Esempi in C++ (Cpp) per GstCMApi::FigFormatDescriptionRetain

Esempio n. 1

File: miovideosrc.c Progetto: collects/gst-plugins-bad

static GstFlowReturn
gst_mio_video_src_create (GstPushSrc * pushsrc, GstBuffer ** buf)
{
  GstMIOVideoSrc *self = GST_MIO_VIDEO_SRC_CAST (pushsrc);
  GstCMApi *cm = self->ctx->cm;
  CMFormatDescriptionRef format;

  FRAME_QUEUE_LOCK (self);
  while (self->running && g_queue_is_empty (self->queue))
    FRAME_QUEUE_WAIT (self);
  *buf = g_queue_pop_tail (self->queue);
  FRAME_QUEUE_UNLOCK (self);

  if (G_UNLIKELY (!self->running))
    goto shutting_down;

  format = cm->CMSampleBufferGetFormatDescription
      (GST_CORE_MEDIA_BUFFER (*buf)->sample_buf);
  if (self->prev_format != NULL &&
      !cm->CMFormatDescriptionEqual (format, self->prev_format)) {
    goto unexpected_format;
  }
  cm->FigFormatDescriptionRelease (self->prev_format);
  self->prev_format = cm->FigFormatDescriptionRetain (format);

  if (self->prev_offset == GST_BUFFER_OFFSET_NONE ||
      GST_BUFFER_OFFSET (*buf) - self->prev_offset != 1) {
    GST_BUFFER_FLAG_SET (*buf, GST_BUFFER_FLAG_DISCONT);
  }
  self->prev_offset = GST_BUFFER_OFFSET (*buf);

  return GST_FLOW_OK;

  /* ERRORS */
shutting_down:
  {
    if (*buf != NULL) {
      gst_buffer_unref (*buf);
      *buf = NULL;
    }

    return GST_FLOW_FLUSHING;
  }
unexpected_format:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, READ,
        ("capture format changed unexpectedly"),
        ("another application likely reconfigured the device"));

    if (*buf != NULL) {
      gst_buffer_unref (*buf);
      *buf = NULL;
    }

    return GST_FLOW_ERROR;
  }
}