Initial commit

engines/bladerunner/audio_mixer.h

@@ -0,0 +1,120 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef BLADERUNNER_AUDIO_MIXER_H
+#define BLADERUNNER_AUDIO_MIXER_H
+
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+
+#include "common/mutex.h"
+
+#include "bladerunner/bladerunner.h" // For BLADERUNNER_ORIGINAL_BUGS symbol
+
+namespace BladeRunner {
+
+class BladeRunnerEngine;
+
+#if !BLADERUNNER_ORIGINAL_BUGS
+enum audioMixerAppTimers {
+	kAudioMixerAppTimerMusicNext    =  0,
+	kAudioMixerAppTimerMusicFadeOut =  1
+};
+#endif
+
+class AudioMixer {
+#if BLADERUNNER_ORIGINAL_BUGS
+	static const int kChannels         = 9;
+	static const int kUsableChannels   = 8;
+	static const int kMusicChannel     = 8;
+#else
+	static const int kChannels         = 15;
+	static const int kUsableChannels   = 14;
+	static const int kMusicChannel     = 14;
+
+	static const int kAudioMixerAppTimersNum = 2;
+#endif // BLADERUNNER_ORIGINAL_BUGS
+	static const int kUpdatesPerSecond = 40;
+
+	struct Channel {
+		bool                isPresent;
+		int                 priority;
+		bool                loop;
+		Audio::SoundHandle  handle;
+		Audio::AudioStream *stream;
+		float               volume;       // should be in [0.0f, 100.0f]. It's percent for the Audio::Mixer::kMaxChannelVolume
+		float               volumeDelta;
+		float               volumeTarget; // should be in [0.0f, 100.0f], as for volume field.
+		float               pan;          // should be in [-100.0f, 100.0f]. It's percent for 127 (max absolute balance value)
+		float               panDelta;
+		float               panTarget;    // should be in [-100.0f, 100.0f], as for pan field.
+		void              (*endCallback)(int channel, void *data);
+		void               *callbackData;
+		uint32              timeStarted;
+		uint32              trackDurationMs;
+		bool                sentToMixer;
+	};
+
+	BladeRunnerEngine *_vm;
+
+	Channel       _channels[kChannels];
+	Common::Mutex _mutex;
+
+#if !BLADERUNNER_ORIGINAL_BUGS
+	struct audioMixerAppTimer {
+		bool                started;
+		uint32              intervalMillis; // expiration interval in milliseconds
+		uint32              lastFired;      // time of last time the timer expired in milliseconds
+	};
+
+	audioMixerAppTimer      _audioMixerAppTimers[kAudioMixerAppTimersNum];
+#endif // !BLADERUNNER_ORIGINAL_BUGS
+
+public:
+	AudioMixer(BladeRunnerEngine *vm);
+	~AudioMixer();
+
+	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);
+	int playMusic(Audio::RewindableAudioStream *stream, int volume, void(*endCallback)(int, void *), void *callbackData, uint32 trackDurationMs);
+	void stop(int channel, uint32 time);
+
+	void adjustVolume(int channel, int targetVolume, uint32 time);
+	void adjustPan(int channel, int targetPan, uint32 time);
+
+#if !BLADERUNNER_ORIGINAL_BUGS
+	void startAppTimerProc(int audioMixAppTimerId, uint32 intervalMillis);
+	void stopAppTimerProc(int audioMixAppTimerId);
+#endif // !BLADERUNNER_ORIGINAL_BUGS
+	// TODO Are these completely unused?
+//	void resume(int channel, uint32 delay);
+//	void pause(int channel, uint32 delay);
+
+private:
+	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);
+
+	bool isActive(int channel) const;
+	void tick();
+	static void timerCallback(void *refCon);
+};
+
+} // End of namespace BladeRunner
+
+#endif