Iphone iOS、AudioUnits录制到本地URL
在我的iPhone应用程序中，我想录制由我自己的应用程序v.s.内部产生的声音，录制麦克风捕获的外部声音。另一种说法是，我想在播放时直接从声卡上录制声音。我想从那里把新录制的声音文件保存到一个指定的本地URL。发布了一个类似的问题。我已经阅读了一些教程和一些代码，但是有一些事情我需要帮助。这是我的密码： 头文件Iphone iOS、AudioUnits录制到本地URL,iphone,ios,url,audio,audiounit,Iphone,Ios,Url,Audio,Audiounit,在我的iPhone应用程序中，我想录制由我自己的应用程序v.s.内部产生的声音，录制麦克风捕获的外部声音。另一种说法是，我想在播放时直接从声卡上录制声音。我想从那里把新录制的声音文件保存到一个指定的本地URL。发布了一个类似的问题。我已经阅读了一些教程和一些代码，但是有一些事情我需要帮助。这是我的密码： 头文件 OSStatus status; #define kOutputBus 0 #define kInputBus 1 static AudioComponentInstance aud
OSStatus status;
#define kOutputBus 0
#define kInputBus 1
static AudioComponentInstance audioUnit;
static OSStatus recordingCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData) {
// TODO: Use inRefCon to access our interface object to do stuff
// Then, use inNumberFrames to figure out how much data is available, and make
// that much space available in buffers in an AudioBufferList.
AudioBufferList *bufferList; // <- Fill this up with buffers (you will want to malloc it, as it's a dynamic-length list)
// Then:
// Obtain recorded samples
OSStatus status;
status = AudioUnitRender([audioInterface audioUnit],
ioActionFlags,
inTimeStamp,
inBusNumber,
inNumberFrames,
bufferList);
checkStatus(status);
// Now, we have the samples we just read sitting in buffers in bufferList
DoStuffWithTheRecordedAudio(bufferList);
return noErr;
}
static OSStatus playbackCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData) {
// Notes: ioData contains buffers (may be more than one!)
// Fill them up as much as you can. Remember to set the size value in each buffer to match how
// much data is in the buffer.
return noErr;
}
void initializeInternalAudioRecorder() {
AudioStreamBasicDescription audioFormat; //this is currently being called as a local variable, try calling it as a golbal variable if it doesnt work
OSStatus status;
AudioComponentInstance audioUnit;
// Describe audio component
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
// Get component
AudioComponent inputComponent = AudioComponentFindNext(NULL, &desc);
// Get audio units
status = AudioComponentInstanceNew(inputComponent, &audioUnit);
checkStatus(status);
// Enable IO for recording
UInt32 flag = 1;
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus,
&flag,
sizeof(flag));
checkStatus(status);
// Enable IO for playback
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
kOutputBus,
&flag,
sizeof(flag));
checkStatus(status);
// Describe format
audioFormat.mSampleRate = 44100.00;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
// Apply format
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kInputBus,
&audioFormat,
sizeof(audioFormat));
checkStatus(status);
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
kOutputBus,
&audioFormat,
sizeof(audioFormat));
checkStatus(status);
// Set input callback
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Global,
kInputBus,
&callbackStruct,
sizeof(callbackStruct));
checkStatus(status);
// Set output callback
callbackStruct.inputProc = playbackCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Global,
kOutputBus,
&callbackStruct,
sizeof(callbackStruct));
checkStatus(status);
// Disable buffer allocation for the recorder (optional - do this if we want to pass in our own)
flag = 0;
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_ShouldAllocateBuffer,
kAudioUnitScope_Output,
kInputBus,
&flag,
sizeof(flag));
// TODO: Allocate our own buffers if we want
// Initialise
status = AudioUnitInitialize(audioUnit);
checkStatus(status);
}
-(void)startInternalRecorder {
OSStatus status = AudioOutputUnitStart(audioUnit);
checkStatus(status);
}
-(void)stopInternalRecorder {
OSStatus status = AudioOutputUnitStop(audioUnit);
checkStatus(status);
AudioComponentInstanceDispose(audioUnit);
}
OSStatus status;
#define kOutputBus 0
#define kInputBus 1
static AudioComponentInstance audioUnit;
static OSStatus recordingCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData) {
// TODO: Use inRefCon to access our interface object to do stuff
// Then, use inNumberFrames to figure out how much data is available, and make
// that much space available in buffers in an AudioBufferList.
AudioBufferList *bufferList; // <- Fill this up with buffers (you will want to malloc it, as it's a dynamic-length list)
// Then:
// Obtain recorded samples
OSStatus status;
status = AudioUnitRender([audioInterface audioUnit],
ioActionFlags,
inTimeStamp,
inBusNumber,
inNumberFrames,
bufferList);
checkStatus(status);
// Now, we have the samples we just read sitting in buffers in bufferList
DoStuffWithTheRecordedAudio(bufferList);
return noErr;
}
static OSStatus playbackCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData) {
// Notes: ioData contains buffers (may be more than one!)
