# I amtrying to implement real-time streaming of voice i.e., here we need to records voice as small chunks# I tried to implement this using AudioQueue concept in Objective-C.# But , the app crashes when trying to record the voice. It crashes when callback method is called for recording.# I have attached sample code snippet which I’ve used for implementation. Please help me in resolving the issue- (void)startRecording { [self setupAudioFormat:&recordState.dataFormat]; recordState.currentPacket = 0; OSStatus status; status = AudioQueueNewInput(&recordState.dataFormat, AudioInputCallback, &recordState, CFRunLoopGetCurrent(), kCFRunLoopCommonModes, 0, &recordState.queue); if (status == 0) { // Prime recording buffers with empty data for (int i = 0; i < NUM_BUFFERS; i++) { AudioQueueAllocateBuffer(recordState.queue, 16000, &recordState.buffers[i]); AudioQueueEnqueueBuffer (recordState.queue, recordState.buffers[i], 0, NULL); } status = AudioFileCreateWithURL(fileURL, kAudioFileAIFFType, &recordState.dataFormat, kAudioFileFlags_EraseFile, &recordState.audioFile); if (status == 0) { recordState.recording = true; status = AudioQueueStart(recordState.queue, NULL); if (status == 0) { //labelStatus.text = @"Recording"; } } } if (status != 0) { [self stopRecording]; //labelStatus.text = @"Record Failed"; } } void AudioInputCallback(void * inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer, const AudioTimeStamp * inStartTime, UInt32 inNumberPacketDescriptions, const AudioStreamPacketDescription * inPacketDescs) { RecordState * recordState = (RecordState*)inUserData; if (!recordState->recording) { printf("Not recording, returning\n"); } // if (inNumberPacketDescriptions == 0 && recordState->dataFormat.mBytesPerPacket != 0) // { // inNumberPacketDescriptions = inBuffer->mAudioDataByteSize / recordState->dataFormat.mBytesPerPacket; // } printf("Writing buffer %lld\n", recordState->currentPacket); OSStatus status = AudioFileWritePackets(recordState->audioFile, false, inBuffer->mAudioDataByteSize, inPacketDescs, recordState->currentPacket, &inNumberPacketDescriptions, inBuffer->mAudioData); if (status == 0) { recordState->currentPacket += inNumberPacketDescriptions; } AudioQueueEnqueueBuffer(recordState->queue, inBuffer, 0, NULL); } -void)setupAudioFormat:(AudioStreamBasicDescription*)format { format->mSampleRate = 8000.0; format->mFormatID = kAudioFormatLinearPCM; format->mFramesPerPacket = 1; format->mChannelsPerFrame = 1; format->mBytesPerFrame = 2; format->mBytesPerPacket = 2; format->mBitsPerChannel = 16; format->mReserved = 0; format->mFormatFlags = kLinearPCMFormatFlagIsBigEndian | kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked; }