FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Data Structures | Macros | Functions | Variables
aacdec_template.c File Reference

AAC decoder. More...

#include "libavutil/thread.h"

Go to the source code of this file.

Data Structures

struct  elem_to_channel
 

Macros

#define overread_err   "Input buffer exhausted before END element found\n"
 
#define AAC_INIT_VLC_STATIC(num, size)
 
#define AACDEC_FLAGS   AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
 AVOptions for Japanese DTV specific extensions (ADTS only) More...
 

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. More...
 
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. More...
 
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 int push_output_configuration (AACContext *ac)
 Save current output configuration if and only if it has been locked. More...
 
static void pop_output_configuration (AACContext *ac)
 Restore the previous output configuration if and only if the current configuration is unlocked. More...
 
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. More...
 
static ChannelElementget_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. More...
 
static void relative_align_get_bits (GetBitContext *gb, int reference_position)
 
static int decode_pce (AVCodecContext *avctx, MPEG4AudioConfig *m4ac, uint8_t(*layout_map)[3], GetBitContext *gb, int byte_align_ref)
 Decode program configuration element; reference: table 4.2. More...
 
static int decode_ga_specific_config (AACContext *ac, AVCodecContext *avctx, GetBitContext *gb, int get_bit_alignment, MPEG4AudioConfig *m4ac, int channel_config)
 Decode GA "General Audio" specific configuration; reference: table 4.1. More...
 
static int decode_eld_specific_config (AACContext *ac, AVCodecContext *avctx, GetBitContext *gb, MPEG4AudioConfig *m4ac, int channel_config)
 
static int decode_audio_specific_config_gb (AACContext *ac, AVCodecContext *avctx, MPEG4AudioConfig *m4ac, GetBitContext *gb, int get_bit_alignment, int sync_extension)
 Decode audio specific configuration; reference: table 1.13. More...
 
static int decode_audio_specific_config (AACContext *ac, AVCodecContext *avctx, MPEG4AudioConfig *m4ac, const uint8_t *data, int64_t bit_size, int sync_extension)
 
static av_always_inline int lcg_random (unsigned previous_val)
 linear congruential pseudorandom number generator More...
 
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 void aac_static_table_init (void)
 
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. More...
 
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. More...
 
static int decode_ics_info (AACContext *ac, IndividualChannelStream *ics, GetBitContext *gb)
 Decode Individual Channel Stream info; reference: table 4.6. More...
 
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. More...
 
static int decode_scalefactors (AACContext *ac, INTFLOAT 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. More...
 
static int decode_pulses (Pulse *pulse, GetBitContext *gb, const uint16_t *swb_offset, int num_swb)
 Decode pulse data; reference: table 4.7. More...
 
static int decode_tns (AACContext *ac, TemporalNoiseShaping *tns, GetBitContext *gb, const IndividualChannelStream *ics)
 Decode Temporal Noise Shaping data; reference: table 4.48. More...
 
static void decode_mid_side_stereo (ChannelElement *cpe, GetBitContext *gb, int ms_present)
 Decode Mid/Side data; reference: table 4.54. More...
 
static int decode_spectrum_and_dequant (AACContext *ac, INTFLOAT coef[1024], GetBitContext *gb, const INTFLOAT sf[120], int pulse_present, const Pulse *pulse, const IndividualChannelStream *ics, enum BandType band_type[120])
 Decode spectral data; reference: table 4.50. More...
 
static void apply_prediction (AACContext *ac, SingleChannelElement *sce)
 Apply AAC-Main style frequency domain prediction. More...
 
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. More...
 
static void apply_mid_side_stereo (AACContext *ac, ChannelElement *cpe)
 Mid/Side stereo decoding; reference: 4.6.8.1.3. More...
 
static void apply_intensity_stereo (AACContext *ac, ChannelElement *cpe, int ms_present)
 intensity stereo decoding; reference: 4.6.8.2.3 More...
 
static int decode_cpe (AACContext *ac, GetBitContext *gb, ChannelElement *cpe)
 Decode a channel_pair_element; reference: table 4.4. More...
 
static int decode_cce (AACContext *ac, GetBitContext *gb, ChannelElement *che)
 Decode coupling_channel_element; reference: table 4.8. More...
 
