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203 lines
9.3 KiB
203 lines
9.3 KiB
5 years ago
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/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file nb_celp.h
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@brief Narrowband CELP encoder/decoder
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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 NB_CELP_H
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#define NB_CELP_H
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#include "modes.h"
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#include "speex_bits.h"
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#include "speex_callbacks.h"
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#include "vbr.h"
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#include "filters.h"
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/**Structure representing the full state of the narrowband encoder*/
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typedef struct EncState {
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SpeexMode *mode; /**< Mode corresponding to the state */
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int first; /**< Is this the first frame? */
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int frameSize; /**< Size of frames */
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int subframeSize; /**< Size of sub-frames */
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int nbSubframes; /**< Number of sub-frames */
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int windowSize; /**< Analysis (LPC) window length */
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int lpcSize; /**< LPC order */
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int bufSize; /**< Buffer size */
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int min_pitch; /**< Minimum pitch value allowed */
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int max_pitch; /**< Maximum pitch value allowed */
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int safe_pitch; /**< Don't use too large values for pitch (in case we lose a packet) */
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int bounded_pitch; /**< Next frame should not rely on previous frames for pitch */
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int ol_pitch; /**< Open-loop pitch */
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int ol_voiced; /**< Open-loop voiced/non-voiced decision */
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int *pitch;
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float gamma1; /**< Perceptual filter: A(z/gamma1) */
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float gamma2; /**< Perceptual filter: A(z/gamma2) */
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float lag_factor; /**< Lag windowing Gaussian width */
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float lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/
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float preemph; /**< Pre-emphasis: P(z) = 1 - a*z^-1*/
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float pre_mem; /**< 1-element memory for pre-emphasis */
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float pre_mem2; /**< 1-element memory for pre-emphasis */
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char *stack; /**< Pseudo-stack allocation for temporary memory */
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float *inBuf; /**< Input buffer (original signal) */
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float *frame; /**< Start of original frame */
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float *excBuf; /**< Excitation buffer */
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float *exc; /**< Start of excitation frame */
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float *exc2Buf; /**< "Pitch enhanced" excitation */
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float *exc2; /**< "Pitch enhanced" excitation */
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float *swBuf; /**< Weighted signal buffer */
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float *sw; /**< Start of weighted signal frame */
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float *innov; /**< Innovation for the frame */
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float *window; /**< Temporary (Hanning) window */
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float *buf2; /**< 2nd temporary buffer */
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float *autocorr; /**< auto-correlation */
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float *lagWindow; /**< Window applied to auto-correlation */
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float *lpc; /**< LPCs for current frame */
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float *lsp; /**< LSPs for current frame */
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float *qlsp; /**< Quantized LSPs for current frame */
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float *old_lsp; /**< LSPs for previous frame */
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float *old_qlsp; /**< Quantized LSPs for previous frame */
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float *interp_lsp; /**< Interpolated LSPs */
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float *interp_qlsp; /**< Interpolated quantized LSPs */
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float *interp_lpc; /**< Interpolated LPCs */
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float *interp_qlpc; /**< Interpolated quantized LPCs */
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float *bw_lpc1; /**< LPCs after bandwidth expansion by gamma1 for perceptual weighting*/
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float *bw_lpc2; /**< LPCs after bandwidth expansion by gamma2 for perceptual weighting*/
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float *rc; /**< Reflection coefficients */
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float *mem_sp; /**< Filter memory for signal synthesis */
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float *mem_sw; /**< Filter memory for perceptually-weighted signal */
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float *mem_sw_whole; /**< Filter memory for perceptually-weighted signal (whole frame)*/
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float *mem_exc; /**< Filter memory for excitation (whole frame) */
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float *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
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VBRState *vbr; /**< State of the VBR data */
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float vbr_quality; /**< Quality setting for VBR encoding */
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float relative_quality; /**< Relative quality that will be needed by VBR */
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int vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */
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int vad_enabled; /**< 1 for enabling VAD, 0 otherwise */
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int dtx_enabled; /**< 1 for enabling DTX, 0 otherwise */
