/*
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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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