/*
 *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>

#include "dl/sp/api/armSP.h"
#include "dl/sp/api/omxSP.h"
#include "dl/sp/src/test/aligned_ptr.h"
#include "dl/sp/src/test/gensig.h"

#define MAX_FFT_ORDER TWIDDLE_TABLE_ORDER
#define MAX_FFT_ORDER_FIXED_POINT 12

typedef enum {
  rfft16_s16,
  rfft16_s16s32,
} rfft16_type;

void TimeOneFloatFFT(int count, int fft_log_size, float signal_value,
                     int signal_type);
void TimeFloatFFT(int count, float signal_value, int signal_type);
void TimeOneFloatRFFT(int count, int fft_log_size, float signal_value,
                      int signal_type);
void TimeFloatRFFT(int count, float signal_value, int signal_type);
void TimeOneSC32FFT(int count, int fft_log_size, float signal_value,
                    int signal_type);
void TimeSC32FFT(int count, float signal_value, int signal_type);
void TimeOneRFFT16(int count, int fft_log_size, float signal_value,
                   int signal_type, rfft16_type rfft16_type_selection);
void TimeRFFT16(int count, float signal_value, int signal_type);
void TimeOneRFFT32(int count, int fft_log_size, float signal_value,
                   int signal_type);
void TimeRFFT32(int count, float signal_value, int signal_type);

static int verbose = 1;
static int include_conversion = 0;
static int adapt_count = 1;
static int do_forward_test = 1;
static int do_inverse_test = 1;
static int min_fft_order = 2;
static int max_fft_order = MAX_FFT_ORDER;

void TimeFFTUsage(const char* prog) {
  fprintf(stderr, 
	  "%s: [-hTFICA] [-f fft] [-c count] [-n logsize] [-s scale]\n"
	  "    [-g signal-type] [-S signal value]\n"
	  "    [-m minFFTsize] [-M maxFFTsize]\n",
          ProgramName(prog));
  fprintf(stderr, 
	  "Simple FFT timing tests\n"
	  "  -h          This help\n"
	  "  -v level    Verbose output level (default = 1)\n"
	  "  -F          Skip forward FFT tests\n"
	  "  -I          Skip inverse FFT tests\n"
	  "  -C          Include float-to-fixed and fixed-to-float cost for"
	  " real\n"
	  "                16-bit FFT (forward and inverse)\n"
	  "  -c count    Number of FFTs to compute for timing.  This is a"
	  " lower\n"
	  "                lower limit; shorter FFTs will do more FFTs such"
	  " that the\n"
	  "                elapsed time is very roughly constant, if -A is"
	  " not given.\n"
	  "  -A          Don't adapt the count given by -c; use specified"
	  " value\n"
	  "  -m min      Mininum FFT order to test\n"
	  "  -M max      Maximum FFT order to test\n"
	  "  -T          Run just one FFT timing test\n"
	  "  -f          FFT type:\n"
	  "	         0 - Complex Float\n"
	  "	         1 - Real Float\n"
	  "	         2 - Complex 32-bit\n"
	  "	         3 - Real 16-bit\n"
	  "	         4 - Real 32-bit\n"
	  "  -n logsize  Log2 of FFT size\n"
	  "  -s scale    Scale factor for forward FFT (default = 0)\n"
	  "  -S signal   Base value for the test signal (default = 1024)\n"
	  "  -g type     Input signal type:\n"
	  "	         0 - Constant signal S + i*S. (Default value.)\n"
	  "	         1 - Real ramp starting at S/N, N = FFT size\n"
	  "	         2 - Sine wave of amplitude S\n"
	  "	         3 - Complex signal whose transform is a sine wave.\n"
	  "\n"
	  "Use -v 0 in combination with -F or -I to get output that can\n"
	  "be pasted into a spreadsheet.\n"
	  "\n"
	  "Most of the options listed after -T above are only applicable\n"
	  "when -T is given to test just one FFT size and FFT type.\n"
	  "\n");
  exit(0);
}

void main(int argc, char* argv[]) {
  int fft_log_size = 4;
  float signal_value = 32767;
  int signal_type = 0;
  int test_mode = 1;
  int count = 100;
  int fft_type = 0;
  int fft_type_given = 0;

  int opt;

