mixer.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 17 Apr 2013 01:27:39 -0700
changeset 611 595186c9c0ec
parent 601 05123263dab3
child 617 87116a42526e
permissions -rw-r--r--
Build music support into the framework
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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) 1997-2013 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");
slouken@583
   613
			if ( freesrc ) {
slouken@583
   614
				SDL_RWclose(src);
slouken@583
   615
			}
slouken@583
   616
			loaded = NULL;
slouken@583
   617
			break;
slouken@111
   618
	}
slouken@111
   619
	if ( !loaded ) {
slouken@583
   620
		/* The individual loaders have closed src if needed */
slouken@561
   621
		SDL_free(chunk);
slouken@0
   622
		return(NULL);
slouken@0
   623
	}
slouken@91
   624
slouken@0
   625
#if 0
slouken@0
   626
	PrintFormat("Audio device", &mixer);
slouken@0
   627
	PrintFormat("-- Wave file", &wavespec);
slouken@0
   628
#endif
slouken@0
   629
slouken@0
   630
	/* Build the audio converter and create conversion buffers */
slouken@560
   631
	if ( wavespec.format != mixer.format ||
slouken@560
   632
		 wavespec.channels != mixer.channels ||
slouken@560
   633
		 wavespec.freq != mixer.freq ) {
slouken@560
   634
		if ( SDL_BuildAudioCVT(&wavecvt,
slouken@560
   635
				wavespec.format, wavespec.channels, wavespec.freq,
slouken@560
   636
				mixer.format, mixer.channels, mixer.freq) < 0 ) {
slouken@561
   637
			SDL_free(chunk->abuf);
slouken@561
   638
			SDL_free(chunk);
slouken@560
   639
			return(NULL);
slouken@560
   640
		}
slouken@560
   641
		samplesize = ((wavespec.format & 0xFF)/8)*wavespec.channels;
slouken@560
   642
		wavecvt.len = chunk->alen & ~(samplesize-1);
slouken@561
   643
		wavecvt.buf = (Uint8 *)SDL_calloc(1, wavecvt.len*wavecvt.len_mult);
slouken@560
   644
		if ( wavecvt.buf == NULL ) {
slouken@560
   645
			SDL_SetError("Out of memory");
slouken@561
   646
			SDL_free(chunk->abuf);
slouken@561
   647
			SDL_free(chunk);
slouken@560
   648
			return(NULL);
slouken@560
   649
		}
slouken@560
   650
		memcpy(wavecvt.buf, chunk->abuf, chunk->alen);
slouken@561
   651
		SDL_free(chunk->abuf);
slouken@560
   652
slouken@560
   653
		/* Run the audio converter */
slouken@560
   654
		if ( SDL_ConvertAudio(&wavecvt) < 0 ) {
slouken@561
   655
			SDL_free(wavecvt.buf);
slouken@561
   656
			SDL_free(chunk);
slouken@560
   657
			return(NULL);
slouken@560
   658
		}
slouken@562
   659
slouken@562
   660
		chunk->abuf = wavecvt.buf;
slouken@562
   661
		chunk->alen = wavecvt.len_cvt;
slouken@0
   662
	}
slouken@0
   663
slouken@1
   664
	chunk->allocated = 1;
slouken@0
   665
	chunk->volume = MIX_MAX_VOLUME;
icculus@516
   666
slouken@0
   667
	return(chunk);
slouken@0
   668
}
slouken@0
   669
slouken@1
   670
/* Load a wave file of the mixer format from a memory buffer */
slouken@1
   671
Mix_Chunk *Mix_QuickLoad_WAV(Uint8 *mem)
slouken@1
   672
{
slouken@1
   673
	Mix_Chunk *chunk;
slouken@1
   674
	Uint8 magic[4];
slouken@1
   675
slouken@1
   676
	/* Make sure audio has been opened */
slouken@1
   677
	if ( ! audio_opened ) {
slouken@1
   678
		SDL_SetError("Audio device hasn't been opened");
slouken@1
   679
		return(NULL);
slouken@1
   680
	}
slouken@1
   681
slouken@1
   682
	/* Allocate the chunk memory */
slouken@561
   683
	chunk = (Mix_Chunk *)SDL_calloc(1,sizeof(Mix_Chunk));
slouken@1
   684
	if ( chunk == NULL ) {
slouken@1
   685
		SDL_SetError("Out of memory");
slouken@1
   686
		return(NULL);
slouken@1
   687
	}
slouken@1
   688
slouken@1
   689
	/* Essentially just skip to the audio data (no error checking - fast) */
slouken@1
   690
	chunk->allocated = 0;
slouken@1
   691
	mem += 12; /* WAV header */
slouken@1
   692
	do {
slouken@1
   693
		memcpy(magic, mem, 4);
slouken@1
   694
		mem += 4;
slouken@1
   695
		chunk->alen = ((mem[3]<<24)|(mem[2]<<16)|(mem[1]<<8)|(mem[0]));
slouken@1
   696
		mem += 4;
slouken@1
   697
		chunk->abuf = mem;
slouken@1
   698
		mem += chunk->alen;
slouken@1
   699
	} while ( memcmp(magic, "data", 4) != 0 );
slouken@1
   700
	chunk->volume = MIX_MAX_VOLUME;
slouken@1
   701
slouken@1
   702
	return(chunk);
slouken@1
   703
}
slouken@1
