FFmpeg
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AAC decoder. More...
#include "libavutil/float_dsp.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.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 "libavutil/intfloat.h"
#include <assert.h>
#include <errno.h>
#include <math.h>
#include <string.h>
Go to the source code of this file.
Data Structures | |
struct | elem_to_channel |
struct | LATMContext |
Macros | |
#define | overread_err "Input buffer exhausted before END element found\n" |
#define | AAC_INIT_VLC_STATIC(num, size) |
#define | LOAS_SYNC_WORD 0x2b7 |
11 bits LOAS sync word | |
#define | AACDEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM |
AVOptions for Japanese DTV specific extensions (ADTS only) | |
Functions | |
static int | output_configure (AACContext *ac, uint8_t layout_map[MAX_ELEM_ID *4][3], int tags, enum OCStatus oc_type, int get_new_frame) |
Configure output channel order based on the current program configuration element. | |
static int | count_channels (uint8_t(*layout)[3], int tags) |
static av_cold int | che_configure (AACContext *ac, enum ChannelPosition che_pos, int type, int id, int *channels) |
Check for the channel element in the current channel position configuration. | |
static int | frame_configure_elements (AVCodecContext *avctx) |
static int | assign_pair (struct elem_to_channel e2c_vec[MAX_ELEM_ID], uint8_t(*layout_map)[3], int offset, uint64_t left, uint64_t right, int pos) |
static int | count_paired_channels (uint8_t(*layout_map)[3], int tags, int pos, int *current) |
static uint64_t | sniff_channel_order (uint8_t(*layout_map)[3], int tags) |
static void | push_output_configuration (AACContext *ac) |
Save current output configuration if and only if it has been locked. | |
static void | pop_output_configuration (AACContext *ac) |
Restore the previous output configuration if and only if the current configuration is unlocked. | |
static void | flush (AVCodecContext *avctx) |
static int | set_default_channel_config (AVCodecContext *avctx, uint8_t(*layout_map)[3], int *tags, int channel_config) |
Set up channel positions based on a default channel configuration as specified in table 1.17. | |
static ChannelElement * | get_che (AACContext *ac, int type, int elem_id) |
static void | decode_channel_map (uint8_t layout_map[][3], 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, uint8_t(*layout_map)[3], GetBitContext *gb) |
Decode program configuration element; reference: table 4.2. | |
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 bit_size, int sync_extension) |
Decode audio specific configuration; reference: table 1.13. | |
static av_always_inline int | lcg_random (unsigned 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 int | sample_rate_idx (int rate) |
static void | reset_predictor_group (PredictorState *ps, int group_num) |
static void | aacdec_init (AACContext *ac) |
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 (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) |
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) |
Decode dynamic range information; reference: table 4.52. | |
static int | decode_fill (AACContext *ac, GetBitContext *gb, int len) |
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 *got_frame_ptr, GetBitContext *gb, AVPacket *avpkt) |
static int | aac_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, 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, int asclen) |
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 *got_frame_ptr, AVPacket *avpkt) |
static av_cold int | latm_decode_init (AVCodecContext *avctx) |
Variables | |
static VLC | vlc_scalefactors |
static VLC | vlc_spectral [11] |
static const float | cce_scale [] |
static const AVOption | options [] |
static const AVClass | aac_decoder_class |
AVCodec | ff_aac_decoder |
AVCodec | ff_aac_latm_decoder |
AAC decoder.
Definition in file aacdec.c.
Definition at line 121 of file aacdec.c.
Referenced by aac_decode_frame_int(), decode_band_types(), decode_pce(), and skip_data_stream_element().
#define AAC_INIT_VLC_STATIC | ( | num, | |
size | |||
) |
Definition at line 924 of file aacdec.c.
Referenced by aac_decode_init().
#define LOAS_SYNC_WORD 0x2b7 |
#define AACDEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM |
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Configure output channel order based on the current program configuration element.
