diff --git a/webrtc/modules/audio_processing/aec/echo_cancellation.c b/webrtc/modules/audio_processing/aec/echo_cancellation.c
index 0f5cd31ddb..175ef3d798 100644
--- a/webrtc/modules/audio_processing/aec/echo_cancellation.c
+++ b/webrtc/modules/audio_processing/aec/echo_cancellation.c
@@ -146,7 +146,6 @@ void* WebRtcAec_Create() {
   }
 
   aecpc->initFlag = 0;
-  aecpc->lastError = 0;
 
 #ifdef WEBRTC_AEC_DEBUG_DUMP
   {
@@ -192,26 +191,22 @@ int32_t WebRtcAec_Init(void* aecInst, int32_t sampFreq, int32_t scSampFreq) {
       sampFreq != 16000 &&
       sampFreq != 32000 &&
       sampFreq != 48000) {
-    aecpc->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
   aecpc->sampFreq = sampFreq;
 
   if (scSampFreq < 1 || scSampFreq > 96000) {
-    aecpc->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
   aecpc->scSampFreq = scSampFreq;
 
   // Initialize echo canceller core
   if (WebRtcAec_InitAec(aecpc->aec, aecpc->sampFreq) == -1) {
-    aecpc->lastError = AEC_UNSPECIFIED_ERROR;
-    return -1;
+    return AEC_UNSPECIFIED_ERROR;
   }
 
   if (WebRtcAec_InitResampler(aecpc->resampler, aecpc->scSampFreq) == -1) {
-    aecpc->lastError = AEC_UNSPECIFIED_ERROR;
-    return -1;
+    return AEC_UNSPECIFIED_ERROR;
   }
 
   WebRtc_InitBuffer(aecpc->far_pre_buf);
@@ -261,13 +256,32 @@ int32_t WebRtcAec_Init(void* aecInst, int32_t sampFreq, int32_t scSampFreq) {
   aecConfig.delay_logging = kAecFalse;
 
   if (WebRtcAec_set_config(aecpc, aecConfig) == -1) {
-    aecpc->lastError = AEC_UNSPECIFIED_ERROR;
-    return -1;
+    return AEC_UNSPECIFIED_ERROR;
   }
 
   return 0;
 }
 
+// Returns any error that is caused when buffering the
+// far-end signal.
+int32_t WebRtcAec_GetBufferFarendError(void* aecInst,
+                                       const float* farend,
+                                       size_t nrOfSamples) {
+  Aec* aecpc = aecInst;
+
+  if (!farend)
+    return AEC_NULL_POINTER_ERROR;
+
+  if (aecpc->initFlag != initCheck)
+    return AEC_UNINITIALIZED_ERROR;
+
+  // number of samples == 160 for SWB input
+  if (nrOfSamples != 80 && nrOfSamples != 160)
+    return AEC_BAD_PARAMETER_ERROR;
+
+  return 0;
+}
+
 // only buffer L band for farend
 int32_t WebRtcAec_BufferFarend(void* aecInst,
                                const float* farend,
@@ -277,21 +291,13 @@ int32_t WebRtcAec_BufferFarend(void* aecInst,
   float new_farend[MAX_RESAMP_LEN];
   const float* farend_ptr = farend;
 
-  if (farend == NULL) {
-    aecpc->lastError = AEC_NULL_POINTER_ERROR;
-    return -1;
-  }
+  // Get any error caused by buffering the farend signal.
+  int32_t error_code = WebRtcAec_GetBufferFarendError(aecInst, farend,
+                                                      nrOfSamples);
 
-  if (aecpc->initFlag != initCheck) {
-    aecpc->lastError = AEC_UNINITIALIZED_ERROR;
-    return -1;
-  }
+  if (error_code != 0)
+    return error_code;
 
