[Bug 692953] alsasink does not work at all with default value "sync=true"

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692953
  GStreamer | gst-plugins-base | 1.0.9

--- Comment #147 from Robert Krakora <rob.krakora at messagenetsystems.com> 2013-09-11 17:33:33 UTC ---
Oops...cut and paste error on the last comment...I meant to paste this:

static gint
gst_alsasink_write (GstAudioSink * asink, gpointer data, guint length)
{
  GstAlsaSink *alsa;
  gint err;
  gint cptr;
  gint16 *ptr = data;

  alsa = GST_ALSA_SINK (asink);

  if (alsa->iec958 && alsa->need_swap) {
    guint i;

    GST_DEBUG_OBJECT (asink, "swapping bytes");
    for (i = 0; i < length / 2; i++) {
      ptr[i] = GUINT16_SWAP_LE_BE (ptr[i]);
    }
  }

  GST_LOG_OBJECT (asink, "received audio samples buffer of %u bytes", length);

  cptr = length / alsa->bpf;

  GST_ALSA_SINK_LOCK (asink);
  while (cptr > 0) {
    /* start by doing a blocking wait for free space. Set the timeout
     * to 4 times the period time */
    err = snd_pcm_wait (alsa->handle, (4 * alsa->period_time / 1000));
    if (err == -EPIPE) {
      GST_DEBUG_OBJECT (asink, "wait error, %d", err);
      if (xrun_recovery (alsa, alsa->handle, err) < 0) {
        goto write_error;
      }
    }

    GST_DELAY_SINK_LOCK (asink);
    err = snd_pcm_writei (alsa->handle, ptr, cptr);
    GST_DELAY_SINK_UNLOCK (asink);

    GST_DEBUG_OBJECT (asink, "written %d frames out of %d", err, cptr);
    if (err < 0) {
      GST_DEBUG_OBJECT (asink, "Write error: %s", snd_strerror (err));
      if (err == -EAGAIN) {
        continue;
      } else if (err == -ENODEV) {
        goto device_disappeared;
      } else if (xrun_recovery (alsa, alsa->handle, err) < 0) {
        goto write_error;
      }
      continue;
    }

    ptr += snd_pcm_frames_to_bytes (alsa->handle, err);
    cptr -= err;
  }
  GST_ALSA_SINK_UNLOCK (asink);

  return length - (cptr * alsa->bpf);

write_error:
  {
    GST_ALSA_SINK_UNLOCK (asink);
    return length;              /* skip one period */
  }
device_disappeared:
  {
    GST_ELEMENT_ERROR (asink, RESOURCE, WRITE,
        (_("Error outputting to audio device. "
                "The device has been disconnected.")), (NULL));
    goto write_error;
  }
}

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