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Diffstat (limited to 'intern/audaspace/FX/AUD_LowpassReader.h')
-rw-r--r-- | intern/audaspace/FX/AUD_LowpassReader.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_LowpassReader.h b/intern/audaspace/FX/AUD_LowpassReader.h new file mode 100644 index 00000000000..a490ba52c1c --- /dev/null +++ b/intern/audaspace/FX/AUD_LowpassReader.h @@ -0,0 +1,83 @@ +/* + * $Id$ + * + * ***** BEGIN LGPL LICENSE BLOCK ***** + * + * Copyright 2009 Jörg Hermann Müller + * + * This file is part of AudaSpace. + * + * AudaSpace is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * AudaSpace 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 Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with AudaSpace. If not, see <http://www.gnu.org/licenses/>. + * + * ***** END LGPL LICENSE BLOCK ***** + */ + +#ifndef AUD_LOWPASSREADER +#define AUD_LOWPASSREADER + +#include "AUD_EffectReader.h" +class AUD_Buffer; + +#define AUD_LOWPASS_ORDER 3 + +/** + * This class represents a lowpass filter. + */ +class AUD_LowpassReader : public AUD_EffectReader +{ +private: + /** + * The playback buffer. + */ + AUD_Buffer *m_buffer; + + /** + * The last out values buffer. + */ + AUD_Buffer *m_outvalues; + + /** + * The last in values buffer. + */ + AUD_Buffer *m_invalues; + + /** + * The position for buffer cycling. + */ + int m_position; + + /** + * Filter coefficients. + */ + float m_coeff[2][AUD_LOWPASS_ORDER]; + +public: + /** + * Creates a new lowpass reader. + * \param reader The reader to read from. + * \param frequency The cutoff frequency. + * \param Q The Q factor. + * \exception AUD_Exception Thrown if the reader specified is NULL. + */ + AUD_LowpassReader(AUD_IReader* reader, float frequency, float Q); + + /** + * Destroys the reader. + */ + virtual ~AUD_LowpassReader(); + + virtual void read(int & length, sample_t* & buffer); +}; + +#endif //AUD_LOWPASSREADER |