C++ AudioQueueStart函数代码示例

/*auStart-------------------------------------------------*/
BOOL auPlay(Audio* self)
{ 
  if(!self->isPlaying)
    {

#ifdef __APPLE__
      int i;
      for(i=0; i<AU_NUM_AUDIO_BUFFERS; i++)
        {
          if(self->isOutput)
            auAudioOutputCallback(self, self->queue, self->buffers[i]);
          else
            AudioQueueEnqueueBuffer(self->queue, self->buffers[i],0, NULL);
        }
      OSStatus error = AudioQueueStart(self->queue, NULL);
      if(error) fprintf(stderr, "Audio.c: unable to start queue\n");

#elif defined __linux__
      int error = pthread_create(&(self->thread), NULL, auAudioCallback, self);
      if(error != 0) perror("Audio.c: error creating Audio thread");

#endif
      else self->isPlaying = YES;
    }
    
  return self->isPlaying;
}

 void seekToPacket(uint64_t packet) {
     AudioQueueStop(aqData.mQueue, true);
     aqData.mCurrentPacket = rand()%1000;
     primeBuffer();
     AudioQueueStart(aqData.mQueue, NULL);
     
 }

void CL_SoundOutput_MacOSX::mixer_thread_starting()
{
    audio_format.mSampleRate = frequency;
    audio_format.mFormatID = kAudioFormatLinearPCM;
    audio_format.mFormatFlags = kAudioFormatFlagsCanonical;
    audio_format.mBytesPerPacket = 2 * sizeof(short);
    audio_format.mFramesPerPacket = 1;
    audio_format.mBytesPerFrame = 2 * sizeof(short);
    audio_format.mChannelsPerFrame = 2;
    audio_format.mBitsPerChannel = sizeof(short) * 8;
    audio_format.mReserved = 0;

    OSStatus result = AudioQueueNewOutput(&audio_format, &CL_SoundOutput_MacOSX::static_audio_queue_callback, this, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode, 0, &audio_queue);
    if (result != 0)
        throw CL_Exception("AudioQueueNewOutput failed");

    for (int i = 0; i < fragment_buffer_count; i++)
    {
        result = AudioQueueAllocateBuffer(audio_queue, fragment_size * sizeof(short) * 2, &audio_buffers[i]);
        if (result != 0)
            throw CL_Exception("AudioQueueAllocateBuffer failed");
        audio_queue_callback(audio_queue, audio_buffers[i]);
    }
    
    result = AudioQueueStart(audio_queue, 0);
    if (result != 0)
        throw CL_Exception("AudioQueueStart failed");
}

void
Moose::Sound::CMusicClip::Play()
{
    
 if ( IsPaused())
 {
     m_bPaused = false;
     pthread_mutex_lock(&m_pData->mutex); 
     AudioQueueStart(m_pData->audioQueue, NULL);
     pthread_mutex_unlock(&m_pData->mutex);
 }
 else 
 {
     if ( IsRunning()) Stop();
     if ( m_bHasThread ) 
     {
         void *status;
         pthread_join(m_thread, &status);
         m_bHasThread = false;
     }
     OSStatus err = pthread_create( &m_thread, NULL, audio_decode_play_proc, this);
     if ( err ) {
         g_Error << "Could not create thread for music clip, error: " << err << endl;
         
     }
    }
      
	
	    
    
}

bool QueueAudioData::start()
      {
      printf("QueueAudioData::start()\n");
      AudioQueueStart(audioQueue, 0);
      running = true;
      return true;
      }

void play() {
    int i;

    AudioStreamBasicDescription format;
    AudioQueueRef queue;
    AudioQueueBufferRef buffers[NUM_BUFFERS];

    format.mSampleRate       = SAMPLE_RATE;
    format.mFormatID         = kAudioFormatLinearPCM;
    format.mFormatFlags      = kLinearPCMFormatFlagIsSignedInteger |
                               kAudioFormatFlagIsPacked;
    format.mBitsPerChannel   = 8*sizeof(SAMPLE_TYPE);
    format.mChannelsPerFrame = NUM_CHANNELS;
    format.mBytesPerFrame    = sizeof(SAMPLE_TYPE)*NUM_CHANNELS;
    format.mFramesPerPacket  = 1;
    format.mBytesPerPacket   = format.mBytesPerFrame*format.mFramesPerPacket;
    format.mReserved         = 0;
    
    AudioQueueNewOutput(&format, callback, NULL, CFRunLoopGetCurrent(),
                        kCFRunLoopCommonModes, 0, &queue);
    
    for (i = 0; i < NUM_BUFFERS; i++) {
        AudioQueueAllocateBuffer(queue, BUFFER_SIZE, &buffers[i]);
        buffers[i]->mAudioDataByteSize = BUFFER_SIZE;
        callback(NULL, queue, buffers[i]);
    }
    AudioQueueStart(queue, NULL);
    CFRunLoopRun();    
}

    void play() {
        
        OSStatus status;
        
        aqData.mIsRunning = true;                          // 1
        aqData.mCurrentPacket = 0;                                // 1

        primeBuffer();
        
