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/scene/resources/audio_stream_sample.cpp b/scene/resources/audio_stream_sample.cpp
index 30c222bdff..dcd36284d4 100644
--- a/scene/resources/audio_stream_sample.cpp
+++ b/scene/resources/audio_stream_sample.cpp
@@ -406,6 +406,10 @@ int AudioStreamPlaybackSample::mix(AudioFrame *p_buffer, float p_rate_scale, int
 	return p_frames;
 }
 
+void AudioStreamPlaybackSample::tag_used_streams() {
+	base->tag_used(get_playback_position());
+}
+
 AudioStreamPlaybackSample::AudioStreamPlaybackSample() {}
 
 /////////////////////
@@ -599,7 +603,7 @@ Error AudioStreamSample::save_to_wav(const String &p_path) {
 	return OK;
 }
 
-Ref<AudioStreamPlayback> AudioStreamSample::instance_playback() {
+Ref<AudioStreamPlayback> AudioStreamSample::instantiate_playback() {
 	Ref<AudioStreamPlaybackSample> sample;
 	sample.instantiate();
 	sample->base = Ref<AudioStreamSample>(this);