plugins/audio/Speex/libspeex/modes.h

   1 /* Copyright (C) 2002 Jean-Marc Valin */
   2 /**
   3    @file modes.h
   4    @brief Describes the different modes of the codec
   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 #ifndef MODES_H
  37 #define MODES_H
  38
  39 #include "speex.h"
  40 #include "speex_bits.h"
  41
  42
  43 #define NB_SUBMODES 16
  44 #define NB_SUBMODE_BITS 4
  45
  46 #define SB_SUBMODES 8
  47 #define SB_SUBMODE_BITS 3
  48
  49
  50 /** Quantizes LSPs */
  51 typedef void (*lsp_quant_func)(float *, float *, int, SpeexBits *);
  52
  53 /** Decodes quantized LSPs */
  54 typedef void (*lsp_unquant_func)(float *, int, SpeexBits *);
  55
  56
  57 /** Long-term predictor quantization */
  58 typedef int (*ltp_quant_func)(float *, float *, float *, float *,
  59                               float *, float *, void *, int, int, float,
  60                               int, int, SpeexBits*, char *, float *, float *, int);
  61
  62 /** Long-term un-quantize */
  63 typedef void (*ltp_unquant_func)(float *, int, int, float, void *, int, int *,
  64                                  float *, SpeexBits*, char*, int, int, float);
  65
  66
  67 /** Innovation quantization function */
  68 typedef void (*innovation_quant_func)(float *, float *, float *, float *, void *, int, int,
  69                                       float *, float *, SpeexBits *, char *, int);
  70
  71 /** Innovation unquantization function */
  72 typedef void (*innovation_unquant_func)(float *, void *, int, SpeexBits*, char *);
  73
  74 /** Description of a Speex sub-mode (wither narrowband or wideband */
  75 typedef struct SpeexSubmode {
  76    int     lbr_pitch;          /**< Set to -1 for "normal" modes, otherwise encode pitch using a global pitch and allowing a +- lbr_pitch variation (for low not-rates)*/
  77    int     forced_pitch_gain;  /**< Use the same (forced) pitch gain for all sub-frames */
  78    int     have_subframe_gain; /**< Number of bits to use as sub-frame innovation gain */
  79    int     double_codebook;    /**< Apply innovation quantization twice for higher quality (and higher bit-rate)*/
  80    /*LSP functions*/
  81    lsp_quant_func    lsp_quant; /**< LSP quantization function */
  82    lsp_unquant_func  lsp_unquant; /**< LSP unquantization function */
  83
  84    /*Lont-term predictor functions*/
  85    ltp_quant_func    ltp_quant; /**< Long-term predictor (pitch) quantizer */
  86    ltp_unquant_func  ltp_unquant; /**< Long-term predictor (pitch) un-quantizer */
  87    void             *ltp_params; /**< Pitch parameters (options) */
  88
  89    /*Quantization of innovation*/
  90    innovation_quant_func innovation_quant; /**< Innovation quantization */
  91    innovation_unquant_func innovation_unquant; /**< Innovation un-quantization */
  92    void             *innovation_params; /**< Innovation quantization parameters*/
  93
  94    /*Synthesis filter enhancement*/
  95    float             lpc_enh_k1; /**< Enhancer constant */
  96    float             lpc_enh_k2; /**< Enhancer constant */
  97    float             comb_gain;  /**< Gain of enhancer comb filter */
  98
  99    int               bits_per_frame; /**< Number of bits per frame after encoding*/
 100 } SpeexSubmode;
 101
 102 /** Struct defining the encoding/decoding mode*/
 103 typedef struct SpeexNBMode {
 104    int     frameSize;      /**< Size of frames used for encoding */
 105    int     subframeSize;   /**< Size of sub-frames used for encoding */
 106    int     lpcSize;        /**< Order of LPC filter */
 107    int     bufSize;        /**< Size of signal buffer to use in encoder */
 108    int     pitchStart;     /**< Smallest pitch value allowed */
 109    int     pitchEnd;       /**< Largest pitch value allowed */
 110
 111    float   gamma1;         /**< Perceptual filter parameter #1 */
 112    float   gamma2;         /**< Perceptual filter parameter #2 */
 113    float   lag_factor;     /**< Lag-windowing parameter */
 114    float   lpc_floor;      /**< Noise floor for LPC analysis */
 115    float   preemph;        /**< Pre-emphasis */
 116
 117    SpeexSubmode *submodes[NB_SUBMODES]; /**< Sub-mode data for the mode */
 118    int     defaultSubmode; /**< Default sub-mode to use when encoding */
 119    int     quality_map[11]; /**< Mode corresponding to each quality setting */
 120 } SpeexNBMode;
 121
 122
 123 /** Struct defining the encoding/decoding mode for SB-CELP (wideband) */
 124 typedef struct SpeexSBMode {
 125    SpeexMode *nb_mode;    /**< Embedded narrowband mode */
 126    int     frameSize;     /**< Size of frames used for encoding */
 127    int     subframeSize;  /**< Size of sub-frames used for encoding */
 128    int     lpcSize;       /**< Order of LPC filter */
 129    int     bufSize;       /**< Signal buffer size in encoder */
 130    float   gamma1;        /**< Perceptual filter parameter #1 */
 131    float   gamma2;        /**< Perceptual filter parameter #1 */
 132    float   lag_factor;    /**< Lag-windowing parameter */
 133    float   lpc_floor;     /**< Noise floor for LPC analysis */
 134    float   preemph;       /**< Pre-emphasis */
 135    float   folding_gain;
 136
 137    SpeexSubmode *submodes[SB_SUBMODES]; /**< Sub-mode data for the mode */
 138    int     defaultSubmode; /**< Default sub-mode to use when encoding */
 139    int     low_quality_map[11]; /**< Mode corresponding to each quality setting */
 140    int     quality_map[11]; /**< Mode corresponding to each quality setting */
 141    float   (*vbr_thresh)[11];
 142    int     nb_modes;
 143 } SpeexSBMode;
 144
 145
 146 #endif