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comparison decoders/mod.c @ 43:e5082972f9bc

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Initial add.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 22 Sep 2001 14:29:35 +0000
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children 69d56e196de7
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42:2b63642fb6ff 43:e5082972f9bc
1 /*
2 * SDL_sound -- An abstract sound format decoding API.
3 * Copyright (C) 2001 Ryan C. Gordon.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /*
21 * Module player - through MikMod - for SDL_sound.
22 *
23 * This driver handles anything our subset of MikMod handles. It is based on
24 * SDL_mixer's MikMod music player.
25 *
26 * Please see the file LICENSE in the source's root directory, and the file
27 * COPYING.LESSER in the mikmod subdirectory.
28 *
29 * This file written by Torbjörn Andersson (d91tan@Update.UU.SE)
30 */
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <assert.h>
36 #include "SDL_sound.h"
37 #include "mikmod.h"
38
39 #define __SDL_SOUND_INTERNAL__
40 #include "SDL_sound_internal.h"
41
42 #if (!defined SOUND_SUPPORTS_MOD)
43 #error SOUND_SUPPORTS_MOD must be defined.
44 #endif
45
46 static int MOD_init(void);
47 static void MOD_quit(void);
48 static int MOD_open(Sound_Sample *sample, const char *ext);
49 static void MOD_close(Sound_Sample *sample);
50 static Uint32 MOD_read(Sound_Sample *sample);
51
52 const Sound_DecoderFunctions __Sound_DecoderFunctions_MOD =
53 {
54 {
55 "MOD",
56 "Play modules through MikMod",
57 "Torbjörn Andersson <d91tan@Update.UU.SE>",
58 "http://www.mikmod.org/"
59 },
60
61 MOD_init, /* init() method */
62 MOD_quit, /* quit() method */
63 MOD_open, /* open() method */
64 MOD_close, /* close() method */
65 MOD_read /* read() method */
66 };
67
68 /* this is what we store in our internal->decoder_private field... */
69 typedef struct {
70 MODULE *module;
71 } mod_t;
72
73
74 /* Make MikMod read from a RWops... */
75
76 typedef struct MRWOPSREADER {
77 MREADER core;
78 Sound_Sample *sample;
79 int end;
80 } MRWOPSREADER;
81
82 static BOOL _mm_RWopsReader_eof(MREADER *reader)
83 {
84 MRWOPSREADER *rwops_reader = (MRWOPSREADER *) reader;
85 Sound_Sample *sample = rwops_reader->sample;
86 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
87 int pos = SDL_RWtell(internal->rw);
88
89 if (rwops_reader->end == pos)
90 return(1);
91
92 return(0);
93 } /* _mm_RWopsReader_eof */
94
95
96 static BOOL _mm_RWopsReader_read(MREADER *reader, void *ptr, size_t size)
97 {
98 MRWOPSREADER *rwops_reader = (MRWOPSREADER *) reader;
99 Sound_Sample *sample = rwops_reader->sample;
100 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
101 return(SDL_RWread(internal->rw, ptr, size, 1));
102 } /* _mm_RWopsReader_Read */
103
104
105 static int _mm_RWopsReader_get(MREADER *reader)
106 {
107 char buf;
108 MRWOPSREADER *rwops_reader = (MRWOPSREADER *) reader;
109 Sound_Sample *sample = rwops_reader->sample;
110 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
111
112 if (SDL_RWread(internal->rw, &buf, 1, 1) != 1)
113 return(EOF);
114
115 return((int) buf);
116 } /* _mm_RWopsReader_get */
117
118
119 static BOOL _mm_RWopsReader_seek(MREADER *reader, long offset, int whence)
120 {
121 MRWOPSREADER *rwops_reader = (MRWOPSREADER *) reader;
122 Sound_Sample *sample = rwops_reader->sample;
123 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
124
125 return(SDL_RWseek(internal->rw, offset, whence));
126 } /* _mm_RWopsReader_seek */
127
128
129 static long _mm_RWopsReader_tell(MREADER *reader)
130 {
131 MRWOPSREADER *rwops_reader = (MRWOPSREADER *) reader;
132 Sound_Sample *sample = rwops_reader->sample;
133 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
134
135 return(SDL_RWtell(internal->rw));
136 } /* _mm_RWopsReader_tell */
137
138
139 static MREADER *_mm_new_rwops_reader(Sound_Sample *sample)
140 {
141 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
142
