blob: 3220df226b742b5ff6d4dee1607f6506ece08840 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
* Copyright 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <unistd.h>
#include "common/OboeDebug.h"
#include "oboe/Definitions.h"
#include "SawPingGenerator.h"
using namespace oboe::flowgraph;
SawPingGenerator::SawPingGenerator()
: OscillatorBase()
, mRequestCount(0)
, mAcknowledgeCount(0)
, mLevel(0.0f) {
}
SawPingGenerator::~SawPingGenerator() { }
void SawPingGenerator::reset() {
FlowGraphNode::reset();
mAcknowledgeCount.store(mRequestCount.load());
}
int32_t SawPingGenerator::onProcess(int numFrames) {
const float *frequencies = frequency.getBuffer();
const float *amplitudes = amplitude.getBuffer();
float *buffer = output.getBuffer();
if (mRequestCount.load() > mAcknowledgeCount.load()) {
mPhase = -1.0f;
mLevel = 1.0;
mAcknowledgeCount++;
}
// Check level to prevent numeric underflow.
if (mLevel > 0.000001) {
for (int i = 0; i < numFrames; i++) {
float sawtooth = incrementPhase(frequencies[i]);
*buffer++ = (float) (sawtooth * mLevel * amplitudes[i]);
mLevel *= 0.999;
}
} else {
for (int i = 0; i < numFrames; i++) {
*buffer++ = 0.0f;
}
}
return numFrames;
}
void SawPingGenerator::trigger() {
mRequestCount++;
}
|
