環境

主機環境：Ubuntu 12.04

核心版本：3.2.0-24-generic

主機工具鏈：arm-none-linux-gnueabi   version 4.3.2

交叉編譯jpeg庫

1.解壓原始碼

tar xvf jpegsrc.v8b.tar.gz

2.配置原始碼

cd jpeg-8b

./configure --prefix=/home/linux/arm/video/jpeg --host=arm-none-linux-gnueabi

3.編譯

make

4.安裝

make install

-----------------------------------------------------------------------------------------

這時候我的出現了問題：(輸入sudo make install)

[email protected]:~/workdir/jpeg-8b$ sudo make install

[sudo] password for linux:

make[1]: 正在進入目錄`/home/linux/workdir/jpeg-8b'

test -z "/home/linux/arm/video/jpeg/lib" || /bin/mkdir -p "/home/linux/arm/video/jpeg/lib"

 /bin/bash ./libtool   --mode=install /usr/bin/install -c   libjpeg.la '/home/linux/arm/video/jpeg/lib'

libtool: install: /usr/bin/install -c .libs/libjpeg.so.8.0.2 /home/linux/arm/video/jpeg/lib/libjpeg.so.8.0.2

libtool: install: (cd /home/linux/arm/video/jpeg/lib && { ln -s -f libjpeg.so.8.0.2 libjpeg.so.8 || { rm -f libjpeg.so.8 && ln -s libjpeg.so.8.0.2 libjpeg.so.8; }; })

libtool: install: (cd /home/linux/arm/video/jpeg/lib && { ln -s -f libjpeg.so.8.0.2 libjpeg.so || { rm -f libjpeg.so && ln -s libjpeg.so.8.0.2 libjpeg.so; }; })

libtool: install: /usr/bin/install -c .libs/libjpeg.lai /home/linux/arm/video/jpeg/lib/libjpeg.la

libtool: install: /usr/bin/install -c .libs/libjpeg.a /home/linux/arm/video/jpeg/lib/libjpeg.a

libtool: install: chmod 644 /home/linux/arm/video/jpeg/lib/libjpeg.a

libtool: install: arm-none-linux-gnueabi-ranlib /home/linux/arm/video/jpeg/lib/libjpeg.a

./libtool: line 950: arm-none-linux-gnueabi-ranlib: command not found

make[1]: *** [install-libLTLIBRARIES] 錯誤 127

make[1]:正在離開目錄`/home/linux/workdir/jpeg-8b'

make: *** [install-am] 錯誤 2

------------------------

分析：

但我發現arm-none-linux-gnueabi-ranlib是存在的，最後發現是因為root使用者的編譯鏈的路徑還沒啟用。

解決方法：直接進入root許可權，先用arm-linux-gcc –v檢視工具鏈是否可用，不行的話就source一下，然後再執行一次make install，問題解決。（這個錯誤告訴我們，安裝軟體或者編譯什麼的時候最好直接在root下進行！）

--------------------------------------------------------------------------------------------

5.拷貝

完成後會在你指定的目錄下（/home/linux/arm/video/jpeg）的/lib下生成庫檔案，使用的時候就把它們複製到開發板的/lib目錄下即可。（呆會mjpg-stream的編譯也需要用到）

交叉編譯mjpg-stream

1.解壓原始碼

#tar xvf mjpg-streamer-r63.tar.gz

2.修改原始碼

（1）修改Makefile

修改頂層Makefile檔案和所有子層Makefile檔案中的編譯工具項：

將：CC = gcc

改成： CC = arm-none-linux-gnueabi-gcc

（2）修改plugins/input_uvc/Makefile檔案

a.在第 16 行新增需要使用jpeg庫標頭檔案的路徑（交叉編譯jpeg庫時指定的安裝目錄）：

CFLAGS += -I/home/linux/arm/video/jpeg/include

b.在第 24 行新增編譯 input_uvc.so 所使用的庫檔案的路徑：

將：$(CC) $(CFLAGS) -ljpeg -o [email protected] input_uvc.c v4l2uvc.lo jpeg_utils.lo dynctrl.lo

改成：$(CC) $(CFLAGS) –ljpeg -L/home/linux/arm/video/jpeg/lib -o [email protected] input_uvc.c v4l2uvc.lo jpeg_utils.lo dynctrl.lo

（3）修改 plugins/input_uvc/v4l2uvc.c

a.在第 99 行 static int init_v4l2(struct vdIn *vd)函式內新增：

#if 1

struct v4l2_input inp;

inp.index = 0;

if (-1 == ioctl(vd->fd, VIDIOC_S_INPUT, &inp))

printf("VIDIOC_S_INPUT error\n");

