git.sesse.net Git - nageru/blob - nageru/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_FULLSCREEN,
  18         OPTION_MAX_NUM_CARDS,
  19         OPTION_MULTICHANNEL,
  20         OPTION_MIDI_MAPPING,
  21         OPTION_DEFAULT_HDMI_INPUT,
  22         OPTION_FAKE_CARDS_AUDIO,
  23         OPTION_V4L_OUTPUT,
  24         OPTION_HTTP_UNCOMPRESSED_VIDEO,
  25         OPTION_HTTP_X264_VIDEO,
  26         OPTION_RECORD_X264_VIDEO,
  27         OPTION_X264_PRESET,
  28         OPTION_X264_TUNE,
  29         OPTION_X264_SPEEDCONTROL,
  30         OPTION_X264_SPEEDCONTROL_VERBOSE,
  31         OPTION_X264_BITRATE,
  32         OPTION_X264_CRF,
  33         OPTION_X264_VBV_BUFSIZE,
  34         OPTION_X264_VBV_MAX_BITRATE,
  35         OPTION_X264_PARAM,
  36         OPTION_HTTP_MUX,
  37         OPTION_HTTP_COARSE_TIMEBASE,
  38         OPTION_HTTP_AUDIO_CODEC,
  39         OPTION_HTTP_AUDIO_BITRATE,
  40         OPTION_HTTP_PORT,
  41         OPTION_SRT_PORT,
  42         OPTION_NO_SRT,
  43         OPTION_NO_TRANSCODE_AUDIO,
  44         OPTION_DISABLE_AUDIO,
  45         OPTION_FLAT_AUDIO,
  46         OPTION_GAIN_STAGING,
  47         OPTION_DISABLE_LOCUT,
  48         OPTION_ENABLE_LOCUT,
  49         OPTION_DISABLE_GAIN_STAGING_AUTO,
  50         OPTION_ENABLE_GAIN_STAGING_AUTO,
  51         OPTION_DISABLE_COMPRESSOR,
  52         OPTION_ENABLE_COMPRESSOR,
  53         OPTION_DISABLE_LIMITER,
  54         OPTION_ENABLE_LIMITER,
  55         OPTION_DISABLE_MAKEUP_GAIN_AUTO,
  56         OPTION_ENABLE_MAKEUP_GAIN_AUTO,
  57         OPTION_DISABLE_ALSA_OUTPUT,
  58         OPTION_NO_FLUSH_PBOS,
  59         OPTION_PRINT_VIDEO_LATENCY,
  60         OPTION_MAX_INPUT_QUEUE_FRAMES,
  61         OPTION_AUDIO_QUEUE_LENGTH_MS,
  62         OPTION_OUTPUT_YCBCR_COEFFICIENTS,
  63         OPTION_OUTPUT_BUFFER_FRAMES,
  64         OPTION_OUTPUT_SLOP_FRAMES,
  65         OPTION_TIMECODE_STREAM,
  66         OPTION_TIMECODE_STDOUT,
  67         OPTION_QUICK_CUT_KEYS,
  68         OPTION_10_BIT_INPUT,
  69         OPTION_10_BIT_OUTPUT,
  70         OPTION_INPUT_YCBCR_INTERPRETATION,
  71         OPTION_MJPEG_EXPORT_CARDS,
  72 };
  73
  74 map<unsigned, unsigned> parse_mjpeg_export_cards(char *optarg)
  75 {
  76         map<unsigned, unsigned> ret;
  77         if (optarg[0] == '\0') {
  78                 return ret;
  79         }
  80
  81         unsigned stream_idx = 0;
  82         char *start = optarg;
  83         for ( ;; ) {
  84                 char *end = strchr(start, ',');
  85                 if (end != nullptr) {
  86                         *end = '\0';
  87                 }
  88
  89                 unsigned range_begin, range_end;
  90                 if (sscanf(start, "%u-%u", &range_begin, &range_end) != 2) {
  91                         range_begin = range_end = atoi(start);
  92                 }
  93                 if (range_end < range_begin) {
  94                         fprintf(stderr, "ERROR: Invalid range %u-%u in --mjpeg-export-cards=\n", range_begin, range_end);
  95                         exit(1);
  96                 }
  97                 if (range_end >= unsigned(global_flags.max_num_cards)) {
  98                         // There are situations where we could possibly want to
  99                         // include FFmpeg inputs (CEF inputs are unlikely),
 100                         // but they're not necessarily in 4:2:2 Y'CbCr, so it would
 101                         // require more functionality the the JPEG encoder.
