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1 files changed, 1909 insertions, 0 deletions

diff --git a/ext/dv/gstdvdemux.c b/ext/dv/gstdvdemux.c
new file mode 100644
index 0000000..90a2651
--- /dev/null
+++ b/ext/dv/gstdvdemux.c
@@ -0,0 +1,1909 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *               <2005> Wim Taymans <wim@fluendo.com>
+ *
+ * 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 <math.h>
+
+#include <gst/audio/audio.h>
+#include "gstdvdemux.h"
+#include "gstsmptetimecode.h"
+
+/**
+ * SECTION:element-dvdemux
+ *
+ * dvdemux splits raw DV into its audio and video components. The audio will be
+ * decoded raw samples and the video will be encoded DV video.
+ *
+ * This element can operate in both push and pull mode depending on the
+ * capabilities of the upstream peer.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch filesrc location=test.dv ! dvdemux name=demux ! queue ! audioconvert ! alsasink demux. ! queue ! dvdec ! xvimagesink
+ * ]| This pipeline decodes and renders the raw DV stream to an audio and a videosink.
+ * </refsect2>
+ *
+ * Last reviewed on 2006-02-27 (0.10.3)
+ */
+
+/* DV output has two modes, normal and wide. The resolution is the same in both
+ * cases: 720 pixels wide by 576 pixels tall in PAL format, and 720x480 for
+ * NTSC.
+ *
+ * Each of the modes has its own pixel aspect ratio, which is fixed in practice
+ * by ITU-R BT.601 (also known as "CCIR-601" or "Rec.601"). Or so claims a
+ * reference that I culled from the reliable "internet",
+ * http://www.mir.com/DMG/aspect.html. Normal PAL is 59/54 and normal NTSC is
+ * 10/11. Because the pixel resolution is the same for both cases, we can get
+ * the pixel aspect ratio for wide recordings by multiplying by the ratio of
+ * display aspect ratios, 16/9 (for wide) divided by 4/3 (for normal):
+ *
+ * Wide NTSC: 10/11 * (16/9)/(4/3) = 40/33
+ * Wide PAL: 59/54 * (16/9)/(4/3) = 118/81
+ *
+ * However, the pixel resolution coming out of a DV source does not combine with
+ * the standard pixel aspect ratios to give a proper display aspect ratio. An
+ * image 480 pixels tall, with a 4:3 display aspect ratio, will be 768 pixels
+ * wide. But, if we take the normal PAL aspect ratio of 59/54, and multiply it
+ * with the width of the DV image (720 pixels), we get 786.666..., which is
+ * nonintegral and too wide. The camera is not outputting a 4:3 image.
+ * 
+ * If the video sink for this stream has fixed dimensions (such as for
+ * fullscreen playback, or for a java applet in a web page), you then have two
+ * choices. Either you show the whole image, but pad the image with black
+ * borders on the top and bottom (like watching a widescreen video on a 4:3
+ * device), or you crop the video to the proper ratio. Apparently the latter is
+ * the standard practice.
+ *
+ * For its part, GStreamer is concerned with accuracy and preservation of
+ * information. This element outputs the 720x576 or 720x480 video that it
+ * recieves, noting the proper aspect ratio. This should not be a problem for
+ * windowed applications, which can change size to fit the video. Applications
+ * with fixed size requirements should decide whether to crop or pad which
+ * an element such as videobox can do.
+ */
+
+#define NTSC_HEIGHT 480
+#define NTSC_BUFFER 120000
+#define NTSC_FRAMERATE_NUMERATOR 30000
+#define NTSC_FRAMERATE_DENOMINATOR 1001
+
+#define PAL_HEIGHT 576
+#define PAL_BUFFER 144000
+#define PAL_FRAMERATE_NUMERATOR 25
+#define PAL_FRAMERATE_DENOMINATOR 1
+
+#define PAL_NORMAL_PAR_X        59
+#define PAL_NORMAL_PAR_Y        54
+#define PAL_WIDE_PAR_X          118
+#define PAL_WIDE_PAR_Y          81
+
+#define NTSC_NORMAL_PAR_X       10
+#define NTSC_NORMAL_PAR_Y       11
+#define NTSC_WIDE_PAR_X         40
+#define NTSC_WIDE_PAR_Y         33
+
+GST_DEBUG_CATEGORY_STATIC (dvdemux_debug);
+#define GST_CAT_DEFAULT dvdemux_debug
+
+static GstStaticPadTemplate sink_temp = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) true")
+    );
+
+static GstStaticPadTemplate video_src_temp = GST_STATIC_PAD_TEMPLATE ("video",
+    GST_PAD_SRC,
+    GST_PAD_SOMETIMES,
+    GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) false")
+    );
+
+static GstStaticPadTemplate audio_src_temp = GST_STATIC_PAD_TEMPLATE ("audio",
+    GST_PAD_SRC,
+    GST_PAD_SOMETIMES,
+    GST_STATIC_CAPS ("audio/x-raw-int, "
+        "depth = (int) 16, "
+        "width = (int) 16, "
+        "signed = (boolean) TRUE, "
+        "channels = (int) {2, 4}, "
+        "endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
+        "rate = (int) { 32000, 44100, 48000 }")
+    );
+
+
+GST_BOILERPLATE (GstDVDemux, gst_dvdemux, GstElement, GST_TYPE_ELEMENT);
+
+static void gst_dvdemux_finalize (GObject * object);
+
+/* query functions */
+static const GstQueryType *gst_dvdemux_get_src_query_types (GstPad * pad);
+static gboolean gst_dvdemux_src_query (GstPad * pad, GstQuery * query);
+static const GstQueryType *gst_dvdemux_get_sink_query_types (GstPad * pad);
+static gboolean gst_dvdemux_sink_query (GstPad * pad, GstQuery * query);
+
+/* convert functions */
+static gboolean gst_dvdemux_sink_convert (GstDVDemux * demux,
+    GstFormat src_format, gint64 src_value, GstFormat * dest_format,
+    gint64 * dest_value);
+static gboolean gst_dvdemux_src_convert (GstDVDemux * demux, GstPad * pad,
+    GstFormat src_format, gint64 src_value, GstFormat * dest_format,
+    gint64 * dest_value);
+
+/* event functions */
+static gboolean gst_dvdemux_send_event (GstElement * element, GstEvent * event);
+static gboolean gst_dvdemux_handle_src_event (GstPad * pad, GstEvent * event);
+static gboolean gst_dvdemux_handle_sink_event (GstPad * pad, GstEvent * event);
+
+/* scheduling functions */
+static void gst_dvdemux_loop (GstPad * pad);
+static GstFlowReturn gst_dvdemux_flush (GstDVDemux * dvdemux);
+static GstFlowReturn gst_dvdemux_chain (GstPad * pad, GstBuffer * buffer);
+
+/* state change functions */
+static gboolean gst_dvdemux_sink_activate (GstPad * sinkpad);
+static gboolean gst_dvdemux_sink_activate_push (GstPad * sinkpad,
+    gboolean active);
+static gboolean gst_dvdemux_sink_activate_pull (GstPad * sinkpad,
+    gboolean active);
+static GstStateChangeReturn gst_dvdemux_change_state (GstElement * element,
+    GstStateChange transition);
+
+static void
+gst_dvdemux_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_temp));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&video_src_temp));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&audio_src_temp));
+
+  gst_element_class_set_details_simple (element_class,
+      "DV system stream demuxer", "Codec/Demuxer",
+      "Uses libdv to separate DV audio from DV video (libdv.sourceforge.net)",
+      "Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
+
+  GST_DEBUG_CATEGORY_INIT (dvdemux_debug, "dvdemux", 0, "DV demuxer element");
+}
+
+static void
+gst_dvdemux_class_init (GstDVDemuxClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  gobject_class->finalize = gst_dvdemux_finalize;
+
+  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dvdemux_change_state);
+  gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_dvdemux_send_event);
+}
+
+static void
+gst_dvdemux_init (GstDVDemux * dvdemux, GstDVDemuxClass * g_class)
+{
+  gint i;
+
+  dvdemux->sinkpad = gst_pad_new_from_static_template (&sink_temp, "sink");
+  /* we can operate in pull and push mode so we install
+   * a custom activate function */
+  gst_pad_set_activate_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate));
+  /* the function to activate in push mode */
