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This commit is contained in:
Keenan Tims
2020-01-06 14:38:25 -08:00
parent b0a7cd9fae
commit d1a57b09af
4 changed files with 465 additions and 50 deletions
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7
CMakeLists.txt Normal file → Executable file
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@@ -10,7 +10,12 @@ if(PULSEAUDIO_FOUND)
include_directories(${PULSEAUDIO_INCLUDE_DIR})
endif()
set(SINESYNTH_LIBS ${PULSEAUDIO_LIBRARY} pulse-simple)
find_package(Curses)
if (CURSES_FOUND)
include_directories(${CURSES_INCLUDE_DIRS})
endif()
set(SINESYNTH_LIBS ${PULSEAUDIO_LIBRARY} ${CURSES_LIBRARIES} pulse-simple tinfo)
file(GLOB SOURCES "src/*.cpp")

91
include/SineSynth.h Normal file → Executable file
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@@ -1,49 +1,106 @@
#pragma once
#include <cstdint>
#include <vector>
#include <iterator>
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <iterator>
#include <memory>
#include <string>
#include <vector>
using std::shared_ptr;
using std::vector;
using std::iterator_traits;
using std::sin;
using std::cos;
using std::for_each;
using std::sin;
class Generator
{
class Generator {
public:
virtual void getSamples(const uint16_t nSamples, float *buf) = 0;
virtual float getSample() = 0;
virtual void getSamples(size_t nSamples, float* buf);
virtual float getFrequency() const;
virtual void setFrequency(float _frequency);
virtual bool isEnabled() const;
virtual void enable();
virtual void disable();
virtual ~Generator();
// disallow copy of virtual interface
Generator(Generator const &) = delete;
Generator &operator=(Generator const &) = delete;
Generator(Generator const&) = delete;
Generator& operator=(Generator const&) = delete;
protected:
Generator(uint32_t _sampleRate, float _frequency, float _amplitude);
uint32_t sampleRate;
float frequency;
float amplitude;
bool enabled;
private:
};
class SineGenerator : public Generator
{
class SineGenerator : public Generator {
public:
SineGenerator(uint32_t _sampleRate, float _frequency, float _amplitude);
void getSamples(uint16_t nSamples, float *buf) final;
float getSample() final;
void setFrequency(float _frequency) final;
virtual ~SineGenerator();
private:
uint32_t tick;
float instPhase;
float phaseIncr;
};
class SineSynth
{
class NoiseGenerator : public Generator {
public:
NoiseGenerator(uint32_t _sampleRate, uint8_t rate, float _amplitude);
float getSample() final;
virtual ~NoiseGenerator();
uint8_t rate;
static const uint16_t rateTable[];
private:
vector<SineGenerator> generators;
int16_t level;
uint16_t sampleCount;
};
class SampleGenerator : public Generator {
public:
SampleGenerator(uint32_t _sampleRate, uint16_t _playbackRate, float _amplitude, size_t nSamples, const float* samples);
SampleGenerator(uint32_t _sampleRate, uint16_t _playbackRate, float _amplitude, size_t nSamples, const int16_t* samples);
float getSample() final;
virtual ~SampleGenerator();
uint16_t playbackRate;
private:
vector<float> sample;
float oldest, older, old;
uint32_t counter;
static const uint16_t gaussTable[];
};
class SineSynth {
public:
SineSynth(uint32_t _sampleRate);
