,838,881,853,791,-2319,867,368,263,822,852,837,866,806,865,-2399,851,352,262,534,534,821,836,594,594,549,549,593,593,533,533,848,773,579,579,564,578,548,563,276,276,577,576,306,291,516,560,305,305,275,259 };
|
|
static const drmp3_int16 tab16[] = { -251,-892,-2058,-2620,-2828,-2957,-3023,-3039,1041,1041,1040,1040,769,769,769,769,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,-511,-527,-543,-559,1530,-575,-591,1528,1527,1407,1526,1391,1023,1023,1023,1023,1525,1375,1268,1268,1103,1103,1087,1087,1039,1039,1523,-604,815,815,815,815,510,495,509,479,508,463,507,447,431,505,415,399,-734,-782,1262,-815,1259,1244,-831,1258,1228,-847,-863,1196,-879,1253,987,987,748,-767,493,493,462,477,414,414,686,669,478,446,461,445,474,429,487,458,412,471,1266,1264,1009,1009,799,799,-1019,-1276,-1452,-1581,-1677,-1757,-1821,-1886,-1933,-1997,1257,1257,1483,1468,1512,1422,1497,1406,1467,1496,1421,1510,1134,1134,1225,1225,1466,1451,1374,1405,1252,1252,1358,1480,1164,1164,1251,1251,1238,1238,1389,1465,-1407,1054,1101,-1423,1207,-1439,830,830,1248,1038,1237,1117,1223,1148,1236,1208,411,426,395,410,379,269,1193,1222,1132,1235,1221,1116,976,976,1192,1162,1177,1220,1131,1191,963,963,-1647,961,780,-1663,558,558,994,993,437,408,393,407,829,978,813,797,947,-1743,721,721,377,392,844,950,828,890,706,706,812,859,796,960,948,843,934,874,571,571,-1919,690,555,689,421,346,539,539,944,779,918,873,932,842,903,888,570,570,931,917,674,674,-2575,1562,-2591,1609,-2607,1654,1322,1322,1441,1441,1696,1546,1683,1593,1669,1624,1426,1426,1321,1321,1639,1680,1425,1425,1305,1305,1545,1668,1608,1623,1667,1592,1638,1666,1320,1320,1652,1607,1409,1409,1304,1304,1288,1288,1664,1637,1395,1395,1335,1335,1622,1636,1394,1394,1319,1319,1606,1621,1392,1392,1137,1137,1137,1137,345,390,360,375,404,373,1047,-2751,-2767,-2783,1062,1121,1046,-2799,1077,-2815,1106,1061,789,789,1105,1104,263,355,310,340,325,354,352,262,339,324,1091,1076,1029,1090,1060,1075,833,833,788,788,1088,1028,818,818,803,803,561,561,531,531,816,771,546,546,289,274,288,258 };
|
|
static const drmp3_int16 tab24[] = { -253,-317,-381,-446,-478,-509,1279,1279,-811,-1179,-1451,-1756,-1900,-2028,-2189,-2253,-2333,-2414,-2445,-2511,-2526,1313,1298,-2559,1041,1041,1040,1040,1025,1025,1024,1024,1022,1007,1021,991,1020,975,1019,959,687,687,1018,1017,671,671,655,655,1016,1015,639,639,758,758,623,623,757,607,756,591,755,575,754,559,543,543,1009,783,-575,-621,-685,-749,496,-590,750,749,734,748,974,989,1003,958,988,973,1002,942,987,957,972,1001,926,986,941,971,956,1000,910,985,925,999,894,970,-1071,-1087,-1102,1390,-1135,1436,1509,1451,1374,-1151,1405,1358,1480,1420,-1167,1507,1494,1389,1342,1465,1435,1450,1326,1505,1310,1493,1373,1479,1404,1492,1464,1419,428,443,472,397,736,526,464,464,486,457,442,471,484,482,1357,1449,1434,1478,1388,1491,1341,1490,1325,1489,1463,1403,1309,1477,1372,1448,1418,1433,1476,1356,1462,1387,-1439,1475,1340,1447,1402,1474,1324,1461,1371,1473,269,448,1432,1417,1308,1460,-1711,1459,-1727,1441,1099,1099,1446,1386,1431,1401,-1743,1289,1083,1083,1160,1160,1458,1445,1067,1067,1370,1457,1307,1430,1129,1129,1098,1098,268,432,267,416,266,400,-1887,1144,1187,1082,1173,1113,1186,1066,1050,1158,1128,1143,1172,1097,1171,1081,420,391,1157,1112,1170,1142,1127,1065,1169,1049,1156,1096,1141,1111,1155,1080,1126,1154,1064,1153,1140,1095,1048,-2159,1125,1110,1137,-2175,823,823,1139,1138,807,807,384,264,368,263,868,838,853,791,867,822,852,837,866,806,865,790,-2319,851,821,836,352,262,850,805,849,-2399,533,533,835,820,336,261,578,548,563,577,532,532,832,772,562,562,547,547,305,275,560,515,290,290,288,258 };
|
|
static const drmp3_uint8 tab32[] = { 130,162,193,209,44,28,76,140,9,9,9,9,9,9,9,9,190,254,222,238,126,94,157,157,109,61,173,205};
|
|
static const drmp3_uint8 tab33[] = { 252,236,220,204,188,172,156,140,124,108,92,76,60,44,28,12 };
|
|
static const drmp3_int16 * const tabindex[2*16] = { tab0,tab1,tab2,tab3,tab0,tab5,tab6,tab7,tab8,tab9,tab10,tab11,tab12,tab13,tab0,tab15,tab16,tab16,tab16,tab16,tab16,tab16,tab16,tab16,tab24,tab24,tab24,tab24,tab24,tab24,tab24,tab24 };
|
|
static const drmp3_uint8 g_linbits[] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,3,4,6,8,10,13,4,5,6,7,8,9,11,13 };
|
|
|
|
#define DRMP3_PEEK_BITS(n) (bs_cache >> (32 - n))
|
|
#define DRMP3_FLUSH_BITS(n) { bs_cache <<= (n); bs_sh += (n); }
|
|
#define DRMP3_CHECK_BITS while (bs_sh >= 0) { bs_cache |= (drmp3_uint32)*bs_next_ptr++ << bs_sh; bs_sh -= 8; }
|
|
#define DRMP3_BSPOS ((bs_next_ptr - bs->buf)*8 - 24 + bs_sh)
|
|
|
|
float one = 0.0f;
|
|
int ireg = 0, big_val_cnt = gr_info->big_values;
|
|
const drmp3_uint8 *sfb = gr_info->sfbtab;
|
|
const drmp3_uint8 *bs_next_ptr = bs->buf + bs->pos/8;
|
|
drmp3_uint32 bs_cache = (((bs_next_ptr[0]*256u + bs_next_ptr[1])*256u + bs_next_ptr[2])*256u + bs_next_ptr[3]) << (bs->pos & 7);
|
|
int pairs_to_decode, np, bs_sh = (bs->pos & 7) - 8;
|
|
bs_next_ptr += 4;
|
|
|
|
while (big_val_cnt > 0)
|
|
{
|
|
int tab_num = gr_info->table_select[ireg];
|
|
int sfb_cnt = gr_info->region_count[ireg++];
|
|
const short *codebook = tabindex[tab_num];
|
|
int linbits = g_linbits[tab_num];
|
|
do
|
|
{
|
|
np = *sfb++ / 2;
|
|
pairs_to_decode = DRMP3_MIN(big_val_cnt, np);
|
|
one = *scf++;
|
|
do
|
|
{
|
|
int j, w = 5;
|
|
int leaf = codebook[DRMP3_PEEK_BITS(w)];
|
|
while (leaf < 0)
|
|
{
|
|
DRMP3_FLUSH_BITS(w);
|
|
w = leaf & 7;
|
|
leaf = codebook[DRMP3_PEEK_BITS(w) - (leaf >> 3)];
|
|
}
|
|
DRMP3_FLUSH_BITS(leaf >> 8);
|
|
|
|
for (j = 0; j < 2; j++, dst++, leaf >>= 4)
|
|
{
|
|
int lsb = leaf & 0x0F;
|
|
if (lsb == 15 && linbits)
|
|
{
|
|
lsb += DRMP3_PEEK_BITS(linbits);
|
|
DRMP3_FLUSH_BITS(linbits);
|
|
DRMP3_CHECK_BITS;
|
|
*dst = one*drmp3_L3_pow_43(lsb)*((int32_t)bs_cache < 0 ? -1: 1);
|
|
} else
|
|
{
|
|
*dst = g_pow43_signed[lsb*2 + (bs_cache >> 31)]*one;
|
|
}
|
|
DRMP3_FLUSH_BITS(lsb ? 1 : 0);
|
|
}
|
|
DRMP3_CHECK_BITS;
|
|
} while (--pairs_to_decode);
|
|
} while ((big_val_cnt -= np) > 0 && --sfb_cnt >= 0);
|
|
}
|
|
|
|
for (np = 1 - big_val_cnt;; dst += 4)
|
|
{
|
|
const drmp3_uint8 *codebook_count1 = (gr_info->count1_table) ? tab33 : tab32;
|
|
int leaf = codebook_count1[DRMP3_PEEK_BITS(4)];
|
|
if (!(leaf & 8))
|
|
{
|
|
leaf = codebook_count1[(leaf >> 3) + (bs_cache << 4 >> (32 - (leaf & 3)))];
|
|
}
|
|
DRMP3_FLUSH_BITS(leaf & 7);
|
|
if (DRMP3_BSPOS > layer3gr_limit)
|
|
{
|
|
break;
|
|
}
|
|
#define DRMP3_RELOAD_SCALEFACTOR if (!--np) { np = *sfb++/2; if (!np) break; one = *scf++; }
|
|
#define DRMP3_DEQ_COUNT1(s) if (leaf & (128 >> s)) { dst[s] = ((drmp3_int32)bs_cache < 0) ? -one : one; DRMP3_FLUSH_BITS(1) }
|
|
DRMP3_RELOAD_SCALEFACTOR;
|
|
DRMP3_DEQ_COUNT1(0);
|
|
DRMP3_DEQ_COUNT1(1);
|
|
DRMP3_RELOAD_SCALEFACTOR;
|
|
DRMP3_DEQ_COUNT1(2);
|
|
DRMP3_DEQ_COUNT1(3);
|
|
DRMP3_CHECK_BITS;
|
|
}
|
|
|
|
bs->pos = layer3gr_limit;
|
|
}
|
|
|
|
static void drmp3_L3_midside_stereo(float *left, int n)
|
|
{
|
|
int i = 0;
|
|
float *right = left + 576;
|
|
#if DRMP3_HAVE_SIMD
|
|
if (drmp3_have_simd()) for (; i < n - 3; i += 4)
|
|
{
|
|
drmp3_f4 vl = DRMP3_VLD(left + i);
|
|
drmp3_f4 vr = DRMP3_VLD(right + i);
|
|
DRMP3_VSTORE(left + i, DRMP3_VADD(vl, vr));
|
|
DRMP3_VSTORE(right + i, DRMP3_VSUB(vl, vr));
|
|
}
|
|
#endif
|
|
for (; i < n; i++)
|
|
{
|
|
float a = left[i];
|
|
float b = right[i];
|
|
left[i] = a + b;
|
|
right[i] = a - b;
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_intensity_stereo_band(float *left, int n, float kl, float kr)
|
|
{
|
|
int i;
|
|
for (i = 0; i < n; i++)
|
|
{
|
|
left[i + 576] = left[i]*kr;
|
|
left[i] = left[i]*kl;
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_stereo_top_band(const float *right, const drmp3_uint8 *sfb, int nbands, int max_band[3])
|
|
{
|
|
int i, k;
|
|
|
|
max_band[0] = max_band[1] = max_band[2] = -1;
|
|
|
|
for (i = 0; i < nbands; i++)
|
|
{
|
|
for (k = 0; k < sfb[i]; k += 2)
|
|
{
