We currently only log the input buffers to the codec, but the test
will be more complete and provide more insights into the playback
behavior if we also dump more information about these input buffers
(timestamps and flags) and also all output buffers with their
timestamps and whether they are rendererd (only relevant for video).
And also use the CapturingAudioSink to output the audio data we produce.
PiperOrigin-RevId: 546898937
`DefaultAudioSink` already has 3 telescoping
constructors and an other one would be have been
needed to add a buffer size tuning option.
PiperOrigin-RevId: 414703366
