aacdec_template.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "decode.h"
#include "internal.h"
#include "lpc_functions.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	MDCT_INIT(s, fn, len, sval)
#define	AACDEC_FLAGS   AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
	AVOptions for Japanese DTV specific extensions (ADTS only) More...
#define	OFF(field)   offsetof(AACDecContext, field)

Functions
static int	output_configure (AACDecContext *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 (AACDecContext *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, uint64_t *layout)
static int	count_paired_channels (uint8_t(*layout_map)[3], int tags, int pos, int current)
static int	assign_channels (struct elem_to_channel e2c_vec[MAX_ELEM_ID], uint8_t(*layout_map)[3], uint64_t *layout, int tags, int layer, int pos, int *current)
static uint64_t	sniff_channel_order (uint8_t(*layout_map)[3], int tags)
static int	push_output_configuration (AACDecContext *ac)
	Save current output configuration if and only if it has been locked. More...
static void	pop_output_configuration (AACDecContext *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 (AACDecContext *ac, 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 ChannelElement *	get_che (AACDecContext *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 (AACDecContext *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 (AACDecContext *ac, AVCodecContext *avctx, GetBitContext *gb, MPEG4AudioConfig *m4ac, int channel_config)
static int	decode_audio_specific_config_gb (AACDecContext *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 (AACDecContext *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 (AACDecContext *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 (AACDecContext *ac, GetBitContext *gb)
	Skip data_stream_element; reference: table 4.10. More...
static int	decode_prediction (AACDecContext *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 (AACDecContext *ac, IndividualChannelStream *ics, GetBitContext *gb)
	Decode Individual Channel Stream info; reference: table 4.6. More...
static int	decode_band_types (AACDecContext *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 (AACDecContext *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 (AACDecContext *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 (AACDecContext *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 (AACDecContext *ac, SingleChannelElement *sce)
	Apply AAC-Main style frequency domain prediction. More...
static void	decode_gain_control (SingleChannelElement *sce, GetBitContext *gb)
static int	decode_ics (AACDecContext *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 (AACDecContext *ac, ChannelElement *cpe)
	Mid/Side stereo decoding; reference: 4.6.8.1.3. More...
static void	apply_intensity_stereo (AACDecContext *ac, ChannelElement *cpe, int ms_present)
	intensity stereo decoding; reference: 4.6.8.2.3 More...
static int	decode_cpe (AACDecContext *ac, GetBitContext *gb, ChannelElement *cpe)
	Decode a channel_pair_element; reference: table 4.4. More...
static int	decode_cce (AACDecContext *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 (AACDecContext *ac, GetBitContext *gb, int len)
static int	decode_extension_payload (AACDecContext *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 (AACDecContext *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 (AACDecContext *ac, SingleChannelElement *sce)
	Apply the long term prediction. More...
static void	update_ltp (AACDecContext *ac, SingleChannelElement *sce)
	Update the LTP buffer for next frame. More...
static void	imdct_and_windowing (AACDecContext *ac, SingleChannelElement *sce)
	Conduct IMDCT and windowing. More...
static void	imdct_and_windowing_960 (AACDecContext *ac, SingleChannelElement *sce)
	Conduct IMDCT and windowing. More...
static void	imdct_and_windowing_ld (AACDecContext *ac, SingleChannelElement *sce)
static void	imdct_and_windowing_eld (AACDecContext *ac, SingleChannelElement *sce)
static void	apply_channel_coupling (AACDecContext *ac, ChannelElement *cc, enum RawDataBlockType type, int elem_id, enum CouplingPoint coupling_point, void(*apply_coupling_method)(AACDecContext *ac, SingleChannelElement *target, ChannelElement *cce, int index))
	channel coupling transformation interface More...
static void	spectral_to_sample (AACDecContext *ac, int samples)
	Convert spectral data to samples, applying all supported tools as appropriate. More...
static int	parse_adts_frame_header (AACDecContext *ac, GetBitContext *gb)
static int	aac_decode_er_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, GetBitContext *gb)
static int	aac_decode_frame_int (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, GetBitContext *gb, const AVPacket *avpkt)
static int	aac_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold int	aac_decode_close (AVCodecContext *avctx)

Variables
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

overread_err

#define overread_err   "Input buffer exhausted before END element found\n"

Definition at line 103 of file aacdec_template.c.

