h263parse.c

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

/* ///////////////////////////////////////////////////////////////////////
//
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (c) 2005 Intel Corporation. All Rights Reserved.
//
//  Description:    Parses H.263++ headers
//
*/

#include "h263.h"
#include "h263dec.h"


static void h263_zero_oppmodes(h263_OPPTYPEmodes *modes)
{
  ippsZero_8u((Ipp8u *)modes, sizeof(h263_OPPTYPEmodes));
}

static void h263_zero_modes(h263_PTYPEmodes *modes)
{
  ippsZero_8u((Ipp8u *)modes, sizeof(h263_PTYPEmodes));
}

static h263_Status h263_parse_BCM(h263_Info* pInfo)
{
#if 0
  h263_VideoPicture *VPic = &pInfo->VideoSequence.VideoPicture;
  Ipp32u code;

  code = h263_GetBits(pInfo, 14);

  VPic->back_mess_type = code >> 12;
  if (VPic->back_mess_type < 2)
    return H263_STATUS_PARSE_ERROR;

  VPic->URF = (code >> 11) & 1;
  VPic->BT_TR = (code >> 1) & 0x3FF;

  if (code & 1) /* ELNUMI */
    VPic->BT_ELNUM = h263_GetBits9(pInfo, 4);
  else
    VPic->BT_ELNUM = 0; /* ??? */

  VPic->BCPM = h263_GetBit(pInfo);
  if (VPic->BCPM)
    VPic->BSBI = h263_GetBits9(pInfo, 2);

  h263_FlushBits(pInfo, 1); /* BEPB1 - only if videomux mode is in use ???s */

  /* GOB number / MBA ......*/
#endif
  return H263_STATUS_OK;
}


static h263_Status h263_decode_resampleParams(h263_Info* pInfo)
{
  h263_VideoPicture *VPic = &pInfo->VideoSequence.VideoPicture;
  h263_PictureFormat *VPicFmt = &pInfo->VideoSequence.VideoPicture.format;
  int i, wx, wy, bit, scaleX, scaleY;
  Ipp32u bits;
  IppMotionVector *ref_warps;

  if (VPic->picture_coding_type != H263_PIC_TYPE_EP) {
    for (i = 0; i < 4; i++) {
      h263_DecodeMVD_umvplus(pInfo, &wx, &wy);
      VPic->warpParams[i].dx = (Ipp16s)wx;
      VPic->warpParams[i].dy = (Ipp16s)wy;
    }
    VPic->fillMode = h263_GetBits9(pInfo, 2);

    if (VPic->fillMode == 0) {
      VPic->fillColor[0] = h263_GetBits9(pInfo, 8);

      for (i = 1; i < 3; i++) {
        bits = h263_GetBits9(pInfo, 9);
#ifdef H263_METICULOUS
        if (bits & 0x100) {
          h263_Error("Error: Wrong Color Fill (zero anti-emulation bit)");
          return H263_STATUS_PARSE_ERROR;
        }
#endif
        VPic->fillColor[i] = bits & 0xff;
      }
    }
  } else { /* one-bit refinements */
    bits = h263_GetBits9(pInfo, 8);

    if (VPic->ref_layer_num == 1)
      ref_warps = pInfo->VideoSequence.warpParams;
    else
      ref_warps = pInfo->VideoSequence.enhLayers[VPic->ref_layer_num - 2]->warpParams;

    scaleX = (VPicFmt->scalability_type == H263_SCALABILITY_SPATIAL_Y ? 0 : 1);
    scaleY = (VPicFmt->scalability_type == H263_SCALABILITY_SPATIAL_X ? 0 : 1);

    /* refinement should be 0 if scale == 0 ??? */

    for (i = 0; i < 4; i++) {
      bit = (bits >> (7 - 2*i)) & 1;
      pInfo->VideoSequence.enhLayers[VPic->enh_layer_num - 2]->warpParams[i].dx =
        VPic->warpParams[i].dx = (Ipp16s)((ref_warps[i].dx << scaleX) + bit);
      bit = (bits >> (6 - 2*i)) & 1;
      pInfo->VideoSequence.enhLayers[VPic->enh_layer_num - 2]->warpParams[i].dy =
        VPic->warpParams[i].dy = (Ipp16s)((ref_warps[i].dy << scaleY) + bit);
    }
    /* fillMode of the ref layer is used -> the base layer fillMode is used in ALL enh layers ??? */
    VPic->fillMode = pInfo->VideoSequence.fillMode;
    if (VPic->fillMode == 0) {
      for (i = 0; i < 3; i++)
        VPic->fillColor[i] = pInfo->VideoSequence.fillColor[i];
    }
  }

  return H263_STATUS_OK;
}



h263_Status h263_Parse_PictureHeader(h263_Info* pInfo)
{
/*  h263_VideoSequence *VSeq = &pInfo->VideoSequence; */
  h263_VideoPicture *VPic = &pInfo->VideoSequence.VideoPicture;
  Ipp32u code;
  h263_PTYPEmodes *VPicModes = &pInfo->VideoSequence.VideoPicture.modes;

  h263_OPPTYPEmodes *VSeqOppModes;
  h263_OPPTYPEmodes *VPicOppModes = &pInfo->VideoSequence.VideoPicture.oppmodes;
  h263_PictureFormat *VSeqFmt;
  h263_PictureFormat *VPicFmt = &pInfo->VideoSequence.VideoPicture.format;

  h263_PTYPEmodes modes;
  h263_OPPTYPEmodes oppmodes;

  int source_format;
  int etr;
  int scalability;

  h263_FlushBits(pInfo, 22); /* Flush Picture Start Code */

  VPic->prev_temporal_reference = VPic->temporal_reference;
  VPic->temporal_reference = h263_GetBits9(pInfo, 8);

  code = h263_GetBits(pInfo, 8);  /* PTYPE */

  if ((code >> 6) != 2) {
    h263_Error("Error: Wrong PTYPE (first 2 bits)");
    return H263_STATUS_PARSE_ERROR;
  }