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. More...
 
static int decode_dynamic_range (DynamicRangeControl *che_drc, GetBitContext *gb)
 Decode dynamic range information; reference: table 4.52. More...
 
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. More...
 
static void apply_tns (INTFLOAT coef_param[1024], TemporalNoiseShaping *tns, IndividualChannelStream *ics, int decode)
 Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3. More...
 
static void windowing_and_mdct_ltp (AACContext *ac, INTFLOAT *out, INTFLOAT *in, IndividualChannelStream *ics)
 Apply windowing and MDCT to obtain the spectral coefficient from the predicted sample by LTP. More...
 
static void apply_ltp (AACContext *ac, SingleChannelElement *sce)
 Apply the long term prediction. More...
 
static void update_ltp (AACContext *ac, SingleChannelElement *sce)
 Update the LTP buffer for next frame. More...
 
static void imdct_and_windowing (AACContext *ac, SingleChannelElement *sce)
 Conduct IMDCT and windowing. More...
 
static void imdct_and_windowing_960 (AACContext *ac, SingleChannelElement *sce)
 Conduct IMDCT and windowing. More...
 
static void imdct_and_windowing_ld (AACContext *ac, SingleChannelElement *sce)
 
static void imdct_and_windowing_eld (AACContext *ac, SingleChannelElement *sce)
 
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 More...
 
static void spectral_to_sample (AACContext *ac, int samples)
 Convert spectral data to samples, applying all supported tools as appropriate. More...
 
static int parse_adts_frame_header (AACContext *ac, GetBitContext *gb)
 
static int aac_decode_er_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, 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)
 

Variables

static VLC vlc_scalefactors
 
static VLC vlc_spectral [11]
 
static AVOnce aac_table_init = AV_ONCE_INIT
 
static const float cce_scale []
 
static const AVOption options []
 
static const AVClass aac_decoder_class
 

Detailed Description

AAC decoder.

Author
Oded Shimon ( ods15 ods15 dyndns org )
Maxim Gavrilov ( maxim.gavrilov gmail com )

AAC decoder fixed-point implementation

Author
Stanislav Ocovaj ( stanislav.ocovaj imgtec com )
Nedeljko Babic ( nedeljko.babic imgtec com )

Definition in file aacdec_template.c.

Macro Definition Documentation

#define overread_err   "Input buffer exhausted before END element found\n"
#define AAC_INIT_VLC_STATIC (   num,
  size 
)
Value:
ff_aac_spectral_bits[num], sizeof(ff_aac_spectral_bits[num][0]), \
sizeof(ff_aac_spectral_bits[num][0]), \
sizeof(ff_aac_spectral_codes[num][0]), \
size);
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
ptrdiff_t size
Definition: opengl_enc.c:101
const uint16_t ff_aac_spectral_sizes[11]
Definition: aactab.c:427
const uint8_t *const ff_aac_spectral_bits[11]
Definition: aactab.c:422
static VLC vlc_spectral[11]
const uint16_t *const ff_aac_spectral_codes[11]
Definition: aactab.c:417

Definition at line 1098 of file aacdec_template.c.

Referenced by aac_static_table_init().

AVOptions for Japanese DTV specific extensions (ADTS only)

Definition at line 3393 of file aacdec_template.c.

Function Documentation

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 
)
static

Configure output channel order based on the current program configuration element.

Returns
Returns error status. 0 - OK, !0 - error

Definition at line 440 of file aacdec_template.c.

Referenced by aac_decode_frame_int(), aac_decode_init(), decode_eld_specific_config(), decode_extension_payload(), decode_ga_specific_config(), get_che(), parse_adts_frame_header(), and pop_output_configuration().

static int count_channels ( uint8_t(*)  layout[3],
int  tags 
)
static

Definition at line 103 of file aacdec_template.c.

Referenced by decode_ga_specific_config().

static av_cold int che_configure ( AACContext ac,
enum ChannelPosition  che_pos,
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 FFmpeg channel layout.

