/* * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ /* * decode.c * * This C file contains the internal decoding function. * */ #include #include "modules/audio_coding/codecs/isac/fix/source/bandwidth_estimator.h" #include "modules/audio_coding/codecs/isac/fix/source/codec.h" #include "modules/audio_coding/codecs/isac/fix/source/entropy_coding.h" #include "modules/audio_coding/codecs/isac/fix/source/pitch_estimator.h" #include "modules/audio_coding/codecs/isac/fix/source/settings.h" #include "modules/audio_coding/codecs/isac/fix/source/structs.h" int WebRtcIsacfix_DecodeImpl(int16_t* signal_out16, IsacFixDecoderInstance* ISACdec_obj, size_t* current_framesamples) { int k; int err; int16_t BWno; int len = 0; int16_t model; int16_t Vector_Word16_1[FRAMESAMPLES/2]; int16_t Vector_Word16_2[FRAMESAMPLES/2]; int32_t Vector_Word32_1[FRAMESAMPLES/2]; int32_t Vector_Word32_2[FRAMESAMPLES/2]; int16_t lofilt_coefQ15[ORDERLO*SUBFRAMES]; //refl. coeffs int16_t hifilt_coefQ15[ORDERHI*SUBFRAMES]; //refl. coeffs int32_t gain_lo_hiQ17[2*SUBFRAMES]; int16_t PitchLags_Q7[PITCH_SUBFRAMES]; int16_t PitchGains_Q12[PITCH_SUBFRAMES]; int16_t AvgPitchGain_Q12; int16_t tmp_1, tmp_2; int32_t tmp32a; int16_t gainQ13; size_t frame_nb; /* counter */ size_t frame_mode; /* 0 for 30ms, 1 for 60ms */ static const size_t kProcessedSamples = 480; /* 480 (for both 30, 60 ms) */ /* PLC */ int16_t overlapWin[ 240 ]; (ISACdec_obj->bitstr_obj).W_upper = 0xFFFFFFFF; (ISACdec_obj->bitstr_obj).streamval = 0; (ISACdec_obj->bitstr_obj).stream_index = 0; (ISACdec_obj->bitstr_obj).full = 1; /* decode framelength and BW estimation - not used, only for stream pointer*/ err = WebRtcIsacfix_DecodeFrameLen(&ISACdec_obj->bitstr_obj, current_framesamples); if (err<0) // error check return err; frame_mode = *current_framesamples / MAX_FRAMESAMPLES; /* 0, or 1 */ err = WebRtcIsacfix_DecodeSendBandwidth(&ISACdec_obj->bitstr_obj, &BWno); if (err<0) // error check return err; /* one loop if it's one frame (30ms), two loops if two frames bundled together * (60ms) */ for (frame_nb = 0; frame_nb <= frame_mode; frame_nb++) { /* decode & dequantize pitch parameters */ err = WebRtcIsacfix_DecodePitchGain(&(ISACdec_obj->bitstr_obj), PitchGains_Q12); if (err<0) // error check return err; err = WebRtcIsacfix_DecodePitchLag(&ISACdec_obj->bitstr_obj, PitchGains_Q12, PitchLags_Q7); if (err<0) // error check return err; AvgPitchGain_Q12 = (int16_t)(((int32_t)PitchGains_Q12[0] + PitchGains_Q12[1] + PitchGains_Q12[2] + PitchGains_Q12[3])>>2); /* decode & dequantize FiltCoef */ err = WebRtcIsacfix_DecodeLpc(gain_lo_hiQ17, lofilt_coefQ15, hifilt_coefQ15, &ISACdec_obj->bitstr_obj, &model); if (err<0) // error check return err; /* decode & dequantize spectrum */ len = WebRtcIsacfix_DecodeSpec(&ISACdec_obj->bitstr_obj, Vector_Word16_1, Vector_Word16_2, AvgPitchGain_Q12); if (len < 0) // error check return len; // Why does this need Q16 in and out? /JS WebRtcIsacfix_Spec2Time(Vector_Word16_1, Vector_Word16_2, Vector_Word32_1, Vector_Word32_2); for (k=0; k Q9. Vector_Word16_1[k] = (int16_t)((Vector_Word32_1[k] + 64) >> 7); } /* ---- If this is recovery frame ---- */ if( (ISACdec_obj->plcstr_obj).used == PLC_WAS_USED ) { (ISACdec_obj->plcstr_obj).used = PLC_NOT_USED; if( (ISACdec_obj->plcstr_obj).B < 1000 ) { (ISACdec_obj->plcstr_obj).decayCoeffPriodic = 4000; } ISACdec_obj->plcstr_obj.decayCoeffPriodic = WEBRTC_SPL_WORD16_MAX; /* DECAY_RATE is in Q15 */ ISACdec_obj->plcstr_obj.decayCoeffNoise = WEBRTC_SPL_WORD16_MAX; /* DECAY_RATE is in Q15 */ ISACdec_obj->plcstr_obj.pitchCycles = 0; PitchGains_Q12[0] = (int16_t)(PitchGains_Q12[0] * 700 >> 10); /* ---- Add-overlap ---- */ WebRtcSpl_GetHanningWindow( overlapWin, RECOVERY_OVERLAP ); for( k = 0; k < RECOVERY_OVERLAP; k++ ) Vector_Word16_1[k] = WebRtcSpl_AddSatW16( (int16_t)(ISACdec_obj->plcstr_obj.overlapLP[k] * overlapWin[RECOVERY_OVERLAP - k - 1] >> 14), (int16_t)(Vector_Word16_1[k] * overlapWin[k] >> 14)); } /* --- Store side info --- */ if( frame_nb == frame_mode ) { /* --- LPC info */ WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).lofilt_coefQ15, &lofilt_coefQ15[(SUBFRAMES-1)*ORDERLO], ORDERLO ); WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).hifilt_coefQ15, &hifilt_coefQ15[(SUBFRAMES-1)*ORDERHI], ORDERHI ); (ISACdec_obj->plcstr_obj).gain_lo_hiQ17[0] = gain_lo_hiQ17[(SUBFRAMES-1) * 2]; (ISACdec_obj->plcstr_obj).gain_lo_hiQ17[1] = gain_lo_hiQ17[(SUBFRAMES-1) * 2 + 1]; /* --- LTP info */ (ISACdec_obj->plcstr_obj).AvgPitchGain_Q12 = PitchGains_Q12[3]; (ISACdec_obj->plcstr_obj).lastPitchGain_Q12 = PitchGains_Q12[3]; (ISACdec_obj->plcstr_obj).lastPitchLag_Q7 = PitchLags_Q7[3]; if( PitchLags_Q7[3] < 3000 ) (ISACdec_obj->plcstr_obj).lastPitchLag_Q7 += PitchLags_Q7[3]; WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).prevPitchInvIn, Vector_Word16_1, FRAMESAMPLES/2 ); } /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ /* inverse pitch filter */ WebRtcIsacfix_PitchFilter(Vector_Word16_1, Vector_Word16_2, &ISACdec_obj->pitchfiltstr_obj, PitchLags_Q7, PitchGains_Q12, 4); if( frame_nb == frame_mode ) { WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).prevPitchInvOut, &(Vector_Word16_2[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10)]), PITCH_MAX_LAG ); } /* reduce gain to compensate for pitch enhancer */ /* gain = 1.0f - 0.45f * AvgPitchGain; */ tmp32a = AvgPitchGain_Q12 * 29; // Q18 gainQ13 = (int16_t)((262144 - tmp32a) >> 5); // Q18 -> Q13. for (k = 0; k < FRAMESAMPLES/2; k++) { Vector_Word32_1[k] = (Vector_Word16_2[k] * gainQ13) * (1 << 3); // Q25 } /* perceptual post-filtering (using normalized lattice filter) */ WebRtcIsacfix_NormLatticeFilterAr(ORDERLO, (ISACdec_obj->maskfiltstr_obj).PostStateLoGQ0, Vector_Word32_1, lofilt_coefQ15, gain_lo_hiQ17, 0, Vector_Word16_1); /* --- Store Highpass Residual --- */ for (k = 0; k < FRAMESAMPLES/2; k++) Vector_Word32_1[k] = Vector_Word32_2[k] * (1 << 9); // Q16 -> Q25 for( k = 0; k < PITCH_MAX_LAG + 10; k++ ) (ISACdec_obj->plcstr_obj).prevHP[k] = Vector_Word32_1[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10) + k]; WebRtcIsacfix_NormLatticeFilterAr(ORDERHI, (ISACdec_obj->maskfiltstr_obj).PostStateHiGQ0, Vector_Word32_1, hifilt_coefQ15, gain_lo_hiQ17, 1, Vector_Word16_2); /* recombine the 2 bands */ /* Form the polyphase signals, and compensate for DC offset */ for (k=0;kpostfiltbankstr_obj); } return len; }