1 /*
2 * Copyright 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "common/OboeDebug.h"
18 #include "FullDuplexEcho.h"
19
start()20 oboe::Result FullDuplexEcho::start() {
21 int32_t delayFrames = (int32_t) (kMaxDelayTimeSeconds * getOutputStream()->getSampleRate());
22 mDelayLine = std::make_unique<InterpolatingDelayLine>(delayFrames);
23 // Use peak detector for input streams
24 mNumChannels = getInputStream()->getChannelCount();
25 mPeakDetectors = std::make_unique<PeakDetector[]>(mNumChannels);
26 return FullDuplexStreamWithConversion::start();
27 }
28
getPeakLevel(int index)29 double FullDuplexEcho::getPeakLevel(int index) {
30 if (mPeakDetectors == nullptr) {
31 LOGE("%s() called before setup()", __func__);
32 return -1.0;
33 } else if (index < 0 || index >= mNumChannels) {
34 LOGE("%s(), index out of range, 0 <= %d < %d", __func__, index, mNumChannels.load());
35 return -2.0;
36 }
37 return mPeakDetectors[index].getLevel();
38 }
39
onBothStreamsReadyFloat(const float * inputData,int numInputFrames,float * outputData,int numOutputFrames)40 oboe::DataCallbackResult FullDuplexEcho::onBothStreamsReadyFloat(
41 const float *inputData,
42 int numInputFrames,
43 float *outputData,
44 int numOutputFrames) {
45 int32_t framesToEcho = std::min(numInputFrames, numOutputFrames);
46 auto *inputFloat = const_cast<float *>(inputData);
47 float *outputFloat = outputData;
48 // zero out entire output array
49 memset(outputFloat, 0, static_cast<size_t>(numOutputFrames)
50 * static_cast<size_t>(getOutputStream()->getBytesPerFrame()));
51
52 int32_t inputStride = getInputStream()->getChannelCount();
53 int32_t outputStride = getOutputStream()->getChannelCount();
54 float delayFrames = mDelayTimeSeconds * getOutputStream()->getSampleRate();
55 while (framesToEcho-- > 0) {
56 *outputFloat = mDelayLine->process(delayFrames, *inputFloat); // mono delay
57
58 for (int iChannel = 0; iChannel < inputStride; iChannel++) {
59 float sample = * (inputFloat + iChannel);
60 mPeakDetectors[iChannel].process(sample);
61 }
62
63 inputFloat += inputStride;
64 outputFloat += outputStride;
65 }
66 return oboe::DataCallbackResult::Continue;
67 };
68