600 lines
18 KiB
C++
600 lines
18 KiB
C++
/*
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* Copyright (c) 2012 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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#include "modules/audio_processing/aecm/echo_control_mobile.h"
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#ifdef AEC_DEBUG
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#include <stdio.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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extern "C" {
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#include "common_audio/ring_buffer.h"
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "modules/audio_processing/aecm/aecm_defines.h"
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}
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#include "modules/audio_processing/aecm/aecm_core.h"
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namespace webrtc {
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namespace {
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#define BUF_SIZE_FRAMES 50 // buffer size (frames)
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// Maximum length of resampled signal. Must be an integer multiple of frames
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// (ceil(1/(1 + MIN_SKEW)*2) + 1)*FRAME_LEN
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// The factor of 2 handles wb, and the + 1 is as a safety margin
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#define MAX_RESAMP_LEN (5 * FRAME_LEN)
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static const size_t kBufSizeSamp =
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BUF_SIZE_FRAMES * FRAME_LEN; // buffer size (samples)
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static const int kSampMsNb = 8; // samples per ms in nb
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// Target suppression levels for nlp modes
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// log{0.001, 0.00001, 0.00000001}
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static const int kInitCheck = 42;
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typedef struct {
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int sampFreq;
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int scSampFreq;
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short bufSizeStart;
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int knownDelay;
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// Stores the last frame added to the farend buffer
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short farendOld[2][FRAME_LEN];
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short initFlag; // indicates if AEC has been initialized
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// Variables used for averaging far end buffer size
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short counter;
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short sum;
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short firstVal;
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short checkBufSizeCtr;
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// Variables used for delay shifts
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short msInSndCardBuf;
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short filtDelay;
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int timeForDelayChange;
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int ECstartup;
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int checkBuffSize;
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int delayChange;
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short lastDelayDiff;
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int16_t echoMode;
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#ifdef AEC_DEBUG
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FILE* bufFile;
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FILE* delayFile;
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FILE* preCompFile;
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FILE* postCompFile;
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#endif // AEC_DEBUG
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// Structures
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RingBuffer* farendBuf;
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AecmCore* aecmCore;
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} AecMobile;
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} // namespace
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// Estimates delay to set the position of the farend buffer read pointer
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// (controlled by knownDelay)
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static int WebRtcAecm_EstBufDelay(AecMobile* aecm, short msInSndCardBuf);
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// Stuffs the farend buffer if the estimated delay is too large
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static int WebRtcAecm_DelayComp(AecMobile* aecm);
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void* WebRtcAecm_Create() {
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// Allocate zero-filled memory.
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AecMobile* aecm = static_cast<AecMobile*>(calloc(1, sizeof(AecMobile)));
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aecm->aecmCore = WebRtcAecm_CreateCore();
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if (!aecm->aecmCore) {
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WebRtcAecm_Free(aecm);
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return NULL;
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}
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aecm->farendBuf = WebRtc_CreateBuffer(kBufSizeSamp, sizeof(int16_t));
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if (!aecm->farendBuf) {
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WebRtcAecm_Free(aecm);
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return NULL;
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}
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#ifdef AEC_DEBUG
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aecm->aecmCore->farFile = fopen("aecFar.pcm", "wb");
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aecm->aecmCore->nearFile = fopen("aecNear.pcm", "wb");
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aecm->aecmCore->outFile = fopen("aecOut.pcm", "wb");
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// aecm->aecmCore->outLpFile = fopen("aecOutLp.pcm","wb");
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aecm->bufFile = fopen("aecBuf.dat", "wb");
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aecm->delayFile = fopen("aecDelay.dat", "wb");
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aecm->preCompFile = fopen("preComp.pcm", "wb");
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aecm->postCompFile = fopen("postComp.pcm", "wb");
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#endif // AEC_DEBUG
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return aecm;
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}
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void WebRtcAecm_Free(void* aecmInst) {
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AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
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if (aecm == NULL) {
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return;
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}
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#ifdef AEC_DEBUG
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fclose(aecm->aecmCore->farFile);
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fclose(aecm->aecmCore->nearFile);
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fclose(aecm->aecmCore->outFile);
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// fclose(aecm->aecmCore->outLpFile);
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fclose(aecm->bufFile);
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fclose(aecm->delayFile);
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fclose(aecm->preCompFile);
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fclose(aecm->postCompFile);
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#endif // AEC_DEBUG
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WebRtcAecm_FreeCore(aecm->aecmCore);
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WebRtc_FreeBuffer(aecm->farendBuf);
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free(aecm);
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}
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int32_t WebRtcAecm_Init(void* aecmInst, int32_t sampFreq) {
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AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
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AecmConfig aecConfig;
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if (aecm == NULL) {
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return -1;
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}
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if (sampFreq != 8000 && sampFreq != 16000) {
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return AECM_BAD_PARAMETER_ERROR;
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}
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aecm->sampFreq = sampFreq;
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// Initialize AECM core
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if (WebRtcAecm_InitCore(aecm->aecmCore, aecm->sampFreq) == -1) {
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return AECM_UNSPECIFIED_ERROR;
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}
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// Initialize farend buffer
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WebRtc_InitBuffer(aecm->farendBuf);
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aecm->initFlag = kInitCheck; // indicates that initialization has been done
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aecm->delayChange = 1;
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aecm->sum = 0;
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aecm->counter = 0;
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aecm->checkBuffSize = 1;
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aecm->firstVal = 0;
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aecm->ECstartup = 1;
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aecm->bufSizeStart = 0;
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aecm->checkBufSizeCtr = 0;
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aecm->filtDelay = 0;
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aecm->timeForDelayChange = 0;
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aecm->knownDelay = 0;
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aecm->lastDelayDiff = 0;
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memset(&aecm->farendOld, 0, sizeof(aecm->farendOld));
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// Default settings.
