Skip to content

*.AMS Velvet Studio pattern decoding #86

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 3 commits into
base: master
Choose a base branch
from
Open

*.AMS Velvet Studio pattern decoding #86

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
6343e11
First byte in a row with value 0xff is special, meaning that the row …
mywave82 Mar 20, 2022
b2e8b04
First byte in a row with value 0xff is special for Extreme's Tracker …
mywave82 Mar 22, 2022
dadf705
Velvet Studio files would not parse correct if commands were provided…
mywave82 Mar 22, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
60 changes: 38 additions & 22 deletions src/load_ams.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,13 @@ BOOL CSoundFile::ReadAMS(LPCBYTE lpStream, DWORD dwMemLength)
while ((row < PatternSize[iPat]) && (i+2 < len))
{
BYTE b0 = p[i++];

if (b0 == 0xff)
{
row++;
continue;
}

BYTE b1 = p[i++];
BYTE b2 = 0;
UINT ch = b0 & 0x3F;
Expand Down Expand Up @@ -513,40 +520,49 @@ BOOL CSoundFile::ReadAMS2(LPCBYTE lpStream, DWORD dwMemLength)
{
MODCOMMAND *m = Patterns[ipat] + row * m_nChannels;
UINT byte1 = psrc[pos++];
UINT byte2;
UINT ch = byte1 & 0x1F;
if (byte1 == 0xff)
{
row++;
continue;
}

// Read Note + Instr
if (!(byte1 & 0x40))
{
UINT byte2 = psrc[pos++];
byte2 = psrc[pos++];
UINT note = byte2 & 0x7F;
if (note) m[ch].note = (note > 1) ? (note-1) : 0xFF;
m[ch].instr = psrc[pos++];
// Read Effect
while (byte2 & 0x80)
} else {
byte2 = 0x80; /* row contains atleast one effect, so trigged the first parse */
}
// Read Effect
while (byte2 & 0x80)
{
byte2 = psrc[pos++];
if (byte2 & 0x40)
{
byte2 = psrc[pos++];
if (byte2 & 0x40)
m[ch].volcmd = VOLCMD_VOLUME;
m[ch].vol = byte2 & 0x3F;
} else
{
UINT command = byte2 & 0x3F;
UINT param = psrc[pos++];
if (command == 0x0C)
{
m[ch].volcmd = VOLCMD_VOLUME;
m[ch].vol = byte2 & 0x3F;
m[ch].vol = param / 2;
} else
if (command < 0x10)
{
UINT command = byte2 & 0x3F;
UINT param = psrc[pos++];
if (command == 0x0C)
{
m[ch].volcmd = VOLCMD_VOLUME;
m[ch].vol = param / 2;
} else
if (command < 0x10)
{
m[ch].command = command;
m[ch].param = param;
ConvertModCommand(&m[ch]);
} else
{
// TODO: AMS effects
}
m[ch].command = command;
m[ch].param = param;
ConvertModCommand(&m[ch]);
} else
{
// TODO: AMS effects
}
}
}
Expand Down