Glenn Kasten | a7a7bb6 | 2017-03-09 14:09:51 -0800 | [diff] [blame] | 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 | |
| 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 | |
| 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 | |
| 54 | audio_utils_fifo_writer32::~audio_utils_fifo_writer32() |
| 55 | { |
| 56 | } |
| 57 | |
| 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 | } |