C++ (Cpp) gst_pb_utils_add_codec_description_to_tag_list示例

示例#1

文件： gstpngparse.c 项目： asrashley/gst-plugins-bad

static GstFlowReturn
gst_png_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
  GstPngParse *pngparse = GST_PNG_PARSE (parse);

  if (!pngparse->sent_codec_tag) {
    GstTagList *taglist;
    GstCaps *caps;

    /* codec tag */
    caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (parse));
    if (G_UNLIKELY (caps == NULL)) {
      if (GST_PAD_IS_FLUSHING (GST_BASE_PARSE_SRC_PAD (parse))) {
        GST_INFO_OBJECT (parse, "Src pad is flushing");
        return GST_FLOW_FLUSHING;
      } else {
        GST_INFO_OBJECT (parse, "Src pad is not negotiated!");
        return GST_FLOW_NOT_NEGOTIATED;
      }
    }

    taglist = gst_tag_list_new_empty ();
    gst_pb_utils_add_codec_description_to_tag_list (taglist,
        GST_TAG_VIDEO_CODEC, caps);
    gst_caps_unref (caps);

    gst_base_parse_merge_tags (parse, taglist, GST_TAG_MERGE_REPLACE);
    gst_tag_list_unref (taglist);

    /* also signals the end of first-frame processing */
    pngparse->sent_codec_tag = TRUE;
  }

  return GST_FLOW_OK;
}

示例#2

文件： gstdiracparse.c 项目： ndufresne/gst-plugins-bad

static GstFlowReturn
gst_dirac_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
    GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);

    if (!diracparse->sent_codec_tag) {
        GstTagList *taglist;
        GstCaps *caps;

        taglist = gst_tag_list_new_empty ();

        /* codec tag */
        caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (parse));
        gst_pb_utils_add_codec_description_to_tag_list (taglist,
                GST_TAG_VIDEO_CODEC, caps);
        gst_caps_unref (caps);

        gst_base_parse_merge_tags (parse, taglist, GST_TAG_MERGE_REPLACE);
        gst_tag_list_unref (taglist);

        /* also signals the end of first-frame processing */
        diracparse->sent_codec_tag = TRUE;
    }

    return GST_FLOW_OK;
}

示例#3

文件： gstpngparse.c 项目： Distrotech/gst-plugins-bad

static GstFlowReturn
gst_png_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
  GstPngParse *pngparse = GST_PNG_PARSE (parse);

  if (!pngparse->sent_codec_tag) {
    GstTagList *taglist;
    GstCaps *caps;

    taglist = gst_tag_list_new_empty ();

    /* codec tag */
    caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (parse));
    gst_pb_utils_add_codec_description_to_tag_list (taglist,
        GST_TAG_VIDEO_CODEC, caps);
    gst_caps_unref (caps);

    gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (pngparse),
        gst_event_new_tag (taglist));

    /* also signals the end of first-frame processing */
    pngparse->sent_codec_tag = TRUE;
  }

  return GST_FLOW_OK;
}

示例#4

文件： gstid3demux.c 项目： dgerlach/gst-plugins-good

static void
gst_id3demux_add_container_format (GstTagList * tags)
{
  GstCaps *sink_caps;

  sink_caps = gst_static_pad_template_get_caps (&sink_factory);
  gst_pb_utils_add_codec_description_to_tag_list (tags,
      GST_TAG_CONTAINER_FORMAT, sink_caps);
  gst_caps_unref (sink_caps);
}

示例#5

文件： gstapedemux.c 项目： freedesktop-unofficial-mirror/gstreamer-sdk__gst-plugins-good

static GstTagDemuxResult
gst_ape_demux_parse_tag (GstTagDemux * demux, GstBuffer * buffer,
    gboolean start_tag, guint * tag_size, GstTagList ** tags)
{
  const guint8 *data;
  const guint8 *footer;
  gboolean have_header;
  gboolean end_tag = !start_tag;
  GstCaps *sink_caps;
  guint version, footer_size;

  GST_LOG_OBJECT (demux, "Parsing buffer of size %u", GST_BUFFER_SIZE (buffer));

  data = GST_BUFFER_DATA (buffer);
  footer = GST_BUFFER_DATA (buffer) + GST_BUFFER_SIZE (buffer) - 32;

  GST_LOG_OBJECT (demux, "Checking for footer at offset 0x%04x",
      (guint) (footer - data));
  if (footer > data && memcmp (footer, "APETAGEX", 8) == 0) {
    GST_DEBUG_OBJECT (demux, "Found footer");
    footer_size = 32;
  } else {
    GST_DEBUG_OBJECT (demux, "No footer");
    footer_size = 0;
  }

  /* APE tags at the end must have a footer */
  if (end_tag && footer_size == 0) {
    GST_WARNING_OBJECT (demux, "Tag at end of file without footer!");
    return GST_TAG_DEMUX_RESULT_BROKEN_TAG;
  }

  /* don't trust the header/footer flags, better detect them ourselves */
  have_header = (memcmp (data, "APETAGEX", 8) == 0);

  if (start_tag && !have_header) {
    GST_DEBUG_OBJECT (demux, "Tag at beginning of file without header!");
    return GST_TAG_DEMUX_RESULT_BROKEN_TAG;
  }

  if (end_tag && !have_header) {
    GST_DEBUG_OBJECT (demux, "Tag at end of file has no header (APEv1)");
    *tag_size -= 32;            /* adjust tag size */
  }

  if (have_header) {
    version = GST_READ_UINT32_LE (data + 8);
  } else {
    version = GST_READ_UINT32_LE (footer + 8);
  }

  /* skip header */
  if (have_header) {
    data += 32;
  }

  GST_DEBUG_OBJECT (demux, "APE tag with version %u, size %u at offset 0x%08"
      G_GINT64_MODIFIER "x", version, *tag_size,
      GST_BUFFER_OFFSET (buffer) + ((have_header) ? 0 : 32));

  if (APE_VERSION_MAJOR (version) != 1 && APE_VERSION_MAJOR (version) != 2) {
    GST_WARNING ("APE tag is version %u.%03u, but decoder only supports "
        "v1 or v2. Ignoring.", APE_VERSION_MAJOR (version), version % 1000);
    return GST_TAG_DEMUX_RESULT_OK;
  }

  *tags = ape_demux_parse_tags (data, *tag_size - footer_size);

  sink_caps = gst_static_pad_template_get_caps (&sink_factory);
  gst_pb_utils_add_codec_description_to_tag_list (*tags,
      GST_TAG_CONTAINER_FORMAT, sink_caps);
  gst_caps_unref (sink_caps);

  return GST_TAG_DEMUX_RESULT_OK;
}