Initial radio implementation

Notable changes:
- Add radio gRPC API protobuf definitation and generated files.
- Reworked existing single gRPC APIs library to split it into
  per-API libraries to avoid name collision issues.
- Add radio gRPC client class and associated radio state class
  and RiverPod providers.
- Split media controls and play list table classes into media
  player and radio specific versions to facilitate customization
  and wiring up their appropriate backends in a straightforward
  fashion.  Some potential rationalization of styling widgets
  may be done as a follow up to avoid some duplication.
- Added radio configuration and presets loading.  The presets
  will be populated with the contents of a radio-presets.yaml
  file from the configured location, the default location is
  the /etc/xdg/AGL/ics-homescreen directory.
- Implemented FM radio player against the radio gRPC API.
  For the sake of expediency, no attempt has been made to make
  the player able to handle AM band support.
- Reworked media page navigation state so that active player is
  restored when coming back to the page.  Logic has been added to
  start/stop the radio on navigating to or leaving the FM radio
  sub-page.  This will potentially be reworked before CES to work
  with the pause/stop button present on the other pages.
- Started pruning down global exports.dart a bit to remove files
  only used in a specific page/hierarchy, starting with media.

Bug-AGL: SPEC-5029

Change-Id: I1ae0aca4a7a8218e69e4286c863f01509a1cccb7
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/lib/data/models/audio_state.dart b/lib/data/models/audio_state.dart
new file mode 100644
index 0000000..cfa550b
--- /dev/null
+++ b/lib/data/models/audio_state.dart
@@ -0,0 +1,93 @@
+import 'dart:convert';
+
+import 'package:flutter_ics_homescreen/export.dart';
+
+@immutable
+class AudioState {
+  final double volume;
+  final double balance;
+  final double fade;
+  final double treble;
+  final double bass;
+  const AudioState({
+    required this.volume,
+    required this.balance,
+    required this.fade,
+    required this.treble,
+    required this.bass,
+  });
+
+  const AudioState.initial()
+      : volume = 5.0,
+        balance = 5.0,
+        fade = 5.0,
+        treble = 5.0,
+        bass = 5.0;
+
+  AudioState copyWith({
+    double? volume,
+    double? balance,
+    double? fade,
+    double? treble,
+    double? bass,
+  }) {
+    return AudioState(
+      volume: volume ?? this.volume,
+      balance: balance ?? this.balance,
+      fade: fade ?? this.fade,
+      treble: treble ?? this.treble,
+      bass: bass ?? this.bass,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'volume': volume,
+      'balance': balance,
+      'fade': fade,
+      'treble': treble,
+      'bass': bass,
+    };
+  }
+
+  factory AudioState.fromMap(Map<String, dynamic> map) {
+    return AudioState(
+      volume: map['volume']?.toDouble() ?? 0.0,
+      balance: map['balance']?.toDouble() ?? 0.0,
+      fade: map['fade']?.toDouble() ?? 0.0,
+      treble: map['treble']?.toDouble() ?? 0.0,
+      bass: map['bass']?.toDouble() ?? 0.0,
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory AudioState.fromJson(String source) =>
+      AudioState.fromMap(json.decode(source));
+
+  @override
+  String toString() {
+    return 'AudioState(volume: $volume, balance: $balance, fade: $fade, treble: $treble, bass: $bass)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is AudioState &&
+        other.volume == volume &&
+        other.balance == balance &&
+        other.fade == fade &&
+        other.treble == treble &&
+        other.bass == bass;
+  }
+
+  @override
+  int get hashCode {
+    return volume.hashCode ^
+        balance.hashCode ^
+        fade.hashCode ^
+        treble.hashCode ^
+        bass.hashCode;
+  }
+}