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Add a README to e2e_quality.

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TBR=kjellander@webrtc.org
BUG=issue502
TEST=none

Review URL: https://webrtc-codereview.appspot.com/590004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2278 4adac7df-926f-26a2-2b94-8c16560cd09d
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andrew@webrtc.org
2012-05-23 15:11:20 +00:00
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The tools here run an end-to-end audio quality test on Linux using PulseAudio.
INSTALLATION
The test depends on PulseAudio virtual devices (null sinks). Without additional
arguments, run_audio_test.py expects a pair of sinks named "capture" and
"render". To create these devices at machine startup, place the provided
default.pa file in ~/.pulse. Alternately, the "pacmd" commands therein can be
run on the command-line to create the devices.
Build all WebRTC targets as usual (or just the audio_e2e_harness target) to
generate the VoiceEngine harness.
USAGE
Run run_audio_test.py to start. The script has reasonable defaults and will
use the expected location of audio_e2e_harness. Some settings will usually
be provided by the user, particularly the comparison tool command-line and
regular expression to extract the quality metric.
An example command-line, run from trunk/
tools/e2e_quality/audio/run_audio_test.py \
--input=data/voice_engine/audio_short16.pcm --output=e2e_audio_out.pcm \
--codec=L16 --compare="comparison-tool" --regexp="(\d\.\d{3})"