[camera] Add pixel buffer

1 year ago · ff482f15f3
2 changed files with 310 additions and 0 deletions
--- a/packages/camera/camera_aurora/lib/camera_data.dart
+++ b/packages/camera/camera_aurora/lib/camera_data.dart
@ -0,0 +1,155 @@
+// SPDX-FileCopyrightText: Copyright 2023 Open Mobile Platform LLC <community@omp.ru>
+// SPDX-License-Identifier: BSD-3-Clause
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:camera_platform_interface/camera_platform_interface.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import 'camera_aurora_method_channel.dart';
+import 'camera_aurora_platform_interface.dart';
+
+class CameraAurora extends CameraPlatform {
+  /// Registers this class as the default instance of [CameraPlatform].
+  static void registerWith() {
+    CameraPlatform.instance = CameraAurora();
+  }
+
+  // The stream for vending frames to platform interface clients.
+  StreamController<CameraImageData>? _frameStreamController;
+
+  /// Completes with a list of available cameras.
+  ///
+  /// This method returns an empty list when no cameras are available.
+  @override
+  Future<List<CameraDescription>> availableCameras() =>
+      CameraAuroraPlatform.instance.availableCameras();
+
+  /// Creates an uninitialized camera instance and returns the cameraId.
+  @override
+  Future<int> createCamera(
+    CameraDescription cameraDescription,
+    ResolutionPreset? resolutionPreset, {
+    bool enableAudio = false,
+  }) {
+    EventChannel(CameraAuroraEvents.cameraAuroraStreamedFrame.name)
+        .receiveBroadcastStream()
+        .listen((event) {
+      debugPrint(event);
+    });
+    return CameraAuroraPlatform.instance.createCamera(cameraDescription.name);
+  }
+
+  /// Initializes the camera on the device.
+  ///
+  /// [imageFormatGroup] is used to specify the image formatting used.
+  /// On Android this defaults to ImageFormat.YUV_420_888 and applies only to the imageStream.
+  /// On iOS this defaults to kCVPixelFormatType_32BGRA.
+  /// On Web this parameter is currently not supported.
+  @override
+  Future<void> initializeCamera(
+    int cameraId, {
+    ImageFormatGroup imageFormatGroup = ImageFormatGroup.unknown,
+  }) async {
+    // init
+  }
+
+  /// Releases the resources of this camera.
+  @override
+  Future<void> dispose(int cameraId) {
+    return CameraAuroraPlatform.instance.dispose(cameraId);
+  }
+
+  /// Captures an image and returns the file where it was saved.
+  @override
+  Future<XFile> takePicture(int cameraId) =>
+      CameraAuroraPlatform.instance.takePicture(cameraId);
+
+  /// Starts a video recording.
+  ///
+  /// The length of the recording can be limited by specifying the [maxVideoDuration].
+  /// By default no maximum duration is specified,
+  /// meaning the recording will continue until manually stopped.
+  /// With [maxVideoDuration] set the video is returned in a [VideoRecordedEvent]
+  /// through the [onVideoRecordedEvent] stream when the set duration is reached.
+  ///
+  /// This method is deprecated in favour of [startVideoCapturing].
+  @override
+  Future<void> startVideoRecording(int cameraId,
+          {Duration? maxVideoDuration}) =>
+      CameraAuroraPlatform.instance.startVideoRecording(cameraId);
+
+  /// Stops the video recording and returns the file where it was saved.
+  @override
+  Future<XFile> stopVideoRecording(int cameraId) =>
+      CameraAuroraPlatform.instance.stopVideoRecording(cameraId);
+
+  /// Pause video recording.
+  @override
+  Future<void> pauseVideoRecording(int cameraId) =>
+      CameraAuroraPlatform.instance.pauseVideoRecording(cameraId);
+
+  /// Resume video recording after pausing.
+  @override
+  Future<void> resumeVideoRecording(int cameraId) =>
+      CameraAuroraPlatform.instance.resumeVideoRecording(cameraId);
+
+  /// The ui orientation changed.
+  ///
+  /// Implementations for this:
+  /// - Should support all 4 orientations.
+  @override
+  Stream<DeviceOrientationChangedEvent> onDeviceOrientationChanged() async* {
+    yield const DeviceOrientationChangedEvent(DeviceOrientation.portraitUp);
+  }
+
+  /// The camera has been initialized.
+  @override
+  Stream<CameraInitializedEvent> onCameraInitialized(int cameraId) async* {
+    yield CameraInitializedEvent(
+      cameraId,
+      // previewWidth
+      400,
+      // previewHeight
+      400,
+      // exposureMode
+      ExposureMode.auto,
+      // exposurePointSupported
+      true,
+      // focusMode
+      FocusMode.auto,
+      // focusPointSupported
+      true,
+    );
+  }
+
+  @override
+  Stream<CameraImageData> onStreamedFrameAvailable(
+    int cameraId, {
+    CameraImageStreamOptions? options,
+  }) {
+    _frameStreamController = StreamController<CameraImageData>(
+      onListen: () =>
+          CameraAuroraPlatform.instance.streamedFrame(cameraId).listen((data) {
+        _frameStreamController!.add(data);
+      }),
+      onPause: () => {},
+      onResume: () => {},
+      onCancel: () => {},
+    );
+    return _frameStreamController!.stream;
+  }
+
+  /// Returns a widget showing a live camera preview.
