Libav 0.7.1
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AAC decoder. More...
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "dsputil.h"
#include "fft.h"
#include "fmtconvert.h"
#include "lpc.h"
#include "kbdwin.h"
#include "sinewin.h"
#include "aac.h"
#include "aactab.h"
#include "aacdectab.h"
#include "cbrt_tablegen.h"
#include "sbr.h"
#include "aacsbr.h"
#include "mpeg4audio.h"
#include "aacadtsdec.h"
#include <assert.h>
#include <errno.h>
#include <math.h>
#include <string.h>
Go to the source code of this file.
Data Structures | |
union | float754 |
struct | LATMContext |
Defines | |
#define | AAC_INIT_VLC_STATIC(num, size) |
#define | LOAS_SYNC_WORD 0x2b7 |
11 bits LOAS sync word | |
Functions | |
static ChannelElement * | get_che (AACContext *ac, int type, int elem_id) |
static av_cold int | che_configure (AACContext *ac, enum ChannelPosition che_pos[4][MAX_ELEM_ID], int type, int id, int *channels) |
Check for the channel element in the current channel position configuration. | |
static av_cold int | output_configure (AACContext *ac, enum ChannelPosition che_pos[4][MAX_ELEM_ID], enum ChannelPosition new_che_pos[4][MAX_ELEM_ID], int channel_config, enum OCStatus oc_type) |
Configure output channel order based on the current program configuration element. | |
static void | decode_channel_map (enum ChannelPosition *cpe_map, enum ChannelPosition *sce_map, enum ChannelPosition type, GetBitContext *gb, int n) |
Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit. | |
static int | decode_pce (AVCodecContext *avctx, MPEG4AudioConfig *m4ac, enum ChannelPosition new_che_pos[4][MAX_ELEM_ID], GetBitContext *gb) |
Decode program configuration element; reference: table 4.2. | |
static av_cold int | set_default_channel_config (AVCodecContext *avctx, enum ChannelPosition new_che_pos[4][MAX_ELEM_ID], int channel_config) |
Set up channel positions based on a default channel configuration as specified in table 1.17. | |
static int | decode_ga_specific_config (AACContext *ac, AVCodecContext *avctx, GetBitContext *gb, MPEG4AudioConfig *m4ac, int channel_config) |
Decode GA "General Audio" specific configuration; reference: table 4.1. | |
static int | decode_audio_specific_config (AACContext *ac, AVCodecContext *avctx, MPEG4AudioConfig *m4ac, const uint8_t *data, int data_size) |
Decode audio specific configuration; reference: table 1.13. | |
static av_always_inline int | lcg_random (int previous_val) |
linear congruential pseudorandom number generator | |
static av_always_inline void | reset_predict_state (PredictorState *ps) |
static void | reset_all_predictors (PredictorState *ps) |
static void | reset_predictor_group (PredictorState *ps, int group_num) |
static av_cold int | aac_decode_init (AVCodecContext *avctx) |
static int | skip_data_stream_element (AACContext *ac, GetBitContext *gb) |
Skip data_stream_element; reference: table 4.10. | |
static int | decode_prediction (AACContext *ac, IndividualChannelStream *ics, GetBitContext *gb) |
static void | decode_ltp (AACContext *ac, LongTermPrediction *ltp, GetBitContext *gb, uint8_t max_sfb) |
Decode Long Term Prediction data; reference: table 4.xx. | |
static int | decode_ics_info (AACContext *ac, IndividualChannelStream *ics, GetBitContext *gb, int common_window) |
Decode Individual Channel Stream info; reference: table 4.6. | |
static int | decode_band_types (AACContext *ac, enum BandType band_type[120], int band_type_run_end[120], GetBitContext *gb, IndividualChannelStream *ics) |
Decode band types (section_data payload); reference: table 4.46. | |
static int | decode_scalefactors (AACContext *ac, float sf[120], GetBitContext *gb, unsigned int global_gain, IndividualChannelStream *ics, enum BandType band_type[120], int band_type_run_end[120]) |
Decode scalefactors; reference: table 4.47. | |
static int | decode_pulses (Pulse *pulse, GetBitContext *gb, const uint16_t *swb_offset, int num_swb) |
Decode pulse data; reference: table 4.7. | |
static int | decode_tns (AACContext *ac, TemporalNoiseShaping *tns, GetBitContext *gb, const IndividualChannelStream *ics) |
Decode Temporal Noise Shaping data; reference: table 4.48. | |
static void | decode_mid_side_stereo (ChannelElement *cpe, GetBitContext *gb, int ms_present) |
Decode Mid/Side data; reference: table 4.54. | |
static float * | VMUL2 (float *dst, const float *v, unsigned idx, const float *scale) |
static float * | VMUL4 (float *dst, const float *v, unsigned idx, const float *scale) |
static float * | VMUL2S (float *dst, const float *v, unsigned idx, unsigned sign, const float *scale) |
