ref: 012ae34cae3f152370a7c58602d8cbb841cd8aad
dir: /amr-wb/dtx.c/
/*-------------------------------------------------------------------*
* DTX.C *
*-------------------------------------------------------------------*
* 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 "count.h"
#include "log2.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
);
static void CN_dithering(
Word16 isf[M],
Word32 * L_log_en_int,
Word16 * dither_seed
);
/* 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[])
{
dtx_encState *s;
test();
if (st == (dtx_encState **) NULL)
{
fprintf(stderr, "dtx_enc_init: invalid parameter\n");
return -1;
}
*st = NULL;
/* allocate memory */
test();
if ((s = (dtx_encState *) malloc(sizeof(dtx_encState))) == 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[])
{
Word16 i;
test();
if (st == (dtx_encState *) NULL)
{
fprintf(stderr, "dtx_enc_reset: invalid parameter\n");
return -1;
}
st->hist_ptr = 0; move16();
st->log_en_index = 0; move16();
/* 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; move16();
/* Reset energy history */
Set_zero(st->log_en_hist, DTX_HIST_SIZE);
st->dtxHangoverCount = DTX_HANG_CONST; move16();
st->decAnaElapsedCount = 32767; move16();
for (i = 0; i < 28; i++)
{
st->D[i] = 0; move16();
}
for (i = 0; i < DTX_HIST_SIZE - 1; i++)
{
st->sumD[i] = 0; move32();
}
return 1;
}
/**************************************************************************
*
*
* Function : dtx_enc_exit
*
*
**************************************************************************/
void dtx_enc_exit(dtx_encState ** st)
{
test();
if (st == NULL || *st == NULL)
return;
/* deallocate memory */
free(*st);
*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
)
{
Word16 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;
move16();
for (i = 0; i < M; i++)
{
L_isf[i] = 0;
move32();
}
/* 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] = extract_l(L_shr(L_isf[j], 3)); move16(); /* 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 = shr(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);
test();
if (sub(st->log_en_index, 63) > 0)
{
st->log_en_index = 63;
move16();
}
test();
if (st->log_en_index < 0)
{
st->log_en_index = 0;
move16();
}
/* 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 = shr(log_en, 10);
/* Find fractional part */
log_en_int_m = (Word16) (log_en & 0x3ff); logic16();
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 = L_shl(level32, exp0); /* level in Q31 */
exp0 = sub(15, exp0);
level = extract_h(level32); /* level in Q15 */
/* generate white noise vector */
for (i = 0; i < L_FRAME; i++)
{
exc2[i] = shr(Random(&(st->cng_seed)), 4); move16();
}
/* 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 = add(exp, 4);
for (i = 0; i < L_FRAME; i++)
{
tmp = mult(exc2[i], gain); /* Q0 * Q15 */
exc2[i] = shl(tmp, exp); move16();
}
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); move16();
test();
if (sub(st->hist_ptr, DTX_HIST_SIZE) == 0)
{
st->hist_ptr = 0;
move16();
}
/* 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;move16();
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); move16();
test();
if (vad_flag != 0)
{
st->dtxHangoverCount = DTX_HANG_CONST; move16();
} else
{ /* non-speech */
test();
if (st->dtxHangoverCount == 0)
{ /* out of decoder analysis hangover */
st->decAnaElapsedCount = 0; move16();
