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
const av_export_avcodec int	avpriv_mpeg4audio_sample_rates [16]
const uint8_t	ff_mpeg4audio_channels [14]

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 134 of file mpeg4audio.h.

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 87 of file mpeg4audio.h.

Function Documentation

ff_mpeg4audio_get_config_gb()

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]	c	MPEG4AudioConfig structure to fill.
[in]	gb	Extradata from container.
[in]	sync_extension	look for a sync extension after config if true.
[in]	logctx	opaque 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 99 of file mpeg4audio.c.

Referenced by avpriv_mpeg4audio_get_config(), avpriv_mpeg4audio_get_config2(), 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.

Returns

negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.

Definition at line 173 of file mpeg4audio.c.

avpriv_mpeg4audio_get_config2()

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]	c	MPEG4AudioConfig structure to fill.
[in]	buf	Extradata from container.
[in]	size	Extradata size in bytes.
[in]	sync_extension	look for a sync extension after config if true.
[in]	logctx	opaque 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 190 of file mpeg4audio.c.

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

ff_pce_copy_bits()

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().

ff_copy_pce_data()

static int ff_copy_pce_data ( PutBitContext *  pb, GetBitContext *  gb  )

inlinestatic

Definition at line 146 of file mpeg4audio.h.

Referenced by aac_adtstoasc_filter(), adts_decode_extradata(), and latm_write_frame_header().

Variable Documentation

avpriv_mpeg4audio_sample_rates

const av_export_avcodec int avpriv_mpeg4audio_sample_rates[16]

Definition at line 62 of file mpeg4audio.c.

Referenced by aac_encode_init(), ff_adts_header_parse(), and get_sample_rate().

ff_mpeg4audio_channels

const uint8_t ff_mpeg4audio_channels[14]

Definition at line 67 of file mpeg4audio.c.

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