218 lines
8.2 KiB
C
218 lines
8.2 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* decode.c
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*
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* This C file contains the internal decoding function.
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*
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*/
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#include <string.h>
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#include "bandwidth_estimator.h"
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#include "codec.h"
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#include "entropy_coding.h"
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#include "pitch_estimator.h"
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#include "settings.h"
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#include "structs.h"
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WebRtc_Word16 WebRtcIsacfix_DecodeImpl(WebRtc_Word16 *signal_out16,
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ISACFIX_DecInst_t *ISACdec_obj,
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WebRtc_Word16 *current_framesamples)
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{
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int k;
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int err;
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WebRtc_Word16 BWno;
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WebRtc_Word16 len = 0;
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WebRtc_Word16 model;
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WebRtc_Word16 Vector_Word16_1[FRAMESAMPLES/2];
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WebRtc_Word16 Vector_Word16_2[FRAMESAMPLES/2];
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WebRtc_Word32 Vector_Word32_1[FRAMESAMPLES/2];
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WebRtc_Word32 Vector_Word32_2[FRAMESAMPLES/2];
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WebRtc_Word16 lofilt_coefQ15[ORDERLO*SUBFRAMES]; //refl. coeffs
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WebRtc_Word16 hifilt_coefQ15[ORDERHI*SUBFRAMES]; //refl. coeffs
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WebRtc_Word32 gain_lo_hiQ17[2*SUBFRAMES];
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WebRtc_Word16 PitchLags_Q7[PITCH_SUBFRAMES];
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WebRtc_Word16 PitchGains_Q12[PITCH_SUBFRAMES];
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WebRtc_Word16 AvgPitchGain_Q12;
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WebRtc_Word16 tmp_1, tmp_2;
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WebRtc_Word32 tmp32a, tmp32b;
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WebRtc_Word16 gainQ13;
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WebRtc_Word16 frame_nb; /* counter */
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WebRtc_Word16 frame_mode; /* 0 for 20ms and 30ms, 1 for 60ms */
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WebRtc_Word16 processed_samples;
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/* PLC */
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WebRtc_Word16 overlapWin[ 240 ];
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(ISACdec_obj->bitstr_obj).W_upper = 0xFFFFFFFF;
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(ISACdec_obj->bitstr_obj).streamval = 0;
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(ISACdec_obj->bitstr_obj).stream_index = 0;
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(ISACdec_obj->bitstr_obj).full = 1;
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/* decode framelength and BW estimation - not used, only for stream pointer*/
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err = WebRtcIsacfix_DecodeFrameLen(&ISACdec_obj->bitstr_obj, current_framesamples);
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if (err<0) // error check
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return err;
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frame_mode = (WebRtc_Word16)WEBRTC_SPL_DIV(*current_framesamples, MAX_FRAMESAMPLES); /* 0, or 1 */
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processed_samples = (WebRtc_Word16)WEBRTC_SPL_DIV(*current_framesamples, frame_mode+1); /* either 320 (20ms) or 480 (30, 60 ms) */
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err = WebRtcIsacfix_DecodeSendBandwidth(&ISACdec_obj->bitstr_obj, &BWno);
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if (err<0) // error check
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return err;
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/* one loop if it's one frame (20 or 30ms), 2 loops if 2 frames bundled together (60ms) */
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for (frame_nb = 0; frame_nb <= frame_mode; frame_nb++) {
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/* decode & dequantize pitch parameters */
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err = WebRtcIsacfix_DecodePitchGain(&(ISACdec_obj->bitstr_obj), PitchGains_Q12);
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if (err<0) // error check
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return err;
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err = WebRtcIsacfix_DecodePitchLag(&ISACdec_obj->bitstr_obj, PitchGains_Q12, PitchLags_Q7);
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if (err<0) // error check
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return err;
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AvgPitchGain_Q12 = (WebRtc_Word16)(((WebRtc_Word32)PitchGains_Q12[0] + PitchGains_Q12[1] + PitchGains_Q12[2] + PitchGains_Q12[3])>>2);
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/* decode & dequantize FiltCoef */
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err = WebRtcIsacfix_DecodeLpc(gain_lo_hiQ17, lofilt_coefQ15, hifilt_coefQ15,
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&ISACdec_obj->bitstr_obj, &model);
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if (err<0) // error check
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return err;
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/* decode & dequantize spectrum */
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len = WebRtcIsacfix_DecodeSpec(&ISACdec_obj->bitstr_obj, Vector_Word16_1, Vector_Word16_2, AvgPitchGain_Q12);
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if (len < 0) // error check
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return len;
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// Why does this need Q16 in and out? /JS
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WebRtcIsacfix_Spec2Time(Vector_Word16_1, Vector_Word16_2, Vector_Word32_1, Vector_Word32_2);
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for (k=0; k<FRAMESAMPLES/2; k++) {
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Vector_Word16_1[k] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(Vector_Word32_1[k]+64, 7); //Q16 -> Q9
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}
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/* ---- If this is recovery frame ---- */
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if( (ISACdec_obj->plcstr_obj).used == PLC_WAS_USED )
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{
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(ISACdec_obj->plcstr_obj).used = PLC_NOT_USED;
