aacdec_fixed.c File Reference

#include "libavutil/fixed_dsp.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "fft.h"
#include "lpc.h"
#include "kbdwin.h"
#include "sinewin_fixed_tablegen.h"
#include "aac.h"
#include "aactab.h"
#include "aacdectab.h"
#include "adts_header.h"
#include "cbrt_data.h"
#include "sbr.h"
#include "aacsbr.h"
#include "mpeg4audio.h"
#include "profiles.h"
#include "libavutil/intfloat.h"
#include <math.h>
#include <string.h>
#include "aacdec_template.c"

Go to the source code of this file.

Macros
#define	FFT_FLOAT   0
#define	USE_FIXED   1

Functions
static av_always_inline void	reset_predict_state (PredictorState *ps)
static int *	DEC_SPAIR (int *dst, unsigned idx)
static int *	DEC_SQUAD (int *dst, unsigned idx)
static int *	DEC_UPAIR (int *dst, unsigned idx, unsigned sign)
static int *	DEC_UQUAD (int *dst, unsigned idx, unsigned sign)
static void	vector_pow43 (int *coefs, int len)
static void	subband_scale (int *dst, int *src, int scale, int offset, int len, void *log_context)
static void	noise_scale (int *coefs, int scale, int band_energy, int len)
static av_always_inline SoftFloat	flt16_round (SoftFloat pf)
static av_always_inline SoftFloat	flt16_even (SoftFloat pf)
static av_always_inline SoftFloat	flt16_trunc (SoftFloat pf)
static av_always_inline void	predict (PredictorState *ps, int *coef, int output_enable)
static void	apply_dependent_coupling_fixed (AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)
	Apply dependent channel coupling (applied before IMDCT). More...
static void	apply_independent_coupling_fixed (AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)
	Apply independent channel coupling (applied after IMDCT). More...

Variables
static int	ff_aac_kbd_long_1024 [1024]
static int	ff_aac_kbd_short_128 [128]
static const int	exp2tab [4] = { Q31(1.0000000000/2), Q31(1.1892071150/2), Q31(1.4142135624/2), Q31(1.6817928305/2) }
static const int	cce_scale_fixed [8]
const AVCodec	ff_aac_fixed_decoder

Detailed Description

AAC decoder

Author

Oded Shimon ( ods15 ods15 dyndns org )

Maxim Gavrilov ( maxim.gavrilov gmail com )

Fixed point implementation

Author

Stanislav Ocovaj ( stanislav.ocovaj imgtec com )

Definition in file aacdec_fixed.c.

Macro Definition Documentation

FFT_FLOAT

#define FFT_FLOAT   0

Definition at line 61 of file aacdec_fixed.c.

USE_FIXED

#define USE_FIXED   1

Definition at line 62 of file aacdec_fixed.c.

Function Documentation

reset_predict_state()

static av_always_inline void reset_predict_state ( PredictorState *  ps )

static

Definition at line 91 of file aacdec_fixed.c.

DEC_SPAIR()

static int* DEC_SPAIR ( int *  dst, unsigned  idx  )

inlinestatic

Definition at line 109 of file aacdec_fixed.c.

Referenced by decode_spectrum_and_dequant().

DEC_SQUAD()

static int* DEC_SQUAD ( int *  dst, unsigned  idx  )

inlinestatic

Definition at line 117 of file aacdec_fixed.c.

Referenced by decode_spectrum_and_dequant().

DEC_UPAIR()

static int* DEC_UPAIR ( int *  dst, unsigned  idx, unsigned  sign  )

inlinestatic

Definition at line 127 of file aacdec_fixed.c.

Referenced by decode_spectrum_and_dequant().

DEC_UQUAD()

static int* DEC_UQUAD ( int *  dst, unsigned  idx, unsigned  sign  )

inlinestatic

Definition at line 135 of file aacdec_fixed.c.

Referenced by decode_spectrum_and_dequant().

vector_pow43()

static void vector_pow43 ( int *  coefs, int  len  )

static

Definition at line 153 of file aacdec_fixed.c.

