q_offsets.c

H.264编码实现

/*!
 *************************************************************************************
 * \file q_offsets.c
 *
 * \brief
 *    read Quantization Offset matrix parameters from input file: q_OffsetMatrix.cfg
 *
 *************************************************************************************
 */

#include "global.h"
#include "memalloc.h"
#include "q_matrix.h"
#include "q_offsets.h"

extern char *GetConfigFileContent (char *Filename, int error_type);

#define MAX_ITEMS_TO_PARSE  2000

int offset4x4_check[6] = { 0, 0, 0, 0, 0, 0 };
int offset8x8_check[6] = { 0, 0, 0, 0, 0, 0 };

static const char OffsetType4x4[15][24] = {
  "INTRA4X4_LUMA_INTRA",
  "INTRA4X4_CHROMAU_INTRA",
  "INTRA4X4_CHROMAV_INTRA",
  "INTRA4X4_LUMA_INTERP",
  "INTRA4X4_CHROMAU_INTERP",
  "INTRA4X4_CHROMAV_INTERP",
  "INTRA4X4_LUMA_INTERB",
  "INTRA4X4_CHROMAU_INTERB",
  "INTRA4X4_CHROMAV_INTERB",
  "INTER4X4_LUMA_INTERP",
  "INTER4X4_CHROMAU_INTERP",
  "INTER4X4_CHROMAV_INTERP",
  "INTER4X4_LUMA_INTERB",
  "INTER4X4_CHROMAU_INTERB",
  "INTER4X4_CHROMAV_INTERB"
};

static const char OffsetType8x8[15][24] = {
  "INTRA8X8_LUMA_INTRA",
  "INTRA8X8_LUMA_INTERP",
  "INTRA8X8_LUMA_INTERB",
  "INTER8X8_LUMA_INTERP",
  "INTER8X8_LUMA_INTERB",
  "INTRA8X8_CHROMAU_INTRA",
  "INTRA8X8_CHROMAU_INTERP",
  "INTRA8X8_CHROMAU_INTERB",
  "INTER8X8_CHROMAU_INTERP",
  "INTER8X8_CHROMAU_INTERB",
  "INTRA8X8_CHROMAV_INTRA",
  "INTRA8X8_CHROMAV_INTERP",
  "INTRA8X8_CHROMAV_INTERB",
  "INTER8X8_CHROMAV_INTERP",
  "INTER8X8_CHROMAV_INTERB"
};


int *****LevelOffset4x4Comp;
int *****LevelOffset8x8Comp;

// global pointers for level offset matrices
int ****ptLevelOffset4x4;
int ****ptLevelOffset8x8;

int AdaptRndWeight;
int AdaptRndCrWeight;

short **OffsetList4x4input;
short **OffsetList8x8input;
short ***OffsetList4x4;
short ***OffsetList8x8;

void InitOffsetParam ();

const int OffsetBits = 11;

static const short Offset_intra_default_intra[16] = {
  682, 682, 682, 682,
  682, 682, 682, 682,
  682, 682, 682, 682,
  682, 682, 682, 682
};

static const short Offset_intra_default_chroma[16] = {
  682, 682, 682, 682,
  682, 682, 682, 682,
  682, 682, 682, 682,
  682, 682, 682, 682
};


static const short Offset_intra_default_inter[16] = {
  342, 342, 342, 342,
  342, 342, 342, 342,
  342, 342, 342, 342,
  342, 342, 342, 342,
};

static const short Offset_inter_default[16] = {
  342, 342, 342, 342,
  342, 342, 342, 342,
  342, 342, 342, 342,
  342, 342, 342, 342,
};

static const short Offset8_intra_default_intra[64] = {
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682
};

static const short Offset8_intra_default_chroma[64] = {
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682,
  682, 682, 682, 682, 682, 682, 682, 682
};

static const short Offset8_intra_default_inter[64] = {
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342
};

static const short Offset8_inter_default[64] = {
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342,
  342, 342, 342, 342, 342, 342, 342, 342
};

/*!
 ***********************************************************************
 * \brief
 *    Allocate Q matrix arrays
 ***********************************************************************
 */
void allocate_QOffsets ()
{
  int max_bitdepth = imax(params->output.bit_depth[0], params->output.bit_depth[1]);
  int max_qp = (3 + 6*(max_bitdepth));

  get_mem5Dint(&LevelOffset4x4Comp, 3, 2, max_qp + 1, 4, 4);
  get_mem5Dint(&LevelOffset8x8Comp, 3, 2, max_qp + 1, 8, 8);

  if (params->AdaptRoundingFixed)
  {
    get_mem3Dshort(&OffsetList4x4, 1, 25, 16);
    get_mem3Dshort(&OffsetList8x8, 1, 15, 64);    
  }
  else
  {
    get_mem3Dshort(&OffsetList4x4, max_qp + 1, 25, 16);
    get_mem3Dshort(&OffsetList8x8, max_qp + 1, 15, 64);    
  }

  get_mem2Dshort(&OffsetList4x4input, 25, 16);
  get_mem2Dshort(&OffsetList8x8input, 15, 64);
}

