lencod.c

H.264视频编码器(ITU的264编码参考软件)

    img->offset_for_non_ref_pic  =  0;
    img->offset_for_ref_frame[0] =   2;
  }
  else
  {
    img->offset_for_non_ref_pic  =  -2*(input->successive_Bframe);
    img->offset_for_ref_frame[0] =   2*(input->successive_Bframe+1);
  }

  if ((input->PicInterlace==FRAME_CODING)&&(input->MbInterlace==FRAME_CODING))
    img->offset_for_top_to_bottom_field=0;
  else    
    img->offset_for_top_to_bottom_field=1;

  if ((input->PicInterlace==FRAME_CODING)&&(input->MbInterlace==FRAME_CODING))
  {
    img->pic_order_present_flag=0;
    img->delta_pic_order_cnt_bottom = 0;
  }
  else    
  {
    img->pic_order_present_flag=1;
    img->delta_pic_order_cnt_bottom = 1;
  }
}


/*!
 ***********************************************************************
 * \brief
 *    Initializes the img->nz_coeff
 * \par Input:
 *    none
 * \par  Output:
 *    none
 * \ side effects
 *    sets omg->nz_coef[][][][] to -1
 ***********************************************************************
 */
void CAVLC_init()
{
  unsigned int i, k, l;

  for (i=0;i < img->PicSizeInMbs; i++)
    for (k=0;k<4;k++)
      for (l=0;l < (4 + (unsigned int)img->num_blk8x8_uv);l++)
        img->nz_coeff[i][k][l]=0;


}


/*!
 ***********************************************************************
 * \brief
 *    Initializes the Image structure with appropriate parameters.
 * \par Input:
 *    Input Parameters struct inp_par *inp
 * \par  Output:
 *    Image Parameters struct img_par *img
 ***********************************************************************
 */
void init_img()
{
  int i,j;
  int byte_abs_range;

  static int mb_width_cr[4] = {0,8, 8,16};
  static int mb_height_cr[4]= {0,8,16,16};

  img->yuv_format = input->yuv_format;

  //pel bitdepth init
  img->bitdepth_luma   = input->BitDepthLuma;
  
  if((img->bitdepth_luma > img->bitdepth_chroma) || img->yuv_format == YUV400)
    img->pic_unit_size_on_disk = (img->bitdepth_luma > 8)? 16:8;
  else
    img->pic_unit_size_on_disk = (img->bitdepth_chroma > 8)? 16:8;

  img->bitdepth_luma_qp_scale   = 6*(img->bitdepth_luma   - 8);
  img->bitdepth_lambda_scale    = 2*(img->bitdepth_luma   - 8);

  img->dc_pred_value = 1<<(img->bitdepth_luma - 1);
  img->max_imgpel_value = (1<<img->bitdepth_luma) - 1;

  if (img->yuv_format != YUV400)  
  {
    img->bitdepth_chroma     = input->BitDepthChroma;
    img->max_imgpel_value_uv = (1<<img->bitdepth_chroma) - 1;
    img->num_blk8x8_uv       = (1<<img->yuv_format)&(~(0x1));
    img->num_cdc_coeff       = img->num_blk8x8_uv<<1;
    img->mb_cr_size_x        = (img->yuv_format==YUV420 || img->yuv_format==YUV422)? 8:16;
    img->mb_cr_size_y        = (img->yuv_format==YUV444 || img->yuv_format==YUV422)? 16:8;

    img->bitdepth_chroma_qp_scale = 6*(img->bitdepth_chroma - 8);
    if(img->residue_transform_flag)
      img->bitdepth_chroma_qp_scale += 6;

    img->chroma_qp_offset[0] = active_pps->cb_qp_index_offset;
    img->chroma_qp_offset[1] = active_pps->cr_qp_index_offset;
  }
  else
  {
    img->bitdepth_chroma     = 0;
    img->max_imgpel_value_uv = 0;
    img->num_blk8x8_uv       = 0;
    img->num_cdc_coeff       = 0;
    img->mb_cr_size_x        = 0;
    img->mb_cr_size_y        = 0;
    
    img->bitdepth_chroma_qp_scale = 0;
    img->bitdepth_chroma_qp_scale = 0;
    
    img->chroma_qp_offset[0] = 0;
    img->chroma_qp_offset[1] = 0;
  }

  img->num_ref_frames = active_sps->num_ref_frames;
  img->max_num_references   = active_sps->frame_mbs_only_flag ? active_sps->num_ref_frames : 2 * active_sps->num_ref_frames;


  img->buf_cycle = input->num_ref_frames;

  img->DeblockCall = 0;