 102                         fprintf(stderr, "ERROR: Asked for (zero-indexed) card %u in --mjpeg-export-cards=, but there are only %u cards\n",
 103                                 range_end, global_flags.max_num_cards);
 104                         exit(1);
 105                 }
 106                 for (unsigned card_idx = range_begin; card_idx <= range_end; ++card_idx) {
 107                         if (ret.count(card_idx)) {
 108                                 fprintf(stderr, "ERROR: Card %u was given twice in --mjpeg-export-cards=\n", card_idx);
 109                                 exit(1);
 110                         }
 111                         ret[card_idx] = stream_idx++;
 112                 }
 113                 if (end == nullptr) {
 114                         break;
 115                 } else {
 116                         start = end + 1;
 117                 }
 118         }
 119         return ret;
 120 }
 121
 122 void usage(Program program)
 123 {
 124         if (program == PROGRAM_KAERU) {
 125                 fprintf(stderr, "Usage: kaeru [OPTION]... SOURCE_URL\n");
 126         } else {
 127                 fprintf(stderr, "Usage: nageru [OPTION]...\n");
 128         }
 129         fprintf(stderr, "\n");
 130         fprintf(stderr, "      --help                      print usage information\n");
 131         if (program == PROGRAM_NAGERU) {
 132                 fprintf(stderr, "      --fullscreen                run in full screen, with no decorations\n");
 133         }
 134         fprintf(stderr, "  -w, --width                     output width in pixels (default 1280)\n");
 135         fprintf(stderr, "  -h, --height                    output height in pixels (default 720)\n");
 136         if (program == PROGRAM_NAGERU) {
 137                 fprintf(stderr, "  -c, --num-cards                 set minimum number of input cards (default 2)\n");
 138                 fprintf(stderr, "      --max-num-cards             set maximum number of input cards (default %d)\n", MAX_VIDEO_CARDS);
 139                 fprintf(stderr, "  -o, --output-card=CARD          also output signal to the given card (default none)\n");
 140                 fprintf(stderr, "  -t, --theme=FILE                choose theme (default theme.lua)\n");
 141                 fprintf(stderr, "  -I, --theme-dir=DIR             search for theme in this directory (can be given multiple times)\n");
 142                 fprintf(stderr, "  -r, --recording-dir=DIR         where to store disk recording\n");
 143                 fprintf(stderr, "  -v, --va-display=SPEC           VA-API device for H.264 encoding\n");
 144                 fprintf(stderr, "                                    ($DISPLAY spec or /dev/dri/render* path)\n");
 145                 fprintf(stderr, "  -m, --map-signal=SIGNAL,CARD    set a default card mapping (can be given multiple times)\n");
 146                 fprintf(stderr, "  -M, --input-mapping=FILE        start with the given audio input mapping (implies --multichannel)\n");
 147                 fprintf(stderr, "      --multichannel              start in multichannel audio mapping mode\n");
 148                 fprintf(stderr, "      --midi-mapping=FILE         start with the given MIDI controller mapping (implies --multichannel)\n");
 149                 fprintf(stderr, "      --default-hdmi-input        default to HDMI over SDI inputs for cards that have both\n");
 150                 fprintf(stderr, "      --fake-cards-audio          make fake (disconnected) cards output a simple tone\n");
 151                 fprintf(stderr, "      --v4l-output DEVICE         send video (no audio) to V4L2 output/loopback\n");
 152                 fprintf(stderr, "      --http-uncompressed-video   send uncompressed NV12 video to HTTP clients\n");
 153                 fprintf(stderr, "      --http-x264-video           send x264-compressed video to HTTP clients\n");
 154                 fprintf(stderr, "      --record-x264-video         store x264-compressed video to disk (implies --http-x264-video,\n");
 155                 fprintf(stderr, "                                    removes the need for working VA-API encoding)\n");
 156         }
 157         fprintf(stderr, "      --x264-preset               x264 quality preset (default " X264_DEFAULT_PRESET ")\n");
 158         fprintf(stderr, "      --x264-tune                 x264 tuning (default " X264_DEFAULT_TUNE ", can be blank)\n");
 159         fprintf(stderr, "      --x264-speedcontrol         try to match x264 preset to available CPU speed\n");
 160         fprintf(stderr, "      --x264-speedcontrol-verbose  output speedcontrol debugging statistics\n");
 161         fprintf(stderr, "      --x264-bitrate              x264 bitrate (in kilobit/sec, default %d)\n",
 162                 DEFAULT_X264_OUTPUT_BIT_RATE);
 163         fprintf(stderr, "      --x264-crf=VALUE            quality-based VBR (-12 to 51), incompatible with --x264-bitrate and VBV\n");
 164         fprintf(stderr, "      --x264-vbv-bufsize          x264 VBV size (in kilobits, 0 = one-frame VBV,\n");
 165         fprintf(stderr, "                                  default: same as --x264-bitrate, that is, one-second VBV)\n");
 166         fprintf(stderr, "      --x264-vbv-max-bitrate      x264 local max bitrate (in kilobit/sec per --vbv-bufsize,\n");
 167         fprintf(stderr, "                                  0 = no limit, default: same as --x264-bitrate, i.e., CBR)\n");
 168         fprintf(stderr, "      --x264-param=NAME[,VALUE]   set any x264 parameter, for fine tuning\n");
 169         fprintf(stderr, "      --http-mux=NAME             mux to use for HTTP streams (default " DEFAULT_STREAM_MUX_NAME ")\n");
 170         fprintf(stderr, "      --http-audio-codec=NAME     audio codec to use for HTTP streams\n");
 171         fprintf(stderr, "                                  (default is to use the same as for the recording)\n");
 172         fprintf(stderr, "      --http-audio-bitrate=KBITS  audio codec bit rate to use for HTTP streams\n");
