2 ** Copyright 2003-2010, VisualOn, Inc.
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4 ** Licensed under the Apache License, Version 2.0 (the "License");
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5 ** you may not use this file except in compliance with the License.
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6 ** You may obtain a copy of the License at
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8 ** http://www.apache.org/licenses/LICENSE-2.0
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10 ** Unless required by applicable law or agreed to in writing, software
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11 ** distributed under the License is distributed on an "AS IS" BASIS,
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12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 ** See the License for the specific language governing permissions and
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14 ** limitations under the License.
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17 /***********************************************************************
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20 * Description:DTX functions *
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22 ************************************************************************/
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26 #include "typedef.h"
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27 #include "basic_op.h"
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28 #include "oper_32b.h"
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29 #include "math_op.h"
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31 #include "acelp.h" /* prototype of functions */
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35 #include "mem_align.h"
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37 static void aver_isf_history(
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43 static void find_frame_indices(
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44 Word16 isf_old_tx[],
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49 static Word16 dithering_control(
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53 /* excitation energy adjustment depending on speech coder mode used, Q7 */
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54 static Word16 en_adjust[9] =
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56 230, /* mode0 = 7k : -5.4dB */
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57 179, /* mode1 = 9k : -4.2dB */
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58 141, /* mode2 = 12k : -3.3dB */
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59 128, /* mode3 = 14k : -3.0dB */
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60 122, /* mode4 = 16k : -2.85dB */
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61 115, /* mode5 = 18k : -2.7dB */
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62 115, /* mode6 = 20k : -2.7dB */
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63 115, /* mode7 = 23k : -2.7dB */
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64 115 /* mode8 = 24k : -2.7dB */
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67 /**************************************************************************
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69 * Function : dtx_enc_init
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71 **************************************************************************/
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72 Word16 dtx_enc_init(dtx_encState ** st, Word16 isf_init[], VO_MEM_OPERATOR *pMemOP)
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76 if (st == (dtx_encState **) NULL)
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78 fprintf(stderr, "dtx_enc_init: invalid parameter\n");
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83 /* allocate memory */
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84 if ((s = (dtx_encState *)mem_malloc(pMemOP, sizeof(dtx_encState), 32, VO_INDEX_ENC_AMRWB)) == NULL)
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86 fprintf(stderr, "dtx_enc_init: can not malloc state structure\n");
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89 dtx_enc_reset(s, isf_init);
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94 /**************************************************************************
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96 * Function : dtx_enc_reset
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98 **************************************************************************/
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99 Word16 dtx_enc_reset(dtx_encState * st, Word16 isf_init[])
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103 if (st == (dtx_encState *) NULL)
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105 fprintf(stderr, "dtx_enc_reset: invalid parameter\n");
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109 st->log_en_index = 0;
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111 /* Init isf_hist[] */
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112 for (i = 0; i < DTX_HIST_SIZE; i++)
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114 Copy(isf_init, &st->isf_hist[i * M], M);
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116 st->cng_seed = RANDOM_INITSEED;
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118 /* Reset energy history */
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119 Set_zero(st->log_en_hist, DTX_HIST_SIZE);
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121 st->dtxHangoverCount = DTX_HANG_CONST;
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122 st->decAnaElapsedCount = 32767;
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124 for (i = 0; i < 28; i++)
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129 for (i = 0; i < DTX_HIST_SIZE - 1; i++)
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137 /**************************************************************************
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139 * Function : dtx_enc_exit
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141 **************************************************************************/
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142 void dtx_enc_exit(dtx_encState ** st, VO_MEM_OPERATOR *pMemOP)
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144 if (st == NULL || *st == NULL)
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146 /* deallocate memory */
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147 mem_free(pMemOP, *st, VO_INDEX_ENC_AMRWB);
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153 /**************************************************************************
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155 * Function : dtx_enc
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157 **************************************************************************/
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159 dtx_encState * st, /* i/o : State struct */
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160 Word16 isf[M], /* o : CN ISF vector */
