Camera | 3.瑞芯微平臺(tái)MIPI攝像頭常用調(diào)試命令

Camera | 1.Camera基礎(chǔ)知識(shí)

Camera | 2.MIPI、CSI基礎(chǔ)

前面2篇我們講解了camera的一些基礎(chǔ)概念和知識(shí)。

本文主要講述在瑞芯微平臺(tái)上攝像頭開發(fā)常用的調(diào)試命令。

0、環(huán)境

soc??:?rk3568???
board:?EVB1-DDR4-V10
軟??件：Android?11
Linux：4.19.232
Camera:ov13850

1. v4l2-utils工具包

v4l-utils工具是由Linux維護(hù)的V4L2開發(fā)工具包。

它提供了一套用于配置V4L2子設(shè)備屬性的V4L2和媒體框架相關(guān)工具,測(cè)試V4L2設(shè)備,并提供開發(fā)庫(kù),如libv4l2等等。

v4l-utils工具包主要包含兩個(gè)常用工具，分別是media-ctl、v4l2-ctl

瑞芯微的SDK在Buildroot固件中，已經(jīng)編譯好了v4l2-utils軟件包里面的工具（Android通常默認(rèn)支持）。

ubuntu系統(tǒng)安裝方法：

peng@ubuntu:~$?sudo?apt?install?v4l-utils

2. media-ctl

media-ctl是v4l2-utils包中的一個(gè)工具，主要用來查看、配置Media Framework的各Entity的信息，如格式、裁剪、鏈接使能等。

V4l2-ctl 工具則是針對(duì)/dev/video0，/dev/video1 等 video設(shè)備，它在 video 設(shè)備上進(jìn)行 set_fmt，reqbuf(申請(qǐng)buf)，qbuf(送buf回隊(duì)列)，dqbuf(從隊(duì)列取出buf)，stream_on，stream_off 等一系列操作。

?n為4的倍數(shù)(0,1,2,3…)
?/dev/videon+0：視頻輸出?SP主通道
?/dev/videon+1：視頻輸出?MP自身通道
?/dev/videon+2：3A統(tǒng)計(jì)
?/dev/videon+3：3A參數(shù)設(shè)置

1）找到video設(shè)備

拓?fù)浣Y(jié)構(gòu)中有多個(gè)的Entity，一些是sub device，一些是video device。前者對(duì)應(yīng)的設(shè)備節(jié)點(diǎn)是/dev/v4l-subdev，后者對(duì)應(yīng)的是/dev/video。多個(gè)的video device中，最常關(guān)注的是哪個(gè)設(shè)備可以輸出圖像。

$?media-ctl?-d?/dev/media0?-e?"rkisp_selfpath"
/dev/video1
$?media-ctl?-d?/dev/media0?-e?"rkisp_mainpath"
/dev/video0

上面兩個(gè)命令分別顯示出/dev/media0這個(gè)鏈路中，RKISP的SP及MP節(jié)點(diǎn)的設(shè)備路徑。RKISP有兩個(gè)視頻輸出設(shè)備，它們都能輸出圖像。

2）顯示拓?fù)浣Y(jié)構(gòu)

使用以下命令可以顯示拓?fù)浣Y(jié)構(gòu)：

$?media-ctl?-p?-d?/dev/media0

主要關(guān)注的是有沒有找到Sensor的Entity。如果沒有找到Sensor的Entity，說明Sensor注冊(cè)有問題，請(qǐng)按FAQ文檔排查。

