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chore: Improve native Frame Processor Plugin documentation (#1877)

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Mateusz Mędrek 2023-10-03 11:36:55 +02:00 committed by GitHub
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5 changed files with 54 additions and 48 deletions
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4
.github/workflows/build-ios.yml vendored
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@ -56,7 +56,7 @@ jobs:
uses: actions/cache@v3
with:
path: |
example/ios/Pods
package/example/ios/Pods
~/Library/Caches/CocoaPods
~/.cocoapods
key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
@ -117,7 +117,7 @@ jobs:
uses: actions/cache@v3
with:
path: |
example/ios/Pods
package/example/ios/Pods
~/Library/Caches/CocoaPods
~/.cocoapods
key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}

24
docs/docs/guides/FRAME_PROCESSORS_CREATE_OVERVIEW.mdx
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@ -51,8 +51,9 @@ Similar to a TurboModule, the Frame Processor Plugin Registry API automatically
Return values will automatically be converted to JS values, assuming they are representable in the ["Types" table](#types). So the following Java Frame Processor Plugin:
```java
@Nullable
@Override
public Object callback(Frame frame, Object[] params) {
public Object callback(@NonNull Frame frame, @Nullable Map<String, Object> arguments) {
return "cat";
}
```
@ -70,8 +71,9 @@ export function detectObject(frame: Frame): string {
You can also manipulate the buffer and return it (or a copy of it) by returning a [`Frame`][2]/[`Frame`][3] instance:
```java
@Nullable
@Override
public Object callback(Frame frame, Object[] params) {
public Object callback(@NonNull Frame frame, @Nullable Map<String, Object> arguments) {
Frame resizedFrame = new Frame(/* ... */);
return resizedFrame;
}
@ -107,12 +109,13 @@ const frameProcessor = useFrameProcessor((frame) => {
To let the user know that something went wrong you can use Exceptions:
```java
@Nullable
@Override
public Object callback(Frame frame, Object[] params) {
if (params[0] instanceof String) {
public Object callback(@NonNull Frame frame, @Nullable Map<String, Object> arguments) {
if (arguments != null && arguments.get("codeType") instanceof String) {
// ...
} else {
throw new Exception("First argument has to be a string!");
throw new Exception("codeType property has to be a string!");
}
}
```
@ -123,7 +126,7 @@ Which will throw a JS-error:
const frameProcessor = useFrameProcessor((frame) => {
'worklet'
try {
const codes = scanCodes(frame, true)
const codes = scanCodes(frame, { codeType: 1234 })
} catch (e) {
console.log(`Error: ${e.message}`)
}
@ -143,9 +146,14 @@ If your Frame Processor takes longer than a single frame interval to execute, or
For example, a realtime video chat application might use WebRTC to send the frames to the server. I/O operations (networking) are asynchronous, and we don't _need_ to wait for the upload to succeed before pushing the next frame, so we copy the frame and perform the upload on another Thread.
```java
@Nullable
@Override
public Object callback(Frame frame, Object[] params) {
String serverURL = (String)params[0];
public Object callback(@NonNull Frame frame, @Nullable Map<String, Object> arguments) {
if (arguments == null) {
return null;
}
String serverURL = (String)arguments.get("serverURL");
Frame frameCopy = new Frame(/* ... */);
uploaderQueue.runAsync(() -> {

