enc_main.c
上传用户:dangjiwu
上传日期:2013-07-19
资源大小:42019k
文件大小:42k
- /*
- *===================================================================
- * 3GPP AMR Wideband Floating-point Speech Codec
- *===================================================================
- */
- #include <stdlib.h>
- #include "hlxclib/memory.h"
- #include <math.h>
- #include <float.h>
- #include <string.h>
- #include <stdio.h>
- #include "enc_dtx.h"
- #include "enc_acelp.h"
- #include "enc_lpc.h"
- #include "enc_main.h"
- #include "enc_gain.h"
- #include "enc_util.h"
- #ifdef WIN32
- #pragma warning( disable : 4310)
- #endif
- #include "typedef.h"
- #define MAX_16 (Word16)0x7fff
- #define MIN_16 (Word16)0x8000
- #define Q_MAX 8 /* scaling max for signal */
- #define PREEMPH_FAC 0.68F /* preemphasis factor */
- #define GAMMA1 0.92F /* Weighting factor (numerator) */
- #define TILT_FAC 0.68F /* tilt factor (denominator) */
- #define PIT_MIN 34 /* Minimum pitch lag with resolution 1/4 */
- #define PIT_FR2 128 /* Minimum pitch lag with resolution 1/2 */
- #define PIT_FR1_9b 160 /* Minimum pitch lag with resolution 1 */
- #define PIT_FR1_8b 92 /* Minimum pitch lag with resolution 1 */
- #define PIT_MAX 231 /* Maximum pitch lag */
- #define L_INTERPOL (16+1) /* Length of filter for interpolation */
- #define L_FRAME16k 320 /* Frame size at 16kHz */
- #define L_SUBFR 64 /* Subframe size */
- #define NB_SUBFR 4 /* Number of subframe per frame */
- #define L_FILT 12 /* Delay of up-sampling filter */
- #define L_NEXT 64 /* Overhead in LP analysis */
- #define MODE_7k 0 /* modes */
- #define MODE_9k 1
- #define MODE_12k 2
- #define MODE_14k 3
- #define MODE_16k 4
- #define MODE_18k 5
- #define MODE_20k 6
- #define MODE_23k 7
- #define MODE_24k 8
- #define MRDTX 10
- extern const Word16 E_ROM_isp[];
- extern const Word16 E_ROM_isf[];
- extern const Word16 E_ROM_interpol_frac[];
- /*
- * E_MAIN_reset
- *
- * Parameters:
- * st I/O: pointer to state structure
- * reset_all I: perform full reset
- *
- * Function:
- * Initialisation of variables for the coder section.
- *
- *
- * Returns:
- * void
- */
- void E_MAIN_reset(void *st, Word16 reset_all)
- {
- Word32 i;
- Coder_State *cod_state;
- cod_state = (Coder_State *) st;
- memset(cod_state->mem_exc, 0, (PIT_MAX + L_INTERPOL) * sizeof(Word16));
- memset(cod_state->mem_isf_q, 0, M * sizeof(Word16));
- memset(cod_state->mem_syn, 0, M * sizeof(Float32));
- cod_state->mem_w0 = 0.0F;
- cod_state->mem_tilt_code = 0;
- cod_state->mem_first_frame = 1;
- E_GAIN_clip_init(cod_state->mem_gp_clip);
- cod_state->mem_gc_threshold = 0.0F;
- if (reset_all != 0)
- {
- /* Set static vectors to zero */
- memset(cod_state->mem_speech, 0, (L_TOTAL - L_FRAME) * sizeof(Float32));
- memset(cod_state->mem_wsp, 0, (PIT_MAX / OPL_DECIM) * sizeof(Float32));
- memset(cod_state->mem_decim2, 0, 3 * sizeof(Float32));
- /* routines initialization */
- memset(cod_state->mem_decim, 0, 2 * L_FILT16k * sizeof(Float32));
- memset(cod_state->mem_sig_in, 0, 4 * sizeof(Float32));
- E_ACELP_Gain2_Q_init(cod_state->mem_gain_q);
- memset(cod_state->mem_hf_wsp, 0, 8 * sizeof(Float32));
- /* isp initialization */
- for (i = 0; i < M - 1; i++)
- {
- cod_state->mem_isp[i] =
- (Float32)cos(3.141592654 * (Float32)(i + 1) / (Float32)M);
- }
- cod_state->mem_isp[M - 1] = 0.045F;
- memcpy(cod_state->mem_isp_q, E_ROM_isp, M * sizeof(Word16));
- /* variable initialization */
- cod_state->mem_preemph = 0.0F;
- cod_state->mem_wsp_df = 0.0F;
- cod_state->mem_q = Q_MAX;
- cod_state->mem_subfr_q[3] = Q_MAX;
- cod_state->mem_subfr_q[2] = Q_MAX;
- cod_state->mem_subfr_q[1] = Q_MAX;
- cod_state->mem_subfr_q[0] = Q_MAX;
- cod_state->mem_ada_w = 0.0F;
- cod_state->mem_ol_gain = 0.0F;
- cod_state->mem_ol_wght_flg = 0;
- for (i = 0; i < 5; i++)
- {
- cod_state->mem_ol_lag[i] = 40;
- }
- cod_state->mem_T0_med = 40;
- memset(cod_state->mem_hp_wsp, 0,
- ( ( L_FRAME / 2 ) / OPL_DECIM + ( PIT_MAX / OPL_DECIM ) )
- * sizeof(Float32) );
- memset(cod_state->mem_syn_hf, 0, M * sizeof(Float32));
- memset(cod_state->mem_syn2, 0, M * sizeof(Float32));
- memset(cod_state->mem_hp400, 0, 4 * sizeof(Float32));
- memset(cod_state->mem_sig_out, 0, 4 * sizeof(Float32));
- memset(cod_state->mem_hf, 0, 2 * L_FILT16k * sizeof(Float32));
- memset(cod_state->mem_hf2, 0, 2 * L_FILT16k * sizeof(Float32));
- memset(cod_state->mem_hf3, 0, 2 * L_FILT16k * sizeof(Float32));
- memcpy(cod_state->mem_isf, E_ROM_isf, M * sizeof(Float32));
- cod_state->mem_deemph = 0.0F;
- cod_state->mem_seed = 21845;
- cod_state->mem_gain_alpha = 1.0F;
- cod_state->mem_vad_hist = 0;
- E_DTX_reset(cod_state->dtx_encSt);
- E_DTX_vad_reset(cod_state->vadSt);
- }
- }
- /*
- * E_MAIN_init
- *
- * Parameters:
- * spe_state I/O: pointer to state structure
- *
- * Function:
- * Initialisation of variables for the coder section.
