C++ (Cpp) GstBufferPoolClass::alloc_buffer 예제들

예제 #1

파일: gstbufferpool.c 프로젝트: ConfusedReality/pkg_multimedia_gstreamer

static GstFlowReturn
do_alloc_buffer (GstBufferPool * pool, GstBuffer ** buffer,
    GstBufferPoolAcquireParams * params)
{
  GstBufferPoolPrivate *priv = pool->priv;
  GstFlowReturn result;
  gint cur_buffers, max_buffers;
  GstBufferPoolClass *pclass;

  pclass = GST_BUFFER_POOL_GET_CLASS (pool);

  if (G_UNLIKELY (!pclass->alloc_buffer))
    goto no_function;

  max_buffers = priv->max_buffers;

  /* increment the allocation counter */
  cur_buffers = g_atomic_int_add (&priv->cur_buffers, 1);
  if (max_buffers && cur_buffers >= max_buffers)
    goto max_reached;

  result = pclass->alloc_buffer (pool, buffer, params);
  if (G_UNLIKELY (result != GST_FLOW_OK))
    goto alloc_failed;

  /* lock all metadata and mark as pooled, we want this to remain on
   * the buffer and we want to remove any other metadata that gets added
   * later */
  gst_buffer_foreach_meta (*buffer, mark_meta_pooled, pool);

  /* un-tag memory, this is how we expect the buffer when it is
   * released again */
  GST_BUFFER_FLAG_UNSET (*buffer, GST_BUFFER_FLAG_TAG_MEMORY);

  GST_LOG_OBJECT (pool, "allocated buffer %d/%d, %p", cur_buffers,
      max_buffers, *buffer);

  return result;

  /* ERRORS */
no_function:
  {
    GST_ERROR_OBJECT (pool, "no alloc function");
    return GST_FLOW_NOT_SUPPORTED;
  }
max_reached:
  {
    GST_DEBUG_OBJECT (pool, "max buffers reached");
    g_atomic_int_add (&priv->cur_buffers, -1);
    return GST_FLOW_EOS;
  }
alloc_failed:
  {
    GST_WARNING_OBJECT (pool, "alloc function failed");
    g_atomic_int_add (&priv->cur_buffers, -1);
    return result;
  }
}

예제 #2

파일: gstbufferpool.c 프로젝트: lubing521/gst-embedded-builder

static GstFlowReturn
do_alloc_buffer (GstBufferPool * pool, GstBuffer ** buffer,
    GstBufferPoolAcquireParams * params)
{
  GstBufferPoolPrivate *priv = pool->priv;
  GstFlowReturn result;
  gint cur_buffers, max_buffers;
  GstBufferPoolClass *pclass;

  pclass = GST_BUFFER_POOL_GET_CLASS (pool);

  if (G_UNLIKELY (!pclass->alloc_buffer))
    goto no_function;

  max_buffers = priv->max_buffers;

  /* increment the allocation counter */
  cur_buffers = g_atomic_int_add (&priv->cur_buffers, 1);
  if (max_buffers && cur_buffers >= max_buffers)
    goto max_reached;

  result = pclass->alloc_buffer (pool, buffer, params);
  if (G_UNLIKELY (result != GST_FLOW_OK))
    goto alloc_failed;

  gst_buffer_foreach_meta (*buffer, mark_meta_pooled, pool);

  GST_LOG_OBJECT (pool, "allocated buffer %d/%d, %p", cur_buffers,
      max_buffers, buffer);

  return result;

  /* ERRORS */
no_function:
  {
    GST_ERROR_OBJECT (pool, "no alloc function");
    return GST_FLOW_NOT_SUPPORTED;
  }
max_reached:
  {
    GST_DEBUG_OBJECT (pool, "max buffers reached");
    g_atomic_int_add (&priv->cur_buffers, -1);
    return GST_FLOW_EOS;
  }
alloc_failed:
  {
    GST_WARNING_OBJECT (pool, "alloc function failed");
    g_atomic_int_add (&priv->cur_buffers, -1);
    return result;
  }
}