/* GStreamer Smart Video Encoder element

 * Copyright (C) <2010> Edward Hervey <bilboed@gmail.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., 51 Franklin St, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

/* TODO:

 * * Implement get_caps/set_caps (store/forward caps)

 * * Adjust template caps to the formats we can support

 **/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <string.h>

#include "gstsmartencoder.h"

GST_DEBUG_CATEGORY_STATIC (smart_encoder_debug);

#define GST_CAT_DEFAULT smart_encoder_debug

/* FIXME : Update this with new caps */

/* WARNING : We can only allow formats with closed-GOP */

#define ALLOWED_CAPS "video/x-h263;video/x-intel-h263;"\

  "video/mpeg,mpegversion=(int)1,systemstream=(boolean)false;"\

  "video/mpeg,mpegversion=(int)2,systemstream=(boolean)false;"

static GstStaticPadTemplate src_template =

GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS (ALLOWED_CAPS)

    );

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",

    GST_PAD_SINK,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS (ALLOWED_CAPS)

    );

static GQuark INTERNAL_ELEMENT;

/* GstSmartEncoder signals and args */

enum

{

  /* FILL ME */

  LAST_SIGNAL

};

enum

{

  PROP_0

      /* FILL ME */

};

static void

_do_init (void)

{

  INTERNAL_ELEMENT = g_quark_from_static_string ("internal-element");

};

G_DEFINE_TYPE_EXTENDED (GstSmartEncoder, gst_smart_encoder, GST_TYPE_ELEMENT, 0,

    _do_init ());

static void gst_smart_encoder_dispose (GObject * object);

static gboolean setup_recoder_pipeline (GstSmartEncoder * smart_encoder);

static GstFlowReturn gst_smart_encoder_chain (GstPad * pad, GstObject * parent,

    GstBuffer * buf);

static gboolean smart_encoder_sink_event (GstPad * pad, GstObject * parent,

    GstEvent * event);

static gboolean smart_encoder_sink_query (GstPad * pad, GstObject * parent,

    GstQuery * query);

static GstCaps *smart_encoder_sink_getcaps (GstPad * pad, GstCaps * filter);

static GstStateChangeReturn

gst_smart_encoder_change_state (GstElement * element,

    GstStateChange transition);

static void

gst_smart_encoder_class_init (GstSmartEncoderClass * klass)

{

  GObjectClass *gobject_class;

  GstElementClass *element_class;

  element_class = (GstElementClass *) klass;

  gobject_class = G_OBJECT_CLASS (klass);

  gst_smart_encoder_parent_class = g_type_class_peek_parent (klass);

  gst_element_class_add_static_pad_template (element_class, &src_template);

  gst_element_class_add_static_pad_template (element_class, &sink_template);

  gst_element_class_set_static_metadata (element_class, "Smart Video Encoder",

      "Codec/Recoder/Video",

      "Re-encodes portions of Video that lay on segment boundaries",

      "Edward Hervey <bilboed@gmail.com>");

  gobject_class->dispose = (GObjectFinalizeFunc) (gst_smart_encoder_dispose);

  element_class->change_state = gst_smart_encoder_change_state;

  GST_DEBUG_CATEGORY_INIT (smart_encoder_debug, "smartencoder", 0,

      "Smart Encoder");

}

static void

smart_encoder_reset (GstSmartEncoder * smart_encoder)

{

  gst_segment_init (smart_encoder->segment, GST_FORMAT_UNDEFINED);

  if (smart_encoder->encoder) {

    /* Clean up/remove elements */

    gst_element_set_state (smart_encoder->encoder, GST_STATE_NULL);

    gst_element_set_state (smart_encoder->decoder, GST_STATE_NULL);

    gst_element_set_bus (smart_encoder->encoder, NULL);

    gst_element_set_bus (smart_encoder->decoder, NULL);

    gst_pad_set_active (smart_encoder->internal_srcpad, FALSE);

    gst_pad_set_active (smart_encoder->internal_sinkpad, FALSE);

    gst_object_unref (smart_encoder->encoder);

    gst_object_unref (smart_encoder->decoder);

    gst_object_unref (smart_encoder->internal_srcpad);

    gst_object_unref (smart_encoder->internal_sinkpad);

    smart_encoder->encoder = NULL;

    smart_encoder->decoder = NULL;

    smart_encoder->internal_sinkpad = NULL;

    smart_encoder->internal_srcpad = NULL;

