mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
45 lines
2.0 KiB
Plaintext
45 lines
2.0 KiB
Plaintext
|
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
|
||
|
|
Every step can be skiped without memcpy when its not needed.
|
||
|
|
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
|