//  img->framerate=INIT_FRAME_RATE;   // The basic frame rate (of the original sequence)
  img->framerate=(float) input->FrameRate;   // The basic frame rate (of the original sequence)


  get_mem_mv (&(img->pred_mv));
  get_mem_mv (&(img->all_mv));

  get_mem_ACcoeff (&(img->cofAC));
  get_mem_DCcoeff (&(img->cofDC));

  
  if(input->MbInterlace)
  {
    get_mem_mv (&(rddata_top_frame_mb.pred_mv));
    get_mem_mv (&(rddata_top_frame_mb.all_mv));

    get_mem_mv (&(rddata_bot_frame_mb.pred_mv));
    get_mem_mv (&(rddata_bot_frame_mb.all_mv));

    get_mem_mv (&(rddata_top_field_mb.pred_mv));
    get_mem_mv (&(rddata_top_field_mb.all_mv));

    get_mem_mv (&(rddata_bot_field_mb.pred_mv));
    get_mem_mv (&(rddata_bot_field_mb.all_mv));

    get_mem_ACcoeff (&(rddata_top_frame_mb.cofAC));
    get_mem_DCcoeff (&(rddata_top_frame_mb.cofDC));

    get_mem_ACcoeff (&(rddata_bot_frame_mb.cofAC));
    get_mem_DCcoeff (&(rddata_bot_frame_mb.cofDC));

    get_mem_ACcoeff (&(rddata_top_field_mb.cofAC));
    get_mem_DCcoeff (&(rddata_top_field_mb.cofDC));

    get_mem_ACcoeff (&(rddata_bot_field_mb.cofAC));
    get_mem_DCcoeff (&(rddata_bot_field_mb.cofDC));
  }

  if(img->max_imgpel_value > img->max_imgpel_value_uv)
    byte_abs_range = (img->max_imgpel_value + 1) * 2;
  else
    byte_abs_range = (img->max_imgpel_value_uv + 1) * 2;

  if ((img->quad = (int*)calloc (byte_abs_range, sizeof(int))) == NULL)
    no_mem_exit ("init_img: img->quad");
  img->quad+=byte_abs_range/2;
  for (i=0; i < byte_abs_range/2; ++i)
  {
    img->quad[i]=img->quad[-i]=i*i;
  }

  img->width    = input->img_width;
  img->height   = input->img_height;
  if (img->yuv_format != YUV400)
  {
    img->width_cr = input->img_width/(16/mb_width_cr[img->yuv_format]);
    img->height_cr= input->img_height_cr = input->img_height/(16/mb_height_cr[img->yuv_format]);
  }
  else
  {
    img->width_cr = 0;
    img->height_cr= 0;
  }
  
  img->PicWidthInMbs    = input->img_width/MB_BLOCK_SIZE;
  img->FrameHeightInMbs = input->img_height/MB_BLOCK_SIZE;
  img->FrameSizeInMbs   = img->PicWidthInMbs * img->FrameHeightInMbs;

  img->PicHeightInMapUnits = ( active_sps->frame_mbs_only_flag ? img->FrameHeightInMbs : img->FrameHeightInMbs/2 );

  if(((img->mb_data) = (Macroblock *) calloc(img->FrameSizeInMbs,sizeof(Macroblock))) == NULL)
    no_mem_exit("init_img: img->mb_data");

  if(input->UseConstrainedIntraPred)
  {
    if(((img->intra_block) = (int*)calloc(img->FrameSizeInMbs,sizeof(int))) == NULL)
      no_mem_exit("init_img: img->intra_block");
  }

  get_mem2Dint(&(img->ipredmode), img->width/BLOCK_SIZE, img->height/BLOCK_SIZE);        //need two extra rows at right and bottom
  get_mem2Dint(&(img->ipredmode8x8), img->width/BLOCK_SIZE, img->height/BLOCK_SIZE);     // help storage for ipredmode 8x8, inserted by YV
 
