gstreamer/ext/libmng/gstmngenc.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * Filter:
 * Copyright (C) 2000 Donald A. Graft
 *
 * 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 <string.h>
#include <gst/gst.h>
#include "gstmngenc.h"
#include <gst/video/video.h>

#define MAX_HEIGHT              4096


GstElementDetails gst_mngenc_details = {
  "MNG encoder",
  "Codec/Encoder/Image",
  "Encode a video frame to an .mng video",
  "Wim Taymans <wim@fluendo.com>",
};


/* Filter signals and args */
enum
{
  /* FILL ME */
  LAST_SIGNAL
};

#define DEFAULT_SNAPSHOT        TRUE

enum
{
  ARG_0,
  ARG_SNAPSHOT,
  ARG_NEWMEDIA
};

static void gst_mngenc_base_init (gpointer g_class);
static void gst_mngenc_class_init (GstMngEncClass * klass);
static void gst_mngenc_init (GstMngEnc * mngenc);
static void gst_mngenc_set_property (GObject * object,
    guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_mngenc_get_property (GObject * object,
    guint prop_id, GValue * value, GParamSpec * pspec);

static void gst_mngenc_chain (GstPad * pad, GstData * _data);

GstPadTemplate *mngenc_src_template, *mngenc_sink_template;

static GstElementClass *parent_class = NULL;


GType
gst_mngenc_get_type (void)
{
  static GType mngenc_type = 0;

  if (!mngenc_type) {
    static const GTypeInfo mngenc_info = {
      sizeof (GstMngEncClass),
      gst_mngenc_base_init,
      NULL,
      (GClassInitFunc) gst_mngenc_class_init,
      NULL,
      NULL,
      sizeof (GstMngEnc),
      0,
      (GInstanceInitFunc) gst_mngenc_init,
    };

    mngenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstMngEnc",
        &mngenc_info, 0);
  }
  return mngenc_type;
}

static GstCaps *
mng_caps_factory (void)
{
  return gst_caps_new_simple ("video/x-mng",
      "width", GST_TYPE_INT_RANGE, 16, 4096,
      "height", GST_TYPE_INT_RANGE, 16, 4096,
      "framerate", GST_TYPE_DOUBLE_RANGE, 0.0, G_MAXDOUBLE, NULL);
}


static GstCaps *
raw_caps_factory (void)
{
  return gst_caps_from_string (GST_VIDEO_CAPS_RGB);
}

static void
gst_mngenc_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
  GstCaps *raw_caps, *mng_caps;

  raw_caps = raw_caps_factory ();
  mng_caps = mng_caps_factory ();

  mngenc_sink_template = gst_pad_template_new ("sink", GST_PAD_SINK,
      GST_PAD_ALWAYS, raw_caps);

  mngenc_src_template = gst_pad_template_new ("src", GST_PAD_SRC,
      GST_PAD_ALWAYS, mng_caps);

  gst_element_class_add_pad_template (element_class, mngenc_sink_template);
  gst_element_class_add_pad_template (element_class, mngenc_src_template);
  gst_element_class_set_details (element_class, &gst_mngenc_details);
}

static void
gst_mngenc_class_init (GstMngEncClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
      g_param_spec_boolean ("snapshot", "Snapshot",
          "Send EOS after encoding a frame, useful for snapshots",
          DEFAULT_SNAPSHOT, (GParamFlags) G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, ARG_NEWMEDIA,
      g_param_spec_boolean ("newmedia", "newmedia",
          "Send new media discontinuity after encoding each frame",
          FALSE, (GParamFlags) G_PARAM_READWRITE));

  gstelement_class->get_property = gst_mngenc_get_property;
  gstelement_class->set_property = gst_mngenc_set_property;
}


static GstPadLinkReturn
gst_mngenc_sinklink (GstPad * pad, const GstCaps * caps)
{
  GstMngEnc *mngenc;
  gdouble fps;
  GstStructure *structure;
  GstPadLinkReturn result;

  mngenc = GST_MNGENC (gst_pad_get_parent (pad));

  structure = gst_caps_get_structure (caps, 0);
  gst_structure_get_int (structure, "width", &mngenc->width);
  gst_structure_get_int (structure, "height", &mngenc->height);
  gst_structure_get_double (structure, "framerate", &fps);
  gst_structure_get_int (structure, "bpp", &mngenc->bpp);

  caps = gst_caps_new_simple ("video/x-mng",
      "framerate", G_TYPE_DOUBLE, fps,
      "width", G_TYPE_INT, mngenc->width,
      "height", G_TYPE_INT, mngenc->height, NULL);

  result = gst_pad_try_set_caps (mngenc->srcpad, caps);
  gst_object_unref (mngenc);

  return result;
}

static void
gst_mngenc_init (GstMngEnc * mngenc)
{
  mngenc->sinkpad = gst_pad_new_from_template (mngenc_sink_template, "sink");
  gst_element_add_pad (GST_ELEMENT (mngenc), mngenc->sinkpad);

  mngenc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
  gst_element_add_pad (GST_ELEMENT (mngenc), mngenc->srcpad);

  gst_pad_set_chain_function (mngenc->sinkpad, gst_mngenc_chain);
  gst_pad_set_link_function (mngenc->sinkpad, gst_mngenc_sinklink);

  mngenc->snapshot = DEFAULT_SNAPSHOT;
  mngenc->newmedia = FALSE;
}

static void
gst_mngenc_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstMngEnc *mngenc;

  mngenc = GST_MNGENC (gst_pad_get_parent (pad));

  /* FIXME, do something here */

  gst_buffer_unref (buf);
  gst_object_unref (mngenc);
}


static void
gst_mngenc_get_property (GObject * object,
    guint prop_id, GValue * value, GParamSpec * pspec)
{
  GstMngEnc *mngenc;

  mngenc = GST_MNGENC (object);

  switch (prop_id) {
    case ARG_SNAPSHOT:
      g_value_set_boolean (value, mngenc->snapshot);
      break;
    case ARG_NEWMEDIA:
      g_value_set_boolean (value, mngenc->newmedia);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}


static void
gst_mngenc_set_property (GObject * object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  GstMngEnc *mngenc;

  mngenc = GST_MNGENC (object);

  switch (prop_id) {
    case ARG_SNAPSHOT:
      mngenc->snapshot = g_value_get_boolean (value);
      break;
    case ARG_NEWMEDIA:
      mngenc->newmedia = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}