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libcamera: v4l2_device: Add enumeration of pixelformats and frame sizes

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Add methods to enumerate pixelformats and frame sizes from a V4L2
device. The interface is similar to how V4L2Subdevice enumerates mbus
codes and frame sizes.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Niklas Söderlund 2019-05-01 01:36:36 +02:00
parent ce02ea29cd
commit 87e46f7f59
2 changed files with 119 additions and 0 deletions
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114
src/libcamera/v4l2_device.cpp
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@ -634,6 +634,33 @@ int V4L2Device::setFormatSingleplane(V4L2DeviceFormat *format)
return 0;
}
/**
* \brief Enumerate all pixel formats and frame sizes
*
* Enumerate all pixel formats and frame sizes supported by the video device.
*
* \return A list of the supported device formats
*/
ImageFormats V4L2Device::formats()
{
ImageFormats formats;
for (unsigned int pixelformat : enumPixelformats()) {
std::vector<SizeRange> sizes = enumSizes(pixelformat);
if (sizes.empty())
return {};
if (formats.addFormat(pixelformat, sizes)) {
LOG(V4L2, Error)
<< "Could not add sizes for pixel format "
<< pixelformat;
return {};
}
}
return formats;
}
int V4L2Device::requestBuffers(unsigned int count)
{
struct v4l2_requestbuffers rb = {};
@ -763,6 +790,93 @@ int V4L2Device::createPlane(Buffer *buffer, unsigned int planeIndex,
return 0;
}
std::vector<unsigned int> V4L2Device::enumPixelformats()
{
std::vector<unsigned int> formats;
int ret;
for (unsigned int index = 0; ; index++) {
struct v4l2_fmtdesc pixelformatEnum = {};
pixelformatEnum.index = index;
pixelformatEnum.type = bufferType_;
ret = ioctl(fd_, VIDIOC_ENUM_FMT, &pixelformatEnum);
if (ret)
break;
formats.push_back(pixelformatEnum.pixelformat);
}
if (ret && errno != EINVAL) {
ret = -errno;
LOG(V4L2, Error)
<< "Unable to enumerate pixel formats: "
<< strerror(-ret);
return {};
}
return formats;
}
std::vector<SizeRange> V4L2Device::enumSizes(unsigned int pixelFormat)
{
std::vector<SizeRange> sizes;
int ret;
for (unsigned int index = 0;; index++) {
struct v4l2_frmsizeenum frameSize = {};
frameSize.index = index;
frameSize.pixel_format = pixelFormat;
ret = ioctl(fd_, VIDIOC_ENUM_FRAMESIZES, &frameSize);
if (ret)
break;
if (index != 0 &&
frameSize.type != V4L2_FRMSIZE_TYPE_DISCRETE) {
LOG(V4L2, Error)
<< "Non-zero index for non discrete type";
return {};
}
switch (frameSize.type) {
case V4L2_FRMSIZE_TYPE_DISCRETE:
sizes.emplace_back(frameSize.discrete.width,
frameSize.discrete.height);
break;
case V4L2_FRMSIZE_TYPE_CONTINUOUS:
sizes.emplace_back(frameSize.stepwise.min_width,
frameSize.stepwise.min_height,
frameSize.stepwise.max_width,
frameSize.stepwise.max_height);
break;
case V4L2_FRMSIZE_TYPE_STEPWISE:
sizes.emplace_back(frameSize.stepwise.min_width,
frameSize.stepwise.min_height,
frameSize.stepwise.max_width,
frameSize.stepwise.max_height,
frameSize.stepwise.step_width,
frameSize.stepwise.step_height);
break;
default:
LOG(V4L2, Error)
<< "Unknown VIDIOC_ENUM_FRAMESIZES type "
<< frameSize.type;
return {};
}
}
if (ret && errno != EINVAL) {
ret = -errno;
LOG(V4L2, Error)
<< "Unable to enumerate frame sizes: "
<< strerror(-ret);
return {};
}
return sizes;
}
/**
* \brief Import the externally allocated \a pool of buffers
* \param[in] pool BufferPool of buffers to import