/* GStreamer

 * Copyright (C) <2006> Renato Araujo Oliveira Filho <renato.filho@indt.org.br>

 *                      Rosfran Borges <rosfran.borges@indt.org.br>

 *

 * 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.

 */

/* Element-Checklist-Version: 5 */

/**

 * SECTION:element-nuvdemux

 *

 * <refsect2>

 * <para>

 * Demuxes an .nuv file into raw or compressed audio and/or video streams.

 * </para>

 * <para>

 * This element currently only supports pull-based scheduling.

 * </para>

 * <title>Example launch line</title>

 * <para>

 * <programlisting>

 * gst-launch filesrc test.nuv ! nuvdemux name=demux  demux.audio_00 ! decodebin ! audioconvert ! audioresample ! autoaudiosink   demux.video_00 ! queue ! decodebin ! ffmpegcolorspace ! videoscale ! autovideosink

 * </programlisting>

 * Play (parse and decode) an .nuv file and try to output it to

 * an automatically detected soundcard and videosink. If the NUV file contains

 * compressed audio or video data, this will only work if you have the

 * right decoder elements/plugins installed.

 * </para>

 * </refsect2>

 *

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gst/gst.h>

#include <gst/gsterror.h>

#include <gst/gstplugin.h>

#include <string.h>

#include "glib/gi18n.h"

#include "gstnuvdemux.h"

GST_DEBUG_CATEGORY_STATIC (nuvdemux_debug);

#define GST_CAT_DEFAULT nuvdemux_debug

#define GST_FLOW_ERROR_NO_DATA  -101

GST_DEBUG_CATEGORY_EXTERN (GST_CAT_EVENT);

static const GstElementDetails gst_nuv_demux_details =

GST_ELEMENT_DETAILS ("Nuv demuxer",

    "Codec/Demuxer",

    "Demultiplex a .nuv file into audio and video",

    "Renato Araujo Oliveira Filho <renato.filho@indt.org.br>,"

    "Rosfran Borges <rosfran.borges@indt.org.br>");

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",

    GST_PAD_SINK,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS ("video/x-nuv"));

static GstStaticPadTemplate audio_src_template =

GST_STATIC_PAD_TEMPLATE ("audio_src",

    GST_PAD_SRC,

    GST_PAD_SOMETIMES,

    GST_STATIC_CAPS_ANY);

static GstStaticPadTemplate video_src_template =

GST_STATIC_PAD_TEMPLATE ("video_src",

    GST_PAD_SRC,

    GST_PAD_SOMETIMES,

    GST_STATIC_CAPS_ANY);

/* NUV Demux plug-in time-line functions */

static void gst_nuv_demux_finalize (GObject * object);

static GstStateChangeReturn gst_nuv_demux_change_state (GstElement * element,

    GstStateChange transition);

static void gst_nuv_demux_loop (GstPad * pad);

static GstFlowReturn gst_nuv_demux_chain (GstPad * pad, GstBuffer * buf);

static GstFlowReturn gst_nuv_demux_play (GstPad * pad);

static gboolean gst_nuv_demux_sink_activate_pull (GstPad * sinkpad,

    gboolean active);

static gboolean gst_nuv_demux_sink_activate_push (GstPad * pad, 

    gboolean active);

static gboolean gst_nuv_demux_sink_activate (GstPad * sinkpad);

static GstFlowReturn gst_nuv_demux_read_bytes (GstNuvDemux * nuv, guint64 size,

    gboolean move, GstBuffer ** buffer);

static void gst_nuv_demux_reset (GstNuvDemux * nuv);

static void gst_nuv_demux_destoy_src_pad (GstNuvDemux * nuv);

static void gst_nuv_demux_send_eos (GstNuvDemux * nuv);

/* GObject methods */

GST_BOILERPLATE (GstNuvDemux, gst_nuv_demux, GstElement, GST_TYPE_ELEMENT);

#if G_BYTE_ORDER == G_BIG_ENDIAN

static inline gdouble

_gdouble_swap_le_be (gdouble * d)

{

  union

  {

    guint64 i;

    gdouble d;

  } u;

  u.d = *d;

  u.i = GUINT64_SWAP_LE_BE (u.i);

  return u.d;

