ffmpeg implemented

tools/ffmpeg/README.md

@@ -0,0 +1,45 @@
+# FFmpeg (Optional) for Native Playback
+
+The native player uses an external **FFmpeg** binary to decode radio streams.
+
+## Why this exists
+
+- The app intentionally does **not** download or embed FFmpeg automatically.
+- You provide FFmpeg yourself (license/compliance-friendly).
+
+## How the app finds FFmpeg
+
+At runtime it searches in this order:
+
+1. `RADIOPLAYER_FFMPEG` environment variable (absolute or relative path)
+2. Next to the application executable (Windows: `ffmpeg.exe`, macOS/Linux: `ffmpeg`)
+3. Common bundle resource folders relative to the executable:
+   - `resources/ffmpeg(.exe)`
+   - `Resources/ffmpeg(.exe)`
+   - `../resources/ffmpeg(.exe)`
+   - `../Resources/ffmpeg(.exe)`
+4. Your system `PATH`
+
+## Recommended setup (Windows dev)
+
+- Put `ffmpeg.exe` somewhere stable, then set:
+
+`RADIOPLAYER_FFMPEG=C:\\path\\to\\ffmpeg.exe`
+
+Or copy `ffmpeg.exe` next to the built app binary:
+
+- `src-tauri/target/debug/ffmpeg.exe` (dev)
+- `src-tauri/target/release/ffmpeg.exe` (release)
+
+## Optional: download helper (Windows)
+
+You can also run:
+
+`npm run ffmpeg:download`
+
+This downloads a prebuilt FFmpeg zip and extracts `ffmpeg.exe` into `tools/ffmpeg/bin/ffmpeg.exe`.
+
+## Notes
+
+- The player will fail fast with a clear error if FFmpeg is missing.
+- The project already includes a copy step (`tools/copy-ffmpeg.js`) that runs before `tauri`/`build` and places FFmpeg into `src-tauri/resources/` for bundling.