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// -*-C++-*-
// This file is part of the gmod package
// Copyright (C) 1997 by Andrew J. Robinson
#include <errno.h>
#include <string.h>
#include <asm/errno.h>
#include "xm.h"
#include "Sequencer.h"
int catchup(FILE *, int, int *);
void removeNoprint(char *);
int
XM_sample::load(Sequencer &seq, FILE * modFd, int sampleNo, int cutFactor,
void *pt, void *fp)
{
u_char header[214];
u_long headerSize, skipLength;
u_short numSamples;
int bytesRead = 0;
int readCount;
unsigned short *periodTable = (unsigned short *)pt;
int *filePos = (int *)fp;
ok_ = 0;
sampleNum_ = sampleNo;
readCount = fread(header, 1, 29, modFd);
*filePos += readCount;
if (readCount != 29)
return bytesRead;
strncpy(name_, (char *)(header + 4), 22);
name_[22] = '\0';
removeNoprint(name_);
headerSize = INTEL_LONG(header);
numSamples = INTEL_SHORT(header + 27);
if (numSamples > 0)
{
readCount = fread(header, 1, 214, modFd);
*filePos += readCount;
if (readCount != 214)
return bytesRead;
if (!catchup(modFd, *filePos + (headerSize - 243), filePos))
return bytesRead;
headerSize = INTEL_LONG(header);
volumeEnvelope.load(int(header[196]), int(header[198]), int(header[199]),
int(header[200]), int(header[204]),
(unsigned short)(INTEL_SHORT(header + 210)),
64, header + 100);
panEnvelope.load(int(header[197]), int(header[201]), int(header[202]),
int(header[203]), int(header[205]), 0, 32,
header + 148);
vibratoDepth_ = header[208];
vibratoRate_ = header[209];
readCount = fread(header, 1, 40, modFd);
*filePos += readCount;
if (readCount != 40)
return bytesRead;
if (!catchup(modFd, *filePos + (headerSize - 40), filePos))
return bytesRead;
skipLength = 0;
/* skip any remaining sample headers */
while(numSamples > 1)
{
readCount = fread(header + 40, 1, 40, modFd);
*filePos += readCount;
if (readCount != 40)
return bytesRead;
skipLength += INTEL_LONG(header + 40);
if (!catchup(modFd, *filePos + (headerSize - 40), filePos))
return bytesRead;
;
numSamples--;
}
length_ = INTEL_LONG(header);
loopStart = INTEL_LONG(header + 4);
loopEnd = loopStart + INTEL_LONG(header + 8);
if ((BYTE(header + 14) & 0x03) == 1)
mode_ = WAVE_LOOPING;
else if ((BYTE(header + 14) & 0x03) == 2)
mode_ = WAVE_LOOPING | WAVE_BIDIR_LOOP;
else
mode_ = 0;
if ((BYTE(header + 14) & 0x10) > 0)
mode_ |= WAVE_16_BITS;
panning_ = header[15];
// should check range of relative note!!
if (((signed char)(header[16])) != 0)
baseNote_ = 111978496 / periodTable[-((signed char)(header[16])) + 60 - NOTE_BASE];
else
baseNote_ = C2FREQ;
baseFreq_ = NTSC_RATE;
if (length_ > 0)
{
int rc;
rc = seq.patchLoad(modFd, sampleNo, *this, bytesRead,
cutFactor);
if (!rc)
ok_ = 1;
*filePos += bytesRead;
skipLength += length_ - bytesRead;
if (rc == -ENOSPC)
bytesRead = -bytesRead;
}
if (BYTE(header + 12) > 0)
volume_ = (BYTE(header + 12) * 4) - 1;
else
volume_ = 0;
finetune_ = (signed char)(BYTE(header + 13)) * 100 / 128;
/* skip any remaining samples for this instrument */
catchup(modFd, *filePos + skipLength, filePos);
}
else
catchup(modFd, *filePos + (headerSize - 29), filePos);
return bytesRead;
}
void
XM_sample::decode(char *data) const
{
signed short oldVal, newVal;
int i;
oldVal = 0;
if (mode_ & WAVE_16_BITS)
{
for (i = 0; i < length_; i+=2)
{
newVal = (signed short)(INTEL_SHORT(data + i)) + oldVal;
data[i] = newVal & 0x00ff;
data[i+1] = (newVal & 0xff00) >> 8;
oldVal = newVal;
}
}
else
{
for (i = 0; i < length_; i++)
{
newVal = (signed short)(data[i]) + oldVal;
data[i] = newVal;
oldVal = newVal;
}
}
}
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