/* Copyright (C) 2002 Jean-Marc Valin 

   File: wav_io.c

   Routines to handle wav (RIFF) headers

   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.

   - Neither the name of the Xiph.org Foundation nor the names of its

   contributors may be used to endorse or promote products derived from

   this software without specific prior written permission.

   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

#include <stdio.h>

#include <string.h>

#include "celt_types.h"

#include "wav_io.h"

int read_wav_header(FILE *file, int *rate, int *channels, int *format, celt_int32_t *size)

{

   char ch[5];

   celt_int32_t itmp;

   celt_int16_t stmp;

   celt_int32_t bpersec;

   celt_int16_t balign;

   int skip_bytes;

   int i;

   ch[4]=0;

#if 0

   fread(ch, 1, 4, file);

   if (strcmp(ch, "RIFF")!=0)

   {

      fseek(file, 0, SEEK_SET);

      return 0;

   }

   fread(&itmp, 4, 1, file);

   *size = le_int(itmp-36);

   fread(ch, 1, 4, file);

   if (strcmp(ch, "WAVE")!=0)

   {

      fprintf (stderr, "RIFF file is not a WAVE file\n");

      return -1;

   }

#endif

   fread(ch, 1, 4, file);

   while (strcmp(ch, "fmt ")!=0)

   {

      fread(&itmp, 4, 1, file);

      itmp = le_int(itmp);

      /*fprintf (stderr, "skip=%d\n", itmp);*/

      /*strange way of seeking, but it works even for pipes*/

      for (i=0;i

         fgetc(file);

      /*fseek(file, itmp, SEEK_CUR);*/

      fread(ch, 1, 4, file);

      if (feof(file))

      {

         fprintf (stderr, "Corrupted WAVE file: no \"fmt \"\n");

         return -1;

      }

   }

   /*if (strcmp(ch, "fmt ")!=0)

   {

      fprintf (stderr, "Corrupted WAVE file: no \"fmt \"\n");

      return -1;

      }*/

   fread(&itmp, 4, 1, file);

   itmp = le_int(itmp);

   skip_bytes=itmp-16;

   /*fprintf (stderr, "skip=%d\n", skip_bytes);*/

   fread(&stmp, 2, 1, file);

   stmp = le_short(stmp);

   if (stmp!=1)

   {

      fprintf (stderr, "Only PCM encoding is supported\n");

      return -1;

   }

   fread(&stmp, 2, 1, file);

   stmp = le_short(stmp);

   *channels = stmp;

   if (stmp>2)

   {

      fprintf (stderr, "Only mono and (intensity) stereo supported\n");

      return -1;

   }

   fread(&itmp, 4, 1, file);

   itmp = le_int(itmp);

   *rate = itmp;

   fread(&itmp, 4, 1, file);

   bpersec = le_int(itmp);

   fread(&stmp, 2, 1, file);

   balign = le_short(stmp);

   fread(&stmp, 2, 1, file);

   stmp = le_short(stmp);

   if (stmp!=16 && stmp!=8)

   {

      fprintf (stderr, "Only 8/16-bit linear supported\n");

      return -1;

   }

   *format=stmp;

   if (bpersec!=*rate**channels*stmp/8)

   {

      fprintf (stderr, "Corrupted header: ByteRate mismatch\n");

      return -1;

   }

   if (balign!=*channels*stmp/8)

   {

      fprintf (stderr, "Corrupted header: BlockAlign mismatch\n");

      return -1;

   }

   /*strange way of seeking, but it works even for pipes*/

   if (skip_bytes>0)

      for (i=0;i

         fgetc(file);

   /*fseek(file, skip_bytes, SEEK_CUR);*/

   fread(ch, 1, 4, file);

   while (strcmp(ch, "data")!=0)

   {

      fread(&itmp, 4, 1, file);

      itmp = le_int(itmp);

      /*strange way of seeking, but it works even for pipes*/

      for (i=0;i

         fgetc(file);

      /*fseek(file, itmp, SEEK_CUR);*/

      fread(ch, 1, 4, file);

      if (feof(file))

      {

         fprintf (stderr, "Corrupted WAVE file: no \"data\"\n");

         return -1;

      }

   }

   /*Ignore this for now*/

   fread(&itmp, 4, 1, file);

   itmp = le_int(itmp);

   *size=itmp;

   return 1;

}

void write_wav_header(FILE *file, int rate, int channels, int format, int size)

{

   char ch[5];

   celt_int32_t itmp;

   celt_int16_t stmp;

   ch[4]=0;

   fprintf (file, "RIFF");

   itmp = 0x7fffffff;

   fwrite(&itmp, 4, 1, file);

   fprintf (file, "WAVEfmt ");

   itmp = le_int(16);

   fwrite(&itmp, 4, 1, file);

   stmp = le_short(1);

   fwrite(&stmp, 2, 1, file);

   stmp = le_short(channels);

   fwrite(&stmp, 2, 1, file);

   itmp = le_int(rate);

   fwrite(&itmp, 4, 1, file);

   itmp = le_int(rate*channels*2);

   fwrite(&itmp, 4, 1, file);

   stmp = le_short(2*channels);

   fwrite(&stmp, 2, 1, file);

   stmp = le_short(16);

   fwrite(&stmp, 2, 1, file);

   fprintf (file, "data");

   itmp = le_int(0x7fffffff);

   fwrite(&itmp, 4, 1, file);

}