diff options
Diffstat (limited to 'src/GainControl.cpp')
| -rw-r--r-- | src/GainControl.cpp | 112 |
1 files changed, 96 insertions, 16 deletions
diff --git a/src/GainControl.cpp b/src/GainControl.cpp index 6304de3..a34dcf2 100644 --- a/src/GainControl.cpp +++ b/src/GainControl.cpp @@ -224,13 +224,26 @@ __m128 GainControl::computeGainVar(const __m128* in, size_t sizeIn) __m128 i128 = _mm_set1_ps(sample + 1); __m128 q128 = _mm_div_ps(delta128, i128); mean128.m = _mm_add_ps(mean128.m, q128); + + /* + tmp128.m = in[sample]; + printf("S %zu, %.2f+%.2fj\t", + sample, + tmp128.f[0], tmp128.f[1]); + printf(": %.2f+%.2fj\n", mean128.f[0], mean128.f[1]); + + printf("S %zu, %.2f+%.2fj\t", + sample, + tmp128.f[2], tmp128.f[3]); + printf(": %.2f+%.2fj\n", mean128.f[2], mean128.f[3]); + */ } // Merging average tmp128.m = _mm_shuffle_ps(mean128.m, mean128.m, _MM_SHUFFLE(1, 0, 3, 2)); mean128.m = _mm_add_ps(mean128.m, tmp128.m); mean128.m = _mm_mul_ps(mean128.m, _mm_set1_ps(0.5f)); - PDEBUG("********** Mean: %10f, %10f, %10f, %10f **********\n", + PDEBUG("********** Mean: %10f + %10fj %10f + %10fj **********\n", mean128.f[0], mean128.f[1], mean128.f[2], mean128.f[3]); //////////////////////////////////////////////////////////////////////// @@ -243,16 +256,32 @@ __m128 GainControl::computeGainVar(const __m128* in, size_t sizeIn) __m128 i128 = _mm_set1_ps(sample + 1); __m128 q128 = _mm_div_ps(delta128, i128); var128.m = _mm_add_ps(var128.m, q128); + + /* + __u128 udiff128; udiff128.m = diff128; + __u128 udelta128; udelta128.m = delta128; + for (int off=0; off<4; off+=2) { + printf("S %zu, %.2f+%.2fj\t", + sample, + udiff128.f[off], udiff128.f[1+off]); + printf(": %.2f+%.2fj\t", udelta128.f[off], udelta128.f[1+off]); + printf(": %.2f+%.2fj\n", var128.f[off], var128.f[1+off]); + } + */ + } - // Merging average + PDEBUG("********** Vars: %10f + %10fj, %10f + %10fj **********\n", + var128.f[0], var128.f[1], var128.f[2], var128.f[3]); + + // Merging standard deviations tmp128.m = _mm_shuffle_ps(var128.m, var128.m, _MM_SHUFFLE(1, 0, 3, 2)); var128.m = _mm_add_ps(var128.m, tmp128.m); var128.m = _mm_mul_ps(var128.m, _mm_set1_ps(0.5f)); var128.m = _mm_sqrt_ps(var128.m); - PDEBUG("********** Var: %10f, %10f, %10f, %10f **********\n", + PDEBUG("********** Var: %10f + %10fj, %10f + %10fj **********\n", var128.f[0], var128.f[1], var128.f[2], var128.f[3]); var128.m = _mm_mul_ps(var128.m, _mm_set1_ps(4.0f)); - PDEBUG("********** 4*Var: %10f, %10f, %10f, %10f **********\n", + PDEBUG("********** 4*Var: %10f + %10fj, %10f + %10fj **********\n", var128.f[0], var128.f[1], var128.f[2], var128.f[3]); //////////////////////////////////////////////////////////////////////////// @@ -333,7 +362,17 @@ float GainControl::computeGainVar(const complexf* in, size_t sizeIn) { float gain; complexf mean; - complexf var; + + /* The variance calculation is a bit strange, because we + * emulate the exact same functionality as the SSE code, + * which is the most used one. + * + * TODO: verify that this actually corresponds to the + * gain mode suggested in EN 300 798 Clause 5.3 Numerical Range. + */ + complexf var1; + complexf var2; + static const float factor = 0x7fff; mean = complexf(0.0f, 0.0f); @@ -343,25 +382,66 @@ float GainControl::computeGainVar(const complexf* in, size_t sizeIn) float i = sample + 1; complexf q = delta / i; mean = mean + q; + + /* + printf("F %zu, %.2f+%.2fj\t", + sample, + in[sample].real(), in[sample].imag()); + + printf(": %.2f+%.2fj\n", mean.real(), mean.imag()); + */ } - PDEBUG("********** Mean: %10f, %10f **********\n", mean.real(), mean.imag()); + PDEBUG("********** Mean: %10f + %10fj **********\n", mean.real(), mean.imag()); //////////////////////////////////////////////////////////////////////// // Computing standard deviation //////////////////////////////////////////////////////////////////////// - var = complexf(0.0f, 0.0f); + var1 = complexf(0.0f, 0.0f); + var2 = complexf(0.0f, 0.0f); for (size_t sample = 0; sample < sizeIn; ++sample) { complexf diff = in[sample] - mean; - complexf delta = complexf(diff.real() * diff.real(), - diff.imag() * diff.imag()) - var; - float i = sample + 1; - complexf q = delta / i; - var = var + q; + complexf delta; + complexf q; + + float i = (sample/2) + 1; + if (sample % 2 == 0) { + delta = complexf(diff.real() * diff.real(), + diff.imag() * diff.imag()) - var1; + q = delta / i; + + var1 += q; + } + else { + delta = complexf(diff.real() * diff.real(), + diff.imag() * diff.imag()) - var2; + q = delta / i; + + var2 += q; + } + + /* + printf("F %zu, %.2f+%.2fj\t", + sample, + diff.real(), diff.imag()); + + printf(": %.2f+%.2fj\t", delta.real(), delta.imag()); + printf(": %.2f+%.2fj\t", var1.real(), var1.imag()); + printf(": %.2f+%.2fj\n", var2.real(), var2.imag()); + */ } - PDEBUG("********** Var: %10f, %10f **********\n", var.real(), var.imag()); + + PDEBUG("********** Vars: %10f + %10fj, %10f + %10fj **********\n", + var1.real(), var1.imag(), + var2.real(), var2.imag()); + + // Merge standard deviations in the same way the SSE version does it + complexf tmpvar = (var1 + var2) * 0.5f; + complexf var(sqrt(tmpvar.real()), sqrt(tmpvar.imag())); + PDEBUG("********** Var: %10f + %10fj **********\n", var.real(), var.imag()); + var = var * 4.0f; - PDEBUG("********** 4*Var: %10f, %10f **********\n", var.real(), var.imag()); + PDEBUG("********** 4*Var: %10f + %10fj **********\n", var.real(), var.imag()); //////////////////////////////////////////////////////////////////////////// // Computing gain @@ -372,10 +452,10 @@ float GainControl::computeGainVar(const complexf* in, size_t sizeIn) } // Detect NULL if ((int)var.real() == 0) { - gain = factor / var.real(); + gain = 1.0f; } else { - gain = 1.0f; + gain = factor / var.real(); } return gain; |