mixer.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 13 Jan 2012 02:39:41 -0500
changeset 560 0fc8dffb86c5
parent 539 e7c80564dda5
child 561 87bdb4c81c0b
permissions -rw-r--r--
Don't do extra memory allocations if we're not going to end up converting the audio.
Added a missing file close.
slouken@0
     1
/*
slouken@518
     2
  SDL_mixer:  An audio mixer library based on the SDL library
slouken@518
     3
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
slouken@0
     4
slouken@518
     5
  This software is provided 'as-is', without any express or implied
slouken@518
     6
  warranty.  In no event will the authors be held liable for any damages
slouken@518
     7
  arising from the use of this software.
slouken@0
     8
slouken@518
     9
  Permission is granted to anyone to use this software for any purpose,
slouken@518
    10
  including commercial applications, and to alter it and redistribute it
slouken@518
    11
  freely, subject to the following restrictions:
slouken@0
    12
slouken@518
    13
  1. The origin of this software must not be misrepresented; you must not
slouken@518
    14
     claim that you wrote the original software. If you use this software
slouken@518
    15
     in a product, an acknowledgment in the product documentation would be
slouken@518
    16
     appreciated but is not required.
slouken@518
    17
  2. Altered source versions must be plainly marked as such, and must not be
slouken@518
    18
     misrepresented as being the original software.
slouken@518
    19
  3. This notice may not be removed or altered from any source distribution.
slouken@0
    20
*/
slouken@0
    21
slouken@140
    22
/* $Id$ */
megastep@7
    23
slouken@0
    24
#include <stdio.h>
slouken@0
    25
#include <stdlib.h>
slouken@0
    26
#include <string.h>
slouken@0
    27
slouken@24
    28
#include "SDL_mutex.h"
slouken@24
    29
#include "SDL_endian.h"
slouken@29
    30
#include "SDL_timer.h"
slouken@0
    31
slouken@34
    32
#include "SDL_mixer.h"
slouken@111
    33
#include "load_aiff.h"
slouken@111
    34
#include "load_voc.h"
slouken@190
    35
#include "load_ogg.h"
slouken@382
    36
#include "load_flac.h"
slouken@470
    37
#include "dynamic_flac.h"
slouken@470
    38
#include "dynamic_mod.h"
slouken@470
    39
#include "dynamic_mp3.h"
slouken@470
    40
#include "dynamic_ogg.h"
slouken@111
    41
icculus@359
    42
#define __MIX_INTERNAL_EFFECT__
icculus@359
    43
#include "effects_internal.h"
icculus@359
    44
slouken@111
    45
/* Magic numbers for various audio file formats */
slouken@117
    46
#define RIFF		0x46464952		/* "RIFF" */
slouken@111
    47
#define WAVE		0x45564157		/* "WAVE" */
slouken@111
    48
#define FORM		0x4d524f46		/* "FORM" */
slouken@190
    49
#define OGGS		0x5367674f		/* "OggS" */
slouken@382
    50
#define CREA		0x61657243		/* "Crea" */
slouken@382
    51
#define FLAC		0x43614C66		/* "fLaC" */
slouken@0
    52
slouken@0
    53
static int audio_opened = 0;
slouken@0
    54
static SDL_AudioSpec mixer;
slouken@113
    55
slouken@113
    56
typedef struct _Mix_effectinfo
slouken@113
    57
{
slouken@113
    58
	Mix_EffectFunc_t callback;
slouken@113
    59
	Mix_EffectDone_t done_callback;
slouken@113
    60
	void *udata;
slouken@113
    61
	struct _Mix_effectinfo *next;
slouken@113
    62
} effect_info;
slouken@113
    63
slouken@0
    64
static struct _Mix_Channel {
slouken@0
    65
	Mix_Chunk *chunk;
slouken@0
    66
	int playing;
slouken@0
    67
	int paused;
slouken@0
    68
	Uint8 *samples;
slouken@0
    69
	int volume;
slouken@0
    70
	int looping;
megastep@7
    71
	int tag;
slouken@42
    72
	Uint32 expire;
megastep@8
    73
	Uint32 start_time;
megastep@4
    74
	Mix_Fading fading;
megastep@4
    75
	int fade_volume;
icculus@443
    76
	int fade_volume_reset;
slouken@42
    77
	Uint32 fade_length;
megastep@4
    78
	Uint32 ticks_fade;
slouken@113
    79
	effect_info *effects;
slouken@60
    80
} *mix_channel = NULL;
slouken@113
    81
slouken@113
    82
static effect_info *posteffects = NULL;
slouken@113
    83
megastep@7
    84
static int num_channels;
slouken@17
    85
static int reserved_channels = 0;
slouken@0
    86
slouken@0
    87
slouken@26
    88
/* Support for hooking into the mixer callback system */
slouken@26
    89
static void (*mix_postmix)(void *udata, Uint8 *stream, int len) = NULL;
slouken@29
    90
static void *mix_postmix_data = NULL;
slouken@26
    91
slouken@92
    92
/* rcg07062001 callback to alert when channels are done playing. */
slouken@92
    93
static void (*channel_done_callback)(int channel) = NULL;
slouken@92
    94
slouken@42
    95
/* Music function declarations */
slouken@42
    96
extern int open_music(SDL_AudioSpec *mixer);
slouken@42
    97
extern void close_music(void);
slouken@42
    98
slouken@0
    99
/* Support for user defined music functions, plus the default one */
slouken@42
   100
extern int volatile music_active;
slouken@0
   101
extern void music_mixer(void *udata, Uint8 *stream, int len);
slouken@0
   102
static void (*mix_music)(void *udata, Uint8 *stream, int len) = music_mixer;
slouken@42
   103
static void *music_data = NULL;
slouken@0
   104
icculus@390
   105
/* rcg06042009 report available decoders at runtime. */
icculus@390
   106
static const char **chunk_decoders = NULL;
icculus@390
   107
static int num_decoders = 0;
icculus@390
   108
chewi@506
   109
/* Semicolon-separated SoundFont paths */
chewi@506
   110
#ifdef MID_MUSIC
chewi@506
   111
extern char* soundfont_paths;
chewi@506
   112
#endif
chewi@506
   113
slouken@466
   114
int Mix_GetNumChunkDecoders(void)
icculus@390
   115
{
icculus@390
   116
	return(num_decoders);
icculus@390
   117
}
icculus@390
   118
icculus@390
   119
const char *Mix_GetChunkDecoder(int index)
icculus@390
   120
{
icculus@390
   121
	if ((index < 0) || (index >= num_decoders)) {
icculus@390
   122
		return NULL;
icculus@390
   123
	}
icculus@390
   124
	return(chunk_decoders[index]);
icculus@390
   125
}
icculus@390
   126
icculus@390
   127
static void add_chunk_decoder(const char *decoder)
icculus@390
   128
{
slouken@412
   129
	void *ptr = realloc(chunk_decoders, (num_decoders + 1) * sizeof (const char **));
icculus@390
   130
	if (ptr == NULL) {
icculus@390
   131
		return;  /* oh well, go on without it. */
icculus@390
   132
	}
icculus@390
   133
	chunk_decoders = (const char **) ptr;
icculus@390
   134
	chunk_decoders[num_decoders++] = decoder;
icculus@390
   135
}
slouken@113
   136
slouken@113
   137
/* rcg06192001 get linked library's version. */
slouken@113
   138
const SDL_version *Mix_Linked_Version(void)
slouken@113
   139
{
slouken@189
   140
	static SDL_version linked_version;
slouken@227
   141
	SDL_MIXER_VERSION(&linked_version);
slouken@189
   142
	return(&linked_version);
slouken@113
   143
}
slouken@113
   144
slouken@470
   145
static int initialized = 0;
slouken@470
   146
slouken@470
   147
int Mix_Init(int flags)
slouken@470
   148
{
slouken@470
   149
	int result = 0;
slouken@470
   150
chewi@506
   151
	if (flags & MIX_INIT_FLUIDSYNTH) {
chewi@506
   152
#ifdef USE_FLUIDSYNTH_MIDI
chewi@506
   153
		if ((initialized & MIX_INIT_FLUIDSYNTH) || Mix_InitFluidSynth() == 0) {
chewi@506
   154
			result |= MIX_INIT_FLUIDSYNTH;
chewi@506
   155
		}
chewi@506
   156
#else
chewi@506
   157
		Mix_SetError("Mixer not built with FluidSynth support");
chewi@506
   158
#endif
chewi@506
   159
	}
slouken@476
   160
	if (flags & MIX_INIT_FLAC) {
slouken@472
   161
#ifdef FLAC_MUSIC
slouken@476
   162
		if ((initialized & MIX_INIT_FLAC) || Mix_InitFLAC() == 0) {
slouken@470
   163
			result |= MIX_INIT_FLAC;
slouken@470
   164
		}
slouken@472
   165
#else
slouken@472
   166
		Mix_SetError("Mixer not built with FLAC support");
slouken@472
   167
#endif
slouken@470
   168
	}
slouken@476
   169
	if (flags & MIX_INIT_MOD) {
slouken@472
   170
#ifdef MOD_MUSIC
slouken@476
   171
		if ((initialized & MIX_INIT_MOD) || Mix_InitMOD() == 0) {
slouken@470
   172
			result |= MIX_INIT_MOD;
slouken@470
   173
		}
slouken@472
   174
#else
slouken@472
   175
		Mix_SetError("Mixer not built with MOD support");
slouken@472