Parameters
che_poscurrent channel position configuration
typechannel element type
idchannel element id
channelscount of the number of channels in the configuration
Returns
Returns error status. 0 - OK, !0 - error

Definition at line 127 of file aacdec_template.c.

Referenced by output_configure().

static int frame_configure_elements ( AVCodecContext avctx)
static

Definition at line 158 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), aac_decode_frame_int(), and output_configure().

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

Definition at line 199 of file aacdec_template.c.

Referenced by sniff_channel_order().

static int count_paired_channels ( uint8_t(*)  layout_map[3],
int  tags,
int  pos,
int current 
)
static

Definition at line 228 of file aacdec_template.c.

Referenced by sniff_channel_order().

static uint64_t sniff_channel_order ( uint8_t(*)  layout_map[3],
int  tags 
)
static

Definition at line 260 of file aacdec_template.c.

Referenced by output_configure().

static int push_output_configuration ( AACContext ac)
static

Save current output configuration if and only if it has been locked.

Definition at line 409 of file aacdec_template.c.

Referenced by aac_decode_frame(), aac_decode_frame_int(), get_che(), latm_decode_frame(), and parse_adts_frame_header().

static void pop_output_configuration ( AACContext ac)
static

Restore the previous output configuration if and only if the current configuration is unlocked.

Definition at line 424 of file aacdec_template.c.

Referenced by aac_decode_frame(), aac_decode_frame_int(), and latm_decode_frame().

static void flush ( AVCodecContext avctx)
static
static int set_default_channel_config ( AVCodecContext avctx,
uint8_t(*)  layout_map[3],
int tags,
int  channel_config 
)
static

Set up channel positions based on a default channel configuration as specified in table 1.17.

Returns
Returns error status. 0 - OK, !0 - error

Definition at line 523 of file aacdec_template.c.

Referenced by aac_decode_init(), decode_eld_specific_config(), decode_ga_specific_config(), get_che(), and parse_adts_frame_header().

static ChannelElement* get_che ( AACContext ac,
int  type,
int  elem_id 
)
static

Definition at line 560 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), and aac_decode_frame_int().

static void decode_channel_map ( uint8_t  layout_map[][3],
enum ChannelPosition  type,
GetBitContext gb,
int  n 
)
static

Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.

Parameters
typespeaker type/position for these channels

Definition at line 692 of file aacdec_template.c.

Referenced by decode_pce().

static void relative_align_get_bits ( GetBitContext gb,
int  reference_position 
)
inlinestatic

Definition at line 722 of file aacdec_template.c.

Referenced by decode_pce().

static int decode_pce ( AVCodecContext avctx,
MPEG4AudioConfig m4ac,
uint8_t(*)  layout_map[3],
GetBitContext gb,
int  byte_align_ref 
)
static

Decode program configuration element; reference: table 4.2.

Returns
Returns error status. 0 - OK, !0 - error

Definition at line 734 of file aacdec_template.c.

Referenced by aac_decode_frame_int(), and decode_ga_specific_config().

static int decode_ga_specific_config ( AACContext ac,
AVCodecContext avctx,
GetBitContext gb,
int  get_bit_alignment,
MPEG4AudioConfig m4ac,
int  channel_config 
)
static

Decode GA "General Audio" specific configuration; reference: table 4.1.

Parameters
acpointer to AACContext, may be null
avctxpointer to AVCCodecContext, used for logging
Returns
Returns error status. 0 - OK, !0 - error

Definition at line 804 of file aacdec_template.c.

Referenced by decode_audio_specific_config_gb().

static int decode_eld_specific_config ( AACContext ac,
AVCodecContext avctx,
GetBitContext gb,
MPEG4AudioConfig m4ac,
int  channel_config 
)
static

Definition at line 893 of file aacdec_template.c.

Referenced by decode_audio_specific_config_gb().

static int decode_audio_specific_config_gb ( AACContext ac,
AVCodecContext avctx,
MPEG4AudioConfig m4ac,
GetBitContext gb,
int  get_bit_alignment,
int  sync_extension 
)
static

Decode audio specific configuration; reference: table 1.13.

