mixer.c
author Ozkan Sezer <sezeroz@gmail.com>
Sun, 07 Oct 2018 03:07:33 +0300
branchSDL-1.2
changeset 885 dd251a0ec666
parent 884 4761ad17bdc6
child 887 e49459791ae8
permissions -rw-r--r--
backport fix for bug #2795. (from 2.0 branch commit b28b41b93ba7).
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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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		soundfont_paths=NULL;
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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 SDLCALL 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;
slouken@60
   375
					mix_channel[i].samples = mix_channel[i].chunk->abuf + remaining;
slouken@60
   376
					mix_channel[i].playing = mix_channel[i].chunk->alen - remaining;
slouken@188
   377
					index += remaining;
slouken@45
   378
				}
slouken@60
   379
				if ( ! mix_channel[i].playing && mix_channel[i].looping ) {
slouken@356
   380
					--mix_channel[i].looping;
slouken@356
   381
					mix_channel[i].samples = mix_channel[i].chunk->abuf;
slouken@356
   382
					mix_channel[i].playing = mix_channel[i].chunk->alen;
slouken@0
   383
				}
slouken@0
   384
			}
slouken@0
   385
		}
slouken@0
   386
	}
slouken@113
   387
slouken@113
   388
	/* rcg06122001 run posteffects... */
slouken@113
   389
	Mix_DoEffects(MIX_CHANNEL_POST, stream, len);
slouken@113
   390
slouken@26
   391
	if ( mix_postmix ) {
slouken@26
   392
		mix_postmix(mix_postmix_data, stream, len);
slouken@26
   393
	}
slouken@0
   394
}
slouken@0
   395
slouken@373
   396
#if 0
slouken@0
   397
static void PrintFormat(char *title, SDL_AudioSpec *fmt)
slouken@0
   398
{
slouken@0
   399
	printf("%s: %d bit %s audio (%s) at %u Hz\n", title, (fmt->format&0xFF),
slouken@0
   400
			(fmt->format&0x8000) ? "signed" : "unsigned",
slouken@245
   401
			(fmt->channels > 2) ? "surround" :
slouken@0
   402
			(fmt->channels > 1) ? "stereo" : "mono", fmt->freq);
slouken@0
   403
}
slouken@373
   404
#endif
slouken@0
   405
slouken@113
   406
slouken@0
   407
/* Open the mixer with a certain desired audio format */
slouken@60
   408
int Mix_OpenAudio(int frequency, Uint16 format, int nchannels, int chunksize)
slouken@0
   409
{
slouken@0
   410
	int i;
slouken@0
   411
	SDL_AudioSpec desired;
slouken@0
   412
slouken@0
   413
	/* If the mixer is already opened, increment open count */
slouken@0
   414
	if ( audio_opened ) {
slouken@300
   415
		if ( format == mixer.format && nchannels == mixer.channels ) {
slouken@498
   416
			++audio_opened;
slouken@498
   417
			return(0);
slouken@300
   418
		}
slouken@300
   419
		while ( audio_opened ) {
slouken@300
   420
			Mix_CloseAudio();
slouken@300
   421
		}
slouken@0
   422
	}
slouken@0
   423
slouken@0
   424
	/* Set the desired format and frequency */
slouken@0
   425
	desired.freq = frequency;
slouken@0
   426
	desired.format = format;
slouken@60
   427
	desired.channels = nchannels;
slouken@0
   428
	desired.samples = chunksize;
slouken@0
   429
	desired.callback = mix_channels;
slouken@0
   430
	desired.userdata = NULL;
slouken@0
   431
slouken@0
   432
	/* Accept nearly any audio format */
slouken@0
   433
	if ( SDL_OpenAudio(&desired, &mixer) < 0 ) {
slouken@0
   434
		return(-1);
slouken@0
   435
	}
slouken@0
   436
#if 0
slouken@0
   437
	PrintFormat("Audio device", &mixer);
slouken@0
   438
#endif
slouken@0
   439
slouken@0
   440
	/* Initialize the music players */
slouken@0
   441
	if ( open_music(&mixer) < 0 ) {
slouken@0
   442
		SDL_CloseAudio();
slouken@0
   443
		return(-1);
slouken@0
   444
	}
megastep@7
   445
megastep@7
   446
	num_channels = MIX_CHANNELS;
slouken@561
   447
	mix_channel = (struct _Mix_Channel *) SDL_malloc(num_channels * sizeof(struct _Mix_Channel));
megastep@7
   448
slouken@0
   449
	/* Clear out the audio channels */
megastep@7
   450
	for ( i=0; i<num_channels; ++i ) {
slouken@60
   451
		mix_channel[i].chunk = NULL;
slouken@60
   452
		mix_channel[i].playing = 0;
slouken@60
   453
		mix_channel[i].looping = 0;
slouken@60
   454
		mix_channel[i].volume = SDL_MIX_MAXVOLUME;
slouken@183
   455
		mix_channel[i].fade_volume = SDL_MIX_MAXVOLUME;
icculus@443
   456
		mix_channel[i].fade_volume_reset = SDL_MIX_MAXVOLUME;
slouken@183
   457
		mix_channel[i].fading = MIX_NO_FADING;
slouken@60
   458
		mix_channel[i].tag = -1;
slouken@60
   459
		mix_channel[i].expire = 0;
slouken@113
   460
		mix_channel[i].effects = NULL;
slouken@198
   461
		mix_channel[i].paused = 0;
slouken@0
   462
	}
slouken@0
   463
	Mix_VolumeMusic(SDL_MIX_MAXVOLUME);
slouken@113
   464
slouken@113
   465
	_Mix_InitEffects();
slouken@113
   466
icculus@390
   467
	/* This list is (currently) decided at build time. */
icculus@390
   468
	add_chunk_decoder("WAVE");
icculus@390
   469
	add_chunk_decoder("AIFF");
icculus@390
   470
	add_chunk_decoder("VOC");
icculus@390
   471
#ifdef OGG_MUSIC
icculus@390
   472
	add_chunk_decoder("OGG");
icculus@390
   473
#endif
icculus@390
   474
#ifdef FLAC_MUSIC
icculus@390
   475
	add_chunk_decoder("FLAC");
icculus@390
   476
#endif
icculus@390
   477
slouken@0
   478
	audio_opened = 1;
slouken@0
   479
	SDL_PauseAudio(0);
slouken@0
   480
	return(0);
slouken@0
   481
}
slouken@0
   482
megastep@7
   483
/* Dynamically change the number of channels managed by the mixer.
megastep@7
   484
   If decreasing the number of channels, the upper channels are
megastep@7
   485
   stopped.
