Add Windows build support for libusb

Update README.md

README.md

@@ -207,6 +207,24 @@ scrcpy --crop 1224:1440:0:0   # 1224x1440 at offset (0,0)
 
 If `--max-size` is also specified, resizing is applied after cropping.
 
+#### USB HID over AOAv2
+
+Scrcpy can simulate a USB physical keyboard on Android to provide better input
+experience, you need to connect your device via USB, not wireless.
+
+However, due to some limitation of libusb and WinUSB driver, you cannot use HID
+over AOAv2 on Windows.
+
+Currently a USB serial number is needed to use HID over AOAv2.
+
+```bash
+scrcpy --serial XXXXXXXXXXXXXXXX # try HID first and fallback to inject
+scrcpy --serial XXXXXXXXXXXXXXXX --input-mode hid # try HID and exit if failed
+scrcpy --serial XXXXXXXXXXXXXXXX --input-mode inject # don't use HID
+```
+
+Serial number can be found by `adb get-serialno`.
+
 #### Lock video orientation
 
 

app/meson.build

@@ -65,7 +65,7 @@ if not get_option('crossbuild_windows')
     endif
 
 else
-    # TODO: add libusb dependency for windows.
+
     # cross-compile mingw32 build (from Linux to Windows)
     prebuilt_sdl2 = meson.get_cross_property('prebuilt_sdl2')
     sdl2_bin_dir = meson.current_source_dir() + '/../prebuilt-deps/' + prebuilt_sdl2 + '/bin'
@@ -93,8 +93,20 @@ else
         include_directories: include_directories(ffmpeg_include_dir)
     )
 
+    prebuilt_libusb = meson.get_cross_property('prebuilt_libusb')
+    libusb_bin_dir = meson.current_source_dir() + '/../prebuilt-deps/' + prebuilt_libusb + '/dll'
+    libusb_include_dir = '../prebuilt-deps/' + prebuilt_libusb + '/include'
+
+    libusb = declare_dependency(
+        dependencies: [
+            cc.find_library('libusb-1.0', dirs: libusb_bin_dir),
+        ],
+        include_directories: include_directories(libusb_include_dir)
+    )
+
     dependencies = [
         ffmpeg,
+        libusb,
         sdl2,
         cc.find_library('mingw32')
     ]

app/src/aoa_hid.c

@@ -1,6 +1,7 @@
 #include "util/log.h"
 
 #include <assert.h>
+#include <stdio.h>
 
 #include "aoa_hid.h"
 
@@ -108,6 +109,7 @@ aoa_open_usb_handle(libusb_device *device, libusb_device_handle **handle) {
 }
 
 bool aoa_init(struct aoa *aoa, const struct scrcpy_options *options) {
+    aoa->usb_context = NULL;
     aoa->usb_device = NULL;
     aoa->usb_handle = NULL;
     aoa->next_accessories_id = 0;
@@ -123,7 +125,7 @@ bool aoa_init(struct aoa *aoa, const struct scrcpy_options *options) {
         return false;
     }
 
-    libusb_init(NULL);
+    libusb_init(&aoa->usb_context);
 
     aoa->usb_device = aoa_find_usb_device(options->serial);
     if (!aoa->usb_device) {
@@ -313,6 +315,7 @@ void aoa_thread_join(struct aoa *aoa) {
 void aoa_destroy(struct aoa *aoa) {
     libusb_close(aoa->usb_handle);
     libusb_unref_device(aoa->usb_device);
+    libusb_exit(aoa->usb_context);
     sc_cond_destroy(&aoa->event_cond);
     sc_mutex_destroy(&aoa->mutex);
 }

app/src/aoa_hid.h

@@ -25,6 +25,7 @@ struct hid_event {
 struct hid_event_queue CBUF(struct hid_event, 64);
 
 struct aoa {
+    libusb_context *usb_context;
     libusb_device *usb_device;
     libusb_device_handle *usb_handle;
     sc_thread thread;

cross_win32.txt

@@ -18,3 +18,4 @@ endian = 'little'
 prebuilt_ffmpeg_shared = 'ffmpeg-4.3.1-win32-shared'
 prebuilt_ffmpeg_dev = 'ffmpeg-4.3.1-win32-dev'
 prebuilt_sdl2 = 'SDL2-2.0.16/i686-w64-mingw32'
+prebuilt_libusb = 'libusb-1.0.24/MinGW32'

cross_win64.txt

@@ -18,3 +18,4 @@ endian = 'little'
 prebuilt_ffmpeg_shared = 'ffmpeg-4.3.1-win64-shared'
 prebuilt_ffmpeg_dev = 'ffmpeg-4.3.1-win64-dev'
 prebuilt_sdl2 = 'SDL2-2.0.16/x86_64-w64-mingw32'
+prebuilt_libusb = 'libusb-1.0.24/MinGW64'

prebuilt-deps/Makefile

@@ -3,11 +3,14 @@
 	prepare-ffmpeg-dev-win32 \
 	prepare-ffmpeg-shared-win64 \
 	prepare-ffmpeg-dev-win64 \
+	prepare-libusb \
 	prepare-sdl2 \
 	prepare-adb
 