void addSynth(shared_ptr<Generator>);
vector<shared_ptr<Generator>> getSynths() const;
void clearSynths();
void getSamples(size_t nSamples, float* buf);
private:
uint32_t sampleRate;
vector<shared_ptr<Generator>> generators;
};

204
src/SineSynth.cpp Normal file → Executable file
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@@ -2,27 +2,195 @@
#include <iostream>
Generator::Generator(uint32_t _sampleRate, float _frequency, float _amplitude) : sampleRate(_sampleRate), frequency(_frequency), amplitude(_amplitude)
Generator::Generator(uint32_t _sampleRate, float _frequency, float _amplitude)
: sampleRate(_sampleRate)
, frequency(_frequency)
, amplitude(_amplitude)
, enabled(false)
{
}
Generator::~Generator()
Generator::~Generator() {}
void Generator::getSamples(size_t nSamples, float* buf)
{
}
SineGenerator::SineGenerator(uint32_t _sampleRate, float _frequency, float _amplitude = 1) : Generator(_sampleRate, _frequency, _amplitude), tick(0) {
phaseIncr = 2 * M_PI * frequency / sampleRate;
std::cout << "Constructed SineGenerator with freq " << frequency << " phaseIncr " << phaseIncr << std::endl;
}
SineGenerator::~SineGenerator() {
}
void SineGenerator::getSamples(uint16_t nSamples, float *buf) {
for (;nSamples>0;nSamples--) {
std::cout << "Generating tick " << tick << std::endl;
*buf++ = cos(phaseIncr * tick++) * amplitude;
for (; nSamples > 0; nSamples--) {
*buf++ = getSample();
}
}
float Generator::getFrequency() const { return frequency; }
void Generator::setFrequency(float _frequency) { frequency = _frequency; }
bool Generator::isEnabled() const { return enabled; }
void Generator::enable() { enabled = true; }
void Generator::disable() { enabled = false; }
SineGenerator::SineGenerator(
uint32_t _sampleRate, float _frequency, float _amplitude = 1)
: Generator(_sampleRate, _frequency, _amplitude)
, instPhase(0)
{
setFrequency(_frequency);
enable();
std::cout << "Constructed SineGenerator with freq " << frequency
<< " phaseIncr " << phaseIncr << std::endl;
}
SineGenerator::~SineGenerator() {}
float SineGenerator::getSample()
{
if (instPhase > 2 * M_PI)
instPhase -= 2 * M_PI;
return cos(instPhase += phaseIncr) * amplitude;
}
void SineGenerator::setFrequency(float _frequency)
{
frequency = _frequency;
phaseIncr = 2 * M_PI * frequency / sampleRate;
}
SineSynth::SineSynth(uint32_t _sampleRate)
: sampleRate(_sampleRate)
{
}
void SineSynth::addSynth(shared_ptr<Generator> synth)
{
generators.push_back(synth);
}
vector<shared_ptr<Generator>> SineSynth::getSynths() const
{
return generators;
}
void SineSynth::clearSynths() { generators.resize(0); }
void SineSynth::getSamples(size_t nSamples, float* buf)
{
for (; nSamples > 0; nSamples--) {
*buf = 0;
for_each(std::begin(generators), std::end(generators),
[buf](std::shared_ptr<Generator> g) {
if (g->isEnabled())
*buf += g->getSample();
});
buf++;
}
}
const uint16_t NoiseGenerator::rateTable[]
= { 0, 2048, 1536, 1280, 1024, 768, 640, 512, 384, 320, 256, 192, 160, 128,
96, 80, 64, 48, 40, 32, 24, 20, 16, 12, 10, 8, 6, 5, 4, 3, 2, 1 };
NoiseGenerator::NoiseGenerator(
uint32_t _sampleRate, uint8_t _rate, float _amplitude)
: Generator(_sampleRate, 0, _amplitude)
