Document remote ADB server in README

Refs #2807 <https://github.com/Genymobile/scrcpy/pull/2807>

README.md

@@ -730,9 +730,6 @@ of <kbd>Ctrl</kbd>+<kbd>v</kbd> and <kbd>MOD</kbd>+<kbd>v</kbd> so that they
 also inject the computer clipboard text as a sequence of key events (the same
 way as <kbd>MOD</kbd>+<kbd>Shift</kbd>+<kbd>v</kbd>).
 
-To disable automatic clipboard synchronization, use
-`--no-clipboard-autosync`.
-
 #### Pinch-to-zoom
 
 To simulate "pinch-to-zoom": <kbd>Ctrl</kbd>+_click-and-move_.

app/meson.build

@@ -25,7 +25,6 @@ src = [
     'src/server.c',
     'src/stream.c',
     'src/video_buffer.c',
-    'src/util/acksync.c',
     'src/util/file.c',
     'src/util/intr.c',
     'src/util/log.c',
@@ -40,26 +39,16 @@ src = [
     'src/util/tick.c',
 ]
 
-conf = configuration_data()
-
 if host_machine.system() == 'windows'
     src += [
         'src/sys/win/file.c',
         'src/sys/win/process.c',
     ]
-    conf.set('_WIN32_WINNT', '0x0600')
-    conf.set('WINVER', '0x0600')
 else
     src += [
         'src/sys/unix/file.c',
         'src/sys/unix/process.c',
     ]
-    conf.set('_POSIX_C_SOURCE', '200809L')
-    conf.set('_XOPEN_SOURCE', '700')
-    conf.set('_GNU_SOURCE', true)
-    if host_machine.system() == 'darwin'
-        conf.set('_DARWIN_C_SOURCE', true)
-    endif
 endif
 
 v4l2_support = host_machine.system() == 'linux'
@@ -139,6 +128,8 @@ if host_machine.system() == 'windows'
     dependencies += cc.find_library('ws2_32')
 endif
 
+conf = configuration_data()
+
 foreach f : check_functions
   if cc.has_function(f)
     define = 'HAVE_' + f.underscorify().to_upper()

app/scrcpy.1

@@ -114,12 +114,6 @@ Limit both the width and height of the video to \fIvalue\fR. The other dimension
 
 Default is 0 (unlimited).
 
-.TP
-.B \-\-no\-clipboard\-autosync
-By default, scrcpy automatically synchronizes the computer clipboard to the device clipboard before injecting Ctrl+v, and the device clipboard to the computer clipboard whenever it changes.
-
-This option disables this automatic synchronization.
-
 .TP
 .B \-n, \-\-no\-control
 Disable device control (mirror the device in read\-only).

app/src/aoa_hid.c

@@ -35,7 +35,7 @@ sc_hid_event_init(struct sc_hid_event *hid_event, uint16_t accessory_id,
     hid_event->accessory_id = accessory_id;
     hid_event->buffer = buffer;
     hid_event->size = buffer_size;
-    hid_event->ack_to_wait = SC_SEQUENCE_INVALID;
+    hid_event->delay = 0;
 }
 
 void
@@ -118,10 +118,7 @@ sc_aoa_open_usb_handle(libusb_device *device, libusb_device_handle **handle) {
 }
 
 bool
-sc_aoa_init(struct sc_aoa *aoa, const char *serial,
-            struct sc_acksync *acksync) {
-    assert(acksync);
-
+sc_aoa_init(struct sc_aoa *aoa, const char *serial) {
     cbuf_init(&aoa->queue);
 
     if (!sc_mutex_init(&aoa->mutex)) {
@@ -158,7 +155,6 @@ sc_aoa_init(struct sc_aoa *aoa, const char *serial,
     }
 
     aoa->stopped = false;
-    aoa->acksync = acksync;
 
     return true;
 }
@@ -336,28 +332,23 @@ run_aoa_thread(void *data) {
         assert(non_empty);
         (void) non_empty;
 
-        uint64_t ack_to_wait = event.ack_to_wait;
-        sc_mutex_unlock(&aoa->mutex);
-
-        if (ack_to_wait != SC_SEQUENCE_INVALID) {
-            LOGD("Waiting ack from server sequence=%" PRIu64_, ack_to_wait);
-            // Do not block the loop indefinitely if the ack never comes (it should
-            // never happen)
-            sc_tick deadline = sc_tick_now() + SC_TICK_FROM_MS(500);
-            enum sc_acksync_wait_result result =
-                sc_acksync_wait(aoa->acksync, ack_to_wait, deadline);
-
-            if (result == SC_ACKSYNC_WAIT_TIMEOUT) {
-                LOGW("Ack not received after 500ms, discarding HID event");
-                sc_hid_event_destroy(&event);
-                continue;
-            } else if (result == SC_ACKSYNC_WAIT_INTR) {
-                // stopped
-                sc_hid_event_destroy(&event);
+        assert(event.delay >= 0);
+        if (event.delay) {
+            // Wait during the specified delay before injecting the HID event
+            sc_tick deadline = sc_tick_now() + event.delay;
+            bool timed_out = false;
+            while (!aoa->stopped && !timed_out) {
+                timed_out = !sc_cond_timedwait(&aoa->event_cond, &aoa->mutex,
+                                               deadline);
+            }
+            if (aoa->stopped) {
+                sc_mutex_unlock(&aoa->mutex);
                 break;
             }
         }
 
+        sc_mutex_unlock(&aoa->mutex);
+
         bool ok = sc_aoa_send_hid_event(aoa, &event);
         sc_hid_event_destroy(&event);
         if (!ok) {
@@ -386,8 +377,6 @@ sc_aoa_stop(struct sc_aoa *aoa) {
     aoa->stopped = true;
     sc_cond_signal(&aoa->event_cond);
     sc_mutex_unlock(&aoa->mutex);
-
-    sc_acksync_interrupt(aoa->acksync);
 }
 
 void

app/src/aoa_hid.h

@@ -6,7 +6,6 @@
 
 #include <libusb-1.0/libusb.h>
 
-#include "util/acksync.h"
 #include "util/cbuf.h"
 #include "util/thread.h"
 #include "util/tick.h"
@@ -15,7 +14,7 @@ struct sc_hid_event {
     uint16_t accessory_id;
     unsigned char *buffer;
     uint16_t size;
-    uint64_t ack_to_wait;
+    sc_tick delay;
 };
 