例如，開發(fā)板上接上ov13850攝像頭后可以看到如下的輸出：

rk3568_r:/?#?media-ctl?-d?/dev/media0?-p???????????????
media-ctl?-d?/dev/media0?-p????????????????????????????
Opening?media?device?/dev/media0???????????????????????
Enumerating?entities???????????????????????????????????
Found?13?entities??????????????????????????????????????
Enumerating?pads?and?links?????????????????????????????
Media?controller?API?version?0.0.255???????????????????
???????????????????????????????????????????????????????
Media?device?information???????????????????????????????
------------------------???????????????????????????????
driver??????????rkisp-vir0?????????????????????????????
model???????????rkisp0?????????????????????????????????
serial?????????????????????????????????????????????????
bus?info???????????????????????????????????????????????
hw?revision?????0x0????????????????????????????????????
driver?version??0.0.255????????????????????????????????
???????????????????????????????????????????????????????
Device?topology????????????????????????????????????????
-?entity?1:?rkisp-isp-subdev?(4?pads,?7?links)?????????
????????????type?V4L2?subdev?subtype?Unknown???????????
????????????device?node?name?/dev/v4l-subdev0??????????
????????pad0:?Sink?????????????????????????????????????
????????????????[fmt:SBGGR10/2112x1568?????????????????
?????????????????crop.bounds:(0,0)/2112x1568???????????
?????????????????crop:(0,0)/2112x1568]?????????????????
????????????????<-?"rkisp-csi-subdev":1?[ENABLED]??????
????????????????<-?"rkisp_rawrd0_m":0?[]???????????????
????????????????<-?"rkisp_rawrd2_s":0?[]???????????????
????????pad1:?Sink?????????????????????????????????????
????????????????<-?"rkisp-input-params":0?[ENABLED]????
????????pad2:?Source???????????????????????????????????
????????????????[fmt:YUYV2X8/2112x1568?????????????????
?????????????????crop.bounds:(0,0)/2112x1568???????????
?????????????????crop:(0,0)/2112x1568]?????????????????
????????????????->?"rkisp_mainpath":0?[ENABLED]????????
????????????????->?"rkisp_selfpath":0?[ENABLED]????????
????????pad3:?Source???????????????????????????????????
????????????????->?"rkisp-statistics":0?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?6:?rkisp-csi-subdev?(6?pads,?5?links)?????????
????????????type?V4L2?subdev?subtype?Unknown???????????
????????????device?node?name?/dev/v4l-subdev1??????????
????????pad0:?Sink?????????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????<-?"rockchip-csi2-dphy0":1?[ENABLED]???
????????pad1:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????->?"rkisp-isp-subdev":0?[ENABLED]??????
????????pad2:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????->?"rkisp_rawwr0":0?[ENABLED]??????????
????????pad3:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????pad4:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????->?"rkisp_rawwr2":0?[ENABLED]??????????
????????pad5:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????->?"rkisp_rawwr3":0?[ENABLED]??????????
???????????????????????????????????????????????????????
-?entity?13:?rkisp_mainpath?(1?pad,?1?link)????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video0??????????????
????????pad0:?Sink?????????????????????????????????????
????????????????<-?"rkisp-isp-subdev":2?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?19:?rkisp_selfpath?(1?pad,?1?link)????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video1??????????????
????????pad0:?Sink?????????????????????????????????????
????????????????<-?"rkisp-isp-subdev":2?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?25:?rkisp_rawwr0?(1?pad,?1?link)??????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video2??????????????
????????pad0:?Sink?????????????????????????????????????
????????????????<-?"rkisp-csi-subdev":2?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?31:?rkisp_rawwr2?(1?pad,?1?link)??????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video3??????????????
????????pad0:?Sink?????????????????????????????????????
????????????????<-?"rkisp-csi-subdev":4?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?37:?rkisp_rawwr3?(1?pad,?1?link)??????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video4??????????????
????????pad0:?Sink?????????????????????????????????????
????????????????<-?"rkisp-csi-subdev":5?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?43:?rkisp_rawrd0_m?(1?pad,?1?link)????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video5??????????????
????????pad0:?Source???????????????????????????????????
????????????????->?"rkisp-isp-subdev":0?[]?????????????
???????????????????????????????????????????????????????
-?entity?49:?rkisp_rawrd2_s?(1?pad,?1?link)????????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video6??????????????
????????pad0:?Source???????????????????????????????????
????????????????->?"rkisp-isp-subdev":0?[]?????????????
???????????????????????????????????????????????????????
-?entity?55:?rkisp-statistics?(1?pad,?1?link)??????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video7??????????????
????????pad0:?Sink?????????????????????????????????????
????????????????<-?"rkisp-isp-subdev":3?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?61:?rkisp-input-params?(1?pad,?1?link)????????
?????????????type?Node?subtype?V4L?????????????????????
?????????????device?node?name?/dev/video8??????????????
????????pad0:?Source???????????????????????????????????
????????????????->?"rkisp-isp-subdev":1?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?67:?rockchip-csi2-dphy0?(2?pads,?2?links)?????
?????????????type?V4L2?subdev?subtype?Unknown??????????
?????????????device?node?name?/dev/v4l-subdev2?????????
????????pad0:?Sink?????????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????<-?"m00_b_ov13850?4-0010":0?[ENABLED]??
????????pad1:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????->?"rkisp-csi-subdev":0?[ENABLED]??????
???????????????????????????????????????????????????????
-?entity?70:?m00_b_ov13850?4-0010?(1?pad,?1?link)??????
?????????????type?V4L2?subdev?subtype?Sensor???????????
?????????????device?node?name?/dev/v4l-subdev3?????????
????????pad0:?Source???????????????????????????????????
????????????????[fmt:SBGGR10/4224x3136]????????????????
????????????????->?"rockchip-csi2-dphy0":0?[ENABLED]???