+  gst_pad_set_activatepush_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate_push));
+  /* the function to activate in pull mode */
+  gst_pad_set_activatepull_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate_pull));
+  /* for push mode, this is the chain function */
+  gst_pad_set_chain_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_chain));
+  /* handling events (in push mode only) */
+  gst_pad_set_event_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_handle_sink_event));
+  /* query functions */
+  gst_pad_set_query_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_sink_query));
+  gst_pad_set_query_type_function (dvdemux->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_get_sink_query_types));
+
+  /* now add the pad */
+  gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->sinkpad);
+
+  dvdemux->adapter = gst_adapter_new ();
+
+  /* we need 4 temp buffers for audio decoding which are of a static
+   * size and which we can allocate here */
+  for (i = 0; i < 4; i++) {
+    dvdemux->audio_buffers[i] =
+        (gint16 *) g_malloc (DV_AUDIO_MAX_SAMPLES * sizeof (gint16));
+  }
+}
+
+static void
+gst_dvdemux_finalize (GObject * object)
+{
+  GstDVDemux *dvdemux;
+  gint i;
+
+  dvdemux = GST_DVDEMUX (object);
+
+  g_object_unref (dvdemux->adapter);
+
+  /* clean up temp audio buffers */
+  for (i = 0; i < 4; i++) {
+    g_free (dvdemux->audio_buffers[i]);
+  }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+/* reset to default values before starting streaming */
+static void
+gst_dvdemux_reset (GstDVDemux * dvdemux)
+{
+  dvdemux->frame_offset = 0;
+  dvdemux->audio_offset = 0;
+  dvdemux->video_offset = 0;
+  dvdemux->framecount = 0;
+  g_atomic_int_set (&dvdemux->found_header, 0);
+  dvdemux->frame_len = -1;
+  dvdemux->need_segment = FALSE;
+  dvdemux->new_media = FALSE;
+  dvdemux->framerate_numerator = 0;
+  dvdemux->framerate_denominator = 0;
+  dvdemux->height = 0;
+  dvdemux->frequency = 0;
+  dvdemux->channels = 0;
+  dvdemux->wide = FALSE;
+  gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES);
+  gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME);
+}
+
+static GstPad *
+gst_dvdemux_add_pad (GstDVDemux * dvdemux, GstStaticPadTemplate * template)
+{
+  gboolean no_more_pads;
+  GstPad *pad;
+
+  pad = gst_pad_new_from_static_template (template, template->name_template);
+
+  gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_dvdemux_src_query));
+
+  gst_pad_set_query_type_function (pad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_get_src_query_types));
+  gst_pad_set_event_function (pad,
+      GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event));
+  gst_pad_use_fixed_caps (pad);
+  gst_pad_set_active (pad, TRUE);
+  gst_element_add_pad (GST_ELEMENT (dvdemux), pad);
+
+  no_more_pads =
+      (dvdemux->videosrcpad != NULL && template == &audio_src_temp) ||
+      (dvdemux->audiosrcpad != NULL && template == &video_src_temp);
+
+  if (no_more_pads)
+    gst_element_no_more_pads (GST_ELEMENT (dvdemux));
+
+  gst_pad_push_event (pad, gst_event_new_new_segment (FALSE,
+          dvdemux->byte_segment.rate, GST_FORMAT_TIME,
+          dvdemux->time_segment.start, dvdemux->time_segment.stop,
+          dvdemux->time_segment.start));
+
+  if (no_more_pads) {
+    gst_element_found_tags (GST_ELEMENT (dvdemux),
+        gst_tag_list_new_full (GST_TAG_CONTAINER_FORMAT, "DV", NULL));
+  }
+
+  return pad;
+}
+
+static void
+gst_dvdemux_remove_pads (GstDVDemux * dvdemux)
+{
+  if (dvdemux->videosrcpad) {
+    gst_element_remove_pad (GST_ELEMENT (dvdemux), dvdemux->videosrcpad);
+    dvdemux->videosrcpad = NULL;
+  }
+  if (dvdemux->audiosrcpad) {
+    gst_element_remove_pad (GST_ELEMENT (dvdemux), dvdemux->audiosrcpad);
+    dvdemux->audiosrcpad = NULL;
+  }
+}
+
+static gboolean
+gst_dvdemux_src_convert (GstDVDemux * dvdemux, GstPad * pad,
+    GstFormat src_format, gint64 src_value, GstFormat * dest_format,
+    gint64 * dest_value)
+{
+  gboolean res = TRUE;
+
+  if (*dest_format == src_format || src_value == -1) {
+    *dest_value = src_value;
+    goto done;
+  }
+
+  if (dvdemux->frame_len <= 0)
+    goto error;
+
+  if (dvdemux->decoder == NULL)
+    goto error;
+
+  GST_INFO_OBJECT (pad,
+      "src_value:%" G_GINT64_FORMAT ", src_format:%d, dest_format:%d",
+      src_value, src_format, *dest_format);
+
+  switch (src_format) {
+    case GST_FORMAT_BYTES:
+      switch (*dest_format) {
+        case GST_FORMAT_DEFAULT:
+          if (pad == dvdemux->videosrcpad)
+            *dest_value = src_value / dvdemux->frame_len;
+          else if (pad == dvdemux->audiosrcpad)
+            *dest_value = src_value / (2 * dvdemux->channels);
+          break;
+        case GST_FORMAT_TIME:
+          *dest_format = GST_FORMAT_TIME;
+          if (pad == dvdemux->videosrcpad)
+            *dest_value = gst_util_uint64_scale (src_value,
+                GST_SECOND * dvdemux->framerate_denominator,
+                dvdemux->frame_len * dvdemux->framerate_numerator);
+          else if (pad == dvdemux->audiosrcpad)
+            *dest_value = gst_util_uint64_scale_int (src_value, GST_SECOND,
+                2 * dvdemux->frequency * dvdemux->channels);
+          break;
+        default:
+          res = FALSE;
+      }
+      break;
+    case GST_FORMAT_TIME:
+      switch (*dest_format) {
+        case GST_FORMAT_BYTES:
+          if (pad == dvdemux->videosrcpad)
+            *dest_value = gst_util_uint64_scale (src_value,
+                dvdemux->frame_len * dvdemux->framerate_numerator,
+                dvdemux->framerate_denominator * GST_SECOND);
+          else if (pad == dvdemux->audiosrcpad)
+            *dest_value = gst_util_uint64_scale_int (src_value,
+                2 * dvdemux->frequency * dvdemux->channels, GST_SECOND);
+          break;
+        case GST_FORMAT_DEFAULT:
+          if (pad == dvdemux->videosrcpad) {
+            if (src_value)
+              *dest_value = gst_util_uint64_scale (src_value,
+                  dvdemux->framerate_numerator,
+                  dvdemux->framerate_denominator * GST_SECOND);
+            else
+              *dest_value = 0;
+          } else if (pad == dvdemux->audiosrcpad) {
+            *dest_value = gst_util_uint64_scale (src_value,
+                dvdemux->frequency, GST_SECOND);
+          }
+          break;
+        default:
+          res = FALSE;
+      }
+      break;
+    case GST_FORMAT_DEFAULT:
+      switch (*dest_format) {
+        case GST_FORMAT_TIME:
+          if (pad == dvdemux->videosrcpad) {
+            *dest_value = gst_util_uint64_scale (src_value,
+                GST_SECOND * dvdemux->framerate_denominator,
+                dvdemux->framerate_numerator);
+          } else if (pad == dvdemux->audiosrcpad) {
+            if (src_value)
+              *dest_value = gst_util_uint64_scale (src_value,
+                  GST_SECOND, dvdemux->frequency);
+            else
+              *dest_value = 0;
+          }
+          break;
+        case GST_FORMAT_BYTES:
+          if (pad == dvdemux->videosrcpad) {
+            *dest_value = src_value * dvdemux->frame_len;
+          } else if (pad == dvdemux->audiosrcpad) {
+            *dest_value = src_value * 2 * dvdemux->channels;
+          }
+          break;
+        default:
+          res = FALSE;
+      }
+      break;
+    default:
+      res = FALSE;
+  }
+
+done:
+  GST_INFO_OBJECT (pad,
+      "Result : dest_format:%d, dest_value:%" G_GINT64_FORMAT ", res:%d",
+      *dest_format, *dest_value, res);
+  return res;
+
+  /* ERRORS */
+error:
+  {
+    GST_INFO ("source conversion failed");
+    return FALSE;
+  }
+}
+
+static gboolean
