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Main.cpp
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Main.cpp
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/*------------------------------------
///\ Plywood C++ Framework
\\\/ https://plywood.arc80.com/
------------------------------------*/
#include <ply-codec/Muxer.h>
#include <ply-runtime/algorithm/Sort.h>
using namespace ply;
PLY_INLINE s16 floatToS16(float v) {
if (v >= 1.f)
return 32767;
else if (v < -1.f)
return -32768;
else
return s16(32767.f * v);
}
enum class VoiceType {
Square,
Triangle,
Noise,
Kick,
};
struct Voice {
virtual ~Voice() {
}
virtual bool play(const audio::Buffer& buf) = 0;
};
struct Voice_Tone : Voice {
VoiceType type = VoiceType::Square;
float pos = 0;
float step = 0;
float amplitude = 0.1f;
s32 duration = 0;
Voice_Tone(VoiceType type, float note, float duration, float amplitude) {
this->type = type;
this->step = 440.f * powf(2.f, (note - 9.f) / 12.f) / 44100.f;
this->duration = s32(duration * 44100.f);
this->amplitude = amplitude;
}
virtual bool play(const audio::Buffer& buf) override {
PLY_ASSERT(buf.format.numChannels == 1);
PLY_ASSERT(buf.format.sampleType == audio::Format::SampleType::S16);
PLY_ASSERT(buf.format.stride == 2);
PLY_ASSERT(buf.sampleRate == 44100.f);
s16* cur = (s16*) buf.samples;
s16* end = (s16*) buf.getEndPtr();
for (; cur < end; cur++) {
if (this->duration <= 0)
return false;
float value = 0.f;
if (this->type == VoiceType::Square) {
value = (this->pos < 0.5f ? 1.f : -1.f);
} else {
float x = fmodf(this->pos + 0.25f, 1.f);
value = (x < 0.5f ? x * 4.f : (1.f - x) * 4.f) - 1.f;
}
*cur += floatToS16(value * this->amplitude);
this->pos = fmodf(this->pos + this->step, 1.f);
this->duration--;
}
return true;
}
};
struct Voice_Noise : Voice {
float amplitude = 0.1f;
s32 duration = 0;
float w = 0;
Random random;
Voice_Noise(float duration, float amplitude) : random{0} {
this->duration = s32(duration * 44100.f);
this->amplitude = amplitude;
}
virtual bool play(const audio::Buffer& buf) override {
PLY_ASSERT(buf.format.numChannels == 1);
PLY_ASSERT(buf.format.sampleType == audio::Format::SampleType::S16);
PLY_ASSERT(buf.format.stride == 2);
PLY_ASSERT(buf.sampleRate == 44100.f);
s16* cur = (s16*) buf.samples;
s16* end = (s16*) buf.getEndPtr();
for (; cur < end; cur++) {
if (this->duration <= 0)
return false;
float value = 0.f;
float raw = this->random.nextFloat() * 2.f - 1.f;
this->w = mix(this->w, raw, 0.8f);
value = this->w;
*cur += floatToS16(value * this->amplitude);
this->duration--;
}
return true;
}
};
struct Voice_Kick : Voice {
float pos = 0;
float step = 0;
float amplitude = 0.1f;
Random random;
Voice_Kick(float duration, float amplitude) : random{0} {
this->step = 1.f / (duration * 44100.f);
this->amplitude = amplitude;
}
virtual bool play(const audio::Buffer& buf) override {
PLY_ASSERT(buf.format.numChannels == 1);
PLY_ASSERT(buf.format.sampleType == audio::Format::SampleType::S16);
PLY_ASSERT(buf.format.stride == 2);
PLY_ASSERT(buf.sampleRate == 44100.f);
s16* cur = (s16*) buf.samples;
s16* end = (s16*) buf.getEndPtr();
for (; cur < end; cur++) {
if (this->pos >= 1.f)
return false;
float value = 0.5f - cosf(this->pos * 2 * Pi) * 0.5f;
value *= (sinf(this->pos * 5 * Pi) + 0.2f * (this->random.nextFloat() * 2.f - 1.f));
*cur += floatToS16(value * this->amplitude);
this->pos += this->step;
}
return true;
}
};
struct Event {
float qTime;
VoiceType type;
float note;
float qDur;
float amplitude;
};
static constexpr float kofs = -0.17f;
static constexpr float rofs = -0.1f;
Array<Event> events = {
// clang-format off
// Melody