   176
#endif
slouken@470
   177
	}
slouken@476
   178
	if (flags & MIX_INIT_MP3) {
slouken@472
   179
#ifdef MP3_MUSIC
slouken@476
   180
		if ((initialized & MIX_INIT_MP3) || Mix_InitMP3() == 0) {
slouken@470
   181
			result |= MIX_INIT_MP3;
slouken@470
   182
		}
slouken@472
   183
#else
slouken@472
   184
		Mix_SetError("Mixer not built with MP3 support");
slouken@472
   185
#endif
slouken@470
   186
	}
slouken@476
   187
	if (flags & MIX_INIT_OGG) {
slouken@472
   188
#ifdef OGG_MUSIC
slouken@476
   189
		if ((initialized & MIX_INIT_OGG) || Mix_InitOgg() == 0) {
slouken@470
   190
			result |= MIX_INIT_OGG;
slouken@470
   191
		}
slouken@472
   192
#else
slouken@472
   193
		Mix_SetError("Mixer not built with Ogg Vorbis support");
slouken@472
   194
#endif
slouken@470
   195
	}
slouken@470
   196
	initialized |= result;
slouken@470
   197
slouken@470
   198
	return (result);
slouken@470
   199
}
slouken@470
   200
slouken@470
   201
void Mix_Quit()
slouken@470
   202
{
chewi@506
   203
#ifdef USE_FLUIDSYNTH_MIDI
chewi@506
   204
	if (initialized & MIX_INIT_FLUIDSYNTH) {
chewi@506
   205
		Mix_QuitFluidSynth();
chewi@506
   206
	}
chewi@506
   207
#endif
slouken@472
   208
#ifdef FLAC_MUSIC
slouken@470
   209
	if (initialized & MIX_INIT_FLAC) {
slouken@470
   210
		Mix_QuitFLAC();
slouken@470
   211
	}
slouken@472
   212
#endif
slouken@472
   213
#ifdef MOD_MUSIC
slouken@470
   214
	if (initialized & MIX_INIT_MOD) {
slouken@470
   215
		Mix_QuitMOD();
slouken@470
   216
	}
slouken@472
   217
#endif
slouken@472
   218
#ifdef MP3_MUSIC
slouken@470
   219
	if (initialized & MIX_INIT_MP3) {
slouken@470
   220
		Mix_QuitMP3();
slouken@470
   221
	}
slouken@472
   222
#endif
slouken@472
   223
#ifdef OGG_MUSIC
slouken@470
   224
	if (initialized & MIX_INIT_OGG) {
slouken@470
   225
		Mix_QuitOgg();
slouken@470
   226
	}
slouken@472
   227
#endif
chewi@506
   228
#ifdef MID_MUSIC
chewi@506
   229
	if (soundfont_paths) {
chewi@506
   230
		free(soundfont_paths);
chewi@506
   231
	}
chewi@506
   232
#endif
slouken@470
   233
	initialized = 0;
slouken@470
   234
}
slouken@470
   235
slouken@164
   236
static int _Mix_remove_all_effects(int channel, effect_info **e);
slouken@113
   237
slouken@172
   238
/*
slouken@172
   239
 * rcg06122001 Cleanup effect callbacks.
slouken@172
   240
 *  MAKE SURE SDL_LockAudio() is called before this (or you're in the
slouken@172
   241
 *   audio callback).
slouken@172
   242
 */
slouken@172
   243
static void _Mix_channel_done_playing(int channel)
slouken@113
   244
{
slouken@113
   245
	if (channel_done_callback) {
slouken@113
   246
	    channel_done_callback(channel);
slouken@113
   247
	}
slouken@113
   248
slouken@164
   249
	/*
slouken@172
   250
	 * Call internal function directly, to avoid locking audio from
slouken@172
   251
	 *   inside audio callback.
slouken@172
   252
	 */
slouken@164
   253
	_Mix_remove_all_effects(channel, &mix_channel[channel].effects);
slouken@113
   254
}
slouken@113
   255
slouken@113
   256
slouken@113
   257
static void *Mix_DoEffects(int chan, void *snd, int len)
slouken@113
   258
{
slouken@113
   259
	int posteffect = (chan == MIX_CHANNEL_POST);
slouken@113
   260
	effect_info *e = ((posteffect) ? posteffects : mix_channel[chan].effects);
slouken@113
   261
	void *buf = snd;
slouken@113
   262
slouken@113
   263
	if (e != NULL) {    /* are there any registered effects? */
slouken@113
   264
		/* if this is the postmix, we can just overwrite the original. */
slouken@113
   265
		if (!posteffect) {
slouken@113
   266
			buf = malloc(len);
slouken@113
   267
			if (buf == NULL) {
slouken@113
   268
				return(snd);
slouken@113
   269
			}
slouken@113
   270
		    memcpy(buf, snd, len);
slouken@113
   271
		}
slouken@113
   272
slouken@113
   273
		for (; e != NULL; e = e->next) {
slouken@113
   274
			if (e->callback != NULL) {
slouken@113
   275
				e->callback(chan, buf, len, e->udata);
slouken@113
   276
			}
slouken@113
   277
		}
slouken@113
   278
	}
slouken@113
   279
slouken@113
   280
	/* be sure to free() the return value if != snd ... */
slouken@113
   281
	return(buf);
slouken@113
   282
}
slouken@113
   283
slouken@113
   284
slouken@0
   285
/* Mixing function */
slouken@0
   286
static void mix_channels(void *udata, Uint8 *stream, int len)
slouken@0
   287
{
slouken@113
   288
	Uint8 *mix_input;
slouken@373
   289
	int i, mixable, volume = SDL_MIX_MAXVOLUME;
megastep@7
   290
	Uint32 sdl_ticks;
slouken@0
   291
slouken@364
   292
#if SDL_VERSION_ATLEAST(1, 3, 0)
slouken@364
   293
	/* Need to initialize the stream in SDL 1.3+ */
slouken@363
   294
	memset(stream, mixer.silence, len);
slouken@364
   295
#endif
slouken@345
   296
slouken@15
   297
	/* Mix the music (must be done before the channels are added) */
slouken@19
   298
	if ( music_active || (mix_music != music_mixer) ) {
slouken@15
   299
		mix_music(music_data, stream, len);
slouken@15
   300
	}
slouken@15
   301
slouken@172
   302
	/* Mix any playing channels... */
megastep@7
   303
	sdl_ticks = SDL_GetTicks();
megastep@7
   304
	for ( i=0; i<num_channels; ++i ) {
slouken@60
   305
		if( ! mix_channel[i].paused ) {
slouken@60
   306
			if ( mix_channel[i].expire > 0 && mix_channel[i].expire < sdl_ticks ) {
megastep@8
   307
				/* Expiration delay for that channel is reached */
slouken@60
   308
				mix_channel[i].playing = 0;
icculus@539
   309
				mix_channel[i].looping = 0;
slouken@60
   310
				mix_channel[i].fading = MIX_NO_FADING;
slouken@60
   311
				mix_channel[i].expire = 0;
slouken@219
   312
				_Mix_channel_done_playing(i);
slouken@60
   313
			} else if ( mix_channel[i].fading != MIX_NO_FADING ) {
slouken@60
   314
				Uint32 ticks = sdl_ticks - mix_channel[i].ticks_fade;
slouken@60
   315
				if( ticks > mix_channel[i].fade_length ) {
icculus@443
   316
				    Mix_Volume(i, mix_channel[i].fade_volume_reset); /* Restore the volume */
slouken@60
   317
					if( mix_channel[i].fading == MIX_FADING_OUT ) {
slouken@60
   318
						mix_channel[i].playing = 0;
icculus@539
   319
						mix_channel[i].looping = 0;
slouken@60
   320
						mix_channel[i].expire = 0;
slouken@219
   321
						_Mix_channel_done_playing(i);
megastep@8
   322
					}
slouken@60
   323
					mix_channel[i].fading = MIX_NO_FADING;
megastep@4
   324
				} else {
slouken@60
   325
					if( mix_channel[i].fading == MIX_FADING_OUT ) {
slouken@60
   326
						Mix_Volume(i, (mix_channel[i].fade_volume * (mix_channel[i].fade_length-ticks))
slouken@60
   327
								   / mix_channel[i].fade_length );
megastep@8
   328
					} else {
slouken@60
   329
						Mix_Volume(i, (mix_channel[i].fade_volume * ticks) / mix_channel[i].fade_length );
megastep@8
   330
					}
megastep@4
   331
				}
megastep@4
   332
			}
slouken@60
   333
			if ( mix_channel[i].playing > 0 ) {
slouken@188
   334
				int index = 0;
slouken@188
   335
				int remaining = len;
slouken@188
   336
				while (mix_channel[i].playing > 0 && index < len) {
slouken@188
   337
					remaining = len - index;
slouken@188
   338
					volume = (mix_channel[i].volume*mix_channel[i].chunk->volume) / MIX_MAX_VOLUME;
slouken@188
   339
					mixable = mix_channel[i].playing;
slouken@188
   340
					if ( mixable > remaining ) {
slouken@188
   341
						mixable = remaining;
slouken@188
   342
					}
slouken@188
   343
slouken@188
   344
					mix_input = Mix_DoEffects(i, mix_channel[i].samples, mixable);
slouken@188
   345
					SDL_MixAudio(stream+index,mix_input,mixable,volume);
slouken@188
   346
					if (mix_input != mix_channel[i].samples)
slouken@188
   347
						free(mix_input);
slouken@188
   348
slouken@188
   349
					mix_channel[i].samples += mixable;
slouken@188
   350
					mix_channel[i].playing -= mixable;
slouken@188
   351
					index += mixable;
slouken@188
   352
slouken@188
   353
					/* rcg06072001 Alert app if channel is done playing. */
slouken@188
   354
					if (!mix_channel[i].playing && !mix_channel[i].looping) {
slouken@188
   355
						_Mix_channel_done_playing(i);
slouken@188
   356
					}
slouken@45
   357
				}
slouken@113
   358
megastep@21
   359
				/* If looping the sample and we are at its end, make sure