*usedMode = MRDTX; move16();
} else
{ /* in possible analysis hangover */
st->dtxHangoverCount = sub(st->dtxHangoverCount, 1); move16();
/* decAnaElapsedCount + dtxHangoverCount < DTX_ELAPSED_FRAMES_THRESH */
test();
if (sub(add(st->decAnaElapsedCount, st->dtxHangoverCount),
DTX_ELAPSED_FRAMES_THRESH) < 0)
{
*usedMode = MRDTX; move16();
/* 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;
}
/**************************************************************************
*
*
* Function : dtx_dec_init
*
*
**************************************************************************/
Word16 dtx_dec_init(dtx_decState ** st, Word16 isf_init[])
{
dtx_decState *s;
test();
if (st == (dtx_decState **) NULL)
{
fprintf(stderr, "dtx_dec_init: invalid parameter\n");
return -1;
}
*st = NULL;
/* allocate memory */
test();
if ((s = (dtx_decState *) malloc(sizeof(dtx_decState))) == NULL)
{
fprintf(stderr, "dtx_dec_init: can not malloc state structure\n");
return -1;
}
dtx_dec_reset(s, isf_init);
*st = s;
return 0;
}
/**************************************************************************
*
*
* Function : dtx_dec_reset
*
*
**************************************************************************/
Word16 dtx_dec_reset(dtx_decState * st, Word16 isf_init[])
{
Word16 i;
test();
if (st == (dtx_decState *) NULL)
{
fprintf(stderr, "dtx_dec_reset: invalid parameter\n");
return -1;
}
st->since_last_sid = 0; move16();
st->true_sid_period_inv = (1 << 13); move16(); /* 0.25 in Q15 */
st->log_en = 3500; move16();
st->old_log_en = 3500; move16();
/* low level noise for better performance in DTX handover cases */
st->cng_seed = RANDOM_INITSEED; move16();
st->hist_ptr = 0; move16();
/* Init isf_hist[] and decoder log frame energy */
Copy(isf_init, st->isf, M);
Copy(isf_init, st->isf_old, M);
for (i = 0; i < DTX_HIST_SIZE; i++)
{
Copy(isf_init, &st->isf_hist[i * M], M);
st->log_en_hist[i] = st->log_en; move16();
}
st->dtxHangoverCount = DTX_HANG_CONST; move16();
st->decAnaElapsedCount = 32767; move16();
st->sid_frame = 0; move16();
st->valid_data = 0; move16();
st->dtxHangoverAdded = 0; move16();
st->dtxGlobalState = SPEECH; move16();
st->data_updated = 0; move16();
st->dither_seed = RANDOM_INITSEED; move16();
st->CN_dith = 0;
return 0;
}
/**************************************************************************
*
*
* Function : dtx_dec_exit
*
*
**************************************************************************/
void dtx_dec_exit(dtx_decState ** st)
{
test();
if (st == NULL || *st == NULL)
return;
/* deallocate memory */
free(*st);
*st = NULL;
return;
}
/*
Table of new SPD synthesis states
| previous SPD_synthesis_state
Incoming |
frame_type | SPEECH | DTX | DTX_MUTE
---------------------------------------------------------------
RX_SPEECH_GOOD , | | |
RX_SPEECH_PR_DEGRADED | SPEECH | SPEECH | SPEECH
----------------------------------------------------------------
RX_SPEECH_BAD, | SPEECH | DTX | DTX_MUTE
----------------------------------------------------------------
RX_SID_FIRST, | DTX | DTX/(DTX_MUTE)| DTX_MUTE
----------------------------------------------------------------
RX_SID_UPDATE, | DTX | DTX | DTX
----------------------------------------------------------------
RX_SID_BAD, | DTX | DTX/(DTX_MUTE)| DTX_MUTE
----------------------------------------------------------------
