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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This is a Vala-rewrite of GStreamer snapshot example. Adapted from earlier
* work from Wim Taymans.
*
* This software is licensed under the GNU LGPL (version 2.1 or later).
* See the COPYING file in this distribution.
*/
// Shotwell Thumbnailer takes in a video file and returns a thumbnail to stdout. This is
// a replacement for totem-video-thumbnailer
class ShotwellThumbnailer {
const string caps_string = """video/x-raw,format=RGB,pixel-aspect-ratio=1/1""";
public static int main(string[] args) {
Gst.Element pipeline, sink;
string descr;
Gdk.Pixbuf pixbuf;
uint8[]? pngdata;
int64 duration, position;
Gst.StateChangeReturn ret;
if (Posix.nice (19) < 0) {
debug ("Failed to reduce thumbnailer nice level. Continuing anyway");
}
Gst.init(ref args);
var registry = Gst.Registry.@get ();
var features = registry.feature_filter ((f) => {
return f.get_name ().has_prefix ("vaapi");
}, false);
foreach (var feature in features) {
debug ("Removing registry feature %s", feature.get_name ());
registry.remove_feature (feature);
}
if (args.length != 2) {
stdout.printf("usage: %s [filename]\n Writes video thumbnail to stdout\n", args[0]);
return 1;
}
descr = "filesrc location=\"%s\" ! decodebin ! videoconvert ! videoscale ! ".printf(args[1]) +
"%s ! gdkpixbufsink name=sink".printf(caps_string);
try {
// Create new pipeline.
pipeline = Gst.parse_launch(descr);
// Get sink.
sink = ((Gst.Bin) pipeline).get_by_name("sink");
// Set to PAUSED to make the first frame arrive in the sink.
ret = pipeline.set_state(Gst.State.PAUSED);
if (ret == Gst.StateChangeReturn.FAILURE) {
warning("Failed to play the file: couldn't set state\n");
return 3;
} else if (ret == Gst.StateChangeReturn.NO_PREROLL) {
warning("Live sources not supported yet.\n");
return 4;
}
// This can block for up to 5 seconds. If your machine is really overloaded,
// it might time out before the pipeline prerolled and we generate an error. A
// better way is to run a mainloop and catch errors there.
ret = pipeline.get_state(null, null, 5 * Gst.SECOND);
if (ret == Gst.StateChangeReturn.FAILURE) {
warning("Failed to play the file: couldn't get state.\n");
return 3;
}
/* get the duration */
if (!pipeline.query_duration (Gst.Format.TIME, out duration)) {
warning("Failed to query file for duration\n");
return 3;
}
position = 1 * Gst.SECOND;
/* seek to the a position in the file. Most files have a black first frame so
* by seeking to somewhere else we have a bigger chance of getting something
* more interesting. An optimisation would be to detect black images and then
* seek a little more */
pipeline.seek_simple (Gst.Format.TIME, Gst.SeekFlags.KEY_UNIT | Gst.SeekFlags.FLUSH, position);
ret = pipeline.get_state(null, null, 5 * Gst.SECOND);
if (ret == Gst.StateChangeReturn.FAILURE) {
warning("Failed to play the file: couldn't get state.\n");
return 3;
}
sink.get ("last-pixbuf", out pixbuf);
// Save the pixbuf.
pixbuf.save_to_buffer(out pngdata, "png");
stdout.write(pngdata);
// cleanup and exit.
pipeline.set_state(Gst.State.NULL);
} catch (Error e) {
warning(e.message);
return 2;
}
return 0;
}
}
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