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a81ad74e3a
This revisits two main aspects of playback from `Sample`: copying frames into a temporary playback buffer before resampling, and advancing the state's frame index. Both operations were improperly done, causing distorted audio to be heard when resampling from within the `Sample::play` function. To fix this, playback into the temporary playback buffer is now done using the `playRaw` function, which copies the frame one by one in a loop, moving through the buffer correctly as determined by the loop mode. In addition, advancement of the playback index is done using the `advance` function, which advances the index by the given amount and handles an out of bounds index for the loop modes as necessary using the modulo operator.
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
/*
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* SampleBuffer.cpp - container-class SampleBuffer
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*
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* Copyright (c) 2005-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU 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 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 GNU
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* 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
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#include "SampleBuffer.h"
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#include <cstring>
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#include "PathUtil.h"
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#include "SampleDecoder.h"
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#include "lmms_basics.h"
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namespace lmms {
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SampleBuffer::SampleBuffer(const sampleFrame* data, size_t numFrames, int sampleRate)
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: m_data(data, data + numFrames)
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, m_sampleRate(sampleRate)
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{
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}
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SampleBuffer::SampleBuffer(const QString& audioFile)
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{
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if (audioFile.isEmpty()) { throw std::runtime_error{"Failure loading audio file: Audio file path is empty."}; }
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const auto absolutePath = PathUtil::toAbsolute(audioFile);
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if (auto decodedResult = SampleDecoder::decode(absolutePath))
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{
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auto& [data, sampleRate] = *decodedResult;
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m_data = std::move(data);
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m_sampleRate = sampleRate;
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m_audioFile = PathUtil::toShortestRelative(audioFile);
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return;
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}
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throw std::runtime_error{
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"Failed to decode audio file: Either the audio codec is unsupported, or the file is corrupted."};
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}
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SampleBuffer::SampleBuffer(const QString& base64, int sampleRate)
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: m_sampleRate(sampleRate)
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{
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// TODO: Replace with non-Qt equivalent
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const auto bytes = QByteArray::fromBase64(base64.toUtf8());
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m_data.resize(bytes.size() / sizeof(sampleFrame));
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std::memcpy(reinterpret_cast<char*>(m_data.data()), bytes, m_data.size() * sizeof(sampleFrame));
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}
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SampleBuffer::SampleBuffer(std::vector<sampleFrame> data, int sampleRate)
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: m_data(std::move(data))
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, m_sampleRate(sampleRate)
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{
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}
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void swap(SampleBuffer& first, SampleBuffer& second) noexcept
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{
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using std::swap;
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swap(first.m_data, second.m_data);
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swap(first.m_audioFile, second.m_audioFile);
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swap(first.m_sampleRate, second.m_sampleRate);
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}
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QString SampleBuffer::toBase64() const
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{
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// TODO: Replace with non-Qt equivalent
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const auto data = reinterpret_cast<const char*>(m_data.data());
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const auto size = static_cast<int>(m_data.size() * sizeof(sampleFrame));
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const auto byteArray = QByteArray{data, size};
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return byteArray.toBase64();
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}
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auto SampleBuffer::emptyBuffer() -> std::shared_ptr<const SampleBuffer>
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{
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static auto s_buffer = std::make_shared<const SampleBuffer>();
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return s_buffer;
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}
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} // namespace lmms
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