Sample using C interface

C example.

See full example cpp/sound4.impact.cl-pipe.cpp

Sample to create the processing instance

see Process creation/destruction and Update Management

    // Setup parameters
    struct impact_CParameters *params = impact_NewParameters();
    // Optional: activate web authentication, set admin password
    // This creates the authentication only for a new storage path
    impact_SetParameter(params,"ADMIN_USER", "admin");
    impact_SetParameter(params,"ADMIN_SECRET", "admin");
    
    // Create the processing instance
    pInstance=impact_InitProcess2(pLoginKey,pRadioName,pKeyId,pAccessKey,store_path.c_str(), params);
    impact_FreeParameters(params);
    if (!pInstance) {
      std::cerr << "Failed to create the process instance"<< std::endl;
      return 1;
    }
 
    // Start the update thread, without JSON server (low priority)
    std::thread updater([pInstance](){
       // will returned when stopped or destroyed
       std::cerr << "impact_StartUpdateThread (no json port)" << std::endl;
       impact_StartUpdateThread(pInstance, 0);
       std::cerr << "impact_StartUpdateThread END" << std::endl;
     });
 
    // This is not mandatory, but better be sure we are ready right now
    std::cerr << "Waiting update thread" << std::endl;
    if (impact_WaitUpdateThreadReady(pInstance, 5000)<0) {
        std::cerr << "Timeout to create the process instance"<< std::endl;
    }
    std::cerr << "Waiting update thread DONE" << std::endl;
 
#if (IMPACT_HAS_WEBSERVER)
    // Starts a web server, listening on port http://localhost:8080, https://localhost:8443
    std::cerr << "Starting web server" << std::endl;
    int listenport= 8080;
    int listenport_secure= 8443;
    uint64_t webserver= SOUND4_INVALID_WEBSERVER_ID;
    if (listenport || listenport_secure) {
        webserver = impact_Webserver(listenport,listenport_secure,pInstance);
        if (webserver==SOUND4_INVALID_WEBSERVER_ID) {
            std::cerr << "Starting web server FAILED" << std::endl;
        } else {
            int web_status=impact_Webserver_Status(webserver);
            if (listenport) {
                if (web_status & SOUND4_WEBSERVER_HTTP_OK) {
                    std::cerr << "Web server listening on port " << listenport;
                } else {
                    std::cerr << "Web server failed to listen on port " << listenport;
                }
            }
            if (listenport_secure) {
                if (web_status & SOUND4_WEBSERVER_HTTPS_OK) {
                    std::cerr << "Web server listening on secure port " << listenport_secure;
                } else {
                    std::cerr << "Web server failed to listen on secure port " << listenport_secure;
                }
            }
            std::cerr << "Starting web server DONE" << std::endl;
        }
    }
#endif // (IMPACT_HAS_WEBSERVER)
     
     // Force load a factory preset now
     // Could be used instead of setting a store_path
     /*{
         impact_CClientInstance *pClient=impact_NewClient(pInstance);
         const char *answer=impact_ProcessJson(pClient, "{ \"factoryload\": \"All Programs\" }", NULL);
         std::cerr << "Loaded factory preset answer: " << answer<< std::endl;
         impact_FreeJsonAnswer(answer);
         impact_DeleteClient(pClient);
     }*/

Sample processing loop

see Direct processing

bool stopthread=false;
alignas(64) float audio_in[CHUNK_SIZE*CHANNEL_COUNT];
alignas(64) float audio_out[CHUNK_SIZE*CHANNEL_COUNT];
 
    #if defined(_WIN32) || defined(WIN32)
        // Windows: The stdin, stdout, and stderr streams always open in text mode by default
        _setmode(_fileno(stdin), _O_BINARY);
        _setmode(_fileno(stdout), _O_BINARY);
    #endif
    
    while (!stopthread)
    {
        // Read a chunk from stdin
        if (std::fread(&audio_in[0], sizeof(float), CHUNK_SIZE*CHANNEL_COUNT, stdin) != CHUNK_SIZE*CHANNEL_COUNT) {
            std::cerr << "ProcessLoop: input stopped"<< std::endl;
            stopthread=true;
            break;
        }
        if (stopthread) break;
        // Process it
        impact_ProcessAudio(pInstance, audio_in, audio_out);
        // Write it to stdout
        if (fwrite(&audio_out[0], sizeof(float), CHUNK_SIZE*CHANNEL_COUNT, stdout) != CHUNK_SIZE*CHANNEL_COUNT) {
            std::cerr << "Failed to write audio output" << std::endl;
            stopthread=true;
        }
    }

Sample to stop the processing instance

see Process creation/destruction

#if (IMPACT_HAS_WEBSERVER)
    // Stopping the webserver
    std::cerr << "Stopping web server" << std::endl;
    impact_Webserver_Stop(webserver, 1000);
    std::cerr << "Stopping web server DONE" << std::endl;
#endif // (IMPACT_HAS_WEBSERVER)
    
    // Stopping the processing instance
    std::cerr << "Stopping Update thread" << std::endl;
    impact_StopUpdateThread(pInstance); // this will exit the update thread
    std::cerr << "Stopping Update thread DONE" << std::endl;
 
    updater.join();
 
    impact_ExitProcess(pInstance);