Tool/software: Linux
Dear TI Experts,
My hardware board is AM5718 IDK, and it is run at RT Linux SDK for the latest version.
I have implemented a simple camera application with is similar to dual-camera example.
During my test the camera passed the commends:
VIDIOC_QUERYCAP
VIDIOC_ENUM_FMT
VIDIOC_G_FMT
VIDIOC_S_FMT
And it also applied the buffer:
VIDIOC_REQBUFS
But it will failed during VIDIOC_QBUF command, it throws a Invalid argument error. The part of example code is as bellow:
int Init_Cameral(int Width , int Hight)
{
printf("Nemo Init Cameral\n");
//open device
fd = open(FILE_VIDEO, O_RDWR);
if(-1 == fd )
{
perror("open video device fail");
printf("Nemo open video device fail\n");
return -1 ;
}
// Check if the device is capable of streaming
if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 )
{
perror("Nemo VIDIOC_QUERYCAP");
return -1;
}
else
{
printf("Nemo VIDIOC_QUERYCAP ok\n");
printf("driver:\t\t%s\n",cap.driver);
printf("card:\t\t%s\n",cap.card);
printf("bus_info:\t%s\n",cap.bus_info);
printf("version:\t%d\n",cap.version);
printf("capabilities:\t%x\n",cap.capabilities);
if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == V4L2_CAP_VIDEO_CAPTURE)
{
printf("Nemo Device %s: supports capture.\n",FILE_VIDEO);
}
if ((cap.capabilities & V4L2_CAP_STREAMING) == V4L2_CAP_STREAMING)
{
printf("Nemo Device %s: supports streaming.\n",FILE_VIDEO);
}
}
//emu all support fmt
fmtdesc.index=0;
fmtdesc.type=V4L2_BUF_TYPE_VIDEO_CAPTURE;
printf("Support format:\n");
while(ioctl(fd,VIDIOC_ENUM_FMT,&fmtdesc)!=-1)
{
printf("Nemo \t%d.%s\n",fmtdesc.index+1,fmtdesc.description);
fmtdesc.index++;
}
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(ioctl(fd, VIDIOC_G_FMT, &fmt) == -1)
{
printf("Unable to get format\n");
return -1;
}
else
{
printf("Nemo enable to get format\n");
}
fmt.fmt.pix.pixelformat = FOURCC_STR("YUYV");
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.height = IMAGEHEIGHT;
fmt.fmt.pix.width = IMAGEWIDTH;
//fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if(ioctl(fd, VIDIOC_S_FMT, &fmt) == -1)
{
printf("Unable to set format\n");
return -1;
}
{
printf("fmt.type:\t\t%d\n",fmt.type);
printf("pix.pixelformat:\t%c%c%c%c\n",fmt.fmt.pix.pixelformat & 0xFF, (fmt.fmt.pix.pixelformat >> 8) & 0xFF,(fmt.fmt.pix.pixelformat >> 16) & 0xFF, (fmt.fmt.pix.pixelformat >> 24) & 0xFF);
printf("pix.height:\t\t%d\n",fmt.fmt.pix.height);
printf("pix.width:\t\t%d\n",fmt.fmt.pix.width);
printf("pix.field:\t\t%d\n",fmt.fmt.pix.field);
}
//set fps
setfps.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
setfps.parm.capture.timeperframe.numerator = 10;
setfps.parm.capture.timeperframe.denominator = 10;
printf("init %s \t[OK]\n",FILE_VIDEO);
int i ;
int ret ;
//apply buffers
//3
struct v4l2_requestbuffers requestbuffer ;
requestbuffer.count = COUNT ;
requestbuffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE ;
