131 lines
2.9 KiB
C++
131 lines
2.9 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "PeakBuffer.hxx"
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#include "DynamicFifoBuffer.hxx"
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#include <algorithm>
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#include <cassert>
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PeakBuffer::~PeakBuffer() noexcept
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{
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delete normal_buffer;
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delete peak_buffer;
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}
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bool
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PeakBuffer::empty() const noexcept
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{
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return (normal_buffer == nullptr || normal_buffer->empty()) &&
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(peak_buffer == nullptr || peak_buffer->empty());
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}
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std::span<std::byte>
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PeakBuffer::Read() const noexcept
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{
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if (normal_buffer != nullptr) {
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const auto p = normal_buffer->Read();
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if (!p.empty())
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return p;
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}
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if (peak_buffer != nullptr) {
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const auto p = peak_buffer->Read();
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if (!p.empty())
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return p;
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}
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return {};
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}
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void
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PeakBuffer::Consume(std::size_t length) noexcept
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{
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if (normal_buffer != nullptr && !normal_buffer->empty()) {
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normal_buffer->Consume(length);
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return;
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}
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if (peak_buffer != nullptr && !peak_buffer->empty()) {
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peak_buffer->Consume(length);
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if (peak_buffer->empty()) {
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delete peak_buffer;
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peak_buffer = nullptr;
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}
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return;
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}
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}
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static std::size_t
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AppendTo(DynamicFifoBuffer<std::byte> &buffer,
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std::span<const std::byte> src) noexcept
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{
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assert(!src.empty());
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std::size_t total = 0;
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do {
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const auto p = buffer.Write();
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if (p.empty())
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break;
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const std::size_t nbytes = std::min(src.size(), p.size());
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std::copy_n(src.begin(), nbytes, p.begin());
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buffer.Append(nbytes);
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src = src.subspan(nbytes);
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total += nbytes;
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} while (!src.empty());
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return total;
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}
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bool
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PeakBuffer::Append(std::span<const std::byte> src)
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{
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if (src.empty())
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return true;
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if (peak_buffer != nullptr && !peak_buffer->empty()) {
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std::size_t nbytes = AppendTo(*peak_buffer, src);
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return nbytes == src.size();
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}
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if (normal_buffer == nullptr)
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normal_buffer = new DynamicFifoBuffer<std::byte>(normal_size);
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std::size_t nbytes = AppendTo(*normal_buffer, src);
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if (nbytes > 0) {
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src = src.subspan(nbytes);
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if (src.empty())
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return true;
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}
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if (peak_buffer == nullptr) {
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if (peak_size > 0)
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peak_buffer = new DynamicFifoBuffer<std::byte>(peak_size);
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if (peak_buffer == nullptr)
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return false;
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}
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nbytes = AppendTo(*peak_buffer, src);
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return nbytes == src.size();
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}
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