+gst_dvdemux_sink_convert (GstDVDemux * dvdemux, GstFormat src_format,
+    gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
+{
+  gboolean res = TRUE;
+
+  GST_DEBUG_OBJECT (dvdemux, "%d -> %d", src_format, *dest_format);
+  GST_INFO_OBJECT (dvdemux,
+      "src_value:%" G_GINT64_FORMAT ", src_format:%d, dest_format:%d",
+      src_value, src_format, *dest_format);
+
+  if (*dest_format == GST_FORMAT_DEFAULT)
+    *dest_format = GST_FORMAT_TIME;
+
+  if (*dest_format == src_format || src_value == -1) {
+    *dest_value = src_value;
+    goto done;
+  }
+
+  if (dvdemux->frame_len <= 0)
+    goto error;
+
+  switch (src_format) {
+    case GST_FORMAT_BYTES:
+      switch (*dest_format) {
+        case GST_FORMAT_TIME:
+        {
+          guint64 frame;
+
+          /* get frame number, rounds down so don't combine this
+           * line and the next line. */
+          frame = src_value / dvdemux->frame_len;
+
+          *dest_value = gst_util_uint64_scale (frame,
+              GST_SECOND * dvdemux->framerate_denominator,
+              dvdemux->framerate_numerator);
+          break;
+        }
+        default:
+          res = FALSE;
+      }
+      break;
+    case GST_FORMAT_TIME:
+      switch (*dest_format) {
+        case GST_FORMAT_BYTES:
+        {
+          guint64 frame;
+
+          /* calculate the frame */
+          frame =
+              gst_util_uint64_scale (src_value, dvdemux->framerate_numerator,
+              dvdemux->framerate_denominator * GST_SECOND);
+
+          /* calculate the offset from the rounded frame */
+          *dest_value = frame * dvdemux->frame_len;
+          break;
+        }
+        default:
+          res = FALSE;
+      }
+      break;
+    default:
+      res = FALSE;
+  }
+  GST_INFO_OBJECT (dvdemux,
+      "Result : dest_format:%d, dest_value:%" G_GINT64_FORMAT ", res:%d",
+      *dest_format, *dest_value, res);
+
+done:
+  return res;
+
+error:
+  {
+    GST_INFO_OBJECT (dvdemux, "sink conversion failed");
+    return FALSE;
+  }
+}
+
+static const GstQueryType *
+gst_dvdemux_get_src_query_types (GstPad * pad)
+{
+  static const GstQueryType src_query_types[] = {
+    GST_QUERY_POSITION,
+    GST_QUERY_DURATION,
+    GST_QUERY_CONVERT,
+    0
+  };
+
+  return src_query_types;
+}
+
+static gboolean
+gst_dvdemux_src_query (GstPad * pad, GstQuery * query)
+{
+  gboolean res = TRUE;
+  GstDVDemux *dvdemux;
+
+  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
+
+  switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_POSITION:
+    {
+      GstFormat format;
+      gint64 cur;
+
+      /* get target format */
+      gst_query_parse_position (query, &format, NULL);
+
+      /* bring the position to the requested format. */
+      if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
+                  GST_FORMAT_TIME, dvdemux->time_segment.last_stop,
+                  &format, &cur)))
+        goto error;
+      gst_query_set_position (query, format, cur);
+      break;
+    }
+    case GST_QUERY_DURATION:
+    {
+      GstFormat format;
+      GstFormat format2;
+      gint64 end;
+      GstPad *peer;
+
+      /* get target format */
+      gst_query_parse_duration (query, &format, NULL);
+
+      /* change query to bytes to perform on peer */
+      gst_query_set_duration (query, GST_FORMAT_BYTES, -1);
+
+      if ((peer = gst_pad_get_peer (dvdemux->sinkpad))) {
+        /* ask peer for total length */
+        if (!(res = gst_pad_query (peer, query))) {
+          gst_object_unref (peer);
+          goto error;
+        }
+
+        /* get peer total length */
+        gst_query_parse_duration (query, NULL, &end);
+
+        gst_object_unref (peer);
+
+        /* convert end to requested format */
+        if (end != -1) {
+          format2 = format;
+          if (!(res = gst_dvdemux_sink_convert (dvdemux,
+                      GST_FORMAT_BYTES, end, &format2, &end))) {
+            goto error;
+          }
+        }
+      } else {
+        end = -1;
+      }
+      gst_query_set_duration (query, format, end);
+      break;
+    }
+    case GST_QUERY_CONVERT:
+    {
+      GstFormat src_fmt, dest_fmt;
+      gint64 src_val, dest_val;
+
+      gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
+      if (!(res =
+              gst_dvdemux_src_convert (dvdemux, pad, src_fmt, src_val,
+                  &dest_fmt, &dest_val)))
+        goto error;
+      gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
+      break;
+    }
+    default:
+      res = gst_pad_query_default (pad, query);
+      break;
+  }
+  gst_object_unref (dvdemux);
+
+  return res;
+
+  /* ERRORS */
+error:
+  {
+    gst_object_unref (dvdemux);
+    GST_DEBUG ("error source query");
+    return FALSE;
+  }
+}
+
+static const GstQueryType *
+gst_dvdemux_get_sink_query_types (GstPad * pad)
+{
+  static const GstQueryType sink_query_types[] = {
+    GST_QUERY_CONVERT,
+    0
+  };
+
+  return sink_query_types;
+}
+
+static gboolean
+gst_dvdemux_sink_query (GstPad * pad, GstQuery * query)
+{
+  gboolean res = TRUE;
+  GstDVDemux *dvdemux;
+
+  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
+
+  switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_CONVERT:
+    {
+      GstFormat src_fmt, dest_fmt;
+      gint64 src_val, dest_val;
+
+      gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
+      if (!(res =
+              gst_dvdemux_sink_convert (dvdemux, src_fmt, src_val, &dest_fmt,
+                  &dest_val)))
+        goto error;
+      gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
+      break;
+    }
+    default:
+      res = gst_pad_query_default (pad, query);
+      break;
+  }
+  gst_object_unref (dvdemux);
+
+  return res;
+
+  /* ERRORS */
+error:
+  {
+    gst_object_unref (dvdemux);
+    GST_DEBUG ("error handling sink query");
+    return FALSE;
+  }
+}
+
+/* takes ownership of the event */
+static gboolean
+gst_dvdemux_push_event (GstDVDemux * dvdemux, GstEvent * event)
+{
+  gboolean res = FALSE;
+
+  if (dvdemux->videosrcpad) {
+    gst_event_ref (event);
+    res |= gst_pad_push_event (dvdemux->videosrcpad, event);
+  }
+
+  if (dvdemux->audiosrcpad)
+    res |= gst_pad_push_event (dvdemux->audiosrcpad, event);
+  else
+    gst_event_unref (event);
+
+  return res;
+}
+
+static gboolean
+gst_dvdemux_handle_sink_event (GstPad * pad, GstEvent * event)
+{
+  GstDVDemux *dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
+  gboolean res = TRUE;
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_FLUSH_START:
+      /* we are not blocking on anything exect the push() calls
+       * to the peer which will be unblocked by forwarding the
+       * event.*/
+      res = gst_dvdemux_push_event (dvdemux, event);
+      break;
+    case GST_EVENT_FLUSH_STOP:
+      gst_adapter_clear (dvdemux->adapter);
+      GST_DEBUG ("cleared adapter");
+      gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES);
+      gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME);
+      res = gst_dvdemux_push_event (dvdemux, event);
+      break;
+    case GST_EVENT_NEWSEGMENT:
+    {
+      gboolean update;
+      gdouble rate;
+      GstFormat format;
+      gint64 start, stop, time;
+
+      /* parse byte start and stop positions */
+      gst_event_parse_new_segment (event, &update, &rate, &format,
+          &start, &stop, &time);
+
+      switch (format) {
+        case GST_FORMAT_BYTES:
+          gst_segment_set_newsegment (&dvdemux->byte_segment, update,
+              rate, format, start, stop, time);
+
+          /* the update can always be sent */
+          if (update) {
+            GstEvent *update;
+
