基于linux-2.6.35的网络视频服务器移植

来源：互联网发布：部落冲突8本满科技数据编辑：程序博客网时间：2024/05/18 21:43

http://blog.csdn.net/shulianghe/article/details/8207710

作者：曹忠明,华清远见嵌入式学院讲师。

一、环境

主机环境：ubuntu 10.10
        目标机：FS2410(S3C2410)
        主机工具链：gcc-4.4.5
        交叉工具链：arm-none-linux-gnueabi-gcc-4.3.2
        摄像头：ZC301

二、移植过程

1、配置内核是内核支持芯片为ZC301的摄像头
        Make menuconfig
                Device Drivers --->
                        <*> Multimedia support --->
                                <*> Video For Linux
                                [*] Enable Video For Linux API 1 (DEPRECATED) (NEW)
                                [*] Video capture adapters (NEW) --->
                                        [*] V4L USB devices (NEW) --->
                                                <*> USB Video Class (UVC)
                                                [*] UVC input events device support (NEW)
                                        <*> USB ZC0301[P] webcam support (DEPRECATED)

2、重新编译内核

make zImage

通过上面两个步骤就可以驱动我们的摄像头了。但是这个驱动是基于V4l2的。以前基于 V4L的一些上层应用就不能用了，或需要做大量的修改！这里我们要实现网络视频的功能，以前都是用servfox这个网络视频服务器，但是这个服务器就是基于V4L的，我们如果想用的话就得对servfox的源码进行修改。这里我们选用另外一种方案mjpg-stream。

3、mjpg-stream的移植

关于mjpg-stream的资料大家可以在下面这个网址查看：http://sourceforge.net/apps/mediawiki/mjpg-streamer/index.php?title=Main_Page
mjpg-stream的移植需要jpeg的库，所以我们先移植jpeg的库

(1)jpeg库的移植

        1)jpeg源码包通过下面这个网址下载
                http://www.ijg.org/files/jpegsrc.v8b.tar.gz
                2)解压源码包
                tar xvf jpegsrc.v8b.tar.gz
                3)配置源码
                cd jpeg-8b
                ./configure --prefix=/home/linux/s3c2410-2.6.35/video/jpeg --host=arm-none-linux-gnueabi
                4)编译
                make
                5)安装
                make install
                6)拷贝库到文件系统中
                cp //home/linux/s3c2410-2.6.35/video/jpeg /lib/libjpeg.so.8 /source/rootfs/lib

(2)mjpg-stream的移植

        1)mjpg-stream源码包通过下面这个网址下载
                http://sourceforge.net/projects/mjpg-streamer/
                2)解压源码
                tar xvf mjpg-streamer-r63.tar.gz
                3)修改源码
                cd mjpg-streamer-r63
                修改顶层makefile及plugins目录中的各级makefile将所有
                CC=gcc
                修改为
                CC=arm-none-linux-gnueabi-gcc【arm-linux-gcc】

        修改plugins/input_uvc/Makfile
                修改
                CFLAGS += -O2 -DLINUX -D_GNU_SOURCE -Wall -shared -fPIC
                为
                CFLAGS += -O2 -DLINUX -D_GNU_SOURCE -Wall -shared -fPIC -I/home/linux/s3c2410-2.6.35/video/jpeg/include
                修改
                $(CC) $(CFLAGS) -ljpeg -o $@ input_uvc.c v4l2uvc.lo jpeg_utils.lo dynctrl.lo
                为
                $(CC) $(CFLAGS) -ljpeg -L/home/linux/s3c2410-2.6.35/video/jpeg/lib -o $@ input_uvc.c v4l2uvc.lo jpeg_utils.lo dynctrl.lo

         jpeg_utils.c:27: fatal error: jpeglib.h: No such file or directory
                4)编译
                make
                5)测试
                mkdir /source/rootfs/mjpg
                cp *.so /source/rootfs/mjpg
                cp mjpg-stream /source/rootfs/bin

把*.so www文件夹可执行文件mjpg_streamer start.sh复制到一个新建目录mjpg，然后把mjpg复制到开发板

mkdir ./mjpg

cp *.so start.sh ./mjpg

cp -r www ./mjpg

        打开开开发板运行
                mjpg_streamer -i "/mjpg/input_uvc.so" -o "/mjpg/output_http.so -w /www"
                在源码目录下有start.sh,这个脚本里有一些mjpg-stream的使用方法及说明

        打开一个网页输入下面地址就能够看到一个视频(开发板的IP为192.168.1.202)：
                http://192.168.1.202:8080/?action=stream
                打开一个网页输入下面地址就能够看到一个静态图片：
                http://192.168.1.202:8080/?action=snapshot
                6)在mjpg源码下有一个www的目录，这个一个网络使用mjpg的实例，结合web服务器(boa)可以实现一些其他相关功能。

