forked from mia/Aegisub
125 lines
3.5 KiB
C++
125 lines
3.5 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 "main.h"
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#include "video_provider_cache.h"
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/// DOCME
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/// @class CachedFrame
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/// @brief DOCME
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///
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/// DOCME
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struct CachedFrame {
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/// DOCME
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AegiVideoFrame frame;
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/// DOCME
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int n;
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};
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/// @brief Constructor
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/// @param parent
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///
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VideoProviderCache::VideoProviderCache(VideoProvider *parent)
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: master(parent)
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, cacheMax(OPT_GET("Provider/Video/Cache/Size")->GetInt() << 20) // convert MB to bytes
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{
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}
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/// @brief Destructor
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///
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VideoProviderCache::~VideoProviderCache() {
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while (cache.size()) {
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cache.front().frame.Clear();
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cache.pop_front();
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}
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}
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/// @brief Get frame
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/// @param n
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/// @return
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///
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const AegiVideoFrame VideoProviderCache::GetFrame(int n) {
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// See if frame is cached
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CachedFrame cached;
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for (std::list<CachedFrame>::iterator cur=cache.begin();cur!=cache.end();cur++) {
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cached = *cur;
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if (cached.n == n) {
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cache.erase(cur);
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cache.push_back(cached);
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return cached.frame;
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}
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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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const AegiVideoFrame *srcFrame = &frame;
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// Cache frame
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Cache(n,*srcFrame);
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return *srcFrame;
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}
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/// @brief Add to cache
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/// @param n
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/// @param frame
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void VideoProviderCache::Cache(int n,const AegiVideoFrame frame) {
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// Cache full, use frame at front
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if (GetCurCacheSize() >= cacheMax) {
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cache.push_back(cache.front());
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cache.pop_front();
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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_back(CachedFrame());
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}
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// Cache
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cache.back().n = n;
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cache.back().frame.CopyFrom(frame);
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}
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/// @brief Get the current size of the cache
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/// @return Returns the size in bytes
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unsigned VideoProviderCache::GetCurCacheSize() {
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int sz = 0;
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for (std::list<CachedFrame>::iterator i = cache.begin(); i != cache.end(); i++)
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sz += i->frame.memSize;
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return sz;
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}
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