diff options
| -rw-r--r-- | yavta.c | 62 |
1 files changed, 59 insertions, 3 deletions
@@ -527,7 +527,8 @@ static int query_control(struct device *dev, unsigned int id, static int get_control(struct device *dev, const struct v4l2_query_ext_ctrl *query, - struct v4l2_ext_control *ctrl) + struct v4l2_ext_control *ctrl, + unsigned int which) { struct v4l2_ext_controls ctrls; struct v4l2_control old; @@ -536,7 +537,7 @@ static int get_control(struct device *dev, memset(&ctrls, 0, sizeof(ctrls)); memset(ctrl, 0, sizeof(*ctrl)); - ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(query->id); + ctrls.which = which; ctrls.count = 1; ctrls.controls = ctrl; @@ -1295,7 +1296,7 @@ static int video_get_control(struct device *dev, printf("current "); - ret = get_control(dev, query, &ctrl); + ret = get_control(dev, query, &ctrl, V4L2_CTRL_WHICH_CUR_VAL); if (ret < 0) { printf("n/a\n"); printf("unable to get control 0x%8.8x: %s (%d).\n", @@ -1478,6 +1479,51 @@ static void video_list_controls(struct device *dev) printf("No control found.\n"); } +static int video_reset_control(struct device *dev, + const struct v4l2_query_ext_ctrl *query) +{ + struct v4l2_ext_control ctrl = { .value = query->default_value, }; + int ret; + + if (query->flags & V4L2_CTRL_FLAG_DISABLED) + return 0; + + if (query->type == V4L2_CTRL_TYPE_CTRL_CLASS) + return 0; + + /* + * For controls with payloads the default value must be retrieved with + * a VIDIOC_G_EXT_CTRLS call. If the V4L2_CTRL_WHICH_DEF_VAL flag isn't + * supported by the kernel (it got introduced in v4.5, while controls + * with payloads were introduced in v3.17), there isn't much we can do, + * so skip resetting the control. + */ + if (query->flags & V4L2_CTRL_FLAG_HAS_PAYLOAD) { + ret = get_control(dev, query, &ctrl, V4L2_CTRL_WHICH_DEF_VAL); + if (ret < 0) + return 0; + } + + set_control(dev, query, &ctrl); + + if (query->flags & V4L2_CTRL_FLAG_HAS_PAYLOAD) + free(ctrl.ptr); + + return 1; +} + +static void video_reset_controls(struct device *dev) +{ + int ret; + + ret = video_for_each_control(dev, video_reset_control); + if (ret < 0) + return; + + if (ret) + printf("%u control%s reset.\n", ret, ret > 1 ? "s" : ""); +} + static void video_enum_frame_intervals(struct device *dev, __u32 pixelformat, unsigned int width, unsigned int height) { @@ -2099,6 +2145,7 @@ static void usage(const char *argv0) printf(" --premultiplied Color components are premultiplied by alpha value\n"); printf(" --queue-late Queue buffers after streamon, not before\n"); printf(" --requeue-last Requeue the last buffers before streamoff\n"); + printf(" --reset-controls Reset all available controls to their default value\n"); printf(" --timestamp-source Set timestamp source on output buffers [eof, soe]\n"); printf(" --skip n Skip the first n frames\n"); printf(" --sleep-forever Sleep forever after configuring the device\n"); @@ -2121,6 +2168,7 @@ static void usage(const char *argv0) #define OPT_PREMULTIPLIED 269 #define OPT_QUEUE_LATE 270 #define OPT_DATA_PREFIX 271 +#define OPT_RESET_CONTROLS 272 static struct option opts[] = { {"buffer-size", 1, 0, OPT_BUFFER_SIZE}, @@ -2149,6 +2197,7 @@ static struct option opts[] = { {"queue-late", 0, 0, OPT_QUEUE_LATE}, {"get-control", 1, 0, 'r'}, {"requeue-last", 0, 0, OPT_REQUEUE_LAST}, + {"reset-controls", 0, 0, OPT_RESET_CONTROLS}, {"realtime", 2, 0, 'R'}, {"size", 1, 0, 's'}, {"set-control", 1, 0, 'w'}, @@ -2176,6 +2225,7 @@ int main(int argc, char *argv[]) int do_enum_formats = 0, do_set_format = 0; int do_enum_inputs = 0, do_set_input = 0; int do_list_controls = 0, do_get_control = 0, do_set_control = 0; + int do_reset_controls = 0; int do_sleep_forever = 0, do_requeue_last = 0; int do_rt = 0, do_log_status = 0; int no_query = 0, do_queue_late = 0; @@ -2364,6 +2414,9 @@ int main(int argc, char *argv[]) case OPT_QUEUE_LATE: do_queue_late = 1; break; + case OPT_RESET_CONTROLS: + do_reset_controls = 1; + break; case OPT_REQUEUE_LAST: do_requeue_last = 1; break; @@ -2449,6 +2502,9 @@ int main(int argc, char *argv[]) if (do_list_controls) video_list_controls(&dev); + if (do_reset_controls) + video_reset_controls(&dev); + if (do_enum_formats) { printf("- Available formats:\n"); video_enum_formats(&dev, V4L2_BUF_TYPE_VIDEO_CAPTURE); |