/
music.c
1145 lines (1007 loc) · 30.8 KB
1
/*
2
SDL_mixer: An audio mixer library based on the SDL library
3
Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
20
*/
21
#include <string.h> /* for strtok() and strtok_s() */
22
23
#include "SDL_hints.h"
24
#include "SDL_log.h"
25
#include "SDL_timer.h"
26
27
#include "SDL_mixer.h"
28
#include "mixer.h"
29
#include "music.h"
30
31
#include "music_cmd.h"
32
33
#include "music_wav.h"
#include "music_mikmod.h"
34
#include "music_modplug.h"
35
36
37
#include "music_nativemidi.h"
#include "music_fluidsynth.h"
#include "music_timidity.h"
38
#include "music_ogg.h"
39
#include "music_opus.h"
40
#include "music_mpg123.h"
41
#include "music_mad.h"
42
#include "music_smpeg.h"
43
#include "music_flac.h"
44
#include "native_midi/native_midi.h"
45
46
47
48
49
50
/* Check to make sure we are building with a new enough SDL */
#if SDL_COMPILEDVERSION < SDL_VERSIONNUM(2, 0, 7)
#error You need SDL 2.0.7 or newer from http://www.libsdl.org
#endif
51
52
53
/* Set this hint to true if you want verbose logging of music interfaces */
#define SDL_MIXER_HINT_DEBUG_MUSIC_INTERFACES \
"SDL_MIXER_DEBUG_MUSIC_INTERFACES"
55
char *music_cmd = NULL;
56
57
static SDL_bool music_active = SDL_TRUE;
static int music_volume = MIX_MAX_VOLUME;
58
static Mix_Music * volatile music_playing = NULL;
59
SDL_AudioSpec music_spec;
60
61
struct _Mix_Music {
62
63
64
65
Mix_MusicInterface *interface;
void *context;
SDL_bool playing;
66
67
68
Mix_Fading fading;
int fade_step;
int fade_steps;
69
70
};
71
72
73
/* Used to calculate fading steps */
static int ms_per_step;
74
75
76
77
/* rcg06042009 report available decoders at runtime. */
static const char **music_decoders = NULL;
static int num_decoders = 0;
78
/* Semicolon-separated SoundFont paths */
79
static char* soundfont_paths = NULL;
80
81
82
83
84
85
86
87
88
89
/* Interfaces for the various music interfaces, ordered by priority */
static Mix_MusicInterface *s_music_interfaces[] =
{
#ifdef MUSIC_CMD
&Mix_MusicInterface_CMD,
#endif
#ifdef MUSIC_WAV
&Mix_MusicInterface_WAV,
#endif
90
91
92
93
94
95
#ifdef MUSIC_FLAC
&Mix_MusicInterface_FLAC,
#endif
#ifdef MUSIC_OGG
&Mix_MusicInterface_OGG,
#endif
96
97
98
#ifdef MUSIC_OPUS
&Mix_MusicInterface_Opus,
#endif
99
100
101
102
103
104
105
106
107
#ifdef MUSIC_MP3_MPG123
&Mix_MusicInterface_MPG123,
#endif
#ifdef MUSIC_MP3_MAD
&Mix_MusicInterface_MAD,
#endif
#ifdef MUSIC_MP3_SMPEG
&Mix_MusicInterface_SMPEG,
#endif
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
#ifdef MUSIC_MOD_MODPLUG
&Mix_MusicInterface_MODPLUG,
#endif
#ifdef MUSIC_MOD_MIKMOD
&Mix_MusicInterface_MIKMOD,
#endif
#ifdef MUSIC_MID_FLUIDSYNTH
&Mix_MusicInterface_FLUIDSYNTH,
#endif
#ifdef MUSIC_MID_TIMIDITY
&Mix_MusicInterface_TIMIDITY,
#endif
#ifdef MUSIC_MID_NATIVE
&Mix_MusicInterface_NATIVEMIDI,
#endif
};
int get_num_music_interfaces(void)
{
return SDL_arraysize(s_music_interfaces);
}
Mix_MusicInterface *get_music_interface(int index)
{
return s_music_interfaces[index];
}
135
int Mix_GetNumMusicDecoders(void)
