theoradec.c 27.5 KB
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/* GStreamer
 * Copyright (C) 2004 Benjamin Otte <in7y118@public.uni-hamburg.de>
 *
 * 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 <gst/gst.h>
#include <theora/theora.h>
#include <string.h>
#include <gst/tag/tag.h>

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GST_DEBUG_CATEGORY (theoradec_debug);
#define GST_CAT_DEFAULT theoradec_debug
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#define GST_TYPE_THEORA_DEC \
  (gst_theora_dec_get_type())
#define GST_THEORA_DEC(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_THEORA_DEC,GstTheoraDec))
#define GST_THEORA_DEC_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_THEORA_DEC,GstTheoraDec))
#define GST_IS_THEORA_DEC(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_THEORA_DEC))
#define GST_IS_THEORA_DEC_CLASS(obj) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_THEORA_DEC))

typedef struct _GstTheoraDec GstTheoraDec;
typedef struct _GstTheoraDecClass GstTheoraDecClass;

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struct _GstTheoraDec
{
  GstElement element;

  GstPad *sinkpad;
  GstPad *srcpad;

  theora_state state;
  theora_info info;
  theora_comment comment;

  guint packetno;
  guint64 granulepos;
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  gboolean initialized;
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  gboolean need_keyframe;
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  gint width, height;
  gint offset_x, offset_y;
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  gboolean crop;
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  GList *queued;
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};

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struct _GstTheoraDecClass
{
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  GstElementClass parent_class;
};

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#define THEORA_DEF_CROP		TRUE
enum
{
  ARG_0,
  ARG_CROP
};

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static GstElementDetails theora_dec_details = {
  "TheoraDec",
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  "Codec/Decoder/Video",
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  "decode raw theora streams to raw YUV video",
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  "Benjamin Otte <in7y118@public.uni-hamburg.de>, "
      "Wim Taymans <wim@fluendo.com>",
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};

static GstStaticPadTemplate theora_dec_src_factory =
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GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-raw-yuv, "
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        "format = (fourcc) I420, "
        "framerate = (double) [0, MAX], "
        "width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ]")
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    );
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static GstStaticPadTemplate theora_dec_sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-theora")
    );
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GST_BOILERPLATE (GstTheoraDec, gst_theora_dec, GstElement, GST_TYPE_ELEMENT);
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static void theora_dec_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);
static void theora_dec_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);

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static gboolean theora_dec_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn theora_dec_chain (GstPad * pad, GstBuffer * buffer);
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static GstElementStateReturn theora_dec_change_state (GstElement * element);
static gboolean theora_dec_src_event (GstPad * pad, GstEvent * event);
static gboolean theora_dec_src_query (GstPad * pad,
    GstQueryType query, GstFormat * format, gint64 * value);
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static gboolean theora_dec_src_convert (GstPad * pad,
    GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value);
static gboolean theora_dec_sink_convert (GstPad * pad,
    GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value);
static const GstFormat *theora_get_formats (GstPad * pad);
static const GstEventMask *theora_get_event_masks (GstPad * pad);
static const GstQueryType *theora_get_query_types (GstPad * pad);
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static void
gst_theora_dec_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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  gst_element_class_add_pad_template (element_class,
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      gst_static_pad_template_get (&theora_dec_src_factory));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&theora_dec_sink_factory));
  gst_element_class_set_details (element_class, &theora_dec_details);
}

static void
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gst_theora_dec_class_init (GstTheoraDecClass * klass)
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{
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  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

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  gobject_class->set_property = theora_dec_set_property;
  gobject_class->get_property = theora_dec_get_property;

  g_object_class_install_property (gobject_class, ARG_CROP,
      g_param_spec_boolean ("crop", "Crop",
          "Crop the image to the visible region", THEORA_DEF_CROP,
          (GParamFlags) G_PARAM_READWRITE));