 173         fprintf(stderr, "                                  (default is %d, ignored unless --http-audio-codec is set)\n",
 174                 DEFAULT_AUDIO_OUTPUT_BIT_RATE / 1000);
 175         fprintf(stderr, "      --http-port=PORT            which port to use for the built-in HTTP server\n");
 176         fprintf(stderr, "                                  (default is %d)\n", DEFAULT_HTTPD_PORT);
 177         fprintf(stderr, "      --srt-port=PORT             which port to use for receiving SRT streams\n");
 178         fprintf(stderr, "                                  (default is %d)\n", DEFAULT_SRT_PORT);
 179         fprintf(stderr, "      --no-srt                    disable receiving SRT streams\n");
 180         if (program == PROGRAM_KAERU) {
 181                 fprintf(stderr, "      --no-transcode-audio        copy encoded audio raw from the source stream\n");
 182                 fprintf(stderr, "                                    (requires --http-audio-codec= to be set)\n");
 183                 fprintf(stderr, "      --disable-audio             do not include any audio in the stream\n");
 184         }
 185         if (program == PROGRAM_NAGERU) {
 186                 fprintf(stderr, "      --flat-audio                start with most audio processing turned off\n");
 187                 fprintf(stderr, "                                    (can be overridden by e.g. --enable-limiter)\n");
 188                 fprintf(stderr, "      --gain-staging=DB           set initial gain staging to the given value\n");
 189                 fprintf(stderr, "                                    (--disable-gain-staging-auto)\n");
 190                 fprintf(stderr, "      --disable-locut             turn off locut filter (also --enable)\n");
 191                 fprintf(stderr, "      --disable-gain-staging-auto  turn off automatic gain staging (also --enable)\n");
 192                 fprintf(stderr, "      --disable-compressor        turn off regular compressor (also --enable)\n");
 193                 fprintf(stderr, "      --disable-limiter           turn off limiter (also --enable)\n");
 194                 fprintf(stderr, "      --disable-makeup-gain-auto  turn off auto-adjustment of final makeup gain (also --enable)\n");
 195                 fprintf(stderr, "      --disable-alsa-output       disable audio monitoring via ALSA\n");
 196                 fprintf(stderr, "      --no-flush-pbos             do not explicitly signal texture data uploads\n");
 197                 fprintf(stderr, "                                    (will give display corruption, but makes it\n");
 198                 fprintf(stderr, "                                    possible to run with apitrace in real time)\n");
 199                 fprintf(stderr, "      --print-video-latency       print out measurements of video latency on stdout\n");
 200                 fprintf(stderr, "      --max-input-queue-frames=FRAMES  never keep more than FRAMES frames for each card\n");
 201                 fprintf(stderr, "                                    (default 6, minimum 1)\n");
 202                 fprintf(stderr, "      --audio-queue-length-ms=MS  length of audio resampling queue (default 100.0)\n");
 203                 fprintf(stderr, "      --output-ycbcr-coefficients={rec601,rec709,auto}\n");
 204                 fprintf(stderr, "                                  Y'CbCr coefficient standard of output (default auto)\n");
 205                 fprintf(stderr, "                                    auto is rec601, unless --output-card is used\n");
 206                 fprintf(stderr, "                                    and a Rec. 709 mode (typically HD modes) is in use\n");
 207                 fprintf(stderr, "      --output-buffer-frames=NUM  number of frames in output buffer for --output-card,\n");
 208                 fprintf(stderr, "                                    can be fractional (default 6.0); note also\n");
 209                 fprintf(stderr, "                                    the audio queue can't be much longer than this\n");
 210                 fprintf(stderr, "      --output-slop-frames=NUM    if more less than this number of frames behind for\n");
 211                 fprintf(stderr, "                                    --output-card, try to submit anyway instead of\n");
 212                 fprintf(stderr, "                                    dropping the frame (default 0.5)\n");
 213                 fprintf(stderr, "      --timecode-stream           show timestamp and timecode in stream\n");
 214                 fprintf(stderr, "      --timecode-stdout           show timestamp and timecode on standard output\n");
 215                 fprintf(stderr, "      --quick-cut-keys            enable direct cutting by Q, W, E, ... keys\n");
 216                 fprintf(stderr, "      --10-bit-input              use 10-bit video input (requires compute shaders)\n");
 217                 fprintf(stderr, "      --10-bit-output             use 10-bit video output (requires compute shaders,\n");
 218                 fprintf(stderr, "                                    implies --record-x264-video)\n");
 219                 fprintf(stderr, "      --input-ycbcr-interpretation=CARD,{rec601,rec709,auto}[,{limited,full}]\n");
 220                 fprintf(stderr, "                                  Y'CbCr coefficient standard of card CARD (default auto)\n");
 221                 fprintf(stderr, "                                    auto is rec601 for SD, rec709 for HD, always limited\n");
 222                 fprintf(stderr, "                                    limited means standard 0-240/0-235 input range (for 8-bit)\n");
 223                 fprintf(stderr, "      --mjpeg-export-cards=RANGE[,RANGE...]\n");
 224                 fprintf(stderr, "                                  export the given cards in MJPEG format to /multicam.mp4,\n");
 225                 fprintf(stderr, "                                    in the given order (ranges can be either single card indexes\n");
