NetBSD/usr.bin/audio/common/wav.c

201 lines
5.0 KiB
C

/* $NetBSD: wav.c,v 1.7 2004/01/21 11:55:07 mrg Exp $ */
/*
* Copyright (c) 2002 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* WAV support for the audio tools; thanks go to the sox utility for
* clearing up issues with WAV files.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: wav.c,v 1.7 2004/01/21 11:55:07 mrg Exp $");
#endif
#include <sys/types.h>
#include <sys/audioio.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libaudio.h"
struct {
int wenc;
const char *wname;
} wavencs[] = {
{ WAVE_FORMAT_UNKNOWN, "Microsoft Official Unknown" },
{ WAVE_FORMAT_PCM, "Microsoft PCM" },
{ WAVE_FORMAT_ADPCM, "Microsoft ADPCM" },
{ WAVE_FORMAT_ALAW, "Microsoft A-law" },
{ WAVE_FORMAT_MULAW, "Microsoft mu-law" },
{ WAVE_FORMAT_OKI_ADPCM,"OKI ADPCM" },
{ WAVE_FORMAT_DIGISTD, "Digistd format" },
{ WAVE_FORMAT_DIGIFIX, "Digifix format" },
{ -1, "?Unknown?" },
};
const char *
wav_enc_from_val(int encoding)
{
int i;
for (i = 0; wavencs[i].wenc != -1; i++)
if (wavencs[i].wenc == encoding)
break;
return (wavencs[i].wname);
}
/*
* sample header is:
*
* RIFF\^@^C^@WAVEfmt ^P^@^@^@^A^@^B^@D<AC>^@^@^P<B1>^B^@^D^@^P^@data^@^@^C^@^@^@^@^@^@^@^@^@^@
*
*/
/*
* WAV format helpers
*/
/*
* find a .wav header, etc. returns header length on success
*/
ssize_t
audio_wav_parse_hdr(hdr, sz, enc, prec, sample, channels, datasize)
void *hdr;
size_t sz;
u_int *enc;
u_int *prec;
u_int *sample;
u_int *channels;
size_t *datasize;
{
char *where = hdr, *owhere;
wav_audioheaderpart part;
wav_audioheaderfmt fmt;
char *end = (((char *)hdr) + sz);
u_int newenc, newprec;
static const char
strfmt[4] = "fmt ",
strRIFF[4] = "RIFF",
strWAVE[4] = "WAVE",
strdata[4] = "data";
if (sz < 32)
return (AUDIO_ENOENT);
if (strncmp(where, strRIFF, sizeof strRIFF))
return (AUDIO_ENOENT);
where += 8;
if (strncmp(where, strWAVE, sizeof strWAVE))
return (AUDIO_ENOENT);
where += 4;
do {
memcpy(&part, where, sizeof part);
owhere = where;
where += getle32(part.len) + 8;
} while (where < end && strncmp(part.name, strfmt, sizeof strfmt));
/* too short ? */
if (where + sizeof fmt > end)
return (AUDIO_ESHORTHDR);
memcpy(&fmt, (owhere + 8), sizeof fmt);
switch (getle16(fmt.tag)) {
case WAVE_FORMAT_UNKNOWN:
case WAVE_FORMAT_ADPCM:
case WAVE_FORMAT_OKI_ADPCM:
case WAVE_FORMAT_DIGISTD:
case WAVE_FORMAT_DIGIFIX:
case IBM_FORMAT_MULAW:
case IBM_FORMAT_ALAW:
case IBM_FORMAT_ADPCM:
default:
return (AUDIO_EWAVUNSUPP);
case WAVE_FORMAT_PCM:
switch (getle16(fmt.bits_per_sample)) {
case 8:
newprec = 8;
break;
case 16:
newprec = 16;
break;
case 24:
newprec = 24;
break;
case 32:
newprec = 32;
break;
default:
return (AUDIO_EWAVBADPCM);
}
if (newprec == 8)
newenc = AUDIO_ENCODING_ULINEAR_LE;
else
newenc = AUDIO_ENCODING_SLINEAR_LE;
break;
case WAVE_FORMAT_ALAW:
newenc = AUDIO_ENCODING_ALAW;
newprec = 8;
break;
case WAVE_FORMAT_MULAW:
newenc = AUDIO_ENCODING_ULAW;
newprec = 8;
break;
}
do {
memcpy(&part, where, sizeof part);
owhere = where;
where += (getle32(part.len) + 8);
} while (where < end && strncmp(part.name, strdata, sizeof strdata));
if ((where - getle32(part.len)) <= end) {
if (channels)
*channels = (u_int)getle16(fmt.channels);
if (sample)
*sample = getle32(fmt.sample_rate);
if (enc)
*enc = newenc;
if (prec)
*prec = newprec;
if (datasize)
*datasize = (size_t)getle32(part.len);
return (owhere - (char *)hdr + 8);
}
return (AUDIO_EWAVNODATA);
}