Changed AECM to be built using C++

webrtc/modules/audio_processing/aecm/echo_control_mobile.c

Index: webrtc/modules/audio_processing/aecm/echo_control_mobile.c
diff --git a/webrtc/modules/audio_processing/aecm/echo_control_mobile.c b/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
deleted file mode 100644
index 91e6f0e80ce1afa0579aa111f961734b10b65e11..0000000000000000000000000000000000000000
--- a/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
+++ /dev/null
@@ -1,646 +0,0 @@
-/*
- *  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.
- */
-
-#include "webrtc/modules/audio_processing/aecm/echo_control_mobile.h"
-
-#ifdef AEC_DEBUG
-#include <stdio.h>
-#endif
-#include <stdlib.h>
-
-#include "webrtc/common_audio/ring_buffer.h"
-#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
-#include "webrtc/modules/audio_processing/aecm/aecm_core.h"
-
-#define BUF_SIZE_FRAMES 50 // buffer size (frames)
-// Maximum length of resampled signal. Must be an integer multiple of frames
-// (ceil(1/(1 + MIN_SKEW)*2) + 1)*FRAME_LEN
-// The factor of 2 handles wb, and the + 1 is as a safety margin
-#define MAX_RESAMP_LEN (5 * FRAME_LEN)
-
-static const size_t kBufSizeSamp = BUF_SIZE_FRAMES * FRAME_LEN; // buffer size (samples)
-static const int kSampMsNb = 8; // samples per ms in nb
-// Target suppression levels for nlp modes
-// log{0.001, 0.00001, 0.00000001}
-static const int kInitCheck = 42;
-
-typedef struct
-{
-    int sampFreq;
-    int scSampFreq;
-    short bufSizeStart;
-    int knownDelay;
-
-    // Stores the last frame added to the farend buffer
-    short farendOld[2][FRAME_LEN];
-    short initFlag; // indicates if AEC has been initialized
-
-    // Variables used for averaging far end buffer size
-    short counter;
-    short sum;
-    short firstVal;
-    short checkBufSizeCtr;
-
-    // Variables used for delay shifts
-    short msInSndCardBuf;
-    short filtDelay;
-    int timeForDelayChange;
-    int ECstartup;
-    int checkBuffSize;
-    int delayChange;
-    short lastDelayDiff;
-
-    int16_t echoMode;
-
-#ifdef AEC_DEBUG
-    FILE *bufFile;
-    FILE *delayFile;
-    FILE *preCompFile;
-    FILE *postCompFile;
-#endif // AEC_DEBUG
-    // Structures
-    RingBuffer *farendBuf;
-
-    AecmCore* aecmCore;
-} AecMobile;
-
-// Estimates delay to set the position of the farend buffer read pointer
-// (controlled by knownDelay)
-static int WebRtcAecm_EstBufDelay(AecMobile* aecmInst, short msInSndCardBuf);
-
-// Stuffs the farend buffer if the estimated delay is too large
-static int WebRtcAecm_DelayComp(AecMobile* aecmInst);
-
-void* WebRtcAecm_Create() {
-    AecMobile* aecm = malloc(sizeof(AecMobile));
-
-    WebRtcSpl_Init();
-
-    aecm->aecmCore = WebRtcAecm_CreateCore();
-    if (!aecm->aecmCore) {
-        WebRtcAecm_Free(aecm);
-        return NULL;
-    }
-
-    aecm->farendBuf = WebRtc_CreateBuffer(kBufSizeSamp,
-                                          sizeof(int16_t));
-    if (!aecm->farendBuf)
-    {
-        WebRtcAecm_Free(aecm);
-        return NULL;
-    }
-
-    aecm->initFlag = 0;
-
-#ifdef AEC_DEBUG
