mixer.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 28 Jan 2012 10:43:16 -0500
changeset 576 9026009cf370
parent 562 4129f7c1c68f
child 583 2d713670db9b
permissions -rw-r--r--
Updated to version 1.2.13
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/*
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  SDL_mixer:  An audio mixer library based on the SDL library
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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/* $Id$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL_mutex.h"
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#include "SDL_endian.h"
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#include "SDL_timer.h"
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#include "SDL_mixer.h"
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#include "load_aiff.h"
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#include "load_voc.h"
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#include "load_ogg.h"
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#include "load_flac.h"
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#include "dynamic_flac.h"
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#include "dynamic_mod.h"
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#include "dynamic_mp3.h"
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#include "dynamic_ogg.h"
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#define __MIX_INTERNAL_EFFECT__
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#include "effects_internal.h"
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/* Magic numbers for various audio file formats */
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#define RIFF		0x46464952		/* "RIFF" */
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#define WAVE		0x45564157		/* "WAVE" */
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#define FORM		0x4d524f46		/* "FORM" */
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#define OGGS		0x5367674f		/* "OggS" */
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#define CREA		0x61657243		/* "Crea" */
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#define FLAC		0x43614C66		/* "fLaC" */
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static int audio_opened = 0;
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static SDL_AudioSpec mixer;
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typedef struct _Mix_effectinfo
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{
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	Mix_EffectFunc_t callback;
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	Mix_EffectDone_t done_callback;
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	void *udata;
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	struct _Mix_effectinfo *next;
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} effect_info;
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static struct _Mix_Channel {
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	Mix_Chunk *chunk;
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	int playing;
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	int paused;
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	Uint8 *samples;
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	int volume;
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	int looping;
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	int tag;
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	Uint32 expire;
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	Uint32 start_time;
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	Mix_Fading fading;
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	int fade_volume;
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	int fade_volume_reset;
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	Uint32 fade_length;
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	Uint32 ticks_fade;
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	effect_info *effects;
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} *mix_channel = NULL;
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static effect_info *posteffects = NULL;
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static int num_channels;
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static int reserved_channels = 0;
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/* Support for hooking into the mixer callback system */
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static void (*mix_postmix)(void *udata, Uint8 *stream, int len) = NULL;
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static void *mix_postmix_data = NULL;
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/* rcg07062001 callback to alert when channels are done playing. */
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static void (*channel_done_callback)(int channel) = NULL;
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/* Music function declarations */
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extern int open_music(SDL_AudioSpec *mixer);
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extern void close_music(void);
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/* Support for user defined music functions, plus the default one */
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extern int volatile music_active;
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extern void music_mixer(void *udata, Uint8 *stream, int len);
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static void (*mix_music)(void *udata, Uint8 *stream, int len) = music_mixer;
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static void *music_data = NULL;
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/* rcg06042009 report available decoders at runtime. */
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static const char **chunk_decoders = NULL;
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static int num_decoders = 0;
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/* Semicolon-separated SoundFont paths */
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#ifdef MID_MUSIC
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extern char* soundfont_paths;
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#endif
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int Mix_GetNumChunkDecoders(void)
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{
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	return(num_decoders);
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}
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const char *Mix_GetChunkDecoder(int index)
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{
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	if ((index < 0) || (index >= num_decoders)) {
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		return NULL;
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	}
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	return(chunk_decoders[index]);
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}
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static void add_chunk_decoder(const char *decoder)
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{
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	void *ptr = SDL_realloc(chunk_decoders, (num_decoders + 1) * sizeof (const char **));
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	if (ptr == NULL) {
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		return;  /* oh well, go on without it. */
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	}
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	chunk_decoders = (const char **) ptr;
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	chunk_decoders[num_decoders++] = decoder;
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}
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/* rcg06192001 get linked library's version. */
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const SDL_version *Mix_Linked_Version(void)
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{
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	static SDL_version linked_version;
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	SDL_MIXER_VERSION(&linked_version);
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	return(&linked_version);
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}
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static int initialized = 0;
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int Mix_Init(int flags)
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{
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	int result = 0;
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	if (flags & MIX_INIT_FLUIDSYNTH) {
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#ifdef USE_FLUIDSYNTH_MIDI
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		if ((initialized & MIX_INIT_FLUIDSYNTH) || Mix_InitFluidSynth() == 0) {
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			result |= MIX_INIT_FLUIDSYNTH;
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		}
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#else
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		Mix_SetError("Mixer not built with FluidSynth support");
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#endif
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	}
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	if (flags & MIX_INIT_FLAC) {
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#ifdef FLAC_MUSIC
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		if ((initialized & MIX_INIT_FLAC) || Mix_InitFLAC() == 0) {
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			result |= MIX_INIT_FLAC;
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		}
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#else
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		Mix_SetError("Mixer not built with FLAC support");
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#endif
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	}
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	if (flags & MIX_INIT_MOD) {
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#ifdef MOD_MUSIC
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		if ((initialized & MIX_INIT_MOD) || Mix_InitMOD() == 0) {
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			result |= MIX_INIT_MOD;
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		}
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#else
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		Mix_SetError("Mixer not built with MOD support");
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#endif
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	}
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	if (flags & MIX_INIT_MP3) {
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#ifdef MP3_MUSIC
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		if ((initialized & MIX_INIT_MP3) || Mix_InitMP3() == 0) {
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			result |= MIX_INIT_MP3;
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		}
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#else
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		Mix_SetError("Mixer not built with MP3 support");
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#endif
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	}
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	if (flags & MIX_INIT_OGG) {
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#ifdef OGG_MUSIC
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		if ((initialized & MIX_INIT_OGG) || Mix_InitOgg() == 0) {
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			result |= MIX_INIT_OGG;
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		}
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#else
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		Mix_SetError("Mixer not built with Ogg Vorbis support");
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#endif
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	}
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	initialized |= result;
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	return (result);
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}
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void Mix_Quit()
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{
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#ifdef USE_FLUIDSYNTH_MIDI
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	if (initialized & MIX_INIT_FLUIDSYNTH) {
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		Mix_QuitFluidSynth();
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	}
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#endif
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#ifdef FLAC_MUSIC
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	if (initialized & MIX_INIT_FLAC) {
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		Mix_QuitFLAC();
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	}
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#endif
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#ifdef MOD_MUSIC
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	if (initialized & MIX_INIT_MOD) {
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		Mix_QuitMOD();
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	}
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#endif
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#ifdef MP3_MUSIC
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	if (initialized & MIX_INIT_MP3) {
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		Mix_QuitMP3();
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	}
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#endif
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#ifdef OGG_MUSIC
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	if (initialized & MIX_INIT_OGG) {
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		Mix_QuitOgg();
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	}
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#endif
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#ifdef MID_MUSIC
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	if (soundfont_paths) {
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		SDL_free(soundfont_paths);
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	}
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#endif
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	initialized = 0;
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}
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static int _Mix_remove_all_effects(int channel, effect_info **e);
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/*
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 * rcg06122001 Cleanup effect callbacks.