-  // number of samples == 160 for SWB input
-  if (nrOfSamples != 80 && nrOfSamples != 160) {
-    aecpc->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
-  }
 
   if (aecpc->skewMode == kAecTrue && aecpc->resample == kAecTrue) {
     // Resample and get a new number of samples
@@ -343,29 +349,24 @@ int32_t WebRtcAec_Process(void* aecInst,
   int32_t retVal = 0;
 
   if (out == NULL) {
-    aecpc->lastError = AEC_NULL_POINTER_ERROR;
-    return -1;
+    return AEC_NULL_POINTER_ERROR;
   }
 
   if (aecpc->initFlag != initCheck) {
-    aecpc->lastError = AEC_UNINITIALIZED_ERROR;
-    return -1;
+    return AEC_UNINITIALIZED_ERROR;
   }
 
   // number of samples == 160 for SWB input
   if (nrOfSamples != 80 && nrOfSamples != 160) {
-    aecpc->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
 
   if (msInSndCardBuf < 0) {
     msInSndCardBuf = 0;
-    aecpc->lastError = AEC_BAD_PARAMETER_WARNING;
-    retVal = -1;
+    retVal = AEC_BAD_PARAMETER_WARNING;
   } else if (msInSndCardBuf > kMaxTrustedDelayMs) {
     // The clamping is now done in ProcessExtended/Normal().
-    aecpc->lastError = AEC_BAD_PARAMETER_WARNING;
-    retVal = -1;
+    retVal = AEC_BAD_PARAMETER_WARNING;
   }
 
   // This returns the value of aec->extended_filter_enabled.
@@ -378,15 +379,13 @@ int32_t WebRtcAec_Process(void* aecInst,
                     msInSndCardBuf,
                     skew);
   } else {
-    if (ProcessNormal(aecpc,
-                      nearend,
-                      num_bands,
-                      out,
-                      nrOfSamples,
-                      msInSndCardBuf,
-                      skew) != 0) {
-      retVal = -1;
-    }
+    retVal = ProcessNormal(aecpc,
+                           nearend,
+                           num_bands,
+                           out,
+                           nrOfSamples,
+                           msInSndCardBuf,
+                           skew);
   }
 
 #ifdef WEBRTC_AEC_DEBUG_DUMP
@@ -405,31 +404,26 @@ int32_t WebRtcAec_Process(void* aecInst,
 int WebRtcAec_set_config(void* handle, AecConfig config) {
   Aec* self = (Aec*)handle;
   if (self->initFlag != initCheck) {
-    self->lastError = AEC_UNINITIALIZED_ERROR;
-    return -1;
+    return AEC_UNINITIALIZED_ERROR;
   }
 
   if (config.skewMode != kAecFalse && config.skewMode != kAecTrue) {
-    self->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
   self->skewMode = config.skewMode;
 
   if (config.nlpMode != kAecNlpConservative &&
       config.nlpMode != kAecNlpModerate &&
       config.nlpMode != kAecNlpAggressive) {
-    self->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
 
   if (config.metricsMode != kAecFalse && config.metricsMode != kAecTrue) {
-    self->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
 
   if (config.delay_logging != kAecFalse && config.delay_logging != kAecTrue) {
-    self->lastError = AEC_BAD_PARAMETER_ERROR;
-    return -1;
+    return AEC_BAD_PARAMETER_ERROR;
   }
 
   WebRtcAec_SetConfigCore(
@@ -440,12 +434,10 @@ int WebRtcAec_set_config(void* handle, AecConfig config) {
 int WebRtcAec_get_echo_status(void* handle, int* status) {
   Aec* self = (Aec*)handle;
   if (status == NULL) {
-    self->lastError = AEC_NULL_POINTER_ERROR;
-    return -1;
+    return AEC_NULL_POINTER_ERROR;
   }
   if (self->initFlag != initCheck) {
-    self->lastError = AEC_UNINITIALIZED_ERROR;
-    return -1;
+    return AEC_UNINITIALIZED_ERROR;
   }
 
   *status = WebRtcAec_echo_state(self->aec);
@@ -466,12 +458,10 @@ int WebRtcAec_GetMetrics(void* handle, AecMetrics* metrics) {
     return -1;
   }
   if (metrics == NULL) {
-    self->lastError = AEC_NULL_POINTER_ERROR;
-    return -1;
+    return AEC_NULL_POINTER_ERROR;
   }
   if (self->initFlag != initCheck) {
-    self->lastError = AEC_UNINITIALIZED_ERROR;
-    return -1;
+    return AEC_UNINITIALIZED_ERROR;
   }
 