136
{
137
return(num_decoders);
138
139
140
141
}
const char *Mix_GetMusicDecoder(int index)
{
142
143
144
145
if ((index < 0) || (index >= num_decoders)) {
return NULL;
}
return(music_decoders[index]);
146
147
148
149
}
static void add_music_decoder(const char *decoder)
{
150
151
152
153
154
155
156
157
158
159
160
void *ptr;
int i;
/* Check to see if we already have this decoder */
for (i = 0; i < num_decoders; ++i) {
if (SDL_strcmp(music_decoders[i], decoder) == 0) {
return;
}
}
ptr = SDL_realloc((void *)music_decoders, (num_decoders + 1) * sizeof (const char *));
161
162
163
164
165
if (ptr == NULL) {
return; /* oh well, go on without it. */
}
music_decoders = (const char **) ptr;
music_decoders[num_decoders++] = decoder;
166
167
}
168
/* Local low-level functions prototypes */
169
static void music_internal_initialize_volume(void);
170
static void music_internal_volume(int volume);
171
static int music_internal_play(Mix_Music *music, int play_count, double position);
172
static int music_internal_position(double position);
173
static SDL_bool music_internal_playing(void);
174
static void music_internal_halt(void);
175
176
177
/* Support for hooking when the music has finished */
178
static void (SDLCALL *music_finished_hook)(void) = NULL;
179
180
void Mix_HookMusicFinished(void (SDLCALL *music_finished)(void))
181
{
182
Mix_LockAudio();
183
music_finished_hook = music_finished;
184
Mix_UnlockAudio();
185
186
}
187
188
189
190
191
/* Convenience function to fill audio and mix at the specified volume
This is called from many music player's GetAudio callback.
*/
int music_pcm_getaudio(void *context, void *data, int bytes, int volume,
int (*GetSome)(void *context, void *data, int bytes, SDL_bool *done))
192
{
193
194
195
196
Uint8 *snd = (Uint8 *)data;
Uint8 *dst;
int len = bytes;
SDL_bool done = SDL_FALSE;
197
198
199
200
201
202
203
204
205
206
if (volume == MIX_MAX_VOLUME) {
dst = snd;
} else {
dst = SDL_stack_alloc(Uint8, bytes);
}
while (len > 0 && !done) {
int consumed = GetSome(context, dst, len, &done);
if (consumed < 0) {
break;
207
208
}
209
210
211
212
213
if (volume == MIX_MAX_VOLUME) {
dst += consumed;
} else {
SDL_MixAudioFormat(snd, dst, music_spec.format, (Uint32)consumed, volume);
snd += consumed;
214
}
215
len -= consumed;
216
}
217
218
219
220
if (volume != MIX_MAX_VOLUME) {
SDL_stack_free(dst);
}
return len;
221
222
}
223
/* Mixing function */
224
void SDLCALL music_mixer(void *udata, Uint8 *stream, int len)
225
{
226
while (music_playing && music_active && len > 0) {
227
/* Handle fading */
228
229
if (music_playing->fading != MIX_NO_FADING) {
if (music_playing->fade_step++ < music_playing->fade_steps) {
230
231
232
233
int volume;
int fade_step = music_playing->fade_step;
int fade_steps = music_playing->fade_steps;
234
if (music_playing->fading == MIX_FADING_OUT) {
235
236
237
238
239
240
volume = (music_volume * (fade_steps-fade_step)) / fade_steps;
} else { /* Fading in */
volume = (music_volume * fade_step) / fade_steps;
}
music_internal_volume(volume);
