1 /*
2 * Copyright (C) 2017 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 <atomic>
18 #include <stdlib.h>
19 #include <string.h>
20
21 // TODO templatize int32_t
22
23 #include <audio_utils/fifo_writer32.h>
24
memcpyWords(int32_t * dst,const int32_t * src,uint32_t count)25 static inline void memcpyWords(int32_t *dst, const int32_t *src, uint32_t count)
26 {
27 switch (count) {
28 case 0: break;
29 // TODO templatize here also, but first confirm no performance regression compared to current
30 #define _(n) \
31 case n: { \
32 struct s##n { int32_t a[n]; }; \
33 *(struct s##n *)dst = *(const struct s##n *)src; \
34 break; \
35 }
36 _(1) _(2) _(3) _(4) _(5) _(6) _(7) _(8) _(9) _(10) _(11) _(12) _(13) _(14) _(15) _(16)
37 #undef _
38 default:
39 memcpy(dst, src, count * sizeof(int32_t));
40 break;
41 }
42 }
43
audio_utils_fifo_writer32(audio_utils_fifo & fifo)44 audio_utils_fifo_writer32::audio_utils_fifo_writer32(audio_utils_fifo& fifo) :
45 mLocalRear(0), mFrameCountP2(fifo.mFrameCountP2), mBuffer((int32_t *) fifo.mBuffer),
46 mWriterRear(fifo.mWriterRear)
47 {
48 if (fifo.mFrameSize != sizeof(int32_t) || fifo.mFudgeFactor != 0 ||
49 ((size_t) mBuffer & ((sizeof(int32_t) - 1))) != 0) {
50 abort();
51 }
52 }
53
~audio_utils_fifo_writer32()54 audio_utils_fifo_writer32::~audio_utils_fifo_writer32()
55 {
56 }
57
write(const int32_t * buffer,uint32_t count)58 void audio_utils_fifo_writer32::write(const int32_t *buffer, uint32_t count)
59 __attribute__((no_sanitize("integer"))) // mLocalRear += can wrap
60 {
61 uint32_t availToWrite = mFrameCountP2;
62 if (availToWrite > count) {
63 availToWrite = count;
64 }
65 uint32_t rearOffset = mLocalRear & (mFrameCountP2 - 1);
66 uint32_t part1 = mFrameCountP2 - rearOffset;
67 if (part1 > availToWrite) {
68 part1 = availToWrite;
69 }
70 memcpyWords(&mBuffer[rearOffset], buffer, part1);
71 // TODO apply this simplification to other copies of the code
72 uint32_t part2 = availToWrite - part1;
73 memcpyWords(&mBuffer[0], &buffer[part1], part2);
74 mLocalRear += availToWrite;
75 }
76