aacdec_usac.c File Reference

#include "aacdec_usac.h"
#include "aacdec_tab.h"
#include "aacdec_lpd.h"
#include "aacdec_ac.h"
#include "libavcodec/aacsbr.h"
#include "libavcodec/aactab.h"
#include "libavcodec/mpeg4audio.h"
#include "libavcodec/unary.h"
#include "libavutil/mem.h"
#include "libavutil/refstruct.h"
#include "aacdec_usac_mps212.h"

Go to the source code of this file.

Macros
#define	SFB_PER_PRED_BAND   2

Functions
static uint32_t	get_escaped_value (GetBitContext *gb, int nb1, int nb2, int nb3)
static int	decode_loudness_info (AACDecContext *ac, AACUSACLoudnessInfo *info, GetBitContext *gb)
static int	decode_loudness_set (AACDecContext *ac, AACUSACConfig *usac, GetBitContext *gb)
static int	decode_usac_sbr_data (AACDecContext *ac, AACUsacElemConfig *e, GetBitContext *gb)
static void	decode_usac_element_core (AACUsacElemConfig *e, GetBitContext *gb, int sbr_ratio)
static int	decode_usac_element_pair (AACDecContext *ac, AACUsacElemConfig *e, GetBitContext *gb)
static int	decode_usac_extension (AACDecContext *ac, AACUsacElemConfig *e, GetBitContext *gb)
int	ff_aac_usac_reset_state (AACDecContext *ac, OutputConfiguration *oc)
int	ff_aac_usac_config_decode (AACDecContext *ac, AVCodecContext *avctx, GetBitContext *gb, OutputConfiguration *oc, int channel_config)
static int	decode_usac_scale_factors (AACDecContext *ac, SingleChannelElement *sce, GetBitContext *gb, uint8_t global_gain)
static int	decode_spectrum_ac (AACDecContext *s, float coef[1024], GetBitContext *gb, AACArithState *state, int reset, uint16_t len, uint16_t N)
	Decode and dequantize arithmetically coded, uniformly quantized value. More...
static int	decode_usac_stereo_cplx (AACDecContext *ac, AACUsacStereo *us, ChannelElement *cpe, GetBitContext *gb, int num_window_groups, int prev_num_window_groups, int indep_flag)
static int	setup_sce (AACDecContext *ac, SingleChannelElement *sce, AACUSACConfig *usac)
static int	decode_usac_stereo_info (AACDecContext *ac, AACUSACConfig *usac, AACUsacElemConfig *ec, ChannelElement *cpe, GetBitContext *gb, int indep_flag)
static float	noise_random_sign (unsigned int *seed)
static void	apply_noise_fill (AACDecContext *ac, SingleChannelElement *sce, AACUsacElemData *ue)
static void	spectrum_scale (AACDecContext *ac, SingleChannelElement *sce, AACUsacElemData *ue)
static void	complex_stereo_downmix_prev (AACDecContext *ac, ChannelElement *cpe, float *dmix_re)
static void	complex_stereo_downmix_cur (AACDecContext *ac, ChannelElement *cpe, float *dmix_re)
static void	complex_stereo_interpolate_imag (float *im, float *re, const float f[7], int len, int factor_even, int factor_odd)
static void	apply_complex_stereo (AACDecContext *ac, ChannelElement *cpe)
static const float *	complex_stereo_get_filter (ChannelElement *cpe, int is_prev)
static void	spectrum_decode (AACDecContext *ac, AACUSACConfig *usac, ChannelElement *cpe, int nb_channels)
static void	decode_tsd (GetBitContext *gb, int *data, int nb_tr_slots, int nb_slots)
static int	parse_mps212 (AACDecContext *ac, AACUSACConfig *usac, AACUsacMPSData *mps, AACUsacElemConfig *ec, GetBitContext *gb, int frame_indep_flag)
static int	decode_usac_core_coder (AACDecContext *ac, AACUSACConfig *usac, AACUsacElemConfig *ec, ChannelElement *che, GetBitContext *gb, int indep_flag, int nb_channels)
static int	parse_audio_preroll (AACDecContext *ac, GetBitContext *gb)
static int	parse_ext_ele (AACDecContext *ac, AACUsacElemConfig *e, GetBitContext *gb)
int	ff_aac_usac_decode_frame (AVCodecContext *avctx, AACDecContext *ac, GetBitContext *gb, int *got_frame_ptr)

Variables
static enum AVChannel	usac_ch_pos_to_av [64]
static const uint8_t	mps_fr_nb_bands [8]
static const uint8_t	mps_fr_stride_smg [4]

Macro Definition Documentation

SFB_PER_PRED_BAND

#define SFB_PER_PRED_BAND   2

Definition at line 37 of file aacdec_usac.c.

