Instead of using two tables to estimate the temporal decimation
factor, use a formula. This allows to get the closest fps, with
sounds better than the current tables.
Compile-tested only.
Signed-off-by: Mauro Carvalho Chehab <mche...@osg.samsung.com>
---
drivers/media/pci/tw686x/tw686x-video.c | 34 ++++++++++++---------------------
1 file changed, 12 insertions(+), 22 deletions(-)
diff --git a/drivers/media/pci/tw686x/tw686x-video.c
b/drivers/media/pci/tw686x/tw686x-video.c
index 253e10823ba3..0210fa304e4c 100644
--- a/drivers/media/pci/tw686x/tw686x-video.c
+++ b/drivers/media/pci/tw686x/tw686x-video.c
@@ -50,28 +50,18 @@ static unsigned int tw686x_fields_map(v4l2_std_id std,
unsigned int fps)
0x01041041, 0x01104411, 0x01111111, 0x04444445, 0x04511445,
0x05145145, 0x05151515, 0x05515455, 0x05551555, 0x05555555
};
-
- static const unsigned int std_625_50[26] = {
- 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6, 7, 7,
- 8, 8, 9, 10, 10, 11, 11, 12, 13, 13, 14, 14, 0
- };
-
- static const unsigned int std_525_60[31] = {
- 0, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7,
- 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 0, 0
- };
-
- unsigned int i;
-
- if (std & V4L2_STD_525_60) {
- if (fps >= ARRAY_SIZE(std_525_60))
- fps = 30;
- i = std_525_60[fps];
- } else {
- if (fps >= ARRAY_SIZE(std_625_50))
- fps = 25;
- i = std_625_50[fps];
- }
+ unsigned int i, max_fps;
+
+ if (std & V4L2_STD_525_60)
+ max_fps = 30;
+ else
+ max_fps = 25;
+
+ i = DIV_ROUND_CLOSEST(15 * fps, max_fps);
+ if (!i)
+ i = 1; /* Min possible fps */
+ else if (i > 14)
+ i = 0; /* fps = max_fps */
return map[i];
}
--
2.5.5
--
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