Gstreamer VideoMeta, Meta debugging 로그

Buffer의 VideoMetadata 출력 방법

static void print_video_meta_data_all(GstBuffer *buf) {
  GstVideoMeta *meta = gst_buffer_get_video_meta(buf);
  if (meta) {
    g_print("Video Meta:\n");
    g_print("  format: %s\n", gst_video_format_to_string(meta->format));
    g_print("  width: %d\n", meta->width);
    g_print("  height: %d\n", meta->height);
    g_print("  flags: %d\n", meta->flags);
    g_print("  n_planes: %d\n", meta->n_planes);
    for (guint i = 0; i < meta->n_planes; i++) {
      g_print("  stride[%d]: %d\n", i, meta->stride[i]);
      g_print("  offset[%d]: %d\n", i, meta->offset[i]);
    }
    g_print("  map: %p\n", meta->map);
    g_print("  unmap: %p\n", meta->unmap);
  }
}

Buffer의 Metadata Count 출력 및 Metadata의 Type 출력 방법

static void print_all_meta_info(GstBuffer *buf){
  GstVideoMeta *meta = gst_buffer_get_video_meta(buf);
  if (meta)
  {
    gst_print("Video Meta Count : %d\n", meta->n_planes);
  }
  GstMeta *m;
  gpointer state = NULL;
  guint meta_count = 0;
  while ((m = gst_buffer_iterate_meta(buf, &state))) {
    g_print("Metadata API type: %s\n", g_type_name(m->info->api));
    meta_count++;
  }
  g_print("Meta count: %d\n", meta_count);
}

Buffer의 모든 Metadata 중에 LOCK 상태인 Metadata 찾는 방법

static void find_lock_meta(GstBuffer *buffer) {
  GstMeta *meta;
  gpointer state = NULL;

  while ((meta = gst_buffer_iterate_meta(buffer, &state))) {
    if (GST_META_FLAG_IS_SET(meta, GST_META_FLAG_LOCKED)) {
      g_print("Found locked meta: %s\n", g_type_name(meta->info->api));
    }
  }
}