*************************************************************************************************************************************************************************************************************************
*************************************************************************************************************************************************************************************************************************
过程记录：
下载的 mjpg-streamer-r63.tar.gz
编译完成
执行命令 mjpg_streamer 出现下面错误
MJPG-streamer [525]: starting application
MJPG Streamer Version.: 2.0
MJPG-streamer [525]: MJPG Streamer Version.: 2.0

ERROR: could not find input plugin
MJPG-streamer [525]: ERROR: could not find input plugin

       Perhaps you want to adjust the search path with:
MJPG-streamer [525]:        Perhaps you want to adjust the search path with:

       # export LD_LIBRARY_PATH=/path/to/plugin/folder
MJPG-streamer [525]:        # export LD_LIBRARY_PATH=/path/to/plugin/folder

       dlopen: input_uvc.so: cannot open shared object file: No such file or directory
MJPG-streamer [525]:        dlopen: input_uvc.so: cannot open shared object file: No such。。。
原因及解决办法
这是找不到共享造成的。Linux和windows不一样，不会在可执行文件所在的目录搜索共享库文件。解决办法：敲入如下命令：export LD_LIBRARY_PATH=/mjpg-streamer-r63:$LD_LIBRARY_PATH (我的共享库.so文件时放在/mjpg-streamer-r63目录里)，设定共享库的搜索路径就可以了！

执行命令
./mjpg_streamer -o "output_http.so -w ./www" -i "input_uvc.so -y -d /dev/video0"
执行成功

输入网址
http://192.168.1.6:8080/?action=index.html

注意命令参考start.sh，如
mkdir pics
./mjpg_streamer -o "output_http.so -w `pwd`/www" -o "output_file.so -f pics -d 15000"
每隔15秒存储一张图片。

#该命令由于程序默认是MJPG的，故只有MJPG摄像头有用，对输出yuyv格式的摄像头无效
./mjpg_streamer -o "output_http.so -w ./www"

#该命令参数-y指定yuyv摄像头，enable YUYV format and disable MJPEG mode
#./mjpg_streamer -o "output_http.so -w ./www" -i "input_uvc.so -y -d /dev/video0"

-----------------------------------------------------------------------
-----------------------------------------------------------------------
命令
./mjpg_streamer --help

Usage: ./mjpg_streamer
-i | --input "<input-plugin.so> [parameters]"
-o | --output "<output-plugin.so> [parameters]"
[-h | --help ]........: display this help
[-v | --version ].....: display version information
[-b | --background]...: fork to the background, daemon mode
-----------------------------------------------------------------------
Example #1:
To open an UVC webcam "/dev/video1" and stream it via HTTP:
./mjpg_streamer -i "input_uvc.so -d /dev/video1" -o "output_http.so"
-----------------------------------------------------------------------
Example #2:
To open an UVC webcam and stream via HTTP port 8090:
./mjpg_streamer -i "input_uvc.so" -o "output_http.so -p 8090"
-----------------------------------------------------------------------
Example #3:
To get help for a certain input plugin:
./mjpg_streamer -i "input_uvc.so --help"
-----------------------------------------------------------------------
In case the modules (=plugins) can not be found:
* Set the default search path for the modules with:
   export LD_LIBRARY_PATH=/path/to/plugins,
* or put the plugins into the "/lib/" or "/usr/lib" folder,
* or instead of just providing the plugin file name, use a complete
   path and filename:
   ./mjpg_streamer -i "/path/to/modules/input_uvc.so"
-----------------------------------------------------------------------
-----------------------------------------------------------------------
命令
./mjpg_streamer -i "input_uvc.so --help"
MJPG-streamer [1177]: starting application
MJPG Streamer Version.: 2.0
MJPG-streamer [1177]: MJPG Streamer Version.: 2.0

---------------------------------------------------------------
Help for input plugin..: UVC webcam grabber
---------------------------------------------------------------
The following parameters can be passed to this plugin:

[-d | --device ].......: video device to open (your camera)
[-r | --resolution ]...: the resolution of the video device,
                          can be one of the following strings:
                          QSIF QCIF CGA QVGA CIF VGA
                          SVGA XGA SXGA
                          or a custom value like the following
                          example: 640x480
[-f | --fps ]..........: frames per second
[-y | --yuv ]..........: enable YUYV format and disable MJPEG mode
[-q | --quality ]......: JPEG compression quality in percent
                          (activates YUYV format, disables MJPEG)
[-m | --minimum_size ].: drop frames smaller then this limit, useful
                          if the webcam produces small-sized garbage frames
                          may happen under low light conditions
[-n | --no_dynctrl ]...: do not initalize dynctrls of Linux-UVC driver
[-l | --led ]..........: switch the LED "on", "off", let it "blink" or leave
                          it up to the driver using the value "auto"

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