gstreamer1.0: Fix QoS/lateness checking if subclass implements prepare/prepare_list vfuncs

In function gst_base_sink_chain_unlocked(), it should calculate jitter based
on current media clock, rather than just passing 0.
Or it will drop all the frames when rewind in slow speed, such as -2X.

(From OE-Core rev: 68591de72e27a985242d6ff19fffb80f69869003)

Signed-off-by: Yuqing Zhu <b54851@freescale.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 70 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/gstreamer/gstreamer1.0/0002-basesink-Fix-QoS-lateness-checking-if-subclass-imple.patch b/meta/recipes-multimedia/gstreamer/gstreamer1.0/0002-basesink-Fix-QoS-lateness-checking-if-subclass-imple.patch
new file mode 100644
index 0000000000..b6edda1cf7
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gstreamer1.0/0002-basesink-Fix-QoS-lateness-checking-if-subclass-imple.patch
@@ -0,0 +1,70 @@
+From 6914566ed6a89c96973a578aa5ecd01ee68cdcfd Mon Sep 17 00:00:00 2001
+From: Jian <Jian.Li@freescale.com>
+Date: Thu, 14 May 2015 15:49:43 +0800
+Subject: [PATCH] basesink: Fix QoS/lateness checking if subclass implements
+ prepare/prepare_list vfuncs
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+In basesink functions gst_base_sink_chain_unlocked(), below code is used to
+checking if buffer is late before doing prepare call to save some effort:
+    if (syncable && do_sync)
+      late =
+          gst_base_sink_is_too_late (basesink, obj, rstart, rstop,
+          GST_CLOCK_EARLY, 0, FALSE);
+
+    if (G_UNLIKELY (late))
+      goto dropped;
+
+But this code has problem, it should calculate jitter based on current media
+clock, rather than just passing 0. I found it will drop all the frames when
+rewind in slow speed, such as -2X.
+
+https://bugzilla.gnome.org/show_bug.cgi?id=749258
+
+Upstream-Status: Backport [1.5.1]
+---
+ libs/gst/base/gstbasesink.c |   26 ++++++++++++++++++++++----
+ 1 file changed, 22 insertions(+), 4 deletions(-)
+
+diff --git a/libs/gst/base/gstbasesink.c b/libs/gst/base/gstbasesink.c
+index a505695..5fb2d6a 100644
+--- a/libs/gst/base/gstbasesink.c
++++ b/libs/gst/base/gstbasesink.c
+@@ -3369,10 +3369,28 @@ gst_base_sink_chain_unlocked (GstBaseSink * basesink, GstPad * pad,
+     if (G_UNLIKELY (stepped))
+       goto dropped;
+ 
+-    if (syncable && do_sync)
+-      late =
+-          gst_base_sink_is_too_late (basesink, obj, rstart, rstop,
+-          GST_CLOCK_EARLY, 0, FALSE);
++    if (syncable && do_sync) {
++      GstClock *clock;
++
++      GST_OBJECT_LOCK (basesink);
++      clock = GST_ELEMENT_CLOCK (basesink);
++      if (clock && GST_STATE (basesink) == GST_STATE_PLAYING) {
++        GstClockTime base_time;
++        GstClockTime stime;
++        GstClockTime now;
++
++        base_time = GST_ELEMENT_CAST (basesink)->base_time;
++        stime = base_time + gst_base_sink_adjust_time (basesink, rstart);
++        now = gst_clock_get_time (clock);
++        GST_OBJECT_UNLOCK (basesink);
++
++        late =
++            gst_base_sink_is_too_late (basesink, obj, rstart, rstop,
++            GST_CLOCK_EARLY, GST_CLOCK_DIFF (stime, now), FALSE);
++      } else {
++        GST_OBJECT_UNLOCK (basesink);
++      }
++    }
+ 
+     if (G_UNLIKELY (late))
+       goto dropped;
+-- 
+1.7.9.5
+