Parameters
acpointer to AACContext, may be null
avctxpointer to AVCCodecContext, used for logging
m4acpointer to MPEG4AudioConfig, used for parsing
gbbuffer holding an audio specific config
get_bit_alignmentrelative alignment for byte align operations
sync_extensionlook for an appended sync extension
Returns
Returns error status or number of consumed bits. <0 - error

Definition at line 968 of file aacdec_template.c.

Referenced by decode_audio_specific_config(), and latm_decode_audio_specific_config().

static int decode_audio_specific_config ( AACContext ac,
AVCodecContext avctx,
MPEG4AudioConfig m4ac,
const uint8_t data,
int64_t  bit_size,
int  sync_extension 
)
static

Definition at line 1029 of file aacdec_template.c.

Referenced by aac_decode_frame(), aac_decode_init(), and latm_decode_frame().

static av_always_inline int lcg_random ( unsigned  previous_val)
static

linear congruential pseudorandom number generator

Parameters
previous_valpointer to the current state of the generator
Returns
Returns a 32-bit pseudorandom integer

Definition at line 1062 of file aacdec_template.c.

Referenced by decode_spectrum_and_dequant(), and search_for_pns().

static void reset_all_predictors ( PredictorState ps)
static

Definition at line 1068 of file aacdec_template.c.

Referenced by apply_prediction().

static int sample_rate_idx ( int  rate)
static

Definition at line 1075 of file aacdec_template.c.

Referenced by aac_decode_init().

static void reset_predictor_group ( PredictorState ps,
int  group_num 
)
static

Definition at line 1091 of file aacdec_template.c.

Referenced by apply_prediction().

static void aacdec_init ( AACContext ac)
static

Definition at line 3373 of file aacdec_template.c.

Referenced by aac_decode_init().

static av_cold void aac_static_table_init ( void  )
static

Definition at line 1108 of file aacdec_template.c.

Referenced by aac_decode_init().

static av_cold int aac_decode_init ( AVCodecContext avctx)
static

Definition at line 1154 of file aacdec_template.c.

Referenced by latm_decode_init().

static int skip_data_stream_element ( AACContext ac,
GetBitContext gb 
)
static

Skip data_stream_element; reference: table 4.10.

Definition at line 1247 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

static int decode_prediction ( AACContext ac,
IndividualChannelStream ics,
GetBitContext gb 
)
static

Definition at line 1264 of file aacdec_template.c.

Referenced by decode_ics_info().

static void decode_ltp ( LongTermPrediction ltp,
GetBitContext gb,
uint8_t  max_sfb 
)
static

Decode Long Term Prediction data; reference: table 4.xx.

Definition at line 1286 of file aacdec_template.c.

Referenced by decode_cpe(), and decode_ics_info().

static int decode_ics_info ( AACContext ac,
IndividualChannelStream ics,
GetBitContext gb 
)
static

Decode Individual Channel Stream info; reference: table 4.6.

Definition at line 1300 of file aacdec_template.c.

Referenced by decode_cpe(), and decode_ics().

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.

Parameters
band_typearray of the used band type
band_type_run_endarray of the last scalefactor band of a band type run
Returns
Returns error status. 0 - OK, !0 - error

Definition at line 1426 of file aacdec_template.c.

Referenced by decode_ics().

static int decode_scalefactors ( AACContext ac,
INTFLOAT  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.

Parameters
global_gainfirst scalefactor value as scalefactors are differentially coded
band_typearray of the used band type
band_type_run_endarray of the last scalefactor band of a band type run
sfarray of scalefactors or intensity stereo positions
Returns
Returns error status. 0 - OK, !0 - error

Definition at line 1475 of file aacdec_template.c.

Referenced by decode_ics().

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 1550 of file aacdec_template.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.

Returns
Returns error status. 0 - OK, !0 - error

Definition at line 1577 of file aacdec_template.c.

Referenced by decode_ics().

static void decode_mid_side_stereo ( ChannelElement cpe,
GetBitContext gb,
int  ms_present 
)
static

Decode Mid/Side data; reference: table 4.54.