megastep@7
   486
 */
megastep@7
   487
int Mix_AllocateChannels(int numchans)
megastep@7
   488
{
megastep@7
   489
	if ( numchans<0 || numchans==num_channels )
megastep@7
   490
		return(num_channels);
megastep@7
   491
megastep@7
   492
	if ( numchans < num_channels ) {
megastep@7
   493
		/* Stop the affected channels */
megastep@7
   494
		int i;
megastep@7
   495
		for(i=numchans; i < num_channels; i++) {
icculus@361
   496
			Mix_UnregisterAllEffects(i);
megastep@7
   497
			Mix_HaltChannel(i);
megastep@7
   498
		}
megastep@7
   499
	}
slouken@172
   500
	SDL_LockAudio();
slouken@561
   501
	mix_channel = (struct _Mix_Channel *) SDL_realloc(mix_channel, numchans * sizeof(struct _Mix_Channel));
megastep@7
   502
	if ( numchans > num_channels ) {
megastep@7
   503
		/* Initialize the new channels */
megastep@7
   504
		int i;
megastep@7
   505
		for(i=num_channels; i < numchans; i++) {
slouken@60
   506
			mix_channel[i].chunk = NULL;
slouken@60
   507
			mix_channel[i].playing = 0;
slouken@60
   508
			mix_channel[i].looping = 0;
slouken@60
   509
			mix_channel[i].volume = SDL_MIX_MAXVOLUME;
slouken@183
   510
			mix_channel[i].fade_volume = SDL_MIX_MAXVOLUME;
icculus@443
   511
			mix_channel[i].fade_volume_reset = SDL_MIX_MAXVOLUME;
slouken@183
   512
			mix_channel[i].fading = MIX_NO_FADING;
slouken@60
   513
			mix_channel[i].tag = -1;
slouken@60
   514
			mix_channel[i].expire = 0;
slouken@113
   515
			mix_channel[i].effects = NULL;
slouken@198
   516
			mix_channel[i].paused = 0;
megastep@7
   517
		}
megastep@7
   518
	}
megastep@7
   519
	num_channels = numchans;
slouken@172
   520
	SDL_UnlockAudio();
megastep@7
   521
	return(num_channels);
megastep@7
   522
}
megastep@7
   523
slouken@0
   524
/* Return the actual mixer parameters */
slouken@0
   525
int Mix_QuerySpec(int *frequency, Uint16 *format, int *channels)
slouken@0
   526
{
slouken@0
   527
	if ( audio_opened ) {
slouken@0
   528
		if ( frequency ) {
slouken@0
   529
			*frequency = mixer.freq;
slouken@0
   530
		}
slouken@0
   531
		if ( format ) {
slouken@0
   532
			*format = mixer.format;
slouken@0
   533
		}
slouken@79
   534
		if ( channels ) {
slouken@0
   535
			*channels = mixer.channels;
slouken@0
   536
		}
slouken@0
   537
	}
slouken@0
   538
	return(audio_opened);
slouken@0
   539
}
slouken@0
   540
slouken@91
   541
slouken@91
   542
/*
slouken@91
   543
 * !!! FIXME: Ideally, we want a Mix_LoadSample_RW(), which will handle the
slouken@91
   544
 *             generic setup, then call the correct file format loader.
slouken@91
   545
 */
slouken@91
   546
slouken@0
   547
/* Load a wave file */
slouken@0
   548
Mix_Chunk *Mix_LoadWAV_RW(SDL_RWops *src, int freesrc)
slouken@0
   549
{
slouken@111
   550
	Uint32 magic;
slouken@0
   551
	Mix_Chunk *chunk;
slouken@111
   552
	SDL_AudioSpec wavespec, *loaded;
slouken@0
   553
	SDL_AudioCVT wavecvt;
slouken@41
   554
	int samplesize;
slouken@0
   555
slouken@91
   556
	/* rcg06012001 Make sure src is valid */
slouken@91
   557
	if ( ! src ) {
slouken@111
   558
		SDL_SetError("Mix_LoadWAV_RW with NULL src");
slouken@91
   559
		return(NULL);
slouken@91
   560
	}
slouken@91
   561
slouken@0
   562
	/* Make sure audio has been opened */
slouken@0
   563
	if ( ! audio_opened ) {
slouken@0
   564
		SDL_SetError("Audio device hasn't been opened");
slouken@89
   565
		if ( freesrc && src ) {
slouken@0
   566
			SDL_RWclose(src);
slouken@0
   567
		}
slouken@0
   568
		return(NULL);
slouken@0
   569
	}
slouken@0
   570
slouken@0
   571
	/* Allocate the chunk memory */
slouken@561
   572
	chunk = (Mix_Chunk *)SDL_malloc(sizeof(Mix_Chunk));
slouken@0
   573
	if ( chunk == NULL ) {
slouken@0
   574
		SDL_SetError("Out of memory");
slouken@0
   575
		if ( freesrc ) {
slouken@0
   576
			SDL_RWclose(src);
slouken@0
   577
		}
slouken@0
   578
		return(NULL);
slouken@0
   579
	}
slouken@0
   580
slouken@111
   581
	/* Find out what kind of audio file this is */
slouken@111
   582
	magic = SDL_ReadLE32(src);
slouken@111
   583
	/* Seek backwards for compatibility with older loaders */
slouken@473
   584
	SDL_RWseek(src, -(int)sizeof(Uint32), RW_SEEK_CUR);
slouken@111
   585
slouken@111
   586
	switch (magic) {
slouken@111
   587
		case WAVE:
slouken@117
   588
		case RIFF:
slouken@111
   589
			loaded = SDL_LoadWAV_RW(src, freesrc, &wavespec,
slouken@111
   590
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@111
   591
			break;
slouken@111
   592
		case FORM:
slouken@111
   593
			loaded = Mix_LoadAIFF_RW(src, freesrc, &wavespec,
slouken@111
   594
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@111
   595
			break;
slouken@190
   596
#ifdef OGG_MUSIC
slouken@190
   597
		case OGGS:
slouken@190
   598
			loaded = Mix_LoadOGG_RW(src, freesrc, &wavespec,
slouken@190
   599
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@190
   600
			break;
slouken@190
   601
#endif
slouken@382
   602
#ifdef FLAC_MUSIC
slouken@382
   603
		case FLAC:
slouken@382
   604
			loaded = Mix_LoadFLAC_RW(src, freesrc, &wavespec,
slouken@382
   605
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@382
   606
			break;
slouken@382
   607
#endif
icculus@191
   608
		case CREA:
slouken@111
   609
			loaded = Mix_LoadVOC_RW(src, freesrc, &wavespec,
slouken@111
   610
					(Uint8 **)&chunk->abuf, &chunk->alen);
slouken@111
   611
			break;
icculus@191
   612
		default:
icculus@191
   613
			SDL_SetError("Unrecognized sound file type");
slouken@584
   614
			if ( freesrc ) {
slouken@584
   615
				SDL_RWclose(src);
slouken@584
   616
			}
slouken@584
   617
			loaded = NULL;
slouken@584
   618
			break;
slouken@111
   619
	}
slouken@111
   620
	if ( !loaded ) {
slouken@584
   621
		/* The individual loaders have closed src if needed */
slouken@561
   622
		SDL_free(chunk);
slouken@0
   623
		return(NULL);
slouken@0