-    aecm->aecmCore->farFile = fopen("aecFar.pcm","wb");
-    aecm->aecmCore->nearFile = fopen("aecNear.pcm","wb");
-    aecm->aecmCore->outFile = fopen("aecOut.pcm","wb");
-    //aecm->aecmCore->outLpFile = fopen("aecOutLp.pcm","wb");
-
-    aecm->bufFile = fopen("aecBuf.dat", "wb");
-    aecm->delayFile = fopen("aecDelay.dat", "wb");
-    aecm->preCompFile = fopen("preComp.pcm", "wb");
-    aecm->postCompFile = fopen("postComp.pcm", "wb");
-#endif // AEC_DEBUG
-    return aecm;
-}
-
-void WebRtcAecm_Free(void* aecmInst) {
-  AecMobile* aecm = aecmInst;
-
-    if (aecm == NULL) {
-      return;
-    }
-
-#ifdef AEC_DEBUG
-    fclose(aecm->aecmCore->farFile);
-    fclose(aecm->aecmCore->nearFile);
-    fclose(aecm->aecmCore->outFile);
-    //fclose(aecm->aecmCore->outLpFile);
-
-    fclose(aecm->bufFile);
-    fclose(aecm->delayFile);
-    fclose(aecm->preCompFile);
-    fclose(aecm->postCompFile);
-#endif // AEC_DEBUG
-    WebRtcAecm_FreeCore(aecm->aecmCore);
-    WebRtc_FreeBuffer(aecm->farendBuf);
-    free(aecm);
-}
-
-int32_t WebRtcAecm_Init(void *aecmInst, int32_t sampFreq)
-{
-  AecMobile* aecm = aecmInst;
-    AecmConfig aecConfig;
-
-    if (aecm == NULL)
-    {
-        return -1;
-    }
-
-    if (sampFreq != 8000 && sampFreq != 16000)
-    {
-        return AECM_BAD_PARAMETER_ERROR;
-    }
-    aecm->sampFreq = sampFreq;
-
-    // Initialize AECM core
-    if (WebRtcAecm_InitCore(aecm->aecmCore, aecm->sampFreq) == -1)
-    {
-        return AECM_UNSPECIFIED_ERROR;
-    }
-
-    // Initialize farend buffer
-    WebRtc_InitBuffer(aecm->farendBuf);
-
-    aecm->initFlag = kInitCheck; // indicates that initialization has been done
-
-    aecm->delayChange = 1;
-
-    aecm->sum = 0;
-    aecm->counter = 0;
-    aecm->checkBuffSize = 1;
-    aecm->firstVal = 0;
-
-    aecm->ECstartup = 1;
-    aecm->bufSizeStart = 0;
-    aecm->checkBufSizeCtr = 0;
-    aecm->filtDelay = 0;
-    aecm->timeForDelayChange = 0;
-    aecm->knownDelay = 0;
-    aecm->lastDelayDiff = 0;
-
-    memset(&aecm->farendOld[0][0], 0, 160);
-
-    // Default settings.
-    aecConfig.cngMode = AecmTrue;
-    aecConfig.echoMode = 3;
-
-    if (WebRtcAecm_set_config(aecm, aecConfig) == -1)
-    {
-        return AECM_UNSPECIFIED_ERROR;
-    }
-
-    return 0;
-}
-
-// Returns any error that is caused when buffering the
-// farend signal.
-int32_t WebRtcAecm_GetBufferFarendError(void *aecmInst, const int16_t *farend,
-                                size_t nrOfSamples) {
-  AecMobile* aecm = aecmInst;
-
-  if (aecm == NULL)
-    return -1;
-
-  if (farend == NULL)
-    return AECM_NULL_POINTER_ERROR;
-
-  if (aecm->initFlag != kInitCheck)
-    return AECM_UNINITIALIZED_ERROR;
-
-  if (nrOfSamples != 80 && nrOfSamples != 160)
-    return AECM_BAD_PARAMETER_ERROR;
-
-  return 0;
-}
-
-
-int32_t WebRtcAecm_BufferFarend(void *aecmInst, const int16_t *farend,
-                                size_t nrOfSamples) {
-  AecMobile* aecm = aecmInst;
-
-  const int32_t err =
-      WebRtcAecm_GetBufferFarendError(aecmInst, farend, nrOfSamples);
-
-  if (err != 0)
-    return err;
-
-  // TODO(unknown): Is this really a good idea?
