C++ (Cpp) gst_buffer_iterate_meta Examples

Example #1

File: tcp.c Project: ConfusedReality/pkg_multimedia_gst-plugins-base

GST_END_TEST
#ifdef HAVE_GIO_UNIX_2_0
static GSocketControlMessage *
get_control_message_meta (GstBuffer * buf)
{
  GstMeta *meta;
  gpointer iter_state = NULL;

  while ((meta = gst_buffer_iterate_meta (buf, &iter_state)) != NULL) {
    if (meta->info->api == GST_NET_CONTROL_MESSAGE_META_API_TYPE)
      return ((GstNetControlMessageMeta *) meta)->message;
  }
  fail ("Expected GSocketControlMessage attached to buffer");
  return NULL;
}

Example #2

File: gstvideometa.c Project: lubing521/gst-embedded-builder

/**
 * gst_buffer_get_video_meta_id:
 * @buffer: a #GstBuffer
 * @id: a metadata id
 *
 * Find the #GstVideoMeta on @buffer with the given @id.
 *
 * Buffers can contain multiple #GstVideoMeta metadata items when dealing with
 * multiview buffers.
 *
 * Returns: the #GstVideoMeta with @id or %NULL when there is no such metadata
 * on @buffer.
 */
GstVideoMeta *
gst_buffer_get_video_meta_id (GstBuffer * buffer, gint id)
{
  gpointer state = NULL;
  GstMeta *meta;
  const GstMetaInfo *info = GST_VIDEO_META_INFO;

  while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
    if (meta->info->api == info->api) {
      GstVideoMeta *vmeta = (GstVideoMeta *) meta;
      if (vmeta->id == id)
        return vmeta;
    }
  }
  return NULL;
}

Example #3

File: gstaudiometa.c Project: ConfusedReality/pkg_multimedia_gst-plugins-base

/**
 * gst_buffer_get_audio_downmix_meta_for_channels:
 * @buffer: a #GstBuffer
 * @to_position: (array length=to_channels): the channel positions of
 *   the destination
 * @to_channels: The number of channels of the destination
 *
 * Find the #GstAudioDownmixMeta on @buffer for the given destination
 * channel positions.
 *
 * Returns: (transfer none): the #GstAudioDownmixMeta on @buffer.
 */
GstAudioDownmixMeta *
gst_buffer_get_audio_downmix_meta_for_channels (GstBuffer * buffer,
    const GstAudioChannelPosition * to_position, gint to_channels)
{
  gpointer state = NULL;
  GstMeta *meta;
  const GstMetaInfo *info = GST_AUDIO_DOWNMIX_META_INFO;

  while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
    if (meta->info->api == info->api) {
      GstAudioDownmixMeta *ameta = (GstAudioDownmixMeta *) meta;
      if (ameta->to_channels == to_channels &&
          memcmp (ameta->to_position, to_position,
              sizeof (GstAudioChannelPosition) * to_channels) == 0)
        return ameta;
    }
  }
  return NULL;
}

Example #4

File: gstvideometa.c Project: jpakkane/gstreamer-plugins-base

/**
 * gst_buffer_get_video_meta:
 * @buffer: a #GstBuffer
 *
 * Find the #GstVideoMeta on @buffer with the lowest @id.
 *
 * Buffers can contain multiple #GstVideoMeta metadata items when dealing with
 * multiview buffers.
 *
 * Returns: (transfer none): the #GstVideoMeta with lowest id (usually 0) or %NULL when there
 * is no such metadata on @buffer.
 */
GstVideoMeta *
gst_buffer_get_video_meta (GstBuffer * buffer)
{
  gpointer state = NULL;
  GstVideoMeta *out = NULL;
  GstMeta *meta;
  const GstMetaInfo *info = GST_VIDEO_META_INFO;

  while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
    if (meta->info->api == info->api) {
      GstVideoMeta *vmeta = (GstVideoMeta *) meta;
      if (vmeta->id == 0)
        return vmeta;           /* Early out for id 0 */
      if (out == NULL || vmeta->id < out->id)
        out = vmeta;
    }
  }
  return out;
}