+            update = gst_event_new_new_segment (TRUE,
+                dvdemux->time_segment.rate, dvdemux->time_segment.format,
+                dvdemux->time_segment.start, dvdemux->time_segment.last_stop,
+                dvdemux->time_segment.time);
+
+            gst_dvdemux_push_event (dvdemux, update);
+          } else {
+            /* and queue a SEGMENT before sending the next set of buffers, we
+             * cannot convert to time yet as we might not know the size of the
+             * frames, etc.. */
+            dvdemux->need_segment = TRUE;
+          }
+          gst_event_unref (event);
+          break;
+        case GST_FORMAT_TIME:
+          gst_segment_set_newsegment (&dvdemux->time_segment, update,
+              rate, format, start, stop, time);
+
+          /* and we can just forward this time event */
+          res = gst_dvdemux_push_event (dvdemux, event);
+          break;
+        default:
+          gst_event_unref (event);
+          /* cannot accept this format */
+          res = FALSE;
+          break;
+      }
+      break;
+    }
+    case GST_EVENT_EOS:
+      /* flush any pending data, should be nothing left. */
+      gst_dvdemux_flush (dvdemux);
+      /* forward event */
+      res = gst_dvdemux_push_event (dvdemux, event);
+      /* and clear the adapter */
+      gst_adapter_clear (dvdemux->adapter);
+      break;
+    default:
+      res = gst_dvdemux_push_event (dvdemux, event);
+      break;
+  }
+
+  gst_object_unref (dvdemux);
+
+  return res;
+}
+
+/* convert a pair of values on the given srcpad */
+static gboolean
+gst_dvdemux_convert_src_pair (GstDVDemux * dvdemux, GstPad * pad,
+    GstFormat src_format, gint64 src_start, gint64 src_stop,
+    GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
+{
+  gboolean res;
+
+  GST_INFO ("starting conversion of start");
+  /* bring the format to time on srcpad. */
+  if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
+              src_format, src_start, &dst_format, dst_start))) {
+    goto done;
+  }
+  GST_INFO ("Finished conversion of start: %" G_GINT64_FORMAT, *dst_start);
+
+  GST_INFO ("starting conversion of stop");
+  /* bring the format to time on srcpad. */
+  if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
+              src_format, src_stop, &dst_format, dst_stop))) {
+    /* could not convert seek format to time offset */
+    goto done;
+  }
+  GST_INFO ("Finished conversion of stop: %" G_GINT64_FORMAT, *dst_stop);
+done:
+  return res;
+}
+
+/* convert a pair of values on the sinkpad */
+static gboolean
+gst_dvdemux_convert_sink_pair (GstDVDemux * dvdemux,
+    GstFormat src_format, gint64 src_start, gint64 src_stop,
+    GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
+{
+  gboolean res;
+
+  GST_INFO ("starting conversion of start");
+  /* bring the format to time on srcpad. */
+  if (!(res = gst_dvdemux_sink_convert (dvdemux,
+              src_format, src_start, &dst_format, dst_start))) {
+    goto done;
+  }
+  GST_INFO ("Finished conversion of start: %" G_GINT64_FORMAT, *dst_start);
+
+  GST_INFO ("starting conversion of stop");
+  /* bring the format to time on srcpad. */
+  if (!(res = gst_dvdemux_sink_convert (dvdemux,
+              src_format, src_stop, &dst_format, dst_stop))) {
+    /* could not convert seek format to time offset */
+    goto done;
+  }
+  GST_INFO ("Finished conversion of stop: %" G_GINT64_FORMAT, *dst_stop);
+done:
+  return res;
+}
+
+/* convert a pair of values on the srcpad to a pair of
+ * values on the sinkpad 
+ */
+static gboolean
+gst_dvdemux_convert_src_to_sink (GstDVDemux * dvdemux, GstPad * pad,
+    GstFormat src_format, gint64 src_start, gint64 src_stop,
+    GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
+{
+  GstFormat conv;
+  gboolean res;
+
+  conv = GST_FORMAT_TIME;
+  /* convert to TIME intermediate format */
+  if (!(res = gst_dvdemux_convert_src_pair (dvdemux, pad,
+              src_format, src_start, src_stop, conv, dst_start, dst_stop))) {
+    /* could not convert format to time offset */
+    goto done;
+  }
+  /* convert to dst format on sinkpad */
+  if (!(res = gst_dvdemux_convert_sink_pair (dvdemux,
+              conv, *dst_start, *dst_stop, dst_format, dst_start, dst_stop))) {
+    /* could not convert format to time offset */
+    goto done;
+  }
+done:
+  return res;
+}
+
+#if 0
+static gboolean
+gst_dvdemux_convert_segment (GstDVDemux * dvdemux, GstSegment * src,
+    GstSegment * dest)
+{
+  dest->rate = src->rate;
+  dest->abs_rate = src->abs_rate;
+  dest->flags = src->flags;
+
+  return TRUE;
+}
+#endif
+
+/* handle seek in push base mode.
+ *
+ * Convert the time seek to a bytes seek and send it
+ * upstream
+ * Does not take ownership of the event.
+ */
+static gboolean
+gst_dvdemux_handle_push_seek (GstDVDemux * dvdemux, GstPad * pad,
+    GstEvent * event)
+{
+  gboolean res = FALSE;
+  gdouble rate;
+  GstSeekFlags flags;
+  GstFormat format;
+  GstSeekType cur_type, stop_type;
+  gint64 cur, stop;
+  gint64 start_position, end_position;
+  GstEvent *newevent;
+
+  gst_event_parse_seek (event, &rate, &format, &flags,
+      &cur_type, &cur, &stop_type, &stop);
+
+  /* First try if upstream can handle time based seeks */
+  if (format == GST_FORMAT_TIME)
+    res = gst_pad_push_event (dvdemux->sinkpad, gst_event_ref (event));
+
+  if (!res) {
+    /* we convert the start/stop on the srcpad to the byte format
+     * on the sinkpad and forward the event */
+    res = gst_dvdemux_convert_src_to_sink (dvdemux, pad,
+        format, cur, stop, GST_FORMAT_BYTES, &start_position, &end_position);
+    if (!res)
+      goto done;
+
+    /* now this is the updated seek event on bytes */
+    newevent = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
+        cur_type, start_position, stop_type, end_position);
+
+    res = gst_pad_push_event (dvdemux->sinkpad, newevent);
+  }
+done:
+  return res;
+}
+
+/* position ourselves to the configured segment, used in pull mode.
+ * The input segment is in TIME format. We convert the time values
+ * to bytes values into our byte_segment which we use to pull data from
+ * the sinkpad peer.
+ */
+static gboolean
+gst_dvdemux_do_seek (GstDVDemux * demux, GstSegment * segment)
+{
+  gboolean res;
+  GstFormat format;
+
+  /* position to value configured is last_stop, this will round down
+   * to the byte position where the frame containing the given 
+   * timestamp can be found. */
+  format = GST_FORMAT_BYTES;
+  res = gst_dvdemux_sink_convert (demux,
+      segment->format, segment->last_stop,
+      &format, &demux->byte_segment.last_stop);
+  if (!res)
+    goto done;
+
+  /* update byte segment start */
+  gst_dvdemux_sink_convert (demux,
+      segment->format, segment->start, &format, &demux->byte_segment.start);
+
+  /* update byte segment stop */
+  gst_dvdemux_sink_convert (demux,
+      segment->format, segment->stop, &format, &demux->byte_segment.stop);
+
+  /* update byte segment time */
+  gst_dvdemux_sink_convert (demux,
+      segment->format, segment->time, &format, &demux->byte_segment.time);
+
+  /* calculate current frame number */
+  format = GST_FORMAT_DEFAULT;
+  gst_dvdemux_src_convert (demux, demux->videosrcpad,
+      segment->format, segment->start, &format, &demux->video_offset);
+
+  /* calculate current audio number */
+  format = GST_FORMAT_DEFAULT;
+  gst_dvdemux_src_convert (demux, demux->audiosrcpad,
+      segment->format, segment->start, &format, &demux->audio_offset);
+
+  /* every DV frame corresponts with one video frame */
+  demux->frame_offset = demux->video_offset;
+
+done:
+  return res;
+}
+
+/* handle seek in pull base mode.