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161 Word16 * exc2, /* o : CN excitation */
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167 Word16 log_en, gain, level, exp, exp0, tmp;
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168 Word16 log_en_int_e, log_en_int_m;
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169 Word32 L_isf[M], ener32, level32;
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170 Word16 isf_order[3];
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173 /* VOX mode computation of SID parameters */
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175 for (i = 0; i < M; i++)
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179 /* average energy and isf */
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180 for (i = 0; i < DTX_HIST_SIZE; i++)
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182 /* Division by DTX_HIST_SIZE = 8 has been done in dtx_buffer. log_en is in Q10 */
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183 log_en = add(log_en, st->log_en_hist[i]);
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186 find_frame_indices(st->isf_hist, isf_order, st);
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187 aver_isf_history(st->isf_hist, isf_order, L_isf);
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189 for (j = 0; j < M; j++)
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191 isf[j] = (Word16)(L_isf[j] >> 3); /* divide by 8 */
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194 /* quantize logarithmic energy to 6 bits (-6 : 66 dB) which corresponds to -2:22 in log2(E). */
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195 /* st->log_en_index = (short)( (log_en + 2.0) * 2.625 ); */
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197 /* increase dynamics to 7 bits (Q8) */
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198 log_en = (log_en >> 2);
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200 /* Add 2 in Q8 = 512 to get log2(E) between 0:24 */
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201 log_en = add(log_en, 512);
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203 /* Multiply by 2.625 to get full 6 bit range. 2.625 = 21504 in Q13. The result is in Q6 */
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204 log_en = mult(log_en, 21504);
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206 /* Quantize Energy */
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207 st->log_en_index = shr(log_en, 6);
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209 if(st->log_en_index > 63)
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211 st->log_en_index = 63;
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213 if (st->log_en_index < 0)
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215 st->log_en_index = 0;
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217 /* Quantize ISFs */
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218 Qisf_ns(isf, isf, indice);
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221 Parm_serial(indice[0], 6, prms);
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222 Parm_serial(indice[1], 6, prms);
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223 Parm_serial(indice[2], 6, prms);
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224 Parm_serial(indice[3], 5, prms);
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225 Parm_serial(indice[4], 5, prms);
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227 Parm_serial((st->log_en_index), 6, prms);
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229 CN_dith = dithering_control(st);
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230 Parm_serial(CN_dith, 1, prms);
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232 /* level = (float)( pow( 2.0f, (float)st->log_en_index / 2.625 - 2.0 ) ); */
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233 /* log2(E) in Q9 (log2(E) lies in between -2:22) */
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234 log_en = shl(st->log_en_index, 15 - 6);
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236 /* Divide by 2.625; log_en will be between 0:24 */
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237 log_en = mult(log_en, 12483);
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238 /* the result corresponds to log2(gain) in Q10 */
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240 /* Find integer part */
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241 log_en_int_e = (log_en >> 10);
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243 /* Find fractional part */
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244 log_en_int_m = (Word16) (log_en & 0x3ff);
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245 log_en_int_m = shl(log_en_int_m, 5);
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247 /* Subtract 2 from log_en in Q9, i.e divide the gain by 2 (energy by 4) */
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248 /* Add 16 in order to have the result of pow2 in Q16 */
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249 log_en_int_e = add(log_en_int_e, 16 - 1);
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251 level32 = Pow2(log_en_int_e, log_en_int_m); /* Q16 */
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252 exp0 = norm_l(level32);
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253 level32 = (level32 << exp0); /* level in Q31 */
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254 exp0 = (15 - exp0);
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255 level = extract_h(level32); /* level in Q15 */
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257 /* generate white noise vector */
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258 for (i = 0; i < L_FRAME; i++)
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260 exc2[i] = (Random(&(st->cng_seed)) >> 4);
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263 /* gain = level / sqrt(ener) * sqrt(L_FRAME) */
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265 /* energy of generated excitation */
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266 ener32 = Dot_product12(exc2, exc2, L_FRAME, &exp);
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268 Isqrt_n(&ener32, &exp);
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270 gain = extract_h(ener32);
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272 gain = mult(level, gain); /* gain in Q15 */
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274 exp = add(exp0, exp);
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276 /* Multiply by sqrt(L_FRAME)=16, i.e. shift left by 4 */
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279 for (i = 0; i < L_FRAME; i++)
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281 tmp = mult(exc2[i], gain); /* Q0 * Q15 */
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282 exc2[i] = shl(tmp, exp);
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288 /**************************************************************************
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290 * Function : dtx_buffer Purpose : handles the DTX buffer
