// -------------------------
// Mid2StreamRewindConverter
// This little function is an adaptation of the ConverterInit() code which
// resets the tracks without closing and opening the file, thus reducing the
// time it takes to loop back to the beginning when looping.
// -------------------------
static BOOL Mid2StreamRewindConverter(VOID)
{
DWORD iTrack;
LPINTRACKSTATE pInTrack;
tkCurrentTime = 0;
// reset to start of midi file
ifs.iBytesLeft = ifs.FileSize;
ifs.pFilePointer = ifs.pFile;
for (iTrack = 0, pInTrack = ifs.pTracks; iTrack < ifs.nTracks; ++iTrack, ++pInTrack)
{
pInTrack->iBytesLeft = pInTrack->iTrackLen;
// Setup pointer to the current position in the track
pInTrack->pTrackPointer = pInTrack->pTrackData;
pInTrack->fdwTrack = 0;
pInTrack->bRunningStatus = BAD_MIDI_FIX;
pInTrack->tkNextEventDue = 0;
// Handle bozo MIDI files which contain empty track chunks
if (!pInTrack->iBytesLeft)
{
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
continue;
}
// We always preread the time from each track so the mixer code can
// determine which track has the next event with a minimum of work
if (!GetTrackVDWord(pInTrack, &pInTrack->tkNextEventDue))
{
I_OutputMsg("Read error while reading first delta time of track.\n");
return TRUE;
}
}
// End of track initialization code
return FALSE;
}
//
// GetTrackEvent
//
// Fills in the event struct with the next event from the track
//
// pteTemp->tkEvent will contain the absolute tick time of the event
// pteTemp->byShortData[0] will contain
// MIDI_META if the event is a meta event;
// in this case pteTemp->byShortData[1] will contain the meta class
// MIDI_SYSEX or MIDI_SYSEXEND if the event is a SysEx event
// Otherwise, the event is a channel message and pteTemp->byShortData[1]
// and pteTemp->byShortData[2] will contain the rest of the event.
//
// pteTemp->dwEventLength will contain
// The total length of the channel message in pteTemp->byShortData if
// the event is a channel message
// The total length of the paramter data pointed to by
// pteTemp->pLongData otherwise
//
// pteTemp->pLongData will point at any additional paramters if the
// event is a SysEx or meta event with non-zero length; else
// it will contain NULL
//
// Returns FALSE on success or TRUE on any kind of parse error
// Prints its own error message ONLY in the debug version
//
// Maintains the state of the input track (i.e. ptsTrack->dwLeftInBuffer,
// ptsTrack->pTrackPointers, and ptsTrack->byRunningStatus).
//
static BOOL GetTrackEvent( INTRACKSTATE *ptsTrack, PTEMPEVENT pteTemp )
{
DWORD idx;
BYTE byByte;
UINT dwEventLength;
// Clear out the temporary event structure to get rid of old data...
memset( pteTemp, 0, sizeof(TEMPEVENT));
// Already at end of track? There's nothing to read.
//
if(( ptsTrack->fdwTrack & ITS_F_ENDOFTRK )
|| ( !ptsTrack->dwLeftInBuffer && !ptsTrack->dwLeftOnDisk ))
return( TRUE );
// Get the first byte, which determines the type of event.
//
if( GetTrackByte( ptsTrack, &byByte ))
return( TRUE );
// If the high bit is not set, then this is a channel message
// which uses the status byte from the last channel message
// we saw. NOTE: We do not clear running status across SysEx or
// meta events even though the spec says to because there are
// actually files out there which contain that sequence of data.
//
if( !( byByte & 0x80 ))
{
// No previous status byte? We're hosed.
if( !ptsTrack->byRunningStatus )
{
TRACKERR(ptsTrack, gteBadRunStat);
return( TRUE );
}
pteTemp->byShortData[0] = ptsTrack->byRunningStatus;
pteTemp->byShortData[1] = byByte;
byByte = pteTemp->byShortData[0] & 0xF0;
pteTemp->dwEventLength = 2;
// Only program change and channel pressure events are 2 bytes long;
// the rest are 3 and need another byte
//
if(( byByte != MIDI_PRGMCHANGE ) && ( byByte != MIDI_CHANPRESS ))
{
if( !ptsTrack->dwLeftInBuffer && !ptsTrack->dwLeftOnDisk )
{
TRACKERR( ptsTrack, gteRunStatMsgTrunc );
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
return( TRUE );
}
if( GetTrackByte( ptsTrack, &pteTemp->byShortData[2] ))
return( TRUE );
++pteTemp->dwEventLength;
}
}
else if(( byByte & 0xF0 ) != MIDI_SYSEX )
{
// Not running status, not in SysEx range - must be
// normal channel message (0x80-0xEF)
//
pteTemp->byShortData[0] = byByte;
ptsTrack->byRunningStatus = byByte;
// Strip off channel and just keep message type
//
byByte &= 0xF0;
dwEventLength = ( byByte == MIDI_PRGMCHANGE || byByte == MIDI_CHANPRESS ) ? 1 : 2;
pteTemp->dwEventLength = dwEventLength + 1;
if(( ptsTrack->dwLeftInBuffer + ptsTrack->dwLeftOnDisk ) < dwEventLength )
{
TRACKERR( ptsTrack, gteChanMsgTrunc );
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
return( TRUE );
}
if( GetTrackByte( ptsTrack, &pteTemp->byShortData[1] ))
return( TRUE );
if( dwEventLength == 2 )
if( GetTrackByte( ptsTrack, &pteTemp->byShortData[2] ))
return( TRUE );
}
else if(( byByte == MIDI_SYSEX ) || ( byByte == MIDI_SYSEXEND ))
{
// One of the SysEx types. (They are the same as far as we're concerned;
// there is only a semantic difference in how the data would actually
// get sent when the file is played. We must take care to put the proper
// event type back on the output track, however.)
