static void spice_gst_decoder_reschedule(VideoDecoder *video_decoder)
{
SpiceGstDecoder *decoder = (SpiceGstDecoder*)video_decoder;
if (decoder->timer_id != 0) {
g_source_remove(decoder->timer_id);
decoder->timer_id = 0;
}
schedule_frame(decoder);
}
/* GStreamer thread
*
* We cannot use GStreamer's signals because they are not always run in
* the main context. So use a callback (lower overhead) and have it pull
* the sample to avoid a race with free_pipeline(). This means queuing the
* decoded frames outside GStreamer. So while we're at it, also schedule
* the frame display ourselves in schedule_frame().
*/
static GstFlowReturn new_sample(GstAppSink *gstappsink, gpointer video_decoder)
{
SpiceGstDecoder *decoder = video_decoder;
GstSample *sample = gst_app_sink_pull_sample(decoder->appsink);
GstBuffer *buffer = sample ? gst_sample_get_buffer(sample) : NULL;
if (sample) {
g_mutex_lock(&decoder->queues_mutex);
/* gst_app_sink_pull_sample() sometimes returns the same buffer twice
* or buffers that have a modified, and thus unrecognizable, PTS.
* Blindly removing frames from the decoding_queue until we find a
* match would only empty the queue, resulting in later buffers not
* finding a match either, etc. So check the buffer has a matching
* frame first.
*/
SpiceGstFrame *gstframe;
GList *l = g_queue_peek_head_link(decoder->decoding_queue);
while (l) {
gstframe = l->data;
if (gstframe->timestamp == GST_BUFFER_PTS(buffer)) {
/* The frame is now ready for display */
gstframe->sample = sample;
g_queue_push_tail(decoder->display_queue, gstframe);
/* Now that we know there is a match, remove it and the older
* frames from the decoding queue.
*/
while ((gstframe = g_queue_pop_head(decoder->decoding_queue))) {
if (gstframe->timestamp == GST_BUFFER_PTS(buffer)) {
break;
}
/* The GStreamer pipeline dropped the corresponding
* buffer.
*/
SPICE_DEBUG("the GStreamer pipeline dropped a frame");
free_gst_frame(gstframe);
}
break;
}
l = l->next;
}
if (!l) {
spice_warning("got an unexpected decoded buffer!");
gst_sample_unref(sample);
}
g_mutex_unlock(&decoder->queues_mutex);
schedule_frame(decoder);
} else {
spice_warning("GStreamer error: could not pull sample");
}
return GST_FLOW_OK;
}
void preroll_video_frames(unsigned int n_frames) {
IDeckLinkMutableVideoFrame *frame;
for (unsigned int i = 0; i < n_frames; i++) {
if (deckLinkOutput->CreateVideoFrame(norms[norm].w,
norms[norm].h, 2*norms[norm].w, bpf,
bmdFrameFlagDefault, &frame) != S_OK) {
throw std::runtime_error("Failed to create frame");
}
schedule_frame(frame);
}
}
/* main context */
static gboolean display_frame(gpointer video_decoder)
{
SpiceGstDecoder *decoder = (SpiceGstDecoder*)video_decoder;
SpiceGstFrame *gstframe;
GstCaps *caps;
gint width, height;
GstStructure *s;
GstBuffer *buffer;
GstMapInfo mapinfo;
g_mutex_lock(&decoder->queues_mutex);
decoder->timer_id = 0;
gstframe = g_queue_pop_head(decoder->display_queue);
g_mutex_unlock(&decoder->queues_mutex);
/* If the queue is empty we don't even need to reschedule */
g_return_val_if_fail(gstframe, G_SOURCE_REMOVE);
if (!gstframe->sample) {
spice_warning("got a frame without a sample!");
goto error;
}
caps = gst_sample_get_caps(gstframe->sample);
if (!caps) {
spice_warning("GStreamer error: could not get the caps of the sample");
goto error;
}
s = gst_caps_get_structure(caps, 0);
if (!gst_structure_get_int(s, "width", &width) ||
!gst_structure_get_int(s, "height", &height)) {
spice_warning("GStreamer error: could not get the size of the frame");
goto error;
}
buffer = gst_sample_get_buffer(gstframe->sample);
if (!gst_buffer_map(buffer, &mapinfo, GST_MAP_READ)) {
spice_warning("GStreamer error: could not map the buffer");
goto error;
}
stream_display_frame(decoder->base.stream, gstframe->frame,
width, height, mapinfo.data);
gst_buffer_unmap(buffer, &mapinfo);
error:
free_gst_frame(gstframe);
schedule_frame(decoder);
return G_SOURCE_REMOVE;
}
/* DeckLink callbacks */
virtual HRESULT ScheduledFrameCompleted(IDeckLinkVideoFrame *frame,
BMDOutputFrameCompletionResult result) {
switch (result) {
case bmdOutputFrameDisplayedLate:
fprintf(stderr, "WARNING: Decklink displayed frame late (running too slow!)\r\n");
break;
case bmdOutputFrameDropped:
fprintf(stderr, "WARNING: Decklink dropped frame\r\n");
break;
case bmdOutputFrameFlushed:
fprintf(stderr, "WARNING: Decklink flushed frame\r\n");
break;
default:
break;
}
schedule_frame((IDeckLinkMutableVideoFrame *) frame);
return S_OK;
}
void preroll_video_frames(unsigned int n_frames) {
IDeckLinkMutableVideoFrame *frame;
IDeckLinkVideoFrameAncillary *anc;
for (unsigned int i = 0; i < n_frames; i++) {
if (deckLinkOutput->CreateVideoFrame(norms[norm].w,
norms[norm].h, 2*norms[norm].w, bpf,
bmdFrameFlagDefault, &frame) != S_OK) {
throw std::runtime_error("Failed to create frame");
}
if (deckLinkOutput->CreateAncillaryData(bpf, &anc) != S_OK) {
throw std::runtime_error("failed to set frame ancillary data");
}
if (frame->SetAncillaryData(anc) != S_OK) {
throw std::runtime_error("failed to set frame ancillary data");
}
schedule_frame(frame);
}
}
int main(void) {
int input, output;
create_sockets(&input, &output);
bind_sockets("wlan0", input, "lo", output);
/* main program part.. */
frame_t work;
struct pollfd pollinput;
pollinput.fd = input;
pollinput.events = POLLIN;
int mswait;
while ( 1 ) {
printf("%40d frames in buffer.\r", count_frames());
work.length = read(input, work.data.buffer, BIGGEST_FRAME);
if ( work.length > 0 ) {
translate_frame(&work);
schedule_frame(&work);
queue_frame(&work);
// freaking woo hoo
}
dole_frame(output);
mswait = ttn_frame();
poll(&pollinput, 1, mswait);
}
return 0;
}