RX_NO_DATA, | SPEECH | DTX/(DTX_MUTE)| DTX_MUTE
RX_SPARE |(class2 garb.)| |
----------------------------------------------------------------
*/
/**************************************************************************
*
*
* Function : dtx_dec
*
*
**************************************************************************/
Word16 dtx_dec(
dtx_decState * st, /* i/o : State struct */
Word16 * exc2, /* o : CN excitation */
Word16 new_state, /* i : New DTX state */
Word16 isf[], /* o : CN ISF vector */
Word16 ** prms
)
{
Word16 log_en_index;
Word16 ind[7];
Word16 i, j;
Word16 int_fac;
Word16 gain;
Word32 L_isf[M], L_log_en_int, level32, ener32;
Word16 ptr;
Word16 tmp_int_length;
Word16 tmp, exp, exp0, log_en_int_e, log_en_int_m, level;
/* This function is called if synthesis state is not SPEECH the globally passed inputs to this function
* are st->sid_frame st->valid_data st->dtxHangoverAdded new_state (SPEECH, DTX, DTX_MUTE) */
test();test();
if ((st->dtxHangoverAdded != 0) &&
(st->sid_frame != 0))
{
/* sid_first after dtx hangover period */
/* or sid_upd after dtxhangover */
/* consider twice the last frame */
ptr = add(st->hist_ptr, 1);
test();
if (sub(ptr, DTX_HIST_SIZE) == 0)
ptr = 0; move16();
Copy(&st->isf_hist[st->hist_ptr * M], &st->isf_hist[ptr * M], M);
st->log_en_hist[ptr] = st->log_en_hist[st->hist_ptr]; move16();
/* compute mean log energy and isf from decoded signal (SID_FIRST) */
st->log_en = 0; move16();
for (i = 0; i < M; i++)
{
L_isf[i] = 0; move32();
}
/* 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 */
st->log_en = add(st->log_en, st->log_en_hist[i]); move16();
for (j = 0; j < M; j++)
{
L_isf[j] = L_add(L_isf[j], L_deposit_l(st->isf_hist[i * M + j])); move32();
}
}
/* st->log_en in Q9 */
st->log_en = shr(st->log_en, 1); move16();
/* Add 2 in Q9, in order to have only positive values for Pow2 */
/* this value is subtracted back after Pow2 function */
st->log_en = add(st->log_en, 1024);move16();
test();
if (st->log_en < 0)
st->log_en = 0; move16();
for (j = 0; j < M; j++)
{
st->isf[j] = extract_l(L_shr(L_isf[j], 3)); move32(); /* divide by 8 */
}
}
test();
if (st->sid_frame != 0)
{
/* Set old SID parameters, always shift */
/* even if there is no new valid_data */
Copy(st->isf, st->isf_old, M);
st->old_log_en = st->log_en; move16();
test();
if (st->valid_data != 0) /* new data available (no CRC) */
{
/* st->true_sid_period_inv = 1.0f/st->since_last_sid; */
/* Compute interpolation factor, since the division only works * for values of since_last_sid <
* 32 we have to limit the * interpolation to 32 frames */
tmp_int_length = st->since_last_sid; move16();
test();
if (sub(tmp_int_length, 32) > 0)
{
tmp_int_length = 32; move16();
}
test();
if (sub(tmp_int_length, 2) >= 0)
{
move16();
st->true_sid_period_inv = div_s(1 << 10, shl(tmp_int_length, 10));
} else
{
st->true_sid_period_inv = 1 << 14; /* 0.5 it Q15 */move16();
}
ind[0] = Serial_parm(6, prms); move16();
ind[1] = Serial_parm(6, prms); move16();
ind[2] = Serial_parm(6, prms); move16();
ind[3] = Serial_parm(5, prms); move16();
ind[4] = Serial_parm(5, prms); move16();
Disf_ns(ind, st->isf);
log_en_index = Serial_parm(6, prms);
/* read background noise stationarity information */
st->CN_dith = Serial_parm(1, prms); move16();
/* st->log_en = (float)log_en_index / 2.625 - 2.0; */
