h263parse.c

audio-video-codecs.rar语音编解码器

            return H263_STATUS_PARSE_ERROR;
          }
        }
      } else {
        VPicFmt->height = h263_pic_height[source_format - 1];
        VPicFmt->width = h263_pic_width[source_format - 1];
      }

      if (VPic->PCF) { /* custom picture clock frequency */
        code = h263_GetBits9(pInfo, 8);
        VPic->clock_conversion_code = code >> 7;
        VPic->clock_divisor = code & 0x7F;
        if (VPic->clock_divisor == 0) {
          h263_Error("Error: Zero clock divisor");
          return H263_STATUS_PARSE_ERROR;
        }
      }
    }

    if (VPic->PCF) { /* custom picture clock frequency */
      etr = h263_GetBits9(pInfo, 2);
      VPic->temporal_reference += (etr << 8);
    }
    if (VPic->ufep == 1) {
      if (oppmodes.UMV) {
        code = h263_GetBit(pInfo);
        if (code)
          VPic->unlimited_UMV = 0;
        else {
          code = h263_GetBit(pInfo);
          if (!code) {
            h263_Error("Error: Invalid UUI");
            return H263_STATUS_PARSE_ERROR;
          }
          VPic->unlimited_UMV = 1;
        }
      }
      if (oppmodes.sliceStruct)
        VPic->sliceSubmodes = h263_GetBits9(pInfo, 2); /* if ufep==0, the last decoded value is used */
    }
    if (scalability) {
      VPic->enh_layer_num = h263_GetBits9(pInfo, 4);
      if (VPic->enh_layer_num == 0) {
        h263_Error("Error: Invalid enhanced layer number");
        return H263_STATUS_PARSE_ERROR;
      }
      VSeqOppModes = &(pInfo->VideoSequence.oppmodes[VPic->enh_layer_num - 1]);
      VSeqFmt = &(pInfo->VideoSequence.format[VPic->enh_layer_num - 1]);
      if (VPic->ufep == 1) {
        VPic->ref_layer_num = h263_GetBits9(pInfo, 4);
        if (VPic->ref_layer_num == 0) {
          h263_Error("Error: Invalid reference layer number");
          return H263_STATUS_PARSE_ERROR;
        }
        pInfo->VideoSequence.ref_layer_num[VPic->enh_layer_num - 1] = VPic->ref_layer_num;
        if (VPicFmt->height != pInfo->VideoSequence.format[VPic->ref_layer_num - 1].height) {
          if (VPicFmt->width != pInfo->VideoSequence.format[VPic->ref_layer_num - 1].width)
            VPicFmt->scalability_type = H263_SCALABILITY_SPATIAL_XY;
          else
            VPicFmt->scalability_type = H263_SCALABILITY_SPATIAL_Y;
        } else {
          if (VPicFmt->width != pInfo->VideoSequence.format[VPic->ref_layer_num - 1].width)
            VPicFmt->scalability_type = H263_SCALABILITY_SPATIAL_X;
          else
            VPicFmt->scalability_type = (VPic->picture_coding_type == H263_PIC_TYPE_B ? H263_SCALABILITY_TEMPORAL : H263_SCALABILITY_SNR);
        }
      } else {
        VPic->ref_layer_num = pInfo->VideoSequence.ref_layer_num[VPic->enh_layer_num - 1];
        if (VPic->picture_coding_type == H263_PIC_TYPE_B) {
          if (pInfo->VideoSequence.prev_pic_type[VPic->enh_layer_num - 1] != H263_PIC_TYPE_B)
            VPic->ref_layer_num = pInfo->VideoSequence.ref_layer_num_b[VPic->enh_layer_num - 1] = VPic->enh_layer_num;
          else
            VPic->ref_layer_num = pInfo->VideoSequence.ref_layer_num_b[VPic->enh_layer_num - 1];
        }
      }
    } else {
      VPic->enh_layer_num = 1;
      VSeqOppModes = &(pInfo->VideoSequence.oppmodes[0]);
      VSeqFmt = &(pInfo->VideoSequence.format[0]);
    }

