| /* 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/speex_types.h" |
| #include "speex/speex_bits.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** If you access any of these fields directly, I'll personally come and bite you */ |
| typedef struct SpeexStereoState { |
| 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 */ |
| } SpeexStereoState; |
| |
| /** Deprecated. Use speex_stereo_state_init() instead. */ |
| #define SPEEX_STEREO_STATE_INIT {1,.5,1,1,0,0} |
| |
| /** Initialise/create a stereo stereo state */ |
| SpeexStereoState *speex_stereo_state_init(); |
| |
| /** Reset/re-initialise an already allocated stereo state */ |
| void speex_stereo_state_reset(SpeexStereoState *stereo); |
| |
| /** Destroy a stereo stereo state */ |
| void speex_stereo_state_destroy(SpeexStereoState *stereo); |
| |
| /** 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 |