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Added Stream Discoverer to detect frame size from a gstreamer pipeline

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Previous use of Stream are not affected (the discoverer is passively returning the given width and height). But if the Stream is created without dimensions, it will run a discoverer to try to get preroll frames and detect width and height from there.
This commit is contained in:
Bruno Herbelin
2021-12-30 00:15:43 +01:00
parent bc540044ac
commit 033d41863a
5 changed files with 153 additions and 19 deletions
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18
MediaPlayer.cpp
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@@ -282,8 +282,8 @@ void MediaPlayer::reopen()
}
}
void MediaPlayer::execute_open()
{
void MediaPlayer::execute_open()
{
// Create gstreamer pipeline :
// "uridecodebin uri=file:///path_to_file/filename.mp4 ! videoconvert ! appsink "
// equivalent to command line
@@ -341,7 +341,7 @@ void MediaPlayer::execute_open()
g_object_set(G_OBJECT(pipeline_), "name", std::to_string(id_).c_str(), NULL);
gst_pipeline_set_auto_flush_bus( GST_PIPELINE(pipeline_), true);
// GstCaps *caps = gst_static_caps_get (&frame_render_caps);
// GstCaps *caps = gst_static_caps_get (&frame_render_caps);
std::string capstring = "video/x-raw,format=RGBA,width="+ std::to_string(media_.width) +
",height=" + std::to_string(media_.height);
GstCaps *caps = gst_caps_from_string(capstring.c_str());
@@ -403,7 +403,7 @@ void MediaPlayer::execute_open()
gst_caps_unref (caps);
#ifdef USE_GST_OPENGL_SYNC_HANDLER
// capture bus signals to force a unique opengl context for all GST elements
// capture bus signals to force a unique opengl context for all GST elements
Rendering::LinkPipeline(GST_PIPELINE (pipeline_));
#endif
@@ -684,7 +684,7 @@ MediaPlayer::LoopMode MediaPlayer::loop() const
{
return loop_;
}
void MediaPlayer::setLoop(MediaPlayer::LoopMode mode)
{
loop_ = mode;
@@ -1034,7 +1034,7 @@ void MediaPlayer::execute_loop_command()
{
if (loop_==LOOP_REWIND) {
rewind();
}
}
else if (loop_==LOOP_BIDIRECTIONAL) {
rate_ *= - 1.f;
execute_seek_command();
@@ -1053,7 +1053,7 @@ void MediaPlayer::execute_seek_command(GstClockTime target, bool force)
GstClockTime seek_pos = target;
// no target given
if (target == GST_CLOCK_TIME_NONE)
if (target == GST_CLOCK_TIME_NONE)
// create seek event with current position (rate changed ?)
seek_pos = position_;
// target is given but useless
@@ -1106,12 +1106,12 @@ void MediaPlayer::setPlaySpeed(double s)
if (media_.isimage)
return;
// bound to interval [-MAX_PLAY_SPEED MAX_PLAY_SPEED]
// bound to interval [-MAX_PLAY_SPEED MAX_PLAY_SPEED]
rate_ = CLAMP(s, -MAX_PLAY_SPEED, MAX_PLAY_SPEED);
// skip interval [-MIN_PLAY_SPEED MIN_PLAY_SPEED]
if (ABS(rate_) < MIN_PLAY_SPEED)
rate_ = SIGN(rate_) * MIN_PLAY_SPEED;
// apply with seek
execute_seek_command();
}