gstreamer/ext/mpeg2enc/gstmpeg2enc.cc

/* GStreamer mpeg2enc (mjpegtools) wrapper
 * (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
 *
 * gstmpeg2enc.cc: gstreamer wrapping
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "gstmpeg2enc.hh"

/*
 * We can't use fractions in static pad templates, so
 * we do something manual...
 */
static void
add_fps (GstCaps *caps)
{
  GstStructure *structure = gst_caps_get_structure (caps, 0);
  GValue list = { 0 }, fps = { 0 };
  gdouble fpss[] = { 24.0/1.001, 24.0, 25.0,
		     30.0/1.001, 30.0, 50.0,
		     60.0/1.001, 60.0, 0 };
  guint n;

  g_value_init (&list, GST_TYPE_LIST);
  g_value_init (&fps, G_TYPE_DOUBLE);
  for (n = 0; fpss[n] != 0; n++) {
    g_value_set_double (&fps, fpss[n]);
    gst_value_list_append_value (&list, &fps);
  }
  gst_structure_set_value (structure, "framerate", &list);
  g_value_unset (&list);
  g_value_unset (&fps);
}

static GstPadTemplate *
sink_templ (void)
{
  static GstPadTemplate *templ = NULL;

  if (!templ) {
    GstCaps *caps;

    caps = gst_caps_new_simple ("video/x-raw-yuv",
				"format", GST_TYPE_FOURCC,
					GST_MAKE_FOURCC ('I','4','2','0'),
				"width",  GST_TYPE_INT_RANGE, 16, 4096,
				"height", GST_TYPE_INT_RANGE, 16, 4096,
				NULL);
    add_fps (caps);

    templ = gst_pad_template_new ("sink", GST_PAD_SINK,
				  GST_PAD_ALWAYS, caps);
  }

  return templ;
}

static GstPadTemplate *
src_templ (void)
{
  static GstPadTemplate *templ = NULL;

  if (!templ) {
    GstCaps *caps;

    caps = gst_caps_new_simple ("video/mpeg",
				"systemstream", G_TYPE_BOOLEAN, FALSE,
				"mpegversion", GST_TYPE_INT_RANGE, 1, 2,
				"width",  GST_TYPE_INT_RANGE, 16, 4096,
				"height", GST_TYPE_INT_RANGE, 16, 4096,
				NULL);
    add_fps (caps);

    templ = gst_pad_template_new ("src", GST_PAD_SRC,
				  GST_PAD_ALWAYS, caps);
  }

  return templ;
}

static void gst_mpeg2enc_base_init    (GstMpeg2encClass *klass);
static void gst_mpeg2enc_class_init   (GstMpeg2encClass *klass);
static void gst_mpeg2enc_init         (GstMpeg2enc  *enc);
static void gst_mpeg2enc_dispose      (GObject      *object);

static void gst_mpeg2enc_loop         (GstElement   *element);

static GstPadLinkReturn
            gst_mpeg2enc_sink_link    (GstPad       *pad,
				       const GstCaps *caps);

static GstElementStateReturn
            gst_mpeg2enc_change_state (GstElement  *element);

static void gst_mpeg2enc_get_property (GObject      *object,
				       guint         prop_id, 	
				       GValue       *value,
				       GParamSpec   *pspec);
static void gst_mpeg2enc_set_property (GObject      *object,
				       guint         prop_id, 	
				       const GValue *value,
				       GParamSpec   *pspec);

static GstElementClass *parent_class = NULL;

GType
gst_mpeg2enc_get_type (void)
{
  static GType gst_mpeg2enc_type = 0;

  if (!gst_mpeg2enc_type) {
    static const GTypeInfo gst_mpeg2enc_info = {
      sizeof (GstMpeg2encClass),      
      (GBaseInitFunc) gst_mpeg2enc_base_init,
      NULL,
      (GClassInitFunc) gst_mpeg2enc_class_init,
      NULL,
      NULL,
      sizeof (GstMpeg2enc),
      0,
      (GInstanceInitFunc) gst_mpeg2enc_init,
    };

    gst_mpeg2enc_type =
	g_type_register_static (GST_TYPE_ELEMENT,
				"GstMpeg2enc",
				&gst_mpeg2enc_info,
				(GTypeFlags) 0);
  }

  return gst_mpeg2enc_type;
}

static void
gst_mpeg2enc_base_init (GstMpeg2encClass *klass)
{
  static GstElementDetails gst_mpeg2enc_details = {
    "mpeg2enc video encoder",
    "Codec/Video/Encoder",
    "High-quality MPEG-1/2 video encoder",
    "Andrew Stevens <andrew.stevens@nexgo.de>\n"
    "Ronald Bultje <rbultje@ronald.bitfreak.net>"
  };
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class, src_templ ());
  gst_element_class_add_pad_template (element_class, sink_templ ());
  gst_element_class_set_details (element_class,
				 &gst_mpeg2enc_details);
}

static void
gst_mpeg2enc_class_init (GstMpeg2encClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  parent_class = GST_ELEMENT_CLASS (g_type_class_ref (GST_TYPE_ELEMENT));