 226                 fprintf(stderr, "                                    or pairs like 1-3 for camera 1,2,3; default is all cards)\n");
 227         }
 228 }
 229
 230 void parse_flags(Program program, int argc, char * const argv[])
 231 {
 232         static const option long_options[] = {
 233                 { "help", no_argument, 0, OPTION_HELP },
 234                 { "fullscreen", no_argument, 0, OPTION_FULLSCREEN },
 235                 { "width", required_argument, 0, 'w' },
 236                 { "height", required_argument, 0, 'h' },
 237                 { "num-cards", required_argument, 0, 'c' },
 238                 { "max-num-cards", required_argument, 0, OPTION_MAX_NUM_CARDS },
 239                 { "output-card", required_argument, 0, 'o' },
 240                 { "theme", required_argument, 0, 't' },
 241                 { "theme-dir", required_argument, 0, 'I' },
 242                 { "recording-dir", required_argument, 0, 'r' },
 243                 { "map-signal", required_argument, 0, 'm' },
 244                 { "input-mapping", required_argument, 0, 'M' },
 245                 { "va-display", required_argument, 0, 'v' },
 246                 { "multichannel", no_argument, 0, OPTION_MULTICHANNEL },
 247                 { "midi-mapping", required_argument, 0, OPTION_MIDI_MAPPING },
 248                 { "default-hdmi-input", no_argument, 0, OPTION_DEFAULT_HDMI_INPUT },
 249                 { "fake-cards-audio", no_argument, 0, OPTION_FAKE_CARDS_AUDIO },
 250                 { "v4l-output", required_argument, 0, OPTION_V4L_OUTPUT },
 251                 { "http-uncompressed-video", no_argument, 0, OPTION_HTTP_UNCOMPRESSED_VIDEO },
 252                 { "http-x264-video", no_argument, 0, OPTION_HTTP_X264_VIDEO },
 253                 { "record-x264-video", no_argument, 0, OPTION_RECORD_X264_VIDEO },
 254                 { "x264-preset", required_argument, 0, OPTION_X264_PRESET },
 255                 { "x264-tune", required_argument, 0, OPTION_X264_TUNE },
 256                 { "x264-speedcontrol", no_argument, 0, OPTION_X264_SPEEDCONTROL },
 257                 { "x264-speedcontrol-verbose", no_argument, 0, OPTION_X264_SPEEDCONTROL_VERBOSE },
 258                 { "x264-bitrate", required_argument, 0, OPTION_X264_BITRATE },
 259                 { "x264-crf", required_argument, 0, OPTION_X264_CRF },
 260                 { "x264-vbv-bufsize", required_argument, 0, OPTION_X264_VBV_BUFSIZE },
 261                 { "x264-vbv-max-bitrate", required_argument, 0, OPTION_X264_VBV_MAX_BITRATE },
 262                 { "x264-param", required_argument, 0, OPTION_X264_PARAM },
 263                 { "http-mux", required_argument, 0, OPTION_HTTP_MUX },
 264                 { "http-audio-codec", required_argument, 0, OPTION_HTTP_AUDIO_CODEC },
 265                 { "http-audio-bitrate", required_argument, 0, OPTION_HTTP_AUDIO_BITRATE },
 266                 { "http-port", required_argument, 0, OPTION_HTTP_PORT },
 267                 { "srt-port", required_argument, 0, OPTION_SRT_PORT },
 268                 { "no-srt", no_argument, 0, OPTION_NO_SRT },
 269                 { "no-transcode-audio", no_argument, 0, OPTION_NO_TRANSCODE_AUDIO },
 270                 { "disable-audio", no_argument, 0, OPTION_DISABLE_AUDIO },
 271                 { "flat-audio", no_argument, 0, OPTION_FLAT_AUDIO },
 272                 { "gain-staging", required_argument, 0, OPTION_GAIN_STAGING },
 273                 { "disable-locut", no_argument, 0, OPTION_DISABLE_LOCUT },
 274                 { "enable-locut", no_argument, 0, OPTION_ENABLE_LOCUT },
 275                 { "disable-gain-staging-auto", no_argument, 0, OPTION_DISABLE_GAIN_STAGING_AUTO },
 276                 { "enable-gain-staging-auto", no_argument, 0, OPTION_ENABLE_GAIN_STAGING_AUTO },
 277                 { "disable-compressor", no_argument, 0, OPTION_DISABLE_COMPRESSOR },
 278                 { "enable-compressor", no_argument, 0, OPTION_ENABLE_COMPRESSOR },
 279                 { "disable-limiter", no_argument, 0, OPTION_DISABLE_LIMITER },
 280                 { "enable-limiter", no_argument, 0, OPTION_ENABLE_LIMITER },
 281                 { "disable-makeup-gain-auto", no_argument, 0, OPTION_DISABLE_MAKEUP_GAIN_AUTO },
 282                 { "enable-makeup-gain-auto", no_argument, 0, OPTION_ENABLE_MAKEUP_GAIN_AUTO },
 283                 { "disable-alsa-output", no_argument, 0, OPTION_DISABLE_ALSA_OUTPUT },
 284                 { "no-flush-pbos", no_argument, 0, OPTION_NO_FLUSH_PBOS },
 285                 { "print-video-latency", no_argument, 0, OPTION_PRINT_VIDEO_LATENCY },
 286                 { "max-input-queue-frames", required_argument, 0, OPTION_MAX_INPUT_QUEUE_FRAMES },
 287                 { "audio-queue-length-ms", required_argument, 0, OPTION_AUDIO_QUEUE_LENGTH_MS },
 288                 { "output-ycbcr-coefficients", required_argument, 0, OPTION_OUTPUT_YCBCR_COEFFICIENTS },
 289                 { "output-buffer-frames", required_argument, 0, OPTION_OUTPUT_BUFFER_FRAMES },
 290                 { "output-slop-frames", required_argument, 0, OPTION_OUTPUT_SLOP_FRAMES },
 291                 { "timecode-stream", no_argument, 0, OPTION_TIMECODE_STREAM },
 292                 { "timecode-stdout", no_argument, 0, OPTION_TIMECODE_STDOUT },
 293                 { "quick-cut-keys", no_argument, 0, OPTION_QUICK_CUT_KEYS },
 294                 { "10-bit-input", no_argument, 0, OPTION_10_BIT_INPUT },
 295                 { "10-bit-output", no_argument, 0, OPTION_10_BIT_OUTPUT },
 296                 { "input-ycbcr-interpretation", required_argument, 0, OPTION_INPUT_YCBCR_INTERPRETATION },
 297                 { "mjpeg-export-cards", required_argument, 0, OPTION_MJPEG_EXPORT_CARDS },
 298                 { 0, 0, 0, 0 }
 299         };
 300         vector<string> theme_dirs;
 301         string output_ycbcr_coefficients = "auto";
 302         bool card_to_mjpeg_stream_export_set = false;
 303         for ( ;; ) {
