1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_INTERNAL_H_ 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_INTERNAL_H_ 13 14 #include "webrtc/modules/audio_processing/aec/aec_core.h" 15 #include "webrtc/modules/audio_processing/utility/ring_buffer.h" 16 17 typedef struct { 18 int delayCtr; 19 int sampFreq; 20 int splitSampFreq; 21 int scSampFreq; 22 float sampFactor; // scSampRate / sampFreq 23 short skewMode; 24 int bufSizeStart; 25 int knownDelay; 26 int rate_factor; 27 28 short initFlag; // indicates if AEC has been initialized 29 30 // Variables used for averaging far end buffer size 31 short counter; 32 int sum; 33 short firstVal; 34 short checkBufSizeCtr; 35 36 // Variables used for delay shifts 37 short msInSndCardBuf; 38 short filtDelay; // Filtered delay estimate. 39 int timeForDelayChange; 40 int startup_phase; 41 int checkBuffSize; 42 short lastDelayDiff; 43 44 #ifdef WEBRTC_AEC_DEBUG_DUMP 45 RingBuffer* far_pre_buf_s16; // Time domain far-end pre-buffer in int16_t. 46 FILE* bufFile; 47 FILE* delayFile; 48 FILE* skewFile; 49 #endif 50 51 // Structures 52 void* resampler; 53 54 int skewFrCtr; 55 int resample; // if the skew is small enough we don't resample 56 int highSkewCtr; 57 float skew; 58 59 RingBuffer* far_pre_buf; // Time domain far-end pre-buffer. 60 61 int lastError; 62 63 int farend_started; 64 65 AecCore* aec; 66 } aecpc_t; 67 68 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_INTERNAL_H_ 69