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- changed instrument lookup in MUS files.

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Based on evidence from several songs in Eternal Doom the description in all known documents is wrong. The instruments are not stored in a 16-bit word but in an 8-bit byte, followed by some variable size data.

Known variations are:

* second byte is 0 - no additional data follows
* second byte is 1 - a third byte for the 'bank' value follows.
This commit is contained in:
Christoph Oelckers 2015-12-30 19:13:28 +01:00
parent 8f149d9048
commit be6daf5d78
1 changed files with 22 additions and 7 deletions
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29
src/sound/music_mus_midiout.cpp
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@ -43,6 +43,7 @@
#include "doomdef.h"
#include "m_swap.h"
#include "files.h"
#include "s_sound.h"
// MACROS ------------------------------------------------------------------
@ -211,20 +212,34 @@ bool MUSSong2::CheckDone()
void MUSSong2::Precache()
{
WORD *work = (WORD *)alloca(MusHeader->NumInstruments * sizeof(WORD));
const WORD *used = (WORD *)MusHeader + sizeof(MUSHeader) / sizeof(WORD);
int i, j;
const BYTE *used = (BYTE *)MusHeader + sizeof(MUSHeader) / sizeof(BYTE);
int i, j, k;
for (i = j = 0; i < MusHeader->NumInstruments; ++i)
for (i = j = k = 0; i < MusHeader->NumInstruments; ++i)
{
WORD instr = LittleShort(used[i]);
BYTE instr = used[k++];
WORD val;
if (instr < 128)
{
work[j++] = instr;
val = instr;
}
else if (used[i] >= 135 && used[i] <= 181)
else if (instr >= 135 && instr <= 181)
{ // Percussions are 100-based, not 128-based, eh?
work[j++] = instr - 100 + (1 << 14);
val = instr - 100 + (1 << 14);
}
BYTE moreparam = used[k++];
if (moreparam == 1)
{
BYTE bank = used[k++];
val |= (bank << 7);
}
else if (moreparam > 0)
{
// No information if this is even valid. Print a message so it can be investigated later
Printf("Unknown instrument data found in music\n");
}
work[j++] = val;
}
MIDI->PrecacheInstruments(&work[0], j);
}