C++ (Cpp) audio_get_play_gainの例

コード例 #1

ファイル: audioplay.c プロジェクト: 0xffea/illumos-gate

/* Open the audio device and initalize it. */
static void
open_audio(void)
{
	int		err;
	double		vol;

	/* Return if already open */
	if (Audio_fd >= 0)
		return;

	/* Try opening without waiting, first */
	Audio_fd = open(Audio_dev, O_WRONLY | O_NONBLOCK);
	if ((Audio_fd < 0) && (errno == EBUSY)) {
		if (Immediate) {
			Error(stderr, MGET("%s: %s is busy\n"),
			    prog, Audio_dev);
			exit(1);
		}
		if (Verbose) {
			Error(stderr, MGET("%s: waiting for %s..."),
			    prog, Audio_dev);
			(void) fflush(stderr);
		}
		/* Now hang until it's open */
		Audio_fd = open(Audio_dev, O_WRONLY);
		if (Verbose)
			Error(stderr, (Audio_fd < 0) ? "\n" : MGET("open\n"));
	}
	if (Audio_fd < 0) {
		Error(stderr, MGET("%s: error opening "), prog);
		perror(Audio_dev);
		exit(1);
	}

	/* Clear the non-blocking flag (in System V it persists after open) */
	(void) fcntl(Audio_fd, F_SETFL,
	    (fcntl(Audio_fd, F_GETFL, 0) & ~(O_NDELAY | O_NONBLOCK)));

	/* Get the device output encoding configuration */
	if (audio_get_play_config(Audio_fd, &Dev_hdr) != AUDIO_SUCCESS) {
		Error(stderr, MGET("%s: %s is not an audio device\n"),
		    prog, Audio_dev);
		exit(1);
	}

	/* If -v flag, set the output volume now */
	if (Volume != INT_MAX) {
		vol = (double)Volume / (double)MAX_GAIN;
		(void) audio_get_play_gain(Audio_fd, &Savevol);
		err = audio_set_play_gain(Audio_fd, &vol);
		if (err != AUDIO_SUCCESS) {
			Error(stderr,
			    MGET("%s: could not set output volume for %s\n"),
			    prog, Audio_dev);
			exit(1);
		}
	}
}

コード例 #2

ファイル: sunplay.c プロジェクト: boukeversteegh/chise

static int
init_device (int volume, unsigned char *data, int fd,
	     unsigned int *header_length)
{
#ifdef SUNOS4_0_3
  if (header_length) *header_length = 0;
  return 0;
#else
  Audio_hdr file_hdr;

  reset_volume_p = 0;
  reset_device_p = 0;

  if (data && fd) ABORT (); /* one or the other */

  if (AUDIO_SUCCESS != audio_get_play_config (audio_fd, &dev_hdr))
    {
      perror ("Not a valid audio device");
      return 1;
    }

  if (AUDIO_SUCCESS != (data
			? audio_decode_filehdr (data, &file_hdr, header_length)
			: audio_read_filehdr (fd, &file_hdr, 0, 0)))
    {
      if (data)
	perror ("invalid audio data");
      else
	perror ("invalid audio file");
      return 1;
    }

  audio_flush_play (audio_fd);

  if (!initialized_device_p || (0 != audio_cmp_hdr (&dev_hdr, &file_hdr)))
    {
      Audio_hdr new_hdr;
      new_hdr = file_hdr;
      reset_device_p = 1;
      initialized_device_p = 1;
      if (AUDIO_SUCCESS != audio_set_play_config (audio_fd, &new_hdr))
	{
	  char buf1 [100], buf2 [100], buf3 [250];
	  audio_enc_to_str (&file_hdr, buf1);
	  audio_enc_to_str (&new_hdr, buf2);
	  sprintf (buf3, "wanted %s, got %s", buf1, buf2);
	  warn (buf3);
	  return 1;
	}
    }

  if (volume < 0 || volume > 100)
    {
      char buf [255];
      sprintf (buf, "volume must be between 0 and 100 (not %d)", volume);
      warn (buf);
      return 1;
    }
  {
    /* set the volume; scale it to 0.0 - 1.0 */
    double V = (volume / 100.0);
    audio_get_play_gain (audio_fd, &old_volume);
    reset_volume_p = 1;
    audio_set_play_gain (audio_fd, &V);
  }

  return 0;
#endif
}