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- Added Gez's HMI/XMI division fixes, and partially the XMI tempo fix (not currently used).
SVN r3377 (trunk)
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parent
91ba2ec404
commit
170284ad57
3 changed files with 47 additions and 7 deletions
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@ -637,6 +637,7 @@ protected:
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int FindXMIDforms(const BYTE *chunk, int len, TrackInfo *songs) const;
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void FoundXMID(const BYTE *chunk, int len, TrackInfo *song) const;
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void ScanForTempo(const TrackInfo *song);
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bool SetMIDISubsong(int subsong);
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void DoInitialSetup();
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void DoRestart();
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@ -1,5 +1,5 @@
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/*
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** music_midi_midiout.cpp
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** music_hmi_midiout.cpp
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** Code to let ZDoom play HMI MIDI music through the MIDI streaming API.
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**
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**---------------------------------------------------------------------------
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@ -54,7 +54,7 @@
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}
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// In song header
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#define HMI_DIVISION_OFFSET 0xD2
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#define HMI_DIVISION_OFFSET 0xD4
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#define HMI_TRACK_COUNT_OFFSET 0xE4
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#define HMI_TRACK_DIR_PTR_OFFSET 0xE8
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@ -202,7 +202,10 @@ void HMISong::SetupForHMI(int len)
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}
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// The division is the number of pulses per quarter note (PPQN).
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Division = GetShort(MusHeader + HMI_DIVISION_OFFSET);
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// HMI files have two values here, a full value and a quarter value. Some games,
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// notably Quarantines, have identical values for some reason, so it's safer to
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// use the quarter value and multiply it by four than to trust the full value.
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Division = GetShort(MusHeader + HMI_DIVISION_OFFSET) << 2;
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InitialTempo = 4000000;
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Tracks = new TrackInfo[NumTracks + 1];
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@ -134,14 +134,16 @@ XMISong::XMISong (FILE *file, BYTE *musiccache, int len, EMidiDevice type)
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{
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return;
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}
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// The division is the number of pulses per quarter note (PPQN).
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// It is set by a specific MIDI event, but just in case these aren't used,
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// set a default value. Specs indicate it should be 120.
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Division = 120;
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Songs = new TrackInfo[NumSongs];
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memset(Songs, 0, sizeof(*Songs) * NumSongs);
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FindXMIDforms(MusHeader, len, Songs);
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CurrSong = Songs;
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DPrintf("XMI song count: %d\n", NumSongs);
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// The division is the number of pulses per quarter note (PPQN).
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Division = 60;
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DPrintf("Divisions: %d\n", Division);
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}
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//==========================================================================
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@ -198,6 +200,8 @@ int XMISong::FindXMIDforms(const BYTE *chunk, int len, TrackInfo *songs) const
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// IFF chunks are padded to even byte boundaries to avoid
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// unaligned reads on 68k processors.
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p += 8 + chunklen + (chunklen & 1);
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// Avoid crashes from corrupt chunks which indicate a negative size.
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if (chunklen < 0) p = len;
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}
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return count;
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}
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@ -233,6 +237,37 @@ void XMISong::FoundXMID(const BYTE *chunk, int len, TrackInfo *song) const
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}
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}
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//==========================================================================
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//
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// XMISong :: ScanForTempo
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//
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// Look through events chunk to find one that sets the tempo.
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//
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//==========================================================================
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void XMISong::ScanForTempo(const TrackInfo *song)
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{
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const BYTE *chunk = song->EventChunk;
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for (size_t q = 0; q < song->EventLen - 3; )
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{
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int r = q;
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int evmark = chunk[r];
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int evtype = chunk[r + 1];
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int evlen = chunk[r + 2];
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// Is it a tempo event? If so, length should be 3.
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if (evmark == MIDI_META && evtype == MIDI_META_TEMPO && evlen == 3)
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{
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// Tempo is given in microseconds per quarter notes, so for a base of
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// 120 per second, we have to divide by a million a multiply by 120 to
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// get the PPQN. This is simplified by 40 to manipulate smaller values.
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Tempo = (chunk[r + 3] << 16) | (chunk[r + 4] << 8) | chunk[r + 5];
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Division = Tempo * 3 / 25000;
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}
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q += 3 + evlen;
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}
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}
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//==========================================================================
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//
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// XMISong :: SetMIDISubsong
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@ -304,7 +339,7 @@ bool XMISong::CheckDone()
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//
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// XMISong :: MakeEvents
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//
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// Copies MIDI events from the SMF and puts them into a MIDI stream
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// Copies MIDI events from the XMI and puts them into a MIDI stream
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// buffer. Returns the new position in the buffer.
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//
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//==========================================================================
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@ -542,6 +577,7 @@ DWORD *XMISong::SendCommand (DWORD *events, EventSource due, DWORD delay)
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events[1] = 0;
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events[2] = (MEVT_TEMPO << 24) | Tempo;
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events += 3;
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Division = Tempo * 3 / 25000;
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break;
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}
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track->EventP += len;
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