[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7582/8267] gstreamer1.0-plugins-good: fix 4k playback for v4l2 decoder

[Emmanuele Bassi <ebassi src gnome org>]

commit 04f49ae8843a36fec37a47a3d16abc3b53b1f376
Author: Nicolas Dechesne <nicolas dechesne linaro org>
Date:   Mon Sep 4 10:23:34 2017 +0200

    gstreamer1.0-plugins-good: fix 4k playback for v4l2 decoder
    
    Backport a fix already merged upstream in master and 1.12 branch, it fixes 4K video
    playback on any platform that uses v4l2 codecs, such as Dragonboard 820c.
    
    (From OE-Core rev: b662944b28080dfb68833d4a81655262b04ada67)
    
    Signed-off-by: Nicolas Dechesne <nicolas dechesne linaro org>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 .../0001-v4l2-Fix-4K-colorimetry.patch             |   48 ++++++++++++++++++++
 .../gstreamer/gstreamer1.0-plugins-good_1.12.2.bb  |    1 +
 2 files changed, 49 insertions(+), 0 deletions(-)
---
diff --git a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good/0001-v4l2-Fix-4K-colorimetry.patch 
b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good/0001-v4l2-Fix-4K-colorimetry.patch
new file mode 100644
index 0000000..f78818a
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good/0001-v4l2-Fix-4K-colorimetry.patch
@@ -0,0 +1,48 @@
+From 545646cccba243236e10362fe7325f89be57da1f Mon Sep 17 00:00:00 2001
+From: Nicolas Dufresne <nicolas dufresne collabora com>
+Date: Tue, 18 Jul 2017 11:28:37 -0400
+Subject: [PATCH] v4l2: Fix 4K colorimetry
+
+Since 1.6, the transfer function for BT2020 has been changed from BT709
+to BT2020_12. It's the same function, but with more precision. As a side
+effect, the V4L2 colorpsace didn't match GStreamer colorspace. When
+GStreamer ended up making a guess, it would not match anything supported
+by V4L2 anymore. This this by using BT2020_12 for BT2020 colorspace and
+BT2020 transfer function in replacement of BT709 whenever a 4K
+resolution is detected.
+
+Upstream-Status: Backport
+Signed-off-by: Nicolas Dechesne <nicolas dechesne linaro org>
+
+---
+ sys/v4l2/gstv4l2object.c | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
+index 61244455f..aae2c55e7 100644
+--- a/sys/v4l2/gstv4l2object.c
++++ b/sys/v4l2/gstv4l2object.c
+@@ -1960,7 +1960,7 @@ gst_v4l2_object_get_colorspace (struct v4l2_format *fmt,
+     case V4L2_COLORSPACE_BT2020:
+       cinfo->range = GST_VIDEO_COLOR_RANGE_16_235;
+       cinfo->matrix = GST_VIDEO_COLOR_MATRIX_BT2020;
+-      cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
++      cinfo->transfer = GST_VIDEO_TRANSFER_BT2020_12;
+       cinfo->primaries = GST_VIDEO_COLOR_PRIMARIES_BT2020;
+       break;
+     case V4L2_COLORSPACE_SMPTE240M:
+@@ -2062,7 +2062,10 @@ gst_v4l2_object_get_colorspace (struct v4l2_format *fmt,
+ 
+   switch (transfer) {
+     case V4L2_XFER_FUNC_709:
+-      cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
++      if (fmt->fmt.pix.height > 2160)
++        cinfo->transfer = GST_VIDEO_TRANSFER_BT2020_12;
++      else
++        cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
+       break;
+     case V4L2_XFER_FUNC_SRGB:
+       cinfo->transfer = GST_VIDEO_TRANSFER_SRGB;
+-- 
+2.14.1
+
diff --git a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good_1.12.2.bb 
b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good_1.12.2.bb
index 3d38f00..f9593c9 100644
--- a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good_1.12.2.bb
+++ b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-good_1.12.2.bb
@@ -10,6 +10,7 @@ SRC_URI = " \
     file://avoid-including-sys-poll.h-directly.patch \
     file://ensure-valid-sentinel-for-gst_structure_get.patch \
     file://0001-introspection.m4-prefix-pkgconfig-paths-with-PKG_CON.patch \
+    file://0001-v4l2-Fix-4K-colorimetry.patch \
 "
 SRC_URI[md5sum] = "20254217d9805484532e08ff1c3aa296"
 SRC_URI[sha256sum] = "5591ee7208ab30289a30658a82b76bf87169c927572d9b794f3a41ed48e1ee96"