|
|
if (right[k] != 0 || right[k + 1] != 0)
|
|
{
|
|
max_band[i % 3] = i;
|
|
break;
|
|
}
|
|
}
|
|
right += sfb[i];
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_stereo_process(float *left, const drmp3_uint8 *ist_pos, const drmp3_uint8 *sfb, const drmp3_uint8 *hdr, int max_band[3], int mpeg2_sh)
|
|
{
|
|
static const float g_pan[7*2] = { 0,1,0.21132487f,0.78867513f,0.36602540f,0.63397460f,0.5f,0.5f,0.63397460f,0.36602540f,0.78867513f,0.21132487f,1,0 };
|
|
unsigned i, max_pos = DRMP3_HDR_TEST_MPEG1(hdr) ? 7 : 64;
|
|
|
|
for (i = 0; sfb[i]; i++)
|
|
{
|
|
unsigned ipos = ist_pos[i];
|
|
if ((int)i > max_band[i % 3] && ipos < max_pos)
|
|
{
|
|
float kl, kr, s = DRMP3_HDR_TEST_MS_STEREO(hdr) ? 1.41421356f : 1;
|
|
if (DRMP3_HDR_TEST_MPEG1(hdr))
|
|
{
|
|
kl = g_pan[2*ipos];
|
|
kr = g_pan[2*ipos + 1];
|
|
} else
|
|
{
|
|
kl = 1;
|
|
kr = drmp3_L3_ldexp_q2(1, (ipos + 1) >> 1 << mpeg2_sh);
|
|
if (ipos & 1)
|
|
{
|
|
kl = kr;
|
|
kr = 1;
|
|
}
|
|
}
|
|
drmp3_L3_intensity_stereo_band(left, sfb[i], kl*s, kr*s);
|
|
} else if (DRMP3_HDR_TEST_MS_STEREO(hdr))
|
|
{
|
|
drmp3_L3_midside_stereo(left, sfb[i]);
|
|
}
|
|
left += sfb[i];
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_intensity_stereo(float *left, drmp3_uint8 *ist_pos, const drmp3_L3_gr_info *gr, const drmp3_uint8 *hdr)
|
|
{
|
|
int max_band[3], n_sfb = gr->n_long_sfb + gr->n_short_sfb;
|
|
int i, max_blocks = gr->n_short_sfb ? 3 : 1;
|
|
|
|
drmp3_L3_stereo_top_band(left + 576, gr->sfbtab, n_sfb, max_band);
|
|
if (gr->n_long_sfb)
|
|
{
|
|
max_band[0] = max_band[1] = max_band[2] = DRMP3_MAX(DRMP3_MAX(max_band[0], max_band[1]), max_band[2]);
|
|
}
|
|
for (i = 0; i < max_blocks; i++)
|
|
{
|
|
int default_pos = DRMP3_HDR_TEST_MPEG1(hdr) ? 3 : 0;
|
|
int itop = n_sfb - max_blocks + i;
|
|
int prev = itop - max_blocks;
|
|
ist_pos[itop] = (drmp3_uint8)(max_band[i] >= prev ? default_pos : ist_pos[prev]);
|
|
}
|
|
drmp3_L3_stereo_process(left, ist_pos, gr->sfbtab, hdr, max_band, gr[1].scalefac_compress&1);
|
|
}
|
|
|
|
static void drmp3_L3_reorder(float *grbuf, float *scratch, const drmp3_uint8 *sfb)
|
|
{
|
|
int i, len;
|
|
float *src = grbuf, *dst = scratch;
|
|
|
|
for (;0 != (len = *sfb); sfb += 3, src += 2*len)
|
|
{
|
|
for (i = 0; i < len; i++, src++)
|
|
{
|
|
*dst++ = src[0*len];
|
|
*dst++ = src[1*len];
|
|
*dst++ = src[2*len];
|
|
}
|
|
}
|
|
memcpy(grbuf, scratch, (dst - scratch)*sizeof(float));
|
|
}
|
|
|
|
static void drmp3_L3_antialias(float *grbuf, int nbands)
|
|
{
|
|
static const float g_aa[2][8] = {
|
|
{0.85749293f,0.88174200f,0.94962865f,0.98331459f,0.99551782f,0.99916056f,0.99989920f,0.99999316f},
|
|
{0.51449576f,0.47173197f,0.31337745f,0.18191320f,0.09457419f,0.04096558f,0.01419856f,0.00369997f}
|
|
};
|
|
|
|
for (; nbands > 0; nbands--, grbuf += 18)
|
|
{
|
|
int i = 0;
|
|
#if DRMP3_HAVE_SIMD
|
|
if (drmp3_have_simd()) for (; i < 8; i += 4)
|
|
{
|
|
drmp3_f4 vu = DRMP3_VLD(grbuf + 18 + i);
|
|
drmp3_f4 vd = DRMP3_VLD(grbuf + 14 - i);
|
|
drmp3_f4 vc0 = DRMP3_VLD(g_aa[0] + i);
|
|
drmp3_f4 vc1 = DRMP3_VLD(g_aa[1] + i);
|
|
vd = DRMP3_VREV(vd);
|
|
DRMP3_VSTORE(grbuf + 18 + i, DRMP3_VSUB(DRMP3_VMUL(vu, vc0), DRMP3_VMUL(vd, vc1)));
|
|
vd = DRMP3_VADD(DRMP3_VMUL(vu, vc1), DRMP3_VMUL(vd, vc0));
|
|
DRMP3_VSTORE(grbuf + 14 - i, DRMP3_VREV(vd));
|
|
}
|
|
#endif
|
|
#ifndef DR_MP3_ONLY_SIMD
|
|
for(; i < 8; i++)
|
|
{
|
|
float u = grbuf[18 + i];
|
|
float d = grbuf[17 - i];
|
|
grbuf[18 + i] = u*g_aa[0][i] - d*g_aa[1][i];
|
|
grbuf[17 - i] = u*g_aa[1][i] + d*g_aa[0][i];
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_dct3_9(float *y)
|
|
{
|
|
float s0, s1, s2, s3, s4, s5, s6, s7, s8, t0, t2, t4;
|
|
|
|
s0 = y[0]; s2 = y[2]; s4 = y[4]; s6 = y[6]; s8 = y[8];
|
|
t0 = s0 + s6*0.5f;
|
|
s0 -= s6;
|
|
t4 = (s4 + s2)*0.93969262f;
|
|
t2 = (s8 + s2)*0.76604444f;
|
|
s6 = (s4 - s8)*0.17364818f;
|
|
s4 += s8 - s2;
|
|
|
|
s2 = s0 - s4*0.5f;
|
|
y[4] = s4 + s0;
|
|
s8 = t0 - t2 + s6;
|
|
s0 = t0 - t4 + t2;
|
|
s4 = t0 + t4 - s6;
|
|
|
|
s1 = y[1]; s3 = y[3]; s5 = y[5]; s7 = y[7];
|
|
|
|
s3 *= 0.86602540f;
|
|
t0 = (s5 + s1)*0.98480775f;
|
|
t4 = (s5 - s7)*0.34202014f;
|
|
t2 = (s1 + s7)*0.64278761f;
|
|
s1 = (s1 - s5 - s7)*0.86602540f;
|
|
|
|
s5 = t0 - s3 - t2;
|
|
s7 = t4 - s3 - t0;
|
|
s3 = t4 + s3 - t2;
|
|
|
|
y[0] = s4 - s7;
|
|
y[1] = s2 + s1;
|
|
y[2] = s0 - s3;
|
|
y[3] = s8 + s5;
|
|
y[5] = s8 - s5;
|
|
y[6] = s0 + s3;
|
|
y[7] = s2 - s1;
|
|
y[8] = s4 + s7;
|
|
}
|
|
|
|
static void drmp3_L3_imdct36(float *grbuf, float *overlap, const float *window, int nbands)
|
|
{
|
|
int i, j;
|
|
static const float g_twid9[18] = {
|
|
0.73727734f,0.79335334f,0.84339145f,0.88701083f,0.92387953f,0.95371695f,0.97629601f,0.99144486f,0.99904822f,0.67559021f,0.60876143f,0.53729961f,0.46174861f,0.38268343f,0.30070580f,0.21643961f,0.13052619f,0.04361938f
|
|
};
|
|
|
|
for (j = 0; j < nbands; j++, grbuf += 18, overlap += 9)
|
|
{
|
|
float co[9], si[9];
|
|
co[0] = -grbuf[0];
|
|
si[0] = grbuf[17];
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
si[8 - 2*i] = grbuf[4*i + 1] - grbuf[4*i + 2];
|
|
co[1 + 2*i] = grbuf[4*i + 1] + grbuf[4*i + 2];
|
|
si[7 - 2*i] = grbuf[4*i + 4] - grbuf[4*i + 3];
|
|
co[2 + 2*i] = -(grbuf[4*i + 3] + grbuf[4*i + 4]);
|
|
}
|
|
drmp3_L3_dct3_9(co);
|
|
drmp3_L3_dct3_9(si);
|
|
|
|
si[1] = -si[1];
|
|
si[3] = -si[3];
|
|
si[5] = -si[5];
|
|
si[7] = -si[7];
|
|
|
|
i = 0;
|
|
|
|
#if DRMP3_HAVE_SIMD
|
|
if (drmp3_have_simd()) for (; i < 8; i += 4)
|
|
{
|
|
drmp3_f4 vovl = DRMP3_VLD(overlap + i);
|
|
drmp3_f4 vc = DRMP3_VLD(co + i);
|
|
drmp3_f4 vs = DRMP3_VLD(si + i);
|
|
drmp3_f4 vr0 = DRMP3_VLD(g_twid9 + i);
|
|
drmp3_f4 vr1 = DRMP3_VLD(g_twid9 + 9 + i);
|
|
drmp3_f4 vw0 = DRMP3_VLD(window + i);
|
|
drmp3_f4 vw1 = DRMP3_VLD(window + 9 + i);
|
|
drmp3_f4 vsum = DRMP3_VADD(DRMP3_VMUL(vc, vr1), DRMP3_VMUL(vs, vr0));
|
|
DRMP3_VSTORE(overlap + i, DRMP3_VSUB(DRMP3_VMUL(vc, vr0), DRMP3_VMUL(vs, vr1)));
|
|
DRMP3_VSTORE(grbuf + i, DRMP3_VSUB(DRMP3_VMUL(vovl, vw0), DRMP3_VMUL(vsum, vw1)));
|
|
vsum = DRMP3_VADD(DRMP3_VMUL(vovl, vw1), DRMP3_VMUL(vsum, vw0));
|
|
DRMP3_VSTORE(grbuf + 14 - i, DRMP3_VREV(vsum));
|
|
}
|
|
#endif
|
|
for (; i < 9; i++)
|
|
{
|
|
float ovl = overlap[i];
|
|
float sum = co[i]*g_twid9[9 + i] + si[i]*g_twid9[0 + i];
|
|
overlap[i] = co[i]*g_twid9[0 + i] - si[i]*g_twid9[9 + i];
|
|
grbuf[i] = ovl*window[0 + i] - sum*window[9 + i];
|
|
grbuf[17 - i] = ovl*window[9 + i] + sum*window[0 + i];
|
|
}
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_idct3(float x0, float x1, float x2, float *dst)
|
|
{
|
|
float m1 = x1*0.86602540f;
|
|
float a1 = x0 - x2*0.5f;
|
|
dst[1] = x0 + x2;
|
|
dst[0] = a1 + m1;
|
|
dst[2] = a1 - m1;
|
|
}
|
|
|
|
static void drmp3_L3_imdct12(float *x, float *dst, float *overlap)
|
|
{
|
|
static const float g_twid3[6] = { 0.79335334f,0.92387953f,0.99144486f, 0.60876143f,0.38268343f,0.13052619f };
|
|
float co[3], si[3];
|
|
int i;
|
|
|
|
drmp3_L3_idct3(-x[0], x[6] + x[3], x[12] + x[9], co);
|
|
drmp3_L3_idct3(x[15], x[12] - x[9], x[6] - x[3], si);
|
|
si[1] = -si[1];
|
|
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
float ovl = overlap[i];
|
|
float sum = co[i]*g_twid3[3 + i] + si[i]*g_twid3[0 + i];
|
|
overlap[i] = co[i]*g_twid3[0 + i] - si[i]*g_twid3[3 + i];
|
|
dst[i] = ovl*g_twid3[2 - i] - sum*g_twid3[5 - i];
|
|
dst[5 - i] = ovl*g_twid3[5 - i] + sum*g_twid3[2 - i];
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_imdct_short(float *grbuf, float *overlap, int nbands)
|
|
{
|
|
for (;nbands > 0; nbands--, overlap += 9, grbuf += 18)
|
|
{
|
|
float tmp[18];
|
|
memcpy(tmp, grbuf, sizeof(tmp));
|
|
memcpy(grbuf, overlap, 6*sizeof(float));
|
|
drmp3_L3_imdct12(tmp, grbuf + 6, overlap + 6);
|
|
drmp3_L3_imdct12(tmp + 1, grbuf + 12, overlap + 6);
|
|
drmp3_L3_imdct12(tmp + 2, overlap, overlap + 6);
|
|
}
|
|
}
|
|
|
