AudioVector used NetEq was based on a shift buffer, which has a high complexity, and the complexity is very much dependent on the capacity of the buffer.
This CL changes the shift buffer to a ring buffer.
Reduction in the CPU usages of NetEq is expected.
BUG=608644
R=henrik.lundin@webrtc.org
Review URL: https://codereview.webrtc.org/1948483002 .
Cr-Commit-Position: refs/heads/master@{#12676}
79553cb66e