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Add support for HID mouse

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This commit is contained in:
Romain Vimont
2021-12-26 22:32:51 +01:00
parent ed2e45ee29
commit cba84f6999
7 changed files with 371 additions and 6 deletions
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24
app/src/cli.c
View File

@@ -178,7 +178,8 @@ static const struct sc_option options[] = {
"directly: `adb shell am start -a "
"android.settings.HARD_KEYBOARD_SETTINGS`.\n"
"However, the option is only available when the HID keyboard "
"is enabled (or a physical keyboard is connected).",
"is enabled (or a physical keyboard is connected).\n"
"Also see --hid-mouse.",
},
{
.shortopt = 'h',
@@ -214,6 +215,18 @@ static const struct sc_option options[] = {
.text = "Limit the frame rate of screen capture (officially supported "
"since Android 10, but may work on earlier versions).",
},
{
.shortopt = 'M',
.longopt = "hid-mouse",
.text = "Simulate a physical mouse by using HID over AOAv2.\n"
"In this mode, the computer mouse is captured to control the "
"device directly (relative mouse mode).\n"
"LAlt, LSuper or RSuper toggle the capture mode, to give "
"control of the mouse back to the computer.\n"
"It may only work over USB, and is currently only supported "
"on Linux.\n"
"Also see --hid-keyboard.",
},
{
.shortopt = 'm',
.longopt = "max-size",
@@ -1315,6 +1328,15 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
return false;
}
break;
case 'M':
#ifdef HAVE_AOA_HID
opts->mouse_input_mode = SC_MOUSE_INPUT_MODE_HID;
#else
LOGE("HID over AOA (-M/--hid-mouse) is not supported on this"
"platform. It is only available on Linux.");
return false;
#endif
break;
case OPT_LOCK_VIDEO_ORIENTATION:
if (!parse_lock_video_orientation(optarg,
&opts->lock_video_orientation)) {