requestbuffer.memory = V4L2_MEMORY_DMABUF ;
ret = ioctl(fd , VIDIOC_REQBUFS , &requestbuffer);
if(ret != 0)
{
perror("request buffer fail ");
return -3 ;
}
else
{
printf("Nemo VIDIOC_REQBUFS ok\n ");
}
//querybuffer
struct v4l2_buffer querybuffer ;
querybuffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE ;
querybuffer.memory = V4L2_MEMORY_DMABUF ;
struct v4l2_buffer queuebuffer;
queuebuffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE ;
queuebuffer.memory = V4L2_MEMORY_DMABUF ;
for(i = 0 ; i < COUNT ; i++)
{
querybuffer.index = i ;
ret = ioctl(fd , VIDIOC_QUERYBUF , &querybuffer);
if(ret != 0)
{
perror("query buffer fail");
return -4 ;
}
else
{
printf("nemo VIDIOC_QUERYBUF ok\n");
}
printf("index:%d length:%d offset:%d \n" ,
querybuffer.index , querybuffer.length , querybuffer.m.offset);
length = querybuffer.length ;
//memory mapping
yuv[i] = mmap(0,querybuffer.length , PROT_READ | PROT_WRITE , MAP_SHARED , fd , querybuffer.m.offset );
//queue
queuebuffer.index = i ;
ret = ioctl(fd , VIDIOC_QBUF , &queuebuffer);
if(ret != 0)
{
perror("queuebuffer fail");
return -5 ;
}
}
//init queue
enqueue.type = V4L2_BUF_TYPE_VIDEO_CAPTURE ;
dequeue.type = V4L2_BUF_TYPE_VIDEO_CAPTURE ;
enqueue.memory = V4L2_MEMORY_DMABUF ;
dequeue.memory = V4L2_MEMORY_DMABUF ;
return 0 ;
}
And the log is as bellow:
root@am57xx-evm:~# ./camera Nemo Init Cameral Nemo VIDIOC_QUERYCAP ok driver: vip card: vip bus_info: platform:vip version: 263200 capabilities: 85200001 Nemo Device /dev/video1: supports capture. Nemo Device /dev/video1: supports streaming. Support format: Nemo 1.Y/CbCr 4:2:0 Nemo 2.UYVY 4:2:2 Nemo 3.YUYV 4:2:2 Nemo 4.VYUY 4:2:2 Nemo 5.YVYU 4:2:2 Nemo 6.24-bit RGB 8-8-8 Nemo 7.32-bit A/XRGB 8-8-8-8 Nemo 8.24-bit BGR 8-8-8 Nemo 9.32-bit BGRA/X 8-8-8-8 Nemo 10.8-bit Bayer BGBG/GRGR Nemo enable to get format fmt.type: 1 pix.pixelformat: YUYV pix.height: 240 pix.width: 320 pix.field: 1 init /dev/video1 [OK] Nemo VIDIOC_REQBUFS ok nemo VIDIOC_QUERYBUF ok index:0 length:153600 offset:0 queuebuffer fail: Invalid argument root@am57xx-evm:~# ./camera Nemo Init Cameral Nemo VIDIOC_QUERYCAP ok driver: vip card: vip bus_info: platform:vip version: 263200 capabilities: 85200001 Nemo Device /dev/video1: supports capture. Nemo Device /dev/video1: supports streaming. Support format: Nemo 1.Y/CbCr 4:2:0 Nemo 2.UYVY 4:2:2 Nemo 3.YUYV 4:2:2 Nemo 4.VYUY 4:2:2 Nemo 5.YVYU 4:2:2 Nemo 6.24-bit RGB 8-8-8 Nemo 7.32-bit A/XRGB 8-8-8-8 Nemo 8.24-bit BGR 8-8-8 Nemo 9.32-bit BGRA/X 8-8-8-8 Nemo 10.8-bit Bayer BGBG/GRGR Nemo enable to get format fmt.type: 1 pix.pixelformat: YUYV pix.height: 240 pix.width: 320 pix.field: 1 init /dev/video1 [OK] Nemo VIDIOC_REQBUFS ok nemo VIDIOC_QUERYBUF ok index:0 length:153600 offset:0 queuebuffer fail: Invalid argument
What is the problem in here? Thanks a lot!
Best Regards,
Nemo
