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V4L/DVB (11902): pxa-camera: Use v4l bounding/alignment function

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The v4l function has a better algorithm for aligning image size.

For instance the old code would change 159x243 into 156x240 to meet the
alignment requirements.  The new function will use 160x243, which is a lot
closer to what was asked for originally.

Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Trent Piepho 2009-05-30 21:45:46 -03:00 committed by Mauro Carvalho Chehab
parent b0d3159be9
commit 4a6b8df213
1 changed files with 7 additions and 27 deletions
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34
drivers/media/video/pxa_camera.c
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@ -162,13 +162,6 @@
CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
CICR0_EOFM | CICR0_FOM)
/*
* YUV422P picture size should be a multiple of 16, so the heuristic aligns
* height, width on 4 byte boundaries to reach the 16 multiple for the size.
*/
#define YUV422P_X_Y_ALIGN 4
#define YUV422P_SIZE_ALIGN YUV422P_X_Y_ALIGN * YUV422P_X_Y_ALIGN
/*
* Structures
*/
@ -1398,28 +1391,15 @@ static int pxa_camera_try_fmt(struct soc_camera_device *icd,
return -EINVAL;
}
/* limit to pxa hardware capabilities */
if (pix->height < 32)
pix->height = 32;
if (pix->height > 2048)
pix->height = 2048;
if (pix->width < 48)
pix->width = 48;
if (pix->width > 2048)
pix->width = 2048;
pix->width &= ~0x01;
/*
* YUV422P planar format requires images size to be a 16 bytes
* multiple. If not, zeros will be inserted between Y and U planes, and
* U and V planes, and YUV422P standard would be violated.
* Limit to pxa hardware capabilities. YUV422P planar format requires
* images size to be a multiple of 16 bytes. If not, zeros will be
* inserted between Y and U planes, and U and V planes, which violates
* the YUV422P standard.
*/
if (xlate->host_fmt->fourcc == V4L2_PIX_FMT_YUV422P) {
if (!IS_ALIGNED(pix->width * pix->height, YUV422P_SIZE_ALIGN))
pix->height = ALIGN(pix->height, YUV422P_X_Y_ALIGN);
if (!IS_ALIGNED(pix->width * pix->height, YUV422P_SIZE_ALIGN))
pix->width = ALIGN(pix->width, YUV422P_X_Y_ALIGN);
}
v4l_bound_align_image(&pix->width, 48, 2048, 1,
&pix->height, 32, 2048, 0,
xlate->host_fmt->fourcc == V4L2_PIX_FMT_YUV422P ? 4 : 0);
pix->bytesperline = pix->width *
DIV_ROUND_UP(xlate->host_fmt->depth, 8);