#endif

b.在第 195 行 mmap 函式的引數中新增：

將vd->buf.length, PROT_READ, MAP_SHARED, vd->fd,

改成：vd->buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, vd->fd,

c.將下面的程式碼全部註釋掉：

struct v4l2_streamparm *setfps;

setfps = (struct v4l2_streamparm *) calloc(1, si

memset(setfps, 0, sizeof(struct v4l2_streamparm

setfps->type = V4L2_BUF_TYPE_VIDEO_CA

setfps->parm.capture.timeperframe.numerator =

setfps->parm.capture.timeperframe.denominato

ret = ioctl(vd->fd, VIDIOC_S_PARM, setfps);

3.編譯mjpg-stream原始碼

#make clean

#make -j2

------------------------------------------------------------------------------------------------

執行 make -j2 之後出現錯誤：

input_uvc.c: In function 'input_init':

input_uvc.c:275: error: invalid application of 'sizeof' to incomplete type 'struct vdIn'

input_uvc.c:280: error: invalid application of 'sizeof' to incomplete type 'struct vdIn'

input_uvc.c:291: warning: implicit declaration of function 'init_videoIn'

input_uvc.c:303: error: dereferencing pointer to incomplete type

input_uvc.c:308: warning: implicit declaration of function 'input_cmd'

input_uvc.c: In function 'input_run':

input_uvc.c:331: error: dereferencing pointer to incomplete type

input_uvc.c: In function 'input_cmd':

input_uvc.c:369: warning: implicit declaration of function 'v4l2ResetControl'

input_uvc.c:379: error: dereferencing pointer to incomplete type

input_uvc.c:411: error: dereferencing pointer to incomplete type

input_uvc.c:429: error: dereferencing pointer to incomplete type

input_uvc.c:448: error: dereferencing pointer to incomplete type

input_uvc.c:477: error: dereferencing pointer to incomplete type

input_uvc.c:495: error: dereferencing pointer to incomplete type

input_uvc.c:514: error: dereferencing pointer to incomplete type

input_uvc.c:523: warning: implicit declaration of function 'v4l2UpControl'

input_uvc.c:528: warning: implicit declaration of function 'v4l2DownControl'

input_uvc.c:566: warning: implicit declaration of function 'v4l2SetControl'

input_uvc.c: In function 'cam_thread':

input_uvc.c:676: warning: implicit declaration of function 'uvcGrab'

input_uvc.c:690: error: dereferencing pointer to incomplete type

input_uvc.c:704: error: dereferencing pointer to incomplete type

input_uvc.c:706: error: dereferencing pointer to incomplete type

input_uvc.c:706: warning: passing argument 1 of 'compress_yuyv_to_jpeg' from incompatible pointer type

input_uvc.c:710: warning: implicit declaration of function 'memcpy_picture'

input_uvc.c:710: error: dereferencing pointer to incomplete type

input_uvc.c:710: error: dereferencing pointer to incomplete type

input_uvc.c:728: error: dereferencing pointer to incomplete type

input_uvc.c:729: error: dereferencing pointer to incomplete type

input_uvc.c: In function 'cam_cleanup':

input_uvc.c:758: warning: implicit declaration of function 'close_v4l2'

input_uvc.c:759: error: dereferencing pointer to incomplete type

input_uvc.c:759: error: dereferencing pointer to incomplete type

----------------------------------------

解決方法：

在目錄plugins/input_uvc下的input_uvc.c裡增加標頭檔案#include。（也不知道是我複製過來的這份程式碼有問題還是所有的都是這樣，還沒有對照）

-------------------------------------------------------------------------------------------------

編譯成功後會在目錄下生成6個庫檔案，可以用命令 ls *so 檢視一下：

input_gspcav1.so      input_uvc.so         output_file.so

input_testpicture.so  output_autofocus.so  output_http.so

還有一個可執行檔案：mjpg-stream

4.拷貝（移植）

將生成的（6個）庫檔案複製到ARM板的/lib目錄下，將mjpg-stream複製到ARM板的/bin目錄下。還可以將www目錄複製到ARM板的目錄/www上做測試。

----------------------------------------------------------------------------------------------

尚未成功

5.測試

接上USB攝像頭，在開發板上執行：

mjpg_streamer -i "/lib/input_uvc.so -y" -o "/lib/output_http.so -w /www" 

還是？（mjpg_streamer -i "/mjpg/input_uvc.so -y" -o "/mjpg/output_http.so -w

192.168.100.191:8080" &）

然後再通過瀏覽器訪問：

http://192.168.100.191:8080/?action=snapshot （每次回車單張抓拍）

或者

http://192.168.100.191:8080/?action=stream (視訊流)

-----------------------------------------------------------------------------------------------