1 /*
2  * Copyright 2018 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 <algorithm>
18 #include <unistd.h>
19 #include "AudioProcessorBase.h"
20 #include "SourceFloat.h"
21 
22 using namespace flowgraph;
23 
SourceFloat(int32_t channelCount)24 SourceFloat::SourceFloat(int32_t channelCount)
25         : AudioSource(channelCount) {
26 }
27 
onProcess(int64_t framePosition,int32_t numFrames)28 int32_t SourceFloat::onProcess(int64_t framePosition, int32_t numFrames) {
29 
30     float *outputBuffer = output.getBlock();
31     int32_t channelCount = output.getSamplesPerFrame();
32 
33     int32_t framesLeft = mSizeInFrames - mFrameIndex;
34     int32_t framesToProcess = std::min(numFrames, framesLeft);
35     int32_t numSamples = framesToProcess * channelCount;
36 
37     const float *floatBase = (float *) mData;
38     const float *floatData = &floatBase[mFrameIndex * channelCount];
39     memcpy(outputBuffer, floatData, numSamples * sizeof(float));
40     mFrameIndex += framesToProcess;
41     return framesToProcess;
42 }
43 
44