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[iOS/Objective-C] Audio Player tutorial using AVPlayer (AVFoundation) -- 1 본문

Programming/iOS

[iOS/Objective-C] Audio Player tutorial using AVPlayer (AVFoundation) -- 1

ㄷㅣㅆㅣ 2016. 2. 24. 12:10

[iOS/Objective-C] Audio Player tutorial using AVPlayer (AVFoundation) -- 1

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  이전에 비디오 플레이어 튜토리얼을 포스팅 했으니(2016/02/23 - [프로그래밍/iOS] - [iOS/Objective-C] Video Player tutorial using AVPlayer (AVFoundation)), 여세를 몰아 오디오 플레이어도 만들어보자.

  Last posting is Video Player Tutorial(2016/02/23 - [프로그래밍/iOS] - [iOS/Objective-C] Video Player tutorial using AVPlayer (AVFoundation)). so We'll make a simple audio player this time.


- 요구사항

  1) 백그라운드에서 플레이 되어야 한다.

  2) iOS의 Now Playing Info Center에 현재상태가 보여야 하고, 조정도 가능해야한다.

  3) 알림음과 다른 볼륨으로 가져가야한다.

  4) 벨소리/전화와 같은 인터럽트가 발생한 이후 다시 재생되어야 한다.

- Requirement

  1) It can play music background

  2) It can display current status on Now Playing Info Center(You can check if you swipe bottom to middle on your iPhone/iPad screen) and control music on it.

  3) The music volume must be different from Alarm sound

  4) It can be resumed after bell-ringing or phone call interrupt.


[1편에서는 일단 play하는 것 까지만 다룬다]

[At this time, I will post Just How to play music using AVPlayer/AVFoundation]


1. AudioManager

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@import AVFoundation;
@import MediaPlayer;
@import AudioToolbox;
#import <Foundation/Foundation.h>
#import "CFile.h"
 
@protocol AudioManagerDelegate <NSObject>
@optional
- (void)metadataExtracted;
- (void)playerStateChanged:(BOOL)isPlaying;
@end
 
@interface AudioManager : NSObject <AVAudioPlayerDelegate>
@property (nonatomic) NSInteger curTrackIndex;
@property (strong, nonatomic) NSArray<CFile *> *playlist;
@property (strong, nonatomic) NSString *curTitle;
@property (strong, nonatomic) NSString *curAlbumName;
@property (strong, nonatomic) NSString *curArtist;
@property (strong, nonatomic) UIImage *curAlbumImg;
 
@property (nonatomic, assign) id<AudioManagerDelegate> delegate;
 
+ (instancetype)sharedInstance;
- (void)prepareToPlay:(void (^)(BOOL bSuccess))complete;
- (void)playAudio;
- (void)pauseAudio;

// For auto playing prev/next music. (looping playlist)
- (void)playPrevAudioAutoStart:(BOOL)bAutoStart;
- (void)playNextAudioAutoStart:(BOOL)bAutoStart;

// Common control function
- (void)seekTo:(NSTimeInterval)value;
- (float)curAudioDuration;
- (NSTimeInterval)curAudioTime;
- (NSString *)curTrackName;

// Event from Now Playing Center
- (void)handleControlReceivedWithEvent:(UIEvent *)event;
@end
cs
 - 뷰 컨트롤러가 사라진 후에도 음악을 재생하려면 오디오 매니저를 두어서 처리한다.

 - If you want to play music when the view-controller dismissed, you can make AudioManager and use it in view-controller.


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- (void)prepareToPlay:(void (^)(BOOL bSuccess))complete {
 
    __block BOOL bPrepared = NO;
    
    if (filePath == nil) {
        // download audio files
        [self downloadAudioFile:cFile complete:^(BOOL bSuccess) {
            if (bSuccess) {
                NSURL *audioFileUrl = [NSURL fileURLWithPath:[cFile.filePath fullPath]];
                bPrepared = [self prepareAudioPlayerWithUrl:audioFileUrl];
            }
            
            if (complete) {
                complete (bSuccess && bPrepared);
            }
        }];
    } else {
        NSURL *audioFileUrl = [NSURL fileURLWithPath:filePath fullPath];
        bPrepared = [self prepareAudioPlayerWithUrl:audioFileUrl];
        
        if (complete) {
            complete(bPrepared);
        }
    } 
}
 
 
- (BOOL)prepareAudioPlayerWithUrl:(NSURL *)audioFileUrl {
    BOOL bPrepared = NO;
    NSError *error;
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioFileUrl error:&error];
    if (error == nil) {
        self.audioPlayer.delegate = self;
        bPrepared = [self.audioPlayer prepareToPlay];
        // Get metadata cuncurrently
        [self metadataFromFileUrl:audioFileUrl];
    } else {
        NSLog(@"====================== error : %@", error);
    }
    
    return bPrepared;
}
 
 
 
