/* 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 "speex/speex_types.h"static spx_uint32_t le_int(spx_uint32_t i){   spx_uint32_t ret=i;#ifdef WORDS_BIGENDIAN   ret =  i>>24;   ret += (i>>8)&0x0000ff00;   ret += (i<<8)&0x00ff0000;   ret += (i<<24);#endif   return ret;}unsigned short be_short(unsigned short s){   unsigned short ret=s;#ifndef WORDS_BIGENDIAN   ret =  s>>8;   ret += s<<8;#endif   return ret;}unsigned short le_short(unsigned short s){   unsigned short ret=s;#ifdef WORDS_BIGENDIAN   ret =  s>>8;   ret += s<<8;#endif   return ret;}int read_wav_header(FILE *file, int *rate, int *channels, int *format, int *size){   char ch[5];   int itmp;   short stmp;   int bpersec;   short 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<itmp;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;   if (*rate != 8000 && *rate != 16000 && *rate != 11025 && *rate != 22050 && *rate != 32000 && *rate != 44100 && *rate != 48000)   {      fprintf (stderr, "Only 8 kHz (narrowband) and 16 kHz (wideband) supported (plus 11.025 kHz and 22.05 kHz, but your mileage may vary)\n");      return -1;   }   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<skip_bytes;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<itmp;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];   int itmp;   short 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);}