ref: 25649c1569c3980cc9252f4ac57eb20d8e6792be
dir: /tools/wav_io.c/
/* 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<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; 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]; 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); }