  while ((opt = getopt(argc, argv, "hTFICAc:n:s:S:g:v:f:m:M:")) != -1) {
    switch (opt) {
      case 'h':
        TimeFFTUsage(argv[0]);
        break;
      case 'T':
        test_mode = 0;
        break;
      case 'C':
        include_conversion = 1;
        break;
      case 'F':
        do_forward_test = 0;
        break;
      case 'I':
        do_inverse_test = 0;
        break;
      case 'A':
        adapt_count = 0;
        break;
      case 'c':
        count = atoi(optarg);
        break;
      case 'n':
        fft_log_size = atoi(optarg);
        break;
      case 'S':
        signal_value = atof(optarg);
        break;
      case 'g':
        signal_type = atoi(optarg);
        break;
      case 'v':
        verbose = atoi(optarg);
        break;
      case 'f':
        fft_type = atoi(optarg);
        fft_type_given = 1;
        break;
      case 'm':
        min_fft_order = atoi(optarg);
        if (min_fft_order <= 2) {
          fprintf(stderr, "Setting min FFT order to 2 (from %d)\n",
                  min_fft_order);
          min_fft_order = 2;
        }
        break;
      case 'M':
        max_fft_order = atoi(optarg);
        if (max_fft_order > MAX_FFT_ORDER) {
          fprintf(stderr, "Setting max FFT order to %d (from %d)\n",
                  MAX_FFT_ORDER, max_fft_order);
          max_fft_order = MAX_FFT_ORDER;
        }
        break;
      default:
        TimeFFTUsage(argv[0]);
        break;
    }
  }

  if (test_mode && fft_type_given)
    printf("Warning:  -f ignored when -T not specified\n");

  if (test_mode) {
    TimeFloatFFT(count, signal_value, signal_type);
    TimeFloatRFFT(count, signal_value, signal_type);
    TimeSC32FFT(count, signal_value, signal_type);
    TimeRFFT16(count, signal_value, signal_type);
    TimeRFFT32(count, signal_value, signal_type);
  } else {
    switch (fft_type) {
      case 0:
        TimeOneFloatFFT(count, fft_log_size, signal_value, signal_type);
        break;
      case 1:
        TimeOneFloatRFFT(count, fft_log_size, signal_value, signal_type);
        break;
      case 2:
        TimeOneSC32FFT(count, fft_log_size, signal_value, signal_type);
        break;
      case 3:
        TimeOneRFFT16(count, fft_log_size, signal_value, signal_type, rfft16_s16s32);
        TimeOneRFFT16(count, fft_log_size, signal_value, signal_type, rfft16_s16);
        break;
      case 4:
        TimeOneRFFT32(count, fft_log_size, signal_value, signal_type);
        break;
      default:
        fprintf(stderr, "Unknown FFT type: %d\n", fft_type);
        break;
    }
  }
}

void GetUserTime(struct timeval* time) {
  struct rusage usage;
  getrusage(RUSAGE_SELF, &usage);
  memcpy(time, &usage.ru_utime, sizeof(*time));
}

double TimeDifference(const struct timeval * start,
                      const struct timeval * end) {
  double start_time;
  double end_time;
  start_time = start->tv_sec + start->tv_usec * 1e-6;
  end_time = end->tv_sec + end->tv_usec * 1e-6;

  return end_time - start_time;
}

void PrintResult(const char* prefix, int fft_log_size, double elapsed_time,
                 int count) {
  if (verbose == 0) {
    printf("%2d\t%8.4f\t%8d\t%.4e\n",
           fft_log_size, elapsed_time, count, 1000 * elapsed_time / count);
  } else {
    printf("%-18s:  order %2d:  %8.4f sec for %8d FFTs:  %.4e msec/FFT\n",
           prefix, fft_log_size, elapsed_time, count,
           1000 * elapsed_time / count);
  }
}

int ComputeCount(int nominal_count, int fft_log_size) {
  /*
   * Try to figure out how many repetitions to do for a given FFT
   * order (fft_log_size) given that we want a repetition of
   * nominal_count for order 15 FFTs to be the approsimate amount of
   * time we want to for all tests.
   */

  int count;
  if (adapt_count) {
    double maxTime = ((double) nominal_count) * (1 << MAX_FFT_ORDER)
        * MAX_FFT_ORDER;
    double c = maxTime / ((1 << fft_log_size) * fft_log_size);
    const int max_count = 10000000;

    count = (c > max_count) ? max_count : c;
  } else {
    count = nominal_count;
  }

  return count;
}

void TimeOneFloatFFT(int count, int fft_log_size, float signal_value,
                     int signal_type) {
  struct AlignedPtr* x_aligned;
  struct AlignedPtr* y_aligned;
  struct AlignedPtr* z_aligned;

  struct ComplexFloat* x;
  struct ComplexFloat* y;
  OMX_FC32* z;

  struct ComplexFloat* y_true;

  OMX_INT n, fft_spec_buffer_size;
  OMXFFTSpec_C_FC32 * fft_fwd_spec = NULL;
  OMXFFTSpec_C_FC32 * fft_inv_spec = NULL;
  int fft_size;
  struct timeval start_time;
  struct timeval end_time;
  double elapsed_time;

  fft_size = 1 << fft_log_size;

  x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
  y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
  z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);

  y_true = (struct ComplexFloat*) malloc(sizeof(*y_true) * fft_size);

  x = x_aligned->aligned_pointer_;
  y = y_aligned->aligned_pointer_;
  z = z_aligned->aligned_pointer_;

