Base class for audio streams. Base class for audio streams. Audio streams are used for sound effects and music playback, and support WAV (via [AudioStreamSample]) and OGG (via [AudioStreamOGGVorbis]) file formats. $DOCS_URL/03_usage/09_audio/02_audio_streams.md $DOCS_URL/07_demo_projects/audio/generator $DOCS_URL/07_demo_projects/audio/mic_record $DOCS_URL/07_demo_projects/audio/spectrum Returns the length of the audio stream in seconds.