From 99b6a018cc70f73d067e26f2c79b18b98f0f9b57 Mon Sep 17 00:00:00 2001
From: fryshorts <leonhard@in-verted.de>
Date: Tue, 24 Feb 2015 22:18:24 +0100
Subject: [PATCH] linux-v4l2: Add helper function to set dv timing

Add a helper function to set the dv timing for the input.
---
 plugins/linux-v4l2/v4l2-helpers.c | 19 +++++++++++++++++++
 plugins/linux-v4l2/v4l2-helpers.h | 11 +++++++++++
 2 files changed, 30 insertions(+)

diff --git a/plugins/linux-v4l2/v4l2-helpers.c b/plugins/linux-v4l2/v4l2-helpers.c
index 080a83fb1..5bed14c7c 100644
--- a/plugins/linux-v4l2/v4l2-helpers.c
+++ b/plugins/linux-v4l2/v4l2-helpers.c
@@ -254,3 +254,22 @@ int_fast32_t v4l2_enum_dv_timing(int_fast32_t dev, struct v4l2_dv_timings *dvt,
 
 	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;
+}
diff --git a/plugins/linux-v4l2/v4l2-helpers.h b/plugins/linux-v4l2/v4l2-helpers.h
index 390fac669..f3860d094 100644
--- a/plugins/linux-v4l2/v4l2-helpers.h
+++ b/plugins/linux-v4l2/v4l2-helpers.h
@@ -281,6 +281,17 @@ int_fast32_t v4l2_set_standard(int_fast32_t dev, int *standard);
  */
 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
 }