linux-v4l2: Add support for dv timings

plugins/linux-v4l2/data/locale/en-US.ini

@@ -3,6 +3,7 @@ Device="Device"
 Input="Input"
 ImageFormat="Video Format"
 VideoStandard="Video Standard"
+DVTiming="DV Timing"
 Resolution="Resolution"
 FrameRate="Frame Rate"
 LeaveUnchanged="Leave Unchanged"

plugins/linux-v4l2/v4l2-helpers.c

@@ -236,3 +236,40 @@ int_fast32_t v4l2_set_standard(int_fast32_t dev, int *standard)
 
 	return 0;
 }
+
+int_fast32_t v4l2_enum_dv_timing(int_fast32_t dev, struct v4l2_dv_timings *dvt,
+		int index)
+{
+	if (!dev || !dvt)
+		return -1;
+
+	struct v4l2_enum_dv_timings iter;
+	memset(&iter, 0, sizeof(iter));
+	iter.index   = index;
+
+	if (v4l2_ioctl(dev, VIDIOC_ENUM_DV_TIMINGS, &iter) < 0)
+		return -1;
+
+	memcpy(dvt, &iter.timings, sizeof(struct v4l2_dv_timings));
+
+	return 0;
+}
+
+int_fast32_t v4l2_set_dv_timing(int_fast32_t dev, int *timing)
+{
+	if (!dev || !timing)
+		return -1;
+
+	if (*timing == -1)
+		return 0;
+
+	struct v4l2_dv_timings dvt;
+
+	if (v4l2_enum_dv_timing(dev, &dvt, *timing) < 0)
+		return -1;
+
+	if (v4l2_ioctl(dev, VIDIOC_S_DV_TIMINGS, &dvt) < 0)
+		return -1;
+
+	return 0;
+}

plugins/linux-v4l2/v4l2-helpers.h

@@ -270,6 +270,29 @@ int_fast32_t v4l2_set_framerate(int_fast32_t dev, int *framerate);
  */
 int_fast32_t v4l2_set_standard(int_fast32_t dev, int *standard);
 
+/**
+ * Get the dv timing for an input with a specified index
+ *
+ * @param dev handle to the v4l2 device
+ * @param timing pointer to the timing structure to fill
+ * @param index index of the dv timing to fetch
+ *
+ * @return negative on failure
+ */
+int_fast32_t v4l2_enum_dv_timing(int_fast32_t dev, struct v4l2_dv_timings *dvt,
+		int index);
+/**
+ * Set a dv timing on the device
+ *
+ * Currently standard will not be changed on success or error.
+ *
+ * @param dev handle to the v4l2 device
+ * @param timing index of the timing to use or -1 to leave as is
+ *
+ * @return negative on failure
+ */
+int_fast32_t v4l2_set_dv_timing(int_fast32_t dev, int *timing);
+
 #ifdef __cplusplus
 }
 #endif

plugins/linux-v4l2/v4l2-input.c

@@ -57,6 +57,7 @@ struct v4l2_data {
 	int input;
 	int pixfmt;
 	int standard;
+	int dv_timing;
 	int resolution;
 	int framerate;
 	bool sys_timing;
@@ -216,6 +217,7 @@ static void v4l2_defaults(obs_data_t *settings)
 	obs_data_set_default_int(settings, "input", -1);
 	obs_data_set_default_int(settings, "pixelformat", -1);
 	obs_data_set_default_int(settings, "standard", -1);
+	obs_data_set_default_int(settings, "dv_timing", -1);
 	obs_data_set_default_int(settings, "resolution", -1);
 	obs_data_set_default_int(settings, "framerate", -1);
 	obs_data_set_default_bool(settings, "system_timing", false);
@@ -399,6 +401,43 @@ static void v4l2_standard_list(int dev, obs_property_t *prop)
 	}
 }
 