   704
slouken@174
   705
/* Load raw audio data of the mixer format from a memory buffer */
slouken@174
   706
Mix_Chunk *Mix_QuickLoad_RAW(Uint8 *mem, Uint32 len)
slouken@174
   707
{
slouken@174
   708
	Mix_Chunk *chunk;
slouken@174
   709
slouken@174
   710
	/* Make sure audio has been opened */
slouken@174
   711
	if ( ! audio_opened ) {
slouken@174
   712
		SDL_SetError("Audio device hasn't been opened");
slouken@174
   713
		return(NULL);
slouken@174
   714
	}
slouken@174
   715
slouken@174
   716
	/* Allocate the chunk memory */
slouken@561
   717
	chunk = (Mix_Chunk *)SDL_malloc(sizeof(Mix_Chunk));
slouken@174
   718
	if ( chunk == NULL ) {
slouken@174
   719
		SDL_SetError("Out of memory");
slouken@174
   720
		return(NULL);
slouken@174
   721
	}
slouken@174
   722
slouken@174
   723
	/* Essentially just point at the audio data (no error checking - fast) */
slouken@174
   724
	chunk->allocated = 0;
slouken@174
   725
	chunk->alen = len;
slouken@174
   726
	chunk->abuf = mem;
slouken@174
   727
	chunk->volume = MIX_MAX_VOLUME;
slouken@174
   728
slouken@174
   729
	return(chunk);
slouken@174
   730
}
slouken@174
   731
slouken@0
   732
/* Free an audio chunk previously loaded */
slouken@0
   733
void Mix_FreeChunk(Mix_Chunk *chunk)
slouken@0
   734
{
slouken@0
   735
	int i;
slouken@0
   736
slouken@0
   737
	/* Caution -- if the chunk is playing, the mixer will crash */
slouken@0
   738
	if ( chunk ) {
slouken@0
   739
		/* Guarantee that this chunk isn't playing */
slouken@172
   740
		SDL_LockAudio();
slouken@60
   741
		if ( mix_channel ) {
slouken@60
   742
			for ( i=0; i<num_channels; ++i ) {
slouken@60
   743
				if ( chunk == mix_channel[i].chunk ) {
slouken@60
   744
					mix_channel[i].playing = 0;
icculus@539
   745
					mix_channel[i].looping = 0;
slouken@60
   746
				}
slouken@0
   747
			}
slouken@0
   748
		}
slouken@172
   749
		SDL_UnlockAudio();
slouken@0
   750
		/* Actually free the chunk */
slouken@1
   751
		if ( chunk->allocated ) {
slouken@561
   752
			SDL_free(chunk->abuf);
slouken@1
   753
		}
slouken@561
   754
		SDL_free(chunk);
slouken@0
   755
	}
slouken@0
   756
}
slouken@0
   757
slouken@26
   758
/* Set a function that is called after all mixing is performed.
slouken@26
   759
   This can be used to provide real-time visual display of the audio stream
slouken@26
   760
   or add a custom mixer filter for the stream data.
slouken@26
   761
*/
slouken@26
   762
void Mix_SetPostMix(void (*mix_func)
slouken@26
   763
                    (void *udata, Uint8 *stream, int len), void *arg)
slouken@26
   764
{
slouken@26
   765
	SDL_LockAudio();
slouken@26
   766
	mix_postmix_data = arg;
slouken@26
   767
	mix_postmix = mix_func;
slouken@26
   768
	SDL_UnlockAudio();
slouken@26
   769
}
slouken@26
   770
slouken@0
   771
/* Add your own music player or mixer function.
slouken@0
   772
   If 'mix_func' is NULL, the default music player is re-enabled.
slouken@0
   773
 */
slouken@0
   774
void Mix_HookMusic(void (*mix_func)(void *udata, Uint8 *stream, int len),
slouken@0
   775
                                                                void *arg)
slouken@0
   776
{
slouken@0
   777
	SDL_LockAudio();
slouken@0
   778
	if ( mix_func != NULL ) {
slouken@0
   779
		music_data = arg;
slouken@0
   780
		mix_music = mix_func;
slouken@0
   781
	} else {
slouken@0
   782
		music_data = NULL;
slouken@0
   783
		mix_music = music_mixer;
slouken@0
   784
	}
slouken@0
   785
	SDL_UnlockAudio();
slouken@0
   786
}
slouken@0
   787
slouken@0
   788
void *Mix_GetMusicHookData(void)
slouken@0
   789
{
slouken@0
   790
	return(music_data);
slouken@0
   791
}
slouken@0
   792
slouken@92
   793
void Mix_ChannelFinished(void (*channel_finished)(int channel))
slouken@92
   794
{
slouken@172
   795
	SDL_LockAudio();
slouken@172
   796
	channel_done_callback = channel_finished;
slouken@172
   797
	SDL_UnlockAudio();
slouken@92
   798
}
slouken@92
   799
slouken@92
   800
slouken@0
   801
/* Reserve the first channels (0 -> n-1) for the application, i.e. don't allocate
slouken@0
   802
   them dynamically to the next sample if requested with a -1 value below.
slouken@0
   803
   Returns the number of reserved channels.