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292 **************************************************************************/
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294 dtx_encState * st, /* i/o : State struct */
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295 Word16 isf_new[], /* i : isf vector */
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296 Word32 enr, /* i : residual energy (in L_FRAME) */
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304 st->hist_ptr = add(st->hist_ptr, 1);
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305 if(st->hist_ptr == DTX_HIST_SIZE)
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309 /* copy lsp vector into buffer */
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310 Copy(isf_new, &st->isf_hist[st->hist_ptr * M], M);
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312 /* log_en = (float)log10(enr*0.0059322)/(float)log10(2.0f); */
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313 Log2(enr, &log_en_e, &log_en_m);
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315 /* convert exponent and mantissa to Word16 Q7. Q7 is used to simplify averaging in dtx_enc */
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316 log_en = shl(log_en_e, 7); /* Q7 */
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317 log_en = add(log_en, shr(log_en_m, 15 - 7));
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319 /* Find energy per sample by multiplying with 0.0059322, i.e subtract log2(1/0.0059322) = 7.39722 The
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320 * constant 0.0059322 takes into account windowings and analysis length from autocorrelation
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321 * computations; 7.39722 in Q7 = 947 */
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322 /* Subtract 3 dB = 0.99658 in log2(E) = 127 in Q7. */
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323 /* log_en = sub( log_en, 947 + en_adjust[codec_mode] ); */
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325 /* Find energy per sample (divide by L_FRAME=256), i.e subtract log2(256) = 8.0 (1024 in Q7) */
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326 /* Subtract 3 dB = 0.99658 in log2(E) = 127 in Q7. */
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328 log_en = sub(log_en, add(1024, en_adjust[codec_mode]));
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330 /* Insert into the buffer */
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331 st->log_en_hist[st->hist_ptr] = log_en;
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335 /**************************************************************************
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337 * Function : tx_dtx_handler Purpose : adds extra speech hangover
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338 * to analyze speech on
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339 * the decoding side.
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340 **************************************************************************/
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341 void tx_dtx_handler(dtx_encState * st, /* i/o : State struct */
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342 Word16 vad_flag, /* i : vad decision */
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343 Word16 * usedMode /* i/o : mode changed or not */
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347 /* this state machine is in synch with the GSMEFR txDtx machine */
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348 st->decAnaElapsedCount = add(st->decAnaElapsedCount, 1);
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352 st->dtxHangoverCount = DTX_HANG_CONST;
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355 if (st->dtxHangoverCount == 0)
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356 { /* out of decoder analysis hangover */
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357 st->decAnaElapsedCount = 0;
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358 *usedMode = MRDTX;
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360 { /* in possible analysis hangover */
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361 st->dtxHangoverCount = sub(st->dtxHangoverCount, 1);
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363 /* decAnaElapsedCount + dtxHangoverCount < DTX_ELAPSED_FRAMES_THRESH */
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364 if (sub(add(st->decAnaElapsedCount, st->dtxHangoverCount),
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365 DTX_ELAPSED_FRAMES_THRESH) < 0)
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368 /* if short time since decoder update, do not add extra HO */
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370 /* else override VAD and stay in speech mode *usedMode and add extra hangover */
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379 static void aver_isf_history(
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386 Word16 isf_tmp[2 * M];
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389 /* Memorize in isf_tmp[][] the ISF vectors to be replaced by */
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390 /* the median ISF vector prior to the averaging */
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391 for (k = 0; k < 2; k++)
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393 if ((indices[k] + 1) != 0)
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395 for (i = 0; i < M; i++)
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397 isf_tmp[k * M + i] = isf_old[indices[k] * M + i];
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398 isf_old[indices[k] * M + i] = isf_old[indices[2] * M + i];
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403 /* Perform the ISF averaging */
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404 for (j = 0; j < M; j++)
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408 for (i = 0; i < DTX_HIST_SIZE; i++)
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410 L_tmp = L_add(L_tmp, L_deposit_l(isf_old[i * M + j]));
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412 isf_aver[j] = L_tmp;
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415 /* Retrieve from isf_tmp[][] the ISF vectors saved prior to averaging */
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416 for (k = 0; k < 2; k++)
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418 if ((indices[k] + 1) != 0)
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420 for (i = 0; i < M; i++)
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422 isf_old[indices[k] * M + i] = isf_tmp[k * M + i];
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430 static void find_frame_indices(
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431 Word16 isf_old_tx[],
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436 Word32 L_tmp, summin, summax, summax2nd;
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440 /* Remove the effect of the oldest frame from the column */
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441 /* sum sumD[0..DTX_HIST_SIZE-1]. sumD[DTX_HIST_SIZE] is */
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442 /* not updated since it will be removed later. */