/* log2(E) in Q9 (log2(E) lies in between -2:22) */
st->log_en = shl(log_en_index, 15 - 6); move16();
/* Divide by 2.625 */
st->log_en = mult(st->log_en, 12483); move16();
/* Subtract 2 in Q9 is done later, after Pow2 function */
/* no interpolation at startup after coder reset */
/* or when SID_UPD has been received right after SPEECH */
test();test();
if ((st->data_updated == 0) ||
(sub(st->dtxGlobalState, SPEECH) == 0))
{
Copy(st->isf, st->isf_old, M);
st->old_log_en = st->log_en; move16();
}
} /* endif valid_data */
} /* endif sid_frame */
test();
test();
if ((st->sid_frame != 0) && (st->valid_data != 0))
{
st->since_last_sid = 0; move16();
}
/* Interpolate SID info */
int_fac = shl(st->since_last_sid, 10); /* Q10 */move16();
int_fac = mult(int_fac, st->true_sid_period_inv); /* Q10 * Q15 -> Q10 */
/* Maximize to 1.0 in Q10 */
test();
if (sub(int_fac, 1024) > 0)
{
int_fac = 1024; move16();
}
int_fac = shl(int_fac, 4); /* Q10 -> Q14 */
L_log_en_int = L_mult(int_fac, st->log_en); /* Q14 * Q9 -> Q24 */
for (i = 0; i < M; i++)
{
isf[i] = mult(int_fac, st->isf[i]);/* Q14 * Q15 -> Q14 */move16();
}
int_fac = sub(16384, int_fac); /* 1-k in Q14 */move16();
/* ( Q14 * Q9 -> Q24 ) + Q24 -> Q24 */
L_log_en_int = L_mac(L_log_en_int, int_fac, st->old_log_en);
for (i = 0; i < M; i++)
{
/* Q14 + (Q14 * Q15 -> Q14) -> Q14 */
isf[i] = add(isf[i], mult(int_fac, st->isf_old[i])); move16();
isf[i] = shl(isf[i], 1); /* Q14 -> Q15 */move16();
}
/* If background noise is non-stationary, insert comfort noise dithering */
if (st->CN_dith != 0)
{
CN_dithering(isf, &L_log_en_int, &st->dither_seed);
}
/* L_log_en_int corresponds to log2(E)+2 in Q24, i.e log2(gain)+1 in Q25 */
/* Q25 -> Q16 */
L_log_en_int = L_shr(L_log_en_int, 9);
/* Find integer part */
log_en_int_e = extract_h(L_log_en_int);
/* Find fractional part */
log_en_int_m = extract_l(L_shr(L_sub(L_log_en_int, L_deposit_h(log_en_int_e)), 1));
/* Subtract 2 from L_log_en_int 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);
/* level = (float)( pow( 2.0f, log_en ) ); */
level32 = Pow2(log_en_int_e, log_en_int_m); /* Q16 */
exp0 = norm_l(level32);
level32 = L_shl(level32, exp0); /* level in Q31 */
exp0 = sub(15, exp0);
level = extract_h(level32); /* level in Q15 */
/* generate white noise vector */
for (i = 0; i < L_FRAME; i++)
{
exc2[i] = shr(Random(&(st->cng_seed)), 4); move16();
}
/* 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 = add(exp, 4);
for (i = 0; i < L_FRAME; i++)
{
tmp = mult(exc2[i], gain); /* Q0 * Q15 */
exc2[i] = shl(tmp, exp); move16();
}
test();
if (sub(new_state, DTX_MUTE) == 0)
{
/* mute comfort noise as it has been quite a long time since last SID update was performed */
tmp_int_length = st->since_last_sid; move16();
test();
if (sub(tmp_int_length, 32) > 0)
{
tmp_int_length = 32; move16();
}
move16();
st->true_sid_period_inv = div_s(1 << 10, shl(tmp_int_length, 10));
st->since_last_sid = 0; move16();
st->old_log_en = st->log_en; move16();
/* subtract 1/8 in Q9 (energy), i.e -3/8 dB */
st->log_en = sub(st->log_en, 64); move16();
}
/* reset interpolation length timer if data has been updated. */
test();test();test();test();
if ((st->sid_frame != 0) &&
((st->valid_data != 0) ||
((st->valid_data == 0) && (st->dtxHangoverAdded) != 0)))
{
st->since_last_sid = 0; move16();
st->data_updated = 1; move16();
}
return 0;
}
void dtx_dec_activity_update(
dtx_decState * st,
Word16 isf[],
Word16 exc[])
{
Word16 i;
Word32 L_frame_en;
Word16 log_en_e, log_en_m, log_en;
st->hist_ptr = add(st->hist_ptr, 1); move16();
test();
if (sub(st->hist_ptr, DTX_HIST_SIZE) == 0)
{
st->hist_ptr = 0; move16();
}
Copy(isf, &st->isf_hist[st->hist_ptr * M], M);
/* compute log energy based on excitation frame energy in Q0 */
L_frame_en = 0; move32();
for (i = 0; i < L_FRAME; i++)
{
L_frame_en = L_mac(L_frame_en, exc[i], exc[i]);
}
L_frame_en = L_shr(L_frame_en, 1);
/* log_en = (float)log10(L_frame_en/(float)L_FRAME)/(float)log10(2.0f); */
Log2(L_frame_en, &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));
/* Divide by L_FRAME = 256, i.e subtract 8 in Q7 = 1024 */
log_en = sub(log_en, 1024);
/* insert into log energy buffer */
st->log_en_hist[st->hist_ptr] = log_en;move16();
return;
}
/*
Table of new SPD synthesis states
| previous SPD_synthesis_state
Incoming |
frame_type | SPEECH | DTX | DTX_MUTE
---------------------------------------------------------------
RX_SPEECH_GOOD , | | |
RX_SPEECH_PR_DEGRADED | SPEECH | SPEECH | SPEECH
----------------------------------------------------------------
RX_SPEECH_BAD, | SPEECH | DTX | DTX_MUTE
----------------------------------------------------------------
RX_SID_FIRST, | DTX | DTX/(DTX_MUTE)| DTX_MUTE
----------------------------------------------------------------
RX_SID_UPDATE, | DTX | DTX | DTX
----------------------------------------------------------------
RX_SID_BAD, | DTX | DTX/(DTX_MUTE)| DTX_MUTE
----------------------------------------------------------------
RX_NO_DATA, | SPEECH | DTX/(DTX_MUTE)| DTX_MUTE
RX_SPARE |(class2 garb.)| |
----------------------------------------------------------------
*/
Word16 rx_dtx_handler(
dtx_decState * st, /* i/o : State struct */
Word16 frame_type /* i : Frame type */
)
{
Word16 newState;
Word16 encState;
/* DTX if SID frame or previously in DTX{_MUTE} and (NO_RX OR BAD_SPEECH) */
test();test();test();
test();test();test();
test();test();
if ((sub(frame_type, RX_SID_FIRST) == 0) ||
(sub(frame_type, RX_SID_UPDATE) == 0) ||
(sub(frame_type, RX_SID_BAD) == 0) ||
(((sub(st->dtxGlobalState, DTX) == 0) ||
(sub(st->dtxGlobalState, DTX_MUTE) == 0)) &&
((sub(frame_type, RX_NO_DATA) == 0) ||
(sub(frame_type, RX_SPEECH_BAD) == 0) ||
(sub(frame_type, RX_SPEECH_LOST) == 0))))
{
newState = DTX; move16();
/* stay in mute for these input types */
test();test();test();test();test();
if ((sub(st->dtxGlobalState, DTX_MUTE) == 0) &&
((sub(frame_type, RX_SID_BAD) == 0) ||
(sub(frame_type, RX_SID_FIRST) == 0) ||
(sub(frame_type, RX_SPEECH_LOST) == 0) ||
(sub(frame_type, RX_NO_DATA) == 0)))
{
newState = DTX_MUTE; move16();
}
/* evaluate if noise parameters are too old */
/* since_last_sid is reset when CN parameters have been updated */
st->since_last_sid = add(st->since_last_sid, 1); move16();
/* no update of sid parameters in DTX for a long while */
test();
if (sub(st->since_last_sid, DTX_MAX_EMPTY_THRESH) > 0)
{
newState = DTX_MUTE; move16();
}
} else
{
newState = SPEECH; move16();
st->since_last_sid = 0; move16();
}
/* reset the decAnaElapsed Counter when receiving CNI data the first time, to robustify counter missmatch
* after handover this might delay the bwd CNI analysis in the new decoder slightly. */
