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gstbasevideoparse.c

/* Schrodinger
 * Copyright (C) 2006 David Schleef <ds@schleef.org>
 *
 * 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 "gstbasevideoparse.h"

#include <string.h>
#include <math.h>

GST_DEBUG_CATEGORY_EXTERN (basevideo_debug);
#define GST_CAT_DEFAULT basevideo_debug



/* GstBaseVideoParse signals and args */
enum
{
  LAST_SIGNAL
};

enum
{
  ARG_0
};

static void gst_base_video_parse_finalize (GObject *object);

static const GstQueryType *gst_base_video_parse_get_query_types (GstPad *pad);
static gboolean gst_base_video_parse_src_query (GstPad *pad, GstQuery *query);
static gboolean gst_base_video_parse_sink_query (GstPad *pad, GstQuery *query);
static gboolean gst_base_video_parse_src_event (GstPad *pad, GstEvent *event);
static gboolean gst_base_video_parse_sink_event (GstPad *pad, GstEvent *event);
static GstStateChangeReturn gst_base_video_parse_change_state (GstElement *element,
    GstStateChange transition);
static GstFlowReturn gst_base_video_parse_push_all (GstBaseVideoParse *base_video_parse, 
    gboolean at_eos);
static GstFlowReturn gst_base_video_parse_chain (GstPad *pad, GstBuffer *buf);
static void
gst_base_video_parse_free_frame (GstVideoFrame *frame);
static GstVideoFrame *
gst_base_video_parse_new_frame (GstBaseVideoParse *base_video_parse);


GST_BOILERPLATE (GstBaseVideoParse, gst_base_video_parse,
    GstBaseVideoCodec, GST_TYPE_BASE_VIDEO_CODEC);

static void
gst_base_video_parse_base_init (gpointer g_class)
{

}

static void
gst_base_video_parse_class_init (GstBaseVideoParseClass *klass)
{
  GObjectClass *gobject_class;
  GstElementClass *element_class;

  gobject_class = G_OBJECT_CLASS (klass);
  element_class = GST_ELEMENT_CLASS (klass);

  gobject_class->finalize = gst_base_video_parse_finalize;

  element_class->change_state = gst_base_video_parse_change_state;
}

static void
gst_base_video_parse_init (GstBaseVideoParse *base_video_parse, GstBaseVideoParseClass *klass)
{
  GstPad *pad;

  GST_DEBUG ("gst_base_video_parse_init");

  pad = GST_BASE_VIDEO_CODEC_SINK_PAD (base_video_parse);

  gst_pad_set_chain_function (pad, gst_base_video_parse_chain);
  gst_pad_set_query_function (pad, gst_base_video_parse_sink_query);
  gst_pad_set_event_function (pad, gst_base_video_parse_sink_event);

  pad = GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_parse);

  gst_pad_set_query_type_function (pad, gst_base_video_parse_get_query_types);
  gst_pad_set_query_function (pad, gst_base_video_parse_src_query);
  gst_pad_set_event_function (pad, gst_base_video_parse_src_event);

  base_video_parse->input_adapter = gst_adapter_new ();
  base_video_parse->output_adapter = gst_adapter_new ();

  base_video_parse->reorder_depth = 1;

  base_video_parse->current_frame =
    gst_base_video_parse_new_frame (base_video_parse);
}

static void
gst_base_video_parse_reset (GstBaseVideoParse *base_video_parse)
{
  GST_DEBUG("reset");

  base_video_parse->discont = TRUE;
  base_video_parse->have_sync = FALSE;

  base_video_parse->system_frame_number = 0;
  base_video_parse->presentation_frame_number = 0;

  if (base_video_parse->caps) {
    gst_caps_unref (base_video_parse->caps);
    base_video_parse->caps = NULL;
  }

  gst_segment_init (&base_video_parse->state.segment, GST_FORMAT_TIME);
  gst_adapter_clear (base_video_parse->input_adapter);
  gst_adapter_clear (base_video_parse->output_adapter);

  if (base_video_parse->current_frame) {
    gst_base_video_parse_free_frame (base_video_parse->current_frame);
  }
  base_video_parse->current_frame =
    gst_base_video_parse_new_frame (base_video_parse);

