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decklinkvideosrc: Notify about signal loss even when dropping no-signal frames

Browse source 
Otherwise the application has no way of knowing that signal loss
happened other than noticing a gap between actual frames.
This commit is contained in:
Sebastian Dröge 2019-06-20 10:04:06 +03:00
parent dcff70d6bf
commit 5e4d10e296
1 changed files with 45 additions and 26 deletions
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71
sys/decklink/gstdecklinkvideosrc.cpp
View file

@ -190,7 +190,8 @@ typedef struct
static void
capture_frame_clear (CaptureFrame * frame)
{
frame->frame->Release ();
if (frame->frame)
frame->frame->Release ();
if (frame->tc)
gst_video_time_code_free (frame->tc);
memset (frame, 0, sizeof (*frame));
@ -823,9 +824,6 @@ gst_decklink_video_src_got_frame (GstElement * element,
GST_TIME_FORMAT "), no signal: %d", GST_TIME_ARGS (capture_time),
GST_TIME_ARGS (stream_time), GST_TIME_ARGS (stream_duration), no_signal);
if (self->drop_no_signal_frames && no_signal)
return;
g_mutex_lock (&self->lock);
if (self->first_time == GST_CLOCK_TIME_NONE)
self->first_time = stream_time;
@ -840,6 +838,18 @@ gst_decklink_video_src_got_frame (GstElement * element,
return;
}
if (self->drop_no_signal_frames && no_signal) {
CaptureFrame f;
memset (&f, 0, sizeof (f));
/* Notify the streaming thread about the signal loss */
gst_queue_array_push_tail_struct (self->current_frames, &f);
g_cond_signal (&self->cond);
g_mutex_unlock (&self->lock);
return;
}
gst_decklink_video_src_update_time_mapping (self, capture_time, stream_time);
if (self->output_stream_time) {
timestamp = stream_time;
@ -871,10 +881,12 @@ gst_decklink_video_src_got_frame (GstElement * element,
self->buffer_size) {
CaptureFrame *tmp = (CaptureFrame *)
gst_queue_array_pop_head_struct (self->current_frames);
if (skipped_frames == 0)
from_timestamp = tmp->timestamp;
skipped_frames++;
to_timestamp = tmp->timestamp;
if (tmp->frame) {
if (skipped_frames == 0)
from_timestamp = tmp->timestamp;
skipped_frames++;
to_timestamp = tmp->timestamp;
}
capture_frame_clear (tmp);
}
@ -1198,6 +1210,7 @@ gst_decklink_video_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
GST_STATIC_CAPS ("timestamp/x-decklink-hardware");
g_mutex_lock (&self->lock);
retry:
while (gst_queue_array_is_empty (self->current_frames) && !self->flushing) {
g_cond_wait (&self->cond, &self->lock);
}
@ -1209,11 +1222,33 @@ gst_decklink_video_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
}
f = *(CaptureFrame *) gst_queue_array_pop_head_struct (self->current_frames);
g_mutex_unlock (&self->lock);
// We will have no frame if frames without signal are dropped immediately
// but we still have to signal that it's lost here.
if (f.no_signal || !f.frame) {
if (!self->no_signal) {
self->no_signal = TRUE;
g_object_notify (G_OBJECT (self), "signal");
GST_ELEMENT_WARNING (GST_ELEMENT (self), RESOURCE, READ, ("No signal"),
("No input source was detected - video frames invalid"));
}
// If we have no frame here, simply retry until we got one
if (!f.frame) {
capture_frame_clear (&f);
goto retry;
}
} else {
if (self->no_signal) {
self->no_signal = FALSE;
g_object_notify (G_OBJECT (self), "signal");
GST_ELEMENT_INFO (GST_ELEMENT (self), RESOURCE, READ, ("Signal found"),
("Input source detected"));
}
}
// If we're not flushing, we should have a valid frame from the queue
g_assert (f.frame != NULL);
g_mutex_lock (&self->lock);
if (self->caps_mode != f.mode) {
if (self->mode == GST_DECKLINK_MODE_AUTO) {
GST_DEBUG_OBJECT (self, "Mode changed from %d to %d", self->caps_mode,
@ -1304,22 +1339,6 @@ gst_decklink_video_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
vf->input = self->input->input;
vf->input->AddRef ();
if (f.no_signal) {
if (!self->no_signal) {
self->no_signal = TRUE;
g_object_notify (G_OBJECT (self), "signal");
GST_ELEMENT_WARNING (GST_ELEMENT (self), RESOURCE, READ, ("No signal"),
("No input source was detected - video frames invalid"));
}
} else {
if (self->no_signal) {
self->no_signal = FALSE;
g_object_notify (G_OBJECT (self), "signal");
GST_ELEMENT_INFO (GST_ELEMENT (self), RESOURCE, READ, ("Signal found"),
("Input source detected"));
}
}
mode = gst_decklink_get_mode (self->mode);
// If we have a format that supports VANC and we are asked to extract CC,