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 <stdint.h>
19
20 #ifdef __ANDROID__
21 #include <audio_utils/primitives.h>
22 #endif
23
24 #include "AudioProcessorBase.h"
25 #include "SinkI24.h"
26
27 using namespace flowgraph;
28
SinkI24(int32_t channelCount)29 SinkI24::SinkI24(int32_t channelCount)
30 : AudioSink(channelCount) {}
31
read(void * data,int32_t numFrames)32 int32_t SinkI24::read(void *data, int32_t numFrames) {
33 uint8_t *byteData = (uint8_t *) data;
34 const int32_t channelCount = input.getSamplesPerFrame();
35
36 int32_t framesLeft = numFrames;
37 while (framesLeft > 0) {
38 // Run the graph and pull data through the input port.
39 int32_t framesRead = pull(framesLeft);
40 if (framesRead <= 0) {
41 break;
42 }
43 const float *floatData = input.getBlock();
44 int32_t numSamples = framesRead * channelCount;
45 #ifdef __ANDROID__
46 memcpy_to_p24_from_float(byteData, floatData, numSamples);
47 static const int kBytesPerI24Packed = 3;
48 byteData += numSamples * kBytesPerI24Packed;
49 floatData += numSamples;
50 #else
51 const int32_t kI24PackedMax = 0x007FFFFF;
52 const int32_t kI24PackedMin = 0xFF800000;
53 for (int i = 0; i < numSamples; i++) {
54 int32_t n = (int32_t) (*floatData++ * 0x00800000);
55 n = std::min(kI24PackedMax, std::max(kI24PackedMin, n)); // clip
56 // Write as a packed 24-bit integer in Little Endian format.
57 *byteData++ = (uint8_t) n;
58 *byteData++ = (uint8_t) (n >> 8);
59 *byteData++ = (uint8_t) (n >> 16);
60 }
61 #endif
62 framesLeft -= framesRead;
63 }
64 return numFrames - framesLeft;
65 }
66