mplayer.c

wince下著名的视频播放器源码

}

static void DoS3MSlideDn(UWORD tick, MP_CONTROL *a, UBYTE inf)
{
	UBYTE hi,lo;

	if (inf)
		a->slidespeed=inf;
	else
		inf=a->slidespeed;

	hi=inf>>4;
	lo=inf&0xf;

	if (hi==0xf) {
		if (!tick) a->tmpperiod+=(UWORD)lo<<2;
	} else
	  if (hi==0xe) {
		if (!tick) a->tmpperiod+=lo;
	} else {
		if (tick) a->tmpperiod+=(UWORD)inf<<2;
	}
}

static int DoS3MEffectE(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if (a->main.period)
		DoS3MSlideDn(tick, a,dat);

	return 0;
}

static void DoS3MSlideUp(UWORD tick, MP_CONTROL *a, UBYTE inf)
{
	UBYTE hi,lo;

	if (inf) a->slidespeed=inf;
	else inf=a->slidespeed;

	hi=inf>>4;
	lo=inf&0xf;

	if (hi==0xf) {
		if (!tick) a->tmpperiod-=(UWORD)lo<<2;
	} else
	  if (hi==0xe) {
		if (!tick) a->tmpperiod-=lo;
	} else {
		if (tick) a->tmpperiod-=(UWORD)inf<<2;
	}
}

static int DoS3MEffectF(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if (a->main.period)
		DoS3MSlideUp(tick, a,dat);

	return 0;
}

static int DoS3MEffectI(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE inf, on, off;

	inf = UniGetByte();
	if (inf)
		a->s3mtronof = inf;
	else {
		inf = a->s3mtronof;
		if (!inf)
			return 0;
	}

	if (!tick)
		return 0;

	on=(inf>>4)+1;
	off=(inf&0xf)+1;
	a->s3mtremor%=(on+off);
	a->volume=(a->s3mtremor<on)?a->tmpvolume:0;
	a->ownvol=1;
	a->s3mtremor++;

	return 0;
}

static int DoS3MEffectQ(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE inf;

	inf = UniGetByte();
	if (a->main.period) {
		if (inf) {
			a->s3mrtgslide=inf>>4;
			a->s3mrtgspeed=inf&0xf;
		}

		/* only retrigger if low nibble > 0 */
		if (a->s3mrtgspeed>0) {
			if (!a->retrig) {
				/* when retrig counter reaches 0, reset counter and restart the
				   sample */
				if (a->main.kick!=KICK_NOTE) a->main.kick=KICK_KEYOFF;
				a->retrig=a->s3mrtgspeed;

				if ((tick)||(flags&UF_S3MSLIDES)) {
					switch (a->s3mrtgslide) {
					case 1:
					case 2:
					case 3:
					case 4:
					case 5:
						a->tmpvolume-=(1<<(a->s3mrtgslide-1));
						break;
					case 6:
						a->tmpvolume=(2*a->tmpvolume)/3;
						break;
					case 7:
						a->tmpvolume>>=1;
						break;
					case 9:
					case 0xa:
					case 0xb:
					case 0xc:
					case 0xd:
						a->tmpvolume+=(1<<(a->s3mrtgslide-9));
						break;
					case 0xe:
						a->tmpvolume=(3*a->tmpvolume)>>1;
						break;
					case 0xf:
						a->tmpvolume=a->tmpvolume<<1;
						break;
					}
					if (a->tmpvolume<0)
						a->tmpvolume=0;
					else if (a->tmpvolume>64)
						a->tmpvolume=64;
				}
			}
			a->retrig--; /* countdown  */
		}
	}

	return 0;
}

static int DoS3MEffectR(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat, q;
	UWORD temp=0;	/* silence warning */

	dat = UniGetByte();
	if (!tick) {
		if (dat&0x0f) a->trmdepth=dat&0xf;
		if (dat&0xf0) a->trmspd=(dat&0xf0)>>2;
	}

	q=(a->trmpos>>2)&0x1f;