, level(-0x4000)
, sampleCount(0)
, rate(_rate)
{
enable();
}
NoiseGenerator::~NoiseGenerator() {}
float NoiseGenerator::getSample()
{
if (rate == 0)
return 0;
if (sampleCount++ % rateTable[rate] == 0) {
auto retLevel = level;
level = ((level >> 1) & 0x3fff)
| (((level & 0x01) ^ ((level & 0x02) >> 1)) << 14);
return (retLevel / 32768.0f) * amplitude;
}
return (level / 32768.0f) * amplitude;
}
const uint16_t SampleGenerator::gaussTable[] = { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x1, 0x1, 0x1, 0x1,
0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2, 0x3, 0x3,
0x3, 0x3, 0x3, 0x4, 0x4, 0x4, 0x4, 0x4, 0x5, 0x5, 0x5, 0x5, 0x6, 0x6, 0x6,
0x6, 0x7, 0x7, 0x7, 0x8, 0x8, 0x8, 0x9, 0x9, 0x9, 0xa, 0xa, 0xa, 0xb, 0xb,
0xb, 0xc, 0xc, 0xd, 0xd, 0xe, 0xe, 0xf, 0xf, 0xf, 0x10, 0x10, 0x11, 0x11,
0x12, 0x13, 0x13, 0x14, 0x14, 0x15, 0x15, 0x16, 0x17, 0x17, 0x18, 0x18,
0x19, 0x1a, 0x1b, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21,
0x22, 0x23, 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x40, 0x41, 0x42, 0x43, 0x45, 0x46, 0x47,
0x49, 0x4a, 0x4c, 0x4d, 0x4e, 0x50, 0x51, 0x53, 0x54, 0x56, 0x57, 0x59,
0x5a, 0x5c, 0x5e, 0x5f, 0x61, 0x63, 0x64, 0x66, 0x68, 0x6a, 0x6b, 0x6d,
0x6f, 0x71, 0x73, 0x75, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84,
0x86, 0x89, 0x8b, 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9a, 0x9c, 0x9f,
0xa1, 0xa3, 0xa6, 0xa8, 0xab, 0xad, 0xaf, 0xb2, 0xb4, 0xb7, 0xba, 0xbc,
0xbf, 0xc1, 0xc4, 0xc7, 0xc9, 0xcc, 0xcf, 0xd2, 0xd4, 0xd7, 0xda, 0xdd,
0xe0, 0xe3, 0xe6, 0xe9, 0xec, 0xef, 0xf2, 0xf5, 0xf8, 0xfb, 0xfe, 0x101,
0x104, 0x107, 0x10b, 0x10e, 0x111, 0x114, 0x118, 0x11b, 0x11e, 0x122, 0x125,
0x129, 0x12c, 0x130, 0x133, 0x137, 0x13a, 0x13e, 0x141, 0x145, 0x148, 0x14c,
0x150, 0x153, 0x157, 0x15b, 0x15f, 0x162, 0x166, 0x16a, 0x16e, 0x172, 0x176,
0x17a, 0x17d, 0x181, 0x185, 0x189, 0x18d, 0x191, 0x195, 0x19a, 0x19e, 0x1a2,
0x1a6, 0x1aa, 0x1ae, 0x1b2, 0x1b7, 0x1bb, 0x1bf, 0x1c3, 0x1c8, 0x1cc, 0x1d0,
0x1d5, 0x1d9, 0x1dd, 0x1e2, 0x1e6, 0x1eb, 0x1ef, 0x1f3, 0x1f8, 0x1fc, 0x201,
0x205, 0x20a, 0x20f, 0x213, 0x218, 0x21c, 0x221, 0x226, 0x22a, 0x22f, 0x233,
0x238, 0x23d, 0x241, 0x246, 0x24b, 0x250, 0x254, 0x259, 0x25e, 0x263, 0x267,
0x26c, 0x271, 0x276, 0x27b, 0x280, 0x284, 0x289, 0x28e, 0x293, 0x298, 0x29d,
0x2a2, 0x2a6, 0x2ab, 0x2b0, 0x2b5, 0x2ba, 0x2bf, 0x2c4, 0x2c9, 0x2ce, 0x2d3,
0x2d8, 0x2dc, 0x2e1, 0x2e6, 0x2eb, 0x2f0, 0x2f5, 0x2fa, 0x2ff, 0x304, 0x309,
0x30e, 0x313, 0x318, 0x31d, 0x322, 0x326, 0x32b, 0x330, 0x335, 0x33a, 0x33f,
0x344, 0x349, 0x34e, 0x353, 0x357, 0x35c, 0x361, 0x366, 0x36b, 0x370, 0x374,
0x379, 0x37e, 0x383, 0x388, 0x38c, 0x391, 0x396, 0x39b, 0x39f, 0x3a4, 0x3a9,
0x3ad, 0x3b2, 0x3b7, 0x3bb, 0x3c0, 0x3c5, 0x3c9, 0x3ce, 0x3d2, 0x3d7, 0x3dc,
0x3e0, 0x3e5, 0x3e9, 0x3ed, 0x3f2, 0x3f6, 0x3fb, 0x3ff, 0x403, 0x408, 0x40c,
0x410, 0x415, 0x419, 0x41d, 0x421, 0x425, 0x42a, 0x42e, 0x432, 0x436, 0x43a,
0x43e, 0x442, 0x446, 0x44a, 0x44e, 0x452, 0x455, 0x459, 0x45d, 0x461, 0x465,
0x468, 0x46c, 0x470, 0x473, 0x477, 0x47a, 0x47e, 0x481, 0x485, 0x488, 0x48c,
0x48f, 0x492, 0x496, 0x499, 0x49c, 0x49f, 0x4a2, 0x4a6, 0x4a9, 0x4ac, 0x4af,
