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SMKMPMusicPlayer.m
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SMKMPMusicPlayer.m
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//
// SMKMPMusicPlayer.m
// SNRMusicKit
//
// Created by Indragie Karunaratne on 2012-08-28.
// Copyright (c) 2012 Indragie Karunaratne. All rights reserved.
//
#import "SMKMPMusicPlayer.h"
#import "SMKMPMediaTrack.h"
#import "SMKErrorCodes.h"
#import "NSError+SMKAdditions.h"
@interface SMKMPMusicPlayer ()
@property (nonatomic, strong, readwrite) MPMusicPlayerController *audioPlayer;
@property (nonatomic, strong, readwrite) MPMusicPlayerController *preloadAudioPlayer;
@property (nonatomic, assign, readwrite) BOOL playing;
@property (nonatomic, strong) id<SMKTrack> oldCurrentTrack;
@property (nonatomic, strong) id<SMKTrack> preloadedTrack;
@end
@implementation SMKMPMusicPlayer
- (id)init
{
if ((self = [super init])) {
self.audioPlayer = [MPMusicPlayerController iPodMusicPlayer];
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(_playbackStateDidChange:) name:MPMusicPlayerControllerPlaybackStateDidChangeNotification object:self.audioPlayer];
[nc addObserver:self selector:@selector(_nowPlayingItemDidChange:) name:MPMusicPlayerControllerNowPlayingItemDidChangeNotification object:self.audioPlayer];
[self.audioPlayer beginGeneratingPlaybackNotifications];
self.audioPlayer.repeatMode = MPMusicRepeatModeNone;
self.audioPlayer.shuffleMode = MPMusicShuffleModeOff;
self.seekTimeInterval = SMKPlayerDefaultSeekTimeInterval;
}
return self;
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
#pragma mark - SMKPlayer
+ (NSSet *)supportedContentSourceClasses
{
return [NSSet setWithObject:NSClassFromString(@"SMKMPMediaContentSource")];
}
+ (BOOL)supportsPreloading
{
return NO;
}
- (BOOL)supportsSeeking
{
return YES;
}
- (id<SMKTrack>)currentTrack
{
return self.oldCurrentTrack;
}
- (void)playTrack:(id<SMKTrack>)track completionHandler:(void(^)(NSError *error))handler
{
if ([track isKindOfClass:[SMKMPMediaTrack class]]) {
SMKMPMediaTrack *mediaTrack = (SMKMPMediaTrack *)track;
MPMediaItem *mediaItem = mediaTrack.representedObject;
MPMediaItemCollection *collection = [MPMediaItemCollection collectionWithItems:@[mediaItem]];
[self.audioPlayer setQueueWithItemCollection:collection];
[self.audioPlayer play];
if (handler) { handler(nil); }
} else if (handler) {
NSError *error = [NSError SMK_errorWithCode:SMKPlayerErrorFailedToEnqueueTrack description:@"MPMusicPlayerController failed to play the track because the object was of the wrong type. Expected SMKMPMediaTrack"];
handler(error);
}
}
- (void)pause
{
[self.audioPlayer pause];
}
- (void)play
{
[self.audioPlayer play];
}
- (NSTimeInterval)playbackTime
{
return self.audioPlayer.currentPlaybackTime;
}
+ (NSSet *)keyPathsForValuesAffectingPlaybackTime
{
return [NSSet setWithObject:@"audioPlayer.currentPlaybackTime"];
}
- (void)seekToPlaybackTime:(NSTimeInterval)time
{
self.audioPlayer.currentPlaybackTime = time;
}
- (void)seekBackward
{
self.audioPlayer.currentPlaybackTime = self.audioPlayer.currentPlaybackTime - self.seekTimeInterval;
}
- (void)seekForward
{
self.audioPlayer.currentPlaybackTime = self.audioPlayer.currentPlaybackTime + self.seekTimeInterval;
}
#pragma mark - Notifications
- (void)_playbackStateDidChange:(NSNotification *)notification
{
self.playing = self.audioPlayer.playbackState == MPMusicPlaybackStatePlaying;
}
- (void)_nowPlayingItemDidChange:(NSNotification *)notification
{
if (!self.audioPlayer.nowPlayingItem && self.finishedTrackBlock) {
self.finishedTrackBlock(self, self.oldCurrentTrack, nil);
self.oldCurrentTrack = nil;
}
}
@end