267
app/src/hid_mouse.c Normal file
View File

@@ -0,0 +1,267 @@
#include "hid_mouse.h"
#include <assert.h>
#include "input_events.h"
#include "util/log.h"
/** Downcast mouse processor to hid_mouse */
#define DOWNCAST(MP) container_of(MP, struct sc_hid_mouse, mouse_processor)
#define HID_MOUSE_ACCESSORY_ID 2
// 1 byte for buttons + padding, 1 byte for X position, 1 byte for Y position
#define HID_MOUSE_EVENT_SIZE 4
/**
* Mouse descriptor from the specification:
* <https://www.usb.org/sites/default/files/hid1_11.pdf>
*
* Appendix E (p71): §E.10 Report Descriptor (Mouse)
*
* The usage tags (like Wheel) are listed in "HID Usage Tables":
* <https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf>
* §4 Generic Desktop Page (0x01) (p26)
*/
static const unsigned char mouse_report_desc[] = {
// Usage Page (Generic Desktop)
0x05, 0x01,
// Usage (Mouse)
0x09, 0x02,
// Collection (Application)
0xA1, 0x01,
// Usage (Pointer)
0x09, 0x01,
// Collection (Physical)
0xA1, 0x00,
// Usage Page (Buttons)
0x05, 0x09,
// Usage Minimum (1)
0x19, 0x01,
// Usage Maximum (5)
0x29, 0x05,
// Logical Minimum (0)
0x15, 0x00,
// Logical Maximum (1)
0x25, 0x01,
// Report Count (5)
0x95, 0x05,
// Report Size (1)
0x75, 0x01,
// Input (Data, Variable, Absolute): 5 buttons bits
0x81, 0x02,
// Report Count (1)
0x95, 0x01,
// Report Size (3)
0x75, 0x03,
// Input (Constant): 3 bits padding
0x81, 0x01,
// Usage Page (Generic Desktop)
0x05, 0x01,
// Usage (X)
0x09, 0x30,
// Usage (Y)
0x09, 0x31,
// Usage (Wheel)
0x09, 0x38,
// Local Minimum (-127)
0x15, 0x81,
// Local Maximum (127)
0x25, 0x7F,
// Report Size (8)
0x75, 0x08,
// Report Count (3)
0x95, 0x03,
// Input (Data, Variable, Relative): 3 position bytes (X, Y, Wheel)
0x81, 0x06,
// End Collection
0xC0,
// End Collection
0xC0,
};
/**
* A mouse HID event is 3 bytes long:
*
* - byte 0: buttons state
* - byte 1: relative x motion (signed byte from -127 to 127)
* - byte 2: relative y motion (signed byte from -127 to 127)
*
* 7 6 5 4 3 2 1 0
* +---------------+
* byte 0: |0 0 0 . . . . .| buttons state
* +---------------+
* ^ ^ ^ ^ ^
* | | | | `- left button
* | | | `--- right button
* | | `----- middle button
* | `------- button 4
* `--------- button 5
*
* +---------------+
* byte 1: |. . . . . . . .| relative x motion
* +---------------+
* byte 2: |. . . . . . . .| relative y motion
* +---------------+
* byte 3: |. . . . . . . .| wheel motion (-1, 0 or 1)
* +---------------+
*
* As an example, here is the report for a motion of (x=5, y=-4) with left
* button pressed:
*
* +---------------+
* |0 0 0 0 0 0 0 1| left button pressed
* +---------------+
* |0 0 0 0 0 1 0 1| horizontal motion (x = 5)
* +---------------+
* |1 1 1 1 1 1 0 0| relative y motion (y = -4)
* +---------------+
* |0 0 0 0 0 0 0 0| wheel motion
* +---------------+
*/
static bool
sc_hid_mouse_event_init(struct sc_hid_event *hid_event) {
unsigned char *buffer = calloc(1, HID_MOUSE_EVENT_SIZE);
if (!buffer) {
LOG_OOM();
return false;
}
sc_hid_event_init(hid_event, HID_MOUSE_ACCESSORY_ID, buffer,
HID_MOUSE_EVENT_SIZE);
return true;
}
static unsigned char
buttons_state_to_hid_buttons(uint8_t buttons_state) {
unsigned char c = 0;
if (buttons_state & SC_MOUSE_BUTTON_LEFT) {
c |= 1 << 0;
}
if (buttons_state & SC_MOUSE_BUTTON_RIGHT) {
c |= 1 << 1;
}
if (buttons_state & SC_MOUSE_BUTTON_MIDDLE) {
c |= 1 << 2;
}
if (buttons_state & SC_MOUSE_BUTTON_X1) {
c |= 1 << 3;
}
if (buttons_state & SC_MOUSE_BUTTON_X2) {
c |= 1 << 4;
}
return c;
}
static void
sc_mouse_processor_process_mouse_motion(struct sc_mouse_processor *mp,
const struct sc_mouse_motion_event *event) {
struct sc_hid_mouse *mouse = DOWNCAST(mp);
struct sc_hid_event hid_event;
if (!sc_hid_mouse_event_init(&hid_event)) {
return;
}
unsigned char *buffer = hid_event.buffer;
buffer[0] = buttons_state_to_hid_buttons(event->buttons_state);
buffer[1] = CLAMP(event->xrel, -127, 127);
buffer[2] = CLAMP(event->yrel, -127, 127);
buffer[3] = 0; // wheel coordinates only used for scrolling
if (!sc_aoa_push_hid_event(mouse->aoa, &hid_event)) {
sc_hid_event_destroy(&hid_event);
LOGW("Could request HID event");
}
}
static void
sc_mouse_processor_process_mouse_click(struct sc_mouse_processor *mp,
const struct sc_mouse_click_event *event) {
struct sc_hid_mouse *mouse = DOWNCAST(mp);
struct sc_hid_event hid_event;
if (!sc_hid_mouse_event_init(&hid_event)) {
return;
}
unsigned char *buffer = hid_event.buffer;
buffer[0] = buttons_state_to_hid_buttons(event->buttons_state);
buffer[1] = 0; // no x motion
buffer[2] = 0; // no y motion
buffer[3] = 0; // wheel coordinates only used for scrolling
if (!sc_aoa_push_hid_event(mouse->aoa, &hid_event)) {
sc_hid_event_destroy(&hid_event);
LOGW("Could request HID event");
}
}
static void
sc_mouse_processor_process_mouse_scroll(struct sc_mouse_processor *mp,
const struct sc_mouse_scroll_event *event) {
struct sc_hid_mouse *mouse = DOWNCAST(mp);
struct sc_hid_event hid_event;
if (!sc_hid_mouse_event_init(&hid_event)) {
return;
}
unsigned char *buffer = hid_event.buffer;
buffer[0] = 0; // buttons state irrelevant (and unknown)
buffer[1] = 0; // no x motion
buffer[2] = 0; // no y motion
// In practice, vscroll is always -1, 0 or 1, but in theory other values
// are possible
buffer[3] = CLAMP(event->vscroll, -127, 127);
// Horizontal scrolling ignored
if (!sc_aoa_push_hid_event(mouse->aoa, &hid_event)) {
sc_hid_event_destroy(&hid_event);
LOGW("Could request HID event");
}
}
bool
sc_hid_mouse_init(struct sc_hid_mouse *mouse, struct sc_aoa *aoa) {
mouse->aoa = aoa;
bool ok = sc_aoa_setup_hid(aoa, HID_MOUSE_ACCESSORY_ID, mouse_report_desc,
ARRAY_LEN(mouse_report_desc));
if (!ok) {
LOGW("Register HID mouse failed");
return false;
}
static const struct sc_mouse_processor_ops ops = {
.process_mouse_motion = sc_mouse_processor_process_mouse_motion,
.process_mouse_click = sc_mouse_processor_process_mouse_click,
.process_mouse_scroll = sc_mouse_processor_process_mouse_scroll,
// Touch events not supported (coordinates are not relative)
.process_touch = NULL,
};
mouse->mouse_processor.ops = &ops;
mouse->mouse_processor.relative_mode = true;
return true;
}
void
sc_hid_mouse_destroy(struct sc_hid_mouse *mouse) {
bool ok = sc_aoa_unregister_hid(mouse->aoa, HID_MOUSE_ACCESSORY_ID);
if (!ok) {
LOGW("Could not unregister HID");
}
}

