mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 03:39:45 +00:00
128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*
|
|
* MLP codec common header file
|
|
* Copyright (c) 2007-2008 Ian Caulfield
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVCODEC_MLP_H
|
|
#define AVCODEC_MLP_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "avcodec.h"
|
|
|
|
/** Last possible matrix channel for each codec */
|
|
#define MAX_MATRIX_CHANNEL_MLP 5
|
|
#define MAX_MATRIX_CHANNEL_TRUEHD 7
|
|
/** Maximum number of channels in a valid stream.
|
|
* MLP : 5.1 + 2 noise channels -> 8 channels
|
|
* TrueHD: 7.1 -> 8 channels
|
|
*/
|
|
#define MAX_CHANNELS 8
|
|
|
|
/** Maximum number of matrices used in decoding; most streams have one matrix
|
|
* per output channel, but some rematrix a channel (usually 0) more than once.
|
|
*/
|
|
#define MAX_MATRICES_MLP 6
|
|
#define MAX_MATRICES_TRUEHD 8
|
|
#define MAX_MATRICES 8
|
|
|
|
/** Maximum number of substreams that can be decoded.
|
|
* MLP's limit is 2. TrueHD supports at least up to 3.
|
|
*/
|
|
#define MAX_SUBSTREAMS 3
|
|
|
|
/** which multiple of 48000 the maximum sample rate is */
|
|
#define MAX_RATEFACTOR 4
|
|
/** maximum sample frequency seen in files */
|
|
#define MAX_SAMPLERATE (MAX_RATEFACTOR * 48000)
|
|
|
|
/** maximum number of audio samples within one access unit */
|
|
#define MAX_BLOCKSIZE (40 * MAX_RATEFACTOR)
|
|
/** next power of two greater than MAX_BLOCKSIZE */
|
|
#define MAX_BLOCKSIZE_POW2 (64 * MAX_RATEFACTOR)
|
|
|
|
/** number of allowed filters */
|
|
#define NUM_FILTERS 2
|
|
|
|
/** The maximum number of taps in IIR and FIR filters. */
|
|
#define MAX_FIR_ORDER 8
|
|
#define MAX_IIR_ORDER 4
|
|
|
|
/** Code that signals end of a stream. */
|
|
#define END_OF_STREAM 0xd234d234
|
|
|
|
#define FIR 0
|
|
#define IIR 1
|
|
|
|
/** filter data */
|
|
typedef struct {
|
|
uint8_t order; ///< number of taps in filter
|
|
uint8_t shift; ///< Right shift to apply to output of filter.
|
|
|
|
int32_t state[MAX_FIR_ORDER];
|
|
} FilterParams;
|
|
|
|
/** sample data coding information */
|
|
typedef struct {
|
|
FilterParams filter_params[NUM_FILTERS];
|
|
int32_t coeff[NUM_FILTERS][MAX_FIR_ORDER];
|
|
|
|
int16_t huff_offset; ///< Offset to apply to residual values.
|
|
int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset
|
|
uint8_t codebook; ///< Which VLC codebook to use to read residuals.
|
|
uint8_t huff_lsbs; ///< Size of residual suffix not encoded using VLC.
|
|
} ChannelParams;
|
|
|
|
/** Tables defining the Huffman codes.
|
|
* There are three entropy coding methods used in MLP (four if you count
|
|
* "none" as a method). These use the same sequences for codes starting with
|
|
* 00 or 01, but have different codes starting with 1.
|
|
*/
|
|
extern const uint8_t ff_mlp_huffman_tables[3][18][2];
|
|
|
|
/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
|
|
* are not (in implementation terms, the table lookup and XOR are reversed).
|
|
* We can implement this behavior using a standard av_crc on all but the
|
|
* last element, then XOR that with the last element.
|
|
*/
|
|
uint8_t ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size);
|
|
uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size);
|
|
|
|
/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8
|
|
* number of bits, starting two bits into the first byte of buf.
|
|
*/
|
|
uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size);
|
|
|
|
/** XOR together all the bytes of a buffer.
|
|
* Does this belong in dspcontext?
|
|
*/
|
|
uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size);
|
|
|
|
void ff_mlp_init_crc(void);
|
|
|
|
/** XOR four bytes into one. */
|
|
static inline uint8_t xor_32_to_8(uint32_t value)
|
|
{
|
|
value ^= value >> 16;
|
|
value ^= value >> 8;
|
|
return value;
|
|
}
|
|
|
|
#endif /* AVCODEC_MLP_H */
|