static float * | VMUL4S (float *dst, const float *v, unsigned idx, unsigned sign, const float *scale) |
static int | decode_spectrum_and_dequant (AACContext *ac, float coef[1024], GetBitContext *gb, const float sf[120], int pulse_present, const Pulse *pulse, const IndividualChannelStream *ics, enum BandType band_type[120]) |
Decode spectral data; reference: table 4.50. | |
static av_always_inline float | flt16_round (float pf) |
static av_always_inline float | flt16_even (float pf) |
static av_always_inline float | flt16_trunc (float pf) |
static av_always_inline void | predict (PredictorState *ps, float *coef, int output_enable) |
static void | apply_prediction (AACContext *ac, SingleChannelElement *sce) |
Apply AAC-Main style frequency domain prediction. | |
static int | decode_ics (AACContext *ac, SingleChannelElement *sce, GetBitContext *gb, int common_window, int scale_flag) |
Decode an individual_channel_stream payload; reference: table 4.44. | |
static void | apply_mid_side_stereo (AACContext *ac, ChannelElement *cpe) |
Mid/Side stereo decoding; reference: 4.6.8.1.3. | |
static void | apply_intensity_stereo (AACContext *ac, ChannelElement *cpe, int ms_present) |
intensity stereo decoding; reference: 4.6.8.2.3 | |
static int | decode_cpe (AACContext *ac, GetBitContext *gb, ChannelElement *cpe) |
Decode a channel_pair_element; reference: table 4.4. | |
static int | decode_cce (AACContext *ac, GetBitContext *gb, ChannelElement *che) |
Decode coupling_channel_element; reference: table 4.8. | |
static int | decode_drc_channel_exclusions (DynamicRangeControl *che_drc, GetBitContext *gb) |
Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53. | |
static int | decode_dynamic_range (DynamicRangeControl *che_drc, GetBitContext *gb, int cnt) |
Decode dynamic range information; reference: table 4.52. | |
static int | decode_extension_payload (AACContext *ac, GetBitContext *gb, int cnt, ChannelElement *che, enum RawDataBlockType elem_type) |
Decode extension data (incomplete); reference: table 4.51. | |
static void | apply_tns (float coef[1024], TemporalNoiseShaping *tns, IndividualChannelStream *ics, int decode) |
Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3. | |
static void | windowing_and_mdct_ltp (AACContext *ac, float *out, float *in, IndividualChannelStream *ics) |
Apply windowing and MDCT to obtain the spectral coefficient from the predicted sample by LTP. | |
static void | apply_ltp (AACContext *ac, SingleChannelElement *sce) |
Apply the long term prediction. | |
static void | update_ltp (AACContext *ac, SingleChannelElement *sce) |
Update the LTP buffer for next frame. | |
static void | imdct_and_windowing (AACContext *ac, SingleChannelElement *sce) |
Conduct IMDCT and windowing. | |
static void | apply_dependent_coupling (AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index) |
Apply dependent channel coupling (applied before IMDCT). | |
static void | apply_independent_coupling (AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index) |
Apply independent channel coupling (applied after IMDCT). | |
static void | apply_channel_coupling (AACContext *ac, ChannelElement *cc, enum RawDataBlockType type, int elem_id, enum CouplingPoint coupling_point, void(*apply_coupling_method)(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)) |
channel coupling transformation interface | |
static void | spectral_to_sample (AACContext *ac) |
Convert spectral data to float samples, applying all supported tools as appropriate. | |
static int | parse_adts_frame_header (AACContext *ac, GetBitContext *gb) |
static int | aac_decode_frame_int (AVCodecContext *avctx, void *data, int *data_size, GetBitContext *gb) |
static int | aac_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) |
static av_cold int | aac_decode_close (AVCodecContext *avctx) |
static uint32_t | latm_get_value (GetBitContext *b) |
static int | latm_decode_audio_specific_config (struct LATMContext *latmctx, GetBitContext *gb) |
static int | read_stream_mux_config (struct LATMContext *latmctx, GetBitContext *gb) |
static int | read_payload_length_info (struct LATMContext *ctx, GetBitContext *gb) |
static int | read_audio_mux_element (struct LATMContext *latmctx, GetBitContext *gb) |
static int | latm_decode_frame (AVCodecContext *avctx, void *out, int *out_size, AVPacket *avpkt) |
static av_cold int | latm_decode_init (AVCodecContext *avctx) |
Variables | |
static VLC | vlc_scalefactors |
static VLC | vlc_spectral [11] |
static const char | overread_err [] = "Input buffer exhausted before END element found\n" |
static const float | cce_scale [] |
AVCodec | ff_aac_decoder |
AVCodec | ff_aac_latm_decoder |
AAC decoder.