  GenerateTestSignalAndFFT(x, y_true, fft_size, signal_type, signal_value, 0);

  omxSP_FFTGetBufSize_C_FC32(fft_log_size, &fft_spec_buffer_size);

  fft_fwd_spec = (OMXFFTSpec_C_FC32*) malloc(fft_spec_buffer_size);
  fft_inv_spec = (OMXFFTSpec_C_FC32*) malloc(fft_spec_buffer_size);
  omxSP_FFTInit_C_FC32(fft_fwd_spec, fft_log_size);
  omxSP_FFTInit_C_FC32(fft_inv_spec, fft_log_size);

  if (do_forward_test) {
    GetUserTime(&start_time);
    for (n = 0; n < count; ++n) {
      omxSP_FFTFwd_CToC_FC32_Sfs(x, y, fft_fwd_spec);
    }
    GetUserTime(&end_time);

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Forward Float FFT", fft_log_size, elapsed_time, count);
  }

  if (do_inverse_test) {
    GetUserTime(&start_time);
    for (n = 0; n < count; ++n) {
      omxSP_FFTInv_CToC_FC32_Sfs(y, z, fft_inv_spec);
    }
    GetUserTime(&end_time);

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Inverse Float FFT", fft_log_size, elapsed_time, count);
  }

  FreeAlignedPointer(x_aligned);
  FreeAlignedPointer(y_aligned);
  FreeAlignedPointer(z_aligned);
  free(y_true);
  free(fft_fwd_spec);
  free(fft_inv_spec);
}

void TimeFloatFFT(int count, float signal_value, int signal_type) {
  int k;

  if (verbose == 0)
    printf("Float FFT\n");

  for (k = min_fft_order; k <= max_fft_order; ++k) {
    int testCount = ComputeCount(count, k);
    TimeOneFloatFFT(testCount, k, signal_value, signal_type);
  }
}

void GenerateRealFloatSignal(OMX_F32* x, OMX_FC32* fft, int size,
                             int signal_type, float signal_value)
{
  int k;
  struct ComplexFloat *test_signal;
  struct ComplexFloat *true_fft;

  test_signal = (struct ComplexFloat*) malloc(sizeof(*test_signal) * size);
  true_fft = (struct ComplexFloat*) malloc(sizeof(*true_fft) * size);
  GenerateTestSignalAndFFT(test_signal, true_fft, size, signal_type,
                           signal_value, 1);

  /*
   * Convert the complex result to what we want
   */

  for (k = 0; k < size; ++k) {
    x[k] = test_signal[k].Re;
  }

  for (k = 0; k < size / 2 + 1; ++k) {
    fft[k].Re = true_fft[k].Re;
    fft[k].Im = true_fft[k].Im;
  }

  free(test_signal);
  free(true_fft);
}

void TimeOneFloatRFFT(int count, int fft_log_size, float signal_value,
                      int signal_type) {
  OMX_F32* x;                   /* Source */
  OMX_F32* y;                   /* Transform */
  OMX_F32* z;                   /* Inverse transform */

  OMX_F32* y_true;              /* True FFT */

  struct AlignedPtr* x_aligned;
  struct AlignedPtr* y_aligned;
  struct AlignedPtr* z_aligned;


  OMX_INT n, fft_spec_buffer_size;
  OMXResult status;
  OMXFFTSpec_R_F32 * fft_fwd_spec = NULL;
  OMXFFTSpec_R_F32 * fft_inv_spec = NULL;
  int fft_size;
  struct timeval start_time;
  struct timeval end_time;
  double elapsed_time;

  fft_size = 1 << fft_log_size;

  x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
  /* The transformed value is in CCS format and is has fft_size + 2 values */
  y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
  z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);

  x = x_aligned->aligned_pointer_;
  y = y_aligned->aligned_pointer_;
  z = z_aligned->aligned_pointer_;

  y_true = (OMX_F32*) malloc(sizeof(*y_true) * (fft_size + 2));

  GenerateRealFloatSignal(x, (OMX_FC32*) y_true, fft_size, signal_type,
                          signal_value);

  status = omxSP_FFTGetBufSize_R_F32(fft_log_size, &fft_spec_buffer_size);

  fft_fwd_spec = (OMXFFTSpec_R_F32*) malloc(fft_spec_buffer_size);
  fft_inv_spec = (OMXFFTSpec_R_F32*) malloc(fft_spec_buffer_size);
  status = omxSP_FFTInit_R_F32(fft_fwd_spec, fft_log_size);

  status = omxSP_FFTInit_R_F32(fft_inv_spec, fft_log_size);

  if (do_forward_test) {
    GetUserTime(&start_time);
    for (n = 0; n < count; ++n) {
      omxSP_FFTFwd_RToCCS_F32_Sfs(x, y, fft_fwd_spec);
    }
    GetUserTime(&end_time);

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Forward Float RFFT", fft_log_size, elapsed_time, count);
  }

  if (do_inverse_test) {
    GetUserTime(&start_time);
    for (n = 0; n < count; ++n) {
      omxSP_FFTInv_CCSToR_F32_Sfs(y, z, fft_inv_spec);
    }
    GetUserTime(&end_time);

