gstreamer/ext/xvid/gstxviddec.c

/* GStreamer xvid decoder plugin
 * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
 *
 * 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 <string.h>
#include "gstxviddec.h"
#include <gst/video/video.h>

/* elementfactory information */
GstElementDetails gst_xviddec_details = {
  "Xvid decoder",
  "Codec/Video/Decoder",
  "GPL",
  "Xvid decoder based on xviddecore",
  VERSION,
  "Ronald Bultje <rbultje@ronald.bitfreak.net>",
  "(C) 2003",
};

GST_PAD_TEMPLATE_FACTORY(sink_template,
  "sink",
  GST_PAD_SINK,
  GST_PAD_ALWAYS,
  GST_CAPS_NEW("xviddec_sink",
               "video/xvid",
                 NULL)
)

GST_PAD_TEMPLATE_FACTORY(src_template,
  "src",
  GST_PAD_SRC,
  GST_PAD_ALWAYS,
  GST_CAPS_NEW("xviddec_src",
               "video/raw",
                 "format", GST_PROPS_LIST(
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('R','G','B',' ')),
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('I','4','2','0')),
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('I','Y','U','V')),
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('Y','U','Y','2')),
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('Y','V','Y','U')),
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('Y','V','1','2')),
                             GST_PROPS_FOURCC(GST_MAKE_FOURCC('U','Y','V','Y'))
                           ),
                 "width",  GST_PROPS_INT_RANGE(0, G_MAXINT),
                 "height", GST_PROPS_INT_RANGE(0, G_MAXINT),
                 NULL)
)


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

enum {
  ARG_0
  /* FILL ME */
};


static void             gst_xviddec_class_init   (GstXvidDecClass *klass);
static void             gst_xviddec_init         (GstXvidDec      *xviddec);
static void             gst_xviddec_dispose      (GObject         *object);
static void             gst_xviddec_chain        (GstPad          *pad,
                                                  GstBuffer       *buf);
static GstPadLinkReturn gst_xviddec_connect      (GstPad          *pad,
                                                  GstCaps         *vscapslist);

static GstElementClass *parent_class = NULL;
/* static guint gst_xviddec_signals[LAST_SIGNAL] = { 0 }; */


GType
gst_xviddec_get_type(void)
{
  static GType xviddec_type = 0;

  if (!xviddec_type)
  {
    static const GTypeInfo xviddec_info = {
      sizeof(GstXvidDecClass),
      NULL,
      NULL,
      (GClassInitFunc) gst_xviddec_class_init,
      NULL,
      NULL,
      sizeof(GstXvidDec),
      0,
      (GInstanceInitFunc) gst_xviddec_init,
    };
    xviddec_type = g_type_register_static(GST_TYPE_ELEMENT,
                                          "GstXvidDec",
                                          &xviddec_info, 0);
  }
  return xviddec_type;
}


static void
gst_xviddec_class_init (GstXvidDecClass *klass)
{
  GObjectClass *gobject_class = (GObjectClass *) klass;

  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);

  gobject_class->dispose = gst_xviddec_dispose;
}


static void
gst_xviddec_init (GstXvidDec *xviddec)
{
  /* create the sink pad */
  xviddec->sinkpad = gst_pad_new_from_template(
                       GST_PAD_TEMPLATE_GET(sink_template),
                       "sink");
  gst_element_add_pad(GST_ELEMENT(xviddec), xviddec->sinkpad);

  gst_pad_set_chain_function(xviddec->sinkpad, gst_xviddec_chain);
  gst_pad_set_link_function(xviddec->sinkpad, gst_xviddec_connect);

  /* create the src pad */
  xviddec->srcpad = gst_pad_new_from_template(
                      GST_PAD_TEMPLATE_GET(src_template),
                      "src");
  gst_element_add_pad(GST_ELEMENT(xviddec), xviddec->srcpad);

  /* bitrate, etc. */
  xviddec->width = xviddec->height = xviddec->csp = -1;

