If the input file name matches the "<name>-<params>.wav" pattern and <name> is a valid signal creator name, then <params> is parsed and used to create a new signal which is written in place of the missing file.
This CL only adds a pure tone creator. For instance, 'pure_tone-440_1000.wav' creates a pure tone at 440 Hz, 1000 ms long, mono, sampled at 48kHz.
This feature can be used to simplify the creation of common probe signals - no need to add external .wav files. Also, it will be exploited by a coming CL that adds a new evaluation score requiring the input signal to be a pure tone.
Additional minor fixes:
- apm_quality_assessment_unittest.py: command line arguments replaced to avoid that those for the unit test framework are passed
- simulation_unittest.py: invalid evaluation score name replaced
BUG=webrtc:7218
Review-Url: https://codereview.webrtc.org/2989823002
Cr-Commit-Position: refs/heads/master@{#19200}
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