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if( (ISACdec_obj->plcstr_obj).B < 1000 )
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{
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(ISACdec_obj->plcstr_obj).decayCoeffPriodic = 4000;
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}
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ISACdec_obj->plcstr_obj.decayCoeffPriodic = WEBRTC_SPL_WORD16_MAX; /* DECAY_RATE is in Q15 */
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ISACdec_obj->plcstr_obj.decayCoeffNoise = WEBRTC_SPL_WORD16_MAX; /* DECAY_RATE is in Q15 */
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ISACdec_obj->plcstr_obj.pitchCycles = 0;
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PitchGains_Q12[0] = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(PitchGains_Q12[0], 700, 10 );
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/* ---- Add-overlap ---- */
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WebRtcSpl_GetHanningWindow( overlapWin, RECOVERY_OVERLAP );
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for( k = 0; k < RECOVERY_OVERLAP; k++ )
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Vector_Word16_1[k] = WEBRTC_SPL_ADD_SAT_W16(
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(WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT( (ISACdec_obj->plcstr_obj).overlapLP[k], overlapWin[RECOVERY_OVERLAP - k - 1], 14),
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(WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT( Vector_Word16_1[k], overlapWin[k], 14) );
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}
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/* --- Store side info --- */
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if( frame_nb == frame_mode )
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{
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/* --- LPC info */
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WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).lofilt_coefQ15, &lofilt_coefQ15[(SUBFRAMES-1)*ORDERLO], ORDERLO );
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WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).hifilt_coefQ15, &hifilt_coefQ15[(SUBFRAMES-1)*ORDERHI], ORDERHI );
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(ISACdec_obj->plcstr_obj).gain_lo_hiQ17[0] = gain_lo_hiQ17[(SUBFRAMES-1) * 2];
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(ISACdec_obj->plcstr_obj).gain_lo_hiQ17[1] = gain_lo_hiQ17[(SUBFRAMES-1) * 2 + 1];
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/* --- LTP info */
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(ISACdec_obj->plcstr_obj).AvgPitchGain_Q12 = PitchGains_Q12[3];
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(ISACdec_obj->plcstr_obj).lastPitchGain_Q12 = PitchGains_Q12[3];
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(ISACdec_obj->plcstr_obj).lastPitchLag_Q7 = PitchLags_Q7[3];
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if( PitchLags_Q7[3] < 3000 )
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(ISACdec_obj->plcstr_obj).lastPitchLag_Q7 += PitchLags_Q7[3];
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WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).prevPitchInvIn, Vector_Word16_1, FRAMESAMPLES/2 );
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}
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/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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/* inverse pitch filter */
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WebRtcIsacfix_PitchFilter(Vector_Word16_1, Vector_Word16_2, &ISACdec_obj->pitchfiltstr_obj, PitchLags_Q7, PitchGains_Q12, 4);
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if( frame_nb == frame_mode )
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{
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WEBRTC_SPL_MEMCPY_W16( (ISACdec_obj->plcstr_obj).prevPitchInvOut, &(Vector_Word16_2[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10)]), PITCH_MAX_LAG );
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}
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/* reduce gain to compensate for pitch enhancer */
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/* gain = 1.0f - 0.45f * AvgPitchGain; */
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tmp32a = WEBRTC_SPL_MUL_16_16_RSFT(AvgPitchGain_Q12, 29, 0); // Q18
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tmp32b = 262144 - tmp32a; // Q18
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gainQ13 = (WebRtc_Word16) WEBRTC_SPL_RSHIFT_W32(tmp32b, 5); // Q13
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for (k = 0; k < FRAMESAMPLES/2; k++)
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{
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Vector_Word32_1[k] = (WebRtc_Word32) WEBRTC_SPL_LSHIFT_W32(WEBRTC_SPL_MUL_16_16(Vector_Word16_2[k], gainQ13), 3); // Q25
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}
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/* perceptual post-filtering (using normalized lattice filter) */
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WebRtcIsacfix_NormLatticeFilterAr(ORDERLO, (ISACdec_obj->maskfiltstr_obj).PostStateLoGQ0,
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Vector_Word32_1, lofilt_coefQ15, gain_lo_hiQ17, 0, Vector_Word16_1);
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/* --- Store Highpass Residual --- */
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for (k = 0; k < FRAMESAMPLES/2; k++)
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Vector_Word32_1[k] = WEBRTC_SPL_LSHIFT_W32(Vector_Word32_2[k], 9); // Q16 -> Q25
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for( k = 0; k < PITCH_MAX_LAG + 10; k++ )
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(ISACdec_obj->plcstr_obj).prevHP[k] = Vector_Word32_1[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10) + k];
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WebRtcIsacfix_NormLatticeFilterAr(ORDERHI, (ISACdec_obj->maskfiltstr_obj).PostStateHiGQ0,
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Vector_Word32_1, hifilt_coefQ15, gain_lo_hiQ17, 1, Vector_Word16_2);
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/* recombine the 2 bands */
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/* Form the polyphase signals, and compensate for DC offset */
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for (k=0;k<FRAMESAMPLES/2;k++) {
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tmp_1 = (WebRtc_Word16) WEBRTC_SPL_SAT(32767, (((WebRtc_Word32)Vector_Word16_1[k]+Vector_Word16_2[k] + 1)), -32768); /* Construct a new upper channel signal*/
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tmp_2 = (WebRtc_Word16) WEBRTC_SPL_SAT(32767, (((WebRtc_Word32)Vector_Word16_1[k]-Vector_Word16_2[k])), -32768); /* Construct a new lower channel signal*/
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Vector_Word16_1[k] = tmp_1;
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Vector_Word16_2[k] = tmp_2;
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}
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WebRtcIsacfix_FilterAndCombine1(Vector_Word16_1, Vector_Word16_2, signal_out16 + frame_nb * processed_samples, &ISACdec_obj->postfiltbankstr_obj);
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}
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return len;
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}
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