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aecConfig.cngMode = AecmTrue;
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aecConfig.echoMode = 3;
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if (WebRtcAecm_set_config(aecm, aecConfig) == -1) {
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return AECM_UNSPECIFIED_ERROR;
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}
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return 0;
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}
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// Returns any error that is caused when buffering the
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// farend signal.
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int32_t WebRtcAecm_GetBufferFarendError(void* aecmInst,
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const int16_t* farend,
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size_t nrOfSamples) {
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AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
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if (aecm == NULL)
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return -1;
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if (farend == NULL)
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return AECM_NULL_POINTER_ERROR;
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if (aecm->initFlag != kInitCheck)
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return AECM_UNINITIALIZED_ERROR;
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if (nrOfSamples != 80 && nrOfSamples != 160)
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return AECM_BAD_PARAMETER_ERROR;
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return 0;
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}
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int32_t WebRtcAecm_BufferFarend(void* aecmInst,
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const int16_t* farend,
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size_t nrOfSamples) {
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AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
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const int32_t err =
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WebRtcAecm_GetBufferFarendError(aecmInst, farend, nrOfSamples);
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if (err != 0)
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return err;
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// TODO(unknown): Is this really a good idea?
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if (!aecm->ECstartup) {
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WebRtcAecm_DelayComp(aecm);
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}
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WebRtc_WriteBuffer(aecm->farendBuf, farend, nrOfSamples);
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return 0;
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}
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int32_t WebRtcAecm_Process(void* aecmInst,
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const int16_t* nearendNoisy,
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const int16_t* nearendClean,
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int16_t* out,
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size_t nrOfSamples,
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int16_t msInSndCardBuf) {
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AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
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int32_t retVal = 0;
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size_t i;
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short nmbrOfFilledBuffers;
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size_t nBlocks10ms;
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size_t nFrames;
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#ifdef AEC_DEBUG
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short msInAECBuf;
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#endif
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if (aecm == NULL) {
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return -1;
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}
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if (nearendNoisy == NULL) {
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return AECM_NULL_POINTER_ERROR;
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}
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if (out == NULL) {
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return AECM_NULL_POINTER_ERROR;
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}
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if (aecm->initFlag != kInitCheck) {
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return AECM_UNINITIALIZED_ERROR;
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}
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if (nrOfSamples != 80 && nrOfSamples != 160) {
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return AECM_BAD_PARAMETER_ERROR;
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}
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if (msInSndCardBuf < 0) {
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msInSndCardBuf = 0;
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retVal = AECM_BAD_PARAMETER_WARNING;
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} else if (msInSndCardBuf > 500) {
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msInSndCardBuf = 500;
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retVal = AECM_BAD_PARAMETER_WARNING;
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}
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msInSndCardBuf += 10;
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aecm->msInSndCardBuf = msInSndCardBuf;
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nFrames = nrOfSamples / FRAME_LEN;
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nBlocks10ms = nFrames / aecm->aecmCore->mult;
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if (aecm->ECstartup) {
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if (nearendClean == NULL) {
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if (out != nearendNoisy) {
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memcpy(out, nearendNoisy, sizeof(short) * nrOfSamples);
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}
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} else if (out != nearendClean) {
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memcpy(out, nearendClean, sizeof(short) * nrOfSamples);
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}
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nmbrOfFilledBuffers =
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(short)WebRtc_available_read(aecm->farendBuf) / FRAME_LEN;
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// The AECM is in the start up mode
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// AECM is disabled until the soundcard buffer and farend buffers are OK
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// Mechanism to ensure that the soundcard buffer is reasonably stable.
