/* | |
** Copyright 2003-2010, VisualOn, Inc. | |
** | |
** Licensed under the Apache License, Version 2.0 (the "License"); | |
** you may not use this file except in compliance with the License. | |
** You may obtain a copy of the License at | |
** | |
** http://www.apache.org/licenses/LICENSE-2.0 | |
** | |
** Unless required by applicable law or agreed to in writing, software | |
** distributed under the License is distributed on an "AS IS" BASIS, | |
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
** See the License for the specific language governing permissions and | |
** limitations under the License. | |
*/ | |
/*********************************************************************** | |
* File: dtx.c * | |
* * | |
* Description:DTX functions * | |
* * | |
************************************************************************/ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include "typedef.h" | |
#include "basic_op.h" | |
#include "oper_32b.h" | |
#include "math_op.h" | |
#include "cnst.h" | |
#include "acelp.h" /* prototype of functions */ | |
#include "bits.h" | |
#include "dtx.h" | |
#include "log2.h" | |
#include "mem_align.h" | |
static void aver_isf_history( | |
Word16 isf_old[], | |
Word16 indices[], | |
Word32 isf_aver[] | |
); | |
static void find_frame_indices( | |
Word16 isf_old_tx[], | |
Word16 indices[], | |
dtx_encState * st | |
); | |
static Word16 dithering_control( | |
dtx_encState * st | |
); | |
/* excitation energy adjustment depending on speech coder mode used, Q7 */ | |
static Word16 en_adjust[9] = | |
{ | |
230, /* mode0 = 7k : -5.4dB */ | |
179, /* mode1 = 9k : -4.2dB */ | |
141, /* mode2 = 12k : -3.3dB */ | |
128, /* mode3 = 14k : -3.0dB */ | |
122, /* mode4 = 16k : -2.85dB */ | |
115, /* mode5 = 18k : -2.7dB */ | |
115, /* mode6 = 20k : -2.7dB */ | |
115, /* mode7 = 23k : -2.7dB */ | |
115 /* mode8 = 24k : -2.7dB */ | |
}; | |
/************************************************************************** | |
* | |
* Function : dtx_enc_init | |
* | |
**************************************************************************/ | |
Word16 dtx_enc_init(dtx_encState ** st, Word16 isf_init[], VO_MEM_OPERATOR *pMemOP) | |
{ | |
dtx_encState *s; | |
if (st == (dtx_encState **) NULL) | |
{ | |
fprintf(stderr, "dtx_enc_init: invalid parameter\n"); | |
return -1; | |
} | |
*st = NULL; | |
/* allocate memory */ | |
if ((s = (dtx_encState *)mem_malloc(pMemOP, sizeof(dtx_encState), 32, VO_INDEX_ENC_AMRWB)) == NULL) | |
{ | |
fprintf(stderr, "dtx_enc_init: can not malloc state structure\n"); | |
return -1; | |
} | |
dtx_enc_reset(s, isf_init); | |
*st = s; | |
return 0; | |
} | |
/************************************************************************** | |
* | |
* Function : dtx_enc_reset | |
* | |
**************************************************************************/ | |
Word16 dtx_enc_reset(dtx_encState * st, Word16 isf_init[]) | |
{ | |
Word32 i; | |
if (st == (dtx_encState *) NULL) | |
{ | |
fprintf(stderr, "dtx_enc_reset: invalid parameter\n"); | |
return -1; | |
} | |
st->hist_ptr = 0; | |
st->log_en_index = 0; | |
/* Init isf_hist[] */ | |
for (i = 0; i < DTX_HIST_SIZE; i++) | |
{ | |
Copy(isf_init, &st->isf_hist[i * M], M); | |
} | |