   WebRtcAec_GetEchoStats(self->aec, &erl, &erle, &a_nlp);
@@ -556,32 +546,24 @@ int WebRtcAec_GetDelayMetrics(void* handle,
                               float* fraction_poor_delays) {
   Aec* self = handle;
   if (median == NULL) {
-    self->lastError = AEC_NULL_POINTER_ERROR;
-    return -1;
+    return AEC_NULL_POINTER_ERROR;
   }
   if (std == NULL) {
-    self->lastError = AEC_NULL_POINTER_ERROR;
-    return -1;
+    return AEC_NULL_POINTER_ERROR;
   }
   if (self->initFlag != initCheck) {
-    self->lastError = AEC_UNINITIALIZED_ERROR;
-    return -1;
+    return AEC_UNINITIALIZED_ERROR;
   }
   if (WebRtcAec_GetDelayMetricsCore(self->aec, median, std,
                                     fraction_poor_delays) ==
       -1) {
     // Logging disabled.
-    self->lastError = AEC_UNSUPPORTED_FUNCTION_ERROR;
-    return -1;
+    return AEC_UNSUPPORTED_FUNCTION_ERROR;
   }
 
   return 0;
 }
 
-int32_t WebRtcAec_get_error_code(void* aecInst) {
-  Aec* aecpc = aecInst;
-  return aecpc->lastError;
-}
 
 AecCore* WebRtcAec_aec_core(void* handle) {
   if (!handle) {
@@ -617,7 +599,7 @@ static int ProcessNormal(Aec* aecpc,
       retVal = WebRtcAec_GetSkew(aecpc->resampler, skew, &aecpc->skew);
       if (retVal == -1) {
         aecpc->skew = 0;
-        aecpc->lastError = AEC_BAD_PARAMETER_WARNING;
+        retVal = AEC_BAD_PARAMETER_WARNING;
       }
 
       aecpc->skew /= aecpc->sampFactor * nrOfSamples;
diff --git a/webrtc/modules/audio_processing/aec/echo_cancellation_internal.h b/webrtc/modules/audio_processing/aec/echo_cancellation_internal.h
index 95a6cf3324..e87219f33d 100644
--- a/webrtc/modules/audio_processing/aec/echo_cancellation_internal.h
+++ b/webrtc/modules/audio_processing/aec/echo_cancellation_internal.h
@@ -57,8 +57,6 @@ typedef struct {
 
   RingBuffer* far_pre_buf;  // Time domain far-end pre-buffer.
 
-  int lastError;
-
   int farend_started;
 
   AecCore* aec;
diff --git a/webrtc/modules/audio_processing/aec/include/echo_cancellation.h b/webrtc/modules/audio_processing/aec/include/echo_cancellation.h
index a340cf84d0..90a248f0b6 100644
--- a/webrtc/modules/audio_processing/aec/include/echo_cancellation.h
+++ b/webrtc/modules/audio_processing/aec/include/echo_cancellation.h
@@ -109,12 +109,31 @@ int32_t WebRtcAec_Init(void* aecInst, int32_t sampFreq, int32_t scSampFreq);
  * Outputs                      Description
  * -------------------------------------------------------------------
  * int32_t        return        0: OK
- *                             -1: error
+ *                              12000-12050: error code
  */
 int32_t WebRtcAec_BufferFarend(void* aecInst,
                                const float* farend,
                                size_t nrOfSamples);
 
