explicit_gop.c

h.264官方测试软件

/*!
 *************************************************************************************
 * \file explicit_gop.c
 *
 * \brief
 *    Code for explicit gop support and pyramidal coding.
 *
 * \author
 *    Main contributors (see contributors.h for copyright, address and affiliation details)
 *     - Alexis Michael Tourapis                     <[e-mail]> 
 *************************************************************************************
 */

#include <stdlib.h>
#include <ctype.h>
#include <limits.h>
#include "global.h"
#include "contributors.h"
#include "explicit_gop.h"
#include "image.h"
#include "nalucommon.h"
#include "string.h"


/*!
************************************************************************
* \brief
*    Generation of Pyramid GOP
************************************************************************
*/
void create_pyramid()
{
  int i, j;
  int centerB=input->successive_Bframe/2;
  GOP_DATA tmp;

  if (input->PyramidCoding == 1)
  {
    for (i=0;i<input->successive_Bframe;i++)
    {
      if (i < centerB)
      {
        gop_structure[i].slice_type = B_SLICE;
        gop_structure[i].display_no = i * 2 + 1;
        gop_structure[i].pyramid_layer = 0;
        gop_structure[i].reference_idc = NALU_PRIORITY_HIGH;
        gop_structure[i].slice_qp = max(0, (input->qpB + (input->PyramidLevelQPEnable ? -1: input->qpBRSOffset)));

      }
      else
      {
        gop_structure[i].slice_type = B_SLICE;
        gop_structure[i].display_no = (i - centerB) * 2;
        gop_structure[i].pyramid_layer = 1;
        gop_structure[i].reference_idc = NALU_PRIORITY_DISPOSABLE;
        gop_structure[i].slice_qp = input->qpB;
      }      
    }
  }
  else
  {    
    int GOPlevels = 1;
    int Bframes = input->successive_Bframe;
    int *curGOPLevelfrm,*curGOPLeveldist ;
    int curlevel = GOPlevels ;
    int i;

    while (((Bframes + 1 ) >> GOPlevels) > 1)
    {
      GOPlevels ++;
    }
     
    curlevel = GOPlevels ;

    if (NULL == (curGOPLevelfrm = (int*)malloc(GOPlevels * sizeof(int)))) no_mem_exit("create_pyramid:curGOPLevelfrm");
    if (NULL == (curGOPLeveldist= (int*)malloc(GOPlevels * sizeof(int)))) no_mem_exit("create_pyramid:curGOPLeveldist");
    
    for (i=0; i <input->successive_Bframe; i++)
    {
      gop_structure[i].display_no = i;
      gop_structure[i].slice_type = B_SLICE;
      gop_structure[i].pyramid_layer = 0;
      gop_structure[i].reference_idc = NALU_PRIORITY_DISPOSABLE;
      gop_structure[i].slice_qp = input->qpB;
    }

    for (j = 1; j < GOPlevels; j++) 
    {
      for (i = (1 << j) - 1; i < Bframes + 1 - (1 << j); i += (1 << j)) {
        gop_structure[i].pyramid_layer  = j;
        gop_structure[i].reference_idc  = NALU_PRIORITY_HIGH;
        gop_structure[i].slice_qp = max(0, input->qpB + (input->PyramidLevelQPEnable ? -j: input->qpBRSOffset));
      }     
   }

    for (i = 1; i < Bframes; i++) 
{
      j = i;
  
      while (j > 0 && gop_structure[j].pyramid_layer > gop_structure[j-1].pyramid_layer) 
  {
        tmp = gop_structure[j-1];
        gop_structure[j-1] = gop_structure[j];
        gop_structure[j] = tmp;
        j--;
    }
  }
  }  
}


/*!
************************************************************************
* \brief
*    Initialization of GOP structure.
*
************************************************************************
*/
void init_gop_structure()
{
  int max_gopsize = input->PyramidCoding != 3 ? input->successive_Bframe  : input->jumpd;
  
  gop_structure = calloc(max(10,max_gopsize), sizeof (GOP_DATA)); // +1 for reordering
  if (NULL==gop_structure) 
    no_mem_exit("init_gop_structure: gop_structure");
}


/*!
************************************************************************
* \brief
*    Clear GOP structure
************************************************************************
*/
void clear_gop_structure()
{
  if (gop_structure)
    free(gop_structure);
}


/*!
************************************************************************
* \brief
*    Interpret GOP struct from input parameters
************************************************************************
*/
void interpret_gop_structure()
{

  int nLength = strlen(input->ExplicitPyramidFormat);
  int i =0, k, dqp, display_no;
  int slice_read =0, order_read = 0, stored_read = 0, qp_read =0;
  int coded_frame = 0;
  
  if (nLength > 0)
  {
    
    for (i = 0; i < nLength ; i++)
    {    
      //! First lets read slice type
      if (slice_read == 0)
      {
        switch (input->ExplicitPyramidFormat[i])
        {
        case 'P':
        case 'p':
          gop_structure[coded_frame].slice_type=P_SLICE;
          break;
        case 'B':
        case 'b':
          gop_structure[coded_frame].slice_type=B_SLICE;
          break;
        case 'I':
        case 'i':
          gop_structure[coded_frame].slice_type=I_SLICE;
          break;
        default:
          snprintf(errortext, ET_SIZE, "Slice Type invalid in ExplicitPyramidFormat param. Please check configuration file.");
          error (errortext, 400);
          break;
        }
        slice_read = 1;
      }
      else
      {
        //! Next is Display Order
        if (order_read == 0)
        {
          if (isdigit((int)(*(input->ExplicitPyramidFormat+i))))
          {
            sscanf(input->ExplicitPyramidFormat+i,"%d",&display_no);
            gop_structure[coded_frame].display_no = display_no;
            order_read = 1;
            if (display_no<0 || display_no>=input->jumpd)
            {
              snprintf(errortext, ET_SIZE, "Invalid Frame Order value. Frame position needs to be in [0,%d] range.",input->jumpd-1);
              error (errortext, 400);          
            }
            for (k=0;k<coded_frame;k++)
            {
              if (gop_structure[k].display_no == display_no)
              {
                snprintf(errortext, ET_SIZE, "Frame Order value %d in frame %d already used for enhancement frame %d.",display_no,coded_frame,k);
                error (errortext, 400);          
              }
            }
          }
          else
          {
            snprintf(errortext, ET_SIZE, "Slice Type needs to be followed by Display Order. Please check configuration file.");
            error (errortext, 400);
          }
        }
        else if (order_read == 1)
        { 
          if (stored_read == 0 && !(isdigit((int)(*(input->ExplicitPyramidFormat+i)))))
          {
            switch (input->ExplicitPyramidFormat[i])
            {
            case 'E':
            case 'e':
              gop_structure[coded_frame].reference_idc = NALU_PRIORITY_DISPOSABLE;
              break;
            case 'R':
            case 'r':
              gop_structure[coded_frame].reference_idc= NALU_PRIORITY_HIGH;
              break;
            default:
              snprintf(errortext, ET_SIZE, "Reference_IDC invalid in ExplicitPyramidFormat param. Please check configuration file.");
              error (errortext, 400);
              break;
            }
            stored_read = 1;          
          }