@tensorflow/tfjs-data
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TensorFlow Data API in JavaScript
192 lines • 25.9 kB
JavaScript
/**
* @license
* Copyright 2018 Google LLC. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* =============================================================================
*/
import { browser, cast, env, expandDims, image, reshape, tensor1d, tensor2d, tidy, util } from '@tensorflow/tfjs-core';
import { LazyIterator } from './lazy_iterator';
/**
* Provide a stream of image tensors from webcam video stream. Only works in
* browser environment.
*/
export class WebcamIterator extends LazyIterator {
constructor(webcamVideoElement, webcamConfig) {
super();
this.webcamVideoElement = webcamVideoElement;
this.webcamConfig = webcamConfig;
this.isClosed = true;
this.resize = false;
if (this.needToResize()) {
this.resize = true;
this.cropSize =
[this.webcamConfig.resizeHeight, this.webcamConfig.resizeWidth];
this.cropBoxInd = tensor1d([0], 'int32');
if (this.webcamConfig.centerCrop) {
// Calculate the box based on resizing shape.
const widthCroppingRatio = this.webcamConfig.resizeWidth * 1.0 / this.webcamVideoElement.width;
const heightCroppingRatio = this.webcamConfig.resizeHeight * 1.0 /
this.webcamVideoElement.height;
const widthCropStart = (1 - widthCroppingRatio) / 2;
const heightCropStart = (1 - heightCroppingRatio) / 2;
const widthCropEnd = widthCropStart + widthCroppingRatio;
const heightCropEnd = heightCroppingRatio + heightCropStart;
this.cropBox = tensor2d([heightCropStart, widthCropStart, heightCropEnd, widthCropEnd], [1, 4]);
}
else {
this.cropBox = tensor2d([0, 0, 1, 1], [1, 4]);
}
}
}
summary() {
return `webcam`;
}
// Construct a WebcamIterator and start it's video stream.
static async create(webcamVideoElement, webcamConfig = {}) {
if (!env().get('IS_BROWSER')) {
throw new Error('tf.data.webcam is only supported in browser environment.');
}
if (!webcamVideoElement) {
// If webcam video element is not provided, create a hidden video element
// with provided width and height.
webcamVideoElement = document.createElement('video');
if (!webcamConfig.resizeWidth || !webcamConfig.resizeHeight) {
throw new Error('Please provide webcam video element, or resizeWidth and ' +
'resizeHeight to create a hidden video element.');
}
webcamVideoElement.width = webcamConfig.resizeWidth;
webcamVideoElement.height = webcamConfig.resizeHeight;
}
const webcamIterator = new WebcamIterator(webcamVideoElement, webcamConfig);
// Call async function to initialize the video stream.
await webcamIterator.start();
return webcamIterator;
}
// Async function to start video stream.
async start() {
if (this.webcamConfig.facingMode) {
util.assert((this.webcamConfig.facingMode === 'user') ||
(this.webcamConfig.facingMode === 'environment'), () => `Invalid webcam facing mode: ${this.webcamConfig.facingMode}. ` +
`Please provide 'user' or 'environment'`);
}
try {
this.stream = await navigator.mediaDevices.getUserMedia({
video: {
deviceId: this.webcamConfig.deviceId,
facingMode: this.webcamConfig.facingMode ?
this.webcamConfig.facingMode :
'user',
width: this.webcamVideoElement.width,
height: this.webcamVideoElement.height
}
});
}
catch (e) {
// Modify the error message but leave the stack trace intact
e.message = `Error thrown while initializing video stream: ${e.message}`;
throw e;
}
if (!this.stream) {
throw new Error('Could not obtain video from webcam.');
}
// Older browsers may not have srcObject
try {
this.webcamVideoElement.srcObject = this.stream;
}
catch (error) {
console.log(error);
this.webcamVideoElement.src = window.URL.createObjectURL(this.stream);
}
// Start the webcam video stream
this.webcamVideoElement.play();
this.isClosed = false;
return new Promise(resolve => {
// Add event listener to make sure the webcam has been fully initialized.
this.webcamVideoElement.onloadedmetadata = () => {
resolve();
};
});
}
async next() {
if (this.isClosed) {
return { value: null, done: true };
}
let img;
try {
img = browser.fromPixels(this.webcamVideoElement);
}
catch (e) {
throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(e)}`);
}
if (this.resize) {
try {
return { value: this.cropAndResizeFrame(img), done: false };
}
catch (e) {
throw new Error(`Error thrown cropping the video: ${e.message}`);
}
finally {
img.dispose();
}
}
else {
return { value: img, done: false };
}
}
needToResize() {
// If resizeWidth and resizeHeight are provided, and different from the
// width and height of original HTMLVideoElement, then resizing and cropping
// is required.
