C++ (Cpp) GST_ALSA_SRC_LOCK Beispiele

Beispiel #1

Datei: gstalsasrc.c Projekt: Distrotech/gst-plugins-base

static void
gst_alsasrc_reset (GstAudioSrc * asrc)
{
  GstAlsaSrc *alsa;
  gint err;

  alsa = GST_ALSA_SRC (asrc);

  GST_ALSA_SRC_LOCK (asrc);
  GST_DEBUG_OBJECT (alsa, "drop");
  CHECK (snd_pcm_drop (alsa->handle), drop_error);
  GST_DEBUG_OBJECT (alsa, "prepare");
  CHECK (snd_pcm_prepare (alsa->handle), prepare_error);
  GST_DEBUG_OBJECT (alsa, "reset done");
  GST_ALSA_SRC_UNLOCK (asrc);

  return;

  /* ERRORS */
drop_error:
  {
    GST_ERROR_OBJECT (alsa, "alsa-reset: pcm drop error: %s",
        snd_strerror (err));
    GST_ALSA_SRC_UNLOCK (asrc);
    return;
  }
prepare_error:
  {
    GST_ERROR_OBJECT (alsa, "alsa-reset: pcm prepare error: %s",
        snd_strerror (err));
    GST_ALSA_SRC_UNLOCK (asrc);
    return;
  }
}

Beispiel #2

Datei: gstalsasrc.c Projekt: thaytan/gst-plugins-base

static guint
gst_alsasrc_read (GstAudioSrc * asrc, gpointer data, guint length,
    GstClockTime * timestamp)
{
  GstAlsaSrc *alsa;
  gint err;
  gint cptr;
  guint8 *ptr = data;

  alsa = GST_ALSA_SRC (asrc);

  cptr = length / alsa->bpf;

  GST_ALSA_SRC_LOCK (asrc);
  while (cptr > 0) {
    GST_DELAY_SRC_LOCK (asrc);
    err = snd_pcm_readi (alsa->handle, ptr, cptr);
    GST_DELAY_SRC_UNLOCK (asrc);

    if (err < 0) {
      if (err == -EAGAIN) {
        GST_DEBUG_OBJECT (asrc, "Read error: %s", snd_strerror (err));
        continue;
      } else if (err == -ENODEV) {
        goto device_disappeared;
      } else if (xrun_recovery (alsa, alsa->handle, err) < 0) {
        goto read_error;
      }
      continue;
    }

    ptr += snd_pcm_frames_to_bytes (alsa->handle, err);
    cptr -= err;
  }
  GST_ALSA_SRC_UNLOCK (asrc);

  /* if driver timestamps are enabled we need to return this here */
  if (alsa->driver_timestamps && timestamp)
    *timestamp = gst_alsasrc_get_timestamp (alsa);

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

read_error:
  {
    GST_ALSA_SRC_UNLOCK (asrc);
    return length;              /* skip one period */
  }
device_disappeared:
  {
    GST_ELEMENT_ERROR (asrc, RESOURCE, READ,
        (_("Error recording from audio device. "
                "The device has been disconnected.")), (NULL));
    GST_ALSA_SRC_UNLOCK (asrc);
    return (guint) - 1;
  }
}