Definition in file aacdec.c.
#define AAC_INIT_VLC_STATIC | ( | num, | |
size | |||
) |
INIT_VLC_STATIC(&vlc_spectral[num], 8, ff_aac_spectral_sizes[num], \ ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \ ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \ size);
Definition at line 540 of file aacdec.c.
Referenced by aac_decode_init().
#define LOAS_SYNC_WORD 0x2b7 |
static av_cold int aac_decode_close | ( | AVCodecContext * | avctx | ) | [static] |
Definition at line 2229 of file aacdec.c.
Referenced by latm_decode_frame().
static int aac_decode_frame | ( | AVCodecContext * | avctx, |
void * | data, | ||
int * | data_size, | ||
AVPacket * | avpkt | ||
) | [static] |
static int aac_decode_frame_int | ( | AVCodecContext * | avctx, |
void * | data, | ||
int * | data_size, | ||
GetBitContext * | gb | ||
) | [static] |
Definition at line 2071 of file aacdec.c.
Referenced by aac_decode_frame(), and latm_decode_frame().
static av_cold int aac_decode_init | ( | AVCodecContext * | avctx | ) | [static] |
Definition at line 546 of file aacdec.c.
Referenced by latm_decode_frame(), and latm_decode_init().
static void apply_channel_coupling | ( | AACContext * | ac, |
ChannelElement * | cc, | ||
enum RawDataBlockType | type, | ||
int | elem_id, | ||
enum CouplingPoint | coupling_point, | ||
void(*)(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index) | apply_coupling_method | ||
) | [static] |
channel coupling transformation interface
apply_coupling_method | pointer to (in)dependent coupling function |
Definition at line 1957 of file aacdec.c.
Referenced by spectral_to_sample().
static void apply_dependent_coupling | ( | AACContext * | ac, |
SingleChannelElement * | target, | ||
ChannelElement * | cce, | ||
int | index | ||
) | [static] |
Apply dependent channel coupling (applied before IMDCT).
index | index into coupling gain array |
Definition at line 1902 of file aacdec.c.
Referenced by spectral_to_sample().
static void apply_independent_coupling | ( | AACContext * | ac, |
SingleChannelElement * | target, | ||
ChannelElement * | cce, | ||
int | index | ||
) | [static] |
Apply independent channel coupling (applied after IMDCT).
index | index into coupling gain array |
Definition at line 1938 of file aacdec.c.
Referenced by spectral_to_sample().
static void apply_intensity_stereo | ( | AACContext * | ac, |
ChannelElement * | cpe, | ||
int | ms_present | ||
) | [static] |
intensity stereo decoding; reference: 4.6.8.2.3
ms_present | Indicates mid/side stereo presence. [0] mask is all 0s; [1] mask is decoded from bitstream; [2] mask is all 1s; [3] reserved for scalable AAC |
Definition at line 1402 of file aacdec.c.
Referenced by decode_cpe().
static void apply_ltp | ( | AACContext * | ac, |
SingleChannelElement * | sce | ||
) | [static] |
Apply the long term prediction.
Definition at line 1770 of file aacdec.c.
