mjpg-stream移植到FL2440平台

前言：

首先说明mjpg-stream是基于uvc和libjpeg的，所以你的内核必须有UVC驱动，而库里必须要有libjpeg，这是前提。所以假设你UVC弄好了，我们从移植libjpeg库开始。

其依据是：

在mjpg-streamer的README中有这样的话：

In case of error:

39 * the input plugin “input_uvc.so” depends on libjpeg, make sure it is installed.

40

41 Dependencies for the input plugin “input_uvc.so”:

42 * libjpeg

43 * recent Linux-UVC driver (newer then revision #170)

44

45 Dependencies for the output plugin “output_autofocus.so”:

46 * libmath

libjpeg库安装：

1. 下载libjpeg源码包

2. 解压配置编译及安装：

anzyelay@ubuntu:arm$tar xvf jpegsrc.v8b.tar.gz
anzyelay@ubuntu:arm$cd jpeg-8b
anzyelay@ubuntu:jpeg-8b$./configure --prefix=(安装目录) --host=arm-none-linux-gnueabi
anzyelay@ubuntu:jpeg-8b$make
anzyelay@ubuntu:jpeg-8b$make install

安装完后在安装目录下有4个目录 ./lib ./include ./bin ./share

3.拷贝动态库至开发板根系统目录lib/下

anzyelay@ubuntu:libjpeg_install$ cp lib/*.so* ../myrootfs/lib/ -av
`lib/libjpeg.so' -> `../myrootfs/lib/libjpeg.so'
`lib/libjpeg.so.8' -> `../myrootfs/lib/libjpeg.so.8'
`lib/libjpeg.so.8.0.2' -> `../myrootfs/lib/libjpeg.so.8.0.2'

mjpg-stream的移植：

1.下载mjpg-stream源码

2.解压配置编译及安装

解压

anzyelay@ubuntu:arm$ unzip mjpg-streamer-code-182.zip
anzyelay@ubuntu:arm$ cd mjpg-streamer-code-182/
anzyelay@ubuntu:mjpg-streamer-code-182$ ls
doc           mjpg-streamer               udp_client
mjpeg-client  mjpg-streamer-experimental  uvc-streamer

我们用的是mjpg-streamer,所以只编译这个就好，进入目录

anzyelay@ubuntu:mjpg-streamer-code-182$ cd mjpg-streamer
anzyelay@ubuntu:mjpg-streamer$ ls
CHANGELOG  Makefile         mjpg_streamer.h  README   start.sh  utils.c  www
LICENSE    mjpg_streamer.c  plugins          scripts  TODO      utils.h

这里以经有Makefile文件了，所以只需要我们更改编译工具 CC就OK,将所有Makefile中的CC替换成arm-linux-gcc

anzyelay@ubuntu:mjpg-streamer$ grep 'CC = gcc' -rl . | xargs sed -i "s/CC = gcc/CC=arm-linux-gcc/g"

由于“input_uvc.so” depends on libjpeg，所以需要更改./plugin/input_uvc/Makefile文件中的库链接和头文件路径，增加两点：

1.CFLAGS += -I /Libjpeg安装目录/include

2.LFLAGS += -L /(Libjpeg安装目录)/lib

anzyelay@ubuntu:mjpg-streamer$ cd plugins/input_uvc/
anzyelay@ubuntu:input_uvc$ vi Makefile

cat Makefile增加的语句如下：

CFLAGS += -I /home/anzyelay/Desktop/arm/libjpeg_install/include#anzyelay add

LFLAGS += -L /home/anzyelay/Desktop/arm/libjpeg_install/lib#anzyelay add

如果要用到make install命令.则需要指明安装路径，修改顶层的Makefile中的DESTDIR变量即可，否则默认安装在/usr/local下。如下：

# specifies where to install the binaries after compilation

# to use another directory you can specify it with:

# $ sudo make DESTDIR=/some/path install

DESTDIR =/home/anzyelay/Desktop/arm/myrootfs/usr/local

回到mjpg-streamer执行编译命令

anzyelay@ubuntu:mjpg-streamer$ make clean all

当我用make install时会出现

is not a directory: No such file or directory

的错误，查看了下安装目录发现连./bin都是可执行文件而不是目录，自己手动mkdir bin lib后再安装就OK了。

anzyelay@ubuntu:local$ mkdir bin lib
anzyelay@ubuntu:mjpg-streamer$ make install
install --mode=755 mjpg_streamer /home/anzyelay/Desktop/arm/myrootfs/usr/local/bin
install --mode=644 input_uvc.so output_file.so output_udp.so output_http.so input_testpicture.so input_file.so /home/anzyelay/Desktop/arm/myrootfs/usr/local/lib/
install --mode=755 -d /home/anzyelay/Desktop/arm/myrootfs/usr/local/www
install --mode=644 -D www/* /home/anzyelay/Desktop/arm/myrootfs/usr/local/www
anzyelay@ubuntu:local$ ls
bin  lib  www

3.拷贝库和可执行文件至开发板中

前期实验推荐拷贝到/usr/local/下，并修改环境配置，在/etc/profile加入下面两句：

export PATH=/usr/local/bin:$PATH

#下面一句是指定动态库的搜索目录

export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH

将今后要移植的动态库都放到/usr/local/lib下，测试OK稳定了就可以放到/lib下了，这样如果有问题也不会覆盖了根目录下的库。

将所有动态库文件*.so传到开发板的库目录下，将执行文件mjpg_streamer也传到开发板上。如果是make install了则直接将 bin/，lib/和www/拷到开发板对应目录就行，要移动的文件如下：