MDCT_INIT

#define MDCT_INIT	(		s,
			fn,
			len,
			sval
	)

Value:

    scale = sval;                                                              \
    ret = av_tx_init(&s, &fn, TX_TYPE, 1, len, &scale, 0);                     \
    if (ret < 0)                                                               \
        return ret;

AACDEC_FLAGS

#define AACDEC_FLAGS   AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

AVOptions for Japanese DTV specific extensions (ADTS only)

Definition at line 3423 of file aacdec_template.c.

OFF

#define OFF

(

field

)

offsetof(AACDecContext, field)

Definition at line 3424 of file aacdec_template.c.

Function Documentation

output_configure()

static int output_configure ( AACDecContext *  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 448 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().

count_channels()

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

static

Definition at line 105 of file aacdec_template.c.

Referenced by decode_ga_specific_config().

che_configure()

static av_cold int che_configure ( AACDecContext *  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_pos	current channel position configuration
type	channel element type
id	channel element id
channels	count of the number of channels in the configuration

Returns

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

Definition at line 129 of file aacdec_template.c.

Referenced by output_configure().

frame_configure_elements()

static int frame_configure_elements ( AVCodecContext *  avctx )

static

Definition at line 163 of file aacdec_template.c.

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

assign_pair()

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, uint64_t *  layout  )

static

Definition at line 204 of file aacdec_template.c.

Referenced by assign_channels().

count_paired_channels()

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

static

Definition at line 242 of file aacdec_template.c.

Referenced by assign_channels().

assign_channels()

static int assign_channels ( struct elem_to_channel  e2c_vec[MAX_ELEM_ID], uint8_t(*)  layout_map[3], uint64_t *  layout, int  tags, int  layer, int  pos, int *  current  )

static

Definition at line 274 of file aacdec_template.c.

Referenced by sniff_channel_order().

sniff_channel_order()

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

static

Definition at line 352 of file aacdec_template.c.

Referenced by output_configure().

push_output_configuration()

static int push_output_configuration ( AACDecContext *  ac )

static

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

Definition at line 416 of file aacdec_template.c.

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

pop_output_configuration()

static void pop_output_configuration ( AACDecContext *  ac )

static

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

Definition at line 432 of file aacdec_template.c.

Referenced by aac_decode_frame_int(), and latm_decode_frame().

flush()

static void flush ( AVCodecContext *  avctx )

static

Definition at line 514 of file aacdec_template.c.

set_default_channel_config()

static int set_default_channel_config ( AACDecContext *  ac, 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 537 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().

get_che()

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

static

Definition at line 577 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), and aac_decode_frame_int().

decode_channel_map()

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

type	speaker type/position for these channels

Definition at line 723 of file aacdec_template.c.

Referenced by decode_pce().

relative_align_get_bits()

static void relative_align_get_bits ( GetBitContext *  gb, int  reference_position  )

inlinestatic

Definition at line 753 of file aacdec_template.c.

Referenced by decode_pce().

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 765 of file aacdec_template.c.

Referenced by aac_decode_frame_int(), and decode_ga_specific_config().

decode_ga_specific_config()

static int decode_ga_specific_config ( AACDecContext *  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

ac	pointer to AACDecContext, may be null
avctx	pointer to AVCCodecContext, used for logging

Returns

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

Definition at line 835 of file aacdec_template.c.

Referenced by decode_audio_specific_config_gb().

decode_eld_specific_config()

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

static

Definition at line 916 of file aacdec_template.c.

