File camsource-v4l-conf-video_window-overwrite.patch of Package camsource

From 03bfd892ee6a6454d92b10d1afd1f86fa0910fba Mon Sep 17 00:00:00 2001
From: David Mair <dmair@suse.com>
Date: Fri, 7 Feb 2020 13:39:12 -0700
Subject: [PATCH] opendev() in input_v4l.c functional execution is not
 implemented as described by the output messages it can display. One result
 is that it reads the configuration width and height settings and prepares
 them as the video source settings. But, it makes two unrelated attempts to
 set the video device source channel and if the second one succeeds it reads
 the current device grab window settings into the same structure it used to
 load the configuration, overwriting and losing the configuration. It then
 sets the grab window using the value it just got from the same device, i.e.
 redundant set device grab window to current grab window. It has the effect
 that if:
 
 * Another video application is used before running camsource
  - for the device camsource will use
  - Uses frame resolution different from that in the camsource configuration
 * Then the other application exited
 * camsource started
 
 The frame resolution used by camsource will be that set by the other
 application and not that in the camsource configuration.
 
 When reading what can be output to the console from the second set channel
 it says the "set grab window failed: Trying _again_ without the
 fps option" and performs a "set grab window" operation as the supposed
 "again" of a set video channel operation (when a full set video channel was
 already performed earlier in the code anyway).
 
 I modified the logic to operate as the messaging describes:
 
 * Perform a "get grab window" before loading the configuration
 * Load the configuration over the get grab window result
 * Perform a "set grab window" with the fps option
 * If that "set grab window" fails:
  - Perform a "set grab window" _again_ but without the fps
  
 This matches the behavior described in the messaging and camsource no
 longer loses the settings loaded from configuration.

---
 src/input_v4l.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/src/input_v4l.c b/src/input_v4l.c
index efbd7b3..f247d9b 100644
--- a/src/input_v4l.c
+++ b/src/input_v4l.c
@@ -145,7 +145,9 @@ closenerr:
 			printf("ioctl \"set input channel\" failed, continuing anyway: %s\n", strerror(errno));
 	}
 
-	memset(&vidwin, 0, sizeof(vidwin));
+	ret = v4l1_ioctl(newcamdev.fd, VIDIOCGWIN, &vidwin);
+	if (ret != 0)
+		memset(&vidwin, 0, sizeof(vidwin));
 
 	newcamdev.autobrightness = autobrightness;
 
@@ -158,7 +160,7 @@ closenerr:
 
 	vidwin.flags |= (fps & 0x3f) << 16;
 
-        ret = v4l1_ioctl(newcamdev.fd, VIDIOCSCHAN, &vidchan);
+	ret = v4l1_ioctl(newcamdev.fd, VIDIOCSWIN, &vidwin);
 	if (ret != 0)
 	{
 		printf("ioctl \"set grab window\" failed: %s\n", strerror(errno));
@@ -180,11 +182,6 @@ closenerr:
 			printf("we will continue anyway and hope that everything goes ok.\n");
 		}
 	}
-	else {
-                ret = v4l1_ioctl(newcamdev.fd, VIDIOCGWIN, &vidwin);
-		if (!ret)
-                        v4l1_ioctl(newcamdev.fd, VIDIOCSWIN, &vidwin);
-	}
 
         ret = v4l1_ioctl(newcamdev.fd, VIDIOCGPICT, &newcamdev.vidpic);
 	if (ret != 0)
-- 
2.25.0