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libcamera: v4l2_videodevice: Support filtering formats by media bus code

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Add support for the recent V4L2 extension to VIDIOC_ENUM_FMT that allows
filtering pixel formats by media bus codes.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart 2020-03-13 03:38:00 +02:00
parent 972bb30c4b
commit cd6addc31b
2 changed files with 15 additions and 5 deletions
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4
src/libcamera/include/v4l2_videodevice.h
View file

@ -187,7 +187,7 @@ public:
int getFormat(V4L2DeviceFormat *format);
int setFormat(V4L2DeviceFormat *format);
std::map<V4L2PixelFormat, std::vector<SizeRange>> formats();
std::map<V4L2PixelFormat, std::vector<SizeRange>> formats(uint32_t code = 0);
int setSelection(unsigned int target, Rectangle *rect);
@ -225,7 +225,7 @@ private:
int getFormatSingleplane(V4L2DeviceFormat *format);
int setFormatSingleplane(V4L2DeviceFormat *format);
std::vector<V4L2PixelFormat> enumPixelformats();
std::vector<V4L2PixelFormat> enumPixelformats(uint32_t code);
std::vector<SizeRange> enumSizes(V4L2PixelFormat pixelFormat);
int requestBuffers(unsigned int count, enum v4l2_memory memoryType);

16
src/libcamera/v4l2_videodevice.cpp
View file

@ -917,16 +917,19 @@ int V4L2VideoDevice::setFormatSingleplane(V4L2DeviceFormat *format)
/**
* \brief Enumerate all pixel formats and frame sizes
* \param[in] code Restrict formats to this media bus code.
*
* Enumerate all pixel formats and frame sizes supported by the video device.
* If the \a code argument is not zero, only formats compatible with that media
* bus code will be enumerated.
*
* \return A list of the supported video device formats
*/
std::map<V4L2PixelFormat, std::vector<SizeRange>> V4L2VideoDevice::formats()
std::map<V4L2PixelFormat, std::vector<SizeRange>> V4L2VideoDevice::formats(uint32_t code)
{
std::map<V4L2PixelFormat, std::vector<SizeRange>> formats;
for (V4L2PixelFormat pixelFormat : enumPixelformats()) {
for (V4L2PixelFormat pixelFormat : enumPixelformats(code)) {
std::vector<SizeRange> sizes = enumSizes(pixelFormat);
if (sizes.empty())
return {};
@ -944,15 +947,22 @@ std::map<V4L2PixelFormat, std::vector<SizeRange>> V4L2VideoDevice::formats()
return formats;
}
std::vector<V4L2PixelFormat> V4L2VideoDevice::enumPixelformats()
std::vector<V4L2PixelFormat> V4L2VideoDevice::enumPixelformats(uint32_t code)
{
std::vector<V4L2PixelFormat> formats;
int ret;
if (code && !(caps_.device_caps() & V4L2_CAP_IO_MC)) {
LOG(V4L2, Error)
<< "Media bus code filtering not supported by the device";
return {};
}
for (unsigned int index = 0; ; index++) {
struct v4l2_fmtdesc pixelformatEnum = {};
pixelformatEnum.index = index;
pixelformatEnum.type = bufferType_;
pixelformatEnum.mbus_code = code;
ret = ioctl(VIDIOC_ENUM_FMT, &pixelformatEnum);
if (ret)