	switch ((a->wavecontrol>>4)&3) {
	case 0: /* sine */
		temp=VibratoTable[q];
		break;
	case 1: /* ramp down */
		q<<=3;
		if (a->trmpos<0) q=255-q;
		temp=q;
		break;
	case 2: /* square wave */
		temp=255;
		break;
	case 3: /* random */
		temp=getrandom(256);
		break;
	}

	temp*=a->trmdepth;
	temp>>=7;

	if (a->trmpos>=0) {
		a->volume=a->tmpvolume+temp;
		if (a->volume>64) a->volume=64;
	} else {
		a->volume=a->tmpvolume-temp;
		if (a->volume<0) a->volume=0;
	}
	a->ownvol = 1;

	if (tick)
		a->trmpos+=a->trmspd;

	return 0;
}

static int DoS3MEffectT(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE tempo;

	tempo = UniGetByte();

	if (tick || mod->patdly2)
		return 0;

	mod->bpm = (tempo < 32) ? 32 : tempo;

	return 0;
}

static int DoS3MEffectU(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat, q;
	UWORD temp = 0;	/* silence warning */

	dat = UniGetByte();
	if (!tick) {
		if (dat&0x0f) a->vibdepth=dat&0xf;
		if (dat&0xf0) a->vibspd=(dat&0xf0)>>2;
	} else
		if (a->main.period) {
			q=(a->vibpos>>2)&0x1f;

			switch (a->wavecontrol&3) {
			case 0: /* sine */
				temp=VibratoTable[q];
				break;
			case 1: /* ramp down */
				q<<=3;
				if (a->vibpos<0) q=255-q;
				temp=q;
				break;
			case 2: /* square wave */
				temp=255;
				break;
			case 3: /* random */
				temp=getrandom(256);
				break;
			}

			temp*=a->vibdepth;
			temp>>=8;

			if (a->vibpos>=0)
				a->main.period=a->tmpperiod+temp;
			else
				a->main.period=a->tmpperiod-temp;
			a->ownper = 1;

			a->vibpos+=a->vibspd;
	}

	return 0;
}

/*========== Envelope helpers */

static int DoKeyOff(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	a->main.keyoff|=KEY_OFF;
	if ((!(a->main.volflg&EF_ON))||(a->main.volflg&EF_LOOP))
		a->main.keyoff=KEY_KILL;

	return 0;
}

static int DoKeyFade(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if ((tick>=dat)||(tick==mod->sngspd-1)) {
		a->main.keyoff=KEY_KILL;
		if (!(a->main.volflg&EF_ON))
			a->main.fadevol=0;
	}

	return 0;
}

/*========== Fast Tracker effects */

/* DoXMEffect6 after DoXMEffectA */

static int DoXMEffectA(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE inf, lo, hi;

	inf = UniGetByte();
	if (inf)
		a->s3mvolslide = inf;
	else
		inf = a->s3mvolslide;
	
	if (tick) {
		lo=inf&0xf;
		hi=inf>>4;

		if (!hi) {
			a->tmpvolume-=lo;
			if (a->tmpvolume<0) a->tmpvolume=0;
		} else {
			a->tmpvolume+=hi;
			if (a->tmpvolume>64) a->tmpvolume=64;
		}
	}

	return 0;
}

static int DoXMEffect6(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	if (a->main.period)
		DoVibrato(tick, a);

	return DoXMEffectA(tick, flags, a, mod, channel);
}

static int DoXMEffectE1(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if (!tick) {
		if (dat) a->fportupspd=dat;
		if (a->main.period)
			a->tmpperiod-=(a->fportupspd<<2);
	}

	return 0;
}

static int DoXMEffectE2(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if (!tick) {
		if (dat) a->fportdnspd=dat;
		if (a->main.period)
			a->tmpperiod+=(a->fportdnspd<<2);
	}

	return 0;
}

static int DoXMEffectEA(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if (!tick)
		if (dat) a->fslideupspd=dat;
	a->tmpvolume+=a->fslideupspd;
	if (a->tmpvolume>64) a->tmpvolume=64;

	return 0;
}

static int DoXMEffectEB(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if (!tick)
		if (dat) a->fslidednspd=dat;
	a->tmpvolume-=a->fslidednspd;
	if (a->tmpvolume<0) a->tmpvolume=0;