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  gstelement_class->change_state = theora_dec_change_state;
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  GST_DEBUG_CATEGORY_INIT (theoradec_debug, "theoradec", 0, "Theora decoder");
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}

static void
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gst_theora_dec_init (GstTheoraDec * dec)
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{
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  dec->sinkpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&theora_dec_sink_factory), "sink");
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  gst_pad_set_formats_function (dec->sinkpad, theora_get_formats);
  gst_pad_set_convert_function (dec->sinkpad, theora_dec_sink_convert);
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  gst_pad_set_event_function (dec->sinkpad, theora_dec_sink_event);
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  gst_pad_set_chain_function (dec->sinkpad, theora_dec_chain);
  gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);

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  dec->srcpad =
      gst_pad_new_from_template (gst_static_pad_template_get
      (&theora_dec_src_factory), "src");
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  gst_pad_set_event_mask_function (dec->srcpad, theora_get_event_masks);
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  gst_pad_set_event_function (dec->srcpad, theora_dec_src_event);
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  gst_pad_set_query_type_function (dec->srcpad, theora_get_query_types);
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  gst_pad_set_query_function (dec->srcpad, theora_dec_src_query);
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  gst_pad_set_formats_function (dec->srcpad, theora_get_formats);
  gst_pad_set_convert_function (dec->srcpad, theora_dec_src_convert);

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  gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);

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  dec->crop = THEORA_DEF_CROP;
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  dec->queued = NULL;
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}
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/* FIXME: copy from libtheora, theora should somehow make this available for seeking */
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static int
_theora_ilog (unsigned int v)
{
  int ret = 0;

  while (v) {
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    ret++;
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    v >>= 1;
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  }
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  return (ret);
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}

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static void
_inc_granulepos (GstTheoraDec * dec)
{
  guint ilog;
  gint framecount;

  if (dec->granulepos == -1)
    return;

  ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);

  framecount = dec->granulepos >> ilog;
  framecount += dec->granulepos - (framecount << ilog);

  GST_DEBUG_OBJECT (dec, "framecount=%d, ilog=%u", framecount, ilog);

  framecount++;

  dec->granulepos = (framecount << ilog);
}

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static const GstFormat *
theora_get_formats (GstPad * pad)
{
  static GstFormat src_formats[] = {
    GST_FORMAT_DEFAULT,         /* frames in this case */
    GST_FORMAT_TIME,
    GST_FORMAT_BYTES,
    0
  };
  static GstFormat sink_formats[] = {
    GST_FORMAT_DEFAULT,
    GST_FORMAT_TIME,
    0
  };

  return (GST_PAD_IS_SRC (pad) ? src_formats : sink_formats);
}

static const GstEventMask *
theora_get_event_masks (GstPad * pad)
{
  static const GstEventMask theora_src_event_masks[] = {
    {GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH},
    {0,}
  };

  return theora_src_event_masks;
}

static const GstQueryType *
theora_get_query_types (GstPad * pad)
{
  static const GstQueryType theora_src_query_types[] = {
    GST_QUERY_TOTAL,
    GST_QUERY_POSITION,
    0
  };

  return theora_src_query_types;
}


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static gboolean
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theora_dec_src_convert (GstPad * pad,
    GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value)
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{
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  gboolean res = TRUE;
  GstTheoraDec *dec;
  guint64 scale = 1;

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  dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
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  /* we need the info part before we can done something */
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  if (dec->packetno < 1)
    return FALSE;

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  switch (src_format) {
    case GST_FORMAT_BYTES:
      switch (*dest_format) {
        case GST_FORMAT_DEFAULT:
          *dest_value =
              src_value * 2 / (dec->info.height * dec->info.width * 3);
          break;
        case GST_FORMAT_TIME:
          /* seems like a rather silly conversion, implement me if you like */
        default:
          res = FALSE;
      }
      break;
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    case GST_FORMAT_TIME:
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      switch (*dest_format) {
        case GST_FORMAT_BYTES:
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          scale = 3 * (dec->info.width * dec->info.height) / 2;
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        case GST_FORMAT_DEFAULT:
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          *dest_value =
              scale * (((guint64) src_value * dec->info.fps_numerator) /
              (dec->info.fps_denominator * GST_SECOND));
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          break;
        default:
          res = FALSE;
      }
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      break;
    case GST_FORMAT_DEFAULT:
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      switch (*dest_format) {
        case GST_FORMAT_TIME:
          *dest_value = src_value * (GST_SECOND * dec->info.fps_denominator /
              dec->info.fps_numerator);
          break;
        case GST_FORMAT_BYTES:
          *dest_value =
              src_value * 3 * (dec->info.width * dec->info.height) / 2;
          break;
        default:
          res = FALSE;
      }
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      break;
    default:
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      res = FALSE;
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  }
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  return res;
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}

