This is the response object from the SynthesizeSpeech operation.
Inheritance: Amazon.Runtime.AmazonWebServiceResponse
        /// <summary>
        /// Unmarshaller the response from the service to the response class.
        /// </summary>  
        /// <param name="context"></param>
        /// <returns></returns>
        public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
        {
            SynthesizeSpeechResponse response = new SynthesizeSpeechResponse();

            response.AudioStream = context.Stream;
            if (context.ResponseData.IsHeaderPresent("Content-Type"))
                response.ContentType = context.ResponseData.GetHeaderValue("Content-Type");
            if (context.ResponseData.IsHeaderPresent("x-amzn-RequestCharacters"))
                response.RequestCharacters = int.Parse(context.ResponseData.GetHeaderValue("x-amzn-RequestCharacters"), CultureInfo.InvariantCulture);

            return response;
        }