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| author | Judy Hsiao <judyhsiao@google.com> | 2019-10-02 11:28:29 +0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-10-07 04:50:41 +0000 |
| commit | 5b227937c8a596395cc92bd6790ab53f8cb4f5e4 (patch) | |
| tree | 0d6bd8fe613d38e36af33fe88946932614719edd | |
| parent | 68b2fd9163e433f87b481dbeb983bd83910e4563 (diff) | |
| download | adhd-5b227937c8a596395cc92bd6790ab53f8cb4f5e4.tar.gz | |
CRAS: Initialize x_prev in dcblock_process
Set correct inital value of x_prev to remove the DC \
and slope in the beginning of the recorded waveform
BUG=b:133722255
TEST=1. Make sure DC filter is applied \
2. powerd_dbus_suspend \
3. arecord -f dat -d 10 /tmp/test-cras.wav \
4. The peak in the beginning of the recorded waveform \
should be removed
Change-Id: Ic268999141ae9c291ec2984304f1242b6e0a91ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/1832956
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Judy Hsiao <judyhsiao@chromium.org>
Commit-Queue: Judy Hsiao <judyhsiao@chromium.org>
| -rw-r--r-- | cras/src/dsp/dcblock.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/cras/src/dsp/dcblock.c b/cras/src/dsp/dcblock.c index c6b90c14..53ba9412 100644 --- a/cras/src/dsp/dcblock.c +++ b/cras/src/dsp/dcblock.c @@ -14,6 +14,7 @@ struct dcblock { float y_prev; float ramp_factor; float ramp_increment; + int initialized; }; struct dcblock *dcblock_new(float R, unsigned long sample_rate) @@ -37,6 +38,11 @@ void dcblock_process(struct dcblock *dcblock, float *data, int count) float y_prev = dcblock->y_prev; float R = dcblock->R; + if (!dcblock->initialized) { + x_prev = data[0]; + dcblock->initialized = 1; + } + for (n = 0; n < count; n++) { float x = data[n]; float d = x - x_prev + R * y_prev; |