/*!
 ***********************************************************************
 * \brief
 *    Free Q matrix arrays
 ***********************************************************************
 */
void free_QOffsets ()
{
  free_mem5Dint(LevelOffset4x4Comp);
  free_mem5Dint(LevelOffset8x8Comp);

  if (params->AdaptRoundingFixed)
  {
    free_mem3Dshort(OffsetList8x8);
    free_mem3Dshort(OffsetList4x4);    
  }
  else
  {
    free_mem3Dshort(OffsetList8x8);
    free_mem3Dshort(OffsetList4x4);    
  }

  free_mem2Dshort(OffsetList8x8input);
  free_mem2Dshort(OffsetList4x4input);
}


/*!
 ***********************************************************************
 * \brief
 *    Check the parameter name.
 * \param s
 *    parameter name string
 * \param type
 *    4x4 or 8x8 offset matrix type
 * \return
 *    the index number if the string is a valid parameter name,         \n
 *    -1 for error
 ***********************************************************************
 */

int CheckOffsetParameterName (char *s, int *type)
{
  int i = 0;

  *type = 0;
  while ((OffsetType4x4[i] != NULL) && (i < 15))
  {
    if (0 == strcmp (OffsetType4x4[i], s))
      return i;
    else
      i++;
  }

  i = 0;
  *type = 1;
  while ((OffsetType8x8[i] != NULL) && (i < 15))
  {
    if (0 == strcmp (OffsetType8x8[i], s))
      return i;
    else
      i++;
  }

  return -1;
}

/*!
 ***********************************************************************
 * \brief
 *    Parse the Q Offset Matrix values read from cfg file.
 * \param buf
 *    buffer to be parsed
 * \param bufsize
 *    buffer size of buffer
 ***********************************************************************
 */
void ParseQOffsetMatrix (char *buf, int bufsize)
{
  char *items[MAX_ITEMS_TO_PARSE];
  int MapIdx;
  int item = 0;
  int InString = 0, InItem = 0;
  char *p = buf;
  char *bufend = &buf[bufsize];
  int IntContent;
  int i, j, range, type, cnt;
  short *OffsetList;

  while (p < bufend)
  {
    switch (*p)
    {
      case 13:
        p++;
        break;
      case '#':                 // Found comment
        *p = '\0';              // Replace '#' with '\0' in case of comment immediately following integer or string
        while (*p != '\n' && p < bufend)  // Skip till EOL or EOF, whichever comes first
          p++;
        InString = 0;
        InItem = 0;
        break;
      case '\n':
        InItem = 0;
        InString = 0;
      *p++ = '\0';
        break;
      case ' ':
      case '\t':              // Skip whitespace, leave state unchanged
        if (InString)
          p++;
        else
        {                     // Terminate non-strings once whitespace is found
          *p++ = '\0';
          InItem = 0;
        }
        break;

      case '"':               // Begin/End of String
        *p++ = '\0';
        if (!InString)
        {
          items[item++] = p;
          InItem = ~InItem;
        }
        else
          InItem = 0;
        InString = ~InString; // Toggle
        break;

      case ',':
        p++;
        InItem = 0;
        break;

      default:
        if (!InItem)
        {
          items[item++] = p;
          InItem = ~InItem;
        }
        p++;
    }
  }

  item--;

  for (i = 0; i < item; i += cnt)
  {
    cnt = 0;
    if (0 > (MapIdx = CheckOffsetParameterName (items[i + cnt], &type)))
    {
      snprintf (errortext, ET_SIZE,
        " Parsing error in config file: Parameter Name '%s' not recognized.",
        items[i + cnt]);
      error (errortext, 300);
    }
    cnt++;
    if (strcmp ("=", items[i + cnt]))
    {
      snprintf (errortext, ET_SIZE,
        " Parsing error in config file: '=' expected as the second token in each item.");
      error (errortext, 300);
    }
    cnt++;

    if (!type) //4x4 Matrix
    {
      range = 16;
      OffsetList = OffsetList4x4input[MapIdx];
      offset4x4_check[MapIdx] = 1; //to indicate matrix found in cfg file
    }
    else //8x8 matrix
    {
      range = 64;
      OffsetList = OffsetList8x8input[MapIdx];
      offset8x8_check[MapIdx] = 1; //to indicate matrix found in cfg file
    }

    for (j = 0; j < range; j++)
    {
      if (1 != sscanf (items[i + cnt + j], "%d", &IntContent))
      {
        snprintf (errortext, ET_SIZE,
          " Parsing error: Expected numerical value for Parameter of %s, found '%s'.",
          items[i], items[i + cnt + j]);
        error (errortext, 300);
      }

      OffsetList[j] = (short) IntContent; //save value in matrix
    }
    cnt += j;
    printf (".");
  }
}


/*!