forked from KolibriOS/kolibrios
236 lines
8.6 KiB
C
Executable File
236 lines
8.6 KiB
C
Executable File
/*
|
|
MIXERLIB: An audio mixer library based on the SDL library
|
|
Copyright (C) 1997-1999 Sam Lantinga
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with this library; if not, write to the Free
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
Sam Lantinga
|
|
5635-34 Springhouse Dr.
|
|
Pleasanton, CA 94588 (USA)
|
|
slouken@devolution.com
|
|
*/
|
|
|
|
#ifndef _MIXER_H_
|
|
#define _MIXER_H_
|
|
|
|
#include "SDL_types.h"
|
|
#include "SDL_rwops.h"
|
|
#include "SDL_audio.h"
|
|
#include "SDL_byteorder.h"
|
|
#include "begin_code.h"
|
|
|
|
/* Set up for C function definitions, even when using C++ */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* The default mixer has 8 simultaneous mixing channels */
|
|
#ifndef MIX_CHANNELS
|
|
#define MIX_CHANNELS 8
|
|
#endif
|
|
|
|
/* Good default values for a PC soundcard */
|
|
#define MIX_DEFAULT_FREQUENCY 22050
|
|
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
|
|
#define MIX_DEFAULT_FORMAT AUDIO_S16LSB
|
|
#else
|
|
#define MIX_DEFAULT_FORMAT AUDIO_S16MSB
|
|
#endif
|
|
#define MIX_DEFAULT_CHANNELS 2
|
|
#define MIX_MAX_VOLUME 128 /* Volume of a chunk */
|
|
|
|
/* The internal format for an audio chunk */
|
|
typedef struct {
|
|
int allocated;
|
|
Uint8 *abuf;
|
|
Uint32 alen;
|
|
Uint8 volume; /* Per-sample volume, 0-128 */
|
|
} Mix_Chunk;
|
|
|
|
/* The different fading types supported */
|
|
typedef enum {
|
|
MIX_NO_FADING,
|
|
MIX_FADING_OUT,
|
|
MIX_FADING_IN
|
|
} Mix_Fading;
|
|
|
|
/* The internal format for a music chunk interpreted via mikmod */
|
|
typedef struct _Mix_Music Mix_Music;
|
|
|
|
/* Open the mixer with a certain audio format */
|
|
extern DECLSPEC int Mix_OpenAudio(int frequency, Uint16 format, int channels,
|
|
int chunksize);
|
|
|
|
/* Dynamically change the number of channels managed by the mixer.
|
|
If decreasing the number of channels, the upper channels are
|
|
stopped.
|
|
This function returns the new number of allocated channels.
|
|
*/
|
|
extern DECLSPEC int Mix_AllocateChannels(int numchans);
|
|
|
|
/* Find out what the actual audio device parameters are.
|
|
This function returns 1 if the audio has been opened, 0 otherwise.
|
|
*/
|
|
extern DECLSPEC int Mix_QuerySpec(int *frequency,Uint16 *format,int *channels);
|
|
|
|
/* Load a wave file or a music (.mod .s3m .it .xm) file */
|
|
extern DECLSPEC Mix_Chunk *Mix_LoadWAV_RW(SDL_RWops *src, int freesrc);
|
|
#define Mix_LoadWAV(file) Mix_LoadWAV_RW(SDL_RWFromFile(file, "rb"), 1)
|
|
extern DECLSPEC Mix_Music *Mix_LoadMUS(const char *file);
|
|
|
|
#if 0 /* This hasn't been hooked into music.c yet */
|
|
/* Load a music file from an SDL_RWop object (MikMod-specific currently)
|
|
Matt Campbell (matt@campbellhome.dhs.org) April 2000 */
|
|
extern DECLSPEC Mix_Music *Mix_LoadMUS_RW(SDL_RWops *rw);
|
|
#endif
|
|
|
|
/* Load a wave file of the mixer format from a memory buffer */
|
|
extern DECLSPEC Mix_Chunk *Mix_QuickLoad_WAV(Uint8 *mem);
|
|
|
|
/* Free an audio chunk previously loaded */
|
|
extern DECLSPEC void Mix_FreeChunk(Mix_Chunk *chunk);
|
|
extern DECLSPEC void Mix_FreeMusic(Mix_Music *music);
|
|
|
|
/* Set a function that is called after all mixing is performed.
|
|
This can be used to provide real-time visual display of the audio stream
|
|
or add a custom mixer filter for the stream data.
|
|
*/
|
|
extern DECLSPEC void Mix_SetPostMix(void (*mix_func)
|
|
(void *udata, Uint8 *stream, int len), void *arg);
|
|
|
|
/* Add your own music player or additional mixer function.
|
|
If 'mix_func' is NULL, the default music player is re-enabled.
|
|
*/
|
|
extern DECLSPEC void Mix_HookMusic(void (*mix_func)
|
|
(void *udata, Uint8 *stream, int len), void *arg);
|
|
|
|
/* Add your own callback when the music has finished playing.
|
|
*/
|
|
extern DECLSPEC void Mix_HookMusicFinished(void (*music_finished)(void));
|
|
|
|
/* Get a pointer to the user data for the current music hook */
|
|
extern DECLSPEC void *Mix_GetMusicHookData(void);
|
|
|
|
/* Reserve the first channels (0 -> n-1) for the application, i.e. don't allocate
|
|
them dynamically to the next sample if requested with a -1 value below.
|
|
Returns the number of reserved channels.
|
|
*/
|
|
extern DECLSPEC int Mix_ReserveChannels(int num);
|
|
|
|
/* Channel grouping functions */
|
|
|
|
/* Attach a tag to a channel. A tag can be assigned to several mixer
|
|
channels, to form groups of channels.
