gstreamer1.0-plugins-base: Fix output buffer can't writable after frame_map() issue

-Add GST_VIDEO_FRAME_MAP_FLAG_NO_REF
 This makes sure that the buffer is not reffed another time when
 storing it in the GstVideoFrame, keeping it writable if it was writable.

-Use new GST_VIDEO_FRAME_MAP_FLAG_NO_REF to replace the old one because it's kind of ugly.

-Don't ref buffers twice when mapping

(From OE-Core master rev: a618f60675dbcc6568d6b9bdee015456cef78a77)

(From OE-Core rev: b75f09af7c4bfa023299c4f82bd6c3f781b93354)

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, 87 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-base/0002-video-frame-Add-GST_VIDEO_FRAME_MAP_FLAG_NO_REF.patch b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-base/0002-video-frame-Add-GST_VIDEO_FRAME_MAP_FLAG_NO_REF.patch
new file mode 100644
index 0000000000..c465b5ceed
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-base/0002-video-frame-Add-GST_VIDEO_FRAME_MAP_FLAG_NO_REF.patch
@@ -0,0 +1,87 @@
+From 40a293d44d1aeccf5eb8e86f23a0b13666111c5c Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
+Date: Fri, 12 Sep 2014 14:39:16 +0300
+Subject: [PATCH 2/3] video-frame: Add GST_VIDEO_FRAME_MAP_FLAG_NO_REF
+
+This makes sure that the buffer is not reffed another time when
+storing it in the GstVideoFrame, keeping it writable if it was
+writable.
+
+Upstream-Status: Backport [1.5.1]
+https://bugzilla.gnome.org/show_bug.cgi?id=736118
+---
+ gst-libs/gst/video/video-frame.c |    9 ++++++++-
+ gst-libs/gst/video/video-frame.h |   18 ++++++++++++++++++
+ 2 files changed, 26 insertions(+), 1 deletion(-)
+
+diff --git a/gst-libs/gst/video/video-frame.c b/gst-libs/gst/video/video-frame.c
+index 537cf70..01f23c0 100644
+--- a/gst-libs/gst/video/video-frame.c
++++ b/gst-libs/gst/video/video-frame.c
+@@ -106,6 +106,9 @@ gst_video_frame_map_id (GstVideoFrame * frame, GstVideoInfo * info,
+     }
+   }
+   frame->buffer = gst_buffer_ref (buffer);
++  if ((flags & GST_VIDEO_FRAME_MAP_FLAG_NO_REF) == 0)
++    gst_buffer_ref (frame->buffer);
++
+   frame->meta = meta;
+ 
+   /* buffer flags enhance the frame flags */
+@@ -189,11 +192,13 @@ gst_video_frame_unmap (GstVideoFrame * frame)
+   GstBuffer *buffer;
+   GstVideoMeta *meta;
+   gint i;
++  GstMapFlags flags;
+ 
+   g_return_if_fail (frame != NULL);
+ 
+   buffer = frame->buffer;
+   meta = frame->meta;
++  flags = frame->map[0].flags;
+ 
+   if (meta) {
+     for (i = 0; i < frame->info.finfo->n_planes; i++) {
+@@ -202,7 +207,9 @@ gst_video_frame_unmap (GstVideoFrame * frame)
+   } else {
+     gst_buffer_unmap (buffer, &frame->map[0]);
+   }
+-  gst_buffer_unref (buffer);
++
++  if ((flags & GST_VIDEO_FRAME_MAP_FLAG_NO_REF) == 0)
++    gst_buffer_unref (frame->buffer);
+ }
+ 
+ /**
+diff --git a/gst-libs/gst/video/video-frame.h b/gst-libs/gst/video/video-frame.h
+index 627fab0..f8e6304 100644
+--- a/gst-libs/gst/video/video-frame.h
++++ b/gst-libs/gst/video/video-frame.h
+@@ -149,6 +149,24 @@ typedef enum {
+   GST_VIDEO_BUFFER_FLAG_LAST        = (GST_BUFFER_FLAG_LAST << 8)
+ } GstVideoBufferFlags;
+ 
++/**
++ * GstVideoBufferFlags:
++ * @GST_VIDEO_FRAME_MAP_FLAG_NO_REF:  Don't take another reference of the buffer and store it in
++ *                                    the GstVideoFrame. This makes sure that the buffer stays
++ *                                    writable while the frame is mapped, but requires that the
++ *                                    buffer reference stays valid until the frame is unmapped again.
++ * @GST_VIDEO_FRAME_MAP_FLAG_LAST:    Offset to define more flags
++ *
++ * Additional mapping flags for gst_video_frame_map().
++ *
++ * Since: 1.6
++ */
++typedef enum {
++  GST_VIDEO_FRAME_MAP_FLAG_NO_REF   = (GST_MAP_FLAG_LAST << 0),
++  GST_VIDEO_FRAME_MAP_FLAG_LAST     = (GST_MAP_FLAG_LAST << 8)
++  /* 8 more flags possible afterwards */
++} GstVideoFrameMapFlags;
++
+ G_END_DECLS
+ 
+ #endif /* __GST_VIDEO_FRAME_H__ */
+-- 
+1.7.9.5
+