+/*
+ * Reports any errors that would arise if buffering a farend buffer
+ *
+ * Inputs                       Description
+ * -------------------------------------------------------------------
+ * void*          aecInst       Pointer to the AEC instance
+ * const float*   farend        In buffer containing one frame of
+ *                              farend signal for L band
+ * int16_t        nrOfSamples   Number of samples in farend buffer
+ *
+ * Outputs                      Description
+ * -------------------------------------------------------------------
+ * int32_t        return        0: OK
+ *                              12000-12050: error code
+ */
+int32_t WebRtcAec_GetBufferFarendError(void* aecInst,
+                                       const float* farend,
+                                       size_t nrOfSamples);
+
 /*
  * Runs the echo canceller on an 80 or 160 sample blocks of data.
  *
@@ -136,7 +155,7 @@ int32_t WebRtcAec_BufferFarend(void* aecInst,
  * float* const* out            Out buffer, one frame of processed nearend
  *                              for each band
  * int32_t       return         0: OK
- *                             -1: error
+ *                              12000-12050: error code
  */
 int32_t WebRtcAec_Process(void* aecInst,
                           const float* const* nearend,
@@ -157,8 +176,8 @@ int32_t WebRtcAec_Process(void* aecInst,
  *
  * Outputs                      Description
  * -------------------------------------------------------------------
- * int            return         0: OK
- *                              -1: error
+ * int            return        0: OK
+ *                              12000-12050: error code
  */
 int WebRtcAec_set_config(void* handle, AecConfig config);
 
@@ -173,8 +192,8 @@ int WebRtcAec_set_config(void* handle, AecConfig config);
  * -------------------------------------------------------------------
  * int*           status        0: Almost certainly nearend single-talk
  *                              1: Might not be neared single-talk
- * int            return         0: OK
- *                              -1: error
+ * int            return        0: OK
+ *                              12000-12050: error code
  */
 int WebRtcAec_get_echo_status(void* handle, int* status);
 
@@ -189,8 +208,8 @@ int WebRtcAec_get_echo_status(void* handle, int* status);
  * -------------------------------------------------------------------
  * AecMetrics*    metrics       Struct which will be filled out with the
  *                              current echo metrics.
- * int            return         0: OK
- *                              -1: error
+ * int            return        0: OK
+ *                              12000-12050: error code
  */
 int WebRtcAec_GetMetrics(void* handle, AecMetrics* metrics);
 
@@ -208,27 +227,14 @@ int WebRtcAec_GetMetrics(void* handle, AecMetrics* metrics);
  * float*  fraction_poor_delays Fraction of the delay estimates that may
  *                              cause the AEC to perform poorly.
  *
- * int     return                0: OK
- *                              -1: error
+ * int            return        0: OK
+ *                              12000-12050: error code
  */
 int WebRtcAec_GetDelayMetrics(void* handle,
                               int* median,
                               int* std,
                               float* fraction_poor_delays);
 
-/*
- * Gets the last error code.
- *
- * Inputs                       Description
- * -------------------------------------------------------------------
- * void*          aecInst       Pointer to the AEC instance
- *
- * Outputs                      Description
- * -------------------------------------------------------------------
- * int32_t        return        11000-11100: error code
- */
-int32_t WebRtcAec_get_error_code(void* aecInst);
-
 // Returns a pointer to the low level AEC handle.
 //
 // Input:
diff --git a/webrtc/modules/audio_processing/aecm/echo_control_mobile.c b/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
index 83781e97fe..f59cd125f2 100644
--- a/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
+++ b/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
@@ -68,8 +68,6 @@ typedef struct
     // Structures
     RingBuffer *farendBuf;
 
-    int lastError;
-
     AecmCore* aecmCore;
 } AecMobile;
 
@@ -100,7 +98,6 @@ void* WebRtcAecm_Create() {
     }
 
     aecm->initFlag = 0;
-    aecm->lastError = 0;
 
 #ifdef AEC_DEBUG
     aecm->aecmCore->farFile = fopen("aecFar.pcm","wb");
@@ -151,16 +148,14 @@ int32_t WebRtcAecm_Init(void *aecmInst, int32_t sampFreq)
 
     if (sampFreq != 8000 && sampFreq != 16000)
     {
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
+        return AECM_BAD_PARAMETER_ERROR;
     }
     aecm->sampFreq = sampFreq;
 
     // Initialize AECM core
     if (WebRtcAecm_InitCore(aecm->aecmCore, aecm->sampFreq) == -1)
     {
-        aecm->lastError = AECM_UNSPECIFIED_ERROR;
-        return -1;
+        return AECM_UNSPECIFIED_ERROR;
     }
 
