树莓派rock PI S 编译libjpeg

jpeglib下载地址：http://www.ijg.org/

下载

jpegsrc.v9d.tar.gz

wbyq@wbyq:~/work_pc$ cd jpeg-9d/
wbyq@wbyq:~/work_pc/jpeg-9d$ ./configure 
wbyq@wbyq:~/work_pc/jpeg-9d$ make
wbyq@wbyq:~/work_pc/jpeg-9d$ sudo make install
[sudo] wbyq 的密码： 
make[1]: 进入目录“/home/wbyq/work_pc/jpeg-9d”
 /bin/mkdir -p '/usr/local/lib'
 /bin/bash ./libtool   --mode=install /usr/bin/install -c   libjpeg.la '/usr/local/lib'
libtool: install: /usr/bin/install -c .libs/libjpeg.so.9.4.0 /usr/local/lib/libjpeg.so.9.4.0
libtool: install: (cd /usr/local/lib && { ln -s -f libjpeg.so.9.4.0 libjpeg.so.9 || { rm -f libjpeg.so.9 && ln -s libjpeg.so.9.4.0 libjpeg.so.9; }; })
libtool: install: (cd /usr/local/lib && { ln -s -f libjpeg.so.9.4.0 libjpeg.so || { rm -f libjpeg.so && ln -s libjpeg.so.9.4.0 libjpeg.so; }; })
libtool: install: /usr/bin/install -c .libs/libjpeg.lai /usr/local/lib/libjpeg.la
libtool: install: /usr/bin/install -c .libs/libjpeg.a /usr/local/lib/libjpeg.a
libtool: install: chmod 644 /usr/local/lib/libjpeg.a
libtool: install: ranlib /usr/local/lib/libjpeg.a
libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/sbin" ldconfig -n /usr/local/lib
----------------------------------------------------------------------
Libraries have been installed in:
   /usr/local/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the '-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the 'LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the 'LD_RUN_PATH' environment variable
     during linking
   - use the '-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to '/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
 /bin/mkdir -p '/usr/local/bin'
  /bin/bash ./libtool   --mode=install /usr/bin/install -c cjpeg djpeg jpegtran rdjpgcom wrjpgcom '/usr/local/bin'
libtool: install: /usr/bin/install -c .libs/cjpeg /usr/local/bin/cjpeg
libtool: install: /usr/bin/install -c .libs/djpeg /usr/local/bin/djpeg
libtool: install: /usr/bin/install -c .libs/jpegtran /usr/local/bin/jpegtran
libtool: install: /usr/bin/install -c rdjpgcom /usr/local/bin/rdjpgcom
libtool: install: /usr/bin/install -c wrjpgcom /usr/local/bin/wrjpgcom
/bin/bash /home/wbyq/work_pc/jpeg-9d/install-sh -d /usr/local/include
/usr/bin/install -c -m 644 jconfig.h /usr/local/include/jconfig.h
 /bin/mkdir -p '/usr/local/include'
 /usr/bin/install -c -m 644 jerror.h jmorecfg.h jpeglib.h '/usr/local/include'
 /bin/mkdir -p '/usr/local/share/man/man1'
 /usr/bin/install -c -m 644 cjpeg.1 djpeg.1 jpegtran.1 rdjpgcom.1 wrjpgcom.1 '/usr/local/share/man/man1'
 /bin/mkdir -p '/usr/local/lib/pkgconfig'
 /usr/bin/install -c -m 644 libjpeg.pc '/usr/local/lib/pkgconfig'
make[1]: 离开目录“/home/wbyq/work_pc/jpeg-9d”

编译时需要注意 如果

 gcc video_app.c yuv_to_jpeg.c -o app -ljpeg

编译成功后，运行app时出现

Wrong JPEG library version: library is 62, caller expects 90

说明系统中有两个版本的libjpeg库，笔者这里可能是opencv的导致的。

所以将编译改成这样，查找指定的lib 路径

gcc video_app.c yuv_to_jpg.c -o app /usr/local/lib/libjpeg.so

/usbcam_jpeg $ ./app /dev/video1
摄像头打开成功.
当前摄像头支持输出的图像格式如下:
<'YUYV'--'YUYV 4:2:2'>
摄像头实际输出的图像尺寸:x=1280,y=1024
当前摄像头支持YUV格式图像输出!
设置当前摄像头采集帧率: 1秒30帧
当前摄像头实际采集帧率: 2秒15帧
摄像头缓冲区申请的数量: 4
VideoDeviceInit=0
image_buffer[0]=76B4D000
图片名称:0.jpg,字节大小:62570
image_buffer[1]=768CD000
图片名称:1.jpg,字节大小:66057
image_buffer[2]=7664D000
图片名称:2.jpg,字节大小:69249
image_buffer[3]=763CD000
图片名称:3.jpg,字节大小:69249
image_buffer[0]=76B4D000
图片名称:4.jpg,字节大小:69249
image_buffer[1]=768CD000
图片名称:5.jpg,字节大小:70668
image_buffer[2]=7664D000
图片名称:6.jpg,字节大小:68325
image_buffer[3]=763CD000
图片名称:7.jpg,字节大小:68325
image_buffer[0]=76B4D000
图片名称:8.jpg,字节大小:68325
image_buffer[1]=768CD000
图片名称:9.jpg,字节大小:69971
image_buffer[2]=7664D000
图片名称:10.jpg,字节大小:68604
image_buffer[3]=763CD000
图片名称:11.jpg,字节大小:68604
image_buffer[0]=76B4D000
图片名称:12.jpg,字节大小:68604
image_buffer[1]=768CD000
图片名称:13.jpg,字节大小:73135
image_buffer[2]=7664D000

不再报错。

源码下载地址

    

        [lv]
    

    

        链接：https://pan.baidu.com/s/1zHJlNwOeKdQ8cZH7bIpXBw 
提取码：uvjx
[/lv]