chromium/third_party/opus/src/src/analysis.c

/* Copyright (c) 2011 Xiph.Org Foundation
   Written by Jean-Marc Valin */
/*
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#define ANALYSIS_C

#ifdef MLP_TRAINING
#include <stdio.h>
#endif

#include "mathops.h"
#include "kiss_fft.h"
#include "celt.h"
#include "modes.h"
#include "arch.h"
#include "quant_bands.h"
#include "analysis.h"
#include "mlp.h"
#include "stack_alloc.h"
#include "float_cast.h"

#ifndef M_PI
#define M_PI …
#endif

#ifndef DISABLE_FLOAT_API

#define TRANSITION_PENALTY …

static const float dct_table[128] = …;

static const float analysis_window[240] = …;

static const int tbands[NB_TBANDS+1] = …;

#define NB_TONAL_SKIP_BANDS …

static opus_val32 silk_resampler_down2_hp(
    opus_val32                  *S,                 /* I/O  State vector [ 2 ]                                          */
    opus_val32                  *out,               /* O    Output signal [ floor(len/2) ]                              */
    const opus_val32            *in,                /* I    Input signal [ len ]                                        */
    int                         inLen               /* I    Number of input samples                                     */
)
{ … }

static opus_val32 downmix_and_resample(downmix_func downmix, const void *_x, opus_val32 *y, opus_val32 S[3], int subframe, int offset, int c1, int c2, int C, int Fs)
{ … }

void tonality_analysis_init(TonalityAnalysisState *tonal, opus_int32 Fs)
{ … }

void tonality_analysis_reset(TonalityAnalysisState *tonal)
{ … }

void tonality_get_info(TonalityAnalysisState *tonal, AnalysisInfo *info_out, int len)
{ … }

static const float std_feature_bias[9] = …;

#define LEAKAGE_OFFSET …
#define LEAKAGE_SLOPE …

#ifdef FIXED_POINT
/* For fixed-point, the input is +/-2^15 shifted up by SIG_SHIFT, so we need to
   compensate for that in the energy. */
#define SCALE_COMPENS …
#define SCALE_ENER …
#else
#define SCALE_ENER(e) …
#endif

#ifdef FIXED_POINT
static int is_digital_silence32(const opus_val32* pcm, int frame_size, int channels, int lsb_depth)
{
   int silence = 0;
   opus_val32 sample_max = 0;
#ifdef MLP_TRAINING
   return 0;
#endif
   sample_max = celt_maxabs32(pcm, frame_size*channels);

   silence = (sample_max == 0);
   (void)lsb_depth;
   return silence;
}
#else
#define is_digital_silence32(pcm, frame_size, channels, lsb_depth) …
#endif

static void tonality_analysis(TonalityAnalysisState *tonal, const CELTMode *celt_mode, const void *x, int len, int offset, int c1, int c2, int C, int lsb_depth, downmix_func downmix)
{ … }

void run_analysis(TonalityAnalysisState *analysis, const CELTMode *celt_mode, const void *analysis_pcm,
                 int analysis_frame_size, int frame_size, int c1, int c2, int C, opus_int32 Fs,
                 int lsb_depth, downmix_func downmix, AnalysisInfo *analysis_info)
{ … }

#endif /* DISABLE_FLOAT_API */