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Annotation of uae/src/sd-uss/sound.c, revision 1.1.1.1

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

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