 // Takes ownership of buffer
@@ -37,12 +36,10 @@ struct sc_aoa {
     sc_cond event_cond;
     bool stopped;
     struct sc_hid_event_queue queue;
-
-    struct sc_acksync *acksync;
 };
 
 bool
-sc_aoa_init(struct sc_aoa *aoa, const char *serial, struct sc_acksync *acksync);
+sc_aoa_init(struct sc_aoa *aoa, const char *serial);
 
 void
 sc_aoa_destroy(struct sc_aoa *aoa);

app/src/cli.c

@@ -49,7 +49,6 @@
 #define OPT_V4L2_BUFFER            1029
 #define OPT_TUNNEL_HOST            1030
 #define OPT_TUNNEL_PORT            1031
-#define OPT_NO_CLIPBOARD_AUTOSYNC  1032
 
 struct sc_option {
     char shortopt;
@@ -209,15 +208,6 @@ static const struct sc_option options[] = {
                 "is preserved.\n"
                 "Default is 0 (unlimited).",
     },
-    {
-        .longopt_id = OPT_NO_CLIPBOARD_AUTOSYNC,
-        .longopt = "no-clipboard-autosync",
-        .text = "By default, scrcpy automatically synchronizes the computer "
-                "clipboard to the device clipboard before injecting Ctrl+v, "
-                "and the device clipboard to the computer clipboard whenever "
-                "it changes.\n"
-                "This option disables this automatic synchronization."
-    },
     {
         .shortopt = 'n',
         .longopt = "no-control",
@@ -1374,9 +1364,6 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                     return false;
                 }
                 break;
-            case OPT_NO_CLIPBOARD_AUTOSYNC:
-                opts->clipboard_autosync = false;
-                break;
 #ifdef HAVE_V4L2
             case OPT_V4L2_SINK:
                 opts->v4l2_device = optarg;

app/src/compat.h

@@ -1,17 +1,16 @@
 #ifndef COMPAT_H
 #define COMPAT_H
 
-#include "config.h"
+#define _POSIX_C_SOURCE 200809L
+#define _XOPEN_SOURCE 700
+#define _GNU_SOURCE
+#ifdef __APPLE__
+# define _DARWIN_C_SOURCE
+#endif
 
 #include <libavformat/version.h>
 #include <SDL2/SDL_version.h>
 
-#ifndef __WIN32
-# define PRIu64_ PRIu64
-#else
-# define PRIu64_ "I64u"  // Windows...
-#endif
-
 // In ffmpeg/doc/APIchanges:
 // 2018-02-06 - 0694d87024 - lavf 58.9.100 - avformat.h
 //   Deprecate use of av_register_input_format(), av_register_output_format(),

app/src/control_msg.c

@@ -118,12 +118,11 @@ control_msg_serialize(const struct control_msg *msg, unsigned char *buf) {
             buf[1] = msg->inject_keycode.action;
             return 2;
         case CONTROL_MSG_TYPE_SET_CLIPBOARD: {
-            buffer_write64be(&buf[1], msg->set_clipboard.sequence);
-            buf[9] = !!msg->set_clipboard.paste;
+            buf[1] = !!msg->set_clipboard.paste;
             size_t len = write_string(msg->set_clipboard.text,
                                       CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH,
-                                      &buf[10]);
-            return 10 + len;
+                                      &buf[2]);
+            return 2 + len;
         }
         case CONTROL_MSG_TYPE_SET_SCREEN_POWER_MODE:
             buf[1] = msg->set_screen_power_mode.mode;
@@ -171,6 +170,11 @@ control_msg_log(const struct control_msg *msg) {
                          (long) msg->inject_touch_event.buttons);
             } else {
                 // numeric pointer id
+#ifndef __WIN32
+# define PRIu64_ PRIu64
+#else
+# define PRIu64_ "I64u"  // Windows...
+#endif
                 LOG_CMSG("touch [id=%" PRIu64_ "] %-4s position=%" PRIi32 ",%"
                              PRIi32 " pressure=%g buttons=%06lx",
                          id,
@@ -195,8 +199,7 @@ control_msg_log(const struct control_msg *msg) {
                      KEYEVENT_ACTION_LABEL(msg->inject_keycode.action));
             break;
         case CONTROL_MSG_TYPE_SET_CLIPBOARD:
-            LOG_CMSG("clipboard %" PRIu64_ " %s \"%s\"",
-                     msg->set_clipboard.sequence,
+            LOG_CMSG("clipboard %s \"%s\"",
                      msg->set_clipboard.paste ? "paste" : "copy",
                      msg->set_clipboard.text);
             break;

app/src/control_msg.h

@@ -70,7 +70,6 @@ struct control_msg {
             // screen may only be turned on on ACTION_DOWN
         } back_or_screen_on;
         struct {
-            uint64_t sequence;
             char *text; // owned, to be freed by free()
             bool paste;
         } set_clipboard;

app/src/controller.c

@@ -5,11 +5,10 @@
 #include "util/log.h"
 
 bool
-controller_init(struct controller *controller, sc_socket control_socket,
-                struct sc_acksync *acksync) {
+controller_init(struct controller *controller, sc_socket control_socket) {
     cbuf_init(&controller->queue);
 
-    bool ok = receiver_init(&controller->receiver, control_socket, acksync);
+    bool ok = receiver_init(&controller->receiver, control_socket);
     if (!ok) {
         return false;
     }

app/src/controller.h

@@ -7,7 +7,6 @@
 
 #include "control_msg.h"
 #include "receiver.h"
-#include "util/acksync.h"
 #include "util/cbuf.h"
 #include "util/net.h"
 #include "util/thread.h"
@@ -25,8 +24,7 @@ struct controller {
 };
 
 bool
-controller_init(struct controller *controller, sc_socket control_socket,
-                struct sc_acksync *acksync);
+controller_init(struct controller *controller, sc_socket control_socket);
 
 void
 controller_destroy(struct controller *controller);

app/src/device_msg.c

@@ -1,6 +1,5 @@
 #include "device_msg.h"
 
