pcm: Dynamically-size the mixer buffer at higher audio bitrates.

Basically, existing sizes apply for <= 48KHz audio. Up to 96K,
we double the mix buffer.  up to 192K, we double it again.

Will help reduce the interrupt load and overall latency, keeping it
roughtly constant as a function of time, regardless of bitrate.

(It is acutally a fixed-size buffer, statically-allocated to handle the
 worst-case bitrate the player supports. However, at runtime if we are
 using a lower bitrate we will only use a portion of it in order to keep
 latancies down)

Change-Id: I61ca23180a86502732b0903fe9691c1a8c2aeaea

0 files changed, 0 insertions, 0 deletions