  }

  if (smart_encoder->newsegment) {

    gst_event_unref (smart_encoder->newsegment);

    smart_encoder->newsegment = NULL;

  }

}

static void

gst_smart_encoder_init (GstSmartEncoder * smart_encoder)

{

  smart_encoder->sinkpad =

      gst_pad_new_from_static_template (&sink_template, "sink");

  gst_pad_set_chain_function (smart_encoder->sinkpad, gst_smart_encoder_chain);

  gst_pad_set_event_function (smart_encoder->sinkpad, smart_encoder_sink_event);

  gst_pad_set_query_function (smart_encoder->sinkpad, smart_encoder_sink_query);

  gst_element_add_pad (GST_ELEMENT (smart_encoder), smart_encoder->sinkpad);

  smart_encoder->srcpad =

      gst_pad_new_from_static_template (&src_template, "src");

  gst_pad_use_fixed_caps (smart_encoder->srcpad);

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

  smart_encoder->segment = gst_segment_new ();

  smart_encoder_reset (smart_encoder);

}

void

gst_smart_encoder_dispose (GObject * object)

{

  GstSmartEncoder *smart_encoder = (GstSmartEncoder *) object;

  if (smart_encoder->segment)

    gst_segment_free (smart_encoder->segment);

  smart_encoder->segment = NULL;

  if (smart_encoder->available_caps)

    gst_caps_unref (smart_encoder->available_caps);

  smart_encoder->available_caps = NULL;

  G_OBJECT_CLASS (gst_smart_encoder_parent_class)->dispose (object);

}

static GstFlowReturn

gst_smart_encoder_reencode_gop (GstSmartEncoder * smart_encoder)

{

  GstFlowReturn res = GST_FLOW_OK;

  GList *tmp;

  if (smart_encoder->encoder == NULL) {

    if (!setup_recoder_pipeline (smart_encoder))

      return GST_FLOW_ERROR;

  }

  /* Activate elements */

  /* Set elements to PAUSED */

  gst_element_set_state (smart_encoder->encoder, GST_STATE_PAUSED);

  gst_element_set_state (smart_encoder->decoder, GST_STATE_PAUSED);

  GST_INFO ("Pushing Flush start/stop to clean decoder/encoder");

  gst_pad_push_event (smart_encoder->internal_srcpad,

      gst_event_new_flush_start ());

  gst_pad_push_event (smart_encoder->internal_srcpad,

      gst_event_new_flush_stop (TRUE));

  /* push newsegment */

  GST_INFO ("Pushing newsegment %" GST_PTR_FORMAT, smart_encoder->newsegment);

  gst_pad_push_event (smart_encoder->internal_srcpad,

      gst_event_ref (smart_encoder->newsegment));

  /* Push buffers through our pads */

  GST_DEBUG ("Pushing pending buffers");

  for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {

    GstBuffer *buf = (GstBuffer *) tmp->data;

    res = gst_pad_push (smart_encoder->internal_srcpad, buf);

    if (G_UNLIKELY (res != GST_FLOW_OK))

      break;

  }

  if (G_UNLIKELY (res != GST_FLOW_OK)) {

    GST_WARNING ("Error pushing pending buffers : %s", gst_flow_get_name (res));

    /* Remove pending bfufers */

    for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {

      gst_buffer_unref ((GstBuffer *) tmp->data);

    }

  } else {

    GST_INFO ("Pushing out EOS to flush out decoder/encoder");

    gst_pad_push_event (smart_encoder->internal_srcpad, gst_event_new_eos ());

