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Diffstat (limited to 'src/modules/audio_processing/aec/aec_core.h')
| -rw-r--r-- | src/modules/audio_processing/aec/aec_core.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/modules/audio_processing/aec/aec_core.h b/src/modules/audio_processing/aec/aec_core.h new file mode 100644 index 0000000000..1b9828ab17 --- /dev/null +++ b/src/modules/audio_processing/aec/aec_core.h @@ -0,0 +1,179 @@ +/* + * Copyright (c) 2011 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. + */ + +/* + * Specifies the interface for the AEC core. + */ + +#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_CORE_H_ +#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_CORE_H_ + +#include <stdio.h> + +#include "signal_processing_library.h" +#include "typedefs.h" + +#define FRAME_LEN 80 +#define PART_LEN 64 // Length of partition +#define PART_LEN1 (PART_LEN + 1) // Unique fft coefficients +#define PART_LEN2 (PART_LEN * 2) // Length of partition * 2 +#define NR_PART 12 // Number of partitions in filter. +#define PREF_BAND_SIZE 24 + +// Delay estimator constants, used for logging. +enum { kMaxDelayBlocks = 60 }; +enum { kLookaheadBlocks = 15 }; +enum { kHistorySizeBlocks = kMaxDelayBlocks + kLookaheadBlocks }; + +typedef float complex_t[2]; +// For performance reasons, some arrays of complex numbers are replaced by twice +// as long arrays of float, all the real parts followed by all the imaginary +// ones (complex_t[SIZE] -> float[2][SIZE]). This allows SIMD optimizations and +// is better than two arrays (one for the real parts and one for the imaginary +// parts) as this other way would require two pointers instead of one and cause +// extra register spilling. This also allows the offsets to be calculated at +// compile time. + +// Metrics +enum {offsetLevel = -100}; + +typedef struct { + float sfrsum; + int sfrcounter; + float framelevel; + float frsum; + int frcounter; + float minlevel; + float averagelevel; +} power_level_t; + +typedef struct { + float instant; + float average; + float min; + float max; + float sum; + float hisum; + float himean; + int counter; + int hicounter; +} stats_t; + +typedef struct { + int farBufWritePos, farBufReadPos; + + int knownDelay; + int inSamples, outSamples; + int delayEstCtr; + + void *nearFrBuf, *outFrBuf; + + void *nearFrBufH; + void *outFrBufH; + + float dBuf[PART_LEN2]; // nearend + float eBuf[PART_LEN2]; // error + + float dBufH[PART_LEN2]; // nearend + + float xPow[PART_LEN1]; + float dPow[PART_LEN1]; + float dMinPow[PART_LEN1]; + float dInitMinPow[PART_LEN1]; + float *noisePow; + + float xfBuf[2][NR_PART * PART_LEN1]; // farend fft buffer + float wfBuf[2][NR_PART * PART_LEN1]; // filter fft + complex_t sde[PART_LEN1]; // cross-psd of nearend and error + complex_t sxd[PART_LEN1]; // cross-psd of farend and nearend + complex_t xfwBuf[NR_PART * PART_LEN1]; // farend windowed fft buffer + + float sx[PART_LEN1], sd[PART_LEN1], se[PART_LEN1]; // far, near and error psd + float hNs[PART_LEN1]; + float hNlFbMin, hNlFbLocalMin; + float hNlXdAvgMin; + int hNlNewMin, hNlMinCtr; + float overDrive, overDriveSm; + float targetSupp, minOverDrive; + float outBuf[PART_LEN]; + int delayIdx; + + short stNearState, echoState; + short divergeState; + + int xfBufBlockPos; + + void* far_buf; + void* far_buf_windowed; + int system_delay; // Current system delay buffered in AEC. + + int mult; // sampling frequency multiple + int sampFreq; + WebRtc_UWord32 seed; + + float mu; // stepsize + float errThresh; // error threshold + + int noiseEstCtr; + + power_level_t farlevel; + power_level_t nearlevel; + power_level_t linoutlevel; + power_level_t nlpoutlevel; + + int metricsMode; + int stateCounter; + stats_t erl; + stats_t erle; + stats_t aNlp; + stats_t rerl; + + // Quantities to control H band scaling for SWB input + int freq_avg_ic; //initial bin for averaging nlp gain + int flag_Hband_cn; //for comfort noise + float cn_scale_Hband; //scale for comfort noise in H band + + int delay_histogram[kHistorySizeBlocks]; + int delay_logging_enabled; + void* delay_estimator; + +#ifdef WEBRTC_AEC_DEBUG_DUMP + void* far_time_buf; + FILE *farFile; + FILE *nearFile; + FILE *outFile; + FILE *outLinearFile; +#endif +} aec_t; + +typedef void (*WebRtcAec_FilterFar_t)(aec_t *aec, float yf[2][PART_LEN1]); +extern WebRtcAec_FilterFar_t WebRtcAec_FilterFar; +typedef void (*WebRtcAec_ScaleErrorSignal_t)(aec_t *aec, float ef[2][PART_LEN1]); +extern WebRtcAec_ScaleErrorSignal_t WebRtcAec_ScaleErrorSignal; +typedef void (*WebRtcAec_FilterAdaptation_t) + (aec_t *aec, float *fft, float ef[2][PART_LEN1]); +extern WebRtcAec_FilterAdaptation_t WebRtcAec_FilterAdaptation; +typedef void (*WebRtcAec_OverdriveAndSuppress_t) + (aec_t *aec, float hNl[PART_LEN1], const float hNlFb, float efw[2][PART_LEN1]); +extern WebRtcAec_OverdriveAndSuppress_t WebRtcAec_OverdriveAndSuppress; + +int WebRtcAec_CreateAec(aec_t **aec); +int WebRtcAec_FreeAec(aec_t *aec); +int WebRtcAec_InitAec(aec_t *aec, int sampFreq); +void WebRtcAec_InitAec_SSE2(void); + +void WebRtcAec_InitMetrics(aec_t *aec); +void WebRtcAec_BufferFarendPartition(aec_t *aec, const float* farend); +void WebRtcAec_ProcessFrame(aec_t* aec, + const short *nearend, + const short *nearendH, + int knownDelay); + +#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_CORE_H_ |