ref: 09724420d86f17e95ab10cc06750bcd8dd9a1dc9
dir: /src/oss.c/
/*
* Copyright 1997 Chris Bagwell And Sundry Contributors
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Chris Bagwell And Sundry Contributors are not
* responsible for the consequences of using this software.
*
* Direct to Open Sound System (OSS) sound driver
* OSS is a popular unix sound driver for Intel x86 unices (eg. Linux)
* and several other unixes (such as SunOS/Solaris).
* This driver is compatible with OSS original source that was called
* USS, Voxware and TASD.
*
* added by Chris Bagwell (cbagwell@sprynet.com) on 2/19/96
* based on info grabed from vplay.c in Voxware snd-utils-3.5 package.
* and on LINUX_PLAYER patches added by Greg Lee
* which was originally from Directo to Sound Blaster device driver (sbdsp.c).
* SBLAST patches by John T. Kohl.
*
* Changes:
*
* Nov. 26, 1999 Stan Brooks <stabro@megsinet.net>
* Moved initialization code common to startread and startwrite
* into a single function ossdspinit().
*
*/
#include "st_i.h"
#if defined(HAVE_OSS)
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#ifdef HAVE_SYS_SOUNDCARD_H
#include <sys/soundcard.h>
#endif
#ifdef HAVE_MACHINE_SOUNDCARD_H
#include <machine/soundcard.h>
#endif
#include <sys/ioctl.h>
/* common r/w initialization code */
static int ossdspinit(ft_t ft)
{
int sampletype, samplesize, dsp_stereo;
int tmp, rc;
if (ft->info.rate == 0.0) ft->info.rate = 8000;
if (ft->info.size == -1) ft->info.size = ST_SIZE_BYTE;
if (ft->info.size == ST_SIZE_BYTE) {
sampletype = AFMT_U8;
samplesize = 8;
if (ft->info.encoding == -1)
ft->info.encoding = ST_ENCODING_UNSIGNED;
if (ft->info.encoding != ST_ENCODING_UNSIGNED) {
st_report("OSS driver only supports unsigned with bytes");
st_report("Forcing to unsigned");
ft->info.encoding = ST_ENCODING_UNSIGNED;
}
}
else if (ft->info.size == ST_SIZE_WORD) {
sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_BE : AFMT_S16_LE;
samplesize = 16;
if (ft->info.encoding == -1)
ft->info.encoding = ST_ENCODING_SIGN2;
if (ft->info.encoding != ST_ENCODING_SIGN2) {
st_report("OSS driver only supports signed with words");
st_report("Forcing to signed linear");
ft->info.encoding = ST_ENCODING_SIGN2;
}
}
else {
sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_BE : AFMT_S16_LE;
samplesize = 16;
ft->info.size = ST_SIZE_WORD;
ft->info.encoding = ST_ENCODING_SIGN2;
st_report("OSS driver only supports bytes and words");
st_report("Forcing to signed linear word");
}
if (ft->info.channels == -1) ft->info.channels = 1;
else if (ft->info.channels > 2) ft->info.channels = 2;
if (ioctl(fileno(ft->fp), SNDCTL_DSP_RESET, 0) < 0)
{
st_fail_errno(ft,ST_EOF,"Unable to reset OSS driver. Possibly accessing an invalid file/device");
return(ST_EOF);
}
/* Query the supported formats and find the best match
*/
rc = ioctl(fileno(ft->fp), SNDCTL_DSP_GETFMTS, &tmp);
if (rc == 0) {
if ((tmp & sampletype) == 0)
{
/* is 16-bit supported? */
if (samplesize == 16 && (tmp & (AFMT_S16_LE|AFMT_S16_BE)) == 0)
{
/* Must not like 16-bits, try 8-bits */
ft->info.size = ST_SIZE_BYTE;
ft->info.encoding = ST_ENCODING_UNSIGNED;