   624
	}
slouken@91
   625
slouken@0
   626
#if 0
slouken@0
   627
	PrintFormat("Audio device", &mixer);
slouken@0
   628
	PrintFormat("-- Wave file", &wavespec);
slouken@0
   629
#endif
slouken@0
   630
slouken@0
   631
	/* Build the audio converter and create conversion buffers */
slouken@560
   632
	if ( wavespec.format != mixer.format ||
slouken@560
   633
		 wavespec.channels != mixer.channels ||
slouken@560
   634
		 wavespec.freq != mixer.freq ) {
slouken@560
   635
		if ( SDL_BuildAudioCVT(&wavecvt,
slouken@560
   636
				wavespec.format, wavespec.channels, wavespec.freq,
slouken@560
   637
				mixer.format, mixer.channels, mixer.freq) < 0 ) {
slouken@561
   638
			SDL_free(chunk->abuf);
slouken@561
   639
			SDL_free(chunk);
slouken@560
   640
			return(NULL);
slouken@560
   641
		}
slouken@560
   642
		samplesize = ((wavespec.format & 0xFF)/8)*wavespec.channels;
slouken@560
   643
		wavecvt.len = chunk->alen & ~(samplesize-1);
slouken@561
   644
		wavecvt.buf = (Uint8 *)SDL_calloc(1, wavecvt.len*wavecvt.len_mult);
slouken@560
   645
		if ( wavecvt.buf == NULL ) {
slouken@560
   646
			SDL_SetError("Out of memory");
slouken@561
   647
			SDL_free(chunk->abuf);
slouken@561
   648
			SDL_free(chunk);
slouken@560
   649
			return(NULL);
slouken@560
   650
		}
slouken@560
   651
		memcpy(wavecvt.buf, chunk->abuf, chunk->alen);
slouken@561
   652
		SDL_free(chunk->abuf);
slouken@560
   653
slouken@560
   654
		/* Run the audio converter */
slouken@560
   655
		if ( SDL_ConvertAudio(&wavecvt) < 0 ) {
slouken@561
   656
			SDL_free(wavecvt.buf);
slouken@561
   657
			SDL_free(chunk);
slouken@560
   658
			return(NULL);
slouken@560
   659
		}
slouken@562
   660
slouken@562
   661
		chunk->abuf = wavecvt.buf;
slouken@562
   662
		chunk->alen = wavecvt.len_cvt;
slouken@0
   663
	}
slouken@0
   664
slouken@1
   665
	chunk->allocated = 1;
slouken@0
   666
	chunk->volume = MIX_MAX_VOLUME;
icculus@516
   667
slouken@0
   668
	return(chunk);
slouken@0
   669
}
slouken@0
   670
slouken@1
   671
/* Load a wave file of the mixer format from a memory buffer */
slouken@1
   672
Mix_Chunk *Mix_QuickLoad_WAV(Uint8 *mem)
slouken@1
   673
{
slouken@1
   674
	Mix_Chunk *chunk;
slouken@1
   675
	Uint8 magic[4];
slouken@1
   676
slouken@1
   677
	/* Make sure audio has been opened */
slouken@1
   678
	if ( ! audio_opened ) {
slouken@1
   679
		SDL_SetError("Audio device hasn't been opened");
slouken@1
   680
		return(NULL);
slouken@1
   681
	}
slouken@1
   682
slouken@1
   683
	/* Allocate the chunk memory */
slouken@561
   684
	chunk = (Mix_Chunk *)SDL_calloc(1,sizeof(Mix_Chunk));
slouken@1
   685
	if ( chunk == NULL ) {
slouken@1
   686
		SDL_SetError("Out of memory");
slouken@1
   687
		return(NULL);
slouken@1
   688
	}
slouken@1
   689
slouken@1
   690
	/* Essentially just skip to the audio data (no error checking - fast) */
slouken@1
   691
	chunk->allocated = 0;
slouken@1
   692
	mem += 12; /* WAV header */
slouken@1
   693
	do {
slouken@1
   694
		memcpy(magic, mem, 4);
slouken@1
   695
		mem += 4;
slouken@1
   696
		chunk->alen = ((mem[3]<<24)|(mem[2]<<16)|(mem[1]<<8)|(mem[0]));
slouken@1
   697
		mem += 4;
slouken@1
   698
		chunk->abuf = mem;
slouken@1
   699
		mem += chunk->alen;
slouken@1
   700
	} while ( memcmp(magic, "data", 4) != 0 );
slouken@1
   701
	chunk->volume = MIX_MAX_VOLUME;
slouken@1
   702
slouken@1
   703
	return(chunk);
slouken@1
   704
}
slouken@1
   705
slouken@174
   706
/* Load raw audio data of the mixer format from a memory buffer */
slouken@174
   707
Mix_Chunk *Mix_QuickLoad_RAW(Uint8 *mem, Uint32 len)
slouken@174
   708
{
slouken@174
   709
	Mix_Chunk *chunk;
slouken@174
   710
slouken@174
   711
	/* Make sure audio has been opened */
slouken@174
   712
	if ( ! audio_opened ) {
slouken@174
   713
		SDL_SetError("Audio device hasn't been opened");
slouken@174
   714
		return(NULL);
slouken@174
   715
	}
slouken@174
   716
slouken@174
   717
	/* Allocate the chunk memory */
slouken@561
   718
	chunk = (Mix_Chunk *)SDL_malloc(sizeof(Mix_Chunk));
slouken@174
   719
	if ( chunk == NULL ) {
slouken@174
   720
		SDL_SetError("Out of memory");
slouken@174
   721
		return(NULL);
slouken@174
   722
	}
slouken@174
   723
slouken@174
   724
	/* Essentially just point at the audio data (no error checking - fast) */
slouken@174
   725
	chunk->allocated = 0;
slouken@174
   726
	chunk->alen = len;
slouken@174
   727
	chunk->abuf = mem;
slouken@174
   728
	chunk->volume = MIX_MAX_VOLUME;
slouken@174
   729
slouken@174
   730
	return(chunk);
slouken@174
   731
}
slouken@174
   732
slouken@0
   733
/* Free an audio chunk previously loaded */
slouken@0
   734
void Mix_FreeChunk(Mix_Chunk *chunk)
slouken@0
   735
{
slouken@0
   736
	int i;
slouken@0
   737
slouken@0
   738
	/* Caution -- if the chunk is playing, the mixer will crash */
slouken@0
   739
	if ( chunk ) {
slouken@0
   740
		/* Guarantee that this chunk isn't playing */
slouken@172
   741
		SDL_LockAudio();
slouken@60
   742
		if ( mix_channel ) {
slouken@60
   743
			for ( i=0; i<num_channels; ++i ) {
slouken@60
   744
				if ( chunk == mix_channel[i].chunk ) {
slouken@60
   745
					mix_channel[i].playing = 0;
icculus@539
   746
					mix_channel[i].looping = 0;
slouken@60
   747
				}
slouken@0
   748
			}
slouken@0
   749
		}
slouken@172
   750
		SDL_UnlockAudio();
slouken@0
   751
		/* Actually free the chunk */
slouken@1
   752
		if ( chunk->allocated ) {
slouken@561
   753
			SDL_free(chunk->abuf);
slouken@1
   754
		}
slouken@561
   755
		SDL_free(chunk);
slouken@0
   756
	}
slouken@0
   757
}
slouken@0
   758
slouken@26
   759
/* Set a function that is called after all mixing is performed.
slouken@26
   760
   This can be used to provide real-time visual display of the audio stream
slouken@26
   761
   or add a custom mixer filter for the stream data.
