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Draft feature Live change of Media player pipeline

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Intended for adding effects (e.g. Frei0r). Not active yet.
This commit is contained in:
Bruno Herbelin
2023-06-12 01:04:38 +02:00
parent c846a0626f
commit e48a963503
2 changed files with 84 additions and 12 deletions
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94
src/MediaPlayer.cpp
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@@ -310,19 +310,11 @@ void MediaPlayer::execute_open()
if (media_.interlaced)
description += "deinterlace method=2 ! ";
// effect
description += "videoconvert name=prev ! identity name=effect ! ";
// video convertion algorithm (should only do colorspace conversion, no scaling)
// chroma-resampler:
// Duplicates the samples when upsampling and drops when downsampling 0
// Uses linear interpolation 1 (default)
// Uses cubic interpolation 2
// Uses sinc interpolation 3
// dither:
// no dithering 0
// propagate rounding errors downwards 1
// Dither with floyd-steinberg error diffusion 2
// Dither with Sierra Lite error diffusion 3
// ordered dither using a bayer pattern 4 (default)
description += "videoconvert chroma-resampler=1 dither=0 ! "; // fast
description += "videoconvert name=post ! "; // fast
// hack to compensate for lack of PTS in gif animations
if (media_.codec_name.compare("image/gst-libav-gif") == 0){
@@ -435,6 +427,84 @@ void MediaPlayer::execute_open()
MediaPlayer::registered_.push_back(this);
}
bool MediaPlayer::setEffect(const std::string &pipeline_element)
{
if ( pipeline_ == nullptr )
return false;
// try to create the pipeline element given
GError *error = NULL;
std::string elem = pipeline_element + " name=effect ";
GstElement *el = gst_parse_launch( elem.c_str(), &error);
if (error != NULL) {
Log::Warning("MediaPlayer %s Error constructing %s:\n%s", std::to_string(id_).c_str(), pipeline_element.c_str(), error->message);
g_clear_error (&error);
return false;
}
if (el == NULL) {
Log::Warning("MediaPlayer %s Could not parse %s", std::to_string(id_).c_str(), pipeline_element.c_str());
return false;
}
// find all GST elements needed
GstElement *effect = gst_bin_get_by_name (GST_BIN (pipeline_), "effect");
if (!effect) {
Log::Warning("MediaPlayer %s Could not find effect", std::to_string(id_).c_str());
return false;
}
GstElement *prev = gst_bin_get_by_name (GST_BIN (pipeline_), "prev");
if (!prev) {
Log::Warning("MediaPlayer %s Could not find prev", std::to_string(id_).c_str());
return false;
}
GstElement *post = gst_bin_get_by_name (GST_BIN (pipeline_), "post");
if (!post) {
Log::Warning("MediaPlayer %s Could not find post", std::to_string(id_).c_str());
return false;
}
// PAUSE pipeline
execute_play_command(false);
// assume failure
bool success = false;
// remove the previous effect (this deconnects from prev and post)
gst_object_ref(effect);
if (gst_bin_remove (GST_BIN (pipeline_), effect) ) {
// add new element to the pipeline
if ( gst_bin_add (GST_BIN (pipeline_), el) ) {
// reconnect pipeline
if ( gst_element_link_many (prev, el, post, NULL) )
// all good !! success !!
success = true;
else {
gst_bin_remove (GST_BIN (pipeline_), el);
Log::Warning("MediaPlayer %s Could not re-link effect", std::to_string(id_).c_str());
}
}
else
Log::Warning("MediaPlayer %s Could not add new effect", std::to_string(id_).c_str());
if (success)
// can delete effect
gst_object_unref(effect);
else {
// restore effect into the pileline
gst_bin_add (GST_BIN (pipeline_), effect);
gst_element_link_many (prev, effect, post, NULL);
}
}
else
Log::Warning("MediaPlayer %s Could not remove effect", std::to_string(id_).c_str());
// PLAY pipeline
execute_play_command(true);
return success;
}
bool MediaPlayer::isOpen() const
{
return opened_;