}

#define READ_DOUBLE_FROM_LE(d) (_gdouble_swap_le_be((gdouble* ) d))

#else /* G_BYTE_ORDER != G_BIG_ENDIAN */

#define READ_DOUBLE_FROM_LE(d) *((gdouble* ) (d))

#endif /* G_BYTE_ORDER != G_BIG_ENDIAN */

static void

gst_nuv_demux_base_init (gpointer klass)

{

  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,

      gst_static_pad_template_get (&audio_src_template));

  gst_element_class_add_pad_template (element_class,

      gst_static_pad_template_get (&video_src_template));

  gst_element_class_add_pad_template (element_class,

      gst_static_pad_template_get (&sink_template));

  gst_element_class_set_details (element_class, &gst_nuv_demux_details);

}

static void

gst_nuv_demux_class_init (GstNuvDemuxClass * klass)

{

  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

  GObjectClass *gobject_class = (GObjectClass *) klass;

  GST_DEBUG_CATEGORY_INIT (nuvdemux_debug, "nuvdemux",

      0, "Demuxer for NUV streams");

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->finalize = gst_nuv_demux_finalize;

  gstelement_class->change_state = gst_nuv_demux_change_state;

}

static void

gst_nuv_demux_init (GstNuvDemux * nuv, GstNuvDemuxClass * nuv_class)

{

  nuv->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");

  gst_pad_set_activate_function (nuv->sinkpad, gst_nuv_demux_sink_activate);

  gst_pad_set_activatepull_function (nuv->sinkpad,

      gst_nuv_demux_sink_activate_pull);

  gst_pad_set_activatepush_function (nuv->sinkpad, 

      gst_nuv_demux_sink_activate_push);

  gst_pad_set_chain_function (nuv->sinkpad,

      GST_DEBUG_FUNCPTR (gst_nuv_demux_chain));

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

  nuv->adapter = NULL;

  nuv->mpeg_buffer = NULL;

  nuv->h = NULL;

  nuv->eh = NULL;

  nuv->fh = NULL;

  gst_nuv_demux_reset (nuv);

}

static void

gst_nuv_demux_finalize (GObject * object)

{

  GstNuvDemux *nuv = GST_NUV_DEMUX (object);

  if (nuv->mpeg_buffer != NULL) {

    gst_buffer_unref (nuv->mpeg_buffer);

  }

  gst_nuv_demux_destoy_src_pad (nuv);

  gst_nuv_demux_reset (nuv);

  if (nuv->adapter != NULL) {

    gst_object_unref (nuv->adapter);

  }

  G_OBJECT_CLASS (parent_class)->finalize (object);

}

/* HeaderLoad:

 */

static GstFlowReturn

gst_nuv_demux_header_load (GstNuvDemux * nuv, nuv_header ** h_ret)

{

  GstBuffer *buffer = NULL;

  GstFlowReturn res = gst_nuv_demux_read_bytes (nuv, 72, TRUE, &buffer);

  if (res != GST_FLOW_OK)

    return res;

  nuv_header *h = g_new0 (nuv_header, 1);

  memcpy (h->id, buffer->data, 12);

  memcpy (h->version, buffer->data + 12, 5);

  h->i_width = GST_READ_UINT32_LE (&buffer->data[20]);

  h->i_height = GST_READ_UINT32_LE (&buffer->data[24]);

  h->i_width_desired = GST_READ_UINT32_LE (&buffer->data[28]);

  h->i_height_desired = GST_READ_UINT32_LE (&buffer->data[32]);

  h->i_mode = GPOINTER_TO_INT (buffer->data[36]);

  h->d_aspect = READ_DOUBLE_FROM_LE (&buffer->data[40]);

  h->d_fps = READ_DOUBLE_FROM_LE (&buffer->data[48]);

  h->i_video_blocks = GST_READ_UINT32_LE (&buffer->data[56]);

  h->i_audio_blocks = GST_READ_UINT32_LE (&buffer->data[60]);

  h->i_text_blocks = GST_READ_UINT32_LE (&buffer->data[64]);

  h->i_keyframe_distance = GST_READ_UINT32_LE (&buffer->data[68]);

