zdoom/gzdoom
0
0
Fork 0
mirror of https://github.com/ZDoom/gzdoom.git synced 2024-11-11 15:21:51 +00:00
Code Issues Projects Releases Packages Wiki Activity

- changed instrument lookup in MUS files.

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

29
src/sound/music_mus_midiout.cpp
View file

@ -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);
}