TestBufferedStreamer_BasicStream flaked under -race (got 1256/1512 vs
1000 expected). The streamer injects silence frames by design when its
ring buffer momentarily underruns; under the race detector the consumer
outran read-ahead and received mid-stream 256-sample silence frames. The
collection loop only skipped leading silence, so those frames were
counted as data.
Skip all zero frames, matching the test's own drain loop — real samples
always start at 1.0, so any zero is injected silence, never source data.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
When seeking, the underlying decoder position was updated but the
BufferedStreamer's ring buffer still contained up to 2 seconds of
pre-seek audio data. The speaker would drain this stale buffer
before playing audio from the new position, causing an audible
delay where the old position's audio continued playing.
Add a Flush() method to BufferedStreamer that resets the ring buffer
pointers, and call it in seekLocked() immediately after a successful
seek. This ensures the speaker starts playing from the seeked
position without any stale audio artifact.