gl/filter: fixup passthrough bufferpool
In a pipeline like so: videotestsrc ! gleffects ! videoconvert ! sink gleffects was simply passing the videoconvert bufferpool to videotestsrc and not creating a glbufferpool. videobufferpool would then fail to allocate from the glallocator.
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@ -840,7 +840,8 @@ gst_gl_filter_propose_allocation (GstBaseTransform * trans,
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gst_query_parse_allocation (decide_query, &decide_caps, NULL);
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decide_pool = gst_base_transform_get_buffer_pool (trans);
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if (gst_caps_is_equal_fixed (decide_caps, caps)) {
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if (GST_IS_GL_BUFFER_POOL (decide_pool)
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&& gst_caps_is_equal_fixed (decide_caps, caps)) {
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pool = decide_pool;
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} else {
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GST_DEBUG_OBJECT (filter, "create new pool");
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