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Inverse Float RFFT", fft_log_size, elapsed_time, count);
  }

  FreeAlignedPointer(x_aligned);
  FreeAlignedPointer(y_aligned);
  FreeAlignedPointer(z_aligned);
  free(fft_fwd_spec);
  free(fft_inv_spec);
}

void TimeFloatRFFT(int count, float signal_value, int signal_type) {
  int k;

  if (verbose == 0)
    printf("Float RFFT\n");

  for (k = min_fft_order; k <= max_fft_order; ++k) {
    int testCount = ComputeCount(count, k);
    TimeOneFloatRFFT(testCount, k, signal_value, signal_type);
  }
}

void generateSC32Signal(OMX_SC32* x, OMX_SC32* fft, int size, int signal_type,
                        float signal_value) {
  int k;
  struct ComplexFloat *test_signal;
  struct ComplexFloat *true_fft;

  test_signal = (struct ComplexFloat*) malloc(sizeof(*test_signal) * size);
  true_fft = (struct ComplexFloat*) malloc(sizeof(*true_fft) * size);
  GenerateTestSignalAndFFT(test_signal, true_fft, size, signal_type,
                           signal_value, 0);

  /*
   * Convert the complex result to what we want
   */

  for (k = 0; k < size; ++k) {
    x[k].Re = 0.5 + test_signal[k].Re;
    x[k].Im = 0.5 + test_signal[k].Im;
    fft[k].Re = 0.5 + true_fft[k].Re;
    fft[k].Im = 0.5 + true_fft[k].Im;
  }

  free(test_signal);
  free(true_fft);
}

void TimeOneSC32FFT(int count, int fft_log_size, float signal_value,
                    int signal_type) {
  OMX_SC32* x;
  OMX_SC32* y;
  OMX_SC32* z;

  struct AlignedPtr* x_aligned;
  struct AlignedPtr* y_aligned;
  struct AlignedPtr* z_aligned;

  OMX_SC32* y_true;
  OMX_SC32* temp32a;
  OMX_SC32* temp32b;

  OMX_INT n, fft_spec_buffer_size;
  OMXResult status;
  OMXFFTSpec_C_SC32 * fft_fwd_spec = NULL;
  OMXFFTSpec_C_SC32 * fft_inv_spec = NULL;
  int fft_size;
  struct timeval start_time;
  struct timeval end_time;
  double elapsed_time;

  fft_size = 1 << fft_log_size;

  x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
  y_aligned = AllocAlignedPointer(32, sizeof(*y) * fft_size);
  z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
  y_true = (OMX_SC32*) malloc(sizeof(*y_true) * fft_size);
  temp32a = (OMX_SC32*) malloc(sizeof(*temp32a) * fft_size);
  temp32b = (OMX_SC32*) malloc(sizeof(*temp32b) * fft_size);

  x = x_aligned->aligned_pointer_;
  y = y_aligned->aligned_pointer_;
  z = z_aligned->aligned_pointer_;

  generateSC32Signal(x, y_true, fft_size, signal_type, signal_value);

  status = omxSP_FFTGetBufSize_C_SC32(fft_log_size, &fft_spec_buffer_size);

  fft_fwd_spec = (OMXFFTSpec_C_SC32*) malloc(fft_spec_buffer_size);
  fft_inv_spec = (OMXFFTSpec_C_SC32*) malloc(fft_spec_buffer_size);
  status = omxSP_FFTInit_C_SC32(fft_fwd_spec, fft_log_size);

  status = omxSP_FFTInit_C_SC32(fft_inv_spec, fft_log_size);

  if (do_forward_test) {
    if (include_conversion) {
      int k;
      float factor = -1;

      GetUserTime(&start_time);
      for (k = 0; k < count; ++k) {
        for (n = 0; n < fft_size; ++n) {
          if (fabs(x[n].Re) > factor) {
            factor = fabs(x[n].Re);
          }
          if (fabs(x[n].Im) > factor) {
            factor = fabs(x[n].Im);
          }
        }

        factor = ((1 << 18) - 1) / factor;
        for (n = 0; n < fft_size; ++n) {
          temp32a[n].Re = factor * x[n].Re;
          temp32a[n].Im = factor * x[n].Im;
        }

        omxSP_FFTFwd_CToC_SC32_Sfs(x, y, fft_fwd_spec, 0);

        factor = 1 / factor;
        for (n = 0; n < fft_size; ++n) {
          temp32b[n].Re = y[n].Re * factor;
          temp32b[n].Im = y[n].Im * factor;
        }
      }
      GetUserTime(&end_time);
    } else {
      GetUserTime(&start_time);
      for (n = 0; n < count; ++n) {
        omxSP_FFTFwd_CToC_SC32_Sfs(x, y, fft_fwd_spec, 0);
      }
      GetUserTime(&end_time);
    }