slouken@26
   762
*/
slouken@26
   763
void Mix_SetPostMix(void (*mix_func)
slouken@26
   764
                    (void *udata, Uint8 *stream, int len), void *arg)
slouken@26
   765
{
slouken@26
   766
	SDL_LockAudio();
slouken@26
   767
	mix_postmix_data = arg;
slouken@26
   768
	mix_postmix = mix_func;
slouken@26
   769
	SDL_UnlockAudio();
slouken@26
   770
}
slouken@26
   771
slouken@0
   772
/* Add your own music player or mixer function.
slouken@0
   773
   If 'mix_func' is NULL, the default music player is re-enabled.
slouken@0
   774
 */
slouken@0
   775
void Mix_HookMusic(void (*mix_func)(void *udata, Uint8 *stream, int len),
slouken@0
   776
                                                                void *arg)
slouken@0
   777
{
slouken@0
   778
	SDL_LockAudio();
slouken@0
   779
	if ( mix_func != NULL ) {
slouken@0
   780
		music_data = arg;
slouken@0
   781
		mix_music = mix_func;
slouken@0
   782
	} else {
slouken@0
   783
		music_data = NULL;
slouken@0
   784
		mix_music = music_mixer;
slouken@0
   785
	}
slouken@0
   786
	SDL_UnlockAudio();
slouken@0
   787
}
slouken@0
   788
slouken@0
   789
void *Mix_GetMusicHookData(void)
slouken@0
   790
{
slouken@0
   791
	return(music_data);
slouken@0
   792
}
slouken@0
   793
slouken@92
   794
void Mix_ChannelFinished(void (*channel_finished)(int channel))
slouken@92
   795
{
slouken@172
   796
	SDL_LockAudio();
slouken@172
   797
	channel_done_callback = channel_finished;
slouken@172
   798
	SDL_UnlockAudio();
slouken@92
   799
}
slouken@92
   800
slouken@92
   801
slouken@0
   802
/* Reserve the first channels (0 -> n-1) for the application, i.e. don't allocate
slouken@0
   803
   them dynamically to the next sample if requested with a -1 value below.
slouken@0
   804
   Returns the number of reserved channels.
slouken@0
   805
 */
slouken@0
   806
int Mix_ReserveChannels(int num)
slouken@0
   807
{
megastep@7
   808
	if (num > num_channels)
megastep@7
   809
		num = num_channels;
slouken@0
   810
	reserved_channels = num;
slouken@0
   811
	return num;
slouken@0
   812
}
slouken@0
   813
slouken@245
   814
static int checkchunkintegral(Mix_Chunk *chunk)
slouken@245
   815
{
slouken@245
   816
	int frame_width = 1;
slouken@245
   817
slouken@245
   818
	if ((mixer.format & 0xFF) == 16) frame_width = 2;
slouken@245
   819
	frame_width *= mixer.channels;
slouken@245
   820
	while (chunk->alen % frame_width) chunk->alen--;
slouken@245
   821
	return chunk->alen;
slouken@245
   822
}
slouken@245
   823
slouken@0
   824
/* Play an audio chunk on a specific channel.
slouken@0
   825
   If the specified channel is -1, play on the first free channel.
megastep@7
   826
   'ticks' is the number of milliseconds at most to play the sample, or -1
megastep@7
   827
   if there is no limit.
slouken@0
   828
   Returns which channel was used to play the sound.
slouken@0
   829
*/
megastep@7
   830
int Mix_PlayChannelTimed(int which, Mix_Chunk *chunk, int loops, int ticks)
slouken@0
   831
{
slouken@0
   832
	int i;
slouken@0
   833
slouken@0
   834
	/* Don't play null pointers :-) */
slouken@0
   835
	if ( chunk == NULL ) {
slouken@178
   836
		Mix_SetError("Tried to play a NULL chunk");
slouken@0
   837
		return(-1);
slouken@0
   838
	}
slouken@245
   839
	if ( !checkchunkintegral(chunk)) {
slouken@245
   840
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   841
		return(-1);
slouken@245
   842
	}
slouken@0
   843
slouken@0
   844
	/* Lock the mixer while modifying the playing channels */
slouken@172
   845
	SDL_LockAudio();
slouken@0
   846
	{
slouken@0
   847
		/* If which is -1, play on the first free channel */
slouken@0
   848
		if ( which == -1 ) {
megastep@7
   849
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   850
				if ( mix_channel[i].playing <= 0 )
slouken@0
   851
					break;
slouken@0
   852
			}
megastep@7
   853
			if ( i == num_channels ) {
slouken@178
   854
				Mix_SetError("No free channels available");
slouken@0
   855
				which = -1;
slouken@0
   856
			} else {
slouken@0
   857
				which = i;
slouken@0
   858
			}
slouken@0
   859
		}
slouken@0
   860
slouken@0
   861
		/* Queue up the audio data for this channel */
slouken@492
   862
		if ( which >= 0 && which < num_channels ) {
slouken@158
   863
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   864
			if (Mix_Playing(which))
slouken@172
   865
				_Mix_channel_done_playing(which);
slouken@60
   866
			mix_channel[which].samples = chunk->abuf;
slouken@60
   867
			mix_channel[which].playing = chunk->alen;
slouken@60
   868
			mix_channel[which].looping = loops;
slouken@60
   869
			mix_channel[which].chunk = chunk;
slouken@60
   870
			mix_channel[which].paused = 0;
slouken@60
   871
			mix_channel[which].fading = MIX_NO_FADING;
slouken@60
   872
			mix_channel[which].start_time = sdl_ticks;
slouken@60
   873
			mix_channel[which].expire = (ticks>0) ? (sdl_ticks + ticks) : 0;
megastep@4
   874
		}
megastep@4
   875
	}
slouken@172
   876
	SDL_UnlockAudio();
megastep@4
   877
megastep@4
   878
	/* Return the channel on which the sound is being played */
megastep@4
   879
	return(which);
megastep@4
   880
}
megastep@4
   881
megastep@7
   882
/* Change the expiration delay for a channel */
megastep@7
   883
int Mix_ExpireChannel(int which, int ticks)
megastep@7
   884
{
megastep@7
   885
	int status = 0;
megastep@7
   886
megastep@7
   887
	if ( which == -1 ) {
megastep@7
   888
		int i;
megastep@7
   889
		for ( i=0; i < num_channels; ++ i ) {
megastep@7
   890