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static gboolean
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theora_dec_sink_convert (GstPad * pad,
    GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 * dest_value)
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{
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  gboolean res = TRUE;
  GstTheoraDec *dec;
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  dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
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  /* we need the info part before we can done something */
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  if (dec->packetno < 1)
    return FALSE;

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  switch (src_format) {
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    case GST_FORMAT_DEFAULT:
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    {
      guint64 framecount;
      guint ilog;

      ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);

      /* granulepos is last ilog bits for counting pframes since last iframe and 
       * bits in front of that for the framenumber of the last iframe. */
      framecount = src_value >> ilog;
      framecount += src_value - (framecount << ilog);

      switch (*dest_format) {
        case GST_FORMAT_TIME:
          *dest_value = framecount * (GST_SECOND * dec->info.fps_denominator /
              dec->info.fps_numerator);
          break;
        default:
          res = FALSE;
      }
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      break;
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    }
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    case GST_FORMAT_TIME:
    {
      switch (*dest_format) {
        case GST_FORMAT_DEFAULT:
        {
          guint ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);
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          guint rest;
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          /* framecount */
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          *dest_value = src_value * dec->info.fps_numerator /
              (GST_SECOND * dec->info.fps_denominator);
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          /* funny way of calculating granulepos in theora */
          rest = *dest_value / dec->info.keyframe_frequency_force;
          *dest_value -= rest;
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          *dest_value <<= ilog;
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          *dest_value += rest;
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          break;
        }
        default:
          res = FALSE;
          break;
      }
      break;
    }
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    default:
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      res = FALSE;
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  }
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  return res;
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}
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static gboolean
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theora_dec_src_query (GstPad * pad, GstQueryType query, GstFormat * format,
    gint64 * value)
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{
  gint64 granulepos;
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  GstTheoraDec *dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
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  GstFormat my_format = GST_FORMAT_DEFAULT;
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  guint64 time;
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  if (query == GST_QUERY_POSITION) {
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    /* this is easy, we can convert a granule position to everything */
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    granulepos = dec->granulepos;
  } else {
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    /* for the total, we just forward the query to the peer */
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    return gst_pad_query (GST_PAD_PEER (dec->sinkpad), query, format, value);
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  }
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  /* and convert to the final format in two steps with time as the 
   * intermediate step */
  my_format = GST_FORMAT_TIME;
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  if (!theora_dec_sink_convert (dec->sinkpad, GST_FORMAT_DEFAULT, granulepos,
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          &my_format, &time))
    return FALSE;
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  if (!gst_pad_convert (pad, my_format, time, format, value))
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    return FALSE;

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  GST_LOG_OBJECT (dec,
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      "query %u: peer returned granulepos: %llu - we return %llu (format %u)",
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      query, granulepos, *value, *format);
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  return TRUE;
}

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static gboolean
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theora_dec_src_event (GstPad * pad, GstEvent * event)
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{
  gboolean res = TRUE;
  GstTheoraDec *dec;
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  GstFormat format;
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  dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
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  switch (GST_EVENT_TYPE (event)) {
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    case GST_EVENT_SEEK:{
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      guint64 value;
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      GstEvent *real_seek;
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      /* we have to ask our peer to seek to time here as we know
       * nothing about how to generate a granulepos from the src
       * formats or anything.
       * 
       * First bring the requested format to time 
       */
      format = GST_FORMAT_TIME;
      res = gst_pad_convert (pad, GST_EVENT_SEEK_FORMAT (event),
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          GST_EVENT_SEEK_OFFSET (event), &format, &value);
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      if (!res)
        goto error;
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      /* then seek with time on the peer */
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      real_seek = gst_event_new_seek (
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          (GST_EVENT_SEEK_TYPE (event) & ~GST_SEEK_FORMAT_MASK) |
          format, value);

      res = gst_pad_send_event (GST_PAD_PEER (dec->sinkpad), real_seek);
      if (!res)
        goto error;

