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提升了位深度；增加了基于 Karplus-Strong 算法的拨弦乐器音色。
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@Jemtaly
Jemtaly authored Aug 7, 2023
1 parent bbab4ed commit 27dc7b0
Showing 1 changed file with 53 additions and 31 deletions.
84 changes: 53 additions & 31 deletions mu.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,9 @@
#define REC_TXT 2
#define REC_WAV 4
#define REC_TIM 8
#define BITS_T char
#define BITS_M 127
#define WAV_SR 44100
#define BITS_T uint16_t
#define BITS_M (1 << sizeof(BITS_T) * 7)
static std::string color_info, color_warn, color_err, color_end;
struct WavHead {
char riff_ID[4] = {'R', 'I', 'F', 'F'};
Expand Down Expand Up @@ -49,17 +49,19 @@ struct Tone {
int peri = WAV_SR / freq;
double A = TAU / WAV_SR * (freq + 0.0);
double B = TAU / WAV_SR * (freq + 5.0);
std::vector<BITS_T> wave(size, BITS_M);
std::vector<double> wave(size);
std::vector<BITS_T> data(size);
for (int i = 0; i < size; i++) {
wave[i] += fmin(1.0, fmin(i, size - i) / (0.02 * WAV_SR)) * BITS_M * (
not freq ? 0.0 :
t == '1' ? i % peri < peri / 2 ? -1.0 : 1.0 : // square
t == '2' ? (double)(abs(i % peri * 4 - peri * 2) - peri) / peri : // triangle
t == '3' ? (double)(abs(i % peri * 2 - peri * 0) - peri) / peri : // sawtooth
t >= '4' ? sin(A * i) * 0.6 - sin(B * i) * 0.4 : // beat
sin(A * i) * 1.0 - sin(B * i) * 0.0); // sine
wave[i] = not freq ? 0.0
: t == '0' ? sin(A * i) * 1.0 - sin(B * i) * 0.0 // sine
: t == '1' ? sin(A * i) * 0.6 - sin(B * i) * 0.4 // superimposed sine
: t == '2' ? i % peri < peri / 2 ? -1.0 : 1.0 // square
: t == '3' ? (double)(abs(i % peri * 4 - peri * 2) - peri) / peri // triangle
: t == '4' ? (double)(abs(i % peri * 2 - peri * 0) - peri) / peri // sawtooth
: i < peri ? rand() / (double)RAND_MAX * 2.0 - 1.0 : (wave[i - peri] + wave[i - peri + 1]) * 0.5; // karplus-strong
data[i] = fmin(0.999, fmin(i, size - i) / (0.02 * WAV_SR)) * wave[i] * BITS_M + BITS_M;
}
return wave;
return data;
}
};
class Passage {
Expand Down Expand Up @@ -97,45 +99,66 @@ class Passage {
for (int as, bs, c; c = input.get(), c != '|';) {
switch (c) {
case '1': case '2': case '3': case '4': case '5': case '6': case '7':
measure.push_back({crotchet, c, persist[c - '1']}); break;
measure.push_back({crotchet, c, persist[c - '1']});
break;
case ',': case '0':
measure.push_back({crotchet, c, 0}); break;
case '=':
if (measure.empty()) { throw std::runtime_error("'=' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'=' shouldn't appear at the beginning of a measure.");
}
measure.back().accidental = persist[measure.back().solfa - '1'] = 0; break;
case '#':
if (measure.empty()) { throw std::runtime_error("'#' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'#' shouldn't appear at the beginning of a measure.");
}
measure.back().accidental = persist[measure.back().solfa - '1'] = 1; break;
case 'b':
if (measure.empty()) { throw std::runtime_error("'b' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'b' shouldn't appear at the beginning of a measure.");
}
measure.back().accidental = persist[measure.back().solfa - '1'] = -1; break;
case '^':
if (measure.empty()) { throw std::runtime_error("'^' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'^' shouldn't appear at the beginning of a measure.");
}