-#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -35,11 +34,6 @@ device_msg_deserialize(const unsigned char *buf, size_t len,
             msg->clipboard.text = text;
             return 5 + clipboard_len;
         }
-        case DEVICE_MSG_TYPE_ACK_CLIPBOARD: {
-            uint64_t sequence = buffer_read64be(&buf[1]);
-            msg->ack_clipboard.sequence = sequence;
-            return 9;
-        }
         default:
             LOGW("Unknown device message type: %d", (int) msg->type);
             return -1; // error, we cannot recover

app/src/device_msg.h

@@ -13,7 +13,6 @@
 
 enum device_msg_type {
     DEVICE_MSG_TYPE_CLIPBOARD,
-    DEVICE_MSG_TYPE_ACK_CLIPBOARD,
 };
 
 struct device_msg {
@@ -22,9 +21,6 @@ struct device_msg {
         struct {
             char *text; // owned, to be freed by free()
         } clipboard;
-        struct {
-            uint64_t sequence;
-        } ack_clipboard;
     };
 };
 

app/src/hid_keyboard.c

@@ -278,8 +278,7 @@ push_mod_lock_state(struct sc_hid_keyboard *kb, uint16_t sdl_mod) {
 
 static void
 sc_key_processor_process_key(struct sc_key_processor *kp,
-                             const SDL_KeyboardEvent *event,
-                             uint64_t ack_to_wait) {
+                             const SDL_KeyboardEvent *event) {
     if (event->repeat) {
         // In USB HID protocol, key repeat is handled by the host (Android), so
         // just ignore key repeat here.
@@ -299,12 +298,16 @@ sc_key_processor_process_key(struct sc_key_processor *kp,
             }
         }
 
-        if (ack_to_wait) {
+        SDL_Keycode keycode = event->keysym.sym;
+        bool down = event->type == SDL_KEYDOWN;
+        bool ctrl = event->keysym.mod & KMOD_CTRL;
+        bool shift = event->keysym.mod & KMOD_SHIFT;
+        if (ctrl && !shift && keycode == SDLK_v && down) {
             // Ctrl+v is pressed, so clipboard synchronization has been
-            // requested. Wait until clipboard synchronization is acknowledged
-            // by the server, otherwise it could paste the old clipboard
-            // content.
-            hid_event.ack_to_wait = ack_to_wait;
+            // requested. Wait a bit so that the clipboard is set before
+            // injecting Ctrl+v via HID, otherwise it would paste the old
+            // clipboard content.
+            hid_event.delay = SC_TICK_FROM_MS(5);
         }
 
         if (!sc_aoa_push_hid_event(kb->aoa, &hid_event)) {
@@ -345,10 +348,6 @@ sc_hid_keyboard_init(struct sc_hid_keyboard *kb, struct sc_aoa *aoa) {
         .process_text = sc_key_processor_process_text,
     };
 
-    // Clipboard synchronization is requested over the control socket, while HID
-    // events are sent over AOA, so it must wait for clipboard synchronization
-    // to be acknowledged by the device before injecting Ctrl+v.
-    kb->key_processor.async_paste = true;
     kb->key_processor.ops = &ops;
 
     return true;

app/src/input_manager.c

@@ -66,7 +66,6 @@ input_manager_init(struct input_manager *im, struct controller *controller,
     im->control = options->control;
     im->forward_all_clicks = options->forward_all_clicks;
     im->legacy_paste = options->legacy_paste;
-    im->clipboard_autosync = options->clipboard_autosync;
 
     const struct sc_shortcut_mods *shortcut_mods = &options->shortcut_mods;
     assert(shortcut_mods->count);
@@ -83,8 +82,6 @@ input_manager_init(struct input_manager *im, struct controller *controller,
     im->last_keycode = SDLK_UNKNOWN;
     im->last_mod = 0;
     im->key_repeat = 0;
-
-    im->next_sequence = 1; // 0 is reserved for SC_SEQUENCE_INVALID
 }
 
 static void
@@ -211,35 +208,35 @@ collapse_panels(struct controller *controller) {
     }
 }
 
-static bool
-set_device_clipboard(struct controller *controller, bool paste,
-                     uint64_t sequence) {
+static void
+set_device_clipboard(struct controller *controller, bool paste) {
     char *text = SDL_GetClipboardText();
     if (!text) {
         LOGW("Could not get clipboard text: %s", SDL_GetError());
-        return false;
+        return;
+    }
+    if (!*text) {
+        // empty text
+        SDL_free(text);
+        return;
     }
 
     char *text_dup = strdup(text);
     SDL_free(text);
     if (!text_dup) {
         LOGW("Could not strdup input text");
-        return false;
+        return;
     }
 
     struct control_msg msg;
     msg.type = CONTROL_MSG_TYPE_SET_CLIPBOARD;
-    msg.set_clipboard.sequence = sequence;
     msg.set_clipboard.text = text_dup;
     msg.set_clipboard.paste = paste;
 
     if (!controller_push_msg(controller, &msg)) {
         free(text_dup);
         LOGW("Could not request 'set device clipboard'");
-        return false;
     }
-
-    return true;
 }
 
 static void
@@ -465,10 +462,8 @@ input_manager_process_key(struct input_manager *im,
                         // inject the text as input events
                         clipboard_paste(controller);
                     } else {
-                        // store the text in the device clipboard and paste,
-                        // without requesting an acknowledgment
-                        set_device_clipboard(controller, true,
-                                             SC_SEQUENCE_INVALID);
+                        // store the text in the device clipboard and paste
+                        set_device_clipboard(controller, true);
                     }
                 }
                 return;
@@ -517,36 +512,18 @@ input_manager_process_key(struct input_manager *im,
         return;
     }
 
