Commit pandora source code
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280
src/sounddep/sound.cpp
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280
src/sounddep/sound.cpp
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/*
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* Minimalistic sound.c implementation for gp2x
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* (c) notaz, 2007
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#include <semaphore.h>
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#include <pthread.h>
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#include <errno.h>
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#include <sched.h>
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#include "sysconfig.h"
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#include "sysdeps.h"
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#include "uae.h"
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#include "options.h"
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#include "memory.h"
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#include "audio.h"
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#include "gensound.h"
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#include "sounddep/sound.h"
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#include "custom.h"
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#include "savestate.h"
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extern unsigned long next_sample_evtime;
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uae_u16 sndbuffer[4][(SNDBUFFER_LEN+32)*DEFAULT_SOUND_CHANNELS];
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uae_u16 *sndbufpt = sndbuffer[0];
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uae_u16 *render_sndbuff = sndbuffer[0];
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uae_u16 *finish_sndbuff = sndbuffer[0] + SNDBUFFER_LEN*2;
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static int have_sound = 0;
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static __inline__ void sound_default_evtime(void)
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{
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int pal = beamcon0 & 0x20;
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#ifndef PANDORA
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switch(m68k_speed)
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{
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case 6:
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scaled_sample_evtime=(unsigned)(MAXHPOS_PAL*MAXVPOS_PAL*VBLANK_HZ_PAL*CYCLE_UNIT/1.86)/currprefs.sound_freq;
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break;
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case 5:
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case 4: // ~4/3 234
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if (pal)
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scaled_sample_evtime=(MAXHPOS_PAL*244*VBLANK_HZ_PAL*CYCLE_UNIT)/currprefs.sound_freq; // ???
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else
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scaled_sample_evtime=(MAXHPOS_NTSC*255*VBLANK_HZ_NTSC*CYCLE_UNIT)/currprefs.sound_freq;
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break;
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case 3:
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case 2: // ~8/7 273
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if (pal)
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scaled_sample_evtime=(MAXHPOS_PAL*270*VBLANK_HZ_PAL*CYCLE_UNIT)/currprefs.sound_freq;
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else
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scaled_sample_evtime=(MAXHPOS_NTSC*255*VBLANK_HZ_NTSC*CYCLE_UNIT)/currprefs.sound_freq;
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break;
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case 1:
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default: // MAXVPOS_PAL?
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#endif
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if (pal)
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scaled_sample_evtime = (MAXHPOS_PAL*313*VBLANK_HZ_PAL*CYCLE_UNIT)/currprefs.sound_freq;
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else
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scaled_sample_evtime = (MAXHPOS_NTSC*MAXVPOS_NTSC*VBLANK_HZ_NTSC*CYCLE_UNIT)/currprefs.sound_freq + 1;
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#ifndef PANDORA
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break;
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}
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#endif
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}
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static int sounddev = -1, s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;
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static int sound_thread_active = 0, sound_thread_exit = 0;
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static sem_t sound_sem;
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static void *sound_thread(void *unused)
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{
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int cnt = 0, sem_val = 0;
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sound_thread_active = 1;
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for (;;)
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{
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sem_getvalue(&sound_sem, &sem_val);
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while (sem_val > 1)
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{
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sem_wait(&sound_sem);
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cnt++;
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sem_getvalue(&sound_sem, &sem_val);
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}
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sem_wait(&sound_sem);
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if (sound_thread_exit) break;
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if(currprefs.sound_stereo)
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write(sounddev, sndbuffer[cnt&3], SNDBUFFER_LEN*2);
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else
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write(sounddev, sndbuffer[cnt&3], SNDBUFFER_LEN);
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cnt++;
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}
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sound_thread_active = 0;
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return NULL;
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}
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static int pandora_start_sound(int rate, int bits, int stereo)
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{
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int frag = 0, buffers, ret;
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unsigned int bsize;
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if (!sound_thread_active)
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{
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// init sem, start sound thread
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pthread_t thr;
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sndbufpt = sndbuffer[0];
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render_sndbuff = sndbuffer[0];
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finish_sndbuff = sndbuffer[0] + SNDBUFFER_LEN*2;
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s_oldrate = 0;
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s_oldbits = 0;
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s_oldstereo = 0;
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sound_thread_exit = 0;
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ret = sem_init(&sound_sem, 0, 0);
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if (ret != 0)
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write_log("sem_init() failed: %i, errno=%i\n", ret, errno);
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ret = pthread_create(&thr, NULL, sound_thread, NULL);
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if (ret != 0)
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write_log("pthread_create() failed: %i\n", ret);
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pthread_detach(thr);
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}
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if (sounddev <= 0)
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{
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sounddev = open("/dev/dsp", O_WRONLY);
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if (sounddev == -1)
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{
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write_log("open(\"/dev/dsp\") failed with %i\n", errno);
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return -1;
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}
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}
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// if no settings change, we don't need to do anything
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if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo)
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return 0;
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ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
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ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
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ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
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// calculate buffer size
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buffers = 16;
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bsize = rate / 32;
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if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding
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while ((bsize>>=1)) frag++;
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frag |= buffers<<16; // 16 buffers
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ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
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s_oldrate = rate;
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s_oldbits = bits;
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s_oldstereo = stereo;
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usleep(100000);
