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标题: V4L2如何设置帧率？ [打印本页]

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作者: luffy    时间: 2019-12-6 16:44
标题: V4L2如何设置帧率？


RK3399平台
Sensor 支持120FPS, 我设置的60FPS， 但是我v4l2读取速率一直都是30FPS, 测MIPI信号也是差不多60FPS
读取代码如下：

1. 
   
2. int Camera::readFrame()
   
3. {
   
4.   struct v4l2_buffer buf;
   
5.   int i, bytesused;
   
6. 
   
7.   CLEAR(buf);
   
8. 
   
9.   buf.type = m_bufType;
   
10.   buf.memory = V4L2_MEMORY_MMAP;
    
11. 
    
12.   if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == m_bufType) {
    
13.     struct v4l2_plane planes[FMT_NUM_PLANES];
    
14.     buf.m.planes = planes;
    
15.     buf.length = FMT_NUM_PLANES;
    
16.   }
    
17. 
    
18.   if (-1 == xioctl(m_camfd, VIDIOC_DQBUF, &buf)) {
    
19.     ERR("VIDIOC_DQBUF");
    
20.     return -1;
    
21.   }
    
22. 
    
23.   i = buf.index;
    
24. 
    
25.   if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == m_bufType)
    
26.     bytesused = buf.m.planes[0].bytesused;
    
27.   else
    
28.     bytesused = buf.bytesused;
    
29. 
    
30.   uint8_t *pdata = (uint8_t *)(m_imgBuffers[i].start);
    
31.   for (size_t i = 0; i < m_width*m_height*2; i+=2) {
    
32.     m_rawBuffer[i] = pdata[i+1];
    
33.     m_rawBuffer[i+1] = pdata[i];
    
34.   }
    
35. 
    
36.   if (-1 == xioctl(m_camfd, VIDIOC_QBUF, &buf)) {
    
37.     ERR("VIDIOC_QBUF");
    
38.     return -1;
    
39.   }
    
40. 
    
41.   return 0;
    
42. }
    
43. 
    
44. bool Camera::trigger()
    
45. {
    
46.   struct reg_map regs[] = {
    
47.     {0x1100, 0x01},
    
48.     {REG_NULL, 0x00},
    
49.   };
    
50.   return ioctl(m_camconf_fd, SET_REGS_ONLINE_CMD, regs) == 0 ? true : false;
    
51. }
    
52. 
    
53. int Camera::nextFrame(std::vector<CameraFrame> &frames)
    
54. {
    
55.   if (m_triggerMode) {
    
56.     if (!trigger()) {
    
57.       LOG(ERROR) << "trigger error";
    
58.       return -1;
    
59.     }
    
60.   }
    
61. 
    
62.   std::lock_guard<std::mutex> l(m_runLock);
    
63.   if (!m_isRunning) {
    
64.     LOG(ERROR) << "not running, can not read frame";
    
65.     return -1;
    
66.   }
    
67. 
    
68.   TimeMeasure tm;
    
69.   tm.addRecord("all");
    
70.   tm.addRecord("read");
    
71.   if (readFrame() == -1) {
    
72.     return -1;
    
73.   }
    
74.   LOG(INFO) << "read frame cost: " << tm.stopRecord("read") << "ms";
    
75. 
    
76.   CameraFrame frame;
    
77.   frame.pdata = m_rawBuffer;
    
78.   frame.step = m_width * 2;
    
79.   frame.type = kTypeGray;
    
80.   frame.width = m_width;
    
81.   frame.height = m_height;
    
82.   frame.fmt = kFmt16Gray;
    
83.   frames.push_back(frame);
    
84. 
    
85.   return 0;
    
86. }

复制代码

驱动配置如下:

1.         {
   
2.                 .width = 640,
   
3.                 .height = 480,
   
4.                 .max_fps = {
   
5.                         .numerator = 1,
   
6.                         .denominator = 120,
   
7.                 },
   
8.                 .hts_def = 640,
   
9.                 .vts_def = 480,
   
10.                 .regs_size = ARRAY_SIZE(cam_640x480_regs),
    
11.                 .reg_list = cam_640x480_regs,
    
12.         },

复制代码

1. static int cam_g_frame_interval(struct v4l2_subdev *sd,
   
2.                                     struct v4l2_subdev_frame_interval *fi)
   
3. {
   
4.         struct mycam *mycam = to_mycam(sd);
   
5.         const struct mycam_mode *mode = mycam->cur_mode;
   
6. 
   
7.         mutex_lock(&mycam->mutex);
   
8.         fi->interval = mode->max_fps;
   
9.         mutex_unlock(&mycam->mutex);
   
10. 
    
11.         return 0;
    
12. }

复制代码

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作者: yy834277137    时间: 2022-6-17 10:55
请问解决了吗

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作者: via    时间: 2022-12-2 23:36
这代码是在哪里？ 可以提供下代码文件？

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