megastep@21
   360
				   we will still return a full buffer */
slouken@188
   361
				while ( mix_channel[i].looping && index < len ) {
slouken@60
   362
					int alen = mix_channel[i].chunk->alen;
slouken@188
   363
					remaining = len - index;
slouken@356
   364
					if (remaining > alen) {
slouken@45
   365
						remaining = alen;
slouken@356
   366
					}
slouken@113
   367
slouken@113
   368
					mix_input = Mix_DoEffects(i, mix_channel[i].chunk->abuf, remaining);
slouken@188
   369
					SDL_MixAudio(stream+index, mix_input, remaining, volume);
slouken@113
   370
					if (mix_input != mix_channel[i].chunk->abuf)
slouken@113
   371
						free(mix_input);
slouken@113
   372
slouken@60
   373
					--mix_channel[i].looping;
slouken@60
   374
					mix_channel[i].samples = mix_channel[i].chunk->abuf + remaining;
slouken@60
   375
					mix_channel[i].playing = mix_channel[i].chunk->alen - remaining;
slouken@188
   376
					index += remaining;
slouken@45
   377
				}
slouken@60
   378
				if ( ! mix_channel[i].playing && mix_channel[i].looping ) {
slouken@356
   379
					--mix_channel[i].looping;
slouken@356
   380
					mix_channel[i].samples = mix_channel[i].chunk->abuf;
slouken@356
   381
					mix_channel[i].playing = mix_channel[i].chunk->alen;
slouken@0
   382
				}
slouken@0
   383
			}
slouken@0
   384
		}
slouken@0
   385
	}
slouken@113
   386
slouken@113
   387
	/* rcg06122001 run posteffects... */
slouken@113
   388
	Mix_DoEffects(MIX_CHANNEL_POST, stream, len);
slouken@113
   389
slouken@26
   390
	if ( mix_postmix ) {
slouken@26
   391
		mix_postmix(mix_postmix_data, stream, len);
slouken@26
   392
	}
slouken@0
   393
}
slouken@0
   394
slouken@373
   395
#if 0
slouken@0
   396
static void PrintFormat(char *title, SDL_AudioSpec *fmt)
slouken@0
   397
{
slouken@0
   398
	printf("%s: %d bit %s audio (%s) at %u Hz\n", title, (fmt->format&0xFF),
slouken@0
   399
			(fmt->format&0x8000) ? "signed" : "unsigned",
slouken@245
   400
			(fmt->channels > 2) ? "surround" :
slouken@0
   401
			(fmt->channels > 1) ? "stereo" : "mono", fmt->freq);
slouken@0
   402
}
slouken@373
   403
#endif
slouken@0
   404
slouken@113
   405
slouken@0
   406
/* Open the mixer with a certain desired audio format */
slouken@60
   407
int Mix_OpenAudio(int frequency, Uint16 format, int nchannels, int chunksize)
slouken@0
   408
{
slouken@0
   409
	int i;
slouken@0
   410
	SDL_AudioSpec desired;
slouken@0
   411
slouken@0
   412
	/* If the mixer is already opened, increment open count */
slouken@0
   413
	if ( audio_opened ) {
slouken@300
   414
		if ( format == mixer.format && nchannels == mixer.channels ) {
slouken@498
   415
			++audio_opened;
slouken@498
   416
			return(0);
slouken@300
   417
		}
slouken@300
   418
		while ( audio_opened ) {
slouken@300
   419
			Mix_CloseAudio();
slouken@300
   420
		}
slouken@0
   421
	}
slouken@0
   422
slouken@0
   423
	/* Set the desired format and frequency */
slouken@0
   424
	desired.freq = frequency;
slouken@0
   425
	desired.format = format;
slouken@60
   426
	desired.channels = nchannels;
slouken@0
   427
	desired.samples = chunksize;
slouken@0
   428
	desired.callback = mix_channels;
slouken@0
   429
	desired.userdata = NULL;
slouken@0
   430
slouken@0
   431
	/* Accept nearly any audio format */
slouken@0
   432
	if ( SDL_OpenAudio(&desired, &mixer) < 0 ) {
slouken@0
   433
		return(-1);
slouken@0
   434
	}
slouken@0
   435
#if 0
slouken@0
   436
	PrintFormat("Audio device", &mixer);
slouken@0
   437
#endif
slouken@0
   438
slouken@0
   439
	/* Initialize the music players */
slouken@0
   440
	if ( open_music(&mixer) < 0 ) {
slouken@0
   441
		SDL_CloseAudio();
slouken@0
   442
		return(-1);
slouken@0
   443
	}
megastep@7
   444
megastep@7
   445
	num_channels = MIX_CHANNELS;
slouken@60
   446
	mix_channel = (struct _Mix_Channel *) malloc(num_channels * sizeof(struct _Mix_Channel));
megastep@7
   447
slouken@0
   448
	/* Clear out the audio channels */
megastep@7
   449
	for ( i=0; i<num_channels; ++i ) {
slouken@60
   450
		mix_channel[i].chunk = NULL;
slouken@60
   451
		mix_channel[i].playing = 0;
slouken@60
   452
		mix_channel[i].looping = 0;
slouken@60
   453
		mix_channel[i].volume = SDL_MIX_MAXVOLUME;
slouken@183
   454
		mix_channel[i].fade_volume = SDL_MIX_MAXVOLUME;
icculus@443
   455
		mix_channel[i].fade_volume_reset = SDL_MIX_MAXVOLUME;
slouken@183
   456
		mix_channel[i].fading = MIX_NO_FADING;
slouken@60
   457
		mix_channel[i].tag = -1;
slouken@60
   458
		mix_channel[i].expire = 0;
slouken@113
   459
		mix_channel[i].effects = NULL;
slouken@198
   460
		mix_channel[i].paused = 0;
slouken@0
   461
	}
slouken@0
   462
	Mix_VolumeMusic(SDL_MIX_MAXVOLUME);
slouken@113
   463
slouken@113
   464
	_Mix_InitEffects();
slouken@113
   465
icculus@390
   466
	/* This list is (currently) decided at build time. */
icculus@390
   467
	add_chunk_decoder("WAVE");
icculus@390
   468
	add_chunk_decoder("AIFF");
icculus@390
   469
	add_chunk_decoder("VOC");
icculus@390
   470
#ifdef OGG_MUSIC
icculus@390
   471
	add_chunk_decoder("OGG");
icculus@390
   472
#endif
icculus@390
   473
#ifdef FLAC_MUSIC
icculus@390
   474
	add_chunk_decoder("FLAC");
icculus@390
   475
#endif
icculus@390
   476
slouken@0
   477
	audio_opened = 1;
slouken@0
   478
	SDL_PauseAudio(0);
slouken@0
   479
	return(0);
slouken@0
   480
}
slouken@0
   481
megastep@7
   482
/* Dynamically change the number of channels managed by the mixer.
megastep@7
   483
   If decreasing the number of channels, the upper channels are
megastep@7
   484
   stopped.
megastep@7
   485
 */
megastep@7
   486
int Mix_AllocateChannels(int numchans)
megastep@7
   487
{
megastep@7
   488
	if ( numchans<0 || numchans==num_channels )
megastep@7
   489
		return(num_channels);
megastep@7
   490
megastep@7
   491
	if ( numchans < num_channels ) {
megastep@7
   492
		/* Stop the affected channels */
megastep@7
   493
		int i;
megastep@7
   494
		for(i=numchans; i < num_channels; i++) {
icculus@361
   495
			Mix_UnregisterAllEffects(i);
megastep@7
   496
			Mix_HaltChannel(i);
megastep@7
   497
		}
megastep@7
   498
	}
slouken@172
   499
	SDL_LockAudio();
slouken@60
   500
	mix_channel = (struct _Mix_Channel *) realloc(mix_channel, numchans * sizeof(struct _Mix_Channel));
megastep@7
   501
	if ( numchans > num_channels ) {
megastep@7
   502
		/* Initialize the new channels */
megastep@7
   503
		int i;
megastep@7
   504
		for(i=num_channels; i < numchans; i++) {
slouken@60
   505
			mix_channel[i].chunk = NULL;
slouken@60
   506
			mix_channel[i].playing = 0;
slouken@60
   507
			mix_channel[i].looping = 0;
slouken@60
   508
			mix_channel[i].volume = SDL_MIX_MAXVOLUME;
slouken@183
   509
			mix_channel[i].fade_volume = SDL_MIX_MAXVOLUME;
icculus@443
   510
			mix_channel[i].fade_volume_reset = SDL_MIX_MAXVOLUME;
slouken@183
   511
			mix_channel[i].fading = MIX_NO_FADING;
slouken@60
   512
			mix_channel[i].tag = -1;
slouken@60
   513
			mix_channel[i].expire = 0;
slouken@113
   514
			mix_channel[i].effects = NULL;
slouken@198
   515
			mix_channel[i].paused = 0;
megastep@7
   516
		}
megastep@7
   517
	}
megastep@7
   518
	num_channels = numchans;
slouken@172
   519
	SDL_UnlockAudio();
megastep@7
   520
	return(num_channels);
megastep@7
   521
}
megastep@7
   522
slouken@0
   523
/* Return the actual mixer parameters */
slouken@0
   524
int Mix_QuerySpec(int *frequency, Uint16 *format, int *channels)
slouken@0
   525
{
slouken@0
   526
	if ( audio_opened ) {
slouken@0
   527
		if ( frequency ) {
slouken@0
   528
			*frequency = mixer.freq;
slouken@0
   529
		}
slouken@0
   530
		if ( format ) {
slouken@0
   531
			*format = mixer.format;
slouken@0
   532
		}
slouken@79
   533
		if ( channels ) {
slouken@0
   534
			*channels = mixer.channels;
slouken@0
   535
		}
slouken@0
   536
	}
slouken@0
   537
	return(audio_opened);
slouken@0
   538
}
slouken@0
   539
slouken@91
   540
slouken@91
   541
/*
slouken@91
   542
 * !!! FIXME: Ideally, we want a Mix_LoadSample_RW(), which will handle the
slouken@91
   543
 *             generic setup, then call the correct file format loader.
