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docs: refresh README for current runtime and control surface

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@@ -1,101 +1,290 @@
# fm-rds-tx # fm-rds-tx


Go-based FM stereo transmitter with RDS. Supports ADALM-Pluto (PlutoSDR) and any SoapySDR-compatible TX device.
Go-based FM stereo transmitter with RDS. Supports ADALM-Pluto (PlutoSDR) and SoapySDR-compatible TX devices.


## Status: v0.7.0-pre — hardware bring-up milestone
## Status


### What works
- Complete DSP chain: pre-emphasis → stereo encoding → RDS (IEC 62106) → MPX → limiter → FM modulation
- Real hardware TX via SoapySDR CGO binding (PlutoSDR tested)
- Continuous TX engine with Start/Stop/Stats
- IQ resampling (composite rate → device rate)
- HTTP control plane with /tx/start, /tx/stop, /runtime
- 82 passing tests including spectral verification
**Current status:** `v0.7.0-pre` — hardware bring-up milestone


### Signal path
```
Audio Source → PreEmphasis(50µs) → StereoEncoder(19k+38k) → RDS(57k)
→ MPX Combiner → Limiter → FM Modulator(±75kHz)
→ IQ Resample(228k→528k) → SoapySDR → PlutoSDR RF
What is already in place:
- complete DSP chain: audio -> pre-emphasis -> stereo encoding -> RDS -> MPX -> limiter -> FM modulation
- real hardware TX paths for PlutoSDR / SoapySDR backends
- continuous TX engine with runtime telemetry
- dry-run, offline generation, and simulated TX modes
- HTTP control plane with live config patching and runtime/status endpoints
- browser UI on `/`
- live audio ingestion via stdin or HTTP stream input

## Signal path

```text
Audio Source -> PreEmphasis(50us/75us/off) -> StereoEncoder(19k + 38k DSB-SC)
-> RDS(57k BPSK) -> MPX Combiner -> Limiter -> FM Modulator(+/-75kHz)
-> optional split-rate FM upsampling -> SDR backend -> RF output
``` ```


For deeper DSP details, see:
- `docs/DSP-CHAIN.md`

## Prerequisites

### Go
- Go version from `go.mod` (currently Go 1.22)

### Native SDR dependencies
Depending on backend, native libraries are required:

- **SoapySDR backend**
- build with `-tags soapy`
- requires SoapySDR native library (`SoapySDR.dll` / `libSoapySDR.so` / `libSoapySDR.dylib`)
- on Windows, PothosSDR is the expected setup

- **Pluto backend**
- uses native `libiio`
- Windows expects `libiio.dll`
- Linux build/runtime expects `pkg-config` + `libiio`

### Hardware / legal
- validate RF output, deviation, filtering, and power with proper measurement equipment
- use only within applicable legal and regulatory constraints

## Quick start

## Build ## Build


```powershell ```powershell
# Without hardware (simulation/offline only):
# Build CLI tools without hardware-specific build tags:
go build ./cmd/fmrtx go build ./cmd/fmrtx
go build ./cmd/offline go build ./cmd/offline


# With SoapySDR hardware support (requires PothosSDR installed):
# Build fmrtx with SoapySDR support:
go build -tags soapy ./cmd/fmrtx go build -tags soapy ./cmd/fmrtx
``` ```


## Usage
## Quick verification

```powershell
# Print effective config
go run ./cmd/fmrtx -print-config

# Run tests
go test ./...

# Basic dry-run summary
go run ./cmd/fmrtx --dry-run --dry-output build/dryrun/frame.json
```

For additional build/test commands, see:
- `docs/README.md`

## Common usage flows

### 1) List available SDR devices


### List available SDR devices
```powershell ```powershell
.\fmrtx.exe --list-devices .\fmrtx.exe --list-devices
``` ```


### Offline IQ file generation
### 2) Dry-run / config verification

```powershell ```powershell
.\fmrtx.exe --dry-run --dry-output build/dryrun/frame.json .\fmrtx.exe --dry-run --dry-output build/dryrun/frame.json

# Write dry-run JSON to stdout
.\fmrtx.exe --dry-run --dry-output -
```

### 3) Offline IQ/composite generation

```powershell
go run ./cmd/offline -duration 2s -output build/offline/composite.iqf32 go run ./cmd/offline -duration 2s -output build/offline/composite.iqf32

