external/srs
1
0
Fork 0
mirror of https://github.com/ossrs/srs.git synced 2025-03-09 15:49:59 +00:00
Code Issues Releases Wiki Activity
srs/trunk/3rdparty/ffmpeg-4-fit/libavcodec/mpeg4audio.h
winlin 27712fdda7 Rename ffmpeg-4.2-fit to ffmpeg-4-fit
2021-03-04 14:14:06 +08:00

162 lines
7.9 KiB
C
Raw Blame History

/*
* MPEG-4 Audio common header
* Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
*
* 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_MPEG4AUDIO_H
#define AVCODEC_MPEG4AUDIO_H
#include <stdint.h>
#include "libavutil/attributes.h"
#include "get_bits.h"
#include "internal.h"
#include "put_bits.h"
typedef struct MPEG4AudioConfig {
int object_type;
int sampling_index;
int sample_rate;
int chan_config;
int sbr; ///< -1 implicit, 1 presence
int ext_object_type;
int ext_sampling_index;
int ext_sample_rate;
int ext_chan_config;
int channels;
int ps; ///< -1 implicit, 1 presence
int frame_length_short;
} MPEG4AudioConfig;
extern av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16];
extern const uint8_t ff_mpeg4audio_channels[8];
/**
* Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration.
* @param[in] c MPEG4AudioConfig structure to fill.
* @param[in] gb Extradata from container.
* @param[in] sync_extension look for a sync extension after config if true.
* @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
*/
int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
int sync_extension);
/**
* Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
* @param[in] c MPEG4AudioConfig structure to fill.
* @param[in] buf Extradata from container.
* @param[in] bit_size Extradata size in bits.
* @param[in] sync_extension look for a sync extension after config if true.
* @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
*/
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
int bit_size, int sync_extension);
enum AudioObjectType {
AOT_NULL,
// Support? Name
AOT_AAC_MAIN, ///< Y Main
AOT_AAC_LC, ///< Y Low Complexity
AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate
AOT_AAC_LTP, ///< Y Long Term Prediction
AOT_SBR, ///< Y Spectral Band Replication
AOT_AAC_SCALABLE, ///< N Scalable
AOT_TWINVQ, ///< N Twin Vector Quantizer
AOT_CELP, ///< N Code Excited Linear Prediction
AOT_HVXC, ///< N Harmonic Vector eXcitation Coding
AOT_TTSI = 12, ///< N Text-To-Speech Interface
AOT_MAINSYNTH, ///< N Main Synthesis
AOT_WAVESYNTH, ///< N Wavetable Synthesis
AOT_MIDI, ///< N General MIDI
AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects
AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity
AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction
AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable
AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer
AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding
AOT_ER_AAC_LD, ///< N Error Resilient Low Delay
AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction
AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding
AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise
AOT_ER_PARAM, ///< N Error Resilient Parametric
AOT_SSC, ///< N SinuSoidal Coding
AOT_PS, ///< N Parametric Stereo
AOT_SURROUND, ///< N MPEG Surround
AOT_ESCAPE, ///< Y Escape Value
AOT_L1, ///< Y Layer 1
AOT_L2, ///< Y Layer 2
AOT_L3, ///< Y Layer 3
AOT_DST, ///< N Direct Stream Transfer
AOT_ALS, ///< Y Audio LosslesS
AOT_SLS, ///< N Scalable LosslesS
AOT_SLS_NON_CORE, ///< N Scalable LosslesS (non core)
AOT_ER_AAC_ELD, ///< N Error Resilient Enhanced Low Delay
AOT_SMR_SIMPLE, ///< N Symbolic Music Representation Simple
AOT_SMR_MAIN, ///< N Symbolic Music Representation Main
AOT_USAC_NOSBR, ///< N Unified Speech and Audio Coding (no SBR)
AOT_SAOC, ///< N Spatial Audio Object Coding
AOT_LD_SURROUND, ///< N Low Delay MPEG Surround
AOT_USAC, ///< N Unified Speech and Audio Coding
};
#define MAX_PCE_SIZE 320 ///<Maximum size of a PCE including the 3-bit ID_PCE
///<marker and the comment
static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,
GetBitContext *gb,
int bits)
{
unsigned int el = get_bits(gb, bits);
put_bits(pb, bits, el);
return el;
}
static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
{
int five_bit_ch, four_bit_ch, comment_size, bits;
int offset = put_bits_count(pb);
ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency
five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front
five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE
four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown
ff_pce_copy_bits(pb, gb, 4);
if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown
ff_pce_copy_bits(pb, gb, 4);
if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown
ff_pce_copy_bits(pb, gb, 3);
for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
ff_pce_copy_bits(pb, gb, 16);
if (bits)
ff_pce_copy_bits(pb, gb, bits);
avpriv_align_put_bits(pb);
align_get_bits(gb);
comment_size = ff_pce_copy_bits(pb, gb, 8);
for (; comment_size > 0; comment_size--)
ff_pce_copy_bits(pb, gb, 8);
return put_bits_count(pb) - offset;
}
#endif /* AVCODEC_MPEG4AUDIO_H */
Reference in a new issue View git blame Copy permalink