int main(int argc, char *argv[]) {
    printf("Audio Processing \n");
    printf("blog:http://cpuimage.cnblogs.com/ \n");
    printf("Pitch Shifting Using The Fourier Transform\n");

    if (argc < 2)
        return -1;

    char *in_file = argv[1];
    uint32_t sampleRate = 0;
    uint64_t totalSampleCount = 0;
    uint32_t channels = 0;
    short *data_in = wavRead_s16(in_file, &sampleRate, &totalSampleCount, &channels);
    if (data_in != NULL) {
        float pitchShift = 0.9f;
        size_t ms = 50;
        size_t overSampling = 4;
        size_t frameSize = sampleRate * ms / 1000;
        frameSize += frameSize % 2;
        planData pitchPlanData = {0};
        double startTime = now();
        makePlanData(frameSize, overSampling, sampleRate, &pitchPlanData);
        pitchshift(pitchShift, data_in, data_in, totalSampleCount, &pitchPlanData);
        // turn to minion pitch
        {
            totalSampleCount /= 2;
            short *samples = data_in;
            for (int i = 0; i < totalSampleCount; i++) {
                data_in[i] = samples[0];
                samples += 2;
            }
        }
        double time_interval = calcElapsed(startTime, now());
        freePlanData(&pitchPlanData);
        printf("time interval: %f ms\n ", (time_interval * 1000));
    }
    char drive[3];
    char dir[256];
    char fname[256];
    char ext[256];
    char out_file[1024];
    splitpath(in_file, drive, dir, fname, ext);
    sprintf(out_file, "%s%s%s_out%s", drive, dir, fname, ext);
    wavWrite_s16(out_file, data_in, sampleRate, totalSampleCount);
    if (data_in) {
        free(data_in);
    }
    printf("press any key to exit.\n");
    getchar();
    return 0;
}