Add openmax dl routines for review. MUST NOT BE LANDED

third_party/openmax_dl/dl/sp/src/test/test_fft16.c

Index: third_party/openmax_dl/dl/sp/src/test/test_fft16.c
diff --git a/third_party/openmax_dl/dl/sp/src/test/test_fft16.c b/third_party/openmax_dl/dl/sp/src/test/test_fft16.c
new file mode 100644
index 0000000000000000000000000000000000000000..081bf23247525bd8f15bbd78c93820a2d1905087
--- /dev/null
+++ b/third_party/openmax_dl/dl/sp/src/test/test_fft16.c
@@ -0,0 +1,364 @@
+/*
+ *  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 <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/compare.h"
+#include "dl/sp/src/test/gensig.h"
+#include "dl/sp/src/test/test_util.h"
+
+#define MAX_FFT_ORDER   12
+
+int verbose = 0;
+int signal_value = 1024;
+int scale_factor = 0;
+
+struct KnownTestFailures known_failures[] = {
+    {11, 0, 1},
+    {11, 0, 2},
+    {11, 0, 3},
+    {12, 0, 1},
+    {12, 0, 2},
+    {12, 0, 3},
+    { 6, 1, 3},
+    { 7, 1, 3},
+    { 8, 1, 3},
+    { 9, 1, 3},
+    {10, 1, 3},
+    {11, 1, 1},
+    {11, 1, 2},
+    {11, 1, 3},
+    {12, 1, 1},
+    {12, 1, 2},
+    {12, 1, 3},
+    /* Marker to terminate array */
+    {-1, 0, 0}
+};
+
+void TestFFT(int fftLogSize, int scale_factor, int signalType);
+
+void main(int argc, char* argv[]) {
+  struct Options options;
+
+  SetDefaultOptions(&options, 0, MAX_FFT_ORDER);
+
+  options.signal_value_ = signal_value;
+  options.scale_factor_ = scale_factor;
+
+  ProcessCommandLine(&options, argc, argv,
+                     "Test forward and inverse 16-bit fixed-point FFT\n");
+
+  verbose = options.verbose_;
+  signal_value = options.signal_value_;
+  scale_factor = options.scale_factor_;
+
+  if (verbose > 255)
+    DumpOptions(stderr, &options);
+
+  if (options.test_mode_) {
+    struct TestInfo info;
+
+    info.real_only_ = options.real_only_;
+    info.max_fft_order_ = options.max_fft_order_;
+    info.min_fft_order_ = options.min_fft_order_;
+    info.do_forward_tests_ = options.do_forward_tests_;
+    info.do_inverse_tests_ = options.do_inverse_tests_;
+    info.known_failures_ = known_failures;
+    /*
+     * These SNR threshold values critically depend on the
+     * signal_value that is set for the tests!
+     */
+    info.forward_threshold_ = 33.01;
+    info.inverse_threshold_ = 35.59;
+
+    RunAllTests(&info);
+  } else {
+    TestFFT(options.fft_log_size_,
+            options.signal_type_,
+            options.scale_factor_);
+  }
+}
+
+void GenerateSignal(OMX_SC16* x, struct ComplexFloat* fft,
+                    struct ComplexFloat* x_true, int size, int sigtype,
+                    int scale_factor) {
+  int k;
+
+  GenerateTestSignalAndFFT(x_true, fft, size, sigtype, signal_value, 0);
+
+  /*
+   * Convert the complex result to what we want
+   */
+
+  for (k = 0; k < size; ++k) {
+    x[k].Re = 0.5 + x_true[k].Re;
+    x[k].Im = 0.5 + x_true[k].Im;
+  }
+}
+
+void DumpFFTSpec(OMXFFTSpec_C_SC16* pSpec) {
+  ARMsFFTSpec_SC16* p = (ARMsFFTSpec_SC16*) pSpec;
+  printf(" N = %d\n", p->N);
+  printf(" pBitRev  = %p\n", p->pBitRev);
+  printf(" pTwiddle = %p\n", p->pTwiddle);
+  printf(" pBuf     = %p\n", p->pBuf);
+}
+
+void TestFFT(int fft_log_size, int signal_type, int scale_factor) {
+  struct SnrResult snr;
+
+  RunOneForwardTest(fft_log_size, signal_type, signal_value, &snr);
+  printf("Forward float FFT\n");
+  printf("SNR:  real part    %f dB\n", snr.real_snr_);
+  printf("      imag part    %f dB\n", snr.imag_snr_);
+  printf("      complex part %f dB\n", snr.complex_snr_);
+
+  RunOneInverseTest(fft_log_size, signal_type, signal_value, &snr);
