On 02/21/16 22:29, Sakari Ailus wrote:
> Add a new topic option for -h to allow listing supported media bus codes
> in conversion functions. This is useful in figuring out which media bus
> codes are actually supported by the library. The numeric values of the
> codes are listed as well.
>
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> ---
> utils/media-ctl/options.c | 42 ++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 38 insertions(+), 4 deletions(-)
>
> diff --git a/utils/media-ctl/options.c b/utils/media-ctl/options.c
> index 0afc9c2..55cdd29 100644
> --- a/utils/media-ctl/options.c
> +++ b/utils/media-ctl/options.c
> @@ -22,7 +22,9 @@
> #include <getopt.h>
> #include <stdio.h>
> #include <stdlib.h>
> +#include <string.h>
> #include <unistd.h>
> +#include <v4l2subdev.h>
>
> #include <linux/videodev2.h>
>
> @@ -45,7 +47,8 @@ static void usage(const char *argv0)
> printf("-V, --set-v4l2 v4l2 Comma-separated list of formats to setup\n");
> printf(" --get-v4l2 pad Print the active format on a given pad\n");
> printf(" --set-dv pad Configure DV timings on a given pad\n");
> - printf("-h, --help Show verbose help and exit\n");
> + printf("-h, --help[=topic] Show verbose help and exit\n");
> + printf(" topics: mbus-fmt: List supported media bus pixel codes\n");
> printf("-i, --interactive Modify links interactively\n");
> printf("-l, --links links Comma-separated list of link descriptors to setup\n");
> printf("-p, --print-topology Print the device topology\n");
> @@ -100,7 +103,7 @@ static struct option opts[] = {
> {"get-format", 1, 0, OPT_GET_FORMAT},
> {"get-v4l2", 1, 0, OPT_GET_FORMAT},
> {"set-dv", 1, 0, OPT_SET_DV},
> - {"help", 0, 0, 'h'},
> + {"help", 2, 0, 'h'},
> {"interactive", 0, 0, 'i'},
> {"links", 1, 0, 'l'},
> {"print-dot", 0, 0, OPT_PRINT_DOT},
> @@ -110,6 +113,27 @@ static struct option opts[] = {
> { },
> };
>
> +void list_mbus_formats(void)
> +{
> + unsigned int ncodes;
> + const unsigned int *code = v4l2_subdev_pixelcode_list(&ncodes);
> +
> + printf("Supported media bus pixel codes\n");
> +
> + for (ncodes++; ncodes; ncodes--, code++) {
Huh? Just do:
while (ncodes--) {
....
code++;
}
That for loop is weird.
Hans
> + const char *str = v4l2_subdev_pixelcode_to_string(*code);
> + int spaces = 30 - (int)strlen(str);
> +
> + if (*code == 0)
> + break;
> +
> + if (spaces < 0)
> + spaces = 0;
> +
> + printf("\t%s %*c (0x%8.8x)\n", str, spaces, ' ', *code);
> + }
> +}
> +
> int parse_cmdline(int argc, char **argv)
> {
> int opt;
> @@ -120,7 +144,8 @@ int parse_cmdline(int argc, char **argv)
> }
>
> /* parse options */
> - while ((opt = getopt_long(argc, argv, "d:e:f:hil:prvV:", opts, NULL)) != -1) {
> + while ((opt = getopt_long(argc, argv, "d:e:f:h::il:prvV:",
> + opts, NULL)) != -1) {
> switch (opt) {
> case 'd':
> media_opts.devname = optarg;
> @@ -142,7 +167,16 @@ int parse_cmdline(int argc, char **argv)
> break;
>
> case 'h':
> - usage(argv[0]);
> + if (optarg) {
> + if (!strcmp(optarg, "mbus-fmt"))
> + list_mbus_formats();
> + else
> + fprintf(stderr,
> + "Unknown topic \"%s\"\n",
> + optarg);
> + } else {
> + usage(argv[0]);
> + }
> exit(0);
>
> case 'i':
>
--
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