#include <stdint.h>
#include "libavutil/attributes.h"
#include "get_bits.h"
#include "internal.h"
#include "put_bits.h"

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)
	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...

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

◆ MAX_PCE_SIZE

#define MAX_PCE_SIZE 320

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

marker and the comment

Definition at line 119 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

◆ AudioObjectType

enum AudioObjectType

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 72 of file mpeg4audio.h.

Function Documentation

◆ ff_mpeg4audio_get_config_gb()

int ff_mpeg4audio_get_config_gb	(	MPEG4AudioConfig *	c,
		GetBitContext *	gb,
		int	sync_extension
	)

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

Parameters

[in]	c	MPEG4AudioConfig structure to fill.
[in]	gb	Extradata from container.
[in]	sync_extension	look for a sync extension after config if true.

Returns: On error -1 is returned, on success AudioSpecificConfig bit index in extradata.

Definition at line 86 of file mpeg4audio.c.

Referenced by avpriv_mpeg4audio_get_config(), and decode_audio_specific_config_gb().

◆ avpriv_mpeg4audio_get_config()

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]	c	MPEG4AudioConfig structure to fill.
[in]	buf	Extradata from container.
[in]	bit_size	Extradata size in bits.
[in]	sync_extension	look for a sync extension after config if true.