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 "Player.h"
18 #include "utils/logging.h"
19
renderAudio(float * targetData,int32_t numFrames)20 void Player::renderAudio(float *targetData, int32_t numFrames){
21
22 const AudioProperties properties = mSource->getProperties();
23
24 if (mIsPlaying){
25
26 int64_t framesToRenderFromData = numFrames;
27 int64_t totalSourceFrames = mSource->getSize() / properties.channelCount;
28 const float *data = mSource->getData();
29
30 // Check whether we're about to reach the end of the recording
31 if (!mIsLooping && mReadFrameIndex + numFrames >= totalSourceFrames){
32 framesToRenderFromData = totalSourceFrames - mReadFrameIndex;
33 mIsPlaying = false;
34 }
35
36 for (int i = 0; i < framesToRenderFromData; ++i) {
37 for (int j = 0; j < properties.channelCount; ++j) {
38 targetData[(i*properties.channelCount)+j] = data[(mReadFrameIndex*properties.channelCount)+j];
39 }
40
41 // Increment and handle wraparound
42 if (++mReadFrameIndex >= totalSourceFrames) mReadFrameIndex = 0;
43 }
44
45 if (framesToRenderFromData < numFrames){
46 // fill the rest of the buffer with silence
47 renderSilence(&targetData[framesToRenderFromData], numFrames * properties.channelCount);
48 }
49
50 } else {
51 renderSilence(targetData, numFrames * properties.channelCount);
52 }
53 }
54
renderSilence(float * start,int32_t numSamples)55 void Player::renderSilence(float *start, int32_t numSamples){
56 for (int i = 0; i < numSamples; ++i) {
57 start[i] = 0;
58 }
59 }
60