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Frame grabber threaded initialization

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Start gstreamer init of frame grabber in a thread and wait future return from initializer before switching to active recording mode.
This commit is contained in:
Bruno Herbelin
2021-12-02 11:45:22 +01:00
parent b97fd06f2a
commit 68b2c5e0c1
8 changed files with 100 additions and 79 deletions
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27
Loopback.cpp
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@@ -171,16 +171,15 @@ Loopback::Loopback() : FrameGrabber()
frame_duration_ = gst_util_uint64_scale_int (1, GST_SECOND, 30); // fixed 30 FPS
}
void Loopback::init(GstCaps *caps)
std::string Loopback::init(GstCaps *caps)
{
// ignore
if (caps == nullptr)
return;
return std::string("Invalid caps");
if (!Loopback::systemLoopbackInitialized()){
Log::Warning("Loopback system shall be initialized first.");
finished_ = true;
return;
return std::string("Loopback system shall be initialized first.");
}
// create a gstreamer pipeline
@@ -190,10 +189,10 @@ void Loopback::init(GstCaps *caps)
GError *error = NULL;
pipeline_ = gst_parse_launch (description.c_str(), &error);
if (error != NULL) {
Log::Warning("Loopback Could not construct pipeline %s:\n%s", description.c_str(), error->message);
std::string msg = std::string("Loopback : Could not construct pipeline ") + description + "\n" + std::string(error->message);
g_clear_error (&error);
finished_ = true;
return;
return msg;
}
// setup device sink
@@ -238,27 +237,21 @@ void Loopback::init(GstCaps *caps)
}
else {
Log::Warning("Loopback Could not configure source");
finished_ = true;
return;
return std::string("Loopback : Could not configure source.");
}
// start recording
GstStateChangeReturn ret = gst_element_set_state (pipeline_, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
Log::Warning("Loopback Could not open %s", Loopback::system_loopback_name.c_str());
finished_ = true;
return;
return std::string("Loopback : Could not open ") + Loopback::system_loopback_name;
}
// all good
#if defined(LINUX)
Log::Notify("Loopback started (v4l2loopback on %s)", Loopback::system_loopback_name.c_str());
#else
Log::Notify("Loopback started (%s)", Loopback::system_loopback_name.c_str());
#endif
// start
active_ = true;
initialized_ = true;
return std::string("Loopback started on ") + Loopback::system_loopback_name;
}
void Loopback::terminate()