+ *
+ * Does not take ownership of the event.
+ */
+static gboolean
+gst_dvdemux_handle_pull_seek (GstDVDemux * demux, GstPad * pad,
+    GstEvent * event)
+{
+  gboolean res;
+  gdouble rate;
+  GstFormat format;
+  GstSeekFlags flags;
+  GstSeekType cur_type, stop_type;
+  gint64 cur, stop;
+  gboolean flush;
+  gboolean update;
+  GstSegment seeksegment;
+
+  GST_DEBUG_OBJECT (demux, "doing seek");
+
+  /* first bring the event format to TIME, our native format
+   * to perform the seek on */
+  if (event) {
+    GstFormat conv;
+
+    gst_event_parse_seek (event, &rate, &format, &flags,
+        &cur_type, &cur, &stop_type, &stop);
+
+    /* can't seek backwards yet */
+    if (rate <= 0.0)
+      goto wrong_rate;
+
+    /* convert input format to TIME */
+    conv = GST_FORMAT_TIME;
+    if (!(gst_dvdemux_convert_src_pair (demux, pad,
+                format, cur, stop, conv, &cur, &stop)))
+      goto no_format;
+
+    format = GST_FORMAT_TIME;
+  } else {
+    flags = 0;
+  }
+
+  flush = flags & GST_SEEK_FLAG_FLUSH;
+
+  /* send flush start */
+  if (flush)
+    gst_dvdemux_push_event (demux, gst_event_new_flush_start ());
+  else
+    gst_pad_pause_task (demux->sinkpad);
+
+  /* grab streaming lock, this should eventually be possible, either
+   * because the task is paused or our streaming thread stopped
+   * because our peer is flushing. */
+  GST_PAD_STREAM_LOCK (demux->sinkpad);
+
+  /* make copy into temp structure, we can only update the main one
+   * when the subclass actually could to the seek. */
+  memcpy (&seeksegment, &demux->time_segment, sizeof (GstSegment));
+
+  /* now configure the seek segment */
+  if (event) {
+    gst_segment_set_seek (&seeksegment, rate, format, flags,
+        cur_type, cur, stop_type, stop, &update);
+  }
+
+  GST_DEBUG_OBJECT (demux, "segment configured from %" G_GINT64_FORMAT
+      " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
+      seeksegment.start, seeksegment.stop, seeksegment.last_stop);
+
+  /* do the seek, segment.last_stop contains new position. */
+  res = gst_dvdemux_do_seek (demux, &seeksegment);
+
+  /* and prepare to continue streaming */
+  if (flush) {
+    /* send flush stop, peer will accept data and events again. We
+     * are not yet providing data as we still have the STREAM_LOCK. */
+    gst_dvdemux_push_event (demux, gst_event_new_flush_stop ());
+  } else if (res && demux->running) {
+    /* we are running the current segment and doing a non-flushing seek,
+     * close the segment first based on the last_stop. */
+    GST_DEBUG_OBJECT (demux, "closing running segment %" G_GINT64_FORMAT
+        " to %" G_GINT64_FORMAT, demux->time_segment.start,
+        demux->time_segment.last_stop);
+
+    gst_dvdemux_push_event (demux,
+        gst_event_new_new_segment (TRUE,
+            demux->time_segment.rate, demux->time_segment.format,
+            demux->time_segment.start, demux->time_segment.last_stop,
+            demux->time_segment.time));
+  }
+
+  /* if successfull seek, we update our real segment and push
+   * out the new segment. */
+  if (res) {
+    memcpy (&demux->time_segment, &seeksegment, sizeof (GstSegment));
+
+    if (demux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) {
+      gst_element_post_message (GST_ELEMENT_CAST (demux),
+          gst_message_new_segment_start (GST_OBJECT_CAST (demux),
+              demux->time_segment.format, demux->time_segment.last_stop));
+    }
+    if ((stop = demux->time_segment.stop) == -1)
+      stop = demux->time_segment.duration;
+
+    GST_INFO_OBJECT (demux,
+        "Saving newsegment event to be sent in streaming thread");
+
+    if (demux->pending_segment)
+      gst_event_unref (demux->pending_segment);
+
+    demux->pending_segment = gst_event_new_new_segment (FALSE,
+        demux->time_segment.rate, demux->time_segment.format,
+        demux->time_segment.last_stop, stop, demux->time_segment.time);
+
+    demux->need_segment = FALSE;
+  }
+
+  demux->running = TRUE;
+  /* and restart the task in case it got paused explicitely or by
+   * the FLUSH_START event we pushed out. */
+  gst_pad_start_task (demux->sinkpad, (GstTaskFunction) gst_dvdemux_loop,
+      demux->sinkpad);
+
+  /* and release the lock again so we can continue streaming */
+  GST_PAD_STREAM_UNLOCK (demux->sinkpad);
+
+  return TRUE;
+
+  /* ERRORS */
+wrong_rate:
+  {
+    GST_DEBUG_OBJECT (demux, "negative playback rate %lf not supported.", rate);
+    return FALSE;
+  }
+no_format:
+  {
+    GST_DEBUG_OBJECT (demux, "cannot convert to TIME format, seek aborted.");
+    return FALSE;
+  }
+}
+
+static gboolean
+gst_dvdemux_send_event (GstElement * element, GstEvent * event)
+{
+  GstDVDemux *dvdemux = GST_DVDEMUX (element);
+  gboolean res = FALSE;
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_SEEK:
+    {
+      /* checking header and configuring the seek must be atomic */
+      GST_OBJECT_LOCK (dvdemux);
+      if (g_atomic_int_get (&dvdemux->found_header) == 0) {
+        GstEvent **event_p;
+
+        event_p = &dvdemux->seek_event;
+
+        /* We don't have pads yet. Keep the event. */
+        GST_INFO_OBJECT (dvdemux, "Keeping the seek event for later");
+
+        gst_event_replace (event_p, event);
+        GST_OBJECT_UNLOCK (dvdemux);
+
+        res = TRUE;
+      } else {
+        GST_OBJECT_UNLOCK (dvdemux);
+
+        if (dvdemux->seek_handler) {
+          res = dvdemux->seek_handler (dvdemux, dvdemux->videosrcpad, event);
+          gst_event_unref (event);
+        }
+      }
+      break;
+    }
+    default:
+      res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
+      break;
+  }
+
+  return res;
+}
+
+/* handle an event on the source pad, it's most likely a seek */
+static gboolean
+gst_dvdemux_handle_src_event (GstPad * pad, GstEvent * event)
+{
+  gboolean res = TRUE;
+  GstDVDemux *dvdemux;
+
+  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_SEEK:
+      /* seek handler is installed based on scheduling mode */
+      if (dvdemux->seek_handler)
+        res = dvdemux->seek_handler (dvdemux, pad, event);
+      else
+        res = FALSE;
+      break;
+    case GST_EVENT_QOS:
+      /* we can't really (yet) do QoS */
+      res = FALSE;
+      break;
+    case GST_EVENT_NAVIGATION:
+      /* no navigation either... */
+      res = FALSE;
+      break;
+    default:
+      res = gst_pad_push_event (dvdemux->sinkpad, event);
+      event = NULL;
+      break;
+  }
+  if (event)
+    gst_event_unref (event);
+
+  gst_object_unref (dvdemux);
+
+  return res;
+}
+
+/* does not take ownership of buffer */
+static GstFlowReturn
+gst_dvdemux_demux_audio (GstDVDemux * dvdemux, GstBuffer * buffer,
+    guint64 duration)
+{
+  gint num_samples;
+  GstFlowReturn ret;
+  const guint8 *data;
+
+  data = GST_BUFFER_DATA (buffer);
+
+  dv_decode_full_audio (dvdemux->decoder, data, dvdemux->audio_buffers);
+
+  if (G_LIKELY ((num_samples = dv_get_num_samples (dvdemux->decoder)) > 0)) {
+    gint16 *a_ptr;
+    gint i, j;
+    GstBuffer *outbuf;
+    gint frequency, channels;
+
+    if (G_UNLIKELY (dvdemux->audiosrcpad == NULL))
+      dvdemux->audiosrcpad = gst_dvdemux_add_pad (dvdemux, &audio_src_temp);
+
+    /* get initial format or check if format changed */
+    frequency = dv_get_frequency (dvdemux->decoder);
+    channels = dv_get_num_channels (dvdemux->decoder);
+
+    if (G_UNLIKELY ((frequency != dvdemux->frequency)
+            || (channels != dvdemux->channels))) {
+      GstCaps *caps;
+
+      dvdemux->frequency = frequency;
+      dvdemux->channels = channels;
+
+      /* and set new caps */
