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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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52
FrameGrabber.cpp
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@@ -271,8 +271,8 @@ void FrameGrabbing::grabFrame(FrameBuffer *frame_buffer)
FrameGrabber::FrameGrabber(): finished_(false), active_(false), endofstream_(false), accept_buffer_(false), buffering_full_(false),
pipeline_(nullptr), src_(nullptr), caps_(nullptr), timer_(nullptr),
FrameGrabber::FrameGrabber(): finished_(false), initialized_(false), active_(false), endofstream_(false), accept_buffer_(false), buffering_full_(false),
pipeline_(nullptr), src_(nullptr), caps_(nullptr), timer_(nullptr), timer_firstframe_(0),
timestamp_(0), duration_(0), frame_count_(0), buffering_size_(MIN_BUFFER_SIZE), timestamp_on_clock_(false)
{
// unique id
@@ -315,6 +315,8 @@ uint64_t FrameGrabber::duration() const
void FrameGrabber::stop ()
{
// TODO if not initialized wait for initializer
// stop recording
active_ = false;
@@ -324,6 +326,8 @@ void FrameGrabber::stop ()
std::string FrameGrabber::info() const
{
if (!initialized_)
return "Initializing";
if (active_)
return GstToolkit::time_to_string(duration_);
else
@@ -363,6 +367,12 @@ GstPadProbeReturn FrameGrabber::callback_event_probe(GstPad *, GstPadProbeInfo *
return GST_PAD_PROBE_OK;
}
std::string FrameGrabber::initialize(FrameGrabber *rec, GstCaps *caps)
{
return rec->init(caps);
}
void FrameGrabber::addFrame (GstBuffer *buffer, GstCaps *caps)
{
// ignore
@@ -371,15 +381,37 @@ void FrameGrabber::addFrame (GstBuffer *buffer, GstCaps *caps)
// first time initialization
if (pipeline_ == nullptr) {
// type specific initialisation
init(caps);
// attach EOS detector
GstPad *pad = gst_element_get_static_pad (gst_bin_get_by_name (GST_BIN (pipeline_), "sink"), "sink");
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM, FrameGrabber::callback_event_probe, this, NULL);
gst_object_unref (pad);
initializer_ = std::async( FrameGrabber::initialize, this, caps);
}
// stop if an incompatilble frame buffer given
else if ( !gst_caps_is_subset( caps_, caps ))
// initializer ongoing in separate thread
if (initializer_.valid()) {
// try to get info from initializer
if (initializer_.wait_for( std::chrono::milliseconds(4) ) == std::future_status::ready )
{
// done initialization
std::string msg = initializer_.get();
// if initialization succeeded
if (initialized_) {
// attach EOS detector
GstPad *pad = gst_element_get_static_pad (gst_bin_get_by_name (GST_BIN (pipeline_), "sink"), "sink");
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM, FrameGrabber::callback_event_probe, this, NULL);
gst_object_unref (pad);
// start recording
active_ = true;
// inform
Log::Info("%s", msg.c_str());
}
// else show warning
else {
Log::Warning("%s", msg.c_str());
}
}
}
// stop if an incompatilble frame buffer given after initialization
if (initialized_ && !gst_caps_is_subset( caps_, caps ))
{
stop();
Log::Warning("Frame capture interrupted because the resolution changed.");