st->cng_seed = RANDOM_INITSEED; | |
/* Reset energy history */ | |
Set_zero(st->log_en_hist, DTX_HIST_SIZE); | |
st->dtxHangoverCount = DTX_HANG_CONST; | |
st->decAnaElapsedCount = 32767; | |
for (i = 0; i < 28; i++) | |
{ | |
st->D[i] = 0; | |
} | |
for (i = 0; i < DTX_HIST_SIZE - 1; i++) | |
{ | |
st->sumD[i] = 0; | |
} | |
return 1; | |
} | |
/************************************************************************** | |
* | |
* Function : dtx_enc_exit | |
* | |
**************************************************************************/ | |
void dtx_enc_exit(dtx_encState ** st, VO_MEM_OPERATOR *pMemOP) | |
{ | |
if (st == NULL || *st == NULL) | |
return; | |
/* deallocate memory */ | |
mem_free(pMemOP, *st, VO_INDEX_ENC_AMRWB); | |
*st = NULL; | |
return; | |
} | |
/************************************************************************** | |
* | |
* Function : dtx_enc | |
* | |
**************************************************************************/ | |
Word16 dtx_enc( | |
dtx_encState * st, /* i/o : State struct */ | |
Word16 isf[M], /* o : CN ISF vector */ | |
Word16 * exc2, /* o : CN excitation */ | |
Word16 ** prms | |
) | |
{ | |
Word32 i, j; | |
Word16 indice[7]; | |
Word16 log_en, gain, level, exp, exp0, tmp; | |
Word16 log_en_int_e, log_en_int_m; | |
Word32 L_isf[M], ener32, level32; | |
Word16 isf_order[3]; | |
Word16 CN_dith; | |
/* VOX mode computation of SID parameters */ | |
log_en = 0; | |
for (i = 0; i < M; i++) | |
{ | |
L_isf[i] = 0; | |
} | |
/* average energy and isf */ | |
for (i = 0; i < DTX_HIST_SIZE; i++) | |
{ | |
/* Division by DTX_HIST_SIZE = 8 has been done in dtx_buffer. log_en is in Q10 */ | |
log_en = add(log_en, st->log_en_hist[i]); | |
} | |
find_frame_indices(st->isf_hist, isf_order, st); | |
aver_isf_history(st->isf_hist, isf_order, L_isf); | |
for (j = 0; j < M; j++) | |
{ | |
isf[j] = (Word16)(L_isf[j] >> 3); /* divide by 8 */ | |
} | |
/* quantize logarithmic energy to 6 bits (-6 : 66 dB) which corresponds to -2:22 in log2(E). */ | |
/* st->log_en_index = (short)( (log_en + 2.0) * 2.625 ); */ | |
/* increase dynamics to 7 bits (Q8) */ | |
log_en = (log_en >> 2); | |
/* Add 2 in Q8 = 512 to get log2(E) between 0:24 */ | |
log_en = add(log_en, 512); | |
/* Multiply by 2.625 to get full 6 bit range. 2.625 = 21504 in Q13. The result is in Q6 */ | |
log_en = mult(log_en, 21504); | |
/* Quantize Energy */ | |
st->log_en_index = shr(log_en, 6); | |
if(st->log_en_index > 63) | |
{ | |
st->log_en_index = 63; | |
} | |
if (st->log_en_index < 0) | |
{ | |
st->log_en_index = 0; | |
} | |
/* Quantize ISFs */ | |
Qisf_ns(isf, isf, indice); | |
Parm_serial(indice[0], 6, prms); | |
Parm_serial(indice[1], 6, prms); | |
Parm_serial(indice[2], 6, prms); | |
Parm_serial(indice[3], 5, prms); | |
Parm_serial(indice[4], 5, prms); | |
Parm_serial((st->log_en_index), 6, prms); | |
CN_dith = dithering_control(st); | |
Parm_serial(CN_dith, 1, prms); | |
/* level = (float)( pow( 2.0f, (float)st->log_en_index / 2.625 - 2.0 ) ); */ | |
/* log2(E) in Q9 (log2(E) lies in between -2:22) */ | |
log_en = shl(st->log_en_index, 15 - 6); | |
/* Divide by 2.625; log_en will be between 0:24 */ | |
log_en = mult(log_en, 12483); | |
/* the result corresponds to log2(gain) in Q10 */ | |