     // Initialize farend buffer
@@ -191,51 +186,53 @@ int32_t WebRtcAecm_Init(void *aecmInst, int32_t sampFreq)
 
     if (WebRtcAecm_set_config(aecm, aecConfig) == -1)
     {
-        aecm->lastError = AECM_UNSPECIFIED_ERROR;
-        return -1;
+        return AECM_UNSPECIFIED_ERROR;
     }
 
     return 0;
 }
 
-int32_t WebRtcAecm_BufferFarend(void *aecmInst, const int16_t *farend,
-                                size_t nrOfSamples)
-{
+// 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;
-    int32_t retVal = 0;
 
-    if (aecm == NULL)
-    {
-        return -1;
-    }
+  if (aecm == NULL)
+    return -1;
 
-    if (farend == NULL)
-    {
-        aecm->lastError = AECM_NULL_POINTER_ERROR;
-        return -1;
-    }
+  if (farend == NULL)
+    return AECM_NULL_POINTER_ERROR;
 
-    if (aecm->initFlag != kInitCheck)
-    {
-        aecm->lastError = AECM_UNINITIALIZED_ERROR;
-        return -1;
-    }
+  if (aecm->initFlag != kInitCheck)
+    return AECM_UNINITIALIZED_ERROR;
 
-    if (nrOfSamples != 80 && nrOfSamples != 160)
-    {
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
-    }
+  if (nrOfSamples != 80 && nrOfSamples != 160)
+    return AECM_BAD_PARAMETER_ERROR;
 
-    // TODO: Is this really a good idea?
-    if (!aecm->ECstartup)
-    {
-        WebRtcAecm_DelayComp(aecm);
-    }
+  return 0;
+}
 
-    WebRtc_WriteBuffer(aecm->farendBuf, farend, nrOfSamples);
 
-    return retVal;
+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,
@@ -259,38 +256,32 @@ int32_t WebRtcAecm_Process(void *aecmInst, const int16_t *nearendNoisy,
 
     if (nearendNoisy == NULL)
     {
-        aecm->lastError = AECM_NULL_POINTER_ERROR;
-        return -1;
+        return AECM_NULL_POINTER_ERROR;
     }
 
     if (out == NULL)
     {
-        aecm->lastError = AECM_NULL_POINTER_ERROR;
-        return -1;
+        return AECM_NULL_POINTER_ERROR;
     }
 
     if (aecm->initFlag != kInitCheck)
     {
-        aecm->lastError = AECM_UNINITIALIZED_ERROR;
-        return -1;
+        return AECM_UNINITIALIZED_ERROR;
     }
 
     if (nrOfSamples != 80 && nrOfSamples != 160)
     {
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
+        return AECM_BAD_PARAMETER_ERROR;
     }
 
     if (msInSndCardBuf < 0)
     {
         msInSndCardBuf = 0;
-        aecm->lastError = AECM_BAD_PARAMETER_WARNING;
-        retVal = -1;
+        retVal = AECM_BAD_PARAMETER_WARNING;
     } else if (msInSndCardBuf > 500)
     {
         msInSndCardBuf = 500;
-        aecm->lastError = AECM_BAD_PARAMETER_WARNING;
-        retVal = -1;
+        retVal = AECM_BAD_PARAMETER_WARNING;
     }
     msInSndCardBuf += 10;
     aecm->msInSndCardBuf = msInSndCardBuf;
@@ -453,21 +444,18 @@ int32_t WebRtcAecm_set_config(void *aecmInst, AecmConfig config)
 
     if (aecm->initFlag != kInitCheck)
     {
-        aecm->lastError = AECM_UNINITIALIZED_ERROR;
-        return -1;
+        return AECM_UNINITIALIZED_ERROR;
     }
 
     if (config.cngMode != AecmFalse && config.cngMode != AecmTrue)
     {
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
+        return AECM_BAD_PARAMETER_ERROR;
     }
     aecm->aecmCore->cngMode = config.cngMode;
 
     if (config.echoMode < 0 || config.echoMode > 4)
     {
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
+        return AECM_BAD_PARAMETER_ERROR;
     }
     aecm->echoMode = config.echoMode;
 
