[RFC PATCH v3 07/11] [media] vimc: cap: Support several image formats

Helen Koike
2017-06-03T03:01:13Z

Allow user space to change the image format as the frame size, the
pixel format, colorspace, quantization, field YCbCr encoding
and the transfer function

Signed-off-by: Helen Koike <helen.koike@collabora.com>

---

Changes in v3:
[media] vimc: cap: Support several image formats
- use *_DEFAULT macros for colorimetry in the default format
- clamp height and width of the image by an even value
- is user try to set colorspace to an invalid format, set all
colorimetry parameters to _DEFAULT
- remove V4L2_FMT_FLAG_COMPRESSED from vimc_cap_enum_fmt_vid_cap
- remove V4L2_BUF_TYPE_VIDEO_CAPTURE from vimc_cap_enum_fmt_vid_cap
- increase step_width and step_height to 2 instead of 1
- remove link validate function, use the one in vimc-common.c

Changes in v2:
[media] vimc: cap: Support several image formats
- this is a new commit in the serie (the old one was splitted in two)
- allow user space to change all fields from struct v4l2_pix_format
(e.g. colospace, quantization, field, xfer_func, ycbcr_enc)
- link_validate and try_fmt: also checks colospace, quantization, field, xfer_func, ycbcr_enc
- add struct v4l2_pix_format fmt_default
- add enum_framesizes
- enum_fmt_vid_cap: enumerate all formats from vimc_pix_map_table
- add mode dev_dbg

---
drivers/media/platform/vimc/vimc-capture.c | 131 +++++++++++++++++++++++++----
1 file changed, 115 insertions(+), 16 deletions(-)

diff --git a/drivers/media/platform/vimc/vimc-capture.c b/drivers/media/platform/vimc/vimc-capture.c
index 5bdecd1..e943267 100644
--- a/drivers/media/platform/vimc/vimc-capture.c
+++ b/drivers/media/platform/vimc/vimc-capture.c
@@ -40,6 +40,14 @@ struct vimc_cap_device {
struct media_pipeline pipe;
};

+static const struct v4l2_pix_format fmt_default = {
+ .width = 640,
+ .height = 480,
+ .pixelformat = V4L2_PIX_FMT_RGB24,
+ .field = V4L2_FIELD_NONE,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+};
+
struct vimc_cap_buffer {
/*
* struct vb2_v4l2_buffer must be the first element
@@ -73,7 +81,7 @@ static void vimc_cap_get_format(struct vimc_ent_device *ved,
*fmt = vcap->format;
}

-static int vimc_cap_fmt_vid_cap(struct file *file, void *priv,
+static int vimc_cap_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct vimc_cap_device *vcap = video_drvdata(file);
@@ -83,16 +91,112 @@ static int vimc_cap_fmt_vid_cap(struct file *file, void *priv,
return 0;
}

