1 /* Copyright (C) 2002-2006 Jean-Marc Valin */
4 @brief Narrowband CELP encoder/decoder
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40 #include <speex/speex_bits.h>
41 #include <speex/speex_callbacks.h>
46 #include "vorbis_psy.h"
49 /**Structure representing the full state of the narrowband encoder*/
50 typedef struct EncState {
51 const SpeexMode *mode; /**< Mode corresponding to the state */
52 int first; /**< Is this the first frame? */
53 int frameSize; /**< Size of frames */
54 int subframeSize; /**< Size of sub-frames */
55 int nbSubframes; /**< Number of sub-frames */
56 int windowSize; /**< Analysis (LPC) window length */
57 int lpcSize; /**< LPC order */
58 int min_pitch; /**< Minimum pitch value allowed */
59 int max_pitch; /**< Maximum pitch value allowed */
61 spx_word32_t cumul_gain; /**< Product of previously used pitch gains (Q10) */
62 int bounded_pitch; /**< Next frame should not rely on previous frames for pitch */
63 int ol_pitch; /**< Open-loop pitch */
64 int ol_voiced; /**< Open-loop voiced/non-voiced decision */
74 spx_word16_t gamma1; /**< Perceptual filter: A(z/gamma1) */
75 spx_word16_t gamma2; /**< Perceptual filter: A(z/gamma2) */
76 spx_word16_t lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/
77 char *stack; /**< Pseudo-stack allocation for temporary memory */
78 spx_word16_t *winBuf; /**< Input buffer (original signal) */
79 spx_word16_t *excBuf; /**< Excitation buffer */
80 spx_word16_t *exc; /**< Start of excitation frame */
81 spx_word16_t *swBuf; /**< Weighted signal buffer */
82 spx_word16_t *sw; /**< Start of weighted signal frame */
83 const spx_word16_t *window; /**< Temporary (Hanning) window */
84 const spx_word16_t *lagWindow; /**< Window applied to auto-correlation */
85 spx_lsp_t *old_lsp; /**< LSPs for previous frame */
86 spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
87 spx_mem_t *mem_sp; /**< Filter memory for signal synthesis */
88 spx_mem_t *mem_sw; /**< Filter memory for perceptually-weighted signal */
89 spx_mem_t *mem_sw_whole; /**< Filter memory for perceptually-weighted signal (whole frame)*/
90 spx_mem_t *mem_exc; /**< Filter memory for excitation (whole frame) */
91 spx_mem_t *mem_exc2; /**< Filter memory for excitation (whole frame) */
92 spx_mem_t mem_hp[2]; /**< High-pass filter memory */
93 spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
94 spx_word16_t *innov_rms_save; /**< If non-NULL, innovation RMS is copied here */
97 VBRState *vbr; /**< State of the VBR data */
98 float vbr_quality; /**< Quality setting for VBR encoding */
99 float relative_quality; /**< Relative quality that will be needed by VBR */
100 spx_int32_t vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */
101 spx_int32_t vbr_max; /**< Max bit-rate allowed in VBR mode */
102 int vad_enabled; /**< 1 for enabling VAD, 0 otherwise */
103 int dtx_enabled; /**< 1 for enabling DTX, 0 otherwise */
104 int dtx_count; /**< Number of consecutive DTX frames */
105 spx_int32_t abr_enabled; /**< ABR setting (in bps), 0 if off */
109 #endif /* #ifndef DISABLE_VBR */
111 int complexity; /**< Complexity setting (0-10 from least complex to most complex) */
112 spx_int32_t sampling_rate;
115 const SpeexSubmode * const *submodes; /**< Sub-mode data */
116 int submodeID; /**< Activated sub-mode */
117 int submodeSelect; /**< Mode chosen by the user (may differ from submodeID if VAD is on) */
118 int isWideband; /**< Is this used as part of the embedded wideband codec */
119 int highpass_enabled; /**< Is the input filter enabled */
122 /**Structure representing the full state of the narrowband decoder*/
123 typedef struct DecState {
124 const SpeexMode *mode; /**< Mode corresponding to the state */
125 int first; /**< Is this the first frame? */
126 int count_lost; /**< Was the last frame lost? */
127 int frameSize; /**< Size of frames */
128 int subframeSize; /**< Size of sub-frames */
129 int nbSubframes; /**< Number of sub-frames */
130 int lpcSize; /**< LPC order */
131 int min_pitch; /**< Minimum pitch value allowed */
132 int max_pitch; /**< Maximum pitch value allowed */
133 spx_int32_t sampling_rate;
135 spx_word16_t last_ol_gain; /**< Open-loop gain for previous frame */
137 char *stack; /**< Pseudo-stack allocation for temporary memory */
138 spx_word16_t *excBuf; /**< Excitation buffer */
139 spx_word16_t *exc; /**< Start of excitation frame */
140 spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
141 spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */
142 spx_mem_t *mem_sp; /**< Filter memory for synthesis signal */
143 spx_mem_t mem_hp[2]; /**< High-pass filter memory */
144 spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
145 spx_word16_t *innov_save; /** If non-NULL, innovation is copied here */
148 spx_word16_t max_level;
149 spx_word16_t min_level;
151 /* This is used in packet loss concealment */
152 int last_pitch; /**< Pitch of last correctly decoded frame */
153 spx_word16_t last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
154 spx_word16_t pitch_gain_buf[3]; /**< Pitch gain of last decoded frames */
155 int pitch_gain_buf_idx; /**< Tail of the buffer */
156 spx_int32_t seed; /** Seed used for random number generation */
159 const SpeexSubmode * const *submodes; /**< Sub-mode data */
160 int submodeID; /**< Activated sub-mode */
161 int lpc_enh_enabled; /**< 1 when LPC enhancer is on, 0 otherwise */
162 SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
164 SpeexCallback user_callback;
169 spx_word16_t voc_mean;
173 int isWideband; /**< Is this used as part of the embedded wideband codec */
174 int highpass_enabled; /**< Is the input filter enabled */
177 /** Initializes encoder state*/
178 void *nb_encoder_init(const SpeexMode *m);
180 /** De-allocates encoder state resources*/
181 void nb_encoder_destroy(void *state);
183 /** Encodes one frame*/
184 int nb_encode(void *state, void *in, SpeexBits *bits);
187 /** Initializes decoder state*/
188 void *nb_decoder_init(const SpeexMode *m);
190 /** De-allocates decoder state resources*/
191 void nb_decoder_destroy(void *state);
193 /** Decodes one frame*/
194 int nb_decode(void *state, SpeexBits *bits, void *out);
196 /** ioctl-like function for controlling a narrowband encoder */
197 int nb_encoder_ctl(void *state, int request, void *ptr);
199 /** ioctl-like function for controlling a narrowband decoder */
200 int nb_decoder_ctl(void *state, int request, void *ptr);