image.c

在ccs下运行的代码。通过编译 可以运行

/*!
 ***********************************************************************
 * \file image.c
 *
 * \brief
 *    Decode a Slice

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

//#include "contributors.h"

#include <math.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
/*
#ifdef WIN32
#include <io.h>
#else
#include <unistd.h>
#endif
*/
#include "global.h"
#include "errorconcealment.h"
#include "image.h"
#include "mbuffer.h"
#include "fmo.h"
#include "nalu.h"
#include "parsetcommon.h"
#include "parset.h"
#include "header.h"
//#include "rtp.h"
//#include "sei.h"
#include "output.h"
//#include "biaridecod.h"
#include "mb_access.h"
#include "memalloc.h"
#include "annexb.h"

//#include "context_ini.h"
//#include "cabac.h"
#include "loopfilter.h"

#include "vlc.h"

#include "erc_api.h"
extern objectBuffer_t *erc_object_list;
extern ercVariables_t *erc_errorVar;
extern frame erc_recfr;
extern int erc_mvperMB;
extern struct img_par *erc_img;

extern FILE *p_out2;

extern StorablePicture **listX[6];
extern ColocatedParams *Co_located;

StorablePicture *dec_picture;

OldSliceParams old_slice;

void MbAffPostProc()
{
  imgpel temp[16][32];

  imgpel ** imgY  = dec_picture->imgY;
  imgpel ***imgUV = dec_picture->imgUV;

  int i, x, y, x0, y0, uv;
  for (i=0; i<(int)dec_picture->PicSizeInMbs; i+=2)
  {
    if (dec_picture->mb_field[i])
    {
      get_mb_pos(i, &x0, &y0);
      for (y=0; y<(2*MB_BLOCK_SIZE);y++)
        for (x=0; x<MB_BLOCK_SIZE; x++)
          temp[x][y] = imgY[y0+y][x0+x];

      for (y=0; y<MB_BLOCK_SIZE;y++)
        for (x=0; x<MB_BLOCK_SIZE; x++)
        {
          imgY[y0+(2*y)][x0+x]   = temp[x][y];
          imgY[y0+(2*y+1)][x0+x] = temp[x][y+MB_BLOCK_SIZE];
        }

      if (dec_picture->chroma_format_idc != YUV400)
      {
        x0 = x0 / (16/img->mb_cr_size_x);
        y0 = y0 / (16/img->mb_cr_size_y);

        for (uv=0; uv<2; uv++)
        {
          for (y=0; y<(2*img->mb_cr_size_y);y++)
            for (x=0; x<img->mb_cr_size_x; x++)
              temp[x][y] = imgUV[uv][y0+y][x0+x];
          
          for (y=0; y<img->mb_cr_size_y;y++)
            for (x=0; x<img->mb_cr_size_x; x++)
            {
              imgUV[uv][y0+(2*y)][x0+x]   = temp[x][y];
              imgUV[uv][y0+(2*y+1)][x0+x] = temp[x][y+img->mb_cr_size_y];
            }
        }
      }
    }
  }
}

/*!
 ***********************************************************************
 * \brief
 *    decodes one I- or P-frame
 *
 ***********************************************************************
 */

int decode_one_frame(struct img_par *img,struct inp_par *inp)// struct snr_par *snr)
{
  int current_header;
  Slice *currSlice = img->currentSlice;//定义slice指向img中的slice   zsj1205006

  img->current_slice_nr = 0;//当前slice号为0
  img->current_mb_nr = -4711;  //宏块号zsj1205006   // initialized to an impossible value for debugging -- correct value is taken from slice header
  currSlice->next_header = -8888; //当前slice的下一个头// initialized to an impossible value for debugging -- correct value is taken from slice header
  img->num_dec_mb = 0;//解码图像的宏块数
  img->newframe = 1;

  while ((currSlice->next_header != EOS && currSlice->next_header != SOP))
  	//当前slice 的下一个头不是EOS 并且不是EOP则解码
  //解码码流在整个循环里面 zsj1305006
  {
    current_header = read_new_slice();//读新的slice头  返回的是EOS  or SOP   SOS    zsj1305006