Parameters
ms_presentIndicates 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 1620 of file aacdec_template.c.

Referenced by decode_cpe().

static int decode_spectrum_and_dequant ( AACContext ac,
INTFLOAT  coef[1024],
GetBitContext gb,
const INTFLOAT  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.

Parameters
coefarray of dequantized, scaled spectral data
sfarray of scalefactors or intensity stereo positions
pulse_presentset if pulses are present
pulsepointer to pulse data struct
band_typearray of the used band type
Returns
Returns error status. 0 - OK, !0 - error

Definition at line 1645 of file aacdec_template.c.

Referenced by decode_ics().

static void apply_prediction ( AACContext ac,
SingleChannelElement sce 
)
static

Apply AAC-Main style frequency domain prediction.

Definition at line 1942 of file aacdec_template.c.

Referenced by decode_cpe(), and decode_ics().

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.

Parameters
common_windowChannels have independent [0], or shared [1], Individual Channel Stream information.
scale_flagscalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.)
Returns
Returns error status. 0 - OK, !0 - error

Definition at line 1978 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), aac_decode_frame_int(), decode_cce(), and decode_cpe().

static void apply_mid_side_stereo ( AACContext ac,
ChannelElement cpe 
)
static

Mid/Side stereo decoding; reference: 4.6.8.1.3.

Definition at line 2067 of file aacdec_template.c.

Referenced by decode_cpe().

static void apply_intensity_stereo ( AACContext ac,
ChannelElement cpe,
int  ms_present 
)
static

intensity stereo decoding; reference: 4.6.8.2.3

Parameters
ms_presentIndicates 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 2105 of file aacdec_template.c.

Referenced by decode_cpe().

static int decode_cpe ( AACContext ac,
GetBitContext gb,
ChannelElement cpe 
)
static

Decode a channel_pair_element; reference: table 4.4.

Returns
Returns error status. 0 - OK, !0 - error

Definition at line 2155 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), and aac_decode_frame_int().

static int decode_cce ( AACContext ac,
GetBitContext gb,
ChannelElement che 
)
static

Decode coupling_channel_element; reference: table 4.8.

Returns
Returns error status. 0 - OK, !0 - error

Definition at line 2208 of file aacdec_template.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.

Returns
Returns number of bytes consumed.

Definition at line 2292 of file aacdec_template.c.

Referenced by decode_dynamic_range().

static int decode_dynamic_range ( DynamicRangeControl che_drc,
GetBitContext gb 
)
static

Decode dynamic range information; reference: table 4.52.

Returns
Returns number of bytes consumed.

Definition at line 2311 of file aacdec_template.c.

Referenced by decode_extension_payload().

static int decode_fill ( AACContext ac,
GetBitContext gb,
int  len 
)
static

Definition at line 2358 of file aacdec_template.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.

Parameters
cntlength of TYPE_FIL syntactic element in bytes
Returns
Returns number of bytes consumed

Definition at line 2391 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

static void apply_tns ( INTFLOAT  coef_param[1024],
TemporalNoiseShaping tns,
IndividualChannelStream ics,
int  decode 
)
static

Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.

Parameters
decode1 if tool is used normally, 0 if tool is used in LTP.
coefspectral coefficients

Definition at line 2456 of file aacdec_template.c.

Referenced by aacdec_init().

static void windowing_and_mdct_ltp ( AACContext ac,
INTFLOAT out,
INTFLOAT in,
IndividualChannelStream ics 
)
static

Apply windowing and MDCT to obtain the spectral coefficient from the predicted sample by LTP.

Definition at line 2513 of file aacdec_template.c.

Referenced by aacdec_init().

static void apply_ltp ( AACContext ac,
SingleChannelElement sce 
)
static

Apply the long term prediction.

Definition at line 2539 of file aacdec_template.c.

Referenced by aacdec_init().

static void update_ltp ( AACContext ac,
SingleChannelElement sce 
)
static

Update the LTP buffer for next frame.

Definition at line 2571 of file aacdec_template.c.

