Add support for YUV_420_888 Image format.

Casting the bytes to a type directly is not possible, thus allocating
a new texture is necessary (and costly).

But on the bright side, we avoid the conversion inside the camera
plugin [0].

[0] https://github.com/flutter/packages/blob/d1fd6232ec33cd5a25aa762e605c494afced812f/packages/camera/camera_android/android/src/main/java/io/flutter/plugins/camera/media/ImageStreamReaderUtils.java#L35

Author: panmari

packages/example/lib/vision_detector_views/camera_view.dart

@@ -358,27 +358,52 @@ class _CameraViewState extends State<CameraView> {
 
     // get image format
     final format = InputImageFormatValue.fromRawValue(image.format.raw);
-    // validate format depending on platform
-    // only supported formats:
-    // * nv21 for Android
-    // * bgra8888 for iOS
-    if (format == null ||
-        (Platform.isAndroid && format != InputImageFormat.nv21) ||
-        (Platform.isIOS && format != InputImageFormat.bgra8888)) return null;
+    if (format == null) {
+      print('could not find format from raw value: $image.format.raw');
+      return null;
+    }
+    // Validate format depending on platform
+    final androidSupportedFormats = [
+      InputImageFormat.nv21,
+      InputImageFormat.yv12,
+      InputImageFormat.yuv_420_888
+    ];
+    if ((Platform.isAndroid && androidSupportedFormats.contains(format)) ||
+        (Platform.isIOS && format != InputImageFormat.bgra8888)) {
+      print('image format is not supported: $format');
+      return null;
+    }
 
-    // since format is constraint to nv21 or bgra8888, both only have one plane
-    if (image.planes.length != 1) return null;
-    final plane = image.planes.first;
+    // Compile a flat list of all image data. For image formats with multiple planes,
+    // takes some copying.
+    final Uint8List bytes = image.planes.length == 1
+        ? image.planes.first.bytes
+        : _concatenatePlanes(image);
 
     // compose InputImage using bytes
     return InputImage.fromBytes(
-      bytes: plane.bytes,
+      bytes: bytes,
       metadata: InputImageMetadata(
         size: Size(image.width.toDouble(), image.height.toDouble()),
         rotation: rotation, // used only in Android
-        format: format, // used only in iOS
-        bytesPerRow: plane.bytesPerRow, // used only in iOS
+        format: format,
+        bytesPerRow: image.planes.first.bytesPerRow, // used only in iOS
       ),
     );
   }
+
+  Uint8List _concatenatePlanes(CameraImage image) {
+    int length = 0;
+    for (final Plane p in image.planes) {
+      length += p.bytes.length;
+    }
+
+    final Uint8List bytes = Uint8List(length);
+    int offset = 0;
+    for (final Plane p in image.planes) {
+      bytes.setRange(offset, offset + p.bytes.length, p.bytes);
+      offset += p.bytes.length;
+    }
+    return bytes;
+  }
 }