			status += Mix_ExpireChannel(i, ticks);
megastep@7
   891
		}
megastep@7
   892
	} else if ( which < num_channels ) {
slouken@172
   893
		SDL_LockAudio();
slouken@60
   894
		mix_channel[which].expire = (ticks>0) ? (SDL_GetTicks() + ticks) : 0;
slouken@172
   895
		SDL_UnlockAudio();
megastep@7
   896
		++ status;
megastep@7
   897
	}
megastep@7
   898
	return(status);
megastep@7
   899
}
megastep@7
   900
megastep@4
   901
/* Fade in a sound on a channel, over ms milliseconds */
megastep@7
   902
int Mix_FadeInChannelTimed(int which, Mix_Chunk *chunk, int loops, int ms, int ticks)
megastep@4
   903
{
megastep@4
   904
	int i;
megastep@4
   905
megastep@4
   906
	/* Don't play null pointers :-) */
megastep@4
   907
	if ( chunk == NULL ) {
megastep@4
   908
		return(-1);
megastep@4
   909
	}
slouken@245
   910
	if ( !checkchunkintegral(chunk)) {
slouken@245
   911
		Mix_SetError("Tried to play a chunk with a bad frame");
slouken@245
   912
		return(-1);
slouken@245
   913
	}
megastep@4
   914
megastep@4
   915
	/* Lock the mixer while modifying the playing channels */
slouken@172
   916
	SDL_LockAudio();
megastep@4
   917
	{
megastep@4
   918
		/* If which is -1, play on the first free channel */
megastep@4
   919
		if ( which == -1 ) {
megastep@7
   920
			for ( i=reserved_channels; i<num_channels; ++i ) {
slouken@60
   921
				if ( mix_channel[i].playing <= 0 )
megastep@4
   922
					break;
megastep@4
   923
			}
megastep@7
   924
			if ( i == num_channels ) {
megastep@4
   925
				which = -1;
megastep@4
   926
			} else {
megastep@4
   927
				which = i;
megastep@4
   928
			}
megastep@4
   929
		}
megastep@4
   930
megastep@4
   931
		/* Queue up the audio data for this channel */
slouken@492
   932
		if ( which >= 0 && which < num_channels ) {
slouken@158
   933
			Uint32 sdl_ticks = SDL_GetTicks();
slouken@157
   934
			if (Mix_Playing(which))
slouken@172
   935
				_Mix_channel_done_playing(which);
slouken@60
   936
			mix_channel[which].samples = chunk->abuf;
slouken@60
   937
			mix_channel[which].playing = chunk->alen;
slouken@60
   938
			mix_channel[which].looping = loops;
slouken@60
   939
			mix_channel[which].chunk = chunk;
slouken@60
   940
			mix_channel[which].paused = 0;
slouken@60
   941
			mix_channel[which].fading = MIX_FADING_IN;
slouken@60
   942
			mix_channel[which].fade_volume = mix_channel[which].volume;
icculus@444
   943
			mix_channel[which].fade_volume_reset = mix_channel[which].volume;
slouken@60
   944
			mix_channel[which].volume = 0;
slouken@60
   945
			mix_channel[which].fade_length = (Uint32)ms;
slouken@60
   946
			mix_channel[which].start_time = mix_channel[which].ticks_fade = sdl_ticks;
slouken@60
   947
			mix_channel[which].expire = (ticks > 0) ? (sdl_ticks+ticks) : 0;
slouken@0
   948
		}
slouken@0
   949
	}
slouken@172
   950
	SDL_UnlockAudio();
slouken@0
   951
slouken@0
   952
	/* Return the channel on which the sound is being played */
slouken@0
   953
	return(which);
slouken@0
   954
}
slouken@0
   955
slouken@0
   956
/* Set volume of a particular channel */
slouken@0
   957
int Mix_Volume(int which, int volume)
slouken@0
   958
{
slouken@0
   959
	int i;
slouken@492
   960
	int prev_volume = 0;
slouken@0
   961
slouken@0
   962
	if ( which == -1 ) {
megastep@7
   963
		for ( i=0; i<num_channels; ++i ) {
slouken@0
   964
			prev_volume += Mix_Volume(i, volume);
slouken@0
   965
		}
megastep@7
   966
		prev_volume /= num_channels;
slouken@492
   967
	} else if ( which < num_channels ) {
slouken@60
   968
		prev_volume = mix_channel[which].volume;
slouken@163
   969
		if ( volume >= 0 ) {
slouken@163
   970
			if ( volume > SDL_MIX_MAXVOLUME ) {
slouken@163
   971
				volume = SDL_MIX_MAXVOLUME;
slouken@163
   972
			}
slouken@163
   973
			mix_channel[which].volume = volume;
slouken@0
   974
		}
slouken@0
   975
	}
slouken@0
   976
	return(prev_volume);
slouken@0
   977
}
slouken@0
   978
/* Set volume of a particular chunk */
slouken@0
   979
int Mix_VolumeChunk(Mix_Chunk *chunk, int volume)
slouken@0
   980
{
slouken@0
   981
	int prev_volume;
slouken@0
   982
slouken@0
   983
	prev_volume = chunk->volume;
slouken@0
   984
	if ( volume >= 0 ) {
slouken@0
   985
		if ( volume > MIX_MAX_VOLUME ) {
slouken@0
   986
			volume = MIX_MAX_VOLUME;
slouken@0
   987
		}
slouken@0
   988
		chunk->volume = volume;
slouken@0
   989
	}
slouken@0
   990
	return(prev_volume);
slouken@0
   991
}
slouken@0
   992
slouken@0
   993
/* Halt playing of a particular channel */
slouken@0
   994
int Mix_HaltChannel(int which)
slouken@0
   995
{
slouken@0
   996
	int i;
slouken@0
   997
slouken@0
   998
	if ( which == -1 ) {
megastep@7
   999
		for ( i=0; i<num_channels; ++i ) {
slouken@0
  1000
			Mix_HaltChannel(i);
slouken@0
  1001
		}
slouken@492
  1002
	} else if ( which < num_channels ) {
slouken@172
  1003
		SDL_LockAudio();
slouken@113
  1004
		if (mix_channel[which].playing) {
slouken@172
  1005
			_Mix_channel_done_playing(which);
icculus@539
  1006
			mix_channel[which].playing = 0;
icculus@539
  1007
			mix_channel[which].looping = 0;
slouken@113
  1008
		}
slouken@60
  1009
		mix_channel[which].expire = 0;
slouken@60
  1010
		if(mix_channel[which].fading != MIX_NO_FADING) /* Restore volume */
icculus@443
  1011
			mix_channel[which].volume = mix_channel[which].fade_volume_reset;
slouken@60
  1012
		mix_channel[which].fading = MIX_NO_FADING;
slouken@172
  1013
		SDL_UnlockAudio();
slouken@0
  1014
	}
slouken@0
  1015
	return(0);
slouken@0
  1016
}
slouken@0
  1017
megastep@7