  get_mem2Dint(&(rddata_top_frame_mb.ipredmode), img->width/BLOCK_SIZE, img->height/BLOCK_SIZE);
  
  if(input->MbInterlace) 
  {
    get_mem2Dint(&(rddata_bot_frame_mb.ipredmode), img->width/BLOCK_SIZE, img->height/BLOCK_SIZE);
    get_mem2Dint(&(rddata_top_field_mb.ipredmode), img->width/BLOCK_SIZE, img->height/BLOCK_SIZE);
    get_mem2Dint(&(rddata_bot_field_mb.ipredmode), img->width/BLOCK_SIZE, img->height/BLOCK_SIZE);
  }
  // CAVLC mem
  get_mem3Dint(&(img->nz_coeff), img->FrameSizeInMbs, 4, 4+img->num_blk8x8_uv);

  CAVLC_init();

  for (i=0; i < img->width/BLOCK_SIZE; i++)
    for (j=0; j < img->height/BLOCK_SIZE; j++)
    {
      img->ipredmode[i][j]=-1;
      img->ipredmode8x8[i][j]=-1;
    }

  img->mb_y_upd=0;

  RandomIntraInit (img->width/16, img->height/16, input->RandomIntraMBRefresh);

  InitSEIMessages();  // Tian Dong (Sept 2002)

  // Initialize filtering parameters. If sending parameters, the offsets are 
  // multiplied by 2 since inputs are taken in "div 2" format.
  // If not sending paramters, all fields are cleared 
  if (input->LFSendParameters)
  {
    input->LFAlphaC0Offset <<= 1;
    input->LFBetaOffset <<= 1;
  }
  else
  {
    input->LFDisableIdc = 0;
    input->LFAlphaC0Offset = 0;
    input->LFBetaOffset = 0;
  }
}

/*!
 ***********************************************************************
 * \brief
 *    Free the Image structures
 * \par Input:
 *    Image Parameters struct img_par *img
 ***********************************************************************
 */
void free_img ()
{
  CloseSEIMessages(); // Tian Dong (Sept 2002)
  free_mem_mv (img->pred_mv);
  free_mem_mv (img->all_mv);

  free_mem_ACcoeff (img->cofAC);
  free_mem_DCcoeff (img->cofDC);

  if(input->MbInterlace)
  {
    free_mem_mv (rddata_top_frame_mb.pred_mv);
    free_mem_mv (rddata_top_frame_mb.all_mv);

    free_mem_mv (rddata_bot_frame_mb.pred_mv);
    free_mem_mv (rddata_bot_frame_mb.all_mv);

    free_mem_mv (rddata_top_field_mb.pred_mv);
    free_mem_mv (rddata_top_field_mb.all_mv);

    free_mem_mv (rddata_bot_field_mb.pred_mv);
    free_mem_mv (rddata_bot_field_mb.all_mv);

    free_mem_ACcoeff (rddata_top_frame_mb.cofAC);
    free_mem_DCcoeff (rddata_top_frame_mb.cofDC);

    free_mem_ACcoeff (rddata_bot_frame_mb.cofAC);
    free_mem_DCcoeff (rddata_bot_frame_mb.cofDC);

    free_mem_ACcoeff (rddata_top_field_mb.cofAC);
    free_mem_DCcoeff (rddata_top_field_mb.cofDC);

    free_mem_ACcoeff (rddata_bot_field_mb.cofAC);
    free_mem_DCcoeff (rddata_bot_field_mb.cofDC);
  }

  if(img->max_imgpel_value > img->max_imgpel_value_uv)
    free (img->quad-(img->max_imgpel_value + 1));
  else
    free (img->quad-(img->max_imgpel_value_uv + 1));

  if(input->MbInterlace) 
  {
    free_mem2Dint(rddata_bot_frame_mb.ipredmode);
    free_mem2Dint(rddata_top_field_mb.ipredmode);
    free_mem2Dint(rddata_bot_field_mb.ipredmode);
  }

}



/*!
 ************************************************************************
 * \brief
 *    Allocates the picture structure along with its dependent
 *    data structures
 * \return
 *    Pointer to a Picture
 ************************************************************************
 */

Picture *malloc_picture()
{
  Picture *pic;