| /* |
| * Copyright (c) 2012 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. |
| */ |
| |
| /****************************************************************** |
| |
| iLBC Speech Coder ANSI-C Source Code |
| |
| WebRtcIlbcfix_Encode.c |
| |
| ******************************************************************/ |
| |
| #include <string.h> |
| |
| // Defines WEBRTC_ARCH_BIG_ENDIAN, used below. |
| #include "rtc_base/system/arch.h" |
| |
| #include "modules/audio_coding/codecs/ilbc/defines.h" |
| #include "modules/audio_coding/codecs/ilbc/lpc_encode.h" |
| #include "modules/audio_coding/codecs/ilbc/frame_classify.h" |
| #include "modules/audio_coding/codecs/ilbc/state_search.h" |
| #include "modules/audio_coding/codecs/ilbc/state_construct.h" |
| #include "modules/audio_coding/codecs/ilbc/constants.h" |
| #include "modules/audio_coding/codecs/ilbc/cb_search.h" |
| #include "modules/audio_coding/codecs/ilbc/cb_construct.h" |
| #include "modules/audio_coding/codecs/ilbc/index_conv_enc.h" |
| #include "modules/audio_coding/codecs/ilbc/pack_bits.h" |
| #include "modules/audio_coding/codecs/ilbc/hp_input.h" |
| #include "rtc_base/checks.h" |
| |
| #ifdef SPLIT_10MS |
| #include "modules/audio_coding/codecs/ilbc/unpack_bits.h" |
| #include "modules/audio_coding/codecs/ilbc/index_conv_dec.h" |
| #endif |
| #ifndef WEBRTC_ARCH_BIG_ENDIAN |
| #include "modules/audio_coding/codecs/ilbc/swap_bytes.h" |
| #endif |
| |
| /*----------------------------------------------------------------* |
| * main encoder function |
| *---------------------------------------------------------------*/ |
| |
| void WebRtcIlbcfix_EncodeImpl( |
| uint16_t *bytes, /* (o) encoded data bits iLBC */ |
| const int16_t *block, /* (i) speech vector to encode */ |
| IlbcEncoder *iLBCenc_inst /* (i/o) the general encoder |
| state */ |
| ){ |
| size_t n, meml_gotten, Nfor; |
| size_t diff, start_pos; |
| size_t index; |
| size_t subcount, subframe; |
| size_t start_count, end_count; |
| int16_t *residual; |
| int32_t en1, en2; |
| int16_t scale, max; |
| int16_t *syntdenum; |
| int16_t *decresidual; |
| int16_t *reverseResidual; |
| int16_t *reverseDecresidual; |
| /* Stack based */ |
| int16_t weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX]; |
| int16_t dataVec[BLOCKL_MAX + LPC_FILTERORDER]; |
| int16_t memVec[CB_MEML+CB_FILTERLEN]; |
| int16_t bitsMemory[sizeof(iLBC_bits)/sizeof(int16_t)]; |
| iLBC_bits *iLBCbits_inst = (iLBC_bits*)bitsMemory; |
| |
| |
| #ifdef SPLIT_10MS |
| int16_t *weightdenumbuf = iLBCenc_inst->weightdenumbuf; |
| int16_t last_bit; |
| #endif |
| |
| int16_t *data = &dataVec[LPC_FILTERORDER]; |
| int16_t *mem = &memVec[CB_HALFFILTERLEN]; |
| |
| /* Reuse som buffers to save stack memory */ |
| residual = &iLBCenc_inst->lpc_buffer[LPC_LOOKBACK+BLOCKL_MAX-iLBCenc_inst->blockl]; |
| syntdenum = mem; /* syntdenum[(LPC_FILTERORDER + 1)*NSUB_MAX] and mem are used non overlapping in the code */ |
| decresidual = residual; /* Already encoded residual is overwritten by the decoded version */ |
| reverseResidual = data; /* data and reverseResidual are used non overlapping in the code */ |
| reverseDecresidual = reverseResidual; /* Already encoded residual is overwritten by the decoded version */ |
| |
| #ifdef SPLIT_10MS |
| |
| WebRtcSpl_MemSetW16 ( (int16_t *) iLBCbits_inst, 0, |