//
// Parse the general format of:
// BYTE bEvent (MIDI_SYSEX or MIDI_SYSEXEND)
// VDWORD cbParms
// BYTE abParms[cbParms]
//
pteTemp->byShortData[0] = byByte;
if( GetTrackVDWord( ptsTrack, &pteTemp->dwEventLength ))
{
TRACKERR( ptsTrack, gteSysExLenTrunc );
return( TRUE );
}
if(( ptsTrack->dwLeftInBuffer + ptsTrack->dwLeftOnDisk )
< pteTemp->dwEventLength )
{
TRACKERR( ptsTrack, gteSysExTrunc );
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
return( TRUE );
}
// Malloc a temporary memory block to hold the parameter data
if(( pteTemp->pLongData = malloc( pteTemp->dwEventLength )) == NULL )
{
TRACKERR( ptsTrack, gteNoMem );
return( TRUE );
}
// Copy from the input buffer to the parameter data buffer
for( idx = 0; idx < pteTemp->dwEventLength; idx++ )
if( GetTrackByte( ptsTrack, pteTemp->pLongData + idx ))
{
TRACKERR( ptsTrack, gteSysExTrunc );
return( TRUE );
}
// Increment our counter, which tells the program to look around for
// a malloc block to free, should it need to exit or reset before the
// block would normally be freed
dwMallocBlocks++;
}
else if( byByte == MIDI_META )
{
// It's a meta event. Parse the general form:
// BYTE bEvent (MIDI_META)
// BYTE bClass
// VDWORD cbParms
// BYTE abParms[cbParms]
//
pteTemp->byShortData[0] = byByte;
if( !ptsTrack->dwLeftInBuffer && !ptsTrack->dwLeftOnDisk )
{
TRACKERR(ptsTrack, gteMetaNoClass );
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
return( TRUE );
}
if( GetTrackByte( ptsTrack, &pteTemp->byShortData[1] ))
return( TRUE );
if( GetTrackVDWord( ptsTrack, &pteTemp->dwEventLength ))
{
TRACKERR( ptsTrack, gteMetaLenTrunc );
return( TRUE );
}
// NOTE: It's perfectly valid to have a meta with no data
// In this case, dwEventLength == 0 and pLongData == NULL
//
if( pteTemp->dwEventLength )
{
if(( ptsTrack->dwLeftInBuffer + ptsTrack->dwLeftOnDisk )
< pteTemp->dwEventLength )
{
TRACKERR( ptsTrack, gteMetaTrunc );
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
return( TRUE );
}
// Malloc a temporary memory block to hold the parameter data
if(( pteTemp->pLongData = malloc( pteTemp->dwEventLength ))
== NULL )
{
TRACKERR( ptsTrack, gteNoMem );
return( TRUE );
}
// Copy from the input buffer to the parameter data buffer
for( idx = 0; idx < pteTemp->dwEventLength; idx++ )
if( GetTrackByte( ptsTrack, pteTemp->pLongData + idx ))
{
TRACKERR( ptsTrack, gteMetaTrunc );
return( TRUE );
}
// Increment our counter, which tells the program to look around for
// a malloc block to free, should it need to exit or reset before the
// block would normally be freed
dwMallocBlocks++;
}
if( pteTemp->byShortData[1] == MIDI_META_EOT )
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
}
else
{
// Messages in this range are system messages and aren't supposed to
// be in a normal MIDI file. If they are, we've either misparsed or the
// authoring software is stupid.
//
return( TRUE );
}
// Event time was already stored as the current track time
//
pteTemp->tkEvent = ptsTrack->tkNextEventDue;
// Now update to the next event time. The code above MUST properly
// maintain the end of track flag in case the end of track meta is
// missing. NOTE: This code is a continuation of the track event
// time pre-read which is done at the end of track initialization.
//
if( !( ptsTrack->fdwTrack & ITS_F_ENDOFTRK ))
{
DWORD tkDelta;
if( GetTrackVDWord( ptsTrack, &tkDelta ))
return( TRUE );
ptsTrack->tkNextEventDue += tkDelta;
}
return( FALSE );
}
static BOOL RewindConverter( void )
{
DWORD dwToRead, cbRead, idx;
BOOL fRet;
PINTRACKSTATE ptsTrack;
tkCurrentTime = 0;
for( idx = 0, ptsTrack = ifs.pitsTracks; idx < ifs.dwTrackCount;
++idx, ++ptsTrack )
{
///////////////////////////////////////////////////////////////////////////////
// Here we need to determine if all track data will fit into a single one of
// our track buffers. If not, we need to read in a buffer full and come back
// for more later, saving the file offset to continue from and the amount left
// to read in the track structure.
// SetFilePointer( hInFile, ptsTrack->foTrackStart, NULL, FILE_BEGIN );
SetFilePointer2( ptsTrack->foTrackStart, NULL, FILE_BEGIN );
if( ptsTrack->dwTrackLength > TRACK_BUFFER_SIZE )
dwToRead = TRACK_BUFFER_SIZE;
else
dwToRead = ptsTrack->dwTrackLength;
/* if( !ReadFile( hInFile, ptsTrack->pTrackStart, dwToRead, &cbRead, NULL )
|| ( cbRead != dwToRead ))
{
MessageBox( GetActiveWindow(), szInitErrInFile,
"TEST", MB_OK | MB_ICONEXCLAMATION );
goto Rewind_Cleanup;
}*/
if( !ReadFile2( ptsTrack->pTrackStart, dwToRead, &cbRead, NULL )
|| ( cbRead != dwToRead ))
{
Con_Printf("MIDI: %s\n", szInitErrInFile);
goto Rewind_Cleanup;
}
// Save the number of bytes that didn't make it into the buffer
ptsTrack->dwLeftOnDisk = ptsTrack->dwTrackLength - cbRead;
ptsTrack->dwLeftInBuffer = cbRead;
// Save the current file offset so we can seek to it later
/* ptsTrack->foNextReadStart = SetFilePointer( hInFile, 0,
NULL, FILE_CURRENT );*/
ptsTrack->foNextReadStart = SetFilePointer2( 0,
NULL, FILE_CURRENT );
// Setup pointer to the current position in the track
ptsTrack->pTrackCurrent = ptsTrack->pTrackStart;
ptsTrack->fdwTrack = 0;
ptsTrack->byRunningStatus = 0;
ptsTrack->tkNextEventDue = 0;
// Handle bozo MIDI files which contain empty track chunks
//
if( !ptsTrack->dwLeftInBuffer && !ptsTrack->dwLeftOnDisk )
{
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
continue;
}
// We always preread the time from each track so the mixer code can
// determine which track has the next event with a minimum of work
//
if( GetTrackVDWord( ptsTrack, &ptsTrack->tkNextEventDue ))
{
Con_Printf("MIDI: %s\n", szInitErrInFile);
goto Rewind_Cleanup;
}
// Step over any unread data, advancing to the beginning of the next
// track's data
/* SetFilePointer( hInFile, ptsTrack->foTrackStart + ptsTrack->dwTrackLength,
NULL, FILE_BEGIN );*/
SetFilePointer2( ptsTrack->foTrackStart + ptsTrack->dwTrackLength,
NULL, FILE_BEGIN );
} // End of track initialization code
fRet = FALSE;
Rewind_Cleanup:
if( fRet )
return( TRUE );
return( FALSE );
}
// ConverterInit
//
// Open the input file
// Allocate and read the entire input file into memory
// Validate the input file structure
// Allocate the input track structures and initialize them
// Initialize the output track structures
//
// Return TRUE on success
// Prints its own error message if something goes wrong
//
BOOL ConverterInit( LPSTR szInFile )
{
BOOL fRet = TRUE;
DWORD cbRead, dwTag, cbHeader, dwToRead;
MIDIFILEHDR Header;
PINTRACKSTATE ptsTrack;
UINT idx;
tkCurrentTime = 0;
// Initialize things we'll try to free later if we fail
//
memset( &ifs, 0, sizeof(INFILESTATE));
ifs.cbFileLength = 0;
ifs.pitsTracks = NULL;
// Attempt to open the input and output files
//
MidiData = (byte *)COM_LoadHunkFile2((char *)szInFile, (int *)&ifs.cbFileLength);
if (!MidiData)
{
goto Init_Cleanup;
}
MidiOffset = 0;
MidiSize = ifs.cbFileLength;
/* hInFile = CreateFile( szInFile, GENERIC_READ,
FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if( hInFile == INVALID_HANDLE_VALUE )
{
wsprintf( szTemp, "Could not open \"%s\" for read.\n", szInFile );
MessageBox( GetActiveWindow(), szTemp,
"TEST", MB_OK | MB_ICONEXCLAMATION );
goto Init_Cleanup;
}
*/
// Figure out how big the input file is.
