Module video_processing 

Video processing module for VeridianOS

Provides four major subsystems:

1. AVI container parser – RIFF/AVI header parsing, stream demuxing, index (idx1) parsing, and frame extraction.
2. Frame rate conversion – Frame duplication, frame dropping, 3:2 pulldown (telecine), timestamp-based selection, and motion-compensated linear blend interpolation. All math is integer-only.
3. Subtitle overlay – SRT parser, timestamp matching, 8x16 bitmap font text rendering with semi-transparent background, multi-line word wrapping, and configurable margins.
4. Real-time audio scheduling – Deadline scheduler integration for audio threads with period-based wake scheduling, latency/jitter tracking, underrun/overrun statistics, and CPU reservation.

All arithmetic is integer or fixed-point. No floating-point is used anywhere.

Structs

AudioSchedParams

Audio scheduling parameters for a single audio thread.

AudioSchedStats

Statistics for a single audio thread’s scheduling behavior.

AudioScheduler

Real-time audio scheduler manager.

AviContainer

Parsed AVI container.

AviFlags

AVI file flags from the main header (avih).

AviIndexEntry

An entry in the AVI index (idx1 chunk).

AviMainHeader

AVI main header (avih chunk) – 56 bytes.

AviStreamHeader

AVI stream header (strh chunk) – 56 bytes.

AviStreamInfo

Information about a parsed AVI stream.

BitmapInfoHeader

BitmapInfoHeader (BITMAPINFOHEADER) – 40 bytes. Used in video strf chunks to describe the video format.

FourCC

Four-character code (FourCC) used throughout RIFF/AVI.

FrameMapEntry

A single entry in the frame map produced by FrameRateConverter::build_frame_map.

FrameRateConverter

Frame rate converter state.

SubtitleConfig

Subtitle overlay configuration.

SubtitleEntry

A single subtitle entry parsed from SRT format.

SubtitleTrack

Subtitle track holding all parsed entries.

WaveFormatEx

WaveFormatEx (WAVEFORMATEX) – 18 bytes minimum. Used in audio strf chunks to describe the audio format.

Enums

AudioPriorityClass

Audio thread priority class, mapped to the kernel deadline scheduler.

AudioSchedError

Errors from the audio real-time scheduler.

FrameRateMode

Frame rate conversion mode.

StreamType

Stream type tag.