git.sesse.net Git - nageru/blob - futatabi/flags.cpp

   1 #include "flags.h"
   2
   3 #include <getopt.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #include <utility>
   9
  10 using namespace std;
  11
  12 Flags global_flags;
  13
  14 // Long options that have no corresponding short option.
  15 enum LongOption {
  16         OPTION_HELP = 1000,
  17         OPTION_SLOW_DOWN_INPUT = 1001,
  18         OPTION_HTTP_PORT = 1002
  19 };
  20
  21 void usage()
  22 {
  23         fprintf(stderr, "Usage: futatabi [OPTION]... SOURCE_URL\n");
  24         fprintf(stderr, "\n");
  25         fprintf(stderr, "      --help                      print usage information\n");
  26         fprintf(stderr, "  -w, --width                     output width in pixels (default 1280)\n");
  27         fprintf(stderr, "  -h, --height                    output height in pixels (default 720)\n");
  28         fprintf(stderr, "  -r, --frame-rate NUM[/NUM]      output frame rate, as a float or fraction\n");
  29         fprintf(stderr, "                                    (default 60000/1001 ~= 59.94)\n");
  30         fprintf(stderr, "      --slow-down-input           slow down input to realtime (default on if no\n");
  31         fprintf(stderr, "                                    source URL given)\n");
  32         fprintf(stderr, "  -q, --interpolation-quality N   0 = off\n");
  33         fprintf(stderr, "                                  1 = fastest\n");
  34         fprintf(stderr, "                                  2 = default (realtime 720p on fast embedded GPUs)\n");
  35         fprintf(stderr, "                                  3 = good (realtime 720p on GTX 970 or so)\n");
  36         fprintf(stderr, "                                  4 = best (not realtime on any current GPU)\n");
  37         fprintf(stderr, "  -d, --working-directory DIR     where to store frames and database\n");
  38         fprintf(stderr, "      --http-port PORT            which port to listen on for output\n");
  39 }
  40
  41 void parse_flags(int argc, char * const argv[])
  42 {
  43         static const option long_options[] = {
  44                 { "help", no_argument, 0, OPTION_HELP },
  45                 { "width", required_argument, 0, 'w' },
  46                 { "height", required_argument, 0, 'h' },
  47                 { "frame-rate", required_argument, 0, 'r' },
  48                 { "slow-down-input", no_argument, 0, OPTION_SLOW_DOWN_INPUT },
  49                 { "interpolation-quality", required_argument, 0, 'q' },
  50                 { "working-directory", required_argument, 0, 'd' },
  51                 { "http-port", required_argument, 0, OPTION_HTTP_PORT },
  52                 { 0, 0, 0, 0 }
  53         };
  54         for ( ;; ) {
  55                 int option_index = 0;
  56                 int c = getopt_long(argc, argv, "w:h:r:q:d:", long_options, &option_index);
  57
  58                 if (c == -1) {
  59                         break;
  60                 }
  61                 switch (c) {
  62                 case 'w':
  63                         global_flags.width = atoi(optarg);
  64                         break;
  65                 case 'h':
  66                         global_flags.height = atoi(optarg);
  67                         break;
  68                 case 'r': {
  69                         double num, den;
  70                         if (sscanf(optarg, "%lf/%lf", &num, &den) == 2) {
  71                                 global_flags.output_framerate = num / den;
  72                         } else if (sscanf(optarg, "%lf", &num) == 1) {
  73                                 global_flags.output_framerate = num;
  74                         } else {
  75                                 fprintf(stderr, "Invalid frame rate given (must be on the form N or N/M)\n");
  76                                 exit(1);
  77                         }
  78                         break;
  79                 }
  80                 case OPTION_SLOW_DOWN_INPUT:
  81                         global_flags.slow_down_input = true;
  82                         break;
  83                 case 'q':
  84                         global_flags.interpolation_quality = atoi(optarg);
  85                         break;
  86                 case 'd':
  87                         global_flags.working_directory = optarg;
  88                         break;
  89                 case OPTION_HTTP_PORT:
  90                         global_flags.http_port = atoi(optarg);
  91                         break;
  92                 case OPTION_HELP:
  93                         usage();
  94                         exit(0);
  95                 default:
  96                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
  97                         fprintf(stderr, "\n");
  98                         usage();
  99                         exit(1);
 100                 }
 101         }
 102
 103         if (global_flags.interpolation_quality < 0 || global_flags.interpolation_quality > 4) {
 104                 fprintf(stderr, "Interpolation quality must be 0, 1, 2, 3 or 4.\n");
 105                 usage();
 106                 exit(1);
 107         }
 108 }