// Fill them up as much as you can. Remember to set the size value in each buffer to match how
// much data is in the buffer.
return noErr;
}
void initializeInternalAudioRecorder() {
AudioStreamBasicDescription audioFormat; //this is currently being called as a local variable, try calling it as a golbal variable if it doesnt work
OSStatus status;
AudioComponentInstance audioUnit;
// Describe audio component
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
// Get component
AudioComponent inputComponent = AudioComponentFindNext(NULL, &desc);
// Get audio units
status = AudioComponentInstanceNew(inputComponent, &audioUnit);
checkStatus(status);
// Enable IO for recording
UInt32 flag = 1;
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus,
&flag,
sizeof(flag));
checkStatus(status);
// Enable IO for playback
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
kOutputBus,
&flag,
sizeof(flag));
checkStatus(status);
// Describe format
audioFormat.mSampleRate = 44100.00;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
// Apply format
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kInputBus,
&audioFormat,
sizeof(audioFormat));
checkStatus(status);
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
kOutputBus,
&audioFormat,
sizeof(audioFormat));
checkStatus(status);
// Set input callback
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Global,
kInputBus,
&callbackStruct,
sizeof(callbackStruct));
checkStatus(status);
// Set output callback
callbackStruct.inputProc = playbackCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Global,
kOutputBus,
&callbackStruct,
sizeof(callbackStruct));
checkStatus(status);
// Disable buffer allocation for the recorder (optional - do this if we want to pass in our own)
flag = 0;
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_ShouldAllocateBuffer,
kAudioUnitScope_Output,
kInputBus,
&flag,
sizeof(flag));
// TODO: Allocate our own buffers if we want
// Initialise
status = AudioUnitInitialize(audioUnit);
checkStatus(status);
}
-(void)startInternalRecorder {
OSStatus status = AudioOutputUnitStart(audioUnit);
checkStatus(status);
}
-(void)stopInternalRecorder {
OSStatus status = AudioOutputUnitStop(audioUnit);
checkStatus(status);
AudioComponentInstanceDispose(audioUnit);
}
#定义kOutputBus 0
#定义kInputBus 1
静态音频元件；恒定音频单元；
静态OSStatus recordingCallback（在refcon中为void*，
AudioUnitRenderActionFlags*ioActionFlags，
常量音频时间戳*inTimeStamp，
UInt32 InBunsNumber，
UInt32数字帧，
音频缓冲列表*ioData）{
//TODO:使用inRefCon访问我们的接口对象来完成任务
//然后，使用inNumberFrames计算出有多少数据可用，然后
//AudioBufferList中缓冲区中的可用空间。
AudioBufferList*bufferList；//Hmm，您从中复制/粘贴的代码似乎非常不完整。我会小心的。：）此外，您复制/粘贴的代码似乎没有保留其应有的结构
无论如何，audioFormat
应声明为局部变量，其类型为AudioStreamBasicDescription
。代码的顶部（即recordingCallback
函数声明上方的所有内容）它实际上是一个初始化函数，尽管最初的作者对此并没有明确说明。因此，代码需要像这样包装：
void initializeMyStuff() {
// Describe audio component
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
... lots more code ...
// Initialise
status = AudioUnitInitialize(audioUnit);
checkStatus(status);
} // <-- you were missing this end bracket, which caused the compilation errors
static OSStatus recordingCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp, ... etc
void initializeMyStuff（）{
//描述音频组件
音频成分描述描述；
desc.componentType=kAudioUnitType_输出；
…更多的代码。。。
//初始化
状态=AudioUnitInitialize（audioUnit）；
检查状态（状态）；
}//是的，这是有意义的。那么，我如何将通过录制创建的音频文件保存到磁盘上指定的URL？我可以创建URL，使用AVAudioRecorder，我只需使用我想要保存文件的URL初始化录音机，但看起来我无法在这里这样做……因此，如果我声明OSStatus状态，仍然可以；AudioComponentInstance audioUnit；在头文件中，还是我需要在initializeMyStuff（）的顶部声明它们？audioUnit
可能需要是全局的（在这种情况下，它应该在头文件中声明extern
，然后在.c文件的顶部实际声明）.好的，我已经更新了我问题中的代码。我在头文件中声明了audioUnit extern，但我不知道如何在.c文件的顶部声明它。我实际上没有使用c文件。我的所有程序都是Objective-c，除了这部分。在头文件中，您有extern AudioComponentInstance audioUnit；
，并在实现文件的顶部（我想它不必是纯C），您有AudioComponentInstance audioUnit；
。如果这不起作用，请尝试从头文件中删除声明，只需将static AudioComponentInstance audioUnit；
放在实现文件的顶部。根据您下面的评论，听起来您想录制音频并在e设备。这是很自然的，因为API是这样声明的，但在你的问题中，这可能有点误导，因为这意味着你想把它保存在某个服务器上。如果你只想在本地保存文件，AVAudioRecorder
是一种更简单的方法。我只想保存文件ally，但我不能使用AVAudioRecorder的原因是它只能录制外部声音（例如通过麦克风）我想在iPhone上直接从声卡上录制内部声音。例如，如果有人戴着耳机在听什么。我希望能够录制从应用程序播放到耳机的任何声音，而不必摘下耳机。我的错是，我没有足够仔细地阅读你的问题。