From 9d221c19ca1c2d0756199e98fc85272ff5e5848d Mon Sep 17 00:00:00 2001
From: taorye <taorye@outlook.com>
Date: Thu, 12 Dec 2024 16:01:18 +0800
Subject: [PATCH 1/3] perf: enable parallel compression with `-T 0` for xz

---
 tools/os/gen_os.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/os/gen_os.sh b/tools/os/gen_os.sh
index 10d04c54..5114c3d1 100755
--- a/tools/os/gen_os.sh
+++ b/tools/os/gen_os.sh
@@ -148,7 +148,7 @@ cp -r "tmp/sys_builtin_files/boot/boards" "tmp/sys_builtin_files/maixapp/"
 ./update_img.sh tmp/sys_builtin_files "tmp/$os_version_str.img"
 
 # 9. xz 压缩镜像
-xz -zv "tmp/$os_version_str.img"
+xz -zv -T 0 "tmp/$os_version_str.img"
 
 echo "Complete: os file: tmp/$os_version_str.img.xz"
 

From 3ab93643ea1b3e8e0497ce4a59bd6c989707df30 Mon Sep 17 00:00:00 2001
From: taorye <taorye@outlook.com>
Date: Thu, 12 Dec 2024 17:37:12 +0800
Subject: [PATCH 2/3] fix: use `set -o pipefail` to exit while has error in
 processing

---
 tools/os/update_img.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/os/update_img.sh b/tools/os/update_img.sh
index 875f4798..26bd2dc6 100755
--- a/tools/os/update_img.sh
+++ b/tools/os/update_img.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+set -o pipefail
 
 source_dir=$1
 img_file=$2
@@ -34,7 +35,9 @@ $THISDIR/fuse2fs -o fakeroot -o offset=$PART_OFFSET $img_file $mount_root
 
 # copy root files
 echo "copy root files now"
-find $source_dir -mindepth 1 -maxdepth 1 -type d ! -name "boot" -exec cp -r {} $mount_root \;
+find $source_dir -mindepth 1 -maxdepth 1 -type d ! -name "boot" | while read -r dir; do
+    cp -r "$dir" "$mount_root"
+done
 sync
 echo "copy root files done"
 

From 08b450ad670e8c750e2f21b342a570ad31ee0af5 Mon Sep 17 00:00:00 2001
From: taorye <taorye@outlook.com>
Date: Mon, 16 Dec 2024 18:43:54 +0800
Subject: [PATCH 3/3] feat: add example for uvc streamer

---
 examples/vision/streaming/uvc_stream.py | 26 +++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 examples/vision/streaming/uvc_stream.py

diff --git a/examples/vision/streaming/uvc_stream.py b/examples/vision/streaming/uvc_stream.py
new file mode 100644
index 00000000..b0c1d42b
--- /dev/null
+++ b/examples/vision/streaming/uvc_stream.py
@@ -0,0 +1,26 @@
+from maix import camera, display, app, time, uvc
+
+cam = camera.Camera(640, 360)   # Manually set resolution
+                                # | 手动设置分辨率
+# disp = display.Display()        # MaixCAM default is 522x368
+                                # | MaixCAM 默认是 522x368
+
+uvcs = uvc.UvcStreamer(0)
+# uvcs.use_mjpg(1) for mjpg or yuyv default without it
+# uvcs.use_mjpg(1) 是为了刷 mjpg 通道，不添加这一行默认是 yuyv 通道
+uvcs.use_mjpg(1)
+
+while not app.need_exit():
+    # time.fps_start()          # Manually set fps calculation start point, comment here mean last time fps() call is start
+                                # | 动设置帧率（FPS）计算开始点，这里注释了表示上一次 fps 函数即是开始
+    img = cam.read()            # Get one frame from camera, img is maix.image.Image type object
+                                # | 从摄像头获取一帧图像，img 是 maix.image.Image 类型的对象
+    # disp.show(img)              # Show image to screen
+                                # | 将图像显示到屏幕
+    uvcs.show(img)
+
+    fps = time.fps()            # Calculate FPS between last time fps() call and this time call.
+                                # | 计算两次 fps 函数调用之间的帧率
+    print(f"time: {1000/fps:.02f}ms, fps: {fps:.02f}") # print FPS in console
+                                                       # | 在终端打印帧率（FPS）
+