+      caps = gst_caps_new_simple ("audio/x-raw-int",
+          "rate", G_TYPE_INT, frequency,
+          "depth", G_TYPE_INT, 16,
+          "width", G_TYPE_INT, 16,
+          "signed", G_TYPE_BOOLEAN, TRUE,
+          "channels", G_TYPE_INT, channels,
+          "endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
+      gst_pad_set_caps (dvdemux->audiosrcpad, caps);
+      gst_caps_unref (caps);
+    }
+
+    outbuf = gst_buffer_new_and_alloc (num_samples *
+        sizeof (gint16) * dvdemux->channels);
+
+    a_ptr = (gint16 *) GST_BUFFER_DATA (outbuf);
+
+    for (i = 0; i < num_samples; i++) {
+      for (j = 0; j < dvdemux->channels; j++) {
+        *(a_ptr++) = dvdemux->audio_buffers[j][i];
+      }
+    }
+
+    GST_DEBUG ("pushing audio %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (dvdemux->time_segment.last_stop));
+
+    GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.last_stop;
+    GST_BUFFER_DURATION (outbuf) = duration;
+    GST_BUFFER_OFFSET (outbuf) = dvdemux->audio_offset;
+    dvdemux->audio_offset += num_samples;
+    GST_BUFFER_OFFSET_END (outbuf) = dvdemux->audio_offset;
+
+    if (dvdemux->new_media)
+      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
+    gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dvdemux->audiosrcpad));
+
+    ret = gst_pad_push (dvdemux->audiosrcpad, outbuf);
+  } else {
+    /* no samples */
+    ret = GST_FLOW_OK;
+  }
+
+  return ret;
+}
+
+/* takes ownership of buffer */
+static GstFlowReturn
+gst_dvdemux_demux_video (GstDVDemux * dvdemux, GstBuffer * buffer,
+    guint64 duration)
+{
+  GstBuffer *outbuf;
+  gint height;
+  gboolean wide;
+  GstFlowReturn ret = GST_FLOW_OK;
+
+  if (G_UNLIKELY (dvdemux->videosrcpad == NULL))
+    dvdemux->videosrcpad = gst_dvdemux_add_pad (dvdemux, &video_src_temp);
+
+  /* get params */
+  /* framerate is already up-to-date */
+  height = dvdemux->decoder->height;
+  wide = dv_format_wide (dvdemux->decoder);
+
+  /* see if anything changed */
+  if (G_UNLIKELY ((dvdemux->height != height) || dvdemux->wide != wide)) {
+    GstCaps *caps;
+    gint par_x, par_y;
+
+    dvdemux->height = height;
+    dvdemux->wide = wide;
+
+    if (dvdemux->decoder->system == e_dv_system_625_50) {
+      if (wide) {
+        par_x = PAL_WIDE_PAR_X;
+        par_y = PAL_WIDE_PAR_Y;
+      } else {
+        par_x = PAL_NORMAL_PAR_X;
+        par_y = PAL_NORMAL_PAR_Y;
+      }
+    } else {
+      if (wide) {
+        par_x = NTSC_WIDE_PAR_X;
+        par_y = NTSC_WIDE_PAR_Y;
+      } else {
+        par_x = NTSC_NORMAL_PAR_X;
+        par_y = NTSC_NORMAL_PAR_Y;
+      }
+    }
+
+    caps = gst_caps_new_simple ("video/x-dv",
+        "systemstream", G_TYPE_BOOLEAN, FALSE,
+        "width", G_TYPE_INT, 720,
+        "height", G_TYPE_INT, height,
+        "framerate", GST_TYPE_FRACTION, dvdemux->framerate_numerator,
+        dvdemux->framerate_denominator,
+        "pixel-aspect-ratio", GST_TYPE_FRACTION, par_x, par_y, NULL);
+    gst_pad_set_caps (dvdemux->videosrcpad, caps);
+    gst_caps_unref (caps);
+  }
+
+  /* takes ownership of buffer here, we just need to modify
+   * the metadata. */
+  outbuf = gst_buffer_make_metadata_writable (buffer);
+
+  GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.last_stop;
+  GST_BUFFER_OFFSET (outbuf) = dvdemux->video_offset;
+  GST_BUFFER_OFFSET_END (outbuf) = dvdemux->video_offset + 1;
+  GST_BUFFER_DURATION (outbuf) = duration;
+
+  if (dvdemux->new_media)
+    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
+  gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dvdemux->videosrcpad));
+
+  GST_DEBUG ("pushing video %" GST_TIME_FORMAT,
+      GST_TIME_ARGS (dvdemux->time_segment.last_stop));
+
+  ret = gst_pad_push (dvdemux->videosrcpad, outbuf);
+
+  dvdemux->video_offset++;
+
+  return ret;
+}
+
+static int
+get_ssyb_offset (int dif, int ssyb)
+{
+  int offset;
+
+  offset = dif * 12000;         /* to dif */
+  offset += 80 * (1 + (ssyb / 6));      /* to subcode pack */
+  offset += 3;                  /* past header */
+  offset += 8 * (ssyb % 6);     /* to ssyb */
+
+  return offset;
+}
+
+static gboolean
+gst_dvdemux_get_timecode (GstDVDemux * dvdemux, GstBuffer * buffer,
+    GstSMPTETimeCode * timecode)
+{
+  guint8 *data = GST_BUFFER_DATA (buffer);
+  int offset;
+  int dif;
+  int n_difs = dvdemux->decoder->num_dif_seqs;
+
+  for (dif = 0; dif < n_difs; dif++) {
+    offset = get_ssyb_offset (dif, 3);
+    if (data[offset + 3] == 0x13) {
+      timecode->frames = ((data[offset + 4] >> 4) & 0x3) * 10 +
+          (data[offset + 4] & 0xf);
+      timecode->seconds = ((data[offset + 5] >> 4) & 0x3) * 10 +
+          (data[offset + 5] & 0xf);
+      timecode->minutes = ((data[offset + 6] >> 4) & 0x3) * 10 +
+          (data[offset + 6] & 0xf);
+      timecode->hours = ((data[offset + 7] >> 4) & 0x3) * 10 +
+          (data[offset + 7] & 0xf);
+      GST_DEBUG ("got timecode %" GST_SMPTE_TIME_CODE_FORMAT,
+          GST_SMPTE_TIME_CODE_ARGS (timecode));
+      return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
+static gboolean
+gst_dvdemux_is_new_media (GstDVDemux * dvdemux, GstBuffer * buffer)
+{
+  guint8 *data = GST_BUFFER_DATA (buffer);
+  int aaux_offset;
+  int dif;
+  int n_difs;
+
+  n_difs = dvdemux->decoder->num_dif_seqs;
+
+  for (dif = 0; dif < n_difs; dif++) {
+    if (dif & 1) {
+      aaux_offset = (dif * 12000) + (6 + 16 * 1) * 80 + 3;
+    } else {
+      aaux_offset = (dif * 12000) + (6 + 16 * 4) * 80 + 3;
+    }
+    if (data[aaux_offset + 0] == 0x51) {
+      if ((data[aaux_offset + 2] & 0x80) == 0)
+        return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
+/* takes ownership of buffer */
+static GstFlowReturn
+gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
+{
+  GstClockTime next_ts;
+  GstFlowReturn aret, vret, ret;
+  guint8 *data;
+  guint64 duration;
+  GstSMPTETimeCode timecode;
+  int frame_number;
+
+  if (G_UNLIKELY (dvdemux->need_segment)) {
+    GstEvent *event;
+    GstFormat format;
+
+    /* convert to time and store as start/end_timestamp */
+    format = GST_FORMAT_TIME;
+    if (!(gst_dvdemux_convert_sink_pair (dvdemux,
+                GST_FORMAT_BYTES, dvdemux->byte_segment.start,
+                dvdemux->byte_segment.stop, format,
+                &dvdemux->time_segment.start, &dvdemux->time_segment.stop)))
+      goto segment_error;
+
+    dvdemux->time_segment.rate = dvdemux->byte_segment.rate;
+    dvdemux->time_segment.abs_rate = dvdemux->byte_segment.abs_rate;
+    dvdemux->time_segment.last_stop = dvdemux->time_segment.start;
+
+    /* calculate current frame number */
+    format = GST_FORMAT_DEFAULT;
+    if (!(gst_dvdemux_src_convert (dvdemux, dvdemux->videosrcpad,
+                GST_FORMAT_TIME, dvdemux->time_segment.start,
+                &format, &dvdemux->frame_offset)))
+      goto segment_error;
+
+    GST_DEBUG_OBJECT (dvdemux, "sending segment start: %" GST_TIME_FORMAT
+        ", stop: %" GST_TIME_FORMAT ", time: %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (dvdemux->time_segment.start),
+        GST_TIME_ARGS (dvdemux->time_segment.stop),
+        GST_TIME_ARGS (dvdemux->time_segment.start));
+
+    event = gst_event_new_new_segment (FALSE, dvdemux->byte_segment.rate,
+        GST_FORMAT_TIME, dvdemux->time_segment.start,
+        dvdemux->time_segment.stop, dvdemux->time_segment.start);
+    gst_dvdemux_push_event (dvdemux, event);
+
+    dvdemux->need_segment = FALSE;
+  }
+
+  gst_dvdemux_get_timecode (dvdemux, buffer, &timecode);
+  gst_smpte_time_code_get_frame_number (
+      (dvdemux->decoder->system == e_dv_system_625_50) ?