 
- (void)metadataFromFileUrl:(NSURL *)audioFileUrl {
    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:audioFileUrl options:nil];
    NSArray *keys = @[@"commonMetadata"];
    
    self.curTitle = @"";
    self.curAlbumName = @"";
    self.curArtist = @"";
    self.curAlbumImg = nil;
    
    [asset loadValuesAsynchronouslyForKeys:keys completionHandler:^() {
        NSError *error = nil;
        AVKeyValueStatus metadataStatus = [asset statusOfValueForKey:@"commonMetadata" error:&error];
        switch (metadataStatus) {
            case AVKeyValueStatusLoaded:{
                for (AVMetadataItem *item in [asset commonMetadata]) {
                    if ([item.commonKey isEqualToString:AVMetadataCommonKeyTitle]) {
                        self.curTitle = item.stringValue;
                    } else if ([item.commonKey isEqualToString:AVMetadataCommonKeyAlbumName]) {
                        self.curAlbumName = item.stringValue;
                    } else if ([item.commonKey isEqualToString:AVMetadataCommonKeyArtist]) {
                        self.curArtist = item.stringValue;
                    } else if ([item.commonKey isEqualToString:AVMetadataCommonKeyArtwork]) {
                        self.curAlbumImg = [UIImage imageWithData:[item.value copyWithZone:nil]];
                    }
                }
                
                if ([self.delegate respondsToSelector:@selector(metadataExtracted)]) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        // Metadata notification for view update. 
                        [self.delegate metadataExtracted];
                    });
                }
                
                dispatch_async(dispatch_get_main_queue(), ^{
                    [self updatePlayingInfoCenter];
                });
                break;
            }
                
            default:
                NSLog(@"error - status:%ld, error:%@", (long)metadataStatus, error);
                break;
        }
    }];
}
 
 
- (void)updatePlayingInfoCenter {
    NSMutableDictionary *playingInfo = [NSMutableDictionary dictionary];
    playingInfo[MPMediaItemPropertyAlbumTitle] = self.curAlbumName;
    playingInfo[MPMediaItemPropertyArtist] = self.curArtist;
    playingInfo[MPMediaItemPropertyTitle] = (0<self.curTitle.length?self.curTitle:self.curTrackName);
    playingInfo[MPMediaItemPropertyPlaybackDuration] = @(ceil(self.curAudioDuration));
    playingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = @(self.curAudioTime);
    playingInfo[MPNowPlayingInfoPropertyPlaybackRate] = @(1);
    playingInfo[MPNowPlayingInfoPropertyPlaybackQueueIndex] = @(self.curTrackIndex);
    
    if (self.curAlbumImg != nil) {
        // You can see the album art on lock screen if you set this.
        MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:self.curAlbumImg];
        playingInfo[MPMediaItemPropertyArtwork] = artwork;
    }
    
    [MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = playingInfo;
}
 
 
 
- (void)playAudio {
    [[AVAudioSession sharedInstance] setActive:YES error:nil];
    if ([self.audioPlayer play]) {
        MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
        // Set current time to Now Playing Center.
 
        // mutable로 안하면 기존 정보가 지워짐. 문서에 안나옴. 왜그런지 모름.
        // You should use mutable dictionary. otherwise, all information you set before will be lost.
 
        NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];
        playingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = @(self.audioPlayer.currentTime);
        center.nowPlayingInfo = playingInfo;
    }
    
    if ([self.delegate respondsToSelector:@selector(playerStateChanged:)]) {
        [self.delegate playerStateChanged:self.audioPlayer.isPlaying];
    }
}
 
cs



2. View Controller.

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- (void)viewDidLoad {
    [super viewDidLoad];
 
    // running time slide bar setting.
    [self.runningTimeSlider setThumbImage:[UIImage imageNamed:@"YOUR_HANDLE_ICON"] forState:UIControlStateNormal];
    [self.runningTimeSlider setThumbImage:[UIImage imageNamed:@"YOUR_HANDLE_ICON_HIGHLIGHTED"] forState:UIControlStateHighlighted];
    [self.runningTimeSlider setMaximumValue:[[AudioManager sharedInstance] curAudioDuration]];
 
    [self.runningTimeSlider setValue:0.0];
    
    // play music automatically
    [[AudioManager sharedInstance] setDelegate:self];
    [[AudioManager sharedInstance] setPlaylist:self.playlist];
    [[AudioManager sharedInstance] prepareToPlay:^(BOOL bSuccess) {
        [[AudioManager sharedInstance] playAudio];
    }];
}
 
cs

 - Just Use Audio Manager :)

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