/* Find integer part */ | |
log_en_int_e = (log_en >> 10); | |
/* Find fractional part */ | |
log_en_int_m = (Word16) (log_en & 0x3ff); | |
log_en_int_m = shl(log_en_int_m, 5); | |
/* Subtract 2 from log_en in Q9, i.e divide the gain by 2 (energy by 4) */ | |
/* Add 16 in order to have the result of pow2 in Q16 */ | |
log_en_int_e = add(log_en_int_e, 16 - 1); | |
level32 = Pow2(log_en_int_e, log_en_int_m); /* Q16 */ | |
exp0 = norm_l(level32); | |
level32 = (level32 << exp0); /* level in Q31 */ | |
exp0 = (15 - exp0); | |
level = extract_h(level32); /* level in Q15 */ | |
/* generate white noise vector */ | |
for (i = 0; i < L_FRAME; i++) | |
{ | |
exc2[i] = (Random(&(st->cng_seed)) >> 4); | |
} | |
/* gain = level / sqrt(ener) * sqrt(L_FRAME) */ | |
/* energy of generated excitation */ | |
ener32 = Dot_product12(exc2, exc2, L_FRAME, &exp); | |
Isqrt_n(&ener32, &exp); | |
gain = extract_h(ener32); | |
gain = mult(level, gain); /* gain in Q15 */ | |
exp = add(exp0, exp); | |
/* Multiply by sqrt(L_FRAME)=16, i.e. shift left by 4 */ | |
exp += 4; | |
for (i = 0; i < L_FRAME; i++) | |
{ | |
tmp = mult(exc2[i], gain); /* Q0 * Q15 */ | |
exc2[i] = shl(tmp, exp); | |
} | |
return 0; | |
} | |
/************************************************************************** | |
* | |
* Function : dtx_buffer Purpose : handles the DTX buffer | |
* | |
**************************************************************************/ | |
Word16 dtx_buffer( | |
dtx_encState * st, /* i/o : State struct */ | |
Word16 isf_new[], /* i : isf vector */ | |
Word32 enr, /* i : residual energy (in L_FRAME) */ | |
Word16 codec_mode | |
) | |
{ | |
Word16 log_en; | |
Word16 log_en_e; | |
Word16 log_en_m; | |
st->hist_ptr = add(st->hist_ptr, 1); | |
if(st->hist_ptr == DTX_HIST_SIZE) | |
{ | |
st->hist_ptr = 0; | |
} | |
/* copy lsp vector into buffer */ | |
Copy(isf_new, &st->isf_hist[st->hist_ptr * M], M); | |
/* log_en = (float)log10(enr*0.0059322)/(float)log10(2.0f); */ | |
Log2(enr, &log_en_e, &log_en_m); | |
/* convert exponent and mantissa to Word16 Q7. Q7 is used to simplify averaging in dtx_enc */ | |
log_en = shl(log_en_e, 7); /* Q7 */ | |
log_en = add(log_en, shr(log_en_m, 15 - 7)); | |
/* Find energy per sample by multiplying with 0.0059322, i.e subtract log2(1/0.0059322) = 7.39722 The | |
* constant 0.0059322 takes into account windowings and analysis length from autocorrelation | |
* computations; 7.39722 in Q7 = 947 */ | |
/* Subtract 3 dB = 0.99658 in log2(E) = 127 in Q7. */ | |
/* log_en = sub( log_en, 947 + en_adjust[codec_mode] ); */ | |
/* Find energy per sample (divide by L_FRAME=256), i.e subtract log2(256) = 8.0 (1024 in Q7) */ | |
/* Subtract 3 dB = 0.99658 in log2(E) = 127 in Q7. */ | |
log_en = sub(log_en, add(1024, en_adjust[codec_mode])); | |
/* Insert into the buffer */ | |
st->log_en_hist[st->hist_ptr] = log_en; | |
return 0; | |
} | |
/************************************************************************** | |
* | |
* Function : tx_dtx_handler Purpose : adds extra speech hangover | |
* to analyze speech on | |
* the decoding side. | |
**************************************************************************/ | |
void tx_dtx_handler(dtx_encState * st, /* i/o : State struct */ | |