  1018
/* Halt playing of a particular group of channels */
megastep@7
  1019
int Mix_HaltGroup(int tag)
megastep@7
  1020
{
megastep@7
  1021
	int i;
megastep@7
  1022
megastep@7
  1023
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1024
		if( mix_channel[i].tag == tag ) {
megastep@7
  1025
			Mix_HaltChannel(i);
megastep@7
  1026
		}
megastep@7
  1027
	}
megastep@7
  1028
	return(0);
megastep@7
  1029
}
megastep@7
  1030
megastep@4
  1031
/* Fade out a channel and then stop it automatically */
megastep@4
  1032
int Mix_FadeOutChannel(int which, int ms)
megastep@4
  1033
{
megastep@4
  1034
	int status;
megastep@4
  1035
megastep@4
  1036
	status = 0;
slouken@89
  1037
	if ( audio_opened ) {
slouken@89
  1038
		if ( which == -1 ) {
slouken@89
  1039
			int i;
megastep@4
  1040
slouken@89
  1041
			for ( i=0; i<num_channels; ++i ) {
slouken@89
  1042
				status += Mix_FadeOutChannel(i, ms);
slouken@89
  1043
			}
slouken@492
  1044
		} else if ( which < num_channels ) {
slouken@172
  1045
			SDL_LockAudio();
slouken@89
  1046
			if ( mix_channel[which].playing && 
slouken@89
  1047
			    (mix_channel[which].volume > 0) &&
slouken@89
  1048
			    (mix_channel[which].fading != MIX_FADING_OUT) ) {
icculus@443
  1049
				mix_channel[which].fade_volume = mix_channel[which].volume;
slouken@89
  1050
				mix_channel[which].fading = MIX_FADING_OUT;
sezeroz@877
  1051
				mix_channel[which].fade_length = (Uint32)ms;
slouken@89
  1052
				mix_channel[which].ticks_fade = SDL_GetTicks();
icculus@443
  1053
icculus@443
  1054
				/* only change fade_volume_reset if we're not fading. */
icculus@443
  1055
				if (mix_channel[which].fading == MIX_NO_FADING) {
icculus@443
  1056
				    mix_channel[which].fade_volume_reset = mix_channel[which].volume;
icculus@443
  1057
				}
slouken@89
  1058
				++status;
slouken@89
  1059
			}
slouken@172
  1060
			SDL_UnlockAudio();
megastep@4
  1061
		}
megastep@4
  1062
	}
megastep@4
  1063
	return(status);
megastep@4
  1064
}
megastep@4
  1065
megastep@7
  1066
/* Halt playing of a particular group of channels */
megastep@7
  1067
int Mix_FadeOutGroup(int tag, int ms)
megastep@7
  1068
{
megastep@7
  1069
	int i;
megastep@7
  1070
	int status = 0;
megastep@7
  1071
	for ( i=0; i<num_channels; ++i ) {
slouken@60
  1072
		if( mix_channel[i].tag == tag ) {
megastep@7
  1073
			status += Mix_FadeOutChannel(i,ms);
megastep@7
  1074
		}
megastep@7
  1075
	}
megastep@7
  1076
	return(status);
megastep@7
  1077
}
megastep@7
  1078
megastep@4
  1079
Mix_Fading Mix_FadingChannel(int which)
megastep@4
  1080
{
slouken@492
  1081
	if ( which < 0 || which >= num_channels ) {
slouken@492
  1082
		return MIX_NO_FADING;
slouken@492
  1083
	}
slouken@60
  1084
	return mix_channel[which].fading;
megastep@4
  1085
}
megastep@4
  1086
slouken@0
  1087
/* Check the status of a specific channel.
slouken@113
  1088
   If the specified mix_channel is -1, check all mix channels.
slouken@0
  1089
*/
slouken@0
  1090
int Mix_Playing(int which)
slouken@0
  1091
{
slouken@0
  1092
	int status;
slouken@0
  1093
slouken@0
  1094
	status = 0;
slouken@0
  1095
	if ( which == -1 ) {
slouken@0
  1096
		int i;
slouken@0
  1097
megastep@7
  1098
		for ( i=0; i<num_channels; ++i ) {
slouken@113
  1099
			if ((mix_channel[i].playing > 0) ||
slouken@113
  1100
				(mix_channel[i].looping > 0))
slouken@113
  1101
			{
slouken@0
  1102
				++status;
slouken@0
  1103
			}
slouken@0
  1104
		}
slouken@492
  1105
	} else if ( which < num_channels ) {
slouken@492
  1106
		if ( (mix_channel[which].playing > 0) ||
slouken@492
  1107
		     (mix_channel[which].looping > 0) )
slouken@113
  1108
		{
slouken@0
  1109
			++status;
slouken@0
  1110
		}
slouken@0
  1111
	}
slouken@0
  1112
	return(status);
slouken@0
  1113
}
slouken@0
  1114
slouken@92
  1115
/* rcg06072001 Get the chunk associated with a channel. */
slouken@92
  1116
Mix_Chunk *Mix_GetChunk(int channel)
slouken@92
  1117
{
slouken@92
  1118
	Mix_Chunk *retval = NULL;
slouken@92
  1119
slouken@92
  1120
	if ((channel >= 0) && (channel < num_channels)) {
slouken@92
  1121
		retval = mix_channel[channel].chunk;
slouken@92
  1122
	}
slouken@92
  1123
slouken@92
  1124
	return(retval);
slouken@92
  1125
}
slouken@92
  1126
slouken@0
  1127
/* Close the mixer, halting all playing audio */
slouken@0
  1128
void Mix_CloseAudio(void)
slouken@0
  1129
{
slouken@113
  1130
	int i;
slouken@113
  1131
slouken@0
  1132
	if ( audio_opened ) {
slouken@0
  1133
		if ( audio_opened == 1 ) {
slouken@113
  1134
			for (i = 0; i < num_channels; i++) {
slouken@113
  1135
				Mix_UnregisterAllEffects(i);
slouken@113
  1136
			}
slouken@113
  1137
			Mix_UnregisterAllEffects(MIX_CHANNEL_POST);
slouken@0
  1138
			close_music();
slouken@0
  1139
			Mix_HaltChannel(-1);
icculus@360
  1140
			_Mix_DeinitEffects();
slouken@0
  1141
			SDL_CloseAudio();
slouken@561
  1142
			SDL_free(mix_channel);
slouken@60
  1143
			mix_channel = NULL;
icculus@390
  1144
icculus@390
  1145
			/* rcg06042009 report available decoders at runtime. */
slouken@561
  1146
			SDL_free(chunk_decoders);
icculus@390
  1147
			chunk_decoders = NULL;
icculus@390
  1148
			num_decoders = 0;
slouken@0
  1149
		}
slouken@0
  1150
		--audio_opened;
slouken@0
  1151
	}
slouken@0
  1152
}
slouken@0
  1153
slouken@0
  1154
/* Pause a particular channel (or all) */
slouken@0
  1155
void Mix_Pause(int which)
slouken@0
  1156
{
megastep@8
  1157
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@0
  1158
	if ( which == -1 ) {