Referenced by spectral_to_sample().
static void apply_mid_side_stereo | ( | AACContext * | ac, |
ChannelElement * | cpe | ||
) | [static] |
Mid/Side stereo decoding; reference: 4.6.8.1.3.
Definition at line 1372 of file aacdec.c.
Referenced by decode_cpe().
static void apply_prediction | ( | AACContext * | ac, |
SingleChannelElement * | sce | ||
) | [static] |
Apply AAC-Main style frequency domain prediction.
Definition at line 1284 of file aacdec.c.
Referenced by decode_cpe(), and decode_ics().
static void apply_tns | ( | float | coef[1024], |
TemporalNoiseShaping * | tns, | ||
IndividualChannelStream * | ics, | ||
int | decode | ||
) | [static] |
Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
decode | 1 if tool is used normally, 0 if tool is used in LTP. |
coef | spectral coefficients |
Definition at line 1688 of file aacdec.c.
Referenced by apply_ltp(), and spectral_to_sample().
static av_cold int che_configure | ( | AACContext * | ac, |
enum ChannelPosition | che_pos[4][MAX_ELEM_ID], | ||
int | type, | ||
int | id, | ||
int * | channels | ||
) | [static] |
Check for the channel element in the current channel position configuration.
If it exists, make sure the appropriate element is allocated and map the channel order to match the internal Libav channel layout.
che_pos | current channel position configuration |
type | channel element type |
id | channel element id |
channels | count of the number of channels in the configuration |
Definition at line 182 of file aacdec.c.
Referenced by output_configure().
static int decode_audio_specific_config | ( | AACContext * | ac, |
AVCodecContext * | avctx, | ||
MPEG4AudioConfig * | m4ac, | ||
const uint8_t * | data, | ||
int | data_size | ||
) | [static] |
Decode audio specific configuration; reference: table 1.13.
ac | pointer to AACContext, may be null |
avctx | pointer to AVCCodecContext, used for logging |
m4ac | pointer to MPEG4AudioConfig, used for parsing |
data | pointer to AVCodecContext extradata |
data_size | size of AVCCodecContext extradata |
Definition at line 458 of file aacdec.c.
Referenced by aac_decode_init(), and latm_decode_audio_specific_config().
static int decode_band_types | ( | AACContext * | ac, |
enum BandType | band_type[120], | ||
int | band_type_run_end[120], | ||
GetBitContext * | gb, | ||
IndividualChannelStream * | ics | ||
) | [static] |
Decode band types (section_data payload); reference: table 4.46.
band_type | array of the used band type |
band_type_run_end | array of the last scalefactor band of a band type run |
Definition at line 739 of file aacdec.c.
Referenced by decode_ics().
static int decode_cce | ( | AACContext * | ac, |
GetBitContext * | gb, | ||
ChannelElement * | che | ||
) | [static] |
Decode coupling_channel_element; reference: table 4.8.
Definition at line 1493 of file aacdec.c.
Referenced by aac_decode_frame_int().
static void decode_channel_map | ( | enum ChannelPosition * | cpe_map, |
enum ChannelPosition * | sce_map, | ||
enum ChannelPosition | type, | ||
GetBitContext * | gb, | ||
int | n | ||
) | [static] |
Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
cpe_map | Stereo (Channel Pair Element) map, NULL if stereo bit is not present. |
sce_map | mono (Single Channel Element) map |
type | speaker type/position for these channels |
Definition at line 272 of file aacdec.c.
Referenced by decode_pce().
static int decode_cpe | ( | AACContext * | ac, |
GetBitContext * | gb, | ||
ChannelElement * | cpe | ||
) | [static] |
Decode a channel_pair_element; reference: table 4.4.
Definition at line 1442 of file aacdec.c.
Referenced by aac_decode_frame_int().
static int decode_drc_channel_exclusions | ( | DynamicRangeControl * | che_drc, |
GetBitContext * | gb | ||
) | [static] |
Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
Definition at line 1565 of file aacdec.c.
Referenced by decode_dynamic_range().
static int decode_dynamic_range | ( | DynamicRangeControl * | che_drc, |
GetBitContext * | gb, | ||
int | cnt | ||
) | [static] |
Decode dynamic range information; reference: table 4.52.
cnt | length of TYPE_FIL syntactic element in bytes |
Definition at line 1586 of file aacdec.c.
