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ff5494046a
Special case check for sub-buffers: In certain cases, places like GstBaseTransform, which might check that the buffer is writable before copying metadata, timestamp, and such, will find that the buffer has more than one reference to it. In these cases, they will create a sub-buffer with an offset=0 and length equal to the original buffer size. This could happen in two scenarios: (1) a tee in the pipeline, and (2) because the refcnt is incremented in gst_mini_object_free() before the finalize function is called, and decremented after it returns.. but returning this buffer to the buffer pool in the finalize function, could wake up a thread blocked in _buffer_alloc() which could run and get a buffer w/ refcnt==2 before the thread originally unref'ing the buffer returns from finalize function and decrements the refcnt back to 1! This is related to issue #545501 |
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