-    uint64_t ack_to_wait = SC_SEQUENCE_INVALID;
-    bool is_ctrl_v = ctrl && !shift && keycode == SDLK_v && down && !repeat;
-    if (im->clipboard_autosync && is_ctrl_v) {
+    if (ctrl && !shift && keycode == SDLK_v && down && !repeat) {
         if (im->legacy_paste) {
             // inject the text as input events
             clipboard_paste(controller);
             return;
         }
-
-        // Request an acknowledgement only if necessary
-        uint64_t sequence = im->kp->async_paste ? im->next_sequence
-                                                : SC_SEQUENCE_INVALID;
-
         // Synchronize the computer clipboard to the device clipboard before
         // sending Ctrl+v, to allow seamless copy-paste.
-        bool ok = set_device_clipboard(controller, false, sequence);
-        if (!ok) {
-            LOGW("Clipboard could not be synchronized, Ctrl+v not injected");
-            return;
-        }
-
-        if (im->kp->async_paste) {
-            // The key processor must wait for this ack before injecting Ctrl+v
-            ack_to_wait = sequence;
-            // Increment only when the request succeeded
-            ++im->next_sequence;
-        }
+        set_device_clipboard(controller, false);
     }
 
-    im->kp->ops->process_key(im->kp, event, ack_to_wait);
+    im->kp->ops->process_key(im->kp, event);
 }
 
 static void

app/src/input_manager.h

@@ -24,7 +24,6 @@ struct input_manager {
     bool control;
     bool forward_all_clicks;
     bool legacy_paste;
-    bool clipboard_autosync;
 
     struct {
         unsigned data[SC_MAX_SHORTCUT_MODS];
@@ -39,8 +38,6 @@ struct input_manager {
     unsigned key_repeat;
     SDL_Keycode last_keycode;
     uint16_t last_mod;
-
-    uint64_t next_sequence; // used for request acknowledgements
 };
 
 void

app/src/keyboard_inject.c

@@ -188,13 +188,7 @@ convert_input_key(const SDL_KeyboardEvent *from, struct control_msg *to,
 
 static void
 sc_key_processor_process_key(struct sc_key_processor *kp,
-                             const SDL_KeyboardEvent *event,
-                             uint64_t ack_to_wait) {
-    // The device clipboard synchronization and the key event messages are
-    // serialized, there is nothing special to do to ensure that the clipboard
-    // is set before injecting Ctrl+v.
-    (void) ack_to_wait;
-
+                             const SDL_KeyboardEvent *event) {
     struct sc_keyboard_inject *ki = DOWNCAST(kp);
 
     if (event->repeat) {
@@ -256,7 +250,5 @@ sc_keyboard_inject_init(struct sc_keyboard_inject *ki,
         .process_text = sc_key_processor_process_text,
     };
 
-    // Key injection and clipboard synchronization are serialized
-    ki->key_processor.async_paste = false;
     ki->key_processor.ops = &ops;
 }

app/src/options.c

@@ -53,5 +53,4 @@ const struct scrcpy_options scrcpy_options_default = {
     .forward_all_clicks = false,
     .legacy_paste = false,
     .power_off_on_close = false,
-    .clipboard_autosync = true,
 };

app/src/options.h

@@ -108,7 +108,6 @@ struct scrcpy_options {
     bool forward_all_clicks;
     bool legacy_paste;
     bool power_off_on_close;
-    bool clipboard_autosync;
 };
 
 extern const struct scrcpy_options scrcpy_options_default;

app/src/receiver.c

@@ -7,16 +7,12 @@
 #include "util/log.h"
 
 bool
-receiver_init(struct receiver *receiver, sc_socket control_socket,
-              struct sc_acksync *acksync) {
+receiver_init(struct receiver *receiver, sc_socket control_socket) {
     bool ok = sc_mutex_init(&receiver->mutex);
     if (!ok) {
         return false;
     }
-
     receiver->control_socket = control_socket;
-    receiver->acksync = acksync;
-
     return true;
 }
 
@@ -26,7 +22,7 @@ receiver_destroy(struct receiver *receiver) {
 }
 
 static void
-process_msg(struct receiver *receiver, struct device_msg *msg) {
+process_msg(struct device_msg *msg) {
     switch (msg->type) {
         case DEVICE_MSG_TYPE_CLIPBOARD: {
             char *current = SDL_GetClipboardText();
@@ -41,17 +37,11 @@ process_msg(struct receiver *receiver, struct device_msg *msg) {
             SDL_SetClipboardText(msg->clipboard.text);
             break;
         }
-        case DEVICE_MSG_TYPE_ACK_CLIPBOARD:
-            assert(receiver->acksync);
-            LOGD("Ack device clipboard sequence=%" PRIu64_,
-                 msg->ack_clipboard.sequence);
-            sc_acksync_ack(receiver->acksync, msg->ack_clipboard.sequence);
-            break;
     }
 }
 
 static ssize_t
-process_msgs(struct receiver *receiver, const unsigned char *buf, size_t len) {
+process_msgs(const unsigned char *buf, size_t len) {
     size_t head = 0;
     for (;;) {
         struct device_msg msg;
@@ -63,7 +53,7 @@ process_msgs(struct receiver *receiver, const unsigned char *buf, size_t len) {
             return head;
         }
 
-        process_msg(receiver, &msg);
+        process_msg(&msg);
         device_msg_destroy(&msg);
 
         head += r;
@@ -91,7 +81,7 @@ run_receiver(void *data) {
         }
 
         head += r;
-        ssize_t consumed = process_msgs(receiver, buf, head);
+        ssize_t consumed = process_msgs(buf, head);
         if (consumed == -1) {
             // an error occurred
             break;

app/src/receiver.h

@@ -5,7 +5,6 @@
 
 #include <stdbool.h>
 
-#include "util/acksync.h"
 #include "util/net.h"
 #include "util/thread.h"
 
