const AegiVideoFrame VideoProviderCache::GetFrame(int n) {
size_t total_size = 0;
// See if frame is cached
for (auto cur = cache.begin(); cur != cache.end(); ++cur) {
if (cur->frame_number == n) {
cache.push_front(*cur);
cache.erase(cur);
return cache.front();
}
total_size += cur->memSize;
}
// Not cached, retrieve it
const AegiVideoFrame frame = master->GetFrame(n);
// Cache full, use oldest frame
if (total_size >= max_cache_size) {
cache.push_front(cache.back());
cache.pop_back();
}
// Cache not full, insert new one
else
cache.push_front(CachedFrame());
// Cache
cache.front().frame_number = n;
cache.front().CopyFrom(frame);
return cache.front();
}
/// @brief Add to cache
/// @param n
/// @param frame
void VideoProviderCache::Cache(int n,const AegiVideoFrame frame) {
// Cache full, use frame at front
if (GetCurCacheSize() >= cacheMax) {
cache.push_back(cache.front());
cache.pop_front();
}
// Cache not full, insert new one
else {
cache.push_back(CachedFrame());
}
// Cache
cache.back().n = n;
cache.back().frame.CopyFrom(frame);
}