 304                 int option_index = 0;
 305                 int c = getopt_long(argc, argv, "c:o:t:I:r:v:m:M:w:h:", long_options, &option_index);
 306
 307                 if (c == -1) {
 308                         break;
 309                 }
 310                 switch (c) {
 311                 case 'w':
 312                         global_flags.width = atoi(optarg);
 313                         break;
 314                 case 'h':
 315                         global_flags.height = atoi(optarg);
 316                         break;
 317                 case 'c':
 318                         global_flags.min_num_cards = atoi(optarg);
 319                         break;
 320                 case OPTION_MAX_NUM_CARDS:
 321                         global_flags.max_num_cards = atoi(optarg);
 322                         break;
 323                 case 'o':
 324                         global_flags.output_card = atoi(optarg);
 325                         break;
 326                 case 't':
 327                         global_flags.theme_filename = optarg;
 328                         break;
 329                 case 'I':
 330                         theme_dirs.push_back(optarg);
 331                         break;
 332                 case 'r':
 333                         global_flags.recording_dir = optarg;
 334                         break;
 335                 case 'm': {
 336                         char *ptr = strchr(optarg, ',');
 337                         if (ptr == nullptr) {
 338                                 fprintf(stderr, "ERROR: Invalid argument '%s' to --map-signal (needs a signal and a card number, separated by comma)\n", optarg);
 339                                 exit(1);
 340                         }
 341                         *ptr = '\0';
 342                         const int signal_num = atoi(optarg);
 343                         const int card_num = atoi(ptr + 1);
 344                         if (global_flags.default_stream_mapping.count(signal_num)) {
 345                                 fprintf(stderr, "ERROR: Signal %d already mapped to card %d\n",
 346                                         signal_num, global_flags.default_stream_mapping[signal_num]);
 347                                 exit(1);
 348                         }
 349                         global_flags.default_stream_mapping[signal_num] = card_num;
 350                         break;
 351                 }
 352                 case 'M':
 353                         global_flags.input_mapping_filename = optarg;
 354                         break;
 355                 case OPTION_MULTICHANNEL:
 356                         global_flags.multichannel_mapping_mode = true;
 357                         break;
 358                 case 'v':
 359                         global_flags.va_display = optarg;
 360                         break;
 361                 case OPTION_MIDI_MAPPING:
 362                         global_flags.midi_mapping_filename = optarg;
 363                         global_flags.multichannel_mapping_mode = true;
 364                         break;
 365                 case OPTION_DEFAULT_HDMI_INPUT:
 366                         global_flags.default_hdmi_input = true;
 367                         break;
 368                 case OPTION_FAKE_CARDS_AUDIO:
 369                         global_flags.fake_cards_audio = true;
 370                         break;
 371                 case OPTION_V4L_OUTPUT:
 372                         global_flags.v4l_output_device = optarg;
 373                         break;
 374                 case OPTION_HTTP_UNCOMPRESSED_VIDEO:
 375                         global_flags.uncompressed_video_to_http = true;
 376                         break;
 377                 case OPTION_HTTP_MUX:
 378                         global_flags.stream_mux_name = optarg;
 379                         break;
 380                 case OPTION_HTTP_AUDIO_CODEC:
 381                         global_flags.stream_audio_codec_name = optarg;
 382                         break;
 383                 case OPTION_HTTP_AUDIO_BITRATE:
 384                         global_flags.stream_audio_codec_bitrate = atoi(optarg) * 1000;
 385                         break;
 386                 case OPTION_HTTP_PORT:
 387                         global_flags.http_port = atoi(optarg);
 388                         break;
 389                 case OPTION_SRT_PORT:
 390                         global_flags.srt_port = atoi(optarg);
 391                         break;
 392                 case OPTION_NO_SRT:
 393                         global_flags.srt_port = -1;
 394                         break;
 395                 case OPTION_NO_TRANSCODE_AUDIO:
 396                         global_flags.transcode_audio = false;
 397                         break;
 398                 case OPTION_DISABLE_AUDIO:
 399                         global_flags.transcode_audio = false;
 400                         global_flags.enable_audio = false;
 401                         break;
 402                 case OPTION_HTTP_X264_VIDEO:
 403                         global_flags.x264_video_to_http = true;
 404                         break;
 405                 case OPTION_RECORD_X264_VIDEO:
 406                         global_flags.x264_video_to_disk = true;
 407                         global_flags.x264_video_to_http = true;
 408                         break;
 409                 case OPTION_X264_PRESET:
 410                         global_flags.x264_preset = optarg;
 411                         break;
 412                 case OPTION_X264_TUNE:
 413                         global_flags.x264_tune = optarg;
 414                         break;
 415                 case OPTION_X264_SPEEDCONTROL:
 416                         global_flags.x264_speedcontrol = true;
 417                         break;
 418                 case OPTION_X264_SPEEDCONTROL_VERBOSE:
 419                         global_flags.x264_speedcontrol_verbose = true;
 420                         break;
 421                 case OPTION_X264_BITRATE:
