test_au.c

一个两碟控制的VCD的代码,两碟之间的转动及连续播放,已大量生产的CODE.

/* SCCSID @(#)test_au.c	1.16 7/9/98 */


/**************************************************************************
 * Copyright 1997, ESS Technology, Inc.					
 *
 *************************************************************************/
/* #define MAIN */
#ifndef DRIVER
#define DRIVER
#endif

#include <stdio.h>
#include "../common.h"
#include "../mvd.h"
#include "../driver/util.h"
#include "../driver/low.h"
#include "../driver/buffer.h"
#include "newcomm.h"
#include "playsd.h"
#include "../constvar.h"

#include "../driver/graapi.h"
#include "play.h"
#include "stdfunc.h"
#include "globals.h"

int x10000=0x10000;
#undef AUDIOSTOP

#define	EPRINTF 	ESS_printf

#define wdram(a) ((a-x12000000)>>2)

extern int VBV_start;

extern int not_enabled;

volatile int buf0ready, buf1ready;

struct {
    int start;
    int end;
    int curr;
    int size;
    int read;
} wav_msf;  /* wave file location in logical unit */


extern int WAVbuf_inited;
void au_init() {
    WavBuf0Begin = (int) GX_malloc(WAVBUFSIZE);
    WavBuf1Begin = (int) GX_malloc(WAVBUFSIZE);
    WAVbuf_inited = 0;
    PCM_ampf = 0;
    WAV_initbuf();
#if 0
#ifndef AUDIOSTOP
    LOW_turn_on_audio();
#endif
#endif
}

int au_begin(char *fname, int repeat) {
    SoundData	sound_data;
    int *k1,*k2;
    int status, mmssff, numsec;
    int i;
    int nrdsec;
    WAV_data_ready=0;
    au_repeat=repeat;
#if 0
    LOW_init_audio();
    enable_int(buscon);
    /* PCM_stop_take_out(); */
    LOW_turn_off_audio();
    LOW_turn_on_audio();
    buscon_irq_disable(d2a);
    not_enabled=1;
#endif
    status = findfile(fname, 0);
    if (status != 1) {
        return -1;
    }
    numsec = ((CurrFile.sz-1)>>11)+1;
    wav_msf.start = wav_msf.curr = CurrFile.loc;
    wav_msf.end = wav_msf.start + numsec;
    wav_msf.size = CurrFile.sz;
    wav_msf.read = 0;
    k1 = (int*)WavBuf0Begin;
    k2 = (int*)WavBuf1Begin;
    for (i=0;i<WAVBUFSIZE>>2;i++){
	*(int *)k1 = 0; k1++;
	*(int *)k2 = 0; k2++;
    }
    wavbuf0size = 0;
    wavbuf1size = 0;
    buf0ready = buf1ready = 0;
    PCM_rd_ptr = 0;
    wav_wrptr = WavBuf0Begin;
    if (au_doit()!=0) return -1;
    
    sound_data.sd_addr = (char*) WavBuf0Begin;
    sound_data.sd_size = CurrFile.sz;

    PCM_xfersize = 0;
    PCM_rd_ptr = WavBuf0Begin;
    wavelen = wavbuf0size;
#if 0
#ifdef AUDIOSTOP
    LOW_turn_on_audio();
#endif
#endif
    PlayWAVE(sound_data.sd_addr, sound_data.sd_size);
    return 0;
}

int au_doit() {
    int mmssff,wavsecrd,wavbytes,status;
    int kcase = 0,k;
    int *k1;
    int offset=PCM_rd_ptr-wav_wrptr;
    int i;

    if (offset<0 || offset>=WAVBUFSIZE) {
	 k = (wav_wrptr==WavBuf0Begin);
	 kcase=k?1:2;
   	 wav_wrptr=k? WavBuf1Begin:WavBuf0Begin;
	 if (k) buf1ready = 0;
	 else buf0ready = 0;
    }
    if (au_repeat==0) {
        if (kcase==1) {
	    wavbuf0size=0;
         } else if (kcase==2) {
	    wavbuf1size=0;
         }
        if (PCM_srcsize<=0 && (wavbuf0size+wavbuf1size)==0) {
            au_end(0);
            return 1;
        }
        return 0;
    }
    if (kcase==0) return 0;
    else if (kcase==1) {
	VBV_start =  wdram(WavBuf0Begin);
    } else if (kcase==2) {
        VBV_start =  wdram(WavBuf1Begin);
    }
    VBV_end = VBV_start + (WAVBUFSIZE>>2);
#if 0
    VBV_size = WAVBUFSIZE >> 2;
#endif

    wavsecrd=wav_msf.end-wav_msf.curr;
    if (wavsecrd<=0) return 0;
    k = WAVBUFSIZE>>11;
    if (wavsecrd>=k) {
        wavbytes=WAVBUFSIZE;
        wavsecrd=k;
    } else {
        wavbytes=wav_msf.size-wav_msf.read;
    }
    mmssff=logical2physical(wav_msf.curr+150);
    status=getSectors(mmssff, wavsecrd, 2048);

    if (status!=1) {
#if 0
        if (kcase==1) k1 = (int*)WavBuf0Begin;
        else if (kcase==2) k1 = (int*)WavBuf1Begin;
        for (i=0;i<wavbytes>>2;i++) {
            *(int *)k1 = 0x80808080; k1++;
	}
#else
	if ((!buf0ready) && (!buf1ready)) au_end(0);
#endif
    }
    wav_msf.curr+=wavsecrd;
    wav_msf.read+=wavbytes;
    if (wav_msf.curr>=wav_msf.end) {
        wav_msf.curr=wav_msf.start;
        wav_msf.read=0;
        if (au_repeat>0) au_repeat--;
    }
    if (kcase==1) {
        wavbuf0size = wavbytes;
	buf0ready = 1;
    } else {
        wavbuf1size = wavbytes;
	buf1ready = 1;
    }
#if 0
    if (kcase==1) { myprints("fill buf0"); myprintn(wavbuf0size); }
    else { myprints("fill buf1"); myprintn(wavbuf1size); }
#endif
    if (status!=1) {
        if (PCM_rd_ptr == 0) return -1;
    }
    return 0;
}


void au_end(int flag) {
    int i;
    au_repeat=0;
    wavelen=0;
    wavbuf0size=0;
    wavbuf1size=0;
    WAV_data_ready=0;
/*
    for (i=0;i<WAVBUFSIZE/4;i++){
	*(int *)(WavBuf0Begin+i*4) = 0;
	*(int *)(WavBuf1Begin+i*4) = 0;
    }
*/
#if 0
    if (flag) {
        WAV_data_ready=0;
        not_enabled=1;
        buscon_irq_disable(d2a);
        buscon_disable(d2a); 
        LOW_turn_off_audio();
    }
#endif
}

#undef DRIVER