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Allow YUYV capture via libv4l

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This commit is contained in:
soyer 2015-01-15 15:10:15 +01:00
parent b2a5e66fc5
commit d84d3a519b
3 changed files with 21 additions and 12 deletions
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3
modules/videoio/include/opencv2/videoio.hpp
View File

@ -136,7 +136,8 @@ enum { CAP_PROP_POS_MSEC =0,
// Currently, these are supported through the libv4l interface only.
enum { CAP_MODE_BGR = 0, // BGR24 (default)
CAP_MODE_RGB = 1, // RGB24
CAP_MODE_GRAY = 2 // Y8
CAP_MODE_GRAY = 2, // Y8
CAP_MODE_YUYV = 3 // YUYV
};

3
modules/videoio/include/opencv2/videoio/videoio_c.h
View File

@ -299,7 +299,8 @@ enum
{
CV_CAP_MODE_BGR = 0, // BGR24 (default)
CV_CAP_MODE_RGB = 1, // RGB24
CV_CAP_MODE_GRAY = 2 // Y8
CV_CAP_MODE_GRAY = 2, // Y8
CV_CAP_MODE_YUYV = 3 // YUYV
};
enum

27
modules/videoio/src/cap_libv4l.cpp
View File

@ -646,6 +646,8 @@ static inline int channels_for_mode(int mode)
switch(mode) {
case CV_CAP_MODE_GRAY:
return 1;
case CV_CAP_MODE_YUYV:
return 2;
default:
return 3;
}
@ -713,31 +715,26 @@ static int _capture_V4L2 (CvCaptureCAM_V4L *capture, char *deviceName)
/* libv4l will convert from any format to V4L2_PIX_FMT_BGR24,
V4L2_PIX_FMT_RGV24, or V4L2_PIX_FMT_YUV420 */
unsigned int requestedPixelFormat;
int width;
int height;
switch (capture->mode) {
case CV_CAP_MODE_RGB:
requestedPixelFormat = V4L2_PIX_FMT_RGB24;
width = capture->width;
height = capture->height;
break;
case CV_CAP_MODE_GRAY:
requestedPixelFormat = V4L2_PIX_FMT_YUV420;
width = capture->width;
height = capture->height;
break;
case CV_CAP_MODE_YUYV:
requestedPixelFormat = V4L2_PIX_FMT_YUYV;
break;
default:
requestedPixelFormat = V4L2_PIX_FMT_BGR24;
width = capture->width;
height = capture->height;
break;
}
CLEAR (capture->form);
capture->form.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
capture->form.fmt.pix.pixelformat = requestedPixelFormat;
capture->form.fmt.pix.field = V4L2_FIELD_ANY;
capture->form.fmt.pix.width = width;
capture->form.fmt.pix.height = height;
capture->form.fmt.pix.width = capture->width;
capture->form.fmt.pix.height = capture->height;
if (-1 == xioctl (capture->deviceHandle, VIDIOC_S_FMT, &capture->form)) {
fprintf(stderr, "VIDEOIO ERROR: libv4l unable to ioctl S_FMT\n");
@ -949,6 +946,10 @@ static int _capture_V4L (CvCaptureCAM_V4L *capture, char *deviceName)
requestedVideoPalette = VIDEO_PALETTE_YUV420;
depth = 8;
break;
case CV_CAP_MODE_YUYV:
requestedVideoPalette = VIDEO_PALETTE_YUYV;
depth = 16;
break;
default:
requestedVideoPalette = VIDEO_PALETTE_RGB24;
depth = 24;
@ -1319,6 +1320,7 @@ static IplImage* icvRetrieveFrameCAM_V4L( CvCaptureCAM_V4L* capture, int) {
switch(capture->imageProperties.palette) {
case VIDEO_PALETTE_RGB24:
case VIDEO_PALETTE_YUV420:
case VIDEO_PALETTE_YUYV:
memcpy((char *)capture->frame.imageData,
(char *)(capture->memoryMap + capture->memoryBuffer.offsets[capture->bufferIndex]),
capture->frame.imageSize);
@ -1464,6 +1466,10 @@ static int icvSetVideoSize( CvCaptureCAM_V4L* capture, int w, int h) {
cropHeight = h*8;
cropWidth = w*8;
break;
case CV_CAP_MODE_YUYV:
cropHeight = h*16;
cropWidth = w*16;
break;
default:
cropHeight = h*24;
cropWidth = w*24;
@ -1719,6 +1725,7 @@ static int icvSetPropertyCAM_V4L(CvCaptureCAM_V4L* capture, int property_id, dou
case CV_CAP_MODE_BGR:
case CV_CAP_MODE_RGB:
case CV_CAP_MODE_GRAY:
case CV_CAP_MODE_YUYV:
capture->mode = mode;
/* recreate the capture buffer for the same output resolution
but a different pixel format */