/* if((( ifs.cbFileLength = GetFileSize( hInFile, NULL )) == (UINT)-1 ))
{
MessageBox( GetActiveWindow(), "File system error on input file.\n",
"TEST", MB_OK | MB_ICONEXCLAMATION );
goto Init_Cleanup;
}*/
// Set up to read from the memory buffer. Read and validate
// - MThd header
// - size of file header chunk
// - file header itself
//
if( GetInFileData( &dwTag, sizeof(DWORD))
|| ( dwTag != MThd )
|| GetInFileData( &cbHeader, sizeof(DWORD))
|| (( cbHeader = DWORDSWAP( cbHeader )) < sizeof(MIDIFILEHDR))
|| GetInFileData( &Header, cbHeader ) )
{
Con_Printf("MIDI: %s\n",szInitErrInFile);
goto Init_Cleanup;
}
// File header is stored in hi-lo order. Swap this into Intel order and save
// parameters in our native int size (32 bits)
//
ifs.dwFormat = (DWORD)WORDSWAP( Header.wFormat );
ifs.dwTrackCount = (DWORD)WORDSWAP( Header.wTrackCount );
ifs.dwTimeDivision = (DWORD)WORDSWAP( Header.wTimeDivision );
// We know how many tracks there are; allocate the structures for them and parse
// them. The parse merely looks at the MTrk signature and track chunk length
// in order to skip to the next track header.
//
ifs.pitsTracks = (PINTRACKSTATE)GlobalAllocPtr( GPTR,
ifs.dwTrackCount * sizeof(INTRACKSTATE));
if( ifs.pitsTracks == NULL )
{
Con_Printf("MIDI: %s\n",szInitErrMem);
goto Init_Cleanup;
}
for( idx = 0, ptsTrack = ifs.pitsTracks; idx < ifs.dwTrackCount;
++idx, ++ptsTrack )
{
if(( ptsTrack->pTrackStart
= GlobalAllocPtr( GHND, TRACK_BUFFER_SIZE )) == NULL )
{
Con_Printf("MIDI: %s\n", szNoTrackBuffMem);
goto Init_Cleanup;
}
if( GetInFileData( &dwTag, sizeof(dwTag)) || ( dwTag != MTrk )
|| GetInFileData( &cbHeader, sizeof(cbHeader)))
{
Con_Printf("MIDI: %s\n", szInitErrInFile);
goto Init_Cleanup;
}
cbHeader = DWORDSWAP( cbHeader );
ptsTrack->dwTrackLength = cbHeader; // Total track length
///////////////////////////////////////////////////////////////////////////////
// Here we need to determine if all track data will fit into a single one of
// our track buffers. If not, we need to read in a buffer full and come back
// for more later, saving the file offset to continue from and the amount left
// to read in the track structure.
// Save the file offset of the beginning of this track
/* ptsTrack->foTrackStart = SetFilePointer( hInFile, 0, NULL,
FILE_CURRENT );*/
ptsTrack->foTrackStart = SetFilePointer2( 0, NULL,
FILE_CURRENT );
if( ptsTrack->dwTrackLength > TRACK_BUFFER_SIZE )
dwToRead = TRACK_BUFFER_SIZE;
else
dwToRead = ptsTrack->dwTrackLength;
/* if( !ReadFile( hInFile, ptsTrack->pTrackStart, dwToRead, &cbRead, NULL )
|| ( cbRead != dwToRead ))
{
MessageBox( GetActiveWindow(), szInitErrInFile,
"TEST", MB_OK | MB_ICONEXCLAMATION );
goto Init_Cleanup;
}*/
if( !ReadFile2( ptsTrack->pTrackStart, dwToRead, &cbRead, NULL )
|| ( cbRead != dwToRead ))
{
Con_Printf("MIDI: %s\n", szInitErrInFile);
goto Init_Cleanup;
}
// Save the number of bytes that didn't make it into the buffer
ptsTrack->dwLeftOnDisk = ptsTrack->dwTrackLength - cbRead;
ptsTrack->dwLeftInBuffer = cbRead;
// Save the current file offset so we can seek to it later
/* ptsTrack->foNextReadStart = SetFilePointer( hInFile, 0,
NULL, FILE_CURRENT );*/
ptsTrack->foNextReadStart = SetFilePointer2( 0,
NULL, FILE_CURRENT );
// Setup pointer to the current position in the track
ptsTrack->pTrackCurrent = ptsTrack->pTrackStart;
ptsTrack->fdwTrack = 0;
ptsTrack->byRunningStatus = 0;
ptsTrack->tkNextEventDue = 0;
// Handle bozo MIDI files which contain empty track chunks
//
if( !ptsTrack->dwLeftInBuffer && !ptsTrack->dwLeftOnDisk )
{
ptsTrack->fdwTrack |= ITS_F_ENDOFTRK;
continue;
}
// We always preread the time from each track so the mixer code can
// determine which track has the next event with a minimum of work
//
if( GetTrackVDWord( ptsTrack, &ptsTrack->tkNextEventDue ))
{
Con_Printf("MIDI: %s\n", szInitErrInFile);
goto Init_Cleanup;
}
// Step over any unread data, advancing to the beginning of the next
// track's data
/* SetFilePointer( hInFile, ptsTrack->foTrackStart + ptsTrack->dwTrackLength,
NULL, FILE_BEGIN );*/
SetFilePointer2( ptsTrack->foTrackStart + ptsTrack->dwTrackLength,
NULL, FILE_BEGIN );
} // End of track initialization code
fRet = FALSE;
Init_Cleanup:
if( fRet )
ConverterCleanup();
return( fRet );
}
/* GetTrackEvent
*
* Fills in the event struct with the next event from the track
*
* te->event_time will contain the absolute tick time of the event.