slouken@91
   544
 */
slouken@91
   545
slouken@0
   546
/* Load a wave file */
slouken@0
   547
Mix_Chunk *Mix_LoadWAV_RW(SDL_RWops *src, int freesrc)
slouken@0
   548
{
slouken@111
   549
	Uint32 magic;
slouken@0
   550
	Mix_Chunk *chunk;
slouken@111
   551
	SDL_AudioSpec wavespec, *loaded;
slouken@0
   552
	SDL_AudioCVT wavecvt;
slouken@41
   553
	int samplesize;
slouken@0
   554
slouken@91
   555
	/* rcg06012001 Make sure src is valid */
slouken@91
   556
	if ( ! src ) {
slouken@111
   557
		SDL_SetError("Mix_LoadWAV_RW with NULL src");
slouken@91
   558
		return(NULL);
slouken@91
   559
	}
slouken@91
   560
slouken@0
   561
	/* Make sure audio has been opened */
slouken@0
   562
	if ( ! audio_opened ) {
slouken@0
   563
		SDL_SetError("Audio device hasn't been opened");
slouken@89
   564
		if ( freesrc && src ) {
slouken@0
   565
			SDL_RWclose(src);
slouken@0
   566
		}
slouken@0
   567
		return(NULL);
slouken@0
   568
	}
slouken@0
   569
slouken@0
   570
	/* Allocate the chunk memory */
slouken@0
   571
	chunk = (Mix_Chunk *)malloc(sizeof(Mix_Chunk));
slouken@0
   572
	if ( chunk == NULL ) {
slouken@0
   573
		SDL_SetError("Out of memory");
slouken@0
   574
		if ( freesrc ) {
slouken@0
   575
			SDL_RWclose(src);
slouken@0
   576
		}
slouken@0
   577
		return(NULL);
slouken@0
   578
	}
slouken@0
   579
slouken@111
   580
	/* Find out what kind of audio file this is */
slouken@111
   581
	magic = SDL_ReadLE32(src);
slouken@111
   582
	/* Seek backwards for compatibility with older loaders */
slouken@473
   583
	SDL_RWseek(src, -(int)sizeof(Uint32), RW_SEEK_CUR);
slouken@111
   584
slouken@111
   585
	switch (magic) {
slouken@111
   586
		case WAVE:
slouken@117
   587
		case RIFF:
slouken@111
   588
			loaded = SDL_LoadWAV_RW(src, freesrc, &wavespec,
slouken@111
   589
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@111
   590
			break;
slouken@111
   591
		case FORM:
slouken@111
   592
			loaded = Mix_LoadAIFF_RW(src, freesrc, &wavespec,
slouken@111
   593
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@111
   594
			break;
slouken@190
   595
#ifdef OGG_MUSIC
slouken@190
   596
		case OGGS:
slouken@190
   597
			loaded = Mix_LoadOGG_RW(src, freesrc, &wavespec,
slouken@190
   598
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@190
   599
			break;
slouken@190
   600
#endif
slouken@382
   601
#ifdef FLAC_MUSIC
slouken@382
   602
		case FLAC:
slouken@382
   603
			loaded = Mix_LoadFLAC_RW(src, freesrc, &wavespec,
slouken@382
   604
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@382
   605
			break;
slouken@382
   606
#endif
icculus@191
   607
		case CREA:
slouken@111
   608
			loaded = Mix_LoadVOC_RW(src, freesrc, &wavespec,
slouken@111
   609
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@111
   610
			break;
icculus@191
   611
		default:
icculus@191
   612
			SDL_SetError("Unrecognized sound file type");
icculus@191
   613
			return(0);			
slouken@111
   614
	}
slouken@111
   615
	if ( !loaded ) {
slouken@0
   616
		free(chunk);
slouken@560
   617
		if ( freesrc ) {
slouken@560
   618
			SDL_RWclose(src);
slouken@560
   619
		}
slouken@0
   620
		return(NULL);
slouken@0
   621
	}
slouken@91
   622
slouken@0
   623
#if 0
slouken@0
   624
	PrintFormat("Audio device", &mixer);
slouken@0
   625
	PrintFormat("-- Wave file", &wavespec);
slouken@0
   626
#endif
slouken@0
   627
slouken@0
   628
	/* Build the audio converter and create conversion buffers */
slouken@560
   629
	if ( wavespec.format != mixer.format ||
slouken@560
   630
		 wavespec.channels != mixer.channels ||
slouken@560
   631
		 wavespec.freq != mixer.freq ) {
slouken@560
   632
		if ( SDL_BuildAudioCVT(&wavecvt,
slouken@560
   633
				wavespec.format, wavespec.channels, wavespec.freq,
slouken@560
   634
				mixer.format, mixer.channels, mixer.freq) < 0 ) {
slouken@560
   635
			SDL_FreeWAV(chunk->abuf);
slouken@560
   636
			free(chunk);
slouken@560
   637
			return(NULL);
slouken@560
   638
		}
slouken@560
   639
		samplesize = ((wavespec.format & 0xFF)/8)*wavespec.channels;
slouken@560
   640
		wavecvt.len = chunk->alen & ~(samplesize-1);
slouken@560
   641
		wavecvt.buf = (Uint8 *)calloc(1, wavecvt.len*wavecvt.len_mult);
slouken@560
   642
		if ( wavecvt.buf == NULL ) {
slouken@560
   643
			SDL_SetError("Out of memory");
slouken@560
   644
			SDL_FreeWAV(chunk->abuf);
slouken@560
   645
			free(chunk);
slouken@560
   646
			return(NULL);
slouken@560
   647
		}
slouken@560
   648
		memcpy(wavecvt.buf, chunk->abuf, chunk->alen);
slouken@0
   649
		SDL_FreeWAV(chunk->abuf);
slouken@560
   650
slouken@560
   651
		/* Run the audio converter */
slouken@560
   652
		if ( SDL_ConvertAudio(&wavecvt) < 0 ) {
slouken@560
   653
			free(wavecvt.buf);
slouken@560
   654
			free(chunk);
slouken@560
   655
			return(NULL);
slouken@560
   656
		}
slouken@0
   657
	}
slouken@0
   658
slouken@1
   659
	chunk->allocated = 1;
slouken@0
   660
	chunk->abuf = wavecvt.buf;
slouken@0
   661
	chunk->alen = wavecvt.len_cvt;
slouken@0
   662
	chunk->volume = MIX_MAX_VOLUME;
icculus@516
   663
slouken@0
   664
	return(chunk);
slouken@0
   665
}
slouken@0
   666
slouken@1
   667
/* Load a wave file of the mixer format from a memory buffer */
slouken@1
   668
Mix_Chunk *Mix_QuickLoad_WAV(Uint8 *mem)
slouken@1
   669
{
slouken@1
   670
	Mix_Chunk *chunk;
slouken@1
   671
	Uint8 magic[4];
slouken@1
   672
slouken@1
   673
	/* Make sure audio has been opened */
slouken@1
   674
	if ( ! audio_opened ) {
slouken@1
   675
		SDL_SetError("Audio device hasn't been opened");
slouken@1
   676
		return(NULL);
slouken@1
   677
	}
slouken@1
   678
slouken@1
   679
	/* Allocate the chunk memory */
patmandin@338
   680
	chunk = (Mix_Chunk *)calloc(1,sizeof(Mix_Chunk));
slouken@1
   681
	if ( chunk == NULL ) {
slouken@1
   682
		SDL_SetError("Out of memory");
slouken@1
   683
		return(NULL);
slouken@1
   684
	}
slouken@1
   685
slouken@1
   686
	/* Essentially just skip to the audio data (no error checking - fast) */
slouken@1
   687
	chunk->allocated = 0;
slouken@1
   688
	mem += 12; /* WAV header */
slouken@1
   689
	do {
slouken@1
   690
		memcpy(magic, mem, 4);
slouken@1
   691
		mem += 4;
slouken@1
   692
		chunk->alen = ((mem[3]<<24)|(mem[2]<<16)|(mem[1]<<8)|(mem[0]));
slouken@1
   693
		mem += 4;
slouken@1
   694
		chunk->abuf = mem;
slouken@1
   695
		mem += chunk->alen;
slouken@1
   696
	} while ( memcmp(magic, "data", 4) != 0 );
slouken@1
   697
	chunk->volume = MIX_MAX_VOLUME;
slouken@1
   698
slouken@1
   699
	return(chunk);
slouken@1
   700
}
slouken@1
   701
slouken@174
   702
/* Load raw audio data of the mixer format from a memory buffer */
slouken@174
   703
Mix_Chunk *Mix_QuickLoad_RAW(Uint8 *mem, Uint32 len)
slouken@174
   704
{
slouken@174
   705
	Mix_Chunk *chunk;
slouken@174
   706
slouken@174
   707
	/* Make sure audio has been opened */
slouken@174
   708
	if ( ! audio_opened ) {
slouken@174
   709
		SDL_SetError("Audio device hasn't been opened");
slouken@174
   710
		return(NULL);
slouken@174
   711
	}
slouken@174
   712
slouken@174
   713
	/* Allocate the chunk memory */
slouken@174
   714
	chunk = (Mix_Chunk *)malloc(sizeof(Mix_Chunk));
slouken@174
   715
	if ( chunk == NULL ) {
slouken@174
   716
		SDL_SetError("Out of memory");
slouken@174
   717
		return(NULL);
slouken@174
   718
	}
slouken@174
   719
slouken@174
   720
	/* Essentially just point at the audio data (no error checking - fast) */
slouken@174
   721
	chunk->allocated = 0;
slouken@174
   722
	chunk->alen = len;
slouken@174
   723
	chunk->abuf = mem;
slouken@174
   724
	chunk->volume = MIX_MAX_VOLUME;
