在iOS中同时录制和播放audio
我正试图在录制的同时播放录制的内容。 目前我正在使用AVAudioRecorder进行录制， AVAudioPlayer进行播放。
当我试图同时播放内容时，没有任何东西在播放。 请find我正在做的伪代码。
如果我停止录音后一切正常，一切正常。
AVAudioRecorder *recorder; //Initializing the recorder properly. [recorder record]; NSError *error=nil; NSUrl recordingPathUrl; //Contains the recording path. AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordingPathUrl error:&error]; [audioPlayer prepareToPlay]; [audioPlayer play];
你能请任何人让我知道你的想法或想法？
这是可以实现的，使用这些链接并下载它： https : //code.google.com/p/ios-coreaudio-example/downloads/detail?name=Aruts.zip&can=2&q=
这个链接将播放扬声器的声音，但不会logging它，我已经实现了loggingfunction以下是完整的代码说明..
IN .h文件
#import <Foundation/Foundation.h> #import <AudioToolbox/AudioToolbox.h> #ifndef max #define max( a, b ) ( ((a) > (b)) ? (a) : (b) ) #endif #ifndef min #define min( a, b ) ( ((a) < (b)) ? (a) : (b) ) #endif @interface IosAudioController : NSObject { AudioComponentInstance audioUnit; AudioBuffer tempBuffer; // this will hold the latest data from the microphone ExtAudioFileRef mAudioFileRef; } @property (readonly)ExtAudioFileRef mAudioFileRef; @property (readonly) AudioComponentInstance audioUnit; @property (readonly) AudioBuffer tempBuffer; - (void) start; - (void) stop; - (void) processAudio: (AudioBufferList*) bufferList; @end // setup a global iosAudio variable, accessible everywhere extern IosAudioController* iosAudio;
IN .m
#import "IosAudioController.h" #import <AudioToolbox/AudioToolbox.h> #import <AVFoundation/AVFoundation.h> #define kOutputBus 0 #define kInputBus 1 IosAudioController* iosAudio; void checkStatus(int status){ if (status) { printf("Status not 0! %d\n", status); // exit(1); } } static void printAudioUnitRenderActionFlags(AudioUnitRenderActionFlags * ioActionFlags) { if (*ioActionFlags == 0) { printf("AudioUnitRenderActionFlags(%lu) ", *ioActionFlags); return; } printf("AudioUnitRenderActionFlags(%lu): ", *ioActionFlags); if (*ioActionFlags & kAudioUnitRenderAction_PreRender) printf("kAudioUnitRenderAction_PreRender "); if (*ioActionFlags & kAudioUnitRenderAction_PostRender) printf("kAudioUnitRenderAction_PostRender "); if (*ioActionFlags & kAudioUnitRenderAction_OutputIsSilence) printf("kAudioUnitRenderAction_OutputIsSilence "); if (*ioActionFlags & kAudioOfflineUnitRenderAction_Preflight) printf("kAudioOfflineUnitRenderAction_Prefli ght "); if (*ioActionFlags & kAudioOfflineUnitRenderAction_Render) printf("kAudioOfflineUnitRenderAction_Render"); if (*ioActionFlags & kAudioOfflineUnitRenderAction_Complete) printf("kAudioOfflineUnitRenderAction_Complete "); if (*ioActionFlags & kAudioUnitRenderAction_PostRenderError) printf("kAudioUnitRenderAction_PostRenderError "); if (*ioActionFlags & kAudioUnitRenderAction_DoNotCheckRenderArgs) printf("kAudioUnitRenderAction_DoNotCheckRenderArgs "); } /** This callback is called when new audio data from the microphone is available. */ static OSStatus recordingCallback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) { double timeInSeconds = inTimeStamp->mSampleTime / 44100.00; printf("\n%fs inBusNumber: %lu inNumberFrames: %lu ", timeInSeconds, inBusNumber, inNumberFrames); printAudioUnitRenderActionFlags(ioActionFlags); // Because of the way our audio format (setup below) is chosen: // we only need 1 buffer, since it is mono // Samples are 16 bits = 2 bytes. // 1 frame includes only 1 sample AudioBuffer buffer; buffer.mNumberChannels = 1; buffer.mDataByteSize = inNumberFrames * 2; buffer.mData = malloc( inNumberFrames * 2 ); // Put buffer in a AudioBufferList AudioBufferList bufferList; SInt16 samples[inNumberFrames]; // A large enough size to not have to worry about buffer overrun memset (&samples, 0, sizeof (samples)); bufferList.mNumberBuffers = 1; bufferList.mBuffers[0] = buffer; // Then: // Obtain recorded samples