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Date: Sat, 29 Jul 2023 02:40:11 +0800
From: Randy Li <ayaka@...lik.info>
To: Tomasz Figa <tfiga@...omium.org>
Cc: linux-media@...r.kernel.org,
Nicolas Dufresne <nicolas@...fresne.ca>,
randy.li@...aptics.com, Brian.Starkey@....com,
boris.brezillon@...labora.com, frkoenig@...omium.org,
hans.verkuil@...co.com, hiroh@...omium.org, hverkuil@...all.nl,
kernel@...labora.com, laurent.pinchart@...asonboard.com,
linux-kernel@...r.kernel.org, mchehab@...nel.org,
narmstrong@...libre.com, sakari.ailus@....fi,
stanimir.varbanov@...aro.org,
Helen Koike <helen.koike@...labora.com>
Subject: Re: [PATCH v7 2/9] media: vivid: Convert to v4l2_ext_pix_format
On 2023/7/28 15:22, Tomasz Figa wrote:
> On Fri, Jul 21, 2023 at 5:10 AM Nicolas Dufresne <nicolas@...fresne.ca> wrote:
>> Le mardi 18 juillet 2023 à 00:00 +0800, Randy Li a écrit :
>>> On 2023/7/13 18:39, Tomasz Figa wrote:
>>>> On Mon, Feb 06, 2023 at 12:33:01PM +0800, ayaka wrote:
>>>>> From: Helen Koike <helen.koike@...labora.com>
>>>>>
>>>>> Simplify Multi/Single planer API handling by converting to v4l2_ext_pix_format.
>>>>>
>>>>> Duplicate v4l2_ioctl_ops for touch devices. This is done to force the
>>>>> framework to use the ext hooks when the classic Api is used from
>>>>> userspace in Vid devices, and to keep touch devices with classic hook.
>>>>>
>>>>> Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
>>>>> Signed-off-by: Helen Koike <helen.koike@...labora.com>
>>>>> ---
>>>>> Changes in v7:
>>>>> - Force the userspace using the new APIs to operate non-touch drivers.
>>>> The primary objective of Linux development is not to break the
>>>> userspace. We can't just remove the old API, especially not from
>>>> existing drivers.
>>> Maybe I should create a new virtual driver here? It is impossible to
>>> support the new fourcc modifier with the old APIs.
>> For MPLANE, where backward compatibility was built into libv4l2 LD_PRELOAD
>> wrapper,
> Could you refresh my memory on what kind of backwards compatibility we
> had in libv4l2? Was that to make it possible to use new MPLANE-only
> drivers with old applications?
lib/libv4l-mplane/libv4l-mplane.c
I think application don't need to know the new MPLANE variant of pixel
formats or queue type.
>> it simply failed the cases that could not be supported (non contiguous
>> planes).
>>
>> regards,
>> Nicolas
>>
>>>> [snip]
>>>>> int vivid_try_fmt_vid_cap(struct file *file, void *priv,
>>>>> - struct v4l2_format *f)
>>>>> + struct v4l2_ext_pix_format *f)
>>>>> {
>>>>> - struct v4l2_pix_format_mplane *mp = &f->fmt.pix_mp;
>>>>> - struct v4l2_plane_pix_format *pfmt = mp->plane_fmt;
>>>>> struct vivid_dev *dev = video_drvdata(file);
>>>>> + struct v4l2_plane_pix_format *pfmt = f->plane_fmt;
>>>>> const struct vivid_fmt *fmt;
>>>>> unsigned bytesperline, max_bpl;
>>>>> unsigned factor = 1;
>>>>> unsigned w, h;
>>>>> unsigned p;
>>>>> - bool user_set_csc = !!(mp->flags & V4L2_PIX_FMT_FLAG_SET_CSC);
>>>> Why is this condition being removed?
>>> Because the v4l2_ext_pix has a struct for the colorspace?
>>>
>>> Would you like the idea that driver exports a buffer contains all the
>>> info for an enumeration ?