Word16 vad_flag, /* i : vad decision */ | |
Word16 * usedMode /* i/o : mode changed or not */ | |
) | |
{ | |
/* this state machine is in synch with the GSMEFR txDtx machine */ | |
st->decAnaElapsedCount = add(st->decAnaElapsedCount, 1); | |
if (vad_flag != 0) | |
{ | |
st->dtxHangoverCount = DTX_HANG_CONST; | |
} else | |
{ /* non-speech */ | |
if (st->dtxHangoverCount == 0) | |
{ /* out of decoder analysis hangover */ | |
st->decAnaElapsedCount = 0; | |
*usedMode = MRDTX; | |
} else | |
{ /* in possible analysis hangover */ | |
st->dtxHangoverCount = sub(st->dtxHangoverCount, 1); | |
/* decAnaElapsedCount + dtxHangoverCount < DTX_ELAPSED_FRAMES_THRESH */ | |
if (sub(add(st->decAnaElapsedCount, st->dtxHangoverCount), | |
DTX_ELAPSED_FRAMES_THRESH) < 0) | |
{ | |
*usedMode = MRDTX; | |
/* if short time since decoder update, do not add extra HO */ | |
} | |
/* else override VAD and stay in speech mode *usedMode and add extra hangover */ | |
} | |
} | |
return; | |
} | |
static void aver_isf_history( | |
Word16 isf_old[], | |
Word16 indices[], | |
Word32 isf_aver[] | |
) | |
{ | |
Word32 i, j, k; | |
Word16 isf_tmp[2 * M]; | |
Word32 L_tmp; | |
/* Memorize in isf_tmp[][] the ISF vectors to be replaced by */ | |
/* the median ISF vector prior to the averaging */ | |
for (k = 0; k < 2; k++) | |
{ | |
if ((indices[k] + 1) != 0) | |
{ | |
for (i = 0; i < M; i++) | |
{ | |
isf_tmp[k * M + i] = isf_old[indices[k] * M + i]; | |
isf_old[indices[k] * M + i] = isf_old[indices[2] * M + i]; | |
} | |
} | |
} | |
/* Perform the ISF averaging */ | |
for (j = 0; j < M; j++) | |
{ | |
L_tmp = 0; | |
for (i = 0; i < DTX_HIST_SIZE; i++) | |
{ | |
L_tmp = L_add(L_tmp, L_deposit_l(isf_old[i * M + j])); | |
} | |
isf_aver[j] = L_tmp; | |
} | |
/* Retrieve from isf_tmp[][] the ISF vectors saved prior to averaging */ | |
for (k = 0; k < 2; k++) | |
{ | |
if ((indices[k] + 1) != 0) | |
{ | |
for (i = 0; i < M; i++) | |
{ | |
isf_old[indices[k] * M + i] = isf_tmp[k * M + i]; | |
} | |
} | |
} | |
return; | |
} | |
static void find_frame_indices( | |
Word16 isf_old_tx[], | |
Word16 indices[], | |
dtx_encState * st | |
) | |
{ | |
Word32 L_tmp, summin, summax, summax2nd; | |
Word16 i, j, tmp; | |
Word16 ptr; | |
/* Remove the effect of the oldest frame from the column */ | |
/* sum sumD[0..DTX_HIST_SIZE-1]. sumD[DTX_HIST_SIZE] is */ | |
/* not updated since it will be removed later. */ | |
tmp = DTX_HIST_SIZE_MIN_ONE; | |
j = -1; | |
for (i = 0; i < DTX_HIST_SIZE_MIN_ONE; i++) | |
{ | |
j = add(j, tmp); | |
st->sumD[i] = L_sub(st->sumD[i], st->D[j]); | |
tmp = sub(tmp, 1); | |
} | |
/* Shift the column sum sumD. The element sumD[DTX_HIST_SIZE-1] */ | |
/* corresponding to the oldest frame is removed. The sum of */ | |
/* the distances between the latest isf and other isfs, */ | |
/* i.e. the element sumD[0], will be computed during this call. */ | |
/* Hence this element is initialized to zero. */ | |
for (i = DTX_HIST_SIZE_MIN_ONE; i > 0; i--) | |
{ | |
st->sumD[i] = st->sumD[i - 1]; | |
} | |
st->sumD[0] = 0; | |
/* Remove the oldest frame from the distance matrix. */ | |
/* Note that the distance matrix is replaced by a one- */ | |
/* dimensional array to save static memory. */ | |