Function Documentation

get_escaped_value()

static uint32_t get_escaped_value ( GetBitContext *  gb, int  nb1, int  nb2, int  nb3  )

inlinestatic

Definition at line 39 of file aacdec_usac.c.

Referenced by decode_usac_extension(), ff_aac_usac_config_decode(), and parse_audio_preroll().

decode_loudness_info()

static int decode_loudness_info ( AACDecContext *  ac, AACUSACLoudnessInfo *  info, GetBitContext *  gb  )

static

Definition at line 88 of file aacdec_usac.c.

Referenced by decode_loudness_set().

decode_loudness_set()

static int decode_loudness_set ( AACDecContext *  ac, AACUSACConfig *  usac, GetBitContext *  gb  )

static

Definition at line 114 of file aacdec_usac.c.

Referenced by ff_aac_usac_config_decode().

decode_usac_sbr_data()

static int decode_usac_sbr_data ( AACDecContext *  ac, AACUsacElemConfig *  e, GetBitContext *  gb  )

static

Definition at line 153 of file aacdec_usac.c.

Referenced by decode_usac_element_pair(), and ff_aac_usac_config_decode().

decode_usac_element_core()

static void decode_usac_element_core ( AACUsacElemConfig *  e, GetBitContext *  gb, int  sbr_ratio  )

static

Definition at line 196 of file aacdec_usac.c.

Referenced by ff_aac_usac_config_decode().

decode_usac_element_pair()

static int decode_usac_element_pair ( AACDecContext *  ac, AACUsacElemConfig *  e, GetBitContext *  gb  )

static

Definition at line 205 of file aacdec_usac.c.

Referenced by ff_aac_usac_config_decode().

decode_usac_extension()

static int decode_usac_extension ( AACDecContext *  ac, AACUsacElemConfig *  e, GetBitContext *  gb  )

static

Definition at line 256 of file aacdec_usac.c.

Referenced by ff_aac_usac_config_decode().

ff_aac_usac_reset_state()

int ff_aac_usac_reset_state	(	AACDecContext *	ac,
		OutputConfiguration *	oc
	)

Definition at line 295 of file aacdec_usac.c.

Referenced by ff_aac_usac_config_decode(), and flush().

ff_aac_usac_config_decode()

int ff_aac_usac_config_decode	(	AACDecContext *	ac,
		AVCodecContext *	avctx,
		GetBitContext *	gb,
		OutputConfiguration *	oc,
		int	channel_config
	)

Definition at line 354 of file aacdec_usac.c.

Referenced by decode_audio_specific_config_gb(), and parse_audio_preroll().

decode_usac_scale_factors()

static int decode_usac_scale_factors ( AACDecContext *  ac, SingleChannelElement *  sce, GetBitContext *  gb, uint8_t  global_gain  )

static

Definition at line 580 of file aacdec_usac.c.

Referenced by decode_usac_core_coder().

decode_spectrum_ac()

static int decode_spectrum_ac ( AACDecContext *  s, float  coef[1024], GetBitContext *  gb, AACArithState *  state, int  reset, uint16_t  len, uint16_t  N  )

static

Decode and dequantize arithmetically coded, uniformly quantized value.

Parameters

coef	array of dequantized, scaled spectral data
sf	array of scalefactors or intensity stereo positions

Returns

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

Definition at line 613 of file aacdec_usac.c.

Referenced by decode_usac_core_coder().

decode_usac_stereo_cplx()

static int decode_usac_stereo_cplx ( AACDecContext *  ac, AACUsacStereo *  us, ChannelElement *  cpe, GetBitContext *  gb, int  num_window_groups, int  prev_num_window_groups, int  indep_flag  )

static

Definition at line 708 of file aacdec_usac.c.

Referenced by decode_usac_stereo_info().

setup_sce()

static int setup_sce ( AACDecContext *  ac, SingleChannelElement *  sce, AACUSACConfig *  usac  )

static

Definition at line 799 of file aacdec_usac.c.

Referenced by decode_usac_core_coder(), and decode_usac_stereo_info().

decode_usac_stereo_info()

static int decode_usac_stereo_info ( AACDecContext *  ac, AACUSACConfig *  usac, AACUsacElemConfig *  ec, ChannelElement *  cpe, GetBitContext *  gb, int  indep_flag  )

static

Definition at line 862 of file aacdec_usac.c.

