speech_detection_google.hpp

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#ifndef RAPP_CLOUD_SPEECH_TO_TEXT_GOOGLE
#define RAPP_CLOUD_SPEECH_TO_TEXT_GOOGLE
#include "includes.ihh"
namespace rapp {
namespace cloud {
class speech_detection_google : public asio_service_http
{
public:
    speech_detection_google(
                              const std::shared_ptr<rapp::object::audio> file,
                              const std::string language,
                              const std::string user,
                              std::function<void(std::vector<std::string>,
                                                 std::vector<std::string>)> callback
                           )
    : rapp::services::asio_service_http (), delegate_(callback)
    {
        assert(file);
        std::string boundary = random_boundary();
        std::string fname =  random_boundary() + file->extension(); 
        boost::property_tree::ptree tree;
        tree.put("language", language);
        tree.put("user", user);
        tree.put("audio_source", file->audio_source());
        std::stringstream ss;
        boost::property_tree::write_json(ss, tree, false);
        post_ += "--" + boundary + "\r\n"
              + "Content-Disposition: form-data; name=\"file_uri\"; filename=\""+fname+"\"\r\n"
              + "Content-Transfer-Encoding: binary\r\n\r\n";
        auto bytes = file->bytearray();
        post_.insert( post_.end(), bytes.begin(), bytes.end() );
        post_ += "\r\n" + "--" + boundary + "--";
        header_ =  "POST /hop/speech_detection_google HTTP/1.1\r\n";
        header_ += "Content-Type: multipart/form-data; boundary=" + boundary + "\r\n\r\n";
        callback_ = std::bind(&speech_detection_google::handle_reply, this, std::placeholders::_1);
    }
private:
    void handle_reply(std::string json)
    {
        std::stringstream ss(json);
        std::vector<std::string> words;        
        std::vector<std::string> alternatives;
        try {
            boost::property_tree::ptree tree;
            boost::property_tree::read_json(ss, tree);
            // JSON response is: { words: [], alternatives: [], error: '' } 
            for (auto child : tree.get_child("words")) {
                words.push_back(child.second.get_value<std::string>());
            }
            for (auto child : tree.get_child("alternatives")) {
                alternatives.push_back(child.second.get_value<std::string>());
            }
            // Check for error response from platform
            for (auto child : tree.get_child("error")) {
                const std::string value = child.second.get_value<std::string>();
                if (!value.empty()) {
                    std::cerr << "speech_detection_google error: " << value << std::endl;
                }
            }
        }
        catch (boost::property_tree::json_parser::json_parser_error & je) {
            std::cerr << "speech_detection_google::handle_reply Error parsing: " << je.filename() 
                      << " on line: " << je.line() << std::endl;
            std::cerr << je.message() << std::endl;
        }
        delegate_(words, alternatives);
    }
    std::function<void(std::vector<std::string>, std::vector<std::string>)> delegate_;
};
}
}
#endif