packages/example/pubspec.lock

@@ -25,38 +25,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.11.0+2"
-  camera_android:
-    dependency: "direct main"
-    description:
-      name: camera_android
-      sha256: "19b7226387218864cb2388e1ad5db7db50d065222f5511254b03fc397dd21a5e"
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.10.9+17"
   camera_android_camerax:
     dependency: transitive
     description:
       name: camera_android_camerax
-      sha256: "2bb0724371bae3c0889d7e0b1665357e4aa6ba6c8d32ffa3e178098ba81ed3df"
+      sha256: ecadc214daed34d8503540525d26577731c066f1993c254aa5272da7629e8f10
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.11"
+    version: "0.6.12"
   camera_avfoundation:
     dependency: transitive
     description:
       name: camera_avfoundation
-      sha256: "7c28969a975a7eb2349bc2cb2dfe3ad218a33dba9968ecfb181ce08c87486655"
+      sha256: c3038e6e72e284b14ad246a419f26908c08f8886d114cb8a2e351988439bfa68
       url: "https://pub.dev"
     source: hosted
-    version: "0.9.17+3"
+    version: "0.9.17+6"
   camera_platform_interface:
     dependency: transitive
     description:
       name: camera_platform_interface
-      sha256: b3ede1f171532e0d83111fe0980b46d17f1aa9788a07a2fbed07366bbdbb9061
+      sha256: "953e7baed3a7c8fae92f7200afeb2be503ff1a17c3b4e4ed7b76f008c2810a31"
       url: "https://pub.dev"
     source: hosted
-    version: "2.8.0"
+    version: "2.9.0"
   camera_web:
     dependency: transitive
     description:
@@ -117,10 +109,10 @@ packages:
     dependency: transitive
     description:
       name: file_selector_linux
-      sha256: "712ce7fab537ba532c8febdb1a8f167b32441e74acd68c3ccb2e36dcb52c4ab2"
+      sha256: "54cbbd957e1156d29548c7d9b9ec0c0ebb6de0a90452198683a7d23aed617a33"
       url: "https://pub.dev"
     source: hosted
-    version: "0.9.3"
+    version: "0.9.3+2"
   file_selector_macos:
     dependency: transitive
     description:
@@ -162,18 +154,18 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_pdfview
-      sha256: "6b625b32a9102780236554dff42f2d798b4627704ab4a3153c07f2134a52b697"
+      sha256: "2e3fa359524e9865ec25a64593b65092b4a9974c5871228c1a771300a003d150"
       url: "https://pub.dev"
     source: hosted
-    version: "1.3.3"
+    version: "1.4.0"
   flutter_plugin_android_lifecycle:
     dependency: transitive
     description:
       name: flutter_plugin_android_lifecycle
-      sha256: "9b78450b89f059e96c9ebb355fa6b3df1d6b330436e0b885fb49594c41721398"
+      sha256: "615a505aef59b151b46bbeef55b36ce2b6ed299d160c51d84281946f0aa0ce0e"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.23"
+    version: "2.0.24"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -308,10 +300,10 @@ packages:
     dependency: transitive
     description:
       name: http_parser
-      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      sha256: "178d74305e7866013777bab2c3d8726205dc5a4dd935297175b19a23a2e66571"
       url: "https://pub.dev"
     source: hosted
-    version: "4.0.2"
+    version: "4.1.2"
   image_picker:
     dependency: "direct main"
     description:
@@ -324,26 +316,26 @@ packages:
     dependency: transitive
     description:
       name: image_picker_android
-      sha256: d3e5e00fdfeca8fd4ffb3227001264d449cc8950414c2ff70b0e06b9c628e643
+      sha256: b62d34a506e12bb965e824b6db4fbf709ee4589cf5d3e99b45ab2287b008ee0c
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.12+15"
+    version: "0.8.12+20"
   image_picker_for_web:
     dependency: transitive
     description:
       name: image_picker_for_web
-      sha256: "65d94623e15372c5c51bebbcb820848d7bcb323836e12dfdba60b5d3a8b39e50"
+      sha256: "717eb042ab08c40767684327be06a5d8dbb341fe791d514e4b92c7bbe1b7bb83"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.5"
+    version: "3.0.6"
   image_picker_ios:
     dependency: transitive
     description:
       name: image_picker_ios
-      sha256: "6703696ad49f5c3c8356d576d7ace84d1faf459afb07accbb0fae780753ff447"
+      sha256: "05da758e67bc7839e886b3959848aa6b44ff123ab4b28f67891008afe8ef9100"
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.12"
+    version: "0.8.12+2"
   image_picker_linux:
     dependency: transitive
     description:
@@ -364,10 +356,10 @@ packages:
     dependency: transitive
     description:
       name: image_picker_platform_interface
-      sha256: "9ec26d410ff46f483c5519c29c02ef0e02e13a543f882b152d4bfd2f06802f80"
+      sha256: "886d57f0be73c4b140004e78b9f28a8914a09e50c2d816bdd0520051a71236a0"
       url: "https://pub.dev"
     source: hosted
-    version: "2.10.0"
+    version: "2.10.1"
   image_picker_windows:
     dependency: transitive
     description:
@@ -404,10 +396,10 @@ packages:
     dependency: transitive
     description:
       name: lints
-      sha256: "3315600f3fb3b135be672bf4a178c55f274bebe368325ae18462c89ac1e3b413"
+      sha256: c35bb79562d980e9a453fc715854e1ed39e24e7d0297a880ef54e17f9874a9d7
       url: "https://pub.dev"
     source: hosted
-    version: "5.0.0"
+    version: "5.1.1"
   matcher:
     dependency: transitive
     description:
@@ -436,10 +428,10 @@ packages:
     dependency: transitive
     description:
       name: mime
-      sha256: "801fd0b26f14a4a58ccb09d5892c3fbdeff209594300a542492cf13fba9d247a"
+      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.6"
+    version: "2.0.0"
   path:
     dependency: "direct main"
     description:
@@ -452,26 +444,26 @@ packages:
     dependency: "direct main"
     description:
       name: path_provider
-      sha256: fec0d61223fba3154d87759e3cc27fe2c8dc498f6386c6d6fc80d1afdd1bf378
+      sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.4"
+    version: "2.1.5"
   path_provider_android:
     dependency: transitive
     description:
       name: path_provider_android
-      sha256: c464428172cb986b758c6d1724c603097febb8fb855aa265aeecc9280c294d4a
+      sha256: "4adf4fd5423ec60a29506c76581bc05854c55e3a0b72d35bb28d661c9686edf2"
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.12"
+    version: "2.2.15"
   path_provider_foundation:
     dependency: transitive
     description:
       name: path_provider_foundation
-      sha256: f234384a3fdd67f989b4d54a5d73ca2a6c422fa55ae694381ae0f4375cd1ea16
+      sha256: "4843174df4d288f5e29185bd6e72a6fbdf5a4a4602717eed565497429f179942"
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.0"
+    version: "2.4.1"
   path_provider_linux:
     dependency: transitive
     description:
@@ -500,10 +492,10 @@ packages:
     dependency: transitive
     description:
       name: platform
-      sha256: "9b71283fc13df574056616011fb138fd3b793ea47cc509c189a6c3fa5f8a1a65"
+      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
       url: "https://pub.dev"
     source: hosted
-    version: "3.1.5"
+    version: "3.1.6"
   plugin_platform_interface:
     dependency: transitive
     description:
@@ -545,10 +537,10 @@ packages:
     dependency: transitive
     description:
       name: stream_transform
-      sha256: "14a00e794c7c11aa145a170587321aedce29769c08d7f58b1d141da75e3b1c6f"
+      sha256: ad47125e588cfd37a9a7f86c7d6356dde8dfe89d071d293f80ca9e9273a33871
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   string_scanner:
     dependency: transitive
     description:
@@ -577,10 +569,10 @@ packages:
     dependency: transitive
     description:
       name: typed_data
-      sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
       url: "https://pub.dev"
     source: hosted
-    version: "1.3.2"
+    version: "1.4.0"
   vector_math:
     dependency: transitive
     description:

