source/output/y4m.cpp

   1 /*****************************************************************************
   2  * Copyright (C) 2013 x265 project
   3  *
   4  * Authors: Steve Borho <steve@borho.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  19  *
  20  * This program is also available under a commercial proprietary license.
  21  * For more information, contact us at license @ x265.com.
  22  *****************************************************************************/
  23
  24 #include "common.h"
  25 #include "output.h"
  26 #include "y4m.h"
  27
  28 using namespace x265;
  29 using namespace std;
  30
  31 Y4MOutput::Y4MOutput(const char *filename, int w, int h, uint32_t fpsNum, uint32_t fpsDenom, int csp)
  32     : width(w)
  33     , height(h)
  34     , colorSpace(csp)
  35     , frameSize(0)
  36 {
  37     ofs.open(filename, ios::binary | ios::out);
  38     buf = new char[width];
  39
  40     const char *cf = (csp >= X265_CSP_I444) ? "444" : (csp >= X265_CSP_I422) ? "422" : "420";
  41
  42     if (ofs)
  43     {
  44         ofs << "YUV4MPEG2 W" << width << " H" << height << " F" << fpsNum << ":" << fpsDenom << " Ip" << " C" << cf << "\n";
  45         header = ofs.tellp();
  46     }
  47
  48     for (int i = 0; i < x265_cli_csps[colorSpace].planes; i++)
  49     {
  50         frameSize += (uint32_t)((width >> x265_cli_csps[colorSpace].width[i]) * (height >> x265_cli_csps[colorSpace].height[i]));
  51     }
  52 }
  53
  54 Y4MOutput::~Y4MOutput()
  55 {
  56     ofs.close();
  57     delete [] buf;
  58 }
  59
  60 bool Y4MOutput::writePicture(const x265_picture& pic)
  61 {
  62     std::ofstream::pos_type outPicPos = header;
  63     outPicPos += (uint64_t)pic.poc * (6 + frameSize);
  64     ofs.seekp(outPicPos);
  65     ofs << "FRAME\n";
  66
  67 #if HIGH_BIT_DEPTH
  68     if (pic.bitDepth > 8 && pic.poc == 0)
  69     {
  70         x265_log(NULL, X265_LOG_WARNING, "y4m: down-shifting reconstructed pixels to 8 bits\n");
  71     }
  72 #else
  73     if (pic.bitDepth > 8 && pic.poc == 0)
  74     {
  75         x265_log(NULL, X265_LOG_WARNING, "y4m: forcing reconstructed pixels to 8 bits\n");
  76     }
  77 #endif
  78
  79     X265_CHECK(pic.colorSpace == colorSpace, "invalid color space\n");
  80
  81 #if HIGH_BIT_DEPTH
  82
  83     // encoder gave us short pixels, downshift, then write
  84     X265_CHECK(pic.bitDepth > 8, "invalid bit depth\n");
  85     int shift = pic.bitDepth - 8;
  86     for (int i = 0; i < x265_cli_csps[colorSpace].planes; i++)
  87     {
  88         uint16_t *src = (uint16_t*)pic.planes[i];
  89         for (int h = 0; h < height >> x265_cli_csps[colorSpace].height[i]; h++)
  90         {
  91             for (int w = 0; w < width >> x265_cli_csps[colorSpace].width[i]; w++)
  92             {
  93                 buf[w] = (char)(src[w] >> shift);
  94             }
  95
  96             ofs.write(buf, width >> x265_cli_csps[colorSpace].width[i]);
  97             src += pic.stride[i] / sizeof(*src);
  98         }
  99     }
 100
 101 #else // if HIGH_BIT_DEPTH
 102
 103     X265_CHECK(pic.bitDepth == 8, "invalid bit depth\n");
 104     for (int i = 0; i < x265_cli_csps[colorSpace].planes; i++)
 105     {
 106         char *src = (char*)pic.planes[i];
 107         for (int h = 0; h < height >> x265_cli_csps[colorSpace].height[i]; h++)
 108         {
 109             ofs.write(src, width >> x265_cli_csps[colorSpace].width[i]);
 110             src += pic.stride[i] / sizeof(*src);
 111         }
 112     }
 113
 114 #endif // if HIGH_BIT_DEPTH
 115
 116     return true;
 117 }