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libcamera: v4l2_subdevice: Implement ENUM_FRAME_SIZES

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Implement format and size enumeration methods to list all the available
subdevice image resolutions and formats.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Jacopo Mondi
2019-02-19 12:11:04 +01:00
parent 54e6a3eb1f
commit 0559c740f2
4 changed files with 142 additions and 2 deletions
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src/libcamera/v4l2_subdevice.cpp
+87
View File
@@ -183,6 +183,59 @@ int V4L2Subdevice::setCompose(unsigned int pad, Rectangle *rect)
return setSelection(pad, V4L2_SEL_TGT_COMPOSE, rect);
}
/**
* \brief List the sub-device image resolutions and formats on \a pad
* \param[in] pad The 0-indexed pad number to enumerate formats on
*
* Retrieve a list of image formats and sizes on the \a pad of a video
* subdevice. Subdevices can report either a list of discrete sizes they
* support or a list of intervals expressed as a [min-max] sizes range.
*
* Each image size list is associated with a media bus pixel code for which
* the reported resolutions are supported.
*
* \return A map of image formats associated with a list of image sizes, or
* an empty map on error or if the pad does not exist
*/
const std::map<unsigned int, std::vector<SizeRange>>
V4L2Subdevice::formats(unsigned int pad)
{
std::map<unsigned int, std::vector<SizeRange>> formatMap = {};
struct v4l2_subdev_mbus_code_enum mbusEnum = {};
int ret;
if (pad >= entity_->pads().size()) {
LOG(V4L2Subdev, Error) << "Invalid pad: " << pad;
return formatMap;
}
mbusEnum.pad = pad;
mbusEnum.index = 0;
mbusEnum.which = V4L2_SUBDEV_FORMAT_ACTIVE;
while (true) {
ret = ioctl(fd_, VIDIOC_SUBDEV_ENUM_MBUS_CODE, &mbusEnum);
if (ret)
break;
ret = enumPadSizes(pad, mbusEnum.code,
&formatMap[mbusEnum.code]);
if (ret)
break;
mbusEnum.index++;
}
if (ret && (errno != EINVAL && errno != ENOTTY)) {
ret = -errno;
LOG(V4L2Subdev, Error)
<< "Unable to enumerate formats on pad " << pad
<< ": " << strerror(-ret);
formatMap.clear();
}
return formatMap;
}
/**
* \brief Retrieve the image format set on one of the V4L2 subdevice pads
* \param[in] pad The 0-indexed pad number the format is to be retrieved from
@@ -248,6 +301,40 @@ int V4L2Subdevice::setFormat(unsigned int pad, V4L2SubdeviceFormat *format)
return 0;
}
int V4L2Subdevice::enumPadSizes(unsigned int pad,unsigned int code,
std::vector<SizeRange> *sizes)
{
struct v4l2_subdev_frame_size_enum sizeEnum = {};
int ret;
sizeEnum.index = 0;
sizeEnum.pad = pad;
sizeEnum.code = code;
sizeEnum.which = V4L2_SUBDEV_FORMAT_ACTIVE;
while (true) {
ret = ioctl(fd_, VIDIOC_SUBDEV_ENUM_FRAME_SIZE, &sizeEnum);
if (ret)
break;
sizes->emplace_back(sizeEnum.min_width, sizeEnum.min_height,
sizeEnum.max_width, sizeEnum.max_height);
sizeEnum.index++;
}
if (ret && (errno != EINVAL && errno != ENOTTY)) {
ret = -errno;
LOG(V4L2Subdev, Error)
<< "Unable to enumerate sizes on pad " << pad
<< ": " << strerror(-ret);
sizes->clear();
return ret;
}
return 0;
}
int V4L2Subdevice::setSelection(unsigned int pad, unsigned int target,
Rectangle *rect)
{