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return 0;
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}
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// this is meant to be called only once on exit
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void pandora_stop_sound(void)
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{
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if (sound_thread_exit)
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printf("don't call gp2x_stop_sound more than once!\n");
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if (sound_thread_active)
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{
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sound_thread_exit = 1;
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sem_post(&sound_sem);
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usleep(100*1000);
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}
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if (sounddev > 0)
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close(sounddev);
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sounddev = -1;
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}
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static int wrcnt = 0;
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void finish_sound_buffer (void)
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{
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sem_post(&sound_sem);
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wrcnt++;
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sndbufpt = render_sndbuff = sndbuffer[wrcnt&3];
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if(currprefs.sound_stereo)
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finish_sndbuff = sndbufpt + SNDBUFFER_LEN;
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else
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finish_sndbuff = sndbufpt + SNDBUFFER_LEN/2;
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}
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void restart_sound_buffer(void)
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{
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sndbufpt = render_sndbuff = sndbuffer[wrcnt&3];
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if(currprefs.sound_stereo)
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finish_sndbuff = sndbufpt + SNDBUFFER_LEN;
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else
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finish_sndbuff = sndbufpt + SNDBUFFER_LEN/2;
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}
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/* Try to determine whether sound is available. This is only for GUI purposes. */
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int setup_sound (void)
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{
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if (pandora_start_sound(currprefs.sound_freq, 16, currprefs.sound_stereo) != 0)
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return 0;
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sound_available = 1;
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return 1;
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}
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void update_sound (int freq)
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{
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sound_default_evtime();
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}
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static int open_sound (void)
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{
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if (pandora_start_sound(currprefs.sound_freq, 16, currprefs.sound_stereo) != 0)
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return 0;
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init_sound_table16 ();
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sample_handler = currprefs.sound_stereo ? sample16s_handler : sample16_handler;
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have_sound = 1;
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sound_available = 1;
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if(currprefs.sound_stereo)
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sample_handler = sample16s_handler;
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else
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sample_handler = sample16_handler;
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return 1;
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}
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void close_sound (void)
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{
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if (!have_sound)
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return;
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// testing shows that reopenning sound device is not a good idea on gp2x (causes random sound driver crashes)
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// we will close it on real exit instead
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//pandora_stop_sound();
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have_sound = 0;
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}
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int init_sound (void)
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{
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have_sound=open_sound();
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return have_sound;
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}
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void pause_sound (void)
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{
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/* nothing to do */
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}
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void resume_sound (void)
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{
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/* nothing to do */
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}
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void reset_sound (void)
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{
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if (!have_sound)
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return;
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memset(sndbuffer, 0, 2 * 4 * (SNDBUFFER_LEN+32)*DEFAULT_SOUND_CHANNELS);
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}
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52
src/sounddep/sound.h
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52
src/sounddep/sound.h
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@ -0,0 +1,52 @@
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/*
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* UAE - The Un*x Amiga Emulator
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*
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* Support for Linux/USS sound
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*
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* Copyright 1997 Bernd Schmidt
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*/
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#if defined(PANDORA) || defined(ANDROIDSDL)
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#define DEFAULT_SOUND_CHANNELS 2
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#else
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#define DEFAULT_SOUND_CHANNELS 1
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#endif
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#define SNDBUFFER_LEN 2048
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extern uae_u16 sndbuffer[4][(SNDBUFFER_LEN+32)*DEFAULT_SOUND_CHANNELS];
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extern uae_u16 *sndbufpt;
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extern uae_u16 *render_sndbuff;
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extern uae_u16 *finish_sndbuff;
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extern int sndbufsize;
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extern void finish_sound_buffer (void);
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extern void restart_sound_buffer (void);
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extern int init_sound(void);
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extern void close_sound (void);
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extern int setup_sound (void);
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extern void resume_sound (void);
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extern void pause_sound (void);
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extern void reset_sound (void);
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#define check_sound_buffers() { if (sndbufpt >= finish_sndbuff) finish_sound_buffer (); }
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STATIC_INLINE void clear_sound_buffers (void)
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{
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memset (sndbuffer, 0, 4 * (SNDBUFFER_LEN + 32) * DEFAULT_SOUND_CHANNELS);
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}
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#define PUT_SOUND_WORD(b) do { *(uae_u16 *)sndbufpt = b; sndbufpt = (uae_u16 *)(((uae_u8 *)sndbufpt) + 2); } while (0)
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#define PUT_SOUND_WORD_LEFT(b) do { if (currprefs.sound_filter) b = filter (b, &sound_filter_state[0]); PUT_SOUND_WORD(b); } while (0)
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#define PUT_SOUND_WORD_RIGHT(b) do { if (currprefs.sound_filter) b = filter (b, &sound_filter_state[1]); PUT_SOUND_WORD(b); } while (0)
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#define PUT_SOUND_WORD_MONO(b) PUT_SOUND_WORD_LEFT(b)
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#define SOUND16_BASE_VAL 0
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#define DEFAULT_SOUND_BITS 16
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#define DEFAULT_SOUND_FREQ 44100
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#define FILTER_SOUND_OFF 0
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#define FILTER_SOUND_EMUL 1
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#define FILTER_SOUND_ON 2
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#define FILTER_SOUND_TYPE_A500 0
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#define FILTER_SOUND_TYPE_A1200 1
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