source: SHVCSoftware/branches/SHM-5.1-dev/source/Lib/TLibCommon/TComPicYuvMD5.cpp

/* The copyright in this software is being made available under the BSD
 * License, included below. This software may be subject to other third party
 * and contributor rights, including patent rights, and no such rights are
 * granted under this license.
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 * Copyright (c) 2010-2014, ITU/ISO/IEC
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *    and/or other materials provided with the distribution.
 *  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 */

#include "TComPicYuv.h"
#include "libmd5/MD5.h"

//! \ingroup TLibCommon
//! \{

/**
 * Update md5 using n samples from plane, each sample is adjusted to
 * OUTBIT_BITDEPTH_DIV8.
 */
template<UInt OUTPUT_BITDEPTH_DIV8>
static void md5_block(MD5& md5, const Pel* plane, UInt n)
{
  /* create a 64 byte buffer for packing Pel's into */
  UChar buf[64/OUTPUT_BITDEPTH_DIV8][OUTPUT_BITDEPTH_DIV8];
  for (UInt i = 0; i < n; i++)
  {
    Pel pel = plane[i];
    /* perform bitdepth and endian conversion */
    for (UInt d = 0; d < OUTPUT_BITDEPTH_DIV8; d++)
    {
      buf[i][d] = pel >> (d*8);
    }
  }
  md5.update((UChar*)buf, n * OUTPUT_BITDEPTH_DIV8);
}

/**
 * Update md5 with all samples in plane in raster order, each sample
 * is adjusted to OUTBIT_BITDEPTH_DIV8.
 */
template<UInt OUTPUT_BITDEPTH_DIV8>
static void md5_plane(MD5& md5, const Pel* plane, UInt width, UInt height, UInt stride)
{
  /* N is the number of samples to process per md5 update.
   * All N samples must fit in buf */
  UInt N = 32;
  UInt width_modN = width % N;
  UInt width_less_modN = width - width_modN;

  for (UInt y = 0; y < height; y++)
  {
    /* convert pel's into UInt chars in little endian byte order.
     * NB, for 8bit data, data is truncated to 8bits. */
    for (UInt x = 0; x < width_less_modN; x += N)
      md5_block<OUTPUT_BITDEPTH_DIV8>(md5, &plane[y*stride + x], N);

    /* mop up any of the remaining line */
    md5_block<OUTPUT_BITDEPTH_DIV8>(md5, &plane[y*stride + width_less_modN], width_modN);
  }
}

static void compCRC(Int bitdepth, const Pel* plane, UInt width, UInt height, UInt stride, UChar digest[16])
{
  UInt crcMsb;
  UInt bitVal;
  UInt crcVal = 0xffff;
  UInt bitIdx;
  for (UInt y = 0; y < height; y++)
  {
    for (UInt x = 0; x < width; x++)
    {
      // take CRC of first pictureData byte
      for(bitIdx=0; bitIdx<8; bitIdx++)
      {
        crcMsb = (crcVal >> 15) & 1;
        bitVal = (plane[y*stride+x] >> (7 - bitIdx)) & 1;
        crcVal = (((crcVal << 1) + bitVal) & 0xffff) ^ (crcMsb * 0x1021);
      }
      // take CRC of second pictureData byte if bit depth is greater than 8-bits
      if(bitdepth > 8)
      {
        for(bitIdx=0; bitIdx<8; bitIdx++)
        {
          crcMsb = (crcVal >> 15) & 1;
          bitVal = (plane[y*stride+x] >> (15 - bitIdx)) & 1;
          crcVal = (((crcVal << 1) + bitVal) & 0xffff) ^ (crcMsb * 0x1021);
        }
      }
    }
  }
  for(bitIdx=0; bitIdx<16; bitIdx++)
  {
    crcMsb = (crcVal >> 15) & 1;
    crcVal = ((crcVal << 1) & 0xffff) ^ (crcMsb * 0x1021);
  }

