react-native-vision-camera/ios/Frame Processor/FrameHostObject.mm
Marc Rousavy 90f2a1ef7d
fix: Fix close being called on a collected reference (enforce alias_ref) (#379)
* fix: Fix `close` being called on a collected reference (enforce `alias_ref`)

* Remove `~FrameHostObject` on iOS too
2021-08-20 16:05:02 +02:00

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//
// FrameHostObject.m
// VisionCamera
//
// Created by Marc Rousavy on 22.03.21.
// Copyright © 2021 mrousavy. All rights reserved.
//
#import "FrameHostObject.h"
#import <Foundation/Foundation.h>
#import <jsi/jsi.h>
std::vector<jsi::PropNameID> FrameHostObject::getPropertyNames(jsi::Runtime& rt) {
std::vector<jsi::PropNameID> result;
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("toString")));
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("isValid")));
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("width")));
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("height")));
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("bytesPerRow")));
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("planesCount")));
result.push_back(jsi::PropNameID::forUtf8(rt, std::string("close")));
return result;
}
jsi::Value FrameHostObject::get(jsi::Runtime& runtime, const jsi::PropNameID& propName) {
auto name = propName.utf8(runtime);
if (name == "toString") {
auto toString = [this] (jsi::Runtime& runtime, const jsi::Value&, const jsi::Value*, size_t) -> jsi::Value {
if (this->frame == nil) {
return jsi::String::createFromUtf8(runtime, "[closed frame]");
}
auto imageBuffer = CMSampleBufferGetImageBuffer(frame.buffer);
auto width = CVPixelBufferGetWidth(imageBuffer);
auto height = CVPixelBufferGetHeight(imageBuffer);
NSMutableString* string = [NSMutableString stringWithFormat:@"%lu x %lu Frame", width, height];
return jsi::String::createFromUtf8(runtime, string.UTF8String);
};
return jsi::Function::createFromHostFunction(runtime, jsi::PropNameID::forUtf8(runtime, "toString"), 0, toString);
}
if (name == "close") {
auto close = [this] (jsi::Runtime& runtime, const jsi::Value&, const jsi::Value*, size_t) -> jsi::Value {
if (this->frame == nil) {
throw jsi::JSError(runtime, "Trying to close an already closed frame! Did you call frame.close() twice?");
}
this->close();
return jsi::Value::undefined();
};
return jsi::Function::createFromHostFunction(runtime, jsi::PropNameID::forUtf8(runtime, "close"), 0, close);
}
if (name == "isValid") {
auto isValid = frame != nil && CMSampleBufferIsValid(frame.buffer);
return jsi::Value(isValid);
}
if (name == "width") {
this->assertIsFrameStrong(runtime, name);
auto imageBuffer = CMSampleBufferGetImageBuffer(frame.buffer);
auto width = CVPixelBufferGetWidth(imageBuffer);
return jsi::Value((double) width);
}
if (name == "height") {
this->assertIsFrameStrong(runtime, name);
auto imageBuffer = CMSampleBufferGetImageBuffer(frame.buffer);
auto height = CVPixelBufferGetHeight(imageBuffer);
return jsi::Value((double) height);
}
if (name == "bytesPerRow") {
this->assertIsFrameStrong(runtime, name);
auto imageBuffer = CMSampleBufferGetImageBuffer(frame.buffer);
auto bytesPerRow = CVPixelBufferGetPlaneCount(imageBuffer);
return jsi::Value((double) bytesPerRow);
}
if (name == "planesCount") {
this->assertIsFrameStrong(runtime, name);
auto imageBuffer = CMSampleBufferGetImageBuffer(frame.buffer);
auto planesCount = CVPixelBufferGetPlaneCount(imageBuffer);
return jsi::Value((double) planesCount);
}
return jsi::Value::undefined();
}
void FrameHostObject::assertIsFrameStrong(jsi::Runtime &runtime, const std::string &accessedPropName) {
if (frame == nil) {
auto message = "Cannot get `" + accessedPropName + "`, frame is already closed!";
throw jsi::JSError(runtime, message.c_str());
}
}
void FrameHostObject::close() {
if (frame != nil) {
CMSampleBufferInvalidate(frame.buffer);
// ARC will hopefully delete it lol
this->frame = nil;
}
}