forked from mia/Aegisub
97 lines
3.4 KiB
C++
97 lines
3.4 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 "include/aegisub/video_provider.h"
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#include "options.h"
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#include "video_frame.h"
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#include <libaegisub/make_unique.h>
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#include <list>
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namespace {
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/// A video frame and its frame number
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struct CachedFrame final : 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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/// @class VideoProviderCache
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/// @brief A wrapper around a video provider which provides LRU caching
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class VideoProviderCache final : public VideoProvider {
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/// The source provider to get frames from
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std::unique_ptr<VideoProvider> master;
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/// @brief Maximum size of the cache in bytes
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///
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/// Note that this is a soft limit. The cache stops allocating new frames
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/// once it has exceeded the limit, but it never tries to shrink
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const size_t max_cache_size;
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/// Cache of video frames with the most recently used ones at the front
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std::list<CachedFrame> cache;
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public:
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VideoProviderCache(std::unique_ptr<VideoProvider> master)
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: master(std::move(master))
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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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std::shared_ptr<VideoFrame> GetFrame(int n) override;
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int GetFrameCount() const override { return master->GetFrameCount(); }
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int GetWidth() const override { return master->GetWidth(); }
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int GetHeight() const override { return master->GetHeight(); }
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double GetDAR() const override { return master->GetDAR(); }
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agi::vfr::Framerate GetFPS() const override { return master->GetFPS(); }
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std::vector<int> GetKeyFrames() const override { return master->GetKeyFrames(); }
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std::string GetWarning() const override { return master->GetWarning(); }
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std::string GetDecoderName() const override { return master->GetDecoderName(); }
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std::string GetColorSpace() const override { return master->GetColorSpace(); }
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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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cache.splice(cache.begin(), cache, cur); // Move to front
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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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}
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std::unique_ptr<VideoProvider> CreateCacheVideoProvider(std::unique_ptr<VideoProvider> parent) {
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return agi::make_unique<VideoProviderCache>(std::move(parent));
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}
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