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, 49 insertions, 0 deletions

diff --git a/lib/data/data_providers/radio_presets_provider.dart b/lib/data/data_providers/radio_presets_provider.dart
new file mode 100644
index 0000000..9ee68ac
--- /dev/null
+++ b/lib/data/data_providers/radio_presets_provider.dart
@@ -0,0 +1,49 @@
+import 'dart:io';
+import 'package:flutter_ics_homescreen/export.dart';
+import 'package:yaml/yaml.dart';
+
+class RadioPreset {
+  final int frequency;
+  final String name;
+
+  RadioPreset({required this.frequency, required this.name});
+}
+
+class RadioPresets {
+  final List<RadioPreset> fmPresets;
+
+  RadioPresets({required this.fmPresets});
+}
+
+final radioPresetsProvider = Provider((ref) {
+  final presetsFilename = ref.read(appConfigProvider).radioConfig.presets;
+  if (presetsFilename.isEmpty) {
+    return RadioPresets(fmPresets: []);
+  }
+  try {
+    print("Reading radio presets $presetsFilename");
+    var presetsFile = File(presetsFilename);
+    String content = presetsFile.readAsStringSync();
+    final dynamic yamlMap = loadYaml(content);
+
+    List<RadioPreset> presets = [];
+    if (yamlMap.containsKey('fm')) {
+      dynamic list = yamlMap['fm'];
+      if (list is YamlList) {
+        for (var element in list) {
+          if ((element is YamlMap) &&
+              element.containsKey('frequency') &&
+              element.containsKey('name')) {
+            presets.add(RadioPreset(
+                frequency: element['frequency'].toInt(),
+                name: element['name'].toString()));
+          }
+        }
+      }
+    }
+    return RadioPresets(fmPresets: presets);
+  } catch (_) {
+    debugPrint("Exception reading presets!");
+    return RadioPresets(fmPresets: []);
+  }
+});