celt_decoder.c | Explore in Territory

/* Copyright (c) 2007-2008 CSIRO
   Copyright (c) 2007-2010 Xiph.Org Foundation
   Copyright (c) 2008 Gregory Maxwell
   Written by Jean-Marc Valin and Gregory Maxwell */
/*
   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 COPYRIGHT OWNER
   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 CELT_DECODER_C

#include "cpu_support.h"
#include "os_support.h"
#include "mdct.h"
#include <math.h>
#include "celt.h"
#include "pitch.h"
#include "bands.h"
#include "modes.h"
#include "entcode.h"
#include "quant_bands.h"
#include "rate.h"
#include "stack_alloc.h"
#include "mathops.h"
#include "float_cast.h"
#include <stdarg.h>
#include "celt_lpc.h"
#include "vq.h"

/* The maximum pitch lag to allow in the pitch-based PLC. It's possible to save
   CPU time in the PLC pitch search by making this smaller than MAX_PERIOD. The
   current value corresponds to a pitch of 66.67 Hz. */
#define PLC_PITCH_LAG_MAX …
/* The minimum pitch lag to allow in the pitch-based PLC. This corresponds to a
   pitch of 480 Hz. */
#define PLC_PITCH_LAG_MIN …

#if defined(SMALL_FOOTPRINT) && defined(FIXED_POINT)
#define NORM_ALIASING_HACK
#endif
/**********************************************************************/
/*                                                                    */
/*                             DECODER                                */
/*                                                                    */
/**********************************************************************/
#define DECODE_BUFFER_SIZE …

/** Decoder state
 @brief Decoder state
 */
struct OpusCustomDecoder { … };

#if defined(ENABLE_HARDENING) || defined(ENABLE_ASSERTIONS)
/* Make basic checks on the CELT state to ensure we don't end
   up writing all over memory. */
void validate_celt_decoder(CELTDecoder *st)
{ … }
#endif

int celt_decoder_get_size(int channels)
{ … }

OPUS_CUSTOM_NOSTATIC int opus_custom_decoder_get_size(const CELTMode *mode, int channels)
{ … }

#ifdef CUSTOM_MODES
CELTDecoder *opus_custom_decoder_create(const CELTMode *mode, int channels, int *error)
{
   int ret;
   CELTDecoder *st = (CELTDecoder *)opus_alloc(opus_custom_decoder_get_size(mode, channels));
   ret = opus_custom_decoder_init(st, mode, channels);
   if (ret != OPUS_OK)
   {
      opus_custom_decoder_destroy(st);
      st = NULL;
   }
   if (error)
      *error = ret;
   return st;
}
#endif /* CUSTOM_MODES */

int celt_decoder_init(CELTDecoder *st, opus_int32 sampling_rate, int channels)
{ … }

OPUS_CUSTOM_NOSTATIC int opus_custom_decoder_init(CELTDecoder *st, const CELTMode *mode, int channels)
{ … }

#ifdef CUSTOM_MODES
void opus_custom_decoder_destroy(CELTDecoder *st)
{
   opus_free(st);
}
#endif /* CUSTOM_MODES */

#ifndef CUSTOM_MODES
/* Special case for stereo with no downsampling and no accumulation. This is
   quite common and we can make it faster by processing both channels in the
   same loop, reducing overhead due to the dependency loop in the IIR filter. */
static void deemphasis_stereo_simple(celt_sig *in[], opus_val16 *pcm, int N, const opus_val16 coef0,
      celt_sig *mem)
{ … }
#endif

#ifndef RESYNTH
static
#endif
void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, int downsample, const opus_val16 *coef,
      celt_sig *mem, int accum)
{ … }

#ifndef RESYNTH
static
#endif
void celt_synthesis(const CELTMode *mode, celt_norm *X, celt_sig * out_syn[],
                    opus_val16 *oldBandE, int start, int effEnd, int C, int CC,
                    int isTransient, int LM, int downsample,
                    int silence, int arch)
{ … }

static void tf_decode(int start, int end, int isTransient, int *tf_res, int LM, ec_dec *dec)
{ … }

static int celt_plc_pitch_search(celt_sig *decode_mem[2], int C, int arch)
{ … }

static void celt_decode_lost(CELTDecoder * OPUS_RESTRICT st, int N, int LM)
{ … }

int celt_decode_with_ec(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data,
      int len, opus_val16 * OPUS_RESTRICT pcm, int frame_size, ec_dec *dec, int accum)
{ … }


#ifdef CUSTOM_MODES

#ifdef FIXED_POINT
int opus_custom_decode(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, opus_int16 * OPUS_RESTRICT pcm, int frame_size)
{
   return celt_decode_with_ec(st, data, len, pcm, frame_size, NULL, 0);
}

#ifndef DISABLE_FLOAT_API
int opus_custom_decode_float(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, float * OPUS_RESTRICT pcm, int frame_size)
{
   int j, ret, C, N;
   VARDECL(opus_int16, out);
   ALLOC_STACK;

   if (pcm==NULL)
      return OPUS_BAD_ARG;

   C = st->channels;
   N = frame_size;

   ALLOC(out, C*N, opus_int16);
   ret=celt_decode_with_ec(st, data, len, out, frame_size, NULL, 0);
   if (ret>0)
      for (j=0;j<C*ret;j++)
         pcm[j]=out[j]*(1.f/32768.f);

   RESTORE_STACK;
   return ret;
}
#endif /* DISABLE_FLOAT_API */

#else

int opus_custom_decode_float(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, float * OPUS_RESTRICT pcm, int frame_size)
{
   return celt_decode_with_ec(st, data, len, pcm, frame_size, NULL, 0);
}

int opus_custom_decode(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, opus_int16 * OPUS_RESTRICT pcm, int frame_size)
{
   int j, ret, C, N;
   VARDECL(celt_sig, out);
   ALLOC_STACK;

   if (pcm==NULL)
      return OPUS_BAD_ARG;

   C = st->channels;
   N = frame_size;
   ALLOC(out, C*N, celt_sig);

   ret=celt_decode_with_ec(st, data, len, out, frame_size, NULL, 0);

   if (ret>0)
      for (j=0;j<C*ret;j++)
         pcm[j] = FLOAT2INT16 (out[j]);

   RESTORE_STACK;
   return ret;
}

#endif
#endif /* CUSTOM_MODES */

int opus_custom_decoder_ctl(CELTDecoder * OPUS_RESTRICT st, int request, ...)
{ … }
chromium/third_party/opus/src/celt/celt_decoder.c
