/*============================================================================*/
int Snd_init_dev()
{
int whoami;
S_fd_snddev = -1;
S_son_pid = 0;
if(access(S_snddev,W_OK) != 0)
{
perror("No access to sound device");
return EXIT_FAILURE;
}
S_fd_snddev = open(S_snddev,O_WRONLY);
if(S_fd_snddev < 0)
{
fprintf(stderr,"int_snddev: Cannot open sound device \n");
return EXIT_FAILURE;
}
close(S_fd_snddev);
if(pipe(S_fd_pipe) < 0)
{
fprintf(stderr,"Cannot create pipe for sound control \n");
return EXIT_FAILURE;
}
/* now setup 2nd process for writing the data... */
if((whoami = fork()) < 0)
{
fprintf(stderr,"Cannot fork sound driver\n");
return EXIT_FAILURE;
}
if(whoami != 0) /* successfully created son */
{
close(S_fd_pipe[0]); /* close end for reading */
S_son_pid = whoami;
return EXIT_SUCCESS;
}
/* Here is the code for the son... */
{
int sound_num,ch,i;
struct timeval tval = {0L,0L};
fd_set readfds,dsp;
Mix mix;
int frag, fragsize;
Channel *chan = (Channel*)malloc( sizeof(Channel)*S_num_channels );
for (i=0; i<S_num_channels; i++)
Chan_reset( chan+i );
S_fd_snddev = open(S_snddev,O_WRONLY );
if(S_fd_snddev < 0)
{
perror("Cannot open sound device: ");
exit(1);
}
frag = FRAG_SPEC; /*defined in soundIt.h */
ioctl(S_fd_snddev, SNDCTL_DSP_SETFRAGMENT, &frag);
if ( ioctl(S_fd_snddev,SNDCTL_DSP_SPEED, &S_playback_freq)==-1 )
perror("Sound driver ioctl ");
fragsize=0;
if ( ioctl(S_fd_snddev,SNDCTL_DSP_GETBLKSIZE, &fragsize)==-1 )
perror("Sound driver ioctl ");
/* printf("after: block size: %d \n",fragsize); */
/* init mixer object*/
Mix_alloc( &mix, fragsize );
close(S_fd_pipe[1]); /* close end for writing */
FD_ZERO(&dsp);
FD_SET(S_fd_snddev, &dsp);
FD_ZERO(&readfds);
FD_SET(S_fd_pipe[0], &readfds);
printf("soundIt library v"SOUNDIT_VERS" initialized.\n");
for(;;)
{
FD_SET(S_fd_pipe[0], &readfds);
tval.tv_sec=0L;
tval.tv_usec=0L;
select(S_fd_pipe[0]+1, &readfds,NULL,NULL,&tval);
if (FD_ISSET(S_fd_pipe[0], &readfds))
{
if (read(S_fd_pipe[0], &sound_num, sizeof(int))==0)
break;
read(S_fd_pipe[0], &ch, sizeof(int));
/* printf("chan=%d snd=%d len=%d \n", ch, sound_num, S_sounds[sound_num].len ); */
Chan_assign( &(chan[ch]), &(S_sounds[sound_num]) );
}
Chan_mixAll(&mix,chan);
write(S_fd_snddev, mix.Vclippedbuf, fragsize );
}
Mix_dealloc( &mix );
printf("soundIt process exiting..\n");
close(S_fd_pipe[0]);
close(S_fd_pipe[1]);
exit (0);
} /*end of child process */
}
//
// Snd init dev
//
int Snd_init_dev()
{
int whoami;
S_fd_snddev = -1;
S_son_pid = 0;
if(access(S_snddev,W_OK) != 0)
{
perror("No access to sound device");
return EXIT_FAILURE;
}
S_fd_snddev = open(S_snddev,O_WRONLY);
if(S_fd_snddev < 0)
{
fprintf(stderr,"int_snddev: Cannot open sound device \n");
return EXIT_FAILURE;
}
close(S_fd_snddev);
if(pipe(S_fd_pipe) < 0)
{
fprintf(stderr,"Cannot create pipe for sound control \n");
return EXIT_FAILURE;
}
if((whoami = fork()) < 0)
{
fprintf(stderr,"Cannot fork sound driver\n");
return EXIT_FAILURE;
}
if(whoami != 0)
{
close(S_fd_pipe[0]);
S_son_pid = whoami;
return EXIT_SUCCESS;
}
/* Here is the code for the son... */
{
int sound_num,ch,i;
struct timeval tval = {0L,0L};
fd_set readfds,dsp;
Mix mix;
int frag, fragsize;
Channel *chan = (Channel*)malloc( sizeof(Channel)*S_num_channels );
for (i=0; i<S_num_channels; i++)
Chan_reset( chan+i );
S_fd_snddev = open(S_snddev,O_WRONLY );
if(S_fd_snddev < 0)
{
perror("Cannot open sound device: ");
exit(1);
}
frag = FRAG_SPEC;
ioctl(S_fd_snddev, SNDCTL_DSP_SETFRAGMENT, &frag);
if ( ioctl(S_fd_snddev,SNDCTL_DSP_SPEED, &S_playback_freq)==-1 )
perror("Sound driver ioctl ");
fragsize=0;
if ( ioctl(S_fd_snddev,SNDCTL_DSP_GETBLKSIZE, &fragsize)==-1 )
perror("Sound driver ioctl ");
// init mixer
Mix_alloc( &mix, fragsize );
close(S_fd_pipe[1]);
FD_ZERO(&dsp);
FD_SET(S_fd_snddev, &dsp);
FD_ZERO(&readfds);
FD_SET(S_fd_pipe[0], &readfds);
printf("Sound driver initialized.\n");
for(;;)
{
FD_SET(S_fd_pipe[0], &readfds);
tval.tv_sec=0L;
tval.tv_usec=0L;
select(S_fd_pipe[0]+1, &readfds,NULL,NULL,&tval);
if (FD_ISSET(S_fd_pipe[0], &readfds))
{
if (read(S_fd_pipe[0], &sound_num, sizeof(int))==0)
break;
read(S_fd_pipe[0], &ch, sizeof(int));
/* printf("chan=%d snd=%d len=%d \n", ch, sound_num, S_sounds[sound_num].len ); */
/* Find free channel for sample */
if(ch == -1) {
printf("Reset %d\n", sound_num);
Chan_resetSound(chan, sound_num);
} else
for(i = 0; i < S_num_channels; i++ ){
if (chan[i].Vleft==0){
Chan_assign( &(chan[i]), &(S_sounds[sound_num]), sound_num );
break;
}
}
}
Chan_mixAll(&mix,chan);
write(S_fd_snddev, mix.Vclippedbuf, fragsize );
}
Mix_dealloc( &mix );
printf("Sound process exiting..\n");
close(S_fd_pipe[0]);
close(S_fd_pipe[1]);
exit (0);
}
} // end of the function