test();test();
if ((st->data_updated == 0) &&
(sub(frame_type, RX_SID_UPDATE) == 0))
{
st->decAnaElapsedCount = 0; move16();
}
/* update the SPE-SPD DTX hangover synchronization */
/* to know when SPE has added dtx hangover */
st->decAnaElapsedCount = add(st->decAnaElapsedCount, 1); move16();
st->dtxHangoverAdded = 0; move16();
test();test();test();test();
if ((sub(frame_type, RX_SID_FIRST) == 0) ||
(sub(frame_type, RX_SID_UPDATE) == 0) ||
(sub(frame_type, RX_SID_BAD) == 0) ||
(sub(frame_type, RX_NO_DATA) == 0))
{
encState = DTX; move16();
} else
{
encState = SPEECH; move16();
}
test();
if (sub(encState, SPEECH) == 0)
{
st->dtxHangoverCount = DTX_HANG_CONST; move16();
} else
{
test();test();
if (sub(st->decAnaElapsedCount, DTX_ELAPSED_FRAMES_THRESH) > 0)
{
st->dtxHangoverAdded = 1; move16();
st->decAnaElapsedCount = 0; move16();
st->dtxHangoverCount = 0; move16();
} else if (test(), st->dtxHangoverCount == 0)
{
st->decAnaElapsedCount = 0; move16();
} else
{
st->dtxHangoverCount = sub(st->dtxHangoverCount, 1); move16();
}
}
test();
if (sub(newState, SPEECH) != 0)
{
/* DTX or DTX_MUTE CN data is not in a first SID, first SIDs are marked as SID_BAD but will do
* backwards analysis if a hangover period has been added according to the state machine above */
st->sid_frame = 0; move16();
st->valid_data = 0; move16();
test();test();test();
if (sub(frame_type, RX_SID_FIRST) == 0)
{
st->sid_frame = 1; move16();
} else if (test(), sub(frame_type, RX_SID_UPDATE) == 0)
{
st->sid_frame = 1; move16();
st->valid_data = 1; move16();
} else if (test(), sub(frame_type, RX_SID_BAD) == 0)
{
st->sid_frame = 1; move16();
st->dtxHangoverAdded = 0; /* use old data */move16();
}
}
return newState;
/* newState is used by both SPEECH AND DTX synthesis routines */
}
static void aver_isf_history(
Word16 isf_old[],
Word16 indices[],
Word32 isf_aver[]
)
{
Word16 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++)
{
test();
if (add(indices[k], 1) != 0)
{
for (i = 0; i < M; i++)
{
isf_tmp[k * M + i] = isf_old[indices[k] * M + i]; move16();
isf_old[indices[k] * M + i] = isf_old[indices[2] * M + i]; move16();
}
}
}
/* Perform the ISF averaging */
for (j = 0; j < M; j++)
{
L_tmp = 0; move32();
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; move32();
}
/* Retrieve from isf_tmp[][] the ISF vectors saved prior to averaging */
for (k = 0; k < 2; k++)
{
test();
if (add(indices[k], 1) != 0)
{
for (i = 0; i < M; i++)
{
isf_old[indices[k] * M + i] = isf_tmp[k * M + i]; move16();
}
}
}
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; move16();
j = -1; move16();
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]); move16();
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]; move32();
}
st->sumD[0] = 0; move32();
/* 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; move16();
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]; move32();
}
}
/* Compute the first column of the distance matrix D */
/* (squared Euclidean distances from isf1[] to isf_old_tx[][]). */
ptr = st->hist_ptr; move16();
for (i = 1; i < DTX_HIST_SIZE; i++)
{
/* Compute the distance between the latest isf and the other isfs. */
ptr = sub(ptr, 1);
test();
if (ptr < 0)
{
ptr = DTX_HIST_SIZE_MIN_ONE; move16();
}
L_tmp = 0; move32();
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; move32();