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 *  MAKE SURE SDL_LockAudio() is called before this (or you're in the
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 *   audio callback).
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 */
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static void _Mix_channel_done_playing(int channel)
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{
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	if (channel_done_callback) {
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	    channel_done_callback(channel);
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	}
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	/*
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	 * Call internal function directly, to avoid locking audio from
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	 *   inside audio callback.
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	 */
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	_Mix_remove_all_effects(channel, &mix_channel[channel].effects);
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}
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static void *Mix_DoEffects(int chan, void *snd, int len)
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{
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	int posteffect = (chan == MIX_CHANNEL_POST);
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	effect_info *e = ((posteffect) ? posteffects : mix_channel[chan].effects);
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	void *buf = snd;
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	if (e != NULL) {    /* are there any registered effects? */
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		/* if this is the postmix, we can just overwrite the original. */
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		if (!posteffect) {
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			buf = SDL_malloc(len);
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			if (buf == NULL) {
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				return(snd);
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			}
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			memcpy(buf, snd, len);
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		}
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		for (; e != NULL; e = e->next) {
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			if (e->callback != NULL) {
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				e->callback(chan, buf, len, e->udata);
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			}
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		}
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	}
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	/* be sure to SDL_free() the return value if != snd ... */
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	return(buf);
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}
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/* Mixing function */
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static void mix_channels(void *udata, Uint8 *stream, int len)
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{
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	Uint8 *mix_input;
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	int i, mixable, volume = SDL_MIX_MAXVOLUME;
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	Uint32 sdl_ticks;
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#if SDL_VERSION_ATLEAST(1, 3, 0)
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	/* Need to initialize the stream in SDL 1.3+ */
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	memset(stream, mixer.silence, len);
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#endif
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	/* Mix the music (must be done before the channels are added) */
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	if ( music_active || (mix_music != music_mixer) ) {
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		mix_music(music_data, stream, len);
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	}
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	/* Mix any playing channels... */
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	sdl_ticks = SDL_GetTicks();
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	for ( i=0; i<num_channels; ++i ) {
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		if( ! mix_channel[i].paused ) {
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			if ( mix_channel[i].expire > 0 && mix_channel[i].expire < sdl_ticks ) {
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				/* Expiration delay for that channel is reached */
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				mix_channel[i].playing = 0;
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				mix_channel[i].looping = 0;
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				mix_channel[i].fading = MIX_NO_FADING;
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				mix_channel[i].expire = 0;
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				_Mix_channel_done_playing(i);
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			} else if ( mix_channel[i].fading != MIX_NO_FADING ) {
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				Uint32 ticks = sdl_ticks - mix_channel[i].ticks_fade;
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				if( ticks > mix_channel[i].fade_length ) {
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				    Mix_Volume(i, mix_channel[i].fade_volume_reset); /* Restore the volume */
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					if( mix_channel[i].fading == MIX_FADING_OUT ) {
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						mix_channel[i].playing = 0;
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						mix_channel[i].looping = 0;
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						mix_channel[i].expire = 0;
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						_Mix_channel_done_playing(i);
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					}
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					mix_channel[i].fading = MIX_NO_FADING;
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				} else {
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					if( mix_channel[i].fading == MIX_FADING_OUT ) {
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						Mix_Volume(i, (mix_channel[i].fade_volume * (mix_channel[i].fade_length-ticks))
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								   / mix_channel[i].fade_length );
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					} else {
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						Mix_Volume(i, (mix_channel[i].fade_volume * ticks) / mix_channel[i].fade_length );
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					}
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				}
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			}
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			if ( mix_channel[i].playing > 0 ) {
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				int index = 0;
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				int remaining = len;
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				while (mix_channel[i].playing > 0 && index < len) {
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					remaining = len - index;
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					volume = (mix_channel[i].volume*mix_channel[i].chunk->volume) / MIX_MAX_VOLUME;
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					mixable = mix_channel[i].playing;
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					if ( mixable > remaining ) {
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						mixable = remaining;
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					}
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					mix_input = Mix_DoEffects(i, mix_channel[i].samples, mixable);
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					SDL_MixAudio(stream+index,mix_input,mixable,volume);
