sei.cpp

h264编解码.用C++实现了图像的编解码功能。

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void interpret_subsequence_info( byte* payload, int size, ImageParameters *img )
{
  Bitstream* buf;
  int sub_seq_layer_num, sub_seq_id, first_ref_pic_flag, leading_non_ref_pic_flag, last_pic_flag, 
      sub_seq_frame_num_flag, sub_seq_frame_num;

  buf =(Bitstream *) malloc(sizeof(Bitstream));
  buf->bitstream_length = size;
  buf->streamBuffer = payload;
  buf->frame_bitoffset = 0;

  UsedBits = 0;

  sub_seq_layer_num        = ue_v("SEI: sub_seq_layer_num"       , buf);
  sub_seq_id               = ue_v("SEI: sub_seq_id"              , buf);
  first_ref_pic_flag       = u_1 ("SEI: first_ref_pic_flag"      , buf);
  leading_non_ref_pic_flag = u_1 ("SEI: leading_non_ref_pic_flag", buf);
  last_pic_flag            = u_1 ("SEI: last_pic_flag"           , buf);
  sub_seq_frame_num_flag   = u_1 ("SEI: sub_seq_frame_num_flag"  , buf);
  if (sub_seq_frame_num_flag)
  {
    sub_seq_frame_num        = ue_v("SEI: sub_seq_frame_num"       , buf);
  }

  free(buf);
}

/*!
 ************************************************************************
 *  \brief
 *     Interpret the Sub-sequence layer characteristics SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_subsequence_layer_characteristics_info( byte* payload, int size, ImageParameters *img )
{
  Bitstream* buf;
  long num_sub_layers, accurate_statistics_flag, average_bit_rate, average_frame_rate;
  int i;

  buf =(Bitstream *) malloc(sizeof(Bitstream));
  buf->bitstream_length = size;
  buf->streamBuffer = payload;
  buf->frame_bitoffset = 0;

  UsedBits = 0;

  num_sub_layers = 1 + ue_v("SEI: num_sub_layers_minus1", buf);

  for (i=0; i<num_sub_layers; i++)
  {
    accurate_statistics_flag = u_1(   "SEI: accurate_statistics_flag", buf);
    average_bit_rate         = u_v(16,"SEI: average_bit_rate"        , buf);
    average_frame_rate       = u_v(16,"SEI: average_frame_rate"      , buf);
  }
  free (buf);
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the Sub-sequence characteristics SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_subsequence_characteristics_info( byte* payload, int size, ImageParameters *img )
{
  Bitstream* buf;
  int i;
  int sub_seq_layer_num, sub_seq_id, duration_flag, average_rate_flag, accurate_statistics_flag;
  unsigned long sub_seq_duration, average_bit_rate, average_frame_rate;
  int num_referenced_subseqs, ref_sub_seq_layer_num, ref_sub_seq_id, ref_sub_seq_direction;

  buf =(Bitstream *) malloc(sizeof(Bitstream));
  buf->bitstream_length = size;
  buf->streamBuffer = payload;
  buf->frame_bitoffset = 0;

  UsedBits = 0;

  sub_seq_layer_num = ue_v("SEI: sub_seq_layer_num", buf);
  sub_seq_id        = ue_v("SEI: sub_seq_id", buf);
  duration_flag     = u_1 ("SEI: duration_flag", buf);
  if ( duration_flag )
  {
    sub_seq_duration = u_v (32, "SEI: duration_flag", buf);
  }

  average_rate_flag = u_1 ("SEI: average_rate_flag", buf);

  if ( average_rate_flag )
  {
    accurate_statistics_flag = u_1 (    "SEI: accurate_statistics_flag", buf);
    average_bit_rate         = u_v (16, "SEI: average_bit_rate", buf);
    average_frame_rate       = u_v (16, "SEI: average_frame_rate", buf);
  }

  num_referenced_subseqs  = ue_v("SEI: num_referenced_subseqs", buf);

  for (i=0; i<num_referenced_subseqs; i++)
  {
    ref_sub_seq_layer_num  = ue_v("SEI: ref_sub_seq_layer_num", buf);
    ref_sub_seq_id         = ue_v("SEI: ref_sub_seq_id", buf);
    ref_sub_seq_direction  = u_1 ("SEI: ref_sub_seq_direction", buf);
  }

  free( buf );
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the Scene information SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_scene_information( byte* payload, int size, ImageParameters *img )
{
  Bitstream* buf;
  int scene_id, scene_transition_type, second_scene_id;

  buf =(Bitstream *) malloc(sizeof(Bitstream));
  buf->bitstream_length = size;
  buf->streamBuffer = payload;
  buf->frame_bitoffset = 0;

