Extended command line option for set-dv-timings to support timings
calculations for reduced fps. This will allow supporting NTSC frame
rates like 29.97 or 59.94.
Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Prashant Laddha <prladdha@xxxxxxxxx>
---
utils/v4l2-ctl/v4l2-ctl-stds.cpp | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/utils/v4l2-ctl/v4l2-ctl-stds.cpp b/utils/v4l2-ctl/v4l2-ctl-stds.cpp
index e969d08..3987ba1 100644
--- a/utils/v4l2-ctl/v4l2-ctl-stds.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-stds.cpp
@@ -41,11 +41,15 @@ void stds_usage(void)
" index=<index>: use the index as provided by --list-dv-timings\n"
" or specify timings using cvt/gtf options as follows:\n"
" cvt/gtf,width=<width>,height=<height>,fps=<frames per sec>\n"
- " interlaced=<0/1>,reduced-blanking=<0/1/2>\n"
+ " interlaced=<0/1>,reduced-blanking=<0/1/2>,reduced-fps=<0/1>\n"
" The value of reduced-blanking, if greater than 0, indicates\n"
" that reduced blanking is to be used and the value indicate the\n"
" version. For gtf, there is no version 2 for reduced blanking, and\n"
" the value 1 or 2 will give same results.\n"
+ " reduced-fps = 1, slows down pixel clock by factor of 1000 / 1001, allowing\n"
+ " to support NTSC frame rates like 29.97 or 59.94.\n"
+ " Reduced fps flag takes effect only with reduced blanking version 2 and,\n"
+ " when refresh rate is an integer multiple of 6, say, fps = 24,30,60 etc.\n"
" or give a fully specified timings:\n"
" width=<width>,height=<height>,interlaced=<0/1>,\n"
" polarities=<polarities mask>,pixelclock=<pixelclock Hz>,\n"
@@ -152,6 +156,7 @@ enum timing_opts {
GTF,
FPS,
REDUCED_BLANK,
+ REDUCED_FPS,
};
static int parse_timing_subopt(char **subopt_str, int *value)
@@ -179,6 +184,7 @@ static int parse_timing_subopt(char **subopt_str, int *value)
"gtf",
"fps",
"reduced-blanking",
+ "reduced-fps",
NULL
};
@@ -209,6 +215,7 @@ static void get_cvt_gtf_timings(char *subopt, int standard,
int fps = 0;
int r_blank = 0;
int interlaced = 0;
+ bool reduced_fps = false;
bool timings_valid = false;
char *subopt_str = subopt;
@@ -234,6 +241,9 @@ static void get_cvt_gtf_timings(char *subopt, int standard,
case INTERLACED:
interlaced = opt_val;
break;
+ case REDUCED_FPS:
+ reduced_fps = (opt_val == 1) ? true : false;
+ break;
default:
break;
}
@@ -241,7 +251,7 @@ static void get_cvt_gtf_timings(char *subopt, int standard,
if (standard == V4L2_DV_BT_STD_CVT) {
timings_valid = calc_cvt_modeline(width, height, fps, r_blank,
- interlaced == 1 ? true : false, false, bt);
+ interlaced == 1 ? true : false, reduced_fps, bt);
} else {
timings_valid = calc_gtf_modeline(width, height, fps, r_blank,
interlaced == 1 ? true : false, bt);
--
1.9.1
--
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