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[media] s5p-jpeg: Prevent JPEG 4:2:0 > YUV 4:2:0 decompression 

Prevent decompression of a JPEG 4:2:0 with odd width to
the YUV 4:2:0 compliant formats for Exynos4x12 SoCs and
adjust capture format to RGB565 in such a case. This is
required because the configuration would produce a raw
image with broken luma component.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Jacek Anaszewski 2014-04-10 04:32:17 -03:00 committed by Mauro Carvalho Chehab
parent b2254d6fdd
commit 2caeeb0c16
1 changed files with 22 additions and 3 deletions
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25
drivers/media/platform/s5p-jpeg/jpeg-core.c
View File

@ -1064,15 +1064,17 @@ static int s5p_jpeg_try_fmt_vid_cap(struct file *file, void *priv,
return -EINVAL;
}
if ((ctx->jpeg->variant->version != SJPEG_EXYNOS4) ||
(ctx->mode != S5P_JPEG_DECODE))
goto exit;
/*
* The exynos4x12 device requires resulting YUV image
* subsampling not to be lower than the input jpeg subsampling.
* If this requirement is not met then downgrade the requested
* capture format to the one with subsampling equal to the input jpeg.
*/
if ((ctx->jpeg->variant->version == SJPEG_EXYNOS4) &&
(ctx->mode == S5P_JPEG_DECODE) &&
(fmt->flags & SJPEG_FMT_NON_RGB) &&
if ((fmt->flags & SJPEG_FMT_NON_RGB) &&
(fmt->subsampling < ctx->subsampling)) {
ret = s5p_jpeg_adjust_fourcc_to_subsampling(ctx->subsampling,
fmt->fourcc,
@ -1085,6 +1087,23 @@ static int s5p_jpeg_try_fmt_vid_cap(struct file *file, void *priv,
FMT_TYPE_CAPTURE);
}
/*
* Decompression of a JPEG file with 4:2:0 subsampling and odd
* width to the YUV 4:2:0 compliant formats produces a raw image
* with broken luma component. Adjust capture format to RGB565
* in such a case.
*/
if (ctx->subsampling == V4L2_JPEG_CHROMA_SUBSAMPLING_420 &&
(ctx->out_q.w & 1) &&
(pix->pixelformat == V4L2_PIX_FMT_NV12 ||
pix->pixelformat == V4L2_PIX_FMT_NV21 ||
pix->pixelformat == V4L2_PIX_FMT_YUV420)) {
pix->pixelformat = V4L2_PIX_FMT_RGB565;
fmt = s5p_jpeg_find_format(ctx, pix->pixelformat,
FMT_TYPE_CAPTURE);
}
exit:
return vidioc_try_fmt(f, fmt, ctx, FMT_TYPE_CAPTURE);
}