}

static void
gst_base_video_parse_finalize (GObject *object)
{
  GstBaseVideoParse *base_video_parse;

  g_return_if_fail (GST_IS_BASE_VIDEO_PARSE (object));
  base_video_parse = GST_BASE_VIDEO_PARSE (object);

  if (base_video_parse->input_adapter) {
    g_object_unref (base_video_parse->input_adapter);
  }
  if (base_video_parse->output_adapter) {
    g_object_unref (base_video_parse->output_adapter);
  }

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static const GstQueryType *
gst_base_video_parse_get_query_types (GstPad *pad)
{
  static const GstQueryType query_types[] = {
    GST_QUERY_POSITION,
    GST_QUERY_DURATION,
    GST_QUERY_CONVERT,
    0
  };

  return query_types;
}

#if 0
static gboolean
gst_base_video_parse_src_convert (GstPad *pad,
    GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 *dest_value)
{
  gboolean res;
  GstBaseVideoParse *dec;

  if (src_format == *dest_format) {
    *dest_value = src_value;
    return TRUE;
  }

  dec = GST_BASE_VIDEO_PARSE (gst_pad_get_parent (pad));

  if (src_format == GST_FORMAT_DEFAULT && *dest_format == GST_FORMAT_TIME) {
    if (dec->fps_d != 0) {
      *dest_value = gst_util_uint64_scale (granulepos_to_frame (src_value),
          dec->fps_d * GST_SECOND, dec->fps_n);
      res = TRUE;
    } else {
      res = FALSE;
    }
  } else {
    GST_WARNING ("unhandled conversion from %d to %d", src_format, *dest_format);
    res = FALSE;
  }

  gst_object_unref (dec);

  return res;
}

static gboolean
gst_base_video_parse_sink_convert (GstPad *pad,
    GstFormat src_format, gint64 src_value,
    GstFormat * dest_format, gint64 *dest_value)
{
  gboolean res = TRUE;
  GstBaseVideoParse *dec;

  if (src_format == *dest_format) {
    *dest_value = src_value;
    return TRUE;
  }

  dec = GST_BASE_VIDEO_PARSE (gst_pad_get_parent (pad));

  /* FIXME: check if we are in a decoding state */

  switch (src_format) {
    case GST_FORMAT_DEFAULT:
      switch (*dest_format) {
        case GST_FORMAT_TIME:
          *dest_value = gst_util_uint64_scale (src_value,
              dec->fps_d * GST_SECOND, dec->fps_n);
          break;
        default:
          res = FALSE;
      }
      break;
    case GST_FORMAT_TIME:
      switch (*dest_format) {
        case GST_FORMAT_DEFAULT:
        {
          *dest_value = gst_util_uint64_scale (src_value,
              dec->fps_n, dec->fps_d * GST_SECOND);
          break;
        }
        default:
          res = FALSE;
          break;
      }
      break;
    default:
      res = FALSE;
      break;
  }

  gst_object_unref (dec);

  return res;
}
#endif

static gboolean
gst_base_video_parse_src_query (GstPad *pad, GstQuery *query)
{
  GstBaseVideoParse *base_parse;
  gboolean res = FALSE;

  base_parse = GST_BASE_VIDEO_PARSE (gst_pad_get_parent(pad));

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_POSITION:
    {
      GstFormat format;
      gint64 time;
      gint64 value;

      gst_query_parse_position (query, &format, NULL);

      time = gst_util_uint64_scale (base_parse->presentation_frame_number,
              base_parse->state.fps_n, base_parse->state.fps_d);
      time += base_parse->state.segment.time;
      GST_DEBUG("query position %lld", time);
      res = gst_base_video_encoded_video_convert (&base_parse->state,
          GST_FORMAT_TIME, time, &format, &value);
      if (!res) goto error;

      gst_query_set_position (query, format, value);
      break;
    }
    case GST_QUERY_DURATION:
      res = gst_pad_query (GST_PAD_PEER (
            GST_BASE_VIDEO_CODEC_SINK_PAD(base_parse)), query);
      if (!res) goto error;
      break;
    case GST_QUERY_CONVERT:
    {
      GstFormat src_fmt, dest_fmt;
      gint64 src_val, dest_val;