*
* te->shortdata[0] will contain:
* - MIDI_META_EVENT if the event is a meta event; in this case
* te->shortdata[1] will contain the meta class.
* - MIDICMD_SYSEX or MIDICMD_SYSEX_END if the event is a SysEx event
* - Otherwise, event is a channel message and te->shortdata[1] and
* te->shortdata[2] will contain the rest of the event.
*
* te->event_len will contain:
* - The total length of the channel message in te->shortdata if the
* event is a channel message,
* - The total length of the paramter data pointed to by te->longdata,
* otherwise.
*
* te->longdata will point at any additional paramters if the event is
* a SysEx or meta event with non-zero length; else it will be NULL.
*
* Returns zero on success or non-zero on any kind of parse error
* Maintains the state of the input track (i.e. ts->left_in_buffer,
* ts->pTrackPointers, and ts->running_status).
*/
static int GetTrackEvent (track_state_t *ts, temp_event_t *te)
{
DWORD idx;
BYTE b;
UINT event_len;
/* Clear out the temporary event structure to get rid of old data */
memset(te, 0, sizeof(struct _temp_event_s));
/* Already at end of track? There's nothing to read. */
if (ts->status & ITS_F_ENDOFTRK)
return 1;
if (!ts->left_in_buffer && !ts->left_on_disk)
return 1;
/* Get the first byte, which determines the type of event. */
if (GetTrackByte(ts, &b))
return 1;
/* If the high bit is not set, then this is a channel message
* which uses the status byte from the last channel message
* we saw. NOTE: We do not clear running status across SysEx or
* meta events even though the spec says to because there are
* actually files out there which contain that sequence of data.
*/
if ( !(b & 0x80))
{
/* No previous status byte? We're hosed. */
if (!ts->running_status)
{
TRACKERR(ts, err_bad_runstat);
return 1;
}
te->shortdata[0] = ts->running_status;
te->shortdata[1] = b;
b = te->shortdata[0] & 0xF0;
te->event_len = 2;
/* Only program change and channel pressure events are
* 2 bytes long. the rest are 3 and need another byte. */
if (b != MIDICMD_PGM_CHANGE && b != MIDICMD_CHANNEL_PRESSURE)
{
if (!ts->left_in_buffer && !ts->left_on_disk)
{
TRACKERR(ts, err_trunc_runstat);
ts->status |= ITS_F_ENDOFTRK;
return 1;
}
if (GetTrackByte(ts, &te->shortdata[2]))
return 1;
++te->event_len;
}
}
else if ((b & 0xF0) != MIDICMD_SYSEX)
{
/* Not running status, not in SysEx range - must be
* normal channel message (0x80-0xEF) */
te->shortdata[0] = b;
ts->running_status = b;
/* Strip off channel and just keep message type */
b &= 0xF0;
event_len = (b == MIDICMD_PGM_CHANGE || b == MIDICMD_CHANNEL_PRESSURE) ? 1 : 2;
te->event_len = event_len + 1;
if ((ts->left_in_buffer + ts->left_on_disk) < event_len)
{
TRACKERR(ts, err_trunc_chan_msg);
ts->status |= ITS_F_ENDOFTRK;
return 1;
}
if (GetTrackByte(ts, &te->shortdata[1]))
return 1;
if (event_len == 2)
{
if (GetTrackByte(ts, &te->shortdata[2]))
return 1;
}
}
else if (b == MIDICMD_SYSEX || b == MIDICMD_SYSEX_END)
{
/* One of the SysEx types. (They are the same as far as we're
* concerned; there is only a semantic difference in how the
* data would actually get sent when the file is played.
* We must take care to put the proper event type back on the
* output track, however.)
*
* Parse the general format of:
* BYTE event (MIDICMD_SYSEX or MIDICMD_SYSEX_END)
* VDWORD num_parms
* BYTE ab_parms[num_parms]
*/
te->shortdata[0] = b;
if (GetTrackVDWord(ts, &te->event_len))
{
TRACKERR(ts, err_trunc_sysex_len);
return 1;
}
if ((ts->left_in_buffer + ts->left_on_disk) < te->event_len)
{
TRACKERR(ts, err_trunc_sysex);
ts->status |= ITS_F_ENDOFTRK;
return 1;
}
te->longdata = (BYTE *) Z_Malloc(te->event_len, Z_MAINZONE);
for (idx = 0; idx < te->event_len; idx++)
{
if (GetTrackByte(ts, te->longdata + idx))
{
Z_Free(te->longdata);
te->longdata = NULL;
TRACKERR(ts, err_trunc_sysex);
return 1;
}
}
}
else if (b == MIDI_META_EVENT)
{
/* It's a meta event. Parse the general form:
* BYTE event (MIDI_META_EVENT)
* BYTE class
* VDWORD num_parms
* BYTE ab_parms[num_parms]
*/
te->shortdata[0] = b;
if (!ts->left_in_buffer && !ts->left_on_disk)
{
TRACKERR(ts, err_meta_noclass);
ts->status |= ITS_F_ENDOFTRK;
return 1;
}
if (GetTrackByte(ts, &te->shortdata[1]))
return 1;
if (GetTrackVDWord(ts, &te->event_len))
{
TRACKERR(ts, err_trunc_meta_len);
return 1;
}
/* NOTE: It's perfectly valid to have a meta with no data
* In this case, event_len == 0 and longdata == NULL */
if (te->event_len)
{
if ((ts->left_in_buffer + ts->left_on_disk) < te->event_len)
{
TRACKERR(ts, err_trunc_meta);
ts->status |= ITS_F_ENDOFTRK;
return 1;
}
te->longdata = (BYTE *) Z_Malloc(te->event_len, Z_MAINZONE);
for (idx = 0; idx < te->event_len; idx++)
{
if (GetTrackByte(ts, te->longdata + idx))
{
Z_Free(te->longdata);
te->longdata = NULL;
TRACKERR(ts, err_trunc_meta);
return 1;
}
}
}
if (te->shortdata[1] == MIDI_META_EOT)
ts->status |= ITS_F_ENDOFTRK;
}
else
{
/* Messages in this range are system messages and aren't
* supposed to be in a normal MIDI file. If they are, we
* have either misparsed or the authoring software is stupid.
