| 53d5c463 |
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 convertion is done when needed during sample format convertion |
| 2d38081b | Every step can be skipped without memcpy when its not needed. |
| 53d5c463 | Either Resampling and Rematrixing can be performed first depending on which way its 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 Its also trivial to add special converters for common cases |
| 9fa05db4 | If only sample format and or packed/planar convertion is needed it is performed from input to output directly in a single pass with no intermediates. |