fusionpbx-app-transcribe/resources/classes/transcribe_azure.com

<?php


 /**
 * transcribe_azure class
 *
 * @method null download
 */
if (!class_exists('transcribe_azure')) {
	class transcribe_azure implements transcribe_interface {

		/**
		 * declare private variables
		 */
		private $api_key;
		private $api_url;
		private $language;
		private $path;
		private $filename;
		private $format;
		private $voice;
		private $message;
		private $model;

		/**
		 * called when the object is created
		 */
		public function __construct($settings) {

			//build the setting object and get the recording path
			$this->api_key = $settings->get('transcribe', 'api_key');
			$this->api_url = $settings->get('transcribe', 'api_url');
			$this->language = $settings->get('transcribe', 'language');

		}

		public function set_path(string $audio_path) {
			$this->path = $audio_path;
		}

		public function set_filename(string $audio_filename) {
			$this->filename = $audio_filename;
		}

		public function set_format(string $audio_format) {
			$this->format = $audio_format;
		}

		public function set_voice(string $audio_voice) {
			$this->voice = $audio_voice;
		}

		public function set_language(string $audio_language) {
			$this->language = $audio_language;
		}

		public function set_translate(string $audio_translate) {
			$this->translate = $audio_translate;
		}

		public function set_message(string $audio_message) {
			$this->message = $audio_message;
		}

		public function is_language_enabled() : bool {
			//return the whether engine is handles languages
			return false;
		}

		public function is_translate_enabled() : bool {
			//return the whether engine is able to translate
			return false;
		}

		public function get_languages() : array {
			//create the languages array
			$languages = array(
				"af" => "Afrikaans",
				"ar" => "Arabic",
				"hy" => "Armenian",
				"az" => "Azerbaijani",
				"be" => "Belarusian",
				"bs" => "Bosnian",
				"bg" => "Bulgarian",
				"ca" => "Catalan",
				"zh" => "Chinese",
				"hr" => "Croatian",
				"cs" => "Czech",
				"da" => "Danish",
				"nl" => "Dutch",
				"en" => "English",
				"et" => "Estonian",
				"fi" => "Finnish",
				"fr" => "French",
				"gl" => "Galician",
				"de" => "German",
				"el" => "Greek",
				"he" => "Hebrew",
				"hi" => "Hindi",
				"hu" => "Hungarian",
				"is" => "Icelandic",
				"id" => "Indonesian",
				"it" => "Italian",
				"ja" => "Japanese",
				"kn" => "Kannada",
				"kk" => "Kazakh",
				"ko" => "Korean",
				"lv" => "Latvian",
				"lt" => "Lithuanian",
				"mk" => "Macedonian",
				"ms" => "Malay",
				"mr" => "Marathi",
				"mi" => "Maori",
				"ne" => "Nepali",
				"no" => "Norwegian",
				"fa" => "Persian",
				"pl" => "Polish",
				"pt" => "Portuguese",
				"ro" => "Romanian",
				"ru" => "Russian",
				"sr" => "Serbian",
				"sk" => "Slovak",
				"sl" => "Slovenian",
				"es" => "Spanish",
				"sw" => "Swahili",
				"sv" => "Swedish",
				"tl" => "Tagalog",
				"ta" => "Tamil",
				"th" => "Thai",
				"tr" => "Turkish",
				"uk" => "Ukrainian",
				"ur" => "Urdu",
				"vi" => "Vietnamese",
				"cy" => "Welsh"
			);

			//return the languages array
			return $languages;
		}

		/**
		 * transcribe - speech to text
		 */
		public function transcribe() : string {

			//get the content type
			$path_array = pathinfo($this->path.'/'.$this->filename);
			if ($path_array['extension'] == "mp3") {
				$content_type = 'audio/mp3';
			}
			if ($path_array['extension'] == "wav") {
				$content_type = 'audio/wav';
			}

			//start output buffer
			ob_start();
			$out = fopen('php://output', 'w');

			if (isset($api_key) && $api_key != '') {

				$url = "https://" . $this->api_url . ".api.cognitive.microsoft.com/sts/v1.0/issueToken";
				$headers = [
					"Content-type: application/x-www-form-urlencoded",
					"Content-Length: 0",
					"Ocp-Apim-Subscription-Key: " . $this->api_key
				];

				// initialize a curl handle
				$ch = curl_init($url);

				//set the request method to POST
				curl_setopt($ch, CURLOPT_POST, true);
				
				//send the http headers
				curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
				
				//return the response as a string instead of outputting it directly
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

				//run the curl request to get the access token
				$access_token = curl_exec($ch);

				//close the handle
				curl_close($ch);
 
				//if a token was returned then use it to make the transcribe request
				if (empty($access_token)) {
					return false;
				}
				else {
					$url = "https://" . $this->api_url . ".stt.speech.microsoft.com/speech/recognition/conversation/cognitiveservices/v1?language=" . $this->language . "&format=detailed";
					$file_path = $file_path . '/' . $file_name;
					$headers = [
						"Authorization: Bearer " . $access_token,
						"Content-type: audio/wav; codec=\"audio/pcm\"; samplerate=8000; trustsourcerate=false"
					];

					//initialize a curl handle
					$ch = curl_init($url);

					//set the request method to POST
					curl_setopt($ch, CURLOPT_POST, true);

					//send the http headers
					curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
					
					//send the file using 
					curl_setopt($ch, CURLOPT_POSTFIELDS, file_get_contents($file_path));

					//return the response as a string instead of outputting it directly
					curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

					//add verbose for debugging
					curl_setopt($ch, CURLOPT_VERBOSE, true);
					curl_setopt($ch, CURLOPT_STDERR, $out);

					//run the curl request to transcribe the message
					$json_response = curl_exec($ch);

					//check for errors
					if (curl_errno($ch)) {
						echo 'Error: ' . curl_error($ch);
						exit;
					}

					//close the handle
					curl_close($ch);

					//convert the json to an a
					$array = json_decode($json_response, true);

					//validate the json
					if ($array === null) {
						return 'invalid json';
					}
					else {
						$this->message = $array['NBest'][0]['Display'];
					}
				}

			}

			//return the transcription
			if (empty($this->message)) {
				return '';
			}
			else {
				return $this->message;
			}

		}

	}
}

?>