diff options
| -rw-r--r-- | doc/swscale.txt | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/doc/swscale.txt b/doc/swscale.txt index b078f27cce..6c84942627 100644 --- a/doc/swscale.txt +++ b/doc/swscale.txt @@ -36,12 +36,14 @@ special converter Main path The main path is used when no special converter can be used, the code is designed as a destination line pull architecture. That is for each - output line the vertical scaler pulls lines from a ring buffer that - when the line is unavailable pulls it from the horizontal scaler and - input converter of the current slice. - When no more output can be generated as lines from a next slice would - be needed then all remaining lines in the current slice are converted - and horizontally scaled and put in the ring buffer. + output line the vertical scaler pulls lines from a ring buffer. When + the ring buffer does not contain the wanted line then it is pulled from + the input slice through the input converter and horizontal scaler, and + the result is also stored in the ring buffer to serve future vertical + scaler requests. + When no more output can be generated because lines from a future slice + would be needed, then all remaining lines in the current slice are + converted, horizontally scaled and put in the ring buffer. [this is done for luma and chroma, each with possibly different numbers of lines per picture] |