Implement BPM support

Based on #62896, only implements the BPM support part.

* Implements BPM support in the AudioStreamOGG/MP3 importers.
* Can select BPM/Bar Size and total beats in a song file, as well as edit looping points.
* Looping is now BPM aware
* Added a special importer UI for configuring this.
* Added a special preview showing the audio waveform as well as the playback position in the resource picker.
* Renamed `AudioStream::instance` to `instantiate` for correctness.

1 files changed, 5 insertions, 1 deletions

diff --git a/servers/audio/effects/audio_stream_generator.cpp b/servers/audio/effects/audio_stream_generator.cpp
index 46de1692e4..6365dacc80 100644
--- a/servers/audio/effects/audio_stream_generator.cpp
+++ b/servers/audio/effects/audio_stream_generator.cpp
@@ -46,7 +46,7 @@ float AudioStreamGenerator::get_buffer_length() const {
 	return buffer_len;
 }
 
-Ref<AudioStreamPlayback> AudioStreamGenerator::instance_playback() {
+Ref<AudioStreamPlayback> AudioStreamGenerator::instantiate_playback() {
 	Ref<AudioStreamGeneratorPlayback> playback;
 	playback.instantiate();
 	playback->generator = this;
@@ -196,6 +196,10 @@ void AudioStreamGeneratorPlayback::seek(float p_time) {
 	//no seek possible
 }
 
+void AudioStreamGeneratorPlayback::tag_used_streams() {
+	generator->tag_used(0);
+}
+
 void AudioStreamGeneratorPlayback::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("push_frame", "frame"), &AudioStreamGeneratorPlayback::push_frame);
 	ClassDB::bind_method(D_METHOD("can_push_buffer", "amount"), &AudioStreamGeneratorPlayback::can_push_buffer);