/* Update also the column sums. */
st->sumD[0] = L_add(st->sumD[0], st->D[i - 1]); move32();
st->sumD[i] = L_add(st->sumD[i], st->D[i - 1]); move32();
}
/* Find the minimum and maximum distances */
summax = st->sumD[0]; move32();
summin = st->sumD[0]; move32();
indices[0] = 0; move16();
indices[2] = 0; move16();
for (i = 1; i < DTX_HIST_SIZE; i++)
{
test();
if (L_sub(st->sumD[i], summax) > 0)
{
indices[0] = i; move16();
summax = st->sumD[i]; move32();
}
test();
if (L_sub(st->sumD[i], summin) < 0)
{
indices[2] = i; move16();
summin = st->sumD[i]; move32();
}
}
/* Find the second largest distance */
summax2nd = -2147483647L; move32();
indices[1] = -1; move16();
for (i = 0; i < DTX_HIST_SIZE; i++)
{
test();
if ((L_sub(st->sumD[i], summax2nd) > 0) && (sub(i, indices[0]) != 0))
{
indices[1] = i; move16();
summax2nd = st->sumD[i]; move32();
}
}
for (i = 0; i < 3; i++)
{
indices[i] = sub(st->hist_ptr, indices[i]); move16();
test();
if (indices[i] < 0)
{
indices[i] = add(indices[i], DTX_HIST_SIZE); move16();
}
}
/* If maximum distance/MED_THRESH is smaller than minimum distance */
/* then the median ISF vector replacement is not performed */
tmp = norm_l(summax);
summax = L_shl(summax, tmp);
summin = L_shl(summin, tmp);
L_tmp = L_mult(round(summax), INV_MED_THRESH);
test();
if (L_sub(L_tmp, summin) <= 0)
{
indices[0] = -1; move16();
}
/* 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(round(summax2nd), INV_MED_THRESH);
test();
if (L_sub(L_tmp, summin) <= 0)
{
indices[1] = -1; move16();
}
return;
}
static Word16 dithering_control(
dtx_encState * st
)
{
Word16 i, tmp, mean, CN_dith, gain_diff;
Word32 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 (L_shr(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 = shr(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 (sub(gain_diff, GAIN_THR) > 0)
{
CN_dith = 1;
}
return CN_dith;
}
static void CN_dithering(
Word16 isf[M],
Word32 * L_log_en_int,
Word16 * dither_seed
)
{
Word16 temp, temp1, i, dither_fac, rand_dith;
Word16 rand_dith2;
/* Insert comfort noise dithering for energy parameter */
rand_dith = shr(Random(dither_seed), 1);
rand_dith2 = shr(Random(dither_seed), 1);
rand_dith = add(rand_dith, rand_dith2);
*L_log_en_int = L_add(*L_log_en_int, L_mult(rand_dith, GAIN_FACTOR));
if (*L_log_en_int < 0)
{
*L_log_en_int = 0;
}
/* Insert comfort noise dithering for spectral parameters (ISF-vector) */
dither_fac = ISF_FACTOR_LOW;
rand_dith = shr(Random(dither_seed), 1);
rand_dith2 = shr(Random(dither_seed), 1);
rand_dith = add(rand_dith, rand_dith2);
temp = add(isf[0], mult_r(rand_dith, dither_fac));
/* Make sure that isf[0] will not get negative values */
if (sub(temp, ISF_GAP) < 0)
{
isf[0] = ISF_GAP;
} else
{
isf[0] = temp;
}
for (i = 1; i < M - 1; i++)
{
dither_fac = add(dither_fac, ISF_FACTOR_STEP);
rand_dith = shr(Random(dither_seed), 1);
rand_dith2 = shr(Random(dither_seed), 1);
rand_dith = add(rand_dith, rand_dith2);
temp = add(isf[i], mult_r(rand_dith, dither_fac));
temp1 = sub(temp, isf[i - 1]);
/* Make sure that isf spacing remains at least ISF_DITH_GAP Hz */
if (sub(temp1, ISF_DITH_GAP) < 0)
{
isf[i] = add(isf[i - 1], ISF_DITH_GAP);
} else
{
isf[i] = temp;
}
}
/* Make sure that isf[M-2] will not get values above 16384 */
if (sub(isf[M - 2], 16384) > 0)
{
isf[M - 2] = 16384;
}
return;
}