- * Memory allocation.
- *
- * Returns:
- * void
- */
- Word16 E_MAIN_init(void **spe_state)
- {
- Coder_State *st;
- *spe_state = NULL;
- /* allocate memory */
- if ((st = (Coder_State *) malloc(sizeof(Coder_State))) == NULL)
- {
- return(-1);
- }
- st->vadSt = NULL;
- st->dtx_encSt = NULL;
- E_DTX_init(&(st->dtx_encSt));
- E_DTX_vad_init(&(st->vadSt));
- E_MAIN_reset((void *) st, 1);
- *spe_state = (void*)st;
- return(0);
- }
- /*
- * E_MAIN_close
- *
- *
- * Parameters:
- * spe_state I: pointer to state structure
- *
- * Function:
- * Free coder memory.
- *
- *
- * Returns:
- * void
- */
- void E_MAIN_close(void **spe_state)
- {
- E_DTX_exit(&( ( (Coder_State *)(*spe_state) )->dtx_encSt));
- E_DTX_vad_exit(&( ( (Coder_State *) (*spe_state) )->vadSt));
- free(*spe_state);
- return;
- }
- /*
- * E_MAIN_parm_store
- *
- * Parameters:
- * value I: parameter value
- * prms O: output parameters
- *
- * Function:
- * Store parameter values
- *
- * Returns:
- * void
- */
- static void E_MAIN_parm_store(Word32 value, Word16 **prms)
- {
- **prms = (Word16)value;
- (*prms)++;
- return;
- }
- /*
- * E_MAIN_encode
- *
- * Parameters:
- * mode I: used mode
- * input_sp I: 320 new speech samples (at 16 kHz)
- * prms O: output parameters
- * spe_state B: state structure
- * allow_dtx I: DTX ON/OFF
- *
- * Function:
- * Main coder routine.
- *
- * Returns:
- * void
- */
- Word16 E_MAIN_encode(Word16 * mode, Word16 speech16k[], Word16 prms[],
- void *spe_state, Word16 allow_dtx)
- {
- /* Float32 */
- Float32 f_speech16k[L_FRAME16k]; /* Speech vector */
- Float32 f_old_exc[(L_FRAME + 1) + PIT_MAX + L_INTERPOL]; /* Excitation vector */
- Float32 f_exc2[L_FRAME]; /* excitation vector */
- Float32 error[M + L_SUBFR]; /* error of quantization */
- Float32 A[NB_SUBFR * (M + 1)]; /* A(z) unquantized for the 4 subframes */
- Float32 Aq[NB_SUBFR * (M + 1)]; /* A(z) quantized for the 4 subframes */
- Float32 xn[L_SUBFR]; /* Target vector for pitch search */
- Float32 xn2[L_SUBFR]; /* Target vector for codebook search */
- Float32 dn[L_SUBFR]; /* Correlation between xn2 and h1 */
- Float32 cn[L_SUBFR]; /* Target vector in residual domain */
- Float32 h1[L_SUBFR]; /* Impulse response vector */
- Float32 f_code[L_SUBFR]; /* Fixed codebook excitation */
- Float32 y1[L_SUBFR]; /* Filtered adaptive excitation */
- Float32 y2[L_SUBFR]; /* Filtered adaptive excitation */
- Float32 synth[L_SUBFR]; /* 12.8kHz synthesis vector */
- Float32 r[M + 1]; /* Autocorrelations of windowed speech */
- Float32 Ap[M + 1]; /* A(z) with spectral expansion */
- Float32 ispnew[M]; /* immittance spectral pairs at 4nd sfr */
- Float32 isf[M]; /* ISF (frequency domain) at 4nd sfr */
- Float32 g_coeff[5], g_coeff2[2]; /* Correlations */
- Float32 gain_pit;
- Float32 f_tmp, gain1, gain2;
- Float32 stab_fac = 0.0F, fac;
- Float32 *new_speech, *speech; /* Speech vector */
- Float32 *wsp; /* Weighted speech vector */
- Float32 *f_exc; /* Excitation vector */
- Float32 *p_A, *p_Aq; /* ptr to A(z) for the 4 subframes */
- Float32 *f_pt_tmp;
- /* Word32 */
- Word32 indice[8]; /* quantization indices */
- Word32 vad_flag, clip_gain;
- Word32 T_op, T_op2, T0, T0_frac;
- Word32 T0_min, T0_max;
- Word32 voice_fac, Q_new = 0;
- Word32 L_gain_code, l_tmp;
- Word32 i, i_subfr, pit_flag;
- /* Word16 */
- Word16 exc2[L_FRAME]; /* excitation vector */
- Word16 s_Aq[NB_SUBFR * (M + 1)]; /* A(z) quantized for the 4 subframes */
- Word16 s_code[L_SUBFR]; /* Fixed codebook excitation */
- Word16 ispnew_q[M]; /* quantized ISPs at 4nd subframe */
- Word16 isfq[M]; /* quantized ISPs */
- Word16 select, codec_mode;
- Word16 index;
- Word16 s_gain_pit, gain_code;
- Word16 s_tmp, s_max;
- Word16 corr_gain;
- Word16 *exc; /* Excitation vector */
- /* Other */
- Coder_State *st; /* Coder states */
- st = (Coder_State *)spe_state;
- codec_mode = *mode;
- /*
- * Initialize pointers to speech vector.
