FFmpeg
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#include <math.h>
#include <string.h>
#include "libavutil/attributes.h"
#include "libavutil/thread.h"
#include "atrac.h"
Go to the source code of this file.
Functions | |
static av_cold void | atrac_generate_tables (void) |
av_cold void | ff_atrac_generate_tables (void) |
Generate common tables. More... | |
av_cold void | ff_atrac_init_gain_compensation (AtracGCContext *gctx, int id2exp_offset, int loc_scale) |
Initialize gain compensation context. More... | |
void | ff_atrac_gain_compensation (AtracGCContext *gctx, float *in, float *prev, AtracGainInfo *gc_now, AtracGainInfo *gc_next, int num_samples, float *out) |
Apply gain compensation and perform the MDCT overlapping part. More... | |
void | ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp) |
Quadrature mirror synthesis filter. More... | |
Variables | |
float | ff_atrac_sf_table [64] |
static float | qmf_window [48] |
static const float | qmf_48tap_half [24] |
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Definition at line 48 of file atrac.c.
Referenced by ff_atrac_generate_tables().
av_cold void ff_atrac_generate_tables | ( | void | ) |
Generate common tables.
Definition at line 61 of file atrac.c.
Referenced by atrac1_decode_init(), and atrac3_init_static_data().
av_cold void ff_atrac_init_gain_compensation | ( | AtracGCContext * | gctx, |
int | id2exp_offset, | ||
int | loc_scale | ||
) |
Initialize gain compensation context.
gctx | pointer to gain compensation context to initialize |
id2exp_offset | offset for converting level index into level exponent |
loc_scale | location size factor |
Definition at line 67 of file atrac.c.
Referenced by atrac3_decode_init(), and atrac3p_decode_init().
void ff_atrac_gain_compensation | ( | AtracGCContext * | gctx, |
float * | in, | ||
float * | prev, | ||
AtracGainInfo * | gc_now, | ||
AtracGainInfo * | gc_next, | ||
int | num_samples, | ||
float * | out | ||
) |
Apply gain compensation and perform the MDCT overlapping part.
gctx | pointer to gain compensation context |
in | input buffer |
prev | previous buffer to perform overlap against |
gc_now | gain control information for current frame |
gc_next | gain control information for next frame |
num_samples | number of samples to process |
out | output data goes here |
Definition at line 85 of file atrac.c.
Referenced by decode_channel_sound_unit(), and reconstruct_frame().
void ff_atrac_iqmf | ( | float * | inlo, |
float * | inhi, | ||
unsigned int | nIn, | ||
float * | pOut, | ||
float * | delayBuf, | ||
float * | temp | ||
) |
Quadrature mirror synthesis filter.
inlo | lower part of spectrum |
inhi | higher part of spectrum |
nIn | size of spectrum buffer |
pOut | out buffer |
delayBuf | delayBuf buffer |
temp | temp buffer |
Definition at line 128 of file atrac.c.
Referenced by al_decode_frame(), at1_subband_synthesis(), and decode_frame().
float ff_atrac_sf_table[64] |
Definition at line 36 of file atrac.c.
Referenced by at1_unpack_dequant(), atrac_generate_tables(), decode_spectrum(), and decode_tonal_components().
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Definition at line 37 of file atrac.c.
Referenced by atrac_generate_tables(), and ff_atrac_iqmf().
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static |
Definition at line 39 of file atrac.c.
Referenced by atrac_generate_tables().