ao_macosx.c

自己移植的linux下的流媒体播放器原代码,支持mms协议,支持ftp和http协议.

        ao_msg(MSGT_AO,MSGL_WARN, 
		"AudioHardwareGetProperty returned %d\n",
		(int)status);
	return CONTROL_FALSE;
    }
    
    if (ao->outputDeviceID == kAudioDeviceUnknown) {
        ao_msg(MSGT_AO,MSGL_WARN, "AudioHardwareGetProperty: ao->outputDeviceID is kAudioDeviceUnknown\n");
	return CONTROL_FALSE;
    }


    propertySize = sizeof(ao->outputStreamBasicDescription);
    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormat, &propertySize, &ao->outputStreamBasicDescription);
    if(!status) print_format("default:",&ao->outputStreamBasicDescription);


#if 1
// dump supported format list:
{   AudioStreamBasicDescription* p;
    Boolean ow;
    int i;
    propertySize=0; //sizeof(p);
//    status = AudioDeviceGetPropertyInfo(ao->outputDeviceID, 0, false, kAudioStreamPropertyPhysicalFormats, &propertySize, &ow);
    status = AudioDeviceGetPropertyInfo(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormats, &propertySize, &ow);
    if (status) {
        ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceGetPropertyInfo returned 0x%X when getting kAudioDevicePropertyStreamFormats\n", (int)status);
    }
    p=malloc(propertySize);
//    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioStreamPropertyPhysicalFormats, &propertySize, p);
    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormats, &propertySize, p);
    if (status) {
        ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceGetProperty returned 0x%X when getting kAudioDevicePropertyStreamFormats\n", (int)status);
//	return CONTROL_FALSE;
    }
    for(i=0;i<propertySize/sizeof(AudioStreamBasicDescription);i++)
	print_format("support:",&p[i]);
//    printf("FORMATS: (%d) %p %p %p %p\n",propertySize,p[0],p[1],p[2],p[3]);
    free(p);
}
#endif

    // fill in our wanted format, and let's see if the driver accepts it or
    // offers some similar alternative:
    propertySize = sizeof(ao->outputStreamBasicDescription);
    memset(&ao->outputStreamBasicDescription,0,propertySize);
    ao->outputStreamBasicDescription.mSampleRate=rate;
    ao->outputStreamBasicDescription.mFormatID=kAudioFormatLinearPCM;
    ao->outputStreamBasicDescription.mChannelsPerFrame=channels;
    switch(format&AF_FORMAT_BITS_MASK){
    case AF_FORMAT_8BIT:  ao->outputStreamBasicDescription.mBitsPerChannel=8; break;
    case AF_FORMAT_16BIT: ao->outputStreamBasicDescription.mBitsPerChannel=16; break;
    case AF_FORMAT_24BIT: ao->outputStreamBasicDescription.mBitsPerChannel=24; break;
    case AF_FORMAT_32BIT: ao->outputStreamBasicDescription.mBitsPerChannel=32; break;
    }
    if((format&AF_FORMAT_POINT_MASK)==AF_FORMAT_F){
	// float
	ao->outputStreamBasicDescription.mFormatFlags=kAudioFormatFlagIsFloat|kAudioFormatFlagIsPacked;
    } else if((format&AF_FORMAT_SIGN_MASK)==AF_FORMAT_SI){
	// signed int
	ao->outputStreamBasicDescription.mFormatFlags=kAudioFormatFlagIsSignedInteger|kAudioFormatFlagIsPacked;
    } else {
	// unsigned int
	ao->outputStreamBasicDescription.mFormatFlags=kAudioFormatFlagIsPacked;
    }
    if((format&AF_FORMAT_END_MASK)==AF_FORMAT_BE)
	ao->outputStreamBasicDescription.mFormatFlags|=kAudioFormatFlagIsBigEndian;

    ao->outputStreamBasicDescription.mBytesPerPacket=
    ao->outputStreamBasicDescription.mBytesPerFrame=channels*(ao->outputStreamBasicDescription.mBitsPerChannel/8);
    ao->outputStreamBasicDescription.mFramesPerPacket=1;

    print_format("wanted: ",&ao->outputStreamBasicDescription);