|
static void drmp3_L3_change_sign(float *grbuf)
|
|
{
|
|
int b, i;
|
|
for (b = 0, grbuf += 18; b < 32; b += 2, grbuf += 36)
|
|
for (i = 1; i < 18; i += 2)
|
|
grbuf[i] = -grbuf[i];
|
|
}
|
|
|
|
static void drmp3_L3_imdct_gr(float *grbuf, float *overlap, unsigned block_type, unsigned n_long_bands)
|
|
{
|
|
static const float g_mdct_window[2][18] = {
|
|
{ 0.99904822f,0.99144486f,0.97629601f,0.95371695f,0.92387953f,0.88701083f,0.84339145f,0.79335334f,0.73727734f,0.04361938f,0.13052619f,0.21643961f,0.30070580f,0.38268343f,0.46174861f,0.53729961f,0.60876143f,0.67559021f },
|
|
{ 1,1,1,1,1,1,0.99144486f,0.92387953f,0.79335334f,0,0,0,0,0,0,0.13052619f,0.38268343f,0.60876143f }
|
|
};
|
|
if (n_long_bands)
|
|
{
|
|
drmp3_L3_imdct36(grbuf, overlap, g_mdct_window[0], n_long_bands);
|
|
grbuf += 18*n_long_bands;
|
|
overlap += 9*n_long_bands;
|
|
}
|
|
if (block_type == DRMP3_SHORT_BLOCK_TYPE)
|
|
drmp3_L3_imdct_short(grbuf, overlap, 32 - n_long_bands);
|
|
else
|
|
drmp3_L3_imdct36(grbuf, overlap, g_mdct_window[block_type == DRMP3_STOP_BLOCK_TYPE], 32 - n_long_bands);
|
|
}
|
|
|
|
static void drmp3_L3_save_reservoir(drmp3dec *h, drmp3dec_scratch *s)
|
|
{
|
|
int pos = (s->bs.pos + 7)/8u;
|
|
int remains = s->bs.limit/8u - pos;
|
|
if (remains > DRMP3_MAX_BITRESERVOIR_BYTES)
|
|
{
|
|
pos += remains - DRMP3_MAX_BITRESERVOIR_BYTES;
|
|
remains = DRMP3_MAX_BITRESERVOIR_BYTES;
|
|
}
|
|
if (remains > 0)
|
|
{
|
|
memmove(h->reserv_buf, s->maindata + pos, remains);
|
|
}
|
|
h->reserv = remains;
|
|
}
|
|
|
|
static int drmp3_L3_restore_reservoir(drmp3dec *h, drmp3_bs *bs, drmp3dec_scratch *s, int main_data_begin)
|
|
{
|
|
int frame_bytes = (bs->limit - bs->pos)/8;
|
|
int bytes_have = DRMP3_MIN(h->reserv, main_data_begin);
|
|
memcpy(s->maindata, h->reserv_buf + DRMP3_MAX(0, h->reserv - main_data_begin), DRMP3_MIN(h->reserv, main_data_begin));
|
|
memcpy(s->maindata + bytes_have, bs->buf + bs->pos/8, frame_bytes);
|
|
drmp3_bs_init(&s->bs, s->maindata, bytes_have + frame_bytes);
|
|
return h->reserv >= main_data_begin;
|
|
}
|
|
|
|
static void drmp3_L3_decode(drmp3dec *h, drmp3dec_scratch *s, drmp3_L3_gr_info *gr_info, int nch)
|
|
{
|
|
int ch;
|
|
|
|
for (ch = 0; ch < nch; ch++)
|
|
{
|
|
int layer3gr_limit = s->bs.pos + gr_info[ch].part_23_length;
|
|
drmp3_L3_decode_scalefactors(h->header, s->ist_pos[ch], &s->bs, gr_info + ch, s->scf, ch);
|
|
drmp3_L3_huffman(s->grbuf[ch], &s->bs, gr_info + ch, s->scf, layer3gr_limit);
|
|
}
|
|
|
|
if (DRMP3_HDR_TEST_I_STEREO(h->header))
|
|
{
|
|
drmp3_L3_intensity_stereo(s->grbuf[0], s->ist_pos[1], gr_info, h->header);
|
|
} else if (DRMP3_HDR_IS_MS_STEREO(h->header))
|
|
{
|
|
drmp3_L3_midside_stereo(s->grbuf[0], 576);
|
|
}
|
|
|
|
for (ch = 0; ch < nch; ch++, gr_info++)
|
|
{
|
|
int aa_bands = 31;
|
|
int n_long_bands = (gr_info->mixed_block_flag ? 2 : 0) << (int)(DRMP3_HDR_GET_MY_SAMPLE_RATE(h->header) == 2);
|
|
|
|
if (gr_info->n_short_sfb)
|
|
{
|
|
aa_bands = n_long_bands - 1;
|
|
drmp3_L3_reorder(s->grbuf[ch] + n_long_bands*18, s->syn[0], gr_info->sfbtab + gr_info->n_long_sfb);
|
|
}
|
|
|
|
drmp3_L3_antialias(s->grbuf[ch], aa_bands);
|
|
drmp3_L3_imdct_gr(s->grbuf[ch], h->mdct_overlap[ch], gr_info->block_type, n_long_bands);
|
|
drmp3_L3_change_sign(s->grbuf[ch]);
|
|
}
|
|
}
|
|
|
|
static void drmp3d_DCT_II(float *grbuf, int n)
|
|
{
|
|
static const float g_sec[24] = {
|
|
10.19000816f,0.50060302f,0.50241929f,3.40760851f,0.50547093f,0.52249861f,2.05778098f,0.51544732f,0.56694406f,1.48416460f,0.53104258f,0.64682180f,1.16943991f,0.55310392f,0.78815460f,0.97256821f,0.58293498f,1.06067765f,0.83934963f,0.62250412f,1.72244716f,0.74453628f,0.67480832f,5.10114861f
|
|
};
|
|
int i, k = 0;
|
|
#if DRMP3_HAVE_SIMD
|
|
if (drmp3_have_simd()) for (; k < n; k += 4)
|
|
{
|
|
drmp3_f4 t[4][8], *x;
|
|
float *y = grbuf + k;
|
|
|
|
for (x = t[0], i = 0; i < 8; i++, x++)
|
|
{
|
|
drmp3_f4 x0 = DRMP3_VLD(&y[i*18]);
|
|
drmp3_f4 x1 = DRMP3_VLD(&y[(15 - i)*18]);
|
|
drmp3_f4 x2 = DRMP3_VLD(&y[(16 + i)*18]);
|
|
drmp3_f4 x3 = DRMP3_VLD(&y[(31 - i)*18]);
|
|
drmp3_f4 t0 = DRMP3_VADD(x0, x3);
|
|
drmp3_f4 t1 = DRMP3_VADD(x1, x2);
|
|
drmp3_f4 t2 = DRMP3_VMUL_S(DRMP3_VSUB(x1, x2), g_sec[3*i + 0]);
|
|
drmp3_f4 t3 = DRMP3_VMUL_S(DRMP3_VSUB(x0, x3), g_sec[3*i + 1]);
|
|
x[0] = DRMP3_VADD(t0, t1);
|
|
x[8] = DRMP3_VMUL_S(DRMP3_VSUB(t0, t1), g_sec[3*i + 2]);
|
|
x[16] = DRMP3_VADD(t3, t2);
|
|
x[24] = DRMP3_VMUL_S(DRMP3_VSUB(t3, t2), g_sec[3*i + 2]);
|
|
}
|
|
for (x = t[0], i = 0; i < 4; i++, x += 8)
|
|
{
|
|
drmp3_f4 x0 = x[0], x1 = x[1], x2 = x[2], x3 = x[3], x4 = x[4], x5 = x[5], x6 = x[6], x7 = x[7], xt;
|
|
xt = DRMP3_VSUB(x0, x7); x0 = DRMP3_VADD(x0, x7);
|
|
x7 = DRMP3_VSUB(x1, x6); x1 = DRMP3_VADD(x1, x6);
|
|
x6 = DRMP3_VSUB(x2, x5); x2 = DRMP3_VADD(x2, x5);
|
|
x5 = DRMP3_VSUB(x3, x4); x3 = DRMP3_VADD(x3, x4);
|
|
x4 = DRMP3_VSUB(x0, x3); x0 = DRMP3_VADD(x0, x3);
|
|
x3 = DRMP3_VSUB(x1, x2); x1 = DRMP3_VADD(x1, x2);
|
|
x[0] = DRMP3_VADD(x0, x1);
|
|
x[4] = DRMP3_VMUL_S(DRMP3_VSUB(x0, x1), 0.70710677f);
|
|
x5 = DRMP3_VADD(x5, x6);
|
|
x6 = DRMP3_VMUL_S(DRMP3_VADD(x6, x7), 0.70710677f);
|
|
x7 = DRMP3_VADD(x7, xt);
|
|
x3 = DRMP3_VMUL_S(DRMP3_VADD(x3, x4), 0.70710677f);
|
|
x5 = DRMP3_VSUB(x5, DRMP3_VMUL_S(x7, 0.198912367f)); /* rotate by PI/8 */
|
|
x7 = DRMP3_VADD(x7, DRMP3_VMUL_S(x5, 0.382683432f));
|
|
x5 = DRMP3_VSUB(x5, DRMP3_VMUL_S(x7, 0.198912367f));
|
|
x0 = DRMP3_VSUB(xt, x6); xt = DRMP3_VADD(xt, x6);
|
|
x[1] = DRMP3_VMUL_S(DRMP3_VADD(xt, x7), 0.50979561f);
|
|
x[2] = DRMP3_VMUL_S(DRMP3_VADD(x4, x3), 0.54119611f);
|
|
x[3] = DRMP3_VMUL_S(DRMP3_VSUB(x0, x5), 0.60134488f);
|
|
x[5] = DRMP3_VMUL_S(DRMP3_VADD(x0, x5), 0.89997619f);
|
|
x[6] = DRMP3_VMUL_S(DRMP3_VSUB(x4, x3), 1.30656302f);
|
|
x[7] = DRMP3_VMUL_S(DRMP3_VSUB(xt, x7), 2.56291556f);
|
|
}
|
|
|
|
if (k > n - 3)
|
|
{
|
|
#if DRMP3_HAVE_SSE
|
|
#define DRMP3_VSAVE2(i, v) _mm_storel_pi((__m64 *)(void*)&y[i*18], v)
|
|
#else
|
|
#define DRMP3_VSAVE2(i, v) vst1_f32((float32_t *)&y[i*18], vget_low_f32(v))
|
|
#endif
|
|
for (i = 0; i < 7; i++, y += 4*18)
|
|
{
|
|
drmp3_f4 s = DRMP3_VADD(t[3][i], t[3][i + 1]);
|
|
DRMP3_VSAVE2(0, t[0][i]);
|
|
DRMP3_VSAVE2(1, DRMP3_VADD(t[2][i], s));
|
|
DRMP3_VSAVE2(2, DRMP3_VADD(t[1][i], t[1][i + 1]));
|
|
DRMP3_VSAVE2(3, DRMP3_VADD(t[2][1 + i], s));
|
|
}
|
|
DRMP3_VSAVE2(0, t[0][7]);
|
|
DRMP3_VSAVE2(1, DRMP3_VADD(t[2][7], t[3][7]));
|
|
DRMP3_VSAVE2(2, t[1][7]);
|
|
DRMP3_VSAVE2(3, t[3][7]);
|
|
} else
|
|
{
|
|
#define DRMP3_VSAVE4(i, v) DRMP3_VSTORE(&y[i*18], v)
|
|
for (i = 0; i < 7; i++, y += 4*18)
|
|
{
|
|
drmp3_f4 s = DRMP3_VADD(t[3][i], t[3][i + 1]);
|
|
DRMP3_VSAVE4(0, t[0][i]);
|
|
DRMP3_VSAVE4(1, DRMP3_VADD(t[2][i], s));
|
|
DRMP3_VSAVE4(2, DRMP3_VADD(t[1][i], t[1][i + 1]));
|
|
DRMP3_VSAVE4(3, DRMP3_VADD(t[2][1 + i], s));
|
|
}
|
|
DRMP3_VSAVE4(0, t[0][7]);
|
|
DRMP3_VSAVE4(1, DRMP3_VADD(t[2][7], t[3][7]));
|
|
DRMP3_VSAVE4(2, t[1][7]);
|
|
DRMP3_VSAVE4(3, t[3][7]);
|
|
}
|
|
} else
|
|
#endif
|
|
#ifdef DR_MP3_ONLY_SIMD
|
|
{}
|
|
#else
|
|
for (; k < n; k++)
|
|
{
|
|
float t[4][8], *x, *y = grbuf + k;
|
|
|
|
for (x = t[0], i = 0; i < 8; i++, x++)
|
|
{
|
|
float x0 = y[i*18];
|
|
float x1 = y[(15 - i)*18];
|
|
float x2 = y[(16 + i)*18];
|
|
float x3 = y[(31 - i)*18];
|
|
float t0 = x0 + x3;
|
|
float t1 = x1 + x2;
|
|
float t2 = (x1 - x2)*g_sec[3*i + 0];
|
|
float t3 = (x0 - x3)*g_sec[3*i + 1];
|
|
x[0] = t0 + t1;
|
|
x[8] = (t0 - t1)*g_sec[3*i + 2];
|
|
x[16] = t3 + t2;
|
|
x[24] = (t3 - t2)*g_sec[3*i + 2];
|
|
}
|
|
for (x = t[0], i = 0; i < 4; i++, x += 8)
|
|
{
|
|
float x0 = x[0], x1 = x[1], x2 = x[2], x3 = x[3], x4 = x[4], x5 = x[5], x6 = x[6], x7 = x[7], xt;
|
|
xt = x0 - x7; x0 += x7;
|
|
x7 = x1 - x6; x1 += x6;
|
|
x6 = x2 - x5; x2 += x5;
|
|
x5 = x3 - x4; x3 += x4;
|
|
x4 = x0 - x3; x0 += x3;
|
|
x3 = x1 - x2; x1 += x2;
|