Referenced by aacdec_init().

subband_scale()

static void subband_scale ( int *  dst, int *  src, int  scale, int  offset, int  len, void *  log_context  )

static

Definition at line 167 of file aacdec_fixed.c.

Referenced by aacdec_init().

noise_scale()

static void noise_scale ( int *  coefs, int  scale, int  band_energy, int  len  )

static

Definition at line 198 of file aacdec_fixed.c.

Referenced by decode_spectrum_and_dequant().

flt16_round()

static av_always_inline SoftFloat flt16_round ( SoftFloat  pf )

static

Definition at line 239 of file aacdec_fixed.c.

Referenced by predict().

flt16_even()

static av_always_inline SoftFloat flt16_even ( SoftFloat  pf )

static

Definition at line 253 of file aacdec_fixed.c.

Referenced by predict().

flt16_trunc()

static av_always_inline SoftFloat flt16_trunc ( SoftFloat  pf )

static

Definition at line 267 of file aacdec_fixed.c.

Referenced by predict().

predict()

static av_always_inline void predict ( PredictorState *  ps, int *  coef, int  output_enable  )

static

Definition at line 281 of file aacdec_fixed.c.

apply_dependent_coupling_fixed()

static void apply_dependent_coupling_fixed ( AACContext *  ac, SingleChannelElement *  target, ChannelElement *  cce, int  index  )

static

Apply dependent channel coupling (applied before IMDCT).

Parameters

index

index into coupling gain array

Definition at line 356 of file aacdec_fixed.c.

apply_independent_coupling_fixed()

static void apply_independent_coupling_fixed ( AACContext *  ac, SingleChannelElement *  target, ChannelElement *  cce, int  index  )

static

Apply independent channel coupling (applied after IMDCT).

Parameters

index

index into coupling gain array

Definition at line 420 of file aacdec_fixed.c.

Variable Documentation

ff_aac_kbd_long_1024

int ff_aac_kbd_long_1024[1024]

static

Definition at line 88 of file aacdec_fixed.c.

ff_aac_kbd_short_128

int ff_aac_kbd_short_128[128]

static

Definition at line 89 of file aacdec_fixed.c.

exp2tab

const int exp2tab[4] = { Q31(1.0000000000/2), Q31(1.1892071150/2), Q31(1.4142135624/2), Q31(1.6817928305/2) }

static

Definition at line 107 of file aacdec_fixed.c.

Referenced by noise_scale(), and subband_scale().

cce_scale_fixed

const int cce_scale_fixed[8]

static

Initial value:

= {
    Q30(1.0),          
    Q30(1.0905077327), 
    Q30(1.1892071150), 
    Q30(1.2968395547), 
    Q30(1.4142135624), 
    Q30(1.5422108254), 
    Q30(1.6817928305), 
    Q30(1.8340080864), 
}

Definition at line 340 of file aacdec_fixed.c.

Referenced by apply_dependent_coupling_fixed(), and apply_independent_coupling_fixed().

ff_aac_fixed_decoder

const AVCodec ff_aac_fixed_decoder

Initial value:

= {
    .name            = "aac_fixed",
    .long_name       = NULL_IF_CONFIG_SMALL("AAC (Advanced Audio Coding)"),
    .type            = AVMEDIA_TYPE_AUDIO,
    .id              = AV_CODEC_ID_AAC,
    .priv_data_size  = sizeof(AACContext),
    .init            = aac_decode_init,
    .close           = aac_decode_close,
    .decode          = aac_decode_frame,
    .sample_fmts     = (const enum AVSampleFormat[]) {
        AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_NONE
    },
    .capabilities    = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1,
    .caps_internal   = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
    .channel_layouts = aac_channel_layout,
    .profiles        = NULL_IF_CONFIG_SMALL(ff_aac_profiles),
    .flush = flush,
}

Definition at line 453 of file aacdec_fixed.c.