>>>
>>>> Best regards,
>>>> Tomasz
>>>>
>>>>> - fmt = vivid_get_format(dev, mp->pixelformat);
>>>>> + fmt = vivid_get_format(dev, f->pixelformat);
>>>>> if (!fmt) {
>>>>> dprintk(dev, 1, "Fourcc format (0x%08x) unknown.\n",
>>>>> - mp->pixelformat);
>>>>> - mp->pixelformat = V4L2_PIX_FMT_YUYV;
>>>>> - fmt = vivid_get_format(dev, mp->pixelformat);
>>>>> + f->pixelformat);
>>>>> + f->pixelformat = V4L2_PIX_FMT_YUYV;
>>>>> + fmt = vivid_get_format(dev, f->pixelformat);
>>>>> }
>>>>>
>>>>> - mp->field = vivid_field_cap(dev, mp->field);
>>>>> + f->field = vivid_field_cap(dev, f->field);
>>>>> if (vivid_is_webcam(dev)) {
>>>>> const struct v4l2_frmsize_discrete *sz =
>>>>> v4l2_find_nearest_size(webcam_sizes,
>>>>> VIVID_WEBCAM_SIZES, width,
>>>>> - height, mp->width, mp->height);
>>>>> + height, f->width, f->height);
>>>>>
>>>>> w = sz->width;
>>>>> h = sz->height;
>>>>> @@ -604,14 +603,14 @@ int vivid_try_fmt_vid_cap(struct file *file, void *priv,
>>>>> w = dev->src_rect.width;
>>>>> h = dev->src_rect.height;
>>>>> }
>>>>> - if (V4L2_FIELD_HAS_T_OR_B(mp->field))
>>>>> + if (V4L2_FIELD_HAS_T_OR_B(f->field))
>>>>> factor = 2;
>>>>> if (vivid_is_webcam(dev) ||
>>>>> (!dev->has_scaler_cap && !dev->has_crop_cap && !dev->has_compose_cap)) {
>>>>> - mp->width = w;
>>>>> - mp->height = h / factor;
>>>>> + f->width = w;
>>>>> + f->height = h / factor;
>>>>> } else {
>>>>> - struct v4l2_rect r = { 0, 0, mp->width, mp->height * factor };
>>>>> + struct v4l2_rect r = { 0, 0, f->width, f->height * factor };
>>>>>
>>>>> v4l2_rect_set_min_size(&r, &vivid_min_rect);
>>>>> v4l2_rect_set_max_size(&r, &vivid_max_rect);
>>>>> @@ -624,16 +623,15 @@ int vivid_try_fmt_vid_cap(struct file *file, void *priv,
>>>>> } else if (!dev->has_scaler_cap && !dev->has_crop_cap) {
>>>>> v4l2_rect_set_min_size(&r, &dev->src_rect);
>>>>> }
>>>>> - mp->width = r.width;
>>>>> - mp->height = r.height / factor;
>>>>> + f->width = r.width;
>>>>> + f->height = r.height / factor;
>>>>> }
>>>>>
>>>>> /* This driver supports custom bytesperline values */
>>>>>
>>>>> - mp->num_planes = fmt->buffers;
>>>>> for (p = 0; p < fmt->buffers; p++) {
>>>>> /* Calculate the minimum supported bytesperline value */
>>>>> - bytesperline = (mp->width * fmt->bit_depth[p]) >> 3;
>>>>> + bytesperline = (f->width * fmt->bit_depth[p]) >> 3;
>>>>> /* Calculate the maximum supported bytesperline value */
>>>>> max_bpl = (MAX_ZOOM * MAX_WIDTH * fmt->bit_depth[p]) >> 3;
>>>>>
>>>>> @@ -642,48 +640,49 @@ int vivid_try_fmt_vid_cap(struct file *file, void *priv,
