1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/* MikMod sound library
(c) 1998, 1999 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: mwav.c,v 1.21 1999/03/24 06:00:06 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_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);
if (_mm_eof(reader)) break;
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((si)||(have_fmt)||(wh.nChannels>1)) {
if(si) Sample_Free_internal(si);
_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)||(si)) {
if(si) Sample_Free_internal(si);
_mm_errno=MMERR_UNKNOWN_WAVE_TYPE;
return NULL;
}
if(!(si=(SAMPLE*)_mm_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();
}
/* onto next block */
_mm_fseek(reader,start+len,SEEK_SET);
}
return si;
}
SAMPLE* Sample_LoadGeneric(MREADER* reader)
{
SAMPLE* result;
MUTEX_LOCK
result=Sample_LoadGeneric_internal(reader);
MUTEX_UNLOCK
return result;
}
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;
}
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);
fclose(fp);
}
return si;
}
void Sample_Free(SAMPLE* si)
{
if(si) {
MD_SampleUnload(si->handle);
free(si);
}
}
void Sample_Free_internal(SAMPLE *si)
{
MUTEX_LOCK
Sample_Free(si);
MUTEX_UNLOCK
}
/* ex:set ts=4: */
|