+static int vimc_cap_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct v4l2_pix_format *format = &f->fmt.pix;
+ const struct vimc_pix_map *vpix;
+
+ format->width = clamp_t(u32, format->width, VIMC_FRAME_MIN_WIDTH,
+ VIMC_FRAME_MAX_WIDTH) & ~1;
+ format->height = clamp_t(u32, format->height, VIMC_FRAME_MIN_HEIGHT,
+ VIMC_FRAME_MAX_HEIGHT) & ~1;
+
+ /* Don't accept a pixelformat that is not on the table */
+ vpix = vimc_pix_map_by_pixelformat(format->pixelformat);
+ if (!vpix) {
+ format->pixelformat = fmt_default.pixelformat;
+ vpix = vimc_pix_map_by_pixelformat(format->pixelformat);
+ }
+ /* TODO: Add support for custom bytesperline values */
+ format->bytesperline = format->width * vpix->bpp;
+ format->sizeimage = format->bytesperline * format->height;
+
+ if (format->field == V4L2_FIELD_ANY)
+ format->field = fmt_default.field;
+
+ if (format->colorspace == V4L2_COLORSPACE_DEFAULT)
+ format->colorspace = fmt_default.colorspace;
+
+ /* Check if values are out of range */
+ if (format->colorspace > V4L2_COLORSPACE_DCI_P3) {
+ format->colorspace = fmt_default.colorspace;
+ format->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+ format->quantization = V4L2_QUANTIZATION_DEFAULT;
+ format->xfer_func = V4L2_XFER_FUNC_DEFAULT;
+ }
+ if (format->ycbcr_enc > V4L2_YCBCR_ENC_SMPTE240M)
+ format->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+ if (format->quantization > V4L2_QUANTIZATION_LIM_RANGE)
+ format->quantization = V4L2_QUANTIZATION_DEFAULT;
+ if (format->xfer_func > V4L2_XFER_FUNC_SMPTE2084)
+ format->xfer_func = V4L2_XFER_FUNC_DEFAULT;
+ return 0;
+}
+
+static int vimc_cap_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct vimc_cap_device *vcap = video_drvdata(file);
+
+ /* Do not change the format while stream is on */
+ if (vb2_is_busy(&vcap->queue))
+ return -EBUSY;
+
+ vimc_cap_try_fmt_vid_cap(file, priv, f);
+
+ dev_dbg(vcap->vdev.v4l2_dev->dev, "%s: format update: "
+ "old:%dx%d (0x%x, %d, %d, %d, %d) "
+ "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vcap->vdev.name,
+ /* old */
+ vcap->format.width, vcap->format.height,
+ vcap->format.pixelformat, vcap->format.colorspace,
+ vcap->format.quantization, vcap->format.xfer_func,
+ vcap->format.ycbcr_enc,
+ /* new */
+ f->fmt.pix.width, f->fmt.pix.height,
+ f->fmt.pix.pixelformat, f->fmt.pix.colorspace,
+ f->fmt.pix.quantization, f->fmt.pix.xfer_func,
+ f->fmt.pix.ycbcr_enc);
+
+ vcap->format = f->fmt.pix;
+
+ return 0;
+}
+
static int vimc_cap_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
- struct vimc_cap_device *vcap = video_drvdata(file);
+ const struct vimc_pix_map *vpix = vimc_pix_map_by_index(f->index);
+
+ if (!vpix)
+ return -EINVAL;
+
+ f->pixelformat = vpix->pixelformat;
+
+ return 0;
+}
+
+static int vimc_cap_enum_framesizes(struct file *file, void *fh,
+ struct v4l2_frmsizeenum *fsize)
+{
+ const struct vimc_pix_map *vpix;

- if (f->index > 0)
+ if (fsize->index)
return -EINVAL;

- /* We only support one format for now */
- f->pixelformat = vcap->format.pixelformat;
+ /* Only accept code in the pix map table */
+ vpix = vimc_pix_map_by_code(fsize->pixel_format);
+ if (!vpix)
+ return -EINVAL;
+
+ fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
+ fsize->stepwise.min_width = VIMC_FRAME_MIN_WIDTH;
+ fsize->stepwise.max_width = VIMC_FRAME_MAX_WIDTH;
+ fsize->stepwise.min_height = VIMC_FRAME_MIN_HEIGHT;
+ fsize->stepwise.max_height = VIMC_FRAME_MAX_HEIGHT;
+ fsize->stepwise.step_width = 2;
+ fsize->stepwise.step_height = 2;

return 0;
}
@@ -110,10 +214,11 @@ static const struct v4l2_file_operations vimc_cap_fops = {
static const struct v4l2_ioctl_ops vimc_cap_ioctl_ops = {
.vidioc_querycap = vimc_cap_querycap,

- .vidioc_g_fmt_vid_cap = vimc_cap_fmt_vid_cap,
- .vidioc_s_fmt_vid_cap = vimc_cap_fmt_vid_cap,
- .vidioc_try_fmt_vid_cap = vimc_cap_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = vimc_cap_g_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = vimc_cap_s_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = vimc_cap_try_fmt_vid_cap,
.vidioc_enum_fmt_vid_cap = vimc_cap_enum_fmt_vid_cap,
+ .vidioc_enum_framesizes = vimc_cap_enum_framesizes,

.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
@@ -360,15 +465,9 @@ struct vimc_ent_device *vimc_cap_create(struct v4l2_device *v4l2_dev,
INIT_LIST_HEAD(&vcap->buf_list);
spin_lock_init(&vcap->qlock);

- /* Set the frame format (this is hardcoded for now) */
- vcap->format.width = 640;
- vcap->format.height = 480;
- vcap->format.pixelformat = V4L2_PIX_FMT_RGB24;
- vcap->format.field = V4L2_FIELD_NONE;
- vcap->format.colorspace = V4L2_COLORSPACE_SRGB;
-
+ /* Set default frame format */
+ vcap->format = fmt_default;
vpix = vimc_pix_map_by_pixelformat(vcap->format.pixelformat);
-
vcap->format.bytesperline = vcap->format.width * vpix->bpp;
vcap->format.sizeimage = vcap->format.bytesperline *
vcap->format.height;
--
2.7.4