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 
20 #ifdef __ANDROID__
21 #include <audio_utils/primitives.h>
22 #endif
23 
24 #include "AudioProcessorBase.h"
25 #include "SourceI16.h"
26 
27 using namespace flowgraph;
28 
SourceI16(int32_t channelCount)29 SourceI16::SourceI16(int32_t channelCount)
30         : AudioSource(channelCount) {
31 }
32 
onProcess(int64_t framePosition,int32_t numFrames)33 int32_t SourceI16::onProcess(int64_t framePosition, int32_t numFrames) {
34     float *floatData = output.getBlock();
35     int32_t channelCount = output.getSamplesPerFrame();
36 
37     int32_t framesLeft = mSizeInFrames - mFrameIndex;
38     int32_t framesToProcess = std::min(numFrames, framesLeft);
39     int32_t numSamples = framesToProcess * channelCount;
40 
41     const int16_t *shortBase = static_cast<const int16_t *>(mData);
42     const int16_t *shortData = &shortBase[mFrameIndex * channelCount];
43 
44 #ifdef __ANDROID__
45     memcpy_to_float_from_i16(floatData, shortData, numSamples);
46 #else
47     for (int i = 0; i < numSamples; i++) {
48         *floatData++ = *shortData++ * (1.0f / 32768);
49     }
50 #endif
51 
52     mFrameIndex += framesToProcess;
53     return framesToProcess;
54 }