The write vector represents the chunks queued for OpenSL, and the write pointer
only increments when OpenSL fills in more samples. So requeueing from the start
of the write vector is requeueing chunks that are already queued, which is
obviously wrong. It instead needs to queue chunks that become available as
they're read.
Because the ring buffer holds more elements than can be written to at a givem
time, the read vector does not represent the next writable chunks to queue.
Advancing the read pointer increases the number of writable elements, so
instead of queueing from the read vector or the start of the write vector,
queue from the end of the write vector given the number of chunks read.
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