C++ (Cpp) GST_BASE_VIDEO_PARSE_GET_CLASS Examples

Example #1

File: gstbasevideoparse.c Project: JJCG/gst-plugins-bad

static GstFlowReturn
gst_base_video_parse_chain (GstPad * pad, GstBuffer * buf)
{
  GstBaseVideoParse *base_video_parse;
  GstBaseVideoParseClass *klass;
  GstBuffer *buffer;
  GstFlowReturn ret;

  GST_DEBUG ("chain with %d bytes", GST_BUFFER_SIZE (buf));

  base_video_parse = GST_BASE_VIDEO_PARSE (GST_PAD_PARENT (pad));
  klass = GST_BASE_VIDEO_PARSE_GET_CLASS (base_video_parse);

  if (!base_video_parse->started) {
    klass->start (base_video_parse);
    base_video_parse->started = TRUE;
  }

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))) {
    GST_DEBUG_OBJECT (base_video_parse, "received DISCONT buffer");
    gst_base_video_parse_reset (base_video_parse);
    base_video_parse->discont = TRUE;
    base_video_parse->have_sync = FALSE;
  }

  if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
    base_video_parse->last_timestamp = GST_BUFFER_TIMESTAMP (buf);
  }
  gst_adapter_push (base_video_parse->input_adapter, buf);

  if (!base_video_parse->have_sync) {
    int n, m;

    GST_DEBUG ("no sync, scanning");

    n = gst_adapter_available (base_video_parse->input_adapter);
    m = klass->scan_for_sync (base_video_parse->input_adapter, FALSE, 0, n);

    gst_adapter_flush (base_video_parse->input_adapter, m);

    if (m < n) {
      GST_DEBUG ("found possible sync after %d bytes (of %d)", m, n);

      /* this is only "maybe" sync */
      base_video_parse->have_sync = TRUE;
    }

    if (!base_video_parse->have_sync) {
      return GST_FLOW_OK;
    }
  }

  /* FIXME: use gst_adapter_prev_timestamp() here instead? */
  buffer = gst_adapter_get_buffer (base_video_parse->input_adapter);

  gst_buffer_unref (buffer);

  /* FIXME check klass->parse_data */

  do {
    ret = klass->parse_data (base_video_parse, FALSE);
  } while (ret == GST_FLOW_OK);

  if (ret == GST_BASE_VIDEO_PARSE_FLOW_NEED_DATA) {
    return GST_FLOW_OK;
  }
  return ret;
}

Example #2

File: gstbasevideoparse.c Project: zsx/ossbuild

GstFlowReturn
gst_base_video_parse_finish_frame (GstBaseVideoParse * base_video_parse)
{
  GstVideoFrame *frame = base_video_parse->current_frame;
  GstBuffer *buffer;
  GstBaseVideoParseClass *base_video_parse_class;
  GstFlowReturn ret;

  GST_DEBUG ("finish_frame");

  base_video_parse_class = GST_BASE_VIDEO_PARSE_GET_CLASS (base_video_parse);

  buffer = gst_adapter_take_buffer (base_video_parse->output_adapter,
      gst_adapter_available (base_video_parse->output_adapter));

  if (frame->is_sync_point) {
    base_video_parse->timestamp_offset = base_video_parse->last_timestamp -
        gst_util_uint64_scale (frame->presentation_frame_number,
        base_video_parse->state.fps_d * GST_SECOND,
        base_video_parse->state.fps_n);
    base_video_parse->distance_from_sync = 0;
  }

  frame->distance_from_sync = base_video_parse->distance_from_sync;
  base_video_parse->distance_from_sync++;

  frame->presentation_timestamp =
      gst_base_video_parse_get_timestamp (base_video_parse,
      frame->presentation_frame_number);
  frame->presentation_duration =
      gst_base_video_parse_get_timestamp (base_video_parse,
      frame->presentation_frame_number + 1) - frame->presentation_timestamp;
  frame->decode_timestamp =
      gst_base_video_parse_get_timestamp (base_video_parse,
      frame->decode_frame_number);

  GST_BUFFER_TIMESTAMP (buffer) = frame->presentation_timestamp;
  GST_BUFFER_DURATION (buffer) = frame->presentation_duration;
  if (frame->decode_frame_number < 0) {
    GST_BUFFER_OFFSET (buffer) = 0;
  } else {
    GST_BUFFER_OFFSET (buffer) = frame->decode_timestamp;
  }
  GST_BUFFER_OFFSET_END (buffer) = GST_CLOCK_TIME_NONE;

  GST_DEBUG ("pts %" GST_TIME_FORMAT,
      GST_TIME_ARGS (frame->presentation_timestamp));
  GST_DEBUG ("dts %" GST_TIME_FORMAT, GST_TIME_ARGS (frame->decode_timestamp));
  GST_DEBUG ("dist %d", frame->distance_from_sync);

  if (frame->is_sync_point) {
    GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  } else {
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  }

  frame->src_buffer = buffer;
  ret = base_video_parse_class->shape_output (base_video_parse, frame);

  gst_base_video_parse_free_frame (base_video_parse->current_frame);

  /* create new frame */
  base_video_parse->current_frame =
      gst_base_video_parse_new_frame (base_video_parse);

  return ret;
}