@@ -15,13 +14,10 @@ struct receiver {
     sc_socket control_socket;
     sc_thread thread;
     sc_mutex mutex;
-
-    struct sc_acksync *acksync;
 };
 
 bool
-receiver_init(struct receiver *receiver, sc_socket control_socket,
-              struct sc_acksync *acksync);
+receiver_init(struct receiver *receiver, sc_socket control_socket);
 
 void
 receiver_destroy(struct receiver *receiver);

app/src/scrcpy.c

@@ -27,7 +27,6 @@
 #include "screen.h"
 #include "server.h"
 #include "stream.h"
-#include "util/acksync.h"
 #include "util/log.h"
 #include "util/net.h"
 #ifdef HAVE_V4L2
@@ -47,8 +46,6 @@ struct scrcpy {
     struct file_handler file_handler;
 #ifdef HAVE_AOA_HID
     struct sc_aoa aoa;
-    // sequence/ack helper to synchronize clipboard and Ctrl+v via HID
-    struct sc_acksync acksync;
 #endif
     union {
         struct sc_keyboard_inject keyboard_inject;
@@ -343,8 +340,6 @@ scrcpy(struct scrcpy_options *options) {
     bool controller_started = false;
     bool screen_initialized = false;
 
-    struct sc_acksync *acksync = NULL;
-
     struct sc_server_params params = {
         .serial = options->serial,
         .log_level = options->log_level,
@@ -364,7 +359,6 @@ scrcpy(struct scrcpy_options *options) {
         .encoder_name = options->encoder_name,
         .force_adb_forward = options->force_adb_forward,
         .power_off_on_close = options->power_off_on_close,
-        .clipboard_autosync = options->clipboard_autosync,
     };
 
     static const struct sc_server_callbacks cbs = {
@@ -451,18 +445,7 @@ scrcpy(struct scrcpy_options *options) {
     }
 
     if (options->control) {
-#ifdef HAVE_AOA_HID
-        if (options->keyboard_input_mode == SC_KEYBOARD_INPUT_MODE_HID) {
-            bool ok = sc_acksync_init(&s->acksync);
-            if (!ok) {
-                goto end;
-            }
-
-            acksync = &s->acksync;
-        }
-#endif
-        if (!controller_init(&s->controller, s->server.control_socket,
-                             acksync)) {
+        if (!controller_init(&s->controller, s->server.control_socket)) {
             goto end;
         }
         controller_initialized = true;
@@ -538,7 +521,7 @@ scrcpy(struct scrcpy_options *options) {
 #ifdef HAVE_AOA_HID
             bool aoa_hid_ok = false;
 
-            bool ok = sc_aoa_init(&s->aoa, serial, acksync);
+            bool ok = sc_aoa_init(&s->aoa, serial);
             if (!ok) {
                 goto aoa_hid_end;
             }
@@ -603,9 +586,6 @@ end:
         sc_hid_keyboard_destroy(&s->keyboard_hid);
         sc_aoa_stop(&s->aoa);
     }
-    if (acksync) {
-        sc_acksync_destroy(acksync);
-    }
 #endif
     if (controller_started) {
         controller_stop(&s->controller);

app/src/server.c

@@ -186,7 +186,6 @@ execute_server(struct sc_server *server,
         params->codec_options ? params->codec_options : "-",
         params->encoder_name ? params->encoder_name : "-",
         params->power_off_on_close ? "true" : "false",
-        params->clipboard_autosync ? "true" : "false",
     };
 #ifdef SERVER_DEBUGGER
     LOGI("Server debugger waiting for a client on device port "

app/src/server.h

@@ -41,7 +41,6 @@ struct sc_server_params {
     bool stay_awake;
     bool force_adb_forward;
     bool power_off_on_close;
-    bool clipboard_autosync;
 };
 
 struct sc_server {

app/src/sys/win/process.c

@@ -1,3 +1,6 @@
+// <https://devblogs.microsoft.com/oldnewthing/20111216-00/?p=8873>
+#define _WIN32_WINNT 0x0600 // For extended process API
+
 #include "util/process.h"
 
 #include <processthreadsapi.h>

app/src/trait/key_processor.h

@@ -14,31 +14,12 @@
  * Component able to process and inject keys should implement this trait.
  */
 struct sc_key_processor {
-    /**
-     * Set by the implementation to indicate that it must explicitly wait for
-     * the clipboard to be set on the device before injecting Ctrl+v to avoid
-     * race conditions. If it is set, the input_manager will pass a valid
-     * ack_to_wait to process_key() in case of clipboard synchronization
-     * resulting of the key event.
-     */
-    bool async_paste;
-
     const struct sc_key_processor_ops *ops;
 };
 
 struct sc_key_processor_ops {
-
-    /**
-     * Process the keyboard event
-     *
-     * The `sequence` number (if different from `SC_SEQUENCE_INVALID`) indicates
-     * the acknowledgement number to wait for before injecting this event.
-     * This allows to ensure that the device clipboard is set before injecting
-     * Ctrl+v on the device.
-     */
     void
-    (*process_key)(struct sc_key_processor *kp, const SDL_KeyboardEvent *event,
-                   uint64_t ack_to_wait);
+    (*process_key)(struct sc_key_processor *kp, const SDL_KeyboardEvent *event);
 
