static int outstream_start_pa(SoundIoPrivate *si, SoundIoOutStreamPrivate *os) {
SoundIoOutStream *outstream = &os->pub;
SoundIoPulseAudio *sipa = &si->backend_data.pulseaudio;
SoundIoOutStreamPulseAudio *ospa = &os->backend_data.pulseaudio;
pa_threaded_mainloop_lock(sipa->main_loop);
ospa->write_byte_count = pa_stream_writable_size(ospa->stream);
int frame_count = ospa->write_byte_count / outstream->bytes_per_frame;
outstream->write_callback(outstream, 0, frame_count);
pa_operation *op = pa_stream_cork(ospa->stream, false, nullptr, nullptr);
if (!op) {
pa_threaded_mainloop_unlock(sipa->main_loop);
return SoundIoErrorStreaming;
}
pa_operation_unref(op);
pa_stream_set_write_callback(ospa->stream, playback_stream_write_callback, os);
pa_stream_set_underflow_callback(ospa->stream, playback_stream_underflow_callback, outstream);
pa_stream_set_overflow_callback(ospa->stream, playback_stream_underflow_callback, outstream);
pa_threaded_mainloop_unlock(sipa->main_loop);
return 0;
}
static int outstream_sample_rate_callback(jack_nframes_t nframes, void *arg) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate *)arg;
SoundIoOutStream *outstream = &os->pub;
if (nframes == (jack_nframes_t)outstream->sample_rate) {
return 0;
} else {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return -1;
}
}
static int outstream_buffer_size_callback(jack_nframes_t nframes, void *arg) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate *)arg;
SoundIoOutStreamJack *osj = &os->backend_data.jack;
SoundIoOutStream *outstream = &os->pub;
if ((jack_nframes_t)osj->period_size == nframes) {
return 0;
} else {
outstream->error_callback(outstream, SoundIoErrorStreaming);
return -1;
}
}
static int outstream_process_callback(jack_nframes_t nframes, void *arg) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate *)arg;
SoundIoOutStreamJack *osj = &os->backend_data.jack;
SoundIoOutStream *outstream = &os->pub;
osj->frames_left = nframes;
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
SoundIoOutStreamJackPort *osjp = &osj->ports[ch];
osj->areas[ch].ptr = (char*)jack_port_get_buffer(osjp->source_port, nframes);
osj->areas[ch].step = outstream->bytes_per_sample;
}
outstream->write_callback(outstream, osj->frames_left, osj->frames_left);
return 0;
}
static void playback_stream_state_callback(pa_stream *stream, void *userdata) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate*) userdata;
SoundIoOutStream *outstream = &os->pub;
SoundIo *soundio = outstream->device->soundio;
SoundIoPrivate *si = (SoundIoPrivate *)soundio;
SoundIoPulseAudio *sipa = &si->backend_data.pulseaudio;
SoundIoOutStreamPulseAudio *ospa = &os->backend_data.pulseaudio;
switch (pa_stream_get_state(stream)) {
case PA_STREAM_UNCONNECTED:
case PA_STREAM_CREATING:
case PA_STREAM_TERMINATED:
break;
case PA_STREAM_READY:
ospa->stream_ready = true;
pa_threaded_mainloop_signal(sipa->main_loop, 0);
break;
case PA_STREAM_FAILED:
outstream->error_callback(outstream, SoundIoErrorStreaming);
break;
}
}
static void outstream_shutdown_callback(void *arg) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate *)arg;
SoundIoOutStream *outstream = &os->pub;
outstream->error_callback(outstream, SoundIoErrorStreaming);
}
static int outstream_xrun_callback(void *arg) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate *)arg;
SoundIoOutStream *outstream = &os->pub;
outstream->underflow_callback(outstream);
return 0;
}
static void playback_stream_write_callback(pa_stream *stream, size_t nbytes, void *userdata) {
SoundIoOutStreamPrivate *os = (SoundIoOutStreamPrivate*)(userdata);
SoundIoOutStream *outstream = &os->pub;
int frame_count = nbytes / outstream->bytes_per_frame;
outstream->write_callback(outstream, 0, frame_count);
}
static void playback_stream_underflow_callback(pa_stream *stream, void *userdata) {
SoundIoOutStream *outstream = (SoundIoOutStream*)userdata;
outstream->underflow_callback(outstream);
}