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comparison playercode/mwav.c @ 6:d14fd386d182

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Initial entry of mikmod into the CVS tree.
author darius
date Fri, 23 Jan 1998 16:05:09 +0000
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5:42e11dc15457 6:d14fd386d182
1 /*
2
3 Name: MWAV.C
4
5 Description:
6 WAV sample loader
7 Stereo .WAV files are not yet supported as samples.
8
9 Portability:
10 All compilers -- All systems (hopefully)
11
12 */
13
14 #include <string.h>
15 #include "mikmod.h"
16
17
18 typedef struct WAV
19 { CHAR rID[4];
20 ULONG rLen;
21 CHAR wID[4];
22 CHAR fID[4];
23 ULONG fLen;
24 UWORD wFormatTag;
25 UWORD nChannels;
26 ULONG nSamplesPerSec;
27 ULONG nAvgBytesPerSec;
28 UWORD nBlockAlign;
29 UWORD nFormatSpecific;
30 } WAV;
31
32
33 SAMPLE *WAV_LoadFP(FILE *fp)
34 {
35 SAMPLE *si;
36 static WAV wh;
37 static CHAR dID[4];
38
39 // read wav header
40
41 _mm_read_string(wh.rID,4,fp);
42 wh.rLen = _mm_read_I_ULONG(fp);
43 _mm_read_string(wh.wID,4,fp);
44
45 while(1)
46 { _mm_read_string(wh.fID,4,fp);
47 wh.fLen = _mm_read_I_ULONG(fp);
48 if(memcmp(wh.fID,"fmt ",4) == 0) break;
49 _mm_fseek(fp,wh.fLen,SEEK_CUR);
50 }
51
52 if( feof(fp) ||
53 memcmp(wh.rID,"RIFF",4) ||
54 memcmp(wh.wID,"WAVE",4))
55 {
56 _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
57 return NULL;
58 }
59
60 wh.wFormatTag = _mm_read_I_UWORD(fp);
61 wh.nChannels = _mm_read_I_UWORD(fp);
62 wh.nSamplesPerSec = _mm_read_I_ULONG(fp);
63 wh.nAvgBytesPerSec = _mm_read_I_ULONG(fp);
64 wh.nBlockAlign = _mm_read_I_UWORD(fp);
65 wh.nFormatSpecific = _mm_read_I_UWORD(fp);
66
67 // check it
68
69 if(feof(fp))
70 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
71 return NULL;
72 }
73
74 // skip other crap
75
76 _mm_fseek(fp,wh.fLen-16,SEEK_CUR);
77 _mm_read_string(dID,4,fp);
78
79 if(memcmp(dID,"data",4))
80 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
81 return NULL;
82 }
83
84 if(wh.nChannels > 1)
85 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
86 return NULL;
87 }
88
89 // printf("wFormatTag: %x\n",wh.wFormatTag);
90 // printf("blockalign: %x\n",wh.nBlockAlign);
91 // prinff("nFormatSpc: %x\n",wh.nFormatSpecific);
92
93 if((si=(SAMPLE *)_mm_calloc(1,sizeof(SAMPLE)))==NULL) return NULL;
94
95 si->speed = wh.nSamplesPerSec;
96 si->volume = 64;
97 si->length = _mm_read_I_ULONG(fp);
98
99 if(wh.nBlockAlign == 2)
100 { si->flags = SF_16BITS | SF_SIGNED;
101 si->length >>= 1;
102 }
103
104 SL_RegisterSample(si,MD_SNDFX,fp);
105
106 return si;
107 }
108
109
110 SAMPLE *WAV_LoadFN(CHAR *filename)
111 {
112 FILE *fp;
113 SAMPLE *si;
114
115 if(!(md_mode & DMODE_SOFT_SNDFX)) return NULL;
116 if((fp=_mm_fopen(filename,"rb"))==NULL) return NULL;
117
118 si = WAV_LoadFP(fp);
119 SL_LoadSamples();
120 fclose(fp);
121
122 return si;
123 }
124
125
126 void WAV_Free(SAMPLE *si)
127 {
128 if(si!=NULL)
129 { MD_SampleUnLoad(si->handle);
130 free(si);
131 }
132 }
133