    if (current_header == EOS)//当前头为EOS则退出
    {
      exit_picture();
      return EOS;
    }

    decode_slice(img, inp, current_header);//解码slice  zsj1305006  输入为inp 及current_header  解码出来的图像存放到img里

    img->newframe = 0;//变为0
    img->current_slice_nr++;//slice数目加1
  }

  exit_picture();// *    finish decoding of a picture, conceal errors and store it 
// *    into the DPB

  return (SOP);
}


/*!
 ************************************************************************
 * \brief
 *    Convert file read buffer to source picture structure
 * \param imgX
 *    Pointer to image plane
 * \param buf
 *    Buffer for file output
 * \param size_x
 *    horizontal image size in pixel
 * \param size_y
 *    vertical image size in pixel
 * \param symbol_size_in_bytes
 *    number of bytes used per pel
 ************************************************************************
 */
 /*
void buf2img (imgpel** imgX, unsigned char* buf, int size_x, int size_y, int symbol_size_in_bytes)
{
  int i,j;

  unsigned short tmp16, ui16;
  unsigned long  tmp32, ui32;

  if (symbol_size_in_bytes> sizeof(imgpel))
  {
    error ("Source picture has higher bit depth than imgpel data type. Please recompile with larger data type for imgpel.", 500);
  }

  if (( sizeof(char) == sizeof (imgpel)) && ( sizeof(char) == symbol_size_in_bytes))
  {
    // imgpel == pixel_in_file == 1 byte -> simple copy
    for(j=0;j<size_y;j++)
      memcpy(imgX[j], buf+j*size_x, size_x);
  }
  else
  {
    // sizeof (imgpel) > sizeof(char)
    if (testEndian())
    {
      // big endian
      switch (symbol_size_in_bytes)
      {
      case 1:
        {
          for(j=0;j<size_y;j++)
            for(i=0;i<size_x;i++)
            {
              imgX[j][i]= buf[i+j*size_x];
            }
          break;
        }
      case 2:
        {
          for(j=0;j<size_y;j++)
            for(i=0;i<size_x;i++)
            {
              memcpy(&tmp16, buf+((i+j*size_x)*2), 2);
              ui16  = (tmp16 >> 8) | ((tmp16&0xFF)<<8);
              imgX[j][i] = (imgpel) ui16;
            }
          break;
        }
      case 4:
        {
          for(j=0;j<size_y;j++)
            for(i=0;i<size_x;i++)
            {
              memcpy(&tmp32, buf+((i+j*size_x)*4), 4);
              ui32  = ((tmp32&0xFF00)<<8) | ((tmp32&0xFF)<<24) | ((tmp32&0xFF0000)>>8) | ((tmp32&0xFF000000)>>24);
              imgX[j][i] = (imgpel) ui32;
            }
        }
      default:
        {
           error ("reading only from formats of 8, 16 or 32 bit allowed on big endian architecture", 500);
           break;
        }
      }

    }
    else
    {
      // little endian
      for (j=0; j < size_y; j++)
        for (i=0; i < size_x; i++)
        {
          imgX[j][i]=0;
          memcpy(&(imgX[j][i]), buf +((i+j*size_x)*symbol_size_in_bytes), symbol_size_in_bytes);
        }

    }
  }
}
*/

/*!
************************************************************************
* \brief
*    Find PSNR for all three components.Compare decoded frame with
*    the original sequence. Read inp->jumpd frames to reflect frame skipping.
************************************************************************
*/
/*
void find_snr(
              struct snr_par  *snr,   //!< pointer to snr parameters
              StorablePicture *p,     //!< picture to be compared
              int p_ref)              //!< open reference YUV file
{
  int SubWidthC  [4]= { 1, 2, 2, 1};
  int SubHeightC [4]= { 1, 2, 1, 1};
  int crop_left, crop_right, crop_top, crop_bottom;

  int i,j;
  int64 diff_y,diff_u,diff_v;
  int uv;
  int64  status;
  int symbol_size_in_bytes = img->pic_unit_bitsize_on_disk/8;
  int size_x, size_y;
  int size_x_cr, size_y_cr;
  int64 framesize_in_bytes;
  unsigned int max_pix_value_sqd = img->max_imgpel_value * img->max_imgpel_value;
  unsigned int max_pix_value_sqd_uv = img->max_imgpel_value_uv * img->max_imgpel_value_uv;
  Boolean rgb_output = (active_sps->vui_seq_parameters.matrix_coefficients==0);
  unsigned char *buf;