slouken@174
   725
slouken@174
   726
	return(chunk);
slouken@174
   727
}
slouken@174
   728
slouken@0
   729
/* Free an audio chunk previously loaded */
slouken@0
   730
void Mix_FreeChunk(Mix_Chunk *chunk)
slouken@0
   731
{
slouken@0
   732
	int i;
slouken@0
   733
slouken@0
   734
	/* Caution -- if the chunk is playing, the mixer will crash */
slouken@0
   735
	if ( chunk ) {
slouken@0
   736
		/* Guarantee that this chunk isn't playing */
slouken@172
   737
		SDL_LockAudio();
slouken@60
   738
		if ( mix_channel ) {
slouken@60
   739
			for ( i=0; i<num_channels; ++i ) {
slouken@60
   740
				if ( chunk == mix_channel[i].chunk ) {
slouken@60
   741
					mix_channel[i].playing = 0;
icculus@539
   742
					mix_channel[i].looping = 0;
slouken@60
   743
				}
slouken@0
   744
			}
slouken@0
   745
		}
slouken@172
   746
		SDL_UnlockAudio();
slouken@0
   747
		/* Actually free the chunk */
slouken@1
   748
		if ( chunk->allocated ) {
slouken@1
   749
			free(chunk->abuf);
slouken@1
   750
		}
slouken@0
   751
		free(chunk);
slouken@0
   752
	}
slouken@0
   753
}
slouken@0
   754
slouken@26
   755
/* Set a function that is called after all mixing is performed.
slouken@26
   756
   This can be used to provide real-time visual display of the audio stream
slouken@26
   757
   or add a custom mixer filter for the stream data.
slouken@26
   758
*/
slouken@26
   759
void Mix_SetPostMix(void (*mix_func)
slouken@26
   760
                    (void *udata, Uint8 *stream, int len), void *arg)
slouken@26
   761
{
slouken@26
   762
	SDL_LockAudio();
slouken@26
   763
	mix_postmix_data = arg;
slouken@26
   764
	mix_postmix = mix_func;
slouken@26
   765
	SDL_UnlockAudio();
slouken@26
   766
}
slouken@26
   767
slouken@0
   768
/* Add your own music player or mixer function.
slouken@0
   769
   If 'mix_func' is NULL, the default music player is re-enabled.
slouken@0
   770
 */
slouken@0
   771
void Mix_HookMusic(void (*mix_func)(void *udata, Uint8 *stream, int len),
slouken@0
   772
                                                                void *arg)
slouken@0
   773
{
slouken@0
   774
	SDL_LockAudio();
slouken@0
   775
	if ( mix_func != NULL ) {
slouken@0
   776
		music_data = arg;
slouken@0
   777
		mix_music = mix_func;
slouken@0
   778
	} else {
slouken@0
   779
		music_data = NULL;
slouken@0
   780
		mix_music = music_mixer;
slouken@0
   781
	}
slouken@0
   782
	SDL_UnlockAudio();
slouken@0
   783
}
slouken@0
   784
slouken@0
   785
void *Mix_GetMusicHookData(void)
slouken@0
   786
{
slouken@0
   787
	return(music_data);
slouken@0
   788
}
slouken@0
   789
slouken@92
   790
void Mix_ChannelFinished(void (*channel_finished)(int channel))
slouken@92
   791
{
slouken@172
   792
	SDL_LockAudio();
slouken@172
   793
	channel_done_callback = channel_finished;
slouken@172
   794
	SDL_UnlockAudio();
slouken@92
   795
}
slouken@92
   796
slouken@92
   797
slouken@0
   798
/* Reserve the first channels (0 -> n-1) for the application, i.e. don't allocate
slouken@0
   799
   them dynamically to the next sample if requested with a -1 value below.
slouken@0
   800
   Returns the number of reserved channels.
slouken@0
   801
 */
slouken@0
   802
int Mix_ReserveChannels(int num)
slouken@0
   803
{
megastep@7
   804
	if (num > num_channels)
megastep@7
   805
		num = num_channels;
slouken@0
   806
	reserved_channels = num;
slouken@0
   807
	return num;
slouken@0
   808
}
slouken@0
   809
slouken@245
   810
static int checkchunkintegral(Mix_Chunk *chunk)
slouken@245
   811
{
slouken@245
   812
	int frame_width = 1;
slouken@245
   813
slouken@245
   814
	if ((mixer.format & 0xFF) == 16) frame_width = 2;
slouken@245
   815
	frame_width *= mixer.channels;
slouken@245
   816
	while (chunk->alen % frame_width) chunk->alen--;
slouken@245
   817
	return chunk->alen;
slouken@245
   818
}
slouken@245
   819
slouken@0
   820
/* Play an audio chunk on a specific channel.
slouken@0
   821
   If the specified channel is -1, play on the first free channel.
megastep@7
   822
   'ticks' is the number of milliseconds at most to play the sample, or -1
megastep@7
   823
   if there is no limit.
slouken@0
   824
   Returns which channel was used to play the sound.
slouken@0
   825
*/
megastep@7
   826
int Mix_PlayChannelTimed(int which, Mix_Chunk *chunk, int loops, int ticks)
slouken@0
   827
{
slouken@0
   828
	int i;
slouken@0
   829
slouken@0
   830
	/* Don't play null pointers :-) */
slouken@0
   831
	if ( chunk == NULL ) {
slouken@178
   832
		Mix_SetError("Tried to play a NULL chunk");
slouken@0
   833
		return(-1);
slouken@0
   834
	}
slouken@245
   835
	if ( !checkchunkintegral(chunk)) {
slouken@245
   836
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   837
		return(-1);
slouken@245
   838
	}
slouken@0
   839
slouken@0
   840
	/* Lock the mixer while modifying the playing channels */
slouken@172
   841
	SDL_LockAudio();
slouken@0
   842
	{
slouken@0
   843
		/* If which is -1, play on the first free channel */
slouken@0
   844
		if ( which == -1 ) {
megastep@7
   845
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   846
				if ( mix_channel[i].playing <= 0 )
slouken@0
   847
					break;
slouken@0
   848
			}
megastep@7
   849
			if ( i == num_channels ) {
slouken@178
   850
				Mix_SetError("No free channels available");
slouken@0
   851
				which = -1;
slouken@0
   852
			} else {
slouken@0
   853
				which = i;
slouken@0
   854
			}
slouken@0
   855
		}
slouken@0
   856
slouken@0
   857
		/* Queue up the audio data for this channel */
slouken@492
   858
		if ( which >= 0 && which < num_channels ) {
slouken@158
   859
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   860
			if (Mix_Playing(which))
slouken@172
   861
				_Mix_channel_done_playing(which);
slouken@60
   862
			mix_channel[which].samples = chunk->abuf;
slouken@60
   863
			mix_channel[which].playing = chunk->alen;
slouken@60
   864
			mix_channel[which].looping = loops;
slouken@60
   865
			mix_channel[which].chunk = chunk;
slouken@60
   866
			mix_channel[which].paused = 0;
slouken@60
   867
			mix_channel[which].fading = MIX_NO_FADING;
slouken@60
   868
			mix_channel[which].start_time = sdl_ticks;
slouken@60
   869
			mix_channel[which].expire = (ticks>0) ? (sdl_ticks + ticks) : 0;
megastep@4
   870
		}
megastep@4
   871
	}
slouken@172
   872
	SDL_UnlockAudio();
megastep@4
   873
megastep@4
   874
	/* Return the channel on which the sound is being played */
megastep@4
   875
	return(which);
megastep@4
   876
}
megastep@4
   877
megastep@7
   878
/* Change the expiration delay for a channel */
megastep@7
   879
int Mix_ExpireChannel(int which, int ticks)
megastep@7
   880
{
megastep@7
   881
	int status = 0;
megastep@7
   882
megastep@7
   883
	if ( which == -1 ) {
megastep@7
   884
		int i;
megastep@7
   885
		for ( i=0; i < num_channels; ++ i ) {
megastep@7
   886
			status += Mix_ExpireChannel(i, ticks);
megastep@7
   887
		}
megastep@7
   888
	} else if ( which < num_channels ) {
slouken@172
   889
		SDL_LockAudio();
slouken@60
   890
		mix_channel[which].expire = (ticks>0) ? (SDL_GetTicks() + ticks) : 0;
slouken@172
   891
		SDL_UnlockAudio();
megastep@7
   892
		++ status;
megastep@7
   893
	}
megastep@7
   894
	return(status);
megastep@7
   895
}
megastep@7
   896
megastep@4
   897
/* Fade in a sound on a channel, over ms milliseconds */
megastep@7
   898
int Mix_FadeInChannelTimed(int which, Mix_Chunk *chunk, int loops, int ms, int ticks)
megastep@4
   899
{
megastep@4
   900
	int i;
megastep@4
   901
megastep@4
   902
	/* Don't play null pointers :-) */
megastep@4
   903
	if ( chunk == NULL ) {
