Created attachment 251735 [details] [review]
Fix for orphaned UVC driver allocated buffers in v4l2src...

So, I was able to "fix" an issue with v4l2src UVC driver allocated buffers being replaced (orphaned) by the GstBuffer API (gst_buffer_resize() for example) with the patch below which "puts back" the UVC driver allocated buffers to the GstBuffers in which they were initially placed when allocated and wrapped in a GstMemory object.

diff -rupN gst-plugins-good-1.1.3/sys/v4l2/gstv4l2bufferpool.c gst-plugins-good-1.1.3.new/sys/v4l2/gstv4l2bufferpool.c
--- gst-plugins-good-1.1.3/sys/v4l2/gstv4l2bufferpool.c	2013-07-08 10:27:16.000000000 -0400
+++ gst-plugins-good-1.1.3.new/sys/v4l2/gstv4l2bufferpool.c	2013-08-14 17:21:42.801320440 -0400
@@ -678,6 +678,12 @@ gst_v4l2_buffer_pool_qbuf (GstV4l2Buffer
   if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
     goto queue_failed;
 
+  /* Memory may have been replaced in GstBuffer so put it back using meta cookie */
+  gst_buffer_replace_memory (buf, 0,
+    gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
+        meta->mem, meta->vbuffer.length, 0, meta->vbuffer.length, NULL,
+        NULL));
+
   pool->buffers[index] = buf;
   pool->num_queued++;