Sun Limited Mt.

Audio Queue を使用してマイクからの音を録音する方法です。
AudioRecorder というクラスを作成して、hoge.aiff というファイルに保存します。
シュミレータでも Mac にマイクが付いていれば録音できます。

AudioRecorder.h

#import <Foundation/Foundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import <AudioToolbox/AudioFile.h>

#define NUM_BUFFERS 3
#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]

@interface AudioRecorder : NSObject {
  AudioFileID audioFile;
  AudioStreamBasicDescription dataFormat;
  AudioQueueRef queue;
  AudioQueueBufferRef buffers[NUM_BUFFERS];
  CFURLRef fileURL;
  SInt64 currentPacket;
  BOOL isRecording;
}

@property AudioQueueRef queue;
@property SInt64 currentPacket;
@property AudioFileID audioFile;
@property BOOL isRecording;

- (id) init;
- (void) record;
- (void) stop;

static void AudioInputCallback(
  void* inUserData,
  AudioQueueRef inAQ,
  AudioQueueBufferRef inBuffer,
  const AudioTimeStamp *inStartTime,
  UInt32 inNumberPacketDescriptions,
  const AudioStreamPacketDescription *inPacketDescs
);

AudioRecorder.m

#import "AudioRecorder.h"

@implementation AudioRecorder

@synthesize queue, currentPacket, audioFile, isRecording;

static void AudioInputCallback(
  void* inUserData,
  AudioQueueRef inAQ,
  AudioQueueBufferRef inBuffer,
  const AudioTimeStamp *inStartTime,
  UInt32 inNumberPacketDescriptions,
  const AudioStreamPacketDescription *inPacketDescs)
{
  AudioRecorder* recorder = (AudioRecorder*) inUserData;

  OSStatus status = AudioFileWritePackets(
    recorder.audioFile,
    NO,
    inBuffer->mAudioDataByteSize,
    inPacketDescs,
    recorder.currentPacket,
    &inNumberPacketDescriptions,
    inBuffer->mAudioData);

  if (status == noErr) {
    recorder.currentPacket += inNumberPacketDescriptions;
    AudioQueueEnqueueBuffer(recorder.queue,inBuffer,0,nil);
  }
}

-(id) init
{
  isRecording = NO;
  dataFormat.mSampleRate = 44100.0f;
  dataFormat.mFormatID = kAudioFormatLinearPCM;
  dataFormat.mFramesPerPacket = 1;
  dataFormat.mChannelsPerFrame = 1;
  dataFormat.mBytesPerFrame = 2;
  dataFormat.mBytesPerPacket = 2;
  dataFormat.mBitsPerChannel = 16;
  dataFormat.mReserved = 0;
  dataFormat.mFormatFlags =
    kLinearPCMFormatFlagIsBigEndian | kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
  return self;
}

- (void) record {
  NSString *filePath = [NSString stringWithFormat:@"%@/hoge.aiff", DOCUMENTS_FOLDER, caldate];
  fileURL = CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8 *)[filePath UTF8String], [filePath length], NO);

  currentPacket = 0;
  isRecording = YES;

  AudioQueueNewInput(&dataFormat,AudioInputCallback,self,CFRunLoopGetCurrent(),kCFRunLoopCommonModes,0,&queue);
  AudioFileCreateWithURL(fileURL, kAudioFileAIFFType, &dataFormat, kAudioFileFlags_EraseFile, &audioFile);

  UInt32 cookieSize;                                         

  if (AudioQueueGetPropertySize (queue,kAudioQueueProperty_MagicCookie,&cookieSize) == noErr) {
    char* magicCookie = (char *) malloc (cookieSize);
    if (AudioQueueGetProperty (queue,kAudioQueueProperty_MagicCookie,magicCookie,&cookieSize) == noErr) {
      AudioFileSetProperty (audioFile,kAudioFilePropertyMagicCookieData,cookieSize,magicCookie);
    }
    free (magicCookie);
  }

  for(int i=0; i

	
関連する投稿
	

	
[iPhone] 長い In Review の末に今朝 Reject された 
	
iTunes Connect の Tax Info を登録、W-8BEN が届かないトラブル発生 
	
[iPhone 開発メモ] iPhone のホーム画面のような UI を作る 
	
[iPhone] UIWebView のタッチイベントを取得する 
	
[iPhone] UIWebView のリリース前に delegate に nil をセットする必要がある