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Forward SC32 FFT", fft_log_size, elapsed_time, count);
  }

  if (do_inverse_test) {
    if (include_conversion) {
      int k;
      float factor = -1;

      GetUserTime(&start_time);
      for (k = 0; k < count; ++k) {
        for (n = 0; n < fft_size; ++n) {
          if (fabs(x[n].Re) > factor) {
            factor = fabs(x[n].Re);
          }
          if (fabs(x[n].Im) > factor) {
            factor = fabs(x[n].Im);
          }
        }
        factor = ((1 << 18) - 1) / factor;
        for (n = 0; n < fft_size; ++n) {
          temp32a[n].Re = factor * x[n].Re;
          temp32a[n].Im = factor * x[n].Im;
        }

        status = omxSP_FFTInv_CToC_SC32_Sfs(y, z, fft_inv_spec, 0);

        factor = 1 / factor;
        for (n = 0; n < fft_size; ++n) {
          temp32b[n].Re = y[n].Re * factor;
          temp32b[n].Im = y[n].Im * factor;
        }
      }
      GetUserTime(&end_time);
    } else {
      GetUserTime(&start_time);
      for (n = 0; n < count; ++n) {
        status = omxSP_FFTInv_CToC_SC32_Sfs(y, z, fft_inv_spec, 0);
      }
      GetUserTime(&end_time);
    }

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Inverse SC32 FFT", fft_log_size, elapsed_time, count);
  }

  FreeAlignedPointer(x_aligned);
  FreeAlignedPointer(y_aligned);
  FreeAlignedPointer(z_aligned);
  free(temp32a);
  free(temp32b);
  free(fft_fwd_spec);
  free(fft_inv_spec);
}

void TimeSC32FFT(int count, float signal_value, int signal_type) {
  int k;
  int max_order = (max_fft_order > MAX_FFT_ORDER_FIXED_POINT)
      ? MAX_FFT_ORDER_FIXED_POINT : max_fft_order;

  if (verbose == 0)
    printf("SC32 FFT\n");

  for (k = min_fft_order; k <= max_order; ++k) {
    int testCount = ComputeCount(count, k);
    TimeOneSC32FFT(testCount, k, signal_value, signal_type);
  }
}

void GenerateRFFT16Signal(OMX_S16* x, OMX_SC32* fft, int size, int signal_type,
                          float signal_value) {
  int k;
  struct ComplexFloat *test_signal;
  struct ComplexFloat *true_fft;

  test_signal = (struct ComplexFloat*) malloc(sizeof(*test_signal) * size);
  true_fft = (struct ComplexFloat*) malloc(sizeof(*true_fft) * size);
  GenerateTestSignalAndFFT(test_signal, true_fft, size, signal_type,
                           signal_value, 1);

  /*
   * Convert the complex result to what we want
   */

  for (k = 0; k < size; ++k) {
    x[k] = test_signal[k].Re;
  }

  for (k = 0; k < size / 2 + 1; ++k) {
    fft[k].Re = true_fft[k].Re;
    fft[k].Im = true_fft[k].Im;
  }

  free(test_signal);
  free(true_fft);
}

/* Argument rfft16_type_selection:
 *     rfft16_s16s32:       Calculate RFFT16 with 32 bit complex FFT;
 *     otherwise: Calculate RFFT16 with 16 bit complex FFT.
 */
void TimeOneRFFT16(int count, int fft_log_size, float signal_value,
                   int signal_type, rfft16_type rfft16_type_selection) {
  OMX_S16* x;
  OMX_S32* y;
  OMX_S16* z;
  OMX_S32* y_true;
  OMX_F32* xr;
  OMX_F32* yrTrue;

  struct AlignedPtr* x_aligned;
  struct AlignedPtr* y_aligned;
  struct AlignedPtr* z_aligned;
  struct AlignedPtr* y_trueAligned;
  struct AlignedPtr* xr_aligned;
  struct AlignedPtr* yr_true_aligned;


  OMX_S16* temp16;
  OMX_S32* temp32;


  OMX_INT n, fft_spec_buffer_size;
  OMXResult status;
  OMXFFTSpec_R_S16 * fft_fwd_spec = NULL;
  OMXFFTSpec_R_S16 * fft_inv_spec = NULL;
  int fft_size;
  struct timeval start_time;
  struct timeval end_time;
  double elapsed_time;
  int scaleFactor;

  fft_size = 1 << fft_log_size;
  scaleFactor = fft_log_size;

  x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
  y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
  z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);

  y_trueAligned = AllocAlignedPointer(32, sizeof(*y_true) * (fft_size + 2));

  xr_aligned = AllocAlignedPointer(32, sizeof(*xr) * fft_size);
  yr_true_aligned = AllocAlignedPointer(32, sizeof(*yrTrue) * (fft_size + 2));

  x = x_aligned->aligned_pointer_;
  y = y_aligned->aligned_pointer_;
  z = z_aligned->aligned_pointer_;
  y_true = y_trueAligned->aligned_pointer_;
  xr = xr_aligned->aligned_pointer_;
  yrTrue = yr_true_aligned->aligned_pointer_;

  temp16 = (OMX_S16*) malloc(sizeof(*temp16) * fft_size);
  temp32 = (OMX_S32*) malloc(sizeof(*temp32) * fft_size);


