1 /* ScummVM - Graphic Adventure Engine 2 * 3 * ScummVM is the legal property of its developers, whose names 4 * are too numerous to list here. Please refer to the COPYRIGHT 5 * file distributed with this source distribution. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef BLADERUNNER_AUDIO_MIXER_H 24 #define BLADERUNNER_AUDIO_MIXER_H 25 26 #include "audio/audiostream.h" 27 #include "audio/mixer.h" 28 29 #include "common/mutex.h" 30 31 namespace BladeRunner { 32 33 class BladeRunnerEngine; 34 35 class AudioMixer { 36 #if BLADERUNNER_ORIGINAL_BUGS 37 static const int kChannels = 9; 38 static const int kUsableChannels = 8; 39 static const int kMusicChannel = 8; 40 #else 41 static const int kChannels = 15; 42 static const int kUsableChannels = 14; 43 static const int kMusicChannel = 14; 44 #endif // BLADERUNNER_ORIGINAL_BUGS 45 static const int kUpdatesPerSecond = 40; 46 47 struct Channel { 48 bool isPresent; 49 int priority; 50 bool loop; 51 Audio::SoundHandle handle; 52 Audio::AudioStream *stream; 53 float volume; 54 float volumeDelta; 55 float volumeTarget; 56 float pan; 57 float panDelta; 58 float panTarget; 59 void (*endCallback)(int channel, void *data); 60 void *callbackData; 61 }; 62 63 BladeRunnerEngine *_vm; 64 65 Channel _channels[kChannels]; 66 Common::Mutex _mutex; 67 68 public: 69 AudioMixer(BladeRunnerEngine *vm); 70 ~AudioMixer(); 71 72 int play(Audio::Mixer::SoundType type, Audio::RewindableAudioStream *stream, int priority, bool loop, int volume, int pan, void(*endCallback)(int, void *), void *callbackData); 73 int playMusic(Audio::RewindableAudioStream *stream, int volume, void(*endCallback)(int, void *), void *callbackData); 74 void stop(int channel, uint32 delay); 75 76 void adjustVolume(int channel, int newVolume, uint32 time); 77 void adjustPan(int channel, int newPan, uint32 time); 78 79 void resume(int channel, uint32 delay); 80 void pause(int channel, uint32 delay); 81 82 private: 83 int playInChannel(int channel, Audio::Mixer::SoundType type, Audio::RewindableAudioStream *stream, int priority, bool loop, int volume, int pan, void(*endCallback)(int, void *), void *callbackData); 84 85 bool isActive(int channel) const; 86 void tick(); 87 static void timerCallback(void *refCon); 88 }; 89 90 } // End of namespace BladeRunner 91 92 #endif 93