*/
return 1;
}
/* Event time was already stored as the current track time */
te->event_time = ts->next_event_time;
/* Now update to the next event time. The code above MUST properly
* maintain the end of track flag in case the end of track meta is
* missing. NOTE: This code is a continuation of the track event
* time pre-read which is done at the end of track initialization.
*/
if ( !(ts->status & ITS_F_ENDOFTRK))
{
DWORD delta_time;
if (GetTrackVDWord(ts, &delta_time))
return 1;
ts->next_event_time += delta_time;
}
return 0;
}
/* RewindConverter
*
* An adaptation of the ConverterInit() code which resets the
* tracks without closing and opening the file.
*/
static int RewindConverter (void)
{
DWORD bytes_wanted, bytes_read, idx;
int err = 1;
track_state_t *ts;
currenttime = 0;
for (idx = 0, ts = mfs.tracks; idx < mfs.numtracks; ++idx, ++ts)
{
/* Determine whether all track data will fit into a single one of our track
* buffers. If not, we need to read in a buffer full and come back for more
* later, saving the file offset to continue from and the amount left to read
* in the track structure. */
MID2STREAM_seek(ts->start_ofs, SEEK_SET);
if (ts->length > TRACK_BUFFER_SIZE)
bytes_wanted = TRACK_BUFFER_SIZE;
else
bytes_wanted = ts->length;
MID2STREAM_readfile(ts->start_ptr, bytes_wanted, &bytes_read);
if (bytes_read != bytes_wanted)
goto Rewind_Cleanup;
/* Save the number of bytes that didn't make it into the buffer */
ts->left_on_disk = ts->length - bytes_read;
ts->left_in_buffer = bytes_read;
/* Save the current file offset so we can seek to it later */
ts->nextread_ofs = MID2STREAM_seek(0, SEEK_CUR);
/* Setup pointer to the current position in the track */
ts->current_ptr = ts->start_ptr;
ts->status = 0;
ts->running_status = 0;
ts->next_event_time = 0;
/* Handle bozo MIDI files which contain empty track chunks */
if (!ts->left_in_buffer && !ts->left_on_disk)
{
ts->status |= ITS_F_ENDOFTRK;
continue;
}
/* always preread the time from each track so the mixer code can
* determine which track has the next event with minimum work. */
if (GetTrackVDWord(ts, &ts->next_event_time))
goto Rewind_Cleanup;
/* Step over any unread data, advancing to the beginning of the next
* track's data */
MID2STREAM_seek(ts->start_ofs + ts->length, SEEK_SET);
} /* End of track initialization code */
err = 0;
Rewind_Cleanup:
if (err)
Con_Printf("MIDI: %s\n", err_bad_midi_file);
return err;
}
/* ConverterInit
*
* Open the input file
* Allocate and read the entire input file into memory
* Validate the input file structure
* Allocate the input track structures and initialize them
* Initialize the output track structures
*
* Return zero on success
*/
int ConverterInit (const char *filename)
{
int err = 1;
DWORD bytes_wanted, bytes_read, magic, bytes;
UINT idx;
midihdr_t header;
track_state_t *ts;
currenttime = 0;
memset (&mfs, 0, sizeof(midi_filestate_t));
memset (&midi_fh, 0, sizeof(fshandle_t));
if (MID2STREAM_fileopen(filename) != 0)
return 1;
mfs.length = midi_fh.length;
/* Read and validate MThd header, size of file header chunk
* and the file header itself. */
if (GetInFileData(&magic, sizeof(DWORD)))
goto Init_Cleanup;
magic = (DWORD)BigLong(magic);
if (magic == MIDI_MAGIC_RIFF) /* RMID ?? */
{
if (GetInFileData(&bytes, sizeof(DWORD)) != 0 || /* size */
GetInFileData(&magic, sizeof(DWORD)) != 0 ||
MIDI_MAGIC_RMID != (DWORD)BigLong(magic) ||
GetInFileData(&magic, sizeof(DWORD)) != 0 ||
/* "data" */0x64617461 != (DWORD)BigLong(magic) ||
GetInFileData(&bytes, sizeof(DWORD)) != 0 || /* size */
/* SMF must begin from here onwards: */
GetInFileData(&magic, sizeof(DWORD)) != 0) {
goto Init_Cleanup;
}
magic = (DWORD)BigLong(magic);
}
if (magic != MIDI_MAGIC_MTHD)
goto Init_Cleanup;
if (GetInFileData(&bytes, sizeof(DWORD)))
goto Init_Cleanup;
if ((bytes = (DWORD)BigLong(bytes)) < sizeof(midihdr_t))
goto Init_Cleanup;
if (GetInFileData(&header, bytes))
goto Init_Cleanup;
/* File header is stored in big endian (hi-lo) order. */
mfs.format = (DWORD) BigShort(header.format);
mfs.numtracks = (DWORD) BigShort(header.numtracks);
mfs.timediv = (DWORD) BigShort(header.timediv);
if (mfs.format != 0 && mfs.format != 1) /* Type-2 not supported */
goto Init_Cleanup;
if (mfs.numtracks == 0)
goto Init_Cleanup;
if (mfs.format == 0 && mfs.numtracks != 1)
goto Init_Cleanup;
/* We know how many tracks there are; allocate structures for them
* and parse them. The parse merely looks at the MTrk signature and
* track chunk length in order to skip to the next track header. */
mfs.tracks = (track_state_t *) Z_Malloc(mfs.numtracks * sizeof(track_state_t), Z_MAINZONE);
for (idx = 0, ts = mfs.tracks; idx < mfs.numtracks; ++idx, ++ts)
{
ts->start_ptr = (BYTE *) Z_Malloc(TRACK_BUFFER_SIZE, Z_MAINZONE);
if (GetInFileData(&magic, sizeof(magic)))
goto Init_Cleanup;
if ((magic = (DWORD)BigLong(magic)) != MIDI_MAGIC_MTRK)
goto Init_Cleanup;
if (GetInFileData(&bytes, sizeof(bytes)))
goto Init_Cleanup;
bytes = (DWORD)BigLong(bytes);
ts->length = bytes; /* Total track length */
/* Determine whether all track data will fit into a single one of our track
* buffers. If not, we need to read in a buffer full and come back for more
