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Date: Tue, 18 Jul 2023 00:00:23 +0800
From: Randy Li <ayaka@...lik.info>
To: Tomasz Figa <tfiga@...omium.org>
Cc: linux-media@...r.kernel.org, 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, nicolas@...fresne.ca,
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 2023/7/13 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.
>
> [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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