The renderers are currently constructing formats that consist of their
input format with added PCM encoding. Such formats are not self-consistent,
and this only works because DefaultAudioSink ignores the rest of the
format if the format has a PCM encoding. It would not work if the sink
implementation checked the MIME type, for example, which wouldn't be a
strange or incorrect thing for it to do.
The more correct approach is to construct a new format that properly
represents the PCM that will be provided to the sink.
This change also renames supportsOutput to supportsFormat, because
AudioSink itself has both an input and an output side, and this method
is actually evaluating support on the input side of the sink.
PiperOrigin-RevId: 320396089
e8596428c0