static void ALSA_Update(void)
{
snd_pcm_playback_status_t status;
int total, count;
if (alsa_pcm_playback_status(pcm_h, &status) >= 0) {
/* Update md_mixfreq if necessary */
if (md_mixfreq != status.rate)
md_mixfreq = status.rate;
/* Using status.count would cause clicks, as this is always less than
the freespace in the buffer - so compute how many bytes we can
afford */
total = status.fragments * status.fragment_size - status.queue;
if (total < fragmentsize)
total = fragmentsize;
} else
total = fragmentsize;
/* Don't send data if ALSA is too busy */
while (total) {
count = fragmentsize > total ? total : fragmentsize;
total -= count;
alsa_pcm_write(pcm_h,audiobuffer,VC_WriteBytes(audiobuffer,count));
}
}
int bx_sound_linux_c::sendwavepacket(int length, Bit8u data[])
{
#if BX_HAVE_ALSASOUND
if (use_alsa_pcm) {
if ((alsa_pcm[0].audio_bufsize+length) <= BX_SOUND_LINUX_BUFSIZE) {
memcpy(audio_buffer[0]+alsa_pcm[0].audio_bufsize, data, length);
alsa_pcm[0].audio_bufsize += length;
} else {
BX_ERROR(("ALSA: audio buffer overflow"));
return BX_SOUNDLOW_ERR;
}
if (alsa_pcm[0].audio_bufsize < alsa_pcm[0].alsa_bufsize) {
return BX_SOUNDLOW_OK;
} else {
return alsa_pcm_write();
}
}
#endif
int ret = write(wave_fd[0], data, length);
if (ret == length) {
return BX_SOUNDLOW_OK;
} else {
BX_ERROR(("OSS: write error"));
return BX_SOUNDLOW_ERR;
}
}
int bx_sound_linux_c::stopwaveplayback()
{
#if BX_HAVE_ALSASOUND
if (use_alsa_pcm && (alsa_pcm[0].audio_bufsize > 0)) {
if (alsa_pcm[0].audio_bufsize < alsa_pcm[0].alsa_bufsize) {
memset(audio_buffer[0]+alsa_pcm[0].audio_bufsize, 0, alsa_pcm[0].alsa_bufsize-alsa_pcm[0].audio_bufsize);
alsa_pcm[0].audio_bufsize = alsa_pcm[0].alsa_bufsize;
}
alsa_pcm_write();
return BX_SOUNDLOW_OK;
}
#endif
// ioctl(wave_fd[0], SNDCTL_DSP_SYNC);
// close(wave_fd[0]);
// wave_fd[0] = -1;
return BX_SOUNDLOW_OK;
}