| sizeof(iLBC_bits) / sizeof(int16_t) ); |
| |
| start_pos = iLBCenc_inst->start_pos; |
| diff = iLBCenc_inst->diff; |
| |
| if (iLBCenc_inst->section != 0){ |
| WEBRTC_SPL_MEMCPY_W16 (weightdenum, weightdenumbuf, |
| SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM); |
| /* Un-Packetize the frame into parameters */ |
| last_bit = WebRtcIlbcfix_UnpackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode); |
| if (last_bit) |
| return; |
| /* adjust index */ |
| WebRtcIlbcfix_IndexConvDec (iLBCbits_inst->cb_index); |
| |
| if (iLBCenc_inst->section == 1){ |
| /* Save first 80 samples of a 160/240 sample frame for 20/30msec */ |
| WEBRTC_SPL_MEMCPY_W16 (iLBCenc_inst->past_samples, block, 80); |
| } |
| else{ // iLBCenc_inst->section == 2 AND mode = 30ms |
| /* Save second 80 samples of a 240 sample frame for 30msec */ |
| WEBRTC_SPL_MEMCPY_W16 (iLBCenc_inst->past_samples + 80, block, 80); |
| } |
| } |
| else{ // iLBCenc_inst->section == 0 |
| /* form a complete frame of 160/240 for 20msec/30msec mode */ |
| WEBRTC_SPL_MEMCPY_W16 (data + (iLBCenc_inst->mode * 8) - 80, block, 80); |
| WEBRTC_SPL_MEMCPY_W16 (data, iLBCenc_inst->past_samples, |
| (iLBCenc_inst->mode * 8) - 80); |
| iLBCenc_inst->Nfor_flag = 0; |
| iLBCenc_inst->Nback_flag = 0; |
| #else |
| /* copy input block to data*/ |
| WEBRTC_SPL_MEMCPY_W16(data,block,iLBCenc_inst->blockl); |
| #endif |
| |
| /* high pass filtering of input signal and scale down the residual (*0.5) */ |
| WebRtcIlbcfix_HpInput(data, (int16_t*)WebRtcIlbcfix_kHpInCoefs, |
| iLBCenc_inst->hpimemy, iLBCenc_inst->hpimemx, |
| iLBCenc_inst->blockl); |
| |
| /* LPC of hp filtered input data */ |
| WebRtcIlbcfix_LpcEncode(syntdenum, weightdenum, iLBCbits_inst->lsf, data, |
| iLBCenc_inst); |
| |
| /* Set up state */ |
| WEBRTC_SPL_MEMCPY_W16(dataVec, iLBCenc_inst->anaMem, LPC_FILTERORDER); |
| |
| /* inverse filter to get residual */ |
| for (n=0; n<iLBCenc_inst->nsub; n++ ) { |
| WebRtcSpl_FilterMAFastQ12( |
| &data[n*SUBL], &residual[n*SUBL], |
| &syntdenum[n*(LPC_FILTERORDER+1)], |
| LPC_FILTERORDER+1, SUBL); |
| } |
| |
| /* Copy the state for next frame */ |
| WEBRTC_SPL_MEMCPY_W16(iLBCenc_inst->anaMem, &data[iLBCenc_inst->blockl-LPC_FILTERORDER], LPC_FILTERORDER); |
| |
| /* find state location */ |
| |
| iLBCbits_inst->startIdx = WebRtcIlbcfix_FrameClassify(iLBCenc_inst,residual); |
| |
| /* check if state should be in first or last part of the |
| two subframes */ |
| |
| index = (iLBCbits_inst->startIdx-1)*SUBL; |
| max=WebRtcSpl_MaxAbsValueW16(&residual[index], 2*SUBL); |
| scale = WebRtcSpl_GetSizeInBits((uint32_t)(max * max)); |
| |
| /* Scale to maximum 25 bits so that the MAC won't cause overflow */ |
| scale = scale - 25; |
| if(scale < 0) { |
| scale = 0; |
| } |
| |
| diff = STATE_LEN - iLBCenc_inst->state_short_len; |
| en1=WebRtcSpl_DotProductWithScale(&residual[index], &residual[index], |
| iLBCenc_inst->state_short_len, scale); |
| index += diff; |
| en2=WebRtcSpl_DotProductWithScale(&residual[index], &residual[index], |
| iLBCenc_inst->state_short_len, scale); |
| if (en1 > en2) { |
| iLBCbits_inst->state_first = 1; |
| start_pos = (iLBCbits_inst->startIdx-1)*SUBL; |
| } else { |
| iLBCbits_inst->state_first = 0; |
| start_pos = (iLBCbits_inst->startIdx-1)*SUBL + diff; |
| } |
| |
| /* scalar quantization of state */ |
| |