Definition at line 448 of file aacdec.c.
Referenced by aac_decode_frame_int(), aac_decode_init(), decode_extension_payload(), decode_ga_specific_config(), get_che(), parse_adts_frame_header(), and pop_output_configuration().
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Definition at line 123 of file aacdec.c.
Referenced by decode_ga_specific_config().
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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 FFmpeg 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 147 of file aacdec.c.
Referenced by output_configure().
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Definition at line 178 of file aacdec.c.
Referenced by aac_decode_frame_int(), and output_configure().
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Definition at line 216 of file aacdec.c.
Referenced by sniff_channel_order().
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Definition at line 245 of file aacdec.c.
Referenced by sniff_channel_order().
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Definition at line 277 of file aacdec.c.
Referenced by output_configure().
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Save current output configuration if and only if it has been locked.
Definition at line 421 of file aacdec.c.
Referenced by aac_decode_frame(), aac_decode_frame_int(), get_che(), latm_decode_frame(), and parse_adts_frame_header().
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Restore the previous output configuration if and only if the current configuration is unlocked.
Definition at line 432 of file aacdec.c.
Referenced by aac_decode_frame(), aac_decode_frame_int(), and latm_decode_frame().
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Definition at line 497 of file aacdec.c.
Referenced by av_interleaved_write_frame(), bmp_parse(), ogg_buffer_data(), and png_parse().
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Set up channel positions based on a default channel configuration as specified in table 1.17.
Definition at line 520 of file aacdec.c.
Referenced by aac_decode_init(), decode_ga_specific_config(), get_che(), and parse_adts_frame_header().
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Definition at line 537 of file aacdec.c.
Referenced by aac_decode_frame_int().
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Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
type | speaker type/position for these channels |
Definition at line 639 of file aacdec.c.
Referenced by decode_pce().
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Decode program configuration element; reference: table 4.2.
Definition at line 673 of file aacdec.c.
Referenced by aac_decode_frame_int(), and decode_ga_specific_config().
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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 743 of file aacdec.c.
Referenced by decode_audio_specific_config().
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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 buffer holding an audio specific config |
bit_size | size of audio specific config or data in bits |
sync_extension | look for an appended sync extension |
Definition at line 817 of file aacdec.c.
Referenced by aac_decode_frame(), aac_decode_init(), latm_decode_audio_specific_config(), and latm_decode_frame().
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linear congruential pseudorandom number generator
previous_val | pointer to the current state of the generator |
Definition at line 878 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
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Definition at line 884 of file aacdec.c.
Referenced by reset_all_predictors(), and reset_predictor_group().
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Definition at line 894 of file aacdec.c.
Referenced by apply_prediction().
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Definition at line 901 of file aacdec.c.
Referenced by aac_decode_init().
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Definition at line 917 of file aacdec.c.
Referenced by apply_prediction().
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Definition at line 3072 of file aacdec.c.
Referenced by aac_decode_init().
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Definition at line 934 of file aacdec.c.
Referenced by latm_decode_init().
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Skip data_stream_element; reference: table 4.10.
Definition at line 1035 of file aacdec.c.
Referenced by aac_decode_frame_int().
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Definition at line 1052 of file aacdec.c.
Referenced by decode_ics_info().
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Decode Long Term Prediction data; reference: table 4.xx.
Definition at line 1074 of file aacdec.c.
Referenced by decode_cpe(), and decode_ics_info().
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Decode Individual Channel Stream info; reference: table 4.6.
Definition at line 1088 of file aacdec.c.
Referenced by decode_cpe(), and decode_ics().
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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 1163 of file aacdec.c.
Referenced by decode_ics().
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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 1212 of file aacdec.c.
Referenced by decode_ics().
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Decode pulse data; reference: table 4.7.
Definition at line 1275 of file aacdec.c.
Referenced by decode_ics().
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Decode Temporal Noise Shaping data; reference: table 4.48.
