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 " [parameters]" -o | --output " [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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