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https://github.com/Harshit-Dhanwalkar/AsciiCam.git
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115 lines
3.9 KiB
Markdown
115 lines
3.9 KiB
Markdown
# AsciiCam
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Real-time ASCII video from your webcam in the terminal - pure C99, no heavy runtime dependencies.
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<img src="assets/demo.gif" width="325">
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### Edge detection + threshold plugin
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<img src="assets/demo-edgedetection.gif" width="325">
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---
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## Features
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| Feature | Details |
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| ------------------------- | ------------------------------------------------------------------------------------- |
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| YUYV to grayscale | SSE2 SIMD (`yuyv_to_gray_simd`) - 16 pixels per iteration |
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| YUYV to RGB | Fixed-point BT.601 conversion for truecolor output |
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| ASCII rendering | Configurable charset, brightness, contrast, invert |
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| Sobel edge detection | L1-norm kernel convolution |
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| Floyd-Steinberg dithering | Error-diffusion to reduce banding |
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| ANSI truecolor | `\033[38;2;R;G;Bm` per-cell coloring |
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| Hot-reload plugin system | `inotify` + `dlopen` - rebuild a filter `.so`, it reloads live |
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| FPS-capped render loop | `CLOCK_MONOTONIC` + `nanosleep` frame pacing |
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| Producer/consumer threads | Double-buffered capture + render (stubbed in main loop, active in `thread_sharing.c`) |
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---
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## Build
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```bash
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git clone https://github.com/Harshit-Dhanwalkar/AsciiCam.git
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cd AsciiCam/C/
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make
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```
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Requires: `gcc`, `linux/videodev2.h` (kernel headers), `libdl`, `libpthread`.
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No other external dependencies.
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```
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build/webcam_ascii --help
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```
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---
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## Run
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```bash
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# Basic (grayscale, 80×40, /dev/video0)
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./build/webcam_ascii
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# Truecolor output
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./build/webcam_ascii -C
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# With all three plugins
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./build/webcam_ascii -p build/invert.so -p build/threshold.so -p build/edge_detect.so
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# Edge detection mode, custom resolution
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./build/webcam_ascii -e -w 320 -h 240 -W 120 -H 50
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# Dithering + inverted charset
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./build/webcam_ascii -D -i
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```
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---
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## Plugin system
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Plugins are shared objects (`.so`).
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```bash
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gcc -O2 -fPIC -shared -Iinclude filters/my_filter.c -o build/my_filter.so
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./build/webcam_ascii -p build/my_filter.so
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```
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**Hot-reload:** the binary watches the `.so` with `inotify`. Recompile it while the viewer is running and it reloads automatically within $\approx$100 ms.
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**Runtime controls:**
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| Key | Action |
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|---|---|
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| `↑` / `↓` | select plugin |
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| `[` / `]` | param $\pm$1 |
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| `{` / `}` | param $\pm$10 |
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| `r` | reset param to 128 |
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| `q` | quit |
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---
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## TODO
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- [x] Adjustable capture resolution
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- [x] Producer/consumer thread split (double-buffered)
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- [x] Brightness / contrast adjustment
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- [x] Invert brightness to charset mapping
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- [x] ANSI truecolor output
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- [x] Floyd-Steinberg dithering
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- [x] Sobel edge detection
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- [x] SIMD YUYV to grayscale (SSE2)
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- [x] Hot-reload plugin system
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- [x] nolibc - zero libc calls
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- [ ] Custom charset via config file
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- [ ] Record to `.mp4` / `.gif`
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- [ ] Inter-frame delta compression
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- [ ] LUT cache optimization
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- [ ] Replace `pthread` with raw `futex` syscalls
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- [ ] Replace `dlopen` with a minimal ELF loader
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## Fixes
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- [ ] [Issue #2](https://github.com/Harshit-Dhanwalkar/AsciiCam/issues/2) MacOS support
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- Rewrite `capture.c` for MacOS port using [AVFoundation](https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html). ([Stackoverflow : how do I set up a video input using the AVFoundation framework](https://stackoverflow.com/questions/32053460/how-do-i-set-up-a-video-input-using-the-avfoundation-framework))
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---
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Project is under [PolyForm Noncommercial License BY-NC](LICENCE).
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For commercial use contact *harshitpd1729@gmail.com*.
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