src/add-ons/media/plugins/matroska/matroska_util.cpp

   1 /*
   2  * Copyright (c) 2004, Marcus Overhagen
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without modification,
   6  * are permitted provided that the following conditions are met:
   7  *
   8  *  * Redistributions of source code must retain the above copyright notice,
   9  *    this list of conditions and the following disclaimer.
  10  *  * Redistributions in binary form must reproduce the above copyright notice,
  11  *    this list of conditions and the following disclaimer in the documentation
  12  *    and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  19  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  21  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  22  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  23  * OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include "matroska_util.h"
  28
  29
  30 bigtime_t
  31 get_duration_in_us(uint64 duration)
  32 {
  33         if (duration > 0)
  34                 return duration / 1000 + ((duration % 1000) ? 1 : 0);
  35         else
  36                 return 12 * 60 * 60 * 1000000LL;
  37 }
  38
  39
  40 float
  41 get_frame_rate(uint64 default_duration)
  42 {
  43         if (default_duration > 1)
  44                 return 1000000000.0 / default_duration;
  45         else
  46                 return 29.97;
  47 }
  48
  49
  50 uint64
  51 get_frame_count_by_frame_rate(uint64 duration, float frame_rate)
  52 {
  53         return uint64((double(duration) * double(frame_rate)) / 1000000000.0);
  54 }
  55
  56
  57 uint64
  58 get_frame_count_by_default_duration(uint64 duration, uint64 default_duration)
  59 {
  60         if (duration > 0 && default_duration > 1)
  61                 return (duration / default_duration) + ((duration % default_duration) ? 1 : 0);
  62         if (duration > 0)
  63                 return (duration * 2997) / 100000000000ull;
  64         return 12 * 60 * 60 * 2997 / 100;
  65 }
  66
  67
  68 void
  69 get_pixel_aspect_ratio(uint16 *width_aspect_ratio, uint16 *height_aspect_ratio,
  70                                            unsigned int pixel_width, unsigned int pixel_height,
  71                                            unsigned int display_width,  unsigned int display_height)
  72 {
  73         printf("get_pixel_aspect_ratio: pixel_width %u, pixel_height %u, display_width %u, display_height %u\n",
  74                         pixel_width, pixel_height, display_width, display_height);
  75
  76         if (pixel_width == display_width && pixel_height == display_height) {
  77                 *width_aspect_ratio = 1;
  78                 *height_aspect_ratio = 1;
  79                 return;
  80         }
  81
  82         double w_aspect = display_width / (double)pixel_width;
  83         double h_aspect = display_height / (double)pixel_height;
  84         w_aspect /= h_aspect;
  85         h_aspect = 1;
  86
  87         printf("w_aspect %.6f, h_aspect %.6f\n", w_aspect, h_aspect);
  88
  89         *width_aspect_ratio = uint16(w_aspect * 10000 + 0.5);
  90         *height_aspect_ratio = 10000;
  91
  92         printf("w_aspect %.6f, h_aspect %.6f, ratio %u:%u\n", w_aspect, h_aspect, *width_aspect_ratio, *height_aspect_ratio);
  93 }