-  if (!aecm->ECstartup)
-  {
-    WebRtcAecm_DelayComp(aecm);
-  }
-
-  WebRtc_WriteBuffer(aecm->farendBuf, farend, nrOfSamples);
-
-  return 0;
-}
-
-int32_t WebRtcAecm_Process(void *aecmInst, const int16_t *nearendNoisy,
-                           const int16_t *nearendClean, int16_t *out,
-                           size_t nrOfSamples, int16_t msInSndCardBuf)
-{
-  AecMobile* aecm = aecmInst;
-    int32_t retVal = 0;
-    size_t i;
-    short nmbrOfFilledBuffers;
-    size_t nBlocks10ms;
-    size_t nFrames;
-#ifdef AEC_DEBUG
-    short msInAECBuf;
-#endif
-
-    if (aecm == NULL)
-    {
-        return -1;
-    }
-
-    if (nearendNoisy == NULL)
-    {
-        return AECM_NULL_POINTER_ERROR;
-    }
-
-    if (out == NULL)
-    {
-        return AECM_NULL_POINTER_ERROR;
-    }
-
-    if (aecm->initFlag != kInitCheck)
-    {
-        return AECM_UNINITIALIZED_ERROR;
-    }
-
-    if (nrOfSamples != 80 && nrOfSamples != 160)
-    {
-        return AECM_BAD_PARAMETER_ERROR;
-    }
-
-    if (msInSndCardBuf < 0)
-    {
-        msInSndCardBuf = 0;
-        retVal = AECM_BAD_PARAMETER_WARNING;
-    } else if (msInSndCardBuf > 500)
-    {
-        msInSndCardBuf = 500;
-        retVal = AECM_BAD_PARAMETER_WARNING;
-    }
-    msInSndCardBuf += 10;
-    aecm->msInSndCardBuf = msInSndCardBuf;
-
-    nFrames = nrOfSamples / FRAME_LEN;
-    nBlocks10ms = nFrames / aecm->aecmCore->mult;
-
-    if (aecm->ECstartup)
-    {
-        if (nearendClean == NULL)
-        {
-            if (out != nearendNoisy)
-            {
-                memcpy(out, nearendNoisy, sizeof(short) * nrOfSamples);
-            }
-        } else if (out != nearendClean)
-        {
-            memcpy(out, nearendClean, sizeof(short) * nrOfSamples);
-        }
-
-        nmbrOfFilledBuffers =
-            (short) WebRtc_available_read(aecm->farendBuf) / FRAME_LEN;
-        // The AECM is in the start up mode
-        // AECM is disabled until the soundcard buffer and farend buffers are OK
-
-        // Mechanism to ensure that the soundcard buffer is reasonably stable.
-        if (aecm->checkBuffSize)
-        {
-            aecm->checkBufSizeCtr++;
-            // Before we fill up the far end buffer we require the amount of data on the
-            // sound card to be stable (+/-8 ms) compared to the first value. This
-            // comparison is made during the following 4 consecutive frames. If it seems
-            // to be stable then we start to fill up the far end buffer.
-
-            if (aecm->counter == 0)
-            {
-                aecm->firstVal = aecm->msInSndCardBuf;
-                aecm->sum = 0;
-            }
-
-            if (abs(aecm->firstVal - aecm->msInSndCardBuf)
-                    < WEBRTC_SPL_MAX(0.2 * aecm->msInSndCardBuf, kSampMsNb))
-            {
-                aecm->sum += aecm->msInSndCardBuf;
-                aecm->counter++;
-            } else
-            {
-                aecm->counter = 0;
-            }
-
-            if (aecm->counter * nBlocks10ms >= 6)
-            {
-                // The farend buffer size is determined in blocks of 80 samples
-                // Use 75% of the average value of the soundcard buffer
-                aecm->bufSizeStart
-                        = WEBRTC_SPL_MIN((3 * aecm->sum
-                                        * aecm->aecmCore->mult) / (aecm->counter * 40), BUF_SIZE_FRAMES);
-                // buffersize has now been determined
-                aecm->checkBuffSize = 0;
-            }
-
-            if (aecm->checkBufSizeCtr * nBlocks10ms > 50)
-            {
-                // for really bad sound cards, don't disable echocanceller for more than 0.5 sec
-                aecm->bufSizeStart = WEBRTC_SPL_MIN((3 * aecm->msInSndCardBuf
-                                * aecm->aecmCore->mult) / 40, BUF_SIZE_FRAMES);
-                aecm->checkBuffSize = 0;
-            }
-        }
-
-        // if checkBuffSize changed in the if-statement above
-        if (!aecm->checkBuffSize)
-        {
-            // soundcard buffer is now reasonably stable
-            // When the far end buffer is filled with approximately the same amount of
-            // data as the amount on the sound card we end the start up phase and start
-            // to cancel echoes.