* later, saving the file offset to continue from and the amount left to read
* in the track structure. */
/* Save the file offset of the beginning of this track */
ts->start_ofs = MID2STREAM_seek(0, SEEK_CUR);
if (ts->length > TRACK_BUFFER_SIZE)
bytes_wanted = TRACK_BUFFER_SIZE;
else
bytes_wanted = ts->length;
MID2STREAM_readfile(ts->start_ptr, bytes_wanted, &bytes_read);
if (bytes_read != bytes_wanted)
goto Init_Cleanup;
/* Save the number of bytes that didn't make it into the buffer */
ts->left_on_disk = ts->length - bytes_read;
ts->left_in_buffer = bytes_read;
/* Save the current file offset so we can seek to it later */
ts->nextread_ofs = MID2STREAM_seek(0, SEEK_CUR);
/* Setup pointer to the current position in the track */
ts->current_ptr = ts->start_ptr;
ts->status = 0;
ts->running_status = 0;
ts->next_event_time = 0;
/* Handle bozo MIDI files which contain empty track chunks */
if (!ts->left_in_buffer && !ts->left_on_disk)
{
ts->status |= ITS_F_ENDOFTRK;
continue;
}
/* always preread the time from each track so the mixer code can
* determine which track has the next event with minimum work. */
if (GetTrackVDWord(ts, &ts->next_event_time))
goto Init_Cleanup;
/* Step over any unread data, advancing to the beginning of the next
* track's data */
MID2STREAM_seek(ts->start_ofs + ts->length, SEEK_SET);
} /* End of track initialization code */
err = 0;
Init_Cleanup:
if (err)
{
Con_Printf("MIDI: %s\n", err_bad_midi_file);
ConverterCleanup();
}
return err;
}
// -------------
// GetTrackEvent
//
// Fills in the event struct with the next event from the track
//
// pMe->tkEvent will contain the absolute tick time of the event
// pMe->abEvent[0] will contain
// MIDI_META if the event is a meta event;
// in this case pMe->abEvent[1] will contain the meta class
// MIDI_SYSEX or MIDI_SYSEXEND if the event is a SysEx event
// Otherwise, the event is a channel message and pMe->abEvent[1]
// and pMe->abEvent[2] will contain the rest of the event.
//
// pMe->dwEventLength will contain
// The total length of the channel message in pMe->abEvent if
// the event is a channel message
// The total length of the paramter data pointed to by
// pMe->pEvent otherwise
//
// pMe->pEvent will point at any additional paramters if the
// event is a SysEx or meta event with non-zero length; else
// it will contain NULL
//
// Returns TRUE on success or FALSE on any kind of parse error
// Prints its own error message ONLY in the debug version
//
// Maintains the state of the input track (i.e. pInTrack->iBytesLeft,
// pInTrack->pTrackPointers, and pInTrack->bRunningStatus).
// -------------
static BOOL GetTrackEvent(LPINTRACKSTATE pInTrack, LPTEMPEVENT pMe)
{
BYTE b;
UINT32 dwEventLength;
// Clear out the temporary event structure to get rid of old data...
ZeroMemory(pMe, sizeof (TEMPEVENT));
// Already at end of track? There's nothing to read.
//
if ((pInTrack->fdwTrack & ITS_F_ENDOFTRK) || !pInTrack->iBytesLeft)
return FALSE;
// Get the first BYTE, which determines the type of event.
//
b = *pInTrack->pTrackPointer++;
--pInTrack->iBytesLeft;
// If the high bit is not set, then this is a channel message
// which uses the status BYTE from the last channel message
// we saw. NOTE: We do not clear running status across SysEx or
// meta events even though the spec says to because there are
// actually files out there which contain that sequence of data.
//
if (!(b & 0x80))
{
// No previous status BYTE? We're hosed.
//
if (!pInTrack->bRunningStatus)
{
TRACKERR(pInTrack, gteBadRunStat);
return FALSE;
}
//faB: the last midi command issued on that track
pMe->abEvent[0] = pInTrack->bRunningStatus;
pMe->abEvent[1] = b; // the data !
b = (BYTE)(pMe->abEvent[0] & 0xF0);
pMe->dwEventLength = 2; //2 data bytes
// Only program change and channel pressure events are 2 BYTEs long;
// the rest are 3 and need another BYTE
//
if ((b != MIDI_PRGMCHANGE) && (b != MIDI_CHANPRESS))
{
if (!pInTrack->iBytesLeft)
{
TRACKERR(pInTrack, gteRunStatMsgTrunc);
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
return FALSE;
}
pMe->abEvent[2] = *pInTrack->pTrackPointer++;
--pInTrack->iBytesLeft;
++pMe->dwEventLength;
}
}
else if ((b & 0xF0) != MIDI_SYSEX)
{
// Not running status, not in SysEx range - must be
// normal channel message (0x80-0xEF)
pMe->abEvent[0] = b;
pInTrack->bRunningStatus = b;
// Strip off channel and just keep message type
//
b &= 0xF0;
dwEventLength = (b == MIDI_PRGMCHANGE || b == MIDI_CHANPRESS) ? 1 : 2;
pMe->dwEventLength = dwEventLength + 1;
if (pInTrack->iBytesLeft < dwEventLength)
{
TRACKERR(pInTrack, gteChanMsgTrunc);
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
return FALSE;
}
pMe->abEvent[1] = *pInTrack->pTrackPointer++;
if (dwEventLength == 2)
pMe->abEvent[2] = *pInTrack->pTrackPointer++;
pInTrack->iBytesLeft -= dwEventLength;
}
else if (b == MIDI_SYSEX || b == MIDI_SYSEXEND)
{
// One of the SysEx types. (They are the same as far as we're concerned;
// there is only a semantic difference in how the data would actually
// get sent when the file is played. We must take care to put the correct
// event type back on the output track, however.)