+  printf("Inverse float FFT\n");
+  printf("SNR:  real part    %f dB\n", snr.real_snr_);
+  printf("      imag part    %f dB\n", snr.imag_snr_);
+  printf("      complex part %f dB\n", snr.complex_snr_);
+}
+
+
+float RunOneForwardTest(int fft_log_size, int signal_type,
+                        float unused_signal_value,
+                        struct SnrResult* snr) {
+  OMX_SC16* x;
+  OMX_SC16* y;
+
+  struct AlignedPtr* x_aligned;
+  struct AlignedPtr* y_aligned;
+
+  struct ComplexFloat* x_true;
+  struct ComplexFloat* y_true;
+  OMX_SC16* y_scaled;
+
+  OMX_INT n, fft_spec_buffer_size;
+  OMXResult status;
+  OMXFFTSpec_C_SC16 * fft_fwd_spec = NULL;
+  int fft_size;
+
+  /*
+   * With 16-bit numbers, we need to be careful to use all of the
+   * available bits to get good accuracy.  Hence, set signal_value to
+   * the max 16-bit value (or close to it).
+   *
+   * To get good FFT results, also set the forward FFT scale factor
+   * to be the same as the order.  This was determined by
+   * experimentation, so be careful!
+   */
+  signal_value = 32767;
+  scale_factor = fft_log_size;
+
+  fft_size = 1 << fft_log_size;
+
+  status = omxSP_FFTGetBufSize_C_SC16(fft_log_size, &fft_spec_buffer_size);
+  if (verbose > 63) {
+    printf("bufSize = %d\n", fft_spec_buffer_size);
+  }
+
+  fft_fwd_spec = (OMXFFTSpec_C_SC16*) malloc(fft_spec_buffer_size);
+  status = omxSP_FFTInit_C_SC16(fft_fwd_spec, fft_log_size);
+  if (status) {
+    fprintf(stderr, "Failed to init forward FFT:  status = %d\n", status);
+    exit(1);
+  }
+
+  x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
+  y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
+
+  x = x_aligned->aligned_pointer_;
+  y = y_aligned->aligned_pointer_;
+
+  x_true = (struct ComplexFloat*) malloc(sizeof(*x_true) * fft_size);
+  y_true = (struct ComplexFloat*) malloc(sizeof(*y_true) * fft_size);
+  y_scaled = (OMX_SC16*) malloc(sizeof(*y_true) * fft_size);
+
+  GenerateSignal(x, y_true, x_true, fft_size, signal_type, scale_factor);
+
+  {
+    float scale = pow(2.0, fft_log_size);
+
+    for (n = 0; n < fft_size; ++n) {
+      y_scaled[n].Re = 0.5 + y_true[n].Re / scale;
+      y_scaled[n].Im = 0.5 + y_true[n].Im / scale;
+    }
+  }
+
+  if (verbose > 63) {
+    printf("Signal\n");
+    DumpArrayComplex16("x", fft_size, x);
+    printf("Expected FFT output\n");
+    DumpArrayComplex16("y", fft_size, y_scaled);
+  }
+
+  status = omxSP_FFTFwd_CToC_SC16_Sfs(x, y, fft_fwd_spec, scale_factor);
+  if (status) {
+    fprintf(stderr, "Forward FFT failed: status = %d\n", status);
+    exit(1);
+  }
+
+  if (verbose > 63) {
+    printf("FFT Output\n");
+    DumpArrayComplex16("y", fft_size, y);
+  }
+
+  CompareComplex16(snr, y, y_scaled, fft_size);
+
+  return snr->complex_snr_;
+}
+
+float RunOneInverseTest(int fft_log_size, int signal_type,
+                        float unused_signal_value,
+                        struct SnrResult* snr) {
+  OMX_SC16* x;
+  OMX_SC16* y;
+  OMX_SC16* z;
+  OMX_SC16* y_scaled;
+
+  struct AlignedPtr* x_aligned;
+  struct AlignedPtr* y_aligned;
+  struct AlignedPtr* z_aligned;
+  struct AlignedPtr* y_scaled_aligned;
+
+  struct ComplexFloat* x_true;
+  struct ComplexFloat* y_true;
+
+  OMX_INT n, fft_spec_buffer_size;
+  OMXResult status;
+  OMXFFTSpec_C_SC16 * fft_fwd_spec = NULL;
+  OMXFFTSpec_C_SC16 * fft_inv_spec = NULL;
+  int fft_size;
+
+  /*
+   * With 16-bit numbers, we need to be careful to use all of the
+   * available bits to get good accuracy.  Hence, set signal_value to
+   * the max 16-bit value (or close to it).