Definition at line 1302 of file aacdec.c.
Referenced by decode_ics().
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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 1345 of file aacdec.c.
Referenced by decode_cpe().
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Definition at line 1360 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
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Definition at line 1371 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
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Definition at line 1384 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
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Definition at line 1401 of file aacdec.c.
Referenced by decode_spectrum_and_dequant().
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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 1439 of file aacdec.c.
Referenced by decode_ics().
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Definition at line 1678 of file aacdec.c.
Referenced by apply_prediction(), decode_line(), and encode_line().
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Apply AAC-Main style frequency domain prediction.
Definition at line 1712 of file aacdec.c.
Referenced by decode_cpe(), and decode_ics().
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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 1748 of file aacdec.c.
Referenced by aac_decode_frame_int(), decode_cce(), and decode_cpe().
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Mid/Side stereo decoding; reference: 4.6.8.1.3.
Definition at line 1812 of file aacdec.c.
Referenced by decode_cpe().
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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 1843 of file aacdec.c.
Referenced by decode_cpe().
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Decode a channel_pair_element; reference: table 4.4.
Definition at line 1885 of file aacdec.c.
Referenced by aac_decode_frame_int().
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Decode coupling_channel_element; reference: table 4.8.
Definition at line 1937 of file aacdec.c.
Referenced by aac_decode_frame_int().
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Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
Definition at line 2009 of file aacdec.c.
Referenced by decode_dynamic_range().
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Decode dynamic range information; reference: table 4.52.
Definition at line 2028 of file aacdec.c.
Referenced by decode_extension_payload().
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Definition at line 2075 of file aacdec.c.
Referenced by decode_extension_payload().
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Decode extension data (incomplete); reference: table 4.51.
cnt | length of TYPE_FIL syntactic element in bytes |
Definition at line 2108 of file aacdec.c.
Referenced by aac_decode_frame_int().
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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 2159 of file aacdec.c.
Referenced by aacdec_init().
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Apply windowing and MDCT to obtain the spectral coefficient from the predicted sample by LTP.
Definition at line 2215 of file aacdec.c.
Referenced by aacdec_init().
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Apply the long term prediction.
Definition at line 2241 of file aacdec.c.
Referenced by aacdec_init().
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Update the LTP buffer for next frame.
Definition at line 2273 of file aacdec.c.
Referenced by aacdec_init().
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Apply dependent channel coupling (applied before IMDCT).
index | index into coupling gain array |
Definition at line 2373 of file aacdec.c.
Referenced by spectral_to_sample().
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Apply independent channel coupling (applied after IMDCT).
index | index into coupling gain array |
Definition at line 2409 of file aacdec.c.
Referenced by spectral_to_sample().
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channel coupling transformation interface
apply_coupling_method | pointer to (in)dependent coupling function |
Definition at line 2428 of file aacdec.c.
Referenced by spectral_to_sample().
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Convert spectral data to float samples, applying all supported tools as appropriate.
Definition at line 2461 of file aacdec.c.
Referenced by aac_decode_frame_int().
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dual mono frames in Japanese DTV can have chan_config 0 WITHOUT specifying PCE. thus, set dual mono as default.
Definition at line 2504 of file aacdec.c.
Referenced by aac_decode_frame_int().
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Definition at line 2562 of file aacdec.c.
Referenced by aac_decode_frame(), and latm_decode_frame().
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Definition at line 2814 of file aacdec.c.
Referenced by read_stream_mux_config().
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Definition at line 2821 of file aacdec.c.
Referenced by read_stream_mux_config().
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Definition at line 2880 of file aacdec.c.
Referenced by read_audio_mux_element().
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Definition at line 2960 of file aacdec.c.
Referenced by read_audio_mux_element().
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Definition at line 2981 of file aacdec.c.
Referenced by latm_decode_frame().
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AVCodec ff_aac_decoder |
AVCodec ff_aac_latm_decoder |