//
// Parse the general format of:
// BYTE bEvent (MIDI_SYSEX or MIDI_SYSEXEND)
// VLONG cbParms
// BYTE abParms[cbParms]
//
pMe->abEvent[0] = b;
if (!GetTrackVDWord(pInTrack, &pMe->dwEventLength))
{
TRACKERR(pInTrack, gteSysExLenTrunc);
return FALSE;
}
if (pInTrack->iBytesLeft < pMe->dwEventLength)
{
TRACKERR(pInTrack, gteSysExTrunc);
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
return FALSE;
}
pMe->pEvent = pInTrack->pTrackPointer;
pInTrack->pTrackPointer += pMe->dwEventLength;
pInTrack->iBytesLeft -= pMe->dwEventLength;
}
else if (b == MIDI_META)
{
// It's a meta event. Parse the general form:
// BYTE bEvent (MIDI_META)
// BYTE bClass
// VLONG cbParms
// BYTE abParms[cbParms]
//
pMe->abEvent[0] = b;
if (!pInTrack->iBytesLeft)
{
TRACKERR(pInTrack, gteMetaNoClass);
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
return FALSE;
}
pMe->abEvent[1] = *pInTrack->pTrackPointer++;
--pInTrack->iBytesLeft;
if (!GetTrackVDWord(pInTrack, &pMe->dwEventLength))
{
TRACKERR(pInTrack, gteMetaLenTrunc);
return FALSE;
}
// NOTE: Perfectly valid to have a meta with no data
// In this case, dwEventLength == 0 and pEvent == NULL
//
if (pMe->dwEventLength)
{
if (pInTrack->iBytesLeft < pMe->dwEventLength)
{
TRACKERR(pInTrack, gteMetaTrunc);
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
return FALSE;
}
pMe->pEvent = pInTrack->pTrackPointer;
pInTrack->pTrackPointer += pMe->dwEventLength;
pInTrack->iBytesLeft -= pMe->dwEventLength;
}
if (pMe->abEvent[1] == MIDI_META_EOT)
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
}
else
{
// Messages in this range are system messages and aren't supposed to
// be in a normal MIDI file. If they are, we've misparsed or the
// authoring software is stpuid.
#ifdef DEBUGMIDISTREAM
I_OutputMsg("System message not supposed to be in MIDI file..\n");
#endif
return FALSE;
}
// Event time was already stored as the current track time
//
pMe->tkEvent = pInTrack->tkNextEventDue;
// Now update to the next event time. The code above MUST properly
// maintain the end of track flag in case the end of track meta is
// missing.
if (!(pInTrack->fdwTrack & ITS_F_ENDOFTRK))
{
DWORD tkDelta;
if (!GetTrackVDWord(pInTrack, &tkDelta))
return FALSE;
pInTrack->tkNextEventDue += tkDelta;
}
return TRUE;
}
// ----
// Init (stand-alone version)
//
// Open the input and output files
// Allocate and read the entire input file into memory
// Validate the input file structure
// Allocate the input track structures and initialize them
// Initialize the output track structures
//
// Return TRUE on success
// Prints its own error message if something goes wrong
//
// ----
static BOOL Init(LPSTR szInFile, LPSTR szOutFile)
{
BOOL fRet = FALSE;
LONG cbRead;
UINT32 *pChunkID;
UINT32 *pChunkSize;
LONG iChunkSize;
LPMIDIFILEHDR pHeader;
LPINTRACKSTATE pInTrack;
UINT iTrack;
// Initialize things we'll try to free later if we fail
//
ifs.FileSize = 0;
ifs.pFile = NULL;
//ifs.pTracks = NULL;
// Attempt to open the input and output files
//
hInFile = CreateFileA(szInFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (INVALID_HANDLE_VALUE == hInFile)
{
I_OutputMsg("Could not open \"%s\" for read.\n", szInFile);
goto Init_Cleanup;
}
hOutFile = CreateFileA(szOutFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (INVALID_HANDLE_VALUE == hOutFile)
{
I_OutputMsg("Could not open \"%s\" for write.\n", szOutFile);
goto Init_Cleanup;
}
// Figure out how big the input file is and allocate a chunk of memory big enough
// to hold the whole thing. Read the whole file in at once.
//
if (INVALID_FILE_SIZE == (ifs.FileSize = GetFileSize(hInFile, NULL)))
{
I_OutputMsg("File system error on input file.\n");
goto Init_Cleanup;
}
if (NULL == (ifs.pFile = GlobalAllocPtr(GPTR, ifs.FileSize)))
{
I_OutputMsg("Out of memory.\n");
goto Init_Cleanup;
}
if ((!ReadFile(hInFile, ifs.pFile, ifs.FileSize, &cbRead, NULL)) ||
cbRead != ifs.FileSize)
{
I_OutputMsg("Read error on input file.\n");
goto Init_Cleanup;
}
// Set up to read from the memory buffer. Read and validate
// - MThd header
// - size of file header chunk
// - file header itself
//
ifs.iBytesLeft = ifs.FileSize;
ifs.pFilePointer = ifs.pFile;
// note: midi header size should always be 6
if ((pChunkID = (UINT32*)GetInFileData(sizeof (*pChunkID))) == NULL ||
*pChunkID != MThd ||
(pChunkSize = (UINT32*)GetInFileData(sizeof (*pChunkSize))) == NULL ||
(iChunkSize = LONGSWAP(*pChunkSize)) < sizeof (MIDIFILEHDR) ||
(pHeader = (LPMIDIFILEHDR)GetInFileData(iChunkSize)) == NULL)
{
I_OutputMsg("Read error on MIDI header.\n");
goto Init_Cleanup;
}
// File header is stored in hi-lo order. Swap this into Intel order and save
// parameters in our native int size (32 bits)
//
ifs.dwFormat = (LONG)WORDSWAP(pHeader->wFormat);
ifs.nTracks = (LONG)WORDSWAP(pHeader->nTracks);
ifs.dwTimeDivision = (LONG)WORDSWAP(pHeader->wTimeDivision);
#ifdef DEBUGMIDISTREAM
I_OutputMsg("MIDI Header:\n"
"------------\n"
"format: %d\n"
"number of tracks: %d\n"
"time division: %d\n", ifs.dwFormat, ifs.nTracks, ifs.dwTimeDivision);
#endif
// We know how many tracks there are; allocate the structures for them and parse
// them. The parse merely looks at the MTrk signature and track chunk length
// in order to skip to the next track header.