|
x[0] = x0 + x1;
|
|
x[4] = (x0 - x1)*0.70710677f;
|
|
x5 = x5 + x6;
|
|
x6 = (x6 + x7)*0.70710677f;
|
|
x7 = x7 + xt;
|
|
x3 = (x3 + x4)*0.70710677f;
|
|
x5 -= x7*0.198912367f; /* rotate by PI/8 */
|
|
x7 += x5*0.382683432f;
|
|
x5 -= x7*0.198912367f;
|
|
x0 = xt - x6; xt += x6;
|
|
x[1] = (xt + x7)*0.50979561f;
|
|
x[2] = (x4 + x3)*0.54119611f;
|
|
x[3] = (x0 - x5)*0.60134488f;
|
|
x[5] = (x0 + x5)*0.89997619f;
|
|
x[6] = (x4 - x3)*1.30656302f;
|
|
x[7] = (xt - x7)*2.56291556f;
|
|
|
|
}
|
|
for (i = 0; i < 7; i++, y += 4*18)
|
|
{
|
|
y[0*18] = t[0][i];
|
|
y[1*18] = t[2][i] + t[3][i] + t[3][i + 1];
|
|
y[2*18] = t[1][i] + t[1][i + 1];
|
|
y[3*18] = t[2][i + 1] + t[3][i] + t[3][i + 1];
|
|
}
|
|
y[0*18] = t[0][7];
|
|
y[1*18] = t[2][7] + t[3][7];
|
|
y[2*18] = t[1][7];
|
|
y[3*18] = t[3][7];
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static short drmp3d_scale_pcm(float sample)
|
|
{
|
|
int s;
|
|
if (sample > 32767.0) return (short) 32767;
|
|
if (sample < -32768.0) return (short)-32768;
|
|
s = (int)(sample + .5f);
|
|
s -= (s < 0); /* away from zero, to be compliant */
|
|
if (s > 32767) return (short) 32767;
|
|
if (s < -32768) return (short)-32768;
|
|
return (short)s;
|
|
}
|
|
|
|
static void drmp3d_synth_pair(short *pcm, int nch, const float *z)
|
|
{
|
|
float a;
|
|
a = (z[14*64] - z[ 0]) * 29;
|
|
a += (z[ 1*64] + z[13*64]) * 213;
|
|
a += (z[12*64] - z[ 2*64]) * 459;
|
|
a += (z[ 3*64] + z[11*64]) * 2037;
|
|
a += (z[10*64] - z[ 4*64]) * 5153;
|
|
a += (z[ 5*64] + z[ 9*64]) * 6574;
|
|
a += (z[ 8*64] - z[ 6*64]) * 37489;
|
|
a += z[ 7*64] * 75038;
|
|
pcm[0] = drmp3d_scale_pcm(a);
|
|
|
|
z += 2;
|
|
a = z[14*64] * 104;
|
|
a += z[12*64] * 1567;
|
|
a += z[10*64] * 9727;
|
|
a += z[ 8*64] * 64019;
|
|
a += z[ 6*64] * -9975;
|
|
a += z[ 4*64] * -45;
|
|
a += z[ 2*64] * 146;
|
|
a += z[ 0*64] * -5;
|
|
pcm[16*nch] = drmp3d_scale_pcm(a);
|
|
}
|
|
|
|
static void drmp3d_synth(float *xl, short *dstl, int nch, float *lins)
|
|
{
|
|
int i;
|
|
float *xr = xl + 576*(nch - 1);
|
|
short *dstr = dstl + (nch - 1);
|
|
|
|
static const float g_win[] = {
|
|
-1,26,-31,208,218,401,-519,2063,2000,4788,-5517,7134,5959,35640,-39336,74992,
|
|
-1,24,-35,202,222,347,-581,2080,1952,4425,-5879,7640,5288,33791,-41176,74856,
|
|
-1,21,-38,196,225,294,-645,2087,1893,4063,-6237,8092,4561,31947,-43006,74630,
|
|
-1,19,-41,190,227,244,-711,2085,1822,3705,-6589,8492,3776,30112,-44821,74313,
|
|
-1,17,-45,183,228,197,-779,2075,1739,3351,-6935,8840,2935,28289,-46617,73908,
|
|
-1,16,-49,176,228,153,-848,2057,1644,3004,-7271,9139,2037,26482,-48390,73415,
|
|
-2,14,-53,169,227,111,-919,2032,1535,2663,-7597,9389,1082,24694,-50137,72835,
|
|
-2,13,-58,161,224,72,-991,2001,1414,2330,-7910,9592,70,22929,-51853,72169,
|
|
-2,11,-63,154,221,36,-1064,1962,1280,2006,-8209,9750,-998,21189,-53534,71420,
|
|
-2,10,-68,147,215,2,-1137,1919,1131,1692,-8491,9863,-2122,19478,-55178,70590,
|
|
-3,9,-73,139,208,-29,-1210,1870,970,1388,-8755,9935,-3300,17799,-56778,69679,
|
|
-3,8,-79,132,200,-57,-1283,1817,794,1095,-8998,9966,-4533,16155,-58333,68692,
|
|
-4,7,-85,125,189,-83,-1356,1759,605,814,-9219,9959,-5818,14548,-59838,67629,
|
|
-4,7,-91,117,177,-106,-1428,1698,402,545,-9416,9916,-7154,12980,-61289,66494,
|
|
-5,6,-97,111,163,-127,-1498,1634,185,288,-9585,9838,-8540,11455,-62684,65290
|
|
};
|
|
float *zlin = lins + 15*64;
|
|
const float *w = g_win;
|
|
|
|
zlin[4*15] = xl[18*16];
|
|
zlin[4*15 + 1] = xr[18*16];
|
|
zlin[4*15 + 2] = xl[0];
|
|
zlin[4*15 + 3] = xr[0];
|
|
|
|
zlin[4*31] = xl[1 + 18*16];
|
|
zlin[4*31 + 1] = xr[1 + 18*16];
|
|
zlin[4*31 + 2] = xl[1];
|
|
zlin[4*31 + 3] = xr[1];
|
|
|
|
drmp3d_synth_pair(dstr, nch, lins + 4*15 + 1);
|
|
drmp3d_synth_pair(dstr + 32*nch, nch, lins + 4*15 + 64 + 1);
|
|
drmp3d_synth_pair(dstl, nch, lins + 4*15);
|
|
drmp3d_synth_pair(dstl + 32*nch, nch, lins + 4*15 + 64);
|
|
|
|
#if DRMP3_HAVE_SIMD
|
|
if (drmp3_have_simd()) for (i = 14; i >= 0; i--)
|
|
{
|
|
#define DRMP3_VLOAD(k) drmp3_f4 w0 = DRMP3_VSET(*w++); drmp3_f4 w1 = DRMP3_VSET(*w++); drmp3_f4 vz = DRMP3_VLD(&zlin[4*i - 64*k]); drmp3_f4 vy = DRMP3_VLD(&zlin[4*i - 64*(15 - k)]);
|
|
#define DRMP3_V0(k) { DRMP3_VLOAD(k) b = DRMP3_VADD(DRMP3_VMUL(vz, w1), DRMP3_VMUL(vy, w0)) ; a = DRMP3_VSUB(DRMP3_VMUL(vz, w0), DRMP3_VMUL(vy, w1)); }
|
|
#define DRMP3_V1(k) { DRMP3_VLOAD(k) b = DRMP3_VADD(b, DRMP3_VADD(DRMP3_VMUL(vz, w1), DRMP3_VMUL(vy, w0))); a = DRMP3_VADD(a, DRMP3_VSUB(DRMP3_VMUL(vz, w0), DRMP3_VMUL(vy, w1))); }
|
|
#define DRMP3_V2(k) { DRMP3_VLOAD(k) b = DRMP3_VADD(b, DRMP3_VADD(DRMP3_VMUL(vz, w1), DRMP3_VMUL(vy, w0))); a = DRMP3_VADD(a, DRMP3_VSUB(DRMP3_VMUL(vy, w1), DRMP3_VMUL(vz, w0))); }
|
|
drmp3_f4 a, b;
|
|
zlin[4*i] = xl[18*(31 - i)];
|
|
zlin[4*i + 1] = xr[18*(31 - i)];
|
|
zlin[4*i + 2] = xl[1 + 18*(31 - i)];
|
|
zlin[4*i + 3] = xr[1 + 18*(31 - i)];
|
|
zlin[4*i + 64] = xl[1 + 18*(1 + i)];
|
|
zlin[4*i + 64 + 1] = xr[1 + 18*(1 + i)];
|
|
zlin[4*i - 64 + 2] = xl[18*(1 + i)];
|
|
zlin[4*i - 64 + 3] = xr[18*(1 + i)];
|
|
|
|
DRMP3_V0(0) DRMP3_V2(1) DRMP3_V1(2) DRMP3_V2(3) DRMP3_V1(4) DRMP3_V2(5) DRMP3_V1(6) DRMP3_V2(7)
|
|
|
|
{
|
|
#if DRMP3_HAVE_SSE
|
|
static const drmp3_f4 g_max = { 32767.0f, 32767.0f, 32767.0f, 32767.0f };
|
|
static const drmp3_f4 g_min = { -32768.0f, -32768.0f, -32768.0f, -32768.0f };
|
|
__m128i pcm8 = _mm_packs_epi32(_mm_cvtps_epi32(_mm_max_ps(_mm_min_ps(a, g_max), g_min)),
|
|
_mm_cvtps_epi32(_mm_max_ps(_mm_min_ps(b, g_max), g_min)));
|
|
dstr[(15 - i)*nch] = (short)_mm_extract_epi16(pcm8, 1);
|
|
dstr[(17 + i)*nch] = (short)_mm_extract_epi16(pcm8, 5);
|
|
dstl[(15 - i)*nch] = (short)_mm_extract_epi16(pcm8, 0);
|
|
dstl[(17 + i)*nch] = (short)_mm_extract_epi16(pcm8, 4);
|
|
dstr[(47 - i)*nch] = (short)_mm_extract_epi16(pcm8, 3);
|
|
dstr[(49 + i)*nch] = (short)_mm_extract_epi16(pcm8, 7);
|
|
dstl[(47 - i)*nch] = (short)_mm_extract_epi16(pcm8, 2);
|
|
dstl[(49 + i)*nch] = (short)_mm_extract_epi16(pcm8, 6);
|
|
#else
|
|
int16x4_t pcma, pcmb;
|
|
a = DRMP3_VADD(a, DRMP3_VSET(0.5f));
|
|
b = DRMP3_VADD(b, DRMP3_VSET(0.5f));
|
|
pcma = vqmovn_s32(vqaddq_s32(vcvtq_s32_f32(a), vreinterpretq_s32_u32(vcltq_f32(a, DRMP3_VSET(0)))));
|
|
pcmb = vqmovn_s32(vqaddq_s32(vcvtq_s32_f32(b), vreinterpretq_s32_u32(vcltq_f32(b, DRMP3_VSET(0)))));
|
|
vst1_lane_s16(dstr + (15 - i)*nch, pcma, 1);
|
|
vst1_lane_s16(dstr + (17 + i)*nch, pcmb, 1);
|
|
vst1_lane_s16(dstl + (15 - i)*nch, pcma, 0);
|
|
vst1_lane_s16(dstl + (17 + i)*nch, pcmb, 0);
|
|
vst1_lane_s16(dstr + (47 - i)*nch, pcma, 3);
|
|
vst1_lane_s16(dstr + (49 + i)*nch, pcmb, 3);
|
|
vst1_lane_s16(dstl + (47 - i)*nch, pcma, 2);
|
|
vst1_lane_s16(dstl + (49 + i)*nch, pcmb, 2);
|
|
#endif
|
|
}
|
|
} else
|
|
#endif
|
|
#ifdef DR_MP3_ONLY_SIMD
|
|
{}
|
|
#else
|
|
for (i = 14; i >= 0; i--)
|
|
{
|
|
#define DRMP3_LOAD(k) float w0 = *w++; float w1 = *w++; float *vz = &zlin[4*i - k*64]; float *vy = &zlin[4*i - (15 - k)*64];
|
|
#define DRMP3_S0(k) { int j; DRMP3_LOAD(k); for (j = 0; j < 4; j++) b[j] = vz[j]*w1 + vy[j]*w0, a[j] = vz[j]*w0 - vy[j]*w1; }
|
|
#define DRMP3_S1(k) { int j; DRMP3_LOAD(k); for (j = 0; j < 4; j++) b[j] += vz[j]*w1 + vy[j]*w0, a[j] += vz[j]*w0 - vy[j]*w1; }
|
|
#define DRMP3_S2(k) { int j; DRMP3_LOAD(k); for (j = 0; j < 4; j++) b[j] += vz[j]*w1 + vy[j]*w0, a[j] += vy[j]*w1 - vz[j]*w0; }
|
|
float a[4], b[4];
|
|
|
|
zlin[4*i] = xl[18*(31 - i)];
|
|
zlin[4*i + 1] = xr[18*(31 - i)];
|
|
zlin[4*i + 2] = xl[1 + 18*(31 - i)];
|
|
zlin[4*i + 3] = xr[1 + 18*(31 - i)];
|
|
zlin[4*(i + 16)] = xl[1 + 18*(1 + i)];
|
|
zlin[4*(i + 16) + 1] = xr[1 + 18*(1 + i)];
|
|
zlin[4*(i - 16) + 2] = xl[18*(1 + i)];
|
|
zlin[4*(i - 16) + 3] = xr[18*(1 + i)];
|
|
|
|
DRMP3_S0(0) DRMP3_S2(1) DRMP3_S1(2) DRMP3_S2(3) DRMP3_S1(4) DRMP3_S2(5) DRMP3_S1(6) DRMP3_S2(7)
|
|
|
|
dstr[(15 - i)*nch] = drmp3d_scale_pcm(a[1]);
|
|
