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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2004 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef SOUND_MIXER_H
#define SOUND_MIXER_H
#include "stdafx.h"
#include "common/scummsys.h"
#include "common/system.h"
class AudioStream;
class Channel;
class File;
class PlayingSoundHandle {
friend class Channel;
friend class SoundMixer;
int val;
int getIndex() const { return val - 1; }
void setIndex(int i) { val = i + 1; }
void resetIndex() { val = 0; }
public:
PlayingSoundHandle() { resetIndex(); }
bool isActive() const { return val > 0; }
};
class SoundMixer {
public:
typedef void PremixProc (void *param, int16 *data, uint len);
enum {
NUM_CHANNELS = 16
};
enum {
FLAG_UNSIGNED = 1 << 0, /** unsigned samples (default: signed) */
FLAG_16BITS = 1 << 1, /** sound is 16 bits wide (default: 8bit) */
FLAG_LITTLE_ENDIAN = 1 << 2, /** sample is little endian (default: big endian) */
FLAG_STEREO = 1 << 3, /** sound is in stereo (default: mono) */
FLAG_REVERSE_STEREO = 1 << 4, /** reverse the left and right stereo channel */
FLAG_AUTOFREE = 1 << 5, /** sound buffer is freed automagically at the end of playing */
FLAG_LOOP = 1 << 6 /** loop the audio */
};
private:
OSystem *_syst;
OSystem::MutexRef _mutex;
void *_premixParam;
PremixProc *_premixProc;
uint _outputRate;
int _globalVolume;
int _musicVolume;
bool _paused;
Channel *_channels[NUM_CHANNELS];
bool _mixerReady;
public:
SoundMixer();
~SoundMixer();
/**
* Is the mixer ready and setup? This may not be the case on systems which
* don't support digital sound output. In that case, the mixer proc may
* never be called. That in turn can cause breakage in games which use the
* premix callback for syncing. In particular, the Adlib MIDI emulation...
*/
bool isReady() const { return _mixerReady; };
/**
* Set the premix procedure. This is mainly used for the adlib music, but
* is not limited to it. The premix proc is invoked by the mixer whenever
* it needs to generate any data, before any other mixing takes place. The
* premixer than has a chanve to fill the mix buffer with data (usually
* music samples). It should generate the specified number of 16bit stereo
* samples (i.e. len * 4 bytes). The endianness of these samples shall be
* the native endianness.
*/
void setupPremix(PremixProc *proc, void *param);
// start playing a raw sound
void playRaw(PlayingSoundHandle *handle, void *sound, uint32 size, uint rate, byte flags,
int id = -1, byte volume = 255, int8 balance = 0, uint32 loopStart = 0, uint32 loopEnd = 0);
#ifdef USE_MAD
void playMP3(PlayingSoundHandle *handle, File *file, uint32 size, byte volume = 255, int8 balance = 0, int id = -1);
#endif
#ifdef USE_VORBIS
void playVorbis(PlayingSoundHandle *handle, File *file, uint32 size, byte volume = 255, int8 balance = 0, int id = -1);
#endif
#ifdef USE_FLAC
void playFlac(PlayingSoundHandle *handle, File *file, uint32 size, byte volume = 255, int8 balance = 0, int id = -1);
#endif
void playInputStream(PlayingSoundHandle *handle, AudioStream *input, bool isMusic, byte volume = 255, int8 balance = 0, int id = -1, bool autofreeStream = true);
/** Start a new stream. */
void newStream(PlayingSoundHandle *handle, uint rate, byte flags, uint32 buffer_size, byte volume = 255, int8 balance = 0);
/** Append to an existing stream. */
void appendStream(PlayingSoundHandle handle, void *sound, uint32 size);
/**
* Mark a stream as finished.
* Where stopHandle() would stop the sound immediately, when using this
* method, the stream will first finish playing all its data before it
* finally stops.
*/
void endStream(PlayingSoundHandle handle);
/** stop all currently playing sounds */
void stopAll();
/** stop playing the sound with given ID */
void stopID(int id);
/** stop playing the channel for the given handle */
void stopHandle(PlayingSoundHandle handle);
/** pause/unpause all channels */
void pauseAll(bool paused);
/** check if mixer is paused */
bool isPaused();
/** pause/unpause the sound with the given ID */
void pauseID(int id, bool paused);
/** pause/unpause the channel for the given handle */
void pauseHandle(PlayingSoundHandle handle, bool paused);
/** set the channel volume for the given handle (0 - 255) */
void setChannelVolume(PlayingSoundHandle handle, byte volume);
/** set the channel balance for the given handle (-127 ... 0 ... 127) (left ... center ... right)*/
void setChannelBalance(PlayingSoundHandle handle, int8 balance);
/** get approximation of for how long the channel has been playing */
uint32 getChannelElapsedTime(PlayingSoundHandle handle);
/** Check whether any SFX channel is active.*/
bool hasActiveSFXChannel();
/** set the global volume, 0-256 */
void setVolume(int volume);
/** query the global volume, 0-256 */
int getVolume() const { return _globalVolume; }
/** set the music volume, 0-256 */
void setMusicVolume(int volume);
/** query the music volume, 0-256 */
int getMusicVolume() const { return _musicVolume; }
/** query the output rate in kHz */
uint getOutputRate() const { return _outputRate; }
private:
void insertChannel(PlayingSoundHandle *handle, Channel *chan);
/** main mixer method */
void mix(int16 * buf, uint len);
static void mixCallback(void *s, byte *samples, int len);
};
#endif
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