rawIOv216.cpp

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  *
   3  * $Id$
   4  *
   5  * The MIT License
   6  *
   7  * Copyright (c) 2008 BBC Research
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  *
  27  * ***** END LICENSE BLOCK ***** */
  28
  29 #include <assert.h>
  30 #include "rawIOv216.h"
  31
  32 /* this could be improved by reading a larger chunk and then converting
  33  * the endianness suitably.  Reading / writing converts the chroma values
  34  * to offset binary ycbcr. */
  35 RawFrame& RawReaderV216::read(RawFrame &f)
  36 {
  37         assert(f.chroma == RawFrame::Cr422);
  38
  39         size_t linesRead;
  40         size_t lineLen = f.luma.width() * 2 * 2;
  41         unsigned char *inLine = new unsigned char[lineLen];
  42
  43         for (int y = 0; y < f.luma.height(); y++) {
  44
  45                 linesRead = fread(inLine, lineLen, 1, infile);
  46
  47                 for (int in=0, xy = 0, xc = 0; xy < f.luma.width(); in+=8, xy += 2,
  48                                                                     xc++) {
  49                         /* Cb Y Cr Y */
  50                         f.cb[y][xc] = inLine[in+0] + inLine[in+1] * 256;
  51                         f.luma[y][xy] = inLine[in+2] + inLine[in+3] * 256;
  52                         f.cr[y][xc] = inLine[in+4] + inLine[in+5] * 256;
  53                         f.luma[y][xy+1] = inLine[in+6] + inLine[in+7] * 256;
  54                 }
  55
  56                 if (linesRead < 1)
  57                         goto exit;
  58         }
  59
  60         exit:
  61
  62         //if (feof (infile))
  63         //   throw /* some eof/shortread exception */ ;
  64
  65         free(inLine);
  66         return f;
  67 }
  68
  69 RawFrame& RawReaderV216::read()
  70 {
  71         throw /* unknown framesize */;
  72 }
  73
  74 void RawWriterV216::write(const RawFrame& f) const
  75 {
  76         assert(f.chroma == RawFrame::Cr422);
  77         for (int y = 0; y < f.luma.height(); y++)
  78                 for (int xy = 0, xc = 0; xy < f.luma.width(); xy += 2, xc++) {
  79                         /* Cb Y Cr Y */
  80                         int val = f.cb[y][xc];
  81
  82                         fputc(val & 0xff, outfile);
  83                         fputc((val >> 8) & 0x03, outfile);
  84
  85                         fputc(f.luma[y][xy] & 0xff, outfile);
  86                         fputc((f.luma[y][xy] >> 8) & 0x03, outfile);
  87
  88                         val = f.cr[y][xc];
  89
  90                         fputc(val & 0xff, outfile);
  91                         fputc((val >> 8) & 0x03, outfile);
  92
  93                         fputc((f.luma[y][xy+1] & 0xff), outfile);
  94                         fputc((f.luma[y][xy+1] >> 8) & 0x03, outfile);
  95                 }
  96 }
  97