packages/example/pubspec.yaml

@@ -16,8 +16,6 @@ dependencies:
   flutter_pdfview: ^1.3.3
   image_picker: ^1.1.2
   camera: ^0.11.0+2
-  # The default Android implementation from camera_android_camerax doesn't support the required image format.
-  camera_android: ^0.10.9+17
   path: ^1.9.0
   path_provider: ^2.1.4
 

packages/google_mlkit_commons/android/src/main/java/com/google_mlkit_commons/InputImageConverter.java

@@ -1,14 +1,20 @@
 package com.google_mlkit_commons;
 
 import android.content.Context;
+import android.graphics.Canvas;
 import android.graphics.ImageFormat;
+import android.graphics.SurfaceTexture;
+import android.media.Image;
+import android.media.ImageWriter;
 import android.net.Uri;
 import android.util.Log;
+import android.view.Surface;
 
 import com.google.mlkit.vision.common.InputImage;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.ByteBuffer;
 import java.util.Map;
 import java.util.Objects;
 
@@ -53,9 +59,36 @@ public static InputImage getInputImageFromData(Map<String, Object> imageData,
                                 rotationDegrees,
                                 imageFormat);
                     }
+                    if (imageFormat == ImageFormat.YUV_420_888) {
+                        // This image format is only supported in InputImage.fromMediaImage, which requires to transform the data to the right java type.
+                        ImageWriter writer = new ImageWriter.Builder(new Surface(new SurfaceTexture(true))).setWidthAndHeight(width, height).setImageFormat(imageFormat).build();
+                        // TODO(panmari): Does this need any cleanup by calling close() somewhere?
+                        // Currently, this causes some logging like
+                        // A resource failed to call Surface.release
+                        // Calling writer.close() likely will do the trick (after) processing).
+                        Image image = writer.dequeueInputImage();
+                        if (image == null) {
+                            result.error("InputImageConverterError", "failed to allocate space for input image", null);
+                            return null;
+                        }
+                        // Deconstruct individual planes again from flattened array. 
+                        Image.Plane[] planes = image.getPlanes();
+                        // Y plane
+                        ByteBuffer yBuffer = planes[0].getBuffer();
+                        yBuffer.put(data, 0, width * height);
+
+                        // U plane
+                        ByteBuffer uBuffer = planes[1].getBuffer();
+                        int uOffset = width * height;
+                        uBuffer.put(data, uOffset, (width * height) / 4);
+
+                        // V plane
+                        ByteBuffer vBuffer = planes[2].getBuffer();
+                        int vOffset = uOffset + (width * height) / 4;
+                        vBuffer.put(data, vOffset, (width * height) / 4);
+                        return InputImage.fromMediaImage(image, rotationDegrees);
+                    }
                     result.error("InputImageConverterError", "ImageFormat is not supported.", null);
-                    // TODO: Use InputImage.fromMediaImage, which supports more types, e.g. IMAGE_FORMAT_YUV_420_888.
-                    // See https://developers.google.com/android/reference/com/google/mlkit/vision/common/InputImage#fromMediaImage(android.media.Image,%20int)
                     return null;
                 } catch (Exception e) {
                     Log.e("ImageError", "Getting Image failed");