dstr[(17 + i)*nch] = drmp3d_scale_pcm(b[1]);
|
|
dstl[(15 - i)*nch] = drmp3d_scale_pcm(a[0]);
|
|
dstl[(17 + i)*nch] = drmp3d_scale_pcm(b[0]);
|
|
dstr[(47 - i)*nch] = drmp3d_scale_pcm(a[3]);
|
|
dstr[(49 + i)*nch] = drmp3d_scale_pcm(b[3]);
|
|
dstl[(47 - i)*nch] = drmp3d_scale_pcm(a[2]);
|
|
dstl[(49 + i)*nch] = drmp3d_scale_pcm(b[2]);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void drmp3d_synth_granule(float *qmf_state, float *grbuf, int nbands, int nch, short *pcm, float *lins)
|
|
{
|
|
int i;
|
|
for (i = 0; i < nch; i++)
|
|
{
|
|
drmp3d_DCT_II(grbuf + 576*i, nbands);
|
|
}
|
|
|
|
memcpy(lins, qmf_state, sizeof(float)*15*64);
|
|
|
|
for (i = 0; i < nbands; i += 2)
|
|
{
|
|
drmp3d_synth(grbuf + i, pcm + 32*nch*i, nch, lins + i*64);
|
|
}
|
|
#ifndef DR_MP3_NONSTANDARD_BUT_LOGICAL
|
|
if (nch == 1)
|
|
{
|
|
for (i = 0; i < 15*64; i += 2)
|
|
{
|
|
qmf_state[i] = lins[nbands*64 + i];
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
memcpy(qmf_state, lins + nbands*64, sizeof(float)*15*64);
|
|
}
|
|
}
|
|
|
|
static int drmp3d_match_frame(const drmp3_uint8 *hdr, int mp3_bytes, int frame_bytes)
|
|
{
|
|
int i, nmatch;
|
|
for (i = 0, nmatch = 0; nmatch < DRMP3_MAX_FRAME_SYNC_MATCHES; nmatch++)
|
|
{
|
|
i += drmp3_hdr_frame_bytes(hdr + i, frame_bytes) + drmp3_hdr_padding(hdr + i);
|
|
if (i + DRMP3_HDR_SIZE > mp3_bytes)
|
|
return nmatch > 0;
|
|
if (!drmp3_hdr_compare(hdr, hdr + i))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int drmp3d_find_frame(const drmp3_uint8 *mp3, int mp3_bytes, int *free_format_bytes, int *ptr_frame_bytes)
|
|
{
|
|
int i, k;
|
|
for (i = 0; i < mp3_bytes - DRMP3_HDR_SIZE; i++, mp3++)
|
|
{
|
|
if (drmp3_hdr_valid(mp3))
|
|
{
|
|
int frame_bytes = drmp3_hdr_frame_bytes(mp3, *free_format_bytes);
|
|
int frame_and_padding = frame_bytes + drmp3_hdr_padding(mp3);
|
|
|
|
for (k = DRMP3_HDR_SIZE; !frame_bytes && k < DRMP3_MAX_FREE_FORMAT_FRAME_SIZE && i + 2*k < mp3_bytes - DRMP3_HDR_SIZE; k++)
|
|
{
|
|
if (drmp3_hdr_compare(mp3, mp3 + k))
|
|
{
|
|
int fb = k - drmp3_hdr_padding(mp3);
|
|
int nextfb = fb + drmp3_hdr_padding(mp3 + k);
|
|
if (i + k + nextfb + DRMP3_HDR_SIZE > mp3_bytes || !drmp3_hdr_compare(mp3, mp3 + k + nextfb))
|
|
continue;
|
|
frame_and_padding = k;
|
|
frame_bytes = fb;
|
|
*free_format_bytes = fb;
|
|
}
|
|
}
|
|
|
|
if ((frame_bytes && i + frame_and_padding <= mp3_bytes &&
|
|
drmp3d_match_frame(mp3, mp3_bytes - i, frame_bytes)) ||
|
|
(!i && frame_and_padding == mp3_bytes))
|
|
{
|
|
*ptr_frame_bytes = frame_and_padding;
|
|
return i;
|
|
}
|
|
*free_format_bytes = 0;
|
|
}
|
|
}
|
|
*ptr_frame_bytes = 0;
|
|
return i;
|
|
}
|
|
|
|
void drmp3dec_init(drmp3dec *dec)
|
|
{
|
|
dec->header[0] = 0;
|
|
}
|
|
|
|
int drmp3dec_decode_frame(drmp3dec *dec, const unsigned char *mp3, int mp3_bytes, short *pcm, drmp3dec_frame_info *info)
|
|
{
|
|
int i = 0, igr, frame_size = 0, success = 1;
|
|
const drmp3_uint8 *hdr;
|
|
drmp3_bs bs_frame[1];
|
|
drmp3dec_scratch scratch;
|
|
|
|
if (mp3_bytes > 4 && dec->header[0] == 0xff && drmp3_hdr_compare(dec->header, mp3))
|
|
{
|
|
frame_size = drmp3_hdr_frame_bytes(mp3, dec->free_format_bytes) + drmp3_hdr_padding(mp3);
|
|
if (frame_size != mp3_bytes && (frame_size + DRMP3_HDR_SIZE > mp3_bytes || !drmp3_hdr_compare(mp3, mp3 + frame_size)))
|
|
{
|
|
frame_size = 0;
|
|
}
|
|
}
|
|
if (!frame_size)
|
|
{
|
|
memset(dec, 0, sizeof(drmp3dec));
|
|
i = drmp3d_find_frame(mp3, mp3_bytes, &dec->free_format_bytes, &frame_size);
|
|
if (!frame_size || i + frame_size > mp3_bytes)
|
|
{
|
|
info->frame_bytes = i;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
hdr = mp3 + i;
|
|
memcpy(dec->header, hdr, DRMP3_HDR_SIZE);
|
|
info->frame_bytes = i + frame_size;
|
|
info->channels = DRMP3_HDR_IS_MONO(hdr) ? 1 : 2;
|
|
info->hz = drmp3_hdr_sample_rate_hz(hdr);
|
|
info->layer = 4 - DRMP3_HDR_GET_LAYER(hdr);
|
|
info->bitrate_kbps = drmp3_hdr_bitrate_kbps(hdr);
|
|
|
|
drmp3_bs_init(bs_frame, hdr + DRMP3_HDR_SIZE, frame_size - DRMP3_HDR_SIZE);
|
|
if (DRMP3_HDR_IS_CRC(hdr))
|
|
{
|
|
drmp3_bs_get_bits(bs_frame, 16);
|
|
}
|
|
|
|
if (info->layer == 3)
|
|
{
|
|
int main_data_begin = drmp3_L3_read_side_info(bs_frame, scratch.gr_info, hdr);
|
|
if (main_data_begin < 0 || bs_frame->pos > bs_frame->limit)
|
|
{
|
|
drmp3dec_init(dec);
|
|
return 0;
|
|
}
|
|
success = drmp3_L3_restore_reservoir(dec, bs_frame, &scratch, main_data_begin);
|
|
if (success)
|
|
{
|
|
for (igr = 0; igr < (DRMP3_HDR_TEST_MPEG1(hdr) ? 2 : 1); igr++, pcm += 576*info->channels)
|
|
{
|
|
memset(scratch.grbuf[0], 0, 576*2*sizeof(float));
|
|
drmp3_L3_decode(dec, &scratch, scratch.gr_info + igr*info->channels, info->channels);
|
|
drmp3d_synth_granule(dec->qmf_state, scratch.grbuf[0], 18, info->channels, pcm, scratch.syn[0]);
|
|
}
|
|
}
|
|
drmp3_L3_save_reservoir(dec, &scratch);
|
|
} else
|
|
{
|
|
#ifdef DR_MP3_ONLY_MP3
|
|
return 0;
|
|
#else
|
|
drmp3_L12_scale_info sci[1];
|
|
drmp3_L12_read_scale_info(hdr, bs_frame, sci);
|
|
|
|
memset(scratch.grbuf[0], 0, 576*2*sizeof(float));
|
|
for (i = 0, igr = 0; igr < 3; igr++)
|
|
{
|
|
if (12 == (i += drmp3_L12_dequantize_granule(scratch.grbuf[0] + i, bs_frame, sci, info->layer | 1)))
|
|
{
|
|
i = 0;
|
|
drmp3_L12_apply_scf_384(sci, sci->scf + igr, scratch.grbuf[0]);
|
|
drmp3d_synth_granule(dec->qmf_state, scratch.grbuf[0], 12, info->channels, pcm, scratch.syn[0]);
|
|
memset(scratch.grbuf[0], 0, 576*2*sizeof(float));
|
|
pcm += 384*info->channels;
|
|
}
|
|
if (bs_frame->pos > bs_frame->limit)
|
|
{
|
|
drmp3dec_init(dec);
|
|
return 0;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
return success*drmp3_hdr_frame_samples(dec->header);
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
*
|
|
* Main Public API
|
|
*
|
|
*/
|
|
|
|
/* Options. */
|
|
#ifndef DR_MP3_DEFAULT_CHANNELS
|
|
#define DR_MP3_DEFAULT_CHANNELS 2
|
|
#endif
|
|
#ifndef DR_MP3_DEFAULT_SAMPLE_RATE
|
|
#define DR_MP3_DEFAULT_SAMPLE_RATE 44100
|
|
#endif
|
|
|
|
/* Standard library stuff. */
|
|
#ifndef DRMP3_ASSERT
|
|
#include <assert.h>
|
|
#define DRMP3_ASSERT(expression) assert(expression)
|
|
#endif
|
|
#ifndef DRMP3_COPY_MEMORY
|
|
#define DRMP3_COPY_MEMORY(dst, src, sz) memcpy((dst), (src), (sz))
|
|
#endif
|
|
#ifndef DRMP3_ZERO_MEMORY
|
|
#define DRMP3_ZERO_MEMORY(p, sz) memset((p), 0, (sz))
|
|
#endif
|
|
#define DRMP3_ZERO_OBJECT(p) DRMP3_ZERO_MEMORY((p), sizeof(*(p)))
|
|
#ifndef DRMP3_MALLOC
|
|
#define DRMP3_MALLOC(sz) malloc((sz))
|
|
#endif
|
|
#ifndef DRMP3_REALLOC
|
|
#define DRMP3_REALLOC(p, sz) realloc((p), (sz))
|
|
#endif
|
|
#ifndef DRMP3_FREE
|
|
#define DRMP3_FREE(p) free((p))
|
|
#endif
|
|
|
|
#define drmp3_assert DRMP3_ASSERT
|
|
#define drmp3_copy_memory DRMP3_COPY_MEMORY
|
|
#define drmp3_zero_memory DRMP3_ZERO_MEMORY
|
|
#define drmp3_zero_object DRMP3_ZERO_OBJECT
|
|
#define drmp3_malloc DRMP3_MALLOC
|
|
#define drmp3_realloc DRMP3_REALLOC
|
|
|
|
#define drmp3_countof(x) (sizeof(x) / sizeof(x[0]))
|
|
#define drmp3_max(x, y) (((x) > (y)) ? (x) : (y))
|
|
#define drmp3_min(x, y) (((x) < (y)) ? (x) : (y))
|
|
|
|
#define DRMP3_DATA_CHUNK_SIZE 16384 /* The size in bytes of each chunk of data to read from the MP3 stream. minimp3 recommends 16K. */
|
|
|
|
static INLINE float drmp3_mix_f32(float x, float y, float a)
|
|
{
|
|
return x*(1-a) + y*a;
|
|
}
|
|
|
|
static void drmp3_blend_f32(float* pOut, float* pInA, float* pInB, float factor, drmp3_uint32 channels)
|
|
{
|
|
uint32_t i;
|
|
for (i = 0; i < channels; ++i)
|
|
pOut[i] = drmp3_mix_f32(pInA[i], pInB[i], factor);
|
|
}
|
|
|
|
void drmp3_src_cache_init(drmp3_src* pSRC, drmp3_src_cache* pCache)
|
|
{
|
|
drmp3_assert(pSRC != NULL);
|
|
drmp3_assert(pCache != NULL);
|
|
|
|
pCache->pSRC = pSRC;
|
|
pCache->cachedFrameCount = 0;
|
|
pCache->iNextFrame = 0;
|
|
}
|
|
|
|
drmp3_uint64 drmp3_src_cache_read_frames(drmp3_src_cache* pCache, drmp3_uint64 frameCount, float* pFramesOut)