      /* all worked, make sure we sync to keyframe */
      dec->need_keyframe = TRUE;

    error:
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      gst_event_unref (event);
      break;
    }
    default:
      res = gst_pad_event_default (pad, event);
      break;
  }

  return res;
}

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static gboolean
theora_dec_sink_event (GstPad * pad, GstEvent * event)
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{
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  guint64 start_value, end_value, time, bytes;
  GstTheoraDec *dec;

  dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
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  GST_LOG_OBJECT (dec, "handling event");
  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_DISCONTINUOUS:
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      if (gst_event_discont_get_value (event, GST_FORMAT_DEFAULT,
              &start_value, &end_value)) {
        dec->granulepos = start_value;
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        GST_DEBUG_OBJECT (dec,
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            "setting granuleposition to %" G_GUINT64_FORMAT " after discont",
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            start_value);
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      } else {
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        GST_WARNING_OBJECT (dec,
            "discont event didn't include offset, we might set it wrong now");
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        dec->granulepos = -1;
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      }
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      if (dec->packetno < 3) {
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        if (dec->granulepos != 0)
          GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
              ("can't handle discont before parsing first 3 packets"));
        dec->packetno = 0;
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        gst_pad_push_event (dec->srcpad, gst_event_new_discontinuous (FALSE,
                GST_FORMAT_TIME, (guint64) 0, GST_FORMAT_DEFAULT,
                (guint64) 0, GST_FORMAT_BYTES, (guint64) 0, 0));
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      } else {
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        GstFormat time_format, default_format, bytes_format;

        time_format = GST_FORMAT_TIME;
        default_format = GST_FORMAT_DEFAULT;
        bytes_format = GST_FORMAT_BYTES;

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        /* if one of them works, all of them work */
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        if (theora_dec_sink_convert (dec->sinkpad, GST_FORMAT_DEFAULT,
                dec->granulepos, &time_format, &time)
            && theora_dec_src_convert (dec->srcpad, GST_FORMAT_TIME, time,
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                &default_format, &start_value)
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            && theora_dec_src_convert (dec->srcpad, GST_FORMAT_TIME, time,
                &bytes_format, &bytes)) {
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          gst_pad_push_event (dec->srcpad,
              gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
                  time, GST_FORMAT_DEFAULT, start_value, GST_FORMAT_BYTES,
                  bytes, 0));
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          /* store new framenumber */
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          dec->packetno = start_value + 3;
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        } else {
          GST_ERROR_OBJECT (dec,
              "failed to parse data for DISCONT event, not sending any");
        }
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        /* sync to keyframe */
        dec->need_keyframe = TRUE;
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      }
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      break;
    default:
      break;
  }
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  return gst_pad_event_default (dec->sinkpad, event);
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}

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#define ROUND_UP_2(x) (((x) + 1) & ~1)
#define ROUND_UP_4(x) (((x) + 3) & ~3)
#define ROUND_UP_8(x) (((x) + 7) & ~7)

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static GstFlowReturn
theora_dec_chain (GstPad * pad, GstBuffer * buffer)
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{
  GstBuffer *buf;
  GstTheoraDec *dec;
  ogg_packet packet;
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  guint64 offset_end;
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  GstClockTime outtime;
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  GstFlowReturn result = GST_FLOW_OK;
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  dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
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  buf = GST_BUFFER (buffer);
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  if (dec->packetno >= 3) {
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    /* try timestamp first */
    outtime = GST_BUFFER_TIMESTAMP (buf);
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    if (outtime == -1) {
      gboolean need_flush = FALSE;