measure.back().octave++; break;
case 'v':
if (measure.empty()) { throw std::runtime_error("'v' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'v' shouldn't appear at the beginning of a measure.");
}
measure.back().octave--; break;
case '-':
if (measure.empty()) { throw std::runtime_error("'-' shouldn't appear at the beginning of a measure, use ',' instead.");}
if (measure.empty()) {
throw std::runtime_error("'-' shouldn't appear at the beginning of a measure, use ',' instead.");
}
measure.back().value += crotchet; break;
case '/':
if (measure.empty()) { throw std::runtime_error("'/' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'/' shouldn't appear at the beginning of a measure.");
}
measure.back().value /= 2; break;
case '.':
if (measure.empty()) { throw std::runtime_error("'.' shouldn't appear at the beginning of a measure.");}
if (measure.empty()) {
throw std::runtime_error("'.' shouldn't appear at the beginning of a measure.");
}
measure.back().value *= Rational(1, 2 * (measure.back().value / crotchet).numerator()) + 1; break;
case '<':
crotchet /= 2; break;
case '>':
crotchet *= 2; break;
case '[':
input >> as; input.get(); // ':'
input >> bs; input.get(); // ']'
input >> as;
input.get(); // ':'
input >> bs;
input.get(); // ']'
tuplets.emplace(as, bs);
crotchet /= tuplets.top();
break;
case '!':
if (tuplets.empty()) { throw std::runtime_error("shouldn't close a tuplet that hasn't been opened.");}
if (tuplets.empty()) {
throw std::runtime_error("shouldn't close a tuplet that hasn't been opened.");
}
crotchet *= tuplets.top();
tuplets.pop(); break;
case EOF:
Expand All @@ -148,9 +171,7 @@ class Passage {
}
if (mval != Rational(metr.first, metr.second)) {
std::cerr << color_warn << "Warn: " << color_end
<< "the " << std::to_string(mctr)
+ "tsnrtttttt"[(mctr % 100) / 10 == 1 ? 0 : mctr % 10]
+ "htddhhhhhh"[(mctr % 100) / 10 == 1 ? 0 : mctr % 10] << " measure is irregular. "
<< "the " << std::to_string(mctr) + "tsnrtttttt"[(mctr % 100) / 10 == 1 ? 0 : mctr % 10] + "htddhhhhhh"[(mctr % 100) / 10 == 1 ? 0 : mctr % 10] << " measure is irregular. "
<< "(" << std::to_string(mval.numerator()) << "/" << std::to_string(mval.denominator()) << ")" << std::endl;
}
notes.insert(notes.end(), measure.begin(), measure.end());
Expand Down Expand Up @@ -239,7 +260,7 @@ int main(int argc, char *argv[]) {
}
int rec = 0;
char timbre = '0';
std::string txt_name = "-";
std::string txt_name = "-";
std::string wav_name = "a.wav";
for (int i = 1; (rec & REC_ERR) == 0 && i < argc; i++) {
if (argv[i][0] == '-') {
Expand Down Expand Up @@ -273,10 +294,11 @@ int main(int argc, char *argv[]) {
<< " FILE input file name" << std::endl
<< " -o OUTFILE output file name (default: a.wav)" << std::endl
<< " -t0 timbre: sine wave (default)" << std::endl
<< " -t1 timbre: square wave" << std::endl
<< " -t2 timbre: triangle wave" << std::endl
<< " -t3 timbre: sawtooth wave" << std::endl
<< " -t4 timbre: superimposed sine waves" << std::endl;
<< " -t1 timbre: superimposed sine waves" << std::endl
<< " -t2 timbre: square wave" << std::endl
<< " -t3 timbre: triangle wave" << std::endl
<< " -t4 timbre: sawtooth wave" << std::endl
<< " -t5 timbre: plucked string" << std::endl;
return 1;
}
try {
Expand Down

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