  GST_DEBUG_OBJECT (nuv,

      "nuv: h=%s v=%s %dx%d a=%f fps=%f v=%d a=%d t=%d kfd=%d", h->id,

      h->version, h->i_width, h->i_height, h->d_aspect, h->d_fps,

      h->i_video_blocks, h->i_audio_blocks, h->i_text_blocks,

      h->i_keyframe_distance);

  *h_ret = h;

  gst_buffer_unref (buffer);

  return res;

}

static GstFlowReturn

gst_nuv_demux_stream_header_data (GstNuvDemux * nuv)

{

  GstFlowReturn res = gst_nuv_demux_header_load (nuv, &nuv->h);

  if (res == GST_FLOW_OK)

    nuv->state = GST_NUV_DEMUX_EXTRA_DATA;

  return res;

}

/*

 * Read NUV file tag

 */

static GstFlowReturn

gst_nuv_demux_stream_file_header (GstNuvDemux * nuv)

{

  GstFlowReturn res = GST_FLOW_OK;

  GstBuffer *file_header = NULL;

  res = gst_nuv_demux_read_bytes (nuv, 12, FALSE, &file_header);

  if (res != GST_FLOW_OK) {

    return res;

  } else {

    if (strncmp ((gchar *) file_header->data, "MythTVVideo", 11) ||

        strncmp ((gchar *) file_header->data, "NuppelVideo", 11)) {

      nuv->state = GST_NUV_DEMUX_HEADER_DATA;

    } else {

      GST_DEBUG_OBJECT (nuv, "error parsing file header");

      nuv->state = GST_NUV_DEMUX_INVALID_DATA;

      res = GST_FLOW_ERROR;

    }

  }

  if (file_header != NULL) {

    gst_buffer_unref (file_header);

  }

  return res;

}

/* FrameHeaderLoad:

 */

static GstFlowReturn

gst_nuv_demux_frame_header_load (GstNuvDemux * nuv, nuv_frame_header ** h_ret)

{

  unsigned char *data;

  nuv_frame_header *h;

  GstBuffer *buf = NULL;

  GstFlowReturn res = gst_nuv_demux_read_bytes (nuv, 12, TRUE, &buf);

  if (res != GST_FLOW_OK) {

    if (buf != NULL) {

      gst_buffer_unref (buf);

    }

    return res;

  }

  h = g_new0 (nuv_frame_header, 1);

  data = buf->data;

  h->i_type = GPOINTER_TO_INT (data[0]);

  h->i_compression = GPOINTER_TO_INT (data[1]);

  h->i_keyframe = GPOINTER_TO_INT (data[2]);

  h->i_filters = GPOINTER_TO_INT (data[3]);

  h->i_timecode = GST_READ_UINT32_LE (&data[4]);

  h->i_length = GST_READ_UINT32_LE (&data[8]);

  GST_DEBUG_OBJECT (nuv, "frame hdr: t=%c c=%c k=%d f=0x%x timecode=%d l=%d",

      h->i_type,

      h->i_compression ? h->i_compression : ' ',

      h->i_keyframe ? h->i_keyframe : ' ',

      h->i_filters, h->i_timecode, h->i_length);

  *h_ret = h;

  gst_buffer_unref (buf);

  return GST_FLOW_OK;

}

static GstFlowReturn

gst_nuv_demux_extended_header_load (GstNuvDemux * nuv,

    nuv_extended_header ** h_ret)

{

  unsigned char *data;

  GstBuffer *buff = NULL;

  nuv_extended_header *h;

  GstFlowReturn res = gst_nuv_demux_read_bytes (nuv, 512, TRUE, &buff);

  if (res != GST_FLOW_OK) {

    if (buff != NULL) {

      gst_buffer_unref (buff);

    }

    return res;

