chromium/third_party/opus/src/src/opus_decoder.c

/* Copyright (c) 2010 Xiph.Org Foundation, Skype Limited
   Written by Jean-Marc Valin and Koen Vos */
/*
   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

#ifndef OPUS_BUILD
# error "OPUS_BUILD _MUST_ be defined to build Opus. This probably means you need other defines as well, as in a config.h. See the included build files for details."
#endif

#if defined(__GNUC__) && (__GNUC__ >= 2) && !defined(__OPTIMIZE__) && !defined(OPUS_WILL_BE_SLOW)
# pragma message "You appear to be compiling without optimization, if so opus will be very slow."
#endif

#include <stdarg.h>
#include "celt.h"
#include "opus.h"
#include "entdec.h"
#include "modes.h"
#include "API.h"
#include "stack_alloc.h"
#include "float_cast.h"
#include "opus_private.h"
#include "os_support.h"
#include "structs.h"
#include "define.h"
#include "mathops.h"
#include "cpu_support.h"

struct OpusDecoder { … };

#if defined(ENABLE_HARDENING) || defined(ENABLE_ASSERTIONS)
static void validate_opus_decoder(OpusDecoder *st)
{ … }
#define VALIDATE_OPUS_DECODER(st) …
#else
#define VALIDATE_OPUS_DECODER …
#endif

int opus_decoder_get_size(int channels)
{ … }

int opus_decoder_init(OpusDecoder *st, opus_int32 Fs, int channels)
{ … }

OpusDecoder *opus_decoder_create(opus_int32 Fs, int channels, int *error)
{ … }

static void smooth_fade(const opus_val16 *in1, const opus_val16 *in2,
      opus_val16 *out, int overlap, int channels,
      const opus_val16 *window, opus_int32 Fs)
{ … }

static int opus_packet_get_mode(const unsigned char *data)
{ … }

static int opus_decode_frame(OpusDecoder *st, const unsigned char *data,
      opus_int32 len, opus_val16 *pcm, int frame_size, int decode_fec)
{ … }

int opus_decode_native(OpusDecoder *st, const unsigned char *data,
      opus_int32 len, opus_val16 *pcm, int frame_size, int decode_fec,
      int self_delimited, opus_int32 *packet_offset, int soft_clip)
{ … }

#ifdef FIXED_POINT

int opus_decode(OpusDecoder *st, const unsigned char *data,
      opus_int32 len, opus_val16 *pcm, int frame_size, int decode_fec)
{
   if(frame_size<=0)
      return OPUS_BAD_ARG;
   return opus_decode_native(st, data, len, pcm, frame_size, decode_fec, 0, NULL, 0);
}

#ifndef DISABLE_FLOAT_API
int opus_decode_float(OpusDecoder *st, const unsigned char *data,
      opus_int32 len, float *pcm, int frame_size, int decode_fec)
{
   VARDECL(opus_int16, out);
   int ret, i;
   int nb_samples;
   ALLOC_STACK;

   if(frame_size<=0)
   {
      RESTORE_STACK;
      return OPUS_BAD_ARG;
   }
   if (data != NULL && len > 0 && !decode_fec)
   {
      nb_samples = opus_decoder_get_nb_samples(st, data, len);
      if (nb_samples>0)
         frame_size = IMIN(frame_size, nb_samples);
      else
         return OPUS_INVALID_PACKET;
   }
   celt_assert(st->channels == 1 || st->channels == 2);
   ALLOC(out, frame_size*st->channels, opus_int16);

   ret = opus_decode_native(st, data, len, out, frame_size, decode_fec, 0, NULL, 0);
   if (ret > 0)
   {
      for (i=0;i<ret*st->channels;i++)
         pcm[i] = (1.f/32768.f)*(out[i]);
   }
   RESTORE_STACK;
   return ret;
}
#endif


#else
int opus_decode(OpusDecoder *st, const unsigned char *data,
      opus_int32 len, opus_int16 *pcm, int frame_size, int decode_fec)
{ … }

int opus_decode_float(OpusDecoder *st, const unsigned char *data,
      opus_int32 len, opus_val16 *pcm, int frame_size, int decode_fec)
{ … }

#endif

int opus_decoder_ctl(OpusDecoder *st, int request, ...)
{ … }

void opus_decoder_destroy(OpusDecoder *st)
{ … }


int opus_packet_get_bandwidth(const unsigned char *data)
{ … }

int opus_packet_get_nb_channels(const unsigned char *data)
{ … }

int opus_packet_get_nb_frames(const unsigned char packet[], opus_int32 len)
{ … }

int opus_packet_get_nb_samples(const unsigned char packet[], opus_int32 len,
      opus_int32 Fs)
{ … }

int opus_decoder_get_nb_samples(const OpusDecoder *dec,
      const unsigned char packet[], opus_int32 len)
{ … }