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v4l2bufferpool: Improve buffer validation

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Improve buffer validation by making sure each memory are the right
one and that each memory is writable. This fixes tearing issues in
case downstream uses gst_buffer_make_writable() or other type
of GstBuffer copy where memory are only reffed.

https://bugzilla.gnome.org/show_bug.cgi?id=739754
This commit is contained in:
Nicolas Dufresne 2014-11-06 21:21:40 -05:00
parent 038cc7b004
commit 3282df51a4
1 changed files with 17 additions and 3 deletions
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20
sys/v4l2/gstv4l2bufferpool.c
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@ -70,7 +70,7 @@ static void gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool,
GstBuffer * buffer); GstBuffer * buffer);
static gboolean static gboolean
gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** group) gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** out_group)
{ {
GstMemory *mem = gst_buffer_peek_memory (buffer, 0); GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
gboolean valid = FALSE; gboolean valid = FALSE;
@ -84,9 +84,23 @@ gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** group)
if (mem && gst_is_v4l2_memory (mem)) { if (mem && gst_is_v4l2_memory (mem)) {
GstV4l2Memory *vmem = (GstV4l2Memory *) mem; GstV4l2Memory *vmem = (GstV4l2Memory *) mem;
GstV4l2MemoryGroup *group = vmem->group;
gint i;
if (group->n_mem != gst_buffer_n_memory (buffer))
goto done;
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] != gst_buffer_peek_memory (buffer, i))
goto done;
if (!gst_memory_is_writable (group->mem[i]))
goto done;
}
valid = TRUE; valid = TRUE;
if (group) if (out_group)
*group = vmem->group; *out_group = group;
} }
done: done: