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Diffstat (limited to 'code/libspeex/nb_celp.h')
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1 files changed, 203 insertions, 0 deletions
diff --git a/code/libspeex/nb_celp.h b/code/libspeex/nb_celp.h new file mode 100644 index 0000000..14c776f --- /dev/null +++ b/code/libspeex/nb_celp.h @@ -0,0 +1,203 @@ +/* Copyright (C) 2002-2006 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" + +#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 |