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DOCS/tech-overview.txt: add a section for the new filter framework 

76276c9210 introduced a generic filtering
framework which replaced the separate video and audio filter chains.
Additionally, 6d36fad83c and
76e7e78ce9 made the decoder wrappers
a filter.
Add a new section to document this, and corrrect the outdated
audio/video decoder and filter info.
This commit is contained in:
nanahi 2024-03-07 00:56:25 -05:00 committed by sfan5
parent c254cf42cb
commit 73e08043d2
1 changed files with 16 additions and 12 deletions
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DOCS/tech-overview.txt
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@ -189,6 +189,14 @@ demux/:
cache, which is implemented as a list of packets. The cache is complex
because it support seeking, multiple ranges, prefetching, and so on.
filters/:
Filter related code. filter.c contains the generic filtering framework
which converts input frames to output frames (audio, video, or demux
packet data). f_decoder_wrapper.c is a source filter which connects the
frontend with the actual audio and video decoders. f_output_chain.c handles
VO/AO output conversions. f_autoconvert.c automatically inserts the
appropriate conversion filters if format conversion is needed.
video/:
This contains several things related to audio/video decoding, as well as
video filters.
@ -197,15 +205,11 @@ video/:
internally.
video/decode/:
vd_*.c are video decoders. (There's only vd_lavc.c left.) dec_video.c
handles most of connecting the frontend with the actual decoder.
vd_*.c are video decoders. (There's only vd_lavc.c left.)
video/filter/:
vf_*.c and vf.c form the video filter chain. They are fed by the video
decoder, and output the filtered images to the VOs though vf_vo.c. By
default, no video filters (except vf_vo) are used. vf_scale is automatically
inserted if the video output can't handle the video format used by the
decoder.
vf_*.c are video filters. They are fed by the video decoder, and output the
filtered images to the VOs. By default, no video filters are used.
video/out/:
Video output. They also create GUI windows and handle user input. In most
@ -224,13 +228,13 @@ audio/:
compressed formats used for spdif.)
audio/decode/:
ad_*.c and dec_audio.c handle audio decoding. ad_lavc.c is the
decoder using ffmpeg. ad_spdif.c is not really a decoder, but is used for
compressed audio passthrough.
ad_*.c handle audio decoding. ad_lavc.c is the decoder using ffmpeg.
ad_spdif.c is not really a decoder, but is used for compressed audio
passthrough.
audio/filter/:
Audio filter chain. af_lavrresample is inserted if any form of conversion
between audio formats is needed.
Audio filters. af_scaletempo2 is inserted by default if playback is different
from normal speed.
audio/out/:
Audio outputs.