} else {
241
if (music_playing->fading == MIX_FADING_OUT) {
242
music_internal_halt();
243
if (music_finished_hook) {
244
245
246
247
248
249
250
251
music_finished_hook();
}
return;
}
music_playing->fading = MIX_NO_FADING;
}
}
252
253
if (music_playing->interface->GetAudio) {
int left = music_playing->interface->GetAudio(music_playing->context, stream, len);
254
255
if (left != 0) {
/* Either an error or finished playing with data left */
256
257
music_playing->playing = SDL_FALSE;
}
258
259
260
261
262
263
264
265
266
if (left > 0) {
stream += (len - left);
len = left;
} else {
len = 0;
}
} else {
len = 0;
}
267
268
269
270
271
if (!music_internal_playing()) {
music_internal_halt();
if (music_finished_hook) {
music_finished_hook();
272
}
273
274
}
}
275
276
}
277
278
/* Load the music interface libraries for a given music type */
SDL_bool load_music_type(Mix_MusicType type)
279
{
280
int i, loaded = 0;
281
282
for (i = 0; i < SDL_arraysize(s_music_interfaces); ++i) {
Mix_MusicInterface *interface = s_music_interfaces[i];
283
if (interface->type != type) {
284
285
continue;
}
286
287
288
289
290
291
if (!interface->loaded) {
char hint[64];
SDL_snprintf(hint, sizeof(hint), "SDL_MIXER_DISABLE_%s", interface->tag);
if (SDL_GetHintBoolean(hint, SDL_FALSE)) {
continue;
}
292
293
294
295
296
297
298
if (interface->Load && interface->Load() < 0) {
if (SDL_GetHintBoolean(SDL_MIXER_HINT_DEBUG_MUSIC_INTERFACES, SDL_FALSE)) {
SDL_Log("Couldn't load %s: %s\n", interface->tag, Mix_GetError());
}
continue;
}
299
300
interface->loaded = SDL_TRUE;
}
301
++loaded;
302
}
303
return (loaded > 0) ? SDL_TRUE : SDL_FALSE;
304
305
}
306
307
/* Open the music interfaces for a given music type */
SDL_bool open_music_type(Mix_MusicType type)
308
{
309
int i, opened = 0;
310
SDL_bool use_native_midi = SDL_FALSE;
311
312
313
314
if (!music_spec.format) {
/* Music isn't opened yet */
return SDL_FALSE;
315
316
}
317
#ifdef MUSIC_MID_NATIVE
318
if (type == MUS_MID && SDL_GetHintBoolean("SDL_NATIVE_MUSIC", SDL_FALSE) && native_midi_detect()) {
319
use_native_midi = SDL_TRUE;
320
}
321
#endif
322
323
324
325
326
327
for (i = 0; i < SDL_arraysize(s_music_interfaces); ++i) {
Mix_MusicInterface *interface = s_music_interfaces[i];
if (!interface->loaded) {
continue;
}
328
329
330
if (type != MUS_NONE && interface->type != type) {
continue;
}
331
332
333
334
335
if (interface->type == MUS_MID && use_native_midi && interface->api != MIX_MUSIC_NATIVEMIDI) {
continue;
}
336
337
338
339
340
341
342
if (!interface->opened) {
if (interface->Open && interface->Open(&music_spec) < 0) {
if (SDL_GetHintBoolean(SDL_MIXER_HINT_DEBUG_MUSIC_INTERFACES, SDL_FALSE)) {
SDL_Log("Couldn't open %s: %s\n", interface->tag, Mix_GetError());
}
continue;
}
343
344
345
interface->opened = SDL_TRUE;
add_music_decoder(interface->tag);
}
346
++opened;
347
348
}
349
350
if (has_music(MUS_MOD)) {
add_music_decoder("MOD");
351
add_chunk_decoder("MOD");
352
353
354
}
if (has_music(MUS_MID)) {
add_music_decoder("MIDI");
355
356