  }

  h = g_new0 (nuv_extended_header, 1);

  data = buff->data;

  h->i_version = GST_READ_UINT32_LE (&data[0]);

  h->i_video_fcc = GST_MAKE_FOURCC (data[4], data[5], data[6], data[7]);

  h->i_audio_fcc = GST_MAKE_FOURCC (data[8], data[9], data[10], data[11]);

  h->i_audio_sample_rate = GST_READ_UINT32_LE (&data[12]);

  h->i_audio_bits_per_sample = GST_READ_UINT32_LE (&data[16]);

  h->i_audio_channels = GST_READ_UINT32_LE (&data[20]);

  h->i_audio_compression_ratio = GST_READ_UINT32_LE (&data[24]);

  h->i_audio_quality = GST_READ_UINT32_LE (&data[28]);

  h->i_rtjpeg_quality = GST_READ_UINT32_LE (&data[32]);

  h->i_rtjpeg_luma_filter = GST_READ_UINT32_LE (&data[36]);

  h->i_rtjpeg_chroma_filter = GST_READ_UINT32_LE (&data[40]);

  h->i_lavc_bitrate = GST_READ_UINT32_LE (&data[44]);

  h->i_lavc_qmin = GST_READ_UINT32_LE (&data[48]);

  h->i_lavc_qmin = GST_READ_UINT32_LE (&data[52]);

  h->i_lavc_maxqdiff = GST_READ_UINT32_LE (&data[56]);

  h->i_seekable_offset = GST_READ_UINT64_LE (&data[60]);

  h->i_keyframe_adjust_offset = GST_READ_UINT64_LE (&data[68]);

  GST_DEBUG_OBJECT (nuv,

      "ex hdr: v=%d vffc=%4.4s afcc=%4.4s %dHz %dbits ach=%d acr=%d aq=%d"

      "rtjpeg q=%d lf=%d lc=%d lavc br=%d qmin=%d qmax=%d maxqdiff=%d seekableoff=%lld keyfao=%lld",

      h->i_version, (gchar *) & h->i_video_fcc, (gchar *) & h->i_audio_fcc,

      h->i_audio_sample_rate, h->i_audio_bits_per_sample, h->i_audio_channels,

      h->i_audio_compression_ratio, h->i_audio_quality, h->i_rtjpeg_quality,

      h->i_rtjpeg_luma_filter, h->i_rtjpeg_chroma_filter, h->i_lavc_bitrate,

      h->i_lavc_qmin, h->i_lavc_qmax, h->i_lavc_maxqdiff, h->i_seekable_offset,

      h->i_keyframe_adjust_offset);

  *h_ret = h;

  gst_buffer_unref (buff);

  return res;

}

static void

gst_nuv_demux_create_pads (GstNuvDemux * nuv)

{

  if (nuv->h->i_video_blocks != 0) {

    GstCaps *video_caps = NULL;

    nuv->src_video_pad =

        gst_pad_new_from_static_template (&video_src_template, "video_src");

    video_caps = gst_caps_new_simple ("video/x-divx",

        "divxversion", G_TYPE_INT, 4,

        "width", G_TYPE_INT, nuv->h->i_width,

        "height", G_TYPE_INT, nuv->h->i_height,

        "framerate", GST_TYPE_FRACTION, (gint) (nuv->h->d_fps * 1000.0f), 1000,

        "format", GST_TYPE_FOURCC, nuv->eh->i_video_fcc,

        "pixel-aspect-ratio", GST_TYPE_FRACTION,

        (gint) (nuv->h->d_aspect * 1000.0f), 1000, NULL);

    gst_pad_use_fixed_caps (nuv->src_video_pad);

    gst_pad_set_caps (nuv->src_video_pad, video_caps);

    gst_pad_set_active (nuv->src_video_pad, TRUE);

    gst_element_add_pad (GST_ELEMENT (nuv), nuv->src_video_pad);

    gst_caps_unref (video_caps);

  }

  if (nuv->h->i_audio_blocks != 0) {

    GstCaps *audio_caps = NULL;

    nuv->src_audio_pad =

        gst_pad_new_from_static_template (&audio_src_template, "audio_src");

    audio_caps = gst_caps_new_simple ("audio/mpeg",

        "rate", G_TYPE_INT, nuv->eh->i_audio_sample_rate,

        "format", GST_TYPE_FOURCC, nuv->eh->i_audio_fcc,

        "channels", G_TYPE_INT, nuv->eh->i_audio_channels,

        "mpegversion", G_TYPE_INT, nuv->eh->i_version, NULL);

    gst_pad_use_fixed_caps (nuv->src_audio_pad);

    gst_pad_set_caps (nuv->src_audio_pad, audio_caps);

    gst_pad_set_active (nuv->src_audio_pad, TRUE);

    gst_element_add_pad (GST_ELEMENT (nuv), nuv->src_audio_pad);

    gst_caps_unref (audio_caps);