1
docs/docs/guides/FRAME_PROCESSOR_CREATE_FINAL.mdx
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@ -18,6 +18,7 @@ const plugin = VisionCameraProxy.getFrameProcessorPlugin('scanFaces')
*/
export function scanFaces(frame: Frame): object {
'worklet'
if (plugin == null) throw new Error('Failed to load Frame Processor Plugin "scanFaces"!')
return plugin.call(frame)
}
```

30
docs/docs/guides/FRAME_PROCESSOR_CREATE_PLUGIN_ANDROID.mdx
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@ -34,7 +34,7 @@ For reference see the [CLI's docs](https://github.com/mateusz1913/vision-camera-
protected List<ReactPackage> getPackages() {
@SuppressWarnings("UnnecessaryLocalVariable")
List<ReactPackage> packages = new PackageList(this).getPackages();
...
// ...
// highlight-next-line
packages.add(new FaceDetectorFrameProcessorPluginPackage()); // <- add
return packages;
@ -56,13 +56,16 @@ For reference see the [CLI's docs](https://github.com/mateusz1913/vision-camera-
3. Add the following code:
```java
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.mrousavy.camera.frameprocessor.Frame;
import com.mrousavy.camera.frameprocessor.FrameProcessorPlugin;
public class FaceDetectorFrameProcessorPlugin extends FrameProcessorPlugin {
@Nullable
@Override
public Object callback(Frame frame, Map<String, Object> arguments) {
public Object callback(@NonNull Frame frame, @Nullable Map<String, Object> arguments) {
// highlight-next-line
// code goes here
return null;
}
@ -73,20 +76,20 @@ public class FaceDetectorFrameProcessorPlugin extends FrameProcessorPlugin {
5. Create a new Java file which registers the Frame Processor Plugin in a React Package, for the Face Detector plugin this file will be called `FaceDetectorFrameProcessorPluginPackage.java`:
```java
import androidx.annotation.NonNull;
import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;
import com.mrousavy.camera.frameprocessor.FrameProcessorPlugin;
import com.mrousavy.camera.frameprocessor.FrameProcessorPluginRegistry;
import javax.annotation.Nonnull;
public class FaceDetectorFrameProcessorPluginPackage implements ReactPackage {
FaceDetectorFrameProcessorPluginPackage() {
// highlight-start
FaceDetectorFrameProcessorPluginPackage() {
FrameProcessorPluginRegistry.addFrameProcessorPlugin("detectFaces", options -> new FaceDetectorFrameProcessorPlugin());
// highlight-end
}
// highlight-end
@NonNull
@Override
@ -94,9 +97,9 @@ public class FaceDetectorFrameProcessorPluginPackage implements ReactPackage {
return Collections.emptyList();
}
@Nonnull
@NonNull
@Override
public List<ViewManager> createViewManagers(@Nonnull ReactApplicationContext reactContext) {
public List<ViewManager> createViewManagers(@NonNull ReactApplicationContext reactContext) {
return Collections.emptyList();
}
}
@ -113,7 +116,7 @@ The Frame Processor Plugin will be exposed to JS through the `VisionCameraProxy`
protected List<ReactPackage> getPackages() {
@SuppressWarnings("UnnecessaryLocalVariable")
List<ReactPackage> packages = new PackageList(this).getPackages();
...
// ...
// highlight-next-line
packages.add(new FaceDetectorFrameProcessorPluginPackage()); // <- add
return packages;
@ -133,7 +136,8 @@ import com.mrousavy.camera.frameprocessor.FrameProcessorPlugin
class FaceDetectorFrameProcessorPlugin: FrameProcessorPlugin() {
override fun callback(frame: Frame, arguments: Map<String, Object>): Any? {
override fun callback(frame: Frame, arguments: Map<String, Object>?): Any? {
// highlight-next-line
// code goes here
return null
}
@ -151,13 +155,13 @@ import com.facebook.react.uimanager.ViewManager
import com.mrousavy.camera.frameprocessor.FrameProcessorPlugin
class FaceDetectorFrameProcessorPluginPackage : ReactPackage {
init {
// highlight-start
init {
FrameProcessorPluginRegistry.addFrameProcessorPlugin("detectFaces") { options ->
FaceDetectorFrameProcessorPlugin()
}
// highlight-end
}
// highlight-end
override fun createNativeModules(reactContext: ReactApplicationContext): List<NativeModule> {
return emptyList()
@ -180,7 +184,7 @@ The Frame Processor Plugin will be exposed to JS through the `VisionCameraProxy`
protected List<ReactPackage> getPackages() {
@SuppressWarnings("UnnecessaryLocalVariable")
List<ReactPackage> packages = new PackageList(this).getPackages();
...
// ...
// highlight-next-line
packages.add(new FaceDetectorFrameProcessorPluginPackage()); // <- add
return packages;

43
docs/docs/guides/FRAME_PROCESSOR_CREATE_PLUGIN_IOS.mdx
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@ -60,7 +60,7 @@ For reference see the [CLI's docs](https://github.com/mateusz1913/vision-camera-
CMSampleBufferRef buffer = frame.buffer;
UIImageOrientation orientation = frame.orientation;
// code goes here
return @[];
return nil;
}
+ (void) load {
@ -89,56 +89,49 @@ The Frame Processor Plugin will be exposed to JS through the `VisionCameraProxy`
![Xcode "Create Bridging Header" alert](https://docs-assets.developer.apple.com/published/7ebca7212c/2a065d1a-7e53-4907-a889-b7fa4f2206c9.png)
3. Inside the newly created Bridging Header, add the following code:
```objc
#import <VisionCamera/FrameProcessorPlugin.h>
#import <VisionCamera/Frame.h>
```
4. In the Swift file, add the following code:
3. In the Swift file, add the following code:
```swift
import VisionCamera
@objc(FaceDetectorFrameProcessorPlugin)
public class FaceDetectorFrameProcessorPlugin: FrameProcessorPlugin {
public override func callback(_ frame: Frame!,
withArguments arguments: [String:Any]) -> Any {
public override func callback(_ frame: Frame, withArguments arguments: [AnyHashable : Any]?) -> Any {
let buffer = frame.buffer
let orientation = frame.orientation
// code goes here
return []
return nil
}
}
```
5. In your `AppDelegate.m`, add the following imports:
4. Create an Objective-C source file that will be used to automatically register your plugin
```objc
#import "YOUR_XCODE_PROJECT_NAME-Swift.h"
#import <VisionCamera/FrameProcessorPlugin.h>
#import <VisionCamera/FrameProcessorPluginRegistry.h>
```
6. In your `AppDelegate.m`, add the following code to `application:didFinishLaunchingWithOptions:`:
#import "YOUR_XCODE_PROJECT_NAME-Swift.h" // <--- replace "YOUR_XCODE_PROJECT_NAME" with the actual value of your xcode project name
```objc
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
@interface FaceDetectorFrameProcessorPlugin (FrameProcessorPluginLoader)
@end
@implementation FaceDetectorFrameProcessorPlugin (FrameProcessorPluginLoader)
+ (void)load
{
// ...
// highlight-start
[FrameProcessorPluginRegistry addFrameProcessorPlugin:@"detectFaces"
withInitializer:^FrameProcessorPlugin*(NSDictionary* options) {
withInitializer:^FrameProcessorPlugin* (NSDictionary* options) {
return [[FaceDetectorFrameProcessorPlugin alloc] initWithOptions:options];
}];
// highlight-end
return [super application:application didFinishLaunchingWithOptions:launchOptions];
}
@end
```
7. **Implement your frame processing.** See [Example Plugin (Swift)](https://github.com/mrousavy/react-native-vision-camera/blob/main/package/example/ios/Frame%20Processor%20Plugins/Example%20Plugin%20%28Swift%29) for reference.
5. **Implement your frame processing.** See [Example Plugin (Swift)](https://github.com/mrousavy/react-native-vision-camera/blob/main/package/example/ios/Frame%20Processor%20Plugins/Example%20Plugin%20%28Swift%29) for reference.
</TabItem>