Referenced by decode_usac_core_coder().

noise_random_sign()

static float noise_random_sign ( unsigned int *  seed )

inlinestatic

Definition at line 1004 of file aacdec_usac.c.

Referenced by apply_noise_fill().

apply_noise_fill()

static void apply_noise_fill ( AACDecContext *  ac, SingleChannelElement *  sce, AACUsacElemData *  ue  )

static

Definition at line 1012 of file aacdec_usac.c.

Referenced by spectrum_scale().

spectrum_scale()

static void spectrum_scale ( AACDecContext *  ac, SingleChannelElement *  sce, AACUsacElemData *  ue  )

static

Definition at line 1054 of file aacdec_usac.c.

Referenced by spectrum_decode().

complex_stereo_downmix_prev()

static void complex_stereo_downmix_prev ( AACDecContext *  ac, ChannelElement *  cpe, float *  dmix_re  )

static

Definition at line 1084 of file aacdec_usac.c.

Referenced by spectrum_decode().

complex_stereo_downmix_cur()

static void complex_stereo_downmix_cur ( AACDecContext *  ac, ChannelElement *  cpe, float *  dmix_re  )

static

Definition at line 1115 of file aacdec_usac.c.

Referenced by spectrum_decode().

complex_stereo_interpolate_imag()

static void complex_stereo_interpolate_imag ( float *  im, float *  re, const float  f[7], int  len, int  factor_even, int  factor_odd  )

static

Definition at line 1155 of file aacdec_usac.c.

Referenced by spectrum_decode().

apply_complex_stereo()

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

static

Definition at line 1209 of file aacdec_usac.c.

Referenced by spectrum_decode().

complex_stereo_get_filter()

static const float* complex_stereo_get_filter ( ChannelElement *  cpe, int  is_prev  )

static

Definition at line 1261 of file aacdec_usac.c.

Referenced by spectrum_decode().

spectrum_decode()

static void spectrum_decode ( AACDecContext *  ac, AACUSACConfig *  usac, ChannelElement *  cpe, int  nb_channels  )

static

Definition at line 1301 of file aacdec_usac.c.

Referenced by decode_usac_core_coder().

decode_tsd()

static void decode_tsd ( GetBitContext *  gb, int *  data, int  nb_tr_slots, int  nb_slots  )

static

Definition at line 1375 of file aacdec_usac.c.

Referenced by parse_mps212().

parse_mps212()

static int parse_mps212 ( AACDecContext *  ac, AACUSACConfig *  usac, AACUsacMPSData *  mps, AACUsacElemConfig *  ec, GetBitContext *  gb, int  frame_indep_flag  )

static

Definition at line 1405 of file aacdec_usac.c.

Referenced by decode_usac_core_coder().

decode_usac_core_coder()

static int decode_usac_core_coder ( AACDecContext *  ac, AACUSACConfig *  usac, AACUsacElemConfig *  ec, ChannelElement *  che, GetBitContext *  gb, int  indep_flag, int  nb_channels  )

static

Definition at line 1525 of file aacdec_usac.c.

Referenced by ff_aac_usac_decode_frame().

parse_audio_preroll()

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

static

Definition at line 1682 of file aacdec_usac.c.

Referenced by parse_ext_ele().

parse_ext_ele()

static int parse_ext_ele ( AACDecContext *  ac, AACUsacElemConfig *  e, GetBitContext *  gb  )

static

Definition at line 1756 of file aacdec_usac.c.

Referenced by ff_aac_usac_decode_frame().

ff_aac_usac_decode_frame()

int ff_aac_usac_decode_frame	(	AVCodecContext *	avctx,
		AACDecContext *	ac,
		GetBitContext *	gb,
		int *	got_frame_ptr
	)

Definition at line 1844 of file aacdec_usac.c.

Referenced by aac_decode_frame_int(), and parse_audio_preroll().

Variable Documentation

usac_ch_pos_to_av

enum AVChannel usac_ch_pos_to_av[64]

static

Definition at line 53 of file aacdec_usac.c.

Referenced by ff_aac_usac_config_decode().

mps_fr_nb_bands

const uint8_t mps_fr_nb_bands[8]

static

Initial value:

= {
    255 , 28, 20, 14, 10, 7, 5, 4,
}

Definition at line 1367 of file aacdec_usac.c.

Referenced by parse_mps212().

mps_fr_stride_smg

const uint8_t mps_fr_stride_smg[4]

static

Initial value:

= {
    1, 2, 5, 28,
}

Definition at line 1371 of file aacdec_usac.c.

Referenced by parse_mps212().