Referenced by decode_extension_payload().
static int decode_extension_payload | ( | AACContext * | ac, |
GetBitContext * | gb, | ||
int | cnt, | ||
ChannelElement * | che, | ||
enum RawDataBlockType | elem_type | ||
) | [static] |
Decode extension data (incomplete); reference: table 4.51.
cnt | length of TYPE_FIL syntactic element in bytes |
Definition at line 1640 of file aacdec.c.
Referenced by aac_decode_frame_int().
static int decode_ga_specific_config | ( | AACContext * | ac, |
AVCodecContext * | avctx, | ||
GetBitContext * | gb, | ||
MPEG4AudioConfig * | m4ac, | ||
int | channel_config | ||
) | [static] |
Decode GA "General Audio" specific configuration; reference: table 4.1.
ac | pointer to AACContext, may be null |
avctx | pointer to AVCCodecContext, used for logging |
Definition at line 393 of file aacdec.c.
Referenced by decode_audio_specific_config().
static int decode_ics | ( | AACContext * | ac, |
SingleChannelElement * | sce, | ||
GetBitContext * | gb, | ||
int | common_window, | ||
int | scale_flag | ||
) | [static] |
Decode an individual_channel_stream payload; reference: table 4.44.
common_window | Channels have independent [0], or shared [1], Individual Channel Stream information. |
scale_flag | scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.) |
Definition at line 1314 of file aacdec.c.
Referenced by aac_decode_frame_int(), decode_cce(), and decode_cpe().
static int decode_ics_info | ( | AACContext * | ac, |
IndividualChannelStream * | ics, | ||
GetBitContext * | gb, | ||
int | common_window | ||
) | [static] |
Decode Individual Channel Stream info; reference: table 4.6.
common_window | Channels have independent [0], or shared [1], Individual Channel Stream information. |
Definition at line 665 of file aacdec.c.
Referenced by decode_cpe(), and decode_ics().
static void decode_ltp | ( | AACContext * | ac, |
LongTermPrediction * | ltp, | ||
GetBitContext * | gb, | ||
uint8_t | max_sfb | ||
) | [static] |
Decode Long Term Prediction data; reference: table 4.xx.
Definition at line 649 of file aacdec.c.
Referenced by decode_cpe(), and decode_ics_info().
static void decode_mid_side_stereo | ( | ChannelElement * | cpe, |
GetBitContext * | gb, | ||
int | ms_present | ||
) | [static] |
Decode Mid/Side data; reference: table 4.54.
ms_present | Indicates mid/side stereo presence. [0] mask is all 0s; [1] mask is decoded from bitstream; [2] mask is all 1s; [3] reserved for scalable AAC |
Definition at line 920 of file aacdec.c.
Referenced by decode_cpe().
static int decode_pce | ( | AVCodecContext * | avctx, |
MPEG4AudioConfig * | m4ac, | ||
enum ChannelPosition | new_che_pos[4][MAX_ELEM_ID], | ||
GetBitContext * | gb | ||
) | [static] |
Decode program configuration element; reference: table 4.2.
new_che_pos | New channel position configuration - we only do something if it differs from the current one. |
Definition at line 290 of file aacdec.c.
Referenced by aac_decode_frame_int(), and decode_ga_specific_config().
static int decode_prediction | ( | AACContext * | ac, |
IndividualChannelStream * | ics, | ||
GetBitContext * | gb | ||
) | [static] |
Definition at line 629 of file aacdec.c.
Referenced by decode_ics_info().
static int decode_pulses | ( | Pulse * | pulse, |
GetBitContext * | gb, | ||
const uint16_t * | swb_offset, | ||
int | num_swb | ||
) | [static] |
Decode pulse data; reference: table 4.7.
Definition at line 851 of file aacdec.c.
Referenced by decode_ics().
static int decode_scalefactors | ( | AACContext * | ac, |
float | sf[120], | ||
GetBitContext * | gb, | ||
unsigned int | global_gain, | ||
IndividualChannelStream * | ics, | ||
enum BandType | band_type[120], | ||
int | band_type_run_end[120] | ||
) | [static] |
Decode scalefactors; reference: table 4.47.
global_gain | first scalefactor value as scalefactors are differentially coded |
band_type | array of the used band type |
band_type_run_end | array of the last scalefactor band of a band type run |
sf | array of scalefactors or intensity stereo positions |
Definition at line 788 of file aacdec.c.
