kernel_oscli

I’m trying to write a program that can make use of the ‘flac’ port to read chunks of data from a flac file and then analyse them. However I’m stopped by something I don’t understand about _kernel_oscli (Norcrof/Acorn compiler). So I hope someone can explain and suggest a solution… The code I’m using is as follows

int get_flac_chunk(int istep)
{
int isf;
sprintf(commandstring,“flac -d %s —skip %02d:%02d —until +00:05 —force-raw-format —endian=little —sign=signed -o %s”,infilename,fmins,fsecs,tempfilename);
printf(“command =\n %s\n\n”,commandstring);
fsecs+=istep;
if(fsecs>=60)
{
fsecs-=60;
fmins++;
}
_kernel_oscli(commandstring);
printf(“temp file made\n”);
rin.r⁰=5;
rin.r¹=(int)tempfilename;
kernel_swi(OSFile,&rin,&rout);
if(rout.r⁰==1)
{
isf=rout.r⁴;
printf(“Input file %d bytes long\n\n”,isf);
}
else
{
isf=0;
printf(“Input file does not exist!\n”);
}
return isf;
}

(Sorry, as usual the way, this forum engine ‘interprets’ text muddles the results a bit!)

The flac command gets acted upon and the output file of raw values appears. But the program (being run in a TaskWindow) halts. I don’t see the “temp file made” text or anything that follows to tell me the size of the saved data file.

So far as I can see, running the flac command with _kernel_oscli terminates the entire program which issued the command, so I can’t then examine the results with following code or proceed.

Can someone explain how I can ensure the process continues OK?

Failing that, anyone have code I can actually understand and use to DIY the flac decoding? I need this to be accurate (i.e. give the same results as flac and sox) and work with 16 and 24 bit flac files of any standard sample rate.

Jim

Please ignore the above! :-)

I posted again in a more relevant forum. Then promptly twigged how to solve my problem by using system() instead.

Jim