just_audio/ios/Classes/AudioPlayer.m

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2019-11-30 15:28:17 +00:00
#import "AudioPlayer.h"
#import <AVFoundation/AVFoundation.h>
// TODO: Check for and report invalid state transitions.
@implementation AudioPlayer {
NSObject<FlutterPluginRegistrar>* _registrar;
FlutterMethodChannel* _methodChannel;
FlutterEventChannel* _eventChannel;
FlutterEventSink _eventSink;
NSString* _playerId;
AVPlayer* _player;
enum PlaybackState _state;
enum PlaybackState _stateBeforeSeek;
long long _updateTime;
int _updatePosition;
int _seekPos;
FlutterResult _connectionResult;
id _endObserver;
id _timeObserver;
}
- (instancetype)initWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar playerId:(NSString*)idParam {
self = [super init];
NSAssert(self, @"super init cannot be nil");
_registrar = registrar;
_playerId = idParam;
_methodChannel = [FlutterMethodChannel
methodChannelWithName:[NSMutableString stringWithFormat:@"com.ryanheise.just_audio.methods.%@", _playerId]
binaryMessenger:[registrar messenger]];
_eventChannel = [FlutterEventChannel
eventChannelWithName:[NSMutableString stringWithFormat:@"com.ryanheise.just_audio.events.%@", _playerId]
binaryMessenger:[registrar messenger]];
[_eventChannel setStreamHandler:self];
_state = none;
_stateBeforeSeek = none;
_player = nil;
_seekPos = -1;
_endObserver = 0;
_timeObserver = 0;
__weak __typeof__(self) weakSelf = self;
[_methodChannel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
[weakSelf handleMethodCall:call result:result];
}];
return self;
}
- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
NSArray* args = (NSArray*)call.arguments;
if ([@"setUrl" isEqualToString:call.method]) {
[self setUrl:args[0] result:result];
} else if ([@"play" isEqualToString:call.method]) {
[self play:args[0]];
result(nil);
} else if ([@"pause" isEqualToString:call.method]) {
[self pause];
result(nil);
} else if ([@"stop" isEqualToString:call.method]) {
[self stop];
result(nil);
} else if ([@"setVolume" isEqualToString:call.method]) {
[self setVolume:(float)[args[0] doubleValue]];
result(nil);
} else if ([@"setSpeed" isEqualToString:call.method]) {
[self setSpeed:(float)[args[0] doubleValue]];
result(nil);
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} else if ([@"seek" isEqualToString:call.method]) {
[self seek:[args[0] intValue] result:result];
result(nil);
} else if ([@"dispose" isEqualToString:call.method]) {
[self dispose];
result(nil);
} else {
result(FlutterMethodNotImplemented);
}
// TODO
/* } catch (Exception e) { */
/* e.printStackTrace(); */
/* result.error("Error", null, null); */
/* } */
}
- (FlutterError*)onListenWithArguments:(id)arguments eventSink:(FlutterEventSink)eventSink {
_eventSink = eventSink;
return nil;
}
- (FlutterError*)onCancelWithArguments:(id)arguments {
_eventSink = nil;
return nil;
}
- (void)checkForDiscontinuity {
if (!_eventSink) return;
if (_state != playing && _state != buffering) return;
long long now = (long long)([[NSDate date] timeIntervalSince1970] * 1000.0);
int position = [self getCurrentPosition];
long long timeSinceLastUpdate = now - _updateTime;
long long expectedPosition = _updatePosition + (long long)(timeSinceLastUpdate * _player.rate);
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long long drift = position - expectedPosition;
// Update if we've drifted or just started observing
if (_updateTime == 0L) {
[self broadcastPlaybackEvent];
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} else if (drift < -100) {
NSLog(@"time discontinuity detected: %lld", drift);
[self setPlaybackState:buffering];
} else if (_state == buffering) {
[self setPlaybackState:playing];
}
}
- (void)broadcastPlaybackEvent {
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long long now = (long long)([[NSDate date] timeIntervalSince1970] * 1000.0);
_updatePosition = [self getCurrentPosition];
_updateTime = now;
_eventSink(@[
// state
@(_state),
// updatePosition
@(_updatePosition),
// updateTime
@(_updateTime),
]);
}
- (int)getCurrentPosition {
if (_state == none || _state == connecting) {
return 0;
} else if (_seekPos != -1) {
return _seekPos;
} else {
return (int)(1000 * CMTimeGetSeconds([_player currentTime]));
}
}
- (void)setPlaybackState:(enum PlaybackState)state {
//enum PlaybackState oldState = _state;
_state = state;
// TODO: Investigate when we need to start and stop
// observing item position.
