iOS Swift – 将.wav文件合并并转换为.mp3

我想要将两个或更多的.wav文件合并到一个文件中,然后将其转换为.mp3,我想在 Swift中完成(或者至少有选项将其包含在swift项目中).

在swift中合并两个.wav文件是没有问题的. Here is my example现在我不知道如何添加lame库来快速的项目以及如何使用它(如何改变客观的c跛脚代码使用语法,以便在swift中使用它).

我坚持在迅速,所以我尝试Lame库与Objective C.我找到了将.caf转换为.mp3的示例代码,所以我试过了.这是我试过的：

- (void) toMp3
{
    Nsstring *cafFilePath = [[NSBundle mainBundle] pathForResource:@"sound" ofType:@"caf"];

    Nsstring *mp3FileName = @"Mp3File";
    mp3FileName = [mp3FileName stringByAppendingString:@".mp3"];
    Nsstring *mp3FilePath = [[NSHomeDirectory() stringByAppendingFormat:@"/Documents/"] stringByAppendingPathComponent:mp3FileName];

    NSLog(@"%@",mp3FilePath);

    @try {
        int read,write;

        FILE *pcm = fopen([cafFilePath cStringUsingEncoding:1],"rb");  //source
        fseek(pcm,4*1024,SEEK_CUR);                                   //skip file header
        FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:1],"wb");  //output

        const int PCM_SIZE = 8192;
        const int MP3_SIZE = 8192;
        short int pcm_buffer[PCM_SIZE*2];
        unsigned char mp3_buffer[MP3_SIZE];

        lame_t lame = lame_init();
        lame_set_in_samplerate(lame,44100);
        lame_set_VBR(lame,vbr_default);
        lame_init_params(lame);

        do {
            read = fread(pcm_buffer,2*sizeof(short int),PCM_SIZE,pcm);
            if (read == 0)
                write = lame_encode_flush(lame,mp3_buffer,MP3_SIZE);
            else
                write = lame_encode_buffer_interleaved(lame,pcm_buffer,read,MP3_SIZE);

            fwrite(mp3_buffer,write,1,mp3);

        } while (read != 0);

        lame_close(lame);
        fclose(mp3);
        fclose(pcm);
    }
    @catch (NSException *exception) {
        NSLog(@"%@",[exception description]);
    }
    @finally {
        [self performSelectorOnMainThread:@selector(convertMp3Finish)
                               withObject:nil
                            waitUntilDone:YES];
    }
}

- (void) convertMp3Finish
{
}

但是这样做的结果只是带有噪音的.mp3.

> Here is example .caf file.
> And here is result .mp3 file.

所以我需要修复我的三个问题：

>在Objective C中从caf创建正确的mp3
>更改代码以将其用于wav文件
>并将其更改为能够在Swift中使用它

我知道iOS中编码和转换mp3有很多问题,但是我找不到Swift的例子,我找不到工作Objective C代码的例子(只是上面的代码).感谢帮助

解决方法

我们有专门的类来从/ AVAssetReader和AVAssetWriter的文件读取/写入媒体,并借助AVAssetExportSession可以将其导出为mp3文件.
否则你可以使用 https://github.com/michaeltyson/TPAACAudioConverter