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75 lines
2.4 KiB
75 lines
2.4 KiB
/* |
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* Copyright (C) 2017 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include <atomic> |
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#include <stdlib.h> |
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#include <string.h> |
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// TODO templatize int32_t |
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#include <audio_utils/fifo_writer32.h> |
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static inline void memcpyWords(int32_t *dst, const int32_t *src, uint32_t count) |
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{ |
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switch (count) { |
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case 0: break; |
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// TODO templatize here also, but first confirm no performance regression compared to current |
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#define _(n) \ |
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case n: { \ |
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struct s##n { int32_t a[n]; }; \ |
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*(struct s##n *)dst = *(const struct s##n *)src; \ |
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break; \ |
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} |
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_(1) _(2) _(3) _(4) _(5) _(6) _(7) _(8) _(9) _(10) _(11) _(12) _(13) _(14) _(15) _(16) |
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#undef _ |
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default: |
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memcpy(dst, src, count * sizeof(int32_t)); |
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break; |
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} |
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} |
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audio_utils_fifo_writer32::audio_utils_fifo_writer32(audio_utils_fifo& fifo) : |
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mLocalRear(0), mFrameCountP2(fifo.mFrameCountP2), mBuffer((int32_t *) fifo.mBuffer), |
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mWriterRear(fifo.mWriterRear) |
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{ |
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if (fifo.mFrameSize != sizeof(int32_t) || fifo.mFudgeFactor != 0 || |
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((size_t) mBuffer & ((sizeof(int32_t) - 1))) != 0) { |
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abort(); |
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} |
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} |
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audio_utils_fifo_writer32::~audio_utils_fifo_writer32() |
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{ |
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} |
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void audio_utils_fifo_writer32::write(const int32_t *buffer, uint32_t count) |
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__attribute__((no_sanitize("integer"))) // mLocalRear += can wrap |
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{ |
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uint32_t availToWrite = mFrameCountP2; |
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if (availToWrite > count) { |
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availToWrite = count; |
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} |
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uint32_t rearOffset = mLocalRear & (mFrameCountP2 - 1); |
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uint32_t part1 = mFrameCountP2 - rearOffset; |
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if (part1 > availToWrite) { |
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part1 = availToWrite; |
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} |
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memcpyWords(&mBuffer[rearOffset], buffer, part1); |
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// TODO apply this simplification to other copies of the code |
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uint32_t part2 = availToWrite - part1; |
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memcpyWords(&mBuffer[0], &buffer[part1], part2); |
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mLocalRear += availToWrite; |
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}
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