Function sys_command_cd_play

src/blkdev.cpp:831–856

play CD audio */

/* play CD audio */
int sys_command_cd_play (int unitnum, int startlsn, int endlsn, int scan)
{
	int v;
	if (failunit (unitnum))
		return 0;
	if (!getsem (unitnum))
		return 0;
	state[unitnum].play_end_pos = endlsn;
	if (state[unitnum].device_func->play == NULL) {
		uae_u8 cmd[12] = {0,0,0,0,0,0,0,0,0,0,0,0};
		int startmsf = lsn2msf (startlsn);
		int endmsf = lsn2msf (endlsn);
		cmd[0] = 0x47;
		cmd[3] = (uae_u8)(startmsf >> 16);
		cmd[4] = (uae_u8)(startmsf >> 8);
		cmd[5] = (uae_u8)(startmsf >> 0);
		cmd[6] = (uae_u8)(endmsf >> 16);
		cmd[7] = (uae_u8)(endmsf >> 8);
		cmd[8] = (uae_u8)(endmsf >> 0);
		v = do_scsi (unitnum, cmd, sizeof cmd) ? 0 : 1;
	} else {
		v = state[unitnum].device_func->play (unitnum, startlsn, endlsn, scan, NULL, NULL);
	}
	freesem (unitnum);
	return v;
}

/* play CD audio with subchannels */
int sys_command_cd_play (int unitnum, int startlsn, int endlsn, int scan, play_status_callback statusfunc, play_subchannel_callback subfunc)