        Float32 gain = 1.0;                                       // 1
            // Optionally, allow user to override gain setting here
        status = AudioQueueSetParameter (                                  // 2
            aqData.mQueue,                                        // 3
            kAudioQueueParam_Volume,                              // 4
            gain                                                  // 5
        );
        checkStatus(status);

        status = AudioQueueStart (                                  // 2
            aqData.mQueue,                                 // 3
            NULL                                           // 4
        );
        checkStatus(status);

    }

void IPhoneSoundDevice::Enable(bool fEnable)
{
    base::CritScope cs(&m_crit);

    if (fEnable) {
        if (!m_fEnable) {
            memset(m_achnl, 0, sizeof(m_achnl));
            m_tSilence = 0;
            m_fEnable = true;
            for (int i = 0; i < kcBuffers; i++) {
                InitAudioBuffer(m_apaqb[i]);
            }
            AudioQueuePrime(m_haq, 0, NULL);
            AudioQueueStart(m_haq, NULL);
            SetSoundServiceDevice(this);
        }
    } else {
        if (m_fEnable) {
            m_fEnable = false;
            memset(m_achnl, 0, sizeof(m_achnl));
            m_tSilence = 0;
            AudioQueueStop(m_haq, false);
            SetSoundServiceDevice(NULL);
        }
    }
}

int32_t setup_queue(
	ALACMagicCookie cookie,
	PlayerInfo *playerInfo,
	uint32_t buffer_size,
	uint32_t num_buffers,
	uint32_t num_packets
) {
  // Create Audio Queue for ALAC
  AudioStreamBasicDescription inFormat = {0};
  inFormat.mSampleRate = ntohl(cookie.sampleRate);
  inFormat.mFormatID = kAudioFormatAppleLossless;
  inFormat.mFormatFlags = 0; // ALAC uses no flags
  inFormat.mBytesPerPacket = 0; // Variable size (must use AudioStreamPacketDescription)
  inFormat.mFramesPerPacket = ntohl(cookie.frameLength);
  inFormat.mBytesPerFrame = 0; // Compressed
  inFormat.mChannelsPerFrame = 2; // Stero TODO: get from fmtp?
  inFormat.mBitsPerChannel = 0; // Compressed
  inFormat.mReserved = 0;

  OSStatus err = AudioQueueNewOutput(
      &inFormat,
      c_callback,
      playerInfo, // User data
      NULL, // Run on audio queue's thread
      NULL, // Callback run loop's mode
      0, // Reserved
      &playerInfo->queue);

  if (err) return err;

  // Need to set the magic cookie too (tail fmtp)
  err = AudioQueueSetProperty(playerInfo->queue, kAudioQueueProperty_MagicCookie,
			&cookie, sizeof(ALACMagicCookie));
  if (err) return err;

	// Create input buffers, and enqueue using callback
	for (int i = 0; i < num_buffers; i++) {
		AudioQueueBufferRef buffer;
		err = AudioQueueAllocateBufferWithPacketDescriptions(
				playerInfo->queue, buffer_size, num_packets, &buffer);
		if (err) return err;

		c_callback(playerInfo, playerInfo->queue, buffer);
	}

	// Volume full
	err = AudioQueueSetParameter(playerInfo->queue, kAudioQueueParam_Volume, 1.0);
	if (err) return err;

  // Prime
  err = AudioQueuePrime(playerInfo->queue, 0, NULL);
  if (err) return err;

	// Start
	err = AudioQueueStart(playerInfo->queue, NULL);
	if (err) return err;

	return 0;
}

static int Open ( vlc_object_t *p_this )
{
    audio_output_t *p_aout = (audio_output_t *)p_this;
    struct aout_sys_t *p_sys = malloc(sizeof(aout_sys_t));
    p_aout->sys = p_sys;

    OSStatus status = 0;

    // Setup the audio device.
    AudioStreamBasicDescription deviceFormat;
    deviceFormat.mSampleRate = 44100;
    deviceFormat.mFormatID = kAudioFormatLinearPCM;
    deviceFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger; // Signed integer, little endian
    deviceFormat.mBytesPerPacket = 4;
    deviceFormat.mFramesPerPacket = 1;
    deviceFormat.mBytesPerFrame = 4;
    deviceFormat.mChannelsPerFrame = 2;
    deviceFormat.mBitsPerChannel = 16;
    deviceFormat.mReserved = 0;

    // Create a new output AudioQueue for the device.
    status = AudioQueueNewOutput(&deviceFormat,         // Format
                                 AudioQueueCallback,    // Callback
                                 p_aout,                // User data, passed to the callback
                                 CFRunLoopGetMain(),    // RunLoop
                                 kCFRunLoopDefaultMode, // RunLoop mode
                                 0,                     // Flags ; must be zero (per documentation)...
                                 &(p_sys->audioQueue)); // Output