|
|
{
|
|
drmp3_uint32 channels;
|
|
drmp3_uint64 totalFramesRead = 0;
|
|
|
|
drmp3_assert(pCache != NULL);
|
|
drmp3_assert(pCache->pSRC != NULL);
|
|
drmp3_assert(pCache->pSRC->onRead != NULL);
|
|
drmp3_assert(frameCount > 0);
|
|
drmp3_assert(pFramesOut != NULL);
|
|
|
|
channels = pCache->pSRC->config.channels;
|
|
|
|
while (frameCount > 0)
|
|
{
|
|
drmp3_uint32 framesToReadFromClient;
|
|
/* If there's anything in memory go ahead and copy that over first. */
|
|
drmp3_uint64 framesRemainingInMemory = pCache->cachedFrameCount - pCache->iNextFrame;
|
|
drmp3_uint64 framesToReadFromMemory = frameCount;
|
|
if (framesToReadFromMemory > framesRemainingInMemory)
|
|
framesToReadFromMemory = framesRemainingInMemory;
|
|
|
|
drmp3_copy_memory(pFramesOut, pCache->pCachedFrames + pCache->iNextFrame*channels, (drmp3_uint32)(framesToReadFromMemory * channels * sizeof(float)));
|
|
pCache->iNextFrame += (drmp3_uint32)framesToReadFromMemory;
|
|
|
|
totalFramesRead += framesToReadFromMemory;
|
|
frameCount -= framesToReadFromMemory;
|
|
if (frameCount == 0)
|
|
break;
|
|
|
|
|
|
/* At this point there are still more frames to read from the client, so we'll need to reload the cache with fresh data. */
|
|
drmp3_assert(frameCount > 0);
|
|
pFramesOut += framesToReadFromMemory * channels;
|
|
|
|
pCache->iNextFrame = 0;
|
|
pCache->cachedFrameCount = 0;
|
|
|
|
framesToReadFromClient = drmp3_countof(pCache->pCachedFrames) / pCache->pSRC->config.channels;
|
|
if (framesToReadFromClient > pCache->pSRC->config.cacheSizeInFrames)
|
|
framesToReadFromClient = pCache->pSRC->config.cacheSizeInFrames;
|
|
|
|
pCache->cachedFrameCount = (drmp3_uint32)pCache->pSRC->onRead(pCache->pSRC, framesToReadFromClient, pCache->pCachedFrames, pCache->pSRC->pUserData);
|
|
|
|
|
|
/* Get out of this loop if nothing was able to be retrieved. */
|
|
if (pCache->cachedFrameCount == 0)
|
|
break;
|
|
}
|
|
|
|
return totalFramesRead;
|
|
}
|
|
|
|
|
|
drmp3_uint64 drmp3_src_read_frames_passthrough(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, drmp3_bool32 flush);
|
|
drmp3_uint64 drmp3_src_read_frames_linear(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, drmp3_bool32 flush);
|
|
|
|
drmp3_bool32 drmp3_src_init(const drmp3_src_config* pConfig, drmp3_src_read_proc onRead, void* pUserData, drmp3_src* pSRC)
|
|
{
|
|
if (pSRC == NULL) return DRMP3_FALSE;
|
|
drmp3_zero_object(pSRC);
|
|
|
|
if (pConfig == NULL || onRead == NULL) return DRMP3_FALSE;
|
|
if (pConfig->channels == 0 || pConfig->channels > 2) return DRMP3_FALSE;
|
|
|
|
pSRC->config = *pConfig;
|
|
pSRC->onRead = onRead;
|
|
pSRC->pUserData = pUserData;
|
|
|
|
if (pSRC->config.cacheSizeInFrames > DRMP3_SRC_CACHE_SIZE_IN_FRAMES || pSRC->config.cacheSizeInFrames == 0)
|
|
pSRC->config.cacheSizeInFrames = DRMP3_SRC_CACHE_SIZE_IN_FRAMES;
|
|
|
|
drmp3_src_cache_init(pSRC, &pSRC->cache);
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_src_set_input_sample_rate(drmp3_src* pSRC, drmp3_uint32 sampleRateIn)
|
|
{
|
|
if (pSRC == NULL) return DRMP3_FALSE;
|
|
|
|
/* Must have a sample rate of > 0. */
|
|
if (sampleRateIn == 0)
|
|
return DRMP3_FALSE;
|
|
|
|
pSRC->config.sampleRateIn = sampleRateIn;
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_src_set_output_sample_rate(drmp3_src* pSRC, drmp3_uint32 sampleRateOut)
|
|
{
|
|
if (pSRC == NULL) return DRMP3_FALSE;
|
|
|
|
/* Must have a sample rate of > 0. */
|
|
if (sampleRateOut == 0)
|
|
return DRMP3_FALSE;
|
|
|
|
pSRC->config.sampleRateOut = sampleRateOut;
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
drmp3_uint64 drmp3_src_read_frames_ex(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, drmp3_bool32 flush)
|
|
{
|
|
drmp3_src_algorithm algorithm;
|
|
if (pSRC == NULL || frameCount == 0 || pFramesOut == NULL) return 0;
|
|
|
|
algorithm = pSRC->config.algorithm;
|
|
|
|
/* Always use passthrough if the sample rates are the same. */
|
|
if (pSRC->config.sampleRateIn == pSRC->config.sampleRateOut)
|
|
algorithm = drmp3_src_algorithm_none;
|
|
|
|
/* Could just use a function pointer instead of a switch for this... */
|
|
switch (algorithm)
|
|
{
|
|
case drmp3_src_algorithm_none: return drmp3_src_read_frames_passthrough(pSRC, frameCount, pFramesOut, flush);
|
|
case drmp3_src_algorithm_linear: return drmp3_src_read_frames_linear(pSRC, frameCount, pFramesOut, flush);
|
|
default: return 0;
|
|
}
|
|
}
|
|
|
|
drmp3_uint64 drmp3_src_read_frames(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut)
|
|
{
|
|
return drmp3_src_read_frames_ex(pSRC, frameCount, pFramesOut, DRMP3_FALSE);
|
|
}
|
|
|
|
drmp3_uint64 drmp3_src_read_frames_passthrough(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, drmp3_bool32 flush)
|
|
{
|
|
drmp3_assert(pSRC != NULL);
|
|
drmp3_assert(frameCount > 0);
|
|
drmp3_assert(pFramesOut != NULL);
|
|
|
|
(void)flush; /* Passthrough need not care about flushing. */
|
|
return pSRC->onRead(pSRC, frameCount, pFramesOut, pSRC->pUserData);
|
|
}
|
|
|
|
drmp3_uint64 drmp3_src_read_frames_linear(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, drmp3_bool32 flush)
|
|
{
|
|
float factor;
|
|
drmp3_uint64 totalFramesRead = 0;
|
|
|
|
drmp3_assert(pSRC != NULL);
|
|
drmp3_assert(frameCount > 0);
|
|
drmp3_assert(pFramesOut != NULL);
|
|
|
|
/* For linear SRC, the bin is only 2 frames: 1 prior, 1 future. */
|
|
|
|
/* Load the bin if necessary. */
|
|
if (!pSRC->algo.linear.isPrevFramesLoaded)
|
|
{
|
|
drmp3_uint64 framesRead = drmp3_src_cache_read_frames(&pSRC->cache, 1, pSRC->bin);
|
|
if (framesRead == 0)
|
|
return 0;
|
|
pSRC->algo.linear.isPrevFramesLoaded = DRMP3_TRUE;
|
|
}
|
|
if (!pSRC->algo.linear.isNextFramesLoaded)
|
|
{
|
|
drmp3_uint64 framesRead = drmp3_src_cache_read_frames(&pSRC->cache, 1, pSRC->bin + pSRC->config.channels);
|
|
if (framesRead == 0)
|
|
return 0;
|
|
pSRC->algo.linear.isNextFramesLoaded = DRMP3_TRUE;
|
|
}
|
|
|
|
factor = (float)pSRC->config.sampleRateIn / pSRC->config.sampleRateOut;
|
|
|
|
while (frameCount > 0)
|
|
{
|
|
drmp3_uint32 i;
|
|
drmp3_uint32 framesToReadFromClient;
|
|
/* The bin is where the previous and next frames are located. */
|
|
float* pPrevFrame = pSRC->bin;
|
|
float* pNextFrame = pSRC->bin + pSRC->config.channels;
|
|
|
|
drmp3_blend_f32((float*)pFramesOut, pPrevFrame, pNextFrame, pSRC->algo.linear.alpha, pSRC->config.channels);
|
|
|
|
pSRC->algo.linear.alpha += factor;
|
|
|
|
/* The new alpha value is how we determine whether or not we need to read fresh frames. */
|
|
framesToReadFromClient = (drmp3_uint32)pSRC->algo.linear.alpha;
|
|
pSRC->algo.linear.alpha = pSRC->algo.linear.alpha - framesToReadFromClient;
|
|
|
|
for (i = 0; i < framesToReadFromClient; ++i)
|
|
{
|
|
drmp3_uint32 j;
|
|
drmp3_uint64 framesRead;
|
|
for (j = 0; j < pSRC->config.channels; ++j)
|
|
pPrevFrame[j] = pNextFrame[j];
|
|
|
|
framesRead = drmp3_src_cache_read_frames(&pSRC->cache, 1, pNextFrame);
|
|
if (framesRead == 0)
|
|
{
|
|
drmp3_uint32 j;
|
|
for (j = 0; j < pSRC->config.channels; ++j)
|
|
pNextFrame[j] = 0;
|
|
|
|
if (pSRC->algo.linear.isNextFramesLoaded)
|
|
pSRC->algo.linear.isNextFramesLoaded = DRMP3_FALSE;
|
|
else
|
|
{
|
|
if (flush)
|
|
pSRC->algo.linear.isPrevFramesLoaded = DRMP3_FALSE;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
pFramesOut = (drmp3_uint8*)pFramesOut + (1 * pSRC->config.channels * sizeof(float));
|
|
frameCount -= 1;
|
|
totalFramesRead += 1;
|
|
|
|
/* If there's no frames available we need to get out of this loop. */
|
|
if (!pSRC->algo.linear.isNextFramesLoaded && (!flush || !pSRC->algo.linear.isPrevFramesLoaded))
|
|
break;
|
|
}
|
|
|
|
return totalFramesRead;
|
|
}
|
|
|
|
|
|
|
|
static drmp3_bool32 drmp3_decode_next_frame(drmp3* pMP3)
|
|
{
|
|
drmp3_assert(pMP3 != NULL);
|
|
drmp3_assert(pMP3->onRead != NULL);
