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1.1 root 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 "config.h"
13: #include "options.h"
14: #include "memory.h"
15: #include "custom.h"
16: #include "gensound.h"
17: #include "sounddep/sound.h"
18:
19: #include <sys/ioctl.h>
20:
21: #ifdef HAVE_SYS_SOUNDCARD_H
22: #include <sys/soundcard.h>
23: #elif defined HAVE_MACHINE_SOUNDCARD_H
24: #include <machine/soundcard.h>
25: #else
26: #error "Something went wrong during configuration."
27: #endif
28:
29: int sound_fd;
1.1.1.3 ! root 30: static int have_sound = 0;
1.1 root 31: static unsigned long formats;
32:
33: uae_u16 sndbuffer[44100];
34: uae_u16 *sndbufpt;
35: int sndbufsize;
36:
1.1.1.2 root 37: static int exact_log2 (int v)
1.1 root 38: {
39: int l = 0;
40: while ((v >>= 1) != 0)
41: l++;
42: return l;
43: }
44:
1.1.1.2 root 45: void close_sound (void)
1.1 root 46: {
47: if (have_sound)
1.1.1.2 root 48: close (sound_fd);
1.1 root 49: }
50:
1.1.1.3 ! root 51: /* Try to determine whether sound is available. This is only for GUI purposes. */
1.1.1.2 root 52: int setup_sound (void)
1.1 root 53: {
54: sound_fd = open ("/dev/dsp", O_WRONLY);
1.1.1.3 ! root 55:
! 56: sound_available = 0;
! 57:
! 58: if (sound_fd < 0) {
! 59: perror ("Can't open /dev/dsp");
! 60: if (errno == EBUSY) {
! 61: /* We can hope, can't we ;) */
! 62: sound_available = 1;
! 63: return 1;
! 64: }
1.1 root 65: return 0;
1.1.1.3 ! root 66: }
1.1 root 67:
68: if (ioctl (sound_fd, SNDCTL_DSP_GETFMTS, &formats) == -1) {
1.1.1.3 ! root 69: perror ("ioctl failed - can't use sound");
! 70: close (sound_fd);
1.1 root 71: return 0;
72: }
73:
74: sound_available = 1;
1.1.1.3 ! root 75: close (sound_fd);
1.1 root 76: return 1;
77: }
78:
79: int init_sound (void)
80: {
81: int tmp;
82: int rate;
83: int dspbits;
84:
1.1.1.3 ! root 85: sound_fd = open ("/dev/dsp", O_WRONLY);
! 86: have_sound = !(sound_fd < 0);
! 87: if (! have_sound) {
! 88: perror ("Can't open /dev/dsp");
! 89: if (errno != EBUSY)
! 90: sound_available = 0;
! 91: return 0;
! 92: }
! 93: if (ioctl (sound_fd, SNDCTL_DSP_GETFMTS, &formats) == -1) {
! 94: perror ("ioctl failed - can't use sound");
! 95: close (sound_fd);
! 96: have_sound = 0;
! 97: return 0;
! 98: }
! 99:
1.1 root 100: if (currprefs.sound_maxbsiz < 128 || currprefs.sound_maxbsiz > 16384) {
1.1.1.2 root 101: fprintf (stderr, "Sound buffer size %d out of range.\n", currprefs.sound_maxbsiz);
1.1 root 102: currprefs.sound_maxbsiz = 8192;
103: }
104:
1.1.1.2 root 105: tmp = 0x00040000 + exact_log2 (currprefs.sound_maxbsiz);
1.1 root 106: ioctl (sound_fd, SNDCTL_DSP_SETFRAGMENT, &tmp);
107: ioctl (sound_fd, SNDCTL_DSP_GETBLKSIZE, &sndbufsize);
108:
109: dspbits = currprefs.sound_bits;
110: ioctl (sound_fd, SNDCTL_DSP_SAMPLESIZE, &dspbits);
111: ioctl (sound_fd, SOUND_PCM_READ_BITS, &dspbits);
112: if (dspbits != currprefs.sound_bits) {
1.1.1.2 root 113: fprintf (stderr, "Can't use sound with %d bits\n", currprefs.sound_bits);
1.1 root 114: return 0;
115: }
116:
117: tmp = currprefs.stereo;
118: ioctl (sound_fd, SNDCTL_DSP_STEREO, &tmp);
119:
120: rate = currprefs.sound_freq;
121: ioctl (sound_fd, SNDCTL_DSP_SPEED, &rate);
122: ioctl (sound_fd, SOUND_PCM_READ_RATE, &rate);
123: /* Some soundcards have a bit of tolerance here. */
124: if (rate < currprefs.sound_freq * 90 / 100 || rate > currprefs.sound_freq * 110 / 100) {
1.1.1.2 root 125: fprintf (stderr, "Can't use sound with desired frequency %d\n", currprefs.sound_freq);
1.1 root 126: return 0;
127: }
128:
129: sample_evtime = (long)maxhpos * maxvpos * 50 / rate;
130:
131: if (dspbits == 16) {
132: /* Will this break horribly on bigendian machines? Possible... */
133: if (!(formats & AFMT_S16_LE))
134: return 0;
135: init_sound_table16 ();
1.1.1.2 root 136: sample_handler = currprefs.stereo ? sample16s_handler : sample16_handler;
1.1 root 137: } else {
138: if (!(formats & AFMT_U8))
139: return 0;
140: init_sound_table8 ();
1.1.1.2 root 141: sample_handler = currprefs.stereo ? sample8s_handler : sample8_handler;
1.1 root 142: }
143: sound_available = 1;
144: printf ("Sound driver found and configured for %d bits at %d Hz, buffer is %d bytes\n",
145: dspbits, rate, sndbufsize);
146: sndbufpt = sndbuffer;
147:
148: #ifdef FRAME_RATE_HACK
149: vsynctime = vsynctime * 9 / 10;
150: #endif
151:
152: return 1;
153: }
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