  /* register arguments */
  mjpeg_default_handler_verbosity (0);
  GstMpeg2EncOptions::initProperties (object_class);

  object_class->set_property = gst_mpeg2enc_set_property;
  object_class->get_property = gst_mpeg2enc_get_property;

  object_class->dispose = gst_mpeg2enc_dispose;

  element_class->change_state = gst_mpeg2enc_change_state;
}

static void
gst_mpeg2enc_dispose (GObject *object)
{
  GstMpeg2enc *enc = GST_MPEG2ENC (object);

  if (enc->encoder) {
    delete enc->encoder;
    enc->encoder = NULL;
  }
  delete enc->options;
}

static void
gst_mpeg2enc_init (GstMpeg2enc *enc)
{
  GstElement *element = GST_ELEMENT (enc);
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);

  enc->sinkpad = gst_pad_new_from_template (
	gst_element_class_get_pad_template (klass, "sink"), "sink");
  gst_pad_set_link_function (enc->sinkpad, gst_mpeg2enc_sink_link);
  gst_element_add_pad (element, enc->sinkpad);

  enc->srcpad = gst_pad_new_from_template (
	gst_element_class_get_pad_template (klass, "src"), "src");
  gst_pad_use_explicit_caps (enc->srcpad);
  gst_element_add_pad (element, enc->srcpad);

  enc->options = new GstMpeg2EncOptions ();

  gst_element_set_loop_function (element, gst_mpeg2enc_loop);

  enc->encoder = NULL;
}

static void
gst_mpeg2enc_loop (GstElement *element)
{
  GstMpeg2enc *enc = GST_MPEG2ENC (element);

  if (!enc->encoder) {
    const GstCaps *caps;
    GstCaps *othercaps;
    GstData *data;

    /* make sure we've had data */
    data = gst_pad_pull (enc->sinkpad);
    gst_pad_set_element_private (enc->sinkpad, data);

    if (!(caps = GST_PAD_CAPS (enc->sinkpad))) {
      gst_element_error (element,
			 "No format given by previous element");
      return;
    }

    /* create new encoder with these settings */
    enc->encoder = new GstMpeg2Encoder (enc->options, enc->sinkpad,
					caps, enc->srcpad);

    /* and set caps on other side */
    othercaps = enc->encoder->getFormat ();
    if (gst_pad_set_explicit_caps (enc->srcpad, othercaps) <= 0) {
      gst_element_error (element,
			 "Failed to set up encoder properly");
      delete enc->encoder;
      enc->encoder = NULL;
      return;
    }
  }

  enc->encoder->encodePicture ();
}

static GstPadLinkReturn
gst_mpeg2enc_sink_link (GstPad        *pad,
			const GstCaps *caps)
{
  GstMpeg2enc *enc = GST_MPEG2ENC (gst_pad_get_parent (pad));

  if (!gst_caps_is_fixed (caps))
    return GST_PAD_LINK_DELAYED;

  if (enc->encoder) {
    delete enc->encoder;
    enc->encoder = NULL;
  }

  return GST_PAD_LINK_OK;
}

static void
gst_mpeg2enc_get_property (GObject    *object,
			   guint       prop_id, 	
			   GValue     *value,
			   GParamSpec *pspec)
{
  GST_MPEG2ENC (object)->options->getProperty (prop_id, value);
}

static void
gst_mpeg2enc_set_property (GObject      *object,
			   guint         prop_id, 	
			   const GValue *value,
			   GParamSpec   *pspec)
{
  GST_MPEG2ENC (object)->options->setProperty (prop_id, value);
}

static GstElementStateReturn
gst_mpeg2enc_change_state (GstElement  *element)
{
  GstMpeg2enc *enc = GST_MPEG2ENC (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_PAUSED_TO_READY:
      delete enc->encoder;
      enc->encoder = NULL;
      break;
    default:
      break;
  }

  if (parent_class->change_state)
    return parent_class->change_state (element);

  return GST_STATE_SUCCESS;
}

static gboolean
plugin_init (GstPlugin *plugin)
{
  return gst_element_register (plugin, "mpeg2enc",
			       GST_RANK_NONE,
			       GST_TYPE_MPEG2ENC);
}

GST_PLUGIN_DEFINE (
  GST_VERSION_MAJOR,
  GST_VERSION_MINOR,
  "mpeg2enc",
  "High-quality MPEG-1/2 video encoder",
  plugin_init,
  VERSION,
  "GPL",
  GST_PACKAGE,
  GST_ORIGIN
)