    if (oppmodes.RPS) {
      if (VPic->ufep == 1) {
        VPic->RPSflags = h263_GetBits9(pInfo, 3);
        if (VPic->RPSflags < 4) {
          h263_Error("Error: Invalid PRSMF");
          return H263_STATUS_PARSE_ERROR;
        }
      }

      code = h263_GetBit(pInfo); /* TRPI */
      if (code) {
        VPic->pred_temp_ref = h263_GetBits(pInfo, 10); /* TRP */
      }

      code = h263_GetBit(pInfo); /* BCI */
      if (code) {
        h263_parse_BCM(pInfo); /* not implemented yet !!! */
      } else {
        code = h263_GetBit(pInfo);
        if (!code) {
          h263_Error("Error: Invalid BCI");
          return H263_STATUS_PARSE_ERROR;
        }
      }
    }

    if (modes.resample) {
      VPic->wda = h263_GetBits9(pInfo, 2);
      if (VPic->wda < 2) {
        h263_Error("Error: Invalid wda");
        return H263_STATUS_PARSE_ERROR;
      }
      VPic->wda &= 1;
      h263_decode_resampleParams(pInfo);
    }

    if (VPic->ufep == 1) {
      *VSeqOppModes = oppmodes;
      *VPicOppModes = oppmodes;
      *VSeqFmt = *VPicFmt;
    } else {
      *VPicOppModes = *VSeqOppModes;
      *VPicFmt = *VSeqFmt;
    }

    VPic->height = VPicFmt->height;
    VPic->width = VPicFmt->width;

  } else { /* PLUSPTYPE */

    VPic->rtype = 0;
    code = h263_GetBits(pInfo, 5); /* the rest of PTYPE */

    VPic->picture_coding_type = (code >> 4) & 1;
    modes.UMV = (code >> 3) & 1;
    modes.SAC = (code >> 2) & 1;
    modes.advPred = (code >> 1) & 1;
    modes.PBframes = code & 1;
    modes.redResUp = 0;
    modes.resample = 0;

    if (modes.PBframes)
      VPic->picture_coding_type = H263_PIC_TYPE_PB;

    VSeqOppModes = &(pInfo->VideoSequence.oppmodes[0]);
    h263_zero_oppmodes(VSeqOppModes);
    h263_zero_oppmodes(VPicOppModes);
    VPic->height = h263_pic_height[source_format - 1];
    VPic->width = h263_pic_width[source_format - 1];

/* ??? may need that only if there are frames with and without PLUSPTYPE in the same sequence
    pInfo->VideoSequence.format[0].height = VPic->height;
    pInfo->VideoSequence.format[0].width = VPic->width;
*/
  }

  *VPicModes = modes;

  /* Mode restrictions (Rec. 5.1.4.5)  ??? */
  if (VPic->picture_coding_type == H263_PIC_TYPE_I) {
    VPicModes->UMV = VPicModes->advPred =
      VPicOppModes->UMV = VPicOppModes->advPred =
      VPicOppModes->altInterVLC = 0;
      VPicModes->resample = VPicModes->redResUp = 0;
  } else if (VPic->picture_coding_type == H263_PIC_TYPE_B) {
    VPicModes->SAC = VPicOppModes->SAC =
      VPicOppModes->deblockFilt =
      VPicOppModes->advPred = 0;
  } else if (VPic->picture_coding_type == H263_PIC_TYPE_EI) {
    VPicModes->UMV = VPicModes->SAC = VPicModes->advPred =
    VPicOppModes->UMV = VPicOppModes->SAC = VPicOppModes->advPred =
      VPicOppModes->altInterVLC = 0;
      VPicModes->resample = VPicModes->redResUp = 0;
  } else if (VPic->picture_coding_type == H263_PIC_TYPE_EP) {
    VPicModes->SAC = VPicModes->advPred = 0;
    VPicOppModes->SAC = VPicOppModes->advPred = 0;
  }