357
358
359
add_chunk_decoder("MID");
}
if (has_music(MUS_OGG)) {
add_music_decoder("OGG");
add_chunk_decoder("OGG");
360
}
361
362
363
364
if (has_music(MUS_OPUS)) {
add_music_decoder("OPUS");
add_chunk_decoder("OPUS");
}
365
366
if (has_music(MUS_MP3)) {
add_music_decoder("MP3");
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
add_chunk_decoder("MP3");
}
if (has_music(MUS_FLAC)) {
add_music_decoder("FLAC");
add_chunk_decoder("FLAC");
}
return (opened > 0) ? SDL_TRUE : SDL_FALSE;
}
/* Initialize the music interfaces with a certain desired audio format */
void open_music(const SDL_AudioSpec *spec)
{
#ifdef MIX_INIT_SOUNDFONT_PATHS
if (!soundfont_paths) {
soundfont_paths = SDL_strdup(MIX_INIT_SOUNDFONT_PATHS);
383
}
384
385
386
387
388
389
390
391
392
#endif
/* Load the music interfaces that don't have explicit initialization */
load_music_type(MUS_CMD);
load_music_type(MUS_WAV);
/* Open all the interfaces that are loaded */
music_spec = *spec;
open_music_type(MUS_NONE);
393
394
395
396
397
Mix_VolumeMusic(MIX_MAX_VOLUME);
/* Calculate the number of ms for each callback */
ms_per_step = (int) (((float)spec->samples * 1000.0) / spec->freq);
398
}
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/* Return SDL_TRUE if the music type is available */
SDL_bool has_music(Mix_MusicType type)
{
int i;
for (i = 0; i < SDL_arraysize(s_music_interfaces); ++i) {
Mix_MusicInterface *interface = s_music_interfaces[i];
if (interface->type != type) {
continue;
}
if (interface->opened) {
return SDL_TRUE;
}
}
return SDL_FALSE;
414
415
416
417
}
Mix_MusicType detect_music_type_from_magic(const Uint8 *magic)
{
418
/* Ogg Vorbis files have the magic four bytes "OggS" */
419
if (SDL_memcmp(magic, "OggS", 4) == 0) {
420
421
422
423
return MUS_OGG;
}
/* FLAC files have the magic four bytes "fLaC" */
424
if (SDL_memcmp(magic, "fLaC", 4) == 0) {
425
426
427
428
return MUS_FLAC;
}
/* MIDI files have the magic four bytes "MThd" */
429
if (SDL_memcmp(magic, "MThd", 4) == 0) {
430
431
432
return MUS_MID;
}
433
434
if (SDL_memcmp(magic, "ID3", 3) == 0 ||
(magic[0] == 0xFF && (magic[1] & 0xFE) == 0xFA)) {
435
436
437
438
439
440
441
442
443
return MUS_MP3;
}
/* Assume MOD format.
*
* Apparently there is no way to check if the file is really a MOD,
* or there are too many formats supported by MikMod/ModPlug, or
* MikMod/ModPlug does this check by itself. */
return MUS_MOD;
444
445
}
446
447
static Mix_MusicType detect_music_type(SDL_RWops *src)
{
448
Uint8 magic[12];
449
Mix_MusicType t;
450
451
452
453
454
455
456
457
458
459
460
461
462
if (SDL_RWread(src, magic, 1, 12) != 12) {
Mix_SetError("Couldn't read first 12 bytes of audio data");
return MUS_NONE;
}
SDL_RWseek(src, -12, RW_SEEK_CUR);
/* WAVE files have the magic four bytes "RIFF"
AIFF files have the magic 12 bytes "FORM" XXXX "AIFF" */
if (((SDL_memcmp(magic, "RIFF", 4) == 0) && (SDL_memcmp((magic+8), "WAVE", 4) == 0)) ||
(SDL_memcmp(magic, "FORM", 4) == 0)) {
return MUS_WAV;
}
463
464
465
466
467
468
469
470
471
472
473