Referenced by decode_audio_specific_config_gb().

decode_audio_specific_config_gb()

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

static

Decode audio specific configuration; reference: table 1.13.

Parameters

ac	pointer to AACDecContext, may be null
avctx	pointer to AVCCodecContext, used for logging
m4ac	pointer to MPEG4AudioConfig, used for parsing
gb	buffer holding an audio specific config
get_bit_alignment	relative alignment for byte align operations
sync_extension	look for an appended sync extension

Returns

Returns error status or number of consumed bits. <0 - error

Definition at line 985 of file aacdec_template.c.

Referenced by decode_audio_specific_config(), and latm_decode_audio_specific_config().

decode_audio_specific_config()

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

static

Definition at line 1052 of file aacdec_template.c.

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

lcg_random()

static av_always_inline int lcg_random ( unsigned  previous_val )

static

linear congruential pseudorandom number generator

Parameters

previous_val

pointer to the current state of the generator

Returns

Returns a 32-bit pseudorandom integer

Definition at line 1085 of file aacdec_template.c.

Referenced by decode_spectrum_and_dequant(), and search_for_pns().

reset_all_predictors()

static void reset_all_predictors ( PredictorState *  ps )

static

Definition at line 1091 of file aacdec_template.c.

Referenced by apply_prediction().

sample_rate_idx()

static int sample_rate_idx ( int  rate )

static

Definition at line 1098 of file aacdec_template.c.

Referenced by aac_decode_init().

reset_predictor_group()

static void reset_predictor_group ( PredictorState *  ps, int  group_num  )

static

Definition at line 1114 of file aacdec_template.c.

Referenced by apply_prediction().

aacdec_init()

static void aacdec_init ( AACDecContext *  ac )

static

Definition at line 3402 of file aacdec_template.c.

Referenced by aac_decode_init().

aac_static_table_init()

static av_cold void aac_static_table_init ( void  )

static

Definition at line 1123 of file aacdec_template.c.

Referenced by aac_decode_init().

aac_decode_init()

static av_cold int aac_decode_init ( AVCodecContext *  avctx )

static

Definition at line 1149 of file aacdec_template.c.

Referenced by latm_decode_init().

skip_data_stream_element()

static int skip_data_stream_element ( AACDecContext *  ac, GetBitContext *  gb  )

static

Skip data_stream_element; reference: table 4.10.

Definition at line 1250 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

decode_prediction()

static int decode_prediction ( AACDecContext *  ac, IndividualChannelStream *  ics, GetBitContext *  gb  )

static

Definition at line 1267 of file aacdec_template.c.

Referenced by decode_ics_info().

decode_ltp()

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 1289 of file aacdec_template.c.

Referenced by decode_cpe(), and decode_ics_info().

decode_ics_info()

static int decode_ics_info ( AACDecContext *  ac, IndividualChannelStream *  ics, GetBitContext *  gb  )

static

Decode Individual Channel Stream info; reference: table 4.6.

Definition at line 1303 of file aacdec_template.c.

Referenced by decode_cpe(), and decode_ics().

decode_band_types()

static int decode_band_types ( AACDecContext *  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_type	array of the used band type
band_type_run_end	array of the last scalefactor band of a band type run

Returns

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

Definition at line 1429 of file aacdec_template.c.

Referenced by decode_ics().

decode_scalefactors()

static int decode_scalefactors ( AACDecContext *  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_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

Returns

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

Definition at line 1478 of file aacdec_template.c.

Referenced by decode_ics().

decode_pulses()

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 1553 of file aacdec_template.c.

Referenced by decode_ics().

decode_tns()

static int decode_tns ( AACDecContext *  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 1580 of file aacdec_template.c.

Referenced by decode_ics().

decode_mid_side_stereo()

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

static

Decode Mid/Side data; reference: table 4.54.

Parameters

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 1623 of file aacdec_template.c.

