maksw/midi
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allow to play OR synth to file

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maksw committed 2025-05-12 23:54:13 +02:00
1 parent d0cd0181a4
commit f50dd86e75
2 files changed
+57 -43
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main.cpp
+57 -43
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@@ -38,10 +38,11 @@ void WriteWAVHeader(std::ofstream &file, DWORD length) {
int main(int argc, char** argv) {
std::cout << "Program start\n";
if (argc != 3) {
if (argc != 4) {
std::cerr << "Wrong arguments!\n";
return -1;
}
bool synthToFile = std::strcmp(argv[3], "true") == 0;
// 1) Initialize BASS: default device, 44100 Hz, no flags
if (!BASS_Init(-1, 44100, 0, NULL, NULL)) {
@@ -57,9 +58,12 @@ int main(int argc, char** argv) {
return 1;
}
// Create decoding stream (no playback)
HSTREAM midiStream = BASS_MIDI_StreamCreateFile(FALSE, argv[2], 0, 0,
BASS_STREAM_DECODE | BASS_SAMPLE_FLOAT | BASS_MIDI_NOFX, 44100);
// Create decoding stream
DWORD flags = BASS_SAMPLE_FLOAT | BASS_MIDI_NOFX;
if (synthToFile)
flags |= BASS_STREAM_DECODE;
HSTREAM midiStream = BASS_MIDI_StreamCreateFile(FALSE, argv[2], 0, 0, flags, 44100);
if (!midiStream) {
std::cerr << "BASS_MIDI_StreamCreateFile error: " << BASS_ErrorGetCode() << std::endl;
BASS_MIDI_FontFree(sfont);
@@ -77,50 +81,60 @@ int main(int argc, char** argv) {
return 1;
}
std::ofstream wav("output.wav", std::ios::binary);
if (!wav) {
std::cerr << "Can't open output.wav for writing" << std::endl;
return 1;
}
WriteWAVHeader(wav, 0);
DWORD totalBytes = 0;
const int bufferSize = 44100 * 2 * sizeof(float); // 1 second float stereo
float buffer[44100 * 2];
std::cout << "Synthesis start\n";
QWORD totalRead = 0;
QWORD totalStreamLength = BASS_ChannelGetLength(midiStream, BASS_POS_BYTE);
auto lastUpdate = std::chrono::steady_clock::now();
while (true) {
int bytes = BASS_ChannelGetData(midiStream, buffer, bufferSize);
if (bytes <= 0) break;
short pcm[44100 * 2];
for (int i = 0; i < bytes / 4; ++i) {
float sample = buffer[i] * 32767.0f;
if (sample > 32767.0f) sample = 32767.0f;
if (sample < -32768.0f) sample = -32768.0f;
pcm[i] = static_cast<short>(sample);
if (!synthToFile) {
std::cout << "Playing live...\n";
if (!BASS_ChannelPlay(midiStream, FALSE)) {
std::cerr << "BASS_ChannelPlay error: " << BASS_ErrorGetCode() << std::endl;
BASS_StreamFree(midiStream);
BASS_MIDI_FontFree(sfont);
BASS_Free();
return 1;
}
wav.write(reinterpret_cast<const char*>(pcm), bytes / 2);
totalRead += bytes;
std::cout << "Press Enter to stop...\n";
std::cin.get(); // wait for user input
} else {
std::ofstream wav("output.wav", std::ios::binary);
if (!wav) {
std::cerr << "Can't open output.wav for writing" << std::endl;
return 1;
}
float percent = (totalStreamLength > 0) ? (100.0f * totalRead / totalStreamLength) : 0.0f;
printf("\rProgress: %.2f%%", percent);
WriteWAVHeader(wav, 0);
DWORD totalBytes = 0;
const int bufferSize = 44100 * 2 * sizeof(float);
float buffer[44100 * 2];
QWORD totalRead = 0;
QWORD totalStreamLength = BASS_ChannelGetLength(midiStream, BASS_POS_BYTE);
std::cout << "Synthesis start\n";
while (true) {
int bytes = BASS_ChannelGetData(midiStream, buffer, bufferSize);
if (bytes <= 0) break;
short pcm[44100 * 2];
for (int i = 0; i < bytes / 4; ++i) {
float sample = buffer[i] * 32767.0f;
if (sample > 32767.0f) sample = 32767.0f;
if (sample < -32768.0f) sample = -32768.0f;
pcm[i] = static_cast<short>(sample);
}
wav.write(reinterpret_cast<const char*>(pcm), bytes / 2);
totalBytes += bytes / 2;
totalRead += bytes;
float percent = (totalStreamLength > 0) ? (100.0f * totalRead / totalStreamLength) : 0.0f;
printf("\rProgress: %.2f%%", percent);
}
wav.seekp(0);
WriteWAVHeader(wav, totalBytes);
wav.close();
std::cout << "\nSynthesis end\n";
std::cout << "Exported to output.wav" << std::endl;
}
wav.seekp(0);
WriteWAVHeader(wav, totalBytes);
wav.close();
std::cout << "\nSynthesis end\n";
std::cout << "Exported to output.wav" << std::endl;
// 6) Clean up
BASS_StreamFree(midiStream); // free stream
BASS_MIDI_FontFree(sfont); // unload soundfont