| WebRtcIlbcfix_StateSearch(iLBCenc_inst, iLBCbits_inst, &residual[start_pos], |
| &syntdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)], |
| &weightdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)]); |
| |
| WebRtcIlbcfix_StateConstruct(iLBCbits_inst->idxForMax, iLBCbits_inst->idxVec, |
| &syntdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)], |
| &decresidual[start_pos], iLBCenc_inst->state_short_len |
| ); |
| |
| /* predictive quantization in state */ |
| |
| if (iLBCbits_inst->state_first) { /* put adaptive part in the end */ |
| |
| /* setup memory */ |
| |
| WebRtcSpl_MemSetW16(mem, 0, CB_MEML - iLBCenc_inst->state_short_len); |
| WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-iLBCenc_inst->state_short_len, |
| decresidual+start_pos, iLBCenc_inst->state_short_len); |
| |
| /* encode subframes */ |
| |
| WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index, iLBCbits_inst->gain_index, |
| &residual[start_pos+iLBCenc_inst->state_short_len], |
| mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL, diff, |
| &weightdenum[iLBCbits_inst->startIdx*(LPC_FILTERORDER+1)], 0); |
| |
| /* construct decoded vector */ |
| |
| RTC_CHECK(WebRtcIlbcfix_CbConstruct( |
| &decresidual[start_pos + iLBCenc_inst->state_short_len], |
| iLBCbits_inst->cb_index, iLBCbits_inst->gain_index, |
| mem + CB_MEML - ST_MEM_L_TBL, ST_MEM_L_TBL, diff)); |
| |
| } |
| else { /* put adaptive part in the beginning */ |
| |
| /* create reversed vectors for prediction */ |
| |
| WebRtcSpl_MemCpyReversedOrder(&reverseResidual[diff-1], |
| &residual[(iLBCbits_inst->startIdx+1)*SUBL-STATE_LEN], diff); |
| |
| /* setup memory */ |
| |
| meml_gotten = iLBCenc_inst->state_short_len; |
| WebRtcSpl_MemCpyReversedOrder(&mem[CB_MEML-1], &decresidual[start_pos], meml_gotten); |
| WebRtcSpl_MemSetW16(mem, 0, CB_MEML - iLBCenc_inst->state_short_len); |
| |
| /* encode subframes */ |
| WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index, iLBCbits_inst->gain_index, |
| reverseResidual, mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL, diff, |
| &weightdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)], |
| 0); |
| |
| /* construct decoded vector */ |
| RTC_CHECK(WebRtcIlbcfix_CbConstruct( |
| reverseDecresidual, iLBCbits_inst->cb_index, |
| iLBCbits_inst->gain_index, mem + CB_MEML - ST_MEM_L_TBL, |
| ST_MEM_L_TBL, diff)); |
| |
| /* get decoded residual from reversed vector */ |
| |
| WebRtcSpl_MemCpyReversedOrder(&decresidual[start_pos-1], reverseDecresidual, diff); |
| } |
| |
| #ifdef SPLIT_10MS |
| iLBCenc_inst->start_pos = start_pos; |
| iLBCenc_inst->diff = diff; |
| iLBCenc_inst->section++; |
| /* adjust index */ |
| WebRtcIlbcfix_IndexConvEnc (iLBCbits_inst->cb_index); |
| /* Packetize the parameters into the frame */ |
| WebRtcIlbcfix_PackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode); |
| WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum, |
| SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM); |
| return; |
| } |
| #endif |
| |
| /* forward prediction of subframes */ |
| |
| Nfor = iLBCenc_inst->nsub-iLBCbits_inst->startIdx-1; |
| |
| /* counter for predicted subframes */ |
| #ifdef SPLIT_10MS |
| if (iLBCenc_inst->mode == 20) |
| { |
| subcount = 1; |
| } |
| if (iLBCenc_inst->mode == 30) |
| { |
| if (iLBCenc_inst->section == 1) |
| { |
| subcount = 1; |
| } |
