void AudioDriverBB10::thread_func(void* p_udata) {
AudioDriverBB10* ad = (AudioDriverBB10*)p_udata;
int channels = (ad->output_format == OUTPUT_MONO ? 1 : 2);
int frame_count = ad->sample_buf_count / channels;
int bytes_out = frame_count * channels * 2;
while (!ad->exit_thread) {
if (!ad->active) {
for (int i=0; i < ad->sample_buf_count; i++) {
ad->samples_out[i] = 0;
};
} else {
ad->lock();
ad->audio_server_process(frame_count, ad->samples_in);
ad->unlock();
for(int i=0;i<frame_count*channels;i++) {
ad->samples_out[i]=ad->samples_in[i]>>16;
}
};
int todo = bytes_out;
int total = 0;
while (todo) {
uint8_t* src = (uint8_t*)ad->samples_out;
int wrote = snd_pcm_plugin_write(ad->pcm_handle, (void*)(src + total), todo);
if (wrote < 0) {
// error?
break;
};
total += wrote;
todo -= wrote;
if (wrote < todo) {
if (ad->thread_exited) {
break;
};
printf("pcm_write underrun %i, errno %i\n", (int)ad->thread_exited, errno);
snd_pcm_channel_status_t status;
zeromem(&status, sizeof(status));
// put in non-blocking mode
snd_pcm_nonblock_mode(ad->pcm_handle, 1);
status.channel = SND_PCM_CHANNEL_PLAYBACK;
int ret = snd_pcm_plugin_status(ad->pcm_handle, &status);
//printf("status return %i, %i, %i, %i, %i\n", ret, errno, status.status, SND_PCM_STATUS_READY, SND_PCM_STATUS_UNDERRUN);
snd_pcm_nonblock_mode(ad->pcm_handle, 0);
if (ret < 0) {
break;
};
if (status.status == SND_PCM_STATUS_READY ||
status.status == SND_PCM_STATUS_UNDERRUN) {
snd_pcm_plugin_prepare(ad->pcm_handle, SND_PCM_CHANNEL_PLAYBACK);
} else {
break;
};
};
};
};
snd_pcm_plugin_flush (ad->pcm_handle, SND_PCM_CHANNEL_PLAYBACK);
ad->thread_exited=true;
printf("**************** audio thread exit\n");
};
static void flush_capture(struct bb10_stream *stream)
{
if (stream != NULL && stream->ca_pcm != NULL) {
snd_pcm_plugin_flush (stream->ca_pcm, SND_PCM_CHANNEL_CAPTURE);
}
}
static void flush()
{
snd_pcm_plugin_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK);
prepare_driver();
}
static void flush_play(struct bb10_stream *stream)
{
if (stream != NULL && stream->pb_pcm != NULL) {
snd_pcm_plugin_flush (stream->pb_pcm, SND_PCM_CHANNEL_PLAYBACK);
}
}