      GST_WARNING ("query convert");

      gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
      res = gst_base_video_encoded_video_convert (&base_parse->state,
          src_fmt, src_val, &dest_fmt, &dest_val);
      if (!res) 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;
  }
done:
  gst_object_unref (base_parse);

  return res;
error:
  GST_DEBUG_OBJECT (base_parse, "query failed");
  goto done;
}

static gboolean
gst_base_video_parse_sink_query (GstPad *pad, GstQuery *query)
{
  GstBaseVideoParse *base_video_parse;
  gboolean res = FALSE;

  base_video_parse = GST_BASE_VIDEO_PARSE (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);
      res = gst_base_video_encoded_video_convert (&base_video_parse->state,
          src_fmt, src_val, &dest_fmt, &dest_val);
      if (!res) 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;
  }
done:
  gst_object_unref (base_video_parse);

  return res;
error:
  GST_DEBUG_OBJECT (base_video_parse, "query failed");
  goto done;
}

static gboolean
gst_base_video_parse_src_event (GstPad *pad, GstEvent *event)
{
  GstBaseVideoParse *base_video_parse;
  gboolean res = FALSE;

  base_video_parse = GST_BASE_VIDEO_PARSE (gst_pad_get_parent(pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_SEEK:
    {
      GstFormat format, tformat;
      gdouble rate;
      GstEvent *real_seek;
      GstSeekFlags flags;
      GstSeekType cur_type, stop_type;
      gint64 cur, stop;
      gint64 tcur, tstop;

      gst_event_parse_seek (event, &rate, &format, &flags, &cur_type,
          &cur, &stop_type, &stop);
      gst_event_unref (event);

      tformat = GST_FORMAT_TIME;
      res = gst_base_video_encoded_video_convert (&base_video_parse->state,
          format, cur, &tformat, &tcur);
      if (!res) goto convert_error;
      res = gst_base_video_encoded_video_convert (&base_video_parse->state,
          format, stop, &tformat, &tstop);
      if (!res) goto convert_error;

      real_seek = gst_event_new_seek (rate, GST_FORMAT_TIME,
          flags, cur_type, tcur, stop_type, tstop);

      res = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SINK_PAD(base_video_parse), real_seek);

      break;
    }
#if 0
    case GST_EVENT_QOS:
    {
      gdouble proportion;
      GstClockTimeDiff diff;
      GstClockTime timestamp;

      gst_event_parse_qos (event, &proportion, &diff, &timestamp);

      GST_OBJECT_LOCK (base_video_parse);
      base_video_parse->proportion = proportion;
      base_video_parse->earliest_time = timestamp + diff;
      GST_OBJECT_UNLOCK (base_video_parse);

      GST_DEBUG_OBJECT (base_video_parse, "got QoS %" GST_TIME_FORMAT ", %" G_GINT64_FORMAT,
          GST_TIME_ARGS(timestamp), diff);

      res = gst_pad_push_event (base_video_parse->sinkpad, event);
      break;
    }
#endif
    default:
      res = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SINK_PAD(base_video_parse), event);
      break;
  }
done:
  gst_object_unref (base_video_parse);
  return res;

convert_error:
  GST_DEBUG_OBJECT (base_video_parse, "could not convert format");
  goto done;
}

static gboolean
gst_base_video_parse_sink_event (GstPad *pad, GstEvent *event)
{
  GstBaseVideoParse *base_video_parse;
  gboolean ret = FALSE;

  base_video_parse = GST_BASE_VIDEO_PARSE (gst_pad_get_parent(pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_FLUSH_START:
      ret = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), event);
      break;
    case GST_EVENT_FLUSH_STOP:
      gst_base_video_parse_reset (base_video_parse);
      ret = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), event);
      break;
    case GST_EVENT_EOS:
      if (gst_base_video_parse_push_all (base_video_parse, FALSE) == GST_FLOW_ERROR) {
        gst_event_unref (event);
        return FALSE;
      }