  GenerateRFFT16Signal(x, (OMX_SC32*) y_true, fft_size, signal_type,
                       signal_value);
  /*
   * Generate a real version so we can measure scaling costs
   */
  GenerateRealFloatSignal(xr, (OMX_FC32*) yrTrue, fft_size, signal_type,
                          signal_value);

  if(rfft16_type_selection == rfft16_s16s32) {
    status = omxSP_FFTGetBufSize_R_S16S32(fft_log_size, &fft_spec_buffer_size);
    fft_fwd_spec = malloc(fft_spec_buffer_size);
    fft_inv_spec = malloc(fft_spec_buffer_size);
    status = omxSP_FFTInit_R_S16S32(fft_fwd_spec, fft_log_size);
    status = omxSP_FFTInit_R_S16S32(fft_inv_spec, fft_log_size);
  }
  else {
    status = omxSP_FFTGetBufSize_R_S16(fft_log_size, &fft_spec_buffer_size);
    fft_fwd_spec = malloc(fft_spec_buffer_size);
    fft_inv_spec = malloc(fft_spec_buffer_size);
    status = omxSP_FFTInit_R_S16(fft_fwd_spec, fft_log_size);
    status = omxSP_FFTInit_R_S16(fft_inv_spec, fft_log_size);
  }

  if (do_forward_test) {
    if (include_conversion) {
      int k;
      float factor = -1;

      GetUserTime(&start_time);
      for (k = 0; k < count; ++k) {
        /*
         * Spend some time computing the max of the signal, and then scaling it.
         */
        for (n = 0; n < fft_size; ++n) {
          if (fabs(xr[n]) > factor) {
            factor = fabs(xr[n]);
          }
        }

        factor = 32767 / factor;
        for (n = 0; n < fft_size; ++n) {
          temp16[n] = factor * xr[n];
        }

        if(rfft16_type_selection == rfft16_s16s32) {
          status = omxSP_FFTFwd_RToCCS_S16S32_Sfs(x, y,
              (OMXFFTSpec_R_S16S32*)fft_fwd_spec, (OMX_INT) scaleFactor);
        }
        else {
          status = omxSP_FFTFwd_RToCCS_S16_Sfs(x, y,
              (OMXFFTSpec_R_S16*)fft_fwd_spec, (OMX_INT) scaleFactor);
        }
        /*
         * Now spend some time converting the fixed-point FFT back to float.
         */
        factor = 1 / factor;
        for (n = 0; n < fft_size + 2; ++n) {
          xr[n] = y[n] * factor;
        }
      }
      GetUserTime(&end_time);
    } else {
      float factor = -1;

      GetUserTime(&start_time);
      for (n = 0; n < count; ++n) {
      if(rfft16_type_selection == rfft16_s16s32) {
        status = omxSP_FFTFwd_RToCCS_S16S32_Sfs(x, y, 
            (OMXFFTSpec_R_S16S32*)fft_fwd_spec, (OMX_INT) scaleFactor);
      }
      else {
        status = omxSP_FFTFwd_RToCCS_S16_Sfs(x, y,
            (OMXFFTSpec_R_S16*)fft_fwd_spec, (OMX_INT) scaleFactor);
      }
      }
      GetUserTime(&end_time);
    }

    elapsed_time = TimeDifference(&start_time, &end_time);

    if(rfft16_type_selection == rfft16_s16s32) {
      PrintResult("Forward RFFT16 (with rfft16_s16s32)", fft_log_size, elapsed_time, count);
    }
    else {
      PrintResult("Forward RFFT16 (with rfft16_s16)", fft_log_size, elapsed_time, count);
    }
  }

  if (do_inverse_test) {
    if (include_conversion) {
      int k;
      float factor = -1;

      GetUserTime(&start_time);
      for (k = 0; k < count; ++k) {
        /*
         * Spend some time scaling the FFT signal to fixed point.
         */
        for (n = 0; n < fft_size; ++n) {
          if (fabs(yrTrue[n]) > factor) {
            factor = fabs(yrTrue[n]);
          }
        }
        for (n = 0; n < fft_size; ++n) {
          temp32[n] = factor * yrTrue[n];
        }