Referenced by decode_ics().
static int decode_spectrum_and_dequant | ( | AACContext * | ac, |
float | coef[1024], | ||
GetBitContext * | gb, | ||
const float | sf[120], | ||
int | pulse_present, | ||
const Pulse * | pulse, | ||
const IndividualChannelStream * | ics, | ||
enum BandType | band_type[120] | ||
) | [static] |
Decode spectral data; reference: table 4.50.
Dequantize and scale spectral data; reference: 4.6.3.3.
coef | array of dequantized, scaled spectral data |
sf | array of scalefactors or intensity stereo positions |
pulse_present | set if pulses are present |
pulse | pointer to pulse data struct |
band_type | array of the used band type |
Definition at line 1012 of file aacdec.c.
Referenced by decode_ics().
static int decode_tns | ( | AACContext * | ac, |
TemporalNoiseShaping * | tns, | ||
GetBitContext * | gb, | ||
const IndividualChannelStream * | ics | ||
) | [static] |
Decode Temporal Noise Shaping data; reference: table 4.48.
Definition at line 878 of file aacdec.c.
Referenced by decode_ics().
static av_always_inline float flt16_even | ( | float | pf | ) | [static] |
static av_always_inline float flt16_round | ( | float | pf | ) | [static] |
static av_always_inline float flt16_trunc | ( | float | pf | ) | [static] |
static ChannelElement* get_che | ( | AACContext * | ac, |
int | type, | ||
int | elem_id | ||
) | [static] |
Definition at line 121 of file aacdec.c.
Referenced by aac_decode_frame_int().
static void imdct_and_windowing | ( | AACContext * | ac, |
SingleChannelElement * | sce | ||
) | [static] |
Conduct IMDCT and windowing.
Definition at line 1837 of file aacdec.c.
Referenced by spectral_to_sample().
static int latm_decode_audio_specific_config | ( | struct LATMContext * | latmctx, |
GetBitContext * | gb | ||
) | [static] |
Definition at line 2268 of file aacdec.c.
Referenced by read_stream_mux_config().
static int latm_decode_frame | ( | AVCodecContext * | avctx, |
void * | out, | ||
int * | out_size, | ||
AVPacket * | avpkt | ||
) | [static] |
static av_cold int latm_decode_init | ( | AVCodecContext * | avctx | ) | [static] |
static uint32_t latm_get_value | ( | GetBitContext * | b | ) | [inline, static] |
Definition at line 2261 of file aacdec.c.
Referenced by read_stream_mux_config().
static av_always_inline int lcg_random | ( | int | previous_val | ) | [static] |
linear congruential pseudorandom number generator
previous_val | pointer to the current state of the generator |
Definition at line 511 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
static av_cold int output_configure | ( | AACContext * | ac, |
enum ChannelPosition | che_pos[4][MAX_ELEM_ID], | ||
enum ChannelPosition | new_che_pos[4][MAX_ELEM_ID], | ||
int | channel_config, | ||
enum OCStatus | oc_type | ||
) | [static] |
Configure output channel order based on the current program configuration element.
che_pos | current channel position configuration |
new_che_pos | New channel position configuration - we only do something if it differs from the current one. |
Definition at line 213 of file aacdec.c.
Referenced by aac_decode_frame_int(), decode_extension_payload(), decode_ga_specific_config(), and parse_adts_frame_header().
static int parse_adts_frame_header | ( | AACContext * | ac, |
GetBitContext * | gb | ||
) | [static] |
Definition at line 2033 of file aacdec.c.
Referenced by aac_decode_frame_int().
static av_always_inline void predict | ( | PredictorState * | ps, |
float * | coef, | ||
int | output_enable | ||
) | [static] |
Definition at line 1250 of file aacdec.c.
Referenced by apply_prediction().
static int read_audio_mux_element | ( | struct LATMContext * | latmctx, |
GetBitContext * | gb | ||
) | [static] |
Definition at line 2411 of file aacdec.c.
Referenced by latm_decode_frame().
static int read_payload_length_info | ( | struct LATMContext * | ctx, |
GetBitContext * | gb | ||
) | [static] |
Definition at line 2390 of file aacdec.c.