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444 tmp = DTX_HIST_SIZE_MIN_ONE;
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446 for (i = 0; i < DTX_HIST_SIZE_MIN_ONE; i++)
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449 st->sumD[i] = L_sub(st->sumD[i], st->D[j]);
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453 /* Shift the column sum sumD. The element sumD[DTX_HIST_SIZE-1] */
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454 /* corresponding to the oldest frame is removed. The sum of */
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455 /* the distances between the latest isf and other isfs, */
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456 /* i.e. the element sumD[0], will be computed during this call. */
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457 /* Hence this element is initialized to zero. */
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459 for (i = DTX_HIST_SIZE_MIN_ONE; i > 0; i--)
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461 st->sumD[i] = st->sumD[i - 1];
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465 /* Remove the oldest frame from the distance matrix. */
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466 /* Note that the distance matrix is replaced by a one- */
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467 /* dimensional array to save static memory. */
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470 for (i = 27; i >= 12; i = (Word16) (i - tmp))
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473 for (j = tmp; j > 0; j--)
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475 st->D[i - j + 1] = st->D[i - j - tmp];
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479 /* Compute the first column of the distance matrix D */
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480 /* (squared Euclidean distances from isf1[] to isf_old_tx[][]). */
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482 ptr = st->hist_ptr;
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483 for (i = 1; i < DTX_HIST_SIZE; i++)
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485 /* Compute the distance between the latest isf and the other isfs. */
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489 ptr = DTX_HIST_SIZE_MIN_ONE;
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492 for (j = 0; j < M; j++)
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494 tmp = sub(isf_old_tx[st->hist_ptr * M + j], isf_old_tx[ptr * M + j]);
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495 L_tmp = L_mac(L_tmp, tmp, tmp);
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497 st->D[i - 1] = L_tmp;
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499 /* Update also the column sums. */
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500 st->sumD[0] = L_add(st->sumD[0], st->D[i - 1]);
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501 st->sumD[i] = L_add(st->sumD[i], st->D[i - 1]);
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504 /* Find the minimum and maximum distances */
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505 summax = st->sumD[0];
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506 summin = st->sumD[0];
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509 for (i = 1; i < DTX_HIST_SIZE; i++)
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511 if (L_sub(st->sumD[i], summax) > 0)
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514 summax = st->sumD[i];
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516 if (L_sub(st->sumD[i], summin) < 0)
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519 summin = st->sumD[i];
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523 /* Find the second largest distance */
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524 summax2nd = -2147483647L;
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526 for (i = 0; i < DTX_HIST_SIZE; i++)
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528 if ((L_sub(st->sumD[i], summax2nd) > 0) && (sub(i, indices[0]) != 0))
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531 summax2nd = st->sumD[i];
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535 for (i = 0; i < 3; i++)
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537 indices[i] = sub(st->hist_ptr, indices[i]);
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538 if (indices[i] < 0)
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540 indices[i] = add(indices[i], DTX_HIST_SIZE);
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544 /* If maximum distance/MED_THRESH is smaller than minimum distance */
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545 /* then the median ISF vector replacement is not performed */
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546 tmp = norm_l(summax);
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547 summax = (summax << tmp);
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548 summin = (summin << tmp);
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549 L_tmp = L_mult(voround(summax), INV_MED_THRESH);
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550 if(L_tmp <= summin)
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554 /* If second largest distance/MED_THRESH is smaller than */
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555 /* minimum distance then the median ISF vector replacement is */
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556 /* not performed */
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557 summax2nd = L_shl(summax2nd, tmp);
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558 L_tmp = L_mult(voround(summax2nd), INV_MED_THRESH);
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559 if(L_tmp <= summin)
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566 static Word16 dithering_control(
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570 Word16 tmp, mean, CN_dith, gain_diff;
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571 Word32 i, ISF_diff;
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573 /* determine how stationary the spectrum of background noise is */
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575 for (i = 0; i < 8; i++)
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577 ISF_diff = L_add(ISF_diff, st->sumD[i]);
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579 if ((ISF_diff >> 26) > 0)
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587 /* determine how stationary the energy of background noise is */
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589 for (i = 0; i < DTX_HIST_SIZE; i++)
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591 mean = add(mean, st->log_en_hist[i]);
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593 mean = (mean >> 3);
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595 for (i = 0; i < DTX_HIST_SIZE; i++)
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597 tmp = abs_s(sub(st->log_en_hist[i], mean));
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598 gain_diff = add(gain_diff, tmp);
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600 if (gain_diff > GAIN_THR)
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