slouken@0
   804
 */
slouken@0
   805
int Mix_ReserveChannels(int num)
slouken@0
   806
{
megastep@7
   807
	if (num > num_channels)
megastep@7
   808
		num = num_channels;
slouken@0
   809
	reserved_channels = num;
slouken@0
   810
	return num;
slouken@0
   811
}
slouken@0
   812
slouken@245
   813
static int checkchunkintegral(Mix_Chunk *chunk)
slouken@245
   814
{
slouken@245
   815
	int frame_width = 1;
slouken@245
   816
slouken@245
   817
	if ((mixer.format & 0xFF) == 16) frame_width = 2;
slouken@245
   818
	frame_width *= mixer.channels;
slouken@245
   819
	while (chunk->alen % frame_width) chunk->alen--;
slouken@245
   820
	return chunk->alen;
slouken@245
   821
}
slouken@245
   822
slouken@0
   823
/* Play an audio chunk on a specific channel.
slouken@0
   824
   If the specified channel is -1, play on the first free channel.
megastep@7
   825
   'ticks' is the number of milliseconds at most to play the sample, or -1
megastep@7
   826
   if there is no limit.
slouken@0
   827
   Returns which channel was used to play the sound.
slouken@0
   828
*/
megastep@7
   829
int Mix_PlayChannelTimed(int which, Mix_Chunk *chunk, int loops, int ticks)
slouken@0
   830
{
slouken@0
   831
	int i;
slouken@0
   832
slouken@0
   833
	/* Don't play null pointers :-) */
slouken@0
   834
	if ( chunk == NULL ) {
slouken@178
   835
		Mix_SetError("Tried to play a NULL chunk");
slouken@0
   836
		return(-1);
slouken@0
   837
	}
slouken@245
   838
	if ( !checkchunkintegral(chunk)) {
slouken@245
   839
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   840
		return(-1);
slouken@245
   841
	}
slouken@0
   842
slouken@0
   843
	/* Lock the mixer while modifying the playing channels */
slouken@172
   844
	SDL_LockAudio();
slouken@0
   845
	{
slouken@0
   846
		/* If which is -1, play on the first free channel */
slouken@0
   847
		if ( which == -1 ) {
megastep@7
   848
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   849
				if ( mix_channel[i].playing <= 0 )
slouken@0
   850
					break;
slouken@0
   851
			}
megastep@7
   852
			if ( i == num_channels ) {
slouken@178
   853
				Mix_SetError("No free channels available");
slouken@0
   854
				which = -1;
slouken@0
   855
			} else {
slouken@0
   856
				which = i;
slouken@0
   857
			}
slouken@0
   858
		}
slouken@0
   859
slouken@0
   860
		/* Queue up the audio data for this channel */
slouken@492
   861
		if ( which >= 0 && which < num_channels ) {
slouken@158
   862
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   863
			if (Mix_Playing(which))
slouken@172
   864
				_Mix_channel_done_playing(which);
slouken@60
   865
			mix_channel[which].samples = chunk->abuf;
slouken@60
   866
			mix_channel[which].playing = chunk->alen;
slouken@60
   867
			mix_channel[which].looping = loops;
slouken@60
   868
			mix_channel[which].chunk = chunk;
slouken@60
   869
			mix_channel[which].paused = 0;
slouken@60
   870
			mix_channel[which].fading = MIX_NO_FADING;
slouken@60
   871
			mix_channel[which].start_time = sdl_ticks;
slouken@60
   872
			mix_channel[which].expire = (ticks>0) ? (sdl_ticks + ticks) : 0;
megastep@4
   873
		}
megastep@4
   874
	}
slouken@172
   875
	SDL_UnlockAudio();
megastep@4
   876
megastep@4
   877
	/* Return the channel on which the sound is being played */
megastep@4
   878
	return(which);
megastep@4
   879
}
megastep@4
   880
megastep@7
   881
/* Change the expiration delay for a channel */
megastep@7
   882
int Mix_ExpireChannel(int which, int ticks)
megastep@7
   883
{
megastep@7
   884
	int status = 0;
megastep@7
   885
megastep@7
   886
	if ( which == -1 ) {
megastep@7
   887
		int i;
megastep@7
   888
		for ( i=0; i < num_channels; ++ i ) {
megastep@7
   889
			status += Mix_ExpireChannel(i, ticks);
megastep@7
   890
		}
megastep@7
   891
	} else if ( which < num_channels ) {
slouken@172
   892
		SDL_LockAudio();
slouken@60
   893
		mix_channel[which].expire = (ticks>0) ? (SDL_GetTicks() + ticks) : 0;
slouken@172
   894
		SDL_UnlockAudio();
megastep@7
   895
		++ status;
megastep@7
   896
	}
megastep@7
   897
	return(status);
megastep@7
   898
}
megastep@7
   899
megastep@4
   900
/* Fade in a sound on a channel, over ms milliseconds */
megastep@7
   901
int Mix_FadeInChannelTimed(int which, Mix_Chunk *chunk, int loops, int ms, int ticks)
megastep@4
   902
{
megastep@4
   903
	int i;
megastep@4
   904
megastep@4
   905
	/* Don't play null pointers :-) */
megastep@4
   906
	if ( chunk == NULL ) {
megastep@4
   907
		return(-1);
megastep@4
   908
	}
slouken@245
   909
	if ( !checkchunkintegral(chunk)) {
slouken@245