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int dtx_count; /**< Number of consecutive DTX frames */
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int abr_enabled; /**< ABR setting (in bps), 0 if off */
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float abr_drift;
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float abr_drift2;
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float abr_count;
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int complexity; /**< Complexity setting (0-10 from least complex to most complex) */
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int sampling_rate;
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SpeexSubmode **submodes; /**< Sub-mode data */
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int submodeID; /**< Activated sub-mode */
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int submodeSelect; /**< Mode chosen by the user (may differ from submodeID if VAD is on) */
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} EncState;
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/**Structure representing the full state of the narrowband decoder*/
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typedef struct DecState {
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SpeexMode *mode; /**< Mode corresponding to the state */
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int first; /**< Is this the first frame? */
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int count_lost; /**< Was the last frame lost? */
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int frameSize; /**< Size of frames */
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int subframeSize; /**< Size of sub-frames */
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int nbSubframes; /**< Number of sub-frames */
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int windowSize; /**< Analysis (LPC) window length */
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int lpcSize; /**< LPC order */
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int bufSize; /**< Buffer size */
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int min_pitch; /**< Minimum pitch value allowed */
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int max_pitch; /**< Maximum pitch value allowed */
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int sampling_rate;
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float last_ol_gain; /**< Open-loop gain for previous frame */
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float gamma1; /**< Perceptual filter: A(z/gamma1) */
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float gamma2; /**< Perceptual filter: A(z/gamma2) */
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float preemph; /**< Pre-emphasis: P(z) = 1 - a*z^-1*/
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float pre_mem; /**< 1-element memory for pre-emphasis */
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char *stack; /**< Pseudo-stack allocation for temporary memory */
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float *inBuf; /**< Input buffer (original signal) */
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float *frame; /**< Start of original frame */
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float *excBuf; /**< Excitation buffer */
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float *exc; /**< Start of excitation frame */
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float *innov; /**< Innovation for the frame */
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float *qlsp; /**< Quantized LSPs for current frame */
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float *old_qlsp; /**< Quantized LSPs for previous frame */
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float *interp_qlsp; /**< Interpolated quantized LSPs */
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float *interp_qlpc; /**< Interpolated quantized LPCs */
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float *mem_sp; /**< Filter memory for synthesis signal */
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float *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
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int last_pitch; /**< Pitch of last correctly decoded frame */
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float last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
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float pitch_gain_buf[3]; /**< Pitch gain of last decoded frames */
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int pitch_gain_buf_idx; /**< Tail of the buffer */
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SpeexSubmode **submodes; /**< Sub-mode data */
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int submodeID; /**< Activated sub-mode */
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int lpc_enh_enabled; /**< 1 when LPC enhancer is on, 0 otherwise */
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CombFilterMem *comb_mem;
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SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
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SpeexCallback user_callback;
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/*Vocoder data*/
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float voc_m1;
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float voc_m2;
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float voc_mean;
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int voc_offset;
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int dtx_enabled;
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} DecState;
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/** Initializes encoder state*/
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void *nb_encoder_init(SpeexMode *m);
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/** De-allocates encoder state resources*/
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void nb_encoder_destroy(void *state);
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/** Encodes one frame*/
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int nb_encode(void *state, float *in, SpeexBits *bits);
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/** Initializes decoder state*/
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void *nb_decoder_init(SpeexMode *m);
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/** De-allocates decoder state resources*/
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void nb_decoder_destroy(void *state);
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/** Decodes one frame*/
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int nb_decode(void *state, SpeexBits *bits, float *out);
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/** ioctl-like function for controlling a narrowband encoder */
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int nb_encoder_ctl(void *state, int request, void *ptr);
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/** ioctl-like function for controlling a narrowband decoder */
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int nb_decoder_ctl(void *state, int request, void *ptr);
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#endif
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