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AUDIO: Generate note channel to track mapping for type 1 MIDI

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elasota 2022-07-01 18:43:56 -04:00 • committed by NMIError
parent 1792d727fa
commit b0644919d6
2 changed files with 9 additions and 1 deletions
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7
audio/midiparser_smf.cpp
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@ -29,6 +29,11 @@
static const byte commandLengths[8] = { 3, 3, 3, 3, 2, 2, 3, 0 };
static const byte specialLengths[16] = { 0, 2, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0 };
MidiParser_SMF::MidiParser_SMF(int8 source) : MidiParser(source), _buffer(nullptr) {
for (int i = 0; i < ARRAYSIZE(_noteChannelToTrack); i++)
_noteChannelToTrack[i] = -1;
}
MidiParser_SMF::~MidiParser_SMF() {
free(_buffer);
}
@ -295,6 +300,8 @@ uint32 MidiParser_SMF::compressToType0(byte *tracks[], byte numTracks, byte *buf
if (commandLengths[(event >> 4) - 8] > 0) {
copyBytes = commandLengths[(event >> 4) - 8];
if ((event & 0xf0) == MidiDriver_BASE::MIDI_COMMAND_NOTE_ON)
_noteChannelToTrack[event & 0x0f] = bestTrack;
} else if (specialLengths[(event & 0x0F)] > 0) {
copyBytes = specialLengths[(event & 0x0F)];
} else if (event == 0xF0) {

3
audio/midiparser_smf.h
View file

@ -30,6 +30,7 @@
class MidiParser_SMF : public MidiParser {
protected:
byte *_buffer;
int8 _noteChannelToTrack[16];
protected:
/**
@ -47,7 +48,7 @@ protected:
void parseNextEvent(EventInfo &info) override;
public:
MidiParser_SMF(int8 source = -1) : MidiParser(source), _buffer(nullptr) {}
MidiParser_SMF(int8 source = -1);
~MidiParser_SMF();
bool loadMusic(byte *data, uint32 size) override;