[root@bst:/]# ls usr/local/ -R
usr/local/:
bin  lib  www

usr/local/bin:
mjpg_streamer

usr/local/lib:
input_file.so         input_uvc.so          output_http.so
input_testpicture.so  output_file.so        output_udp.so

www目录也可不需要了。

4. 测试：

插入摄像头检查：

[root@bst:/]# ls dev/video*
dev/video0

执行mjpg_streamer 命令：

[root@bst:/]# mjpg_streamer -i "input_uvc.so" -o "output_http.so"

成功后如下：

[root@bst:/]# mjpg_streamer -i "input_uvc.so" -o "output_http.so"MJPG-streamer [1125]: starting application
MJPG Streamer Version: svn rev: exported
MJPG-streamer [1125]: MJPG Streamer Version: svn rev: exported
i: Using V4L2 device.: /dev/video0
MJPG-streamer [1125]: Using V4L2 device.: /dev/video0
i: Desired Resolution: 640 x 480
MJPG-streamer [1125]: Desired Resolution: 640 x 480
i: Frames Per Second.: 5
MJPG-streamer [1125]: Frames Per Second.: 5
i: Format............: MJPEG
MJPG-streamer [1125]: Format............: MJPEG

Adding control for Pan (relative)
Control exists: File exists
Adding control for Tilt (relative)
Control exists: File exists
Adding control for Pan Reset
Control exists: File exists
Adding control for Tilt Reset
Control exists: File exists
Adding control for Pan/tilt Reset
Control exists: File exists
Adding control for Focus (absolute)
Control exists: File exists
mapping control for Pan (relative)
Mapping exists: File exists
mapping control for Tilt (relative)
Mapping exists: File exists
mapping control for Pan Reset
Mapping exists: File exists
mapping control for Tilt Reset
Mapping exists: File exists
mapping control for Pan/tilt Reset
Mapping exists: File exists
mapping control for Focus (absolute)
Mapping exists: File exists
mapping control for LED1 Mode
Mapping exists: File exists
mapping control for LED1 Frequency
Mapping exists: File exists
mapping control for Disable video processing
Mapping exists: File exists
mapping control for Raw bits per pixel
Mapping exists: File exists
o: www-folder-path...: disabled
MJPG-streamer [1125]: www-folder-path...: disabled
o: HTTP TCP port.....: 8080
MJPG-streamer [1125]: HTTP TCP port.....: 8080
o: username:password.: disabled
MJPG-streamer [1125]: username:password.: disabled
o: commands..........: enabled
MJPG-streamer [1125]: commands..........: enabled
MJPG-streamer [1125]: starting input plugin input_uvc.so
MJPG-streamer [1125]: starting output plugin: output_http.so (ID: 00)

在IE地址栏输入如下命令：

192.168.10.110:8080/?action=stream

其中ip地址是你开发板的地址，如果要静止的图

192.168.10.110:8080/?action=snapshot

说明：

我的uvc摄像头输出格式是MJPEG的，所以用上面的命令可以出图，但如果输出格式是YUV不支持MJPEG则要在input_uvc.so插件里加入-y的选项，否则出错如下：

i: Format............: MJPEG
MJPG-streamer [1013]: Format............: MJPEG

Unable to set format: 1196444237 res: 176x144
Init v4L2 failed !! exit fatal
i: init_VideoIn failed
MJPG-streamer [1013]: init_VideoIn failed

没有插入UVC摄像头时出错如下：

ERROR opening V4L interface: No such file or directory
Init v4L2 failed !! exit fatal
i: init_VideoIn failed
MJPG-streamer [1192]: init_VideoIn failed

但我找了个只支持yuv输出的摄像头时，使用

[root@bst:/]# mjpg_streamer -i "input_uvc.so -y" -o "output_http.so"

终端显示是正常的在starting中：

MJPG-streamer [1014]: starting input plugin input_uvc.so
MJPG-streamer [1014]: starting output plugin: output_http.so (ID: 00)

但以IE中查看时一直是显示transferring data，不能显示图片，goolge了下找到这篇文章：点我查看

分辩率太高，传输不过来，调低分辨率就行.看来应该是传输限制

[root@bst:/]# mjpg_streamer -i "input_uvc.so -r 176x144 --fps 10 -q 80" -o "output_http.so -w /usr/local/www"

mjpg_streamer命令说明：

使用命令查看帮助信息：mjpg_streamer -h

mjpg_streamer -i “< input-plugin.so > [-opt] ” -o “< output-plugin.so > [-opt]” [ -h/v/b ]

-i的opt参数说明：设置输入捕获的参数

-d：(device)uvc设备节点

-r :（resolutions）视频捕获的分辨率，可以是：QSIF QCIF CGA QVGA CIF VGA SVGA XGA SXGA

或者直接写如： 640x480

-f :frames per second

-y :enable YUYV format and disable MJPEG mode

-q :图像压缩质量百分比，选中了此，则默认开启-y。

-m:drop frames smaller then this limit, useful

if the webcam produces small-sized garbage frames

may happen under low light conditions

-n :do not initalize dynctrls of Linux-UVC driver

-l :switch the LED “on”, “off”, let it “blink” or leave

it up to the driver using the value “auto”

-o的opt参数说明：设置HTTP输出参数

可选opt有：

-w : 指定www目录

-p：http服务的tcp port

-c：ie访问时需要用户名和密码 “-c username:password”

-n：disable execution of commands

input-plugin.so,output-plugin.so插件如果找不到，则可通过 export LD_LIBRARY_PATH=plugins路径设定摸索目录，也可以使用完整路径如下

mjpg_streamer -i "/path/to/modules/input_uvc.so"