    // try 1: ask if it accepts our specific requirements?
    propertySize = sizeof(ao->outputStreamBasicDescription);
//    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioStreamPropertyPhysicalFormatMatch, &propertySize, &ao->outputStreamBasicDescription);
    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormatMatch, &propertySize, &ao->outputStreamBasicDescription);
    if (status || ao->outputStreamBasicDescription.mSampleRate!=rate
	       || ao->outputStreamBasicDescription.mFormatID!=kAudioFormatLinearPCM) {
        ao_msg(MSGT_AO,MSGL_V, "AudioDeviceGetProperty returned 0x%X when getting kAudioDevicePropertyStreamFormatMatch\n", (int)status);
	// failed (error, bad rate or bad type)
	// try 2: set only rate & type, no format details (bits, channels etc)
	propertySize = sizeof(ao->outputStreamBasicDescription);
	memset(&ao->outputStreamBasicDescription,0,propertySize);
	ao->outputStreamBasicDescription.mSampleRate=rate;
	ao->outputStreamBasicDescription.mFormatID=kAudioFormatLinearPCM;
//	status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioStreamPropertyPhysicalFormatMatch, &propertySize, &ao->outputStreamBasicDescription);
	status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormatMatch, &propertySize, &ao->outputStreamBasicDescription);
	if (status || ao->outputStreamBasicDescription.mFormatID!=kAudioFormatLinearPCM) {
    	    ao_msg(MSGT_AO,MSGL_V, "AudioDeviceGetProperty returned 0x%X when getting kAudioDevicePropertyStreamFormatMatch\n", (int)status);
	    // failed again. (error or bad type)
	    // giving up... just read the default.
	    propertySize = sizeof(ao->outputStreamBasicDescription);
//	    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioStreamPropertyPhysicalFormat, &propertySize, &ao->outputStreamBasicDescription);
	    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormat, &propertySize, &ao->outputStreamBasicDescription);
	    if (status) {
		// failed to read the default format - WTF?
    		ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceGetProperty returned 0x%X when getting kAudioDevicePropertyStreamFormat\n", (int)status);
		return CONTROL_FALSE;
	    }
	}
    }

//    propertySize = sizeof(ao->outputStreamBasicDescription);
//    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormatSupported, &propertySize, &ao->outputStreamBasicDescription);
//    if (status) {
//        ao_msg(MSGT_AO,MSGL_V, "AudioDeviceGetProperty returned 0x%X when getting kAudioDevicePropertyStreamFormatSupported\n", (int)status);
//    }

    // ok, now try to set the new (default or matched) audio format:
    print_format("best:   ",&ao->outputStreamBasicDescription);
    propertySize = sizeof(ao->outputStreamBasicDescription);
    status = AudioDeviceSetProperty(ao->outputDeviceID, 0, 0, false, kAudioDevicePropertyStreamFormat, propertySize, &ao->outputStreamBasicDescription);
    if(status)
	ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceSetProperty returned 0x%X when getting kAudioDevicePropertyStreamFormat\n", (int)status);

    // see what did we get finally... we'll be forced to use this anyway :(
    propertySize = sizeof(ao->outputStreamBasicDescription);
    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyStreamFormat, &propertySize, &ao->outputStreamBasicDescription);
    print_format("final:  ",&ao->outputStreamBasicDescription);

