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POHow to write audio file locally recorded from microphone using AudioBuffer in iPhone?
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copied!<p>I am new to Audio framework, anyone help me to write the audio file which is playing by capturing from microphone?</p> <p>below is the code to play mic input through iphone speaker, now i would like to save the audio in iphone for future use.</p> <p>i found the code from here to record audio using microphone <a href="http://www.stefanpopp.de/2011/capture-iphone-microphone/" rel="nofollow">http://www.stefanpopp.de/2011/capture-iphone-microphone/</a></p> <pre><code>/** Code start from here for playing the recorded voice */ static OSStatus playbackCallback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) { /** This is the reference to the object who owns the callback. */ AudioProcessor *audioProcessor = (AudioProcessor*) inRefCon; // iterate over incoming stream an copy to output stream for (int i=0; i < ioData->mNumberBuffers; i++) { AudioBuffer buffer = ioData->mBuffers[i]; // find minimum size UInt32 size = min(buffer.mDataByteSize, [audioProcessor audioBuffer].mDataByteSize); // copy buffer to audio buffer which gets played after function return memcpy(buffer.mData, [audioProcessor audioBuffer].mData, size); // set data size buffer.mDataByteSize = size; // get a pointer to the recorder struct variable Recorder recInfo = audioProcessor.audioRecorder; // write the bytes OSStatus audioErr = noErr; if (recInfo.running) { audioErr = AudioFileWriteBytes (recInfo.recordFile, false, recInfo.inStartingByte, &size, &buffer.mData); assert (audioErr == noErr); // increment our byte count recInfo.inStartingByte += (SInt64)size;// size should be number of bytes audioProcessor.audioRecorder = recInfo; } } return noErr; } </code></pre> <p>-(void)prepareAudioFileToRecord{</p> <pre><code>NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; NSTimeInterval time = ([[NSDate date] timeIntervalSince1970]); // returned as a double long digits = (long)time; // this is the first 10 digits int decimalDigits = (int)(fmod(time, 1) * 1000); // this will get the 3 missing digits // long timestamp = (digits * 1000) + decimalDigits; NSString *timeStampValue = [NSString stringWithFormat:@"%ld",digits]; // NSString *timeStampValue = [NSString stringWithFormat:@"%ld.%d",digits ,decimalDigits]; NSString *fileName = [NSString stringWithFormat:@"test%@.caf",timeStampValue]; NSString *filePath = [basePath stringByAppendingPathComponent:fileName]; NSURL *fileURL = [NSURL fileURLWithPath:filePath]; // modify the ASBD (see EDIT: towards the end of this post!) audioFormat.mFormatFlags = kAudioFormatFlagIsBigEndian | kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; // set up the file (bridge cast will differ if using ARC) OSStatus audioErr = noErr; audioErr = AudioFileCreateWithURL((CFURLRef)fileURL, kAudioFileCAFType, &audioFormat, kAudioFileFlags_EraseFile, &audioRecorder.recordFile); assert (audioErr == noErr);// simple error checking audioRecorder.inStartingByte = 0; audioRecorder.running = true; self.audioRecorder = audioRecorder; </code></pre> <p>}</p> <p>thanks in advance bala</p>

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