t = detect_music_type_from_magic(magic);
if (t == MUS_OGG) {
Sint64 pos = SDL_RWtell(src);
SDL_RWseek(src, 28, RW_SEEK_CUR);
SDL_RWread(src, magic, 1, 8);
SDL_RWseek(src, pos, RW_SEEK_SET);
if (SDL_memcmp(magic, "OpusHead", 8) == 0) {
return MUS_OPUS;
}
}
return t;
474
475
}
476
477
478
/* Load a music file */
Mix_Music *Mix_LoadMUS(const char *file)
{
479
480
481
int i;
void *context;
char *ext;
482
Mix_MusicType type;
483
484
485
486
487
488
SDL_RWops *src;
for (i = 0; i < SDL_arraysize(s_music_interfaces); ++i) {
Mix_MusicInterface *interface = s_music_interfaces[i];
if (!interface->opened || !interface->CreateFromFile) {
continue;
489
}
490
491
492
493
494
495
496
497
498
499
500
501
context = interface->CreateFromFile(file);
if (context) {
/* Allocate memory for the music structure */
Mix_Music *music = (Mix_Music *)SDL_calloc(1, sizeof(Mix_Music));
if (music == NULL) {
Mix_SetError("Out of memory");
return NULL;
}
music->interface = interface;
music->context = context;
return music;
502
503
504
}
}
505
src = SDL_RWFromFile(file, "rb");
506
if (src == NULL) {
507
508
509
510
511
512
513
Mix_SetError("Couldn't open '%s'", file);
return NULL;
}
/* Use the extension as a first guess on the file type */
type = MUS_NONE;
ext = strrchr(file, '.');
514
if (ext) {
515
++ext; /* skip the dot in the extension */
516
if (SDL_strcasecmp(ext, "WAV") == 0) {
517
type = MUS_WAV;
518
519
520
} else if (SDL_strcasecmp(ext, "MID") == 0 ||
SDL_strcasecmp(ext, "MIDI") == 0 ||
SDL_strcasecmp(ext, "KAR") == 0) {
521
type = MUS_MID;
522
} else if (SDL_strcasecmp(ext, "OGG") == 0) {
523
type = MUS_OGG;
524
525
} else if (SDL_strcasecmp(ext, "OPUS") == 0) {
type = MUS_OPUS;
526
} else if (SDL_strcasecmp(ext, "FLAC") == 0) {
527
type = MUS_FLAC;
528
529
530
531
} else if (SDL_strcasecmp(ext, "MPG") == 0 ||
SDL_strcasecmp(ext, "MPEG") == 0 ||
SDL_strcasecmp(ext, "MP3") == 0 ||
SDL_strcasecmp(ext, "MAD") == 0) {
532
type = MUS_MP3;
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
} else if (SDL_strcasecmp(ext, "669") == 0 ||
SDL_strcasecmp(ext, "AMF") == 0 ||
SDL_strcasecmp(ext, "AMS") == 0 ||
SDL_strcasecmp(ext, "DBM") == 0 ||
SDL_strcasecmp(ext, "DSM") == 0 ||
SDL_strcasecmp(ext, "FAR") == 0 ||
SDL_strcasecmp(ext, "IT") == 0 ||
SDL_strcasecmp(ext, "MED") == 0 ||
SDL_strcasecmp(ext, "MDL") == 0 ||
SDL_strcasecmp(ext, "MOD") == 0 ||
SDL_strcasecmp(ext, "MOL") == 0 ||
SDL_strcasecmp(ext, "MTM") == 0 ||
SDL_strcasecmp(ext, "NST") == 0 ||
SDL_strcasecmp(ext, "OKT") == 0 ||
SDL_strcasecmp(ext, "PTM") == 0 ||
SDL_strcasecmp(ext, "S3M") == 0 ||
SDL_strcasecmp(ext, "STM") == 0 ||
SDL_strcasecmp(ext, "ULT") == 0 ||
SDL_strcasecmp(ext, "UMX") == 0 ||
SDL_strcasecmp(ext, "WOW") == 0 ||
SDL_strcasecmp(ext, "XM") == 0) {
type = MUS_MOD;
555
556
}
}
557
return Mix_LoadMUSType_RW(src, type, SDL_TRUE);
558
559
}
560
Mix_Music *Mix_LoadMUS_RW(SDL_RWops *src, int freesrc)
561
{
562
return Mix_LoadMUSType_RW(src, MUS_NONE, freesrc);
563
564
}
565
Mix_Music *Mix_LoadMUSType_RW(SDL_RWops *src, Mix_MusicType type, int freesrc)
