如何追加两个音频文件？ [英] How to append two audio files?

问题描述

我要追加在iPhone两个音频文件。请帮我做到这一点。

I want to append two audio files in iPhone. Please help me to do this.

推荐答案

我得到了解决;以下是示例code做到这一点。

I got the solution; Following is the sample code to do it.

AVMutableComposition* composition = [AVMutableComposition composition];
AVURLAsset* audioAsset1 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:filePath1] options:nil];
AVURLAsset* audioAsset2 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:filePath2] options:nil];

AVMutableCompositionTrack *audioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio 
                                                                      preferredTrackID:kCMPersistentTrackID_Invalid];

[audioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset1.duration)
                         ofTrack:[[audioAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]
                          atTime:kCMTimeZero
                           error:&error];
[audioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset2.duration) 
                         ofTrack:[[audioAsset2 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
                          atTime:audioAsset1.duration
                           error:&error];

最后，我们用它导出为一个单一的文件 AVAssetExportSession 。

注意：这将只对文件的.m4a

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