c62d2810 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Ben Parnell |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | */ |
20 | |
21 | #include <stdlib.h> |
22 | #include <stdio.h> |
23 | #include <unistd.h> |
24 | #include <string.h> |
25 | #include <ctype.h> |
26 | #include <errno.h> |
27 | #include <fcntl.h> |
28 | #include <sys/ioctl.h> |
29 | #include <sys/wait.h> |
30 | #include <sys/types.h> |
31 | #include <sys/stat.h> |
32 | #include <sched.h> |
33 | #include <sys/soundcard.h> |
34 | |
35 | #include "../../types.h" |
36 | |
37 | static int format; |
38 | static int dspfd; |
39 | |
40 | // fsize is in samples, not bytes(gets translated before ioctl()) |
41 | int InitUNIXDSPSound(int *rate, int bits, int fsize, int nfrags) |
42 | { |
43 | int x; |
44 | |
45 | printf(" Opening /dev/dsp..."); |
46 | dspfd=open("/dev/dsp",O_WRONLY); |
47 | if(dspfd==-1) goto __disperror; |
48 | |
49 | if(!bits) goto skip16check; |
50 | x=AFMT_S16_LE; |
51 | format=0; |
52 | printf("\n Setting format to 16-bit, signed, LSB first..."); |
53 | if(ioctl(dspfd,SNDCTL_DSP_SETFMT,&x)==-1) |
54 | { |
55 | skip16check: |
56 | x=AFMT_U8; |
57 | printf("\n Setting format to 8-bit, unsigned..."); |
58 | if(ioctl(dspfd,SNDCTL_DSP_SETFMT,&x)==-1) goto __disperror; |
59 | format=1; |
60 | } |
61 | |
62 | printf("\n Setting fragment size to %d samples and number of fragments to %d...",1<<fsize,nfrags); |
63 | |
64 | if(!format) |
65 | fsize++; |
66 | x=fsize|(nfrags<<16); |
67 | |
68 | if(ioctl(dspfd,SNDCTL_DSP_SETFRAGMENT,&x)==-1) |
69 | printf("ERROR (continuing anyway)\n"); |
70 | x=0; |
71 | printf("\n Setting mono sound..."); |
72 | if(ioctl(dspfd,SNDCTL_DSP_STEREO,&x)==-1) goto __disperror; |
73 | printf("\n Setting playback rate of %d hz...",*rate); |
74 | if(ioctl(dspfd,SNDCTL_DSP_SPEED,rate)==-1) goto __disperror; |
75 | printf("Set to %d hz\n",*rate); |
76 | if(*rate<8192 || *rate>65535) |
77 | { |
78 | printf(" Sample rate is out of the acceptable range(8192-65535).\n"); |
79 | close(dspfd); |
80 | return(0); |
81 | } |
82 | return 1; |
83 | __disperror: |
84 | printf("ERROR\n"); |
85 | return 0; |
86 | } |
87 | |
88 | void KillUNIXDSPSound(void) |
89 | { |
90 | close(dspfd); |
91 | } |
92 | |
93 | static int16 MBuffer[2048]; |
94 | void WriteUNIXDSPSound(int32 *Buffer, int Count, int noblocking) |
95 | { |
96 | int P,c; |
97 | int32 *src=Buffer; |
98 | |
99 | if(format) |
100 | { |
101 | uint8 *dest=(uint8 *)MBuffer; |
102 | for(P=Count;P;P--,dest++,src++) |
103 | *dest=(uint8)((*src)>>8)^128; |
104 | c=Count; |
105 | } |
106 | else |
107 | { |
108 | int16 *dest=MBuffer; |
109 | for(P=Count;P;P--,dest++,src++) |
110 | *dest=*src; |
111 | c=Count<<1; |
112 | } |
113 | |
114 | // noblocking=!noblocking; // speed testing |
115 | if(noblocking) |
116 | { |
117 | struct audio_buf_info ai; |
118 | if(!ioctl(dspfd,SNDCTL_DSP_GETOSPACE,&ai)) |
119 | if(ai.bytes<c) |
120 | return; |
121 | } |
122 | write(dspfd,(uint8 *)MBuffer,c); |
123 | } |