function detect_intent_stream()

in dialogflow/src/detect_intent_stream.php [32:108]

• 57 lines of code
• 8 McCabe index (conditional complexity)

function detect_intent_stream($projectId, $path, $sessionId, $languageCode = 'en-US')
{
    // need to use gRPC
    if (!defined('Grpc\STATUS_OK')) {
        throw new \Exception('Install the grpc extension ' .
            '(pecl install grpc)');
    }

    // new session
    $sessionsClient = new SessionsClient();
    $session = $sessionsClient->sessionName($projectId, $sessionId ?: uniqid());
    printf('Session path: %s' . PHP_EOL, $session);

    // hard coding audio_encoding and sample_rate_hertz for simplicity
    $audioConfig = new InputAudioConfig();
    $audioConfig->setAudioEncoding(AudioEncoding::AUDIO_ENCODING_LINEAR_16);
    $audioConfig->setLanguageCode($languageCode);
    $audioConfig->setSampleRateHertz(16000);

    // create query input
    $queryInput = new QueryInput();
    $queryInput->setAudioConfig($audioConfig);

    // first request contains the configuration
    $request = new StreamingDetectIntentRequest();
    $request->setSession($session);
    $request->setQueryInput($queryInput);
    $requests = [$request];

    // we are going to read small chunks of audio data from
    // a local audio file. in practice, these chunks should
    // come from an audio input device.
    $audioStream = fopen($path, 'rb');
    while (true) {
        $chunk = stream_get_contents($audioStream, 4096);
        if (!$chunk) {
            break;
        }
        $request = new StreamingDetectIntentRequest();
        $request->setInputAudio($chunk);
        $requests[] = $request;
    }

    // intermediate transcript info
    print(PHP_EOL . str_repeat('=', 20) . PHP_EOL);
    $stream = $sessionsClient->streamingDetectIntent();
    foreach ($requests as $request) {
        $stream->write($request);
    }
    foreach ($stream->closeWriteAndReadAll() as $response) {
        $recognitionResult = $response->getRecognitionResult();
        if ($recognitionResult) {
            $transcript = $recognitionResult->getTranscript();
            printf('Intermediate transcript: %s' . PHP_EOL, $transcript);
        }
    }

    // get final response and relevant info
    if ($response) {
        print(str_repeat('=', 20) . PHP_EOL);
        $queryResult = $response->getQueryResult();
        $queryText = $queryResult->getQueryText();
        $intent = $queryResult->getIntent();
        $displayName = $intent->getDisplayName();
        $confidence = $queryResult->getIntentDetectionConfidence();
        $fulfilmentText = $queryResult->getFulfillmentText();

        // output relevant info
        printf('Query text: %s' . PHP_EOL, $queryText);
        printf('Detected intent: %s (confidence: %f)' . PHP_EOL, $displayName,
            $confidence);
        print(PHP_EOL);
        printf('Fulfilment text: %s' . PHP_EOL, $fulfilmentText);
    }

    $sessionsClient->close();
}