      ret = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), event);
      break;
    case GST_EVENT_NEWSEGMENT:
    {
      gboolean update;
      GstFormat format;
      gdouble rate;
      gint64 start, stop, time;

      gst_event_parse_new_segment (event, &update, &rate, &format, &start,
          &stop, &time);

      if (format != GST_FORMAT_TIME)
        goto newseg_wrong_format;

      if (rate <= 0.0)
        goto newseg_wrong_rate;

      GST_DEBUG("newsegment %lld %lld", start, time);
      gst_segment_set_newsegment (&base_video_parse->state.segment, update,
          rate, format, start, stop, time);

      ret = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), event);
      break;
    }
    default:
      ret = gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), event);
      break;
  }
done:
  gst_object_unref (base_video_parse);
  return ret;

newseg_wrong_format:
  GST_DEBUG_OBJECT (base_video_parse, "received non TIME newsegment");
  gst_event_unref (event);
  goto done;

newseg_wrong_rate:
  GST_DEBUG_OBJECT (base_video_parse, "negative rates not supported");
  gst_event_unref (event);
  goto done;
}


static GstStateChangeReturn
gst_base_video_parse_change_state (GstElement *element, GstStateChange transition)
{
  GstBaseVideoParse *base_parse = GST_BASE_VIDEO_PARSE (element);
  GstStateChangeReturn ret;

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      break;
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      gst_base_video_parse_reset (base_parse);
      break;
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS(parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
      break;
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_base_video_parse_reset (base_parse);
      break;
    case GST_STATE_CHANGE_READY_TO_NULL:
      break;
    default:
      break;
  }

  return ret;
}

static guint64
gst_base_video_parse_get_timestamp (GstBaseVideoParse *base_video_parse,
    int picture_number)
{
  if (picture_number < 0) {
    return base_video_parse->timestamp_offset -
      (gint64)gst_util_uint64_scale (-picture_number,
          base_video_parse->state.fps_d * GST_SECOND, base_video_parse->state.fps_n);
  } else {
    return base_video_parse->timestamp_offset +
      gst_util_uint64_scale (picture_number,
          base_video_parse->state.fps_d * GST_SECOND, base_video_parse->state.fps_n);
  }
}

static GstFlowReturn
gst_base_video_parse_push_all (GstBaseVideoParse *base_video_parse, gboolean at_eos)
{
  GstFlowReturn ret = GST_FLOW_OK;

  /* FIXME do stuff */

  return ret;
}

static GstFlowReturn
gst_base_video_parse_chain (GstPad *pad, GstBuffer *buf)
{
  GstBaseVideoParse *base_video_parse;
  GstBaseVideoParseClass *klass;
  GstBuffer *buffer;
  GstFlowReturn ret;

  GST_DEBUG("chain with %d bytes", GST_BUFFER_SIZE(buf));

  base_video_parse = GST_BASE_VIDEO_PARSE (GST_PAD_PARENT (pad));
  klass = GST_BASE_VIDEO_PARSE_GET_CLASS (base_video_parse);

  if (!base_video_parse->started) {
    klass->start (base_video_parse);
    base_video_parse->started = TRUE;
  }

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))) {
    GST_DEBUG_OBJECT (base_video_parse, "received DISCONT buffer");
    gst_base_video_parse_reset (base_video_parse);
    base_video_parse->discont = TRUE;
    base_video_parse->have_sync = FALSE;
  }

  if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
    base_video_parse->last_timestamp = GST_BUFFER_TIMESTAMP (buf);
  }
  gst_adapter_push (base_video_parse->input_adapter, buf);

  if (!base_video_parse->have_sync) {
    int n, m;