  }

  /* Activate elements */

  /* Set elements to PAUSED */

  gst_element_set_state (smart_encoder->encoder, GST_STATE_NULL);

  gst_element_set_state (smart_encoder->decoder, GST_STATE_NULL);

  g_list_free (smart_encoder->pending_gop);

  smart_encoder->pending_gop = NULL;

  return res;

}

static GstFlowReturn

gst_smart_encoder_push_pending_gop (GstSmartEncoder * smart_encoder)

{

  guint64 cstart, cstop;

  GList *tmp;

  GstFlowReturn res = GST_FLOW_OK;

  GST_DEBUG ("Pushing pending GOP (%" GST_TIME_FORMAT " -- %" GST_TIME_FORMAT

      ")", GST_TIME_ARGS (smart_encoder->gop_start),

      GST_TIME_ARGS (smart_encoder->gop_stop));

  /* If GOP is entirely within segment, just push downstream */

  if (gst_segment_clip (smart_encoder->segment, GST_FORMAT_TIME,

          smart_encoder->gop_start, smart_encoder->gop_stop, &cstart, &cstop)) {

    if ((cstart != smart_encoder->gop_start)

        || (cstop != smart_encoder->gop_stop)) {

      GST_DEBUG ("GOP needs to be re-encoded from %" GST_TIME_FORMAT " to %"

          GST_TIME_FORMAT, GST_TIME_ARGS (cstart), GST_TIME_ARGS (cstop));

      res = gst_smart_encoder_reencode_gop (smart_encoder);

    } else {

      /* The whole GOP is within the segment, push all pending buffers downstream */

      GST_DEBUG ("GOP doesn't need to be modified, pushing downstream");

      for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {

        GstBuffer *buf = (GstBuffer *) tmp->data;

        res = gst_pad_push (smart_encoder->srcpad, buf);

        if (G_UNLIKELY (res != GST_FLOW_OK))

          break;

      }

    }

  } else {

    /* The whole GOP is outside the segment, there's most likely

     * a bug somewhere. */

    GST_WARNING

        ("GOP is entirely outside of the segment, upstream gave us too much data");

    for (tmp = smart_encoder->pending_gop; tmp; tmp = tmp->next) {

      gst_buffer_unref ((GstBuffer *) tmp->data);

    }

  }

  if (smart_encoder->pending_gop) {

    g_list_free (smart_encoder->pending_gop);

    smart_encoder->pending_gop = NULL;

  }

  smart_encoder->gop_start = GST_CLOCK_TIME_NONE;

  smart_encoder->gop_stop = GST_CLOCK_TIME_NONE;

  return res;

}

static GstFlowReturn

gst_smart_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)

{

  GstSmartEncoder *smart_encoder;

  GstFlowReturn res = GST_FLOW_OK;

  gboolean discont, keyframe;

  smart_encoder = GST_SMART_ENCODER (parent);

  discont = GST_BUFFER_IS_DISCONT (buf);

  keyframe = !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);

  GST_DEBUG ("New buffer %s %s %" GST_TIME_FORMAT,

      discont ? "discont" : "",

      keyframe ? "keyframe" : "", GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));

  if (keyframe) {

    GST_DEBUG ("Got a keyframe");

    /* If there's a pending GOP, flush it out */

    if (smart_encoder->pending_gop) {

      /* Mark gop_stop */

      smart_encoder->gop_stop = GST_BUFFER_TIMESTAMP (buf);

      /* flush pending */

      res = gst_smart_encoder_push_pending_gop (smart_encoder);

      if (G_UNLIKELY (res != GST_FLOW_OK))

        goto beach;

    }

    /* Mark gop_start for new gop */

    smart_encoder->gop_start = GST_BUFFER_TIMESTAMP (buf);

  }

  /* Store buffer */

  smart_encoder->pending_gop = g_list_append (smart_encoder->pending_gop, buf);

  /* Update GOP stop position */

  if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {

    smart_encoder->gop_stop = GST_BUFFER_TIMESTAMP (buf);

    if (GST_BUFFER_DURATION_IS_VALID (buf))

      smart_encoder->gop_stop += GST_BUFFER_DURATION (buf);