tmp = 0; | |
for (i = 27; i >= 12; i = (Word16) (i - tmp)) | |
{ | |
tmp = add(tmp, 1); | |
for (j = tmp; j > 0; j--) | |
{ | |
st->D[i - j + 1] = st->D[i - j - tmp]; | |
} | |
} | |
/* Compute the first column of the distance matrix D */ | |
/* (squared Euclidean distances from isf1[] to isf_old_tx[][]). */ | |
ptr = st->hist_ptr; | |
for (i = 1; i < DTX_HIST_SIZE; i++) | |
{ | |
/* Compute the distance between the latest isf and the other isfs. */ | |
ptr = sub(ptr, 1); | |
if (ptr < 0) | |
{ | |
ptr = DTX_HIST_SIZE_MIN_ONE; | |
} | |
L_tmp = 0; | |
for (j = 0; j < M; j++) | |
{ | |
tmp = sub(isf_old_tx[st->hist_ptr * M + j], isf_old_tx[ptr * M + j]); | |
L_tmp = L_mac(L_tmp, tmp, tmp); | |
} | |
st->D[i - 1] = L_tmp; | |
/* Update also the column sums. */ | |
st->sumD[0] = L_add(st->sumD[0], st->D[i - 1]); | |
st->sumD[i] = L_add(st->sumD[i], st->D[i - 1]); | |
} | |
/* Find the minimum and maximum distances */ | |
summax = st->sumD[0]; | |
summin = st->sumD[0]; | |
indices[0] = 0; | |
indices[2] = 0; | |
for (i = 1; i < DTX_HIST_SIZE; i++) | |
{ | |
if (L_sub(st->sumD[i], summax) > 0) | |
{ | |
indices[0] = i; | |
summax = st->sumD[i]; | |
} | |
if (L_sub(st->sumD[i], summin) < 0) | |
{ | |
indices[2] = i; | |
summin = st->sumD[i]; | |
} | |
} | |
/* Find the second largest distance */ | |
summax2nd = -2147483647L; | |
indices[1] = -1; | |
for (i = 0; i < DTX_HIST_SIZE; i++) | |
{ | |
if ((L_sub(st->sumD[i], summax2nd) > 0) && (sub(i, indices[0]) != 0)) | |
{ | |
indices[1] = i; | |
summax2nd = st->sumD[i]; | |
} | |
} | |
for (i = 0; i < 3; i++) | |
{ | |
indices[i] = sub(st->hist_ptr, indices[i]); | |
if (indices[i] < 0) | |
{ | |
indices[i] = add(indices[i], DTX_HIST_SIZE); | |
} | |
} | |
/* If maximum distance/MED_THRESH is smaller than minimum distance */ | |
/* then the median ISF vector replacement is not performed */ | |
tmp = norm_l(summax); | |
summax = (summax << tmp); | |
summin = (summin << tmp); | |
L_tmp = L_mult(voround(summax), INV_MED_THRESH); | |
if(L_tmp <= summin) | |
{ | |
indices[0] = -1; | |
} | |
/* If second largest distance/MED_THRESH is smaller than */ | |
/* minimum distance then the median ISF vector replacement is */ | |
/* not performed */ | |
summax2nd = L_shl(summax2nd, tmp); | |
L_tmp = L_mult(voround(summax2nd), INV_MED_THRESH); | |
if(L_tmp <= summin) | |
{ | |
indices[1] = -1; | |
} | |
return; | |
} | |
static Word16 dithering_control( | |
dtx_encState * st | |
) | |
{ | |
Word16 tmp, mean, CN_dith, gain_diff; | |
Word32 i, ISF_diff; | |
/* determine how stationary the spectrum of background noise is */ | |
ISF_diff = 0; | |
for (i = 0; i < 8; i++) | |
{ | |
ISF_diff = L_add(ISF_diff, st->sumD[i]); | |
} | |
if ((ISF_diff >> 26) > 0) | |
{ | |
CN_dith = 1; | |
} else | |
{ | |
CN_dith = 0; | |
} | |
/* determine how stationary the energy of background noise is */ | |
mean = 0; | |
for (i = 0; i < DTX_HIST_SIZE; i++) | |
{ | |
mean = add(mean, st->log_en_hist[i]); | |
} | |
mean = (mean >> 3); | |
gain_diff = 0; | |
for (i = 0; i < DTX_HIST_SIZE; i++) | |
{ | |
tmp = abs_s(sub(st->log_en_hist[i], mean)); | |
gain_diff = add(gain_diff, tmp); | |
} | |
if (gain_diff > GAIN_THR) | |
{ | |
CN_dith = 1; | |
} | |
return CN_dith; | |
} |