>>>>> if (pfmt[p].bytesperline < bytesperline)
>>>>> pfmt[p].bytesperline = bytesperline;
>>>>>
>>>>> - pfmt[p].sizeimage = (pfmt[p].bytesperline * mp->height) /
>>>>> + pfmt[p].sizeimage = (pfmt[p].bytesperline * f->height) /
>>>>> fmt->vdownsampling[p] + fmt->data_offset[p];
>>>>> -
>>>>> - memset(pfmt[p].reserved, 0, sizeof(pfmt[p].reserved));
>>>>> }
>>>>> +
>>>>> + if (p < VIDEO_MAX_PLANES)
>>>>> + pfmt[p].sizeimage = 0;
>>>>> +
>>>>> for (p = fmt->buffers; p < fmt->planes; p++)
>>>>> - pfmt[0].sizeimage += (pfmt[0].bytesperline * mp->height *
>>>>> + pfmt[0].sizeimage += (pfmt[0].bytesperline * f->height *
>>>>> (fmt->bit_depth[p] / fmt->vdownsampling[p])) /
>>>>> (fmt->bit_depth[0] / fmt->vdownsampling[0]);
>>>>>
>>>>> - if (!user_set_csc || !v4l2_is_colorspace_valid(mp->colorspace))
>>>>> - mp->colorspace = vivid_colorspace_cap(dev);
>>>>> + if (!v4l2_is_colorspace_valid(f->colorspace))
>>>>> + f->colorspace = vivid_colorspace_cap(dev);
>>>>>
>>>>> - if (!user_set_csc || !v4l2_is_xfer_func_valid(mp->xfer_func))
>>>>> - mp->xfer_func = vivid_xfer_func_cap(dev);
>>>>> + if (!v4l2_is_xfer_func_valid(f->xfer_func))
>>>>> + f->xfer_func = vivid_xfer_func_cap(dev);
>>>>>
>>>>> if (fmt->color_enc == TGP_COLOR_ENC_HSV) {
>>>>> - if (!user_set_csc || !v4l2_is_hsv_enc_valid(mp->hsv_enc))
>>>>> - mp->hsv_enc = vivid_hsv_enc_cap(dev);
>>>>> + if (!v4l2_is_hsv_enc_valid(f->hsv_enc))
>>>>> + f->hsv_enc = vivid_hsv_enc_cap(dev);
>>>>> } else if (fmt->color_enc == TGP_COLOR_ENC_YCBCR) {
>>>>> - if (!user_set_csc || !v4l2_is_ycbcr_enc_valid(mp->ycbcr_enc))
>>>>> - mp->ycbcr_enc = vivid_ycbcr_enc_cap(dev);
>>>>> + if (!v4l2_is_ycbcr_enc_valid(f->ycbcr_enc))
>>>>> + f->ycbcr_enc = vivid_ycbcr_enc_cap(dev);
>>>>> } else {
>>>>> - mp->ycbcr_enc = vivid_ycbcr_enc_cap(dev);
>>>>> + f->ycbcr_enc = vivid_ycbcr_enc_cap(dev);
>>>>> }
>>>>>
>>>>> if (fmt->color_enc == TGP_COLOR_ENC_YCBCR ||
>>>>> fmt->color_enc == TGP_COLOR_ENC_RGB) {
>>>>> - if (!user_set_csc || !v4l2_is_quant_valid(mp->quantization))
>>>>> - mp->quantization = vivid_quantization_cap(dev);
>>>>> + if (!v4l2_is_quant_valid(f->quantization))
>>>>> + f->quantization = vivid_quantization_cap(dev);
>>>>> } else {
>>>>> - mp->quantization = vivid_quantization_cap(dev);
>>>>> + f->quantization = vivid_quantization_cap(dev);
>>>>> }
>>>>>
>>>>> - memset(mp->reserved, 0, sizeof(mp->reserved));
>>>>> + memset(f->reserved, 0, sizeof(f->reserved));
>>>>> return 0;
>>>>> }
>>>> [snip]
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