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 #if !BLADERUNNER_ORIGINAL_BUG 36 enum audioMixerAppTimers { 37 kAudioMixerAppTimerMusicNext = 0, 38 kAudioMixerAppTimerMusicFadeOut = 1 39 }; 40 #endif 41 42 class AudioMixer { 43 #if BLADERUNNER_ORIGINAL_BUGS 44 static const int kChannels = 9; 45 static const int kUsableChannels = 8; 46 static const int kMusicChannel = 8; 47 #else 48 static const int kChannels = 15; 49 static const int kUsableChannels = 14; 50 static const int kMusicChannel = 14; 51 52 static const int kAudioMixerAppTimersNum = 2; 53 #endif // BLADERUNNER_ORIGINAL_BUGS 54 static const int kUpdatesPerSecond = 40; 55 56 struct Channel { 57 bool isPresent; 58 int priority; 59 bool loop; 60 Audio::SoundHandle handle; 61 Audio::AudioStream *stream; 62 float volume; 63 float volumeDelta; 64 float volumeTarget; 65 float pan; 66 float panDelta; 67 float panTarget; 68 void (*endCallback)(int channel, void *data); 69 void *callbackData; 70 uint32 timeStarted; 71 uint32 trackDurationMs; 72 bool sentToMixer; 73 }; 74 75 BladeRunnerEngine *_vm; 76 77 Channel _channels[kChannels]; 78 Common::Mutex _mutex; 79 80 #if !BLADERUNNER_ORIGINAL_BUGS 81 struct audioMixerAppTimer { 82 bool started; 83 uint32 intervalMillis; // expiration interval in milliseconds 84 uint32 lastFired; // time of last time the timer expired in milliseconds 85 }; 86 87 audioMixerAppTimer _audioMixerAppTimers[kAudioMixerAppTimersNum]; 88 #endif // !BLADERUNNER_ORIGINAL_BUGS 89 90 public: 91 AudioMixer(BladeRunnerEngine *vm); 92 ~AudioMixer(); 93 94 int play(Audio::Mixer::SoundType type, Audio::RewindableAudioStream *stream, int priority, bool loop, int volume, int pan, void(*endCallback)(int, void *), void *callbackData, uint32 trackDurationMs); 95 int playMusic(Audio::RewindableAudioStream *stream, int volume, void(*endCallback)(int, void *), void *callbackData, uint32 trackDurationMs); 96 void stop(int channel, uint32 time); 97 98 void adjustVolume(int channel, int newVolume, uint32 time); 99 void adjustPan(int channel, int newPan, uint32 time); 100 101 #if !BLADERUNNER_ORIGINAL_BUGS 102 void startAppTimerProc(int audioMixAppTimerId, uint32 intervalMillis); 103 void stopAppTimerProc(int audioMixAppTimerId); 104 #endif // !BLADERUNNER_ORIGINAL_BUGS 105 // TODO Are these completely unused? 106 // void resume(int channel, uint32 delay); 107 // void pause(int channel, uint32 delay); 108 109 private: 110 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, uint32 trackDurationMs); 111 112 bool isActive(int channel) const; 113 void tick(); 114 static void timerCallback(void *refCon); 115 }; 116 117 } // End of namespace BladeRunner 118 119 #endif 120