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…the buffer There was an off-by-one error when checking if the IO buffer still has enough space till the end. One more byte can be safely written. Signed-off-by: Marton Balint <cus@passwd.hu>
Existing code did not check if the requested seekback buffer is already read entirely. In this case, nothing has to be done to guarantee seekback. Signed-off-by: Marton Balint <cus@passwd.hu>
The new buf_size was detemined too conservatively, maybe because of the off-by-one issue which was fixed recently in fill_buffer. We can safely substract 1 more from the new buffer size, because max_buffer_size space must only be guaranteed when we are reading the last byte of the requested window. Comparing the new buf_size against filled did not make a lot of sense, what makes sense is that we want to reallocate the buffer if the new buf_size is bigger than the old, therefore the change in the check. Signed-off-by: Marton Balint <cus@passwd.hu>
…ck if needed Previously ffio_ensure_seekback never flushed the buffer, so successive ffio_ensure_seekback calls were all respected. This could eventually cause unlimited memory and CPU usage if a demuxer called ffio_ensure_seekback on all it's read data. Most demuxers however only rely on being able to seek back till the position of the last ffio_ensure_seekback call, therefore we change the semantics of ffio_ensure_seekback so that a new call can invalidate seek guarantees of the old. In order to support some level of "nested" ffio_ensure_seekback calls, we document that the function only invalidates the old window (and potentially discards the already read data from the IO buffer), if the newly requested window does not fit into the old one. This way we limit the memory usage for ffio_ensure_seekback calls requesting consecutive data windows. Signed-off-by: Marton Balint <cus@passwd.hu>
…k if not needed Let's move unread data to the start of the old buffer instead. Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Marton Balint <cus@passwd.hu>
…ize for streamed data This should increase the effectiveness of ffio_ensure_seekback by reducing the number of buffer reallocations and memmoves/memcpys because even a small seekback window requires max_buffer_size+window_size buffer space. Signed-off-by: Marton Balint <cus@passwd.hu>
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This tries to fix xbmc/xbmc#21603 by backporting the relevant upstream changes for the aviobuf allocation logic.