| if (iLBCenc_inst->section == 2) |
| { |
| subcount = 3; |
| } |
| } |
| #else |
| subcount=1; |
| #endif |
| |
| if( Nfor > 0 ){ |
| |
| /* setup memory */ |
| |
| WebRtcSpl_MemSetW16(mem, 0, CB_MEML-STATE_LEN); |
| WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-STATE_LEN, |
| decresidual+(iLBCbits_inst->startIdx-1)*SUBL, STATE_LEN); |
| |
| #ifdef SPLIT_10MS |
| if (iLBCenc_inst->Nfor_flag > 0) |
| { |
| for (subframe = 0; subframe < WEBRTC_SPL_MIN (Nfor, 2); subframe++) |
| { |
| /* update memory */ |
| WEBRTC_SPL_MEMCPY_W16 (mem, mem + SUBL, (CB_MEML - SUBL)); |
| WEBRTC_SPL_MEMCPY_W16 (mem + CB_MEML - SUBL, |
| &decresidual[(iLBCbits_inst->startIdx + 1 + |
| subframe) * SUBL], SUBL); |
| } |
| } |
| |
| iLBCenc_inst->Nfor_flag++; |
| |
| if (iLBCenc_inst->mode == 20) |
| { |
| start_count = 0; |
| end_count = Nfor; |
| } |
| if (iLBCenc_inst->mode == 30) |
| { |
| if (iLBCenc_inst->section == 1) |
| { |
| start_count = 0; |
| end_count = WEBRTC_SPL_MIN (Nfor, (size_t)2); |
| } |
| if (iLBCenc_inst->section == 2) |
| { |
| start_count = WEBRTC_SPL_MIN (Nfor, (size_t)2); |
| end_count = Nfor; |
| } |
| } |
| #else |
| start_count = 0; |
| end_count = Nfor; |
| #endif |
| |
| /* loop over subframes to encode */ |
| |
| for (subframe = start_count; subframe < end_count; subframe++){ |
| |
| /* encode subframe */ |
| |
| WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index+subcount*CB_NSTAGES, |
| iLBCbits_inst->gain_index+subcount*CB_NSTAGES, |
| &residual[(iLBCbits_inst->startIdx+1+subframe)*SUBL], |
| mem, MEM_LF_TBL, SUBL, |
| &weightdenum[(iLBCbits_inst->startIdx+1+subframe)*(LPC_FILTERORDER+1)], |
| subcount); |
| |
| /* construct decoded vector */ |
| RTC_CHECK(WebRtcIlbcfix_CbConstruct( |
| &decresidual[(iLBCbits_inst->startIdx + 1 + subframe) * SUBL], |
| iLBCbits_inst->cb_index + subcount * CB_NSTAGES, |
| iLBCbits_inst->gain_index + subcount * CB_NSTAGES, mem, MEM_LF_TBL, |
| SUBL)); |
| |
| /* update memory */ |
| |
| memmove(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(*mem)); |
| WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-SUBL, |
| &decresidual[(iLBCbits_inst->startIdx+1+subframe)*SUBL], SUBL); |
| |
| subcount++; |
| } |
| } |
| |
| #ifdef SPLIT_10MS |
| if ((iLBCenc_inst->section == 1) && |
| (iLBCenc_inst->mode == 30) && (Nfor > 0) && (end_count == 2)) |
| { |
| iLBCenc_inst->section++; |
| /* adjust index */ |
| WebRtcIlbcfix_IndexConvEnc (iLBCbits_inst->cb_index); |
| /* Packetize the parameters into the frame */ |
| WebRtcIlbcfix_PackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode); |
| WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum, |
| SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM); |
| return; |
| } |
| #endif |
| |
| /* backward prediction of subframes */ |
| |
| if (iLBCbits_inst->startIdx > 1) { |
| |
| /* create reverse order vectors |
| (The decresidual does not need to be copied since it is |
| contained in the same vector as the residual) |
| */ |
| |
| size_t Nback = iLBCbits_inst->startIdx - 1; |
| WebRtcSpl_MemCpyReversedOrder(&reverseResidual[Nback*SUBL-1], residual, Nback*SUBL); |
| |
| /* setup memory */ |
| |
| meml_gotten = SUBL*(iLBCenc_inst->nsub+1-iLBCbits_inst->startIdx); |
| if( meml_gotten > CB_MEML ) { |
| meml_gotten=CB_MEML; |
| } |
| |
| WebRtcSpl_MemCpyReversedOrder(&mem[CB_MEML-1], &decresidual[Nback*SUBL], meml_gotten); |
