gst/matroska/: Try harder to extract the framerate for video tracks correctly and save it directly instead of convert...

Original commit message from CVS:
* gst/matroska/matroska-demux.c: (gst_matroska_demux_add_stream),
(gst_matroska_demux_video_caps):
* gst/matroska/matroska-ids.c:
(gst_matroska_track_init_video_context):
* gst/matroska/matroska-ids.h:
Try harder to extract the framerate for video tracks correctly and
save it directly instead of converting it back and forth a few
times. Mostly makes a difference for very small framerates (<1).
Fixes #380199.

3 files changed, 24 insertions, 8 deletions

diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index c09afa40..3c54b213 100644
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -660,7 +660,9 @@ gst_matroska_demux_add_stream (GstMatroskaDemux * demux)
                 res = FALSE;
                 break;
               }
-              context->default_duration = GST_SECOND * (1. / num);
+              context->default_duration =
+                  gst_gdouble_to_guint64 ((gdouble) GST_SECOND * (1.0 / num));
+              videocontext->default_fps = num;
               break;
             }
 
@@ -3615,14 +3617,26 @@ gst_matroska_demux_video_caps (GstMatroskaTrackVideoContext *
             videocontext->display_height * videocontext->pixel_width, NULL);
       }
 
-      if (context->default_duration > 0) {
-        GValue fps_double = { 0 };
-        GValue fps_fraction = { 0 };
+      if (videocontext->default_fps > 0.0) {
+        GValue fps_double = { 0, };
+        GValue fps_fraction = { 0, };
 
         g_value_init (&fps_double, G_TYPE_DOUBLE);
         g_value_init (&fps_fraction, GST_TYPE_FRACTION);
-        g_value_set_double (&fps_double,
-            gst_guint64_to_gdouble (GST_SECOND / context->default_duration));
+        g_value_set_double (&fps_double, videocontext->default_fps);
+        g_value_transform (&fps_double, &fps_fraction);
+
+        gst_structure_set_value (structure, "framerate", &fps_fraction);
+        g_value_unset (&fps_double);
+        g_value_unset (&fps_fraction);
+      } else if (context->default_duration > 0) {
+        GValue fps_double = { 0, };
+        GValue fps_fraction = { 0, };
+
+        g_value_init (&fps_double, G_TYPE_DOUBLE);
+        g_value_init (&fps_fraction, GST_TYPE_FRACTION);
+        g_value_set_double (&fps_double, (gdouble) GST_SECOND * 1.0 /
+            gst_guint64_to_gdouble (context->default_duration));
         g_value_transform (&fps_double, &fps_fraction);
 
         gst_structure_set_value (structure, "framerate", &fps_fraction);
diff --git a/gst/matroska/matroska-ids.c b/gst/matroska/matroska-ids.c
index db8261ab..ec71a568 100644
--- a/gst/matroska/matroska-ids.c
+++ b/gst/matroska/matroska-ids.c
@@ -56,6 +56,7 @@ gst_matroska_track_init_video_context (GstMatroskaTrackContext ** p_context)
   video_context->eye_mode = 0;
   video_context->asr_mode = 0;
   video_context->fourcc = 0;
+  video_context->default_fps = 0.0;
   return TRUE;
 }
 
diff --git a/gst/matroska/matroska-ids.h b/gst/matroska/matroska-ids.h
index 5a5e5722..e570599d 100644
--- a/gst/matroska/matroska-ids.h
+++ b/gst/matroska/matroska-ids.h
@@ -292,8 +292,9 @@ typedef struct _GstMatroskaTrackContext {
 typedef struct _GstMatroskaTrackVideoContext {
   GstMatroskaTrackContext parent;
 
-  guint         pixel_width, pixel_height,
-                display_width, display_height;
+  guint         pixel_width, pixel_height;
+  guint         display_width, display_height;
+  gdouble       default_fps;
   GstMatroskaEyeMode eye_mode;
   GstMatroskaAspectRatioMode asr_mode;
   guint32       fourcc;