      /* the offset end field in theora is actually the time of
       * this frame, not the end time */
      offset_end = GST_BUFFER_OFFSET_END (buf);
      GST_DEBUG_OBJECT (dec, "got buffer with granule %lld", offset_end);

      if (offset_end != -1) {
        if (dec->granulepos == -1) {
          GST_DEBUG_OBJECT (dec, "first buffer with granule");
          need_flush = TRUE;
        }
        dec->granulepos = offset_end;
      }
      if (dec->granulepos == -1) {
        /* we need to wait for a buffer with at least a timestamp or an 
         * offset before we can generate valid timestamps */
        dec->queued = g_list_append (dec->queued, buf);
        GST_DEBUG_OBJECT (dec, "queued buffer");
        return GST_FLOW_OK;
      } else {
        /* granulepos to time */
        outtime =
            GST_SECOND * theora_granule_time (&dec->state, dec->granulepos);

        GST_DEBUG_OBJECT (dec, "granulepos=%lld outtime=%" GST_TIME_FORMAT,
            dec->granulepos, GST_TIME_ARGS (outtime));

        if (need_flush) {
          GList *walk;
          GstClockTime patch;
          gint64 len;
          gint64 old_granule = dec->granulepos;

          dec->granulepos = -1;

          len = g_list_length (dec->queued);

          GST_DEBUG_OBJECT (dec, "first buffer with granule, flushing");

          /* now resubmit all queued buffers with corrected timestamps */
          for (walk = dec->queued; walk; walk = g_list_next (walk)) {
            GstBuffer *qbuffer = GST_BUFFER (walk->data);

            patch = outtime - (GST_SECOND * len * dec->info.fps_denominator) /
                dec->info.fps_numerator,
                GST_DEBUG_OBJECT (dec, "patch buffer %lld %lld", len, patch);
            GST_BUFFER_TIMESTAMP (qbuffer) = patch;

            /* buffers are unreffed in chain function */
            theora_dec_chain (pad, qbuffer);
            len--;
          }
          g_list_free (dec->queued);
          dec->queued = NULL;

          dec->granulepos = old_granule;
        }
      }
    } else {
      GST_DEBUG_OBJECT (dec, "got buffer with timestamp %lld", outtime);
    }
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  } else {
    /* we don't know yet */
    outtime = -1;
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  }

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  /* make ogg_packet out of the buffer */
  packet.packet = GST_BUFFER_DATA (buf);
  packet.bytes = GST_BUFFER_SIZE (buf);
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  packet.granulepos = dec->granulepos;
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  packet.packetno = dec->packetno;
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  packet.b_o_s = (packet.packetno == 0) ? 1 : 0;
  packet.e_o_s = 0;
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  GST_DEBUG_OBJECT (dec, "header=%d packetno=%lld, outtime=%" GST_TIME_FORMAT,
      packet.packet[0], packet.packetno, GST_TIME_ARGS (outtime));
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  /* switch depending on packet type */
  if (packet.packet[0] & 0x80) {
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    if (packet.packetno > 3) {
      GST_WARNING_OBJECT (GST_OBJECT (dec), "Ignoring header");
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      goto done;
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    }
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    /* header packet */
    if (theora_decode_header (&dec->info, &dec->comment, &packet)) {
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      GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
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          (NULL), ("couldn't read header packet"));
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      result = GST_FLOW_ERROR;
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      goto done;
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    }
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    if (packet.packetno == 0) {
      dec->packetno++;
    } else if (packet.packetno == 1) {
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      gchar *encoder = NULL;
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      GstTagList *list =
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          gst_tag_list_from_vorbiscomment_buffer (buf, "\201theora", 7,
          &encoder);
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      if (!list) {
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        GST_ERROR_OBJECT (dec, "failed to parse tags");
        list = gst_tag_list_new ();
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      }
      if (encoder) {
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        gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
            GST_TAG_ENCODER, encoder, NULL);
        g_free (encoder);
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      }
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      gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
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          GST_TAG_ENCODER_VERSION, dec->info.version_major,
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          GST_TAG_NOMINAL_BITRATE, dec->info.target_bitrate,
          GST_TAG_VIDEO_CODEC, "Theora", NULL);
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      //gst_element_found_tags_for_pad (GST_ELEMENT (dec), dec->srcpad, 0, list);
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      dec->packetno++;
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    } else if (packet.packetno == 2) {
      GstCaps *caps;
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      gint par_num, par_den;