-
-            if (nmbrOfFilledBuffers == aecm->bufSizeStart)
-            {
-                aecm->ECstartup = 0; // Enable the AECM
-            } else if (nmbrOfFilledBuffers > aecm->bufSizeStart)
-            {
-                WebRtc_MoveReadPtr(aecm->farendBuf,
-                                   (int) WebRtc_available_read(aecm->farendBuf)
-                                   - (int) aecm->bufSizeStart * FRAME_LEN);
-                aecm->ECstartup = 0;
-            }
-        }
-
-    } else
-    {
-        // AECM is enabled
-
-        // Note only 1 block supported for nb and 2 blocks for wb
-        for (i = 0; i < nFrames; i++)
-        {
-            int16_t farend[FRAME_LEN];
-            const int16_t* farend_ptr = NULL;
-
-            nmbrOfFilledBuffers =
-                (short) WebRtc_available_read(aecm->farendBuf) / FRAME_LEN;
-
-            // Check that there is data in the far end buffer
-            if (nmbrOfFilledBuffers > 0)
-            {
-                // Get the next 80 samples from the farend buffer
-                WebRtc_ReadBuffer(aecm->farendBuf, (void**) &farend_ptr, farend,
-                                  FRAME_LEN);
-
-                // Always store the last frame for use when we run out of data
-                memcpy(&(aecm->farendOld[i][0]), farend_ptr,
-                       FRAME_LEN * sizeof(short));
-            } else
-            {
-                // We have no data so we use the last played frame
-                memcpy(farend, &(aecm->farendOld[i][0]), FRAME_LEN * sizeof(short));
-                farend_ptr = farend;
-            }
-
-            // Call buffer delay estimator when all data is extracted,
-            // i,e. i = 0 for NB and i = 1 for WB
-            if ((i == 0 && aecm->sampFreq == 8000) || (i == 1 && aecm->sampFreq == 16000))
-            {
-                WebRtcAecm_EstBufDelay(aecm, aecm->msInSndCardBuf);
-            }
-
-            // Call the AECM
-            /*WebRtcAecm_ProcessFrame(aecm->aecmCore, farend, &nearend[FRAME_LEN * i],
-             &out[FRAME_LEN * i], aecm->knownDelay);*/
-            if (WebRtcAecm_ProcessFrame(aecm->aecmCore,
-                                        farend_ptr,
-                                        &nearendNoisy[FRAME_LEN * i],
-                                        (nearendClean
-                                         ? &nearendClean[FRAME_LEN * i]
-                                         : NULL),
-                                        &out[FRAME_LEN * i]) == -1)
-                return -1;
-        }
-    }
-
-#ifdef AEC_DEBUG
-    msInAECBuf = (short) WebRtc_available_read(aecm->farendBuf) /
-        (kSampMsNb * aecm->aecmCore->mult);
-    fwrite(&msInAECBuf, 2, 1, aecm->bufFile);
-    fwrite(&(aecm->knownDelay), sizeof(aecm->knownDelay), 1, aecm->delayFile);
-#endif
-
-    return retVal;
-}
-
-int32_t WebRtcAecm_set_config(void *aecmInst, AecmConfig config)
-{
-  AecMobile* aecm = aecmInst;
-
-    if (aecm == NULL)
-    {
-        return -1;
-    }
-
-    if (aecm->initFlag != kInitCheck)
-    {
-        return AECM_UNINITIALIZED_ERROR;
-    }
-
-    if (config.cngMode != AecmFalse && config.cngMode != AecmTrue)
-    {
-        return AECM_BAD_PARAMETER_ERROR;
-    }
-    aecm->aecmCore->cngMode = config.cngMode;
-
-    if (config.echoMode < 0 || config.echoMode > 4)
-    {
-        return AECM_BAD_PARAMETER_ERROR;
-    }
-    aecm->echoMode = config.echoMode;
-
-    if (aecm->echoMode == 0)
-    {
-        aecm->aecmCore->supGain = SUPGAIN_DEFAULT >> 3;
-        aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT >> 3;
-        aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A >> 3;
-        aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D >> 3;
-        aecm->aecmCore->supGainErrParamDiffAB = (SUPGAIN_ERROR_PARAM_A >> 3)
-                - (SUPGAIN_ERROR_PARAM_B >> 3);
-        aecm->aecmCore->supGainErrParamDiffBD = (SUPGAIN_ERROR_PARAM_B >> 3)
-                - (SUPGAIN_ERROR_PARAM_D >> 3);
-    } else if (aecm->echoMode == 1)
-    {
-        aecm->aecmCore->supGain = SUPGAIN_DEFAULT >> 2;
-        aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT >> 2;
-        aecm->aecmCore->supGainErrParamA = SUPGAIN_ERROR_PARAM_A >> 2;
-        aecm->aecmCore->supGainErrParamD = SUPGAIN_ERROR_PARAM_D >> 2;
-        aecm->aecmCore->supGainErrParamDiffAB = (SUPGAIN_ERROR_PARAM_A >> 2)
-                - (SUPGAIN_ERROR_PARAM_B >> 2);
-        aecm->aecmCore->supGainErrParamDiffBD = (SUPGAIN_ERROR_PARAM_B >> 2)
-                - (SUPGAIN_ERROR_PARAM_D >> 2);
-    } else if (aecm->echoMode == 2)
-    {
-        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);
-    } else if (aecm->echoMode == 3)
-    {
-        aecm->aecmCore->supGain = SUPGAIN_DEFAULT;
-        aecm->aecmCore->supGainOld = SUPGAIN_DEFAULT;
-        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 = aecmInst;
-    const int16_t* echo_path_ptr = 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 = aecmInst;
-    int16_t* echo_path_ptr = 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;
-}