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| author | Tim Redfern <tim@eclectronics.org> | 2013-08-26 15:10:18 +0100 |
|---|---|---|
| committer | Tim Redfern <tim@eclectronics.org> | 2013-08-26 15:10:18 +0100 |
| commit | 150c9823e71a161e97003849cf8b2f55b21520bd (patch) | |
| tree | 3559c840cf403d1386708b2591d58f928c7b160d /ffmpeg1/doc/swresample.txt | |
| parent | b4b1e2630c95d5e6014463f7608d59dc2322a3b8 (diff) | |
adding ffmpeg specific version
Diffstat (limited to 'ffmpeg1/doc/swresample.txt')
| -rw-r--r-- | ffmpeg1/doc/swresample.txt | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/ffmpeg1/doc/swresample.txt b/ffmpeg1/doc/swresample.txt new file mode 100644 index 0000000..2d192a3 --- /dev/null +++ b/ffmpeg1/doc/swresample.txt @@ -0,0 +1,46 @@ + The official guide to swresample for confused developers. + ========================================================= + +Current (simplified) Architecture: +--------------------------------- + Input + v + __________________/|\___________ + / | \ + / input sample format convert v + / | ___________/ + | |/ + | v + | ___________/|\___________ _____________ + | / | \ | | + | Rematrix | resample <---->| Buffers | + | \___________ | ___________/ |_____________| + v \|/ +Special Converter v + v ___________/|\___________ _____________ + | / | \ | | + | Rematrix | resample <---->| Buffers | + | \___________ | ___________/ |_____________| + | \|/ + | v + | |\___________ + \ | \ + \ output sample format convert v + \_________________ | ___________/ + \|/ + v + Output + +Planar/Packed conversion is done when needed during sample format conversion. +Every step can be skipped without memcpy when it is not needed. +Either Resampling and Rematrixing can be performed first depending on which +way it is faster. +The Buffers are needed for resampling due to resamplng being a process that +requires future and past data, it thus also introduces inevitably a delay when +used. +Internally 32bit float and 16bit int is supported currently, other formats can +easily be added. +Externally all sample formats in packed and planar configuration are supported +It's also trivial to add special converters for common cases. +If only sample format and/or packed/planar conversion is needed, it +is performed from input to output directly in a single pass with no intermediates. |