        if(rfft16_type_selection == rfft16_s16s32) {
          status = omxSP_FFTInv_CCSToR_S32S16_Sfs(y, z,
              (OMXFFTSpec_R_S16S32*)fft_inv_spec, 0);
        }
        else {
          status = omxSP_FFTInv_CCSToR_S16_Sfs(y, z,
              (OMXFFTSpec_R_S16*)fft_inv_spec, 0);
        }
        /*
         * Spend some time converting the result back to float
         */
        factor = 1 / factor;
        for (n = 0; n < fft_size; ++n) {
          xr[n] = factor * z[n];
        }
      }
      GetUserTime(&end_time);
    } else {
      GetUserTime(&start_time);
      for (n = 0; n < count; ++n) {
        if(rfft16_type_selection == rfft16_s16s32) {
          status = omxSP_FFTInv_CCSToR_S32S16_Sfs(y, z,
              (OMXFFTSpec_R_S16S32*)fft_inv_spec, 0);
        }
        else {
          status = omxSP_FFTInv_CCSToR_S16_Sfs(y, z,
              (OMXFFTSpec_R_S16*)fft_inv_spec, 0);
        }
      }
      GetUserTime(&end_time);
    }

    elapsed_time = TimeDifference(&start_time, &end_time);

    if(rfft16_type_selection == rfft16_s16s32) {
      PrintResult("Inverse RFFT16 (with rfft16_s16s32)", fft_log_size, elapsed_time, count);
    }
    else {
      PrintResult("Inverse RFFT16 (with rfft16_s16)", fft_log_size, elapsed_time, count);
    }
  }

  FreeAlignedPointer(x_aligned);
  FreeAlignedPointer(y_aligned);
  FreeAlignedPointer(z_aligned);
  FreeAlignedPointer(y_trueAligned);
  FreeAlignedPointer(xr_aligned);
  FreeAlignedPointer(yr_true_aligned);
  free(fft_fwd_spec);
  free(fft_inv_spec);
}

void TimeRFFT16(int count, float signal_value, int signal_type) {
  int k;
  int max_order = (max_fft_order > MAX_FFT_ORDER_FIXED_POINT)
      ? MAX_FFT_ORDER_FIXED_POINT : max_fft_order;
  if (verbose == 0)
    printf("RFFT16 (with rfft16_s16s32)\n");
  for (k = min_fft_order; k <= max_order; ++k) {
    int testCount = ComputeCount(count, k);
    TimeOneRFFT16(testCount, k, signal_value, signal_type, 1);
  }

  if (verbose == 0)
    printf("RFFT16 (with rfft16_s16)\n");
  for (k = min_fft_order; k <= max_order; ++k) {
    int testCount = ComputeCount(count, k);
    TimeOneRFFT16(testCount, k, signal_value, signal_type, 0);
  }
}

void GenerateRFFT32Signal(OMX_S32* x, OMX_SC32* fft, int size, int signal_type,
                          float signal_value) {
  int k;
  struct ComplexFloat *test_signal;
  struct ComplexFloat *true_fft;

  test_signal = (struct ComplexFloat*) malloc(sizeof(*test_signal) * size);
  true_fft = (struct ComplexFloat*) malloc(sizeof(*true_fft) * size);
  GenerateTestSignalAndFFT(test_signal, true_fft, size, signal_type,
                           signal_value, 1);

  /*
   * Convert the complex result to what we want
   */

  for (k = 0; k < size; ++k) {
    x[k] = test_signal[k].Re;
  }

  for (k = 0; k < size / 2 + 1; ++k) {
    fft[k].Re = true_fft[k].Re;
    fft[k].Im = true_fft[k].Im;
  }

  free(test_signal);
  free(true_fft);
}

void TimeOneRFFT32(int count, int fft_log_size, float signal_value,
                   int signal_type) {
  OMX_S32* x;
  OMX_S32* y;
  OMX_S32* z;
  OMX_S32* y_true;
  OMX_F32* xr;
  OMX_F32* yrTrue;

  struct AlignedPtr* x_aligned;
  struct AlignedPtr* y_aligned;
  struct AlignedPtr* z_aligned;
  struct AlignedPtr* y_true_aligned;

  OMX_S32* temp1;
  OMX_S32* temp2;

  OMX_INT n, fft_spec_buffer_size;
  OMXResult status;
  OMXFFTSpec_R_S16S32 * fft_fwd_spec = NULL;
  OMXFFTSpec_R_S16S32 * fft_inv_spec = NULL;
  int fft_size;
  struct timeval start_time;
  struct timeval end_time;
  double elapsed_time;
  int scaleFactor;

  fft_size = 1 << fft_log_size;

  x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
  y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
  z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);

  y_true_aligned = AllocAlignedPointer(32, sizeof(*y_true) * (fft_size + 2));

  x = x_aligned->aligned_pointer_;
  y = y_aligned->aligned_pointer_;
  z = z_aligned->aligned_pointer_;
  y_true = y_true_aligned->aligned_pointer_;

  if (verbose > 3) {
    printf("x = %p\n", (void*)x);
    printf("y = %p\n", (void*)y);
    printf("z = %p\n", (void*)z);
  }

  xr = (OMX_F32*) malloc(sizeof(*x) * fft_size);
  yrTrue = (OMX_F32*) malloc(sizeof(*y) * (fft_size + 2));
  temp1 = (OMX_S32*) malloc(sizeof(*temp1) * fft_size);
  temp2 = (OMX_S32*) malloc(sizeof(*temp2) * (fft_size + 2));