if (this.webcamConfig.resizeWidth && this.webcamConfig.resizeHeight &&
(this.webcamVideoElement.width !== this.webcamConfig.resizeWidth ||
this.webcamVideoElement.height !== this.webcamConfig.resizeHeight)) {
return true;
}
return false;
}
// Cropping and resizing each frame based on config
cropAndResizeFrame(img) {
return tidy(() => {
const expandedImage = expandDims(cast(img, 'float32'), (0));
let resizedImage;
resizedImage = image.cropAndResize(expandedImage, this.cropBox, this.cropBoxInd, this.cropSize, 'bilinear');
// Extract image from batch cropping.
const shape = resizedImage.shape;
return reshape(resizedImage, shape.slice(1));
});
}
// Capture one frame from the video stream, and extract the value from
// iterator.next() result.
async capture() {
return (await this.next()).value;
}
// Stop the video stream and pause webcam iterator.
stop() {
const tracks = this.stream.getTracks();
tracks.forEach(track => track.stop());
try {
this.webcamVideoElement.srcObject = null;
}
catch (error) {
console.log(error);
this.webcamVideoElement.src = null;
}
this.isClosed = true;
}
// Override toArray() function to prevent collecting.
toArray() {
throw new Error('Can not convert infinite video stream to array.');
}
}
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* @license\n * Copyright 2018 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n *\n * =============================================================================\n */\n\nimport {browser, cast, env, expandDims, image, reshape, tensor1d, Tensor1D, tensor2d, Tensor2D, Tensor3D, Tensor4D, tidy, util} from '@tensorflow/tfjs-core';\nimport {WebcamConfig} from '../types';\nimport {LazyIterator} from './lazy_iterator';\n\n/**\n * Provide a stream of image tensors from webcam video stream. Only works in\n * browser environment.\n */\nexport class WebcamIterator extends LazyIterator<Tensor3D> {\n  private isClosed = true;\n  private stream: MediaStream;\n  private resize = false;\n  private cropSize: [number, number];\n  private cropBox: Tensor2D;\n  private cropBoxInd: Tensor1D;\n\n  private constructor(\n      protected readonly webcamVideoElement: HTMLVideoElement,\n      protected readonly webcamConfig: WebcamConfig) {\n    super();\n    if (this.needToResize()) {\n      this.resize = true;\n      this.cropSize =\n          [this.webcamConfig.resizeHeight, this.webcamConfig.resizeWidth];\n      this.cropBoxInd = tensor1d([0], 'int32');\n      if (this.webcamConfig.centerCrop) {\n        // Calculate the box based on resizing shape.\n        const widthCroppingRatio =\n            this.webcamConfig.resizeWidth * 1.0 / this.webcamVideoElement.width;\n        const heightCroppingRatio = this.webcamConfig.resizeHeight * 1.0 /\n            this.webcamVideoElement.height;\n        const widthCropStart = (1 - widthCroppingRatio) / 2;\n        const heightCropStart = (1 - heightCroppingRatio) / 2;\n        const widthCropEnd = widthCropStart + widthCroppingRatio;\n        const heightCropEnd = heightCroppingRatio + heightCropStart;\n        this.cropBox = tensor2d(\n            [heightCropStart, widthCropStart, heightCropEnd, widthCropEnd],\n            [1, 4]);\n      } else {\n        this.cropBox = tensor2d([0, 0, 1, 1], [1, 4]);\n      }\n    }\n  }\n\n  summary() {\n    return `webcam`;\n  }\n\n  // Construct a WebcamIterator and start it's video stream.\n  static async create(\n      webcamVideoElement?: HTMLVideoElement, webcamConfig: WebcamConfig = {}) {\n    if (!env().get('IS_BROWSER')) {\n      throw new Error(\n          'tf.data.webcam is only supported in browser environment.');\n    }\n\n    if (!webcamVideoElement) {\n      // If webcam video element is not provided, create a hidden video element\n      // with provided width and height.\n      webcamVideoElement = document.createElement('video');\n      if (!webcamConfig.resizeWidth || !webcamConfig.resizeHeight) {\n        throw new Error(\n            'Please provide webcam video element, or resizeWidth and ' +\n            'resizeHeight to create a hidden video element.');\n      }\n      webcamVideoElement.width = webcamConfig.resizeWidth;\n      webcamVideoElement.height = webcamConfig.resizeHeight;\n    }\n    const webcamIterator = new WebcamIterator(webcamVideoElement, webcamConfig);\n\n    // Call async function to initialize the video stream.