     void
     (*process_text)(struct sc_key_processor *kp,

app/src/util/acksync.c

@@ -1,76 +0,0 @@
-#include "acksync.h"
-
-#include <assert.h>
-#include "util/log.h"
-
-bool
-sc_acksync_init(struct sc_acksync *as) {
-    bool ok = sc_mutex_init(&as->mutex);
-    if (!ok) {
-        return false;
-    }
-
-    ok = sc_cond_init(&as->cond);
-    if (!ok) {
-        sc_mutex_destroy(&as->mutex);
-        return false;
-    }
-
-    as->stopped = false;
-    as->ack = SC_SEQUENCE_INVALID;
-
-    return true;
-}
-
-void
-sc_acksync_destroy(struct sc_acksync *as) {
-    sc_cond_destroy(&as->cond);
-    sc_mutex_destroy(&as->mutex);
-}
-
-void
-sc_acksync_ack(struct sc_acksync *as, uint64_t sequence) {
-    sc_mutex_lock(&as->mutex);
-
-    // Acknowledgements must be monotonic
-    assert(sequence >= as->ack);
-
-    as->ack = sequence;
-    sc_cond_signal(&as->cond);
-
-    sc_mutex_unlock(&as->mutex);
-}
-
-enum sc_acksync_wait_result
-sc_acksync_wait(struct sc_acksync *as, uint64_t ack, sc_tick deadline) {
-    sc_mutex_lock(&as->mutex);
-
-    bool timed_out = false;
-    while (!as->stopped && as->ack < ack && !timed_out) {
-        timed_out = !sc_cond_timedwait(&as->cond, &as->mutex, deadline);
-    }
-
-    enum sc_acksync_wait_result ret;
-    if (as->stopped) {
-        ret = SC_ACKSYNC_WAIT_INTR;
-    } else if (as->ack >= ack) {
-        ret = SC_ACKSYNC_WAIT_OK;
-    } else {
-        assert(timed_out);
-        ret = SC_ACKSYNC_WAIT_TIMEOUT;
-    }
-    sc_mutex_unlock(&as->mutex);
-
-    return ret;
-}
-
-/**
- * Interrupt any `sc_acksync_wait()`
- */
-void
-sc_acksync_interrupt(struct sc_acksync *as) {
-    sc_mutex_lock(&as->mutex);
-    as->stopped = true;
-    sc_cond_signal(&as->cond);
-    sc_mutex_unlock(&as->mutex);
-}

app/src/util/acksync.h

@@ -1,66 +0,0 @@
-#ifndef SC_ACK_SYNC_H
-#define SC_ACK_SYNC_H
-
-#include "common.h"
-
-#include "thread.h"
-
-#define SC_SEQUENCE_INVALID 0
-
-/**
- * Helper to wait for acknowledgments
- *
- * In practice, it is used to wait for device clipboard acknowledgement from the
- * server before injecting Ctrl+v via AOA HID, in order to avoid pasting the
- * content of the old device clipboard (if Ctrl+v was injected before the
- * clipboard content was actually set).
- */
-struct sc_acksync {
-    sc_mutex mutex;
-    sc_cond cond;
-
-    bool stopped;
-
-    // Last acked value, initially SC_SEQUENCE_INVALID
-    uint64_t ack;
-};
-
-enum sc_acksync_wait_result {
-    // Acknowledgment received
-    SC_ACKSYNC_WAIT_OK,
-
-    // Timeout expired
-    SC_ACKSYNC_WAIT_TIMEOUT,
-
-    // Interrupted from another thread by sc_acksync_interrupt()
-    SC_ACKSYNC_WAIT_INTR,
-};
-
-bool
-sc_acksync_init(struct sc_acksync *as);
-
-void
-sc_acksync_destroy(struct sc_acksync *as);
-
-/**
- * Acknowledge `sequence`
- *
- * The `sequence` must be greater than (or equal to) any previous acknowledged
- * sequence.
- */
-void
-sc_acksync_ack(struct sc_acksync *as, uint64_t sequence);
-
-/**
- * Wait for acknowledgment of sequence `ack` (or higher)
- */
-enum sc_acksync_wait_result
-sc_acksync_wait(struct sc_acksync *as, uint64_t ack, sc_tick deadline);
-
-/**
- * Interrupt any `sc_acksync_wait()`
- */
-void
-sc_acksync_interrupt(struct sc_acksync *as);
-
-#endif

app/src/util/net.c

@@ -1,3 +1,7 @@
+// For inet_pton() on Windows
+#define _WIN32_WINNT 0x0600
+#define WINVER 0x0600
+
 #include "net.h"
 
 #include <assert.h>

app/tests/test_control_msg_serialize.c

@@ -78,7 +78,7 @@ static void test_serialize_inject_touch_event(void) {
         .type = CONTROL_MSG_TYPE_INJECT_TOUCH_EVENT,
         .inject_touch_event = {
             .action = AMOTION_EVENT_ACTION_DOWN,
-            .pointer_id = UINT64_C(0x1234567887654321),
+            .pointer_id = 0x1234567887654321L,
             .position = {
                 .point = {
                     .x = 100,
@@ -226,7 +226,6 @@ static void test_serialize_set_clipboard(void) {
     struct control_msg msg = {
         .type = CONTROL_MSG_TYPE_SET_CLIPBOARD,
         .set_clipboard = {
-            .sequence = UINT64_C(0x0102030405060708),
             .paste = true,
             .text = "hello, world!",
         },
@@ -234,11 +233,10 @@ static void test_serialize_set_clipboard(void) {
 
     unsigned char buf[CONTROL_MSG_MAX_SIZE];
     size_t size = control_msg_serialize(&msg, buf);
-    assert(size == 27);
+    assert(size == 19);
 
     const unsigned char expected[] = {
         CONTROL_MSG_TYPE_SET_CLIPBOARD,
-        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, // sequence
         1, // paste
         0x00, 0x00, 0x00, 0x0d, // text length
         'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', // text

app/tests/test_device_msg_deserialize.c

@@ -47,26 +47,11 @@ static void test_deserialize_clipboard_big(void) {
     device_msg_destroy(&msg);
 }
 
-static void test_deserialize_ack_set_clipboard(void) {
-    const unsigned char input[] = {
-        DEVICE_MSG_TYPE_ACK_CLIPBOARD,
-        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, // sequence
-    };
-
-    struct device_msg msg;
-    ssize_t r = device_msg_deserialize(input, sizeof(input), &msg);
-    assert(r == 9);
-
-    assert(msg.type == DEVICE_MSG_TYPE_ACK_CLIPBOARD);
-    assert(msg.ack_clipboard.sequence == UINT64_C(0x0102030405060708));
-}
-
 int main(int argc, char *argv[]) {
     (void) argc;
     (void) argv;
 
     test_deserialize_clipboard();
     test_deserialize_clipboard_big();
-    test_deserialize_ack_set_clipboard();
     return 0;
 }

server/src/main/java/com/genymobile/scrcpy/ControlMessage.java

@@ -18,8 +18,6 @@ public final class ControlMessage {
     public static final int TYPE_SET_SCREEN_POWER_MODE = 10;
     public static final int TYPE_ROTATE_DEVICE = 11;
 