OSStatus status; status = AudioUnitRender([iosAudio audioUnit], ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, &bufferList); checkStatus(status); // Now, we have the samples we just read sitting in buffers in bufferList // Process the new data [iosAudio processAudio:&bufferList]; // Now, we have the samples we just read sitting in buffers in bufferList ExtAudioFileWriteAsync([iosAudio mAudioFileRef], inNumberFrames, &bufferList); // release the malloc'ed data in the buffer we created earlier free(bufferList.mBuffers[0].mData); return noErr; } /** This callback is called when the audioUnit needs new data to play through the speakers. If you don't have any, just don't write anything in the buffers */ 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. for (int i=0; i < ioData->mNumberBuffers; i++) { // in practice we will only ever have 1 buffer, since audio format is mono AudioBuffer buffer = ioData->mBuffers[i]; // NSLog(@" Buffer %d has %d channels and wants %d bytes of data.", i, buffer.mNumberChannels, buffer.mDataByteSize); // copy temporary buffer data to output buffer UInt32 size = min(buffer.mDataByteSize, [iosAudio tempBuffer].mDataByteSize); // dont copy more data then we have, or then fits memcpy(buffer.mData, [iosAudio tempBuffer].mData, size); buffer.mDataByteSize = size; // indicate how much data we wrote in the buffer // uncomment to hear random noise /* UInt16 *frameBuffer = buffer.mData; for (int j = 0; j < inNumberFrames; j++) { frameBuffer[j] = rand(); } */ } return noErr; } @implementation IosAudioController @synthesize audioUnit, tempBuffer,mAudioFileRef; /** Initialize the audioUnit and allocate our own temporary buffer. The temporary buffer will hold the latest data coming in from the microphone, and will be copied to the output when this is requested. */ - (id) init { self = [super init]; OSStatus status; AVAudioSession *session = [AVAudioSession sharedInstance]; NSLog(@"%f",session.preferredIOBufferDuration); // 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 AudioStreamBasicDescription audioFormat; 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)); // set preferred buffer size Float32 audioBufferSize = (0.023220); UInt32 size = sizeof(audioBufferSize); status = AudioSessionSetProperty(kAudioSessionProperty_PreferredHardwareIOBufferDuration, size, &audioBufferSize); // Allocate our own buffers (1 channel, 16 bits per sample, thus 16 bits per frame, thus 2 bytes per frame). // Practice learns the buffers used contain 512 frames, if this changes it will be fixed in processAudio. tempBuffer.mNumberChannels = 1; tempBuffer.mDataByteSize = 512 * 2; tempBuffer.mData = malloc( 512 * 2 ); NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *destinationFilePath = [[NSString alloc] initWithFormat: @"%@/output.caf", documentsDirectory]; NSLog(@">>> %@\n", destinationFilePath); CFURLRef destinationURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, ( CFStringRef)destinationFilePath, kCFURLPOSIXPathStyle, false); OSStatus setupErr = ExtAudioFileCreateWithURL(destinationURL, kAudioFileCAFType, &audioFormat, NULL, kAudioFileFlags_EraseFile, &mAudioFileRef); CFRelease(destinationURL); NSAssert(setupErr == noErr, @"Couldn't create file for writing"); setupErr = ExtAudioFileSetProperty(mAudioFileRef, kExtAudioFileProperty_ClientDataFormat, sizeof(AudioStreamBasicDescription), &audioFormat); NSAssert(setupErr == noErr, @"Couldn't create file for format"); setupErr = ExtAudioFileWriteAsync(mAudioFileRef, 0, NULL); NSAssert(setupErr == noErr, @"Couldn't initialize write buffers for audio file"); // Initialise status = AudioUnitInitialize(audioUnit); checkStatus(status); // [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(stopRecording:) userInfo:nil