Method config_callback

src/audio_pdm/Recorder.cpp:122–186

}

void Recorder::config_callback(SensorConfigurationPacket *config) {
    // Check for PDM MIC ID
    if (config->sensorId != PDM_MIC) return;

    // Get sample rate
    int sample_rate = int(config->sampleRate);

    // Make sure that pdm mic is not running
    recorder.stop();

    // only end recording if sample rate is 0 or both mics are turned off
    if (sample_rate == 0 || (config->latency & 0xFFFF) == 0xFFFF) {
        return;
    }

    // Check for valid sample rate
    recorder.setSampleRate(sample_rate);

    int8_t gain_l = config->latency & 0xFF;
    int8_t gain_r = (config->latency >> 8) & 0xFF;
    
    // number of channels
    recorder.setChannels((gain_l >= 0) + (gain_r >= 0));

    // set gain for each channel
    pdm_mic.setGain(gain_l, gain_r);

    if (((config->latency >> 16) & 0xFF) == 1) {
        // ocllusion test
        recorder.setTarget(new BLEStream());
    } else {
        // find the next available file name for the recording
        const String recording_dir = "Recordings";

        if (!sd_manager.exists(recording_dir)) sd_manager.mkdir(recording_dir);

        ExFile file;
        ExFile dir = sd_manager.sd->open(recording_dir);

        char fileName[64];
        char * split;

        int n = 1;

        // find highest Recording number
        while (file = dir.openNextFile()) {
            file.getName(fileName, sizeof(fileName));

            split = strtok(fileName, "_");
            if (strcmp(split,"Recording") == 0) {
                split = strtok(NULL, "_");
                n = max(n, atoi(split) + 1);
            }
        }

        // file name of the new recording
        String file_name = "/" + recording_dir + "/Recording_" + String(n) + "_" + String(millis()) + ".wav";