Time scaling tests

# What does it do?

These tests run a speech file through the time scaling routines.

# How are the tests run?

These tests process a speech file called pre_time_scale.wav. This file should contain 8000 sample/second 16 bits/sample linear audio. The tests read this file, change the time scale of its contents, and write the resulting audio to post_time_scale.wav. This file also contains 8000 sample/second 16 bits/sample linear audio.