void usage(void){  printf("ixjasync card1 card2 codec depth frame\n");  printf("\tcard1 and card2 - 0 = /dev/ixj0, 1 = /dev/ixj1 etc.\n");  printf("\tcodec  1 = g.723.1 6.3\n");  printf("\t       2 = g.723.1 5.3\n");  printf("\t       3 = TrueSpeech 8.5\n");  printf("\t       4 = TrueSpeech 4.8\n");  printf("\t       5 = TrueSpeech 4.1\n");  printf("\t       6 = g.728\n");  printf("\t       7 = g.729\n");  printf("\t       8 = uLaw\n");  printf("\t       9 = aLaw\n");  printf("\t      10 = Linear 16 Bit\n");  printf("\t      11 = Linear 8 Bit\n");  printf("\t      12 = Windows Sound System\n");  printf("\tdepth - DSP buffer depth in frames\n");  printf("\tframe - 10 = 10ms, 20 = 20ms, 30 = 30ms\n");}