   910
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   911
		return(-1);
slouken@245
   912
	}
megastep@4
   913
megastep@4
   914
	/* Lock the mixer while modifying the playing channels */
slouken@172
   915
	SDL_LockAudio();
megastep@4
   916
	{
megastep@4
   917
		/* If which is -1, play on the first free channel */
megastep@4
   918
		if ( which == -1 ) {
megastep@7
   919
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   920
				if ( mix_channel[i].playing <= 0 )
megastep@4
   921
					break;
megastep@4
   922
			}
megastep@7
   923
			if ( i == num_channels ) {
megastep@4
   924
				which = -1;
megastep@4
   925
			} else {
megastep@4
   926
				which = i;
megastep@4
   927
			}
megastep@4
   928
		}
megastep@4
   929
megastep@4
   930
		/* Queue up the audio data for this channel */
slouken@492
   931
		if ( which >= 0 && which < num_channels ) {
slouken@158
   932
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   933
			if (Mix_Playing(which))
slouken@172
   934
				_Mix_channel_done_playing(which);
slouken@60
   935
			mix_channel[which].samples = chunk->abuf;
slouken@60
   936
			mix_channel[which].playing = chunk->alen;
slouken@60
   937
			mix_channel[which].looping = loops;
slouken@60
   938
			mix_channel[which].chunk = chunk;
slouken@60
   939
			mix_channel[which].paused = 0;
slouken@60
   940
			mix_channel[which].fading = MIX_FADING_IN;
slouken@60
   941
			mix_channel[which].fade_volume = mix_channel[which].volume;
icculus@444
   942
			mix_channel[which].fade_volume_reset = mix_channel[which].volume;
slouken@60
   943
			mix_channel[which].volume = 0;
slouken@60
   944
			mix_channel[which].fade_length = (Uint32)ms;
slouken@60
   945
			mix_channel[which].start_time = mix_channel[which].ticks_fade = sdl_ticks;
slouken@60
   946
			mix_channel[which].expire = (ticks > 0) ? (sdl_ticks+ticks) : 0;
slouken@0
   947
		}
slouken@0
   948
	}
slouken@172
   949
	SDL_UnlockAudio();
slouken@0
   950
slouken@0
   951
	/* Return the channel on which the sound is being played */
slouken@0
   952
	return(which);
slouken@0
   953
}
slouken@0
   954
slouken@0
   955
/* Set volume of a particular channel */
slouken@0
   956
int Mix_Volume(int which, int volume)
slouken@0
   957
{
slouken@0
   958
	int i;
slouken@492
   959
	int prev_volume = 0;
slouken@0
   960
slouken@0
   961
	if ( which == -1 ) {
megastep@7
   962
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   963
			prev_volume += Mix_Volume(i, volume);
slouken@0
   964
		}
megastep@7
   965
		prev_volume /= num_channels;
slouken@492
   966
	} else if ( which < num_channels ) {
slouken@60
   967
		prev_volume = mix_channel[which].volume;
slouken@163
   968
		if ( volume >= 0 ) {
slouken@163
   969
			if ( volume > SDL_MIX_MAXVOLUME ) {
slouken@163
   970
				volume = SDL_MIX_MAXVOLUME;
slouken@163
   971
			}
slouken@163
   972
			mix_channel[which].volume = volume;
slouken@0
   973
		}
slouken@0
   974
	}
slouken@0
   975
	return(prev_volume);
slouken@0
   976
}
slouken@0
   977
/* Set volume of a particular chunk */
slouken@0
   978
int Mix_VolumeChunk(Mix_Chunk *chunk, int volume)
slouken@0
   979
{
slouken@0
   980
	int prev_volume;
slouken@0
   981
slouken@0
   982
	prev_volume = chunk->volume;
slouken@0
   983
	if ( volume >= 0 ) {
slouken@0
   984
		if ( volume > MIX_MAX_VOLUME ) {
slouken@0
   985
			volume = MIX_MAX_VOLUME;
slouken@0
   986
		}
slouken@0
   987
		chunk->volume = volume;
slouken@0
   988
	}
slouken@0
   989
	return(prev_volume);
slouken@0
   990
}
slouken@0
   991
slouken@0
   992
/* Halt playing of a particular channel */
slouken@0
   993
int Mix_HaltChannel(int which)
slouken@0
   994
{
slouken@0
   995
	int i;
slouken@0
   996
slouken@0
   997
	if ( which == -1 ) {
megastep@7
   998
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   999
			Mix_HaltChannel(i);
slouken@0
  1000
		}
slouken@492
  1001
	} else if ( which < num_channels ) {
slouken@172
  1002
		SDL_LockAudio();
slouken@113
  1003
		if (mix_channel[which].playing) {
slouken@172
  1004
			_Mix_channel_done_playing(which);
icculus@539
  1005
			mix_channel[which].playing = 0;
icculus@539
  1006
			mix_channel[which].looping = 0;
slouken@113
  1007
		}
slouken@60
  1008
		mix_channel[which].expire = 0;
slouken@60
  1009
		if(mix_channel[which].fading != MIX_NO_FADING) /* Restore volume */
icculus@443
  1010
			mix_channel[which].volume = mix_channel[which].fade_volume_reset;
slouken@60
  1011
		mix_channel[which].fading = MIX_NO_FADING;
slouken@172
  1012
		SDL_UnlockAudio();
slouken@0
  1013
	}
slouken@0
  1014