  }

  GST_DEBUG ("Buffer stored , Current GOP : %" GST_TIME_FORMAT " -- %"

      GST_TIME_FORMAT, GST_TIME_ARGS (smart_encoder->gop_start),

      GST_TIME_ARGS (smart_encoder->gop_stop));

beach:

  return res;

}

static gboolean

smart_encoder_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)

{

  gboolean res = TRUE;

  GstSmartEncoder *smart_encoder = GST_SMART_ENCODER (parent);

  switch (GST_EVENT_TYPE (event)) {

    case GST_EVENT_FLUSH_STOP:

      smart_encoder_reset (smart_encoder);

      break;

    case GST_EVENT_SEGMENT:

    {

      gst_event_copy_segment (event, smart_encoder->segment);

      GST_DEBUG_OBJECT (smart_encoder, "segment: %" GST_SEGMENT_FORMAT,

          smart_encoder->segment);

      if (smart_encoder->segment->format != GST_FORMAT_TIME) {

        GST_ERROR

            ("smart_encoder can not handle streams not specified in GST_FORMAT_TIME");

        gst_event_unref (event);

        return FALSE;

      }

      /* And keep a copy for further usage */

      if (smart_encoder->newsegment)

        gst_event_unref (smart_encoder->newsegment);

      smart_encoder->newsegment = gst_event_ref (event);

    }

      break;

    case GST_EVENT_EOS:

      GST_DEBUG ("Eos, flushing remaining data");

      if (smart_encoder->segment->format == GST_FORMAT_TIME)

        gst_smart_encoder_push_pending_gop (smart_encoder);

      break;

    default:

      break;

  }

  res = gst_pad_push_event (smart_encoder->srcpad, event);

  return res;

}

static GstCaps *

smart_encoder_sink_getcaps (GstPad * pad, GstCaps * filter)

{

  GstCaps *peer, *tmpl, *res;

  GstSmartEncoder *smart_encoder = GST_SMART_ENCODER (gst_pad_get_parent (pad));

  /* Use computed caps */

  if (smart_encoder->available_caps)

    tmpl = gst_caps_ref (smart_encoder->available_caps);

  else

    tmpl = gst_static_pad_template_get_caps (&src_template);

  /* Try getting it from downstream */

  peer = gst_pad_peer_query_caps (smart_encoder->srcpad, tmpl);

  if (peer == NULL) {

    res = tmpl;

  } else {

    res = peer;

    gst_caps_unref (tmpl);

  }

  gst_object_unref (smart_encoder);

  return res;

}

static gboolean

smart_encoder_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)

{

  gboolean res;

  switch (GST_QUERY_TYPE (query)) {

    case GST_QUERY_CAPS:

    {

      GstCaps *filter, *caps;

      gst_query_parse_caps (query, &filter);

      caps = smart_encoder_sink_getcaps (pad, filter);

      gst_query_set_caps_result (query, caps);

      gst_caps_unref (caps);

      res = TRUE;

      break;

    }

    default:

      res = gst_pad_query_default (pad, parent, query);

      break;

  }

  return res;

}

/*****************************************

 *    Internal encoder/decoder pipeline  *

 ******************************************/

static GstElementFactory *

get_decoder_factory (GstCaps * caps)

{

  GstElementFactory *fact = NULL;

  GList *decoders, *tmp;

  tmp =

      gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_DECODER,

      GST_RANK_MARGINAL);

  decoders = gst_element_factory_list_filter (tmp, caps, GST_PAD_SINK, FALSE);

  gst_plugin_feature_list_free (tmp);

  for (tmp = decoders; tmp; tmp = tmp->next) {

    /* We just pick the first one */

    fact = (GstElementFactory *) tmp->data;

    gst_object_ref (fact);

    break;

  }

  gst_plugin_feature_list_free (decoders);

  return fact;

}

static GstElementFactory *

get_encoder_factory (GstCaps * caps)

{

  GstElementFactory *fact = NULL;

