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[media] V4L: soc-camera: add a new packing for YUV 4:2:0 type formats 

12-bit formats, similar to YUV 4:2:0 occupy 3 bytes for each two pixels
and cannot be described by any of the existing SOC_MBUS_PACKING_* macros.
This patch adds a new one SOC_MBUS_PACKING_1_5X8 to describe such
formats and extends soc_mbus_samples_per_pixel() to support it.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski 2011-05-20 04:25:09 -03:00 committed by Mauro Carvalho Chehab
parent e9ceeced6f
commit cc552b620f
3 changed files with 28 additions and 7 deletions
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6
drivers/media/video/mx3_camera.c
View File

@ -756,8 +756,10 @@ static void configure_geometry(struct mx3_camera_dev *mx3_cam,
* the width parameter count the number of samples to
* capture to complete the whole image width.
*/
width *= soc_mbus_samples_per_pixel(fmt);
BUG_ON(width < 0);
unsigned int num, den;
int ret = soc_mbus_samples_per_pixel(fmt, &num, &den);
BUG_ON(ret < 0);
width = width * num / den;
}
/* Setup frame size - this cannot be changed on-the-fly... */

19
drivers/media/video/soc_mediabus.c
View File

@ -172,16 +172,27 @@ static const struct soc_mbus_lookup mbus_fmt[] = {
},
};
int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf)
int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
unsigned int *numerator, unsigned int *denominator)
{
switch (mf->packing) {
case SOC_MBUS_PACKING_NONE:
case SOC_MBUS_PACKING_EXTEND16:
return 1;
*numerator = 1;
*denominator = 1;
return 0;
case SOC_MBUS_PACKING_2X8_PADHI:
case SOC_MBUS_PACKING_2X8_PADLO:
return 2;
*numerator = 2;
*denominator = 1;
return 0;
case SOC_MBUS_PACKING_1_5X8:
*numerator = 3;
*denominator = 2;
return 0;
case SOC_MBUS_PACKING_VARIABLE:
*numerator = 0;
*denominator = 1;
return 0;
}
return -EINVAL;
@ -197,6 +208,8 @@ s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf)
case SOC_MBUS_PACKING_2X8_PADLO:
case SOC_MBUS_PACKING_EXTEND16:
return width * 2;
case SOC_MBUS_PACKING_1_5X8:
return width * 3 / 2;
case SOC_MBUS_PACKING_VARIABLE:
return 0;
}

10
include/media/soc_mediabus.h
View File

@ -16,12 +16,16 @@
/**
* enum soc_mbus_packing - data packing types on the media-bus
* @SOC_MBUS_PACKING_NONE: no packing, bit-for-bit transfer to RAM
* @SOC_MBUS_PACKING_NONE: no packing, bit-for-bit transfer to RAM, one
* sample represents one pixel
* @SOC_MBUS_PACKING_2X8_PADHI: 16 bits transferred in 2 8-bit samples, in the
* possibly incomplete byte high bits are padding
* @SOC_MBUS_PACKING_2X8_PADLO: as above, but low bits are padding
* @SOC_MBUS_PACKING_EXTEND16: sample width (e.g., 10 bits) has to be extended
* to 16 bits
* @SOC_MBUS_PACKING_VARIABLE: compressed formats with variable packing
* @SOC_MBUS_PACKING_1_5X8: used for packed YUV 4:2:0 formats, where 4
* pixels occupy 6 bytes in RAM
*/
enum soc_mbus_packing {
SOC_MBUS_PACKING_NONE,
@ -29,6 +33,7 @@ enum soc_mbus_packing {
SOC_MBUS_PACKING_2X8_PADLO,
SOC_MBUS_PACKING_EXTEND16,
SOC_MBUS_PACKING_VARIABLE,
SOC_MBUS_PACKING_1_5X8,
};
/**
@ -75,6 +80,7 @@ const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
enum v4l2_mbus_pixelcode code);
s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf);
int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf);
int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
unsigned int *numerator, unsigned int *denominator);
#endif