	return(0);
slouken@0
  1015
}
slouken@0
  1016
megastep@7
  1017
/* Halt playing of a particular group of channels */
megastep@7
  1018
int Mix_HaltGroup(int tag)
megastep@7
  1019
{
megastep@7
  1020
	int i;
megastep@7
  1021
megastep@7
  1022
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1023
		if( mix_channel[i].tag == tag ) {
megastep@7
  1024
			Mix_HaltChannel(i);
megastep@7
  1025
		}
megastep@7
  1026
	}
megastep@7
  1027
	return(0);
megastep@7
  1028
}
megastep@7
  1029
megastep@4
  1030
/* Fade out a channel and then stop it automatically */
megastep@4
  1031
int Mix_FadeOutChannel(int which, int ms)
megastep@4
  1032
{
megastep@4
  1033
	int status;
megastep@4
  1034
megastep@4
  1035
	status = 0;
slouken@89
  1036
	if ( audio_opened ) {
slouken@89
  1037
		if ( which == -1 ) {
slouken@89
  1038
			int i;
megastep@4
  1039
slouken@89
  1040
			for ( i=0; i<num_channels; ++i ) {
slouken@89
  1041
				status += Mix_FadeOutChannel(i, ms);
slouken@89
  1042
			}
slouken@492
  1043
		} else if ( which < num_channels ) {
slouken@172
  1044
			SDL_LockAudio();
slouken@89
  1045
			if ( mix_channel[which].playing && 
slouken@89
  1046
			    (mix_channel[which].volume > 0) &&
slouken@89
  1047
			    (mix_channel[which].fading != MIX_FADING_OUT) ) {
icculus@443
  1048
				mix_channel[which].fade_volume = mix_channel[which].volume;
slouken@89
  1049
				mix_channel[which].fading = MIX_FADING_OUT;
slouken@89
  1050
				mix_channel[which].fade_length = ms;
slouken@89
  1051
				mix_channel[which].ticks_fade = SDL_GetTicks();
icculus@443
  1052
icculus@443
  1053
				/* only change fade_volume_reset if we're not fading. */
icculus@443
  1054
				if (mix_channel[which].fading == MIX_NO_FADING) {
icculus@443
  1055
				    mix_channel[which].fade_volume_reset = mix_channel[which].volume;
icculus@443
  1056
				}
slouken@89
  1057
				++status;
slouken@89
  1058
			}
slouken@172
  1059
			SDL_UnlockAudio();
megastep@4
  1060
		}
megastep@4
  1061
	}
megastep@4
  1062
	return(status);
megastep@4
  1063
}
megastep@4
  1064
megastep@7
  1065
/* Halt playing of a particular group of channels */
megastep@7
  1066
int Mix_FadeOutGroup(int tag, int ms)
megastep@7
  1067
{
megastep@7
  1068
	int i;
megastep@7
  1069
	int status = 0;
megastep@7
  1070
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1071
		if( mix_channel[i].tag == tag ) {
megastep@7
  1072
			status += Mix_FadeOutChannel(i,ms);
megastep@7
  1073
		}
megastep@7
  1074
	}
megastep@7
  1075
	return(status);
megastep@7
  1076
}
megastep@7
  1077
megastep@4
  1078
Mix_Fading Mix_FadingChannel(int which)
megastep@4
  1079
{
slouken@492
  1080
	if ( which < 0 || which >= num_channels ) {
slouken@492
  1081
		return MIX_NO_FADING;
slouken@492
  1082
	}
slouken@60
  1083
	return mix_channel[which].fading;
megastep@4
  1084
}
megastep@4
  1085
slouken@0
  1086
/* Check the status of a specific channel.
slouken@113
  1087
   If the specified mix_channel is -1, check all mix channels.
slouken@0
  1088
*/
slouken@0
  1089
int Mix_Playing(int which)
slouken@0
  1090
{
slouken@0
  1091
	int status;
slouken@0
  1092
slouken@0
  1093
	status = 0;
slouken@0
  1094
	if ( which == -1 ) {
slouken@0
  1095
		int i;
slouken@0
  1096
megastep@7
  1097
		for ( i=0; i<num_channels; ++i ) {
slouken@113
  1098
			if ((mix_channel[i].playing > 0) ||
slouken@113
  1099
				(mix_channel[i].looping > 0))
slouken@113
  1100
			{
slouken@0
  1101
				++status;
slouken@0
  1102
			}
slouken@0
  1103
		}
slouken@492
  1104
	} else if ( which < num_channels ) {
slouken@492
  1105
		if ( (mix_channel[which].playing > 0) ||
slouken@492
  1106
		     (mix_channel[which].looping > 0) )
slouken@113
  1107
		{
slouken@0
  1108
			++status;
slouken@0
  1109
		}
slouken@0
  1110
	}
slouken@0
  1111
	return(status);
slouken@0
  1112
}
slouken@0
  1113
slouken@92
  1114
/* rcg06072001 Get the chunk associated with a channel. */
slouken@92
  1115
Mix_Chunk *Mix_GetChunk(int channel)
slouken@92
  1116
{
slouken@92
  1117
	Mix_Chunk *retval = NULL;
slouken@92
  1118
slouken@92
  1119
	if ((channel >= 0) && (channel < num_channels)) {
slouken@92
  1120
		retval = mix_channel[channel].chunk;
slouken@92
  1121
	}
slouken@92
  1122
slouken@92
  1123
	return(retval);
slouken@92
  1124
}
slouken@92
  1125
slouken@0
  1126
/* Close the mixer, halting all playing audio */
slouken@0
  1127
void Mix_CloseAudio(void)
slouken@0
  1128
{
slouken@113
  1129
	int i;
slouken@113
  1130
slouken@0
  1131
	if ( audio_opened ) {
slouken@0
  1132
		if ( audio_opened == 1 ) {
slouken@113
  1133