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if (aecm->checkBuffSize) {
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aecm->checkBufSizeCtr++;
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// Before we fill up the far end buffer we require the amount of data on
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// the sound card to be stable (+/-8 ms) compared to the first value. This
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// comparison is made during the following 4 consecutive frames. If it
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// seems to be stable then we start to fill up the far end buffer.
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if (aecm->counter == 0) {
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aecm->firstVal = aecm->msInSndCardBuf;
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aecm->sum = 0;
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}
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if (abs(aecm->firstVal - aecm->msInSndCardBuf) <
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WEBRTC_SPL_MAX(0.2 * aecm->msInSndCardBuf, kSampMsNb)) {
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aecm->sum += aecm->msInSndCardBuf;
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aecm->counter++;
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} else {
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aecm->counter = 0;
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}
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if (aecm->counter * nBlocks10ms >= 6) {
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// The farend buffer size is determined in blocks of 80 samples
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// Use 75% of the average value of the soundcard buffer
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aecm->bufSizeStart = WEBRTC_SPL_MIN(
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(3 * aecm->sum * aecm->aecmCore->mult) / (aecm->counter * 40),
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BUF_SIZE_FRAMES);
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// buffersize has now been determined
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aecm->checkBuffSize = 0;
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}
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if (aecm->checkBufSizeCtr * nBlocks10ms > 50) {
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// for really bad sound cards, don't disable echocanceller for more than
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// 0.5 sec
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aecm->bufSizeStart = WEBRTC_SPL_MIN(
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(3 * aecm->msInSndCardBuf * aecm->aecmCore->mult) / 40,
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BUF_SIZE_FRAMES);
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aecm->checkBuffSize = 0;
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}
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}
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// if checkBuffSize changed in the if-statement above
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if (!aecm->checkBuffSize) {
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// soundcard buffer is now reasonably stable
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// When the far end buffer is filled with approximately the same amount of
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// data as the amount on the sound card we end the start up phase and
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// start to cancel echoes.
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if (nmbrOfFilledBuffers == aecm->bufSizeStart) {
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aecm->ECstartup = 0; // Enable the AECM
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} else if (nmbrOfFilledBuffers > aecm->bufSizeStart) {
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WebRtc_MoveReadPtr(aecm->farendBuf,
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(int)WebRtc_available_read(aecm->farendBuf) -
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(int)aecm->bufSizeStart * FRAME_LEN);
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aecm->ECstartup = 0;
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}
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}
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} else {
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// AECM is enabled
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// Note only 1 block supported for nb and 2 blocks for wb
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for (i = 0; i < nFrames; i++) {
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int16_t farend[FRAME_LEN];
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const int16_t* farend_ptr = NULL;
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nmbrOfFilledBuffers =
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(short)WebRtc_available_read(aecm->farendBuf) / FRAME_LEN;
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// Check that there is data in the far end buffer
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if (nmbrOfFilledBuffers > 0) {
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// Get the next 80 samples from the farend buffer
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WebRtc_ReadBuffer(aecm->farendBuf, (void**)&farend_ptr, farend,
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FRAME_LEN);
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// Always store the last frame for use when we run out of data