|
|
|
|
if (pMP3->atEnd)
|
|
return DRMP3_FALSE;
|
|
|
|
do
|
|
{
|
|
drmp3dec_frame_info info;
|
|
drmp3_uint32 samplesRead;
|
|
|
|
/* minimp3 recommends doing data submission in 16K chunks. If we don't have at least 16K bytes available, get more. */
|
|
if (pMP3->dataSize < DRMP3_DATA_CHUNK_SIZE)
|
|
{
|
|
size_t bytesRead;
|
|
|
|
if (pMP3->dataCapacity < DRMP3_DATA_CHUNK_SIZE)
|
|
{
|
|
drmp3_uint8* pNewData = NULL;
|
|
pMP3->dataCapacity = DRMP3_DATA_CHUNK_SIZE;
|
|
|
|
pNewData = (drmp3_uint8*)
|
|
drmp3_realloc(pMP3->pData, pMP3->dataCapacity);
|
|
if (pNewData == NULL)
|
|
return DRMP3_FALSE; /* Out of memory. */
|
|
|
|
pMP3->pData = pNewData;
|
|
}
|
|
|
|
bytesRead = pMP3->onRead(pMP3->pUserData, pMP3->pData + pMP3->dataSize, (pMP3->dataCapacity - pMP3->dataSize));
|
|
if (bytesRead == 0)
|
|
{
|
|
pMP3->atEnd = DRMP3_TRUE;
|
|
return DRMP3_FALSE; /* No data. */
|
|
}
|
|
|
|
pMP3->dataSize += bytesRead;
|
|
}
|
|
|
|
if (pMP3->dataSize > INT_MAX)
|
|
{
|
|
pMP3->atEnd = DRMP3_TRUE;
|
|
return DRMP3_FALSE; /* File too big. */
|
|
}
|
|
|
|
samplesRead = drmp3dec_decode_frame(&pMP3->decoder, pMP3->pData, (int)pMP3->dataSize, pMP3->frames, &info); /* <-- Safe size_t -> int conversion thanks to the check above. */
|
|
if (samplesRead != 0)
|
|
{
|
|
size_t i;
|
|
size_t leftoverDataSize = (pMP3->dataSize - (size_t)info.frame_bytes);
|
|
for (i = 0; i < leftoverDataSize; ++i)
|
|
pMP3->pData[i] = pMP3->pData[i + (size_t)info.frame_bytes];
|
|
|
|
pMP3->dataSize = leftoverDataSize;
|
|
pMP3->framesConsumed = 0;
|
|
pMP3->framesRemaining = samplesRead;
|
|
pMP3->frameChannels = info.channels;
|
|
pMP3->frameSampleRate = info.hz;
|
|
drmp3_src_set_input_sample_rate(&pMP3->src, pMP3->frameSampleRate);
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
size_t bytesRead;
|
|
/* Need more data. minimp3 recommends doing data submission in 16K chunks. */
|
|
if (pMP3->dataCapacity == pMP3->dataSize)
|
|
{
|
|
drmp3_uint8 *pNewData = NULL;
|
|
/* No room. Expand. */
|
|
pMP3->dataCapacity += DRMP3_DATA_CHUNK_SIZE;
|
|
|
|
pNewData = (drmp3_uint8*)drmp3_realloc(pMP3->pData, pMP3->dataCapacity);
|
|
if (pNewData == NULL)
|
|
return DRMP3_FALSE; /* Out of memory. */
|
|
|
|
pMP3->pData = pNewData;
|
|
}
|
|
|
|
/* Fill in a chunk. */
|
|
bytesRead = pMP3->onRead(pMP3->pUserData, pMP3->pData + pMP3->dataSize, (pMP3->dataCapacity - pMP3->dataSize));
|
|
if (bytesRead == 0)
|
|
{
|
|
pMP3->atEnd = DRMP3_TRUE;
|
|
return DRMP3_FALSE; /* Error reading more data. */
|
|
}
|
|
|
|
pMP3->dataSize += bytesRead;
|
|
}
|
|
} while (DRMP3_TRUE);
|
|
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
static drmp3_uint64 drmp3_read_src(drmp3_src* pSRC, drmp3_uint64 frameCount, void* pFramesOut, void* pUserData)
|
|
{
|
|
float* pFramesOutF;
|
|
drmp3_uint32 totalFramesRead = 0;
|
|
drmp3* pMP3 = (drmp3*)pUserData;
|
|
|
|
drmp3_assert(pMP3 != NULL);
|
|
drmp3_assert(pMP3->onRead != NULL);
|
|
|
|
pFramesOutF = (float*)pFramesOut;
|
|
|
|
while (frameCount > 0)
|
|
{
|
|
/* Read from the in-memory buffer first. */
|
|
while (pMP3->framesRemaining > 0 && frameCount > 0)
|
|
{
|
|
if (pMP3->frameChannels == 1)
|
|
{
|
|
if (pMP3->channels == 1)
|
|
{
|
|
/* Mono -> Mono. */
|
|
pFramesOutF[0] = pMP3->frames[pMP3->framesConsumed] / 32768.0f;
|
|
} else {
|
|
/* Mono -> Stereo. */
|
|
pFramesOutF[0] = pMP3->frames[pMP3->framesConsumed] / 32768.0f;
|
|
pFramesOutF[1] = pMP3->frames[pMP3->framesConsumed] / 32768.0f;
|
|
}
|
|
} else {
|
|
if (pMP3->channels == 1)
|
|
{
|
|
/* Stereo -> Mono */
|
|
float sample = 0;
|
|
sample += pMP3->frames[(pMP3->framesConsumed*pMP3->frameChannels)+0] / 32768.0f;
|
|
sample += pMP3->frames[(pMP3->framesConsumed*pMP3->frameChannels)+1] / 32768.0f;
|
|
pFramesOutF[0] = sample * 0.5f;
|
|
} else {
|
|
/* Stereo -> Stereo */
|
|
pFramesOutF[0] = pMP3->frames[(pMP3->framesConsumed*pMP3->frameChannels)+0] / 32768.0f;
|
|
pFramesOutF[1] = pMP3->frames[(pMP3->framesConsumed*pMP3->frameChannels)+1] / 32768.0f;
|
|
}
|
|
}
|
|
|
|
pMP3->framesConsumed += 1;
|
|
pMP3->framesRemaining -= 1;
|
|
frameCount -= 1;
|
|
totalFramesRead += 1;
|
|
pFramesOutF += pSRC->config.channels;
|
|
}
|
|
|
|
if (frameCount == 0)
|
|
break;
|
|
|
|
drmp3_assert(pMP3->framesRemaining == 0);
|
|
|
|
/* At this point we have exhausted our in-memory buffer so we need to re-fill. Note that the sample rate may have changed
|
|
* at this point which means we'll also need to update our sample rate conversion pipeline. */
|
|
if (!drmp3_decode_next_frame(pMP3))
|
|
break;
|
|
}
|
|
|
|
return totalFramesRead;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_init_internal(drmp3* pMP3, drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, const drmp3_config* pConfig)
|
|
{
|
|
drmp3_config config;
|
|
drmp3_src_config srcConfig;
|
|
|
|
drmp3_assert(pMP3 != NULL);
|
|
drmp3_assert(onRead != NULL);
|
|
|
|
/* This function assumes the output object has already been reset to 0. Do not do that here, otherwise things will break. */
|
|
drmp3dec_init(&pMP3->decoder);
|
|
|
|
/* The config can be null in which case we use defaults. */
|
|
if (pConfig != NULL)
|
|
config = *pConfig;
|
|
else
|
|
drmp3_zero_object(&config);
|
|
|
|
pMP3->channels = config.outputChannels;
|
|
if (pMP3->channels == 0)
|
|
pMP3->channels = DR_MP3_DEFAULT_CHANNELS;
|
|
|
|
/* Cannot have more than 2 channels. */
|
|
if (pMP3->channels > 2)
|
|
pMP3->channels = 2;
|
|
|
|
pMP3->sampleRate = config.outputSampleRate;
|
|
if (pMP3->sampleRate == 0)
|
|
pMP3->sampleRate = DR_MP3_DEFAULT_SAMPLE_RATE;
|
|
|
|
pMP3->onRead = onRead;
|
|
pMP3->onSeek = onSeek;
|
|
pMP3->pUserData = pUserData;
|
|
|
|
/* We need a sample rate converter for converting the sample rate from the MP3 frames to the requested output sample rate. */
|
|
drmp3_zero_object(&srcConfig);
|
|
srcConfig.sampleRateIn = DR_MP3_DEFAULT_SAMPLE_RATE;
|
|
srcConfig.sampleRateOut = pMP3->sampleRate;
|
|
srcConfig.channels = pMP3->channels;
|
|
srcConfig.algorithm = drmp3_src_algorithm_linear;
|
|
if (!drmp3_src_init(&srcConfig, drmp3_read_src, pMP3, &pMP3->src))
|
|
return DRMP3_FALSE;
|
|
|
|
/* Decode the first frame to confirm that it is indeed a valid MP3 stream. */
|
|
if (!drmp3_decode_next_frame(pMP3))
|
|
return DRMP3_FALSE; /* Not a valid MP3 stream. */
|
|
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_init(drmp3* pMP3, drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, const drmp3_config* pConfig)
|
|
{
|
|
if (pMP3 == NULL || onRead == NULL)
|
|
return DRMP3_FALSE;
|
|
|
|
drmp3_zero_object(pMP3);
|
|
return drmp3_init_internal(pMP3, onRead, onSeek, pUserData, pConfig);
|
|
}
|
|
|
|
|
|
static size_t drmp3__on_read_memory(void* pUserData, void* pBufferOut, size_t bytesToRead)
|
|
{
|
|
size_t bytesRemaining;
|
|
drmp3* pMP3 = (drmp3*)pUserData;
|
|
drmp3_assert(pMP3 != NULL);
|
|
drmp3_assert(pMP3->memory.dataSize >= pMP3->memory.currentReadPos);
|
|
|
|
bytesRemaining = pMP3->memory.dataSize - pMP3->memory.currentReadPos;
|
|
if (bytesToRead > bytesRemaining)
|
|
bytesToRead = bytesRemaining;
|
|
|
|
if (bytesToRead > 0)
|
|
{
|
|
drmp3_copy_memory(pBufferOut, pMP3->memory.pData + pMP3->memory.currentReadPos, bytesToRead);
|
|
pMP3->memory.currentReadPos += bytesToRead;
|
|
}
|
|
|
|
return bytesToRead;
|
|
}
|
|
|
|
static drmp3_bool32 drmp3__on_seek_memory(void* pUserData, int byteOffset, drmp3_seek_origin origin)
|
|
{
|
|
drmp3* pMP3 = (drmp3*)pUserData;
|
|
drmp3_assert(pMP3 != NULL);
|
|
|
|
if (origin == drmp3_seek_origin_current)
|
|
{
|
|
if (byteOffset > 0)
|
|
{
|
|
if (pMP3->memory.currentReadPos + byteOffset > pMP3->memory.dataSize)
|
|
byteOffset = (int)(pMP3->memory.dataSize - pMP3->memory.currentReadPos); /* Trying to seek too far forward. */
|
|
}
|
|
else
|
|
{
|
|
if (pMP3->memory.currentReadPos < (size_t)-byteOffset)
|
|