- *
- *
- * |-------|-------|-------|-------|-------|-------|
- * past sp sf1 sf2 sf3 sf4 L_NEXT
- * <------- Total speech buffer (L_TOTAL) ------>
- * old_speech
- * <------- LPC analysis window (L_WINDOW) ------>
- * <-- present frame (L_FRAME) ---->
- * | <----- new speech (L_FRAME) ---->
- * | |
- * speech |
- * new_speech
- */
- new_speech = st->mem_speech + L_TOTAL - L_FRAME - L_FILT; /* New speech */
- speech = st->mem_speech + L_TOTAL - L_FRAME - L_NEXT; /* Present frame */
- exc = st->mem_exc + PIT_MAX + L_INTERPOL;
- f_exc = f_old_exc + PIT_MAX + L_INTERPOL;
- wsp = st->mem_wsp + (PIT_MAX / OPL_DECIM);
- for(i = 0; i < L_FRAME16k; i++)
- {
- f_speech16k[i] = (Float32)speech16k[i];
- }
- Q_new = -st->mem_q;
- for(i = 0; i < (PIT_MAX + L_INTERPOL); i++)
- {
- f_old_exc[i] = (Float32)(st->mem_exc[i] * pow(2, Q_new));
- }
- /*
- * Down sampling signal from 16kHz to 12.8kHz
- */
- E_UTIL_decim_12k8(f_speech16k, L_FRAME16k, new_speech, st->mem_decim);
- /* decimate with zero-padding to avoid delay of filter */
- memcpy(f_code, st->mem_decim, 2 * L_FILT16k * sizeof(Float32));
- memset(error, 0, L_FILT16k * sizeof(Float32));
- E_UTIL_decim_12k8(error, L_FILT16k, new_speech + L_FRAME, f_code);
- /*
- * Perform 50Hz HP filtering of input signal.
- * Perform fixed preemphasis through 1 - g z^-1
- */
- E_UTIL_hp50_12k8(new_speech, L_FRAME, st->mem_sig_in);
- memcpy(f_code, st->mem_sig_in, 4 * sizeof(Float32) );
- E_UTIL_hp50_12k8(new_speech + L_FRAME, L_FILT, f_code);
- E_UTIL_f_preemph(new_speech, PREEMPH_FAC, L_FRAME, &(st->mem_preemph));
- /* last L_FILT samples for autocorrelation window */
- f_tmp = st->mem_preemph;
- E_UTIL_f_preemph(new_speech + L_FRAME, PREEMPH_FAC, L_FILT, &f_tmp);
- /*
- * Call VAD
- * Preemphesis scale down signal in low frequency and keep dynamic in HF.
- * Vad work slightly in futur (new_speech = speech + L_NEXT - L_FILT).
- */
- vad_flag = E_DTX_vad(st->vadSt, new_speech);
- if (vad_flag == 0)
- {
- st->mem_vad_hist = 1;
- }
- else
- {
- st->mem_vad_hist = 0;
- }
- /* DTX processing */
- if (allow_dtx)
- {
- /* Note that mode may change here */
- E_DTX_tx_handler(st->dtx_encSt, vad_flag, mode);
- }
- else
- {
- E_DTX_reset(st->dtx_encSt);
- }
- if(*mode != MRDTX)
- {
- E_MAIN_parm_store(vad_flag, &prms);
- }
- /*
- * Perform LPC analysis
- * --------------------
- * - autocorrelation + lag windowing
- * - Levinson-durbin algorithm to find a[]
- * - convert a[] to isp[]
- * - convert isp[] to isf[] for quantization
- * - quantize and code the isf[]
- * - convert isf[] to isp[] for interpolation
- * - find the interpolated isps and convert to a[] for the 4 subframes
- */
- /* LP analysis centered at 3nd subframe */
- E_UTIL_autocorr(st->mem_speech, r);
- E_LPC_lag_wind(r + 1, M); /* Lag windowing */
- E_LPC_lev_dur(A, r, M);
- E_LPC_a_isp_conversion(A, ispnew, st->mem_isp, M); /* From A(z) to isp */
- /* Find the interpolated isps and convert to a[] for all subframes */
- E_LPC_f_int_isp_find(st->mem_isp, ispnew, A, NB_SUBFR, M);
- /* update isp memory for the next frame */
- memcpy(st->mem_isp, ispnew, M * sizeof(Float32));
- /* Convert isps to frequency domain 0..6400 */
- E_LPC_isp_isf_conversion(ispnew, isf, M);
- /* check resonance for pitch clipping algorithm */
- E_GAIN_clip_isf_test(isf, st->mem_gp_clip);
- /*
- * Perform PITCH_OL analysis
- * -------------------------
- * - Find the residual res[] for the whole speech frame
- * - Find the weighted input speech wsp[] for the whole speech frame
- * - Find the 2 open-loop pitch estimate
- * - Set the range for searching closed-loop pitch in 1st subframe
- */
- p_A = A;
- for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
- {
- E_LPC_a_weight(p_A, Ap, GAMMA1, M);
- E_UTIL_residu(Ap, &speech[i_subfr], &wsp[i_subfr], L_SUBFR);
- p_A += (M + 1);
- }
- E_UTIL_deemph(wsp, TILT_FAC, L_FRAME, &(st->mem_wsp_df));
- /* decimation of wsp[] to search pitch in LF and to reduce complexity */
- E_GAIN_lp_decim2(wsp, L_FRAME, st->mem_decim2);
- /* Find open loop pitch lag for whole speech frame */
- if (*mode == MODE_7k)
- {
- /* Find open loop pitch lag for whole speech frame */
- T_op = E_GAIN_open_loop_search(wsp, PIT_MIN / OPL_DECIM,
- PIT_MAX / OPL_DECIM, L_FRAME / OPL_DECIM, st->mem_T0_med,
- &(st->mem_ol_gain), st->mem_hf_wsp, st->mem_hp_wsp,
- st->mem_ol_wght_flg);
- }
- else
- {
- /* Find open loop pitch lag for first 1/2 frame */
- T_op = E_GAIN_open_loop_search(wsp, PIT_MIN / OPL_DECIM,
- PIT_MAX / OPL_DECIM, (L_FRAME / 2) / OPL_DECIM, st->mem_T0_med,
- &(st->mem_ol_gain), st->mem_hf_wsp, st->mem_hp_wsp,
- st->mem_ol_wght_flg);
- }
- if (st->mem_ol_gain > 0.6)
- {
- st->mem_T0_med = E_GAIN_olag_median(T_op, st->mem_ol_lag);
- st->mem_ada_w = 1.0F;
- }
- else
- {
- st->mem_ada_w = st->mem_ada_w * 0.9F;
- }
- if (st->mem_ada_w < 0.8)
- {
- st->mem_ol_wght_flg = 0;
- }
- else
- {
- st->mem_ol_wght_flg = 1;
- }
- E_DTX_pitch_tone_detection(st->vadSt, st->mem_ol_gain);
- T_op *= OPL_DECIM;
- if (*mode != MODE_7k)
- {
- /* Find open loop pitch lag for second 1/2 frame */
- T_op2 = E_GAIN_open_loop_search(wsp + ((L_FRAME / 2) / OPL_DECIM),
- PIT_MIN / OPL_DECIM, PIT_MAX / OPL_DECIM, (L_FRAME / 2) / OPL_DECIM,
- st->mem_T0_med, &st->mem_ol_gain, st->mem_hf_wsp, st->mem_hp_wsp,
- st->mem_ol_wght_flg);
- if (st->mem_ol_gain > 0.6)
- {
- st->mem_T0_med = E_GAIN_olag_median(T_op2, st->mem_ol_lag);
- st->mem_ada_w = 1.0F;
- }
- else
- {
- st->mem_ada_w = st->mem_ada_w * 0.9F;
- }
- if (st->mem_ada_w < 0.8)
- {
- st->mem_ol_wght_flg = 0;
- }
- else
- {
- st->mem_ol_wght_flg = 1;
- }
- E_DTX_pitch_tone_detection(st->vadSt, st->mem_ol_gain);
- T_op2 *= OPL_DECIM;
- }
- else
- {
- T_op2 = T_op;
- }
- /*
- * DTX-CNG
- */
- if(*mode == MRDTX)
- {
- /* Buffer isf's and energy */
- E_UTIL_residu(&A[3 * (M + 1)], speech, f_exc, L_FRAME);
- f_tmp = 0.0;
- for(i = 0; i < L_FRAME; i++)
- {
- f_tmp += f_exc[i] * f_exc[i];
- }
- E_DTX_buffer(st->dtx_encSt, isf, f_tmp, codec_mode);
- /* Quantize and code the isfs */
- E_DTX_exe(st->dtx_encSt, f_exc2, &prms);
- /* reset speech coder memories */
- E_MAIN_reset(st, 0);
- /*
- * Update signal for next frame.
- * -> save past of speech[] and wsp[].
- */
- memcpy(st->mem_speech, &st->mem_speech[L_FRAME],
- (L_TOTAL - L_FRAME) * sizeof(Float32));
- memcpy(st->mem_wsp, &st->mem_wsp[L_FRAME / OPL_DECIM],
- (PIT_MAX / OPL_DECIM) * sizeof(Float32));
- return(0);
- }
- /*
- * ACELP
- */
- /* Quantize and code the isfs */
- if (*mode <= MODE_7k)
- {
- E_LPC_isf_2s3s_quantise(isf, isfq, st->mem_isf_q, indice, 4);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- E_MAIN_parm_store((Word16)indice[4], &prms);
- }
- else
- {
- E_LPC_isf_2s5s_quantise(isf, isfq, st->mem_isf_q, indice, 4);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- E_MAIN_parm_store((Word16)indice[4], &prms);
- E_MAIN_parm_store((Word16)indice[5], &prms);
- E_MAIN_parm_store((Word16)indice[6], &prms);
- }
- /* Convert isfs to the cosine domain */
- E_LPC_isf_isp_conversion(isfq, ispnew_q, M);
- if (*mode == MODE_24k)
- {
- /* Check stability on isf : distance between old isf and current isf */
- f_tmp = 0.0F;
- f_pt_tmp = st->mem_isf;
- for (i=0; i < M - 1; i++)
- {
- f_tmp += (isf[i] - f_pt_tmp[i]) * (isf[i] - f_pt_tmp[i]);
- }
- stab_fac = (Float32)(1.25F - (f_tmp / 400000.0F));
- if (stab_fac > 1.0F)
- {
- stab_fac = 1.0F;
- }
- if (stab_fac < 0.0F)
- {
- stab_fac = 0.0F;
- }
- memcpy(f_pt_tmp, isf, M * sizeof(Float32));
- }
- if (st->mem_first_frame == 1)
- {
- st->mem_first_frame = 0;
- memcpy(st->mem_isp_q, ispnew_q, M * sizeof(Word16));
- }
- /* Find the interpolated isps and convert to a[] for all subframes */
- E_LPC_int_isp_find(st->mem_isp_q, ispnew_q, E_ROM_interpol_frac, s_Aq);
- for (i = 0; i < (NB_SUBFR * (M + 1)); i++)
- {
- Aq[i] = s_Aq[i] * 0.000244140625F; /* 1/4096 */
- }
- /* update isp memory for the next frame */
- memcpy(st->mem_isp_q, ispnew_q, M * sizeof(Word16));
- /*
- * Find the best interpolation for quantized ISPs
- */
- p_Aq = Aq;
- for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
- {
- E_UTIL_residu(p_Aq, &speech[i_subfr], &f_exc[i_subfr], L_SUBFR);
- p_Aq += (M + 1);
- }
- /* Buffer isf's and energy for dtx on non-speech frame */
- if(vad_flag == 0)
- {
- f_tmp = 0.0F;
- for(i = 0; i < L_FRAME; i++)
- {
- f_tmp += f_exc[i] * f_exc[i];
- }
- E_DTX_buffer(st->dtx_encSt, isf, f_tmp, codec_mode);
- }
- /* range for closed loop pitch search in 1st subframe */
- T0_min = T_op - 8;
- if (T0_min < PIT_MIN)
- {
- T0_min = PIT_MIN;
- }
- T0_max = T0_min + 15;
- if (T0_max > PIT_MAX)
- {
- T0_max = PIT_MAX;
- T0_min = T0_max - 15;
- }
- /*
- * Loop for every subframe in the analysis frame
- * ---------------------------------------------
- * To find the pitch and innovation parameters. The subframe size is
- * L_SUBFR and the loop is repeated L_FRAME/L_SUBFR times.
- * - compute the target signal for pitch search
- * - compute impulse response of weighted synthesis filter (h1[])
- * - find the closed-loop pitch parameters
- * - encode the pitch dealy
- * - find 2 lt prediction (with / without LP filter for lt pred)
- * - find 2 pitch gains and choose the best lt prediction.
- * - find target vector for codebook search
- * - update the impulse response h1[] for codebook search
- * - correlation between target vector and impulse response
- * - codebook search and encoding
- * - VQ of pitch and codebook gains
- * - find voicing factor and tilt of code for next subframe.
- * - update states of weighting filter
- * - find excitation and synthesis speech
- */
- p_A = A;
- p_Aq = Aq;
- for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
- {
- pit_flag = i_subfr;
- if ((i_subfr == (2 * L_SUBFR)) & (*mode > MODE_7k))
- {
- pit_flag = 0;
- /* range for closed loop pitch search in 3rd subframe */
- T0_min = T_op2 - 8;
- if (T0_min < PIT_MIN)
- {
- T0_min = PIT_MIN;
- }
- T0_max = T0_min + 15;
- if (T0_max > PIT_MAX)
- {
- T0_max = PIT_MAX;
- T0_min = T0_max - 15;
- }
- }
- /*
- *
- * Find the target vector for pitch search:
- * ---------------------------------------
- *
- * |------| res[n]
- * speech[n]---| A(z) |--------
- * |------| | |--------| error[n] |------|
- * zero -- (-)--| 1/A(z) |-----------| W(z) |-- target
- * exc |--------| |------|
- *
- * Instead of subtracting the zero-input response of filters from
- * the weighted input speech, the above configuration is used to
- * compute the target vector.
- *
- */
- for (i = 0; i < M; i++)
- {
- error[i] = (Float32)(speech[i + i_subfr - 16] - st->mem_syn[i]);
- }
- E_UTIL_residu(p_Aq, &speech[i_subfr], &f_exc[i_subfr], L_SUBFR);
- E_UTIL_synthesis(p_Aq, &f_exc[i_subfr], error + M, L_SUBFR, error, 0);
- E_LPC_a_weight(p_A, Ap, GAMMA1, M);
- E_UTIL_residu(Ap, error + M, xn, L_SUBFR);
- E_UTIL_deemph(xn, TILT_FAC, L_SUBFR, &(st->mem_w0));
- /*
- * Find target in residual domain (cn[]) for innovation search.
- */
- /* first half: xn[] --> cn[] */
- memset(f_code, 0, M * sizeof(Float32));
- memcpy(f_code + M, xn, (L_SUBFR / 2) * sizeof(Float32));
- f_tmp = 0.0F;
- E_UTIL_f_preemph(f_code + M, TILT_FAC, L_SUBFR / 2, &f_tmp);
- E_LPC_a_weight(p_A, Ap, GAMMA1, M);
- E_UTIL_synthesis(Ap, f_code + M, f_code + M, L_SUBFR / 2, f_code, 0);
- E_UTIL_residu(p_Aq, f_code + M, cn, L_SUBFR / 2);
- /* second half: res[] --> cn[] (approximated and faster) */
- for(i = (L_SUBFR / 2); i < L_SUBFR; i++)
- {
- cn[i] = f_exc[i_subfr + i];
- }
- /*
- * Compute impulse response, h1[], of weighted synthesis filter
- */
- E_LPC_a_weight(p_A, Ap, GAMMA1, M);
- memset(h1, 0, L_SUBFR * sizeof(Float32));
- memcpy(h1, Ap, (M + 1) * sizeof(Float32));
- E_UTIL_synthesis(p_Aq, h1, h1, L_SUBFR, h1 + (M + 1), 0);
- f_tmp = 0.0;
- E_UTIL_deemph(h1, TILT_FAC, L_SUBFR, &f_tmp);
- /*
- * Closed-loop fractional pitch search
- */
- /* find closed loop fractional pitch lag */
- if (*mode <= MODE_9k)
- {
- T0 = E_GAIN_closed_loop_search(&f_exc[i_subfr], xn, h1,
- T0_min, T0_max, &T0_frac,
- pit_flag, PIT_MIN, PIT_FR1_8b);
- /* encode pitch lag */
- if (pit_flag == 0) /* if 1st/3rd subframe */
- {
- /*
- * The pitch range for the 1st/3rd subframe is encoded with
- * 8 bits and is divided as follows:
- * PIT_MIN to PIT_FR1-1 resolution 1/2 (frac = 0 or 2)
- * PIT_FR1 to PIT_MAX resolution 1 (frac = 0)
- */
- if (T0 < PIT_FR1_8b)
- {
- index = (Word16)(T0 * 2 + (T0_frac >> 1) - (PIT_MIN * 2));
- }
- else
- {
- index = (Word16)(T0 - PIT_FR1_8b + ((PIT_FR1_8b - PIT_MIN) * 2));
- }
- E_MAIN_parm_store(index, &prms);
- /* find T0_min and T0_max for subframe 2 and 4 */
- T0_min = T0 - 8;
- if (T0_min < PIT_MIN)
- {
- T0_min = PIT_MIN;
- }
- T0_max = T0_min + 15;
- if (T0_max > PIT_MAX)
- {
- T0_max = PIT_MAX;
- T0_min = T0_max - 15;
- }
- }
- else /* if subframe 2 or 4 */
- {
- /*
- * The pitch range for subframe 2 or 4 is encoded with 6 bits:
- * T0_min to T0_max resolution 1/2 (frac = 0 or 2)
- */
- i = T0 - T0_min;
- index = (Word16)(i * 2 + (T0_frac >> 1));
- E_MAIN_parm_store(index, &prms);
- }
- }
- else
- {
- T0 = E_GAIN_closed_loop_search(&f_exc[i_subfr], xn, h1,
- T0_min, T0_max, &T0_frac,
- pit_flag, PIT_FR2, PIT_FR1_9b);
- /* encode pitch lag */
- if (pit_flag == 0) /* if 1st/3rd subframe */
- {
- /*
- * The pitch range for the 1st/3rd subframe is encoded with
- * 9 bits and is divided as follows:
- * PIT_MIN to PIT_FR2-1 resolution 1/4 (frac = 0,1,2 or 3)
- * PIT_FR2 to PIT_FR1-1 resolution 1/2 (frac = 0 or 2)
- * PIT_FR1 to PIT_MAX resolution 1 (frac = 0)
- */
- if (T0 < PIT_FR2)
- {
- index = (Word16)(T0 * 4 + T0_frac - (PIT_MIN * 4));
- }
- else if (T0 < PIT_FR1_9b)
- {
- index = (Word16)(T0 * 2 + (T0_frac >> 1) - (PIT_FR2 * 2) + ((PIT_FR2 - PIT_MIN) * 4));
- }
- else
- {
- index = (Word16)(T0 - PIT_FR1_9b + ((PIT_FR2 - PIT_MIN) * 4) + ((PIT_FR1_9b - PIT_FR2) * 2));
- }
- E_MAIN_parm_store(index, &prms);
- /* find T0_min and T0_max for subframe 2 and 4 */
- T0_min = T0 - 8;
- if (T0_min < PIT_MIN)
- {
- T0_min = PIT_MIN;
- }
- T0_max = T0_min + 15;
- if (T0_max > PIT_MAX)
- {
- T0_max = PIT_MAX;
- T0_min = T0_max - 15;
- }
- }
- else /* if subframe 2 or 4 */
- {
- /*
- * The pitch range for subframe 2 or 4 is encoded with 6 bits:
- * T0_min to T0_max resolution 1/4 (frac = 0,1,2 or 3)
- */
- i = T0 - T0_min;
- index = (Word16)(i * 4 + T0_frac);
- E_MAIN_parm_store(index, &prms);
- }
- }
- /*
- * Gain clipping test to avoid unstable synthesis on frame erasure
- */
- clip_gain = E_GAIN_clip_test(st->mem_gp_clip);
- /*
- * - find unity gain pitch excitation (adaptive codebook entry)
- * with fractional interpolation.
- * - find filtered pitch exc. y1[]=exc[] convolved with h1[])
- * - compute pitch gain1
- */
- /* find pitch exitation */
- E_GAIN_adaptive_codebook_excitation(&exc[i_subfr], (Word16)T0, T0_frac, L_SUBFR + 1);
- if(*mode > MODE_9k)
- {
- E_UTIL_convolve(&exc[i_subfr], st->mem_q, h1, y1);
- gain1 = E_ACELP_xy1_corr(xn, y1, g_coeff);
- /* clip gain if necessary to avoid problem at decoder */
- if (clip_gain && (gain1 > 0.95))
- {
- gain1 = 0.95f;
- }
- /* find energy of new target xn2[] */
- E_ACELP_codebook_target_update(xn, dn, y1, gain1);
- }
- else
- {
- gain1 = 0.0F;
- }
- /*
- * - find pitch excitation filtered by 1st order LP filter.
- * - find filtered pitch exc. y2[]=exc[] convolved with h1[])
- * - compute pitch gain2
- */
- /* find pitch excitation with lp filter */
- for (i = 0; i < L_SUBFR; i++)
- {
- l_tmp = 5898 * exc[i - 1 + i_subfr];
- l_tmp += 20972 * exc[i + i_subfr];
- l_tmp += 5898 * exc[i + 1 + i_subfr];
- s_code[i] = (Word16)((l_tmp + 0x4000) >> 15);
- }
- E_UTIL_convolve(s_code, st->mem_q, h1, y2);
- gain2 = E_ACELP_xy1_corr(xn, y2, g_coeff2);
- /* clip gain if necessary to avoid problem at decoder */
- if (clip_gain && (gain2 > 0.95))
- {
- gain2 = 0.95F;
- }
- /* find energy of new target xn2[] */
- E_ACELP_codebook_target_update(xn, xn2, y2, gain2);
- /*
- * use the best prediction (minimise quadratic error).
- */
- select = 0;
- if (*mode > MODE_9k)
- {
- f_tmp = 0.0;
- for (i = 0; i < L_SUBFR; i++)
- {
- f_tmp += dn[i] * dn[i];
- f_tmp -= xn2[i] * xn2[i];
- }
- if (f_tmp < 0.1)
- {
- select = 1;
- }
- E_MAIN_parm_store(select, &prms);
- }
- if (select == 0)
- {
- /* use the lp filter for pitch excitation prediction */
- memcpy(&exc[i_subfr], s_code, L_SUBFR * sizeof(Word16));
- memcpy(y1, y2, L_SUBFR * sizeof(Float32));
- gain_pit = gain2;
- g_coeff[0] = g_coeff2[0];
- g_coeff[1] = g_coeff2[1];
- }
- else
- {
- /* no filter used for pitch excitation prediction */
- gain_pit = gain1;
- memcpy(xn2, dn, L_SUBFR * sizeof(Float32)); /* target vector for codebook search */
- }
- /*
- * - update target vector for codebook search
- * - scaling of cn[] to limit dynamic at 12 bits
- */
- for (i = 0; i < L_SUBFR; i ++)
- {
- cn[i] = (Float32)(cn[i] - gain_pit * exc[i_subfr + i] * pow(2, Q_new));
- }
- /*
- * - include fixed-gain pitch contribution into impulse resp. h1[]
- */
- f_tmp = 0.0F;
- E_UTIL_f_preemph(h1, (Float32)(st->mem_tilt_code / 32768.0), L_SUBFR, &f_tmp);
- if (T0_frac > 2)
- {
- T0++;
- }
- E_GAIN_f_pitch_sharpening(h1, T0);
- /*
- * - Correlation between target xn2[] and impulse response h1[]
- * - Innovative codebook search
- */
- E_ACELP_xh_corr(xn2, dn, h1);
- switch(*mode)
- {
- case MODE_7k:
- E_ACELP_2t(dn, cn, h1, s_code, y2, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- break;
- case MODE_9k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 20, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- break;
- case MODE_12k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 36, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- break;
- case MODE_14k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 44, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- break;
- case MODE_16k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 52, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- break;
- case MODE_18k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 64, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- E_MAIN_parm_store((Word16)indice[4], &prms);
- E_MAIN_parm_store((Word16)indice[5], &prms);
- E_MAIN_parm_store((Word16)indice[6], &prms);
- E_MAIN_parm_store((Word16)indice[7], &prms);
- break;
- case MODE_20k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 72, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- E_MAIN_parm_store((Word16)indice[4], &prms);
- E_MAIN_parm_store((Word16)indice[5], &prms);
- E_MAIN_parm_store((Word16)indice[6], &prms);
- E_MAIN_parm_store((Word16)indice[7], &prms);
- break;
- case MODE_23k:
- case MODE_24k:
- E_ACELP_4t(dn, cn, h1, s_code, y2, 88, *mode, indice);
- E_MAIN_parm_store((Word16)indice[0], &prms);
- E_MAIN_parm_store((Word16)indice[1], &prms);
- E_MAIN_parm_store((Word16)indice[2], &prms);
- E_MAIN_parm_store((Word16)indice[3], &prms);
- E_MAIN_parm_store((Word16)indice[4], &prms);
- E_MAIN_parm_store((Word16)indice[5], &prms);
- E_MAIN_parm_store((Word16)indice[6], &prms);
- E_MAIN_parm_store((Word16)indice[7], &prms);
- break;
- default:
- return -1;
- }
- /*
- * - Add the fixed-gain pitch contribution to code[].
- */
- s_tmp = 0;
- E_UTIL_preemph(s_code, st->mem_tilt_code, L_SUBFR, &s_tmp);
- E_GAIN_pitch_sharpening(s_code, (Word16)T0);
- E_ACELP_xy2_corr(xn, y1, y2, g_coeff);
- /*
- * - Compute the fixed codebook gain
- * - quantize fixed codebook gain
- */
- if (*mode <= MODE_9k)
- {
- index = (Word16)E_ACELP_gains_quantise(s_code, 6, gain_pit,
- &s_gain_pit, &L_gain_code, g_coeff, clip_gain, st->mem_gain_q);
- E_MAIN_parm_store(index, &prms);
- }
- else
- {
- index = (Word16)E_ACELP_gains_quantise(s_code, 7, gain_pit,
- &s_gain_pit, &L_gain_code, g_coeff, clip_gain, st->mem_gain_q);
- E_MAIN_parm_store(index, &prms);
- }
- /* find best scaling to perform on excitation (Q_new) */
- s_tmp = st->mem_subfr_q[0];
- for (i = 1; i < 4; i++)
- {
- if (st->mem_subfr_q[i] < s_tmp)
- {
- s_tmp = st->mem_subfr_q[i];
- }
- }
- /* limit scaling (Q_new) to Q_MAX */
- if (s_tmp > Q_MAX)
- {
- s_tmp = Q_MAX;
- }
- Q_new = 0;
- l_tmp = L_gain_code; /* L_gain_code in Q16 */
- while ((l_tmp < 0x08000000L) && (Q_new < s_tmp))
- {
- l_tmp = (l_tmp << 1);
- Q_new = Q_new + 1;
- }
- if (l_tmp < 0x7FFF7FFF)
- {
- /* scaled gain_code with Qnew */
- gain_code = (Word16)((l_tmp + 0x8000) >> 16);
- }
- else
- {
- gain_code = 32767;
- }
- if (Q_new > st->mem_q)
- {
- E_UTIL_signal_up_scale(exc + i_subfr - (PIT_MAX + L_INTERPOL),
- (Word16)(Q_new - st->mem_q));
- }
- else
- {
- E_UTIL_signal_down_scale(exc + i_subfr - (PIT_MAX + L_INTERPOL),
- PIT_MAX + L_INTERPOL + L_SUBFR, (Word16)(st->mem_q - Q_new));
- }
- st->mem_q = (Word16)Q_new;
- /* test quantized gain of pitch for pitch clipping algorithm */
- E_GAIN_clip_pit_test((Float32)(s_gain_pit * pow(2, -14)),
- st->mem_gp_clip);
- /*
- * Update parameters for the next subframe.
- * - tilt of code: 0.0 (unvoiced) to 0.5 (voiced)
- */
- /* find voice factor in Q15 (1=voiced, -1=unvoiced) */
- memcpy(exc2, &exc[i_subfr], L_SUBFR * sizeof(Word16));
- E_UTIL_signal_down_scale(exc2, L_SUBFR, 3);
- voice_fac = E_GAIN_voice_factor(exc2, -3, s_gain_pit, s_code, gain_code);
- /* tilt of code for next subframe: 0.5=voiced, 0=unvoiced */
- st->mem_tilt_code = (Word16)((voice_fac >> 2) + 8192);
- /*
- * - Update filter's memory "mem_w0" for finding the
- * target vector in the next subframe.
