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glememory: only store and act on the map flags on first/last map/unmap

Browse source 
Anytime else, we have no idea how to match up map and unmaps.
We also don't know exactly how the calling code is using us.
Also fixes the case where we're trying to transfer while someone else
is accessing our data pointer or texture resulting in mismatched video
frames.

https://bugzilla.gnome.org/show_bug.cgi?id=744839
This commit is contained in:
Matthew Waters 2015-02-20 18:42:23 +11:00
parent 880dcd8039
commit a4040f2ee9
2 changed files with 9 additions and 4 deletions
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12
gst-libs/gst/gl/gstglmemory.c
View file

@ -859,7 +859,9 @@ _gl_mem_map (GstGLMemory * gl_mem, gsize maxsize, GstMapFlags flags)
data = gl_mem->data;
}
gl_mem->map_flags = flags;
/* only store the first map flags, subsequent maps must be a subset of this */
if (gl_mem->map_count++ == 0)
gl_mem->map_flags = flags;
g_mutex_unlock (&gl_mem->lock);
@ -882,13 +884,15 @@ _gl_mem_unmap (GstGLMemory * gl_mem)
{
g_mutex_lock (&gl_mem->lock);
if (gl_mem->map_flags & GST_MAP_WRITE) {
if (!(gl_mem->map_flags & GST_MAP_GL))
if (gl_mem->map_count <= 1 && gl_mem->map_flags & GST_MAP_WRITE) {
if (!(gl_mem->map_flags & GST_MAP_GL)) {
gst_gl_context_thread_add (gl_mem->context,
(GstGLContextThreadFunc) _transfer_upload, gl_mem);
}
}
gl_mem->map_flags = 0;
if (--gl_mem->map_count <= 0)
gl_mem->map_flags = 0;
g_mutex_unlock (&gl_mem->lock);
}

1
gst-libs/gst/gl/gstglmemory.h
View file

@ -103,6 +103,7 @@ struct _GstGLMemory
guint tex_width;
guint transfer_pbo;
GstMapFlags map_flags;
guint map_count;
GMutex lock;
};