  GList *encoders, *tmp;

  tmp =

      gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_ENCODER,

      GST_RANK_MARGINAL);

  encoders = gst_element_factory_list_filter (tmp, caps, GST_PAD_SRC, FALSE);

  gst_plugin_feature_list_free (tmp);

  for (tmp = encoders; tmp; tmp = tmp->next) {

    /* We just pick the first one */

    fact = (GstElementFactory *) tmp->data;

    gst_object_ref (fact);

    break;

  }

  gst_plugin_feature_list_free (encoders);

  return fact;

}

static GstElement *

get_decoder (GstCaps * caps)

{

  GstElementFactory *fact = get_decoder_factory (caps);

  GstElement *res = NULL;

  if (fact) {

    res = gst_element_factory_create (fact, "internal-decoder");

    gst_object_unref (fact);

  }

  return res;

}

static GstElement *

get_encoder (GstCaps * caps)

{

  GstElementFactory *fact = get_encoder_factory (caps);

  GstElement *res = NULL;

  if (fact) {

    res = gst_element_factory_create (fact, "internal-encoder");

    gst_object_unref (fact);

  }

  return res;

}

static GstFlowReturn

internal_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)

{

  GstSmartEncoder *smart_encoder =

      g_object_get_qdata ((GObject *) pad, INTERNAL_ELEMENT);

  return gst_pad_push (smart_encoder->srcpad, buf);

}

static gboolean

setup_recoder_pipeline (GstSmartEncoder * smart_encoder)

{

  GstPad *tmppad;

  GstCaps *caps;

  /* Fast path */

  if (G_UNLIKELY (smart_encoder->encoder))

    return TRUE;

  GST_DEBUG ("Creating internal decoder and encoder");

  /* Create decoder/encoder */

  caps = gst_pad_get_current_caps (smart_encoder->sinkpad);

  smart_encoder->decoder = get_decoder (caps);

  if (G_UNLIKELY (smart_encoder->decoder == NULL))

    goto no_decoder;

  gst_caps_unref (caps);

  gst_element_set_bus (smart_encoder->decoder, GST_ELEMENT_BUS (smart_encoder));

  caps = gst_pad_get_current_caps (smart_encoder->sinkpad);

  smart_encoder->encoder = get_encoder (caps);

  if (G_UNLIKELY (smart_encoder->encoder == NULL))

    goto no_encoder;

  gst_caps_unref (caps);

  gst_element_set_bus (smart_encoder->encoder, GST_ELEMENT_BUS (smart_encoder));

  GST_DEBUG ("Creating internal pads");

  /* Create internal pads */

  /* Source pad which we'll use to feed data to decoders */

  smart_encoder->internal_srcpad = gst_pad_new ("internal_src", GST_PAD_SRC);

  g_object_set_qdata ((GObject *) smart_encoder->internal_srcpad,

      INTERNAL_ELEMENT, smart_encoder);

  gst_pad_set_active (smart_encoder->internal_srcpad, TRUE);

  /* Sink pad which will get the buffers from the encoder.

   * Note: We don't need an event function since we'll be discarding all

   * of them. */

  smart_encoder->internal_sinkpad = gst_pad_new ("internal_sink", GST_PAD_SINK);

  g_object_set_qdata ((GObject *) smart_encoder->internal_sinkpad,

      INTERNAL_ELEMENT, smart_encoder);

  gst_pad_set_chain_function (smart_encoder->internal_sinkpad, internal_chain);

  gst_pad_set_active (smart_encoder->internal_sinkpad, TRUE);

  GST_DEBUG ("Linking pads to elements");

  /* Link everything */

  tmppad = gst_element_get_static_pad (smart_encoder->encoder, "src");

  if (GST_PAD_LINK_FAILED (gst_pad_link (tmppad,

              smart_encoder->internal_sinkpad)))

    goto sinkpad_link_fail;

  gst_object_unref (tmppad);

  if (!gst_element_link (smart_encoder->decoder, smart_encoder->encoder))

    goto encoder_decoder_link_fail;

  tmppad = gst_element_get_static_pad (smart_encoder->decoder, "sink");

  if (GST_PAD_LINK_FAILED (gst_pad_link (smart_encoder->internal_srcpad,

              tmppad)))

    goto srcpad_link_fail;

  gst_object_unref (tmppad);

