iphone – iOS AVPlayer流媒体音乐问题

概述我对AVPlayer有一些非常奇怪的问题.我有一个非常简单的音乐播放器(从iTunes商店流式传输样本音乐)在模拟器上正确使用它(iPhone和iPad都带有iOS 5.1),但它在真实设备上表现异常. 在带有iOS 5.1.1的iPad 2上,即使我将耳机连接到设备,它也能正常播放.但是一旦我断开它们就不会通过扬声器发出声音(即使我再次连接它们,我也可以听这首歌). 在安装了iOS 5.1的iP 我对AVPlayer有一些非常奇怪的问题.我有一个非常简单的音乐播放器(从iTunes商店流式传输样本音乐)在模拟器上正确使用它(iPhone和iPad都带有iOS 5.1),但它在真实设备上表现异常.

在带有iOS 5.1.1的iPad 2上,即使我将耳机连接到设备,它也能正常播放.但是一旦我断开它们就不会通过扬声器发出声音(即使我再次连接它们,我也可以听这首歌).

在安装了iOS 5.1的iPhone 4上,它似乎无法通过扬声器播放,但我可以通过耳机收听音乐.虽然它似乎没有通过扬声器播放,我可以偶尔听到音乐播放的短暂时间(并且可以确认它实际上正在播放,因为我的UI响应相应)虽然它似乎是随机的.

我正在使用AVPlayer,因为它似乎符合要求.我应该使用其他图书馆吗？我需要手动路由声音吗？为什么我遇到这些类型的问题？我正确使用音频会话吗？

Media.h：

#import <Foundation/Foundation.h>#import <AVFoundation/AVFoundation.h>#import <AudioToolBox/AudioToolBox.h>#define NOT_PLAYING -1@protocol MediaDelegate <NSObject>@optional- (voID) dIDEndplayingAtIndex:(int) index;- (voID) startedtoplayAtIndex:(int) index;- (voID) stoppedtoplayAtIndex:(int) index;- (voID) startedtoplayAtIndex:(int) to fromIndex:(int) from;- (voID) pausedAtIndex:(int) index;@end@interface Media : NSObject <AVAudioSessionDelegate>@property (nonatomic,assign) int currentItem;@property (nonatomic,strong) NSURL *url;@property (nonatomic,strong) AVPlayer *player;@property (nonatomic,assign) ID<MediaDelegate> delegate;- (voID) toggle:(int) index;- (voID) stop;@end