      GST_DEBUG_OBJECT (dec, "fps %d/%d, PAR %d/%d",
          dec->info.fps_numerator, dec->info.fps_denominator,
          dec->info.aspect_numerator, dec->info.aspect_denominator);

      /* calculate par
       * the info.aspect_* values reflect PAR;
       * 0:0 is allowed and can be interpreted as 1:1, so correct for it */
      par_num = dec->info.aspect_numerator;
      par_den = dec->info.aspect_denominator;
      if (par_num == 0 && par_den == 0) {
        par_num = par_den = 1;
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      }
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      /* theora has:
       *
       *  width/height : dimension of the encoded frame 
       *  frame_width/frame_height : dimension of the visible part
       *  offset_x/offset_y : offset in encoded frame where visible part starts
       */
      GST_DEBUG_OBJECT (dec, "dimension %dx%d, PAR %d/%d", dec->info.width,
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          dec->info.height, par_num, par_den);
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      GST_DEBUG_OBJECT (dec, "frame dimension %dx%d, offset %d:%d",
          dec->info.frame_width, dec->info.frame_height,
          dec->info.offset_x, dec->info.offset_y);
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      if (dec->crop) {
        /* add black borders to make width/height/offsets even. we need this because
         * we cannot express an offset to the peer plugin. */
        dec->width =
            ROUND_UP_2 (dec->info.frame_width + (dec->info.offset_x & 1));
        dec->height =
            ROUND_UP_2 (dec->info.frame_height + (dec->info.offset_y & 1));
        dec->offset_x = dec->info.offset_x & ~1;
        dec->offset_y = dec->info.offset_y & ~1;
      } else {
        /* no cropping, use the encoded dimensions */
        dec->width = dec->info.width;
        dec->height = dec->info.height;
        dec->offset_x = 0;
        dec->offset_y = 0;
      }
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      GST_DEBUG_OBJECT (dec, "after fixup frame dimension %dx%d, offset %d:%d",
          dec->width, dec->height, dec->offset_x, dec->offset_y);

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      /* done */
      theora_decode_init (&dec->state, &dec->info);
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      caps = gst_caps_new_simple ("video/x-raw-yuv",
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          "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
          "framerate", G_TYPE_DOUBLE,
          ((gdouble) dec->info.fps_numerator) / dec->info.fps_denominator,
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          "pixel-aspect-ratio", GST_TYPE_FRACTION, par_num, par_den,
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          "width", G_TYPE_INT, dec->width, "height", G_TYPE_INT,
          dec->height, NULL);
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      gst_pad_set_caps (dec->srcpad, caps);
      gst_caps_unref (caps);
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      dec->initialized = TRUE;
      dec->packetno++;
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    }
  } else {
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    /* normal data packet */
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    yuv_buffer yuv;
    GstBuffer *out;
    guint i;
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    gboolean keyframe;
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    gint out_size;
    gint stride_y, stride_uv;
    gint width, height;
    gint cwidth, cheight;
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    dec->packetno++;

    if (!dec->initialized) {
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      result = GST_FLOW_ERROR;
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      goto done;
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    }

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    /* the second most significant bit of the first data byte is cleared 
     * for keyframes */
    keyframe = (packet.packet[0] & 0x40) == 0;
    if (keyframe) {
      dec->need_keyframe = FALSE;
    } else if (dec->need_keyframe) {
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      GST_WARNING_OBJECT (dec, "dropping frame because we need a keyframe");
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      /* drop frames if we're looking for a keyframe */
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      goto done;
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    }
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    if (theora_decode_packetin (&dec->state, &packet)) {
      GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
          (NULL), ("theora decoder did not read data packet"));
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      result = GST_FLOW_ERROR;
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      goto done;
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    }
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    if (theora_decode_YUVout (&dec->state, &yuv) < 0) {
      GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
          (NULL), ("couldn't read out YUV image"));
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      result = GST_FLOW_ERROR;
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      goto done;
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    }
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    g_return_val_if_fail (yuv.y_width == dec->info.width, GST_FLOW_ERROR);
    g_return_val_if_fail (yuv.y_height == dec->info.height, GST_FLOW_ERROR);
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    width = dec->width;
    height = dec->height;
    cwidth = width / 2;
    cheight = height / 2;
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    /* should get the stride from the caps, for now we round up to the nearest
     * multiple of 4 because some element needs it. chroma needs special 
     * treatment, see videotestsrc. */
    stride_y = ROUND_UP_4 (width);
    stride_uv = ROUND_UP_8 (width) / 2;

    out_size = stride_y * height + stride_uv * cheight * 2;