| WebRtcSpl_MemSetW16(mem, 0, CB_MEML - meml_gotten); |
| |
| #ifdef SPLIT_10MS |
| if (iLBCenc_inst->Nback_flag > 0) |
| { |
| for (subframe = 0; subframe < WEBRTC_SPL_MAX (2 - Nfor, 0); subframe++) |
| { |
| /* update memory */ |
| WEBRTC_SPL_MEMCPY_W16 (mem, mem + SUBL, (CB_MEML - SUBL)); |
| WEBRTC_SPL_MEMCPY_W16 (mem + CB_MEML - SUBL, |
| &reverseDecresidual[subframe * SUBL], SUBL); |
| } |
| } |
| |
| iLBCenc_inst->Nback_flag++; |
| |
| |
| if (iLBCenc_inst->mode == 20) |
| { |
| start_count = 0; |
| end_count = Nback; |
| } |
| if (iLBCenc_inst->mode == 30) |
| { |
| if (iLBCenc_inst->section == 1) |
| { |
| start_count = 0; |
| end_count = (Nfor >= 2) ? 0 : (2 - NFor); |
| } |
| if (iLBCenc_inst->section == 2) |
| { |
| start_count = (Nfor >= 2) ? 0 : (2 - NFor); |
| end_count = Nback; |
| } |
| } |
| #else |
| start_count = 0; |
| end_count = Nback; |
| #endif |
| |
| /* loop over subframes to encode */ |
| |
| for (subframe = start_count; subframe < end_count; subframe++){ |
| |
| /* encode subframe */ |
| |
| WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index+subcount*CB_NSTAGES, |
| iLBCbits_inst->gain_index+subcount*CB_NSTAGES, &reverseResidual[subframe*SUBL], |
| mem, MEM_LF_TBL, SUBL, |
| &weightdenum[(iLBCbits_inst->startIdx-2-subframe)*(LPC_FILTERORDER+1)], |
| subcount); |
| |
| /* construct decoded vector */ |
| RTC_CHECK(WebRtcIlbcfix_CbConstruct( |
| &reverseDecresidual[subframe * SUBL], |
| iLBCbits_inst->cb_index + subcount * CB_NSTAGES, |
| iLBCbits_inst->gain_index + subcount * CB_NSTAGES, mem, MEM_LF_TBL, |
| SUBL)); |
| |
| /* update memory */ |
| memmove(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(*mem)); |
| WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-SUBL, |
| &reverseDecresidual[subframe*SUBL], SUBL); |
| |
| subcount++; |
| |
| } |
| |
| /* get decoded residual from reversed vector */ |
| |
| WebRtcSpl_MemCpyReversedOrder(&decresidual[SUBL*Nback-1], reverseDecresidual, SUBL*Nback); |
| } |
| /* end encoding part */ |
| |
| /* adjust index */ |
| |
| WebRtcIlbcfix_IndexConvEnc(iLBCbits_inst->cb_index); |
| |
| /* Packetize the parameters into the frame */ |
| |
| #ifdef SPLIT_10MS |
| if( (iLBCenc_inst->mode==30) && (iLBCenc_inst->section==1) ){ |
| WebRtcIlbcfix_PackBits(iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode); |
| } |
| else{ |
| WebRtcIlbcfix_PackBits(bytes, iLBCbits_inst, iLBCenc_inst->mode); |
| } |
| #else |
| WebRtcIlbcfix_PackBits(bytes, iLBCbits_inst, iLBCenc_inst->mode); |
| #endif |
| |
| #ifndef WEBRTC_ARCH_BIG_ENDIAN |
| /* Swap bytes for LITTLE ENDIAN since the packbits() |
| function assumes BIG_ENDIAN machine */ |
| #ifdef SPLIT_10MS |
| if (( (iLBCenc_inst->section == 1) && (iLBCenc_inst->mode == 20) ) || |
| ( (iLBCenc_inst->section == 2) && (iLBCenc_inst->mode == 30) )){ |
| WebRtcIlbcfix_SwapBytes(bytes, iLBCenc_inst->no_of_words, bytes); |
| } |
| #else |
| WebRtcIlbcfix_SwapBytes(bytes, iLBCenc_inst->no_of_words, bytes); |
| #endif |
| #endif |
| |
| #ifdef SPLIT_10MS |
| if (subcount == (iLBCenc_inst->nsub - 1)) |
| { |
| iLBCenc_inst->section = 0; |
| } |
| else |
| { |
| iLBCenc_inst->section++; |
| WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum, |
| SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM); |
| } |
| #endif |
| |
| } |