-    public static final long SEQUENCE_INVALID = 0;
-
     private int type;
     private String text;
     private int metaState; // KeyEvent.META_*
@@ -33,7 +31,6 @@ public final class ControlMessage {
     private int vScroll;
     private boolean paste;
     private int repeat;
-    private long sequence;
 
     private ControlMessage() {
     }
@@ -82,10 +79,9 @@ public final class ControlMessage {
         return msg;
     }
 
-    public static ControlMessage createSetClipboard(long sequence, String text, boolean paste) {
+    public static ControlMessage createSetClipboard(String text, boolean paste) {
         ControlMessage msg = new ControlMessage();
         msg.type = TYPE_SET_CLIPBOARD;
-        msg.sequence = sequence;
         msg.text = text;
         msg.paste = paste;
         return msg;
@@ -158,8 +154,4 @@ public final class ControlMessage {
     public int getRepeat() {
         return repeat;
     }
-
-    public long getSequence() {
-        return sequence;
-    }
 }

server/src/main/java/com/genymobile/scrcpy/ControlMessageReader.java

@@ -13,11 +13,11 @@ public class ControlMessageReader {
     static final int INJECT_SCROLL_EVENT_PAYLOAD_LENGTH = 20;
     static final int BACK_OR_SCREEN_ON_LENGTH = 1;
     static final int SET_SCREEN_POWER_MODE_PAYLOAD_LENGTH = 1;
-    static final int SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH = 9;
+    static final int SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH = 1;
 
     private static final int MESSAGE_MAX_SIZE = 1 << 18; // 256k
 
-    public static final int CLIPBOARD_TEXT_MAX_LENGTH = MESSAGE_MAX_SIZE - 14; // type: 1 byte; sequence: 8 bytes; paste flag: 1 byte; length: 4 bytes
+    public static final int CLIPBOARD_TEXT_MAX_LENGTH = MESSAGE_MAX_SIZE - 6; // type: 1 byte; paste flag: 1 byte; length: 4 bytes
     public static final int INJECT_TEXT_MAX_LENGTH = 300;
 
     private final byte[] rawBuffer = new byte[MESSAGE_MAX_SIZE];
@@ -166,13 +166,12 @@ public class ControlMessageReader {
         if (buffer.remaining() < SET_CLIPBOARD_FIXED_PAYLOAD_LENGTH) {
             return null;
         }
-        long sequence = buffer.getLong();
         boolean paste = buffer.get() != 0;
         String text = parseString();
         if (text == null) {
             return null;
         }
-        return ControlMessage.createSetClipboard(sequence, text, paste);
+        return ControlMessage.createSetClipboard(text, paste);
     }
 
     private ControlMessage parseSetScreenPowerMode() {

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -120,12 +120,7 @@ public class Controller {
                 }
                 break;
             case ControlMessage.TYPE_SET_CLIPBOARD:
-                long sequence = msg.getSequence();
                 setClipboard(msg.getText(), msg.getPaste());
-                if (sequence != ControlMessage.SEQUENCE_INVALID) {
-                    // Acknowledgement requested
-                    sender.pushAckClipboard(sequence);
-                }
                 break;
             case ControlMessage.TYPE_SET_SCREEN_POWER_MODE:
                 if (device.supportsInputEvents()) {

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -82,8 +82,8 @@ public final class Device {
             }
         }, displayId);
 
-        if (options.getControl() && options.getClipboardAutosync()) {
-            // If control and autosync are enabled, synchronize Android clipboard to the computer automatically
+        if (options.getControl()) {
+            // If control is enabled, synchronize Android clipboard to the computer automatically
             ClipboardManager clipboardManager = SERVICE_MANAGER.getClipboardManager();
             if (clipboardManager != null) {
                 clipboardManager.addPrimaryClipChangedListener(new IOnPrimaryClipChangedListener.Stub() {

server/src/main/java/com/genymobile/scrcpy/DeviceMessage.java

@@ -3,13 +3,9 @@ package com.genymobile.scrcpy;
 public final class DeviceMessage {
 
     public static final int TYPE_CLIPBOARD = 0;
-    public static final int TYPE_ACK_CLIPBOARD = 1;
-
-    public static final long SEQUENCE_INVALID = ControlMessage.SEQUENCE_INVALID;
 
     private int type;
     private String text;
-    private long sequence;
 
     private DeviceMessage() {
     }
@@ -21,13 +17,6 @@ public final class DeviceMessage {
         return event;
     }
 
-    public static DeviceMessage createAckClipboard(long sequence) {
-        DeviceMessage event = new DeviceMessage();
-        event.type = TYPE_ACK_CLIPBOARD;
-        event.sequence = sequence;
-        return event;
-    }
-
     public int getType() {
         return type;
     }
@@ -35,8 +24,4 @@ public final class DeviceMessage {
     public String getText() {
         return text;
     }
-
-    public long getSequence() {
-        return sequence;
-    }
 }

server/src/main/java/com/genymobile/scrcpy/DeviceMessageSender.java

@@ -8,8 +8,6 @@ public final class DeviceMessageSender {
 
     private String clipboardText;
 
-    private long ack;
-
     public DeviceMessageSender(DesktopConnection connection) {
         this.connection = connection;
     }
@@ -19,34 +17,18 @@ public final class DeviceMessageSender {
         notify();
     }
 
