sys/v4l2/gstv4l2src.c: Add warning messages stating exactly why the latency query failed.

Original commit message from CVS:
* sys/v4l2/gstv4l2src.c: (gst_v4l2src_query):
Add warning messages stating exactly why the latency query failed.
* sys/v4l2/v4l2src_calls.c: (gst_v4l2src_set_capture):
In some cases, the negotiated framerate might be the default one which
is already set internally. But we still need to mark it down in fps_n
and fps_d so that the latency query can happen properly.

3 files changed, 20 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index 47545a83..efb736dd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2008-08-12  Edward Hervey  <edward.hervey@collabora.co.uk>
 
+	* sys/v4l2/gstv4l2src.c: (gst_v4l2src_query):
+	Add warning messages stating exactly why the latency query failed.
+	* sys/v4l2/v4l2src_calls.c: (gst_v4l2src_set_capture):
+	In some cases, the negotiated framerate might be the default one which
+	is already set internally. But we still need to mark it down in fps_n
+	and fps_d so that the latency query can happen properly.
+
+2008-08-12  Edward Hervey  <edward.hervey@collabora.co.uk>
+
 	* docs/plugins/inspect/plugin-1394.xml:
 	Whoops, forgot one doc file for people who can't/don't build the
 	raw1394 plugin.
diff --git a/sys/v4l2/gstv4l2src.c b/sys/v4l2/gstv4l2src.c
index ce4b2237..26e8ddfa 100644
--- a/sys/v4l2/gstv4l2src.c
+++ b/sys/v4l2/gstv4l2src.c
@@ -1071,12 +1071,18 @@ gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
       GstClockTime min_latency, max_latency;
 
       /* device must be open */
-      if (!GST_V4L2_IS_OPEN (src->v4l2object))
+      if (!GST_V4L2_IS_OPEN (src->v4l2object)) {
+        GST_WARNING_OBJECT (src,
+            "Can't give latency since device isn't open !");
         goto done;
+      }
 
       /* we must have a framerate */
-      if (src->fps_n <= 0 || src->fps_d <= 0)
+      if (src->fps_n <= 0 || src->fps_d <= 0) {
+        GST_WARNING_OBJECT (src,
+            "Can't give latency since framerate isn't fixated !");
         goto done;
+      }
 
       /* min latency is the time to capture one frame */
       min_latency =
diff --git a/sys/v4l2/v4l2src_calls.c b/sys/v4l2/v4l2src_calls.c
index c35d3ee2..02bb8d94 100644
--- a/sys/v4l2/v4l2src_calls.c
+++ b/sys/v4l2/v4l2src_calls.c
@@ -1214,7 +1214,9 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
   /* Note: V4L2 provides the frame interval, we have the frame rate */
   if (fractions_are_equal (stream.parm.capture.timeperframe.numerator,
           stream.parm.capture.timeperframe.denominator, fps_d, fps_n)) {
-    GST_LOG_OBJECT (v4l2src, "Desired framerate already set, nothing to do");
+    GST_LOG_OBJECT (v4l2src, "Desired framerate already set");
+    v4l2src->fps_n = fps_n;
+    v4l2src->fps_d = fps_d;
     goto done;
   }