  GST_DEBUG ("Done creating internal elements/pads");

  return TRUE;

no_decoder:

  {

    GST_WARNING ("Couldn't find a decoder for %" GST_PTR_FORMAT, caps);

    gst_caps_unref (caps);

    return FALSE;

  }

no_encoder:

  {

    GST_WARNING ("Couldn't find an encoder for %" GST_PTR_FORMAT, caps);

    gst_caps_unref (caps);

    return FALSE;

  }

srcpad_link_fail:

  {

    gst_object_unref (tmppad);

    GST_WARNING ("Couldn't link internal srcpad to decoder");

    return FALSE;

  }

sinkpad_link_fail:

  {

    gst_object_unref (tmppad);

    GST_WARNING ("Couldn't link encoder to internal sinkpad");

    return FALSE;

  }

encoder_decoder_link_fail:

  {

    GST_WARNING ("Couldn't link decoder to encoder");

    return FALSE;

  }

}

static GstStateChangeReturn

gst_smart_encoder_find_elements (GstSmartEncoder * smart_encoder)

{

  guint i, n;

  GstCaps *tmpl, *st, *res;

  GstElementFactory *dec, *enc;

  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

  if (G_UNLIKELY (smart_encoder->available_caps))

    goto beach;

  /* Iterate over all pad template caps and see if we have both an

   * encoder and a decoder for those media types */

  tmpl = gst_static_pad_template_get_caps (&src_template);

  res = gst_caps_new_empty ();

  n = gst_caps_get_size (tmpl);

  for (i = 0; i < n; i++) {

    st = gst_caps_copy_nth (tmpl, i);

    GST_DEBUG_OBJECT (smart_encoder,

        "Checking for available decoder and encoder for %" GST_PTR_FORMAT, st);

    if (!(dec = get_decoder_factory (st))) {

      gst_caps_unref (st);

      continue;

    }

    gst_object_unref (dec);

    if (!(enc = get_encoder_factory (st))) {

      gst_caps_unref (st);

      continue;

    }

    gst_object_unref (enc);

    GST_DEBUG_OBJECT (smart_encoder, "OK");

    gst_caps_append (res, st);

  }

  gst_caps_unref (tmpl);

  if (gst_caps_is_empty (res)) {

    gst_caps_unref (res);

    ret = GST_STATE_CHANGE_FAILURE;

  } else

    smart_encoder->available_caps = res;

  GST_DEBUG_OBJECT (smart_encoder, "Done, available_caps:%" GST_PTR_FORMAT,

      smart_encoder->available_caps);

beach:

  return ret;

}

/******************************************

 *    GstElement vmethod implementations  *

 ******************************************/

static GstStateChangeReturn

gst_smart_encoder_change_state (GstElement * element, GstStateChange transition)

{

  GstSmartEncoder *smart_encoder;

  GstStateChangeReturn ret;

  g_return_val_if_fail (GST_IS_SMART_ENCODER (element),

      GST_STATE_CHANGE_FAILURE);

  smart_encoder = GST_SMART_ENCODER (element);

  switch (transition) {

    case GST_STATE_CHANGE_NULL_TO_READY:

      /* Figure out which elements are available  */

      if ((ret =

              gst_smart_encoder_find_elements (smart_encoder)) ==

          GST_STATE_CHANGE_FAILURE)

        goto beach;

      break;

    default:

      break;

  }

  ret =

      GST_ELEMENT_CLASS (gst_smart_encoder_parent_class)->change_state (element,

      transition);

  switch (transition) {

    case GST_STATE_CHANGE_PAUSED_TO_READY:

      smart_encoder_reset (smart_encoder);

      break;

    default:

      break;

  }

beach:

  return ret;

}