feat: add random meters in demo

Cargo.lock

@@ -19,9 +19,9 @@ checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
 
 [[package]]
 name = "base64"
-version = "0.22.1"
+version = "0.23.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+checksum = "ac07cdecf99051d9a5238b80f35af32cdeba5b336e55d957b318b50137e18da5"
 
 [[package]]
 name = "bitflags"
@@ -60,6 +60,17 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "chacha20"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65c35e4b699c7e15ccbe7ee35c005e4fc0a278d22238a2857e6ce2dadeda1b06"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "rand_core",
+]
+
 [[package]]
 name = "chrono"
 version = "0.4.45"
@@ -79,10 +90,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
 [[package]]
-name = "darling"
+name = "cpufeatures"
-version = "0.23.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ae13da2f202d56bd7f91c25fba009e7717a1e4a1cc98a76d844b65ae912e9d"
+checksum = "5ca28b0ae3115b884660db4118d803791fd6756b6e88f39c0f3f7859060d7566"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "darling"
+version = "0.24.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed17f5901b6630b993ca003def43f2f8ef4014fc13b047b57aad617ff32bc2ec"
 dependencies = [
  "darling_core",
  "darling_macro",
@@ -90,26 +110,26 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.23.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9865a50f7c335f53564bb694ef660825eb8610e0a53d3e11bf1b0d3df31e03b0"
+checksum = "6837e2cf7485aaae18f86181d2f0e9a7ed297a025e220aeabf63fdebd3a2ddff"
 dependencies = [
  "ident_case",
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.119",
+ "syn 3.0.6",
 ]
 
 [[package]]
 name = "darling_macro"
-version = "0.23.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3984ec7bd6cfa798e62b4a642426a5be0e68f9401cfc2a01e3fa9ea2fcdb8d"
+checksum = "2ac7135c3ef02b2f7833bbeb1be5ba7f966dcde8a87c6b87f65a778d71a02785"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.119",
+ "syn 3.0.6",
 ]
 
 [[package]]
@@ -163,6 +183,7 @@ name = "dsp_thomann"
 version = "0.1.0"
 dependencies = [
  "dotenvy",
+ "rand",
  "serde",
  "serde_json",
  "serde_with",
@@ -213,6 +234,18 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "300e883d756b2e4ec94e02791f39b04b522276138852cfc41d9fb7e904106099"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "rand_core",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -445,6 +478,29 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "r-efi"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
+
+[[package]]
+name = "rand"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65c9fb96cbc91e3478eaae79a69fcd3f1ae4ad052e471fe6732fff548984b4af"
+dependencies = [
+ "chacha20",
+ "getrandom",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63b8176103e19a2643978565ca18b50549f6101881c443590420e4dc998a3c69"
+
 [[package]]
 name = "ref-cast"
 version = "1.0.27"
@@ -462,7 +518,7 @@ checksum = "92ecd8964f8453721699a1ed72037b0db49ce2f5a5138486ee89bed6f67cdf3a"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 3.0.2",
+ "syn 3.0.6",
 ]
 
 [[package]]
@@ -522,7 +578,7 @@ checksum = "e7a5d71263a5a7d47b41f6b3f06ba276f10cc18b0931f1799f710578e2309348"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 3.0.2",
+ "syn 3.0.6",
 ]
 
 [[package]]
@@ -540,9 +596,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.22.0"
+version = "3.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee78f1fbe43ac4a0e47aadb3dbd357b69eb0d3793e948624cd03dd2750ab1c0a"
+checksum = "df9adc193c780ef8f159aee8b61e2d5801aaa555e6eb0947fe45530ec506296f"
 dependencies = [
  "base64",
  "bs58",
@@ -561,14 +617,14 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.22.0"
+version = "3.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8705578779c2b6bd90d84d66eb2e206b708b1a4d7b9f17641b293545bf1c7e46"
+checksum = "3e17bbc68e28663bbbb90df47e058aa7eda4fb445b89fe70457bb94fbccf6e49"
 dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.119",
+ "syn 3.0.6",
 ]
 