0x4b2, 0x4b5, 0x4b7, 0x4ba, 0x4bd, 0x4c0, 0x4c3, 0x4c5, 0x4c8, 0x4cb, 0x4cd,
0x4d0, 0x4d2, 0x4d5, 0x4d7, 0x4d9, 0x4dc, 0x4de, 0x4e0, 0x4e3, 0x4e5, 0x4e7,
0x4e9, 0x4eb, 0x4ed, 0x4ef, 0x4f1, 0x4f3, 0x4f5, 0x4f6, 0x4f8, 0x4fa, 0x4fb,
0x4fd, 0x4ff, 0x500, 0x502, 0x503, 0x504, 0x506, 0x507, 0x508, 0x50a, 0x50b,
0x50c, 0x50d, 0x50e, 0x50f, 0x510, 0x511, 0x511, 0x512, 0x513, 0x514, 0x514,
0x515, 0x516, 0x516, 0x517, 0x517, 0x517, 0x518, 0x518, 0x518, 0x518, 0x518,
0x519, 0x519 };
SampleGenerator::SampleGenerator(uint32_t _sampleRate, uint16_t _playbackRate,
float _amplitude, size_t nSamples, const float* samples)
: Generator(_sampleRate, 0, _amplitude)
, playbackRate(_playbackRate)
, counter(0)
{
oldest = older = old = 0;
enable();
sample.resize(nSamples);
for (auto i = std::begin(sample); i != std::end(sample); i++)
*i = *samples++;
}
SampleGenerator::~SampleGenerator() {}
float SampleGenerator::getSample()
{
counter += playbackRate;
if ((counter >> 12) > sample.size())
counter &= 0xfff;
auto gaussIndex = (counter >> 4) & 0x3f;
float out = ((gaussTable[0xff - gaussIndex] / 32768.0f * oldest) / 1024);
out += ((gaussTable[0x1ff - gaussIndex] / 32768.0f * older) / 1024);
out += ((gaussTable[0x100 + gaussIndex] / 32768.0f * old) / 1024);
out += ((gaussTable[0x000 + gaussIndex] / 32768.0f * sample[counter>>12]) / 1024);
out /= 2;
oldest = older;
older = old;
old = sample[counter>>12];
return out * amplitude;
}

213
src/main.cpp Normal file → Executable file
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@@ -1,23 +1,208 @@
#include <cmath>
#include <iostream>
#include <memory>
#include <string>
#include <curses.h>
#include <pulse/error.h>
#include <pulse/simple.h>
#include "SineSynth.h"
int main(int argc, char *argv[]) {
SineGenerator sg(44100, 440.0f, 0.1);
static const pa_sample_spec ss = {
.format = PA_SAMPLE_FLOAT32,
.rate = 44100,
.channels = 1
};
WINDOW* win;
pa_simple *s = NULL;
int error;
s = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &error);
constexpr int SAMPLERATE = 32000;
constexpr size_t BUFSIZE = 64;
float buf[1024];
for (;;) {
sg.getSamples(1024, buf);
pa_simple_write(s, buf, sizeof(buf), &error);
void majorChord(SineSynth& synth, const double root)
{
wprintw(win, "majorChord root: %f\n", root);
if (synth.getSynths().size() != 3) {
synth.clearSynths();
auto sg = std::make_shared<SineGenerator>(SAMPLERATE, root, 0.1);
synth.addSynth(sg);
sg = std::make_shared<SineGenerator>(
SAMPLERATE, root * pow(2, 4.0 / 12.0), 0.1);
synth.addSynth(sg);
sg = std::make_shared<SineGenerator>(
SAMPLERATE, root * pow(2, 7.0 / 12.0), 0.1);
synth.addSynth(sg);
} else {
auto synths = synth.getSynths();
synths[0]->setFrequency(root);
synths[1]->setFrequency(root * pow(2, 4.0 / 12.0));
synths[2]->setFrequency(root * pow(2, 7.0 / 12.0));
}
}
void minorChord(SineSynth& synth, const double root)
{
wprintw(win, "minorChord root: %f\n", root);
if (synth.getSynths().size() != 3) {
synth.clearSynths();
auto sg = std::make_shared<SineGenerator>(SAMPLERATE, root, 0.1);
synth.addSynth(sg);
sg = std::make_shared<SineGenerator>(
SAMPLERATE, root * pow(2, 3.0 / 12.0), 0.1);
synth.addSynth(sg);
sg = std::make_shared<SineGenerator>(
