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comparison playercode/load_wav.c @ 4:5d614bcc4287

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Initial entry of mikmod into the CVS tree.
author darius
date Fri, 23 Jan 1998 16:05:08 +0000
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3:71e20a32bd84 4:5d614bcc4287
1 /*
2
3 Name: LOAD_WAV.C
4
5 Description:
6 WAV Streaming Audio Loader / Player
7
8 Portability:
9 All compilers -- All systems (hopefully)
10
11 */
12
13 #include "mikmod.h"
14 #include <string.h>
15
16
17 typedef struct
18 { CHAR rID[4];
19 ULONG rLen;
20 CHAR wID[4];
21 CHAR fID[4];
22 ULONG fLen;
23 UWORD wFormatTag;
24 UWORD nChannels;
25 ULONG nSamplesPerSec;
26 ULONG nAvgBytesPerSec;
27 UWORD nBlockAlign;
28 UWORD nFormatSpecific;
29 } WAV;
30
31
32 BOOL WAV_Load(void)
33 {
34 SAMPLE *si;
35 static WAV wh;
36 static CHAR dID[4];
37
38 // read wav header
39
40 _mm_read_string(wh.rID,4,stream_fp);
41 wh.rLen = _mm_read_I_ULONG(stream_fp);
42 _mm_read_string(wh.wID,4,stream_fp);
43 _mm_read_string(wh.fID,4,stream_fp);
44 wh.fLen = _mm_read_I_ULONG(stream_fp);
45 wh.wFormatTag = _mm_read_I_UWORD(stream_fp);
46 wh.nChannels = _mm_read_I_UWORD(stream_fp);
47 wh.nSamplesPerSec = _mm_read_I_ULONG(stream_fp);
48 wh.nAvgBytesPerSec = _mm_read_I_ULONG(stream_fp);
49 wh.nBlockAlign = _mm_read_I_UWORD(stream_fp);
50 wh.nFormatSpecific = _mm_read_I_UWORD(stream_fp);
51
52 // check it
53
54 if( feof(stream_fp) ||
55 memcmp(wh.rID,"RIFF",4) ||
56 memcmp(wh.wID,"WAVE",4) ||
57 memcmp(wh.fID,"fmt ",4) )
58 {
59 _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
60 return NULL;
61 }
62
63 // skip other crap
64
65 _mm_fseek(stream_fp,wh.fLen-16,SEEK_CUR);
66 _mm_read_string(dID,4,stream_fp);
67
68 if( memcmp(dID,"data",4) )
69 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
70 return NULL;
71 }
72
73 if(wh.nChannels > 1)
74 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
75 return NULL;
76 }
77
78 // printf("wFormatTag: %x\n",wh.wFormatTag);
79 // printf("blockalign: %x\n",wh.nBlockAlign);
80 // prinff("nFormatSpc: %x\n",wh.nFormatSpecific);
81
82 if((si=(SAMPLE *)_mm_calloc(1,sizeof(SAMPLE)))==NULL) return NULL;
83
84 si->speed = wh.nSamplesPerSec/wh.nChannels;
85 si->volume = 64;
86
87 si->length = _mm_read_I_ULONG(stream_fp);
88
89 if(wh.nBlockAlign==2)
90 { si->flags = SF_16BITS | SF_SIGNED;
91 si->length>>=1;
92 }
93
94 return 0;
95 }
96
97