  /* set xvid handle to NULL */
  xviddec->handle = NULL;
}


static void
gst_xviddec_unset (GstXvidDec *xviddec)
{
  /* unref this instance */
  xvid_decore(xviddec->handle, XVID_DEC_DESTROY, NULL, NULL);
  xviddec->handle = NULL;
}


static gboolean
gst_xviddec_setup (GstXvidDec *xviddec)
{
  XVID_DEC_PARAM xdec;
  int ret;

  /* initialise parameters, see xvid documentation */
  memset(&xdec, 0, sizeof(XVID_DEC_PARAM));
  xdec.width = xviddec->width;
  xdec.height = xviddec->height;

  if ((ret = xvid_decore(NULL, XVID_DEC_CREATE,
                         &xdec, NULL)) != XVID_ERR_OK) {
    gst_element_error(GST_ELEMENT(xviddec),
		      "Setting parameters %dx%d@%d failed: %s (%d)",
	              xviddec->width, xviddec->height, xviddec->csp,
		      gst_xvid_error(ret), ret);
    return FALSE;
  }

  xviddec->handle = xdec.handle;

  return TRUE;
}


static void
gst_xviddec_dispose (GObject *object)
{
  GstXvidDec *xviddec = GST_XVIDDEC(object);

  gst_xviddec_unset(xviddec);
}


static void
gst_xviddec_chain (GstPad    *pad,
                   GstBuffer *buf)
{
  GstXvidDec *xviddec;
  GstBuffer *outbuf;
  XVID_DEC_FRAME xframe;
  int ret;

  g_return_if_fail(pad != NULL);
  g_return_if_fail(GST_IS_PAD(pad));
  g_return_if_fail(buf != NULL);

  xviddec = GST_XVIDDEC(GST_OBJECT_PARENT(pad));

  if (!xviddec->handle) {
    gst_element_error(GST_ELEMENT(xviddec),
                      "No format set - aborting");
    gst_buffer_unref(buf);
    return;
  }

  outbuf = gst_buffer_new_and_alloc(xviddec->width *
                                    xviddec->height *
                                    xviddec->bpp / 8);
  GST_BUFFER_TIMESTAMP(outbuf) = GST_BUFFER_TIMESTAMP(buf);
  GST_BUFFER_SIZE(outbuf) = xviddec->width *
                            xviddec->height *
                            xviddec->bpp / 8;

  /* encode and so ... */
  xframe.bitstream = (void *) GST_BUFFER_DATA(buf);
  xframe.image = (void *) GST_BUFFER_DATA(outbuf);
  xframe.length = GST_BUFFER_SIZE(buf);
  xframe.stride = xviddec->width * xviddec->bpp / 8;
  xframe.colorspace = xviddec->csp;

  if ((ret = xvid_decore(xviddec->handle, XVID_DEC_DECODE,
                         &xframe, NULL))) {
    gst_element_error(GST_ELEMENT(xviddec),
                      "Error decoding xvid frame: %s (%d)\n",
		      gst_xvid_error(ret), ret);
    gst_buffer_unref(buf);
    return;
  }

  gst_pad_push(xviddec->srcpad, outbuf);
  gst_buffer_unref(buf);
}


static GstPadLinkReturn
gst_xviddec_connect (GstPad  *pad,
                     GstCaps *vscaps)
{
  GstXvidDec *xviddec;
  GstCaps *caps;
  struct {
    guint32 fourcc;
    gint    depth, bpp;
    gint    csp;
  } fmt_list[] = {
    { GST_MAKE_FOURCC('Y','U','Y','V'), 16, 16, XVID_CSP_YUY2   },
    { GST_MAKE_FOURCC('U','Y','V','Y'), 16, 16, XVID_CSP_UYVY   },
    { GST_MAKE_FOURCC('Y','V','Y','U'), 16, 16, XVID_CSP_YVYU   },
    { GST_MAKE_FOURCC('I','4','2','0'), 12, 12, XVID_CSP_I420   },
    { GST_MAKE_FOURCC('I','Y','U','V'), 12, 12, XVID_CSP_I420   },
    { GST_MAKE_FOURCC('Y','V','1','2'), 12, 12, XVID_CSP_YV12   },
    { GST_MAKE_FOURCC('R','G','B',' '), 32, 32, XVID_CSP_RGB32  },
    { GST_MAKE_FOURCC('R','G','B',' '), 24, 24, XVID_CSP_RGB24  },
    { GST_MAKE_FOURCC('R','G','B',' '), 16, 16, XVID_CSP_RGB555 },
    { GST_MAKE_FOURCC('R','G','B',' '), 15, 16, XVID_CSP_RGB565 },
    { 0, 0, 0 }
  };
  gint i;

  xviddec = GST_XVIDDEC(gst_pad_get_parent (pad));

