avisynth/avisynthplus

How avisynth/avisynthplus works

AviSynth+ is a scriptable video frameserver: a host uses its API to create a script environment, scripts describe clip/filter operations, and the resulting clips provide frames to the host. Its capabilities include built-in video and audio filters, format conversion and resampling, plugin loading, AVI input, and CPU/device-aware processing. The graph preserves major subsystems from the tree and source index; some filter and plugin relationships are documented only by their module locations, so those links are dashed and unverified.

Main entry points: InternalEnvironment.h Script Environment · convert_planar.cpp Pixel Conversion · FilterGraph.cpp Filter Graph · scriptparser.cpp Script Parser

Components 22

Host API and Runtime

Plugin API avs_core/include/avisynth.h
Script Environment avs_core/core/InternalEnvironment.h
Runtime Core avs_core/core/internal.h
Runtime Strings avs_core/core/strings.h

Scripting and Plugins

Script Parser avs_core/core/parser/scriptparser.cpp
Expression Engine avs_core/core/parser/expression.h
Function Dispatch avs_core/core/function.h
Plugin Manager avs_core/core/PluginManager.cpp
Filter Graph avs_core/core/FilterGraph.cpp

Media Processing

Built-in Filters avs_core/filters/source.cpp
Expr Filter avs_core/filters/exprfilter/exprfilter.cpp
Resampling avs_core/filters/resample.cpp
Resample Definitions avs_core/filters/resample.h
Pixel Conversion avs_core/convert/convert_planar.cpp
Conversion Interfaces avs_core/convert/convert.h
Bit Conversion avs_core/convert/convert_bits.h
Conversion Helpers avs_core/convert/convert_helper.h
SIMD Kernels

Sources and Devices

AVI Source avs_core/filters/AviSource/AVIReadHandler.cpp
Device Manager avs_core/core/DeviceManager.cpp
External Filters plugins

Other components

Host Application

Connections 24

Host Application → Plugin API: uses API README.md
Plugin API → Script Environment: exposes runtime avs_core/include/avisynth.h
Script Environment → Function Dispatch: dispatches functions avs_core/core/InternalEnvironment.h
Script Environment → Plugin Manager: manages plugins avs_core/core/PluginManager.cpp
Plugin Manager → Script Environment: registers functions avs_core/core/PluginManager.cpp
Plugin Manager → Runtime Strings: uses strings avs_core/core/PluginManager.cpp
Script Parser → Script Environment: uses environment avs_core/core/parser/scriptparser.cpp
Script Parser → Expression Engine: parses expressions
Script Parser → Function Dispatch: builds scripts
Script Environment → Filter Graph: constructs graph
Filter Graph → Built-in Filters: evaluates clips
Filter Graph → AVI Source: requests frames
Built-in Filters → Resampling: uses resampling
Resampling → Resample Definitions: uses definitions avs_core/filters/resample.cpp
Resampling → Pixel Conversion: uses conversion avs_core/filters/resample.cpp
Pixel Conversion → Conversion Interfaces: implements interface avs_core/convert/convert_planar.cpp
Pixel Conversion → Conversion Helpers: uses helpers avs_core/convert/convert_planar.cpp
Pixel Conversion → Bit Conversion: uses bit conversion avs_core/convert/convert_planar.cpp
Pixel Conversion → SIMD Kernels: uses SIMD
Expr Filter → Pixel Conversion: uses conversion avs_core/filters/exprfilter/exprfilter.cpp
Device Manager → Script Environment: uses environment avs_core/core/DeviceManager.cpp
Device Manager → Filter Graph: wraps clips
External Filters → Plugin API: implements plugins README.md
Host Application → AVI Source: receives frames README.md

Drawn by GitDiagram on November 14, 2026 from the repository's file tree, README and source files. Read as Markdown ·