    GST_DEBUG("no sync, scanning");

    n = gst_adapter_available (base_video_parse->input_adapter);
    m = klass->scan_for_sync (base_video_parse->input_adapter, FALSE, 0, n);
    
    gst_adapter_flush (base_video_parse->input_adapter, m);

    if (m < n) {
      GST_DEBUG("found possible sync after %d bytes (of %d)", m, n);

      /* this is only "maybe" sync */
      base_video_parse->have_sync = TRUE;
    }

    if (!base_video_parse->have_sync) {
      return GST_FLOW_OK;
    }
  }

  buffer = gst_adapter_get_buffer (base_video_parse->input_adapter);

  //base_video_parse->buffer_timestamp = GST_BUFFER_TIMESTAMP (buffer);
  gst_buffer_unref (buffer);

  /* FIXME check klass->parse_data */

  do {
    ret = klass->parse_data (base_video_parse, FALSE);
  } while (ret == GST_FLOW_OK);

  if (ret == GST_BASE_VIDEO_PARSE_FLOW_NEED_DATA) {
    return GST_FLOW_OK;
  }
  return ret;
}

GstVideoState *
gst_base_video_parse_get_state (GstBaseVideoParse *base_video_parse)
{
  return &base_video_parse->state;
}

void
gst_base_video_parse_set_state (GstBaseVideoParse *base_video_parse,
    GstVideoState *state)
{
  GST_DEBUG("set_state");

  memcpy (&base_video_parse->state, state, sizeof(GstVideoState));

  /* FIXME set caps */

}


gboolean
gst_base_video_parse_set_src_caps (GstBaseVideoParse *base_video_parse,
    GstCaps *caps)
{
  g_return_val_if_fail (GST_IS_BASE_VIDEO_PARSE(base_video_parse), FALSE);

  GST_DEBUG("set_src_caps");

  return gst_pad_set_caps (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), caps);
}

void
gst_base_video_parse_lost_sync (GstBaseVideoParse *base_video_parse)
{
  g_return_if_fail (GST_IS_BASE_VIDEO_PARSE(base_video_parse));

  GST_DEBUG("lost_sync");

  if (gst_adapter_available (base_video_parse->input_adapter) >= 1) {
    gst_adapter_flush (base_video_parse->input_adapter, 1);
  }

  base_video_parse->have_sync = FALSE;
}

GstVideoFrame *
gst_base_video_parse_get_frame (GstBaseVideoParse *base_video_parse)
{
  g_return_val_if_fail (GST_IS_BASE_VIDEO_PARSE(base_video_parse), NULL);

  return base_video_parse->current_frame;
}

void
gst_base_video_parse_add_to_frame (GstBaseVideoParse *base_video_parse,
    int n_bytes)
{
  GstBuffer *buf;

  GST_DEBUG("add_to_frame");

  buf = gst_adapter_take_buffer (base_video_parse->input_adapter, n_bytes);
  
  gst_adapter_push (base_video_parse->output_adapter, buf);
}

GstFlowReturn
gst_base_video_parse_finish_frame (GstBaseVideoParse *base_video_parse)
{
  GstVideoFrame *frame = base_video_parse->current_frame;
  GstBuffer *buffer;
  GstBaseVideoParseClass *base_video_parse_class;
  GstFlowReturn ret;

  GST_DEBUG("finish_frame");

  base_video_parse_class = GST_BASE_VIDEO_PARSE_GET_CLASS (base_video_parse);

  buffer = gst_adapter_take_buffer (base_video_parse->output_adapter,
      gst_adapter_available (base_video_parse->output_adapter));

  if (frame->is_sync_point) {
    base_video_parse->timestamp_offset = base_video_parse->last_timestamp -
      gst_util_uint64_scale (frame->presentation_frame_number,
          base_video_parse->state.fps_d * GST_SECOND,
          base_video_parse->state.fps_n);
    base_video_parse->distance_from_sync = 0;
  }

  frame->distance_from_sync = base_video_parse->distance_from_sync;
  base_video_parse->distance_from_sync++;

  frame->presentation_timestamp =
    gst_base_video_parse_get_timestamp(base_video_parse,
        frame->presentation_frame_number);
  frame->presentation_duration =
    gst_base_video_parse_get_timestamp(base_video_parse,
        frame->presentation_frame_number + 1) - frame->presentation_timestamp;
  frame->decode_timestamp =
    gst_base_video_parse_get_timestamp(base_video_parse,
        frame->decode_frame_number);