- * - Find the total excitation
- * - Find synthesis speech to update mem_syn[].
- */
- memcpy(exc2, &exc[i_subfr], L_SUBFR * sizeof(Word16));
- st->mem_w0 = (Float32)((xn[L_SUBFR - 1] -
- ((s_gain_pit / 16384.0F) * y1[L_SUBFR - 1])) -
- (gain_code * pow(2, -st->mem_q) * y2[L_SUBFR - 1]));
- if (*mode == MODE_24k)
- {
- Q_new = -st->mem_q;
- for (i = 0; i < L_SUBFR; i++)
- {
- f_exc2[i_subfr + i] = (Float32)(exc[i_subfr + i] * pow(2, Q_new) * (s_gain_pit / 16384.0F));
- }
- }
- s_max = 1;
- for (i = 0; i < L_SUBFR; i++)
- {
- /* code in Q9, gain_pit in Q14 */
- l_tmp = gain_code * s_code[i];
- l_tmp = l_tmp << 5;
- l_tmp += exc[i + i_subfr] * s_gain_pit; /* gain_pit Q14 */
- l_tmp = (l_tmp + 0x2000) >> 14;
- if ((l_tmp > MIN_16) & (l_tmp < 32768))
- {
- exc[i + i_subfr] = (Word16)l_tmp;
- s_tmp = (Word16)abs(l_tmp);
- if (s_tmp > s_max)
- {
- s_max = s_tmp;
- }
- }
- else if (l_tmp > MAX_16)
- {
- exc[i + i_subfr] = MAX_16;
- s_max = MAX_16;
- }
- else
- {
- exc[i + i_subfr] = MIN_16;
- s_max = MAX_16;
- }
- }
- /* tmp = scaling possible according to max value of excitation */
- s_tmp = (Word16)((E_UTIL_norm_s(s_max) + st->mem_q) - 1);
- st->mem_subfr_q[3] = st->mem_subfr_q[2];
- st->mem_subfr_q[2] = st->mem_subfr_q[1];
- st->mem_subfr_q[1] = st->mem_subfr_q[0];
- st->mem_subfr_q[0] = s_tmp;
- Q_new = -st->mem_q;
- for (i = 0; i < L_SUBFR; i++)
- {
- f_exc[i + i_subfr] = (Float32)(exc[i + i_subfr] * pow(2, Q_new));
- }
- E_UTIL_synthesis(p_Aq, &f_exc[i_subfr], synth, L_SUBFR, st->mem_syn, 1);
- if(*mode >= MODE_24k)
- {
- /*
- * noise enhancer
- * --------------
- * - Enhance excitation on noise. (modify gain of code)
- * If signal is noisy and LPC filter is stable, move gain
- * of code 1.5 dB toward gain of code threshold.
- * This decrease by 3 dB noise energy variation.
- */
- /* 1=unvoiced, 0=voiced */
- f_tmp = (Float32)(0.5 * (1.0 - (voice_fac / 32768.0)));
- fac = stab_fac * f_tmp;
- f_tmp = (Float32)(gain_code * pow(2, -st->mem_q));
- if(f_tmp < st->mem_gc_threshold)
- {
- f_tmp = (Float32)(f_tmp * 1.19);
- if(f_tmp > st->mem_gc_threshold)
- {
- f_tmp = st->mem_gc_threshold;
- }
- }
- else
- {
- f_tmp = (Float32)(f_tmp / 1.19);
- if(f_tmp < st->mem_gc_threshold)
- {
- f_tmp = st->mem_gc_threshold;
- }
- }
- st->mem_gc_threshold = f_tmp;
- f_tmp = (Float32)(((fac * f_tmp) + ((1.0 - fac) *
- (gain_code * pow(2, -st->mem_q)))) * 0.001953125F);
- for(i = 0; i < L_SUBFR; i++)
- {
- f_code[i] = (Float32)(s_code[i] * f_tmp);
- }
- /*
- * pitch enhancer
- * --------------
- * - Enhance excitation on voice. (HP filtering of code)
- * On voiced signal, filtering of code by a smooth fir HP
- * filter to decrease energy of code in low frequency.
- */
- /* 0.25=voiced, 0=unvoiced */
- f_tmp = (Float32)(0.125F * (1.0F + (voice_fac / 32768.0)));
- f_exc2[i_subfr] += f_code[0] - (f_tmp * f_code[1]);
- for(i = 1; i < L_SUBFR - 1; i++)
- {
- f_exc2[i + i_subfr] +=
- f_code[i] - (f_tmp * f_code[i - 1]) - (f_tmp * f_code[i + 1]);
- }
- f_exc2[i_subfr + L_SUBFR - 1] +=
- f_code[L_SUBFR - 1] - (f_tmp * f_code[L_SUBFR - 2]);
- corr_gain = (Word16)E_UTIL_enc_synthesis(p_Aq, &f_exc2[i_subfr],
- &f_speech16k[i_subfr * 5 /4], st);
- E_MAIN_parm_store(corr_gain, &prms);
- }
- p_A += (M + 1);
- p_Aq += (M + 1);
- } /* end of subframe loop */
- /*
- * Update signal for next frame.
- * -> save past of speech[], wsp[] and exc[].
- */
- memmove(st->mem_speech, &st->mem_speech[L_FRAME], (L_TOTAL - L_FRAME) * sizeof(Float32));
- memmove(st->mem_wsp, &st->mem_wsp[L_FRAME / OPL_DECIM], (PIT_MAX / OPL_DECIM) * sizeof(Float32));
- memmove(st->mem_exc, &st->mem_exc[L_FRAME], (PIT_MAX + L_INTERPOL) * sizeof(Word16));
- return 0;
- }