slouken@0
  1159
		int i;
slouken@0
  1160
megastep@7
  1161
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1162
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1163
				mix_channel[i].paused = sdl_ticks;
slouken@0
  1164
			}
slouken@0
  1165
		}
slouken@492
  1166
	} else if ( which < num_channels ) {
slouken@60
  1167
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1168
			mix_channel[which].paused = sdl_ticks;
slouken@0
  1169
		}
slouken@0
  1170
	}
slouken@0
  1171
}
slouken@0
  1172
slouken@0
  1173
/* Resume a paused channel */
slouken@0
  1174
void Mix_Resume(int which)
slouken@0
  1175
{
megastep@8
  1176
	Uint32 sdl_ticks = SDL_GetTicks();
slouken@172
  1177
slouken@172
  1178
	SDL_LockAudio();
slouken@0
  1179
	if ( which == -1 ) {
slouken@0
  1180
		int i;
slouken@0
  1181
megastep@7
  1182
		for ( i=0; i<num_channels; ++i ) {
slouken@60
  1183
			if ( mix_channel[i].playing > 0 ) {
slouken@60
  1184
				if(mix_channel[i].expire > 0)
slouken@60
  1185
					mix_channel[i].expire += sdl_ticks - mix_channel[i].paused;
slouken@60
  1186
				mix_channel[i].paused = 0;
slouken@0
  1187
			}
slouken@0
  1188
		}
slouken@492
  1189
	} else if ( which < num_channels ) {
slouken@60
  1190
		if ( mix_channel[which].playing > 0 ) {
slouken@60
  1191
			if(mix_channel[which].expire > 0)
slouken@60
  1192
				mix_channel[which].expire += sdl_ticks - mix_channel[which].paused;
slouken@60
  1193
			mix_channel[which].paused = 0;
slouken@0
  1194
		}
slouken@0
  1195
	}
slouken@172
  1196
	SDL_UnlockAudio();
slouken@0
  1197
}
megastep@7
  1198
megastep@13
  1199
int Mix_Paused(int which)
megastep@13
  1200
{
megastep@14
  1201
	if ( which < 0 ) {
megastep@14
  1202
		int status = 0;
megastep@14
  1203
		int i;
megastep@14
  1204
		for( i=0; i < num_channels; ++i ) {
slouken@60
  1205
			if ( mix_channel[i].paused ) {
megastep@14
  1206
				++ status;
megastep@14
  1207
			}
megastep@14
  1208
		}
megastep@14
  1209
		return(status);
slouken@492
  1210
	} else if ( which < num_channels ) {
slouken@492
  1211
		return(mix_channel[which].paused != 0);
megastep@14
  1212
	} else {
slouken@492
  1213
		return(0);
megastep@14
  1214
	}
megastep@13
  1215
}
megastep@13
  1216
megastep@7
  1217
/* Change the group of a channel */
megastep@7
  1218
int Mix_GroupChannel(int which, int tag)
megastep@7
  1219
{
megastep@7
  1220
	if ( which < 0 || which > num_channels )
megastep@7
  1221
		return(0);
megastep@7
  1222
slouken@172
  1223
	SDL_LockAudio();
slouken@60
  1224
	mix_channel[which].tag = tag;
slouken@172
  1225
	SDL_UnlockAudio();
megastep@7
  1226
	return(1);
megastep@7
  1227
}
megastep@7
  1228
megastep@7
  1229
/* Assign several consecutive channels to a group */
megastep@7
  1230
int Mix_GroupChannels(int from, int to, int tag)
megastep@7
  1231
{
megastep@7
  1232
	int status = 0;
megastep@7
  1233
	for( ; from <= to; ++ from ) {
megastep@7
  1234
		status += Mix_GroupChannel(from, tag);
megastep@7
  1235
	}
megastep@7
  1236
	return(status);
megastep@7
  1237
}
megastep@7
  1238
megastep@7
  1239
/* Finds the first available channel in a group of channels */
megastep@7
  1240
int Mix_GroupAvailable(int tag)
megastep@7
  1241
{
megastep@7
  1242
	int i;
megastep@7
  1243
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1244
		if ( ((tag == -1) || (tag == mix_channel[i].tag)) &&
slouken@60
  1245
		                    (mix_channel[i].playing <= 0) )
megastep@7
  1246
			return i;
megastep@7
  1247
	}
megastep@7
  1248
	return(-1);
megastep@7
  1249
}
megastep@7
  1250
megastep@7
  1251
int Mix_GroupCount(int tag)
megastep@7
  1252
{
megastep@7
  1253
	int count = 0;
megastep@7
  1254
	int i;
megastep@7
  1255
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1256
		if ( mix_channel[i].tag==tag || tag==-1 )
megastep@7
  1257
			++ count;
megastep@7
  1258
	}
megastep@7
  1259
	return(count);
megastep@7
  1260
}
megastep@8
  1261
megastep@8
  1262
/* Finds the "oldest" sample playing in a group of channels */
megastep@8
  1263
int Mix_GroupOldest(int tag)
megastep@8
  1264
{
megastep@8
  1265
	int chan = -1;
megastep@8
  1266
	Uint32 mintime = SDL_GetTicks();
megastep@8
  1267
	int i;
megastep@8
  1268
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1269
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1270
			 && mix_channel[i].start_time <= mintime ) {
slouken@60
  1271
			mintime = mix_channel[i].start_time;
megastep@8
  1272
			chan = i;
megastep@8
  1273
		}
megastep@8
  1274
	}
megastep@8
  1275
	return(chan);
megastep@8
  1276
}
megastep@8
  1277
megastep@8
  1278
/* Finds the "most recent" (i.e. last) sample playing in a group of channels */
megastep@8
  1279
int Mix_GroupNewer(int tag)
megastep@8
  1280
{
megastep@8
  1281
	int chan = -1;
megastep@8
  1282
	Uint32 maxtime = 0;
megastep@8
  1283
	int i;
megastep@8
  1284
	for( i=0; i < num_channels; i ++ ) {
slouken@60
  1285
		if ( (mix_channel[i].tag==tag || tag==-1) && mix_channel[i].playing > 0
slouken@60
  1286
			 && mix_channel[i].start_time >= maxtime ) {
slouken@60
  1287
			maxtime = mix_channel[i].start_time;
megastep@8
  1288
			chan = i;
megastep@8
  1289
		}
megastep@8
  1290
	}
megastep@8
  1291
	return(chan);
megastep@8
  1292
}
slouken@113
  1293
slouken@113
  1294
slouken@113
  1295
slouken@113
  1296
/*
slouken@113
  1297
 * rcg06122001 The special effects exportable API.
slouken@113
  1298
 *  Please see effect_*.c for internally-implemented effects, such
slouken@113
  1299
 *  as Mix_SetPanning().
