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1.1.1.3 root 1: /*
1.1 root 2: * UAE - The Un*x Amiga Emulator
1.1.1.3 root 3: *
1.1 root 4: * Support for Linux/USS sound
1.1.1.3 root 5: *
1.1 root 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:
32: static int exact_log2(int v)
33: {
34: int l = 0;
35: while ((v >>= 1) != 0)
36: l++;
37: return l;
38: }
39:
40: void close_sound(void)
41: {
42: int t;
43: uae_u32 v;
44: char buf[4];
1.1.1.3 root 45:
1.1 root 46: if (!have_sound)
47: return;
1.1.1.3 root 48:
1.1 root 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:
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:
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 ? 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 = ((currprefs.sound_bits == 8 ? 1 : 2)
108: * (currprefs.stereo ? 2 : 1)) + 65536*currprefs.sound_bits;
109: buf[t] = v & 255;
110: buf[t+1] = (v>>8) & 255;
111: buf[t+2] = (v>>16) & 255;
112: buf[t+3] = (v>>24) & 255;
113: t = 28; v = (currprefs.sound_freq * (currprefs.sound_bits == 8 ? 1 : 2)
114: * (currprefs.stereo ? 2 : 1));
115: buf[t] = v & 255;
116: buf[t+1] = (v>>8) & 255;
117: buf[t+2] = (v>>16) & 255;
118: buf[t+3] = (v>>24) & 255;
119: write (sound_fd, buf, 44);
120:
1.1.1.4 ! root 121: obtained_freq = currprefs.sound_freq;
1.1 root 122:
123: if (currprefs.sound_bits == 16) {
124: init_sound_table16 ();
1.1.1.2 root 125: sample_handler = currprefs.stereo ? sample16s_handler : sample16_handler;
1.1 root 126: } else {
127: init_sound_table8 ();
1.1.1.2 root 128: sample_handler = currprefs.stereo ? sample8s_handler : sample8_handler;
1.1 root 129: }
130: sound_available = 1;
131: sndbufsize = 44100;
132: printf ("Writing sound into \"sound.output\"; %d bits at %d Hz\n",
133: currprefs.sound_bits, currprefs.sound_freq, sndbufsize);
134: sndbufpt = sndbuffer;
135: return 1;
136: }
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