@@ -524,33 +512,6 @@ int32_t WebRtcAecm_set_config(void *aecmInst, AecmConfig config)
     return 0;
 }
 
-int32_t WebRtcAecm_get_config(void *aecmInst, AecmConfig *config)
-{
-  AecMobile* aecm = aecmInst;
-
-    if (aecm == NULL)
-    {
-        return -1;
-    }
-
-    if (config == NULL)
-    {
-        aecm->lastError = AECM_NULL_POINTER_ERROR;
-        return -1;
-    }
-
-    if (aecm->initFlag != kInitCheck)
-    {
-        aecm->lastError = AECM_UNINITIALIZED_ERROR;
-        return -1;
-    }
-
-    config->cngMode = aecm->aecmCore->cngMode;
-    config->echoMode = aecm->echoMode;
-
-    return 0;
-}
-
 int32_t WebRtcAecm_InitEchoPath(void* aecmInst,
                                 const void* echo_path,
                                 size_t size_bytes)
@@ -562,19 +523,16 @@ int32_t WebRtcAecm_InitEchoPath(void* aecmInst,
       return -1;
     }
     if (echo_path == NULL) {
-      aecm->lastError = AECM_NULL_POINTER_ERROR;
-      return -1;
+      return AECM_NULL_POINTER_ERROR;
     }
     if (size_bytes != WebRtcAecm_echo_path_size_bytes())
     {
         // Input channel size does not match the size of AECM
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
+        return AECM_BAD_PARAMETER_ERROR;
     }
     if (aecm->initFlag != kInitCheck)
     {
-        aecm->lastError = AECM_UNINITIALIZED_ERROR;
-        return -1;
+        return AECM_UNINITIALIZED_ERROR;
     }
 
     WebRtcAecm_InitEchoPathCore(aecm->aecmCore, echo_path_ptr);
@@ -593,19 +551,16 @@ int32_t WebRtcAecm_GetEchoPath(void* aecmInst,
       return -1;
     }
     if (echo_path == NULL) {
-      aecm->lastError = AECM_NULL_POINTER_ERROR;
-      return -1;
+      return AECM_NULL_POINTER_ERROR;
     }
     if (size_bytes != WebRtcAecm_echo_path_size_bytes())
     {
         // Input channel size does not match the size of AECM
-        aecm->lastError = AECM_BAD_PARAMETER_ERROR;
-        return -1;
+        return AECM_BAD_PARAMETER_ERROR;
     }
     if (aecm->initFlag != kInitCheck)
     {
-        aecm->lastError = AECM_UNINITIALIZED_ERROR;
-        return -1;
+        return AECM_UNINITIALIZED_ERROR;
     }
 
     memcpy(echo_path_ptr, aecm->aecmCore->channelStored, size_bytes);
@@ -617,17 +572,6 @@ size_t WebRtcAecm_echo_path_size_bytes()
     return (PART_LEN1 * sizeof(int16_t));
 }
 
-int32_t WebRtcAecm_get_error_code(void *aecmInst)
-{
-  AecMobile* aecm = aecmInst;
-
-    if (aecm == NULL)
-    {
-        return -1;
-    }
-
-    return aecm->lastError;
-}
 
 static int WebRtcAecm_EstBufDelay(AecMobile* aecm, short msInSndCardBuf) {
     short delayNew, nSampSndCard;
diff --git a/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h b/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h
index 7ae15c2a3d..b29f078bf7 100644
--- a/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h
+++ b/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h
@@ -66,7 +66,7 @@ void WebRtcAecm_Free(void* aecmInst);
  * Outputs                      Description
  * -------------------------------------------------------------------
  * int32_t        return        0: OK
- *                             -1: error
+ *                              1200-12004,12100: error/warning
  */
 int32_t WebRtcAecm_Init(void* aecmInst, int32_t sampFreq);
 
@@ -83,12 +83,31 @@ int32_t WebRtcAecm_Init(void* aecmInst, int32_t sampFreq);
  * Outputs                      Description
  * -------------------------------------------------------------------
  * int32_t        return        0: OK
- *                             -1: error
+ *                              1200-12004,12100: error/warning
  */
 int32_t WebRtcAecm_BufferFarend(void* aecmInst,
                                 const int16_t* farend,
                                 size_t nrOfSamples);
 
