fix: reduce audio polling

Addresses #411

I cannot reproduce the 100% CPU utilization; however, maybe this is a Flutter FFI bug with a specific version or environment.

@luigi-rosso, in the linked issue, you mention a `TrackingAudioPlayer.` It's not clear to me when we would need that at this stage of the audio capabilities we provide.

Currently polling every second. This is arbitrary, any suggestions on a value?

Diffs=
eccfca528 fix: reduce audio polling (#8238)
4566a1208 Clone draw for cache optimizations (#8176)
56511a285 Fix layout drag/drop offset (#8220)
f0c58200a fix text origin offset (#8223)
35734d2d5 change dash formula precision (#8219)
be2c46a3e add bindable layout properties (#8212)
cea19ecc6 add new properties to data bind (#8211)
e67109195 Layout text size fix (#8209)
77b9ee56d Add linux build step for rive_native changes (#8194)
37663bd03 advance iterator until distance does not equal 0 (#8165)
1713983ab runtime dashing! (#8191)
d0d1dbf33 fix dash glitch (#8188)
8a974784d Dashing (through the snow) (#8093)
9e4b81762 Update player to run without the python server (#8175)
aa91ffe21 Rename gpuAtomicResolve -> atomicResolve, et. al. (#8168)
adc240554 Overhaul Vulkan synchronization (#8166)
9dd20080c Remove Skia from ios_tests and quit building it on many runners (#8144)
5cdcc183f Nnnn data context fixes (#8148)
7e8100fee Colinear and bounds ffi (#8158)
15d3e9961 add support for elastic interpolation (#8154)
95e58ca40 editor: Stage UI for N-Slicing (#8136)
5719c5662 Add contour measure to Rive Native (#8145)
8441098ec adding length getter to dash path effect (#8140)

Co-authored-by: Gordon <[email protected]>

.rive_head

@@ -1 +1 @@
-95cad5c6055750ff6b1c033f903967e6b9c22bb6
+eccfca52894894d158761f902f46ed48b0794991

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.13.14
+
+- Reduce audio polling and unneeded runtime calculations around audio. Resolves issue [411](https://github.com/rive-app/rive-flutter/issues/411)
+
 ## 0.13.13
 
 - Update Android `minSdkVersion` from 16 to 19

lib/src/rive_core/audio_player.dart

@@ -5,14 +5,10 @@ import 'package:rive/src/rive_core/assets/audio_asset.dart';
 import 'package:rive_common/rive_audio.dart';
 
 class AudioPlayer {
-  final ValueNotifier<Duration> time = ValueNotifier(Duration.zero);
-  final ValueNotifier<double> normalizedTime = ValueNotifier(0);
   final ValueNotifier<bool> isPlaying = ValueNotifier(false);
   AudioEngine? _engine;
   AudioEngine? get engine => _engine;
   final List<AudioSound> _sounds = [];
-  int _soundStartTime = 0;
-  Duration _soundDuration = Duration.zero;
 
   Timer? _timer;
 
@@ -69,10 +65,7 @@ class AudioPlayer {
       sound.volume = volume;
     }
     _sounds.add(sound);
-    _soundDuration = source.duration;
-    _soundStartTime = engineTime -
-        (startTime.inMicroseconds * 1e-6 * engine.sampleRate).round();
-    _timer ??= Timer.periodic(const Duration(milliseconds: 0), _frameCallback);
+    _timer ??= Timer.periodic(const Duration(seconds: 1), _frameCallback);
   }
 
   bool playSource(AudioAsset? audio) {
@@ -92,7 +85,7 @@ class AudioPlayer {
       sound.volume = audio?.volume ?? 1;
     }
     _sounds.add(sound);
-    _timer ??= Timer.periodic(const Duration(milliseconds: 0), _frameCallback);
+    _timer ??= Timer.periodic(const Duration(seconds: 1), _frameCallback);
     return true;
   }
 
@@ -101,28 +94,23 @@ class AudioPlayer {
     if (engine == null) {
       return;
     }
-    var elapsedAudioFrames = engine.timeInFrames - _soundStartTime;
-    time.value = Duration(
-        microseconds: (elapsedAudioFrames / engine.sampleRate / 1e-6).floor());
-    normalizedTime.value = _soundDuration == Duration.zero
-        ? 0
-        : (time.value.inMicroseconds / _soundDuration.inMicroseconds)
-            .clamp(0, 1);
 
     var completed = _sounds.where((sound) => sound.completed).toList();
 
     _sounds.removeWhere((sound) => sound.completed);
     for (final sound in completed) {
       sound.dispose();
     }
+    if (_sounds.isEmpty) {
+      _timer?.cancel();
+      _timer = null;
+    }
   }
 
   void stop() {
     isPlaying.value = false;
     _timer?.cancel();
     _timer = null;
-    time.value = Duration.zero;
-    normalizedTime.value = 0;
     for (final sound in _sounds) {
       sound.stop();
       sound.dispose();

pubspec.yaml

@@ -1,5 +1,5 @@
 name: rive
-version: 0.13.13
+version: 0.13.14
 homepage: https://rive.app
 description: Rive Flutter Runtime. This package provides runtime functionality for playing back and interacting with animations built with the Rive editor available at https://rive.app.
 repository: https://github.com/rive-app/rive-flutter