|
|
If 'tag' is -1, the tag is removed (actually -1 is the tag used to
|
|
represent the group of all the channels).
|
|
Returns true if everything was OK.
|
|
*/
|
|
extern DECLSPEC int Mix_GroupChannel(int which, int tag);
|
|
/* Assign several consecutive channels to a group */
|
|
extern DECLSPEC int Mix_GroupChannels(int from, int to, int tag);
|
|
/* Finds the first available channel in a group of channels */
|
|
extern DECLSPEC int Mix_GroupAvailable(int tag);
|
|
/* Returns the number of channels in a group. This is also a subtle
|
|
way to get the total number of channels when 'tag' is -1
|
|
*/
|
|
extern DECLSPEC int Mix_GroupCount(int tag);
|
|
/* Finds the "oldest" sample playing in a group of channels */
|
|
extern DECLSPEC int Mix_GroupOldest(int tag);
|
|
/* Finds the "most recent" (i.e. last) sample playing in a group of channels */
|
|
extern DECLSPEC int Mix_GroupNewer(int tag);
|
|
|
|
/* Play an audio chunk on a specific channel.
|
|
If the specified channel is -1, play on the first free channel.
|
|
If 'loops' is greater than zero, loop the sound that many times.
|
|
If 'loops' is -1, loop inifinitely (~65000 times).
|
|
Returns which channel was used to play the sound.
|
|
*/
|
|
#define Mix_PlayChannel(channel,chunk,loops) Mix_PlayChannelTimed(channel,chunk,loops,-1)
|
|
/* The same as above, but the sound is played at most 'ticks' milliseconds */
|
|
extern DECLSPEC int Mix_PlayChannelTimed(int channel, Mix_Chunk *chunk, int loops, int ticks);
|
|
extern DECLSPEC int Mix_PlayMusic(Mix_Music *music, int loops);
|
|
|
|
/* Fade in music or a channel over "ms" milliseconds, same semantics as the "Play" functions */
|
|
extern DECLSPEC int Mix_FadeInMusic(Mix_Music *music, int loops, int ms);
|
|
#define Mix_FadeInChannel(channel,chunk,loops,ms) Mix_FadeInChannelTimed(channel,chunk,loops,ms,-1)
|
|
extern DECLSPEC int Mix_FadeInChannelTimed(int channel, Mix_Chunk *chunk, int loops, int ms, int ticks);
|
|
|
|
/* Set the volume in the range of 0-128 of a specific channel or chunk.
|
|
If the specified channel is -1, set volume for all channels.
|
|
Returns the original volume.
|
|
If the specified volume is -1, just return the current volume.
|
|
*/
|
|
extern DECLSPEC int Mix_Volume(int channel, int volume);
|
|
extern DECLSPEC int Mix_VolumeChunk(Mix_Chunk *chunk, int volume);
|
|
extern DECLSPEC int Mix_VolumeMusic(int volume);
|
|
|
|
/* Halt playing of a particular channel */
|
|
extern DECLSPEC int Mix_HaltChannel(int channel);
|
|
extern DECLSPEC int Mix_HaltGroup(int tag);
|
|
extern DECLSPEC int Mix_HaltMusic(void);
|
|
|
|
/* Change the expiration delay for a particular channel.
|
|
The sample will stop playing after the 'ticks' milliseconds have elapsed,
|
|
or remove the expiration if 'ticks' is -1
|
|
*/
|
|
extern DECLSPEC int Mix_ExpireChannel(int channel, int ticks);
|
|
|
|
/* Halt a channel, fading it out progressively till it's silent
|
|
The ms parameter indicates the number of milliseconds the fading
|
|
will take.
|
|
*/
|
|
extern DECLSPEC int Mix_FadeOutChannel(int which, int ms);
|
|
extern DECLSPEC int Mix_FadeOutGroup(int tag, int ms);
|
|
extern DECLSPEC int Mix_FadeOutMusic(int ms);
|
|
|
|
/* Query the fading status of a channel */
|
|
extern DECLSPEC Mix_Fading Mix_FadingMusic(void);
|
|
extern DECLSPEC Mix_Fading Mix_FadingChannel(int which);
|
|
|
|
/* Pause/Resume a particular channel */
|
|
extern DECLSPEC void Mix_Pause(int channel);
|
|
extern DECLSPEC void Mix_Resume(int channel);
|
|
extern DECLSPEC int Mix_Paused(int channel);
|
|
|
|
/* Pause/Resume the music stream */
|
|
extern DECLSPEC void Mix_PauseMusic(void);
|
|
extern DECLSPEC void Mix_ResumeMusic(void);
|
|
extern DECLSPEC void Mix_RewindMusic(void);
|
|
extern DECLSPEC int Mix_PausedMusic(void);
|
|
|
|
/* Check the status of a specific channel.
|
|
If the specified channel is -1, check all channels.
|
|
*/
|
|
extern DECLSPEC int Mix_Playing(int channel);
|
|
extern DECLSPEC int Mix_PlayingMusic(void);
|
|
|
|
/* Stop music and set external music playback command */
|
|
extern DECLSPEC int Mix_SetMusicCMD(const char *command);
|
|
|
|
/* Close the mixer, halting all playing audio */
|
|
extern DECLSPEC void Mix_CloseAudio(void);
|
|
|
|
/* We'll use SDL for reporting errors */
|
|
#define Mix_SetError SDL_SetError
|
|
#define Mix_GetError SDL_GetError
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include "close_code.h"
|
|
|
|
#endif /* _MIXER_H_ */
|