1 /* Copyright (C) 2002-2006 Jean-Marc Valin */ 2 /** 3 @file nb_celp.h 4 @brief Narrowband CELP encoder/decoder 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 NB_CELP_H 37 #define NB_CELP_H 38 39 #include "modes.h" 40 #include <speex/speex_bits.h> 41 #include <speex/speex_callbacks.h> 42 #include "vbr.h" 43 #include "filters.h" 44 45 #ifdef VORBIS_PSYCHO 46 #include "vorbis_psy.h" 47 #endif 48 49 /**Structure representing the full state of the narrowband encoder*/ 50 typedef struct EncState { 51 const SpeexMode *mode; /**< Mode corresponding to the state */ 52 int first; /**< Is this the first frame? */ 53 int frameSize; /**< Size of frames */ 54 int subframeSize; /**< Size of sub-frames */ 55 int nbSubframes; /**< Number of sub-frames */ 56 int windowSize; /**< Analysis (LPC) window length */ 57 int lpcSize; /**< LPC order */ 58 int min_pitch; /**< Minimum pitch value allowed */ 59 int max_pitch; /**< Maximum pitch value allowed */ 60 61 spx_word32_t cumul_gain; /**< Product of previously used pitch gains (Q10) */ 62 int bounded_pitch; /**< Next frame should not rely on previous frames for pitch */ 63 int ol_pitch; /**< Open-loop pitch */ 64 int ol_voiced; /**< Open-loop voiced/non-voiced decision */ 65 int *pitch; 66 67 #ifdef VORBIS_PSYCHO 68 VorbisPsy *psy; 69 float *psy_window; 70 float *curve; 71 float *old_curve; 72 #endif 73 74 spx_word16_t gamma1; /**< Perceptual filter: A(z/gamma1) */ 75 spx_word16_t gamma2; /**< Perceptual filter: A(z/gamma2) */ 76 spx_word16_t lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/ 77 char *stack; /**< Pseudo-stack allocation for temporary memory */ 78 spx_word16_t *winBuf; /**< Input buffer (original signal) */ 79 spx_word16_t *excBuf; /**< Excitation buffer */ 80 spx_word16_t *exc; /**< Start of excitation frame */ 81 spx_word16_t *swBuf; /**< Weighted signal buffer */ 82 spx_word16_t *sw; /**< Start of weighted signal frame */ 83 const spx_word16_t *window; /**< Temporary (Hanning) window */ 84 const spx_word16_t *lagWindow; /**< Window applied to auto-correlation */ 85 spx_lsp_t *old_lsp; /**< LSPs for previous frame */ 86 spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */ 87 spx_mem_t *mem_sp; /**< Filter memory for signal synthesis */ 88 spx_mem_t *mem_sw; /**< Filter memory for perceptually-weighted signal */ 89 spx_mem_t *mem_sw_whole; /**< Filter memory for perceptually-weighted signal (whole frame)*/ 90 spx_mem_t *mem_exc; /**< Filter memory for excitation (whole frame) */ 91 spx_mem_t *mem_exc2; /**< Filter memory for excitation (whole frame) */ 92 spx_mem_t mem_hp[2]; /**< High-pass filter memory */ 93 spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */ 94 spx_word16_t *innov_rms_save; /**< If non-NULL, innovation RMS is copied here */ 95 96 #ifndef DISABLE_VBR 97 VBRState *vbr; /**< State of the VBR data */ 98 float vbr_quality; /**< Quality setting for VBR encoding */ 99 float relative_quality; /**< Relative quality that will be needed by VBR */ 100 spx_int32_t vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */ 101 spx_int32_t vbr_max; /**< Max bit-rate allowed in VBR mode */ 102 int vad_enabled; /**< 1 for enabling VAD, 0 otherwise */ 103 int dtx_enabled; /**< 1 for enabling DTX, 0 otherwise */ 104 int dtx_count; /**< Number of consecutive DTX frames */ 105 spx_int32_t abr_enabled; /**< ABR setting (in bps), 0 if off */ 106 float abr_drift; 107 float abr_drift2; 108 float abr_count; 109 #endif /* #ifndef DISABLE_VBR */ 110 111 int complexity; /**< Complexity setting (0-10 from least complex to most complex) */ 112 spx_int32_t sampling_rate; 