+   *
+   * To get good FFT results, also set the forward FFT scale factor
+   * to be the same as the order.  This was determined by
+   * experimentation, so be careful!
+   */
+  signal_value = 32767;
+
+  fft_size = 1 << fft_log_size;
+
+  status = omxSP_FFTGetBufSize_C_SC16(fft_log_size, &fft_spec_buffer_size);
+  if (verbose > 3) {
+    printf("bufSize = %d\n", fft_spec_buffer_size);
+  }
+
+  fft_inv_spec = (OMXFFTSpec_C_SC16*)malloc(fft_spec_buffer_size);
+  status = omxSP_FFTInit_C_SC16(fft_inv_spec, fft_log_size);
+  if (status) {
+    fprintf(stderr, "Failed to init backward FFT:  status = %d\n", status);
+    exit(1);
+  }
+
+  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_scaled_aligned = AllocAlignedPointer(32, sizeof(*y_true) * fft_size);
+
+  x = x_aligned->aligned_pointer_;
+  y = y_aligned->aligned_pointer_;
+  z = z_aligned->aligned_pointer_;
+  y_scaled = y_scaled_aligned->aligned_pointer_;
+
+  y_true = (struct ComplexFloat*) malloc(sizeof(*y_true) * fft_size);
+  x_true = (struct ComplexFloat*) malloc(sizeof(*x_true) * fft_size);
+
+
+  GenerateSignal(x, y_true, x_true, fft_size, signal_type, fft_log_size);
+
+  {
+    /*
+     * To get max accuracy, scale the input to the inverse FFT up
+     * to use as many bits as we can.
+     */
+    float scale = 1;
+    float max = 0;
+
+    for (n = 0; n < fft_size; ++n) {
+      float val;
+      val = fabs(y_true[n].Re);
+      if (val > max) {
+        max = val;
+      }
+      val = fabs(y_true[n].Im);
+      if (val > max) {
+        max = val;
+      }
+    }
+
+    scale = 16384 / max;
+    if (verbose > 63)
+      printf("Inverse FFT input scaled factor %g\n", scale);
+
+    /*
+     * Scale both the true FFT signal and the input so we can
+     * compare them correctly later
+     */
+    for (n = 0; n < fft_size; ++n) {
+      y_scaled[n].Re = 0.5 + y_true[n].Re * scale;
+      y_scaled[n].Im = 0.5 + y_true[n].Im * scale;
+      x_true[n].Re *= scale;
+      x_true[n].Im *= scale;
+    }
+  }
+
+
+  if (verbose > 63) {
+    printf("Inverse FFT Input Signal\n");
+    DumpArrayComplex16("yScaled", fft_size, y_scaled);
+    printf("Expected Inverse FFT Output\n");
+    DumpArrayComplexFloat("x_true", fft_size, (OMX_FC32*) x_true);
+  }
+
+  status = omxSP_FFTInv_CToC_SC16_Sfs(y_scaled, z, fft_inv_spec, 0);
+
+  if (verbose > 7)
+    printf("Inverse FFT scaling = %d\n", status);
+
+  if (verbose > 127) {
+    printf("Raw Inverse FFT Output\n");
+    DumpArrayComplex16("z", fft_size, z);
+  }
+
+  /*
+   * The inverse FFT routine returns how much scaling was done. To
+   * compare the output with the expected output, we need to scale
+   * the expected output according to the scale factor returned.
+   */
+  for (n = 0; n < fft_size; ++n) {
+    x[n].Re = 0.5 + x_true[n].Re;
+    x[n].Im = 0.5 + x_true[n].Im;
+  }
+
+  if (verbose > 63) {
+    printf("Inverse FFT Output\n");
+    printf(" Actual\n");
+    DumpArrayComplex16("z", fft_size, z);
+    printf(" Expected (scaled)\n");
+    DumpArrayComplex16("x", fft_size, x);
+  }
+
+  CompareComplex16(snr, z, x, fft_size);
+
+  return snr->complex_snr_;
+}