repeats:NO]; return self; } /** Start the audioUnit. This means data will be provided from the microphone, and requested for feeding to the speakers, by use of the provided callbacks. */ - (void) start { OSStatus status = AudioOutputUnitStart(audioUnit); checkStatus(status); } /** Stop the audioUnit */ - (void) stop { OSStatus status = AudioOutputUnitStop(audioUnit); checkStatus(status); [self stopRecording:nil]; } /** Change this function to decide what is done with incoming audio data from the microphone. Right now we copy it to our own temporary buffer. */ - (void) processAudio: (AudioBufferList*) bufferList{ AudioBuffer sourceBuffer = bufferList->mBuffers[0]; // fix tempBuffer size if it's the wrong size if (tempBuffer.mDataByteSize != sourceBuffer.mDataByteSize) { free(tempBuffer.mData); tempBuffer.mDataByteSize = sourceBuffer.mDataByteSize; tempBuffer.mData = malloc(sourceBuffer.mDataByteSize); } // copy incoming audio data to temporary buffer memcpy(tempBuffer.mData, bufferList->mBuffers[0].mData, bufferList->mBuffers[0].mDataByteSize); } - (void)stopRecording:(NSTimer*)theTimer { printf("\nstopRecording\n"); OSStatus status = ExtAudioFileDispose(mAudioFileRef); printf("OSStatus(ExtAudioFileDispose): %ld\n", status); } /** Clean up. */ - (void) dealloc { [super dealloc]; AudioUnitUninitialize(audioUnit); free(tempBuffer.mData); }
这一定会帮助你的人..
做这个的另一个最好的方法是从https://github.com/tkzic/audiograph下载audio触摸，并看到这个应用程序的回声function它重复声音，当你说话，但它不loggingaudio，所以添加录音function，如下所述：
IN MixerHostAudio.h @property (readwrite) ExtAudioFileRef mRecordFile; -(void)Record; -(void)StopRecord; IN MixerHostAudio.m
//在这个类中添加这两个函数
-(void)Record{ NSString *completeFileNameAndPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingString:@"/Record.wav"]; //create the url that the recording object needs to reference the file CFURLRef audioFileURL = CFURLCreateFromFileSystemRepresentation (NULL, (const UInt8 *)[completeFileNameAndPath cStringUsingEncoding:[NSString defaultCStringEncoding]] , strlen([completeFileNameAndPath cStringUsingEncoding:[NSString defaultCStringEncoding]]), false); AudioStreamBasicDescription dstFormat, clientFormat; memset(&dstFormat, 0, sizeof(dstFormat)); memset(&clientFormat, 0, sizeof(clientFormat)); AudioFileTypeID fileTypeId = kAudioFileWAVEType; UInt32 size = sizeof(dstFormat); dstFormat.mFormatID = kAudioFormatLinearPCM; // setup the output file format dstFormat.mSampleRate = 44100.0; // set sample rate // create a 16-bit 44100kHz Stereo format dstFormat.mChannelsPerFrame = 2; dstFormat.mBitsPerChannel = 16; dstFormat.mBytesPerPacket = dstFormat.mBytesPerFrame = 4; dstFormat.mFramesPerPacket = 1; dstFormat.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger; // little-endian //get the client format directly from UInt32 asbdSize = sizeof (AudioStreamBasicDescription); AudioUnitGetProperty(mixerUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, // input bus &clientFormat, &asbdSize); ExtAudioFileCreateWithURL(audioFileURL, fileTypeId, &dstFormat, NULL, kAudioFileFlags_EraseFile, &mRecordFile); printf("recording\n"); ExtAudioFileSetProperty(mRecordFile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat); //call this once as this will alloc space on the first call ExtAudioFileWriteAsync(mRecordFile, 0, NULL); } -(void)StopRecord{ ExtAudioFileDispose(mRecordFile); } //In micLineInCallback function Add this line at last before return noErr; : ExtAudioFileWriteAsync([THIS mRecordFile] , inNumberFrames, ioData);
并从 – （IBAction）中的MixerHostViewController.m中调用这些函数playOrStop：（id）sender方法
如果要实时监控audioinput，则需要使用AudioUnits。
- 苹果的audio单元主机指南
- 有关configuration远程I / Oaudio单元的教程
RemoteIOaudio单元可用于同时录制和播放。 有很多使用RemoteIO（aurioTouch）进行录制和使用RemoteIO进行播放的示例。 只需启用单位input和单位输出，并处理两个缓冲区callback。 在这里看到一个例子