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authorfearlessTobi <thm.frey@gmail.com>2018-09-15 15:21:06 +0200
committerfearlessTobi <thm.frey@gmail.com>2018-09-15 15:21:06 +0200
commit63c2e32e207d31ecadd9022e1d7cd705c9febac8 (patch)
tree8a90e8ef2804f147dff7225a543a8740ecf7160c /src/audio_core/algorithm
parentMerge pull request #1310 from lioncash/kernel-ns (diff)
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Diffstat (limited to 'src/audio_core/algorithm')
-rw-r--r--src/audio_core/algorithm/filter.cpp12
-rw-r--r--src/audio_core/algorithm/filter.h4
-rw-r--r--src/audio_core/algorithm/interpolate.cpp12
-rw-r--r--src/audio_core/algorithm/interpolate.h4
4 files changed, 16 insertions, 16 deletions
diff --git a/src/audio_core/algorithm/filter.cpp b/src/audio_core/algorithm/filter.cpp
index 9fcd0614d..f65bf64f7 100644
--- a/src/audio_core/algorithm/filter.cpp
+++ b/src/audio_core/algorithm/filter.cpp
@@ -35,12 +35,12 @@ Filter::Filter(double a0, double a1, double a2, double b0, double b1, double b2)
: a1(a1 / a0), a2(a2 / a0), b0(b0 / a0), b1(b1 / a0), b2(b2 / a0) {}
void Filter::Process(std::vector<s16>& signal) {
- const size_t num_frames = signal.size() / 2;
- for (size_t i = 0; i < num_frames; i++) {
+ const std::size_t num_frames = signal.size() / 2;
+ for (std::size_t i = 0; i < num_frames; i++) {
std::rotate(in.begin(), in.end() - 1, in.end());
std::rotate(out.begin(), out.end() - 1, out.end());
- for (size_t ch = 0; ch < channel_count; ch++) {
+ for (std::size_t ch = 0; ch < channel_count; ch++) {
in[0][ch] = signal[i * channel_count + ch];
out[0][ch] = b0 * in[0][ch] + b1 * in[1][ch] + b2 * in[2][ch] - a1 * out[1][ch] -
@@ -54,14 +54,14 @@ void Filter::Process(std::vector<s16>& signal) {
/// Calculates the appropriate Q for each biquad in a cascading filter.
/// @param total_count The total number of biquads to be cascaded.
/// @param index 0-index of the biquad to calculate the Q value for.
-static double CascadingBiquadQ(size_t total_count, size_t index) {
+static double CascadingBiquadQ(std::size_t total_count, std::size_t index) {
const double pole = M_PI * (2 * index + 1) / (4.0 * total_count);
return 1.0 / (2.0 * std::cos(pole));
}
-CascadingFilter CascadingFilter::LowPass(double cutoff, size_t cascade_size) {
+CascadingFilter CascadingFilter::LowPass(double cutoff, std::size_t cascade_size) {
std::vector<Filter> cascade(cascade_size);
- for (size_t i = 0; i < cascade_size; i++) {
+ for (std::size_t i = 0; i < cascade_size; i++) {
cascade[i] = Filter::LowPass(cutoff, CascadingBiquadQ(cascade_size, i));
}
return CascadingFilter{std::move(cascade)};
diff --git a/src/audio_core/algorithm/filter.h b/src/audio_core/algorithm/filter.h
index a41beef98..3546d149b 100644
--- a/src/audio_core/algorithm/filter.h
+++ b/src/audio_core/algorithm/filter.h
@@ -30,7 +30,7 @@ public:
void Process(std::vector<s16>& signal);
private:
- static constexpr size_t channel_count = 2;
+ static constexpr std::size_t channel_count = 2;
/// Coefficients are in normalized form (a0 = 1.0).
double a1, a2, b0, b1, b2;
@@ -46,7 +46,7 @@ public:
/// Creates a cascading low-pass filter.
/// @param cutoff Determines the cutoff frequency. A value from 0.0 to 1.0.
/// @param cascade_size Number of biquads in cascade.
- static CascadingFilter LowPass(double cutoff, size_t cascade_size);
+ static CascadingFilter LowPass(double cutoff, std::size_t cascade_size);
/// Passthrough.
CascadingFilter();
diff --git a/src/audio_core/algorithm/interpolate.cpp b/src/audio_core/algorithm/interpolate.cpp
index 11459821f..3aea9b0f2 100644
--- a/src/audio_core/algorithm/interpolate.cpp
+++ b/src/audio_core/algorithm/interpolate.cpp
@@ -14,7 +14,7 @@
namespace AudioCore {
/// The Lanczos kernel
-static double Lanczos(size_t a, double x) {
+static double Lanczos(std::size_t a, double x) {
if (x == 0.0)
return 1.0;
const double px = M_PI * x;
@@ -37,15 +37,15 @@ std::vector<s16> Interpolate(InterpolationState& state, std::vector<s16> input,
}
state.nyquist.Process(input);
- constexpr size_t taps = InterpolationState::lanczos_taps;
- const size_t num_frames = input.size() / 2;
+ constexpr std::size_t taps = InterpolationState::lanczos_taps;
+ const std::size_t num_frames = input.size() / 2;
std::vector<s16> output;
- output.reserve(static_cast<size_t>(input.size() / ratio + 4));
+ output.reserve(static_cast<std::size_t>(input.size() / ratio + 4));
double& pos = state.position;
auto& h = state.history;
- for (size_t i = 0; i < num_frames; ++i) {
+ for (std::size_t i = 0; i < num_frames; ++i) {
std::rotate(h.begin(), h.end() - 1, h.end());
h[0][0] = input[i * 2 + 0];
h[0][1] = input[i * 2 + 1];
@@ -53,7 +53,7 @@ std::vector<s16> Interpolate(InterpolationState& state, std::vector<s16> input,
while (pos <= 1.0) {
double l = 0.0;
double r = 0.0;
- for (size_t j = 0; j < h.size(); j++) {
+ for (std::size_t j = 0; j < h.size(); j++) {
l += Lanczos(taps, pos + j - taps + 1) * h[j][0];
r += Lanczos(taps, pos + j - taps + 1) * h[j][1];
}
diff --git a/src/audio_core/algorithm/interpolate.h b/src/audio_core/algorithm/interpolate.h
index c79c2eef4..edbd6460f 100644
--- a/src/audio_core/algorithm/interpolate.h
+++ b/src/audio_core/algorithm/interpolate.h
@@ -12,8 +12,8 @@
namespace AudioCore {
struct InterpolationState {
- static constexpr size_t lanczos_taps = 4;
- static constexpr size_t history_size = lanczos_taps * 2 - 1;
+ static constexpr std::size_t lanczos_taps = 4;
+ static constexpr std::size_t history_size = lanczos_taps * 2 - 1;
double current_ratio = 0.0;
CascadingFilter nyquist;