-prepare-win32: prepare-sdl2 prepare-ffmpeg-shared-win32 prepare-ffmpeg-dev-win32 prepare-adb
-prepare-win64: prepare-sdl2 prepare-ffmpeg-shared-win64 prepare-ffmpeg-dev-win64 prepare-adb
+LIBUSB_DIR := libusb-1.0.24
+
+prepare-win32: prepare-sdl2 prepare-ffmpeg-shared-win32 prepare-ffmpeg-dev-win32 prepare-libusb prepare-adb
+prepare-win64: prepare-sdl2 prepare-ffmpeg-shared-win64 prepare-ffmpeg-dev-win64 prepare-libusb prepare-adb
 
 prepare-ffmpeg-shared-win32:
 	@./prepare-dep https://github.com/Genymobile/scrcpy/releases/download/v1.16/ffmpeg-4.3.1-win32-shared.zip \
@@ -29,6 +32,17 @@ prepare-ffmpeg-dev-win64:
 		2e8038242cf8e1bd095c2978f196ff0462b122cc6ef7e74626a6af15459d8b81 \
 		ffmpeg-4.3.1-win64-dev
 
+prepare-libusb:
+	# libusb put all things under the root of 7z file, so we pass the last
+	# argument which means creating extract dir manually.
+	@./prepare-dep https://github.com/libusb/libusb/releases/download/v1.0.24/libusb-1.0.24.7z \
+		620cec4dbe4868202949294157da5adb75c9fbb4f04266146fc833eef85f90fb \
+		"$(LIBUSB_DIR)" \
+		1
+	# Our code expects include dir under architechture dir.
+	cp -a "$(LIBUSB_DIR)"/include "$(LIBUSB_DIR)"/MinGW32
+	cp -a "$(LIBUSB_DIR)"/include "$(LIBUSB_DIR)"/MinGW64
+
 prepare-sdl2:
 	@./prepare-dep https://libsdl.org/release/SDL2-devel-2.0.16-mingw.tar.gz \
 		2bfe48628aa9635c12eac7d421907e291525de1d0b04b3bca4a5bd6e6c881a6f \

prebuilt-deps/prepare-dep

@@ -3,6 +3,7 @@ set -e
 url="$1"
 sum="$2"
 dir="$3"
+create_extract_dir="$4"
 
 checksum() {
     local file="$1"
@@ -27,13 +28,32 @@ get_file() {
 
 extract() {
     local file="$1"
+    local create_extract_dir="$2"
     echo "Extracting $file..."
     if [[ "$file" == *.zip ]]
     then
-        unzip -q "$file"
+        if [[ -n "$create_extract_dir" ]]
+        then
+            unzip -q "$file" -d "$dir"
+        else
+            unzip -q "$file"
+        fi
     elif [[ "$file" == *.tar.gz ]]
     then
-        tar xf "$file"
+        if [[ -n "$create_extract_dir" ]]
+        then
+            tar xf "$file" --one-top-level="$dir"
+        else
+            tar xf "$file"
+        fi
+    elif [[ "$file" == *.7z ]]
+    then
+        if [[ -n "$create_extract_dir" ]]
+        then
+            7z x "$file" -o"$dir"
+        else
+            7z x "$file"
+        fi
     else
         echo "Unsupported file: $file"
         return 1
@@ -44,15 +64,16 @@ get_dep() {
     local url="$1"
     local sum="$2"
     local dir="$3"
+    local create_extract_dir="$4"
     local file="${url##*/}"
     if [[ -d "$dir" ]]
     then
         echo "$dir: found"
     else
         echo "$dir: not found"
         get_file "$url" "$file" "$sum"
-        extract "$file"
+        extract "$file" "$create_extract_dir"
     fi
 }
 
-get_dep "$url" "$sum" "$dir"
+get_dep "$url" "$sum" "$dir" "$create_extract_dir"

release.mk

@@ -99,6 +99,7 @@ dist-win32: build-server build-win32
 	cp prebuilt-deps/ffmpeg-4.3.1-win32-shared/bin/avformat-58.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/ffmpeg-4.3.1-win32-shared/bin/swresample-3.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/ffmpeg-4.3.1-win32-shared/bin/swscale-5.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp prebuilt-deps/libusb-1.0.24/MinGW32/dll/libusb-1.0.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/adb.exe "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinUsbApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
@@ -115,6 +116,7 @@ dist-win64: build-server build-win64
 	cp prebuilt-deps/ffmpeg-4.3.1-win64-shared/bin/avformat-58.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp prebuilt-deps/ffmpeg-4.3.1-win64-shared/bin/swresample-3.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp prebuilt-deps/ffmpeg-4.3.1-win64-shared/bin/swscale-5.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp prebuilt-deps/libusb-1.0.24/MinGW64/dll/libusb-1.0.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/adb.exe "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinUsbApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"