FFmpeg
Data Structures | Macros | Enumerations | Functions | Variables
mpeg4audio.h File Reference
#include <stdint.h>
#include "libavutil/attributes.h"
#include "get_bits.h"
#include "internal.h"
#include "put_bits.h"

Go to the source code of this file.

Data Structures

struct  MPEG4AudioConfig
 

Macros

#define MAX_PCE_SIZE   320
 Maximum size of a PCE including the 3-bit ID_PCE. More...
 

Enumerations

enum  AudioObjectType {
  AOT_NULL, AOT_AAC_MAIN, AOT_AAC_LC, AOT_AAC_SSR,
  AOT_AAC_LTP, AOT_SBR, AOT_AAC_SCALABLE, AOT_TWINVQ,
  AOT_CELP, AOT_HVXC, AOT_TTSI = 12, AOT_MAINSYNTH,
  AOT_WAVESYNTH, AOT_MIDI, AOT_SAFX, AOT_ER_AAC_LC,
  AOT_ER_AAC_LTP = 19, AOT_ER_AAC_SCALABLE, AOT_ER_TWINVQ, AOT_ER_BSAC,
  AOT_ER_AAC_LD, AOT_ER_CELP, AOT_ER_HVXC, AOT_ER_HILN,
  AOT_ER_PARAM, AOT_SSC, AOT_PS, AOT_SURROUND,
  AOT_ESCAPE, AOT_L1, AOT_L2, AOT_L3,
  AOT_DST, AOT_ALS, AOT_SLS, AOT_SLS_NON_CORE,
  AOT_ER_AAC_ELD, AOT_SMR_SIMPLE, AOT_SMR_MAIN, AOT_USAC_NOSBR,
  AOT_SAOC, AOT_LD_SURROUND, AOT_USAC
}
 

Functions

int ff_mpeg4audio_get_config_gb (MPEG4AudioConfig *c, GetBitContext *gb, int sync_extension, void *logctx)
 Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration. More...
 
int avpriv_mpeg4audio_get_config (MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
 Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. More...
 
int avpriv_mpeg4audio_get_config2 (MPEG4AudioConfig *c, const uint8_t *buf, int size, int sync_extension, void *logctx)
 Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. More...
 
static av_always_inline unsigned int ff_pce_copy_bits (PutBitContext *pb, GetBitContext *gb, int bits)
 
static int ff_copy_pce_data (PutBitContext *pb, GetBitContext *gb)
 

Variables

av_export_avcodec const int avpriv_mpeg4audio_sample_rates [16]
 
const uint8_t ff_mpeg4audio_channels [8]
 

Macro Definition Documentation

#define MAX_PCE_SIZE   320

Maximum size of a PCE including the 3-bit ID_PCE.

marker and the comment

Definition at line 134 of file mpeg4audio.h.

Referenced by aac_adtstoasc_filter(), adts_decode_extradata(), mkv_check_new_extra_data(), and mkv_write_native_codecprivate().

Enumeration Type Documentation

Enumerator
AOT_NULL 
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 

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 

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.

Definition at line 87 of file mpeg4audio.h.

Function Documentation

int ff_mpeg4audio_get_config_gb ( MPEG4AudioConfig c,
GetBitContext gb,
int  sync_extension,
void logctx 
)

Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration.

Parameters
[in]cMPEG4AudioConfig structure to fill.
[in]gbExtradata from container.
[in]sync_extensionlook for a sync extension after config if true.
[in]logctxopaque struct starting with an AVClass element, used for logging.
Returns
negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.

Definition at line 86 of file mpeg4audio.c.

Referenced by avpriv_mpeg4audio_get_config(), avpriv_mpeg4audio_get_config2(), and decode_audio_specific_config_gb().

int avpriv_mpeg4audio_get_config ( MPEG4AudioConfig c,
const uint8_t buf,
int  bit_size,
int  sync_extension 
)

Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.

Parameters
[in]cMPEG4AudioConfig structure to fill.
[in]bufExtradata from container.
[in]bit_sizeExtradata size in bits.
[in]sync_extensionlook for a sync extension after config if true.
Returns
negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.

Definition at line 160 of file mpeg4audio.c.

int avpriv_mpeg4audio_get_config2 ( MPEG4AudioConfig c,
const uint8_t buf,
int  size,
int  sync_extension,
void logctx 
)

Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.

Parameters
[in]cMPEG4AudioConfig structure to fill.
[in]bufExtradata from container.
[in]sizeExtradata size in bytes.
[in]sync_extensionlook for a sync extension after config if true.
[in]logctxopaque struct starting with an AVClass element, used for logging.
Returns
negative AVERROR code on error, AudioSpecificConfig bit index in extradata on success.

Definition at line 177 of file mpeg4audio.c.

Referenced by aac_adtstoasc_init(), adts_decode_extradata(), ff_mp4_read_dec_config_descr(), flush(), get_aac_sample_rates(), latm_decode_extradata(), and read_specific_config().

static av_always_inline unsigned int ff_pce_copy_bits ( PutBitContext pb,
GetBitContext gb,
int  bits 
)
static

Definition at line 137 of file mpeg4audio.h.

Referenced by ff_copy_pce_data().

static int ff_copy_pce_data ( PutBitContext pb,
GetBitContext gb 
)
inlinestatic

Variable Documentation

av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16]
const uint8_t ff_mpeg4audio_channels[8]

Definition at line 67 of file mpeg4audio.c.

Referenced by aac_decode_init(), aac_sync(), ff_mpeg4audio_get_config_gb(), and flush().