From 4a0266a0ecf1cad6ee8ce0aada18bdf0f5a861d0 Mon Sep 17 00:00:00 2001 From: Ramiro Polla Date: Sun, 14 Sep 2008 22:15:11 +0000 Subject: Spelling... Originally committed as revision 15327 to svn://svn.ffmpeg.org/ffmpeg/trunk --- doc/swscale.txt | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) (limited to 'doc/swscale.txt') diff --git a/doc/swscale.txt b/doc/swscale.txt index 8b95477835..e581d6263c 100644 --- a/doc/swscale.txt +++ b/doc/swscale.txt @@ -24,18 +24,18 @@ Current (simplified) Architecture: output -Swscale has 2 scaler paths, each side must be capable to handle -slices, that is consecutive non overlapping rectangles of dimension +Swscale has 2 scaler paths. Each side must be capable of handling +slices, that is, consecutive non-overlapping rectangles of dimension (0,slice_top) - (picture_width, slice_bottom) special converter - This generally are unscaled converters of common + These generally are unscaled converters of common formats, like YUV 4:2:0/4:2:2 -> RGB15/16/24/32. Though it could also in principle contain scalers optimized for specific common cases. 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 + 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. 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 @@ -49,20 +49,20 @@ Main path Input to YUV Converter When the input to the main path is not planar 8bit per component yuv or - 8bit gray then it is converted to planar 8bit YUV, 2 sets of converters - exist for this currently one performing horizontal downscaling by 2 + 8bit gray then it is converted to planar 8bit YUV. 2 sets of converters + exist for this currently, one performing horizontal downscaling by 2 before the conversion and the other leaving the full chroma resolution but being slightly slower. The scaler will try to preserve full chroma - here when the output uses it, its possible to force full chroma with - SWS_FULL_CHR_H_INP though even for cases where the scaler thinks its + here when the output uses it. It is possible to force full chroma with + SWS_FULL_CHR_H_INP though even for cases where the scaler thinks it is useless. Horizontal scaler - There are several horizontal scalers, a special case worth mentioning is + There are several horizontal scalers. A special case worth mentioning is the fast bilinear scaler that is made of runtime generated MMX2 code using specially tuned pshufw instructions. - The remaining scalers are specially tuned for various filter lengths - they scale 8bit unsigned planar data to 16bit signed planar data. + The remaining scalers are specially tuned for various filter lengths. + They scale 8bit unsigned planar data to 16bit signed planar data. Future >8bit per component inputs will need to add a new scaler here that preserves the input precision. -- cgit v1.2.3