st_report("OSS driver doesn't like signed words");
st_report("Forcing to unsigned bytes");
tmp = sampletype = AFMT_U8;
samplesize = 8;
}
/* is 8-bit supported */
else if (samplesize == 8 && (tmp & AFMT_U8) == 0)
{
ft->info.size = ST_SIZE_WORD;
ft->info.encoding = ST_ENCODING_SIGN2;
st_report("OSS driver doesn't like unsigned bytes");
st_report("Forcing to signed words");
sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_BE : AFMT_S16_LE;
samplesize = 16;
}
/* determine which 16-bit format to use */
if (samplesize == 16)
{
if ((tmp & sampletype) == 0)
{
sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_LE : AFMT_S16_BE;
ft->swap = ft->swap ? 0 : 1;
}
}
}
tmp = sampletype;
rc = ioctl(fileno(ft->fp), SNDCTL_DSP_SETFMT, &tmp);
}
/* Give up and exit */
if (rc < 0 || tmp != sampletype)
{
st_fail_errno(ft,ST_EOF,"Unable to set the sample size to %d", samplesize);
return (ST_EOF);
}
if (ft->info.channels == 2) dsp_stereo = 1;
else dsp_stereo = 0;
tmp = dsp_stereo;
if (ioctl(fileno(ft->fp), SNDCTL_DSP_STEREO, &tmp) < 0)
{
st_warn("Couldn't set to %s", dsp_stereo? "stereo":"mono");
dsp_stereo = 0;
}
if (tmp != dsp_stereo)
{
st_warn("Sound card appears to only support %d channels. Overriding format\n", tmp+1);
ft->info.channels = tmp + 1;
}
tmp = ft->info.rate;
if (ioctl (fileno(ft->fp), SNDCTL_DSP_SPEED, &tmp) < 0 ||
(int)ft->info.rate != tmp) {
/* If the rate the sound card is using is not within 1% of what
* the user specified then override the user setting.
* The only reason not to always override this is because of
* clock-rounding problems. Sound cards will sometimes use
* things like 44101 when you ask for 44100. No need overriding
* this and having strange output file rates for something that
* we can't hear anyways.
*/
if ((int)ft->info.rate - tmp > (tmp * .01) ||
tmp - (int)ft->info.rate > (tmp * .01)) {
st_warn("Unable to set audio speed to %d (set to %d)",
ft->info.rate, tmp);
ft->info.rate = tmp;
}
}
/* Find out block size to use last because the driver could compute
* its size based on specific rates/formats.
*/
ft->file.size = 0;
ioctl (fileno(ft->fp), SNDCTL_DSP_GETBLKSIZE, &ft->file.size);
if (ft->file.size < 4 || ft->file.size > 65536) {
st_fail_errno(ft,ST_EOF,"Invalid audio buffer size %d", ft->file.size);
return (ST_EOF);
}
ft->file.count = 0;
ft->file.pos = 0;
ft->file.eof = 0;
if ((ft->file.buf = (char *)malloc(ft->file.size)) == NULL) {
st_fail_errno(ft,ST_EOF,"Unable to allocate input/output buffer of size %d", ft->file.size);
return (ST_EOF);
}
if (ioctl(fileno(ft->fp), SNDCTL_DSP_SYNC, NULL) < 0) {
st_fail_errno(ft,ST_EOF,"Unable to sync dsp");
return (ST_EOF);
}
/* Change to non-buffered I/O */
setvbuf(ft->fp, NULL, _IONBF, sizeof(char) * ft->file.size);
return(ST_SUCCESS);
}
/*
* Do anything required before you start reading samples.
* Read file header.
* Find out sampling rate,
* size and encoding of samples,
* mono/stereo/quad.
*/
int st_ossdspstartread(ft_t ft)
{
int rc;
rc = ossdspinit(ft);
sigintreg(ft); /* Prepare to catch SIGINT */
return rc;
}
int st_ossdspstartwrite(ft_t ft)
{
return ossdspinit(ft);
}
#endif