從entity70信息中可以看到：

該Entity完整的名稱是：m00_b_ov13850 4-0010它是一個(gè)V4L2 subdev(Sub-Device) Sensor它對(duì)應(yīng)的節(jié)點(diǎn)是/dev/v4l-subdev3，應(yīng)用程序（如v4l2-ctl）可以打開它，并進(jìn)行配置它僅有一個(gè)輸出（Source）節(jié)點(diǎn)，記為pad0它的輸出格式是[fmt:SBGGR10/4224x3136]，其中SBGGR10是一種mbus-code的簡(jiǎn)稱它的Source pad0 鏈接到"rockchip-csi2-dphy0"的pad0，并且當(dāng)前的狀態(tài)是 ENABLED。

拓?fù)浣Y(jié)構(gòu)圖如下：【后面文章會(huì)詳細(xì)講解該結(jié)構(gòu)圖，請(qǐng)收藏本系列文章】

3）修改Entity的format、size

舉例一，ov3850攝像頭支持多個(gè)分辨率的輸出，默認(rèn)為1920x1080?，F(xiàn)將輸出分辨率改為640x480：

media-ctl?-d/dev/media0
--set-v4l2'?"m00_b_ov13850?4-0010":0[fmt:SBGGR10/640x480]'

修改ov3850輸出后，rkisp-isp-subdev的大小及video device crop也相應(yīng)要修改。因?yàn)楹蠹?jí)的大小不能大于前級(jí)的大小。

~/>$?media-ctl?-d/dev/media0?--set-v4l2?'?"rkisp-isp-subdev":0[fmt:SBGGR10/640x480]'
~/>$?media-ctl?-d/dev/media0?--set-v4l2?'?"rkisp-isp-subdev":0[crop:?(0,?0)/640x480]'
~/>$?media-ctl?-d/dev/media0?--set-v4l2?'?"rkisp-isp-subdev":2[crop:?(0,?0)/640x480]'
~/>$?v4l2-ctl?-d/dev/video0
--set-selection=target=crop,?top=0,?left=0,?width=640,?height=480