  GenerateRFFT32Signal(x, (OMX_SC32*) y_true, fft_size, signal_type,
                       signal_value);

  if (verbose > 63) {
    printf("Signal\n");
    printf("n\tx[n]\n");
    for (n = 0; n < fft_size; ++n) {
      printf("%4d\t%d\n", n, x[n]);
    }
  }

  status = omxSP_FFTGetBufSize_R_S32(fft_log_size, &fft_spec_buffer_size);
  if (verbose > 3) {
    printf("fft_spec_buffer_size = %d\n", fft_spec_buffer_size);
  }

  fft_fwd_spec = (OMXFFTSpec_R_S32*) malloc(fft_spec_buffer_size);
  fft_inv_spec = (OMXFFTSpec_R_S32*) malloc(fft_spec_buffer_size);
  status = omxSP_FFTInit_R_S32(fft_fwd_spec, fft_log_size);
  if (status) {
    printf("Failed to init forward FFT:  status = %d\n", status);
  }

  status = omxSP_FFTInit_R_S32(fft_inv_spec, fft_log_size);
  if (status) {
    printf("Failed to init backward FFT:  status = %d\n", status);
  }

  if (do_forward_test) {
    if (include_conversion) {
      int k;
      float factor = -1;

      GetUserTime(&start_time);
      for (k = 0; k < count; ++k) {
        /*
         * Spend some time computing the max of the signal, and then scaling it.
         */
        for (n = 0; n < fft_size; ++n) {
          if (fabs(xr[n]) > factor) {
            factor = fabs(xr[n]);
          }
        }

        factor = (1 << 20) / factor;
        for (n = 0; n < fft_size; ++n) {
          temp1[n] = factor * xr[n];
        }

        status = omxSP_FFTFwd_RToCCS_S32_Sfs(x, y, fft_fwd_spec,
                                             (OMX_INT) scaleFactor);

        /*
         * Now spend some time converting the fixed-point FFT back to float.
         */
        factor = 1 / factor;
        for (n = 0; n < fft_size + 2; ++n) {
          xr[n] = y[n] * factor;
        }
      }
      GetUserTime(&end_time);
    } else {
      float factor = -1;

      GetUserTime(&start_time);
      for (n = 0; n < count; ++n) {
        status = omxSP_FFTFwd_RToCCS_S32_Sfs(x, y, fft_fwd_spec,
                                             (OMX_INT) scaleFactor);
      }
      GetUserTime(&end_time);
    }

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Forward RFFT32", fft_log_size, elapsed_time, count);
  }

  if (do_inverse_test) {
    if (include_conversion) {
      int k;
      float factor = -1;

      GetUserTime(&start_time);
      for (k = 0; k < count; ++k) {
        /*
         * Spend some time scaling the FFT signal to fixed point.
         */
        for (n = 0; n < fft_size + 2; ++n) {
          if (fabs(yrTrue[n]) > factor) {
            factor = fabs(yrTrue[n]);
          }
        }
        for (n = 0; n < fft_size + 2; ++n) {
          temp2[n] = factor * yrTrue[n];
        }

        status = omxSP_FFTInv_CCSToR_S32_Sfs(y, z, fft_inv_spec, 0);

        /*
         * Spend some time converting the result back to float
         */
        factor = 1 / factor;
        for (n = 0; n < fft_size; ++n) {
          xr[n] = factor * z[n];
        }
      }
      GetUserTime(&end_time);
    } else {
      GetUserTime(&start_time);
      for (n = 0; n < count; ++n) {
        status = omxSP_FFTInv_CCSToR_S32_Sfs(y, z, fft_inv_spec, 0);
      }
      GetUserTime(&end_time);
    }

    elapsed_time = TimeDifference(&start_time, &end_time);

    PrintResult("Inverse RFFT32", fft_log_size, elapsed_time, count);
  }

  FreeAlignedPointer(x_aligned);
  FreeAlignedPointer(y_aligned);
  FreeAlignedPointer(z_aligned);
  FreeAlignedPointer(y_true_aligned);
  free(fft_fwd_spec);
  free(fft_inv_spec);
}

void TimeRFFT32(int count, float signal_value, int signal_type) {
  int k;
  int max_order = (max_fft_order > MAX_FFT_ORDER_FIXED_POINT)
      ? MAX_FFT_ORDER_FIXED_POINT : max_fft_order;

  if (verbose == 0)
    printf("RFFT32\n");

  for (k = min_fft_order; k <= max_order; ++k) {
    int testCount = ComputeCount(count, k);
    TimeOneRFFT32(testCount, k, signal_value, signal_type);
  }
}