static int
oss_open(struct voss_backend *pbe, const char *devname, int samplerate,
int bufsize, int *pchannels, int *pformat, int attr, int fionbio)
{
int temp;
int err;
pbe->fd = open(devname, attr);
if (pbe->fd < 0) {
warn("Could not open DSP device '%s'", devname);
return (-1);
}
err = ioctl(pbe->fd, FIONBIO, &fionbio);
if (err < 0) {
warn("Could not set blocking mode on DSP");
goto error;
}
err = oss_set_format(pbe->fd, pformat);
if (err < 0) {
warn("Could not set sample format 0x%08x", *pformat);
goto error;
}
temp = *pchannels;
bufsize /= temp; /* get buffer size per channel */
do {
err = ioctl(pbe->fd, SOUND_PCM_WRITE_CHANNELS, &temp);
} while (err < 0 && --temp > 0);
err = ioctl(pbe->fd, SOUND_PCM_READ_CHANNELS, &temp);
if (err < 0 || temp <= 0 || temp > *pchannels) {
warn("Could not set DSP channels: %d / %d", temp, *pchannels);
goto error;
}
*pchannels = temp;
temp = samplerate;
err = ioctl(pbe->fd, SNDCTL_DSP_SPEED, &temp);
if (err < 0 || temp != samplerate) {
warn("Could not set sample rate to %d / %d Hz", temp, samplerate);
goto error;
}
temp = bufsize * (*pchannels);
err = ioctl(pbe->fd, SNDCTL_DSP_SETBLKSIZE, &temp);
if (err < 0) {
warn("Could not set block size to %d", temp);
goto error;
}
return (0);
error:
close(pbe->fd);
pbe->fd = -1;
return (-1);
}
static void
oss_restore_format()
{
RD_WAVEFORMATEX wfx;
memset(&wfx, 0, sizeof(RD_WAVEFORMATEX));
switch (format)
{
case AFMT_U8:
wfx.wBitsPerSample = 8;
break;
case AFMT_S16_LE:
wfx.wBitsPerSample = 16;
break;
default:
wfx.wBitsPerSample = 0;
}
wfx.nChannels = stereo ? 2 : 1;
wfx.nSamplesPerSec = snd_rate;
oss_set_format(&wfx);
}