Referenced by read_audio_mux_element().
static int read_stream_mux_config | ( | struct LATMContext * | latmctx, |
GetBitContext * | gb | ||
) | [static] |
Definition at line 2308 of file aacdec.c.
Referenced by read_audio_mux_element().
static void reset_all_predictors | ( | PredictorState * | ps | ) | [static] |
Definition at line 526 of file aacdec.c.
Referenced by apply_prediction().
static av_always_inline void reset_predict_state | ( | PredictorState * | ps | ) | [static] |
Definition at line 516 of file aacdec.c.
Referenced by reset_all_predictors(), and reset_predictor_group().
static void reset_predictor_group | ( | PredictorState * | ps, |
int | group_num | ||
) | [static] |
Definition at line 533 of file aacdec.c.
Referenced by apply_prediction().
static av_cold int set_default_channel_config | ( | AVCodecContext * | avctx, |
enum ChannelPosition | new_che_pos[4][MAX_ELEM_ID], | ||
int | channel_config | ||
) | [static] |
Set up channel positions based on a default channel configuration as specified in table 1.17.
new_che_pos | New channel position configuration - we only do something if it differs from the current one. |
Definition at line 347 of file aacdec.c.
Referenced by decode_ga_specific_config(), and parse_adts_frame_header().
static int skip_data_stream_element | ( | AACContext * | ac, |
GetBitContext * | gb | ||
) | [static] |
Skip data_stream_element; reference: table 4.10.
Definition at line 612 of file aacdec.c.
Referenced by aac_decode_frame_int().
static void spectral_to_sample | ( | AACContext * | ac | ) | [static] |
Convert spectral data to float samples, applying all supported tools as appropriate.
Definition at line 1990 of file aacdec.c.
Referenced by aac_decode_frame_int().
static void update_ltp | ( | AACContext * | ac, |
SingleChannelElement * | sce | ||
) | [static] |
Update the LTP buffer for next frame.
Definition at line 1802 of file aacdec.c.
Referenced by spectral_to_sample().
static float* VMUL2 | ( | float * | dst, |
const float * | v, | ||
unsigned | idx, | ||
const float * | scale | ||
) | [inline, static] |
Definition at line 933 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
static float* VMUL2S | ( | float * | dst, |
const float * | v, | ||
unsigned | idx, | ||
unsigned | sign, | ||
const float * | scale | ||
) | [inline, static] |
Definition at line 957 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
static float* VMUL4 | ( | float * | dst, |
const float * | v, | ||
unsigned | idx, | ||
const float * | scale | ||
) | [inline, static] |
Definition at line 944 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
static float* VMUL4S | ( | float * | dst, |
const float * | v, | ||
unsigned | idx, | ||
unsigned | sign, | ||
const float * | scale | ||
) | [inline, static] |
Definition at line 974 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
static void windowing_and_mdct_ltp | ( | AACContext * | ac, |
float * | out, | ||
float * | in, | ||
IndividualChannelStream * | ics | ||
) | [static] |
Apply windowing and MDCT to obtain the spectral coefficient from the predicted sample by LTP.
Definition at line 1744 of file aacdec.c.
Referenced by apply_ltp().
const float cce_scale[] [static] |
{ 1.09050773266525765921, 1.18920711500272106672, M_SQRT2, 2, }
Definition at line 1481 of file aacdec.c.
Referenced by decode_cce().
{ "aac", AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC, sizeof(AACContext), aac_decode_init, NULL, aac_decode_close, aac_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("Advanced Audio Coding"), .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }, .channel_layouts = aac_channel_layout, }
{ .name = "aac_latm", .type = AVMEDIA_TYPE_AUDIO, .id = CODEC_ID_AAC_LATM, .priv_data_size = sizeof(struct LATMContext), .init = latm_decode_init, .close = aac_decode_close, .decode = latm_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("AAC LATM (Advanced Audio Codec LATM syntax)"), .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }, .channel_layouts = aac_channel_layout, }
const char overread_err[] = "Input buffer exhausted before END element found\n" [static] |
Definition at line 119 of file aacdec.c.
Referenced by aac_decode_frame_int(), decode_band_types(), decode_pce(), and skip_data_stream_element().
VLC vlc_scalefactors [static] |
VLC vlc_spectral[11] [static] |