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63 lines
2.7 KiB
63 lines
2.7 KiB
14 years ago
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/* Copyright (C) 2002 Jean-Marc Valin*/
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/**
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@file speex_stereo.h
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@brief Describes the handling for intensity stereo
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef STEREO_H
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#define STEREO_H
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#include "speex_bits.h"
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/** State used for decoding (intensity) stereo information */
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typedef struct SpeexStereoState {
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float balance; /**< Left/right balance info */
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float e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
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float smooth_left; /**< Smoothed left channel gain */
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float smooth_right; /**< Smoothed right channel gain */
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float reserved1; /**< Reserved for future use */
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float reserved2; /**< Reserved for future use */
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} SpeexStereoState;
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/** Initialization value for a stereo state */
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#define SPEEX_STEREO_STATE_INIT {1,.5,1,1}
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/** Transforms a stereo frame into a mono frame and stores intensity stereo info in 'bits' */
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void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits);
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/** Transforms a mono frame into a stereo frame using intensity stereo info */
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void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo);
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/** Callback handler for intensity stereo info */
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int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data);
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#endif
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