+  @override
+  Widget buildPreview(int cameraId) {
+    return Center(
+      child: Text(
+        'Camera: $cameraId',
+        style:
+            const TextStyle(fontWeight: FontWeight.bold, color: Colors.white),
+      ),
+    );
+  }
+}
--- a/packages/camera/camera_aurora/lib/camera_viewfinder.dart
+++ b/packages/camera/camera_aurora/lib/camera_viewfinder.dart
@ -0,0 +1,155 @@
+// SPDX-FileCopyrightText: Copyright 2023 Open Mobile Platform LLC <community@omp.ru>
+// SPDX-License-Identifier: BSD-3-Clause
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:camera_platform_interface/camera_platform_interface.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import 'camera_aurora_method_channel.dart';
+import 'camera_aurora_platform_interface.dart';
+
+class CameraAurora extends CameraPlatform {
+  /// Registers this class as the default instance of [CameraPlatform].
+  static void registerWith() {
+    CameraPlatform.instance = CameraAurora();
+  }
+
+  // The stream for vending frames to platform interface clients.
+  StreamController<CameraImageData>? _frameStreamController;
+
+  /// Completes with a list of available cameras.
+  ///
+  /// This method returns an empty list when no cameras are available.
+  @override
+  Future<List<CameraDescription>> availableCameras() =>
+      CameraAuroraPlatform.instance.availableCameras();
+
+  /// Creates an uninitialized camera instance and returns the cameraId.
+  @override
+  Future<int> createCamera(
+    CameraDescription cameraDescription,
+    ResolutionPreset? resolutionPreset, {
+    bool enableAudio = false,
+  }) {
+    EventChannel(CameraAuroraEvents.cameraAuroraStreamedFrame.name)
+        .receiveBroadcastStream()
+        .listen((event) {
+      debugPrint(event);
+    });
+    return CameraAuroraPlatform.instance.createCamera(cameraDescription.name);
+  }
+
+  /// Initializes the camera on the device.
+  ///
+  /// [imageFormatGroup] is used to specify the image formatting used.
+  /// On Android this defaults to ImageFormat.YUV_420_888 and applies only to the imageStream.
+  /// On iOS this defaults to kCVPixelFormatType_32BGRA.
+  /// On Web this parameter is currently not supported.
+  @override
+  Future<void> initializeCamera(
+    int cameraId, {
+    ImageFormatGroup imageFormatGroup = ImageFormatGroup.unknown,
+  }) async {
+    // init
+  }
+
+  /// Releases the resources of this camera.
+  @override
+  Future<void> dispose(int cameraId) {
+    return CameraAuroraPlatform.instance.dispose(cameraId);
+  }
+
+  /// Captures an image and returns the file where it was saved.
+  @override
+  Future<XFile> takePicture(int cameraId) =>
+      CameraAuroraPlatform.instance.takePicture(cameraId);
+
+  /// Starts a video recording.
+  ///
+  /// The length of the recording can be limited by specifying the [maxVideoDuration].
+  /// By default no maximum duration is specified,
+  /// meaning the recording will continue until manually stopped.
+  /// With [maxVideoDuration] set the video is returned in a [VideoRecordedEvent]
+  /// through the [onVideoRecordedEvent] stream when the set duration is reached.
+  ///
+  /// This method is deprecated in favour of [startVideoCapturing].
+  @override
+  Future<void> startVideoRecording(int cameraId,
+          {Duration? maxVideoDuration}) =>
+      CameraAuroraPlatform.instance.startVideoRecording(cameraId);
+
+  /// Stops the video recording and returns the file where it was saved.
+  @override
+  Future<XFile> stopVideoRecording(int cameraId) =>
+      CameraAuroraPlatform.instance.stopVideoRecording(cameraId);
+
+  /// Pause video recording.
+  @override
+  Future<void> pauseVideoRecording(int cameraId) =>
+      CameraAuroraPlatform.instance.pauseVideoRecording(cameraId);
+
+  /// Resume video recording after pausing.
+  @override
+  Future<void> resumeVideoRecording(int cameraId) =>
+      CameraAuroraPlatform.instance.resumeVideoRecording(cameraId);
+
+  /// The ui orientation changed.
+  ///
+  /// Implementations for this:
+  /// - Should support all 4 orientations.
+  @override
+  Stream<DeviceOrientationChangedEvent> onDeviceOrientationChanged() async* {
+    yield const DeviceOrientationChangedEvent(DeviceOrientation.portraitUp);
+  }
+
+  /// The camera has been initialized.
+  @override
+  Stream<CameraInitializedEvent> onCameraInitialized(int cameraId) async* {
+    yield CameraInitializedEvent(
+      cameraId,
+      // previewWidth
+      400,
+      // previewHeight
+      400,
+      // exposureMode
+      ExposureMode.auto,
+      // exposurePointSupported
+      true,
+      // focusMode
+      FocusMode.auto,
+      // focusPointSupported
+      true,
+    );
+  }
+
+  @override
+  Stream<CameraImageData> onStreamedFrameAvailable(
+    int cameraId, {
+    CameraImageStreamOptions? options,
+  }) {
+    _frameStreamController = StreamController<CameraImageData>(
+      onListen: () =>
+          CameraAuroraPlatform.instance.streamedFrame(cameraId).listen((data) {
+        _frameStreamController!.add(data);
+      }),
+      onPause: () => {},
+      onResume: () => {},
+      onCancel: () => {},
+    );
+    return _frameStreamController!.stream;
+  }
+
+  /// Returns a widget showing a live camera preview.
+  @override
+  Widget buildPreview(int cameraId) {
+    return Center(
+      child: Text(
+        'Camera: $cameraId',
+        style:
+            const TextStyle(fontWeight: FontWeight.bold, color: Colors.white),
+      ),
+    );
+  }
+}