    /* get requested buffer length */
    // TODO: set NUM_BUFS dinamically, based on buffer size!
    propertySize = sizeof(ao->chunk_size);
    status = AudioDeviceGetProperty(ao->outputDeviceID, 0, false, kAudioDevicePropertyBufferSize, &propertySize, &ao->chunk_size);
    if (status) {
        ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceGetProperty returned %d when getting kAudioDevicePropertyBufferSize\n", (int)status);
	return CONTROL_FALSE;
    }
    ao_msg(MSGT_AO,MSGL_V, "%5d chunk size\n", (int)ao->chunk_size);

    ao_data.samplerate = ao->outputStreamBasicDescription.mSampleRate;
	ao_data.channels = channels;
    ao_data.outburst = ao_data.buffersize = ao->chunk_size;
    ao_data.bps = 
      ao_data.samplerate * ao->outputStreamBasicDescription.mBytesPerFrame;

    if (ao->outputStreamBasicDescription.mFormatID == kAudioFormatLinearPCM) {
      uint32_t flags = ao->outputStreamBasicDescription.mFormatFlags;
      if (flags & kAudioFormatFlagIsFloat) {
	ao_data.format = (flags&kAudioFormatFlagIsBigEndian) ? AF_FORMAT_FLOAT_BE : AF_FORMAT_FLOAT_LE;
      } else {
	ao_msg(MSGT_AO,MSGL_WARN, "Unsupported audio output "
	       "format 0x%X. Please report this to the developer\n", format);
	return CONTROL_FALSE;
      }
      
    } else {
      /* TODO: handle AFMT_AC3, AFMT_MPEG & friends */
      ao_msg(MSGT_AO,MSGL_WARN, "Default Audio Device doesn't "
	     "support Linear PCM!\n");
      return CONTROL_FALSE;
    }
  
    /* Allocate ring-buffer memory */
    ao->num_chunks = NUM_BUFS;
    ao->buffer_len = (ao->num_chunks + 1) * ao->chunk_size;
    ao->buffer = (unsigned char *)malloc(ao->buffer_len);


    /* Prepare for playback */

    /* Set the IO proc that CoreAudio will call when it needs data */
    status = AudioDeviceAddIOProc(ao->outputDeviceID, audioDeviceIOProc, NULL);
    if (status) {
        ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceAddIOProc returned %d\n", (int)status);
	return CONTROL_FALSE;
    }
 
    /* Start callback */
    reset();
    
    return CONTROL_OK;
}


static int play(void* output_samples,int num_bytes,int flags)
{  
  return write_buffer(output_samples, num_bytes);
}

/* set variables and buffer to initial state */
static void reset()
{
  audio_pause();
  /* reset ring-buffer state */
  ao->buf_read_pos=0;
  ao->buf_write_pos=0;
  audio_resume();
  
  return;
}


/* return available space */
static int get_space()
{
  return buf_free();
}


/* return delay until audio is played */
static float get_delay()
{
  int buffered = ao->buffer_len - ao->chunk_size - buf_free(); // could be less
  // inaccurate, should also contain the data buffered e.g. by the OS
  return (float)(buffered)/(float)ao_data.bps;
}


/* unload plugin and deregister from coreaudio */
static void uninit(int immed)
{
  int i;
  OSErr status;

  reset();

  status = AudioDeviceRemoveIOProc(ao->outputDeviceID, audioDeviceIOProc);
  if (status)
    ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceRemoveIOProc "
	   "returned %d\n", (int)status);

  free(ao->buffer);
  free(ao);
}


/* stop playing, keep buffers (for pause) */
static void audio_pause()
{
  OSErr status;

  /* stop callback */
  status = AudioDeviceStop(ao->outputDeviceID, audioDeviceIOProc);
  if (status)
    ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceStop returned %d\n",
	   (int)status);
}


/* resume playing, after audio_pause() */
static void audio_resume()
{
  OSErr status = AudioDeviceStart(ao->outputDeviceID, audioDeviceIOProc);
  if (status)
    ao_msg(MSGT_AO,MSGL_WARN, "AudioDeviceStart returned %d\n",
	   (int)status);
}