 [[package]]
@@ -620,9 +676,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "3.0.2"
+version = "3.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a207d6d6a2b7fc470b80443726053f18a2481b7e1eee970597051596567987a3"
+checksum = "8593e8e72159ed2257d083c7a454a85cbf854f37a0966d8d483aff8c8a3ebcee"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -631,22 +687,22 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "2.0.20"
+version = "2.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec86235f5fcc2a73650310756d2ac5b138a5780bbbdfae3eeccec992c435ba4f"
+checksum = "09e52cb86a36cede5cb101bf8908837b3e4c6e5e59fe7fd85c23fb56200d189e"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "2.0.20"
+version = "2.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc04cd3e1236dd4a98afca4569f2deb3f120e5422a4023be2cb683f8486292af"
+checksum = "fe5197923287db20a58125f0bc85c062f7f2c892de97b18c356f9efb14b28524"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 3.0.2",
+ "syn 3.0.6",
 ]
 
 [[package]]
@@ -732,7 +788,7 @@ dependencies = [
  "bumpalo",
  "proc-macro2",
  "quote",
- "syn 3.0.2",
+ "syn 3.0.6",
  "wasm-bindgen-shared",
 ]
 

Cargo.toml

@@ -7,12 +7,13 @@ edition = "2024"
 dotenvy = "0.15"
 
 [dependencies]
-thiserror = "2.0.20"
+thiserror = "2.0.21"
 strum = "0.28.0"
 strum_macros = "0.28.0"
 serde = { version = "1", features = ["derive"], optional = true }
 serde_json = { version = "1", optional = true }
-serde_with = "3"
+serde_with = "3.24.0"
+rand = "0.10.3"
 
 [lib]
 name = "dsp_thomann"

dsp408-protocol.md

@@ -617,26 +617,81 @@ delay = delay_min + (raw / 255) × (delay_max - delay_min)
 
 | Field | Value |
 |---|---|
-| **Purpose** | Per-channel level + peak metering |
+| **Purpose** | Per-channel RMS + peak metering, with clip flags |
-| **Size** | 3 bytes per channel |
+| **Payload size** | 38 bytes (exactly; any other length is an error) |
-| **Total** | 12 channels × 3 bytes = 36 bytes |
+| **Layout** | 12 channels × 3 bytes = 36 bytes, followed by 2 clip-flag bytes |
+| **Channel order** | Channels 0–3 are inputs, channels 4–11 are outputs, each mapped in enum order |
+
+#### Channel record (3 bytes, at offset `i = channel × 3`)
 
 | Byte offset | Field | Format |
 |---|---|---|
-| 0–1 | Level | IEEE754 float16, little-endian |
+| `i + 0` | RMS low byte | Low byte of the RMS float16 |
-| 2 | Peak | 1-byte peak value (format not specified in source) |
+| `i + 1` | Shared high byte | High byte of **both** the RMS and Peak float16s |
+| `i + 2` | Peak low byte | Low byte of the Peak float16 |
+
+Both values are IEEE 754 half-precision floats (little-endian pairs). The peak is not a separate 1-byte value: it reuses byte `i + 1` as its high byte, so its byte order is reversed relative to the offset order.
 
-**Encoding (value → raw):**
 ```text
-level_bytes = float16_encode(level)   // 2 bytes, little-endian
+rms_raw  = float16_decode(lo = payload[i],     hi = payload[i + 1])
-peak_byte   = peak_encode(peak)       // format undefined — see note below
+peak_raw = float16_decode(lo = payload[i + 2], hi = payload[i + 1])
-raw = level_bytes + peak_byte
 ```
 
-**Decoding (raw → value):**
+If a float16 fails to decode, the raw value defaults to `0.0`, which converts to `MIN_DB` (-60 dB).
+
+#### Clip flags (bytes 36–37)
+
+| Channel index | Flag location |
+|---|---|
+| 0–3 | `payload[36]`, bit `index` |
+| 4–11 | `payload[37]`, bit `index - 4` |
+
 ```text
-level = float16_decode(raw[0:2])      // little-endian
+clip = (flags_byte & (1 << bit)) != 0
-peak  = peak_decode(raw[2])           // format undefined — see note below
+```
+
+#### Raw → dB conversion
+
+Raw values are converted with a piecewise-linear curve, then clamped.
+
+| Constant | Value | Meaning |
+|---|---|---|
+| `X0` | -25.0 dB | Breakpoint |
+| `Y0` | 1.0 | Raw value at the breakpoint |
+| `K1` | 0.0104 | Raw units per dB below the breakpoint (`raw < Y0`) |
+| `K2` | 0.0208 | Raw units per dB above the breakpoint (`raw >= Y0`) |
+| `MIN_DB` | -60.0 dB | Lower clamp |
+| `MAX_DB` | 12.0 dB | Upper clamp |
+
+**Decoding (raw → dB):**
+```text
+if raw < Y0:  db = X0 + (raw - Y0) / K1
+else:         db = X0 + (raw - Y0) / K2
+db = clamp(db, MIN_DB, MAX_DB)
+```
+
+**Encoding (dB → raw):** the inverse of the above. Values outside the clamp range are not recoverable.
+```text
+db = clamp(db, MIN_DB, MAX_DB)
+if db < X0:   raw = Y0 + (db - X0) * K1
+else:         raw = Y0 + (db - X0) * K2
+```
+
+#### Full decode
+
+```text
+require len(payload) == 38
+
+for index in 0..11:
+    i        = index * 3
+    rms_db   = raw_to_db(float16_decode(payload[i],     payload[i + 1]))
+    peak_db  = raw_to_db(float16_decode(payload[i + 2], payload[i + 1]))
+    clip     = index < 4 ? payload[36] bit index
+                         : payload[37] bit (index - 4)
+    meter[index] = { rms: rms_db, peak: peak_db, clip }
+
+inputs  = meter[0..3]   → InputChannel enum order
+outputs = meter[4..11]  → OutputChannel enum order
 ```
 