3. v4l2-ctl

v4l2-ctl的幫助信息查看：

[root@RK356X:~]#?v4l2-ctl?-h
General/Common?options:
--all???????????display?all?information?available
-C,?--get-ctrl?<ctrl>[,<ctrl>...]
get?the?value?of?the?controls?[VIDIOC_G_EXT_CTRLS]
-c,?--set-ctrl?<ctrl>=<val>[,<ctrl>=<val>...]
set?the?value?of?the?controls?[VIDIOC_S_EXT_CTRLS]
-D,?--info????????show?driver?info?[VIDIOC_QUERYCAP]
-d,?--device?<dev>?use?device?<dev>?instead?of/dev/video0
if?<dev>?starts?with?a?digit,?then?/dev/video<dev>?is?used
-e,?--out-device?<dev>?use?device?<dev>?for?output?streams?instead?of?the?default?device?as?set?with?--device
if?<dev>?starts?with?a?digit,?then?/dev/video<dev>?is?used
-h,?--help?display?this?help?message
…………

也可以進(jìn)入以下網(wǎng)站：

https://www.mankier.com/1/v4l2-ctl

1）列出所有設(shè)備

命令：

v4l2-ctl?--list-devices

執(zhí)行結(jié)果：

rk3568_r:/?#?v4l2-ctl?--list-devices
v4l2-ctl?--list-devices
rkisp-statistics?(platform:?rkisp):
????????/dev/video7
????????/dev/video8

rkisp_mainpath?(platform:rkisp-vir0):
????????/dev/video0
????????/dev/video1
????????/dev/video2
????????/dev/video3
????????/dev/video4
????????/dev/video5
????????/dev/video6

2）指定設(shè)備的預(yù)覽支持格式

v4l2-ctl?--list-formats-ext?--device?/dev/video0
v4l2-ctl?--list-formats-ext?--device?/dev/video1

