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| 1 /* Copyright (C) 2002 Jean-Marc Valin*/ |
| 2 /** |
| 3 @file speex_stereo.h |
| 4 @brief Describes the handling for intensity stereo |
| 5 */ |
| 6 /* |
| 7 Redistribution and use in source and binary forms, with or without |
| 8 modification, are permitted provided that the following conditions |
| 9 are met: |
| 10 |
| 11 - Redistributions of source code must retain the above copyright |
| 12 notice, this list of conditions and the following disclaimer. |
| 13 |
| 14 - Redistributions in binary form must reproduce the above copyright |
| 15 notice, this list of conditions and the following disclaimer in the |
| 16 documentation and/or other materials provided with the distribution. |
| 17 |
| 18 - Neither the name of the Xiph.org Foundation nor the names of its |
| 19 contributors may be used to endorse or promote products derived from |
| 20 this software without specific prior written permission. |
| 21 |
| 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 */ |
| 34 |
| 35 #ifndef STEREO_H |
| 36 #define STEREO_H |
| 37 /** @defgroup SpeexStereoState SpeexStereoState: Handling Speex stereo files |
| 38 * This describes the Speex intensity stereo encoding/decoding |
| 39 * @{ |
| 40 */ |
| 41 |
| 42 #include "speex/speex_types.h" |
| 43 #include "speex/speex_bits.h" |
| 44 |
| 45 #ifdef __cplusplus |
| 46 extern "C" { |
| 47 #endif |
| 48 |
| 49 /** If you access any of these fields directly, I'll personally come and bite yo
u */ |
| 50 typedef struct SpeexStereoState { |
| 51 float balance; /**< Left/right balance info */ |
| 52 float e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)]
*/ |
| 53 float smooth_left; /**< Smoothed left channel gain */ |
| 54 float smooth_right; /**< Smoothed right channel gain */ |
| 55 float reserved1; /**< Reserved for future use */ |
| 56 float reserved2; /**< Reserved for future use */ |
| 57 } SpeexStereoState; |
| 58 |
| 59 /** Deprecated. Use speex_stereo_state_init() instead. */ |
| 60 #define SPEEX_STEREO_STATE_INIT {1,.5,1,1,0,0} |
| 61 |
| 62 /** Initialise/create a stereo stereo state */ |
| 63 SpeexStereoState *speex_stereo_state_init(); |
| 64 |
| 65 /** Reset/re-initialise an already allocated stereo state */ |
| 66 void speex_stereo_state_reset(SpeexStereoState *stereo); |
| 67 |
| 68 /** Destroy a stereo stereo state */ |
| 69 void speex_stereo_state_destroy(SpeexStereoState *stereo); |
| 70 |
| 71 /** Transforms a stereo frame into a mono frame and stores intensity stereo info
in 'bits' */ |
| 72 void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits); |
| 73 |
| 74 /** Transforms a stereo frame into a mono frame and stores intensity stereo info
in 'bits' */ |
| 75 void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits)
; |
| 76 |
| 77 /** Transforms a mono frame into a stereo frame using intensity stereo info */ |
| 78 void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo); |
| 79 |
| 80 /** Transforms a mono frame into a stereo frame using intensity stereo info */ |
| 81 void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState
*stereo); |
| 82 |
| 83 /** Callback handler for intensity stereo info */ |
| 84 int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data); |
| 85 |
| 86 #ifdef __cplusplus |
| 87 } |
| 88 #endif |
| 89 |
| 90 /** @} */ |
| 91 #endif |
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