  /* if there's something old around, remove it */
  if (xviddec->handle) {
    gst_xviddec_unset(xviddec);
  }

  /* we are not going to act on variable caps */
  if (!GST_CAPS_IS_FIXED(vscaps))
    return GST_PAD_LINK_DELAYED;

  /* if we get here, we know the input is xvid. we
   * only need to bother with the output colorspace */
  gst_caps_get_int(vscaps, "width", &xviddec->width);
  gst_caps_get_int(vscaps, "height", &xviddec->height);

  for (i = 0; fmt_list[i].fourcc != 0; i++) {
    xviddec->csp = fmt_list[i].csp;

    /* try making a caps to set on the other side */
    if (fmt_list[i].fourcc == GST_MAKE_FOURCC('R','G','B',' ')) {
      guint32 r_mask = 0, b_mask = 0, g_mask = 0;
      switch (fmt_list[i].depth) {
        case 15:
          r_mask = 0xf800; g_mask = 0x07c0; b_mask = 0x003e;
          break;
        case 16:
          r_mask = 0xf800; g_mask = 0x07e0; b_mask = 0x001f;
          break;
        case 24:
          r_mask = 0xff0000; g_mask = 0x00ff00; b_mask = 0x0000ff;
          break;
        case 32:
          r_mask = 0xff000000; g_mask = 0x00ff0000; b_mask = 0x0000ff00;
          break;
      }
      caps = GST_CAPS_NEW("xviddec_src_pad_rgb",
                          "video/raw",
                            "width",      GST_PROPS_INT(xviddec->width),
                            "height",     GST_PROPS_INT(xviddec->height),
                            "format",     GST_PROPS_FOURCC(fmt_list[i].fourcc),
                            "depth",      GST_PROPS_INT(fmt_list[i].depth),
                            "bpp",        GST_PROPS_INT(fmt_list[i].bpp),
                            "endianness", GST_PROPS_INT(G_BYTE_ORDER),
                            "red_mask",   GST_PROPS_INT(r_mask),
                            "green_mask", GST_PROPS_INT(g_mask),
                            "blue_mask",  GST_PROPS_INT(b_mask),
                            NULL);
    } else {
      caps = GST_CAPS_NEW("xviddec_src_pad_yuv",
                          "video/raw",
                            "width",      GST_PROPS_INT(xviddec->width),
                            "height",     GST_PROPS_INT(xviddec->height),
                            "format",     GST_PROPS_FOURCC(fmt_list[i].fourcc),
                            NULL);
    }

    if (gst_pad_try_set_caps(xviddec->srcpad, caps) > 0) {
      xviddec->csp = fmt_list[i].csp;
      xviddec->bpp = fmt_list[i].bpp;
      if (gst_xviddec_setup(xviddec))
        return GST_PAD_LINK_OK;
    }
  }

  /* if we got here - it's not good */
  return GST_PAD_LINK_REFUSED;
}


gboolean
gst_xviddec_plugin_init (GModule   *module,
                         GstPlugin *plugin)
{
  GstElementFactory *factory;

  /* create an elementfactory for the v4lmjpegsrcparse element */
  factory = gst_element_factory_new("xviddec", GST_TYPE_XVIDDEC,
                                    &gst_xviddec_details);
  g_return_val_if_fail(factory != NULL, FALSE);

  /* add pad templates */
  gst_element_factory_add_pad_template(factory,
    GST_PAD_TEMPLATE_GET(sink_template));
  gst_element_factory_add_pad_template(factory,
    GST_PAD_TEMPLATE_GET(src_template));

  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));

  gst_element_factory_set_rank(factory, GST_ELEMENT_RANK_PRIMARY);

  return TRUE;
}