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					if (mix_input != mix_channel[i].samples)
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						SDL_free(mix_input);
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					mix_channel[i].samples += mixable;
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					mix_channel[i].playing -= mixable;
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					index += mixable;
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					/* rcg06072001 Alert app if channel is done playing. */
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					if (!mix_channel[i].playing && !mix_channel[i].looping) {
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						_Mix_channel_done_playing(i);
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					}
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				}
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				/* If looping the sample and we are at its end, make sure
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				   we will still return a full buffer */
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				while ( mix_channel[i].looping && index < len ) {
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					int alen = mix_channel[i].chunk->alen;
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					remaining = len - index;
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					if (remaining > alen) {
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						remaining = alen;
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					}
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					mix_input = Mix_DoEffects(i, mix_channel[i].chunk->abuf, remaining);
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					SDL_MixAudio(stream+index, mix_input, remaining, volume);
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					if (mix_input != mix_channel[i].chunk->abuf)
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						SDL_free(mix_input);
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					--mix_channel[i].looping;
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					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@561
   446
	mix_channel = (struct _Mix_Channel *) SDL_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@561
   500
	mix_channel = (struct _Mix_Channel *) SDL_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@561
   571
	chunk = (Mix_Chunk *)SDL_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@561
   616
		SDL_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@561
   635
			SDL_free(chunk->abuf);
slouken@561
   636
			SDL_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@561
   641
		wavecvt.buf = (Uint8 *)SDL_calloc(1, wavecvt.len*wavecvt.len_mult);
slouken@560
   642
		if ( wavecvt.buf == NULL ) {
slouken@560
   643
			SDL_SetError("Out of memory");
slouken@561
   644
			SDL_free(chunk->abuf);
slouken@561
   645
			SDL_free(chunk);
slouken@560
   646
			return(NULL);
slouken@560
   647
		}
slouken@560
   648
		memcpy(wavecvt.buf, chunk->abuf, chunk->alen);
slouken@561
   649
		SDL_free(chunk->abuf);
slouken@560
   650
slouken@560
   651
		/* Run the audio converter */
slouken@560
   652
		if ( SDL_ConvertAudio(&wavecvt) < 0 ) {
slouken@561
   653
			SDL_free(wavecvt.buf);
slouken@561
   654
			SDL_free(chunk);
slouken@560
   655
			return(NULL);
slouken@560
   656
		}
slouken@562
   657
slouken@562
   658
		chunk->abuf = wavecvt.buf;
slouken@562
   659
		chunk->alen = wavecvt.len_cvt;
slouken@0
   660
	}
slouken@0
   661
slouken@1
   662
	chunk->allocated = 1;
slouken@0
   663
	chunk->volume = MIX_MAX_VOLUME;
icculus@516
   664
slouken@0
   665
	return(chunk);
slouken@0
   666
}
slouken@0
   667
slouken@1
   668
/* Load a wave file of the mixer format from a memory buffer */
slouken@1
   669
Mix_Chunk *Mix_QuickLoad_WAV(Uint8 *mem)
slouken@1
   670
{
slouken@1
   671
	Mix_Chunk *chunk;
slouken@1
   672
	Uint8 magic[4];
slouken@1
   673
slouken@1
   674
	/* Make sure audio has been opened */
slouken@1
   675
	if ( ! audio_opened ) {
slouken@1
   676
		SDL_SetError("Audio device hasn't been opened");
slouken@1
   677
		return(NULL);
slouken@1
   678
	}
slouken@1
   679
slouken@1
   680
	/* Allocate the chunk memory */
slouken@561
   681
	chunk = (Mix_Chunk *)SDL_calloc(1,sizeof(Mix_Chunk));
slouken@1
   682
	if ( chunk == NULL ) {
slouken@1
   683
		SDL_SetError("Out of memory");
slouken@1
   684
		return(NULL);
slouken@1
   685
	}
slouken@1
   686
slouken@1
   687
	/* Essentially just skip to the audio data (no error checking - fast) */
slouken@1
   688
	chunk->allocated = 0;
slouken@1
   689
	mem += 12; /* WAV header */
slouken@1
   690
	do {
slouken@1
   691
		memcpy(magic, mem, 4);
slouken@1
   692
		mem += 4;
slouken@1
   693
		chunk->alen = ((mem[3]<<24)|(mem[2]<<16)|(mem[1]<<8)|(mem[0]));
slouken@1
   694
		mem += 4;
slouken@1
   695
		chunk->abuf = mem;
slouken@1
   696
		mem += chunk->alen;
slouken@1
   697
	} while ( memcmp(magic, "data", 4) != 0 );
slouken@1
   698
	chunk->volume = MIX_MAX_VOLUME;
slouken@1
   699
slouken@1
   700
	return(chunk);
slouken@1
   701
}
slouken@1
   702
slouken@174
   703
/* Load raw audio data of the mixer format from a memory buffer */
slouken@174
   704
Mix_Chunk *Mix_QuickLoad_RAW(Uint8 *mem, Uint32 len)
slouken@174
   705
{
slouken@174
   706
	Mix_Chunk *chunk;
slouken@174
   707
slouken@174
   708
	/* Make sure audio has been opened */
slouken@174
   709
	if ( ! audio_opened ) {
slouken@174
   710
		SDL_SetError("Audio device hasn't been opened");
slouken@174
   711
		return(NULL);
slouken@174
   712
	}
slouken@174
   713
slouken@174
   714
	/* Allocate the chunk memory */
slouken@561
   715
	chunk = (Mix_Chunk *)SDL_malloc(sizeof(Mix_Chunk));
slouken@174
   716
	if ( chunk == NULL ) {
slouken@174
   717
		SDL_SetError("Out of memory");
slouken@174
   718
		return(NULL);
slouken@174
   719
	}
slouken@174
   720
slouken@174
   721
	/* Essentially just point at the audio data (no error checking - fast) */
slouken@174
   722
	chunk->allocated = 0;
slouken@174
   723
	chunk->alen = len;
slouken@174
   724
	chunk->abuf = mem;
slouken@174
   725
	chunk->volume = MIX_MAX_VOLUME;
slouken@174
   726
slouken@174
   727
	return(chunk);
slouken@174
   728
}
slouken@174
   729
slouken@0
   730
/* Free an audio chunk previously loaded */
slouken@0
   731
void Mix_FreeChunk(Mix_Chunk *chunk)
slouken@0
   732
{
slouken@0
   733
	int i;
slouken@0
   734
slouken@0
   735
	/* Caution -- if the chunk is playing, the mixer will crash */
slouken@0
   736
	if ( chunk ) {
slouken@0
   737
		/* Guarantee that this chunk isn't playing */
slouken@172
   738
		SDL_LockAudio();
slouken@60
   739
		if ( mix_channel ) {
slouken@60
   740
			for ( i=0; i<num_channels; ++i ) {
slouken@60
   741
				if ( chunk == mix_channel[i].chunk ) {
slouken@60
   742
					mix_channel[i].playing = 0;
icculus@539
   743
					mix_channel[i].looping = 0;
slouken@60
   744
				}
slouken@0
   745
			}
slouken@0
   746
		}
slouken@172
   747
		SDL_UnlockAudio();
slouken@0
   748
		/* Actually free the chunk */
slouken@1
   749
		if ( chunk->allocated ) {
slouken@561
   750
			SDL_free(chunk->abuf);
slouken@1
   751
		}
slouken@561
   752
		SDL_free(chunk);
slouken@0
   753
	}
slouken@0
   754
}
slouken@0
   755
slouken@26
   756
/* Set a function that is called after all mixing is performed.
slouken@26
   757
   This can be used to provide real-time visual display of the audio stream
slouken@26
   758
   or add a custom mixer filter for the stream data.
slouken@26
   759
*/
slouken@26
   760
void Mix_SetPostMix(void (*mix_func)
slouken@26
   761
                    (void *udata, Uint8 *stream, int len), void *arg)
slouken@26
   762
{
slouken@26
   763
	SDL_LockAudio();
slouken@26
   764
	mix_postmix_data = arg;
slouken@26
   765
	mix_postmix = mix_func;
slouken@26
   766
	SDL_UnlockAudio();
slouken@26
   767
}
slouken@26
   768
slouken@0
   769
/* Add your own music player or mixer function.
slouken@0
   770
   If 'mix_func' is NULL, the default music player is re-enabled.