# Optional output rate override
go run ./cmd/offline -duration 500ms -output build/offline/composite.iqf32 -output-rate 228000
```

### 4) Simulated transmit path

```powershell
go run ./cmd/fmrtx --simulate-tx --simulate-output build/sim/simulated-soapy.iqf32 --simulate-duration 250ms
``` ```


### Real TX (PlutoSDR)
### 5) Real TX with config file

```powershell ```powershell
# Start with manual TX control via HTTP:
# Start TX service with manual start over HTTP
.\fmrtx.exe --tx --config docs/config.plutosdr.json .\fmrtx.exe --tx --config docs/config.plutosdr.json


# Start with auto-TX on launch:
# Start and begin transmitting immediately
.\fmrtx.exe --tx --tx-auto-start --config docs/config.plutosdr.json .\fmrtx.exe --tx --tx-auto-start --config docs/config.plutosdr.json
``` ```


### HTTP control
### 6) Live audio via stdin

```powershell
ffmpeg -i "http://svabi.ch:8443/stream" -f s16le -ar 44100 -ac 2 - | .\fmrtx.exe --tx --tx-auto-start --audio-stdin --config docs/config.plutosdr.json
```

### 7) Custom audio input rate

```powershell
ffmpeg -i source.wav -f s16le -ar 48000 -ac 2 - | .\fmrtx.exe --tx --tx-auto-start --audio-stdin --audio-rate 48000 --config docs/config.plutosdr.json
```

## CLI overview

## `fmrtx`
Important runtime modes and flags include:
- `--tx`
- `--tx-auto-start`
- `--dry-run`
- `--dry-output <path|- >`
- `--simulate-tx`
- `--simulate-output <path>`
- `--simulate-duration <duration>`
- `--config <path>`
- `--print-config`
- `--list-devices`
- `--audio-stdin`
- `--audio-rate <hz>`

## `offline`
Useful flags include:
- `-duration <duration>`
- `-output <path>`
- `-output-rate <hz>`

If the README is too high-level for the exact CLI surface, check:
- `cmd/fmrtx/main.go`
- `cmd/offline/main.go`

## HTTP control plane

Base URL: `http://{listenAddress}` (default typically `127.0.0.1:8088`)

### Main endpoints

```text
GET / browser UI
GET /healthz health check
GET /status current config/status snapshot
GET /runtime live engine/driver/audio telemetry
GET /config full config
POST /config patch config / live updates
GET /dry-run synthetic frame summary
POST /tx/start start transmission
POST /tx/stop stop transmission
POST /audio/stream push raw S16LE stereo PCM into live stream buffer
``` ```
POST http://localhost:8088/tx/start → start transmission
POST http://localhost:8088/tx/stop → stop transmission
GET http://localhost:8088/runtime → engine + driver telemetry
GET http://localhost:8088/status → config status
GET http://localhost:8088/config → full config
POST http://localhost:8088/config → patch config (freq, RDS, etc.)
GET http://localhost:8088/dry-run → dry-run summary
GET http://localhost:8088/healthz → health check

### What the control plane covers
- TX start / stop
- runtime status and driver telemetry
- config inspection
- live patching of selected parameters
- dry-run inspection
- browser-accessible control UI
- optional HTTP audio ingest

### Live config notes
`POST /config` supports live updates for selected fields such as:
- frequency
- stereo enable/disable
- pilot / RDS injection levels
- RDS enable/disable
- limiter settings
- PS / RadioText

Some parameters are saved but not live-applied and require restart.

For the full API contract, examples, live-patch semantics, and `/audio/stream` details, see:
- `docs/API.md`

## Configuration

Sample configs:
- `docs/config.sample.json`
- `docs/config.plutosdr.json`
- `docs/config.orangepi-pluto-soapy.json`

Important config areas include:
- `fm.*`
- `rds.*`
- `audio.*`
- `backend.*`
- `control.*`

Examples of relevant fields you may want to inspect:
- `fm.outputDrive`
- `fm.mpxGain`
- `fm.bs412Enabled`
- `fm.bs412ThresholdDBr`
- `fm.fmModulationEnabled`
- `backend.kind`
- `backend.driver`
- `backend.deviceArgs`
- `backend.uri`
- `backend.deviceSampleRateHz`
- `backend.outputPath`
- `control.listenAddress`

For deeper config/API behavior, refer to:
- `internal/config/config.go`
- `docs/API.md`
- `docs/config.sample.json`

## Development and testing

Useful commands:

```powershell
go test ./...
go run ./cmd/fmrtx -print-config
go run ./cmd/fmrtx -config docs/config.sample.json
go run ./cmd/fmrtx --dry-run --dry-output build/dryrun/frame.json
go run ./cmd/fmrtx --simulate-tx --simulate-output build/sim/simulated-soapy.iqf32 --simulate-duration 250ms
go run ./cmd/offline -duration 500ms -output build/offline/composite.iqf32
``` ```


## PlutoSDR notes
See also:
- `docs/README.md`


- Device rate: 528 kHz (PlutoSDR minimum ~521 kHz)
- IQ format: CF32 (float32 interleaved I/Q)
- Gain range: 0–89 dB (`outputDrive` 0..1 maps to 0..89 dB)
- SoapySDR driver name: `plutosdr`
- Requires: PothosSDR or SoapySDR + SoapyPlutoSDR plugin installed
## PlutoSDR / backend notes

- PlutoSDR commonly runs with a device-side sample rate above composite rate, so split-rate mode may be used automatically
- SoapySDR backend is suitable for Soapy-compatible TX hardware
- backend/device settings are selected through config rather than hardcoded paths
- runtime telemetry should be used to inspect effective TX state during operation


## Repository layout ## Repository layout


```text ```text
cmd/ cmd/
fmrtx/ main CLI (--tx, --dry-run, --simulate-tx, --list-devices)
offline/ offline IQ file generator
fmrtx/ main CLI
offline/ offline generator
internal/ internal/
app/ TX engine (continuous chunk loop) + simulated transmit
audio/ sample types, WAV loader, resampler, tone generator
config/ config schema, validation, PI parsing
control/ HTTP control plane (/tx/start, /tx/stop, /runtime)
dryrun/ JSON dry-run summaries
dsp/ oscillator, pre-emphasis, FM modulator, limiter, Goertzel, IQ resampler
mpx/ MPX combiner
offline/ offline composite generation (full DSP chain)
output/ backend abstractions (file, dummy)
platform/ SoapyDriver interface, SoapyBackend, SimulatedDriver
platform/soapysdr/ CGO SoapySDR native binding (build tag: soapy)
rds/ RDS encoder (IEC 62106, CRC, differential, group scheduler)
stereo/ stereo encoder (19 kHz pilot, 38 kHz DSB-SC)
app/ TX engine + runtime state
audio/ audio input, resampling, tone generation, stream buffering
config/ config schema and validation
control/ HTTP control plane + browser UI
dryrun/ dry-run JSON summaries
dsp/ DSP primitives
mpx/ MPX combiner
offline/ full offline composite generation
output/ output/backend abstractions
platform/ backend abstractions and device/runtime stats
platform/soapysdr/ CGO SoapySDR binding
platform/plutosdr/ Pluto/libiio backend code
rds/ RDS encoder
stereo/ stereo encoder
docs/ docs/
config.sample.json default config
config.plutosdr.json PlutoSDR-specific config
pro-runtime-hardening-workboard.md living workboard for pro runtime hardening
API.md
DSP-CHAIN.md
README.md
config.sample.json
config.plutosdr.json
config.orangepi-pluto-soapy.json
pro-runtime-hardening-workboard.md
scripts/ scripts/
examples/ examples/
``` ```
@@ -103,10 +292,23 @@ examples/
## Planning / workboard ## Planning / workboard


For the current pro-runtime-hardening track, see: For the current pro-runtime-hardening track, see:

- `docs/pro-runtime-hardening-workboard.md` - `docs/pro-runtime-hardening-workboard.md`


This document is the detailed working board for status tracking, confirmed findings, open decisions, verification notes, and implementation progress.
This is the living workboard for:
- status tracking
- confirmed findings
- open technical decisions
- verification notes
- implementation progress

## Release / project docs

Additional project docs:
- `CHANGELOG.md`
- `RELEASE.md`
- `docs/README.md`
- `docs/API.md`
- `docs/DSP-CHAIN.md`


## Legal note ## Legal note




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