566
{
567
568
int i;
void *context;
569
Sint64 start;
570
571
if (!src) {
572
573
574
Mix_SetError("RWops pointer is NULL");
return NULL;
}
575
start = SDL_RWtell(src);
576
577
578
579
/* If the caller wants auto-detection, figure out what kind of file
* this is. */
if (type == MUS_NONE) {
580
if ((type = detect_music_type(src)) == MUS_NONE) {
581
/* Don't call Mix_SetError() since detect_music_type() does that. */
582
583
584
if (freesrc) {
SDL_RWclose(src);
}
585
586
587
588
return NULL;
}
}
589
Mix_ClearError();
590
591
592
593
594
595
596
if (load_music_type(type) && open_music_type(type)) {
for (i = 0; i < SDL_arraysize(s_music_interfaces); ++i) {
Mix_MusicInterface *interface = s_music_interfaces[i];
if (!interface->opened || type != interface->type || !interface->CreateFromRW) {
continue;
}
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
context = interface->CreateFromRW(src, freesrc);
if (context) {
/* Allocate memory for the music structure */
Mix_Music *music = (Mix_Music *)SDL_calloc(1, sizeof(Mix_Music));
if (music == NULL) {
interface->Delete(context);
Mix_SetError("Out of memory");
return NULL;
}
music->interface = interface;
music->context = context;
if (SDL_GetHintBoolean(SDL_MIXER_HINT_DEBUG_MUSIC_INTERFACES, SDL_FALSE)) {
SDL_Log("Loaded music with %s\n", interface->tag);
}
return music;
614
}
615
616
617
618
/* Reset the stream for the next decoder */
SDL_RWseek(src, start, RW_SEEK_SET);
}
619
}
620
621
622
if (!*Mix_GetError()) {
Mix_SetError("Unrecognized audio format");
623
}
624
625
626
627
628
629
if (freesrc) {
SDL_RWclose(src);
} else {
SDL_RWseek(src, start, RW_SEEK_SET);
}
return NULL;
630
631
632
633
634
}
/* Free a music chunk previously loaded */
void Mix_FreeMusic(Mix_Music *music)
{
635
if (music) {
636
/* Stop the music if it's currently playing */
637
Mix_LockAudio();
638
if (music == music_playing) {
639
/* Wait for any fade out to finish */
640
while (music->fading == MIX_FADING_OUT) {
641
Mix_UnlockAudio();
642
SDL_Delay(100);
643
Mix_LockAudio();
644
}
645
if (music == music_playing) {
646
647
648
music_internal_halt();
}
}
649
Mix_UnlockAudio();
650
651
music->interface->Delete(music->context);
652
653
SDL_free(music);
}
654
655
}
656
657
658
659
660
/* Find out the music format of a mixer music, or the currently playing
music, if 'music' is NULL.
*/
Mix_MusicType Mix_GetMusicType(const Mix_Music *music)
{
661
662
Mix_MusicType type = MUS_NONE;
663
664
if (music) {
type = music->interface->type;
665
} else {
666
Mix_LockAudio();
667
668
if (music_playing) {
type = music_playing->interface->type;
669
}
670
Mix_UnlockAudio();
671
672
}
return(type);
673
674
}
675
676
/* Play a music chunk. Returns 0, or -1 if there was an error.
*/
677
static int music_internal_play(Mix_Music *music, int play_count, double position)
678
{
679
int retval = 0;
680
681
#if defined(__MACOSX__) && defined(MID_MUSIC_NATIVE)
682
683
684
/* This fixes a bug with native MIDI on Mac OS X, where you
can't really stop and restart MIDI from the audio callback.