  }

  gst_element_no_more_pads (GST_ELEMENT (nuv));

}

static GstFlowReturn

gst_nuv_demux_read_head_frame (GstNuvDemux * nuv)

{

  GstFlowReturn ret = GST_FLOW_OK;

  if (nuv->fh != NULL) 

  {

    g_free (nuv->fh);

    nuv->fh = NULL;

  }

  ret = gst_nuv_demux_frame_header_load (nuv, &nuv->fh);

  if (ret != GST_FLOW_OK)

    return ret;

  nuv->state = GST_NUV_DEMUX_MOVI;

  return ret;

}

static GstFlowReturn

gst_nuv_demux_stream_data (GstNuvDemux * nuv)

{

  GstFlowReturn ret = GST_FLOW_OK;

  GstBuffer *buf = NULL;

  nuv_frame_header *h = nuv->fh;

  if (h->i_type == 'R')

    goto done;

  if (h->i_length > 0) {

	  ret = gst_nuv_demux_read_bytes (nuv, h->i_length, TRUE, &buf);

	  if (ret != GST_FLOW_OK)

		  return ret;

      if ((h->i_type == 'V') || (h->i_type == 'A')) {

        if (h->i_timecode < 0) {

            nuv->last_time = 1;

            h->i_timecode = 0;

        }

        else if (nuv->last_time == 1)

        {

          nuv->last_time = 0;

          gst_pad_push_event (nuv->src_video_pad,

              gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, 

              		GST_CLOCK_TIME_NONE, 0));

          gst_pad_push_event (nuv->src_audio_pad,

              gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, 

              		GST_CLOCK_TIME_NONE, 0));

        }

        GST_BUFFER_TIMESTAMP (buf) = h->i_timecode * GST_MSECOND;

      }    

  }

  switch (h->i_type) {

    case 'V':

    {

      if (h->i_length == 0)

        break;

      if ( !gst_pad_is_linked( nuv->src_video_pad ) )

      	break;

      GST_BUFFER_SIZE (buf) = h->i_length;

      gst_buffer_set_caps (buf, GST_PAD_CAPS (nuv->src_video_pad));

      ret = gst_pad_push (nuv->src_video_pad, buf);

      if (ret != GST_FLOW_OK) {

        GST_WARNING_OBJECT (nuv, "error pushing on srcpad %s, is linked? = %d",

            gst_pad_get_name (nuv->src_video_pad), gst_pad_is_linked (nuv->src_video_pad));

      }

      break;

    }

    case 'A':

    {

      if (h->i_length == 0)

        break;

      if ( !gst_pad_is_linked( nuv->src_audio_pad ) )

      	break;

      GST_BUFFER_SIZE (buf) = h->i_length;

      gst_buffer_set_caps (buf, GST_PAD_CAPS (nuv->src_audio_pad));

      ret = gst_pad_push (nuv->src_audio_pad, buf);

      if (ret != GST_FLOW_OK) {

        GST_WARNING_OBJECT (nuv, "Error pushing on srcpad %s, is linked? = %d",

            gst_pad_get_name (nuv->src_audio_pad), gst_pad_is_linked (nuv->src_audio_pad));

      }

      break;

    }

    case 'S':

    {

      switch (h->i_compression) {

        case 'V':

		  if ( !gst_pad_is_linked( nuv->src_video_pad ) )

		    break;

          GST_DEBUG_OBJECT (nuv, "sending new video segment: %d", h->i_timecode);

          gst_pad_push_event (nuv->src_video_pad,

              gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, h->i_timecode * GST_MSECOND, 

              		GST_CLOCK_TIME_NONE, 0));

          break;

        case 'A':        

		      if ( !gst_pad_is_linked( nuv->src_audio_pad ) )

		      	break;

          GST_DEBUG_OBJECT (nuv, "sending new audio segment: %d", h->i_timecode);

          gst_pad_push_event (nuv->src_audio_pad,

              gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, 

              		GST_CLOCK_TIME_NONE, 0));

          break;

        default:

          break;

      }

      if (buf != NULL)

        gst_buffer_unref (buf);

