🛠️🐜 Antkeeper superbuild with dependencies included
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224 lines
6.3 KiB
224 lines
6.3 KiB
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2007 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include "ringbuffer.h"
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#include <algorithm>
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#include <climits>
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#include <stdexcept>
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#include "almalloc.h"
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RingBufferPtr RingBuffer::Create(size_t sz, size_t elem_sz, int limit_writes)
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{
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size_t power_of_two{0u};
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if(sz > 0)
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{
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power_of_two = sz;
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power_of_two |= power_of_two>>1;
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power_of_two |= power_of_two>>2;
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power_of_two |= power_of_two>>4;
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power_of_two |= power_of_two>>8;
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power_of_two |= power_of_two>>16;
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#if SIZE_MAX > UINT_MAX
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power_of_two |= power_of_two>>32;
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#endif
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}
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++power_of_two;
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if(power_of_two <= sz || power_of_two > std::numeric_limits<size_t>::max()/elem_sz)
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throw std::overflow_error{"Ring buffer size overflow"};
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const size_t bufbytes{power_of_two * elem_sz};
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RingBufferPtr rb{new(FamCount(bufbytes)) RingBuffer{bufbytes}};
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rb->mWriteSize = limit_writes ? sz : (power_of_two-1);
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rb->mSizeMask = power_of_two - 1;
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rb->mElemSize = elem_sz;
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return rb;
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}
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void RingBuffer::reset() noexcept
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{
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mWritePtr.store(0, std::memory_order_relaxed);
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mReadPtr.store(0, std::memory_order_relaxed);
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std::fill_n(mBuffer.begin(), (mSizeMask+1)*mElemSize, al::byte{});
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}
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size_t RingBuffer::read(void *dest, size_t cnt) noexcept
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{
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const size_t free_cnt{readSpace()};
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if(free_cnt == 0) return 0;
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const size_t to_read{std::min(cnt, free_cnt)};
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size_t read_ptr{mReadPtr.load(std::memory_order_relaxed) & mSizeMask};
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size_t n1, n2;
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const size_t cnt2{read_ptr + to_read};
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if(cnt2 > mSizeMask+1)
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{
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n1 = mSizeMask+1 - read_ptr;
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n2 = cnt2 & mSizeMask;
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}
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else
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{
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n1 = to_read;
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n2 = 0;
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}
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auto outiter = std::copy_n(mBuffer.begin() + read_ptr*mElemSize, n1*mElemSize,
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static_cast<al::byte*>(dest));
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read_ptr += n1;
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if(n2 > 0)
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{
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std::copy_n(mBuffer.begin(), n2*mElemSize, outiter);
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read_ptr += n2;
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}
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mReadPtr.store(read_ptr, std::memory_order_release);
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return to_read;
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}
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size_t RingBuffer::peek(void *dest, size_t cnt) const noexcept
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{
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const size_t free_cnt{readSpace()};
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if(free_cnt == 0) return 0;
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const size_t to_read{std::min(cnt, free_cnt)};
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size_t read_ptr{mReadPtr.load(std::memory_order_relaxed) & mSizeMask};
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size_t n1, n2;
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const size_t cnt2{read_ptr + to_read};
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if(cnt2 > mSizeMask+1)
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{
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n1 = mSizeMask+1 - read_ptr;
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n2 = cnt2 & mSizeMask;
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}
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else
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{
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n1 = to_read;
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n2 = 0;
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}
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auto outiter = std::copy_n(mBuffer.begin() + read_ptr*mElemSize, n1*mElemSize,
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static_cast<al::byte*>(dest));
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if(n2 > 0)
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std::copy_n(mBuffer.begin(), n2*mElemSize, outiter);
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return to_read;
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}
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size_t RingBuffer::write(const void *src, size_t cnt) noexcept
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{
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const size_t free_cnt{writeSpace()};
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if(free_cnt == 0) return 0;
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const size_t to_write{std::min(cnt, free_cnt)};
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size_t write_ptr{mWritePtr.load(std::memory_order_relaxed) & mSizeMask};
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size_t n1, n2;
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const size_t cnt2{write_ptr + to_write};
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if(cnt2 > mSizeMask+1)
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{
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n1 = mSizeMask+1 - write_ptr;
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n2 = cnt2 & mSizeMask;
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}
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else
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{
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n1 = to_write;
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n2 = 0;
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}
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auto srcbytes = static_cast<const al::byte*>(src);
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std::copy_n(srcbytes, n1*mElemSize, mBuffer.begin() + write_ptr*mElemSize);
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write_ptr += n1;
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if(n2 > 0)
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{
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std::copy_n(srcbytes + n1*mElemSize, n2*mElemSize, mBuffer.begin());
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write_ptr += n2;
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}
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mWritePtr.store(write_ptr, std::memory_order_release);
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return to_write;
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}
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auto RingBuffer::getReadVector() const noexcept -> DataPair
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{
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DataPair ret;
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size_t w{mWritePtr.load(std::memory_order_acquire)};
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size_t r{mReadPtr.load(std::memory_order_acquire)};
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w &= mSizeMask;
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r &= mSizeMask;
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const size_t free_cnt{(w-r) & mSizeMask};
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const size_t cnt2{r + free_cnt};
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if(cnt2 > mSizeMask+1)
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{
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/* Two part vector: the rest of the buffer after the current read ptr,
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* plus some from the start of the buffer. */
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ret.first.buf = const_cast<al::byte*>(mBuffer.data() + r*mElemSize);
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ret.first.len = mSizeMask+1 - r;
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ret.second.buf = const_cast<al::byte*>(mBuffer.data());
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ret.second.len = cnt2 & mSizeMask;
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}
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else
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{
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/* Single part vector: just the rest of the buffer */
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ret.first.buf = const_cast<al::byte*>(mBuffer.data() + r*mElemSize);
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ret.first.len = free_cnt;
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ret.second.buf = nullptr;
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ret.second.len = 0;
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}
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return ret;
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}
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auto RingBuffer::getWriteVector() const noexcept -> DataPair
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{
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DataPair ret;
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size_t w{mWritePtr.load(std::memory_order_acquire)};
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size_t r{mReadPtr.load(std::memory_order_acquire) + mWriteSize - mSizeMask};
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w &= mSizeMask;
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r &= mSizeMask;
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const size_t free_cnt{(r-w-1) & mSizeMask};
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const size_t cnt2{w + free_cnt};
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if(cnt2 > mSizeMask+1)
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{
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/* Two part vector: the rest of the buffer after the current write ptr,
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* plus some from the start of the buffer. */
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ret.first.buf = const_cast<al::byte*>(mBuffer.data() + w*mElemSize);
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ret.first.len = mSizeMask+1 - w;
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ret.second.buf = const_cast<al::byte*>(mBuffer.data());
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ret.second.len = cnt2 & mSizeMask;
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}
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else
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{
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ret.first.buf = const_cast<al::byte*>(mBuffer.data() + w*mElemSize);
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ret.first.len = free_cnt;
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ret.second.buf = nullptr;
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ret.second.len = 0;
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}
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return ret;
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}
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