Referenced by decode_cpe().

decode_spectrum_and_dequant()

static int decode_spectrum_and_dequant ( AACDecContext *  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

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

Returns

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

Definition at line 1648 of file aacdec_template.c.

Referenced by decode_ics().

apply_prediction()

static void apply_prediction ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Apply AAC-Main style frequency domain prediction.

Definition at line 1943 of file aacdec_template.c.

Referenced by decode_cpe(), and decode_ics().

decode_gain_control()

static void decode_gain_control ( SingleChannelElement *  sce, GetBitContext *  gb  )

static

Definition at line 1971 of file aacdec_template.c.

Referenced by decode_ics().

decode_ics()

static int decode_ics ( AACDecContext *  ac, SingleChannelElement *  sce, GetBitContext *  gb, int  common_window, int  scale_flag  )

static

Decode an individual_channel_stream payload; reference: table 4.44.

Parameters

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.)

Returns

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

Definition at line 2006 of file aacdec_template.c.

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

apply_mid_side_stereo()

static void apply_mid_side_stereo ( AACDecContext *  ac, ChannelElement *  cpe  )

static

Mid/Side stereo decoding; reference: 4.6.8.1.3.

Definition at line 2097 of file aacdec_template.c.

Referenced by decode_cpe().

apply_intensity_stereo()

static void apply_intensity_stereo ( AACDecContext *  ac, ChannelElement *  cpe, int  ms_present  )

static

intensity stereo decoding; reference: 4.6.8.2.3

Parameters

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 2135 of file aacdec_template.c.

Referenced by decode_cpe().

decode_cpe()

static int decode_cpe ( AACDecContext *  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 2185 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), and aac_decode_frame_int().

decode_cce()

static int decode_cce ( AACDecContext *  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 2238 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

decode_drc_channel_exclusions()

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 2322 of file aacdec_template.c.

Referenced by decode_dynamic_range().

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 2341 of file aacdec_template.c.

Referenced by decode_extension_payload().

decode_fill()

static int decode_fill ( AACDecContext *  ac, GetBitContext *  gb, int  len  )

static

Definition at line 2388 of file aacdec_template.c.

Referenced by decode_extension_payload().

decode_extension_payload()

static int decode_extension_payload ( AACDecContext *  ac, GetBitContext *  gb, int  cnt, ChannelElement *  che, enum RawDataBlockType  elem_type  )

static

Decode extension data (incomplete); reference: table 4.51.

Parameters

cnt	length of TYPE_FIL syntactic element in bytes

Returns

Returns number of bytes consumed

Definition at line 2421 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

apply_tns()

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

decode	1 if tool is used normally, 0 if tool is used in LTP.
coef	spectral coefficients

Definition at line 2491 of file aacdec_template.c.

Referenced by aacdec_init().

windowing_and_mdct_ltp()

static void windowing_and_mdct_ltp ( AACDecContext *  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 2551 of file aacdec_template.c.

Referenced by aacdec_init().

apply_ltp()

static void apply_ltp ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Apply the long term prediction.

Definition at line 2577 of file aacdec_template.c.

Referenced by aacdec_init().

update_ltp()

static void update_ltp ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Update the LTP buffer for next frame.

Definition at line 2609 of file aacdec_template.c.

Referenced by aacdec_init().

imdct_and_windowing()

static void imdct_and_windowing ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Conduct IMDCT and windowing.

Definition at line 2647 of file aacdec_template.c.

Referenced by aacdec_init().

imdct_and_windowing_960()

static void imdct_and_windowing_960 ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Conduct IMDCT and windowing.

Definition at line 2711 of file aacdec_template.c.

Referenced by spectral_to_sample().

imdct_and_windowing_ld()

static void imdct_and_windowing_ld ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Definition at line 2772 of file aacdec_template.c.

Referenced by spectral_to_sample().

imdct_and_windowing_eld()

static void imdct_and_windowing_eld ( AACDecContext *  ac, SingleChannelElement *  sce  )

static

Definition at line 2797 of file aacdec_template.c.

