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Sample Programs from NeXSTEP 3.3

/*
 * chaintest.c - this test shows how to chain sounds together, such that the
 * completion of one initiates another.
 */ 

#import <sound/sound.h>
#import <stdio.h>

#define BUF_SIZE 8192
#define BUF_MAX 8

static int buf_ptr, buf_max;
static SNDSoundStruct *buffers[BUF_MAX];

//
// The termination function gets called when the previously played sound 
// completes
//
int end(SNDSoundStruct *s, int tag, int err)
{
    if (err) fprintf(stderr,"error while playing sound %d\n",tag);
    if (buf_ptr < buf_max) {
	err = SNDStartPlaying(buffers[buf_ptr], buf_ptr, 5,0,0,end);
	if (err) fprintf(stderr,"cannot start playing %d (%s)\n",buf_ptr,
				SNDSoundError(err));
	buf_ptr++;
    }
}

main (int argc, char *argv[])
{
    int size, err, i, j;
    int x = 0;

    if (argc < 2) {
	fprintf(stderr,"usage: chaintest file ...\n");
	exit(1);
    }
    if (argc >= BUF_MAX) {
	fprintf(stderr,"too many files (max is %d)\n",BUF_MAX);
	exit(1);
    }
    
    //
    // read the soundfiles into the buffers
    //
    for (j=1; j<argc; j++) {
	err = SNDReadSoundfile(argv[j],&buffers[j]);
	if (err) {
	    fprintf(stderr,"Error : %s\n",SNDSoundError(err));
	    exit(1);
	}
    }
    
    //
    // Enqueue the first couple of files
    //
    buf_ptr = 1;
    buf_max = argc;
    for (j=1; j<3; j++) {
	err = SNDStartPlaying(buffers[j],buf_ptr++,5,0,0,end);
	if (err) {
	    fprintf(stderr,"Error : %s\n",SNDSoundError(err));
	    exit(1);
	}
    }

    //
    // wait for everything to complete
    //
    SNDWait(0);

    exit(0);
}

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