nb_celp.h
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上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:9k
源码类别:
Windows CE
开发平台:
C/C++
- /* Copyright (C) 2002 Jean-Marc Valin */
- /**
- @file nb_celp.h
- @brief Narrowband CELP encoder/decoder
- */
- /*
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- - Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- - Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- - Neither the name of the Xiph.org Foundation nor the names of its
- 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
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- 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"
- /**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 */
- int safe_pitch; /**< Don't use too large values for pitch (in case we lose a packet) */
- 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 EPIC_48K
- int lbr_48k;
- #endif
- spx_word16_t gamma1; /**< Perceptual filter: A(z/gamma1) */
- spx_word16_t gamma2; /**< Perceptual filter: A(z/gamma2) */
- float lag_factor; /**< Lag windowing Gaussian width */
- float lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/
- char *stack; /**< Pseudo-stack allocation for temporary memory */
- spx_sig_t *inBuf; /**< Input buffer (original signal) */
- spx_sig_t *frame; /**< Start of original frame */
- spx_sig_t *excBuf; /**< Excitation buffer */
- spx_sig_t *exc; /**< Start of excitation frame */
- spx_sig_t *swBuf; /**< Weighted signal buffer */
- spx_sig_t *sw; /**< Start of weighted signal frame */
- spx_sig_t *innov; /**< Innovation for the frame */
- spx_word16_t *window; /**< Temporary (Hanning) window */
- spx_word16_t *autocorr; /**< auto-correlation */
- spx_word16_t *lagWindow; /**< Window applied to auto-correlation */
- spx_coef_t *lpc; /**< LPCs for current frame */
- spx_lsp_t *lsp; /**< LSPs for current frame */
- spx_lsp_t *qlsp; /**< Quantized LSPs for current frame */
- spx_lsp_t *old_lsp; /**< LSPs for previous frame */
- spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
- spx_lsp_t *interp_lsp; /**< Interpolated LSPs */
- spx_lsp_t *interp_qlsp; /**< Interpolated quantized LSPs */
- spx_coef_t *interp_lpc; /**< Interpolated LPCs */
- spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */
- spx_coef_t *bw_lpc1; /**< LPCs after bandwidth expansion by gamma1 for perceptual weighting*/
- spx_coef_t *bw_lpc2; /**< LPCs after bandwidth expansion by gamma2 for perceptual weighting*/
- 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_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
- 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 */
- int vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */
- 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 */
- int abr_enabled; /**< ABR setting (in bps), 0 if off */
- float abr_drift;
- float abr_drift2;
- float abr_count;
- int complexity; /**< Complexity setting (0-10 from least complex to most complex) */
- int 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) */
- } 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 */
- int sampling_rate;
- #ifdef EPIC_48K
- int lbr_48k;
- #endif
- spx_word16_t last_ol_gain; /**< Open-loop gain for previous frame */
- char *stack; /**< Pseudo-stack allocation for temporary memory */
- spx_sig_t *inBuf; /**< Input buffer (original signal) */
- spx_sig_t *frame; /**< Start of original frame */
- spx_sig_t *excBuf; /**< Excitation buffer */
- spx_sig_t *exc; /**< Start of excitation frame */
- spx_sig_t *innov; /**< Innovation for the frame */
- spx_lsp_t *qlsp; /**< Quantized LSPs for current frame */
- spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
- spx_lsp_t *interp_qlsp; /**< Interpolated quantized LSPs */
- spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */
- spx_mem_t *mem_sp; /**< Filter memory for synthesis signal */
- spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
- 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 */
- CombFilterMem *comb_mem;
- SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
- SpeexCallback user_callback;
- /*Vocoder data*/
- float voc_m1;
- float voc_m2;
- float voc_mean;
- int voc_offset;
- int dtx_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