megastep@4
   904
		return(-1);
megastep@4
   905
	}
slouken@245
   906
	if ( !checkchunkintegral(chunk)) {
slouken@245
   907
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   908
		return(-1);
slouken@245
   909
	}
megastep@4
   910
megastep@4
   911
	/* Lock the mixer while modifying the playing channels */
slouken@172
   912
	SDL_LockAudio();
megastep@4
   913
	{
megastep@4
   914
		/* If which is -1, play on the first free channel */
megastep@4
   915
		if ( which == -1 ) {
megastep@7
   916
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   917
				if ( mix_channel[i].playing <= 0 )
megastep@4
   918
					break;
megastep@4
   919
			}
megastep@7
   920
			if ( i == num_channels ) {
megastep@4
   921
				which = -1;
megastep@4
   922
			} else {
megastep@4
   923
				which = i;
megastep@4
   924
			}
megastep@4
   925
		}
megastep@4
   926
megastep@4
   927
		/* Queue up the audio data for this channel */
slouken@492
   928
		if ( which >= 0 && which < num_channels ) {
slouken@158
   929
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   930
			if (Mix_Playing(which))
slouken@172
   931
				_Mix_channel_done_playing(which);
slouken@60
   932
			mix_channel[which].samples = chunk->abuf;
slouken@60
   933
			mix_channel[which].playing = chunk->alen;
slouken@60
   934
			mix_channel[which].looping = loops;
slouken@60
   935
			mix_channel[which].chunk = chunk;
slouken@60
   936
			mix_channel[which].paused = 0;
slouken@60
   937
			mix_channel[which].fading = MIX_FADING_IN;
slouken@60
   938
			mix_channel[which].fade_volume = mix_channel[which].volume;
icculus@444
   939
			mix_channel[which].fade_volume_reset = mix_channel[which].volume;
slouken@60
   940
			mix_channel[which].volume = 0;
slouken@60
   941
			mix_channel[which].fade_length = (Uint32)ms;
slouken@60
   942
			mix_channel[which].start_time = mix_channel[which].ticks_fade = sdl_ticks;
slouken@60
   943
			mix_channel[which].expire = (ticks > 0) ? (sdl_ticks+ticks) : 0;
slouken@0
   944
		}
slouken@0
   945
	}
slouken@172
   946
	SDL_UnlockAudio();
slouken@0
   947
slouken@0
   948
	/* Return the channel on which the sound is being played */
slouken@0
   949
	return(which);
slouken@0
   950
}
slouken@0
   951
slouken@0
   952
/* Set volume of a particular channel */
slouken@0
   953
int Mix_Volume(int which, int volume)
slouken@0
   954
{
slouken@0
   955
	int i;
slouken@492
   956
	int prev_volume = 0;
slouken@0
   957
slouken@0
   958
	if ( which == -1 ) {
megastep@7
   959
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   960
			prev_volume += Mix_Volume(i, volume);
slouken@0
   961
		}
megastep@7
   962
		prev_volume /= num_channels;
slouken@492
   963
	} else if ( which < num_channels ) {
slouken@60
   964
		prev_volume = mix_channel[which].volume;
slouken@163
   965
		if ( volume >= 0 ) {
slouken@163
   966
			if ( volume > SDL_MIX_MAXVOLUME ) {
slouken@163
   967
				volume = SDL_MIX_MAXVOLUME;
slouken@163
   968
			}
slouken@163
   969
			mix_channel[which].volume = volume;
slouken@0
   970
		}
slouken@0
   971
	}
slouken@0
   972
	return(prev_volume);
slouken@0
   973
}
slouken@0
   974
/* Set volume of a particular chunk */
slouken@0
   975
int Mix_VolumeChunk(Mix_Chunk *chunk, int volume)
slouken@0
   976
{
slouken@0
   977
	int prev_volume;
slouken@0
   978
slouken@0
   979
	prev_volume = chunk->volume;
slouken@0
   980
	if ( volume >= 0 ) {
slouken@0
   981
		if ( volume > MIX_MAX_VOLUME ) {
slouken@0
   982
			volume = MIX_MAX_VOLUME;
slouken@0
   983
		}
slouken@0
   984
		chunk->volume = volume;
slouken@0
   985
	}
slouken@0
   986
	return(prev_volume);
slouken@0
   987
}
slouken@0
   988
slouken@0
   989
/* Halt playing of a particular channel */
slouken@0
   990
int Mix_HaltChannel(int which)
slouken@0
   991
{
slouken@0
   992
	int i;
slouken@0
   993
slouken@0
   994
	if ( which == -1 ) {
megastep@7
   995
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   996
			Mix_HaltChannel(i);
slouken@0
   997
		}
slouken@492
   998
	} else if ( which < num_channels ) {
slouken@172
   999
		SDL_LockAudio();
slouken@113
  1000
		if (mix_channel[which].playing) {
slouken@172
  1001
			_Mix_channel_done_playing(which);
icculus@539
  1002
			mix_channel[which].playing = 0;
icculus@539
  1003
			mix_channel[which].looping = 0;
slouken@113
  1004
		}
slouken@60
  1005
		mix_channel[which].expire = 0;
slouken@60
  1006
		if(mix_channel[which].fading != MIX_NO_FADING) /* Restore volume */
icculus@443
  1007
			mix_channel[which].volume = mix_channel[which].fade_volume_reset;
slouken@60
  1008
		mix_channel[which].fading = MIX_NO_FADING;
slouken@172
  1009
		SDL_UnlockAudio();
slouken@0
  1010
	}
slouken@0
  1011
	return(0);
slouken@0
  1012
}
slouken@0
  1013
megastep@7
  1014
/* Halt playing of a particular group of channels */
megastep@7
  1015
int Mix_HaltGroup(int tag)
megastep@7
  1016
{
megastep@7
  1017
	int i;
megastep@7
  1018
megastep@7
  1019
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1020
		if( mix_channel[i].tag == tag ) {
megastep@7
  1021
			Mix_HaltChannel(i);
megastep@7
  1022
		}
megastep@7
  1023
	}
megastep@7
  1024
	return(0);
megastep@7
  1025
}
megastep@7
  1026
megastep@4
  1027
/* Fade out a channel and then stop it automatically */
megastep@4
  1028
int Mix_FadeOutChannel(int which, int ms)
megastep@4
  1029
{
megastep@4
  1030
	int status;
megastep@4
  1031
megastep@4
  1032
	status = 0;
slouken@89
  1033
	if ( audio_opened ) {
slouken@89
  1034
		if ( which == -1 ) {
slouken@89
  1035
			int i;
megastep@4
  1036
slouken@89
  1037
			for ( i=0; i<num_channels; ++i ) {
slouken@89
  1038
				status += Mix_FadeOutChannel(i, ms);
slouken@89
  1039
			}
slouken@492
  1040
		} else if ( which < num_channels ) {
slouken@172
  1041
			SDL_LockAudio();
slouken@89
  1042
			if ( mix_channel[which].playing && 
slouken@89
  1043
			    (mix_channel[which].volume > 0) &&
slouken@89
  1044
			    (mix_channel[which].fading != MIX_FADING_OUT) ) {
icculus@443
  1045
				mix_channel[which].fade_volume = mix_channel[which].volume;
slouken@89
  1046
				mix_channel[which].fading = MIX_FADING_OUT;
slouken@89
  1047
				mix_channel[which].fade_length = ms;
slouken@89
  1048
				mix_channel[which].ticks_fade = SDL_GetTicks();
icculus@443
  1049
icculus@443
  1050
				/* only change fade_volume_reset if we're not fading. */
icculus@443
  1051
				if (mix_channel[which].fading == MIX_NO_FADING) {
icculus@443
  1052
				    mix_channel[which].fade_volume_reset = mix_channel[which].volume;
icculus@443
  1053
				}
slouken@89
  1054
				++status;
slouken@89
  1055
			}
slouken@172
  1056
			SDL_UnlockAudio();
megastep@4
  1057
		}
megastep@4
  1058
	}
megastep@4
  1059
	return(status);
megastep@4
  1060
}
megastep@4
  1061
megastep@7
  1062
/* Halt playing of a particular group of channels */
megastep@7
  1063
int Mix_FadeOutGroup(int tag, int ms)
megastep@7
  1064
{
megastep@7
  1065
	int i;
megastep@7
  1066
	int status = 0;
megastep@7
  1067
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1068
		if( mix_channel[i].tag == tag ) {
megastep@7
  1069
			status += Mix_FadeOutChannel(i,ms);
megastep@7
  1070
		}
megastep@7
  1071
	}
megastep@7
  1072
	return(status);
megastep@7
  1073
}
megastep@7
  1074
megastep@4
  1075
Mix_Fading Mix_FadingChannel(int which)
megastep@4
  1076
{
slouken@492
  1077
	if ( which < 0 || which >= num_channels ) {
slouken@492
  1078
		return MIX_NO_FADING;
slouken@492
  1079
	}
slouken@60
  1080
	return mix_channel[which].fading;
megastep@4
  1081
}
megastep@4
  1082
slouken@0
  1083
/* Check the status of a specific channel.
