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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/* MikMod sound library
(c) 1998-2005 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.
*/
/*==============================================================================
libmikmod driver for audio output on SDL-supported platforms.
Initially written by Paul Spark <sparkynz74@gmail.com>
Rewrite/major fixes by O. Sezer <sezero@users.sourceforge.net>
==============================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mikmod_internals.h"
#ifdef DRV_SDL
#include <string.h>
#if defined(SDL_FRAMEWORK) || defined(NO_SDL_CONFIG)
#include <SDL/SDL.h>
#else
#include "SDL.h"
#endif
#define NUMSAMPLES 256 /* a fair default for md_mixfreq <= 11025 Hz */
static SDL_AudioSpec spec;
static int enabled = 0;
static void SDLSoundCallback(void *userdata, Uint8 *stream, int len)
{
if (!enabled) return;
if (enabled < 0) {
if (++enabled == 0)
enabled = 1;
return;
}
MUTEX_LOCK(vars);
if (Player_Paused_internal()) {
VC_SilenceBytes((SBYTE *) stream, (ULONG)len);
}
else
{
int got = (int) VC_WriteBytes((SBYTE *) stream, (ULONG)len);
if (got < len) { /* fill the rest with silence, then */
VC_SilenceBytes((SBYTE *) &stream[got], (ULONG)(len-got));
}
}
MUTEX_UNLOCK(vars);
}
static BOOL SetupSDLAudio(void)
{
SDL_AudioSpec wanted;
wanted.freq = md_mixfreq;
wanted.format =
#if (SDL_MAJOR_VERSION >= 2)
(md_mode & DMODE_FLOAT) ? AUDIO_F32SYS :
#endif
(md_mode & DMODE_16BITS)? AUDIO_S16SYS : AUDIO_U8;
wanted.channels = (md_mode & DMODE_STEREO)? 2 : 1;
wanted.samples = (md_mixfreq <= 11025)? (NUMSAMPLES ) :
(md_mixfreq <= 22050)? (NUMSAMPLES * 2) :
(md_mixfreq <= 44100)? (NUMSAMPLES * 4) :
(NUMSAMPLES * 8);
wanted.userdata = NULL;
wanted.callback = SDLSoundCallback;
if (SDL_OpenAudio(&wanted, &spec) < 0) {
_mm_errno=MMERR_OPENING_AUDIO;
return 0;
}
return 1;
}
static BOOL SDLDrv_IsPresent(void)
{
if ((SDL_WasInit(SDL_INIT_AUDIO)) == 0) {
if (SDL_Init(SDL_INIT_AUDIO) < 0)
return 0;
SDL_QuitSubSystem(SDL_INIT_AUDIO);
}
return 1;
}
static int SDLDrv_Init(void)
{
#if (SDL_MAJOR_VERSION < 2)
if (md_mode & DMODE_FLOAT) {
_mm_errno=MMERR_NO_FLOAT32;
return 1;
}
#endif
if (SDL_Init(SDL_INIT_AUDIO) < 0) {
_mm_errno=MMERR_OPENING_AUDIO;
return 1;
}
if (!SetupSDLAudio()) {
return 1;
}
md_mode |= DMODE_SOFT_MUSIC;
if (VC_Init())
return 1;
enabled = -2; /* delay the callback 2 frames */
return 0;
}
static void SDLDrv_Exit(void)
{
SDL_LockAudio();
enabled = 0;
SDL_UnlockAudio();
SDL_CloseAudio();
VC_Exit();
}
static int SDLDrv_Reset(void)
{
SDLDrv_Exit();
return SDLDrv_Init();
}
static void SDLDrv_Update( void )
{
/* do nothing */
}
static void SDLDrv_PlayStop(void)
{
SDL_PauseAudio(1);
VC_PlayStop();
}
static int SDLDrv_PlayStart(void)
{
if (VC_PlayStart())
return 1;
SDL_PauseAudio(0);
return 0;
}
MIKMODAPI struct MDRIVER drv_sdl =
{
NULL,
"SDL",
"SDL Driver v1.3",
0,255,
"sdl",
NULL,
NULL,
SDLDrv_IsPresent,
VC_SampleLoad,
VC_SampleUnload,
VC_SampleSpace,
VC_SampleLength,
SDLDrv_Init,
SDLDrv_Exit,
SDLDrv_Reset,
VC_SetNumVoices,
SDLDrv_PlayStart,
SDLDrv_PlayStop,
SDLDrv_Update,
NULL,
VC_VoiceSetVolume,
VC_VoiceGetVolume,
VC_VoiceSetFrequency,
VC_VoiceGetFrequency,
VC_VoiceSetPanning,
VC_VoiceGetPanning,
VC_VoicePlay,
VC_VoiceStop,
VC_VoiceStopped,
VC_VoiceGetPosition,
VC_VoiceRealVolume
};
#else
MISSING(drv_sdl);
#endif
|
