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Add support for USB HID keyboard over AOAv2

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This provides a better input experience, by simulating a physical
keyboard. It converts SDL keyboard events to proper HID events, and send
them over AOAv2.

This is a rewriting and bugfix of the origin code from @amosbird:
<https://github.com/Genymobile/scrcpy/issues/279#issuecomment-453819354>

The feature is enabled the command line option -K or --hid-keyboard,
and is only available on Linux, over USB.

Refs <https://source.android.com/devices/accessories/aoa2#hid-support>
Refs <https://www.usb.org/sites/default/files/hid1_11.pdf>

PR #2632 <https://github.com/Genymobile/scrcpy/pull/2632>

Signed-off-by: Romain Vimont <rom@rom1v.com>
This commit is contained in:
Alynx Zhou
2021-09-10 18:57:35 +08:00
committed by Romain Vimont
parent f7d1efdf1d
commit 207082977a
11 changed files with 939 additions and 11 deletions
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14
app/src/cli.c
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@@ -76,6 +76,14 @@ scrcpy_print_usage(const char *arg0) {
" -f, --fullscreen\n"
" Start in fullscreen.\n"
"\n"
" -K, --hid-keyboard\n"
" Simulate a physical keyboard by using HID over AOAv2.\n"
" It provides a better experience for IME users, and allows to\n"
" generate non-ASCII characters, contrary to the default\n"
" injection method.\n"
" It may only work over USB, and is currently only supported\n"
" on Linux.\n"
"\n"
" -h, --help\n"
" Print this help.\n"
"\n"
@@ -738,6 +746,7 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
OPT_FORWARD_ALL_CLICKS},
{"fullscreen", no_argument, NULL, 'f'},
{"help", no_argument, NULL, 'h'},
{"hid-keyboard", no_argument, NULL, 'K'},
{"legacy-paste", no_argument, NULL, OPT_LEGACY_PASTE},
{"lock-video-orientation", optional_argument, NULL,
OPT_LOCK_VIDEO_ORIENTATION},
@@ -784,7 +793,7 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
optind = 0; // reset to start from the first argument in tests
int c;
while ((c = getopt_long(argc, argv, "b:c:fF:hm:nNp:r:s:StTvV:w",
while ((c = getopt_long(argc, argv, "b:c:fF:hKm:nNp:r:s:StTvV:w",
long_options, NULL)) != -1) {
switch (c) {
case 'b':
@@ -817,6 +826,9 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
case 'h':
args->help = true;
break;
case 'K':
opts->keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_HID;
break;
case OPT_MAX_FPS:
if (!parse_max_fps(optarg, &opts->max_fps)) {
return false;