slouken@113
  1084
   If the specified mix_channel is -1, check all mix channels.
slouken@0
  1085
*/
slouken@0
  1086
int Mix_Playing(int which)
slouken@0
  1087
{
slouken@0
  1088
	int status;
slouken@0
  1089
slouken@0
  1090
	status = 0;
slouken@0
  1091
	if ( which == -1 ) {
slouken@0
  1092
		int i;
slouken@0
  1093
megastep@7
  1094
		for ( i=0; i<num_channels; ++i ) {
slouken@113
  1095
			if ((mix_channel[i].playing > 0) ||
slouken@113
  1096
				(mix_channel[i].looping > 0))
slouken@113
  1097
			{
slouken@0
  1098
				++status;
slouken@0
  1099
			}
slouken@0
  1100
		}
slouken@492
  1101
	} else if ( which < num_channels ) {
slouken@492
  1102
		if ( (mix_channel[which].playing > 0) ||
slouken@492
  1103
		     (mix_channel[which].looping > 0) )
slouken@113
  1104
		{
slouken@0
  1105
			++status;
slouken@0
  1106
		}
slouken@0
  1107
	}
slouken@0
  1108
	return(status);
slouken@0
  1109
}
slouken@0
  1110
slouken@92
  1111
/* rcg06072001 Get the chunk associated with a channel. */
slouken@92
  1112
Mix_Chunk *Mix_GetChunk(int channel)
slouken@92
  1113
{
slouken@92
  1114
	Mix_Chunk *retval = NULL;
slouken@92
  1115
slouken@92
  1116
	if ((channel >= 0) && (channel < num_channels)) {
slouken@92
  1117
		retval = mix_channel[channel].chunk;
slouken@92
  1118
	}
slouken@92
  1119
slouken@92
  1120
	return(retval);
slouken@92
  1121
}
slouken@92
  1122
slouken@0
  1123
/* Close the mixer, halting all playing audio */
slouken@0
  1124
void Mix_CloseAudio(void)
slouken@0
  1125
{
slouken@113
  1126
	int i;
slouken@113
  1127
slouken@0
  1128
	if ( audio_opened ) {
slouken@0
  1129
		if ( audio_opened == 1 ) {
slouken@113
  1130
			for (i = 0; i < num_channels; i++) {
slouken@113
  1131
				Mix_UnregisterAllEffects(i);
slouken@113
  1132
			}
slouken@113
  1133
			Mix_UnregisterAllEffects(MIX_CHANNEL_POST);
slouken@0
  1134
			close_music();
slouken@0
  1135
			Mix_HaltChannel(-1);
icculus@360
  1136
			_Mix_DeinitEffects();
slouken@0
  1137
			SDL_CloseAudio();
slouken@60
  1138
			free(mix_channel);
slouken@60
  1139
			mix_channel = NULL;
icculus@390
  1140
icculus@390
  1141
			/* rcg06042009 report available decoders at runtime. */
icculus@390
  1142
			free(chunk_decoders);
icculus@390
  1143
			chunk_decoders = NULL;
icculus@390
  1144
			num_decoders = 0;
slouken@0
  1145
		}
slouken@0
  1146
		--audio_opened;
slouken@0
  1147
	}
slouken@0
  1148
}
slouken@0
  1149
slouken@0
  1150
/* Pause a particular channel (or all) */
slouken@0
  1151
void Mix_Pause(int which)
slouken@0
  1152
{
megastep@8
  1153
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@0
  1154
	if ( which == -1 ) {
slouken@0
  1155
		int i;
slouken@0
  1156
megastep@7
  1157
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1158
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1159
				mix_channel[i].paused = sdl_ticks;
slouken@0
  1160
			}
slouken@0
  1161
		}
slouken@492
  1162
	} else if ( which < num_channels ) {
slouken@60
  1163
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1164
			mix_channel[which].paused = sdl_ticks;
slouken@0
  1165
		}
slouken@0
  1166
	}
slouken@0
  1167
}
slouken@0
  1168
slouken@0
  1169
/* Resume a paused channel */
slouken@0
  1170
void Mix_Resume(int which)
slouken@0
  1171
{
megastep@8
  1172
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@172
  1173
slouken@172
  1174
	SDL_LockAudio();
slouken@0
  1175
	if ( which == -1 ) {
slouken@0
  1176
		int i;
slouken@0
  1177
megastep@7
  1178
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1179
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1180
				if(mix_channel[i].expire > 0)
slouken@60
  1181
					mix_channel[i].expire += sdl_ticks - mix_channel[i].paused;
slouken@60
  1182
				mix_channel[i].paused = 0;
slouken@0
  1183
			}
slouken@0
  1184
		}
slouken@492
  1185
	} else if ( which < num_channels ) {
slouken@60
  1186
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1187
			if(mix_channel[which].expire > 0)
slouken@60
  1188
				mix_channel[which].expire += sdl_ticks - mix_channel[which].paused;
slouken@60
  1189
			mix_channel[which].paused = 0;
slouken@0
  1190
		}
slouken@0
  1191
	}
slouken@172
  1192
	SDL_UnlockAudio();
slouken@0
  1193
}
megastep@7
  1194
megastep@13
  1195
int Mix_Paused(int which)
megastep@13
  1196
{
megastep@14
  1197
	if ( which < 0 ) {
megastep@14
  1198
		int status = 0;
megastep@14
  1199
		int i;
megastep@14
  1200
		for( i=0; i < num_channels; ++i ) {
slouken@60
  1201
			if ( mix_channel[i].paused ) {
megastep@14
  1202
				++ status;
megastep@14
  1203
			}
megastep@14
  1204
		}
megastep@14
  1205
		return(status);
slouken@492
  1206
	} else if ( which < num_channels ) {
slouken@492
  1207
		return(mix_channel[which].paused != 0);
megastep@14
  1208
	} else {
slouken@492
  1209
		return(0);
megastep@14
  1210
	}
megastep@13
  1211
}
megastep@13
  1212
megastep@7
  1213
/* Change the group of a channel */
megastep@7
  1214
int Mix_GroupChannel(int which, int tag)
megastep@7
  1215
{
megastep@7
  1216
	if ( which < 0 || which > num_channels )
megastep@7
  1217
		return(0);
megastep@7
  1218
slouken@172
  1219
	SDL_LockAudio();
slouken@60
  1220
	mix_channel[which].tag = tag;
slouken@172
  1221
	SDL_UnlockAudio();
megastep@7
  1222
	return(1);
megastep@7
  1223
}
megastep@7
  1224
megastep@7
  1225
/* Assign several consecutive channels to a group */
megastep@7
  1226
int Mix_GroupChannels(int from, int to, int tag)
megastep@7
  1227
{
megastep@7
  1228
	int status = 0;
megastep@7
  1229
	for( ; from <= to; ++ from ) {
megastep@7
  1230
		status += Mix_GroupChannel(from, tag);
megastep@7
  1231
	}
megastep@7
  1232
	return(status);
megastep@7
  1233
}
megastep@7
  1234
megastep@7
  1235
/* Finds the first available channel in a group of channels */
megastep@7
  1236
int Mix_GroupAvailable(int tag)
megastep@7
  1237
{
megastep@7
  1238
	int i;
megastep@7
  1239
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1240
		if ( ((tag == -1) || (tag == mix_channel[i].tag)) &&
slouken@60
  1241
		                    (mix_channel[i].playing <= 0) )
megastep@7
  1242
			return i;
megastep@7
  1243
	}
megastep@7
  1244
	return(-1);
megastep@7
  1245
}
megastep@7
  1246
megastep@7
  1247
int Mix_GroupCount(int tag)
megastep@7
  1248
{
megastep@7
  1249
	int count = 0;
megastep@7
  1250
	int i;
megastep@7
  1251
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1252
		if ( mix_channel[i].tag==tag || tag==-1 )
megastep@7
  1253
			++ count;
megastep@7
  1254
	}
megastep@7
  1255
	return(count);
megastep@7
  1256
}
megastep@8
  1257
megastep@8
  1258
/* Finds the "oldest" sample playing in a group of channels */
megastep@8
  1259
int Mix_GroupOldest(int tag)
megastep@8
  1260
{
megastep@8
  1261
	int chan = -1;
megastep@8
  1262
	Uint32 mintime = SDL_GetTicks();
megastep@8
  1263
	int i;
megastep@8
  1264
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1265
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1266
			 && mix_channel[i].start_time <= mintime ) {
slouken@60
  1267
			mintime = mix_channel[i].start_time;
megastep@8
  1268
			chan = i;
megastep@8
  1269
		}
megastep@8
  1270
	}
megastep@8
  1271
	return(chan);
megastep@8
  1272
}
megastep@8
  1273
megastep@8
  1274
/* Finds the "most recent" (i.e. last) sample playing in a group of channels */
megastep@8
  1275
int Mix_GroupNewer(int tag)
megastep@8
  1276
{
megastep@8
  1277
	int chan = -1;
megastep@8
  1278
	Uint32 maxtime = 0;
megastep@8
  1279
	int i;
megastep@8
  1280
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1281
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1282
			 && mix_channel[i].start_time >= maxtime ) {
slouken@60
  1283
			maxtime = mix_channel[i].start_time;
megastep@8
  1284
			chan = i;
megastep@8
  1285
		}
megastep@8
  1286
	}
megastep@8
  1287
	return(chan);
megastep@8
  1288
}
slouken@113
  1289
slouken@113
  1290
slouken@113
  1291
slouken@113
  1292
/*
slouken@113
  1293
 * rcg06122001 The special effects exportable API.