-    public synchronized void pushAckClipboard(long sequence) {
-        ack = sequence;
-        notify();
-    }
-
     public void loop() throws IOException, InterruptedException {
         while (true) {
             String text;
-            long sequence;
             synchronized (this) {
-                while (ack == DeviceMessage.SEQUENCE_INVALID && clipboardText == null) {
+                while (clipboardText == null) {
                     wait();
                 }
                 text = clipboardText;
                 clipboardText = null;
-
-                sequence = ack;
-                ack = DeviceMessage.SEQUENCE_INVALID;
-            }
-
-            if (sequence != DeviceMessage.SEQUENCE_INVALID) {
-                DeviceMessage event = DeviceMessage.createAckClipboard(sequence);
-                connection.sendDeviceMessage(event);
-            }
-            if (text != null) {
-                DeviceMessage event = DeviceMessage.createClipboard(text);
-                connection.sendDeviceMessage(event);
             }
+            DeviceMessage event = DeviceMessage.createClipboard(text);
+            connection.sendDeviceMessage(event);
         }
     }
 }

server/src/main/java/com/genymobile/scrcpy/DeviceMessageWriter.java

@@ -15,7 +15,7 @@ public class DeviceMessageWriter {
 
     public void writeTo(DeviceMessage msg, OutputStream output) throws IOException {
         buffer.clear();
-        buffer.put((byte) msg.getType());
+        buffer.put((byte) DeviceMessage.TYPE_CLIPBOARD);
         switch (msg.getType()) {
             case DeviceMessage.TYPE_CLIPBOARD:
                 String text = msg.getText();
@@ -25,10 +25,6 @@ public class DeviceMessageWriter {
                 buffer.put(raw, 0, len);
                 output.write(rawBuffer, 0, buffer.position());
                 break;
-            case DeviceMessage.TYPE_ACK_CLIPBOARD:
-                buffer.putLong(msg.getSequence());
-                output.write(rawBuffer, 0, buffer.position());
-                break;
             default:
                 Ln.w("Unknown device message: " + msg.getType());
                 break;

server/src/main/java/com/genymobile/scrcpy/Options.java

@@ -18,7 +18,6 @@ public class Options {
     private String codecOptions;
     private String encoderName;
     private boolean powerOffScreenOnClose;
-    private boolean clipboardAutosync;
 
     public Ln.Level getLogLevel() {
         return logLevel;
@@ -139,12 +138,4 @@ public class Options {
     public boolean getPowerOffScreenOnClose() {
         return this.powerOffScreenOnClose;
     }
-
-    public boolean getClipboardAutosync() {
-        return clipboardAutosync;
-    }
-
-    public void setClipboardAutosync(boolean clipboardAutosync) {
-        this.clipboardAutosync = clipboardAutosync;
-    }
 }

server/src/main/java/com/genymobile/scrcpy/Server.java

@@ -160,7 +160,7 @@ public final class Server {
                     "The server version (" + BuildConfig.VERSION_NAME + ") does not match the client " + "(" + clientVersion + ")");
         }
 
-        final int expectedParameters = 17;
+        final int expectedParameters = 16;
         if (args.length != expectedParameters) {
             throw new IllegalArgumentException("Expecting " + expectedParameters + " parameters");
         }
@@ -213,9 +213,6 @@ public final class Server {
         boolean powerOffScreenOnClose = Boolean.parseBoolean(args[15]);
         options.setPowerOffScreenOnClose(powerOffScreenOnClose);
 
-        boolean clipboardAutosync = Boolean.parseBoolean(args[16]);
-        options.setClipboardAutosync(clipboardAutosync);
-
         return options;
     }
 

server/src/test/java/com/genymobile/scrcpy/ControlMessageReaderTest.java

@@ -235,7 +235,6 @@ public class ControlMessageReaderTest {
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         DataOutputStream dos = new DataOutputStream(bos);
         dos.writeByte(ControlMessage.TYPE_SET_CLIPBOARD);
-        dos.writeLong(0x0102030405060708L); // sequence
         dos.writeByte(1); // paste
         byte[] text = "testé".getBytes(StandardCharsets.UTF_8);
         dos.writeInt(text.length);
@@ -247,7 +246,6 @@ public class ControlMessageReaderTest {
         ControlMessage event = reader.next();
 
         Assert.assertEquals(ControlMessage.TYPE_SET_CLIPBOARD, event.getType());
-        Assert.assertEquals(0x0102030405060708L, event.getSequence());
         Assert.assertEquals("testé", event.getText());
         Assert.assertTrue(event.getPaste());
     }
@@ -261,7 +259,6 @@ public class ControlMessageReaderTest {
         dos.writeByte(ControlMessage.TYPE_SET_CLIPBOARD);
 
         byte[] rawText = new byte[ControlMessageReader.CLIPBOARD_TEXT_MAX_LENGTH];
-        dos.writeLong(0x0807060504030201L); // sequence
         dos.writeByte(1); // paste
         Arrays.fill(rawText, (byte) 'a');
         String text = new String(rawText, 0, rawText.length);
@@ -275,7 +272,6 @@ public class ControlMessageReaderTest {
         ControlMessage event = reader.next();
 
         Assert.assertEquals(ControlMessage.TYPE_SET_CLIPBOARD, event.getType());
-        Assert.assertEquals(0x0807060504030201L, event.getSequence());
         Assert.assertEquals(text, event.getText());
         Assert.assertTrue(event.getPaste());
     }

server/src/test/java/com/genymobile/scrcpy/DeviceMessageWriterTest.java

@@ -32,24 +32,4 @@ public class DeviceMessageWriterTest {
 
         Assert.assertArrayEquals(expected, actual);
     }
-
-    @Test
-    public void testSerializeAckSetClipboard() throws IOException {
-        DeviceMessageWriter writer = new DeviceMessageWriter();
-
-        ByteArrayOutputStream bos = new ByteArrayOutputStream();
-        DataOutputStream dos = new DataOutputStream(bos);
-        dos.writeByte(DeviceMessage.TYPE_ACK_CLIPBOARD);
-        dos.writeLong(0x0102030405060708L);
-
-        byte[] expected = bos.toByteArray();
-
-        DeviceMessage msg = DeviceMessage.createAckClipboard(0x0102030405060708L);
-        bos = new ByteArrayOutputStream();
-        writer.writeTo(msg, bos);
-
-        byte[] actual = bos.toByteArray();
-
-        Assert.assertArrayEquals(expected, actual);
-    }
 }