			for (i = 0; i < num_channels; i++) {
slouken@113
  1134
				Mix_UnregisterAllEffects(i);
slouken@113
  1135
			}
slouken@113
  1136
			Mix_UnregisterAllEffects(MIX_CHANNEL_POST);
slouken@0
  1137
			close_music();
slouken@0
  1138
			Mix_HaltChannel(-1);
icculus@360
  1139
			_Mix_DeinitEffects();
slouken@0
  1140
			SDL_CloseAudio();
slouken@561
  1141
			SDL_free(mix_channel);
slouken@60
  1142
			mix_channel = NULL;
icculus@390
  1143
icculus@390
  1144
			/* rcg06042009 report available decoders at runtime. */
slouken@561
  1145
			SDL_free(chunk_decoders);
icculus@390
  1146
			chunk_decoders = NULL;
icculus@390
  1147
			num_decoders = 0;
slouken@0
  1148
		}
slouken@0
  1149
		--audio_opened;
slouken@0
  1150
	}
slouken@0
  1151
}
slouken@0
  1152
slouken@0
  1153
/* Pause a particular channel (or all) */
slouken@0
  1154
void Mix_Pause(int which)
slouken@0
  1155
{
megastep@8
  1156
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@0
  1157
	if ( which == -1 ) {
slouken@0
  1158
		int i;
slouken@0
  1159
megastep@7
  1160
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1161
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1162
				mix_channel[i].paused = sdl_ticks;
slouken@0
  1163
			}
slouken@0
  1164
		}
slouken@492
  1165
	} else if ( which < num_channels ) {
slouken@60
  1166
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1167
			mix_channel[which].paused = sdl_ticks;
slouken@0
  1168
		}
slouken@0
  1169
	}
slouken@0
  1170
}
slouken@0
  1171
slouken@0
  1172
/* Resume a paused channel */
slouken@0
  1173
void Mix_Resume(int which)
slouken@0
  1174
{
megastep@8
  1175
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@172
  1176
slouken@172
  1177
	SDL_LockAudio();
slouken@0
  1178
	if ( which == -1 ) {
slouken@0
  1179
		int i;
slouken@0
  1180
megastep@7
  1181
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1182
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1183
				if(mix_channel[i].expire > 0)
slouken@60
  1184
					mix_channel[i].expire += sdl_ticks - mix_channel[i].paused;
slouken@60
  1185
				mix_channel[i].paused = 0;
slouken@0
  1186
			}
slouken@0
  1187
		}
slouken@492
  1188
	} else if ( which < num_channels ) {
slouken@60
  1189
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1190
			if(mix_channel[which].expire > 0)
slouken@60
  1191
				mix_channel[which].expire += sdl_ticks - mix_channel[which].paused;
slouken@60
  1192
			mix_channel[which].paused = 0;
slouken@0
  1193
		}
slouken@0
  1194
	}
slouken@172
  1195
	SDL_UnlockAudio();
slouken@0
  1196
}
megastep@7
  1197
megastep@13
  1198
int Mix_Paused(int which)
megastep@13
  1199
{
megastep@14
  1200
	if ( which < 0 ) {
megastep@14
  1201
		int status = 0;
megastep@14
  1202
		int i;
megastep@14
  1203
		for( i=0; i < num_channels; ++i ) {
slouken@60
  1204
			if ( mix_channel[i].paused ) {
megastep@14
  1205
				++ status;
megastep@14
  1206
			}
megastep@14
  1207
		}
megastep@14
  1208
		return(status);
slouken@492
  1209
	} else if ( which < num_channels ) {
slouken@492
  1210
		return(mix_channel[which].paused != 0);
megastep@14
  1211
	} else {
slouken@492
  1212
		return(0);
megastep@14
  1213
	}
megastep@13
  1214
}
megastep@13
  1215
megastep@7
  1216
/* Change the group of a channel */
megastep@7
  1217
int Mix_GroupChannel(int which, int tag)
megastep@7
  1218
{
megastep@7
  1219
	if ( which < 0 || which > num_channels )
megastep@7
  1220
		return(0);
megastep@7
  1221
slouken@172
  1222
	SDL_LockAudio();
slouken@60
  1223
	mix_channel[which].tag = tag;
slouken@172
  1224
	SDL_UnlockAudio();
megastep@7
  1225
	return(1);
megastep@7
  1226
}
megastep@7
  1227
megastep@7
  1228
/* Assign several consecutive channels to a group */
megastep@7
  1229
int Mix_GroupChannels(int from, int to, int tag)
megastep@7
  1230
{
megastep@7
  1231
	int status = 0;
megastep@7
  1232
	for( ; from <= to; ++ from ) {
megastep@7
  1233
		status += Mix_GroupChannel(from, tag);
megastep@7
  1234
	}
megastep@7
  1235
	return(status);
megastep@7
  1236
}
megastep@7
  1237
megastep@7
  1238
/* Finds the first available channel in a group of channels */
megastep@7
  1239
int Mix_GroupAvailable(int tag)
megastep@7
  1240
{
megastep@7
  1241
	int i;
megastep@7
  1242
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1243
		if ( ((tag == -1) || (tag == mix_channel[i].tag)) &&
slouken@60
  1244
		                    (mix_channel[i].playing <= 0) )
megastep@7
  1245
			return i;
megastep@7
  1246
	}
megastep@7
  1247
	return(-1);
megastep@7
  1248
}
megastep@7
  1249
megastep@7
  1250