+      GST_SMPTE_TIME_CODE_SYSTEM_25 : GST_SMPTE_TIME_CODE_SYSTEM_30,
+      &frame_number, &timecode);
+
+  next_ts = gst_util_uint64_scale_int (
+      (dvdemux->frame_offset + 1) * GST_SECOND,
+      dvdemux->framerate_denominator, dvdemux->framerate_numerator);
+  duration = next_ts - dvdemux->time_segment.last_stop;
+
+  data = GST_BUFFER_DATA (buffer);
+
+  dv_parse_packs (dvdemux->decoder, data);
+  dvdemux->new_media = FALSE;
+  if (gst_dvdemux_is_new_media (dvdemux, buffer) &&
+      dvdemux->frames_since_new_media > 2) {
+    dvdemux->new_media = TRUE;
+    dvdemux->frames_since_new_media = 0;
+  }
+  dvdemux->frames_since_new_media++;
+
+  /* does not take ownership of buffer */
+  aret = ret = gst_dvdemux_demux_audio (dvdemux, buffer, duration);
+  if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)) {
+    gst_buffer_unref (buffer);
+    goto done;
+  }
+
+  /* takes ownership of buffer */
+  vret = ret = gst_dvdemux_demux_video (dvdemux, buffer, duration);
+  if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED))
+    goto done;
+
+  /* if both are not linked, we stop */
+  if (G_UNLIKELY (aret == GST_FLOW_NOT_LINKED && vret == GST_FLOW_NOT_LINKED)) {
+    ret = GST_FLOW_NOT_LINKED;
+    goto done;
+  }
+
+  gst_segment_set_last_stop (&dvdemux->time_segment, GST_FORMAT_TIME, next_ts);
+  dvdemux->frame_offset++;
+
+  /* check for the end of the segment */
+  if (dvdemux->time_segment.stop != -1 && next_ts > dvdemux->time_segment.stop)
+    ret = GST_FLOW_UNEXPECTED;
+  else
+    ret = GST_FLOW_OK;
+
+done:
+  return ret;
+
+  /* ERRORS */
+segment_error:
+  {
+    GST_DEBUG ("error generating new_segment event");
+    gst_buffer_unref (buffer);
+    return GST_FLOW_ERROR;
+  }
+}
+
+/* flush any remaining data in the adapter, used in chain based scheduling mode */
+static GstFlowReturn
+gst_dvdemux_flush (GstDVDemux * dvdemux)
+{
+  GstFlowReturn ret = GST_FLOW_OK;
+
+  while (gst_adapter_available (dvdemux->adapter) >= dvdemux->frame_len) {
+    const guint8 *data;
+    gint length;
+
+    /* get the accumulated bytes */
+    data = gst_adapter_peek (dvdemux->adapter, dvdemux->frame_len);
+
+    /* parse header to know the length and other params */
+    if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, data) < 0))
+      goto parse_header_error;
+
+    /* after parsing the header we know the length of the data */
+    length = dvdemux->frame_len = dvdemux->decoder->frame_size;
+    if (dvdemux->decoder->system == e_dv_system_625_50) {
+      dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
+      dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
+    } else {
+      dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
+      dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
+    }
+    g_atomic_int_set (&dvdemux->found_header, 1);
+
+    /* let demux_video set the height, it needs to detect when things change so
+     * it can reset caps */
+
+    /* if we still have enough for a frame, start decoding */
+    if (G_LIKELY (gst_adapter_available (dvdemux->adapter) >= length)) {
+      GstBuffer *buffer;
+
+      data = gst_adapter_take (dvdemux->adapter, length);
+
+      /* create buffer for the remainder of the code */
+      buffer = gst_buffer_new ();
+      GST_BUFFER_DATA (buffer) = (guint8 *) data;
+      GST_BUFFER_SIZE (buffer) = length;
+      GST_BUFFER_MALLOCDATA (buffer) = (guint8 *) data;
+
+      /* and decode the buffer, takes ownership */
+      ret = gst_dvdemux_demux_frame (dvdemux, buffer);
+      if (G_UNLIKELY (ret != GST_FLOW_OK))
+        goto done;
+    }
+  }
+done:
+  return ret;
+
+  /* ERRORS */
+parse_header_error:
+  {
+    GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
+        (NULL), ("Error parsing DV header"));
+    return GST_FLOW_ERROR;
+  }
+}
+
+/* streaming operation: 
+ *
+ * accumulate data until we have a frame, then decode. 
+ */
+static GstFlowReturn
+gst_dvdemux_chain (GstPad * pad, GstBuffer * buffer)
+{
+  GstDVDemux *dvdemux;
+  GstFlowReturn ret;
+  GstClockTime timestamp;
+
+  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
+
+  /* a discontinuity in the stream, we need to get rid of
+   * accumulated data in the adapter and assume a new frame
+   * starts after the discontinuity */
+  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)))
+    gst_adapter_clear (dvdemux->adapter);
+
+  /* a timestamp always should be respected */
+  timestamp = GST_BUFFER_TIMESTAMP (buffer);
+  if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
+    gst_segment_set_last_stop (&dvdemux->time_segment, GST_FORMAT_TIME,
+        timestamp);
+    /* FIXME, adjust frame_offset and other counters */
+  }
+
+  gst_adapter_push (dvdemux->adapter, buffer);
+
+  /* Apparently dv_parse_header can read from the body of the frame
+   * too, so it needs more than header_size bytes. Wacky!
+   */
+  if (G_UNLIKELY (dvdemux->frame_len == -1)) {
+    /* if we don't know the length of a frame, we assume it is
+     * the NTSC_BUFFER length, as this is enough to figure out 
+     * if this is PAL or NTSC */
+    dvdemux->frame_len = NTSC_BUFFER;
+  }
+
+  /* and try to flush pending frames */
+  ret = gst_dvdemux_flush (dvdemux);
+
+  gst_object_unref (dvdemux);
+
+  return ret;
+}
+
+/* pull based operation.
+ *
+ * Read header first to figure out the frame size. Then read
+ * and decode full frames.
