FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Functions | Variables
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 avpriv_mpeg4audio_get_config (MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
 Parse MPEG-4 systems extradata to retrieve audio configuration. More...
 
static av_always_inline
unsigned int 
copy_bits (PutBitContext *pb, GetBitContext *gb, int bits)
 
int avpriv_copy_pce_data (PutBitContext *pb, GetBitContext *gb)
 

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]gbbit reader context
[in]cMPEG4AudioConfig structure to fill
Returns
on success 0 is returned, otherwise a value < 0

Definition at line 33 of file mpeg4audio.c.

Referenced by avpriv_mpeg4audio_get_config().

static int get_object_type ( GetBitContext gb)
inlinestatic

Definition at line 71 of file mpeg4audio.c.

Referenced by avpriv_mpeg4audio_get_config().

static int get_sample_rate ( GetBitContext gb,
int index 
)
inlinestatic

Definition at line 79 of file mpeg4audio.c.

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

Definition at line 86 of file mpeg4audio.c.

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

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

Definition at line 163 of file mpeg4audio.c.

Referenced by avpriv_copy_pce_data().

int avpriv_copy_pce_data ( PutBitContext pb,
GetBitContext gb 
)

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(), avpriv_aac_parse_header(), 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 avpriv_mpeg4audio_get_config().