 422                         global_flags.x264_bitrate = atoi(optarg);
 423                         break;
 424                 case OPTION_X264_CRF:
 425                         global_flags.x264_crf = atof(optarg);
 426                         break;
 427                 case OPTION_X264_VBV_BUFSIZE:
 428                         global_flags.x264_vbv_buffer_size = atoi(optarg);
 429                         break;
 430                 case OPTION_X264_VBV_MAX_BITRATE:
 431                         global_flags.x264_vbv_max_bitrate = atoi(optarg);
 432                         break;
 433                 case OPTION_X264_PARAM:
 434                         global_flags.x264_extra_param.push_back(optarg);
 435                         break;
 436                 case OPTION_FLAT_AUDIO:
 437                         // If --flat-audio is given, turn off everything that messes with the sound,
 438                         // except the final makeup gain.
 439                         global_flags.locut_enabled = false;
 440                         global_flags.gain_staging_auto = false;
 441                         global_flags.compressor_enabled = false;
 442                         global_flags.limiter_enabled = false;
 443                         break;
 444                 case OPTION_GAIN_STAGING:
 445                         global_flags.initial_gain_staging_db = atof(optarg);
 446                         global_flags.gain_staging_auto = false;
 447                         break;
 448                 case OPTION_DISABLE_LOCUT:
 449                         global_flags.locut_enabled = false;
 450                         break;
 451                 case OPTION_ENABLE_LOCUT:
 452                         global_flags.locut_enabled = true;
 453                         break;
 454                 case OPTION_DISABLE_GAIN_STAGING_AUTO:
 455                         global_flags.gain_staging_auto = false;
 456                         break;
 457                 case OPTION_ENABLE_GAIN_STAGING_AUTO:
 458                         global_flags.gain_staging_auto = true;
 459                         break;
 460                 case OPTION_DISABLE_COMPRESSOR:
 461                         global_flags.compressor_enabled = false;
 462                         break;
 463                 case OPTION_ENABLE_COMPRESSOR:
 464                         global_flags.compressor_enabled = true;
 465                         break;
 466                 case OPTION_DISABLE_LIMITER:
 467                         global_flags.limiter_enabled = false;
 468                         break;
 469                 case OPTION_ENABLE_LIMITER:
 470                         global_flags.limiter_enabled = true;
 471                         break;
 472                 case OPTION_DISABLE_MAKEUP_GAIN_AUTO:
 473                         global_flags.final_makeup_gain_auto = false;
 474                         break;
 475                 case OPTION_ENABLE_MAKEUP_GAIN_AUTO:
 476                         global_flags.final_makeup_gain_auto = true;
 477                         break;
 478                 case OPTION_DISABLE_ALSA_OUTPUT:
 479                         global_flags.enable_alsa_output = false;
 480                         break;
 481                 case OPTION_NO_FLUSH_PBOS:
 482                         global_flags.flush_pbos = false;
 483                         break;
 484                 case OPTION_PRINT_VIDEO_LATENCY:
 485                         global_flags.print_video_latency = true;
 486                         break;
 487                 case OPTION_MAX_INPUT_QUEUE_FRAMES:
 488                         global_flags.max_input_queue_frames = atoi(optarg);
 489                         break;
 490                 case OPTION_AUDIO_QUEUE_LENGTH_MS:
 491                         global_flags.audio_queue_length_ms = atof(optarg);
 492                         break;
 493                 case OPTION_OUTPUT_YCBCR_COEFFICIENTS:
 494                         output_ycbcr_coefficients = optarg;
 495                         break;
 496                 case OPTION_OUTPUT_BUFFER_FRAMES:
 497                         global_flags.output_buffer_frames = atof(optarg);
 498                         break;
 499                 case OPTION_OUTPUT_SLOP_FRAMES:
 500                         global_flags.output_slop_frames = atof(optarg);
 501                         break;
 502                 case OPTION_TIMECODE_STREAM:
 503                         global_flags.display_timecode_in_stream = true;
 504                         break;
 505                 case OPTION_TIMECODE_STDOUT:
 506                         global_flags.display_timecode_on_stdout = true;
 507                         break;
 508                 case OPTION_QUICK_CUT_KEYS:
 509                         global_flags.enable_quick_cut_keys = true;
 510                         break;
 511                 case OPTION_10_BIT_INPUT:
 512                         global_flags.ten_bit_input = true;
 513                         break;
 514                 case OPTION_10_BIT_OUTPUT:
 515                         global_flags.ten_bit_output = true;
 516                         global_flags.x264_video_to_disk = true;
 517                         global_flags.x264_video_to_http = true;
 518                         global_flags.x264_bit_depth = 10;
 519                         break;
 520                 case OPTION_INPUT_YCBCR_INTERPRETATION: {
 521                         char *ptr = strchr(optarg, ',');
 522                         if (ptr == nullptr) {
 523                                 fprintf(stderr, "ERROR: Invalid argument '%s' to --input-ycbcr-interpretation (needs a card and an interpretation, separated by comma)\n", optarg);
 524                                 exit(1);
 525                         }
 526                         *ptr = '\0';
 527                         const int card_num = atoi(optarg);
 528                         if (card_num < 0 || card_num >= MAX_VIDEO_CARDS) {
