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Add LPCNet voice mode support

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Janez T
2026-03-11 21:16:08 +01:00
parent 1b6ff59af3
commit ca872f2049
15 changed files with 329 additions and 124 deletions
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93
lib/utils/voice_message_parser.dart
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@@ -11,20 +11,43 @@ const int _defaultLoRaCrcEnabled = 1;
const int _defaultLoRaExplicitHeader = 1;
const double _defaultAirtimeBudgetFactor = 1.0; // one half duty-cycle
/// Identifies which Codec2 mode was used for a voice packet.
/// Matches the modeId byte in the text/binary packet header.
enum VoicePacketMode {
mode700c(0, '700C'),
mode1200(1, '1200'),
mode2400(2, '2400'),
mode1300(3, '1300'),
mode1400(4, '1400'),
mode1600(5, '1600'),
mode3200(6, '3200');
enum VoiceCodecKind {
codec2(0, 'Codec2'),
lpcnet(1, 'LPCNet');
const VoicePacketMode(this.id, this.label);
const VoiceCodecKind(this.id, this.label);
final int id;
final String label;
}
/// Identifies which voice codec/mode was used for a packet.
/// Matches the modeId byte in the text/binary packet header.
enum VoicePacketMode {
mode700c(0, '700C', VoiceCodecKind.codec2, 8000, 100, 1600),
mode1200(1, '1200', VoiceCodecKind.codec2, 8000, 150, 1040),
mode2400(2, '2400', VoiceCodecKind.codec2, 8000, 300, 520),
mode1300(3, '1300', VoiceCodecKind.codec2, 8000, 175, 880),
mode1400(4, '1400', VoiceCodecKind.codec2, 8000, 175, 880),
mode1600(5, '1600', VoiceCodecKind.codec2, 8000, 200, 800),
mode3200(6, '3200', VoiceCodecKind.codec2, 8000, 400, 400),
lpcnet1600(7, 'LPCNet', VoiceCodecKind.lpcnet, 16000, 200, 40);
const VoicePacketMode(
this.id,
this.label,
this.codec,
this.sampleRateHz,
this.bytesPerSecond,
this.packetDurationMs,
);
final int id;
final String label;
final VoiceCodecKind codec;
final int sampleRateHz;
final int bytesPerSecond;
final int packetDurationMs;
int get samplesPerPacket => sampleRateHz * packetDurationMs ~/ 1000;
static VoicePacketMode fromId(int id) => VoicePacketMode.values.firstWhere(
(m) => m.id == id,
@@ -153,23 +176,15 @@ class VoicePacket {
/// Estimated audio duration of this packet in milliseconds.
int get durationMs {
// bytesPerSecond for each mode
final bps = switch (mode) {
VoicePacketMode.mode700c => 100,
VoicePacketMode.mode1200 => 150,
VoicePacketMode.mode1300 => 175,
VoicePacketMode.mode1400 => 175,
VoicePacketMode.mode1600 => 200,
VoicePacketMode.mode2400 => 300,
VoicePacketMode.mode3200 => 400,
};
if (bps == 0) return 0;
return (codec2Data.length * 1000 ~/ bps).clamp(0, 1500);
if (mode.bytesPerSecond == 0) return 0;
return (codec2Data.length * 1000 ~/ mode.bytesPerSecond).clamp(0, 1500);
}
@override
String toString() {
final suffix = total > 0 ? ' ${mode.label} [$index/${total - 1}]' : ' [$index]';
final suffix = total > 0
? ' ${mode.label} [$index/${total - 1}]'
: ' [$index]';
return 'VoicePacket($sessionId$suffix ${codec2Data.length}B)';
}
}
@@ -242,13 +257,7 @@ class VoiceEnvelope {
}
int voiceModeBytesPerSecond(VoicePacketMode mode) => switch (mode) {
VoicePacketMode.mode700c => 100,
VoicePacketMode.mode1200 => 150,
VoicePacketMode.mode1300 => 175,
VoicePacketMode.mode1400 => 175,
VoicePacketMode.mode1600 => 200,
VoicePacketMode.mode2400 => 300,
VoicePacketMode.mode3200 => 400,
_ => mode.bytesPerSecond,
};
/// Approximate end-to-end transmit time for a voice session over MeshCore LoRa.
@@ -419,8 +428,7 @@ class VoiceFetchRequest {
this.version = 3,
});
static bool isVoiceFetchRequestText(String text) =>
text.startsWith(_prefix);
static bool isVoiceFetchRequestText(String text) => text.startsWith(_prefix);
static bool isVoiceFetchRequestBinary(Uint8List payload) =>
payload.isNotEmpty && payload[0] == _binaryMagic;
@@ -473,9 +481,7 @@ class VoiceFetchRequest {
final requesterKey6 = parts[2];
final normalizedWant = wantToken == 'a'
? 'all'
: ((wantToken.startsWith('m'))
? 'missing'
: wantToken);
: ((wantToken.startsWith('m')) ? 'missing' : wantToken);
if (sid == null) {
return null;
@@ -602,7 +608,11 @@ String _toBase36(int value) => value.toRadixString(36);
String _encodeSessionId(String sessionIdHex) {
if (!RegExp(r'^[0-9a-fA-F]{8}$').hasMatch(sessionIdHex)) {
throw ArgumentError.value(sessionIdHex, 'sessionIdHex', 'Expected 8 hex chars');
throw ArgumentError.value(
sessionIdHex,
'sessionIdHex',
'Expected 8 hex chars',
);
}
final value = int.parse(sessionIdHex, radix: 16);
return value.toRadixString(36);
@@ -616,10 +626,7 @@ String? _decodeSessionId(String token) {
}
String _encodeMissingIndicesCompact(List<int> indices) {
final sorted = indices
.where((v) => v >= 0 && v <= 254)
.toSet()
.toList()
final sorted = indices.where((v) => v >= 0 && v <= 254).toSet().toList()
..sort();
if (sorted.isEmpty) return '';
final chunks = <String>[];
@@ -632,7 +639,9 @@ String _encodeMissingIndicesCompact(List<int> indices) {
continue;
}
chunks.add(
start == prev ? _toBase36(start) : '${_toBase36(start)}-${_toBase36(prev)}',
start == prev
? _toBase36(start)
: '${_toBase36(start)}-${_toBase36(prev)}',
);
start = curr;
prev = curr;