*/
685
if (music == music_playing && music->api == MIX_MUSIC_NATIVEMIDI) {
686
687
688
689
690
691
692
/* Just a seek suffices to restart playing */
music_internal_position(position);
return 0;
}
#endif
/* Note the music we're playing */
693
if (music_playing) {
694
695
696
music_internal_halt();
}
music_playing = music;
697
music_playing->playing = SDL_TRUE;
698
699
/* Set the initial volume */
700
music_internal_initialize_volume();
701
702
/* Set up for playback */
703
retval = music->interface->Play(music->context, play_count);
704
705
/* Set the playback position, note any errors if an offset is used */
706
707
708
if (retval == 0) {
if (position > 0.0) {
if (music_internal_position(position) < 0) {
709
710
711
712
713
714
715
716
717
Mix_SetError("Position not implemented for music type");
retval = -1;
}
} else {
music_internal_position(0.0);
}
}
/* If the setup failed, we're not playing any music anymore */
718
if (retval < 0) {
719
music->playing = SDL_FALSE;
720
721
722
music_playing = NULL;
}
return(retval);
723
}
724
725
int Mix_FadeInMusicPos(Mix_Music *music, int loops, int ms, double position)
726
{
727
728
int retval;
729
if (ms_per_step == 0) {
730
731
732
733
734
SDL_SetError("Audio device hasn't been opened");
return(-1);
}
/* Don't play null pointers :-) */
735
if (music == NULL) {
736
737
738
739
740
Mix_SetError("music parameter was NULL");
return(-1);
}
/* Setup the data */
741
if (ms) {
742
743
744
745
746
747
748
749
music->fading = MIX_FADING_IN;
} else {
music->fading = MIX_NO_FADING;
}
music->fade_step = 0;
music->fade_steps = ms/ms_per_step;
/* Play the puppy */
750
Mix_LockAudio();
751
/* If the current music is fading out, wait for the fade to complete */
752
while (music_playing && (music_playing->fading == MIX_FADING_OUT)) {
753
Mix_UnlockAudio();
754
SDL_Delay(100);
755
Mix_LockAudio();
756
}
757
if (loops == 0) {
758
/* Loop is the number of times to play the audio */
759
loops = 1;
760
}
761
retval = music_internal_play(music, loops, position);
762
music_active = (retval == 0);
763
Mix_UnlockAudio();
764
765
return(retval);
766
767
768
}
int Mix_FadeInMusic(Mix_Music *music, int loops, int ms)
{
769
return Mix_FadeInMusicPos(music, loops, ms, 0.0);
770
771
772
}
int Mix_PlayMusic(Mix_Music *music, int loops)
{
773
return Mix_FadeInMusicPos(music, loops, 0, 0.0);
774
775
}
776
777
/* Set the playing music position */
int music_internal_position(double position)
778
{
779
780
if (music_playing->interface->Seek) {
return music_playing->interface->Seek(music_playing->context, position);
781
}
782
return -1;
783
}
784
int Mix_SetMusicPosition(double position)
785
{
786
787
int retval;
788
Mix_LockAudio();
789
if (music_playing) {
790
retval = music_internal_position(position);
791
if (retval < 0) {
792
793
794
795
796
797
Mix_SetError("Position not implemented for music type");
}
} else {
Mix_SetError("Music isn't playing");
retval = -1;
}
798
Mix_UnlockAudio();
799
800
return(retval);
801
802
}
803
804
805
/* Set the music's initial volume */
static void music_internal_initialize_volume(void)
{
806
if (music_playing->fading == MIX_FADING_IN) {
807
808
809
810
music_internal_volume(0);
} else {
music_internal_volume(music_volume);
}
811
812
}
813
/* Set the music volume */
814
static void music_internal_volume(int volume)
815
{
816
817
if (music_playing->interface->SetVolume) {
music_playing->interface->SetVolume(music_playing->context, volume);
818
}
819
820
821
}
int Mix_VolumeMusic(int volume)
{
822
823
824
int prev_volume;
prev_volume = music_volume;
825
if (volume < 0) {
826
827
return prev_volume;
}
828
if (volume > SDL_MIX_MAXVOLUME) {
829
830
831
volume = SDL_MIX_MAXVOLUME;
}
music_volume = volume;
832
Mix_LockAudio();
