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author | Chia-chi Yeh <chiachi@android.com> | 2010-10-05 01:17:13 +0800 |
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committer | Chia-chi Yeh <chiachi@android.com> | 2010-10-05 02:47:00 +0800 |
commit | a8a10096a1501e901676632d78f699cdebe9f4f6 (patch) | |
tree | e55bd543267cc61ebd84d41ab6b880c964fcf197 /voip/jni/rtp/EchoSuppressor.h | |
parent | 624380a14def6c2acdb473e09c36139acbcefbf9 (diff) | |
download | frameworks_base-a8a10096a1501e901676632d78f699cdebe9f4f6.zip frameworks_base-a8a10096a1501e901676632d78f699cdebe9f4f6.tar.gz frameworks_base-a8a10096a1501e901676632d78f699cdebe9f4f6.tar.bz2 |
RTP: Add a baseline echo suppressor.
Change-Id: I832f1f572f141fd928afe671b12d0b59f2a8e0b1
Diffstat (limited to 'voip/jni/rtp/EchoSuppressor.h')
-rw-r--r-- | voip/jni/rtp/EchoSuppressor.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/voip/jni/rtp/EchoSuppressor.h b/voip/jni/rtp/EchoSuppressor.h new file mode 100644 index 0000000..85decf5 --- /dev/null +++ b/voip/jni/rtp/EchoSuppressor.h @@ -0,0 +1,51 @@ +/* + * Copyrightm (C) 2010 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef __ECHO_SUPPRESSOR_H__ +#define __ECHO_SUPPRESSOR_H__ + +#include <stdint.h> + +class EchoSuppressor +{ +public: + // The sampleCount must be power of 2. + EchoSuppressor(int sampleRate, int sampleCount, int tailLength); + ~EchoSuppressor(); + void run(int16_t *playbacked, int16_t *recorded); + +private: + int mScale; + int mSampleCount; + int mWindowSize; + int mTailLength; + int mRecordLength; + int mRecordOffset; + + float *mXs; + float *mXYs; + float *mXXs; + float mYY; + + float *mXYRecords; + float *mXXRecords; + float *mYYRecords; + + float mLastX; + float mLastY; +}; + +#endif |