    }

    default:

      if (buf != NULL)

        gst_buffer_unref (buf);

      break;

  }

done:

  nuv->state = GST_NUV_DEMUX_FRAME_HEADER;

  g_free (nuv->fh);

  nuv->fh = NULL;

  return ret;

}

static GstFlowReturn

gst_nuv_demux_stream_mpeg_data (GstNuvDemux * nuv)

{

  GstFlowReturn ret = GST_FLOW_OK;

  /* ffmpeg extra data */

  ret =

      gst_nuv_demux_read_bytes (nuv, nuv->mpeg_data_size, TRUE,

      &nuv->mpeg_buffer);

  if (ret != GST_FLOW_OK) {

    return ret; 

  }

  GST_BUFFER_SIZE (nuv->mpeg_buffer) = nuv->mpeg_data_size;

  nuv->state = GST_NUV_DEMUX_EXTEND_HEADER;

  return ret;

}

static GstFlowReturn

gst_nuv_demux_stream_extra_data (GstNuvDemux * nuv)

{

  GstFlowReturn ret = GST_FLOW_OK;

  /* Load 'D' */

  nuv_frame_header *h;

  ret = gst_nuv_demux_frame_header_load (nuv, &h);

  if (ret != GST_FLOW_OK)

    return ret;

  if (h->i_type != 'D') {

    g_free (h);

    return GST_FLOW_ERROR;

  }

  if (h->i_length > 0) {

    if (h->i_compression == 'F') {

      nuv->state = GST_NUV_DEMUX_MPEG_DATA;

    } else {

      g_free (h);

      return GST_FLOW_ERROR;

    }

  } else {

    nuv->state = GST_NUV_DEMUX_EXTEND_HEADER;

  }

  g_free (h);

  h = NULL;

  return ret;

}

static GstFlowReturn

gst_nuv_demux_stream_extend_header_data (GstNuvDemux * nuv)

{

  GstFlowReturn ret = GST_FLOW_OK;

  ret = gst_nuv_demux_extended_header_load (nuv, &nuv->eh);

  if (ret != GST_FLOW_OK)

    return ret;

  gst_nuv_demux_create_pads (nuv);

  nuv->state = GST_NUV_DEMUX_FRAME_HEADER;

  return ret;

}

static GstFlowReturn

gst_nuv_demux_stream_extend_header (GstNuvDemux * nuv)

{

  GstBuffer *buf = NULL;

  GstFlowReturn res = GST_FLOW_OK;

  res = gst_nuv_demux_read_bytes (nuv, 1, FALSE, &buf);

  if (res != GST_FLOW_OK) {

    if (buf != NULL) {

      gst_buffer_unref (buf);

    }

    return res;

  }

  if (buf->data[0] == 'X') {

    gst_buffer_unref (buf);

    buf = NULL;

    nuv_frame_header *h = NULL;

    res = gst_nuv_demux_frame_header_load (nuv, &h);

    if (res != GST_FLOW_OK)

      return res;

    if (h->i_length != 512) {

      g_free (h);

      return GST_FLOW_ERROR;

    }

    g_free (h);

    h = NULL;

    nuv->state = GST_NUV_DEMUX_EXTEND_HEADER_DATA;

  } else {

    nuv->state = GST_NUV_DEMUX_INVALID_DATA;

    g_object_unref (buf);

    GST_ELEMENT_WARNING (nuv, STREAM, FAILED,

        (_("incomplete NUV support")), ("incomplete NUV support"));

    return GST_FLOW_ERROR;

  }

  return res;

}

static GstFlowReturn

gst_nuv_demux_play (GstPad * pad)

{

  GstFlowReturn res = GST_FLOW_OK;

