From f4f389483658e23ca7f410cc0633ce3fd358f70c Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Fri, 12 Jun 2015 16:47:03 +0200
Subject: [PATCH] video-scaler: Enforce same taps on Y and UV scalers for
 merged formats

Make sure we have the same number of taps for the Y and UV scalers so
that the scalers can be merged correctly.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=749764
---
 gst-libs/gst/video/video-converter.c |  3 ++-
 gst-libs/gst/video/video-scaler.c    | 16 ++++++++++++++++
 gst-libs/gst/video/video-scaler.h    |  1 +
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/gst-libs/gst/video/video-converter.c b/gst-libs/gst/video/video-converter.c
index 2fa64fa6b6..c90ddaf791 100644
--- a/gst-libs/gst/video/video-converter.c
+++ b/gst-libs/gst/video/video-converter.c
@@ -4040,7 +4040,8 @@ setup_scale (GstVideoConverter * convert)
                 in_width), GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (out_finfo,
                 GST_VIDEO_COMP_Y, out_width), convert->config);
         uv_scaler =
-            gst_video_scaler_new (method, GST_VIDEO_SCALER_FLAG_NONE, taps,
+            gst_video_scaler_new (method, GST_VIDEO_SCALER_FLAG_NONE,
+            gst_video_scaler_get_max_taps (y_scaler),
             GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (in_finfo, GST_VIDEO_COMP_U,
                 in_width), GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (out_finfo,
                 GST_VIDEO_COMP_U, out_width), convert->config);
diff --git a/gst-libs/gst/video/video-scaler.c b/gst-libs/gst/video/video-scaler.c
index 25e8b015a6..881fd08922 100644
--- a/gst-libs/gst/video/video-scaler.c
+++ b/gst-libs/gst/video/video-scaler.c
@@ -248,6 +248,22 @@ gst_video_scaler_free (GstVideoScaler * scale)
   g_slice_free (GstVideoScaler, scale);
 }
 
+/**
+ * gst_video_scaler_get_max_taps:
+ * @scale: a #GstVideoScaler
+ *
+ * Get the maximum number of taps for @scale.
+ *
+ * Returns: the maximum number of taps
+ */
+guint
+gst_video_scaler_get_max_taps (GstVideoScaler * scale)
+{
+  g_return_val_if_fail (scale != NULL, 0);
+
+  return scale->resampler.max_taps;
+}
+
 /**
  * gst_video_scaler_get_coeff:
  * @scale: a #GstVideoScaler
diff --git a/gst-libs/gst/video/video-scaler.h b/gst-libs/gst/video/video-scaler.h
index 891a49de02..e4b752fd22 100644
--- a/gst-libs/gst/video/video-scaler.h
+++ b/gst-libs/gst/video/video-scaler.h
@@ -57,6 +57,7 @@ GstVideoScaler *      gst_video_scaler_new            (GstVideoResamplerMethod m
                                                        GstStructure * options);
 void                  gst_video_scaler_free           (GstVideoScaler *scale);
 
+guint                 gst_video_scaler_get_max_taps   (GstVideoScaler *scale);
 const gdouble *       gst_video_scaler_get_coeff      (GstVideoScaler *scale,
                                                        guint out_offset,
                                                        guint *in_offset,