{0, VoiceType::Square, 16, 0.8f, 0.05f},
{0, VoiceType::Square, 16, 0.8f, 0.05f},
{0, VoiceType::Square, 6, 0.8f, 0.05f},
{1, VoiceType::Square, 16, 0.8f, 0.05f},
{1, VoiceType::Square, 6, 0.8f, 0.05f},
{3, VoiceType::Square, 16, 0.8f, 0.05f},
{3, VoiceType::Square, 6, 0.8f, 0.05f},
{5, VoiceType::Square, 12, 0.8f, 0.05f},
{5, VoiceType::Square, 6, 0.8f, 0.05f},
{6, VoiceType::Square, 16, 0.8f, 0.05f},
{6, VoiceType::Square, 6, 0.8f, 0.05f},
{8, VoiceType::Square, 19, 0.8f, 0.05f},
{8, VoiceType::Square, 11, 0.8f, 0.05f},
{12, VoiceType::Square, 7, 0.8f, 0.05f},
// Bass
{0, VoiceType::Triangle, -10, 0.8f, 0.22f},
{1, VoiceType::Triangle, -10, 0.8f, 0.22f},
{3, VoiceType::Triangle, -10, 0.8f, 0.22f},
{5, VoiceType::Triangle, -10, 0.8f, 0.22f},
{6, VoiceType::Triangle, -10, 0.8f, 0.22f},
{8, VoiceType::Triangle, 7, 0.8f, 0.22f},
{12, VoiceType::Triangle, -5, 0.8f, 0.22f},
// Kick
{0 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{1 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{2 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{3 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{5 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{6 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{8 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{11 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{13 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{14 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
{15 + kofs, VoiceType::Kick, 0, 0.25f, 0.1f},
// Rhythm
{0 + rofs, VoiceType::Noise, 0, 0.5f, 0.11f},
{2 + rofs, VoiceType::Noise, 0, 0.12f, 0.11f},
{3 + rofs, VoiceType::Noise, 0, 0.5f, 0.11f},
{5 + rofs, VoiceType::Noise, 0, 0.12f, 0.11f},
{6 + rofs, VoiceType::Noise, 0, 0.5f, 0.11f},
{8 + rofs, VoiceType::Noise, 0, 0.5f, 0.11f},
{11 + rofs, VoiceType::Noise, 0, 0.5f, 0.11f},
{13 + rofs, VoiceType::Noise, 0, 0.12f, 0.11f},
{14 + rofs, VoiceType::Noise, 0, 0.12f, 0.11f},
{15 + rofs, VoiceType::Noise, 0, 0.12f, 0.11f},
{16, VoiceType::Square, 0, 0.f, 0.f},
// clang-format on
};
int main() {
Owned<OutPipe> out = FileSystem::native()->openPipeForWrite("music-sample.mp3");
AudioOptions audioOpts;
Owned<Muxer> muxer = createMuxer(out, nullptr, &audioOpts, "mp3");
sort(events.view(), [](const Event& a, const Event& b) { return a.qTime < b.qTime; });
float secsPerBeat = 60.f / 100.f;
s32 sampleTime = s32(44100.f * events[0].qTime * (secsPerBeat * 0.25f));
Array<Owned<Voice>> voices;
u32 eventIdx = 0;
while (eventIdx < events.numItems()) {
audio::Buffer buffer;
muxer->beginAudioFrame(buffer);
memset(buffer.samples, 0, buffer.getSizeBytes());
u32 sampleOfs = 0;
while (sampleOfs < buffer.numSamples && eventIdx < events.numItems()) {
const Event* nextEvt = events.get(eventIdx);
s32 nextEventTime = s32(44100.f * nextEvt->qTime * (secsPerBeat * 0.25f));
s32 samplesToFill = min((s32) (buffer.numSamples - sampleOfs), (nextEventTime - sampleTime));
if (samplesToFill > 0) {
for (u32 i = 0; i < voices.numItems();) {
if (voices[i]->play(buffer.getSubregion(sampleOfs, samplesToFill))) {
i++;
} else {
voices.eraseQuick(i);
}
}
sampleTime += samplesToFill;
sampleOfs += samplesToFill;
} else {
if (nextEvt->type == VoiceType::Kick) {
voices.append(new Voice_Kick{nextEvt->qDur * (secsPerBeat * 0.25f),
nextEvt->amplitude * 0.9f});
} else if (nextEvt->type == VoiceType::Noise) {
voices.append(new Voice_Noise{nextEvt->qDur * (secsPerBeat * 0.25f),
nextEvt->amplitude * 0.9f});
} else {
voices.append(new Voice_Tone{nextEvt->type, nextEvt->note,
nextEvt->qDur * (secsPerBeat * 0.25f),
nextEvt->amplitude * 0.9f});
}
eventIdx++;
}
}
muxer->endAudioFrame(sampleOfs);
}
return 0;
}