slouken@113
  1294
 *  Please see effect_*.c for internally-implemented effects, such
slouken@113
  1295
 *  as Mix_SetPanning().
slouken@113
  1296
 */
slouken@113
  1297
slouken@164
  1298
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1299
static int _Mix_register_effect(effect_info **e, Mix_EffectFunc_t f,
slouken@164
  1300
				Mix_EffectDone_t d, void *arg)
slouken@113
  1301
{
icculus@512
  1302
	effect_info *new_e;
slouken@113
  1303
slouken@113
  1304
	if (!e) {
slouken@113
  1305
		Mix_SetError("Internal error");
slouken@113
  1306
		return(0);
slouken@113
  1307
	}
slouken@113
  1308
slouken@113
  1309
	if (f == NULL) {
slouken@113
  1310
		Mix_SetError("NULL effect callback");
slouken@113
  1311
		return(0);
slouken@113
  1312
	}
slouken@113
  1313
icculus@512
  1314
	new_e = malloc(sizeof (effect_info));
slouken@113
  1315
	if (new_e == NULL) {
slouken@113
  1316
		Mix_SetError("Out of memory");
slouken@113
  1317
		return(0);
slouken@113
  1318
	}
slouken@113
  1319
slouken@113
  1320
	new_e->callback = f;
slouken@113
  1321
	new_e->done_callback = d;
slouken@113
  1322
	new_e->udata = arg;
slouken@113
  1323
	new_e->next = NULL;
slouken@113
  1324
slouken@113
  1325
	/* add new effect to end of linked list... */
slouken@113
  1326
	if (*e == NULL) {
slouken@113
  1327
		*e = new_e;
slouken@113
  1328
	} else {
slouken@113
  1329
		effect_info *cur = *e;
slouken@113
  1330
		while (1) {
slouken@113
  1331
			if (cur->next == NULL) {
slouken@113
  1332
				cur->next = new_e;
slouken@113
  1333
				break;
slouken@113
  1334
			}
slouken@113
  1335
			cur = cur->next;
slouken@113
  1336
		}
slouken@113
  1337
	}
slouken@113
  1338
slouken@113
  1339
	return(1);
slouken@113
  1340
}
slouken@113
  1341
slouken@113
  1342
slouken@164
  1343
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1344
static int _Mix_remove_effect(int channel, effect_info **e, Mix_EffectFunc_t f)
slouken@113
  1345
{
slouken@113
  1346
	effect_info *cur;
slouken@113
  1347
	effect_info *prev = NULL;
slouken@113
  1348
	effect_info *next = NULL;
slouken@113
  1349
slouken@113
  1350
	if (!e) {
slouken@113
  1351
		Mix_SetError("Internal error");
slouken@113
  1352
		return(0);
slouken@113
  1353
	}
slouken@113
  1354
slouken@113
  1355
	for (cur = *e; cur != NULL; cur = cur->next) {
slouken@113
  1356
		if (cur->callback == f) {
slouken@113
  1357
			next = cur->next;
slouken@113
  1358
			if (cur->done_callback != NULL) {
slouken@113
  1359
				cur->done_callback(channel, cur->udata);
slouken@113
  1360
			}
slouken@113
  1361
			free(cur);
slouken@113
  1362
slouken@113
  1363
			if (prev == NULL) {   /* removing first item of list? */
slouken@113
  1364
				*e = next;
slouken@113
  1365
			} else {
slouken@113
  1366
				prev->next = next;
slouken@113
  1367
			}
slouken@113
  1368
			return(1);
slouken@113
  1369
		}
slouken@113
  1370
		prev = cur;
slouken@113
  1371
	}
slouken@113
  1372
slouken@113
  1373
	Mix_SetError("No such effect registered");
slouken@113
  1374
	return(0);
slouken@113
  1375
}
slouken@113
  1376
slouken@113
  1377
slouken@164
  1378
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1379
static int _Mix_remove_all_effects(int channel, effect_info **e)
slouken@113
  1380
{
slouken@113
  1381
	effect_info *cur;
slouken@113
  1382
	effect_info *next;
slouken@113
  1383
slouken@113
  1384
	if (!e) {
slouken@113
  1385
		Mix_SetError("Internal error");
slouken@113
  1386
		return(0);
slouken@113
  1387
	}
slouken@113
  1388
slouken@113
  1389
	for (cur = *e; cur != NULL; cur = next) {
slouken@113
  1390
		next = cur->next;
slouken@113
  1391
		if (cur->done_callback != NULL) {
slouken@113
  1392
			cur->done_callback(channel, cur->udata);
slouken@113
  1393
		}
slouken@113
  1394
		free(cur);
slouken@113
  1395
	}
slouken@113
  1396
	*e = NULL;
slouken@113
  1397
slouken@113
  1398
	return(1);
slouken@113
  1399
}
slouken@113
  1400
slouken@113
  1401
icculus@442
  1402
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1403
int _Mix_RegisterEffect_locked(int channel, Mix_EffectFunc_t f,
slouken@164
  1404
			Mix_EffectDone_t d, void *arg)
slouken@113
  1405
{
slouken@113
  1406
	effect_info **e = NULL;
slouken@113
  1407
slouken@113
  1408
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1409
		e = &posteffects;
slouken@113
  1410
	} else {
slouken@113
  1411
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1412
			Mix_SetError("Invalid channel number");
slouken@113
  1413
			return(0);
slouken@113
  1414
		}
slouken@113
  1415
		e = &mix_channel[channel].effects;
slouken@113
  1416
	}
slouken@113
  1417
icculus@442
  1418
	return _Mix_register_effect(e, f, d, arg);
slouken@113
  1419
}
slouken@113
  1420
icculus@442
  1421
int Mix_RegisterEffect(int channel, Mix_EffectFunc_t f,
icculus@442
  1422
			Mix_EffectDone_t d, void *arg)
icculus@442
  1423
{
icculus@442
  1424
    int retval;
icculus@442
  1425
	SDL_LockAudio();
icculus@442
  1426
	retval = _Mix_RegisterEffect_locked(channel, f, d, arg);
icculus@442
  1427
	SDL_UnlockAudio();
icculus@442
  1428
    return retval;
icculus@442
  1429
}
slouken@113
  1430
icculus@442
  1431
icculus@442
  1432
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1433
int _Mix_UnregisterEffect_locked(int channel, Mix_EffectFunc_t f)
slouken@113
  1434
{
slouken@113
  1435
	effect_info **e = NULL;
slouken@113
  1436
slouken@113
  1437
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1438
		e = &posteffects;
slouken@113
  1439
	} else {
slouken@113
  1440
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1441
			Mix_SetError("Invalid channel number");
slouken@113
  1442
			return(0);
slouken@113
  1443
		}
slouken@113
  1444
		e = &mix_channel[channel].effects;
slouken@113
  1445
	}
slouken@113
  1446
icculus@442
  1447
	return _Mix_remove_effect(channel, e, f);
icculus@442
  1448
}
icculus@442
  1449
icculus@442
  1450
int Mix_UnregisterEffect(int channel, Mix_EffectFunc_t f)
icculus@442
  1451
{
icculus@442
  1452
	int retval;
slouken@164
  1453
	SDL_LockAudio();
icculus@442
  1454
	retval = _Mix_UnregisterEffect_locked(channel, f);
slouken@164
  1455
	SDL_UnlockAudio();
slouken@164
  1456
	return(retval);
slouken@164
  1457
}
slouken@164
  1458
icculus@442
  1459
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1460
int _Mix_UnregisterAllEffects_locked(int channel)
slouken@164
  1461
{
slouken@164
  1462
	effect_info **e = NULL;
slouken@164
  1463
slouken@164
  1464
	if (channel == MIX_CHANNEL_POST) {
slouken@164
  1465
		e = &posteffects;
slouken@164
  1466
	} else {
slouken@164
  1467
		if ((channel < 0) || (channel >= num_channels)) {
slouken@164
  1468
			Mix_SetError("Invalid channel number");
slouken@164
  1469
			return(0);
slouken@164
  1470
		}
slouken@164
  1471
		e = &mix_channel[channel].effects;
slouken@164
  1472
	}
slouken@164
  1473
icculus@442
  1474
	return _Mix_remove_all_effects(channel, e);
icculus@442
  1475
}
icculus@442
  1476
icculus@442
  1477
int Mix_UnregisterAllEffects(int channel)
icculus@442
  1478
{
icculus@442
  1479
	int retval;
slouken@164
  1480
	SDL_LockAudio();
icculus@442
  1481
	retval = _Mix_UnregisterAllEffects_locked(channel);
slouken@164
  1482
	SDL_UnlockAudio();
slouken@164
  1483
	return(retval);
slouken@113
  1484
}
slouken@113
  1485
slouken@113
  1486
/* end of mixer.c ... */
slouken@113
  1487