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- /* MikMod sound library
- (c) 1998 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- /*==============================================================================
-
- $Id: mwav.c,v 1.15 1998/12/07 06:00:48 miod Exp $
-
- WAV sample loader
-
- ==============================================================================*/
-
- /*
- FIXME: Stereo .WAV files are not yet supported as samples.
- */
-
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include <string.h>
-
- #include <mikmod_internals.h>
-
- 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_LoadFP(FILE* fp)
- {
- SAMPLE *si;
- WAV wh;
- CHAR dID[4];
-
- /* read wav header */
- _mm_read_string(wh.rID,4,fp);
- wh.rLen = _mm_read_I_ULONG(fp);
- _mm_read_string(wh.wID,4,fp);
-
- while(1) {
- _mm_read_string(wh.fID,4,fp);
- wh.fLen = _mm_read_I_ULONG(fp);
- if(!(memcmp(wh.fID,"fmt ",4))) break;
- _mm_fseek(fp,wh.fLen,SEEK_CUR);
- }
-
- if(feof(fp)|| memcmp(wh.rID,"RIFF",4) || memcmp(wh.wID,"WAVE",4)) {
- _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
- return NULL;
- }
-
- wh.wFormatTag = _mm_read_I_UWORD(fp);
- wh.nChannels = _mm_read_I_UWORD(fp);
- wh.nSamplesPerSec = _mm_read_I_ULONG(fp);
- wh.nAvgBytesPerSec = _mm_read_I_ULONG(fp);
- wh.nBlockAlign = _mm_read_I_UWORD(fp);
- wh.nFormatSpecific = _mm_read_I_UWORD(fp);
-
- if(feof(fp)) {
- _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
- return NULL;
- }
-
- /* skip other crap */
- _mm_fseek(fp,wh.fLen-16,SEEK_CUR);
- _mm_read_string(dID,4,fp);
-
- if(memcmp(dID,"data",4)) {
- _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
- return NULL;
- }
-
- if(wh.nChannels>1) {
- _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
- return NULL;
- }
-
- #ifdef MIKMOD_DEBUG
- fprintf(stderr,"\rwavloader : wFormatTag=%04x blockalign=%04x nFormatSpc=%04x\n",
- wh.wFormatTag,wh.nBlockAlign,wh.nFormatSpecific);
- #endif
-
- if(!(si=(SAMPLE*)_mm_malloc(sizeof(SAMPLE)))) return NULL;
-
- si->speed = wh.nSamplesPerSec/wh.nChannels;
- si->volume = 64;
- si->length = _mm_read_I_ULONG(fp);
-
- if(wh.nBlockAlign == 2) {
- si->flags = SF_16BITS | SF_SIGNED;
- si->length >>= 1;
- }
-
- SL_RegisterSample(si,MD_SNDFX,fp);
- SL_LoadSamples();
-
- return si;
- }
-
- SAMPLE* Sample_Load(CHAR* filename)
- {
- FILE *fp;
- SAMPLE *si;
-
- if(!(md_mode & DMODE_SOFT_SNDFX)) return NULL;
- if(!(fp=_mm_fopen(filename,"rb"))) return NULL;
-
- si = Sample_LoadFP(fp);
- fclose(fp);
-
- return si;
- }
-
- void Sample_Free(SAMPLE* si)
- {
- if(si) {
- MD_SampleUnload(si->handle);
- free(si);
- }
- }
-
-