rk3568_r:/?#?v4l2-ctl?--list-formats-ext?--device?/dev/video0???
v4l2-ctl?--list-formats-ext?--device?/dev/video0????????????????
ioctl:?VIDIOC_ENUM_FMT??????????????????????????????????????????
????????Index???????:?0?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'UYVY'????????????????????????????????????
????????Name????????:?UYVY?4:2:2????????????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?1?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'422P'????????????????????????????????????
????????Name????????:?Planar?YUV?4:2:2??????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?2?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV16'????????????????????????????????????
????????Name????????:?Y/CbCr?4:2:2??????????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?3?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV61'????????????????????????????????????
????????Name????????:?Y/CrCb?4:2:2??????????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?4?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'YM16'????????????????????????????????????
????????Name????????:?Planar?YUV?4:2:2?(N-C)????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?5?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV21'????????????????????????????????????
????????Name????????:?Y/CrCb?4:2:0??????????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?6?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV12'????????????????????????????????????
????????Name????????:?Y/CbCr?4:2:0??????????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?7?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NM21'????????????????????????????????????
????????Name????????:?Y/CrCb?4:2:0?(N-C)????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?8?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NM12'????????????????????????????????????
????????Name????????:?Y/CbCr?4:2:0?(N-C)????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?9?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'YU12'????????????????????????????????????
????????Name????????:?Planar?YUV?4:2:0??????????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?10????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'YM24'????????????????????????????????????
????????Name????????:?Planar?YUV?4:4:4?(N-C)????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?11????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'RGGB'????????????????????????????????????
????????Name????????:?8-bit?Bayer?RGRG/GBGB?????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?12????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'GRBG'????????????????????????????????????
????????Name????????:?8-bit?Bayer?GRGR/BGBG?????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?13????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'GBRG'????????????????????????????????????
????????Name????????:?8-bit?Bayer?GBGB/RGRG?????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?14????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'BA81'????????????????????????????????????
????????Name????????:?8-bit?Bayer?BGBG/GRGR?????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?15????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'RG10'????????????????????????????????????
????????Name????????:?10-bit?Bayer?RGRG/GBGB????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?16????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'BA10'????????????????????????????????????
????????Name????????:?10-bit?Bayer?GRGR/BGBG????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?17????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'GB10'????????????????????????????????????
????????Name????????:?10-bit?Bayer?GBGB/RGRG????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?18????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'BG10'????????????????????????????????????
????????Name????????:?10-bit?Bayer?BGBG/GRGR????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?19????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'RG12'????????????????????????????????????
????????Name????????:?12-bit?Bayer?RGRG/GBGB????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?20????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'BA12'????????????????????????????????????
????????Name????????:?12-bit?Bayer?GRGR/BGBG????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?21????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'GB12'????????????????????????????????????
????????Name????????:?12-bit?Bayer?GBGB/RGRG????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?22????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'BG12'????????????????????????????????????
????????Name????????:?12-bit?Bayer?BGBG/GRGR????????????????????
????????????????Size:?Stepwise?32x16?-?2112x1568?with?step?8/8?????????????????????????????????????????????????
rk3568_r:/?#??????????????????????
rk3568_r:/?#?v4l2-ctl?--list-formats-ext?--device?/dev/video1???
v4l2-ctl?--list-formats-ext?--device?/dev/video1????????????????
ioctl:?VIDIOC_ENUM_FMT??????????????????????????????????????????
????????Index???????:?0?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'UYVY'????????????????????????????????????
????????Name????????:?UYVY?4:2:2????????????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?1?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'422P'????????????????????????????????????
????????Name????????:?Planar?YUV?4:2:2??????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?2?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV16'????????????????????????????????????
????????Name????????:?Y/CbCr?4:2:2??????????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?3?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV61'????????????????????????????????????
????????Name????????:?Y/CrCb?4:2:2??????????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?4?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'YM16'????????????????????????????????????
????????Name????????:?Planar?YUV?4:2:2?(N-C)????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?5?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV21'????????????????????????????????????
????????Name????????:?Y/CrCb?4:2:0??????????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?6?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NV12'????????????????????????????????????
????????Name????????:?Y/CbCr?4:2:0??????????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?7?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NM21'????????????????????????????????????
????????Name????????:?Y/CrCb?4:2:0?(N-C)????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?8?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'NM12'????????????????????????????????????
????????Name????????:?Y/CbCr?4:2:0?(N-C)????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?9?????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'YU12'????????????????????????????????????
????????Name????????:?Planar?YUV?4:2:0??????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?10????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'YM24'????????????????????????????????????
????????Name????????:?Planar?YUV?4:4:4?(N-C)????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?11????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'GREY'????????????????????????????????????
????????Name????????:?8-bit?Greyscale???????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?12????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'XR24'????????????????????????????????????
????????Name????????:?32-bit?BGRX?8-8-8-8???????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?13????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'RGBP'????????????????????????????????????
????????Name????????:?16-bit?RGB?5-6-5??????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??
????????????????????????????????????????????????????????????????
????????Index???????:?14????????????????????????????????????????
????????Type????????:?Video?Capture?Multiplanar?????????????????
????????Pixel?Format:?'FBCG'?(compressed)???????????????????????
????????Name????????:?Rockchip?fbc?gain?????????????????????????
????????????????Size:?Stepwise?32x16?-?1920x1080?with?step?8/8??