  VPic->pic_quant = h263_GetBits9(pInfo, 5);

  if (!VPic->plusptype) {
    VPic->CPM = h263_GetBit(pInfo);
    if (VPic->CPM)
      VPic->PSBI = h263_GetBits9(pInfo, 2);
  }

#if 0
  if (VPic->width != VSeq->format[VPic->enh_layer_num - 1].width || VPic->height != VSeq->format[VPic->enh_layer_num - 1].height) { /* ??? */
    if (!VPicModes->resample && !scalability && VPic->picture_coding_type != H263_PIC_TYPE_I) {
      h263_Error("Error: Source format change is incompatible with picture type");
      return H263_STATUS_PARSE_ERROR;
    }
  }
#endif

  if (VPic->picture_coding_type == H263_PIC_TYPE_PB ||
    VPic->picture_coding_type == H263_PIC_TYPE_iPB) {

    if (VPic->PCF)
      VPic->temporal_reference_B = h263_GetBits9(pInfo, 5);
    else
      VPic->temporal_reference_B = h263_GetBits9(pInfo, 3);

     VPic->dbquant = h263_GetBits9(pInfo, 2);
  }

  for (;;) {
    code = h263_GetBit(pInfo); /* pei */
    if (!code)
      break;
    code = h263_GetBits9(pInfo, 8); /* psupp (Annex L) TODO ??? */
  }

  if (!VPicModes->redResUp) {
    VPic->MacroBlockPerRow = (VPic->width + 15) >> 4;
    VPic->MacroBlockPerCol = (VPic->height + 15) >> 4;
    if (VPic->height <= 400) {
      VPic->RowsPerGOB = 1;
      VPic->num_gobs_in_pic = VPic->MacroBlockPerCol;
    } else if (VPic->height <= 800) {
      VPic->RowsPerGOB = 2;
      VPic->num_gobs_in_pic = (VPic->MacroBlockPerCol  + 1) >> 1;
    } else { /* if (VPic->height <= 1152) */
      VPic->RowsPerGOB = 4;
      VPic->num_gobs_in_pic = (VPic->MacroBlockPerCol + 3) >> 2;
    }
  } else {
    VPic->MacroBlockPerRow = (VPic->width + 31) >> 5;
    VPic->MacroBlockPerCol = (VPic->height + 31) >> 5;
    if (VPic->height <= 800) {
      VPic->RowsPerGOB = 1;
      VPic->num_gobs_in_pic = VPic->MacroBlockPerCol;
    } else { /* if (VPic->height <= 1152) */
      VPic->RowsPerGOB = 2;
      VPic->num_gobs_in_pic = (VPic->MacroBlockPerCol + 1) >> 1;
    }
  }

  return H263_STATUS_OK;
}

Ipp32s h263_ParseGOBHeader(h263_Info* pInfo)
{
  Ipp32u code;
  code = h263_ShowBits(pInfo, 17);
  if (code > 1)                        /* No GOB header  */
    return 0;
  if (code == 1) {                     /* GOB Start code, no GSTUF */
    h263_FlushBits(pInfo, 17);
  } else {
    Ipp32s index = 2 + ((pInfo->bitoff + 7) >> 3);
    if (pInfo->bufptr[index] > 127) {  /* GOB Start code, with GSTUF */
      pInfo->bufptr += index;
      pInfo->bitoff = 1;
    } else {
      return -1;
    }
  }

  pInfo->VideoSequence.VideoPicture.gob_number = h263_GetBits9(pInfo, 5);
  if (pInfo->VideoSequence.VideoPicture.gob_number > 30) /* EOS or EOSBS */
    return 1;

  if (pInfo->VideoSequence.VideoPicture.CPM)
    pInfo->VideoSequence.VideoPicture.GSBI = h263_GetBits9(pInfo, 2);

  pInfo->VideoSequence.VideoPicture.GFID = h263_GetBits9(pInfo, 2);

  pInfo->VideoSequence.VideoPicture.pic_quant = h263_GetBits9(pInfo, 5);

  return 1;
}