40 lines
1.5 KiB
Markdown
40 lines
1.5 KiB
Markdown
# blax_webrtc — Rust media core
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The timing-critical WebRTC media path for `blax-software/laravel-webrtc`, so that
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PHP never runs per-20ms real-time DSP.
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## Why Rust here
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Handling **connections** concurrently in PHP is a solved problem (Swoole,
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FrankenPHP, ReactPHP). What is *not* proven is sustained per-packet media DSP
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(decrypt SRTP + Opus + RTP jitter every 20ms) glitch-free in single-threaded PHP.
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That work belongs in a language built for it. `str0m` is **sans-IO** (no threads
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or async of its own — you feed it bytes), which makes it ideal to embed and drive
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from PHP.
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- `str0m` owns ICE / DTLS / SRTP / RTP / Opus.
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- `ext-php-rs` exposes a thin function surface to PHP.
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- PHP (`Str0mMediaEngine`) forwards SDP/ICE/control across the FFI boundary and
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calls back into Laravel for persistence (recordings, transmission rows).
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## Build
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```bash
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# one-time: cargo + the ext-php-rs helper
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cargo install cargo-php
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cd rust
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cargo php install --release # compiles the cdylib, installs it as the `blax_webrtc` extension
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php -m | grep blax_webrtc # verify it loaded
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```
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Then set `WEBRTC_MEDIA_ENGINE=BlaxSoftware\LaravelWebRtc\Media\Str0mMediaEngine`.
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## Status
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Scaffold. `src/lib.rs` documents the intended FFI functions
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(`blax_webrtc_offer`, `..._add_ice_candidate`, `..._start_recording`,
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`..._connect_peers`, `..._bridge`, `..._close`) that `Str0mMediaEngine` forwards
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to. Implement them against `str0m`'s RTP/Frame API, then flip the PHP engine off
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`NullMediaEngine`.
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