mirror of https://github.com/odrling/Aegisub
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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// Aegisub Project http://www.aegisub.org/
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#include "config.h"
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#include "video_provider_cache.h"
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#include "options.h"
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#include "video_frame.h"
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#include <algorithm>
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#include <boost/version.hpp>
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#if BOOST_VERSION <= 105200
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// Compilation fails without this with boost 1.52. I have no idea why.
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static bool operator==(VideoFrame const& a, VideoFrame const& b) {
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return a.width == b.width
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&& a.height == b.height
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&& a.pitch == b.pitch
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&& a.flipped == b.flipped
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&& a.data == b.data;
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}
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#endif
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/// A video frame and its frame number
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struct CachedFrame : public VideoFrame {
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int frame_number;
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CachedFrame(int frame_number, VideoFrame const& frame)
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: VideoFrame(frame.data.data(), frame.width, frame.height, frame.pitch, frame.flipped)
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, frame_number(frame_number)
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{
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}
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};
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VideoProviderCache::VideoProviderCache(std::unique_ptr<VideoProvider> parent)
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: master(std::move(parent))
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, max_cache_size(OPT_GET("Provider/Video/Cache/Size")->GetInt() << 20) // convert MB to bytes
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{
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}
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VideoProviderCache::~VideoProviderCache() {
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}
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std::shared_ptr<VideoFrame> VideoProviderCache::GetFrame(int n) {
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size_t total_size = 0;
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for (auto cur = cache.begin(); cur != cache.end(); ++cur) {
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if (cur->frame_number == n) {
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#if BOOST_VERSION <= 105200
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// Until boost 1.52, boost::container::list incorrectly asserted
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// that this != &other, so do an extra splice through an empty list
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decltype(cache) temp;
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temp.splice(temp.begin(), cache, cur);
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cache.splice(cache.begin(), temp, temp.begin());
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#else
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cache.splice(cache.begin(), cache, cur); // Move to front
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#endif
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return std::make_shared<VideoFrame>(cache.front());
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}
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total_size += cur->data.size();
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}
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auto frame = master->GetFrame(n);
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if (total_size >= max_cache_size)
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cache.pop_back();
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cache.emplace_front(n, *frame);
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return frame;
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}
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