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Integrated preliminary implementation of Device class with monitoring of

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v4l2 device connected to the machine using GstDeviceMonitor.
This commit is contained in:
brunoherbelin
2020-09-23 23:29:45 +02:00
parent 9e160fec51
commit 84caf2da9a
6 changed files with 233 additions and 72 deletions
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70
Stream.cpp
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@@ -128,48 +128,44 @@ void Stream::execute_open()
// setup appsink
GstElement *sink = gst_bin_get_by_name (GST_BIN (pipeline_), "sink");
if (sink) {
// // instruct the sink to send samples synched in time
// gst_base_sink_set_sync (GST_BASE_SINK(sink), false);
// instruct sink to use the required caps
gst_app_sink_set_caps (GST_APP_SINK(sink), caps);
// Instruct appsink to drop old buffers when the maximum amount of queued buffers is reached.
gst_app_sink_set_max_buffers( GST_APP_SINK(sink), 50);
gst_app_sink_set_drop (GST_APP_SINK(sink), true);
#ifdef USE_GST_APPSINK_CALLBACKS_
// set the callbacks
GstAppSinkCallbacks callbacks;
if (single_frame_) {
callbacks.new_preroll = callback_new_preroll;
callbacks.eos = NULL;
callbacks.new_sample = NULL;
}
else {
callbacks.new_preroll = callback_new_preroll;
callbacks.eos = callback_end_of_stream;
callbacks.new_sample = callback_new_sample;
}
gst_app_sink_set_callbacks (GST_APP_SINK(sink), &callbacks, this, NULL);
gst_app_sink_set_emit_signals (GST_APP_SINK(sink), false);
#else
// connect signals callbacks
g_signal_connect(G_OBJECT(sink), "new-preroll", G_CALLBACK (callback_new_preroll), this);
if (!single_frame_) {
g_signal_connect(G_OBJECT(sink), "new-sample", G_CALLBACK (callback_new_sample), this);
g_signal_connect(G_OBJECT(sink), "eos", G_CALLBACK (callback_end_of_stream), this);
}
gst_app_sink_set_emit_signals (GST_APP_SINK(sink), true);
#endif
}
else {
if (!sink) {
Log::Warning("Stream %d Could not configure sink", id_);
failed_ = true;
return;
}
// instruct sink to use the required caps
gst_app_sink_set_caps (GST_APP_SINK(sink), caps);
// Instruct appsink to drop old buffers when the maximum amount of queued buffers is reached.
gst_app_sink_set_max_buffers( GST_APP_SINK(sink), 50);
gst_app_sink_set_drop (GST_APP_SINK(sink), true);
#ifdef USE_GST_APPSINK_CALLBACKS_
// set the callbacks
GstAppSinkCallbacks callbacks;
if (single_frame_) {
callbacks.new_preroll = callback_new_preroll;
callbacks.eos = NULL;
callbacks.new_sample = NULL;
}
else {
callbacks.new_preroll = callback_new_preroll;
callbacks.eos = callback_end_of_stream;
callbacks.new_sample = callback_new_sample;
}
gst_app_sink_set_callbacks (GST_APP_SINK(sink), &callbacks, this, NULL);
gst_app_sink_set_emit_signals (GST_APP_SINK(sink), false);
#else
// connect signals callbacks
g_signal_connect(G_OBJECT(sink), "new-preroll", G_CALLBACK (callback_new_preroll), this);
if (!single_frame_) {
g_signal_connect(G_OBJECT(sink), "new-sample", G_CALLBACK (callback_new_sample), this);
g_signal_connect(G_OBJECT(sink), "eos", G_CALLBACK (callback_end_of_stream), this);
}
gst_app_sink_set_emit_signals (GST_APP_SINK(sink), true);
#endif
// set to desired state (PLAY or PAUSE)
GstStateChangeReturn ret = gst_element_set_state (pipeline_, desired_state_);
if (ret == GST_STATE_CHANGE_FAILURE) {