mpeg4audio.c File Reference

#include "get_bits.h"
#include "put_bits.h"
#include "mpeg4audio.h"

Go to the source code of this file.

Functions
static int	parse_config_ALS (GetBitContext *gb, MPEG4AudioConfig *c)
	Parse MPEG-4 audio configuration for ALS object type. More...
static int	get_object_type (GetBitContext *gb)
static int	get_sample_rate (GetBitContext *gb, int *index)
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...

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

Function Documentation

static int parse_config_ALS ( GetBitContext *  gb, MPEG4AudioConfig *  c  )

static

Parse MPEG-4 audio configuration for ALS object type.

Parameters

[in]	gb	bit reader context
[in]	c	MPEG4AudioConfig structure to fill

Returns

on success 0 is returned, otherwise a value < 0

Definition at line 33 of file mpeg4audio.c.

Referenced by ff_mpeg4audio_get_config_gb().

static int get_object_type ( GetBitContext *  gb )

inlinestatic

Definition at line 71 of file mpeg4audio.c.

Referenced by ff_mpeg4audio_get_config_gb().

static int get_sample_rate ( GetBitContext *  gb, int *  index  )

inlinestatic

Definition at line 79 of file mpeg4audio.c.

Referenced by 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().

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

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

Definition at line 155 of file mpeg4audio.c.

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

Variable Documentation

const int avpriv_mpeg4audio_sample_rates[16]

Initial value:

= {
    96000, 88200, 64000, 48000, 44100, 32000,
    24000, 22050, 16000, 12000, 11025, 8000, 7350
}

Definition at line 62 of file mpeg4audio.c.

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

const uint8_t ff_mpeg4audio_channels[8]

Initial value:

= {
    0, 1, 2, 3, 4, 5, 6, 8
}

Definition at line 67 of file mpeg4audio.c.

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