在iPhone中创建虚拟音频文件

Question

I woud like to programatically create and save to disk a dummy audio file to use in unit tests involving AVAudioPlayer .

What's the simplest way to do this in iOS?

Answer 1

You can either record some random noise for some duration using AVAudioRecord.

Alternatively, you can create one wave file from scratch using details given in following link : http://www.iphonedevsdk.com/forum/iphone-sdk-development/45613-creating-audio-programmatically.html

Answer 2

A colleague suggested an alternative solution: create the smallest audio file possible with Audacitiy , get its bytes, and copy them into the code.

This is the result:

const char bytes[] = {0x52, 0x49, 0x46, 0x46, 0x26, 0x0, 0x0, 0x0, 0x57, 0x41, 0x56, 0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x0, 0x0, 0x0, 0x1, 0x0, 0x1, 0x0, 0x44, 0xac, 0x0, 0x0, 0x88, 0x58, 0x1, 0x0, 0x2, 0x0, 0x10, 0x0, 0x64, 0x61, 0x74, 0x61, 0x2, 0x0, 0x0, 0x0, 0xfc, 0xff};
NSData* data = [NSData dataWithBytes:bytes length:sizeof(bytes)];
NSString* filePath = [path_ stringByAppendingPathComponent:@"test.wav"];
[data writeToFile:filePath atomically:YES];
audioURL_ = [NSURL fileURLWithPath:filePath];