load_far.c

wince下著名的视频播放器源码

/*	MikMod sound library
	(c) 1998, 1999, 2000, 2001, 2002 Miodrag Vallat and others - see file
	AUTHORS for complete list.

	This library is free software; you can redistribute it and/or modify
	it under the terms of the GNU Library General Public License as
	published by the Free Software Foundation; either version 2 of
	the License, or (at your option) any later version.
 
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Library General Public License for more details.
 
	You should have received a copy of the GNU Library General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	02111-1307, USA.
*/

/*==============================================================================

  $Id: load_far.c,v 1.1.1.1 2004/01/21 01:36:35 raph Exp $

  Farandole (FAR) module loader

==============================================================================*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <stdio.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <string.h>

#include "mikmod_internals.h"

#ifdef SUNOS
extern int fprintf(FILE *, const char *, ...);
#endif

/*========== Module structure */

typedef struct FARHEADER1 {
	UBYTE id[4];			/* file magic */
	CHAR  songname[40];		/* songname */
	CHAR  blah[3];			/* 13,10,26 */
	UWORD headerlen;		/* remaining length of header in bytes */
	UBYTE version;
	UBYTE onoff[16];
	UBYTE edit1[9];
	UBYTE speed;
	UBYTE panning[16];
	UBYTE edit2[4];
	UWORD stlen;
} FARHEADER1;

typedef struct FARHEADER2 {
	UBYTE orders[256];
	UBYTE numpat;
	UBYTE snglen;
	UBYTE loopto;
	UWORD patsiz[256];
} FARHEADER2;

typedef struct FARSAMPLE {
	CHAR  samplename[32];
	ULONG length;
	UBYTE finetune;
	UBYTE volume;
	ULONG reppos;
	ULONG repend;
	UBYTE type;
	UBYTE loop;
} FARSAMPLE;

typedef struct FARNOTE {
	UBYTE note,ins,vol,eff;
} FARNOTE;

/*========== Loader variables */

static	CHAR FAR_Version[] = "Farandole";
static	FARHEADER1 *mh1 = NULL;
static	FARHEADER2 *mh2 = NULL;
static	FARNOTE *pat = NULL;

static	unsigned char FARSIG[4+3]={'F','A','R',0xfe,13,10,26};

/*========== Loader code */

BOOL FAR_Test(void)
{
	UBYTE id[47];

	if(!_mm_read_UBYTES(id,47,modreader)) return 0;
	if((memcmp(id,FARSIG,4))||(memcmp(id+44,FARSIG+4,3))) return 0;
	return 1;
}

BOOL FAR_Init(void)
{
	if(!(mh1 = (FARHEADER1*)_mm_malloc(sizeof(FARHEADER1)))) return 0;
	if(!(mh2 = (FARHEADER2*)_mm_malloc(sizeof(FARHEADER2)))) return 0;
	if(!(pat = (FARNOTE*)_mm_malloc(256*16*4*sizeof(FARNOTE)))) return 0;

	return 1;
}

void FAR_Cleanup(void)
{
	_mm_free(mh1);
	_mm_free(mh2);
	_mm_free(pat);
}

static UBYTE *FAR_ConvertTrack(FARNOTE* n,int rows)
{
	int t,vibdepth=1;

	UniReset();
	for(t=0;t<rows;t++) {
		if(n->note) {
			UniInstrument(n->ins);
			UniNote(n->note+3*OCTAVE-1);
		}
		if (n->vol&0xf) UniPTEffect(0xc,(n->vol&0xf)<<2);
		if (n->eff)
			switch(n->eff>>4) {
				case 0x3: /* porta to note */
					UniPTEffect(0x3,(n->eff&0xf)<<4);
					break;
				case 0x4: /* retrigger */
					UniPTEffect(0x0e, 0x90 | (n->eff & 0x0f));
					break;
				case 0x5: /* set vibrato depth */
					vibdepth=n->eff&0xf;
					break;
				case 0x6: /* vibrato */
					UniPTEffect(0x4,((n->eff&0xf)<<4)|vibdepth);
					break;
				case 0x7: /* volume slide up */
					UniPTEffect(0xa,(n->eff&0xf)<<4);
					break;
				case 0x8: /* volume slide down */
					UniPTEffect(0xa,n->eff&0xf);
					break;
				case 0xb: /* panning */
					UniPTEffect(0xe,0x80|(n->eff&0xf));
					break;
				case 0xf: /* set speed */
					UniPTEffect(0xf,n->eff&0xf);
					break;

				/* others not yet implemented */
				default:
#ifdef MIKMOD_DEBUG
					fprintf(stderr,"\rFAR: unsupported effect %02X\n",n->eff);
#endif
					break;
			}

		UniNewline();
		n+=16;
	}
	return UniDup();
}

BOOL FAR_Load(BOOL curious)
{
	int t,u,tracks=0;
	SAMPLE *q;
	FARSAMPLE s;
	FARNOTE *crow;
	UBYTE smap[8];

	/* try to read module header (first part) */
	_mm_read_UBYTES(mh1->id,4,modreader);
	_mm_read_SBYTES(mh1->songname,40,modreader);
	_mm_read_SBYTES(mh1->blah,3,modreader);
	mh1->headerlen = _mm_read_I_UWORD (modreader);
	mh1->version   = _mm_read_UBYTE (modreader);
	_mm_read_UBYTES(mh1->onoff,16,modreader);
	_mm_read_UBYTES(mh1->edit1,9,modreader);
	mh1->speed     = _mm_read_UBYTE(modreader);
	_mm_read_UBYTES(mh1->panning,16,modreader);
	_mm_read_UBYTES(mh1->edit2,4,modreader);
	mh1->stlen     = _mm_read_I_UWORD (modreader);