  UsedBits = 0;

  scene_id              = ue_v("SEI: scene_id"             , buf);
  scene_transition_type = ue_v("SEI: scene_transition_type", buf);
  if ( scene_transition_type > 3 )
  {
    second_scene_id     = ue_v("SEI: scene_transition_type", buf);;
  }
  free( buf );
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the Filler payload SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_filler_payload_info( byte* payload, int size, ImageParameters *img )
{
  int  offset = 0;
  byte payload_cnt = 0;

  while (offset<size)
  {
    if (payload[offset] == 0xFF)
    {
       payload_cnt++;
    }
  }
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the User data unregistered SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_user_data_unregistered_info( byte* payload, int size, ImageParameters *img )
{
  int offset = 0;
  byte payload_byte;

  assert (size<16);

  while (offset < size)
  {
    payload_byte = payload[offset];
    offset ++;
  }
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the User data registered by ITU-T T.35 SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_user_data_registered_itu_t_t35_info( byte* payload, int size, ImageParameters *img )
{
  int offset = 0;
  byte itu_t_t35_country_code, itu_t_t35_country_code_extension_byte, payload_byte;

  itu_t_t35_country_code = payload[offset];
  offset++;
  if(itu_t_t35_country_code == 0xFF) 
  {
    itu_t_t35_country_code_extension_byte = payload[offset];
    offset++;
  }
  while (offset < size)
  {
    payload_byte = payload[offset];
    offset ++;
  }
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the Pan scan rectangle SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_pan_scan_rect_info( byte* payload, int size, ImageParameters *img )
{
  int pan_scan_rect_id, pan_scan_rect_left_offset, pan_scan_rect_right_offset;
  int pan_scan_rect_top_offset, pan_scan_rect_bottom_offset;

  Bitstream* buf;

  buf =(Bitstream *) malloc(sizeof(Bitstream));
  buf->bitstream_length = size;
  buf->streamBuffer = payload;
  buf->frame_bitoffset = 0;

  UsedBits = 0;

  pan_scan_rect_id = ue_v("SEI: pan_scan_rect_id", buf);

  pan_scan_rect_left_offset   = se_v("SEI: pan_scan_rect_left_offset"  , buf);
  pan_scan_rect_right_offset  = se_v("SEI: pan_scan_rect_right_offset" , buf);
  pan_scan_rect_top_offset    = se_v("SEI: pan_scan_rect_top_offset"   , buf);
  pan_scan_rect_bottom_offset = se_v("SEI: pan_scan_rect_bottom_offset", buf);

  free (buf);
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the Random access point SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_random_access_info( byte* payload, int size, ImageParameters *img )
{
  int recovery_frame_cnt, exact_match_flag, broken_link_flag, changing_slice_group_idc;


  Bitstream* buf;


  buf =(Bitstream *) malloc(sizeof(Bitstream));
  buf->bitstream_length = size;
  buf->streamBuffer = payload;
  buf->frame_bitoffset = 0;

  UsedBits = 0;

  recovery_frame_cnt       = ue_v(    "SEI: recovery_frame_cnt"      , buf);
  exact_match_flag         = u_1 (    "SEI: exact_match_flag"        , buf);
  broken_link_flag         = u_1 (    "SEI: broken_link_flag"        , buf);
  changing_slice_group_idc = u_v ( 2, "SEI: changing_slice_group_idc", buf);

  free (buf);
}


/*!
 ************************************************************************
 *  \brief
 *     Interpret the Decoded Picture Buffer Management Repetition SEI message
 *  \param payload
 *     a pointer that point to the sei payload
 *  \param size
 *     the size of the sei message
 *  \param img
 *     the image pointer
 *    
 ************************************************************************
 */
void interpret_dec_ref_pic_marking_repetition_info( byte* payload, int size, ImageParameters *img )
{
  int original_idr_flag, original_frame_num;

  DecRefPicMarking_t *tmp_drpm;

  DecRefPicMarking_t *old_drpm;
  int old_idr_flag , old_no_output_of_prior_pics_flag, old_long_term_reference_flag , old_adaptive_ref_pic_buffering_flag;