 ---

src/dsp408/client/default.rs

@@ -1,8 +1,9 @@
 use std::collections::HashMap;
 use strum::IntoEnumIterator;
+use rand::RngExt;
 
 use crate::dsp408::types::ConnectionStatus;
-use super::types::{
+use crate::dsp408::types::{
     Compressor, Crossover, CrossoverFilter, CrossoverFilters, DSPConfigState, DSPState, DelayUnit,
     DeviceFlags, DiscreteFrequency, Gate, GraphicEQ, InputChannel, InputChannelState, InputMeters,
     InputSource, InputType, Limiter, MatrixRoutes, Meter, OutputChannel, OutputChannelState,
@@ -301,3 +302,32 @@ fn default_meter() -> Meter {
         clip: false,
     }
 }
+
+fn random_meter() -> Meter {
+    let mut rng = rand::rng();
+
+    let rms = rng.random_range(-60.0..=0.0);
+    let peak = (rms + rng.random_range(0.0..=12.0) as f32).min(12.0);
+
+    Meter {
+        rms,
+        peak,
+        clip: peak > 0.0,
+    }
+}
+
+pub fn random_input_meters() -> InputMeters {
+    InputMeters {
+        meters: InputChannel::iter()
+            .map(|channel| (channel, random_meter()))
+            .collect(),
+    }
+}
+
+pub fn random_output_meters() -> OutputMeters {
+    OutputMeters {
+        meters: OutputChannel::iter()
+            .map(|channel| (channel, random_meter()))
+            .collect(),
+    }
+}

src/dsp408/client/dsp408.rs

@@ -8,17 +8,12 @@ use std::{
 };
 
 use crate::{
-    common::errors::DSPError,
+    common::errors::DSPError, dsp408::{
-    dsp408::{
+        client::default::{default_dsp_state, default_input_meters, default_output_meters, random_input_meters, random_output_meters}, mapper::{
-        default::{default_input_meters, default_output_meters},
-        default_dsp_state,
-        mapper::{
             self,
             constants::{CONFIG_CHUNK_INDEX_MAX, PRESET_INDEX_MAX, delay_range},
             response::map_response,
-        },
+        }, protocol::{commands, config::decode_config, frame::extract_frame}, types::{self, ConnectionStatus::Disconnected, DSPMode},
-        protocol::{commands, config::decode_config, frame::extract_frame},
-        types::{self, ConnectionStatus::Disconnected, DSPMode},
     },
 };
 
@@ -1796,7 +1791,13 @@ impl DSP408 {
         match self.state.connection {
             types::ConnectionStatus::Connected => {
                 if self.mode == types::DSPMode::Demo {
-                    return Ok((self.input_meters.clone(), self.output_meters.clone()));
+                    self.input_meters = random_input_meters();
+                    self.output_meters = random_output_meters();
+
+                    return Ok((
+                        self.input_meters.clone(),
+                        self.output_meters.clone(),
+                    ));
                 }
 
                 let request = commands::build_get_meter_levels();

src/dsp408/client/mod.rs

@@ -1,2 +1,4 @@
 mod dsp408;
+mod default;
+
 pub use dsp408::DSP408;

src/dsp408/mod.rs

@@ -1,9 +1,7 @@
 mod client;
-mod default;
 mod mapper;
 mod protocol;
 
 pub mod types;
 
 pub use client::DSP408;
-pub(crate) use default::default_dsp_state;