SAMPLERATE, root * pow(2, 7.0 / 12.0), 0.1);
synth.addSynth(sg);
} else {
auto synths = synth.getSynths();
synths[0]->setFrequency(root);
synths[1]->setFrequency(root * pow(2, 3.0 / 12.0));
synths[2]->setFrequency(root * pow(2, 7.0 / 12.0));
}
}
WINDOW*
init_curses()
{
WINDOW* win = initscr();
nodelay(win, TRUE);
keypad(win, TRUE);
cbreak();
return win;
}
pa_simple*
init_pulse()
{
static const pa_sample_spec ss = { .format = PA_SAMPLE_FLOAT32,
.rate = SAMPLERATE,
.channels = 1 };
int error = 0;
pa_simple* s = pa_simple_new(NULL,
"sinesynth",
PA_STREAM_PLAYBACK,
NULL,
"playback",
&ss,
NULL,
NULL,
&error);
if (error) {
std::cerr << "Error initializing PulseAudio: " << pa_strerror(error) << " ("
<< error << ")" << std::endl;
exit(-1);
}
return s;
}
const float testSample[] = { 0.0,
0.0980171403295606,
0.19509032201612825,
0.29028467725446233,
0.3826834323650898,
0.47139673682599764,
0.5555702330196022,
0.6343932841636455,
0.7071067811865475,
0.773010453362737,
0.8314696123025452,
0.8819212643483549,
0.9238795325112867,
0.9569403357322089,
0.9807852804032304,
0.9951847266721968,
1.0,
0.9951847266721969,
0.9807852804032304,
0.9569403357322089,
0.9238795325112867,
0.881921264348355,
0.8314696123025455,
0.7730104533627371,
0.7071067811865476,
0.6343932841636455,
0.5555702330196022,
0.47139673682599786,
0.3826834323650899,
0.2902846772544624,
0.1950903220161286,
0.09801714032956083,
1.2246467991473532e-16,
-0.09801714032956059,
-0.19509032201612836,
-0.2902846772544621,
-0.38268343236508967,
-0.47139673682599764,
-0.555570233019602,
-0.6343932841636453,
-0.7071067811865475,
-0.7730104533627367,
-0.8314696123025452,
-0.8819212643483549,
-0.9238795325112865,
-0.9569403357322088,
-0.9807852804032303,
-0.9951847266721969,
-1.0,
-0.9951847266721969,
-0.9807852804032304,
-0.9569403357322089,
-0.9238795325112866,
-0.881921264348355,
-0.8314696123025455,
-0.7730104533627369,
-0.7071067811865477,
-0.6343932841636459,
-0.5555702330196022,
-0.4713967368259979,
-0.3826834323650904,
-0.2902846772544625,
-0.19509032201612872,
-0.0980171403295605 };
int main(int argc, char* argv[])
{
SineSynth synth(SAMPLERATE);
auto noise = std::make_shared<NoiseGenerator>(SAMPLERATE, 0x1f, 0.1);
//synth.addSynth(noise);
auto sampled = std::make_shared<SampleGenerator>(SAMPLERATE, 0x1000, 0.1, sizeof(testSample)/sizeof(float), testSample);
synth.addSynth(sampled);
sampled->enable();
noise->disable();
auto s = init_pulse();
auto win = init_curses();
mvwprintw(win, 0, 0, "Initialized\n");
int error = 0;
pa_usec_t latency = pa_simple_get_latency(s, &error);
wprintw(win,
"Error: %s (%d) Latency: %d usec\n",
pa_strerror(error),
error,
latency);
float buf[BUFSIZE];
long long i;
mvwprintw(win, 2, 0, "Loops: ");
mvwprintw(win, 3, 0, "Rate: ");
for (i = 0;; i++) {
auto c = getch();
switch (c) {
case KEY_UP:
sampled->playbackRate+=8;
sampled->playbackRate &= 0x3fff;
break;
case KEY_DOWN:
sampled->playbackRate-=8;
sampled->playbackRate &= 0x3fff;
break;
}
synth.getSamples(BUFSIZE, buf);
pa_simple_write(s, buf, sizeof(buf), &error);
mvwprintw(win, 2, 8, "%d", i);
mvwprintw(win, 3, 7, "%2x", sampled->playbackRate);
}
endwin();
}