/* if (oldState != playing && state == playing) { */
/* [self startObservingPosition]; */
/* } */
[self broadcastPlaybackEvent];
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}
- (void)setUrl:(NSString*)url result:(FlutterResult)result {
// TODO: error if already connecting
_connectionResult = result;
[self setPlaybackState:connecting];
if (_player) {
[[_player currentItem] removeObserver:self forKeyPath:@"status"];
[[NSNotificationCenter defaultCenter] removeObserver:_endObserver];
_endObserver = 0;
}
AVPlayerItem* playerItem = [[AVPlayerItem alloc] initWithURL:[NSURL URLWithString:url]];
[playerItem addObserver:self
forKeyPath:@"status"
options:NSKeyValueObservingOptionNew
context:nil];
// TODO: Add observer for _endObserver.
_endObserver = [[NSNotificationCenter defaultCenter]
addObserverForName:AVPlayerItemDidPlayToEndTimeNotification
object:playerItem
queue:nil
usingBlock:^(NSNotification* note) {
NSLog(@"Reached play end time");
[self stop];
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}
];
if (_player) {
[_player replaceCurrentItemWithPlayerItem:playerItem];
} else {
_player = [[AVPlayer alloc] initWithPlayerItem:playerItem];
}
if (_timeObserver) {
[_player removeTimeObserver:_timeObserver];
_timeObserver = 0;
}
// TODO: learn about the different ways to define weakSelf.
//__weak __typeof__(self) weakSelf = self;
//typeof(self) __weak weakSelf = self;
__unsafe_unretained typeof(self) weakSelf = self;
_timeObserver = [_player addPeriodicTimeObserverForInterval:CMTimeMake(200, 1000)
queue:nil
usingBlock:^(CMTime time) {
[weakSelf checkForDiscontinuity];
}
];
// We send result after the playerItem is ready in observeValueForKeyPath.
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary<NSString *,id> *)change
context:(void *)context {
if ([keyPath isEqualToString:@"status"]) {
AVPlayerItemStatus status = AVPlayerItemStatusUnknown;
NSNumber *statusNumber = change[NSKeyValueChangeNewKey];
if ([statusNumber isKindOfClass:[NSNumber class]]) {
status = statusNumber.integerValue;
}
switch (status) {
case AVPlayerItemStatusReadyToPlay:
[self setPlaybackState:stopped];
_connectionResult(@((int)(1000 * CMTimeGetSeconds([[_player currentItem] duration]))));
break;
case AVPlayerItemStatusFailed:
NSLog(@"AVPlayerItemStatusFailed");
_connectionResult(nil);
break;
case AVPlayerItemStatusUnknown:
break;
}
}
}
- (void)play:(NSNumber*)untilPosition {
// TODO: dynamically adjust the lag.
//int lag = 6;
int start = [self getCurrentPosition];
if (untilPosition != [NSNull null] && [untilPosition intValue] <= start) {
return;
}
[_player play];
[self setPlaybackState:playing];
// TODO: convert this Android code to iOS
/* if (endDetector != null) { */
/* handler.removeCallbacks(endDetector); */
/* } */
/* if (untilPosition != null) { */
/* final int duration = Math.max(0, untilPosition - start - lag); */
/* handler.postDelayed(new Runnable() { */
/* @Override */
/* public void run() { */
/* final int position = getCurrentPosition(); */
/* if (position > untilPosition - 20) { */
/* pause(); */
/* } else { */
/* final int duration = Math.max(0, untilPosition - position - lag); */
/* handler.postDelayed(this, duration); */
/* } */
/* } */
/* }, duration); */
/* } */
}
- (void)pause {
[_player pause];
[self setPlaybackState:paused];
}
- (void)stop {
[_player pause];
[_player seekToTime:CMTimeMake(0, 1000)
completionHandler:^(BOOL finished) {
[self setPlaybackState:stopped];
}];
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}
- (void)setVolume:(float)volume {
[_player setVolume:volume];
}
- (void)setSpeed:(float)speed {
if (speed == 1.0
|| speed < 1.0 && _player.currentItem.canPlaySlowForward
|| speed > 1.0 && _player.currentItem.canPlayFastForward) {
_player.rate = speed;
}
}
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- (void)seek:(int)position result:(FlutterResult)result {
_stateBeforeSeek = _state;
_seekPos = position;
NSLog(@"seek. enter buffering");
[self setPlaybackState:buffering];
[_player seekToTime:CMTimeMake(position, 1000)
completionHandler:^(BOOL finished) {
NSLog(@"seek completed");
[self onSeekCompletion:result];
}];
}
- (void)onSeekCompletion:(FlutterResult)result {
_seekPos = -1;
[self setPlaybackState:_stateBeforeSeek];
_stateBeforeSeek = none;
result(nil);
}
- (void)dispose {
if (_state != none) {
[self stop];
[self setPlaybackState:none];
}
}
@end