833
if (music_playing) {
834
835
music_internal_volume(music_volume);
}
836
Mix_UnlockAudio();
837
return(prev_volume);
838
839
}
840
841
/* Halt playing of music */
static void music_internal_halt(void)
842
{
843
844
if (music_playing->interface->Stop) {
music_playing->interface->Stop(music_playing->context);
845
}
846
847
music_playing->playing = SDL_FALSE;
848
849
music_playing->fading = MIX_NO_FADING;
music_playing = NULL;
850
851
852
}
int Mix_HaltMusic(void)
{
853
Mix_LockAudio();
854
if (music_playing) {
855
music_internal_halt();
856
if (music_finished_hook) {
857
858
859
music_finished_hook();
}
}
860
Mix_UnlockAudio();
861
862
return(0);
863
864
}
865
866
867
/* Progressively stop the music */
int Mix_FadeOutMusic(int ms)
{
868
int retval = 0;
869
870
if (ms_per_step == 0) {
871
872
873
SDL_SetError("Audio device hasn't been opened");
return 0;
}
874
875
876
877
878
if (ms <= 0) { /* just halt immediately. */
Mix_HaltMusic();
return 1;
}
879
880
Mix_LockAudio();
881
882
883
884
885
886
887
888
889
890
891
892
893
894
if (music_playing) {
int fade_steps = (ms + ms_per_step - 1) / ms_per_step;
if (music_playing->fading == MIX_NO_FADING) {
music_playing->fade_step = 0;
} else {
int step;
int old_fade_steps = music_playing->fade_steps;
if (music_playing->fading == MIX_FADING_OUT) {
step = music_playing->fade_step;
} else {
step = old_fade_steps - music_playing->fade_step + 1;
}
music_playing->fade_step = (step * fade_steps) / old_fade_steps;
}
895
896
897
898
music_playing->fading = MIX_FADING_OUT;
music_playing->fade_steps = fade_steps;
retval = 1;
}
899
Mix_UnlockAudio();
900
901
return(retval);
902
903
904
905
}
Mix_Fading Mix_FadingMusic(void)
{
906
Mix_Fading fading = MIX_NO_FADING;
907
908
Mix_LockAudio();
909
if (music_playing) {
910
911
fading = music_playing->fading;
}
912
Mix_UnlockAudio();
913
914
return(fading);
915
916
}
917
918
919
/* Pause/Resume the music stream */
void Mix_PauseMusic(void)
{
920
Mix_LockAudio();
921
922
923
924
if (music_playing) {
if (music_playing->interface->Pause) {
music_playing->interface->Pause(music_playing->context);
}
925
}
926
music_active = SDL_FALSE;
927
Mix_UnlockAudio();
928
}
929
930
931
void Mix_ResumeMusic(void)
{
932
Mix_LockAudio();
933
934
935
936
if (music_playing) {
if (music_playing->interface->Resume) {
music_playing->interface->Resume(music_playing->context);
}
937
}
938
music_active = SDL_TRUE;
939
Mix_UnlockAudio();
940
941
942
943
}
void Mix_RewindMusic(void)
{
944
Mix_SetMusicPosition(0.0);
945
946
}
947
948
int Mix_PausedMusic(void)
{
949
return (music_active == SDL_FALSE);
950
951
}
952
/* Check the status of the music */
953
static SDL_bool music_internal_playing(void)
954
{
955
if (!music_playing) {
956
return SDL_FALSE;
957
}
958
959
if (music_playing->interface->IsPlaying) {
960
music_playing->playing = music_playing->interface->IsPlaying(music_playing->context);
961
}
962
return music_playing->playing;
963
964
965
}
int Mix_PlayingMusic(void)
{
966
SDL_bool playing;
967
968
Mix_LockAudio();
969
playing = music_internal_playing();
970
Mix_UnlockAudio();
971
972
return playing ? 1 : 0;
973
974
975
976
977
}
/* Set the external music playback command */
int Mix_SetMusicCMD(const char *command)
{
978
Mix_HaltMusic();
979
if (music_cmd) {
980
981
982
SDL_free(music_cmd);
music_cmd = NULL;
}
983
984
985
986
987
if (command) {
size_t length = SDL_strlen(command) + 1;
music_cmd = (char *)SDL_malloc(length);
if (music_cmd == NULL) {
return SDL_OutOfMemory();
988
}
989
SDL_memcpy(music_cmd, command, length);
990
}
991
return 0;
992
993
}
994
995
int Mix_SetSynchroValue(int i)
{
996
997
/* Not supported by any players at this time */
return(-1);
998
999
1000
}
int Mix_GetSynchroValue(void)