23
app/src/hid_mouse.h Normal file
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@@ -0,0 +1,23 @@
#ifndef HID_MOUSE_H
#define HID_MOUSE_H
#include "common.h"
#include <stdbool.h>
#include "aoa_hid.h"
#include "trait/mouse_processor.h"
struct sc_hid_mouse {
struct sc_mouse_processor mouse_processor; // mouse processor trait
struct sc_aoa *aoa;
};
bool
sc_hid_mouse_init(struct sc_hid_mouse *mouse, struct sc_aoa *aoa);
void
sc_hid_mouse_destroy(struct sc_hid_mouse *mouse);
#endif

6
app/src/options.h
View File

@@ -38,6 +38,11 @@ enum sc_keyboard_input_mode {
SC_KEYBOARD_INPUT_MODE_HID,
};
enum sc_mouse_input_mode {
SC_MOUSE_INPUT_MODE_INJECT,
SC_MOUSE_INPUT_MODE_HID,
};
enum sc_key_inject_mode {
// Inject special keys, letters and space as key events.
// Inject numbers and punctuation as text events.
@@ -90,6 +95,7 @@ struct scrcpy_options {
enum sc_log_level log_level;
enum sc_record_format record_format;
enum sc_keyboard_input_mode keyboard_input_mode;
enum sc_mouse_input_mode mouse_input_mode;
struct sc_port_range port_range;
uint32_t tunnel_host;
uint16_t tunnel_port;