slouken@0
   771
 */
slouken@0
   772
void Mix_HookMusic(void (*mix_func)(void *udata, Uint8 *stream, int len),
slouken@0
   773
                                                                void *arg)
slouken@0
   774
{
slouken@0
   775
	SDL_LockAudio();
slouken@0
   776
	if ( mix_func != NULL ) {
slouken@0
   777
		music_data = arg;
slouken@0
   778
		mix_music = mix_func;
slouken@0
   779
	} else {
slouken@0
   780
		music_data = NULL;
slouken@0
   781
		mix_music = music_mixer;
slouken@0
   782
	}
slouken@0
   783
	SDL_UnlockAudio();
slouken@0
   784
}
slouken@0
   785
slouken@0
   786
void *Mix_GetMusicHookData(void)
slouken@0
   787
{
slouken@0
   788
	return(music_data);
slouken@0
   789
}
slouken@0
   790
slouken@92
   791
void Mix_ChannelFinished(void (*channel_finished)(int channel))
slouken@92
   792
{
slouken@172
   793
	SDL_LockAudio();
slouken@172
   794
	channel_done_callback = channel_finished;
slouken@172
   795
	SDL_UnlockAudio();
slouken@92
   796
}
slouken@92
   797
slouken@92
   798
slouken@0
   799
/* Reserve the first channels (0 -> n-1) for the application, i.e. don't allocate
slouken@0
   800
   them dynamically to the next sample if requested with a -1 value below.
slouken@0
   801
   Returns the number of reserved channels.
slouken@0
   802
 */
slouken@0
   803
int Mix_ReserveChannels(int num)
slouken@0
   804
{
megastep@7
   805
	if (num > num_channels)
megastep@7
   806
		num = num_channels;
slouken@0
   807
	reserved_channels = num;
slouken@0
   808
	return num;
slouken@0
   809
}
slouken@0
   810
slouken@245
   811
static int checkchunkintegral(Mix_Chunk *chunk)
slouken@245
   812
{
slouken@245
   813
	int frame_width = 1;
slouken@245
   814
slouken@245
   815
	if ((mixer.format & 0xFF) == 16) frame_width = 2;
slouken@245
   816
	frame_width *= mixer.channels;
slouken@245
   817
	while (chunk->alen % frame_width) chunk->alen--;
slouken@245
   818
	return chunk->alen;
slouken@245
   819
}
slouken@245
   820
slouken@0
   821
/* Play an audio chunk on a specific channel.
slouken@0
   822
   If the specified channel is -1, play on the first free channel.
megastep@7
   823
   'ticks' is the number of milliseconds at most to play the sample, or -1
megastep@7
   824
   if there is no limit.
slouken@0
   825
   Returns which channel was used to play the sound.
slouken@0
   826
*/
megastep@7
   827
int Mix_PlayChannelTimed(int which, Mix_Chunk *chunk, int loops, int ticks)
slouken@0
   828
{
slouken@0
   829
	int i;
slouken@0
   830
slouken@0
   831
	/* Don't play null pointers :-) */
slouken@0
   832
	if ( chunk == NULL ) {
slouken@178
   833
		Mix_SetError("Tried to play a NULL chunk");
slouken@0
   834
		return(-1);
slouken@0
   835
	}
slouken@245
   836
	if ( !checkchunkintegral(chunk)) {
slouken@245
   837
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   838
		return(-1);
slouken@245
   839
	}
slouken@0
   840
slouken@0
   841
	/* Lock the mixer while modifying the playing channels */
slouken@172
   842
	SDL_LockAudio();
slouken@0
   843
	{
slouken@0
   844
		/* If which is -1, play on the first free channel */
slouken@0
   845
		if ( which == -1 ) {
megastep@7
   846
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   847
				if ( mix_channel[i].playing <= 0 )
slouken@0
   848
					break;
slouken@0
   849
			}
megastep@7
   850
			if ( i == num_channels ) {
slouken@178
   851
				Mix_SetError("No free channels available");
slouken@0
   852
				which = -1;
slouken@0
   853
			} else {
slouken@0
   854
				which = i;
slouken@0
   855
			}
slouken@0
   856
		}
slouken@0
   857
slouken@0
   858
		/* Queue up the audio data for this channel */
slouken@492
   859
		if ( which >= 0 && which < num_channels ) {
slouken@158
   860
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   861
			if (Mix_Playing(which))
slouken@172
   862
				_Mix_channel_done_playing(which);
slouken@60
   863
			mix_channel[which].samples = chunk->abuf;
slouken@60
   864
			mix_channel[which].playing = chunk->alen;
slouken@60
   865
			mix_channel[which].looping = loops;
slouken@60
   866
			mix_channel[which].chunk = chunk;
slouken@60
   867
			mix_channel[which].paused = 0;
slouken@60
   868
			mix_channel[which].fading = MIX_NO_FADING;
slouken@60
   869
			mix_channel[which].start_time = sdl_ticks;
slouken@60
   870
			mix_channel[which].expire = (ticks>0) ? (sdl_ticks + ticks) : 0;
megastep@4
   871
		}
megastep@4
   872
	}
slouken@172
   873
	SDL_UnlockAudio();
megastep@4
   874
megastep@4
   875
	/* Return the channel on which the sound is being played */
megastep@4
   876
	return(which);
megastep@4
   877
}
megastep@4
   878
megastep@7
   879
/* Change the expiration delay for a channel */
megastep@7
   880
int Mix_ExpireChannel(int which, int ticks)
megastep@7
   881
{
megastep@7
   882
	int status = 0;
megastep@7
   883
megastep@7
   884
	if ( which == -1 ) {
megastep@7
   885
		int i;
megastep@7
   886
		for ( i=0; i < num_channels; ++ i ) {
megastep@7
   887
			status += Mix_ExpireChannel(i, ticks);
megastep@7
   888
		}
megastep@7
   889
	} else if ( which < num_channels ) {
slouken@172
   890
		SDL_LockAudio();
slouken@60
   891
		mix_channel[which].expire = (ticks>0) ? (SDL_GetTicks() + ticks) : 0;
slouken@172
   892
		SDL_UnlockAudio();
megastep@7
   893
		++ status;
megastep@7
   894
	}
megastep@7
   895
	return(status);
megastep@7
   896
}
megastep@7
   897
megastep@4
   898
/* Fade in a sound on a channel, over ms milliseconds */
megastep@7
   899
int Mix_FadeInChannelTimed(int which, Mix_Chunk *chunk, int loops, int ms, int ticks)
megastep@4
   900
{
megastep@4
   901
	int i;
megastep@4
   902
megastep@4
   903
	/* Don't play null pointers :-) */
megastep@4
   904
	if ( chunk == NULL ) {
megastep@4
   905
		return(-1);
megastep@4
   906
	}
slouken@245
   907
	if ( !checkchunkintegral(chunk)) {
slouken@245
   908
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   909
		return(-1);
slouken@245
   910
	}
megastep@4
   911
megastep@4
   912
	/* Lock the mixer while modifying the playing channels */
slouken@172
   913
	SDL_LockAudio();
megastep@4
   914
	{
megastep@4
   915
		/* If which is -1, play on the first free channel */
megastep@4
   916
		if ( which == -1 ) {
megastep@7
   917
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   918
				if ( mix_channel[i].playing <= 0 )
megastep@4
   919
					break;
megastep@4
   920
			}
megastep@7
   921
			if ( i == num_channels ) {
megastep@4
   922
				which = -1;
megastep@4
   923
			} else {
megastep@4
   924
				which = i;
megastep@4
   925
			}
megastep@4
   926
		}
megastep@4
   927
megastep@4
   928
		/* Queue up the audio data for this channel */