\n    await webcamIterator.start();\n\n    return webcamIterator;\n  }\n\n  // Async function to start video stream.\n  async start(): Promise<void> {\n    if (this.webcamConfig.facingMode) {\n      util.assert(\n          (this.webcamConfig.facingMode === 'user') ||\n              (this.webcamConfig.facingMode === 'environment'),\n          () =>\n              `Invalid webcam facing mode: ${this.webcamConfig.facingMode}. ` +\n              `Please provide 'user' or 'environment'`);\n    }\n\n    try {\n      this.stream = await navigator.mediaDevices.getUserMedia({\n        video: {\n          deviceId: this.webcamConfig.deviceId,\n          facingMode: this.webcamConfig.facingMode ?\n              this.webcamConfig.facingMode :\n              'user',\n          width: this.webcamVideoElement.width,\n          height: this.webcamVideoElement.height\n        }\n      });\n    } catch (e) {\n      // Modify the error message but leave the stack trace intact\n      e.message = `Error thrown while initializing video stream: ${e.message}`;\n      throw e;\n    }\n\n    if (!this.stream) {\n      throw new Error('Could not obtain video from webcam.');\n    }\n\n    // Older browsers may not have srcObject\n    try {\n      this.webcamVideoElement.srcObject = this.stream;\n    } catch (error) {\n      console.log(error);\n      this.webcamVideoElement.src = window.URL.createObjectURL(\n        this.stream as unknown as MediaSource);\n    }\n    // Start the webcam video stream\n    this.webcamVideoElement.play();\n\n    this.isClosed = false;\n\n    return new Promise<void>(resolve => {\n      // Add event listener to make sure the webcam has been fully initialized.\n      this.webcamVideoElement.onloadedmetadata = () => {\n        resolve();\n      };\n    });\n  }\n\n  async next(): Promise<IteratorResult<Tensor3D>> {\n    if (this.isClosed) {\n      return {value: null, done: true};\n    }\n\n    let img;\n    try {\n      img = browser.fromPixels(this.webcamVideoElement);\n    } catch (e) {\n      throw new Error(\n          `Error thrown converting video to pixels: ${JSON.stringify(e)}`);\n    }\n    if (this.resize) {\n      try {\n        return {value: this.cropAndResizeFrame(img), done: false};\n      } catch (e) {\n        throw new Error(`Error thrown cropping the video: ${e.message}`);\n      } finally {\n        img.dispose();\n      }\n    } else {\n      return {value: img, done: false};\n    }\n  }\n\n  private needToResize() {\n    // If resizeWidth and resizeHeight are provided, and different from the\n    // width and height of original HTMLVideoElement, then resizing and cropping\n    // is required.\n    if (this.webcamConfig.resizeWidth && this.webcamConfig.resizeHeight &&\n        (this.webcamVideoElement.width !== this.webcamConfig.resizeWidth ||\n         this.webcamVideoElement.height !== this.webcamConfig.resizeHeight)) {\n      return true;\n    }\n    return false;\n  }\n\n  // Cropping and resizing each frame based on config\n  cropAndResizeFrame(img: Tensor3D): Tensor3D {\n    return tidy(() => {\n      const expandedImage: Tensor4D = expandDims(cast(img, 'float32'), (0));\n      let resizedImage;\n      resizedImage = image.cropAndResize(\n          expandedImage, this.cropBox, this.cropBoxInd, this.cropSize,\n          'bilinear');\n      // Extract image from batch cropping.\n      const shape = resizedImage.shape;\n      return reshape(resizedImage, shape.slice(1) as [number, number, number]);\n    });\n  }\n\n  // Capture one frame from the video stream, and extract the value from\n  // iterator.next() result.\n  async capture(): Promise<Tensor3D> {\n    return (await this.next()).value;\n  }\n\n  // Stop the video stream and pause webcam iterator.\n  stop(): void {\n    const tracks = this.stream.getTracks();\n\n    tracks.forEach(track => track.stop());\n\n    try {\n      this.webcamVideoElement.srcObject = null;\n    } catch (error) {\n      console.log(error);\n      this.webcamVideoElement.src = null;\n    }\n    this.isClosed = true;\n  }\n\n  // Override toArray() function to prevent collecting.\n  override toArray(): Promise<Tensor3D[]> {\n    throw new Error('Can not convert infinite video stream to array.');\n  }\n}\n"]}