Referenced by aacdec_init().

static void imdct_and_windowing ( AACContext ac,
SingleChannelElement sce 
)
static

Conduct IMDCT and windowing.

Definition at line 2609 of file aacdec_template.c.

Referenced by aacdec_init().

static void imdct_and_windowing_960 ( AACContext ac,
SingleChannelElement sce 
)
static

Conduct IMDCT and windowing.

Definition at line 2677 of file aacdec_template.c.

Referenced by spectral_to_sample().

static void imdct_and_windowing_ld ( AACContext ac,
SingleChannelElement sce 
)
static

Definition at line 2740 of file aacdec_template.c.

Referenced by spectral_to_sample().

static void imdct_and_windowing_eld ( AACContext ac,
SingleChannelElement sce 
)
static

Definition at line 2773 of file aacdec_template.c.

Referenced by spectral_to_sample().

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

Parameters
apply_coupling_methodpointer to (in)dependent coupling function

Definition at line 2846 of file aacdec_template.c.

Referenced by spectral_to_sample().

static void spectral_to_sample ( AACContext ac,
int  samples 
)
static

Convert spectral data to samples, applying all supported tools as appropriate.

Definition at line 2879 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), and aac_decode_frame_int().

static int parse_adts_frame_header ( AACContext ac,
GetBitContext gb 
)
static

dual mono frames in Japanese DTV can have chan_config 0 WITHOUT specifying PCE. thus, set dual mono as default.

Definition at line 2951 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

static int aac_decode_er_frame ( AVCodecContext avctx,
void data,
int got_frame_ptr,
GetBitContext gb 
)
static

Definition at line 3013 of file aacdec_template.c.

Referenced by aac_decode_frame(), and latm_decode_frame().

static int aac_decode_frame_int ( AVCodecContext avctx,
void data,
int got_frame_ptr,
GetBitContext gb,
AVPacket avpkt 
)
static

Definition at line 3085 of file aacdec_template.c.

Referenced by aac_decode_frame(), and latm_decode_frame().

static int aac_decode_frame ( AVCodecContext avctx,
void data,
int got_frame_ptr,
AVPacket avpkt 
)
static

Definition at line 3278 of file aacdec_template.c.

static av_cold int aac_decode_close ( AVCodecContext avctx)
static

Definition at line 3347 of file aacdec_template.c.

Variable Documentation

VLC vlc_scalefactors
static

Definition at line 94 of file aacdec_template.c.

VLC vlc_spectral[11]
static

Definition at line 95 of file aacdec_template.c.

AVOnce aac_table_init = AV_ONCE_INIT
static

Definition at line 1152 of file aacdec_template.c.

const float cce_scale[]
static
Initial value:
= {
1.09050773266525765921,
1.18920711500272106672,
2,
}
#define M_SQRT2
Definition: mathematics.h:61

Definition at line 2196 of file aacdec_template.c.

const AVOption options[]
static
Initial value:
= {
{"dual_mono_mode", "Select the channel to decode for dual mono",
0x42, AV_OPT_TYPE_INT, {.i64=-1}, -1, 2,
AACDEC_FLAGS, "dual_mono_mode"},
{"auto", "autoselection", 0, AV_OPT_TYPE_CONST, {.i64=-1}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
{"main", "Select Main/Left channel", 0, AV_OPT_TYPE_CONST, {.i64= 1}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
{"sub" , "Select Sub/Right channel", 0, AV_OPT_TYPE_CONST, {.i64= 2}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
{"both", "Select both channels", 0, AV_OPT_TYPE_CONST, {.i64= 0}, INT_MIN, INT_MAX, AACDEC_FLAGS, "dual_mono_mode"},
{NULL},
}
#define NULL
Definition: coverity.c:32
#define AACDEC_FLAGS
AVOptions for Japanese DTV specific extensions (ADTS only)

Definition at line 3394 of file aacdec_template.c.

const AVClass aac_decoder_class
static
Initial value:
= {
.class_name = "AAC decoder",
.item_name = av_default_item_name,
.option = options,
}
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:193
static const AVOption options[]

Definition at line 3407 of file aacdec_template.c.