1 /*
2 * UAE - The Un*x Amiga Emulator
3 *
4 * Support for Linux/USS sound
5 *
6 * Copyright 1997 Bernd Schmidt
7 */
8
9 #include "sysconfig.h"
10 #include "sysdeps.h"
11
12 #include "options.h"
13 #include "memory.h"
14 #include "custom.h"
15 #include "audio.h"
16 #include "gensound.h"
17 #include "sounddep/sound.h"
18
19 #include <sys/ioctl.h>
20 #include <sys/soundcard.h>
21
22 int sound_fd;
23 static int have_sound;
24 static unsigned long formats;
25
26 unsigned long sndbuf_written;
27
28 uae_u16 sndbuffer[44100];
29 uae_u16 *sndbufpt;
30 int sndbufsize;
31
exact_log2(int v)32 static int exact_log2(int v)
33 {
34 int l = 0;
35 while ((v >>= 1) != 0)
36 l++;
37 return l;
38 }
39
close_sound(void)40 void close_sound(void)
41 {
42 int t;
43 uae_u32 v;
44 char buf[4];
45
46 if (!have_sound)
47 return;
48
49 t = 0;
50 v = sndbuf_written;
51 buf[t] = v & 255;
52 buf[t+1] = (v>>8) & 255;
53 buf[t+2] = (v>>16) & 255;
54 buf[t+3] = (v>>24) & 255;
55 lseek (sound_fd, 40, SEEK_SET);
56 write (sound_fd, buf, 4);
57
58 v += 36;
59 buf[t] = v & 255;
60 buf[t+1] = (v>>8) & 255;
61 buf[t+2] = (v>>16) & 255;
62 buf[t+3] = (v>>24) & 255;
63 lseek (sound_fd, 4, SEEK_SET);
64 write (sound_fd, buf, 4);
65
66 close(sound_fd);
67 }
68
setup_sound(void)69 int setup_sound(void)
70 {
71 sound_fd = open ("sound.output", O_CREAT|O_TRUNC|O_WRONLY, 0666);
72 have_sound = !(sound_fd < 0);
73 if (!have_sound)
74 return 0;
75
76 sound_available = 1;
77 return 1;
78 }
79
init_sound(void)80 int init_sound (void)
81 {
82 int t;
83 uae_u32 v;
84 int tmp;
85
86 char buf[200] = "RIFF WAVEfmt data ";
87
88 /* Prepare a .WAV header */
89 sndbuf_written = 44;
90 t = 16; v = 16;
91 buf[t] = v & 255;
92 buf[t+1] = (v>>8) & 255;
93 buf[t+2] = (v>>16) & 255;
94 buf[t+3] = (v>>24) & 255;
95
96 t = 20; v = 0x00010001 + (/* currprefs.stereo */ 1 ? 0x10000 : 0);
97 buf[t] = v & 255;
98 buf[t+1] = (v>>8) & 255;
99 buf[t+2] = (v>>16) & 255;
100 buf[t+3] = (v>>24) & 255;
101
102 t = 24; v = currprefs.sound_freq;
103 buf[t] = v & 255;
104 buf[t+1] = (v>>8) & 255;
105 buf[t+2] = (v>>16) & 255;
106 buf[t+3] = (v>>24) & 255;
107 t = 32; v = (2 * 2) + 65536 * 16;
108 buf[t] = v & 255;
109 buf[t+1] = (v>>8) & 255;
110 buf[t+2] = (v>>16) & 255;
111 buf[t+3] = (v>>24) & 255;
112 t = 28; v = (currprefs.sound_freq * 2 * 2);
113 buf[t] = v & 255;
114 buf[t+1] = (v>>8) & 255;
115 buf[t+2] = (v>>16) & 255;
116 buf[t+3] = (v>>24) & 255;
117 write (sound_fd, buf, 44);
118
119 obtained_freq = currprefs.sound_freq;
120
121 init_sound_table16 ();
122 sample_handler = sample16s_handler;
123 sound_available = 1;
124 sndbufsize = 44100;
125 printf ("Writing sound into \"sound.output\"; 16 bits at %d Hz\n",
126 currprefs.sound_freq, sndbufsize);
127 sndbufpt = sndbuffer;
128 return 1;
129 }
130