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01-Dec-2016 |
Cheng-Yi Chiang <cychiang@chromium.org> |
CRAS: ramp - Add a module for ramping
Add cras_ramp module to handle ramping of data.
1. When device goes from mute to unmute, ramp the data from last
scaler to 1. If there is no last scaler, start from 0.
2. When device goes from unmute to mute, ramp the data from last
scaler to 0. If there is no last scaler, start from 1.
For case 1, device will have smooth transition from mute to unmute.
For case 2, ramp can not finish its full duration. This is because device
samples are muted in cras_iodev_put_output_buffer. Also, device output
switch is turned off right away. These need to be changed in the future
so we can have smooth transition from unmute to mute.
BUG=chromium:669662
TEST=make check
Change-Id: I25173becd826053c4fa0b0a3bf9ff0d611352d15
Reviewed-on: https://chromium-review.googlesource.com/415750
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
/external/adhd/cras/src/server/cras_ramp.h
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