iOS 将.caf文件转换为.aac文件

左手的ㄟ右手 2022-04-11 03:07 239阅读 0赞

How to convert .caf audio files into .aac?

step 1) I have downloaded sample TPAACAudioConverter project from [https://github.com/michaeltyson/TPAACAudioConverter][https_github.com_michaeltyson_TPAACAudioConverter]  
从github下载这个项目。

step 2)AACConverterViewController.m

i have set source file and destination file format  
进入AACConverterViewController.m，将里面的m4a改为aac

- (IBAction)convert:(id)sender {
    .........
    
    NSArray *documentsFolders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    audioConverter = [[[TPAACAudioConverter alloc] initWithDelegate:self 
                                                             source:[[NSBundle mainBundle] pathForResource:@"audio" ofType:@"aiff"]
                                                        destination:[[documentsFolders objectAtIndex:0] stringByAppendingPathComponent:@"audio.aac"]] autorelease]; //将原来的m4a改为aac
    ((UIButton*)sender).enabled = NO;
    [self.spinner startAnimating];
    self.progressView.progress = 0.0;
    self.progressView.hidden = NO;
    
    [audioConverter start];
    }

play converted audio

- (IBAction)playConverted:(id)sender {
    if ( audioPlayer ) {
        [audioPlayer stop];
        [audioPlayer release];
        audioPlayer = nil;
        [(UIButton*)sender setTitle:@"Play converted" forState:UIControlStateNormal];
    } else {
        NSArray *documentsFolders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *path = [[documentsFolders objectAtIndex:0] stringByAppendingPathComponent:@"audio.aac"]; //将m4a改为aac
        audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
        [audioPlayer play];
    
        [(UIButton*)sender setTitle:@"Stop" forState:UIControlStateNormal];
    }
    }

step 3)TPAACAudioConverter.m  
simply i have changed audio file type find and replace **kAudioFileM4AType** into **kAudioFileAAC\_ADTSType**

进入TPAACAudioConverter.m文件，搜索kAudioFileM4AType，将kAudioFileM4AType改为kAudioFileAAC\_ADTSType

答案来自于[Stack Overflow][]

## 其实关键的部分是第三步，转码用的文件只是TPAACAudioConverter.h和TPAACAudioConverter.m ##

[https_github.com_michaeltyson_TPAACAudioConverter]: https://github.com/michaeltyson/TPAACAudioConverter
[Stack Overflow]: https://stackoverflow.com/questions/18801015/iphone-how-to-convert-caf-audio-files-into-aac