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| 1 /* Copyright (C) 2002 Jean-Marc Valin */ |
| 2 /** |
| 3 @file vbr.h |
| 4 @brief Variable Bit-Rate (VBR) related routines |
| 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 |
| 36 |
| 37 #ifndef VBR_H |
| 38 #define VBR_H |
| 39 |
| 40 #include "arch.h" |
| 41 |
| 42 #define VBR_MEMORY_SIZE 5 |
| 43 |
| 44 extern const float vbr_nb_thresh[9][11]; |
| 45 extern const float vbr_hb_thresh[5][11]; |
| 46 extern const float vbr_uhb_thresh[2][11]; |
| 47 |
| 48 /** VBR state. */ |
| 49 typedef struct VBRState { |
| 50 float energy_alpha; |
| 51 float average_energy; |
| 52 float last_energy; |
| 53 float last_log_energy[VBR_MEMORY_SIZE]; |
| 54 float accum_sum; |
| 55 float last_pitch_coef; |
| 56 float soft_pitch; |
| 57 float last_quality; |
| 58 float noise_level; |
| 59 float noise_accum; |
| 60 float noise_accum_count; |
| 61 int consec_noise; |
| 62 } VBRState; |
| 63 |
| 64 void vbr_init(VBRState *vbr); |
| 65 |
| 66 float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float p
itch_coef); |
| 67 |
| 68 void vbr_destroy(VBRState *vbr); |
| 69 |
| 70 #endif |
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