42
app/src/scrcpy.c
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@@ -19,6 +19,7 @@
#include "file_handler.h"
#ifdef HAVE_AOA_HID
# include "hid_keyboard.h"
# include "hid_mouse.h"
#endif
#include "keyboard_inject.h"
#include "mouse_inject.h"
@@ -55,7 +56,12 @@ struct scrcpy {
struct sc_hid_keyboard keyboard_hid;
#endif
};
struct sc_mouse_inject mouse_inject;
union {
struct sc_mouse_inject mouse_inject;
#ifdef HAVE_AOA_HID
struct sc_hid_mouse mouse_hid;
#endif
};
};
static inline void
@@ -330,6 +336,7 @@ scrcpy(struct scrcpy_options *options) {
#ifdef HAVE_AOA_HID
bool aoa_hid_initialized = false;
bool hid_keyboard_initialized = false;
bool hid_mouse_initialized = false;
#endif
bool controller_initialized = false;
bool controller_started = false;
@@ -451,7 +458,9 @@ scrcpy(struct scrcpy_options *options) {
#ifdef HAVE_AOA_HID
bool use_hid_keyboard =
options->keyboard_input_mode == SC_KEYBOARD_INPUT_MODE_HID;
if (use_hid_keyboard) {
bool use_hid_mouse =
options->mouse_input_mode == SC_MOUSE_INPUT_MODE_HID;
if (use_hid_keyboard || use_hid_mouse) {
bool ok = sc_acksync_init(&s->acksync);
if (!ok) {
goto end;
@@ -473,7 +482,16 @@ scrcpy(struct scrcpy_options *options) {
}
}
bool need_aoa = hid_keyboard_initialized;
if (use_hid_mouse) {
if (sc_hid_mouse_init(&s->mouse_hid, &s->aoa)) {
hid_mouse_initialized = true;
mp = &s->mouse_hid.mouse_processor;
} else {
LOGE("Could not initialized HID mouse");
}
}
bool need_aoa = hid_keyboard_initialized || hid_mouse_initialized;
if (!need_aoa || !sc_aoa_start(&s->aoa)) {
sc_acksync_destroy(&s->acksync);
@@ -491,6 +509,10 @@ aoa_hid_end:
sc_hid_keyboard_destroy(&s->keyboard_hid);
hid_keyboard_initialized = false;
}
if (hid_mouse_initialized) {
sc_hid_mouse_destroy(&s->mouse_hid);
hid_mouse_initialized = false;
}
}
if (use_hid_keyboard && !hid_keyboard_initialized) {
@@ -498,9 +520,16 @@ aoa_hid_end:
"(-K/--hid-keyboard ignored)");
options->keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_INJECT;
}
if (use_hid_mouse && !hid_mouse_initialized) {
LOGE("Fallback to default mouse injection method "
"(-M/--hid-mouse ignored)");
options->mouse_input_mode = SC_MOUSE_INPUT_MODE_INJECT;
}
}
#else
assert(options->keyboard_input_mode != SC_KEYBOARD_INPUT_MODE_HID);
assert(options->mouse_input_mode != SC_MOUSE_INPUT_MODE_HID);
#endif
// keyboard_input_mode may have been reset if HID mode failed
@@ -510,8 +539,11 @@ aoa_hid_end:
kp = &s->keyboard_inject.key_processor;
}
sc_mouse_inject_init(&s->mouse_inject, &s->controller);
mp = &s->mouse_inject.mouse_processor;
// mouse_input_mode may have been reset if HID mode failed
if (options->mouse_input_mode == SC_MOUSE_INPUT_MODE_INJECT) {
sc_mouse_inject_init(&s->mouse_inject, &s->controller);
mp = &s->mouse_inject.mouse_processor;
}
if (!controller_init(&s->controller, s->server.control_socket,
acksync)) {