fg_compute_block_avg

fg_compute_block_avg.c

int16_t fg_compute_block_avg(int16_t *dstSampleBlk8, uint32_t widthComp, uint16_t *pNumSamples,
                      uint8_t ySize, uint8_t xSize, uint8_t bitDepth)
{
  uint32_t blockAvg   = 0;
  uint16_t numSamples = 0;
  uint8_t  k, l;

  for (k = 0; k < ySize; k++)
  {
    for (l = 0; l < xSize; l++)
    {
      blockAvg += dstSampleBlk8[(k*widthComp)+l];
      numSamples++;
    }
  }
  if (numSamples > 0)
  {
    blockAvg /= numSamples;
    blockAvg >>= (bitDepth - 8); /* to handle high bit depths */
  }

  *pNumSamples = numSamples;

  blockAvg = (int16_t) ov_clip_uintp2(blockAvg, 8 );
  return blockAvg;
}