Google Cloud Speech API using php - php

Question

I am trying to call Google Cloud Speech API by using PHP and got a problem.
$stturl = "https://speech.googleapis.com/v1beta1/speech:syncrecognize?key=xxxxxxxxxxxx";
$upload = file_get_contents("1.wav");
$upload = base64_encode($upload);
$data = array(
"config" => array(
"encoding" => "LINEAR16",
"sampleRate" => 16000,
"languageCode" => "en-US"
),
"audio" => array(
"Content" => $upload,
)
);
$jsonData = json_encode($data);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $stturl);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);
$result = curl_exec($ch);
The result says that it is INVALID JSON PAYLOAD.
{ "error": { "code": 400, "message": "Invalid JSON payload received.
Unknown name \"content\" at 'audio': Cannot find field.", "status":
"INVALID_ARGUMENT", "details": [ { "#type":
"type.googleapis.com/google.rpc.BadRequest", "fieldViolations": [ {
"field": "audio", "description": "Invalid JSON payload received.
Unknown name \"content\" at 'audio': Cannot find field." } ] } ] } } "
I think this is because $upload isn't configured correctly.
According Google Cloud Speech API, it should be "A base64-encoded string".
https://cloud.google.com/speech/reference/rest/v1beta1/RecognitionAudio
That's why I used base64_encode function, but it seems JSON doesn't process this value correctly.
Any thoughts?

Answer 1

You need to construct the properly formatted input as an array and then json encode it. For example, to send a file, base64encode it as "content" and submit to the API as shown:
$data = array(
"config" => array(
"encoding" => "LINEAR16",
"sample_rate" => $bitRate,
"language_code" => "en-IN"
),
"audio" => array(
"content" => base64_encode($filedata)
)
);
$data_string = json_encode($data);
$ch = curl_init($googlespeechURL);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data_string))
);
$result = curl_exec($ch);
$result_array = json_decode($result, true);

Answer 2

please make 'content' instead of 'Content'
small letter 'c'
its work for me.