153 lines
6.8 KiB
C
153 lines
6.8 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file modes.h
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@brief Describes the different modes of the codec
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MODES_H
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#define MODES_H
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#include <speex/speex.h>
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#include <speex/speex_bits.h>
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#include "misc.h"
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#define NB_SUBMODES 16
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#define NB_SUBMODE_BITS 4
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#define SB_SUBMODES 8
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#define SB_SUBMODE_BITS 3
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/** Quantizes LSPs */
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typedef void (*lsp_quant_func)(spx_lsp_t *, spx_lsp_t *, int, SpeexBits *);
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/** Decodes quantized LSPs */
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typedef void (*lsp_unquant_func)(spx_lsp_t *, int, SpeexBits *);
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/** Long-term predictor quantization */
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typedef int (*ltp_quant_func)(spx_sig_t *, spx_sig_t *, spx_coef_t *, spx_coef_t *,
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spx_coef_t *, spx_sig_t *, const void *, int, int, spx_word16_t,
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int, int, SpeexBits*, char *, spx_sig_t *, spx_word16_t *, int, int, int);
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/** Long-term un-quantize */
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typedef void (*ltp_unquant_func)(spx_sig_t *, int, int, spx_word16_t, const void *, int, int *,
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spx_word16_t *, SpeexBits*, char*, int, int, spx_word16_t, int);
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/** Innovation quantization function */
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typedef void (*innovation_quant_func)(spx_sig_t *, spx_coef_t *, spx_coef_t *, spx_coef_t *, const void *, int, int,
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spx_sig_t *, spx_word16_t *, SpeexBits *, char *, int, int);
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/** Innovation unquantization function */
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typedef void (*innovation_unquant_func)(spx_sig_t *, const void *, int, SpeexBits*, char *);
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/** Description of a Speex sub-mode (wither narrowband or wideband */
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typedef struct SpeexSubmode {
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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)*/
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int forced_pitch_gain; /**< Use the same (forced) pitch gain for all sub-frames */
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int have_subframe_gain; /**< Number of bits to use as sub-frame innovation gain */
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int double_codebook; /**< Apply innovation quantization twice for higher quality (and higher bit-rate)*/
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/*LSP functions*/
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lsp_quant_func lsp_quant; /**< LSP quantization function */
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lsp_unquant_func lsp_unquant; /**< LSP unquantization function */
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/*Lont-term predictor functions*/
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ltp_quant_func ltp_quant; /**< Long-term predictor (pitch) quantizer */
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ltp_unquant_func ltp_unquant; /**< Long-term predictor (pitch) un-quantizer */
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const void *ltp_params; /**< Pitch parameters (options) */
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/*Quantization of innovation*/
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innovation_quant_func innovation_quant; /**< Innovation quantization */
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innovation_unquant_func innovation_unquant; /**< Innovation un-quantization */
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const void *innovation_params; /**< Innovation quantization parameters*/
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/*Synthesis filter enhancement*/
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spx_word16_t lpc_enh_k1; /**< Enhancer constant */
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spx_word16_t lpc_enh_k2; /**< Enhancer constant */
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spx_word16_t lpc_enh_k3; /**< Enhancer constant */
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spx_word16_t comb_gain; /**< Gain of enhancer comb filter */
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int bits_per_frame; /**< Number of bits per frame after encoding*/
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} SpeexSubmode;
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/** Struct defining the encoding/decoding mode*/
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typedef struct SpeexNBMode {
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int frameSize; /**< Size of frames used for encoding */
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int subframeSize; /**< Size of sub-frames used for encoding */
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int lpcSize; /**< Order of LPC filter */
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int pitchStart; /**< Smallest pitch value allowed */
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int pitchEnd; /**< Largest pitch value allowed */
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spx_word16_t gamma1; /**< Perceptual filter parameter #1 */
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spx_word16_t gamma2; /**< Perceptual filter parameter #2 */
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float lag_factor; /**< Lag-windowing parameter */
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float lpc_floor; /**< Noise floor for LPC analysis */
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#ifdef EPIC_48K
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int lbr48k; /**< 1 for the special 4.8 kbps mode */
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#endif
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const SpeexSubmode *submodes[NB_SUBMODES]; /**< Sub-mode data for the mode */
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int defaultSubmode; /**< Default sub-mode to use when encoding */
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int quality_map[11]; /**< Mode corresponding to each quality setting */
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} SpeexNBMode;
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/** Struct defining the encoding/decoding mode for SB-CELP (wideband) */
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typedef struct SpeexSBMode {
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const SpeexMode *nb_mode; /**< Embedded narrowband mode */
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int frameSize; /**< Size of frames used for encoding */
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int subframeSize; /**< Size of sub-frames used for encoding */
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int lpcSize; /**< Order of LPC filter */
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int bufSize; /**< Signal buffer size in encoder */
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spx_word16_t gamma1; /**< Perceptual filter parameter #1 */
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spx_word16_t gamma2; /**< Perceptual filter parameter #1 */
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float lag_factor; /**< Lag-windowing parameter */
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float lpc_floor; /**< Noise floor for LPC analysis */
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float folding_gain;
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const SpeexSubmode *submodes[SB_SUBMODES]; /**< Sub-mode data for the mode */
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int defaultSubmode; /**< Default sub-mode to use when encoding */
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int low_quality_map[11]; /**< Mode corresponding to each quality setting */
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int quality_map[11]; /**< Mode corresponding to each quality setting */
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const float (*vbr_thresh)[11];
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int nb_modes;
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} SpeexSBMode;
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int speex_encode_native(void *state, spx_word16_t *in, SpeexBits *bits);
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int speex_decode_native(void *state, SpeexBits *bits, spx_word16_t *out);
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int nb_mode_query(const void *mode, int request, void *ptr);
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int wb_mode_query(const void *mode, int request, void *ptr);
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#endif
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