1730e406ed
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15554 a1c6a512-1295-4272-9138-f99709370657
94 lines
3.8 KiB
C
94 lines
3.8 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin*/
|
|
/**
|
|
@file speex_stereo.h
|
|
@brief Describes the handling for intensity stereo
|
|
*/
|
|
/*
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
- Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
- Neither the name of the Xiph.org Foundation nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef STEREO_H
|
|
#define STEREO_H
|
|
/** @defgroup SpeexStereoState SpeexStereoState: Handling Speex stereo files
|
|
* This describes the Speex intensity stereo encoding/decoding
|
|
* @{
|
|
*/
|
|
|
|
#include "speex_types.h"
|
|
#include "speex_bits.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** State used for decoding (intensity) stereo information */
|
|
typedef struct SpeexStereoState {
|
|
#ifndef FIXED_POINT
|
|
float balance; /**< Left/right balance info */
|
|
float e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
|
|
float smooth_left; /**< Smoothed left channel gain */
|
|
float smooth_right; /**< Smoothed right channel gain */
|
|
float reserved1; /**< Reserved for future use */
|
|
float reserved2; /**< Reserved for future use */
|
|
#else
|
|
spx_int32_t balance; /**< Left/right balance info */
|
|
spx_int16_t e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
|
|
spx_int16_t smooth_left; /**< Smoothed left channel gain */
|
|
spx_int16_t smooth_right; /**< Smoothed right channel gain */
|
|
spx_int32_t reserved1; /**< Reserved for future use */
|
|
spx_int32_t reserved2; /**< Reserved for future use */
|
|
#endif
|
|
} SpeexStereoState;
|
|
|
|
/** Initialization value for a stereo state */
|
|
#ifndef FIXED_POINT
|
|
#define SPEEX_STEREO_STATE_INIT {1,.5,1,1,0,0}
|
|
#else
|
|
#define SPEEX_STEREO_STATE_INIT {65536,16384,16384,16384,0,0}
|
|
#endif
|
|
/** Transforms a stereo frame into a mono frame and stores intensity stereo info in 'bits' */
|
|
void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits);
|
|
|
|
/** Transforms a stereo frame into a mono frame and stores intensity stereo info in 'bits' */
|
|
void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits);
|
|
|
|
/** Transforms a mono frame into a stereo frame using intensity stereo info */
|
|
void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo);
|
|
|
|
/** Transforms a mono frame into a stereo frame using intensity stereo info */
|
|
void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState *stereo);
|
|
|
|
/** Callback handler for intensity stereo info */
|
|
int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/** @} */
|
|
#endif
|