  digest[0] = (crcVal>>8)  & 0xff;
  digest[1] =  crcVal      & 0xff;
}

void calcCRC(TComPicYuv& pic, UChar digest[3][16])
{
  UInt width = pic.getWidth();
  UInt height = pic.getHeight();
  UInt stride = pic.getStride();

  compCRC(g_bitDepthY, pic.getLumaAddr(), width, height, stride, digest[0]);

  width >>= 1;
  height >>= 1;
  stride >>= 1;

  compCRC(g_bitDepthC, pic.getCbAddr(), width, height, stride, digest[1]);
  compCRC(g_bitDepthC, pic.getCrAddr(), width, height, stride, digest[2]);
}

static void compChecksum(Int bitdepth, const Pel* plane, UInt width, UInt height, UInt stride, UChar digest[16])
{
  UInt checksum = 0;
  UChar xor_mask;

  for (UInt y = 0; y < height; y++)
  {
    for (UInt x = 0; x < width; x++)
    {
      xor_mask = (x & 0xff) ^ (y & 0xff) ^ (x >> 8) ^ (y >> 8);
      checksum = (checksum + ((plane[y*stride+x] & 0xff) ^ xor_mask)) & 0xffffffff;

      if(bitdepth > 8)
      {
        checksum = (checksum + ((plane[y*stride+x]>>8) ^ xor_mask)) & 0xffffffff;
      }
    }
  }

  digest[0] = (checksum>>24) & 0xff;
  digest[1] = (checksum>>16) & 0xff;
  digest[2] = (checksum>>8)  & 0xff;
  digest[3] =  checksum      & 0xff;
}

void calcChecksum(TComPicYuv& pic, UChar digest[3][16])
{
  UInt width = pic.getWidth();
  UInt height = pic.getHeight();
  UInt stride = pic.getStride();

  compChecksum(g_bitDepthY, pic.getLumaAddr(), width, height, stride, digest[0]);

  width >>= 1;
  height >>= 1;
  stride >>= 1;

  compChecksum(g_bitDepthC, pic.getCbAddr(), width, height, stride, digest[1]);
  compChecksum(g_bitDepthC, pic.getCrAddr(), width, height, stride, digest[2]);
}
/**
 * Calculate the MD5sum of pic, storing the result in digest.
 * MD5 calculation is performed on Y' then Cb, then Cr; each in raster order.
 * Pel data is inserted into the MD5 function in little-endian byte order,
 * using sufficient bytes to represent the picture bitdepth.  Eg, 10bit data
 * uses little-endian two byte words; 8bit data uses single byte words.
 */
void calcMD5(TComPicYuv& pic, UChar digest[3][16])
{
  /* choose an md5_plane packing function based on the system bitdepth */
  typedef void (*MD5PlaneFunc)(MD5&, const Pel*, UInt, UInt, UInt);
  MD5PlaneFunc md5_plane_func;
  md5_plane_func = g_bitDepthY <= 8 ? (MD5PlaneFunc)md5_plane<1> : (MD5PlaneFunc)md5_plane<2>;

  MD5 md5Y, md5U, md5V;
  UInt width = pic.getWidth();
  UInt height = pic.getHeight();
  UInt stride = pic.getStride();

  md5_plane_func(md5Y, pic.getLumaAddr(), width, height, stride);
  md5Y.finalize(digest[0]);

  md5_plane_func = g_bitDepthC <= 8 ? (MD5PlaneFunc)md5_plane<1> : (MD5PlaneFunc)md5_plane<2>;
  width >>= 1;
  height >>= 1;
  stride >>= 1;

  md5_plane_func(md5U, pic.getCbAddr(), width, height, stride);
  md5U.finalize(digest[1]);

  md5_plane_func(md5V, pic.getCrAddr(), width, height, stride);
  md5V.finalize(digest[2]);
}
//! \}