Get a subbuffer of size bytes from the given pad data.
This function should be called with pads STREAM_LOCK held, such as in the callback.
MT safe.
the data to use
the number of bytes to read
A sub buffer. The size of the buffer can be less that requested. A return of NULL signals that the pad is end-of-stream. Unref the buffer after use.
Get a subbuffer of size bytes from the given pad data.
This function should be called with pads STREAM_LOCK held, such as in the callback.
MT safe.