3）獲取指定設(shè)備的所有信息

v4l2-ctl?--all?--device?/dev/video0

設(shè)備信息如下：

rk3568_r:/?#?v4l2-ctl?--all?--device?/dev/video0
v4l2-ctl?--all?--device?/dev/video0
Driver?Info:
????????Driver?name??????:?rkisp_v5
????????Card?type????????:?rkisp_mainpath
????????Bus?info?????????:?platform:rkisp-vir0
????????Driver?version???:?1.8.0
????????Capabilities?????:?0x84201000
????????????????Video?Capture?Multiplanar
????????????????Streaming
????????????????Extended?Pix?Format
????????????????Device?Capabilities
????????Device?Caps??????:?0x04201000
????????????????Video?Capture?Multiplanar
????????????????Streaming
????????????????Extended?Pix?Format
Media?Driver?Info:
????????Driver?name??????:?rkisp-vir0
????????Model????????????:?rkisp0
????????Serial???????????:
????????Bus?info?????????:
????????Media?version????:?4.19.255
????????Hardware?revision:?0x00000000?(0)
????????Driver?version???:?4.19.255
Interface?Info:
????????ID???????????????:?0x0300000e
????????Type?????????????:?V4L?Video
Entity?Info:
????????ID???????????????:?0x0000000d?(13)
????????Name?????????????:?rkisp_mainpath
????????Function?????????:?V4L2?I/O
????????Pad?0x01000010???:?Sink
??????????Link?0x02000011:?from?remote?pad?0x1000004?of?entity?'rkisp-isp-subdev':?Data,?Enabled
Priority:?2
Format?Video?Capture?Multiplanar:
????????Width/Height??????:?2112/1568
????????Pixel?Format??????:?'NV12'
????????Field?????????????:?None
????????Number?of?planes??:?1
????????Flags?????????????:
????????Colorspace????????:?Default
????????Transfer?Function?:?Default
????????YCbCr?Encoding????:?Default
????????Quantization??????:?Full?Range
????????Plane?0???????????:
???????????Bytes?per?Line?:?2112
???????????Size?Image?????:?4967424
Crop:?Left?0,?Top?0,?Width?2112,?Height?1568
Selection:?crop,?Left?0,?Top?0,?Width?2112,?Height?1568,?Flags:
Selection:?crop_bounds,?Left?0,?Top?0,?Width?2112,?Height?1568,?Flags:
Selection:?crop,?Left?0,?Top?0,?Width?2112,?Height?1568,?Flags:
Selection:?crop_bounds,?Left?0,?Top?0,?Width?2112,?Height?1568,?Flags:

User?Controls

???????????????????????exposure?0x00980911?(int)????:?min=4?max=3324?step=1?default=1536?value=1536

Image?Source?Controls

??????????????vertical_blanking?0x009e0901?(int)????:?min=192?max=29631?step=1?default=192?value=192
????????????horizontal_blanking?0x009e0902?(int)????:?min=576?max=576?step=1?default=576?value=576?flags=read-only
??????????????????analogue_gain?0x009e0903?(int)????:?min=16?max=248?step=1?default=16?value=16

Image?Processing?Controls

?????????????????link_frequency?0x009f0901?(intmenu):?min=0?max=0?default=0?value=0?flags=read-only
?????????????????????pixel_rate?0x009f0902?(int64)??:?min=0?max=0?step=0?default=0?value=120000000?flags=read-only
???????????????????test_pattern?0x009f0903?(menu)???:?min=0?max=4?default=0?value=0

4） 顯示攝像頭參數(shù)

v4l2-ctl?--list-ctrls?--device?/dev/video0
或者
v4l2-ctl?-d?/dev/video0?-l?

顯示攝像頭參數(shù)

rk3568_r:/?#?v4l2-ctl?-d?/dev/video0?-l?????
v4l2-ctl?-d?/dev/video0?-l??
User?Controls???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
???????????????????????exposure?0x00980911?(int)????:?min=4?max=3324?step=1?default=1536?value=1536???
Image?Source?Controls??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
??????????????vertical_blanking?0x009e0901?(int)????:?min=192?max=29631?step=1?default=192?value=192???
????????????horizontal_blanking?0x009e0902?(int)????:?min=576?max=576?step=1?default=576?value=576?flags=read-only?
??????????????????analogue_gain?0x009e0903?(int)????:?min=16?max=248?step=1?default=16?value=16???
Image?Processing?Controls???????????????????????????????????????????????????????????????????????????????????????????????????????
?????????????????link_frequency?0x009f0901?(intmenu):?min=0?max=0?default=0?value=0?flags=read-only?
?????????????????????pixel_rate?0x009f0902?(int64)??:?min=0?max=120000000?step=1?default=120000000?value=120000000?flags=read-only??????
???????????????????test_pattern?0x009f0903?(menu)???:?min=0?max=4?default=0?value=0???