byteOffset = -(int)pMP3->memory.currentReadPos; /* Trying to seek too far backwards. */
|
|
}
|
|
|
|
/* This will never underflow thanks to the clamps above. */
|
|
pMP3->memory.currentReadPos += byteOffset;
|
|
} else {
|
|
if ((drmp3_uint32)byteOffset <= pMP3->memory.dataSize)
|
|
pMP3->memory.currentReadPos = byteOffset;
|
|
else
|
|
pMP3->memory.currentReadPos = pMP3->memory.dataSize; /* Trying to seek too far forward. */
|
|
}
|
|
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_init_memory(drmp3* pMP3, const void* pData, size_t dataSize, const drmp3_config* pConfig)
|
|
{
|
|
if (pMP3 == NULL)
|
|
return DRMP3_FALSE;
|
|
|
|
drmp3_zero_object(pMP3);
|
|
|
|
if (pData == NULL || dataSize == 0)
|
|
return DRMP3_FALSE;
|
|
|
|
pMP3->memory.pData = (const drmp3_uint8*)pData;
|
|
pMP3->memory.dataSize = dataSize;
|
|
pMP3->memory.currentReadPos = 0;
|
|
|
|
return drmp3_init_internal(pMP3, drmp3__on_read_memory, drmp3__on_seek_memory, pMP3, pConfig);
|
|
}
|
|
|
|
|
|
#ifndef DR_MP3_NO_STDIO
|
|
#include <stdio.h>
|
|
|
|
static size_t drmp3__on_read_stdio(void* pUserData, void* pBufferOut, size_t bytesToRead)
|
|
{
|
|
return fread(pBufferOut, 1, bytesToRead, (FILE*)pUserData);
|
|
}
|
|
|
|
static drmp3_bool32 drmp3__on_seek_stdio(void* pUserData, int offset, drmp3_seek_origin origin)
|
|
{
|
|
return fseek((FILE*)pUserData, offset, (origin == drmp3_seek_origin_current) ? SEEK_CUR : SEEK_SET) == 0;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_init_file(drmp3* pMP3, const char* filePath, const drmp3_config* pConfig)
|
|
{
|
|
FILE* pFile;
|
|
#if defined(_MSC_VER) && _MSC_VER >= 1400
|
|
if (fopen_s(&pFile, filePath, "rb") != 0)
|
|
return DRMP3_FALSE;
|
|
#else
|
|
pFile = fopen(filePath, "rb");
|
|
if (pFile == NULL)
|
|
return DRMP3_FALSE;
|
|
#endif
|
|
|
|
return drmp3_init(pMP3, drmp3__on_read_stdio, drmp3__on_seek_stdio, (void*)pFile, pConfig);
|
|
}
|
|
#endif
|
|
|
|
void drmp3_uninit(drmp3* pMP3)
|
|
{
|
|
if (pMP3 == NULL) return;
|
|
|
|
#ifndef DR_MP3_NO_STDIO
|
|
if (pMP3->onRead == drmp3__on_read_stdio)
|
|
fclose((FILE*)pMP3->pUserData);
|
|
#endif
|
|
|
|
drmp3_free(pMP3->pData);
|
|
}
|
|
|
|
drmp3_uint64 drmp3_read_f32(drmp3* pMP3, drmp3_uint64 framesToRead, float* pBufferOut)
|
|
{
|
|
drmp3_uint64 totalFramesRead = 0;
|
|
if (pMP3 == NULL || pMP3->onRead == NULL) return 0;
|
|
|
|
if (pBufferOut == NULL)
|
|
{
|
|
float temp[4096];
|
|
while (framesToRead > 0)
|
|
{
|
|
drmp3_uint64 framesJustRead;
|
|
drmp3_uint64 framesToReadRightNow = sizeof(temp)/sizeof(temp[0]) / pMP3->channels;
|
|
if (framesToReadRightNow > framesToRead)
|
|
framesToReadRightNow = framesToRead;
|
|
|
|
framesJustRead = drmp3_read_f32(pMP3, framesToReadRightNow, temp);
|
|
if (framesJustRead == 0)
|
|
break;
|
|
|
|
framesToRead -= framesJustRead;
|
|
totalFramesRead += framesJustRead;
|
|
}
|
|
} else {
|
|
totalFramesRead = drmp3_src_read_frames_ex(&pMP3->src, framesToRead, pBufferOut, DRMP3_TRUE);
|
|
}
|
|
|
|
return totalFramesRead;
|
|
}
|
|
|
|
drmp3_bool32 drmp3_seek_to_frame(drmp3* pMP3, drmp3_uint64 frameIndex)
|
|
{
|
|
drmp3_uint64 framesRead;
|
|
|
|
if (pMP3 == NULL || pMP3->onSeek == NULL) return DRMP3_FALSE;
|
|
|
|
/* Seek to the start of the stream to begin with. */
|
|
if (!pMP3->onSeek(pMP3->pUserData, 0, drmp3_seek_origin_start))
|
|
return DRMP3_FALSE;
|
|
|
|
/* Clear any cached data. */
|
|
pMP3->framesConsumed = 0;
|
|
pMP3->framesRemaining = 0;
|
|
pMP3->dataSize = 0;
|
|
pMP3->atEnd = DRMP3_FALSE;
|
|
|
|
/* TODO: Optimize.
|
|
*
|
|
* This is inefficient. We simply read frames from the start of the stream. */
|
|
framesRead = drmp3_read_f32(pMP3, frameIndex, NULL);
|
|
if (framesRead != frameIndex)
|
|
return DRMP3_FALSE;
|
|
|
|
return DRMP3_TRUE;
|
|
}
|
|
|
|
|
|
|
|
float* drmp3__full_decode_and_close_f32(drmp3* pMP3, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount)
|
|
{
|
|
drmp3_uint64 totalFramesRead = 0;
|
|
drmp3_uint64 framesCapacity = 0;
|
|
float* pFrames = NULL;
|
|
|
|
float temp[4096];
|
|
|
|
drmp3_assert(pMP3 != NULL);
|
|
|
|
for (;;)
|
|
{
|
|
drmp3_uint64 framesToReadRightNow = drmp3_countof(temp) / pMP3->channels;
|
|
drmp3_uint64 framesJustRead = drmp3_read_f32(pMP3, framesToReadRightNow, temp);
|
|
if (framesJustRead == 0)
|
|
break;
|
|
|
|
/* Reallocate the output buffer if there's not enough room. */
|
|
if (framesCapacity < totalFramesRead + framesJustRead)
|
|
{
|
|
float* pNewFrames;
|
|
drmp3_uint64 newFramesBufferSize;
|
|
|
|
framesCapacity *= 2;
|
|
if (framesCapacity < totalFramesRead + framesJustRead)
|
|
framesCapacity = totalFramesRead + framesJustRead;
|
|
|
|
newFramesBufferSize = framesCapacity*pMP3->channels*sizeof(float);
|
|
if (newFramesBufferSize > SIZE_MAX)
|
|
break;
|
|
|
|
pNewFrames = (float*)drmp3_realloc(pFrames, (size_t)newFramesBufferSize);
|
|
if (pNewFrames == NULL)
|
|
{
|
|
drmp3_free(pFrames);
|
|
break;
|
|
}
|
|
|
|
pFrames = pNewFrames;
|
|
}
|
|
|
|
drmp3_copy_memory(pFrames + totalFramesRead*pMP3->channels, temp, (size_t)(framesJustRead*pMP3->channels*sizeof(float)));
|
|
totalFramesRead += framesJustRead;
|
|
|
|
/* If the number of frames we asked for is less that what we actually read it means we've reached the end. */
|
|
if (framesJustRead != framesToReadRightNow)
|
|
break;
|
|
}
|
|
|
|
if (pConfig != NULL)
|
|
{
|
|
pConfig->outputChannels = pMP3->channels;
|
|
pConfig->outputSampleRate = pMP3->sampleRate;
|
|
}
|
|
|
|
drmp3_uninit(pMP3);
|
|
|
|
if (pTotalFrameCount) *pTotalFrameCount = totalFramesRead;
|
|
return pFrames;
|
|
}
|
|
|
|
float* drmp3_open_and_decode_f32(drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount)
|
|
{
|
|
drmp3 mp3;
|
|
if (!drmp3_init(&mp3, onRead, onSeek, pUserData, pConfig))
|
|
return NULL;
|
|
|
|
return drmp3__full_decode_and_close_f32(&mp3, pConfig, pTotalFrameCount);
|
|
}
|
|
|
|
float* drmp3_open_and_decode_memory_f32(const void* pData, size_t dataSize, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount)
|
|
{
|
|
drmp3 mp3;
|
|
if (!drmp3_init_memory(&mp3, pData, dataSize, pConfig))
|
|
return NULL;
|
|
|
|
return drmp3__full_decode_and_close_f32(&mp3, pConfig, pTotalFrameCount);
|
|
}
|
|
|
|
#ifndef DR_MP3_NO_STDIO
|
|
float* drmp3_open_and_decode_file_f32(const char* filePath, drmp3_config* pConfig, drmp3_uint64* pTotalFrameCount)
|
|
{
|
|
drmp3 mp3;
|
|
if (!drmp3_init_file(&mp3, filePath, pConfig))
|
|
return NULL;
|
|
|
|
return drmp3__full_decode_and_close_f32(&mp3, pConfig, pTotalFrameCount);
|
|
}
|
|
#endif
|
|
|
|
void drmp3_free(void* p)
|
|
{
|
|
DRMP3_FREE(p);
|
|
}
|
|
|
|
#endif /*DR_MP3_IMPLEMENTATION*/
|
|
|
|
/*
|
|
This is free and unencumbered software released into the public domain.
|
|
|
|
Anyone is free to copy, modify, publish, use, compile, sell, or
|
|
distribute this software, either in source code form or as a compiled
|
|
binary, for any purpose, commercial or non-commercial, and by any
|
|
means.
|
|
|
|
In jurisdictions that recognize copyright laws, the author or authors
|
|
of this software dedicate any and all copyright interest in the
|
|
software to the public domain. We make this dedication for the benefit
|
|
of the public at large and to the detriment of our heirs and
|
|
successors. We intend this dedication to be an overt act of
|
|
relinquishment in perpetuity of all present and future rights to this
|
|
software under copyright law.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
|
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
|
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
For more information, please refer to <http://unlicense.org/>
|
|
*/
|
|
|
|
/*
|
|
https://github.com/lieff/minimp3
|
|
To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide.
|
|
This software is distributed without any warranty.
|
|
See <http://creativecommons.org/publicdomain/zero/1.0/>.
|
|
*/
|