slouken@492
   929
		if ( which >= 0 && which < num_channels ) {
slouken@158
   930
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   931
			if (Mix_Playing(which))
slouken@172
   932
				_Mix_channel_done_playing(which);
slouken@60
   933
			mix_channel[which].samples = chunk->abuf;
slouken@60
   934
			mix_channel[which].playing = chunk->alen;
slouken@60
   935
			mix_channel[which].looping = loops;
slouken@60
   936
			mix_channel[which].chunk = chunk;
slouken@60
   937
			mix_channel[which].paused = 0;
slouken@60
   938
			mix_channel[which].fading = MIX_FADING_IN;
slouken@60
   939
			mix_channel[which].fade_volume = mix_channel[which].volume;
icculus@444
   940
			mix_channel[which].fade_volume_reset = mix_channel[which].volume;
slouken@60
   941
			mix_channel[which].volume = 0;
slouken@60
   942
			mix_channel[which].fade_length = (Uint32)ms;
slouken@60
   943
			mix_channel[which].start_time = mix_channel[which].ticks_fade = sdl_ticks;
slouken@60
   944
			mix_channel[which].expire = (ticks > 0) ? (sdl_ticks+ticks) : 0;
slouken@0
   945
		}
slouken@0
   946
	}
slouken@172
   947
	SDL_UnlockAudio();
slouken@0
   948
slouken@0
   949
	/* Return the channel on which the sound is being played */
slouken@0
   950
	return(which);
slouken@0
   951
}
slouken@0
   952
slouken@0
   953
/* Set volume of a particular channel */
slouken@0
   954
int Mix_Volume(int which, int volume)
slouken@0
   955
{
slouken@0
   956
	int i;
slouken@492
   957
	int prev_volume = 0;
slouken@0
   958
slouken@0
   959
	if ( which == -1 ) {
megastep@7
   960
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   961
			prev_volume += Mix_Volume(i, volume);
slouken@0
   962
		}
megastep@7
   963
		prev_volume /= num_channels;
slouken@492
   964
	} else if ( which < num_channels ) {
slouken@60
   965
		prev_volume = mix_channel[which].volume;
slouken@163
   966
		if ( volume >= 0 ) {
slouken@163
   967
			if ( volume > SDL_MIX_MAXVOLUME ) {
slouken@163
   968
				volume = SDL_MIX_MAXVOLUME;
slouken@163
   969
			}
slouken@163
   970
			mix_channel[which].volume = volume;
slouken@0
   971
		}
slouken@0
   972
	}
slouken@0
   973
	return(prev_volume);
slouken@0
   974
}
slouken@0
   975
/* Set volume of a particular chunk */
slouken@0
   976
int Mix_VolumeChunk(Mix_Chunk *chunk, int volume)
slouken@0
   977
{
slouken@0
   978
	int prev_volume;
slouken@0
   979
slouken@0
   980
	prev_volume = chunk->volume;
slouken@0
   981
	if ( volume >= 0 ) {
slouken@0
   982
		if ( volume > MIX_MAX_VOLUME ) {
slouken@0
   983
			volume = MIX_MAX_VOLUME;
slouken@0
   984
		}
slouken@0
   985
		chunk->volume = volume;
slouken@0
   986
	}
slouken@0
   987
	return(prev_volume);
slouken@0
   988
}
slouken@0
   989
slouken@0
   990
/* Halt playing of a particular channel */
slouken@0
   991
int Mix_HaltChannel(int which)
slouken@0
   992
{
slouken@0
   993
	int i;
slouken@0
   994
slouken@0
   995
	if ( which == -1 ) {
megastep@7
   996
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   997
			Mix_HaltChannel(i);
slouken@0
   998
		}
slouken@492
   999
	} else if ( which < num_channels ) {
slouken@172
  1000
		SDL_LockAudio();
slouken@113
  1001
		if (mix_channel[which].playing) {
slouken@172
  1002
			_Mix_channel_done_playing(which);
icculus@539
  1003
			mix_channel[which].playing = 0;
icculus@539
  1004
			mix_channel[which].looping = 0;
slouken@113
  1005
		}
slouken@60
  1006
		mix_channel[which].expire = 0;
slouken@60
  1007
		if(mix_channel[which].fading != MIX_NO_FADING) /* Restore volume */
icculus@443
  1008
			mix_channel[which].volume = mix_channel[which].fade_volume_reset;
slouken@60
  1009
		mix_channel[which].fading = MIX_NO_FADING;
slouken@172
  1010
		SDL_UnlockAudio();
slouken@0
  1011
	}
slouken@0
  1012
	return(0);
slouken@0
  1013
}
slouken@0
  1014
megastep@7
  1015
/* Halt playing of a particular group of channels */
megastep@7
  1016
int Mix_HaltGroup(int tag)
megastep@7
  1017
{
megastep@7
  1018
	int i;
megastep@7
  1019
megastep@7
  1020
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1021
		if( mix_channel[i].tag == tag ) {
megastep@7
  1022
			Mix_HaltChannel(i);
megastep@7
  1023
		}
megastep@7
  1024
	}
megastep@7
  1025
	return(0);
megastep@7
  1026
}
megastep@7
  1027
megastep@4
  1028
/* Fade out a channel and then stop it automatically */
megastep@4
  1029
int Mix_FadeOutChannel(int which, int ms)
megastep@4
  1030
{
megastep@4
  1031
	int status;
megastep@4
  1032
megastep@4
  1033
	status = 0;
slouken@89
  1034
	if ( audio_opened ) {
slouken@89
  1035
		if ( which == -1 ) {
slouken@89
  1036
			int i;
megastep@4
  1037
slouken@89
  1038
			for ( i=0; i<num_channels; ++i ) {
slouken@89
  1039
				status += Mix_FadeOutChannel(i, ms);
slouken@89
  1040
			}
slouken@492
  1041
		} else if ( which < num_channels ) {
slouken@172
  1042
			SDL_LockAudio();
slouken@89
  1043
			if ( mix_channel[which].playing && 
slouken@89
  1044
			    (mix_channel[which].volume > 0) &&
slouken@89
  1045
			    (mix_channel[which].fading != MIX_FADING_OUT) ) {
icculus@443
  1046
				mix_channel[which].fade_volume = mix_channel[which].volume;
slouken@89
  1047
				mix_channel[which].fading = MIX_FADING_OUT;
slouken@89
  1048
				mix_channel[which].fade_length = ms;
slouken@89
  1049
				mix_channel[which].ticks_fade = SDL_GetTicks();
icculus@443
  1050
icculus@443
  1051
				/* only change fade_volume_reset if we're not fading. */
icculus@443
  1052
				if (mix_channel[which].fading == MIX_NO_FADING) {
icculus@443
  1053
				    mix_channel[which].fade_volume_reset = mix_channel[which].volume;
icculus@443
  1054
				}
slouken@89
  1055
				++status;
slouken@89
  1056
			}
slouken@172
  1057
			SDL_UnlockAudio();
megastep@4
  1058
		}
megastep@4
  1059
	}
megastep@4
  1060
	return(status);
megastep@4
  1061
}
megastep@4
  1062
megastep@7
  1063
/* Halt playing of a particular group of channels */
megastep@7
  1064
int Mix_FadeOutGroup(int tag, int ms)
megastep@7
  1065
{
megastep@7
  1066
	int i;
megastep@7
  1067
	int status = 0;
megastep@7
  1068
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1069
		if( mix_channel[i].tag == tag ) {
megastep@7
  1070
			status += Mix_FadeOutChannel(i,ms);
megastep@7
  1071
		}
megastep@7
  1072
	}
megastep@7
  1073
	return(status);
megastep@7
  1074
}
megastep@7
  1075
megastep@4
  1076
Mix_Fading Mix_FadingChannel(int which)
megastep@4
  1077
{
slouken@492
  1078
	if ( which < 0 || which >= num_channels ) {
slouken@492
  1079
		return MIX_NO_FADING;
slouken@492
  1080
	}
slouken@60
  1081
	return mix_channel[which].fading;
megastep@4
  1082
}
megastep@4
  1083
slouken@0
  1084
/* Check the status of a specific channel.
