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DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/include/speex/speex_stereo.h@47:9e361da97763, 2017-07-18 (annotated)

Committer:
TMBOY
Date:
Tue Jul 18 16:54:45 2017 +0800
Revision:
47:9e361da97763
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TMBOY 47:9e361da97763 1 /* Copyright (C) 2002 Jean-Marc Valin*/
TMBOY 47:9e361da97763 2 /**
TMBOY 47:9e361da97763 3 @file speex_stereo.h
TMBOY 47:9e361da97763 4 @brief Describes the handling for intensity stereo
TMBOY 47:9e361da97763 5 */
TMBOY 47:9e361da97763 6 /*
TMBOY 47:9e361da97763 7 Redistribution and use in source and binary forms, with or without
TMBOY 47:9e361da97763 8 modification, are permitted provided that the following conditions
TMBOY 47:9e361da97763 9 are met:
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 - Redistributions of source code must retain the above copyright
TMBOY 47:9e361da97763 12 notice, this list of conditions and the following disclaimer.
TMBOY 47:9e361da97763 13
TMBOY 47:9e361da97763 14 - Redistributions in binary form must reproduce the above copyright
TMBOY 47:9e361da97763 15 notice, this list of conditions and the following disclaimer in the
TMBOY 47:9e361da97763 16 documentation and/or other materials provided with the distribution.
TMBOY 47:9e361da97763 17
TMBOY 47:9e361da97763 18 - Neither the name of the Xiph.org Foundation nor the names of its
TMBOY 47:9e361da97763 19 contributors may be used to endorse or promote products derived from
TMBOY 47:9e361da97763 20 this software without specific prior written permission.
TMBOY 47:9e361da97763 21
TMBOY 47:9e361da97763 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
TMBOY 47:9e361da97763 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
TMBOY 47:9e361da97763 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
TMBOY 47:9e361da97763 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
TMBOY 47:9e361da97763 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
TMBOY 47:9e361da97763 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
TMBOY 47:9e361da97763 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
TMBOY 47:9e361da97763 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
TMBOY 47:9e361da97763 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
TMBOY 47:9e361da97763 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
TMBOY 47:9e361da97763 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
TMBOY 47:9e361da97763 33 */
TMBOY 47:9e361da97763 34
TMBOY 47:9e361da97763 35 #ifndef STEREO_H
TMBOY 47:9e361da97763 36 #define STEREO_H
TMBOY 47:9e361da97763 37 /** @defgroup SpeexStereoState SpeexStereoState: Handling Speex stereo files
TMBOY 47:9e361da97763 38 * This describes the Speex intensity stereo encoding/decoding
TMBOY 47:9e361da97763 39 * @{
TMBOY 47:9e361da97763 40 */
TMBOY 47:9e361da97763 41
TMBOY 47:9e361da97763 42 #include "speex/speex_types.h"
TMBOY 47:9e361da97763 43 #include "speex/speex_bits.h"
TMBOY 47:9e361da97763 44
TMBOY 47:9e361da97763 45 #ifdef __cplusplus
TMBOY 47:9e361da97763 46 extern "C" {
TMBOY 47:9e361da97763 47 #endif
TMBOY 47:9e361da97763 48
TMBOY 47:9e361da97763 49 /** State used for decoding (intensity) stereo information */
TMBOY 47:9e361da97763 50 typedef struct SpeexStereoState {
TMBOY 47:9e361da97763 51 float balance; /**< Left/right balance info */
TMBOY 47:9e361da97763 52 float e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
TMBOY 47:9e361da97763 53 float smooth_left; /**< Smoothed left channel gain */
TMBOY 47:9e361da97763 54 float smooth_right; /**< Smoothed right channel gain */
TMBOY 47:9e361da97763 55 float reserved1; /**< Reserved for future use */
TMBOY 47:9e361da97763 56 float reserved2; /**< Reserved for future use */
TMBOY 47:9e361da97763 57 } SpeexStereoState;
TMBOY 47:9e361da97763 58
TMBOY 47:9e361da97763 59 /** Initialization value for a stereo state */
TMBOY 47:9e361da97763 60 #define SPEEX_STEREO_STATE_INIT {1,.5,1,1,0,0}
TMBOY 47:9e361da97763 61
TMBOY 47:9e361da97763 62 /** Transforms a stereo frame into a mono frame and stores intensity stereo info in 'bits' */
TMBOY 47:9e361da97763 63 void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits);
TMBOY 47:9e361da97763 64
TMBOY 47:9e361da97763 65 /** Transforms a stereo frame into a mono frame and stores intensity stereo info in 'bits' */
TMBOY 47:9e361da97763 66 void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits);
TMBOY 47:9e361da97763 67
TMBOY 47:9e361da97763 68 /** Transforms a mono frame into a stereo frame using intensity stereo info */
TMBOY 47:9e361da97763 69 void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo);
TMBOY 47:9e361da97763 70
TMBOY 47:9e361da97763 71 /** Transforms a mono frame into a stereo frame using intensity stereo info */
TMBOY 47:9e361da97763 72 void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState *stereo);
TMBOY 47:9e361da97763 73
TMBOY 47:9e361da97763 74 /** Callback handler for intensity stereo info */
TMBOY 47:9e361da97763 75 int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data);
TMBOY 47:9e361da97763 76
TMBOY 47:9e361da97763 77 #ifdef __cplusplus
TMBOY 47:9e361da97763 78 }
TMBOY 47:9e361da97763 79 #endif
TMBOY 47:9e361da97763 80
TMBOY 47:9e361da97763 81 /** @} */
TMBOY 47:9e361da97763 82 #endif