+/*
+ * List dv timings for the device
+ */
+static void v4l2_dv_timing_list(int dev, obs_property_t *prop)
+{
+	struct v4l2_dv_timings dvt;
+	struct dstr buf;
+	int index = 0;
+	dstr_init(&buf);
+
+	obs_property_list_clear(prop);
+
+	obs_property_list_add_int(prop, obs_module_text("LeaveUnchanged"), -1);
+
+	while (v4l2_enum_dv_timing(dev, &dvt, index) == 0) {
+		/* i do not pretend to understand, this is from qv4l2 ... */
+		double h    = (double) dvt.bt.height + dvt.bt.vfrontporch +
+				dvt.bt.vsync + dvt.bt.vbackporch +
+				dvt.bt.il_vfrontporch + dvt.bt.il_vsync +
+				dvt.bt.il_vbackporch;
+		double w    = (double) dvt.bt.width + dvt.bt.hfrontporch +
+				dvt.bt.hsync + dvt.bt.hbackporch;
+		double i    = (dvt.bt.interlaced) ? 2.0f : 1.0f;
+		double rate = (double) dvt.bt.pixelclock / (w * (h / i));
+
+		dstr_printf(&buf, "%ux%u%c %.2f",
+				dvt.bt.width, dvt.bt.height,
+				(dvt.bt.interlaced) ? 'i' : 'p', rate);
+
+		obs_property_list_add_int(prop, buf.array, index);
+
+		index++;
+	}
+
+	dstr_free(&buf);
+}
+
 /*
  * List resolutions for device and format
  */
@@ -556,30 +595,37 @@ static bool format_selected(obs_properties_t *props, obs_property_t *p,
 	uint32_t caps = 0;
 	if (v4l2_get_input_caps(dev, input, &caps) < 0)
 		return false;
-	caps &= V4L2_IN_CAP_STD;
+	caps &= V4L2_IN_CAP_STD | V4L2_IN_CAP_DV_TIMINGS;
 
 	obs_property_t *resolution = obs_properties_get(props, "resolution");
 	obs_property_t *framerate  = obs_properties_get(props, "framerate");
 	obs_property_t *standard   = obs_properties_get(props, "standard");
+	obs_property_t *dv_timing  = obs_properties_get(props, "dv_timing");
 
 	obs_property_set_visible(resolution, (!caps) ? true : false);
 	obs_property_set_visible(framerate,  (!caps) ? true : false);
 	obs_property_set_visible(standard,
 			(caps & V4L2_IN_CAP_STD) ? true : false);
+	obs_property_set_visible(dv_timing,
+			(caps & V4L2_IN_CAP_DV_TIMINGS) ? true : false);
 
 	if (!caps) {
 		v4l2_resolution_list(dev, obs_data_get_int(
 				settings, "pixelformat"), resolution);
 	}
 	if (caps & V4L2_IN_CAP_STD)
 		v4l2_standard_list(dev, standard);
+	if (caps & V4L2_IN_CAP_DV_TIMINGS)
+		v4l2_dv_timing_list(dev, dv_timing);
 
 	v4l2_close(dev);
 
 	if (!caps)
 		obs_property_modified(resolution, settings);
 	if (caps & V4L2_IN_CAP_STD)
 		obs_property_modified(standard, settings);
+	if (caps & V4L2_IN_CAP_DV_TIMINGS)
+		obs_property_modified(dv_timing, settings);
 
 	return true;
 }
@@ -673,6 +719,11 @@ static obs_properties_t *v4l2_properties(void *vptr)
 			OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
 	obs_property_set_visible(standard_list, false);
 
+	obs_property_t *dv_timing_list = obs_properties_add_list(props,
+			"dv_timing", obs_module_text("DVTiming"),
+			OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
+	obs_property_set_visible(dv_timing_list, false);
+
 	obs_property_t *resolution_list = obs_properties_add_list(props,
 			"resolution", obs_module_text("Resolution"),
 			OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
@@ -775,6 +826,15 @@ static void v4l2_init(struct v4l2_data *data)
 		data->resolution = -1;
 		data->framerate  = -1;
 	}
+	/* set dv timing if supported */
+	if (input_caps & V4L2_IN_CAP_DV_TIMINGS) {
+		if (v4l2_set_dv_timing(data->dev, &data->dv_timing) < 0) {
+			blog(LOG_ERROR, "Unable to set dv timing");
+			goto fail;
+		}
+		data->resolution = -1;
+		data->framerate  = -1;
+	}
 
 	/* set pixel format and resolution */
 	if (v4l2_set_format(data->dev, &data->resolution, &data->pixfmt,
@@ -837,6 +897,7 @@ static void v4l2_update(void *vptr, obs_data_t *settings)
 	data->input      = obs_data_get_int(settings, "input");
 	data->pixfmt     = obs_data_get_int(settings, "pixelformat");
 	data->standard   = obs_data_get_int(settings, "standard");
+	data->dv_timing  = obs_data_get_int(settings, "dv_timing");
 	data->resolution = obs_data_get_int(settings, "resolution");
 	data->framerate  = obs_data_get_int(settings, "framerate");
 	data->sys_timing = obs_data_get_bool(settings, "system_timing");