5）增加曝光exposure

exposure值區(qū)間為: ?4-3324
命令實(shí)例：

v4l2-ctl?-d?/dev/video0?--set-ctrl?exposure=3324

6）增加圖片亮度analogue_gain

analogue_gain用于設(shè)置顯示的圖像的亮度

analogue_gain值區(qū)間：

16-248

命令實(shí)例：

v4l2-ctl?-d?/dev/video0?--set-ctrl?analogue_gain=240

analogue_gain=16現(xiàn)象

analogue_gain=244現(xiàn)象【效果非常明顯】

7）使用v4l2-ctl抓幀

v4l2-ctl?-d?/dev/video0?--set-fmt-video=width=800,height=600,pixelformat=NV12?--stream-mmap=3?--stream-to=/sdcard/out.yuv?--stream-skip=9?--stream-count=1
m-mmap=3?--stream-to=/sdcard/out.yuv?--stream-skip=9?--stream-count=1?????????<
<<<<<<<<<?7.51?fps
<

【看到<<<<<<<<< 7.51 fps 說明成功】

參數(shù)說明

-d：?攝像頭對(duì)應(yīng)設(shè)備文件
--set-fmt-video：指定了寬高及pxielformat(用FourCC表示)。NV12即用FourCC表示的pixelformat
--stream-mmap：指定buffer的類型為mmap，即由kernel分配的物理連續(xù)的或經(jīng)過iommu映射的buffer
--stream-to：指定幀數(shù)據(jù)保存的文件路徑
--stream-skip：指定丟棄(不保存到文件)前3幀
--stream-count：指定抓取的幀數(shù)，不包括--stream-skip丟棄的數(shù)量

其他參數(shù)
--set-selection，指定對(duì)輸入圖像進(jìn)行裁剪。特別是當(dāng)RKISP1的前級(jí)大小發(fā)生變化時(shí)要保證selection不大于前級(jí)輸出大小。RKCIF的裁剪則是通過--set-crop參數(shù)設(shè)置的
--stream-poll，該選項(xiàng)指示v4l2-ctl采用異步IO，即在dqbuf前先用select等等幀數(shù)據(jù)完成，從而保證dqbuf不阻塞。否則dqbuf將會(huì)阻塞直到有數(shù)據(jù)幀到來

如果支持264的可以編碼為h264查看

v4l2-ctl?--device?/dev/video0?--set-fmt-video=width=1920,height=1080,pixelformat=H264?--stream-mmap=3?--stream-to=/sdcard/output?--stream-count=100

v4l2-ctl?--device?/dev/video0?--set-fmt-video=width=1920,height=1080,pixelformat=MJPG?--stream-mmap?--stream-to=/sdcard/output.mjpg?--stream-count=300

8）測(cè)試顯示信息test_pattern

參數(shù)test_pattern，可以用于測(cè)試顯示圖像

• 0：攝像頭1-3 測(cè)試圖片

命令實(shí)例：

v4l2-ctl?-d?/dev/video0?--set-ctrl?test_pattern=0?