slouken@113
  1085
   If the specified mix_channel is -1, check all mix channels.
slouken@0
  1086
*/
slouken@0
  1087
int Mix_Playing(int which)
slouken@0
  1088
{
slouken@0
  1089
	int status;
slouken@0
  1090
slouken@0
  1091
	status = 0;
slouken@0
  1092
	if ( which == -1 ) {
slouken@0
  1093
		int i;
slouken@0
  1094
megastep@7
  1095
		for ( i=0; i<num_channels; ++i ) {
slouken@113
  1096
			if ((mix_channel[i].playing > 0) ||
slouken@113
  1097
				(mix_channel[i].looping > 0))
slouken@113
  1098
			{
slouken@0
  1099
				++status;
slouken@0
  1100
			}
slouken@0
  1101
		}
slouken@492
  1102
	} else if ( which < num_channels ) {
slouken@492
  1103
		if ( (mix_channel[which].playing > 0) ||
slouken@492
  1104
		     (mix_channel[which].looping > 0) )
slouken@113
  1105
		{
slouken@0
  1106
			++status;
slouken@0
  1107
		}
slouken@0
  1108
	}
slouken@0
  1109
	return(status);
slouken@0
  1110
}
slouken@0
  1111
slouken@92
  1112
/* rcg06072001 Get the chunk associated with a channel. */
slouken@92
  1113
Mix_Chunk *Mix_GetChunk(int channel)
slouken@92
  1114
{
slouken@92
  1115
	Mix_Chunk *retval = NULL;
slouken@92
  1116
slouken@92
  1117
	if ((channel >= 0) && (channel < num_channels)) {
slouken@92
  1118
		retval = mix_channel[channel].chunk;
slouken@92
  1119
	}
slouken@92
  1120
slouken@92
  1121
	return(retval);
slouken@92
  1122
}
slouken@92
  1123
slouken@0
  1124
/* Close the mixer, halting all playing audio */
slouken@0
  1125
void Mix_CloseAudio(void)
slouken@0
  1126
{
slouken@113
  1127
	int i;
slouken@113
  1128
slouken@0
  1129
	if ( audio_opened ) {
slouken@0
  1130
		if ( audio_opened == 1 ) {
slouken@113
  1131
			for (i = 0; i < num_channels; i++) {
slouken@113
  1132
				Mix_UnregisterAllEffects(i);
slouken@113
  1133
			}
slouken@113
  1134
			Mix_UnregisterAllEffects(MIX_CHANNEL_POST);
slouken@0
  1135
			close_music();
slouken@0
  1136
			Mix_HaltChannel(-1);
icculus@360
  1137
			_Mix_DeinitEffects();
slouken@0
  1138
			SDL_CloseAudio();
slouken@561
  1139
			SDL_free(mix_channel);
slouken@60
  1140
			mix_channel = NULL;
icculus@390
  1141
icculus@390
  1142
			/* rcg06042009 report available decoders at runtime. */
slouken@561
  1143
			SDL_free(chunk_decoders);
icculus@390
  1144
			chunk_decoders = NULL;
icculus@390
  1145
			num_decoders = 0;
slouken@0
  1146
		}
slouken@0
  1147
		--audio_opened;
slouken@0
  1148
	}
slouken@0
  1149
}
slouken@0
  1150
slouken@0
  1151
/* Pause a particular channel (or all) */
slouken@0
  1152
void Mix_Pause(int which)
slouken@0
  1153
{
megastep@8
  1154
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@0
  1155
	if ( which == -1 ) {
slouken@0
  1156
		int i;
slouken@0
  1157
megastep@7
  1158
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1159
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1160
				mix_channel[i].paused = sdl_ticks;
slouken@0
  1161
			}
slouken@0
  1162
		}
slouken@492
  1163
	} else if ( which < num_channels ) {
slouken@60
  1164
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1165
			mix_channel[which].paused = sdl_ticks;
slouken@0
  1166
		}
slouken@0
  1167
	}
slouken@0
  1168
}
slouken@0
  1169
slouken@0
  1170
/* Resume a paused channel */
slouken@0
  1171
void Mix_Resume(int which)
slouken@0
  1172
{
megastep@8
  1173
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@172
  1174
slouken@172
  1175
	SDL_LockAudio();
slouken@0
  1176
	if ( which == -1 ) {
slouken@0
  1177
		int i;
slouken@0
  1178
megastep@7
  1179
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1180
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1181
				if(mix_channel[i].expire > 0)
slouken@60
  1182
					mix_channel[i].expire += sdl_ticks - mix_channel[i].paused;
slouken@60
  1183
				mix_channel[i].paused = 0;
slouken@0
  1184
			}
slouken@0
  1185
		}
slouken@492
  1186
	} else if ( which < num_channels ) {
slouken@60
  1187
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1188
			if(mix_channel[which].expire > 0)
slouken@60
  1189
				mix_channel[which].expire += sdl_ticks - mix_channel[which].paused;
