1 /*
2 * Copyright 2015 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
18 #include <unistd.h>
19 #include "AudioProcessorBase.h"
20 #include "MonoToMultiConverter.h"
21
22 using namespace flowgraph;
23
MonoToMultiConverter(int32_t channelCount)24 MonoToMultiConverter::MonoToMultiConverter(int32_t channelCount)
25 : input(*this, 1)
26 , output(*this, channelCount) {
27 }
28
~MonoToMultiConverter()29 MonoToMultiConverter::~MonoToMultiConverter() { }
30
onProcess(int64_t framePosition,int32_t numFrames)31 int32_t MonoToMultiConverter::onProcess(int64_t framePosition, int32_t numFrames) {
32 int32_t framesToProcess = input.pullData(framePosition, numFrames);
33
34 const float *inputBuffer = input.getBlock();
35 float *outputBuffer = output.getBlock();
36 int32_t channelCount = output.getSamplesPerFrame();
37 // TODO maybe move to audio_util as audio_mono_to_multi()
38 for (int i = 0; i < framesToProcess; i++) {
39 // read one, write many
40 float sample = *inputBuffer++;
41 for (int channel = 0; channel < channelCount; channel++) {
42 *outputBuffer++ = sample;
43 }
44 }
45 return framesToProcess;
46 }
47
48