    /* now copy over the area contained in offset_x,offset_y,
     * frame_width, frame_height */
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    out = gst_pad_alloc_buffer (dec->srcpad, GST_BUFFER_OFFSET_NONE, out_size,
        GST_PAD_CAPS (dec->srcpad));
    if (out == NULL)
      goto done;
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    /* copy the visible region to the destination. This is actually pretty
     * complicated and gstreamer doesn't support all the needed caps to do this
     * correctly. For example, when we have an odd offset, we should only combine
     * 1 row/column of luma samples with on chroma sample in colorspace conversion. 
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     * We compensate for this by adding a block border around the image when the
     * offset of size is odd (see above).
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     */
    {
      guint8 *dest_y, *src_y;
      guint8 *dest_u, *src_u;
      guint8 *dest_v, *src_v;

      dest_y = GST_BUFFER_DATA (out);
      dest_u = dest_y + stride_y * height;
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      dest_v = dest_u + stride_uv * cheight;
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      src_y = yuv.y + dec->offset_x + dec->offset_y * yuv.y_stride;
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      for (i = 0; i < height; i++) {
        memcpy (dest_y, src_y, width);

        dest_y += stride_y;
        src_y += yuv.y_stride;
      }

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      src_u = yuv.u + dec->offset_x / 2 + dec->offset_y / 2 * yuv.uv_stride;
      src_v = yuv.v + dec->offset_x / 2 + dec->offset_y / 2 * yuv.uv_stride;
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      for (i = 0; i < cheight; i++) {
        memcpy (dest_u, src_u, cwidth);
        memcpy (dest_v, src_v, cwidth);

        dest_u += stride_uv;
        src_u += yuv.uv_stride;
        dest_v += stride_uv;
        src_v += yuv.uv_stride;
      }
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    }
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    GST_BUFFER_OFFSET (out) = dec->packetno - 4;
    GST_BUFFER_OFFSET_END (out) = dec->packetno - 3;
    GST_BUFFER_DURATION (out) =
        GST_SECOND * ((gdouble) dec->info.fps_denominator) /
        dec->info.fps_numerator;
    GST_BUFFER_TIMESTAMP (out) = outtime;

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    result = gst_pad_push (dec->srcpad, out);
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  }
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done:
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  gst_buffer_unref (buffer);
  _inc_granulepos (dec);

  return result;
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}

static GstElementStateReturn
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theora_dec_change_state (GstElement * element)
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{
  GstTheoraDec *dec = GST_THEORA_DEC (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_NULL_TO_READY:
      break;
    case GST_STATE_READY_TO_PAUSED:
      theora_info_init (&dec->info);
      theora_comment_init (&dec->comment);
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      dec->need_keyframe = TRUE;
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      dec->initialized = FALSE;
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      dec->granulepos = -1;
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      break;
    case GST_STATE_PAUSED_TO_PLAYING:
      break;
    case GST_STATE_PLAYING_TO_PAUSED:
      break;
    case GST_STATE_PAUSED_TO_READY:
      theora_clear (&dec->state);
      theora_comment_clear (&dec->comment);
      theora_info_clear (&dec->info);
      dec->packetno = 0;
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      dec->granulepos = -1;
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      break;
    case GST_STATE_READY_TO_NULL:
      break;
    default:
      break;
  }

  return parent_class->change_state (element);
}
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static void
theora_dec_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstTheoraDec *dec = GST_THEORA_DEC (object);

  switch (prop_id) {
    case ARG_CROP:
      dec->crop = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
theora_dec_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstTheoraDec *dec = GST_THEORA_DEC (object);

  switch (prop_id) {
    case ARG_CROP:
      g_value_set_boolean (value, dec->crop);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}