mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-07 03:07:48 +00:00
d4a50a2100
Merged-by: Michael Niedermayer <michaelni@gmx.at>
211 lines
6.0 KiB
C
211 lines
6.0 KiB
C
/*
|
|
* copyright (c) 2001 Fabrice Bellard
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* mpeg audio declarations for both encoder and decoder.
|
|
*/
|
|
|
|
#ifndef AVCODEC_MPEGAUDIO_H
|
|
#define AVCODEC_MPEGAUDIO_H
|
|
|
|
#ifndef CONFIG_FLOAT
|
|
# define CONFIG_FLOAT 0
|
|
#endif
|
|
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "dsputil.h"
|
|
#include "dct.h"
|
|
|
|
#define CONFIG_AUDIO_NONSHORT 0
|
|
|
|
/* max frame size, in samples */
|
|
#define MPA_FRAME_SIZE 1152
|
|
|
|
/* max compressed frame size */
|
|
#define MPA_MAX_CODED_FRAME_SIZE 1792
|
|
|
|
#define MPA_MAX_CHANNELS 2
|
|
|
|
#define SBLIMIT 32 /* number of subbands */
|
|
|
|
#define MPA_STEREO 0
|
|
#define MPA_JSTEREO 1
|
|
#define MPA_DUAL 2
|
|
#define MPA_MONO 3
|
|
|
|
/* header + layer + bitrate + freq + lsf/mpeg25 */
|
|
#define SAME_HEADER_MASK \
|
|
(0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
|
|
|
|
#define MP3_MASK 0xFFFE0CCF
|
|
|
|
#if CONFIG_MPEGAUDIO_HP
|
|
#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
|
|
#define WFRAC_BITS 16 /* fractional bits for window */
|
|
#else
|
|
#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */
|
|
#define WFRAC_BITS 14 /* fractional bits for window */
|
|
#endif
|
|
|
|
#define FRAC_ONE (1 << FRAC_BITS)
|
|
|
|
#define FIX(a) ((int)((a) * FRAC_ONE))
|
|
|
|
#if CONFIG_FLOAT
|
|
typedef float OUT_INT;
|
|
#define OUT_FMT AV_SAMPLE_FMT_FLT
|
|
#elif CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT
|
|
typedef int32_t OUT_INT;
|
|
#define OUT_MAX INT32_MAX
|
|
#define OUT_MIN INT32_MIN
|
|
#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31)
|
|
#define OUT_FMT AV_SAMPLE_FMT_S32
|
|
#else
|
|
typedef int16_t OUT_INT;
|
|
#define OUT_MAX INT16_MAX
|
|
#define OUT_MIN INT16_MIN
|
|
#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
|
|
#define OUT_FMT AV_SAMPLE_FMT_S16
|
|
#endif
|
|
|
|
#if CONFIG_FLOAT
|
|
# define INTFLOAT float
|
|
typedef float MPA_INT;
|
|
#elif FRAC_BITS <= 15
|
|
# define INTFLOAT int
|
|
typedef int16_t MPA_INT;
|
|
#else
|
|
# define INTFLOAT int
|
|
typedef int32_t MPA_INT;
|
|
#endif
|
|
|
|
#define BACKSTEP_SIZE 512
|
|
#define EXTRABYTES 24
|
|
|
|
/* layer 3 "granule" */
|
|
typedef struct GranuleDef {
|
|
uint8_t scfsi;
|
|
int part2_3_length;
|
|
int big_values;
|
|
int global_gain;
|
|
int scalefac_compress;
|
|
uint8_t block_type;
|
|
uint8_t switch_point;
|
|
int table_select[3];
|
|
int subblock_gain[3];
|
|
uint8_t scalefac_scale;
|
|
uint8_t count1table_select;
|
|
int region_size[3]; /* number of huffman codes in each region */
|
|
int preflag;
|
|
int short_start, long_end; /* long/short band indexes */
|
|
uint8_t scale_factors[40];
|
|
INTFLOAT sb_hybrid[SBLIMIT * 18]; /* 576 samples */
|
|
} GranuleDef;
|
|
|
|
#define MPA_DECODE_HEADER \
|
|
int frame_size; \
|
|
int error_protection; \
|
|
int layer; \
|
|
int sample_rate; \
|
|
int sample_rate_index; /* between 0 and 8 */ \
|
|
int bit_rate; \
|
|
int nb_channels; \
|
|
int mode; \
|
|
int mode_ext; \
|
|
int lsf;
|
|
|
|
typedef struct MPADecodeHeader {
|
|
MPA_DECODE_HEADER
|
|
} MPADecodeHeader;
|
|
|
|
typedef struct MPADecodeContext {
|
|
MPA_DECODE_HEADER
|
|
uint8_t last_buf[2*BACKSTEP_SIZE + EXTRABYTES];
|
|
int last_buf_size;
|
|
/* next header (used in free format parsing) */
|
|
uint32_t free_format_next_header;
|
|
GetBitContext gb;
|
|
GetBitContext in_gb;
|
|
DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2];
|
|
int synth_buf_offset[MPA_MAX_CHANNELS];
|
|
DECLARE_ALIGNED(16, INTFLOAT, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
|
|
INTFLOAT mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
|
|
GranuleDef granules[2][2]; /* Used in Layer 3 */
|
|
#ifdef DEBUG
|
|
int frame_count;
|
|
#endif
|
|
int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
|
|
int dither_state;
|
|
int error_recognition;
|
|
AVCodecContext* avctx;
|
|
#if CONFIG_FLOAT
|
|
DCTContext dct;
|
|
#endif
|
|
void (*apply_window_mp3)(MPA_INT *synth_buf, MPA_INT *window,
|
|
int *dither_state, OUT_INT *samples, int incr);
|
|
} MPADecodeContext;
|
|
|
|
/* layer 3 huffman tables */
|
|
typedef struct HuffTable {
|
|
int xsize;
|
|
const uint8_t *bits;
|
|
const uint16_t *codes;
|
|
} HuffTable;
|
|
|
|
int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
|
|
int ff_mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate, int *channels, int *frame_size, int *bitrate);
|
|
extern MPA_INT ff_mpa_synth_window[];
|
|
void ff_mpa_synth_init(MPA_INT *window);
|
|
void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
|
|
MPA_INT *window, int *dither_state,
|
|
OUT_INT *samples, int incr,
|
|
INTFLOAT sb_samples[SBLIMIT]);
|
|
|
|
void ff_mpa_synth_init_float(MPA_INT *window);
|
|
void ff_mpa_synth_filter_float(MPADecodeContext *s,
|
|
MPA_INT *synth_buf_ptr, int *synth_buf_offset,
|
|
MPA_INT *window, int *dither_state,
|
|
OUT_INT *samples, int incr,
|
|
INTFLOAT sb_samples[SBLIMIT]);
|
|
|
|
void ff_mpegaudiodec_init_mmx(MPADecodeContext *s);
|
|
void ff_mpegaudiodec_init_altivec(MPADecodeContext *s);
|
|
|
|
/* fast header check for resync */
|
|
static inline int ff_mpa_check_header(uint32_t header){
|
|
/* header */
|
|
if ((header & 0xffe00000) != 0xffe00000)
|
|
return -1;
|
|
/* layer check */
|
|
if ((header & (3<<17)) == 0)
|
|
return -1;
|
|
/* bit rate */
|
|
if ((header & (0xf<<12)) == 0xf<<12)
|
|
return -1;
|
|
/* frequency */
|
|
if ((header & (3<<10)) == 3<<10)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
#endif /* AVCODEC_MPEGAUDIO_H */
|