Linux
涓?/p>
V4L2
缂栫▼灏忕粨
涓�锛庤缃噰闆嗘柟寮忥紝鏍煎紡
甯哥敤鍛戒护鏍囧織
鎵撳紑瑙嗛璁惧鍚庯紝鍙互璁剧疆璇ヨ棰戣澶囩殑灞炴�э紝渚嬪瑁佸壀銆佺缉鏀剧瓑銆傝繖涓�姝ユ槸鍙�夌殑銆?/p>
鍦?/p>
Linux
缂栫▼涓紝涓�鑸娇鐢?/p>
ioctl
鍑芥暟鏉ュ璁惧鐨?/p>
I/O
閫氶亾杩涜绠＄悊锛?/p>
extern int ioctl (int __fd, unsigned long int __request, 鈥? __THROW;
__fd
锛氳澶囩殑
ID
锛屼緥濡傚垰鎵嶇敤
open
鍑芥暟鎵撳紑瑙嗛閫氶亾鍚庤繑鍥炵殑
cameraFd
锛?/p>
__request
锛氬叿浣撶殑鍛戒护鏍囧織绗︺�?/p>
鍦ㄨ繘琛?/p>
V4L2
寮�鍙戜腑锛屼竴鑸細鐢ㄥ埌浠ヤ笅鐨勫懡浠ゆ爣蹇楃锛?/p>
1.
VIDIOC_REQBUFS
锛氬垎閰嶅唴瀛?/p>
2.
VIDIOC_QUERYBUF
锛氭妸
VIDIOC_REQBUFS
涓垎閰嶇殑鏁版嵁缂撳瓨杞崲鎴愮墿鐞嗗湴鍧�
3.
VIDIOC_QUERYCAP
锛氭煡璇㈤┍鍔ㄥ姛鑳?/p>
4.
VIDIOC_ENUM_FMT
锛氳幏鍙栧綋鍓嶉┍鍔ㄦ敮鎸佺殑瑙嗛鏍煎紡
5.
VIDIOC_S_FMT
锛氳缃綋鍓嶉┍鍔ㄧ殑棰戞崟鑾锋牸寮?/p>
6.
VIDIOC_G_FMT
锛氳鍙栧綋鍓嶉┍鍔ㄧ殑棰戞崟鑾锋牸寮?/p>
7.
VIDIOC_TRY_FMT
锛氶獙璇佸綋鍓嶉┍鍔ㄧ殑鏄剧ず鏍煎紡
8.
VIDIOC_CROPCAP
锛氭煡璇㈤┍鍔ㄧ殑淇壀鑳藉姏
9.
VIDIOC_S_CROP
锛氳缃棰戜俊鍙风殑杈规
10.
V
IDIOC_G_CROP
锛氳鍙栬棰戜俊鍙风殑杈规
11.
V
IDIOC_QBUF
锛氭妸鏁版嵁浠庣紦瀛樹腑璇诲彇鍑烘潵
12.
V
IDIOC_DQBUF
锛氭妸鏁版嵁鏀惧洖缂撳瓨闃熷垪
13.
V
IDIOC_STREAMON
锛氬紑濮嬭棰戞樉绀哄嚱鏁?/p>
14.
V
IDIOC_STREAMOFF
锛氱粨鏉熻棰戞樉绀哄嚱鏁?/p>
15.
V
IDIOC_QUERYSTD
锛氭鏌ュ綋鍓嶈棰戣澶囨敮鎸佺殑鏍囧噯锛屼緥濡?/p>
PAL
鎴?/p>
NTSC
銆?/p>
杩欎簺
IO
璋冪敤锛屾湁浜涙槸蹇呴』鐨勶紝鏈変簺鏄彲閫夋嫨鐨勩�?/p>
浜?/p>
.
涓�鑸搷浣滄祦绋嬶紙瑙嗛璁惧锛?/p>
1.
鎵撳紑璁惧鏂囦欢銆?/p>
int fd=open(鈥?dev/video0鈥?O_RDWR);
2.
鍙栧緱璁惧鐨?/p>
capability
锛?/p>
鐪嬬湅璁惧鍏锋湁浠�涔堝姛鑳斤紝
姣斿鏄惁鍏锋湁瑙嗛杈撳叆
,
鎴栬�呴煶棰戣緭鍏?/p>
杈撳嚭绛夈�?/p>
VIDIOC_QUERYCAP,struct v4l2_capability
v4l2_std_id std;
do {