113 int plc_tuning; 114 int encode_submode; 115 const SpeexSubmode * const *submodes; /**< Sub-mode data */ 116 int submodeID; /**< Activated sub-mode */ 117 int submodeSelect; /**< Mode chosen by the user (may differ from submodeID if VAD is on) */ 118 int isWideband; /**< Is this used as part of the embedded wideband codec */ 119 int highpass_enabled; /**< Is the input filter enabled */ 120 } EncState; 121 122 /**Structure representing the full state of the narrowband decoder*/ 123 typedef struct DecState { 124 const SpeexMode *mode; /**< Mode corresponding to the state */ 125 int first; /**< Is this the first frame? */ 126 int count_lost; /**< Was the last frame lost? */ 127 int frameSize; /**< Size of frames */ 128 int subframeSize; /**< Size of sub-frames */ 129 int nbSubframes; /**< Number of sub-frames */ 130 int lpcSize; /**< LPC order */ 131 int min_pitch; /**< Minimum pitch value allowed */ 132 int max_pitch; /**< Maximum pitch value allowed */ 133 spx_int32_t sampling_rate; 134 135 spx_word16_t last_ol_gain; /**< Open-loop gain for previous frame */ 136 137 char *stack; /**< Pseudo-stack allocation for temporary memory */ 138 spx_word16_t *excBuf; /**< Excitation buffer */ 139 spx_word16_t *exc; /**< Start of excitation frame */ 140 spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */ 141 spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */ 142 spx_mem_t *mem_sp; /**< Filter memory for synthesis signal */ 143 spx_mem_t mem_hp[2]; /**< High-pass filter memory */ 144 spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */ 145 spx_word16_t *innov_save; /** If non-NULL, innovation is copied here */ 146 147 spx_word16_t level; 148 spx_word16_t max_level; 149 spx_word16_t min_level; 150 151 /* This is used in packet loss concealment */ 152 int last_pitch; /**< Pitch of last correctly decoded frame */ 153 spx_word16_t last_pitch_gain; /**< Pitch gain of last correctly decoded frame */ 154 spx_word16_t pitch_gain_buf[3]; /**< Pitch gain of last decoded frames */ 155 int pitch_gain_buf_idx; /**< Tail of the buffer */ 156 spx_int32_t seed; /** Seed used for random number generation */ 157 158 int encode_submode; 159 const SpeexSubmode * const *submodes; /**< Sub-mode data */ 160 int submodeID; /**< Activated sub-mode */ 161 int lpc_enh_enabled; /**< 1 when LPC enhancer is on, 0 otherwise */ 162 SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS]; 163 164 SpeexCallback user_callback; 165 166 /*Vocoder data*/ 167 spx_word16_t voc_m1; 168 spx_word32_t voc_m2; 169 spx_word16_t voc_mean; 170 int voc_offset; 171 172 int dtx_enabled; 173 int isWideband; /**< Is this used as part of the embedded wideband codec */ 174 int highpass_enabled; /**< Is the input filter enabled */ 175 } DecState; 176 177 /** Initializes encoder state*/ 178 void *nb_encoder_init(const SpeexMode *m); 179 180 /** De-allocates encoder state resources*/ 181 void nb_encoder_destroy(void *state); 182 183 /** Encodes one frame*/ 184 int nb_encode(void *state, void *in, SpeexBits *bits); 185 186 187 /** Initializes decoder state*/ 188 void *nb_decoder_init(const SpeexMode *m); 189 190 /** De-allocates decoder state resources*/ 191 void nb_decoder_destroy(void *state); 192 193 /** Decodes one frame*/ 194 int nb_decode(void *state, SpeexBits *bits, void *out); 195 196 /** ioctl-like function for controlling a narrowband encoder */ 197 int nb_encoder_ctl(void *state, int request, void *ptr); 198 199 /** ioctl-like function for controlling a narrowband decoder */ 200 int nb_decoder_ctl(void *state, int request, void *ptr); 201 202 203 #endif 204
