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cwMidiFile.h/cpp : Added open_csv_2() to handle reading 'workshop' CSV files.

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This commit is contained in:
kevin 2025-04-21 09:29:22 -04:00
parent f1b7f1a263
commit 4558a2fcd7
2 changed files with 108 additions and 0 deletions
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105
cwMidiFile.cpp
View File

@ -1436,6 +1436,110 @@ errLabel:
return rc;
}
cw::rc_t cw::midi::file::open_csv_2( handle_t& hRef, const char* midi_csv_fname )
{
rc_t rc = kOkRC;
file_t* p = nullptr;
csv::handle_t csvH;
const char* titleA[] = { "UID","trk","dtick","atick","amicro","type","ch","D0","D1" };
unsigned titleN = sizeof(titleA)/sizeof(titleA[0]);
unsigned line_idx = 0;
unsigned lineN = 0;
unsigned trkN = 1;
unsigned trkIdx = 0;
unsigned TpQN = 1260;
unsigned BpM = 120;
if((rc = _create(hRef)) != kOkRC )
goto errLabel;
if((p = _handleToPtr(hRef)) == nullptr )
goto errLabel;
_init( p, trkN, TpQN );
if((rc = csv::create(csvH,midi_csv_fname,titleA,titleN)) != kOkRC )
{
rc = cwLogError(rc,"MIDI CSV file open failed.");
goto errLabel;
}
if((rc = line_count(csvH,lineN)) != kOkRC )
{
rc = cwLogError(rc,"MIDI CSV line count access failed.");
goto errLabel;
}
for(; (rc = next_line(csvH)) == kOkRC; ++line_idx )
{
unsigned uid;
unsigned amicro;
unsigned dtick;
unsigned atick;
const char* type = nullptr;
unsigned ch;
unsigned d0;
unsigned d1;
uint8_t status = 0;
if((rc = getv(csvH,"UID",uid,"dtick",dtick,"atick",atick,"amicro",amicro,"type",type,"ch",ch,"D0",d0,"D1",d1)) != kOkRC )
{
cwLogError(rc,"Error reading CSV line %i.",line_idx+1);
goto errLabel;
}
if(textIsEqual(type,"non"))
status = midi::kNoteOnMdId;
else
if(textIsEqual(type,"nof"))
status = midi::kNoteOffMdId;
else
if(textIsEqual(type,"ctl"))
status = midi::kCtlMdId;
else
if(textIsEqual(type,"tempo"))
{
// note the tempo is taken from the 'ch' column
if((rc = insertTrackTempoMsg(hRef, trkIdx, atick, ch )) != kOkRC )
{
rc = cwLogError(rc,"BPM insert failed.");
goto errLabel;
}
continue;
}
else
{
rc = cwLogError(kSyntaxErrorRC,"Unknown message type:'%s'.",cwStringNullGuard(type));
goto errLabel;
}
if( status != 0 )
{
assert( ch<=15 && d0 <= 127 && d1 <= 127 );
if((rc = insertTrackChMsg(hRef, trkIdx, atick, ch+status, d0, d1 )) != kOkRC )
{
rc = cwLogError(rc,"Channel msg insert failed.");
goto errLabel;
}
}
}
errLabel:
destroy(csvH);
if( rc == kEofRC )
rc = kOkRC;
if( rc != kOkRC )
rc = cwLogError(rc,"MIDI csv file parse failed on '%s'.",cwStringNullGuard(midi_csv_fname));
return rc;
}
cw::rc_t cw::midi::file::create( handle_t& hRef, unsigned trkN, unsigned ticksPerQN )
{
@ -1730,6 +1834,7 @@ cw::rc_t cw::midi::file::insertTrackMsg( handle_t h, unsigned trkIdx, const tra
// fill the track record
m->uid = p->nextUid++;
m->atick = msg->atick;
m->amicro = msg->amicro;
m->status = msg->status;
m->metaId = msg->metaId;
m->trkIdx = trkIdx;

3
cwMidiFile.h
View File

@ -121,6 +121,9 @@ namespace cw
// tpQN = ticks per quarter note should be given on the first line. (Defaults to 1260).
// bpm = beats per minute should be given on the first line. (Defaults to 60).
rc_t open_csv( handle_t& hRef, const char* csv_fname );
// Open MIDI CSV as generated by 'Workshop' recordings.
rc_t open_csv_2( handle_t& hRef, const char* csv_fname );
// Create an empty MIDI file object.
rc_t create( handle_t& hRef, unsigned trkN, unsigned ticksPerQN );