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/* MikMod sound library
(c) 1998, 1999, 2000, 2001 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.
*/
/*==============================================================================
$Id$
WAV sample loader
==============================================================================*/
/*
FIXME: Stereo .WAV files are not yet supported as samples.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include "mikmod_internals.h"
#ifdef SUNOS
extern int fprintf(FILE *, const char *, ...);
#endif
typedef struct WAV {
CHAR rID[4];
ULONG rLen;
CHAR wID[4];
CHAR fID[4];
ULONG fLen;
UWORD wFormatTag;
UWORD nChannels;
ULONG nSamplesPerSec;
ULONG nAvgBytesPerSec;
UWORD nBlockAlign;
UWORD nFormatSpecific;
} WAV;
SAMPLE* Sample_LoadGeneric_internal(MREADER* reader)
{
SAMPLE *si=NULL;
WAV wh;
BOOL have_fmt=0;
/* read wav header */
_mm_read_string(wh.rID,4,reader);
wh.rLen = _mm_read_I_ULONG(reader);
_mm_read_string(wh.wID,4,reader);
/* check for correct header */
if(_mm_eof(reader)|| memcmp(wh.rID,"RIFF",4) || memcmp(wh.wID,"WAVE",4)) {
_mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
return NULL;
}
/* scan all RIFF blocks until we find the sample data */
for(;;) {
CHAR dID[4];
ULONG len,start;
_mm_read_string(dID,4,reader);
len = _mm_read_I_ULONG(reader);
/* truncated file ? */
if (_mm_eof(reader)) {
_mm_errno=MMERR_UNKNOWN_WAVE_TYPE;
return NULL;
}
start = _mm_ftell(reader);
/* sample format block
should be present only once and before a data block */
if(!memcmp(dID,"fmt ",4)) {
wh.wFormatTag = _mm_read_I_UWORD(reader);
wh.nChannels = _mm_read_I_UWORD(reader);
wh.nSamplesPerSec = _mm_read_I_ULONG(reader);
wh.nAvgBytesPerSec = _mm_read_I_ULONG(reader);
wh.nBlockAlign = _mm_read_I_UWORD(reader);
wh.nFormatSpecific = _mm_read_I_UWORD(reader);
#ifdef MIKMOD_DEBUG
fprintf(stderr,"\rwavloader : wFormatTag=%04x blockalign=%04x nFormatSpc=%04x\n",
wh.wFormatTag,wh.nBlockAlign,wh.nFormatSpecific);
#endif
if((have_fmt)||(wh.nChannels>1)) {
_mm_errno=MMERR_UNKNOWN_WAVE_TYPE;
return NULL;
}
have_fmt=1;
} else
/* sample data block
should be present only once and after a format block */
if(!memcmp(dID,"data",4)) {
if(!have_fmt) {
_mm_errno=MMERR_UNKNOWN_WAVE_TYPE;
return NULL;
}
if(!(si=(SAMPLE*)MikMod_malloc(sizeof(SAMPLE)))) return NULL;
si->speed = wh.nSamplesPerSec/wh.nChannels;
si->volume = 64;
si->length = len;
if(wh.nBlockAlign == 2) {
si->flags = SF_16BITS | SF_SIGNED;
si->length >>= 1;
}
si->inflags = si->flags;
SL_RegisterSample(si,MD_SNDFX,reader);
SL_LoadSamples();
/* skip any other remaining blocks - so in case of repeated sample
fragments, we'll return the first anyway instead of an error */
break;
}
/* onto next block */
_mm_fseek(reader,start+len,SEEK_SET);
if (_mm_eof(reader))
break;
}
return si;
}
MIKMODAPI SAMPLE* Sample_LoadGeneric(MREADER* reader)
{
SAMPLE* result;
MUTEX_LOCK(vars);
result=Sample_LoadGeneric_internal(reader);
MUTEX_UNLOCK(vars);
return result;
}
MIKMODAPI extern SAMPLE *Sample_LoadMem(const char *buf, int len)
{
SAMPLE* result=NULL;
MREADER* reader;
if ((reader=_mm_new_mem_reader(buf, len))) {
result=Sample_LoadGeneric(reader);
_mm_delete_mem_reader(reader);
}
return result;
}
MIKMODAPI SAMPLE* Sample_LoadFP(FILE *fp)
{
SAMPLE* result=NULL;
MREADER* reader;
if((reader=_mm_new_file_reader(fp))) {
result=Sample_LoadGeneric(reader);
_mm_delete_file_reader(reader);
}
return result;
}
MIKMODAPI SAMPLE* Sample_Load(CHAR* filename)
{
FILE *fp;
SAMPLE *si=NULL;
if(!(md_mode & DMODE_SOFT_SNDFX)) return NULL;
if((fp=_mm_fopen(filename,"rb"))) {
si = Sample_LoadFP(fp);
_mm_fclose(fp);
}
return si;
}
MIKMODAPI void Sample_Free(SAMPLE* si)
{
if(si) {
MD_SampleUnload(si->handle);
MikMod_free(si);
}
}
void Sample_Free_internal(SAMPLE *si)
{
MUTEX_LOCK(vars);
Sample_Free(si);
MUTEX_UNLOCK(vars);
}
/* ex:set ts=4: */
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