concat两个音频文件一个接一个ios

概述我想将两个音频文件连接成一个.我做了以下代码.请检查下面. - (BOOL)combineFiles{ AVMutableComposition *composition = [[AVMutableComposition alloc] init]; AVMutableCompositionTrack *compositionAudioTrack = [composition ad 我想将两个音频文件连接成一个.我做了以下代码.请检查下面.

- (BOol)combinefiles{    AVMutableComposition *composition = [[AVMutableComposition alloc] init];    AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_InvalID];    [compositionAudioTrack setPreferredVolume:0.8];    Nsstring *soundOne  =[[NSBundle mainBundle]pathForResource:@"test1" ofType:@"m4a"];    NSURL *url = [NSURL fileURLWithPath:soundOne];    AVAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];    AVAssetTrack *clipAudioTrack = [[avAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];    [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,avAsset.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];    AVMutableCompositionTrack *compositionAudioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_InvalID];    [compositionAudioTrack1 setPreferredVolume:0.8];    Nsstring *soundOne1  =[[NSBundle mainBundle]pathForResource:@"test2" ofType:@"m4a"];    NSURL *url1 = [NSURL fileURLWithPath:soundOne1];    AVAsset *avAsset1 = [AVURLAsset URLAssetWithURL:url1 options:nil];    AVAssetTrack *clipAudioTrack1 = [[avAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];    [compositionAudioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero,avAsset.duration) ofTrack:clipAudioTrack1 atTime:kCMTimeZero error:nil];    AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:composition presetname:AVAssetExportPresetAppleM4A];    if (nil == exportSession) return NO;    exportSession.outputURL = [NSURL fileURLWithPath:[@"test3.m4a" documentDirectory]]; // output path    exportSession.outputfileType = AVfileTypeAppleM4A; // output file type    // perform the export    [exportSession exportAsynchronouslyWithCompletionHandler:^{        if (AVAssetExportSessionStatusCompleted == exportSession.status) {            NSLog(@"AVAssetExportSessionStatusCompleted");        } else if (AVAssetExportSessionStatusFailed == exportSession.status) {            NSLog(@"AVAssetExportSessionStatusFailed");        } else {            NSLog(@"Export Session Status: %ld",(long)exportSession.status);        }    }];    return YES;}

从上面的代码我们可以将两个音频文件合并为一个,其中两个文件同时播放.但我希望第三个文件一个接一个地播放前两个文件.

请帮我解决这个问题.

解决方法 做了很多研究后我找到了答案..它有效..

- (voID)mergeTwoAudiofiles{    AVAsset *avAsset1 = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test1" ofType:@"m4a"]] options:nil];    AVAsset *avAsset2 = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test2" ofType:@"m4a"]] options:nil];    AVMutableComposition *composition = [[AVMutableComposition alloc] init];    [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_InvalID];    AVMutableCompositionTrack *track = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_InvalID];    AVAssetTrack *assetTrack1 = [[avAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];    AVAssetTrack *assetTrack2 = [[avAsset2 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];    CMTime insertionPoint = kCMTimeZero;    [track insertTimeRange:CMTimeRangeMake(kCMTimeZero,avAsset1.duration) ofTrack:assetTrack1 atTime:insertionPoint error:nil];    insertionPoint = CMTimeAdd(insertionPoint,avAsset1.duration);    [track insertTimeRange:CMTimeRangeMake(kCMTimeZero,avAsset2.duration) ofTrack:assetTrack2 atTime:insertionPoint error:nil];    AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:composition presetname:AVAssetExportPresetAppleM4A];    exportSession.outputURL = [NSURL fileURLWithPath:[@"test3.m4a" documentDirectory]];    exportSession.outputfileType = AVfileTypeAppleM4A;    [exportSession exportAsynchronouslyWithCompletionHandler:^{        if (AVAssetExportSessionStatusCompleted == exportSession.status) {            NSLog(@"AVAssetExportSessionStatusCompleted");        } else if (AVAssetExportSessionStatusFailed == exportSession.status) {            NSLog(@"AVAssetExportSessionStatusFailed");        } else {            NSLog(@"Export Session Status: %ld",(long)exportSession.status);        }    }];}

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