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memcpy(&(aecm->farendOld[i][0]), farend_ptr, FRAME_LEN * sizeof(short));
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} else {
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// We have no data so we use the last played frame
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memcpy(farend, &(aecm->farendOld[i][0]), FRAME_LEN * sizeof(short));
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farend_ptr = farend;
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}
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// Call buffer delay estimator when all data is extracted,
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// i,e. i = 0 for NB and i = 1 for WB
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if ((i == 0 && aecm->sampFreq == 8000) ||
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(i == 1 && aecm->sampFreq == 16000)) {
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WebRtcAecm_EstBufDelay(aecm, aecm->msInSndCardBuf);
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}
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// Call the AECM
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/*WebRtcAecm_ProcessFrame(aecm->aecmCore, farend, &nearend[FRAME_LEN * i],
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&out[FRAME_LEN * i], aecm->knownDelay);*/
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if (WebRtcAecm_ProcessFrame(
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aecm->aecmCore, farend_ptr, &nearendNoisy[FRAME_LEN * i],
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(nearendClean ? &nearendClean[FRAME_LEN * i] : NULL),
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&out[FRAME_LEN * i]) == -1)
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return -1;
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}
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}
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#ifdef AEC_DEBUG
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msInAECBuf = (short)WebRtc_available_read(aecm->farendBuf) /
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(kSampMsNb * aecm->aecmCore->mult);
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fwrite(&msInAECBuf, 2, 1, aecm->bufFile);
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fwrite(&(aecm->knownDelay), sizeof(aecm->knownDelay), 1, aecm->delayFile);
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#endif
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return retVal;
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}
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int32_t WebRtcAecm_set_config(void* aecmInst, AecmConfig config) {
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AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
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if (aecm == NULL) {
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return -1;
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}
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if (aecm->initFlag != kInitCheck) {
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return AECM_UNINITIALIZED_ERROR;
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}
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if (config.cngMode != AecmFalse && config.cngMode != AecmTrue) {
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return AECM_BAD_PARAMETER_ERROR;
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}
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aecm->aecmCore->cngMode = config.cngMode;
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if (config.echoMode < 0 || config.echoMode > 4) {
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return AECM_BAD_PARAMETER_ERROR;
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}
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aecm->echoMode = config.echoMode;
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if (aecm->echoMode == 0) {
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aecm->aecmCore->supGain = SUPGAIN_DEFAULT >> 3;
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aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT >> 3;
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aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A >> 3;
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aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D >> 3;
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aecm->aecmCore->supGainErrParamDiffAB =
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(SUPGAIN_ERROR_PARAM_A >> 3) - (SUPGAIN_ERROR_PARAM_B >> 3);
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aecm->aecmCore->supGainErrParamDiffBD =
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(SUPGAIN_ERROR_PARAM_B >> 3) - (SUPGAIN_ERROR_PARAM_D >> 3);
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} else if (aecm->echoMode == 1) {
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aecm->aecmCore->supGain = SUPGAIN_DEFAULT >> 2;
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aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT >> 2;
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aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A >> 2;
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aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D >> 2;
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aecm->aecmCore->supGainErrParamDiffAB =
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(SUPGAIN_ERROR_PARAM_A >> 2) - (SUPGAIN_ERROR_PARAM_B >> 2);
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aecm->aecmCore->supGainErrParamDiffBD =