slouken@60
  1190
			mix_channel[which].paused = 0;
slouken@0
  1191
		}
slouken@0
  1192
	}
slouken@172
  1193
	SDL_UnlockAudio();
slouken@0
  1194
}
megastep@7
  1195
megastep@13
  1196
int Mix_Paused(int which)
megastep@13
  1197
{
megastep@14
  1198
	if ( which < 0 ) {
megastep@14
  1199
		int status = 0;
megastep@14
  1200
		int i;
megastep@14
  1201
		for( i=0; i < num_channels; ++i ) {
slouken@60
  1202
			if ( mix_channel[i].paused ) {
megastep@14
  1203
				++ status;
megastep@14
  1204
			}
megastep@14
  1205
		}
megastep@14
  1206
		return(status);
slouken@492
  1207
	} else if ( which < num_channels ) {
slouken@492
  1208
		return(mix_channel[which].paused != 0);
megastep@14
  1209
	} else {
slouken@492
  1210
		return(0);
megastep@14
  1211
	}
megastep@13
  1212
}
megastep@13
  1213
megastep@7
  1214
/* Change the group of a channel */
megastep@7
  1215
int Mix_GroupChannel(int which, int tag)
megastep@7
  1216
{
megastep@7
  1217
	if ( which < 0 || which > num_channels )
megastep@7
  1218
		return(0);
megastep@7
  1219
slouken@172
  1220
	SDL_LockAudio();
slouken@60
  1221
	mix_channel[which].tag = tag;
slouken@172
  1222
	SDL_UnlockAudio();
megastep@7
  1223
	return(1);
megastep@7
  1224
}
megastep@7
  1225
megastep@7
  1226
/* Assign several consecutive channels to a group */
megastep@7
  1227
int Mix_GroupChannels(int from, int to, int tag)
megastep@7
  1228
{
megastep@7
  1229
	int status = 0;
megastep@7
  1230
	for( ; from <= to; ++ from ) {
megastep@7
  1231
		status += Mix_GroupChannel(from, tag);
megastep@7
  1232
	}
megastep@7
  1233
	return(status);
megastep@7
  1234
}
megastep@7
  1235
megastep@7
  1236
/* Finds the first available channel in a group of channels */
megastep@7
  1237
int Mix_GroupAvailable(int tag)
megastep@7
  1238
{
megastep@7
  1239
	int i;
megastep@7
  1240
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1241
		if ( ((tag == -1) || (tag == mix_channel[i].tag)) &&
slouken@60
  1242
		                    (mix_channel[i].playing <= 0) )
megastep@7
  1243
			return i;
megastep@7
  1244
	}
megastep@7
  1245
	return(-1);
megastep@7
  1246
}
megastep@7
  1247
megastep@7
  1248
int Mix_GroupCount(int tag)
megastep@7
  1249
{
megastep@7
  1250
	int count = 0;
megastep@7
  1251
	int i;
megastep@7
  1252
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1253
		if ( mix_channel[i].tag==tag || tag==-1 )
megastep@7
  1254
			++ count;
megastep@7
  1255
	}
megastep@7
  1256
	return(count);
megastep@7
  1257
}
megastep@8
  1258
megastep@8
  1259
/* Finds the "oldest" sample playing in a group of channels */
megastep@8
  1260
int Mix_GroupOldest(int tag)
megastep@8
  1261
{
megastep@8
  1262
	int chan = -1;
megastep@8
  1263
	Uint32 mintime = SDL_GetTicks();
megastep@8
  1264
	int i;
megastep@8
  1265
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1266
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1267
			 && mix_channel[i].start_time <= mintime ) {
slouken@60
  1268
			mintime = mix_channel[i].start_time;
megastep@8
  1269
			chan = i;
megastep@8
  1270
		}
megastep@8
  1271
	}
megastep@8
  1272
	return(chan);
megastep@8
  1273
}
megastep@8
  1274
megastep@8
  1275
/* Finds the "most recent" (i.e. last) sample playing in a group of channels */
megastep@8
  1276
int Mix_GroupNewer(int tag)
megastep@8
  1277
{
megastep@8
  1278
	int chan = -1;
megastep@8
  1279
	Uint32 maxtime = 0;
megastep@8
  1280
	int i;
megastep@8
  1281
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1282
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1283
			 && mix_channel[i].start_time >= maxtime ) {
slouken@60
  1284
			maxtime = mix_channel[i].start_time;
megastep@8
  1285
			chan = i;
megastep@8
  1286
		}
megastep@8
  1287
	}
megastep@8
  1288
	return(chan);
megastep@8
  1289
}
slouken@113
  1290
slouken@113
  1291
slouken@113
  1292
slouken@113
  1293
/*
slouken@113
  1294
 * rcg06122001 The special effects exportable API.
slouken@113
  1295
 *  Please see effect_*.c for internally-implemented effects, such
slouken@113
  1296
 *  as Mix_SetPanning().
