mirror of https://github.com/odrling/Aegisub
114 lines
4.0 KiB
C++
114 lines
4.0 KiB
C++
// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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/// @file audio_provider_ram.cpp
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/// @brief Caching audio provider using heap memory for backing
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/// @ingroup audio_input
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///
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#include "include/aegisub/audio_provider.h"
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#include "audio_controller.h"
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#include <libaegisub/make_unique.h>
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#include <array>
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#include <boost/container/stable_vector.hpp>
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#include <thread>
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namespace {
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#define CacheBits 22
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#define CacheBlockSize (1 << CacheBits)
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class RAMAudioProvider final : public AudioProviderWrapper {
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#ifdef _MSC_VER
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boost::container::stable_vector<char[CacheBlockSize]> blockcache;
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#else
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boost::container::stable_vector<std::array<char, CacheBlockSize>> blockcache;
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#endif
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std::atomic<bool> cancelled = {false};
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std::thread decoder;
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void FillBuffer(void *buf, int64_t start, int64_t count) const override;
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public:
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RAMAudioProvider(std::unique_ptr<AudioProvider> src)
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: AudioProviderWrapper(std::move(src))
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{
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decoded_samples = 0;
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try {
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blockcache.resize((source->GetNumSamples() * source->GetBytesPerSample() + CacheBlockSize - 1) >> CacheBits);
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}
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catch (std::bad_alloc const&) {
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throw agi::AudioCacheOpenError("Couldn't open audio, not enough ram available.");
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}
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decoder = std::thread([&] {
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int64_t readsize = CacheBlockSize / source->GetBytesPerSample();
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for (size_t i = 0; i < blockcache.size(); i++) {
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if (cancelled) break;
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auto actual_read = std::min<int64_t>(readsize, num_samples - i * readsize);
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source->GetAudio(&blockcache[i][0], i * readsize, actual_read);
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decoded_samples += actual_read;
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}
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});
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}
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~RAMAudioProvider() {
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cancelled = true;
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decoder.join();
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}
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};
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void RAMAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const {
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auto charbuf = static_cast<char *>(buf);
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for (int64_t bytes_remaining = count * bytes_per_sample; bytes_remaining; ) {
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if (start >= decoded_samples) {
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memset(charbuf, 0, bytes_remaining);
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break;
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}
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const int i = (start * bytes_per_sample) >> CacheBits;
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const int start_offset = (start * bytes_per_sample) & (CacheBlockSize-1);
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const int read_size = std::min<int>(bytes_remaining, CacheBlockSize - start_offset);
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memcpy(charbuf, &blockcache[i][start_offset], read_size);
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charbuf += read_size;
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bytes_remaining -= read_size;
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start += read_size / bytes_per_sample;
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}
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}
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}
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std::unique_ptr<AudioProvider> CreateRAMAudioProvider(std::unique_ptr<AudioProvider> src) {
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return agi::make_unique<RAMAudioProvider>(std::move(src));
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}
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