 529                                 fprintf(stderr, "ERROR: Invalid card number %d\n", card_num);
 530                                 exit(1);
 531                         }
 532
 533                         YCbCrInterpretation interpretation;
 534                         char *interpretation_str = ptr + 1;
 535                         ptr = strchr(interpretation_str, ',');
 536                         if (ptr != nullptr) {
 537                                 *ptr = '\0';
 538                                 const char *range = ptr + 1;
 539                                 if (strcmp(range, "full") == 0) {
 540                                         interpretation.full_range = true;
 541                                 } else if (strcmp(range, "limited") == 0) {
 542                                         interpretation.full_range = false;
 543                                 } else {
 544                                         fprintf(stderr, "ERROR: Invalid Y'CbCr range '%s' (must be “full” or “limited”)\n", range);
 545                                         exit(1);
 546                                 }
 547                         }
 548
 549                         if (strcmp(interpretation_str, "rec601") == 0) {
 550                                 interpretation.ycbcr_coefficients_auto = false;
 551                                 interpretation.ycbcr_coefficients = movit::YCBCR_REC_601;
 552                         } else if (strcmp(interpretation_str, "rec709") == 0) {
 553                                 interpretation.ycbcr_coefficients_auto = false;
 554                                 interpretation.ycbcr_coefficients = movit::YCBCR_REC_709;
 555                         } else if (strcmp(interpretation_str, "auto") == 0) {
 556                                 interpretation.ycbcr_coefficients_auto = true;
 557                                 if (interpretation.full_range) {
 558                                         fprintf(stderr, "ERROR: Cannot use “auto” Y'CbCr coefficients with full range\n");
 559                                         exit(1);
 560                                 }
 561                         } else {
 562                                 fprintf(stderr, "ERROR: Invalid Y'CbCr coefficients '%s' (must be “rec601”, “rec709” or “auto”)\n", interpretation_str);
 563                                 exit(1);
 564                         }
 565                         global_flags.ycbcr_interpretation[card_num] = interpretation;
 566                         break;
 567                 }
 568                 case OPTION_FULLSCREEN:
 569                         global_flags.fullscreen = true;
 570                         break;
 571                 case OPTION_MJPEG_EXPORT_CARDS: {
 572                         if (card_to_mjpeg_stream_export_set) {
 573                                 fprintf(stderr, "ERROR: --mjpeg-export-cards given twice\n");
 574                                 exit(1);
 575                         }
 576                         global_flags.card_to_mjpeg_stream_export = parse_mjpeg_export_cards(optarg);
 577                         card_to_mjpeg_stream_export_set = true;
 578                         break;
 579                 }
 580                 case OPTION_HELP:
 581                         usage(program);
 582                         exit(0);
 583                 default:
 584                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 585                         fprintf(stderr, "\n");
 586                         usage(program);
 587                         exit(1);
 588                 }
 589         }
 590
 591         if (global_flags.uncompressed_video_to_http &&
 592             global_flags.x264_video_to_http) {
 593                 fprintf(stderr, "ERROR: --http-uncompressed-video and --http-x264-video are mutually incompatible\n");
 594                 exit(1);
 595         }
 596         if (global_flags.min_num_cards <= 0) {
 597                 fprintf(stderr, "ERROR: --num-cards must be at least 1\n");
 598                 exit(1);
 599         }
 600         if (global_flags.max_num_cards <= 0) {
 601                 fprintf(stderr, "ERROR: --max-num-cards must be at least 1\n");
 602                 exit(1);
 603         }
 604         if (global_flags.max_num_cards < global_flags.min_num_cards) {
 605                 fprintf(stderr, "ERROR: --max-num-cards can not be lower than --num-cards\n");
 606                 exit(1);
 607         }
 608         if (global_flags.output_card < -1 ||
 609             global_flags.output_card >= global_flags.max_num_cards) {
 610                 fprintf(stderr, "ERROR: --output-card points to a nonexistant card\n");
 611                 exit(1);
 612         }
 613         if (global_flags.enable_audio && !global_flags.transcode_audio && global_flags.stream_audio_codec_name.empty()) {
 614                 fprintf(stderr, "ERROR: If not transcoding audio, you must specify ahead-of-time what audio codec is in use\n");
 615                 fprintf(stderr, "       (using --http-audio-codec).\n");
 616                 exit(1);
 617         }
 618         if (global_flags.x264_speedcontrol) {
 619                 if (!global_flags.x264_preset.empty() && global_flags.x264_preset != "faster") {
 620                         fprintf(stderr, "WARNING: --x264-preset is overridden by --x264-speedcontrol (implicitly uses \"faster\" as base preset)\n");
 621                 }
 622                 global_flags.x264_preset = "faster";
 623         } else if (global_flags.x264_preset.empty()) {
 624                 global_flags.x264_preset = X264_DEFAULT_PRESET;
 625         }
 626         if (!theme_dirs.empty()) {
 627                 global_flags.theme_dirs = theme_dirs;
 628         }
 629
 630         // In reality, we could probably do with any even value (we subsample
 631         // by two in some places), but it's better to be on the safe side
 632         // wrt. video codecs and such. (I'd set 16 if I could, but 1080 isn't
 633         // divisible by 16.)
