我想使用 Core Audio 扩展音频文件服务框架来读取 mp3 文件，将其作为 PCM 进行处理，然后将修改后的文件作为 mp3 文件写回。我能够将 mp3 文件转换为 PCM，但无法将 PCM 文件作为 mp3 写回。
我已经跟踪并分析了 Apple ExtAudioFileConvertTest 示例，但也无法使其正常工作。故障点是当我设置输出文件的客户端格式（设置为规范的 PCM 类型）时。此操作失败并出现错误“fmt？”如果输出目标类型设置为 mp3。
是否可以在 iPhone 上执行 mp3 -> PCM -> mp3？如果我删除失败的行，为输出文件设置 kExtAudioFileProperty_ClientDataFormat，则代码会失败并显示“pkd？”当我稍后尝试写入输出文件时。所以基本上我有两个错误：
1）“fmt？”尝试为输出文件设置 kExtAudioFileProperty_ClientDataFormat 时
2）“PKD？”当尝试写入输出文件时
这是设置文件的代码：
NSURL *fileUrl = [NSURL fileURLWithPath:sourceFilePath];
OSStatus error = noErr;
//
// Open the file
//
error = ExtAudioFileOpenURL((CFURLRef)fileUrl, &sourceFile);
if(error){
NSLog(@"AudioClip: Error opening file at %@. Error code %d", sourceFilePath, error);
return NO;
}
//
// Store the number of frames in the file
//
SInt64 numberOfFrames = 0;
UInt32 propSize = sizeof(SInt64);
error = ExtAudioFileGetProperty(sourceFile, kExtAudioFileProperty_FileLengthFrames, &propSize, &numberOfFrames);
if(error){
NSLog(@"AudioClip: Error retreiving number of frames: %d", error);
[self closeAudioFile];
return NO;
}
frameCount = numberOfFrames;
//
// Get the source file format info
//
propSize = sizeof(sourceFileFormat);
memset(&sourceFileFormat, 0, sizeof(AudioStreamBasicDescription));
error = ExtAudioFileGetProperty(sourceFile, kExtAudioFileProperty_FileDataFormat, &propSize, &sourceFileFormat);
if(error){
NSLog(@"AudioClip: Error getting source audio file properties: %d", error);
[self closeAudioFile];
return NO;
}
//
// Set the format for our read. We read in PCM, clip, then write out mp3
//
memset(&readFileFormat, 0, sizeof(AudioStreamBasicDescription));
readFileFormat.mFormatID = kAudioFormatLinearPCM;
readFileFormat.mSampleRate = 44100;
readFileFormat.mFormatFlags = kAudioFormatFlagsCanonical | kAudioFormatFlagIsNonInterleaved;
readFileFormat.mChannelsPerFrame = 1;
readFileFormat.mBitsPerChannel = 8 * sizeof(AudioSampleType);
readFileFormat.mFramesPerPacket = 1;
readFileFormat.mBytesPerFrame = sizeof(AudioSampleType);
readFileFormat.mBytesPerPacket = sizeof(AudioSampleType);
readFileFormat.mReserved = 0;
propSize = sizeof(readFileFormat);
error = ExtAudioFileSetProperty(sourceFile, kExtAudioFileProperty_ClientDataFormat, propSize, &readFileFormat);
if(error){
NSLog(@"AudioClip: Error setting read format: %d", error);
[self closeAudioFile];
return NO;
}
//
// Set the format for the output file that we will write
//
propSize = sizeof(targetFileFormat);
memset(&targetFileFormat, 0, sizeof(AudioStreamBasicDescription));
targetFileFormat.mFormatID = kAudioFormatMPEGLayer3;
targetFileFormat.mChannelsPerFrame = 1;
//
// Let the API fill in the rest
//
error = AudioFormatGetProperty(kAudioFormatProperty_FormatInfo, 0, NULL, &propSize, &targetFileFormat);
if(error){
NSLog(@"AudioClip: Error getting target file format info: %d", error);
[self closeAudioFile];
return NO;
}
//
// Create our target file
//
NSURL *writeURL = [NSURL fileURLWithPath:targetFilePath];
error = ExtAudioFileCreateWithURL( (CFURLRef)writeURL, kAudioFileMP3Type,
&targetFileFormat, NULL,
kAudioFileFlags_EraseFile,
&targetFile);
if(error){
NSLog(@"AudioClip: Error opening target file for writing: %d", error);
[self closeAudioFile];
return NO;
}
//
// Set the client format for the output file the same as our client format for the input file
//
propSize = sizeof(readFileFormat);
error = ExtAudioFileSetProperty(targetFile, kExtAudioFileProperty_ClientDataFormat, propSize, &readFileFormat);
if(error){
NSLog(@"AudioClip: Error, cannot set client format for output file: %d", error);
[self closeAudioFile];
return NO;
}
以及读取/写入的代码：
NSInteger framesToRead = finalFrameNumber - startFrameNumber;
while(framesToRead > 0){
//
// Read frames into our data
//
short *data = (short *)malloc(framesToRead * sizeof(short));
if(!data){
NSLog(@"AudioPlayer: Cannot init memory for read buffer");
[self notifyDelegateFailure];
[self closeAudioFile];
return;
}
AudioBufferList bufferList;
OSStatus error = noErr;
UInt32 loadedPackets = framesToRead;
bufferList.mNumberBuffers = 1;
bufferList.mBuffers[0].mNumberChannels = 1;
bufferList.mBuffers[0].mData = data;
bufferList.mBuffers[0].mDataByteSize = (framesToRead * sizeof(short));
NSLog(@"AudioClip: Before read nNumberBuffers = %d, mNumberChannels = %d, mData = %p, mDataByteSize = %d",
bufferList.mNumberBuffers, bufferList.mBuffers[0].mNumberChannels, bufferList.mBuffers[0].mData,
bufferList.mBuffers[0].mDataByteSize);
error = ExtAudioFileRead(sourceFile, &loadedPackets, &bufferList);
if(error){
NSLog(@"AudioClip: Error %d from ExtAudioFileRead", error);
[self notifyDelegateFailure];
[self closeAudioFile];
return;
}
//
// Now write the data to our file which will convert it into a mp3 file
//
NSLog(@"AudioClip: After read nNumberBuffers = %d, mNumberChannels = %d, mData = %p, mDataByteSize = %d",
bufferList.mNumberBuffers, bufferList.mBuffers[0].mNumberChannels, bufferList.mBuffers[0].mData,
bufferList.mBuffers[0].mDataByteSize);
error = ExtAudioFileWrite(targetFile, loadedPackets, &bufferList);
if(error){
NSLog(@"AudioClip: Error %d from ExtAudioFileWrite", error);
[self notifyDelegateFailure];
[self closeAudioFile];
return;
}
framesToRead -= loadedPackets;
}
