gstreamer/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapiencode_mpeg2.c

/*
 *  gstvaapiencode_mpeg2.c - VA-API MPEG2 encoder
 *
 *  Copyright (C) 2012-2014 Intel Corporation
 *    Author: Guangxin Xu <guangxin.xu@intel.com>
 *    Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1
 *  of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301 USA
 */

/**
 * SECTION:element-vaapimpeg2enc
 * @short_description: A VA-API based MPEG2 video encoder
 *
 * Encodes raw video streams into MPEG2 bitstreams.
 *
 * ## Example launch line
 *
 * |[
 *  gst-launch-1.0 -ev videotestsrc num-buffers=60 ! timeoverlay ! vaapimpeg2enc ! matroskamux ! filesink location=test.mkv
 * ]|
 */

#include "gstcompat.h"
#include <gst/vaapi/gstvaapidisplay.h>
#include <gst/vaapi/gstvaapiencoder_mpeg2.h>
#include <gst/vaapi/gstvaapiutils_mpeg2.h>
#include "gstvaapiencode_mpeg2.h"
#include "gstvaapipluginutil.h"
#include "gstvaapivideomemory.h"

#define GST_PLUGIN_NAME "vaapimpeg2enc"
#define GST_PLUGIN_DESC "A VA-API based MPEG-2 video encoder"

GST_DEBUG_CATEGORY_STATIC (gst_vaapi_mpeg2_encode_debug);
#define GST_CAT_DEFAULT gst_vaapi_mpeg2_encode_debug

#define GST_CODEC_CAPS                          \
  "video/mpeg, mpegversion = (int) 2, "         \
  "systemstream = (boolean) false"

#define EXTRA_FORMATS {}

/* mpeg2 encode */
GST_VAAPI_ENCODE_REGISTER_TYPE (mpeg2, MPEG2, Mpeg2, EXTRA_FORMATS,
    gst_vaapi_utils_mpeg2_get_profile_string);

static void
gst_vaapiencode_mpeg2_init (GstVaapiEncodeMpeg2 * encode)
{
  /* nothing to do here */
}

static void
gst_vaapiencode_mpeg2_finalize (GObject * object)
{
  G_OBJECT_CLASS (gst_vaapiencode_mpeg2_parent_class)->finalize (object);
}

static GstCaps *
gst_vaapiencode_mpeg2_get_caps (GstVaapiEncode * base_encode)
{
  GstCaps *caps;

  caps = gst_caps_from_string (GST_CODEC_CAPS);

  /* XXX: update profile and level information */
  return caps;
}

static GstVaapiEncoder *
gst_vaapiencode_mpeg2_alloc_encoder (GstVaapiEncode * base,
    GstVaapiDisplay * display)
{
  return gst_vaapi_encoder_mpeg2_new (display);
}

static void
gst_vaapiencode_mpeg2_class_init (GstVaapiEncodeMpeg2Class * klass,
    gpointer data)
{
  GObjectClass *const object_class = G_OBJECT_CLASS (klass);
  GstElementClass *const element_class = GST_ELEMENT_CLASS (klass);
  GstVaapiEncodeClass *const encode_class = GST_VAAPIENCODE_CLASS (klass);
  GstCaps *sink_caps = ((GstVaapiEncodeInitData *) data)->sink_caps;
  GstCaps *src_caps = ((GstVaapiEncodeInitData *) data)->src_caps;
  GstPadTemplate *templ;
  GstCaps *static_caps;
  gpointer encoder_class;

  object_class->finalize = gst_vaapiencode_mpeg2_finalize;
  object_class->set_property = gst_vaapiencode_set_property_subclass;
  object_class->get_property = gst_vaapiencode_get_property_subclass;

  encode_class->get_caps = gst_vaapiencode_mpeg2_get_caps;
  encode_class->alloc_encoder = gst_vaapiencode_mpeg2_alloc_encoder;

  gst_element_class_set_static_metadata (element_class,
      "VA-API MPEG-2 encoder",
      "Codec/Encoder/Video/Hardware",
      GST_PLUGIN_DESC, "Guangxin Xu <guangxin.xu@intel.com>");

  /* sink pad */
  g_assert (sink_caps);
  static_caps = gst_caps_from_string (GST_VAAPI_ENCODE_STATIC_SINK_CAPS);
  templ =
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, sink_caps);
  gst_pad_template_set_documentation_caps (templ, static_caps);
  gst_element_class_add_pad_template (element_class, templ);
  gst_caps_unref (static_caps);
  gst_caps_unref (sink_caps);

  /* src pad */
  g_assert (src_caps);
  static_caps = gst_caps_from_string (GST_CODEC_CAPS);
  templ = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, src_caps);
  gst_pad_template_set_documentation_caps (templ, static_caps);
  gst_element_class_add_pad_template (element_class, templ);
  gst_caps_unref (static_caps);
  gst_caps_unref (src_caps);

  encoder_class = g_type_class_ref (GST_TYPE_VAAPI_ENCODER_MPEG2);
  g_assert (encoder_class);
  gst_vaapiencode_class_install_properties (encode_class, encoder_class);
  g_type_class_unref (encoder_class);
}