int Mix_GroupCount(int tag)
megastep@7
  1251
{
megastep@7
  1252
	int count = 0;
megastep@7
  1253
	int i;
megastep@7
  1254
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1255
		if ( mix_channel[i].tag==tag || tag==-1 )
megastep@7
  1256
			++ count;
megastep@7
  1257
	}
megastep@7
  1258
	return(count);
megastep@7
  1259
}
megastep@8
  1260
megastep@8
  1261
/* Finds the "oldest" sample playing in a group of channels */
megastep@8
  1262
int Mix_GroupOldest(int tag)
megastep@8
  1263
{
megastep@8
  1264
	int chan = -1;
megastep@8
  1265
	Uint32 mintime = SDL_GetTicks();
megastep@8
  1266
	int i;
megastep@8
  1267
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1268
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1269
			 && mix_channel[i].start_time <= mintime ) {
slouken@60
  1270
			mintime = mix_channel[i].start_time;
megastep@8
  1271
			chan = i;
megastep@8
  1272
		}
megastep@8
  1273
	}
megastep@8
  1274
	return(chan);
megastep@8
  1275
}
megastep@8
  1276
megastep@8
  1277
/* Finds the "most recent" (i.e. last) sample playing in a group of channels */
megastep@8
  1278
int Mix_GroupNewer(int tag)
megastep@8
  1279
{
megastep@8
  1280
	int chan = -1;
megastep@8
  1281
	Uint32 maxtime = 0;
megastep@8
  1282
	int i;
megastep@8
  1283
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1284
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1285
			 && mix_channel[i].start_time >= maxtime ) {
slouken@60
  1286
			maxtime = mix_channel[i].start_time;
megastep@8
  1287
			chan = i;
megastep@8
  1288
		}
megastep@8
  1289
	}
megastep@8
  1290
	return(chan);
megastep@8
  1291
}
slouken@113
  1292
slouken@113
  1293
slouken@113
  1294
slouken@113
  1295
/*
slouken@113
  1296
 * rcg06122001 The special effects exportable API.
slouken@113
  1297
 *  Please see effect_*.c for internally-implemented effects, such
slouken@113
  1298
 *  as Mix_SetPanning().
slouken@113
  1299
 */
slouken@113
  1300
slouken@164
  1301
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1302
static int _Mix_register_effect(effect_info **e, Mix_EffectFunc_t f,
slouken@164
  1303
				Mix_EffectDone_t d, void *arg)
slouken@113
  1304
{
icculus@512
  1305
	effect_info *new_e;
slouken@113
  1306
slouken@113
  1307
	if (!e) {
slouken@113
  1308
		Mix_SetError("Internal error");
slouken@113
  1309
		return(0);
slouken@113
  1310
	}
slouken@113
  1311
slouken@113
  1312
	if (f == NULL) {
slouken@113
  1313
		Mix_SetError("NULL effect callback");
slouken@113
  1314
		return(0);
slouken@113
  1315
	}
slouken@113
  1316
slouken@561
  1317
	new_e = SDL_malloc(sizeof (effect_info));
slouken@113
  1318
	if (new_e == NULL) {
slouken@113
  1319
		Mix_SetError("Out of memory");
slouken@113
  1320
		return(0);
slouken@113
  1321
	}
slouken@113
  1322
slouken@113
  1323
	new_e->callback = f;
slouken@113
  1324
	new_e->done_callback = d;
slouken@113
  1325
	new_e->udata = arg;
slouken@113
  1326
	new_e->next = NULL;
slouken@113
  1327
slouken@113
  1328
	/* add new effect to end of linked list... */
slouken@113
  1329
	if (*e == NULL) {
slouken@113
  1330
		*e = new_e;
slouken@113
  1331
	} else {
slouken@113
  1332
		effect_info *cur = *e;
slouken@113
  1333
		while (1) {
slouken@113
  1334
			if (cur->next == NULL) {
slouken@113
  1335
				cur->next = new_e;
slouken@113
  1336
				break;
slouken@113
  1337
			}
slouken@113
  1338
			cur = cur->next;
slouken@113
  1339
		}
slouken@113
  1340
	}
slouken@113
  1341
slouken@113
  1342
	return(1);
slouken@113
  1343
}
slouken@113
  1344
slouken@113
  1345
slouken@164
  1346
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1347
static int _Mix_remove_effect(int channel, effect_info **e, Mix_EffectFunc_t f)
slouken@113
  1348
{
slouken@113
  1349
	effect_info *cur;
slouken@113
  1350
	effect_info *prev = NULL;
slouken@113
  1351
	effect_info *next = NULL;
slouken@113
  1352
slouken@113
  1353
	if (!e) {
slouken@113
  1354
		Mix_SetError("Internal error");
slouken@113
  1355
		return(0);
slouken@113
  1356
	}
slouken@113
  1357
slouken@113
  1358
	for (cur = *e; cur != NULL; cur = cur->next) {
slouken@113
  1359
		if (cur->callback == f) {
slouken@113
  1360
			next = cur->next;
slouken@113
  1361
			if (cur->done_callback != NULL) {
slouken@113
  1362
				cur->done_callback(channel, cur->udata);
slouken@113
  1363
			}
slouken@561
  1364
			SDL_free(cur);
slouken@113
  1365
slouken@113
  1366
			if (prev == NULL) {   /* removing first item of list? */
slouken@113
  1367
				*e = next;
slouken@113
  1368
			} else {
slouken@113
  1369
				prev->next = next;
slouken@113
