| /* Copyright (C) 2002 Jean-Marc Valin */ |
| /** |
| @file vbr.h |
| @brief Variable Bit-Rate (VBR) related routines |
| */ |
| /* |
| 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 VBR_H |
| #define VBR_H |
| |
| #include "arch.h" |
| |
| #define VBR_MEMORY_SIZE 5 |
| |
| extern const float vbr_nb_thresh[9][11]; |
| extern const float vbr_hb_thresh[5][11]; |
| extern const float vbr_uhb_thresh[2][11]; |
| |
| /** VBR state. */ |
| typedef struct VBRState { |
| float energy_alpha; |
| float average_energy; |
| float last_energy; |
| float last_log_energy[VBR_MEMORY_SIZE]; |
| float accum_sum; |
| float last_pitch_coef; |
| float soft_pitch; |
| float last_quality; |
| float noise_level; |
| float noise_accum; |
| float noise_accum_count; |
| int consec_noise; |
| } VBRState; |
| |
| void vbr_init(VBRState *vbr); |
| |
| float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef); |
| |
| void vbr_destroy(VBRState *vbr); |
| |
| #endif |