/* This is called whenever new data may be written to the stream */
static void stream_write_callback(pa_stream *s, size_t length, void *userdata) {
pa_assert(s);
pa_assert(length > 0);
if (raw) {
pa_assert(!sndfile);
if (stdio_event)
mainloop_api->io_enable(stdio_event, PA_IO_EVENT_INPUT);
if (!buffer)
return;
do_stream_write(length);
} else {
sf_count_t bytes;
void *data;
pa_assert(sndfile);
for (;;) {
size_t data_length = length;
if (pa_stream_begin_write(s, &data, &data_length) < 0) {
pa_log(_("pa_stream_begin_write() failed: %s"), pa_strerror(pa_context_errno(context)));
quit(1);
return;
}
if (readf_function) {
size_t k = pa_frame_size(&sample_spec);
if ((bytes = readf_function(sndfile, data, (sf_count_t) (data_length/k))) > 0)
bytes *= (sf_count_t) k;
} else
bytes = sf_read_raw(sndfile, data, (sf_count_t) data_length);
if (bytes > 0)
pa_stream_write(s, data, (size_t) bytes, NULL, 0, PA_SEEK_RELATIVE);
else
pa_stream_cancel_write(s);
/* EOF? */
if (bytes < (sf_count_t) data_length) {
start_drain();
break;
}
/* Request fulfilled */
if ((size_t) bytes >= length)
break;
length -= bytes;
}
}
}
static void
stream_request_callback(pa_stream * s, size_t nbytes, void * u)
{
cubeb_stream * stm;
void * buffer;
size_t size;
int r;
long got;
size_t towrite;
size_t frame_size;
stm = u;
if (stm->shutdown)
return;
frame_size = pa_frame_size(&stm->sample_spec);
assert(nbytes % frame_size == 0);
towrite = nbytes;
while (towrite) {
size = towrite;
r = pa_stream_begin_write(s, &buffer, &size);
assert(r == 0);
assert(size > 0);
assert(size % frame_size == 0);
got = stm->data_callback(stm, stm->user_ptr, buffer, size / frame_size);
if (got < 0) {
pa_stream_cancel_write(s);
stm->shutdown = 1;
return;
}
r = pa_stream_write(s, buffer, got * frame_size, NULL, 0, PA_SEEK_RELATIVE);
assert(r == 0);
if ((size_t) got < size / frame_size) {
stm->draining = pa_stream_drain(s, stream_drain_success_callback, stm);
stm->shutdown = 1;
return;
}
towrite -= size;
}
assert(towrite == 0);
}
/******************************************************************************
* stream_write_cb()
* This will be called by PulseAudio when we need to provide audio data
* for playback.
*****************************************************************************/
static void stream_write_cb(pa_stream *s, size_t n_requested_bytes,
void *userdata) {
_mbx_out out = (_mbx_out ) userdata;
sample_t *data_to_write = NULL;
size_t n_bytes_written = 0;
assert ( out != NULL && out->stream == s);
if ( out->trigger_shutdown ) {
do_shutdown(out);
return;
}
while ( n_bytes_written < n_requested_bytes ) {
int r;
size_t n_bytes_to_write = n_requested_bytes - n_bytes_written;
r = pa_stream_begin_write(s, (void**)&data_to_write, &n_bytes_to_write);
assert(n_bytes_to_write % (2*sizeof(sample_t)) == 0);
if ( r < 0 ) {
mbx_log_error(MBX_LOG_AUDIO_OUTPUT, "Prepare writing data to the pulseaudio server"
" failed: %s", pa_msg(out));
pa_stream_cancel_write(s);
return;
}
if ( n_bytes_to_write > 0 ) {
int i;
assert ( n_bytes_to_write / sizeof(sample_t) < 44100L*2*8 );
sample_t left[44100L*2*8];
sample_t right[44100L*2*8];
out->cb(left, right, n_bytes_to_write / (2*sizeof(sample_t)), out->output_cb_userdata);
for ( i=0; i<n_bytes_to_write/(2*sizeof(sample_t)); i++ ) {
data_to_write[2*i] = left[i];
data_to_write[2*i+1] = right[i];
}
pa_stream_write(s, data_to_write, n_bytes_to_write, NULL, 0,
PA_SEEK_RELATIVE);
n_bytes_written += n_bytes_to_write;
}
}
}
/*! Starts up audio streaming to the host. */
void HostAudio::open()
{
m_mainloop = pa_threaded_mainloop_new();
