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How to call Microsoft cognitive services face api in unity , Imagine you can take snap shot of the user can show different content based on their gender, age or emotion! read more here https://azure.microsoft.com/en-au/services/cognitive-services/face/
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using System; | |
using System.Collections; | |
using System.Collections.Generic; | |
using System.IO; | |
using Assets.Scripts.Models; | |
using UnityEngine; | |
//https://www.packtpub.com/books/content/using-rest-api-unity-part-1-what-rest-and-basic-queries | |
namespace Assets.Scripts.Services | |
{ | |
public class FaceApiService | |
{ | |
private readonly MonoBehaviour _caller; | |
private readonly string _queryString = | |
"returnFaceId=true&returnFaceLandmarks=false&returnFaceAttributes=age,gender,facialhair,glasses,emotion"; //, | |
private string _faceApiUrl; | |
private string _results; | |
private Dictionary<string, string> _headers; | |
public FaceApiResultItemCollection Results | |
{ | |
get | |
{ | |
if (string.IsNullOrEmpty(_results) || _results == "[]") | |
{ | |
return null; | |
} | |
FaceApiResultItemCollection resultObject = null; | |
try | |
{ | |
//it's a hack there should be a better way | |
var temp = "{\"FaceApiResultItems\":" + _results + "}"; | |
//add objects | |
resultObject = JsonUtility.FromJson<FaceApiResultItemCollection>(temp); | |
} | |
catch (Exception e) | |
{ | |
Debug.Log(e.Message); | |
} | |
return resultObject; | |
} | |
} | |
public FaceApiService(MonoBehaviour caller, string faceApiUrl, string subscriptionKey) | |
{ | |
_faceApiUrl = faceApiUrl; | |
if (!string.IsNullOrEmpty(_faceApiUrl) && !_faceApiUrl.EndsWith("/")) | |
{ | |
_faceApiUrl = _faceApiUrl + "/"; | |
} | |
_caller = caller; | |
_headers = | |
new Dictionary<string, string> | |
{ | |
{"Ocp-Apim-Subscription-Key", subscriptionKey}, | |
{"Content-Type", "application/octet-stream"} | |
}; | |
} | |
internal WWW Detect(byte[] imageByteData, Action onCompleteCallback) | |
{ | |
var requesturi = _faceApiUrl + "detect?" + _queryString; | |
var www = new WWW(requesturi, imageByteData, _headers); | |
_caller.StartCoroutine(WaitForRequest(www, onCompleteCallback)); | |
return www; | |
} | |
public WWW Detect(string imageFilePath, Action onCompleteCallback) | |
{ | |
var requesturi = _faceApiUrl + "detect?" + _queryString; | |
var byteData = GetImageAsByteArray(imageFilePath); | |
var www = new WWW(requesturi, byteData, _headers); | |
_caller.StartCoroutine(WaitForRequest(www, onCompleteCallback)); | |
return www; | |
} | |
private byte[] GetImageAsByteArray(string imageFilePath) | |
{ | |
var fileStream = new FileStream(imageFilePath, FileMode.Open, FileAccess.Read); | |
var binaryReader = new BinaryReader(fileStream); | |
return binaryReader.ReadBytes((int)fileStream.Length); | |
} | |
private IEnumerator WaitForRequest(WWW www, Action onComplete) | |
{ | |
yield return www; | |
// check for errors | |
if (string.IsNullOrEmpty(www.error)) | |
{ | |
_results = www.text; | |
if (!string.IsNullOrEmpty(www.error)) | |
{ | |
Debug.Log(_results); | |
Debug.Log(www.error); | |
} | |
onComplete(); | |
} | |
} | |
} | |
} |
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//how to use the api =>
//to get FaceApiUrl and FaceApiSubscriptionKey follow https://azure.microsoft.com/en-au/services/cognitive-services/face/
var service = new FaceApiService(this, FaceApiUrl, FaceApiSubscriptionKey);
//imageByteArray is the image you want to analayze ,SetFaceApiAnalyzeResultCallbackMethod is a method you want to be called when API returned back the result
service.Detect(imageByteArray, SetFaceApiAnalyzeResultCallbackMethod);