forked from Mirrors/freeswitch
dced381e66
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3759 d0543943-73ff-0310-b7d9-9358b9ac24b2
206 lines
9.0 KiB
C
206 lines
9.0 KiB
C
/* Copyright (C) 2002-2006 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/speex_bits.h>
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#include <speex/speex_callbacks.h>
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#include "vbr.h"
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#include "filters.h"
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#ifdef VORBIS_PSYCHO
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#include "vorbis_psy.h"
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#endif
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/**Structure representing the full state of the narrowband encoder*/
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typedef struct EncState {
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const 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 min_pitch; /**< Minimum pitch value allowed */
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int max_pitch; /**< Maximum pitch value allowed */
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spx_word32_t cumul_gain; /**< Product of previously used pitch gains (Q10) */
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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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#ifdef EPIC_48K
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int lbr_48k;
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#endif
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#ifdef VORBIS_PSYCHO
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VorbisPsy *psy;
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float *psy_window;
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float *curve;
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float *old_curve;
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#endif
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spx_word16_t gamma1; /**< Perceptual filter: A(z/gamma1) */
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spx_word16_t gamma2; /**< Perceptual filter: A(z/gamma2) */
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float lag_factor; /**< Lag windowing Gaussian width */
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spx_word16_t lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/
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char *stack; /**< Pseudo-stack allocation for temporary memory */
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spx_word16_t *winBuf; /**< Input buffer (original signal) */
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spx_word16_t *excBuf; /**< Excitation buffer */
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spx_word16_t *exc; /**< Start of excitation frame */
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spx_word16_t *swBuf; /**< Weighted signal buffer */
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spx_word16_t *sw; /**< Start of weighted signal frame */
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const spx_word16_t *window; /**< Temporary (Hanning) window */
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spx_word16_t *lagWindow; /**< Window applied to auto-correlation */
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spx_lsp_t *old_lsp; /**< LSPs for previous frame */
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spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
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spx_mem_t *mem_sp; /**< Filter memory for signal synthesis */
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spx_mem_t *mem_sw; /**< Filter memory for perceptually-weighted signal */
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spx_mem_t *mem_sw_whole; /**< Filter memory for perceptually-weighted signal (whole frame)*/
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spx_mem_t *mem_exc; /**< Filter memory for excitation (whole frame) */
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spx_mem_t *mem_exc2; /**< Filter memory for excitation (whole frame) */
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spx_mem_t mem_hp[2]; /**< High-pass filter memory */
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spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
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spx_sig_t *innov_save; /**< If non-NULL, innovation is copied here */
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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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spx_int32_t vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */
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spx_int32_t vbr_max; /**< Max bit-rate allowed in VBR mode */
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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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spx_int32_t 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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spx_int32_t sampling_rate;
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int plc_tuning;
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int encode_submode;
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const SpeexSubmode * const *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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int isWideband; /**< Is this used as part of the embedded wideband codec */
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int highpass_enabled; /**< Is the input filter enabled */
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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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const 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 lpcSize; /**< LPC order */
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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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spx_int32_t sampling_rate;
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#ifdef EPIC_48K
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int lbr_48k;
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#endif
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spx_word16_t last_ol_gain; /**< Open-loop gain for previous frame */
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char *stack; /**< Pseudo-stack allocation for temporary memory */
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spx_word16_t *excBuf; /**< Excitation buffer */
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spx_word16_t *exc; /**< Start of excitation frame */
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spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
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spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */
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spx_mem_t *mem_sp; /**< Filter memory for synthesis signal */
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spx_mem_t mem_hp[2]; /**< High-pass filter memory */
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spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
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spx_sig_t *innov_save; /** If non-NULL, innovation is copied here */
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/* This is used in packet loss concealment */
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int last_pitch; /**< Pitch of last correctly decoded frame */
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spx_word16_t last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
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spx_word16_t 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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spx_int32_t seed; /** Seed used for random number generation */
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int encode_submode;
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const SpeexSubmode * const *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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SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
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SpeexCallback user_callback;
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/*Vocoder data*/
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spx_word16_t voc_m1;
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spx_word32_t 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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int isWideband; /**< Is this used as part of the embedded wideband codec */
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int highpass_enabled; /**< Is the input filter enabled */
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} DecState;
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/** Initializes encoder state*/
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void *nb_encoder_init(const 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, void *in, SpeexBits *bits);
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/** Initializes decoder state*/
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void *nb_decoder_init(const 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, void *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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