test_pattern = 1test_pattern = 2test_pattern = 3

4. 顯示圖片

上一節(jié)，抓取的圖片、視頻要可以拷貝到ubuntu中借助借助工具ffplay查看。

1）ffplay

FFmpeg是一套可以用來記錄、轉(zhuǎn)換數(shù)字音頻、視頻，并能將其轉(zhuǎn)化為流的開源計(jì)算機(jī)程序。

采用LGPL或GPL許可證。它提供了錄制、轉(zhuǎn)換以及流化音視頻的完整解決方案。

它包含了非常先進(jìn)的音頻/視頻編解碼庫(kù)libavcodec，為了保證高可移植性和編解碼質(zhì)量，libavcodec里很多code都是從頭開發(fā)的。

ffplay是FFmpeg提供的一個(gè)極為簡(jiǎn)單的音視頻媒體播放器（由ffmpeg庫(kù)和SDL庫(kù)開發(fā)），可以用于音視頻播放、可視化分析 ，提供音視頻顯示和播放相關(guān)的圖像信息、音頻的波形等信息，也可以用作FFmpeg API的測(cè)試工具使用。

由于是基于FFmpeg開發(fā)所以ffmpeg支持的視音頻格式它基本上都支持，不過ffplay不是圖形化界面需要通過CMD命令窗口來操作。

2）官網(wǎng)網(wǎng)站

http://www.ffmpeg.org/ffplay.html

3）ffplay命令選項(xiàng)：

基本格式：?ffplay?[選項(xiàng)]?[‘輸入文件’]

主要選項(xiàng)：

-x?width??????強(qiáng)制顯示寬帶
-y?height??????強(qiáng)制顯示高度
-video_size?size????設(shè)置幀尺寸?設(shè)置幀尺寸大小。
?適用于類似原始YUV等沒有包含幀大小(WxH)的視頻。
?例如：ffplay?-pixel_format?yuv420p?-video_size?320x240?-framerate?5?yuv420p_320x240.yuv
-pixel_format?format???設(shè)置像素格式。
-volume?vol?????設(shè)置起始音量。音量范圍[0?~100]
-window_title?title???設(shè)置窗口標(biāo)題（默認(rèn)為輸入文件名）
-loop?number?????設(shè)置播放循環(huán)次數(shù)
-showmode?mode?????設(shè)置顯示模式，可用的模式值：0?顯示視頻，1?顯示音頻波形，2?顯示音頻頻譜。缺省為0，如果視頻不存在則自動(dòng)選擇2
-vf?filtergraph????設(shè)置視頻濾鏡
-af?filtergraph????設(shè)置音頻濾鏡
-f?fmt???????強(qiáng)制使用設(shè)置的格式進(jìn)行解析。比如-f?s16le?

-fs??????以全屏模式啟動(dòng)
-an??????禁用音頻（不播放聲音）
-vn??????禁用視頻（不播放視頻）
-sn??????禁用字幕（不顯示字幕）
-nodisp?????關(guān)閉圖形化顯示窗口，視頻將不顯示
-noborder?????無邊框窗口


-t?duration???設(shè)置播放視頻/音頻長(zhǎng)度，時(shí)間單位如?-ss選項(xiàng)
-ss?pos????跳轉(zhuǎn)到指定的位置，注意時(shí)間單位：
??比如：'55'?55?seconds,?
???'12:03:45'?,12?hours,?03?minutes?and?45?seconds,?
???'23.189'?23.189?second


-bytes????????按字節(jié)進(jìn)行跳轉(zhuǎn)（0=off?1=on?-1=auto）。
-seek_interval?interval???自定義左/右鍵定位拖動(dòng)間隔（以秒為單位），默認(rèn)值為10秒（代碼沒有看到實(shí)現(xiàn)）

4）顯示圖片

將文件**/sdcard/out.yuv從板子通過adb pull**命令拷貝出來，
運(yùn)行于windows下：

adb?pull?/sdcard/out.yuv

再拷貝到ubuntu中，執(zhí)行以下命令顯示圖片【用其他可以打開yuv格式圖片的工具也可以】

ffplay?out.yuv?-f?rawvideo?-pixel_format?nv12?-video_size?800x600

掌握了這些命令，我們就可以調(diào)試攝像頭了。

后面還會(huì)繼續(xù)更新幾篇Camera文章，

建議大家訂閱本專題！