  1370
			}
slouken@113
  1371
			return(1);
slouken@113
  1372
		}
slouken@113
  1373
		prev = cur;
slouken@113
  1374
	}
slouken@113
  1375
slouken@113
  1376
	Mix_SetError("No such effect registered");
slouken@113
  1377
	return(0);
slouken@113
  1378
}
slouken@113
  1379
slouken@113
  1380
slouken@164
  1381
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1382
static int _Mix_remove_all_effects(int channel, effect_info **e)
slouken@113
  1383
{
slouken@113
  1384
	effect_info *cur;
slouken@113
  1385
	effect_info *next;
slouken@113
  1386
slouken@113
  1387
	if (!e) {
slouken@113
  1388
		Mix_SetError("Internal error");
slouken@113
  1389
		return(0);
slouken@113
  1390
	}
slouken@113
  1391
slouken@113
  1392
	for (cur = *e; cur != NULL; cur = next) {
slouken@113
  1393
		next = cur->next;
slouken@113
  1394
		if (cur->done_callback != NULL) {
slouken@113
  1395
			cur->done_callback(channel, cur->udata);
slouken@113
  1396
		}
slouken@561
  1397
		SDL_free(cur);
slouken@113
  1398
	}
slouken@113
  1399
	*e = NULL;
slouken@113
  1400
slouken@113
  1401
	return(1);
slouken@113
  1402
}
slouken@113
  1403
slouken@113
  1404
icculus@442
  1405
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1406
int _Mix_RegisterEffect_locked(int channel, Mix_EffectFunc_t f,
slouken@164
  1407
			Mix_EffectDone_t d, void *arg)
slouken@113
  1408
{
slouken@113
  1409
	effect_info **e = NULL;
slouken@113
  1410
slouken@113
  1411
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1412
		e = &posteffects;
slouken@113
  1413
	} else {
slouken@113
  1414
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1415
			Mix_SetError("Invalid channel number");
slouken@113
  1416
			return(0);
slouken@113
  1417
		}
slouken@113
  1418
		e = &mix_channel[channel].effects;
slouken@113
  1419
	}
slouken@113
  1420
icculus@442
  1421
	return _Mix_register_effect(e, f, d, arg);
slouken@113
  1422
}
slouken@113
  1423
icculus@442
  1424
int Mix_RegisterEffect(int channel, Mix_EffectFunc_t f,
icculus@442
  1425
			Mix_EffectDone_t d, void *arg)
icculus@442
  1426
{
icculus@442
  1427
    int retval;
icculus@442
  1428
	SDL_LockAudio();
icculus@442
  1429
	retval = _Mix_RegisterEffect_locked(channel, f, d, arg);
icculus@442
  1430
	SDL_UnlockAudio();
icculus@442
  1431
    return retval;
icculus@442
  1432
}
slouken@113
  1433
icculus@442
  1434
icculus@442
  1435
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1436
int _Mix_UnregisterEffect_locked(int channel, Mix_EffectFunc_t f)
slouken@113
  1437
{
slouken@113
  1438
	effect_info **e = NULL;
slouken@113
  1439
slouken@113
  1440
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1441
		e = &posteffects;
slouken@113
  1442
	} else {
slouken@113
  1443
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1444
			Mix_SetError("Invalid channel number");
slouken@113
  1445
			return(0);
slouken@113
  1446
		}
slouken@113
  1447
		e = &mix_channel[channel].effects;
slouken@113
  1448
	}
slouken@113
  1449
icculus@442
  1450
	return _Mix_remove_effect(channel, e, f);
icculus@442
  1451
}
icculus@442
  1452
icculus@442
  1453
int Mix_UnregisterEffect(int channel, Mix_EffectFunc_t f)
icculus@442
  1454
{
icculus@442
  1455
	int retval;
slouken@164
  1456
	SDL_LockAudio();
icculus@442
  1457
	retval = _Mix_UnregisterEffect_locked(channel, f);
slouken@164
  1458
	SDL_UnlockAudio();
slouken@164
  1459
	return(retval);
slouken@164
  1460
}
slouken@164
  1461
icculus@442
  1462
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1463
int _Mix_UnregisterAllEffects_locked(int channel)
slouken@164
  1464
{
slouken@164
  1465
	effect_info **e = NULL;
slouken@164
  1466
slouken@164
  1467
	if (channel == MIX_CHANNEL_POST) {
slouken@164
  1468
		e = &posteffects;
slouken@164
  1469
	} else {
slouken@164
  1470
		if ((channel < 0) || (channel >= num_channels)) {
slouken@164
  1471
			Mix_SetError("Invalid channel number");
slouken@164
  1472
			return(0);
slouken@164
  1473
		}
slouken@164
  1474
		e = &mix_channel[channel].effects;
slouken@164
  1475
	}
slouken@164
  1476
icculus@442
  1477
	return _Mix_remove_all_effects(channel, e);
icculus@442
  1478
}
icculus@442
  1479
icculus@442
  1480
int Mix_UnregisterAllEffects(int channel)
icculus@442
  1481
{
icculus@442
  1482
	int retval;
slouken@164
  1483
	SDL_LockAudio();
icculus@442
  1484
	retval = _Mix_UnregisterAllEffects_locked(channel);
slouken@164
  1485
	SDL_UnlockAudio();
slouken@164
  1486
	return(retval);
slouken@113
  1487
}
slouken@113
  1488
slouken@113
  1489
/* end of mixer.c ... */
slouken@113
  1490