  // calculate frame number
  int  psnrPOC = active_sps->mb_adaptive_frame_field_flag ? p->poc /(input->poc_scale) : p->poc/(3-input->poc_scale);

  // cropping for luma
  if (p->frame_cropping_flag)
  {
    crop_left   = SubWidthC[p->chroma_format_idc] * p->frame_cropping_rect_left_offset;
    crop_right  = SubWidthC[p->chroma_format_idc] * p->frame_cropping_rect_right_offset;
    crop_top    = SubHeightC[p->chroma_format_idc]*( 2 - p->frame_mbs_only_flag ) *  p->frame_cropping_rect_top_offset;
    crop_bottom = SubHeightC[p->chroma_format_idc]*( 2 - p->frame_mbs_only_flag ) *   p->frame_cropping_rect_bottom_offset;
  }
  else
  {
    crop_left = crop_right = crop_top = crop_bottom = 0;
  }

  size_x = p->size_x - crop_left - crop_right;
  size_y = p->size_y - crop_top - crop_bottom;

  // cropping for chroma
  if (p->frame_cropping_flag)
  {
    crop_left   = p->frame_cropping_rect_left_offset;
    crop_right  = p->frame_cropping_rect_right_offset;
    crop_top    = ( 2 - p->frame_mbs_only_flag ) *  p->frame_cropping_rect_top_offset;
    crop_bottom = ( 2 - p->frame_mbs_only_flag ) *   p->frame_cropping_rect_bottom_offset;
  }
  else
  {
    crop_left = crop_right = crop_top = crop_bottom = 0;
  }

  if ((p->chroma_format_idc==YUV400) && input->write_uv)
  {
    size_x_cr = p->size_x/2;
    size_y_cr = p->size_y/2;
  }
  else
  {
    size_x_cr = p->size_x_cr - crop_left - crop_right;
    size_y_cr = p->size_y_cr - crop_top  - crop_bottom;
  }

  framesize_in_bytes = (((int64)size_y*size_x) + ((int64)size_y_cr*size_x_cr)*2) * symbol_size_in_bytes;

  if (psnrPOC==0 && img->psnr_number)
    img->idr_psnr_number=img->psnr_number + 1;

  img->psnr_number=max(img->psnr_number,img->idr_psnr_number+psnrPOC);

  frame_no = img->idr_psnr_number+psnrPOC;

  // KS: this buffer should actually be allocated only once, but this is still much faster than the previous version
  buf = malloc ( size_y * size_x * symbol_size_in_bytes );

  if (NULL == buf)
  {
    no_mem_exit("find_snr: buf");
  }

  status = lseek (p_ref, framesize_in_bytes * frame_no, SEEK_SET);
  if (status == -1)
  {
    fprintf(stderr, "Error in seeking frame number: %d\n", frame_no);
    free (buf);
    return;
  }

  if(rgb_output)
    lseek (p_ref, framesize_in_bytes/3, SEEK_CUR);

  read(p_ref, buf, size_y * size_x * symbol_size_in_bytes);
  buf2img(imgY_ref, buf, size_x, size_y, symbol_size_in_bytes);

  if (p->chroma_format_idc != YUV400)
  {
    for (uv=0; uv < 2; uv++)
    {
      if(rgb_output && uv==1)
        lseek (p_ref, -framesize_in_bytes, SEEK_CUR);
    
      read(p_ref, buf, size_y_cr * size_x_cr*symbol_size_in_bytes);
      buf2img(imgUV_ref[uv], buf, size_x_cr, size_y_cr, symbol_size_in_bytes);
    }