143 MRWOPSREADER *reader = (MRWOPSREADER *) malloc(sizeof (MRWOPSREADER));
144 if (reader != NULL)
145 {
146 int here;
147 reader->core.Eof = _mm_RWopsReader_eof;
148 reader->core.Read = _mm_RWopsReader_read;
149 reader->core.Get = _mm_RWopsReader_get;
150 reader->core.Seek = _mm_RWopsReader_seek;
151 reader->core.Tell = _mm_RWopsReader_tell;
152 reader->sample = sample;
153
154 /* RWops does not explicitly support an eof check, so we shall find
155 the end manually - this requires seek support for the RWop */
156 here = SDL_RWtell(internal->rw);
157 reader->end = SDL_RWseek(internal->rw, 0, SEEK_END);
158 SDL_RWseek(internal->rw, here, SEEK_SET); /* Move back */
159 /* !!! FIXME: What happens if the seek fails? */
160 } /* if */
161
162 return((MREADER *) reader);
163 } /* _mm_new_rwops_reader */
164
165
166 static void _mm_delete_rwops_reader(MREADER *reader)
167 {
168 /* SDL_sound will delete the RWops and sample at a higher level... */
169 if (reader != NULL)
170 free(reader);
171 } /* _mm_delete_rwops_reader */
172
173
174
175 static int MOD_init(void)
176 {
177 MikMod_RegisterAllDrivers();
178 MikMod_RegisterAllLoaders();
179
180 /*
181 * Both DMODE_SOFT_MUSIC and DMODE_16BITS should be set by default,
182 * so this is just for clarity. I haven't experimented with any of
183 * the other flags. There are a few which are said to give better
184 * sound quality.
185 */
186 md_mode |= (DMODE_SOFT_MUSIC | DMODE_16BITS);
187 #if 1
188 /*
189 * SDL_mixer used to set these, but I don't know... is there
190 * something wrong with the defaults? Actually, the only difference
191 * from the defaults is md_reverb, which is usually 6.
192 */
193 md_device = 0; /* Selects sound driver. 0 = autodetect */
194 md_volume = 96; /* Overall sound volume, 0 - 128 */
195 md_musicvolume = 128; /* Module volume, 0 - 128 */
196 md_sndfxvolume = 128; /* Sound effect volume, 0 - 128 */
197 md_pansep = 128; /* Stereo channels separation, 0 - 128 */
198 md_reverb = 0; /* Sound reverbation, 0 - 15 */
199 #endif
200
201 BAIL_IF_MACRO(MikMod_Init(""), MikMod_strerror(MikMod_errno), 0);
202
203 return(1); /* success. */
204 } /* MOD_init */
205
206
207 static void MOD_quit(void)
208 {
209 MikMod_Exit();
210 } /* MOD_quit */
211
212
213 static int MOD_open(Sound_Sample *sample, const char *ext)
214 {
215 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
216 MREADER *reader;
217 mod_t *m;
218
219 m = (mod_t *) malloc(sizeof(mod_t));
220 BAIL_IF_MACRO(m == NULL, ERR_OUT_OF_MEMORY, 0);
221 reader = _mm_new_rwops_reader(sample);
222 BAIL_IF_MACRO(reader == NULL, ERR_OUT_OF_MEMORY, 0);
223 m->module = Player_LoadGeneric(reader, 64, 0);
224 _mm_delete_rwops_reader(reader);
225 BAIL_IF_MACRO(m->module == NULL, "MOD: Not a module file.", 0);
226
227 md_mixfreq = sample->desired.rate;
228 sample->actual.channels = 2;
229 sample->actual.rate = md_mixfreq;
230 sample->actual.format = AUDIO_S16SYS;
231 internal->decoder_private = (void *) m;
232
233 Player_Start(m->module);
234 Player_SetPosition(0);
235
236 /* !!! FIXME: A little late to be giving this information... */
237 sample->flags = SOUND_SAMPLEFLAG_NEEDSEEK;
238
239 _D(("MOD: Accepting data stream\n"));
240 return(1); /* we'll handle this data. */
241 } /* MOD_open */
242
243
244 static void MOD_close(Sound_Sample *sample)
245 {
246 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
247 mod_t *m = (mod_t *) internal->decoder_private;
248
249 Player_Free(m->module);
250 } /* MOD_close */
251
252
253 static Uint32 MOD_read(Sound_Sample *sample)
254 {
255 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
256 mod_t *m = (mod_t *) internal->decoder_private;
257
258 /* Switch to the current module, stopping any previous one. */
259 Player_Start(m->module);
260 if (!Player_Active())
261 {
262 sample->flags |= SOUND_SAMPLEFLAG_EOF;
263 return(0);
264 } /* if */
265 return((Uint32) VC_WriteBytes(internal->buffer, internal->buffer_size));
266 } /* MOD_read */
267
268
269 /* end of mod.c ... */
270