y4menc.c

   1 /*
   2  *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11 #include <assert.h>
  12 #include "./y4menc.h"
  13
  14 int y4m_write_file_header(char *buf, size_t len, int width, int height,
  15                           const struct VpxRational *framerate,
  16                           vpx_img_fmt_t fmt, unsigned int bit_depth) {
  17   const char *color;
  18   switch (bit_depth) {
  19     case 8:
  20       color = fmt == VPX_IMG_FMT_444A ? "C444alpha\n" :
  21               fmt == VPX_IMG_FMT_I444 ? "C444\n" :
  22               fmt == VPX_IMG_FMT_I422 ? "C422\n" :
  23               "C420jpeg\n";
  24       break;
  25     case 9:
  26       color = fmt == VPX_IMG_FMT_I44416 ? "C444p9 XYSCSS=444P9\n" :
  27               fmt == VPX_IMG_FMT_I42216 ? "C422p9 XYSCSS=422P9\n" :
  28               "C420p9 XYSCSS=420P9\n";
  29       break;
  30     case 10:
  31       color = fmt == VPX_IMG_FMT_I44416 ? "C444p10 XYSCSS=444P10\n" :
  32               fmt == VPX_IMG_FMT_I42216 ? "C422p10 XYSCSS=422P10\n" :
  33               "C420p10 XYSCSS=420P10\n";
  34       break;
  35     case 12:
  36       color = fmt == VPX_IMG_FMT_I44416 ? "C444p12 XYSCSS=444P12\n" :
  37               fmt == VPX_IMG_FMT_I42216 ? "C422p12 XYSCSS=422P12\n" :
  38               "C420p12 XYSCSS=420P12\n";
  39       break;
  40     case 14:
  41       color = fmt == VPX_IMG_FMT_I44416 ? "C444p14 XYSCSS=444P14\n" :
  42               fmt == VPX_IMG_FMT_I42216 ? "C422p14 XYSCSS=422P14\n" :
  43               "C420p14 XYSCSS=420P14\n";
  44       break;
  45     case 16:
  46       color = fmt == VPX_IMG_FMT_I44416 ? "C444p16 XYSCSS=444P16\n" :
  47               fmt == VPX_IMG_FMT_I42216 ? "C422p16 XYSCSS=422P16\n" :
  48               "C420p16 XYSCSS=420P16\n";
  49       break;
  50     default:
  51       color = NULL;
  52       assert(0);
  53   }
  54   return snprintf(buf, len, "YUV4MPEG2 W%u H%u F%u:%u I%c %s", width, height,
  55                   framerate->numerator, framerate->denominator, 'p', color);
  56 }
  57
  58 int y4m_write_frame_header(char *buf, size_t len) {
  59   return snprintf(buf, len, "FRAME\n");
  60 }