Media.m：

#import "Media.h"@implementation Media@synthesize currentItem;@synthesize player;@synthesize delegate;@synthesize url;- (ID)init{    self = [super init];    if (self) {        NSError *activationError = nil;        NSError *setcategoryError = nil;        AVAudioSession *session = [AVAudioSession sharedInstance];        session.delegate = self;        [session setActive:YES error:&activationError];        [session setcategory:AVAudioSessioncategoryPlayback error:&setcategoryError];        if(activationError || setcategoryError)            NSLog(@"ERROR: %@,%@",activationError,setcategoryError);        self.currentItem = NOT_PLAYING;    }    return self;}- (voID)dealloc{    NSError *activationError = nil;    [[AVAudioSession sharedInstance] setActive:NO error:&activationError];    if(activationError)        NSLog(@"ERROR: %@",activationError);    [self.player removeObserver:self forKeyPath:@"status"];}- (voID)observeValueForKeyPath:(Nsstring *)keyPath ofObject:(ID)object change:(NSDictionary *)change context:(voID *)context{        switch (player.status) {        case AVPlayerItemStatusReadytoplay:            [self.player play];            if([self.delegate respondsToSelector:@selector(startedtoplayAtIndex:)])                [self.delegate startedtoplayAtIndex:self.currentItem];            break;        default:            break;    }}- (voID) toggle:(int) index{    if (self.currentItem == NOT_PLAYING) {        self.player = [AVPlayer playerWithPlayerItem:[AVPlayerItem playerItemWithURL:self.url]];        [[NSNotificationCenter defaultCenter] addobserver:self                                                 selector:@selector(dIDEnd:)                                                     name:AVPlayerItemDidplayToEndTimeNotification                                                    object:self.player];        self.currentItem = index;        [self.player addobserver:self forKeyPath:@"status" options:0 context:nil];    }    else {        if (self.currentItem == index) {            [self.player pause];            if([self.delegate respondsToSelector:@selector(stoppedtoplayAtIndex:)])                [self.delegate stoppedtoplayAtIndex:index];            self.currentItem = NOT_PLAYING;            [self.player removeObserver:self forKeyPath:@"status"];            self.player = nil;            [[NSNotificationCenter defaultCenter] removeObserver:self];        }        else{            [self.player replaceCurrentItemWithPlayerItem:[AVPlayerItem playerItemWithURL:self.url]];            if([self.delegate respondsToSelector:@selector(startedtoplayAtIndex:fromIndex:)])                [self.delegate startedtoplayAtIndex:index fromIndex:self.currentItem];            self.currentItem = index;        }    }}- (voID) stop{    [self.player pause];    if([self.delegate respondsToSelector:@selector(stoppedtoplayAtIndex:)])        [self.delegate stoppedtoplayAtIndex:self.currentItem];}-(voID) dIDEnd:(ID)sender{    if([self.delegate respondsToSelector:@selector(dIDEndplayingAtIndex:)])        [self.delegate dIDEndplayingAtIndex:self.currentItem];    self.currentItem = NOT_PLAYING;    [self.player removeObserver:self forKeyPath:@"status"];    self.player = nil;    [[NSNotificationCenter defaultCenter] removeObserver:self];}#pragma mark - AVAudioSession delegate-(voID)beginInterruption{    NSLog(@"Interruption");    if(self.currentItem != NOT_PLAYING){        [self.player pause];        if([self.delegate respondsToSelector:@selector(pausedAtIndex:)])            [self.delegate pausedAtIndex:self.currentItem];    }}-(voID)endInterruption{    NSLog(@"Ended interruption");    if(self.currentItem != NOT_PLAYING){        [self.player play];        if([self.delegate respondsToSelector:@selector(startedtoplayAtIndex:)])            [self.delegate startedtoplayAtIndex:self.currentItem];    }}@end

解决方法 看起来你有正确的音频路由问题.我建议添加一个音频路由更改侦听器回调.首先声明一个方法：

voID audioRoutechangelistenerCallback(voID *inUserData,AudioSessionPropertyID inPropertyID,UInt32 inPropertyValueSize,const voID *inPropertyValue);

然后在你的init方法中添加一个回调：

// Prevent from audio issues when you pull out earphoneAudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange,audioRoutechangelistenerCallback,(__brIDge voID *)(self));

最后,添加一个回调实现：

voID audioRoutechangelistenerCallback(voID *inUserData,const voID *inPropertyValue) {    if (inPropertyID != kAudioSessionProperty_AudioRouteChange) {        return;    }    CFDictionaryRef routeChangeDictionary = inPropertyValue;    CFNumberRef     routeChangeReasonRef  = CFDictionaryGetValue(routeChangeDictionary,CFSTR(kAudioSession_AudioRouteChangeKey_Reason));    SInt32          routeChangeReason;    CFNumberGetValue(routeChangeReasonRef,kcfNumberSInt32Type,&routeChangeReason);    if (routeChangeReason == kAudioSessionRouteChangeReason_oldDeviceUnavailable) {        // headset is unplugged..        NSLog(@"headset is unplugged..");        // Delayed play: 0.5 s.        dispatch_after(dispatch_time(disPATCH_TIME_Now,0.5f * NSEC_PER_SEC),dispatch_get_main_queue(),^{            [CORE.player play]; // NOTE: change this line according your current player implementation            NSLog(@"resumed play");        });    }    if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) {        // headset is plugged in..        NSLog(@"headset is plugged in..");    }}

希望这有帮助！至少对其他人来说,这将是有用的提示.

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