diff options
Diffstat (limited to 'include/media/v4l2-common.h')
| -rw-r--r-- | include/media/v4l2-common.h | 60 |
1 files changed, 51 insertions, 9 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index e0d95a7c5d48..54b689247937 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -316,21 +316,37 @@ void v4l_bound_align_image(unsigned int *width, unsigned int wmin, unsigned int salign); /** - * v4l2_find_nearest_format - find the nearest format size among a discrete - * set of resolutions. + * v4l2_find_nearest_size - Find the nearest size among a discrete + * set of resolutions contained in an array of a driver specific struct. * - * @sizes: array of &struct v4l2_frmsize_discrete image sizes. - * @num_sizes: length of @sizes array. + * @array: a driver specific array of image sizes + * @width_field: the name of the width field in the driver specific struct + * @height_field: the name of the height field in the driver specific struct * @width: desired width. * @height: desired height. * * Finds the closest resolution to minimize the width and height differences - * between what requested and the supported resolutions. + * between what requested and the supported resolutions. The size of the width + * and height fields in the driver specific must equal to that of u32, i.e. four + * bytes. + * + * Returns the best match or NULL if the length of the array is zero. */ -const struct v4l2_frmsize_discrete * -v4l2_find_nearest_format(const struct v4l2_frmsize_discrete *sizes, - const size_t num_sizes, - s32 width, s32 height); +#define v4l2_find_nearest_size(array, width_field, height_field, \ + width, height) \ + ({ \ + BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \ + sizeof((array)->height_field) != sizeof(u32)); \ + (typeof(&(*(array))))__v4l2_find_nearest_size( \ + (array), ARRAY_SIZE(array), sizeof(*(array)), \ + offsetof(typeof(*(array)), width_field), \ + offsetof(typeof(*(array)), height_field), \ + width, height); \ + }) +const void * +__v4l2_find_nearest_size(const void *array, size_t array_size, + size_t entry_size, size_t width_offset, + size_t height_offset, s32 width, s32 height); /** * v4l2_get_timestamp - helper routine to get a timestamp to be used when @@ -341,4 +357,30 @@ v4l2_find_nearest_format(const struct v4l2_frmsize_discrete *sizes, */ void v4l2_get_timestamp(struct timeval *tv); +/** + * v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by + * calling the g_frame_interval op of the given subdev. It only works + * for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the + * function name. + * + * @vdev: the struct video_device pointer. Used to determine the device caps. + * @sd: the sub-device pointer. + * @a: the VIDIOC_G_PARM argument. + */ +int v4l2_g_parm_cap(struct video_device *vdev, + struct v4l2_subdev *sd, struct v4l2_streamparm *a); + +/** + * v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by + * calling the s_frame_interval op of the given subdev. It only works + * for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the + * function name. + * + * @vdev: the struct video_device pointer. Used to determine the device caps. + * @sd: the sub-device pointer. + * @a: the VIDIOC_S_PARM argument. + */ +int v4l2_s_parm_cap(struct video_device *vdev, + struct v4l2_subdev *sd, struct v4l2_streamparm *a); + #endif /* V4L2_COMMON_H_ */ |