slouken@113
  1300
 */
slouken@113
  1301
slouken@164
  1302
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1303
static int _Mix_register_effect(effect_info **e, Mix_EffectFunc_t f,
slouken@164
  1304
				Mix_EffectDone_t d, void *arg)
slouken@113
  1305
{
icculus@512
  1306
	effect_info *new_e;
slouken@113
  1307
slouken@113
  1308
	if (!e) {
slouken@113
  1309
		Mix_SetError("Internal error");
slouken@113
  1310
		return(0);
slouken@113
  1311
	}
slouken@113
  1312
slouken@113
  1313
	if (f == NULL) {
slouken@113
  1314
		Mix_SetError("NULL effect callback");
slouken@113
  1315
		return(0);
slouken@113
  1316
	}
slouken@113
  1317
slouken@561
  1318
	new_e = SDL_malloc(sizeof (effect_info));
slouken@113
  1319
	if (new_e == NULL) {
slouken@113
  1320
		Mix_SetError("Out of memory");
slouken@113
  1321
		return(0);
slouken@113
  1322
	}
slouken@113
  1323
slouken@113
  1324
	new_e->callback = f;
slouken@113
  1325
	new_e->done_callback = d;
slouken@113
  1326
	new_e->udata = arg;
slouken@113
  1327
	new_e->next = NULL;
slouken@113
  1328
slouken@113
  1329
	/* add new effect to end of linked list... */
slouken@113
  1330
	if (*e == NULL) {
slouken@113
  1331
		*e = new_e;
slouken@113
  1332
	} else {
slouken@113
  1333
		effect_info *cur = *e;
slouken@113
  1334
		while (1) {
slouken@113
  1335
			if (cur->next == NULL) {
slouken@113
  1336
				cur->next = new_e;
slouken@113
  1337
				break;
slouken@113
  1338
			}
slouken@113
  1339
			cur = cur->next;
slouken@113
  1340
		}
slouken@113
  1341
	}
slouken@113
  1342
slouken@113
  1343
	return(1);
slouken@113
  1344
}
slouken@113
  1345
slouken@113
  1346
slouken@164
  1347
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1348
static int _Mix_remove_effect(int channel, effect_info **e, Mix_EffectFunc_t f)
slouken@113
  1349
{
slouken@113
  1350
	effect_info *cur;
slouken@113
  1351
	effect_info *prev = NULL;
slouken@113
  1352
	effect_info *next = NULL;
slouken@113
  1353
slouken@113
  1354
	if (!e) {
slouken@113
  1355
		Mix_SetError("Internal error");
slouken@113
  1356
		return(0);
slouken@113
  1357
	}
slouken@113
  1358
slouken@113
  1359
	for (cur = *e; cur != NULL; cur = cur->next) {
slouken@113
  1360
		if (cur->callback == f) {
slouken@113
  1361
			next = cur->next;
slouken@113
  1362
			if (cur->done_callback != NULL) {
slouken@113
  1363
				cur->done_callback(channel, cur->udata);
slouken@113
  1364
			}
slouken@561
  1365
			SDL_free(cur);
slouken@113
  1366
slouken@113
  1367
			if (prev == NULL) {   /* removing first item of list? */
slouken@113
  1368
				*e = next;
slouken@113
  1369
			} else {
slouken@113
  1370
				prev->next = next;
slouken@113
  1371
			}
slouken@113
  1372
			return(1);
slouken@113
  1373
		}
slouken@113
  1374
		prev = cur;
slouken@113
  1375
	}
slouken@113
  1376
slouken@113
  1377
	Mix_SetError("No such effect registered");
slouken@113
  1378
	return(0);
slouken@113
  1379
}
slouken@113
  1380
slouken@113
  1381
slouken@164
  1382
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
slouken@113
  1383
static int _Mix_remove_all_effects(int channel, effect_info **e)
slouken@113
  1384
{
slouken@113
  1385
	effect_info *cur;
slouken@113
  1386
	effect_info *next;
slouken@113
  1387
slouken@113
  1388
	if (!e) {
slouken@113
  1389
		Mix_SetError("Internal error");
slouken@113
  1390
		return(0);
slouken@113
  1391
	}
slouken@113
  1392
slouken@113
  1393
	for (cur = *e; cur != NULL; cur = next) {
slouken@113
  1394
		next = cur->next;
slouken@113
  1395
		if (cur->done_callback != NULL) {
slouken@113
  1396
			cur->done_callback(channel, cur->udata);
slouken@113
  1397
		}
slouken@561
  1398
		SDL_free(cur);
slouken@113
  1399
	}
slouken@113
  1400
	*e = NULL;
slouken@113
  1401
slouken@113
  1402
	return(1);
slouken@113
  1403
}
slouken@113
  1404
slouken@113
  1405
icculus@442
  1406
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1407
int _Mix_RegisterEffect_locked(int channel, Mix_EffectFunc_t f,
slouken@164
  1408
			Mix_EffectDone_t d, void *arg)
slouken@113
  1409
{
slouken@113
  1410
	effect_info **e = NULL;
slouken@113
  1411
slouken@113
  1412
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1413
		e = &posteffects;
slouken@113
  1414
	} else {
slouken@113
  1415
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1416
			Mix_SetError("Invalid channel number");
slouken@113
  1417
			return(0);
slouken@113
  1418
		}
slouken@113
  1419
		e = &mix_channel[channel].effects;
slouken@113
  1420
	}
slouken@113
  1421
icculus@442
  1422
	return _Mix_register_effect(e, f, d, arg);
slouken@113
  1423
}
slouken@113
  1424
icculus@442
  1425
int Mix_RegisterEffect(int channel, Mix_EffectFunc_t f,
icculus@442
  1426
			Mix_EffectDone_t d, void *arg)
icculus@442
  1427
{
icculus@442
  1428
    int retval;
icculus@442
  1429
	SDL_LockAudio();
icculus@442
  1430
	retval = _Mix_RegisterEffect_locked(channel, f, d, arg);
icculus@442
  1431
	SDL_UnlockAudio();
icculus@442
  1432
    return retval;
icculus@442
  1433
}
slouken@113
  1434
icculus@442
  1435
icculus@442
  1436
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1437
int _Mix_UnregisterEffect_locked(int channel, Mix_EffectFunc_t f)
slouken@113
  1438
{
slouken@113
  1439
	effect_info **e = NULL;
slouken@113
  1440
slouken@113
  1441
	if (channel == MIX_CHANNEL_POST) {
slouken@113
  1442
		e = &posteffects;
slouken@113
  1443
	} else {
slouken@113
  1444
		if ((channel < 0) || (channel >= num_channels)) {
slouken@113
  1445
			Mix_SetError("Invalid channel number");
slouken@113
  1446
			return(0);
slouken@113
  1447
		}
slouken@113
  1448
		e = &mix_channel[channel].effects;
slouken@113
  1449
	}
slouken@113
  1450
icculus@442
  1451
	return _Mix_remove_effect(channel, e, f);
icculus@442
  1452
}
icculus@442
  1453
icculus@442
  1454
int Mix_UnregisterEffect(int channel, Mix_EffectFunc_t f)
icculus@442
  1455
{
icculus@442
  1456
	int retval;
slouken@164
  1457
	SDL_LockAudio();
icculus@442
  1458
	retval = _Mix_UnregisterEffect_locked(channel, f);
slouken@164
  1459
	SDL_UnlockAudio();
slouken@164
  1460
	return(retval);
slouken@164
  1461
}
slouken@164
  1462
icculus@442
  1463
/* MAKE SURE you hold the audio lock (SDL_LockAudio()) before calling this! */
icculus@442
  1464
int _Mix_UnregisterAllEffects_locked(int channel)
slouken@164
  1465
{
slouken@164
  1466
	effect_info **e = NULL;
slouken@164
  1467
slouken@164
  1468
	if (channel == MIX_CHANNEL_POST) {
slouken@164
  1469
		e = &posteffects;
slouken@164
  1470
	} else {
slouken@164
  1471
		if ((channel < 0) || (channel >= num_channels)) {
slouken@164
  1472
			Mix_SetError("Invalid channel number");
slouken@164
  1473
			return(0);
slouken@164
  1474
		}
slouken@164
  1475
		e = &mix_channel[channel].effects;
slouken@164
  1476
	}
slouken@164
  1477
icculus@442
  1478
	return _Mix_remove_all_effects(channel, e);
icculus@442
  1479
}
icculus@442
  1480
icculus@442
  1481
int Mix_UnregisterAllEffects(int channel)
icculus@442
  1482
{
icculus@442
  1483
	int retval;
slouken@164
  1484
	SDL_LockAudio();
icculus@442
  1485
	retval = _Mix_UnregisterAllEffects_locked(channel);
slouken@164
  1486
	SDL_UnlockAudio();
slouken@164
  1487
	return(retval);
slouken@113
  1488
}
slouken@113
  1489
slouken@113
  1490
/* end of mixer.c ... */
slouken@113
  1491