void deemphasis_32( int16 x_hi[], /* (i) : input signal (bit31..16) */ int16 x_lo[], /* (i) : input signal (bit15..4) */ int16 y[], /* (o) : output signal (x16) */ int16 mu, /* (i) Q15 : deemphasis factor */ int16 L, /* (i) : vector size */ int16 * mem /* (i/o) : memory (y[-1]) */ ) { int16 i; int32 L_tmp; int16 lo, hi; L_tmp = ((int32)x_hi[0]) << 16; L_tmp += ((int32)x_lo[0]) << 4; L_tmp = shl_int32(L_tmp, 3); L_tmp = fxp_mac_16by16(*mem, mu, L_tmp), L_tmp = shl_int32(L_tmp, 1); /* saturation can occur here */ y[0] = amr_wb_round(L_tmp); lo = x_lo[1]; hi = x_hi[1]; for (i = 1; i < L - 1; i++) { L_tmp = ((int32)hi) << 16; L_tmp += ((int32)lo) << 4; L_tmp = shl_int32(L_tmp, 3); L_tmp = fxp_mac_16by16(y[i - 1], mu, L_tmp), L_tmp = shl_int32(L_tmp, 1); /* saturation can occur here */ y[i] = amr_wb_round(L_tmp); lo = x_lo[i+1]; hi = x_hi[i+1]; } L_tmp = ((int32)hi) << 16; L_tmp += ((int32)lo) << 4; L_tmp = shl_int32(L_tmp, 3); L_tmp = fxp_mac_16by16(y[i - 1], mu, L_tmp), L_tmp = shl_int32(L_tmp, 1); /* saturation can occur here */ y[i] = amr_wb_round(L_tmp); *mem = y[L - 1]; return; }
//============================================================================ //函数功能:设置存储器 //函数参数:"index"表示指标量化,作为输入参数;"nbits"表示位数,作为输入参数;" // code[]"表示创新载体,作为输入参数;"L_subfr"表示子帧长度,作为输入参 // 数;"gain_pit"表示基音增益,作为输出参数;"gain_cod"表示编码增益,作 // 为输出参数;"bfi"表示坏帧指示,作为输入参数;"prev_bfi"表示先前BF指 // 示器,作为输入参数;"state"表示BFH的状态,作为输入参数;"unusable_frame" // 表示UF指示器,作为输入参数;"vad_hist"表示非语音帧的数目,作为输入参 // 数;"mem"表示静态存储器,既作为输入参数又作为输出参数 //============================================================================ void dec_gain2_amr_wb( int16 index, /* (i) : index of quantization. */ int16 nbits, /* (i) : number of bits (6 or 7) */ int16 code[], /* (i) Q9 : Innovative vector. */ int16 L_subfr, /* (i) : Subframe lenght. */ int16 * gain_pit, /* (o) Q14 : Pitch gain. */ int32 * gain_cod, /* (o) Q16 : Code gain. */ int16 bfi, /* (i) : bad frame indicator */ int16 prev_bfi, /* (i) : Previous BF indicator */ int16 state, /* (i) : State of BFH */ int16 unusable_frame, /* (i) : UF indicator */ int16 vad_hist, /* (i) : number of non-speech frames */ int16 * mem /* (i/o) : static memory (4 words) */ ) { const int16 *p; int16 *past_gain_pit, *past_gain_code, *past_qua_en, *gbuf, *pbuf, *prev_gc; int16 *pbuf2; int16 i, tmp, exp, frac, gcode0, exp_gcode0, qua_ener, gcode_inov; int16 tmp1, g_code; int16 tmp2; int32 L_tmp; past_qua_en = mem; past_gain_pit = mem + 4; past_gain_code = mem + 5; prev_gc = mem + 6; pbuf = mem + 7; gbuf = mem + 12; pbuf2 = mem + 17; /* * Find energy of code and compute: * * L_tmp = 1.0 / sqrt(energy of code/ L_subfr) */ L_tmp = Dot_product12(code, code, L_subfr, &exp); exp -= 24; /* exp: -18 (code in Q9), -6 (/L_subfr) */ one_ov_sqrt_norm(&L_tmp, &exp); gcode_inov = extract_h(shl_int32(L_tmp, exp - 3)); /* g_code_inov in Q12 */ /* * Case of erasure. */ if (bfi != 0) { tmp = median5(&pbuf[2]); *past_gain_pit = tmp; if (*past_gain_pit > 15565) { *past_gain_pit = 15565; /* 0.95 in Q14 */ } if (unusable_frame != 0) { *gain_pit = mult_int16(pdown_unusable[state], *past_gain_pit); } else { *gain_pit = mult_int16(pdown_usable[state], *past_gain_pit); } tmp = median5(&gbuf[2]); if (vad_hist > 2) { *past_gain_code = tmp; } else { if (unusable_frame != 0) { *past_gain_code = mult_int16(cdown_unusable[state], tmp); } else { *past_gain_code = mult_int16(cdown_usable[state], tmp); } } /* update table of past quantized energies */ //更新过去的量子化的能量表 tmp = past_qua_en[3]; tmp1 = past_qua_en[2]; L_tmp = tmp; L_tmp += tmp1; past_qua_en[3] = tmp; tmp = past_qua_en[1]; tmp1 = past_qua_en[0]; L_tmp += tmp; L_tmp += tmp1; past_qua_en[2] = tmp; qua_ener = (int16)(L_tmp >> 3); past_qua_en[1] = tmp1; qua_ener -= 3072; /* -3 in Q10 */ if (qua_ener < -14336) { qua_ener = -14336; /* -14 in Q10 */ } past_qua_en[0] = qua_ener; for (i = 1; i < 5; i++) { gbuf[i - 1] = gbuf[i]; pbuf[i - 1] = pbuf[i]; } gbuf[4] = *past_gain_code; pbuf[4] = *past_gain_pit; /* adjust gain according to energy of code */ /* past_gain_code(Q3) * gcode_inov(Q12) => Q16 */ //调整增益根据能量代码 *gain_cod = mul_16by16_to_int32(*past_gain_code, gcode_inov); return; }
/* adjust gain according to energy of code */ /* past_gain_code(Q3) * gcode_inov(Q12) => Q16 */ //调整增益根据能量代码 *gain_cod = mul_16by16_to_int32(*past_gain_code, gcode_inov); return; } /* * Compute gcode0 * = Sum(i=0,1) pred[i]*past_qua_en[i] + mean_ener - ener_code */ L_tmp = L_deposit_h(MEAN_ENER); /* MEAN_ENER in Q16 */ L_tmp = shl_int32(L_tmp, 8); /* From Q16 to Q24 */ L_tmp = mac_16by16_to_int32(L_tmp, pred[0], past_qua_en[0]); /* Q13*Q10 -> Q24 */ L_tmp = mac_16by16_to_int32(L_tmp, pred[1], past_qua_en[1]); /* Q13*Q10 -> Q24 */ L_tmp = mac_16by16_to_int32(L_tmp, pred[2], past_qua_en[2]); /* Q13*Q10 -> Q24 */ L_tmp = mac_16by16_to_int32(L_tmp, pred[3], past_qua_en[3]); /* Q13*Q10 -> Q24 */ gcode0 = extract_h(L_tmp); /* From Q24 to Q8 */ /* * gcode0 = pow(10.0, gcode0/20) * = pow(2, 3.321928*gcode0/20) * = pow(2, 0.166096*gcode0) */ L_tmp = ((int32)gcode0 * 5443) >> 7; /* *0.166096 in Q15 -> Q24 */
void agc2_amr_wb( int16 * sig_in, /* (i) : postfilter input signal */ int16 * sig_out, /* (i/o) : postfilter output signal */ int16 l_trm /* (i) : subframe size */ ) { int16 i, exp; int16 gain_in, gain_out, g0; int32 s; int16 temp; /* calculate gain_out with exponent */ temp = sig_out[0] >> 2; s = fxp_mul_16by16(temp, temp) << 1; for (i = 1; i < l_trm; i++) { temp = sig_out[i] >> 2; s = mac_16by16_to_int32(s, temp, temp); } if (s == 0) { return; } exp = normalize_amr_wb(s) - 1; gain_out = amr_wb_round(s << exp); /* calculate gain_in with exponent */ temp = sig_in[0] >> 2; s = mul_16by16_to_int32(temp, temp); for (i = 1; i < l_trm; i++) { temp = sig_in[i] >> 2; s = mac_16by16_to_int32(s, temp, temp); } if (s == 0) { g0 = 0; } else { i = normalize_amr_wb(s); gain_in = amr_wb_round(s << i); exp -= i; /* * g0 = sqrt(gain_in/gain_out) */ s = div_16by16(gain_out, gain_in); s = shl_int32(s, 7); /* s = gain_out / gain_in */ s = shr_int32(s, exp); /* add exponent */ s = one_ov_sqrt(s); g0 = amr_wb_round(shl_int32(s, 9)); } /* sig_out(n) = gain(n) sig_out(n) */ for (i = 0; i < l_trm; i++) { sig_out[i] = extract_h(shl_int32(fxp_mul_16by16(sig_out[i], g0), 3)); } return; }