  VPic->split_screen_indicator = (code >> 5) & 1;
  VPic->document_camera_indicator = (code >> 4) & 1;
  VPic->full_picture_freeze_release = (code >> 3) & 1;
  source_format = code & 7;

  if (source_format == 0 || source_format == 6) {
    h263_Error("Error: Bad value of source format");
    return H263_STATUS_PARSE_ERROR;
  }

  if (source_format == 7)
    VPic->plusptype = 1;
  else
    VPic->plusptype = 0;

  VPic->prev_PCF = VPic->PCF;
  VPic->prev_clock_conversion_code = VPic->clock_conversion_code;
  VPic->prev_clock_divisor = VPic->clock_divisor;

  VPic->PCF = 0;
  VPic->clock_conversion_code = 0;
  VPic->clock_divisor = 0;

  if (VPic->plusptype) { /* PLUSPTYPE */

    h263_zero_modes(&modes);

    VPic->ufep = h263_GetBits9(pInfo, 3);
    if (VPic->ufep > 1) {
#ifdef H263_METICULUOS
      h263_Error("Error: Wrong UFEP value");
      return H263_STATUS_PARSE_ERROR;
#endif
      VPic->ufep = 1;
    }

    if (VPic->ufep == 1) { /* OPPTYPE  */
      code = h263_GetBits(pInfo, 18);
      source_format = code >> 15;
      if (source_format == 0 || source_format == 7) {
        h263_Error("Error: Bad value of plustype source format");
        return H263_STATUS_PARSE_ERROR;
      }
      VPic->PCF = (Ipp8u)((code >> 14) & 1); /* ??? */
      oppmodes.UMV = (Ipp8u)((code >> 13) & 1);
      oppmodes.SAC = (Ipp8u)((code >> 12) & 1);
      oppmodes.advPred = (Ipp8u)((code >> 11) & 1);
      oppmodes.advIntra = (Ipp8u)((code >> 10) & 1);
      oppmodes.deblockFilt = (Ipp8u)((code >> 9) & 1);
      oppmodes.sliceStruct = (Ipp8u)((code >> 8) & 1);
      oppmodes.RPS = (Ipp8u)((code >> 7) & 1);
      oppmodes.ISD = (Ipp8u)((code >> 6) & 1);
      oppmodes.altInterVLC = (Ipp8u)((code >> 5) & 1);
      oppmodes.modQuant = (Ipp8u)((code >> 4) & 1);

#ifdef H263_METICULOUS
      if ((code & 15) != 8) {
        h263_Error("Error: Wrong OPPTYPE (last 4 bits)");
        return H263_STATUS_PARSE_ERROR;
      }
#endif
    } else { /* OPPTYPE  */
      h263_zero_oppmodes(&oppmodes);
    }

    code = h263_GetBits(pInfo, 9); /* MPPTYPE */
    VPic->picture_coding_type = code >> 6;
    if (VPic->picture_coding_type > 5) {
      h263_Error("Error: Bad value of picture coding type (in MPPTYPE)");
      return H263_STATUS_PARSE_ERROR;
    }
    if (VPic->picture_coding_type == H263_PIC_TYPE_B || VPic->picture_coding_type == H263_PIC_TYPE_EP || VPic->picture_coding_type == H263_PIC_TYPE_EI)
      scalability = 1;
    else
      scalability = 0;

    modes.resample = (code >> 5) & 1;
    modes.redResUp = (code >> 4) & 1;
    VPic->rtype = (code >> 3) & 1;
#ifdef H263_METICULOUS
    if ((code & 7) != 1) {
      h263_Error("Error: Wrong MPPTYPE (last 3 bits)");
      return H263_STATUS_PARSE_ERROR;
    }
#endif

#ifdef H263_METICULOUS
    if (VPic->rtype && !(VPic->picture_coding_type == H263_PIC_TYPE_iPB ||
                         VPic->picture_coding_type == H263_PIC_TYPE_P ||
                         VPic->picture_coding_type == H263_PIC_TYPE_EP)) {
      h263_Error("Error: Wrong RTYPE");
      return H263_STATUS_PARSE_ERROR;
    }
#endif

    VPic->CPM = h263_GetBit(pInfo);
    if (VPic->CPM)
      VPic->PSBI = h263_GetBits9(pInfo, 2);

    if (VPic->ufep == 1) {
      if (source_format == 6) {  /* custom picture format */
        int pwi, phi;
        code = h263_GetBits(pInfo, 23);
        VPicFmt->PAR_code = code >> 19;
        pwi = (code >> 10) & 511;

#ifdef H263_METICULOUS
        if ((code >> 9) & 1) {
          h263_Error("Error: Wrong CPFMT (zero anti-emulation bit)");
          return H263_STATUS_PARSE_ERROR;
        }
#endif
        phi = code & 511;

        VPicFmt->height = phi * 4;
        VPicFmt->width = (pwi + 1) * 4;

        if (VPicFmt->PAR_code == H263_ASPECT_RATIO_EXTPAR) { /* Extended PAR */
          VPicFmt->PAR_width = h263_GetBits9(pInfo, 8);
          if (VPicFmt->PAR_width == 0) {
            h263_Error("Error: Zero PAR width");