	return 0;
}

static int DoXMEffectG(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	mod->volume=UniGetByte()<<1;
	if (mod->volume>128) mod->volume=128;

	return 0;
}

static int DoXMEffectH(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE inf;

	inf = UniGetByte();

	if (tick) {
		if (inf) mod->globalslide=inf;
		else inf=mod->globalslide;
		if (inf & 0xf0) inf&=0xf0;
		mod->volume=mod->volume+((inf>>4)-(inf&0xf))*2;

		if (mod->volume<0)
			mod->volume=0;
		else if (mod->volume>128)
			mod->volume=128;
	}

	return 0;
}

static int DoXMEffectL(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat=UniGetByte();
	if ((!tick)&&(a->main.i)) {
		UWORD points;
		INSTRUMENT *i=a->main.i;
		MP_VOICE *aout;

		if ((aout=a->slave)) {
			if (aout->venv.env) {
				points=i->volenv[i->volpts-1].pos;
				aout->venv.p=aout->venv.env[(dat>points)?points:dat].pos;
			}
			if (aout->penv.env) {
				points=i->panenv[i->panpts-1].pos;
				aout->penv.p=aout->penv.env[(dat>points)?points:dat].pos;
			}
		}
	}

	return 0;
}

static int DoXMEffectP(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE inf, lo, hi;
	SWORD pan;

	inf = UniGetByte();
	if (!mod->panflag)
		return 0;

	if (inf)
		a->pansspd = inf;
	else
		inf =a->pansspd;

	if (tick) {
		lo=inf&0xf;
		hi=inf>>4;

		/* slide right has absolute priority */
		if (hi)
			lo = 0;

		pan=((a->main.panning==PAN_SURROUND)?PAN_CENTER:a->main.panning)+hi-lo;
		a->main.panning=(pan<PAN_LEFT)?PAN_LEFT:(pan>PAN_RIGHT?PAN_RIGHT:pan);
	}

	return 0;
}

static int DoXMEffectX1(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat = UniGetByte();
	if (dat)
		a->ffportupspd = dat;
	else
		dat = a->ffportupspd;

	if (a->main.period)
		if (!tick) {
			a->main.period-=dat;
			a->tmpperiod-=dat;
			a->ownper = 1;
		}

	return 0;
}

static int DoXMEffectX2(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	UBYTE dat;

	dat = UniGetByte();
	if (dat)
		a->ffportdnspd=dat;
	else
		dat = a->ffportdnspd;

	if (a->main.period)
		if (!tick) {
			a->main.period+=dat;
			a->tmpperiod+=dat;
			a->ownper = 1;
		}

	return 0;
}

/*========== Impulse Tracker effects */

static void DoITToneSlide(UWORD tick, MP_CONTROL *a, UBYTE dat)
{
	if (dat)
		a->portspeed = dat;

	/* if we don't come from another note, ignore the slide and play the note
	   as is */
	if (!a->oldnote || !a->main.period)
			return;

	if ((!tick)&&(a->newsamp)){
		a->main.kick=KICK_NOTE;
		a->main.start=-1;
	} else
		a->main.kick=(a->main.kick==KICK_NOTE)?KICK_ENV:KICK_ABSENT;

	if (tick) {
		int dist;

		/* We have to slide a->main.period towards a->wantedperiod, compute the
		   difference between those two values */
		dist=a->main.period-a->wantedperiod;

	    /* if they are equal or if portamentospeed is too big... */
		if ((!dist)||((a->portspeed<<2)>abs(dist)))
			/* ... make tmpperiod equal tperiod */
			a->tmpperiod=a->main.period=a->wantedperiod;
		else
		  if (dist>0) {	
			a->tmpperiod-=a->portspeed<<2;
			a->main.period-=a->portspeed<<2; /* dist>0 slide up */
		} else {				
			a->tmpperiod+=a->portspeed<<2;
			a->main.period+=a->portspeed<<2; /* dist<0 slide down */
		}
	} else
		a->tmpperiod=a->main.period;
	a->ownper=1;
}

static int DoITEffectG(UWORD tick, UWORD flags, MP_CONTROL *a, MODULE *mod, SWORD channel)
{
	DoITToneSlide(tick, a, UniGetByte());

	return 0;
}