 634         if (global_flags.width <= 0 || (global_flags.width % 8) != 0 ||
 635             global_flags.height <= 0 || (global_flags.height % 8) != 0) {
 636                 fprintf(stderr, "ERROR: --width and --height must be positive integers divisible by 8\n");
 637                 exit(1);
 638         }
 639
 640         for (pair<int, int> mapping : global_flags.default_stream_mapping) {
 641                 if (mapping.second >= global_flags.max_num_cards) {
 642                         fprintf(stderr, "ERROR: Signal %d mapped to card %d, which doesn't exist (try adjusting --max-num-cards)\n",
 643                                 mapping.first, mapping.second);
 644                         exit(1);
 645                 }
 646         }
 647
 648         // Rec. 709 would be the sane thing to do, but it seems many players
 649         // just default to BT.601 coefficients no matter what. We _do_ set
 650         // the right flags, so that a player that works properly doesn't have
 651         // to guess, but it's frequently ignored. See discussions
 652         // in e.g. https://trac.ffmpeg.org/ticket/4978; the situation with
 653         // browsers is complicated and depends on things like hardware acceleration
 654         // (https://bugs.chromium.org/p/chromium/issues/detail?id=333619 for
 655         // extensive discussion). VLC generally fixed this as part of 3.0.0
 656         // (see e.g. https://github.com/videolan/vlc/commit/bc71288b2e38c07d6921472824b92eef1aa85f7e
 657         // and https://github.com/videolan/vlc/commit/c3fc2683a9cde1d42674ebf9935dced05733a215),
 658         // but earlier versions were pretty random.
 659         //
 660         // On the other hand, HDMI/SDI output typically requires Rec. 709 for
 661         // HD resolutions (with no way of signaling anything else), which is
 662         // a conflicting demand. In this case, we typically let the HDMI/SDI
 663         // output win if it is active, but the user can override this.
 664         if (output_ycbcr_coefficients == "auto") {
 665                 // Essentially: BT.709 if HDMI/SDI output is on, otherwise BT.601.
 666                 global_flags.ycbcr_rec709_coefficients = false;
 667                 global_flags.ycbcr_auto_coefficients = true;
 668         } else if (output_ycbcr_coefficients == "rec709") {
 669                 global_flags.ycbcr_rec709_coefficients = true;
 670                 global_flags.ycbcr_auto_coefficients = false;
 671         } else if (output_ycbcr_coefficients == "rec601") {
 672                 global_flags.ycbcr_rec709_coefficients = false;
 673                 global_flags.ycbcr_auto_coefficients = false;
 674         } else {
 675                 fprintf(stderr, "ERROR: --output-ycbcr-coefficients must be “rec601”, “rec709” or “auto”\n");
 676                 exit(1);
 677         }
 678
 679         if (global_flags.output_buffer_frames < 0.0f) {
 680                 // Actually, even zero probably won't make sense; there is some internal
 681                 // delay to the card.
 682                 fprintf(stderr, "ERROR: --output-buffer-frames can't be negative.\n");
 683                 exit(1);
 684         }
 685         if (global_flags.output_slop_frames < 0.0f) {
 686                 fprintf(stderr, "ERROR: --output-slop-frames can't be negative.\n");
 687                 exit(1);
 688         }
 689         if (global_flags.max_input_queue_frames < 1) {
 690                 fprintf(stderr, "ERROR: --max-input-queue-frames must be at least 1.\n");
 691                 exit(1);
 692         }
 693         if (global_flags.max_input_queue_frames > 10) {
 694                 fprintf(stderr, "WARNING: --max-input-queue-frames has little effect over 10.\n");
 695         }
 696
 697         if (!isinf(global_flags.x264_crf)) {  // CRF mode is selected.
 698                 if (global_flags.x264_bitrate != -1) {
 699                         fprintf(stderr, "ERROR: --x264-bitrate and --x264-crf are mutually incompatible.\n");
 700                         exit(1);
 701                 }
 702                 if (global_flags.x264_vbv_max_bitrate != -1 && global_flags.x264_vbv_buffer_size != -1) {
 703                         fprintf(stderr, "WARNING: VBV settings are ignored with --x264-crf.\n");
 704                 }
 705         } else if (global_flags.x264_bitrate == -1) {
 706                 global_flags.x264_bitrate = DEFAULT_X264_OUTPUT_BIT_RATE;
 707         }
 708
 709         if (!card_to_mjpeg_stream_export_set) {
 710                 // Fill in the default mapping (export all cards, in order).
 711                 for (unsigned card_idx = 0; card_idx < unsigned(global_flags.max_num_cards); ++card_idx) {
 712                         global_flags.card_to_mjpeg_stream_export[card_idx] = card_idx;
 713                 }
 714         }
 715 }