    // This will be used for boosting the audio without the need of a mixer (floating-point conversion is expensive on ARM)
    // AudioQueueSetParameter(p_sys->audioQueue, kAudioQueueParam_Volume, 12.0); // Defaults to 1.0

    msg_Dbg(p_aout, "New AudioQueue output created (status = %i)", status);

    // Allocate buffers for the AudioQueue, and pre-fill them.
    for (int i = 0; i < NUMBER_OF_BUFFERS; ++i) {
        AudioQueueBufferRef buffer = NULL;
        status = AudioQueueAllocateBuffer(p_sys->audioQueue, FRAME_SIZE * 4, &buffer);
        AudioQueueCallback(NULL, p_sys->audioQueue, buffer);
    }

    /* Volume is entirely done in software. */
    aout_SoftVolumeInit( p_aout );

    p_aout->format.i_format = VLC_CODEC_S16L;
    p_aout->format.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
    p_aout->format.i_rate = 44100;
    aout_PacketInit(p_aout, &p_sys->packet, FRAME_SIZE);
    p_aout->pf_play = aout_PacketPlay;
    p_aout->pf_pause = aout_PacketPause;
    p_aout->pf_flush = aout_PacketFlush;

    msg_Dbg(p_aout, "Starting AudioQueue (status = %i)", status);
    status = AudioQueueStart(p_sys->audioQueue, NULL);

    return VLC_SUCCESS;
}

int app_OpenSound(int samples_per_sync, int sample_rate) {
    Float64 sampleRate = 44100.0;
    int i;

    LOGDEBUG("app_SoundOpen()");
    
    app_MuteSound();
    
    if(preferences.muted)
    {
    	return 0;
    }

    soundInit = 0;

    in.mDataFormat.mSampleRate = sampleRate;
    in.mDataFormat.mFormatID = kAudioFormatLinearPCM;
    in.mDataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger
                                | kAudioFormatFlagIsPacked;
    in.mDataFormat.mBytesPerPacket = 4;
    in.mDataFormat.mFramesPerPacket = 1;
    in.mDataFormat.mBytesPerFrame = 2;
    in.mDataFormat.mChannelsPerFrame = 2;
    in.mDataFormat.mBitsPerChannel = 16;

    /* Pre-buffer before we turn on audio */
    UInt32 err;
    err = AudioQueueNewOutput(&in.mDataFormat,
                      AQBufferCallback,
                      &in,
                      NULL,
                      kCFRunLoopCommonModes,
                      0,
                      &in.queue);
   if (err) {
     LOGDEBUG("AudioQueueNewOutput err %d\n", err);
   }

   in.frameCount = 512 * 1; //512; //(1024 * (16)) / 4;
   UInt32 bufferBytes = in.frameCount * in.mDataFormat.mBytesPerFrame;

   for (i=0; i<AUDIO_BUFFERS; i++) {
      err = AudioQueueAllocateBuffer(in.queue, bufferBytes, &in.mBuffers[i]);
      if (err) {
	LOGDEBUG("AudioQueueAllocateBuffer[%d] err %d\n",i, err);
      }
      /* "Prime" by calling the callback once per buffer */
      AQBufferCallback (&in, in.queue, in.mBuffers[i]);
   }

   soundInit = 1;
   LOGDEBUG("app_QueueSample.AudioQueueStart");
   err = AudioQueueStart(in.queue, NULL);
   
    return 0;
}

		OSStatus Start()
		{
			OSStatus result = AudioQueuePrime(mQueue, 1, NULL);	
			if (result)
			{
				printf("Error priming queue");
				return result;
			}
			return AudioQueueStart(mQueue, NULL);
		}

OSStatus StartQueueIfNeeded(struct audioPlayer* player)
{
	OSStatus err = noErr;
	if (!player->started) {		// start the queue if it has not been started already
		err = AudioQueueStart(player->audioQueue, NULL);
		if (err) { PRINTERROR("AudioQueueStart"); player->failed = true; return err; }		
		player->started = true;
	}
	return err;
}

void audio_start(audio_player_t *player) {
	state_t *state = (state_t *) player->internal_state;
	if (noErr != AudioQueueStart(state->queue, NULL)) puts("AudioQueueStart failed");
	state->playing = true;
	if (state->running) {
		if (player->on_start) {
			player->on_start(player);
		}
	}
}

OSStatus StartQueueIfNeeded(MyData* myData)
{
	OSStatus err = noErr;
	if (!myData->started) {		// start the queue if it has not been started already
		err = AudioQueueStart(myData->audioQueue, NULL);
		if (err) { PRINTERROR("AudioQueueStart"); myData->failed = true; return err; }		
		myData->started = true;
		printf("started\n");
	}
	return err;
}