Bandwidth and buffering issues on some scenes

f0o · 9 July 2017 11:04

xbmc/xbmc/blob/c5eb848739f0bb34d2ef74c3354e27e78f69567b/xbmc/filesystem/FileCache.cpp#L201


      
          if (m_fileSize > 0 && m_fileSize < g_advancedSettings.m_cacheMemSize && !(m_flags & READ_AUDIO_VIDEO))
          {
            // NOTE: We don't need to take into account READ_MULTI_STREAM here as it's only used for audio/video
            cacheSize = m_fileSize;
          }
          else
          {
            cacheSize = g_advancedSettings.m_cacheMemSize;
          }
          
          
size_t back = cacheSize / 4;
          size_t front = cacheSize - back;
          
          
if (m_flags & READ_MULTI_STREAM)
          {
            // READ_MULTI_STREAM requires double buffering, so use half the amount of memory for each buffer
            front /= 2;
            back /= 2;
          }
          m_pCache = new CCircularCache(front, back);
          m_forwardCacheSize = front;

It actually is using a Circular Cache with a sliding window of 4th of the cachesize.

Now the operation used doesnt inherit a requirement of 3x free cache size.

Even when Multi-Stream is used, they divide the cacheSize by two before duplicating the CircularCache object.

Still digging though