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Ignore canPlayFast(Slow)Forward on iOS which seems to be unreliable.

This commit is contained in:
Ryan Heise 2020-10-24 18:40:20 +11:00
parent d2de8a89f9
commit 3cf2f502fc
1 changed files with 29 additions and 7 deletions
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36
just_audio/darwin/Classes/AudioPlayer.m
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@ -960,13 +960,35 @@
}
- (void)setSpeed:(float)speed {
if (speed == 1.0
|| (speed < 1.0 && _player.currentItem.canPlaySlowForward)
|| (speed > 1.0 && _player.currentItem.canPlayFastForward)) {
_speed = speed;
if (_playing) {
_player.rate = speed;
}
// NOTE: We ideally should check _player.currentItem.canPlaySlowForward and
// canPlayFastForward, but these properties are unreliable and the official
// documentation is unclear and contradictory.
//
// Source #1:
// https://developer.apple.com/documentation/avfoundation/avplayer/1388846-rate?language=objc
//
// Rates other than 0.0 and 1.0 can be used if the associated player
// item returns YES for the AVPlayerItem properties canPlaySlowForward
// or canPlayFastForward.
//
// Source #2:
// https://developer.apple.com/library/archive/qa/qa1772/_index.html
//
// An AVPlayerItem whose status property equals
// AVPlayerItemStatusReadyToPlay can be played at rates between 1.0 and
// 2.0, inclusive, even if AVPlayerItem.canPlayFastForward is NO.
// AVPlayerItem.canPlayFastForward indicates whether the item can be
// played at rates greater than 2.0.
//
// But in practice, it appears that even if AVPlayerItem.canPlayFastForward
// is NO, rates greater than 2.0 still work sometimes.
//
// So for now, we just let the app pass in any speed and hope for the best.
// There is no way to reliably query whether the requested speed is
// supported.
_speed = speed;
if (_playing) {
_player.rate = speed;
}
[self updatePosition];
}