Referenced by spectral_to_sample().

apply_channel_coupling()

static void apply_channel_coupling ( AACDecContext *  ac, ChannelElement *  cc, enum RawDataBlockType  type, int  elem_id, enum CouplingPoint  coupling_point, void(*)(AACDecContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)  apply_coupling_method  )

static

channel coupling transformation interface

Parameters

apply_coupling_method

pointer to (in)dependent coupling function

Definition at line 2865 of file aacdec_template.c.

Referenced by spectral_to_sample().

spectral_to_sample()

static void spectral_to_sample ( AACDecContext *  ac, int  samples  )

static

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

Definition at line 2898 of file aacdec_template.c.

Referenced by aac_decode_er_frame(), and aac_decode_frame_int().

parse_adts_frame_header()

static int parse_adts_frame_header ( AACDecContext *  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 2970 of file aacdec_template.c.

Referenced by aac_decode_frame_int().

aac_decode_er_frame()

static int aac_decode_er_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, GetBitContext *  gb  )

static

Definition at line 3032 of file aacdec_template.c.

Referenced by aac_decode_frame(), and latm_decode_frame().

aac_decode_frame_int()

static int aac_decode_frame_int ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, GetBitContext *  gb, const AVPacket *  avpkt  )

static

Definition at line 3104 of file aacdec_template.c.

Referenced by aac_decode_frame(), and latm_decode_frame().

aac_decode_frame()

static int aac_decode_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Definition at line 3314 of file aacdec_template.c.

aac_decode_close()

static av_cold int aac_decode_close ( AVCodecContext *  avctx )

static

Definition at line 3377 of file aacdec_template.c.

Variable Documentation

aac_table_init

AVOnce aac_table_init = AV_ONCE_INIT

static

Definition at line 1147 of file aacdec_template.c.

Referenced by aac_decode_init().

cce_scale

const float cce_scale[]

static

Initial value:

= {
    1.09050773266525765921, 
    1.18920711500272106672, 
    M_SQRT2,
    2,
}

Definition at line 2226 of file aacdec_template.c.

Referenced by decode_cce().

options

const AVOption options[]

static

Initial value:

= {
    {"dual_mono_mode", "Select the channel to decode for dual mono",
     OFF(force_dmono_mode), AV_OPT_TYPE_INT, {.i64=-1}, -1, 2,
     AACDEC_FLAGS, .unit = "dual_mono_mode"},
 
    {"auto", "autoselection",            0, AV_OPT_TYPE_CONST, {.i64=-1}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
    {"main", "Select Main/Left channel", 0, AV_OPT_TYPE_CONST, {.i64= 1}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
    {"sub" , "Select Sub/Right channel", 0, AV_OPT_TYPE_CONST, {.i64= 2}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
    {"both", "Select both channels",     0, AV_OPT_TYPE_CONST, {.i64= 0}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
 
    { "channel_order", "Order in which the channels are to be exported",
        OFF(output_channel_order), AV_OPT_TYPE_INT,
        { .i64 = CHANNEL_ORDER_DEFAULT }, 0, 1, AACDEC_FLAGS, .unit = "channel_order" },
      { "default", "normal libavcodec channel order", 0, AV_OPT_TYPE_CONST,
        { .i64 = CHANNEL_ORDER_DEFAULT }, .flags = AACDEC_FLAGS, .unit = "channel_order" },
      { "coded",    "order in which the channels are coded in the bitstream",
        0, AV_OPT_TYPE_CONST, { .i64 = CHANNEL_ORDER_CODED }, .flags = AACDEC_FLAGS, .unit = "channel_order" },
 
    {NULL},
}

Definition at line 3425 of file aacdec_template.c.

aac_decoder_class

const AVClass aac_decoder_class

static

Initial value:

= {
    .class_name = "AAC decoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 3446 of file aacdec_template.c.