slouken@113
  1297
 */
slouken@113
  1298
slouken@164
  1299
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1300
static int _Mix_register_effect(effect_info **e, Mix_EffectFunc_t f,
slouken@164
  1301
				Mix_EffectDone_t d, void *arg)
slouken@113
  1302
{
icculus@512
  1303
	effect_info *new_e;
slouken@113
  1304
slouken@113
  1305
	if (!e) {
slouken@113
  1306
		Mix_SetError("Internal error");
slouken@113
  1307
		return(0);
slouken@113
  1308
	}
slouken@113
  1309
slouken@113
  1310
	if (f == NULL) {
slouken@113
  1311
		Mix_SetError("NULL effect callback");
slouken@113
  1312
		return(0);
slouken@113
  1313
	}
slouken@113
  1314
slouken@561
  1315
	new_e = SDL_malloc(sizeof (effect_info));
slouken@113
  1316
	if (new_e == NULL) {
slouken@113
  1317
		Mix_SetError("Out of memory");
slouken@113
  1318
		return(0);
slouken@113
  1319
	}
slouken@113
  1320
slouken@113
  1321
	new_e->callback = f;
slouken@113
  1322
	new_e->done_callback = d;
slouken@113
  1323
	new_e->udata = arg;
slouken@113
  1324
	new_e->next = NULL;
slouken@113
  1325
slouken@113
  1326
	/* add new effect to end of linked list... */
slouken@113
  1327
	if (*e == NULL) {
slouken@113
  1328
		*e = new_e;
slouken@113
  1329
	} else {
slouken@113
  1330
		effect_info *cur = *e;
slouken@113
  1331
		while (1) {
slouken@113
  1332
			if (cur->next == NULL) {
slouken@113
  1333
				cur->next = new_e;
slouken@113
  1334
				break;
slouken@113
  1335
			}
slouken@113
  1336
			cur = cur->next;
slouken@113
  1337
		}
slouken@113
  1338
	}
slouken@113
  1339
slouken@113
  1340
	return(1);
slouken@113
  1341
}
slouken@113
  1342
slouken@113
  1343
slouken@164
  1344
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1345
static int _Mix_remove_effect(int channel, effect_info **e, Mix_EffectFunc_t f)
slouken@113
  1346
{
slouken@113
  1347
	effect_info *cur;
slouken@113
  1348
	effect_info *prev = NULL;
slouken@113
  1349
	effect_info *next = NULL;
slouken@113
  1350
slouken@113
  1351
	if (!e) {
slouken@113
  1352
		Mix_SetError("Internal error");
slouken@113
  1353
		return(0);
slouken@113
  1354
	}
slouken@113
  1355
slouken@113
  1356
	for (cur = *e; cur != NULL; cur = cur->next) {
slouken@113
  1357
		if (cur->callback == f) {
slouken@113
  1358
			next = cur->next;
slouken@113
  1359
			if (cur->done_callback != NULL) {
slouken@113
  1360
				cur->done_callback(channel, cur->udata);
slouken@113
  1361
			}
slouken@561
  1362
			SDL_free(cur);
slouken@113
  1363
slouken@113
  1364
			if (prev == NULL) {   /* removing first item of list? */
slouken@113
  1365
				*e = next;
slouken@113
  1366
			} else {
slouken@113
  1367
				prev->next = next;
slouken@113
  1368
			}
slouken@113
  1369
			return(1);
slouken@113
  1370
		}
slouken@113
  1371
		prev = cur;
slouken@113
  1372
	}
slouken@113
  1373
slouken@113
  1374
	Mix_SetError("No such effect registered");
slouken@113
  1375
	return(0);
slouken@113
  1376
}
slouken@113
  1377
slouken@113
  1378
slouken@164
  1379
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1380
static int _Mix_remove_all_effects(int channel, effect_info **e)
slouken@113
  1381
{
slouken@113
  1382
	effect_info *cur;
slouken@113
  1383
	effect_info *next;
slouken@113
  1384
slouken@113
  1385
	if (!e) {
slouken@113
  1386
		Mix_SetError("Internal error");
slouken@113
  1387
		return(0);
slouken@113
  1388
	}
slouken@113
  1389
slouken@113
  1390
	for (cur = *e; cur != NULL; cur = next) {
slouken@113
  1391
		next = cur->next;
slouken@113
  1392
		if (cur->done_callback != NULL) {
slouken@113
  1393
			cur->done_callback(channel, cur->udata);
slouken@113
  1394
		}
slouken@561
  1395
		SDL_free(cur);
slouken@113
  1396
	}
slouken@113
  1397
	*e = NULL;
slouken@113
  1398
slouken@113
  1399
	return(1);
slouken@113
  1400
}
slouken@113
  1401
slouken@113
  1402
icculus@442
  1403
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1404
int _Mix_RegisterEffect_locked(int channel, Mix_EffectFunc_t f,
slouken@164
  1405
			Mix_EffectDone_t d, void *arg)
slouken@113
  1406
{
slouken@113
  1407
	effect_info **e = NULL;
slouken@113
  1408
slouken@113
  1409
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1410
		e = &posteffects;
slouken@113
  1411
	} else {
slouken@113
  1412
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1413
			Mix_SetError("Invalid channel number");
slouken@113
  1414
			return(0);
slouken@113
  1415
		}
slouken@113
  1416
		e = &mix_channel[channel].effects;
slouken@113
  1417
	}
slouken@113
  1418
icculus@442
  1419
	return _Mix_register_effect(e, f, d, arg);
slouken@113
  1420
}
slouken@113
  1421
icculus@442
  1422
int Mix_RegisterEffect(int channel, Mix_EffectFunc_t f,
icculus@442
  1423
			Mix_EffectDone_t d, void *arg)
icculus@442
  1424
{
icculus@442
  1425
    int retval;
icculus@442
  1426
	SDL_LockAudio();
icculus@442
  1427
	retval = _Mix_RegisterEffect_locked(channel, f, d, arg);
icculus@442
  1428
	SDL_UnlockAudio();
icculus@442
  1429
    return retval;
icculus@442
  1430
}
slouken@113
  1431
icculus@442
  1432
icculus@442
  1433
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1434
int _Mix_UnregisterEffect_locked(int channel, Mix_EffectFunc_t f)
slouken@113
  1435
{
slouken@113
  1436
	effect_info **e = NULL;
slouken@113
  1437
slouken@113
  1438
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1439
		e = &posteffects;
slouken@113
  1440
	} else {
slouken@113
  1441
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1442
			Mix_SetError("Invalid channel number");
slouken@113
  1443
			return(0);
slouken@113
  1444
		}
slouken@113
  1445
		e = &mix_channel[channel].effects;
slouken@113
  1446
	}
slouken@113
  1447
icculus@442
  1448
	return _Mix_remove_effect(channel, e, f);
icculus@442
  1449
}
icculus@442
  1450
icculus@442
  1451
int Mix_UnregisterEffect(int channel, Mix_EffectFunc_t f)
icculus@442
  1452
{
icculus@442
  1453
	int retval;
slouken@164
  1454
	SDL_LockAudio();
icculus@442
  1455
	retval = _Mix_UnregisterEffect_locked(channel, f);
slouken@164
  1456
	SDL_UnlockAudio();
slouken@164
  1457
	return(retval);
slouken@164
  1458
}
slouken@164
  1459
icculus@442
  1460
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1461
int _Mix_UnregisterAllEffects_locked(int channel)
slouken@164
  1462
{
slouken@164
  1463
	effect_info **e = NULL;
slouken@164
  1464
slouken@164
  1465
	if (channel == MIX_CHANNEL_POST) {
slouken@164
  1466
		e = &posteffects;
slouken@164
  1467
	} else {
slouken@164
  1468
		if ((channel < 0) || (channel >= num_channels)) {
slouken@164
  1469
			Mix_SetError("Invalid channel number");
slouken@164
  1470
			return(0);
slouken@164
  1471
		}
slouken@164
  1472
		e = &mix_channel[channel].effects;
slouken@164
  1473
	}
slouken@164
  1474
icculus@442
  1475
	return _Mix_remove_all_effects(channel, e);
icculus@442
  1476
}
icculus@442
  1477
icculus@442
  1478
int Mix_UnregisterAllEffects(int channel)
icculus@442
  1479
{
icculus@442
  1480
	int retval;
slouken@164
  1481
	SDL_LockAudio();
icculus@442
  1482
	retval = _Mix_UnregisterAllEffects_locked(channel);
slouken@164
  1483
	SDL_UnlockAudio();
slouken@164
  1484
	return(retval);
slouken@113
  1485
}
slouken@113
  1486
slouken@113
  1487
/* end of mixer.c ... */
slouken@113
  1488