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Add support for v4l2loopback

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It allows to send the video stream to /dev/videoN, so that it can be
captured (like a webcam) by any v4l2-capable tool.

PR #2232 <https://github.com/Genymobile/scrcpy/pull/2232>
PR #2233 <https://github.com/Genymobile/scrcpy/pull/2233>
PR #2268 <https://github.com/Genymobile/scrcpy/pull/2268>

Co-authored-by: Romain Vimont <rom@rom1v.com>
This commit is contained in:
Marco Martinelli
2021-04-04 00:10:44 +02:00
committed by Romain Vimont
parent 5af9d0ee0f
commit d39161f753
9 changed files with 480 additions and 2 deletions
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31
app/src/cli.c
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@@ -176,6 +176,13 @@ scrcpy_print_usage(const char *arg0) {
" on exit.\n"
" It only shows physical touches (not clicks from scrcpy).\n"
"\n"
#ifdef HAVE_V4L2
" --v4l2_sink /dev/videoN\n"
" Output to v4l2loopback device.\n"
" It requires to lock the video orientation (see\n"
" --lock-video-orientation).\n"
"\n"
#endif
" -V, --verbosity value\n"
" Set the log level (debug, info, warn or error).\n"
#ifndef NDEBUG
@@ -676,6 +683,7 @@ guess_record_format(const char *filename) {
#define OPT_LEGACY_PASTE 1024
#define OPT_ENCODER_NAME 1025
#define OPT_POWER_OFF_ON_CLOSE 1026
#define OPT_V4L2_SINK 1027
bool
scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
@@ -717,6 +725,9 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
{"show-touches", no_argument, NULL, 't'},
{"stay-awake", no_argument, NULL, 'w'},
{"turn-screen-off", no_argument, NULL, 'S'},
#ifdef HAVE_V4L2
{"v4l2_sink", required_argument, NULL, OPT_V4L2_SINK},
#endif
{"verbosity", required_argument, NULL, 'V'},
{"version", no_argument, NULL, 'v'},
{"window-title", required_argument, NULL, OPT_WINDOW_TITLE},
@@ -901,16 +912,36 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
case OPT_POWER_OFF_ON_CLOSE:
opts->power_off_on_close = true;
break;
#ifdef HAVE_V4L2
case OPT_V4L2_SINK:
opts->v4l2_device = optarg;
break;
#endif
default:
// getopt prints the error message on stderr
return false;
}
}
#ifdef HAVE_V4L2
if (!opts->display && !opts->record_filename && !opts->v4l2_device) {
LOGE("-N/--no-display requires either screen recording (-r/--record)"
" or sink to v4l2loopback device (--v4l2_sink)");
return false;
}
if (opts->v4l2_device && opts->lock_video_orientation
== SC_LOCK_VIDEO_ORIENTATION_UNLOCKED) {
LOGI("Video orientation is locked for v4l2 sink. "
"See --lock-video-orientation.");
opts->lock_video_orientation = SC_LOCK_VIDEO_ORIENTATION_INITIAL;
}
#else
if (!opts->display && !opts->record_filename) {
LOGE("-N/--no-display requires screen recording (-r/--record)");
return false;
}
#endif
int index = optind;
if (index < argc) {