  GstNuvDemux *nuv = GST_NUV_DEMUX (GST_PAD_PARENT (pad));

  switch (nuv->state) {

    case GST_NUV_DEMUX_START:

      res = gst_nuv_demux_stream_file_header (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_HEADER_DATA)

        break;

    case GST_NUV_DEMUX_HEADER_DATA:

      res = gst_nuv_demux_stream_header_data (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_EXTRA_DATA)

        break;

    case GST_NUV_DEMUX_EXTRA_DATA:

      res = gst_nuv_demux_stream_extra_data (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_MPEG_DATA)

        break;

    case GST_NUV_DEMUX_MPEG_DATA:

      res = gst_nuv_demux_stream_mpeg_data (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_EXTEND_HEADER)

        break;

    case GST_NUV_DEMUX_EXTEND_HEADER:

      res = gst_nuv_demux_stream_extend_header (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_EXTEND_HEADER_DATA)

        break;

    case GST_NUV_DEMUX_EXTEND_HEADER_DATA:

      res = gst_nuv_demux_stream_extend_header_data (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_FRAME_HEADER)

        break;

    case GST_NUV_DEMUX_FRAME_HEADER:

      res = gst_nuv_demux_read_head_frame (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      if (nuv->state != GST_NUV_DEMUX_MOVI)

        break;

    case GST_NUV_DEMUX_MOVI:

      res = gst_nuv_demux_stream_data (nuv);

      if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

        goto pause;

      }

      break;

    case GST_NUV_DEMUX_INVALID_DATA:

      goto pause;

      break;

    default:

      g_assert_not_reached ();

  }

  GST_DEBUG_OBJECT (nuv, "state: %d res:%s", nuv->state,

      gst_flow_get_name (res));

  return GST_FLOW_OK;

pause:

  GST_LOG_OBJECT (nuv, "pausing task, reason %s", gst_flow_get_name (res));

  gst_pad_pause_task (nuv->sinkpad);

  if (GST_FLOW_IS_FATAL (res)) {

    GST_ELEMENT_ERROR (nuv, STREAM, FAILED,

        (_("Internal data stream error.")),

        ("streaming stopped, reason %s", gst_flow_get_name (res)));

    gst_nuv_demux_send_eos (nuv);

  }

  return res;

}

static void

gst_nuv_demux_send_eos (GstNuvDemux * nuv)

{

  gst_element_post_message (GST_ELEMENT (nuv),

      gst_message_new_segment_done (GST_OBJECT (nuv), GST_FORMAT_TIME, -1));

  if (nuv->src_video_pad)

    gst_pad_push_event (nuv->src_video_pad, gst_event_new_eos ());

  if (nuv->src_audio_pad)

    gst_pad_push_event (nuv->src_audio_pad, gst_event_new_eos ());

}

static GstFlowReturn

gst_nuv_demux_read_bytes (GstNuvDemux * nuv, guint64 size, gboolean move,

    GstBuffer ** buffer)

{

  GstFlowReturn ret = GST_FLOW_OK;

  if (size == 0) {

    *buffer = gst_buffer_new ();

    return ret;

  }

  if (nuv->mode == 0) {

    ret = gst_pad_pull_range (nuv->sinkpad, nuv->offset, size, buffer);

    if (ret == GST_FLOW_OK) {

        if (move) {

		    nuv->offset += size;

		}

      /* got eos */

    } else if (ret == GST_FLOW_UNEXPECTED) {

      if (buffer != NULL)

          gst_buffer_unref (buffer);

      gst_nuv_demux_send_eos (nuv);

      return GST_FLOW_WRONG_STATE;

    }

  } else {

    if (gst_adapter_available (nuv->adapter) < size)

      return GST_FLOW_ERROR_NO_DATA;

    if (move) {

      guint8 *data = NULL;

      data = (guint8 *) gst_adapter_take (nuv->adapter, size);

      *buffer = gst_buffer_new ();

      gst_buffer_set_data (*buffer, data, size);

    } else {

      guint8 *data = NULL;

      data = (guint8 *) gst_adapter_peek (nuv->adapter, size);

      *buffer = gst_buffer_new ();

      gst_buffer_set_data (*buffer, data, size);

    }

  }

  return ret;

}

static gboolean

gst_nuv_demux_sink_activate (GstPad * sinkpad)

{

  gboolean res = TRUE;

  GstNuvDemux *nuv = GST_NUV_DEMUX (gst_pad_get_parent (sinkpad));

  if (gst_pad_check_pull_range (sinkpad)) {

    nuv->mode = 0;

    if (nuv->adapter) {

      gst_adapter_clear (nuv->adapter);

      g_object_unref (nuv->adapter);

      nuv->adapter = NULL;