	/* init modfile data */
	of.modtype   = strdup(FAR_Version);
	of.songname  = DupStr(mh1->songname,40,1);
	of.numchn    = 16;
	of.initspeed = mh1->speed;
	of.inittempo = 80;
	of.reppos    = 0;
	of.flags    |= UF_PANNING;
	for(t=0;t<16;t++) of.panning[t]=mh1->panning[t]<<4;

	/* read songtext into comment field */
	if(mh1->stlen)
		if (!ReadLinedComment(mh1->stlen, 66)) return 0;

	/* try to read module header (second part) */
	_mm_read_UBYTES(mh2->orders,256,modreader);
	mh2->numpat        = _mm_read_UBYTE(modreader);
	mh2->snglen        = _mm_read_UBYTE(modreader);
	mh2->loopto        = _mm_read_UBYTE(modreader);
	_mm_read_I_UWORDS(mh2->patsiz,256,modreader);

	of.numpos = mh2->snglen;
	if(!AllocPositions(of.numpos)) return 0;
	for(t=0;t<of.numpos;t++) {
		if(mh2->orders[t]==0xff) break;
		of.positions[t] = mh2->orders[t];
	}

	/* count number of patterns stored in file */
	of.numpat = 0;
	for(t=0;t<256;t++)
		if(mh2->patsiz[t])
			if((t+1)>of.numpat) of.numpat=t+1;
	of.numtrk = of.numpat*of.numchn;

	/* seek across eventual new data */
	_mm_fseek(modreader,mh1->headerlen-(869+mh1->stlen),SEEK_CUR);

	/* alloc track and pattern structures */
	if(!AllocTracks()) return 0;
	if(!AllocPatterns()) return 0;

	for(t=0;t<of.numpat;t++) {
		UBYTE rows=0,tempo;

		memset(pat,0,256*16*4*sizeof(FARNOTE));
		if(mh2->patsiz[t]) {
			rows  = _mm_read_UBYTE(modreader);
			tempo = _mm_read_UBYTE(modreader);

			crow = pat;
			/* file often allocates 64 rows even if there are less in pattern */
			if (mh2->patsiz[t]<2+(rows*16*4)) {
				_mm_errno = MMERR_LOADING_PATTERN;
				return 0;
			}
			for(u=(mh2->patsiz[t]-2)/4;u;u--,crow++) {
				crow->note = _mm_read_UBYTE(modreader);
				crow->ins  = _mm_read_UBYTE(modreader);
				crow->vol  = _mm_read_UBYTE(modreader);
				crow->eff  = _mm_read_UBYTE(modreader);
			}

			if(_mm_eof(modreader)) {
				_mm_errno = MMERR_LOADING_PATTERN;
				return 0;
			}

			crow=pat;
			of.pattrows[t] = rows;
			for(u=16;u;u--,crow++)
				if(!(of.tracks[tracks++]=FAR_ConvertTrack(crow,rows))) {
					_mm_errno=MMERR_LOADING_PATTERN;
					return 0;
				}
		} else
			tracks+=16;
	}

	/* read sample map */
	if(!_mm_read_UBYTES(smap,8,modreader)) {
		_mm_errno = MMERR_LOADING_HEADER;
		return 0;
	}

	/* count number of samples used */
	of.numins = 0;
	for(t=0;t<64;t++)
		if(smap[t>>3]&(1<<(t&7))) of.numins=t+1;
	of.numsmp = of.numins;             

	/* alloc sample structs */
	if(!AllocSamples()) return 0;

	q = of.samples;
	for(t=0;t<of.numsmp;t++) {
		q->speed      = 8363;
		q->flags      = SF_SIGNED;
		if(smap[t>>3]&(1<<(t&7))) {
			_mm_read_SBYTES(s.samplename,32,modreader);
			s.length   = _mm_read_I_ULONG(modreader);
			s.finetune = _mm_read_UBYTE(modreader);
			s.volume   = _mm_read_UBYTE(modreader);
			s.reppos   = _mm_read_I_ULONG(modreader);
			s.repend   = _mm_read_I_ULONG(modreader);
			s.type     = _mm_read_UBYTE(modreader);
			s.loop     = _mm_read_UBYTE(modreader);

			q->samplename = DupStr(s.samplename,32,1);
			q->length     = s.length;
			q->loopstart  = s.reppos;
			q->loopend    = s.repend;
			q->volume     = s.volume<<2;

			if(s.type&1) q->flags|=SF_16BITS;
			if(s.loop&8) q->flags|=SF_LOOP;

			q->seekpos    = _mm_ftell(modreader);
			_mm_fseek(modreader,q->length,SEEK_CUR);
		} else 
			q->samplename = DupStr(NULL,0,0);
		q++;
	}
	return 1;
}

CHAR *FAR_LoadTitle(void)
{
	CHAR s[40];

	_mm_fseek(modreader,4,SEEK_SET);
	if(!_mm_read_UBYTES(s,40,modreader)) return NULL;
   
	return(DupStr(s,40,1));
}

/*========== Loader information */

MIKMODAPI MLOADER load_far={
	NULL,
	"FAR",
	"FAR (Farandole Composer)",
	FAR_Init,
	FAR_Test,
	FAR_Load,
	FAR_Cleanup,
	FAR_LoadTitle
};

/* ex:set ts=4: */