Simulcast, Screen sharing & Various improvements (#4)

* Respect `RTCIceTransportPolicy` enum and organize * Simplify syntax where possible etc. * Combine `VideoPreset` and `VideoPresets` * Default values for `ConnectOptions` * Build URI instead of String manipulation * Slight modifications to Exception * `LiveKitTheme` for example * `VideoEncoding` class * Organize imports * First simulcast implementation * Remove unnecessary try-catches * Update Android settings * Remember uri and token * example improvements * `fit` parameter for VideoTrackRenderer * Simulcast option for example * Pass `defaultPublishOptions` * Show only `VideoQuality` * Pass tests * Better buildUri logic * Named parameter to positional * Explicit imports * `VideoParameter` instead of `VideoPreset` * Use `mediaTrack.getSettings` when possible * Safer dispose logic * Safer `PCTransport` Update transport.dart * Synchronized events for `SignalClient` * Use logger instead of print * Make example compile for iOS * First screen share implementation * Make example work with screen share * Example improvement * Code optimization * Don't depend on web_socket_channel * Fix: Unpublish track bug * Show participant mute state & identity * Update protos * Remote mute/unmute * iOS Background mode * Separate `createCameraTrack` and `createScreenTrack` * Clean up * PB fix * format * Fix analyzer warning * Android clean up * Update README.md * Clean up
2021-09-11 03:14:14 +09:00
parent 8e66e324f6
commit 50f56c5e1e
69 changed files with 2653 additions and 2351 deletions
@@ -0,0 +1,87 @@
+//
+//
+//
+
+import 'package:flutter_webrtc/flutter_webrtc.dart';
+
+import 'options.dart';
+import 'track/options.dart';
+
+class Utils {
+  static List<VideoParameters> _presetsForResolution(
+    int width,
+    int height,
+  ) {
+    final double aspect = width / height;
+    if ((aspect - 16.0 / 9.0).abs() < (aspect - 4.0 / 3.0).abs()) return VideoParameters.presets169;
+    return VideoParameters.presets43;
+  }
+
+  static VideoParameters _findPresetForResolution(
+    int width,
+    int height, {
+    required List<VideoParameters> presets,
+  }) {
+    assert(presets.isNotEmpty, 'presets should not be empty');
+    VideoParameters result = presets.first;
+    for (final preset in presets) {
+      if (width >= preset.width && height >= preset.height) result = preset;
+    }
+
+    return result;
+  }
+
+  static List<RTCRtpEncoding>? computeVideoEncodings({
+    int? width,
+    int? height,
+    TrackPublishOptions? options,
+  }) {
+    options ??= const TrackPublishOptions();
+
+    VideoEncoding? videoEncoding = options.videoEncoding;
+
+    if ((videoEncoding == null && !options.simulcast) || width == null || height == null) {
+      // don't set encoding when we are not simulcasting and user isn't restricting
+      // encoding parameters
+      return null;
+    }
+
+    final presets = _presetsForResolution(width, height);
+
+    if (videoEncoding == null) {
+      // find the right encoding based on width/height
+      final preset = _findPresetForResolution(width, height, presets: presets);
+      // print('Using preset: ${preset.id}');
+      videoEncoding = preset.encoding;
+      //   log.debug('using video encoding', videoEncoding);
+    }
+
+    // Not simulcast
+    if (!options.simulcast) return [videoEncoding.toRTCRtpEncoding()];
+
+    // Compute for simulcast
+    final midPreset = presets[1];
+    final lowPreset = presets[0];
+    return [
+      videoEncoding.toRTCRtpEncoding(
+        rid: 'f',
+      ),
+      // if resolution is high enough, we would send both h and q res..
+      // otherwise only send h
+      if (height * 0.7 >= midPreset.height) ...[
+        midPreset.encoding.toRTCRtpEncoding(
+          rid: 'h',
+          scaleResolutionDownBy: height / midPreset.height,
+        ),
+        lowPreset.encoding.toRTCRtpEncoding(
+          rid: 'q',
+          scaleResolutionDownBy: height / lowPreset.height,
+        ),
+      ] else
+        lowPreset.encoding.toRTCRtpEncoding(
+          rid: 'h',
+          scaleResolutionDownBy: height / lowPreset.height,
+        ),
+    ];
+  }
+}