usb摄像头驱动的移植并在网页上查看视频信息

【usb摄像头驱动的移植】

常见的usb摄像头有两种格式：YUV,GSPCA 格式

YUV格式：不经压缩的视频GSPCA格式：视频经过了压缩

1.如果摄像头是YUV格式：

通用的移植步骤是：

make menuconfig

Device Drivers --->

<*> Multimedia support --->

[*] Cameras/video grabbers support

[*] Media USB Adapters --->

< *> USB Video Class (UVC) (NEW)

2.视频通过一张一张图片连续播放得到视频信息，每秒播放24帧图像会得到视频信息

3.添加摄像头驱动(GSPCA)

1.将摄像头插入到pc电脑，让pc电脑去识别摄像头。

将得到的详细的硬件信息是:

V(vendor)ID: 0AC8 PID:303B

2.在内核的源码中搜索VID或者PID.

grep "303b" * ./* -nR

搜索结果：drivers/media/usb/gspca/zc3xx.c:6986: {USB_DEVICE(0x0ac8, 0x303b)},

425 config USB_GSPCA_ZC3XX

426 tristate "ZC3XX USB Camera Driver"

427 depends on VIDEO_V4L2 && USB_GSPCA

说明要添加USB_GSPCA_ZC3XX VIDEO_V4L2 USB_GSPCA

3.在菜单中用/ 搜索USB_GSPCA

搜索结果：Symbol: USB_GSPCA [=n]

│

│Type : tristate

│Prompt: GSPCA based webcams

│Location:

│-> Device Drivers

│(1) -> Multimedia support (MEDIA_SUPPORT [=n])

│-> Media USB Adapters (MEDIA_USB_SUPPORT [=n])

│Defined at drivers/media/usb/gspca/Kconfig:1

│Depends on: USB [=y] && MEDIA_SUPPORT [=n] && MEDIA_USB_SUPPORT [=n]

4.根据搜索结果找到对应的驱动在菜单中选中添加：

make menuconfig

-> Device Drivers │

<*> Multimedia support --->

[*] Cameras/video grabbers support │

[*] Media USB Adapters --->

<*> GSPCA based webcams --->

< *> ZC3XX USB Camera Driver (NEW)

5.make uImage.

在开发板上：

会有如下提示信息：

[root@farsight ]# [ 33.740000] gspca_zc3xx 1-3.1:1.0: URB error -71, resubmitting

[ 33.765000] gspca_zc3xx 1-3.1:1.0: URB error -71, resubmittinggspca_zc3xx 1-3.1:1.0: URB error -71, resubmitting

[ 33.815000] gspca_zc3xx 1-3.1:1.0: URB error -71, resubmitting[ 33.820000] usb 1-3.1: USB disconnect, device number 3

[root@farsight ]# ls /dev/video0

ls: /dev/video0: No such file or directory

[root@farsight ]# [ 41.450000] usb 1-3.1: new full-speed USB device number 4 using exynos-ehci

[ 41.565000] gspca_main: gspca_zc3xx-2.14.0 probing 0ac8:303b

[ 42.555000] input: gspca_zc3xx as /devices/12580000.ehci/usb1/1-3/1-3.1/input/input2 [ 42.900000] random: nonblocking pool is initialized

驱动添加成功后产生/dev/video0：

[root@farsight ]# ls /dev/video0

/dev/video0说明驱动添加正确

【如果想查看视频信息】

查看视频的软件：mjpg_streamer

软件在运行的时候需要依赖于图片库，所以在移植视频的源码之前，先移植图片库

1.移植jpeg图片库的源码

1) 下载jpeg图片库的源码。jpeg源码包通过下面这个网址下载

/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 --host=arm-none-linux-gnueabi --prefix=/home/linux/jpeg

4)编译

make

5)安装

make install