forked from mia/Aegisub
94 lines
3 KiB
C++
94 lines
3 KiB
C++
// Copyright (c) 2008, Rodrigo Braz Monteiro
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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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//
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// $Id$
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/// @file video_provider_cache.cpp
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/// @brief Aggregate video provider caching previously requested frames
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/// @ingroup video_input
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///
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#include "config.h"
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#include "video_provider_cache.h"
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#include "main.h"
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#include "video_frame.h"
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#ifndef AGI_PRE
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#include <algorithm>
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#include <tr1/functional>
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#endif
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/// A video frame and its frame number
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struct CachedFrame : public AegiVideoFrame {
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int frame_number;
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};
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VideoProviderCache::VideoProviderCache(VideoProvider *parent)
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: master(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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for_each(cache.begin(), cache.end(), std::tr1::mem_fn(&AegiVideoFrame::Clear));
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}
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const AegiVideoFrame VideoProviderCache::GetFrame(int n) {
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size_t total_size = 0;
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// See if frame is cached
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for (std::list<CachedFrame>::iterator cur = cache.begin(); cur != cache.end(); ++cur) {
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if (cur->frame_number == n) {
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cache.push_front(*cur);
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cache.erase(cur);
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return cache.front();
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}
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total_size += cur->memSize;
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}
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// Not cached, retrieve it
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const AegiVideoFrame frame = master->GetFrame(n);
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// Cache full, use oldest frame
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if (total_size >= max_cache_size) {
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cache.push_front(cache.back());
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cache.pop_back();
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}
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// Cache not full, insert new one
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else
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cache.push_front(CachedFrame());
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// Cache
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cache.front().frame_number = n;
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cache.front().CopyFrom(frame);
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return cache.front();
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}
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