+ */
+static void
+gst_dvdemux_loop (GstPad * pad)
+{
+  GstFlowReturn ret;
+  GstDVDemux *dvdemux;
+  GstBuffer *buffer = NULL;
+  const guint8 *data;
+
+  dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
+
+  if (G_UNLIKELY (g_atomic_int_get (&dvdemux->found_header) == 0)) {
+    GST_DEBUG_OBJECT (dvdemux, "pulling first buffer");
+    /* pull in NTSC sized buffer to figure out the frame
+     * length */
+    ret = gst_pad_pull_range (dvdemux->sinkpad,
+        dvdemux->byte_segment.last_stop, NTSC_BUFFER, &buffer);
+    if (G_UNLIKELY (ret != GST_FLOW_OK))
+      goto pause;
+
+    /* check buffer size, don't want to read small buffers */
+    if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < NTSC_BUFFER))
+      goto small_buffer;
+
+    data = GST_BUFFER_DATA (buffer);
+
+    /* parse header to know the length and other params */
+    if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, data) < 0))
+      goto parse_header_error;
+
+    /* after parsing the header we know the length of the data */
+    dvdemux->frame_len = dvdemux->decoder->frame_size;
+    if (dvdemux->decoder->system == e_dv_system_625_50) {
+      dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
+      dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
+    } else {
+      dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
+      dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
+    }
+    dvdemux->need_segment = TRUE;
+
+    /* see if we need to read a larger part */
+    if (dvdemux->frame_len != NTSC_BUFFER) {
+      gst_buffer_unref (buffer);
+      buffer = NULL;
+    }
+
+    {
+      GstEvent *event;
+
+      /* setting header and prrforming the seek must be atomic */
+      GST_OBJECT_LOCK (dvdemux);
+      /* got header now */
+      g_atomic_int_set (&dvdemux->found_header, 1);
+
+      /* now perform pending seek if any. */
+      event = dvdemux->seek_event;
+      if (event)
+        gst_event_ref (event);
+      GST_OBJECT_UNLOCK (dvdemux);
+
+      if (event) {
+        if (!gst_dvdemux_handle_pull_seek (dvdemux, dvdemux->videosrcpad,
+                event)) {
+          GST_ELEMENT_WARNING (dvdemux, STREAM, DECODE, (NULL),
+              ("Error perfoming initial seek"));
+        }
+        gst_event_unref (event);
+
+        /* and we need to pull a new buffer in all cases. */
+        if (buffer) {
+          gst_buffer_unref (buffer);
+          buffer = NULL;
+        }
+      }
+    }
+  }
+
+
+  if (G_UNLIKELY (dvdemux->pending_segment)) {
+
+    /* now send the newsegment */
+    GST_DEBUG_OBJECT (dvdemux, "Sending newsegment from");
+
+    gst_dvdemux_push_event (dvdemux, dvdemux->pending_segment);
+    dvdemux->pending_segment = NULL;
+  }
+
+  if (G_LIKELY (buffer == NULL)) {
+    GST_DEBUG_OBJECT (dvdemux, "pulling buffer at offset %" G_GINT64_FORMAT,
+        dvdemux->byte_segment.last_stop);
+
+    ret = gst_pad_pull_range (dvdemux->sinkpad,
+        dvdemux->byte_segment.last_stop, dvdemux->frame_len, &buffer);
+    if (ret != GST_FLOW_OK)
+      goto pause;
+
+    /* check buffer size, don't want to read small buffers */
+    if (GST_BUFFER_SIZE (buffer) < dvdemux->frame_len)
+      goto small_buffer;
+  }
+  /* and decode the buffer */
+  ret = gst_dvdemux_demux_frame (dvdemux, buffer);
+  if (G_UNLIKELY (ret != GST_FLOW_OK))
+    goto pause;
+
+  /* and position ourselves for the next buffer */
+  dvdemux->byte_segment.last_stop += dvdemux->frame_len;
+
+done:
+  gst_object_unref (dvdemux);
+
+  return;
+
+  /* ERRORS */
+parse_header_error:
+  {
+    GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
+        (NULL), ("Error parsing DV header"));
+    gst_buffer_unref (buffer);
+    dvdemux->running = FALSE;
+    gst_pad_pause_task (dvdemux->sinkpad);
+    gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
+    goto done;
+  }
+small_buffer:
+  {
+    GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
+        (NULL), ("Error reading buffer"));
+    gst_buffer_unref (buffer);
+    dvdemux->running = FALSE;
+    gst_pad_pause_task (dvdemux->sinkpad);
+    gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
+    goto done;
+  }
+pause:
+  {
+    GST_INFO_OBJECT (dvdemux, "pausing task, %s", gst_flow_get_name (ret));
+    dvdemux->running = FALSE;
+    gst_pad_pause_task (dvdemux->sinkpad);
+    if (ret == GST_FLOW_UNEXPECTED) {
+      GST_LOG_OBJECT (dvdemux, "got eos");
+      /* perform EOS logic */
+      if (dvdemux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) {
+        gst_element_post_message (GST_ELEMENT (dvdemux),
+            gst_message_new_segment_done (GST_OBJECT_CAST (dvdemux),
+                dvdemux->time_segment.format, dvdemux->time_segment.last_stop));
+      } else {
+        gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
+      }
+    } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
+      /* for fatal errors or not-linked we post an error message */
+      GST_ELEMENT_ERROR (dvdemux, STREAM, FAILED,
+          (NULL), ("streaming stopped, reason %s", gst_flow_get_name (ret)));
+      gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
+    }
+    goto done;
+  }
+}
+
+static gboolean
+gst_dvdemux_sink_activate_push (GstPad * sinkpad, gboolean active)
+{
+  GstDVDemux *demux = GST_DVDEMUX (gst_pad_get_parent (sinkpad));
+
+  if (active) {
+    demux->seek_handler = gst_dvdemux_handle_push_seek;
+  } else {
+    demux->seek_handler = NULL;
+  }
+  gst_object_unref (demux);
+
+  return TRUE;
+}
+
+static gboolean
+gst_dvdemux_sink_activate_pull (GstPad * sinkpad, gboolean active)
+{
+  GstDVDemux *demux = GST_DVDEMUX (gst_pad_get_parent (sinkpad));
+
+  if (active) {
+    demux->running = TRUE;
+    demux->seek_handler = gst_dvdemux_handle_pull_seek;
+    gst_pad_start_task (sinkpad, (GstTaskFunction) gst_dvdemux_loop, sinkpad);
+  } else {
+    demux->seek_handler = NULL;
+    gst_pad_stop_task (sinkpad);
+    demux->running = FALSE;
+  }
+
+  gst_object_unref (demux);
+
+  return TRUE;
+};
+
+/* decide on push or pull based scheduling */
+static gboolean
+gst_dvdemux_sink_activate (GstPad * sinkpad)
+{
+  gboolean ret;
+
+  if (gst_pad_check_pull_range (sinkpad))
+    ret = gst_pad_activate_pull (sinkpad, TRUE);
+  else
+    ret = gst_pad_activate_push (sinkpad, TRUE);
+
+  return ret;
+};
+
+static GstStateChangeReturn
+gst_dvdemux_change_state (GstElement * element, GstStateChange transition)
+{
+  GstDVDemux *dvdemux = GST_DVDEMUX (element);
+  GstStateChangeReturn ret;
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      dvdemux->decoder = dv_decoder_new (0, FALSE, FALSE);
+      dv_set_error_log (dvdemux->decoder, NULL);
+      gst_dvdemux_reset (dvdemux);
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+      break;
+    default:
+      break;
+  }
+
+  ret = parent_class->change_state (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_adapter_clear (dvdemux->adapter);
+      dv_decoder_free (dvdemux->decoder);
+      dvdemux->decoder = NULL;
+
+      gst_dvdemux_remove_pads (dvdemux);
+      break;
+    case GST_STATE_CHANGE_READY_TO_NULL:
+    {
+      GstEvent **event_p;
+
+      event_p = &dvdemux->seek_event;
+      gst_event_replace (event_p, NULL);
+      if (dvdemux->pending_segment)
+        gst_event_unref (dvdemux->pending_segment);
+      dvdemux->pending_segment = NULL;
+      break;
+    }
+    default:
+      break;
+  }
+  return ret;
+}