125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/* GStreamer
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* Copyright (C) 2016 William Manley <will@williammanley.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION:element-gstklvinspect
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*
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* The klvinspect element inspects KLV metadata on passing buffers.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch -v fakesrc ! klvinspect ! fakesink
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* ]|
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* FIXME Describe what the pipeline does.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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#include "gstklvinspect.h"
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#include "klv.h"
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GST_DEBUG_CATEGORY_STATIC (gst_klvinspect_debug_category);
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#define GST_CAT_DEFAULT gst_klvinspect_debug_category
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/* prototypes */
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static GstFlowReturn gst_klvinspect_transform_ip (GstBaseTransform * trans,
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GstBuffer * buf);
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enum
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{
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PROP_0
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};
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/* pad templates */
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#define SRC_CAPS "ANY"
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#define SINK_CAPS "ANY"
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/* class initialization */
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G_DEFINE_TYPE_WITH_CODE (GstKlvInspect, gst_klvinspect, GST_TYPE_BASE_TRANSFORM,
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GST_DEBUG_CATEGORY_INIT (gst_klvinspect_debug_category, "klvinspect", 0,
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"debug category for klvinspect element"));
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static void
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gst_klvinspect_class_init (GstKlvInspectClass * klass)
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{
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GstBaseTransformClass *base_transform_class =
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GST_BASE_TRANSFORM_CLASS (klass);
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/* Setting up pads and setting metadata should be moved to
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base_class_init if you intend to subclass this class. */
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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gst_caps_from_string (SRC_CAPS)));
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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gst_caps_from_string (SINK_CAPS)));
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Inspect KLV", "Filter", "Inspect KLV metadata",
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"Joshua M. Doe <oss@nvl.army.mil>");
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base_transform_class->transform_ip =
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GST_DEBUG_FUNCPTR (gst_klvinspect_transform_ip);
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base_transform_class->passthrough_on_same_caps = TRUE;
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base_transform_class->transform_ip_on_passthrough = TRUE;
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}
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static void
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gst_klvinspect_init (GstKlvInspect * filt)
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{
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}
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static void
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gst_klvinspect_dispose (GstKlvInspect * filt)
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{
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}
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static GstFlowReturn
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gst_klvinspect_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstKlvInspect *filt = GST_KLVINSPECT (trans);
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GstKLVMeta *klv_meta;
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gpointer iter = NULL;
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gint n_klv_meta_found = 0;
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while ((klv_meta = (GstKLVMeta *) gst_buffer_iterate_meta_filtered (buf,
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&iter, GST_KLV_META_API_TYPE))) {
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gsize klv_size;
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const guint8 *klv_data;
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klv_data = gst_klv_meta_get_data (klv_meta, &klv_size);
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if (klv_data) {
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GST_MEMDUMP_OBJECT (filt, "KLV data", klv_data, (guint) klv_size);
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++n_klv_meta_found;
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}
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}
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GST_LOG_OBJECT (filt, "Found %d KLV meta", n_klv_meta_found);
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return GST_FLOW_OK;
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}
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