From Buzztard

In buzz one can connect e.g. the soundcard input to some machines and would immediately hear what happens. Likewise one can activate a machine and play notes and hear the sound.

Idea

After loading a song, we set the pipeline to play. It will loop a small range. When the user presses play, we interrupt the loop and start to play from the play-cursor. The small live-loop need to be located in time, either before or after the song. I suggest G_MAXUINT64-GST_SECOND ... G_MAXUINT64-1.

We need a method to start and end this looping (like e.g. bt_song_idle_start() and _stop()). One would then do:

song=bt_song_new(BT_APPLICATION(self));
bt_song_io_load(loader,song);
bt_song_idle_start(song);

When the user presses the play button:

bt_song_idle_stop(song);
bt_song_play(song);

When the user presses stop or pause, or EOS occured:

bt_song_stop(song);
bt_song_idle_start(song);

When destroying the song:

if(self->priv->is_playing) bt_song_stop(song);
else bt_song_idle_stop(song);

The bt_song_idle_start() methods would be something like bt_song_play() but using a different seek.

Notes

bt-cmd does generally not want this :). Thus maybe the app should activate/deactivate the idle mode. This can be done by having an interactive flag in the song. If TRUE song would use the idle loop.