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- Default: dablin -w so ffmpeg reads rate and channels from WAV header; all DAB+ services (24/32/48 kHz, mono/stereo) play at correct speed. - Fallback: OPENWEBRX_DAB_USE_WAV=0 uses PCM path with OPENWEBRX_DAB_INPUT_RATE (24000|32000|48000). - Fix: treat dablin output as stereo (-ac 2); mono caused consistently slow playback. - Optional OPENWEBRX_DAB_CAPTURE_RAW=1 for raw PCM capture (PCM path). - README-FORK.md: document env vars and behaviour.
31 lines
2 KiB
Markdown
31 lines
2 KiB
Markdown
# dom-robinson/openwebrx fork – DAB+ sample rate fix
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This is a clone of [dom-robinson/openwebrx](https://github.com/dom-robinson/openwebrx) with branch **feature/dab-audio-fix** containing improvements over upstream [jketterl/openwebrx PR #419](https://github.com/jketterl/openwebrx/pull/419): **Fix DAB+ audio sample rate issues using ffmpeg resampling**.
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## What’s in this branch
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- **owrx/dab/dablin.py** – DAB+ audio fix with **automatic handling of all sample rates (24/32/48 kHz)** and mono/stereo:
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- **Default (WAV path):** `dablin -w` so ffmpeg reads sample rate and channel count from the WAV header; resample to 48 kHz stereo. All DAB+ services play at correct speed without configuration.
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- **Fallback (PCM path):** Set `OPENWEBRX_DAB_USE_WAV=0` and optionally `OPENWEBRX_DAB_INPUT_RATE=24000|32000|48000` if WAV causes issues. Optional `OPENWEBRX_DAB_CAPTURE_RAW=1` tees raw PCM to `/tmp/dablin_capture.raw` for analysis.
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- **Critical fix:** Treat dablin output as **stereo** (`-ac 2`) when using PCM; using mono caused consistently slow playback.
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- **docker/scripts/install-dependencies.sh** – Add `sox` to static packages.
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- **Dockerfile.hotfix** – Optional image that builds dablin from source and applies the dablin.py patch.
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## Environment variables (optional)
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| Variable | Default | Description |
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|----------|---------|-------------|
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| `OPENWEBRX_DAB_USE_WAV` | `1` | Use dablin WAV output so rate/channels are automatic. Set `0` to use PCM path with fixed rate. |
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| `OPENWEBRX_DAB_INPUT_RATE` | `32000` | Only when `OPENWEBRX_DAB_USE_WAV=0`: input rate 24000, 32000, or 48000. |
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| `OPENWEBRX_DAB_CAPTURE_RAW` | unset | Set to `1` to tee raw PCM to `/tmp/dablin_capture.raw` (PCM path only, for analysis). |
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## Push this branch to the fork
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From this directory, with GitHub auth set up:
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```bash
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git push -u origin feature/dab-audio-fix
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```
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After pushing, the fork on GitHub will list the branch and you can open or update a PR to jketterl/openwebrx, or build images from it.
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