Split off the actual mixing part of SoundBlaster

svn-id: r31938

1 files changed, 95 insertions, 0 deletions

diff --git a/engines/gob/sound/soundmixer.h b/engines/gob/sound/soundmixer.h
new file mode 100644
index 0000000000..e22cd7b473
--- /dev/null
+++ b/engines/gob/sound/soundmixer.h
@@ -0,0 +1,95 @@
+/* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef GOB_SOUND_SOUNDMIXER_H
+#define GOB_SOUND_SOUNDMIXER_H
+
+#include "common/mutex.h"
+#include "common/frac.h"
+#include "sound/audiostream.h"
+#include "sound/mixer.h"
+
+#include "gob/sound/sounddesc.h"
+
+namespace Gob {
+
+class SoundMixer : public Audio::AudioStream {
+public:
+	SoundMixer(Audio::Mixer &mixer);
+	~SoundMixer();
+
+	virtual void play(SoundDesc &sndDesc, int16 repCount,
+			int16 frequency, int16 fadeLength = 0);
+	virtual void stop(int16 fadeLength);
+
+	bool isPlaying() const;
+	char getPlayingSound() const;
+
+	void setRepeating(int32 repCount);
+
+	int readBuffer(int16 *buffer, const int numSamples);
+	bool isStereo() const { return false; }
+	bool endOfData() const { return _end; }
+	bool endOfStream() const { return false; }
+	int getRate() const { return _rate; }
+
+protected:
+	Audio::Mixer *_mixer;
+
+	Audio::SoundHandle _handle;
+	Common::Mutex _mutex;
+
+	bool _end;
+	int8 *_data;
+	uint32 _length;
+	uint32 _rate;
+	int32 _freq;
+	int32 _repCount;
+
+	uint32 _offset;
+	frac_t _offsetFrac;
+	frac_t _offsetInc;
+
+	int16 _cur;
+	int16 _last;
+
+	bool _fade;
+	int32 _fadeVol;
+	int32 _fadeVolStep;
+	uint8 _fadeLength;
+	uint32 _fadeSamples;
+	uint32 _curFadeSamples;
+
+	char _playingSound;
+
+	virtual void setSample(SoundDesc &sndDesc, int16 repCount,
+			int16 frequency, int16 fadeLength);
+	virtual void checkEndSample();
+	virtual void endFade();
+};
+
+} // End of namespace Gob
+
+#endif // GOB_SOUND_SOUNDMIXER_H