// faB: now static
// ifs.pTracks = (INTRACKSTATE *)GlobalAllocPtr(GPTR, ifs.nTracks*sizeof (INTRACKSTATE));
// if (ifs.pTracks == NULL)
// {
// I_OutputMsg("Out of memory.\n");
// goto Init_Cleanup;
// }
// faB: made it static, but don't quit if there are more tracks, just skip'em
// (this isn't really a limit, since 32 tracks are really the maximum for MIDI files)
if (ifs.nTracks > MAX_MIDI_IN_TRACKS)
ifs.nTracks = MAX_MIDI_IN_TRACKS;
for (iTrack = 0, pInTrack = ifs.pTracks; iTrack < ifs.nTracks; ++iTrack, ++pInTrack)
{
if ((pChunkID = (UINT32*)GetInFileData(sizeof (*pChunkID))) == NULL ||
*pChunkID!= MTrk ||
(pChunkSize = (UINT32*)GetInFileData(sizeof (*pChunkSize))) == NULL)
{
I_OutputMsg("Read error on track header.\n");
goto Init_Cleanup;
}
iChunkSize = LONGSWAP(*pChunkSize);
pInTrack->iTrackLen = iChunkSize;
pInTrack->iBytesLeft = iChunkSize;
pInTrack->pTrackData = GetInFileData(iChunkSize);
if (pInTrack->pTrackData == NULL)
{
I_OutputMsg("Read error while reading track data.\n");
goto Init_Cleanup;
}
#ifdef DEBUGMIDISTREAM
I_OutputMsg("Track %d : length %d bytes\n", iTrack, iChunkSize);
pInTrack->nTrack = iTrack;
#endif
pInTrack->pTrackPointer = pInTrack->pTrackData;
pInTrack->fdwTrack = 0;
pInTrack->bRunningStatus = 0;
// Handle bozo MIDI files which contain empty track chunks
//
if (!pInTrack->iBytesLeft)
{
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
continue;
}
// We always preread the time from each track so the mixer code can
// determine which track has the next event with a minimum of work
//
if (!GetTrackVDWord(pInTrack, &pInTrack->tkNextEventDue))
{
I_OutputMsg("Read error while reading first delta time of track.\n");
goto Init_Cleanup;
}
}
ots.tkTrack = 0;
ots.pFirst = NULL;
ots.pLast = NULL;
fRet = TRUE;
Init_Cleanup:
if (!fRet)
Cleanup();
return fRet;
}
// -----------------------
// Mid2StreamConverterInit
//
// Validate the input file structure
// Allocate the input track structures and initialize them (faB: now STATIC)
// Initialize the output track structures
//
// Return TRUE on success
// -----------------------
BOOL Mid2StreamConverterInit(LPBYTE pMidiData, size_t iMidiSize)
{
BOOL fRet = TRUE;
UINT32 *pChunkID;
UINT32 *pChunkSize;
UINT32 iChunkSize;
LPMIDIFILEHDR pHeader;
LPINTRACKSTATE pInTrack;
UINT iTrack;
tkCurrentTime = 0;
// Initialize things we'll try to free later if we fail
ZeroMemory(&ifs, sizeof (INFILESTATE));
//ifs.pTracks = NULL; //faB: now static
// Set up to read from the memory buffer. Read and validate
// - MThd header
// - size of file header chunk
// - file header itself
//
ifs.FileSize = iMidiSize;
ifs.pFile = pMidiData;
ifs.iBytesLeft = ifs.FileSize;
ifs.pFilePointer = ifs.pFile;
#ifdef DEBUGMIDISTREAM
I_OutputMsg("Midi file size: %d\n", iMidiSize);
#endif
// note: midi header size should always be 6
if ((pChunkID = (UINT32*)GetInFileData(sizeof (*pChunkID))) == NULL ||
*pChunkID != MThd ||
(pChunkSize = (UINT32*)GetInFileData(sizeof (*pChunkSize))) == NULL ||
(iChunkSize = LONGSWAP(*pChunkSize)) < sizeof (MIDIFILEHDR) ||
(pHeader = (LPMIDIFILEHDR)GetInFileData(iChunkSize)) == NULL)
{
I_OutputMsg("Read error on MIDI header.\n");
goto Init_Cleanup;
}
ifs.dwFormat = (LONG)WORDSWAP(pHeader->wFormat);
ifs.nTracks = (LONG)WORDSWAP(pHeader->nTracks);
ifs.dwTimeDivision = (LONG)WORDSWAP(pHeader->wTimeDivision);
#ifdef DEBUGMIDISTREAM
I_OutputMsg("MIDI Header:\n"
"------------\n"
"format: %d\n"
"number of tracks: %d\n"
"time division: %d\n", ifs.dwFormat, ifs.nTracks, ifs.dwTimeDivision);
#endif
/* faB: made static
ifs.pTracks = (INTRACKSTATE *)GlobalAllocPtr(GPTR, ifs.nTracks*sizeof (INTRACKSTATE));
if (ifs.pTracks == NULL)
{
I_OutputMsg("Out of memory.\n");
goto Init_Cleanup;
}
*/
// faB: made it static, but don't quit if there are more tracks, just skip'em
if (ifs.nTracks > MAX_MIDI_IN_TRACKS)
ifs.nTracks = MAX_MIDI_IN_TRACKS;
for (iTrack = 0, pInTrack = ifs.pTracks; iTrack < ifs.nTracks; ++iTrack, ++pInTrack)
{
if ((pChunkID = (UINT32*)GetInFileData(sizeof (*pChunkID))) == NULL ||
*pChunkID!= MTrk ||
(pChunkSize = (UINT32*)GetInFileData(sizeof (*pChunkSize))) == NULL)
{
I_OutputMsg("Read error on track header.\n");
goto Init_Cleanup;
}
iChunkSize = LONGSWAP(*pChunkSize);
pInTrack->iTrackLen = iChunkSize; // Total track length
pInTrack->iBytesLeft = iChunkSize;
pInTrack->pTrackData = GetInFileData(iChunkSize);
if (pInTrack->pTrackData == NULL)
{
I_OutputMsg("Read error while reading track data.\n");
goto Init_Cleanup;
}
#ifdef DEBUGMIDISTREAM
I_OutputMsg("Track %d : length %d bytes\n", iTrack, iChunkSize);
pInTrack->nTrack = iTrack;
#endif
// Setup pointer to the current position in the track
pInTrack->pTrackPointer = pInTrack->pTrackData;
pInTrack->fdwTrack = 0;
pInTrack->bRunningStatus = BAD_MIDI_FIX;
pInTrack->tkNextEventDue = 0;
// Handle bozo MIDI files which contain empty track chunks
if (!pInTrack->iBytesLeft)
{
pInTrack->fdwTrack |= ITS_F_ENDOFTRK;
continue;
}
// We always preread the time from each track so the mixer code can
// determine which track has the next event with a minimum of work
if (!GetTrackVDWord(pInTrack, &pInTrack->tkNextEventDue))
{
I_OutputMsg("Read error while reading first delta time of track.\n");
goto Init_Cleanup;
}
}
// End of track initialization code
fRet = FALSE;
Init_Cleanup:
if (fRet)
Mid2StreamConverterCleanup();
return fRet;
}
