UInt8 tapeReadHeader()
{
if (ramImageBuffer != NULL) {
UInt8 buf[32];
int i;
for (i = 0; i < tapeHeaderSize; i++) {
if (!tapeRead(buf + i)) {
return 0;
}
}
while (memcmp(buf, tapeHeader, tapeHeaderSize)) {
memmove(buf, buf + 1, tapeHeaderSize - 1);
if (!tapeRead(buf + tapeHeaderSize - 1)) {
return 0;
}
}
return 1;
}
return 0;
}
static UInt8 readA(SviPPI* ppi)
{
#if 1
// dvik: reverted to 2.8 since wav support is not finished yet
return boardCaptureUInt8(16, sviJoyIoReadTrigger(ppi->joyIO)) |
(boardGetCassetteInserted() ? 0:0x40);
#else
UInt8 value;
UInt8 casdat = 0;
value = boardCaptureUInt8(16, sviJoyIoReadTrigger(ppi->joyIO));
value |= boardGetCassetteInserted() ? 0:0x40;
tapeRead(&casdat);
value |= (casdat) ? 0:0x80;
dacWrite(ppi->dac, DAC_CH_MONO, (casdat & 0x01) ? 0 : 255);
return value;
#endif
}
int main(int argc, char* argv[])
{
FILE *output;
int8_t *buffer;
int32_t frequency,size,index,written;
float average;
int data,i,j;
bool header;
char *ifile = NULL;
char *ofile = NULL;
/* parse command line options */
for (i=1; i<argc; i++) {
if (argv[i][0]=='-') {
for(j=1;j && argv[i][j]!='\0';j++)
switch(argv[i][j]) {
case 'n': normalize=true; break;
case 'p': phase=false; break;
case 'w': window=atof(argv[++i]); j=-1; break;
case 't': threshold=atoi(argv[++i]); j=-1; break;
case 'e': envelope=atoi(argv[++i]); j=-1; break;
default:
fprintf(stderr,"%s: invalid option\n",argv[0]);
exit(1);
}
continue;
}
if (ifile==NULL) { ifile=argv[i]; continue; }
if (ofile==NULL) { ofile=argv[i]; continue; }
fprintf(stderr,"%s: invalid option\n",argv[0]);
exit(1);
}
if (ifile==NULL || ofile==NULL) { showUsage(argv[0]); exit(1); }
/* read the sample data and store it in buffer */
frequency=tapeRead(ifile,&buffer,&size);
if (frequency<0) {
fprintf(stderr,"%s: failed reading %s\n",argv[0],ifile);
exit(1);
}
/* open/create the output data file */
if ((output=fopen(ofile,"wb"))==NULL) {
fprintf(stderr,"%s: failed writing %s\n",argv[0],ofile);
exit(1);
}
/* work on signal first */
if (normalize) normalizeAmplitude(&buffer,size);
for(i=0;i<envelope;i++) correctEnvelope(&buffer,size);
/* let's do it */
printf("Decoding audio data...\n");
/* sample probably starts with some silence before the data, skip it */
written=index=0;
skipSilence(buffer,&index,size);
header=false;
/* loop through all audio data and extract the contents */
for (;index<size;index++) {
/* detect silent parts and skip them */
if (isSilence(buffer,index,size)) {
printf("[%.1f] skipping silence\n",(double)index/frequency);
skipSilence(buffer,&index,size);
}
/* detect header and proces the data block followed */
if (isHeader(buffer,index,size)) {
printf("[%.1f] header detected\n",(double)index/frequency);
average=skipHeader(buffer,&index,size);
/* write .cas header if none already written */
if (!header) {
/* .cas headers always start at fixed positions */
for (;written&7;written++) putc(0x00,output);
/* write a .cas header */
putc(0x1f,output); putc(0xa6,output);
putc(0xde,output); putc(0xba,output);
putc(0xcc,output); putc(0x13,output);
putc(0x7d,output); putc(0x74,output);
written+=8;
header=true;
}
printf("[%.1f] data block\n",(double)index/frequency);
while (!isSilence(buffer,index,size) && index<size) {
data=readByte(buffer,&index,size,average);
if (data>=0) { putc(data,output); written++; header=false; }
else break;
}
} else {
/* data found without a header, skip it */
printf("[%.1f] skipping headerless data\n",(double)index/frequency);
while(!isSilence(buffer,index,size) && index<size ) index++;
}
}
fclose(output);
free(buffer);
printf("All done...\n");
return 0;
}
