/* Copyright (C) 2002-2006 Jean-Marc Valin */
/**
@file nb_celp.h
@brief Narrowband CELP encoder/decoder
*/
/*
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modification, are permitted provided that the following conditions
are met:
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contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef NB_CELP_H
#define NB_CELP_H
#include "modes.h"
#include <speex/speex_bits.h>
#include <speex/speex_callbacks.h>
#include "vbr.h"
#include "filters.h"
#ifdef VORBIS_PSYCHO
#include "vorbis_psy.h"
#endif
/**Structure representing the full state of the narrowband encoder*/
typedef struct EncState {
const SpeexMode *mode; /**< Mode corresponding to the state */
int first; /**< Is this the first frame? */
int frameSize; /**< Size of frames */
int subframeSize; /**< Size of sub-frames */
int nbSubframes; /**< Number of sub-frames */
int windowSize; /**< Analysis (LPC) window length */
int lpcSize; /**< LPC order */
int min_pitch; /**< Minimum pitch value allowed */
int max_pitch; /**< Maximum pitch value allowed */
spx_word32_t cumul_gain; /**< Product of previously used pitch gains (Q10) */
int bounded_pitch; /**< Next frame should not rely on previous frames for pitch */
int ol_pitch; /**< Open-loop pitch */
int ol_voiced; /**< Open-loop voiced/non-voiced decision */
int *pitch;
#ifdef VORBIS_PSYCHO
VorbisPsy *psy;
float *psy_window;
float *curve;
float *old_curve;
#endif
spx_word16_t gamma1; /**< Perceptual filter: A(z/gamma1) */
spx_word16_t gamma2; /**< Perceptual filter: A(z/gamma2) */
spx_word16_t lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/
char *stack; /**< Pseudo-stack allocation for temporary memory */
spx_word16_t *winBuf; /**< Input buffer (original signal) */
spx_word16_t *excBuf; /**< Excitation buffer */
spx_word16_t *exc; /**< Start of excitation frame */
spx_word16_t *swBuf; /**< Weighted signal buffer */
spx_word16_t *sw; /**< Start of weighted signal frame */
const spx_word16_t *window; /**< Temporary (Hanning) window */
const spx_word16_t *lagWindow; /**< Window applied to auto-correlation */
spx_lsp_t *old_lsp; /**< LSPs for previous frame */
spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
spx_mem_t *mem_sp; /**< Filter memory for signal synthesis */
spx_mem_t *mem_sw; /**< Filter memory for perceptually-weighted signal */
spx_mem_t *mem_sw_whole; /**< Filter memory for perceptually-weighted signal (whole frame)*/
spx_mem_t *mem_exc; /**< Filter memory for excitation (whole frame) */
spx_mem_t *mem_exc2; /**< Filter memory for excitation (whole frame) */
spx_mem_t mem_hp[2]; /**< High-pass filter memory */
spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
spx_word16_t *innov_rms_save; /**< If non-NULL, innovation RMS is copied here */
#ifndef DISABLE_VBR
VBRState *vbr; /**< State of the VBR data */
float vbr_quality; /**< Quality setting for VBR encoding */
float relative_quality; /**< Relative quality that will be needed by VBR */
spx_int32_t vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */
spx_int32_t vbr_max; /**< Max bit-rate allowed in VBR mode */
int vad_enabled; /**< 1 for enabling VAD, 0 otherwise */
int dtx_enabled; /**< 1 for enabling DTX, 0 otherwise */
int dtx_count; /**< Number of consecutive DTX frames */
spx_int32_t abr_enabled; /**< ABR setting (in bps), 0 if off */
float abr_drift;
float abr_drift2;
float abr_count;
#endif /* #ifndef DISABLE_VBR */
int complexity; /**< Complexity setting (0-10 from least complex to most complex) */
spx_int32_t sampling_rate;
int plc_tuning;
int encode_submode;
const SpeexSubmode * const *submodes; /**< Sub-mode data */
int submodeID; /**< Activated sub-mode */
int submodeSelect; /**< Mode chosen by the user (may differ from submodeID if VAD is on) */
int isWideband; /**< Is this used as part of the embedded wideband codec */
int highpass_enabled; /**< Is the input filter enabled */
} EncState;
/**Structure representing the full state of the narrowband decoder*/
typedef struct DecState {
const SpeexMode *mode; /**< Mode corresponding to the state */
int first; /**< Is this the first frame? */
int count_lost; /**< Was the last frame lost? */
int frameSize; /**< Size of frames */
int subframeSize; /**< Size of sub-frames */
int nbSubframes; /**< Number of sub-frames */
int lpcSize; /**< LPC order */
int min_pitch; /**< Minimum pitch value allowed */
int max_pitch; /**< Maximum pitch value allowed */
spx_int32_t sampling_rate;
spx_word16_t last_ol_gain; /**< Open-loop gain for previous frame */
char *stack; /**< Pseudo-stack allocation for temporary memory */
spx_word16_t *excBuf; /**< Excitation buffer */
spx_word16_t *exc; /**< Start of excitation frame */
spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */
spx_mem_t *mem_sp; /**< Filter memory for synthesis signal */
spx_mem_t mem_hp[2]; /**< High-pass filter memory */
spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
spx_word16_t *innov_save; /** If non-NULL, innovation is copied here */
spx_word16_t level;
spx_word16_t max_level;
spx_word16_t min_level;
/* This is used in packet loss concealment */
int last_pitch; /**< Pitch of last correctly decoded frame */
spx_word16_t last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
spx_word16_t pitch_gain_buf[3]; /**< Pitch gain of last decoded frames */
int pitch_gain_buf_idx; /**< Tail of the buffer */
spx_int32_t seed; /** Seed used for random number generation */
int encode_submode;
const SpeexSubmode * const *submodes; /**< Sub-mode data */
int submodeID; /**< Activated sub-mode */
int lpc_enh_enabled; /**< 1 when LPC enhancer is on, 0 otherwise */
SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
SpeexCallback user_callback;
/*Vocoder data*/
spx_word16_t voc_m1;
spx_word32_t voc_m2;
spx_word16_t voc_mean;
int voc_offset;
int dtx_enabled;
int isWideband; /**< Is this used as part of the embedded wideband codec */
int highpass_enabled; /**< Is the input filter enabled */
} DecState;
/** Initializes encoder state*/
void *nb_encoder_init(const SpeexMode *m);
/** De-allocates encoder state resources*/
void nb_encoder_destroy(void *state);
/** Encodes one frame*/
int nb_encode(void *state, void *in, SpeexBits *bits);
/** Initializes decoder state*/
void *nb_decoder_init(const SpeexMode *m);
/** De-allocates decoder state resources*/
void nb_decoder_destroy(void *state);
/** Decodes one frame*/
int nb_decode(void *state, SpeexBits *bits, void *out);
/** ioctl-like function for controlling a narrowband encoder */
int nb_encoder_ctl(void *state, int request, void *ptr);
/** ioctl-like function for controlling a narrowband decoder */
int nb_decoder_ctl(void *state, int request, void *ptr);
#endif