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(SUPGAIN_ERROR_PARAM_B >> 2) - (SUPGAIN_ERROR_PARAM_D >> 2);
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} else if (aecm->echoMode == 2) {
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aecm->aecmCore->supGain = SUPGAIN_DEFAULT >> 1;
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aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT >> 1;
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aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A >> 1;
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aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D >> 1;
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aecm->aecmCore->supGainErrParamDiffAB =
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(SUPGAIN_ERROR_PARAM_A >> 1) - (SUPGAIN_ERROR_PARAM_B >> 1);
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aecm->aecmCore->supGainErrParamDiffBD =
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(SUPGAIN_ERROR_PARAM_B >> 1) - (SUPGAIN_ERROR_PARAM_D >> 1);
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} else if (aecm->echoMode == 3) {
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aecm->aecmCore->supGain = SUPGAIN_DEFAULT;
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aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT;
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aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A;
|
|
aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D;
|
|
aecm->aecmCore->supGainErrParamDiffAB =
|
|
SUPGAIN_ERROR_PARAM_A - SUPGAIN_ERROR_PARAM_B;
|
|
aecm->aecmCore->supGainErrParamDiffBD =
|
|
SUPGAIN_ERROR_PARAM_B - SUPGAIN_ERROR_PARAM_D;
|
|
} else if (aecm->echoMode == 4) {
|
|
aecm->aecmCore->supGain = SUPGAIN_DEFAULT << 1;
|
|
aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT << 1;
|
|
aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A << 1;
|
|
aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D << 1;
|
|
aecm->aecmCore->supGainErrParamDiffAB =
|
|
(SUPGAIN_ERROR_PARAM_A << 1) - (SUPGAIN_ERROR_PARAM_B << 1);
|
|
aecm->aecmCore->supGainErrParamDiffBD =
|
|
(SUPGAIN_ERROR_PARAM_B << 1) - (SUPGAIN_ERROR_PARAM_D << 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int32_t WebRtcAecm_InitEchoPath(void* aecmInst,
|
|
const void* echo_path,
|
|
size_t size_bytes) {
|
|
AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
|
|
const int16_t* echo_path_ptr = static_cast<const int16_t*>(echo_path);
|
|
|
|
if (aecmInst == NULL) {
|
|
return -1;
|
|
}
|
|
if (echo_path == NULL) {
|
|
return AECM_NULL_POINTER_ERROR;
|
|
}
|
|
if (size_bytes != WebRtcAecm_echo_path_size_bytes()) {
|
|
// Input channel size does not match the size of AECM
|
|
return AECM_BAD_PARAMETER_ERROR;
|
|
}
|
|
if (aecm->initFlag != kInitCheck) {
|
|
return AECM_UNINITIALIZED_ERROR;
|
|
}
|
|
|
|
WebRtcAecm_InitEchoPathCore(aecm->aecmCore, echo_path_ptr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int32_t WebRtcAecm_GetEchoPath(void* aecmInst,
|
|
void* echo_path,
|
|
size_t size_bytes) {
|
|
AecMobile* aecm = static_cast<AecMobile*>(aecmInst);
|
|
int16_t* echo_path_ptr = static_cast<int16_t*>(echo_path);
|
|
|
|
if (aecmInst == NULL) {
|
|
return -1;
|
|
}
|
|
if (echo_path == NULL) {
|
|
return AECM_NULL_POINTER_ERROR;
|
|
}
|
|
if (size_bytes != WebRtcAecm_echo_path_size_bytes()) {
|
|
// Input channel size does not match the size of AECM
|
|
return AECM_BAD_PARAMETER_ERROR;
|
|
}
|
|
if (aecm->initFlag != kInitCheck) {
|
|
return AECM_UNINITIALIZED_ERROR;
|
|
}
|
|
|
|
memcpy(echo_path_ptr, aecm->aecmCore->channelStored, size_bytes);
|
|
return 0;
|
|
}
|
|
|
|
size_t WebRtcAecm_echo_path_size_bytes() {
|
|
return (PART_LEN1 * sizeof(int16_t));
|
|
}
|
|
|
|
static int WebRtcAecm_EstBufDelay(AecMobile* aecm, short msInSndCardBuf) {
|
|
short delayNew, nSampSndCard;
|
|
short nSampFar = (short)WebRtc_available_read(aecm->farendBuf);
|
|
short diff;
|
|
|
|
nSampSndCard = msInSndCardBuf * kSampMsNb * aecm->aecmCore->mult;
|
|
|
|
delayNew = nSampSndCard - nSampFar;
|
|
|
|
if (delayNew < FRAME_LEN) {
|
|
WebRtc_MoveReadPtr(aecm->farendBuf, FRAME_LEN);
|
|
delayNew += FRAME_LEN;
|
|
}
|
|
|
|
aecm->filtDelay =
|
|
WEBRTC_SPL_MAX(0, (8 * aecm->filtDelay + 2 * delayNew) / 10);
|
|
|
|
diff = aecm->filtDelay - aecm->knownDelay;
|
|
if (diff > 224) {
|
|
if (aecm->lastDelayDiff < 96) {
|
|
aecm->timeForDelayChange = 0;
|
|
} else {
|
|
aecm->timeForDelayChange++;
|
|
}
|
|
} else if (diff < 96 && aecm->knownDelay > 0) {
|
|
if (aecm->lastDelayDiff > 224) {
|
|
aecm->timeForDelayChange = 0;
|
|
} else {
|
|
aecm->timeForDelayChange++;
|
|
}
|
|
} else {
|
|
aecm->timeForDelayChange = 0;
|
|
}
|
|
aecm->lastDelayDiff = diff;
|
|
|
|
if (aecm->timeForDelayChange > 25) {
|
|
aecm->knownDelay = WEBRTC_SPL_MAX((int)aecm->filtDelay - 160, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int WebRtcAecm_DelayComp(AecMobile* aecm) {
|
|
int nSampFar = (int)WebRtc_available_read(aecm->farendBuf);
|
|
int nSampSndCard, delayNew, nSampAdd;
|
|
const int maxStuffSamp = 10 * FRAME_LEN;
|
|
|
|
nSampSndCard = aecm->msInSndCardBuf * kSampMsNb * aecm->aecmCore->mult;
|
|
delayNew = nSampSndCard - nSampFar;
|
|
|
|
if (delayNew > FAR_BUF_LEN - FRAME_LEN * aecm->aecmCore->mult) {
|
|
// The difference of the buffer sizes is larger than the maximum
|
|
// allowed known delay. Compensate by stuffing the buffer.
|
|
nSampAdd =
|
|
(int)(WEBRTC_SPL_MAX(((nSampSndCard >> 1) - nSampFar), FRAME_LEN));
|
|
nSampAdd = WEBRTC_SPL_MIN(nSampAdd, maxStuffSamp);
|
|
|
|
WebRtc_MoveReadPtr(aecm->farendBuf, -nSampAdd);
|
|
aecm->delayChange = 1; // the delay needs to be updated
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
} // namespace webrtc
|