+/*
+ * Reports any errors that would arise when buffering a farend buffer.
+ *
+ * Inputs                       Description
+ * -------------------------------------------------------------------
+ * void*          aecmInst      Pointer to the AECM instance
+ * int16_t*       farend        In buffer containing one frame of
+ *                              farend signal
+ * int16_t        nrOfSamples   Number of samples in farend buffer
+ *
+ * Outputs                      Description
+ * -------------------------------------------------------------------
+ * int32_t        return        0: OK
+ *                              1200-12004,12100: error/warning
+ */
+int32_t WebRtcAecm_GetBufferFarendError(void* aecmInst,
+                                        const int16_t* farend,
+                                        size_t nrOfSamples);
+
 /*
  * Runs the AECM on an 80 or 160 sample blocks of data.
  *
@@ -112,7 +131,7 @@ int32_t WebRtcAecm_BufferFarend(void* aecmInst,
  * -------------------------------------------------------------------
  * int16_t*       out            Out buffer, one frame of processed nearend
  * int32_t        return         0: OK
- *                              -1: error
+ *                               1200-12004,12100: error/warning
  */
 int32_t WebRtcAecm_Process(void* aecmInst,
                            const int16_t* nearendNoisy,
@@ -133,26 +152,10 @@ int32_t WebRtcAecm_Process(void* aecmInst,
  * Outputs                      Description
  * -------------------------------------------------------------------
  * int32_t        return        0: OK
- *                             -1: error
+ *                              1200-12004,12100: error/warning
  */
 int32_t WebRtcAecm_set_config(void* aecmInst, AecmConfig config);
 
-/*
- * This function enables the user to set certain parameters on-the-fly
- *
- * Inputs                       Description
- * -------------------------------------------------------------------
- * void*          aecmInst      Pointer to the AECM instance
- *
- * Outputs                      Description
- * -------------------------------------------------------------------
- * AecmConfig*    config        Pointer to the config instance that
- *                              all properties will be written to
- * int32_t        return        0: OK
- *                             -1: error
- */
-int32_t WebRtcAecm_get_config(void *aecmInst, AecmConfig *config);
-
 /*
  * This function enables the user to set the echo path on-the-fly.
  *
@@ -165,7 +168,7 @@ int32_t WebRtcAecm_get_config(void *aecmInst, AecmConfig *config);
  * Outputs                      Description
  * -------------------------------------------------------------------
  * int32_t      return          0: OK
- *                             -1: error
+ *                              1200-12004,12100: error/warning
  */
 int32_t WebRtcAecm_InitEchoPath(void* aecmInst,
                                 const void* echo_path,
@@ -184,7 +187,7 @@ int32_t WebRtcAecm_InitEchoPath(void* aecmInst,
  * Outputs                      Description
  * -------------------------------------------------------------------
  * int32_t      return          0: OK
- *                             -1: error
+ *                              1200-12004,12100: error/warning
  */
 int32_t WebRtcAecm_GetEchoPath(void* aecmInst,
                                void* echo_path,
@@ -199,18 +202,6 @@ int32_t WebRtcAecm_GetEchoPath(void* aecmInst,
  */
 size_t WebRtcAecm_echo_path_size_bytes();
 
-/*
- * Gets the last error code.
- *
- * Inputs                       Description
- * -------------------------------------------------------------------
- * void*          aecmInst      Pointer to the AECM instance
- *
- * Outputs                      Description
- * -------------------------------------------------------------------
- * int32_t        return        11000-11100: error code
- */
-int32_t WebRtcAecm_get_error_code(void *aecmInst);
 