if (!m_mainloop) {
qDebug("Could not acquire PulseAudio main loop");
return;
}
m_api = pa_threaded_mainloop_get_api(m_mainloop);
m_context = pa_context_new(m_api, "emumaster");
pa_context_set_state_callback(m_context, contextStreamCallback, this);
if (!m_context) {
qDebug("Could not acquire PulseAudio device context");
return;
}
#if defined(MEEGO_EDITION_HARMATTAN)
if (pa_context_connect(m_context, 0, PA_CONTEXT_NOFLAGS, 0) < 0) {
#elif defined(Q_WS_MAEMO_5)
if (pa_context_connect(m_context, 0, (pa_context_flags_t)0, 0) < 0) {
#endif
int error = pa_context_errno(m_context);
qDebug("Could not connect to PulseAudio server: %s", pa_strerror(error));
return;
}
pa_threaded_mainloop_lock(m_mainloop);
if (pa_threaded_mainloop_start(m_mainloop) < 0) {
qDebug("Could not start mainloop");
return;
}
waitForStreamReady();
pa_sample_spec fmt;
fmt.channels = 2;
fmt.format = PA_SAMPLE_S16LE;
fmt.rate = 44100;
pa_buffer_attr buffer_attributes;
buffer_attributes.tlength = pa_bytes_per_second(&fmt) / 5;
buffer_attributes.maxlength = buffer_attributes.tlength * 3;
buffer_attributes.minreq = buffer_attributes.tlength / 3;
buffer_attributes.prebuf = buffer_attributes.tlength;
m_stream = pa_stream_new(m_context, "emumaster", &fmt, 0);
if (!m_stream) {
int error = pa_context_errno(m_context);
qDebug("Could not acquire new PulseAudio stream: %s", pa_strerror(error));
return;
}
pa_stream_flags_t flags = (pa_stream_flags_t)(PA_STREAM_ADJUST_LATENCY | PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_AUTO_TIMING_UPDATE);
// pa_stream_flags_t flags = (pa_stream_flags_t) (PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_AUTO_TIMING_UPDATE | PA_STREAM_EARLY_REQUESTS);
if (pa_stream_connect_playback(m_stream, 0, &buffer_attributes, flags, 0, 0) < 0) {
m_stream = 0;
int error = pa_context_errno(m_context);
qDebug("Could not connect for playback: %s", pa_strerror(error));
return;
}
waitForStreamReady();
pa_threaded_mainloop_unlock(m_mainloop);
}
/*! Stops audio streaming. */
void HostAudio::close()
{
if (m_mainloop)
pa_threaded_mainloop_stop(m_mainloop);
if (m_stream) {
pa_stream_unref(m_stream);
m_stream = 0;
}
if (m_context) {
pa_context_disconnect(m_context);
pa_context_unref(m_context);
m_context = 0;
}
if (m_mainloop) {
pa_threaded_mainloop_free(m_mainloop);
m_mainloop = 0;
}
}
/*! Streams a frame of audio from emulated system to the host. */
void HostAudio::sendFrame()
{
if (!m_stream)
return;
pa_threaded_mainloop_lock(m_mainloop);
void *data;
#if defined(MEEGO_EDITION_HARMATTAN)
size_t size = -1;
pa_stream_begin_write(m_stream, &data, &size);
#elif defined(Q_WS_MAEMO_5)
size_t size = 4096;
static char buf[4096];
data = buf;
#endif
size = qMin(size, pa_stream_writable_size(m_stream));
if (size)
size = m_emu->fillAudioBuffer(reinterpret_cast<char *>(data), size);
if (size)
pa_stream_write(m_stream, data, size, 0, 0, PA_SEEK_RELATIVE);
#if defined(MEEGO_EDITION_HARMATTAN)
else
pa_stream_cancel_write(m_stream);
#endif
pa_threaded_mainloop_unlock(m_mainloop);
}
/*! \internal */
void HostAudio::waitForStreamReady()
{
pa_context_state_t context_state = pa_context_get_state(m_context);
while (context_state != PA_CONTEXT_READY) {
context_state = pa_context_get_state(m_context);
if (!PA_CONTEXT_IS_GOOD(context_state)) {
int error = pa_context_errno(m_context);
qDebug("Context state is not good: %s", pa_strerror(error));
return;
} else if (context_state == PA_CONTEXT_READY) {
break;
} else {
//qDebug("PulseAudio context state is %d", context_state);
}
pa_threaded_mainloop_wait(m_mainloop);
}
}