    }

    res = gst_pad_activate_pull (sinkpad, TRUE);

  } else {

    nuv->mode = 1;

    if (nuv->adapter) {

      gst_adapter_clear (nuv->adapter);

    } else {

      nuv->adapter = gst_adapter_new ();

    }

    res = gst_pad_activate_push (sinkpad, TRUE);

  }

  g_object_unref (nuv);

  return res;

}

static gboolean

gst_nuv_demux_sink_activate_pull (GstPad * sinkpad, gboolean active)

{

  GstNuvDemux *nuv = GST_NUV_DEMUX (gst_pad_get_parent (sinkpad));

  if (active) {

    gst_pad_start_task (sinkpad, (GstTaskFunction) gst_nuv_demux_loop, sinkpad);

  } else {

    gst_pad_stop_task (sinkpad);

  }

  gst_object_unref (nuv);

  return TRUE;

}

static gboolean

gst_nuv_demux_sink_activate_push (GstPad * pad, gboolean active)

{

  GstNuvDemux *nuv = GST_NUV_DEMUX (gst_pad_get_parent (pad));

  if (active) {

    GST_DEBUG_OBJECT (nuv, "activating push/chain function");

  } else {

    GST_DEBUG_OBJECT (nuv, "deactivating push/chain function");

  }

  gst_object_unref (nuv);

  return TRUE;

}

static GstFlowReturn

gst_nuv_demux_chain (GstPad * pad, GstBuffer * buf)

{

  GstNuvDemux *nuv = GST_NUV_DEMUX (gst_pad_get_parent (pad));

  gst_adapter_push (nuv->adapter, buf);

  gst_object_unref (nuv);

  return gst_nuv_demux_play (pad);

}

static void

gst_nuv_demux_loop (GstPad * pad)

{

  gst_nuv_demux_play (pad);

}

static void

gst_nuv_demux_reset (GstNuvDemux * nuv)

{

  nuv->state = GST_NUV_DEMUX_START;

  nuv->mode = 0;

  nuv->offset = 0;

  nuv->last_time = 0;

  if (nuv->adapter != NULL)

    gst_adapter_clear (nuv->adapter);

  if (nuv->mpeg_buffer != NULL) {

    gst_buffer_unref (nuv->mpeg_buffer);

    nuv->mpeg_buffer = NULL;

  }

  g_free (nuv->h);

  nuv->h = NULL;

  g_free (nuv->eh);

  nuv->eh = NULL;

  g_free (nuv->fh);

  nuv->fh = NULL;

}

static void

gst_nuv_demux_destoy_src_pad (GstNuvDemux * nuv)

{

  if (nuv->src_video_pad) {

    gst_element_remove_pad (GST_ELEMENT (nuv), nuv->src_video_pad);

    nuv->src_video_pad = NULL;

  }

  if (nuv->src_audio_pad) {

    gst_element_remove_pad (GST_ELEMENT (nuv), nuv->src_audio_pad);

    nuv->src_audio_pad = NULL;

  }

}

static GstStateChangeReturn

gst_nuv_demux_change_state (GstElement * element, GstStateChange transition)

{

  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

  switch (transition) {

    case GST_STATE_CHANGE_READY_TO_PAUSED:

      break;

    default:

      break;

  }

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

  if (ret == GST_STATE_CHANGE_FAILURE)

    goto done;

  switch (transition) {

    case GST_STATE_CHANGE_PAUSED_TO_READY:

      gst_nuv_demux_destoy_src_pad (GST_NUV_DEMUX (element));

      gst_nuv_demux_reset (GST_NUV_DEMUX (element));

      break;

    default:

      break;

  }

done:

  return ret;

}

static gboolean

plugin_init (GstPlugin * plugin)

{

#ifdef ENABLE_NLS

  setlocale (LC_ALL, "");

  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);

#endif /* ENABLE_NLS */

  if (!gst_element_register (plugin, "nuvdemux", GST_RANK_SECONDARY,

          GST_TYPE_NUV_DEMUX)) {

    return FALSE;

  }

  return TRUE;

}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

    GST_VERSION_MINOR,

    "nuvdemux",

    "Demuxes and muxes audio and video",

    plugin_init, VERSION, "LGPL", "NuvDemux", "")