12/31/2023 0 Comments Speech to text converter mac![]() ![]() The type property will contain one of three values: connected, partial and final. The API will send JSON formatted messages containing a type property to indicate the type of response that is being sent. ![]() Find the full code on GitHub here Send/Receive Data For this example, we will send a wav file. The API accepts the following audio formats: raw audio, flac, and wav. The URL must also include your access token and the content type as URL parameters. To connect to the Streaming API a WebSocket connection is made to the following URL, wss:///speechtotext/v1/stream. Try Rev AI for Free Connect to the Web Socket The API receives binary audio and returns recognized speech content in JSON format. The streaming API uses the WebSocket protocol to allow duplex communication across a single TCP connection. The following example will show how to use the streaming API to transcribe a sample audio file. Find the full code on GitHub here How to Use the Rev AI Streaming API Using the word-level timestamps we can simulate captioning. The JSON formatted response contains additional information such as speaker segmentation, punctuation, and word-level timestamps. Find the full code on GitHub here Simulate Captioning To circumvent this we create a handler for the response that changes the Content-Type to application/json. Although application/1.0+json is JSON, C++Rest SDK does not recognize it as a JSON Content-Type. The value application/1.0+json is used to return a JSON formatted transcription. If the value is text/plain the response will return the transcription in plaintext format. The format of the response is determined by the value in the Accept header that is sent in the request. When the processing status is transcribed the transcription can be retrieved by sending a GET request to the URL. Find the full code on GitHub here Get the Transcript When the processing status is transcribed the transcription is ready to be retrieved. The response will be a JSON object containing the processing status of the job. To poll the server we will send a GET request every 5 seconds to the URL. Find the full code on GitHub here Poll for Processing Completion ![]() The job id will be used to poll the status of the job and to retrieve the transcription when processing is complete. The request will respond with a JSON object containing the id of the job that is being processed. Find the full code on GitHub here Get JobID Polling is not recommended in a production environment but since the file we are trying to transcribe is relatively short we will poll the server every few seconds to determine when the job has been completed. To keep this example simple we will use polling to determine when the processing is complete. Typically we would define a callback_url in our initial request that listens for an HTTP Post message when the transcription processing is complete. If we wanted to upload a file we would set the Content-Type header to multipart/form-data. For this example, we will use the application/json Content-Type which allows us to define a file located at a URL to transcribe. A job is created by sending an HTTP Post request to the URL request should include the Content-Type header that defines the format of the body of the request. Submitting a file to be transcribed by the asynchronous speech-to-text engine is known as a job. The following example will show how to use the asynchronous API to transcribe a sample audio file. Information on how to install the SDK and include it in a C++ application can be found at. The C++Rest SDK is an open-source library that allows C++ applications to communicate with a RESTful service or Websockets over a TCP connection. To communicate with the API we will use Microsoft’s C++Rest SDK. Get an Access Token: Try the Rev AI API for Free C++Rest SDK The access token should be sent as a header in a request sent to the API in the format Authorization: Bearer. Click on the Access Token and generate a new token. To sign up for an access token create an account at. To use the Rev.ai API an access token is needed. The API exposes RESTful endpoints that are used to perform tasks such as submit media to be transcribed and retrieve transcriptions. The Streaming API uses WebSockets to allow duplex communication over a single TCP connection. The Streaming API allows real-time transcription of an audio or video feed. Using the Asynchronous API an hour-long recording can be processed in a matter of minutes. The Asynchronous API allows pre-recorded audio or video files to be transcribed via an HTTP POST request. The Rev.ai automated text-to-speech suite consists of 2 APIs for processing media files: the Asynchronous API and the Streaming API. Communicating with an API using C++ Asynchronous and Streaming API ![]()
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