C++ GstBufferPoolClass::release_buffer方法代码示例

/* the default implementation for preallocating the buffers
 * in the pool */
static gboolean
default_start (GstBufferPool * pool)
{
  guint i;
  GstBufferPoolPrivate *priv = pool->priv;
  GstBufferPoolClass *pclass;

  pclass = GST_BUFFER_POOL_GET_CLASS (pool);

  /* we need to prealloc buffers */
  for (i = 0; i < priv->min_buffers; i++) {
    GstBuffer *buffer;

    if (do_alloc_buffer (pool, &buffer, NULL) != GST_FLOW_OK)
      goto alloc_failed;

    /* release to the queue, we call the vmethod directly, we don't need to do
     * the other refcount handling right now. */
    if (G_LIKELY (pclass->release_buffer))
      pclass->release_buffer (pool, buffer);
  }
  return TRUE;

  /* ERRORS */
alloc_failed:
  {
    GST_WARNING_OBJECT (pool, "failed to allocate buffer");
    return FALSE;
  }
}

static gboolean
gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
{
  GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
  GstBufferPoolClass *pclass = GST_BUFFER_POOL_CLASS (parent_class);
  gboolean ret;
  gint i;

  GST_DEBUG_OBJECT (pool, "stopping pool");

  if (pool->group_released_handler > 0) {
    g_signal_handler_disconnect (pool->vallocator,
        pool->group_released_handler);
    pool->group_released_handler = 0;
  }

  if (pool->other_pool) {
    gst_object_unref (pool->other_pool);
    pool->other_pool = NULL;
  }

  if (!gst_v4l2_buffer_pool_streamoff (pool))
    goto streamoff_failed;

  if (pool->vallocator)
    gst_v4l2_allocator_flush (pool->vallocator);

  for (i = 0; i < VIDEO_MAX_FRAME; i++) {
    if (pool->buffers[i]) {
      GstBuffer *buffer = pool->buffers[i];

      pool->buffers[i] = NULL;

      if (V4L2_TYPE_IS_OUTPUT (pool->obj->type))
        gst_buffer_unref (buffer);
      else
        pclass->release_buffer (bpool, buffer);

      g_atomic_int_add (&pool->num_queued, -1);
    }
  }

  ret = GST_BUFFER_POOL_CLASS (parent_class)->stop (bpool);

  if (ret && pool->vallocator) {
    GstV4l2Return vret;

    vret = gst_v4l2_allocator_stop (pool->vallocator);

    if (vret == GST_V4L2_BUSY)
      GST_WARNING_OBJECT (pool, "some buffers are still outstanding");

    ret = (vret == GST_V4L2_OK);
  }

  return ret;

  /* ERRORS */
streamoff_failed:
  GST_ERROR_OBJECT (pool, "device refused to stop streaming");
  return FALSE;
}

static void
gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool, GstBuffer * buffer)
{
  GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
  GstBufferPoolClass *pclass = GST_BUFFER_POOL_CLASS (parent_class);
  GstV4l2Object *obj = pool->obj;

  GST_DEBUG_OBJECT (pool, "release buffer %p", buffer);

  switch (obj->type) {
    case V4L2_BUF_TYPE_VIDEO_CAPTURE:
    case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
      /* capture, put the buffer back in the queue so that we can refill it
       * later. */
      switch (obj->mode) {
        case GST_V4L2_IO_RW:
          /* release back in the pool */
          pclass->release_buffer (bpool, buffer);
          break;

        case GST_V4L2_IO_DMABUF:
        case GST_V4L2_IO_MMAP:
        case GST_V4L2_IO_USERPTR:
        case GST_V4L2_IO_DMABUF_IMPORT:
        {
          if (gst_v4l2_is_buffer_valid (buffer, NULL)) {
            /* queue back in the device */
            if (pool->other_pool)
              gst_v4l2_buffer_pool_prepare_buffer (pool, buffer, NULL);
            if (gst_v4l2_buffer_pool_qbuf (pool, buffer) != GST_FLOW_OK)
              pclass->release_buffer (bpool, buffer);
          } else {
            /* Simply release invalide/modified buffer, the allocator will
             * give it back later */
            GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
            pclass->release_buffer (bpool, buffer);
          }
          break;
        }
        default:
          g_assert_not_reached ();
          break;
      }
      break;

    case V4L2_BUF_TYPE_VIDEO_OUTPUT:
    case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
      switch (obj->mode) {
        case GST_V4L2_IO_RW:
          /* release back in the pool */
          pclass->release_buffer (bpool, buffer);
          break;

        case GST_V4L2_IO_MMAP:
        case GST_V4L2_IO_DMABUF:
        case GST_V4L2_IO_USERPTR:
        case GST_V4L2_IO_DMABUF_IMPORT:
        {
          GstV4l2MemoryGroup *group;
          guint index;

          if (!gst_v4l2_is_buffer_valid (buffer, &group)) {
            /* Simply release invalide/modified buffer, the allocator will
             * give it back later */
            GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
            pclass->release_buffer (bpool, buffer);
            break;
          }

          index = group->buffer.index;

          if (pool->buffers[index] == NULL) {
            GST_LOG_OBJECT (pool, "buffer %u not queued, putting on free list",
                index);

            /* Remove qdata, this will unmap any map data in userptr */
            gst_mini_object_set_qdata (GST_MINI_OBJECT (buffer),
                GST_V4L2_IMPORT_QUARK, NULL, NULL);

            /* reset to default size */
            gst_v4l2_allocator_reset_group (pool->vallocator, group);

            /* playback, put the buffer back in the queue to refill later. */
            pclass->release_buffer (bpool, buffer);
          } else {
            /* We keep a ref on queued buffer, so this should never happen */
            g_assert_not_reached ();
          }
          break;
        }

        default:
          g_assert_not_reached ();
          break;
      }
      break;

    default:
      g_assert_not_reached ();
      break;
//.........这里部分代码省略.........