  GST_BUFFER_TIMESTAMP (buffer) = frame->presentation_timestamp;
  GST_BUFFER_DURATION (buffer) = frame->presentation_duration;
  if (frame->decode_frame_number < 0) {
    GST_BUFFER_OFFSET (buffer) = 0;
  } else {
    GST_BUFFER_OFFSET (buffer) = frame->decode_timestamp;
  }
  GST_BUFFER_OFFSET_END (buffer) = GST_CLOCK_TIME_NONE;

  GST_DEBUG("pts %" GST_TIME_FORMAT,
      GST_TIME_ARGS(frame->presentation_timestamp));
  GST_DEBUG("dts %" GST_TIME_FORMAT,
      GST_TIME_ARGS(frame->decode_timestamp));
  GST_DEBUG("dist %d", frame->distance_from_sync);

  if (frame->is_sync_point) {
    GST_BUFFER_FLAG_UNSET(buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  } else {
    GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  }

  frame->src_buffer = buffer;
  ret = base_video_parse_class->shape_output (base_video_parse, frame);

  gst_base_video_parse_free_frame (base_video_parse->current_frame);

  /* create new frame */
  base_video_parse->current_frame =
    gst_base_video_parse_new_frame (base_video_parse);

  return ret;
}

static void
gst_base_video_parse_free_frame (GstVideoFrame *frame)
{
  if (frame->sink_buffer) {
    gst_buffer_unref (frame->sink_buffer);
  }
#if 0
  if (frame->src_buffer) {
    gst_buffer_unref (frame->src_buffer);
  }
#endif

  g_free (frame);
}

static GstVideoFrame *
gst_base_video_parse_new_frame (GstBaseVideoParse *base_video_parse)
{
  GstVideoFrame * frame;

  frame = g_malloc0 (sizeof(GstVideoFrame));

  frame->system_frame_number = base_video_parse->system_frame_number;
  base_video_parse->system_frame_number++;

  frame->decode_frame_number = frame->system_frame_number -
    base_video_parse->reorder_depth;

  return frame;
}

void
gst_base_video_parse_set_sync_point (GstBaseVideoParse *base_video_parse)
{
  GST_DEBUG("set_sync_point");

  base_video_parse->current_frame->is_sync_point = TRUE;

  base_video_parse->distance_from_sync = 0;
}

GstFlowReturn
gst_base_video_parse_push (GstBaseVideoParse *base_video_parse,
    GstBuffer *buffer)
{
  GstBaseVideoParseClass *base_video_parse_class;

  base_video_parse_class = GST_BASE_VIDEO_PARSE_GET_CLASS (base_video_parse);

  if (base_video_parse->caps == NULL) {
    gboolean ret;

    base_video_parse->caps = base_video_parse_class->get_caps (base_video_parse);

    ret = gst_pad_set_caps (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse),
        base_video_parse->caps);

    if (!ret) {
      GST_WARNING("pad didn't accept caps");
      return GST_FLOW_ERROR;
    }
  }
  gst_buffer_set_caps (buffer, base_video_parse->caps);

  GST_DEBUG("pushing ts=%lld dur=%lld off=%lld off_end=%lld",
      GST_BUFFER_TIMESTAMP(buffer),
      GST_BUFFER_DURATION(buffer),
      GST_BUFFER_OFFSET(buffer),
      GST_BUFFER_OFFSET_END(buffer));

  if (base_video_parse->discont) {
    GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_FLAG_DISCONT);
    base_video_parse->discont = FALSE;
  } else {
    GST_BUFFER_FLAG_UNSET(buffer, GST_BUFFER_FLAG_DISCONT);
  }

  return gst_pad_push (GST_BASE_VIDEO_CODEC_SRC_PAD(base_video_parse), buffer);
}


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