 #ifdef __cplusplus
 }
diff --git a/webrtc/modules/audio_processing/echo_cancellation_impl.cc b/webrtc/modules/audio_processing/echo_cancellation_impl.cc
index 56ee9e0fff..0de5e620ce 100644
--- a/webrtc/modules/audio_processing/echo_cancellation_impl.cc
+++ b/webrtc/modules/audio_processing/echo_cancellation_impl.cc
@@ -94,7 +94,7 @@ int EchoCancellationImpl::ProcessRenderAudio(const AudioBuffer* audio) {
           audio->num_frames_per_band());
 
       if (err != apm_->kNoError) {
-        return GetHandleError(my_handle);  // TODO(ajm): warning possible?
+        return MapError(err);  // TODO(ajm): warning possible?
       }
 
       handle_index++;
@@ -138,7 +138,7 @@ int EchoCancellationImpl::ProcessCaptureAudio(AudioBuffer* audio) {
           stream_drift_samples_);
 
       if (err != apm_->kNoError) {
-        err = GetHandleError(my_handle);
+        err = MapError(err);
         // TODO(ajm): Figure out how to return warnings properly.
         if (err != apm_->kBadStreamParameterWarning) {
           return err;
@@ -148,7 +148,7 @@ int EchoCancellationImpl::ProcessCaptureAudio(AudioBuffer* audio) {
       int status = 0;
       err = WebRtcAec_get_echo_status(my_handle, &status);
       if (err != apm_->kNoError) {
-        return GetHandleError(my_handle);
+        return MapError(err);
       }
 
       if (status == 1) {
@@ -240,7 +240,7 @@ int EchoCancellationImpl::GetMetrics(Metrics* metrics) {
   Handle* my_handle = static_cast<Handle*>(handle(0));
   int err = WebRtcAec_GetMetrics(my_handle, &my_metrics);
   if (err != apm_->kNoError) {
-    return GetHandleError(my_handle);
+    return MapError(err);
   }
 
   metrics->residual_echo_return_loss.instant = my_metrics.rerl.instant;
@@ -309,9 +309,10 @@ int EchoCancellationImpl::GetDelayMetrics(int* median, int* std,
   }
 
   Handle* my_handle = static_cast<Handle*>(handle(0));
-  if (WebRtcAec_GetDelayMetrics(my_handle, median, std, fraction_poor_delays) !=
-      apm_->kNoError) {
-    return GetHandleError(my_handle);
+  const int err =
+      WebRtcAec_GetDelayMetrics(my_handle, median, std, fraction_poor_delays);
+  if (err != apm_->kNoError) {
+    return MapError(err);
   }
 
   return apm_->kNoError;
@@ -384,6 +385,6 @@ int EchoCancellationImpl::num_handles_required() const {
 
 int EchoCancellationImpl::GetHandleError(void* handle) const {
   assert(handle != NULL);
-  return MapError(WebRtcAec_get_error_code(static_cast<Handle*>(handle)));
+  return AudioProcessing::kUnspecifiedError;
 }
 }  // namespace webrtc
diff --git a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
index 954aac7d4a..7466d006d8 100644
--- a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
+++ b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
@@ -40,22 +40,6 @@ int16_t MapSetting(EchoControlMobile::RoutingMode mode) {
   return -1;
 }
 
-AudioProcessing::Error MapError(int err) {
-  switch (err) {
-    case AECM_UNSUPPORTED_FUNCTION_ERROR:
-      return AudioProcessing::kUnsupportedFunctionError;
-    case AECM_NULL_POINTER_ERROR:
-      return AudioProcessing::kNullPointerError;
-    case AECM_BAD_PARAMETER_ERROR:
-      return AudioProcessing::kBadParameterError;
-    case AECM_BAD_PARAMETER_WARNING:
-      return AudioProcessing::kBadStreamParameterWarning;
-    default:
-      // AECM_UNSPECIFIED_ERROR
-      // AECM_UNINITIALIZED_ERROR
-      return AudioProcessing::kUnspecifiedError;
-  }
-}
 }  // namespace
 
 size_t EchoControlMobile::echo_path_size_bytes() {
@@ -289,6 +273,6 @@ int EchoControlMobileImpl::num_handles_required() const {
 
 int EchoControlMobileImpl::GetHandleError(void* handle) const {
   assert(handle != NULL);
-  return MapError(WebRtcAecm_get_error_code(static_cast<Handle*>(handle)));
+  return AudioProcessing::kUnspecifiedError;
 }
 }  // namespace webrtc