mirror of
https://github.com/danog/libtgvoip.git
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5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
299 lines
9.7 KiB
C++
299 lines
9.7 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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#ifndef MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_H_
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#define MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_H_
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#include <memory>
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#include <stddef.h>
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extern "C" {
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#include "common_audio/ring_buffer.h"
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}
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#include "modules/audio_processing/aec/aec_core.h"
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namespace webrtc {
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// Errors
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#define AEC_UNSPECIFIED_ERROR 12000
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#define AEC_UNSUPPORTED_FUNCTION_ERROR 12001
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#define AEC_UNINITIALIZED_ERROR 12002
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#define AEC_NULL_POINTER_ERROR 12003
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#define AEC_BAD_PARAMETER_ERROR 12004
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// Warnings
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#define AEC_BAD_PARAMETER_WARNING 12050
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enum { kAecNlpConservative = 0, kAecNlpModerate, kAecNlpAggressive };
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enum { kAecFalse = 0, kAecTrue };
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typedef struct {
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int16_t nlpMode; // default kAecNlpModerate
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int16_t skewMode; // default kAecFalse
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int16_t metricsMode; // default kAecFalse
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int delay_logging; // default kAecFalse
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// float realSkew;
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} AecConfig;
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typedef struct {
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int instant;
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int average;
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int max;
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int min;
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} AecLevel;
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typedef struct {
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AecLevel rerl;
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AecLevel erl;
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AecLevel erle;
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AecLevel aNlp;
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float divergent_filter_fraction;
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} AecMetrics;
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struct AecCore;
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class ApmDataDumper;
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typedef struct Aec {
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Aec();
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~Aec();
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std::unique_ptr<ApmDataDumper> data_dumper;
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int delayCtr;
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int sampFreq;
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int splitSampFreq;
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int scSampFreq;
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float sampFactor; // scSampRate / sampFreq
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short skewMode;
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int bufSizeStart;
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int knownDelay;
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int rate_factor;
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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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int 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; // Filtered delay estimate.
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int timeForDelayChange;
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int startup_phase;
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int checkBuffSize;
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short lastDelayDiff;
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// Structures
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void* resampler;
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int skewFrCtr;
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int resample; // if the skew is small enough we don't resample
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int highSkewCtr;
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float skew;
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RingBuffer* far_pre_buf; // Time domain far-end pre-buffer.
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int farend_started;
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// Aec instance counter.
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static int instance_count;
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AecCore* aec;
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} Aec;
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/*
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* Allocates the memory needed by the AEC. The memory needs to be initialized
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* separately using the WebRtcAec_Init() function. Returns a pointer to the
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* object or NULL on error.
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*/
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void* WebRtcAec_Create();
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/*
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* This function releases the memory allocated by WebRtcAec_Create().
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* aecInst Pointer to the AEC instance
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*/
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void WebRtcAec_Free(void* aecInst);
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/*
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* Initializes an AEC instance.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* aecInst Pointer to the AEC instance
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* int32_t sampFreq Sampling frequency of data
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* int32_t scSampFreq Soundcard sampling frequency
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* int32_t return 0: OK
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* -1: error
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*/
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int32_t WebRtcAec_Init(void* aecInst, int32_t sampFreq, int32_t scSampFreq);
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/*
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* Inserts an 80 or 160 sample block of data into the farend buffer.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* aecInst Pointer to the AEC instance
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* const float* farend In buffer containing one frame of
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* farend signal for L band
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* int16_t nrOfSamples Number of samples in farend buffer
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* int32_t return 0: OK
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* 12000-12050: error code
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*/
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int32_t WebRtcAec_BufferFarend(void* aecInst,
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const float* farend,
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size_t nrOfSamples);
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/*
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* Reports any errors that would arise if buffering a farend buffer
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* aecInst Pointer to the AEC instance
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* const float* farend In buffer containing one frame of
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* farend signal for L band
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* int16_t nrOfSamples Number of samples in farend buffer
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* int32_t return 0: OK
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* 12000-12050: error code
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*/
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int32_t WebRtcAec_GetBufferFarendError(void* aecInst,
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const float* farend,
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size_t nrOfSamples);
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/*
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* Runs the echo canceller on an 80 or 160 sample blocks of data.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* aecInst Pointer to the AEC instance
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* float* const* nearend In buffer containing one frame of
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* nearend+echo signal for each band
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* int num_bands Number of bands in nearend buffer
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* int16_t nrOfSamples Number of samples in nearend buffer
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* int16_t msInSndCardBuf Delay estimate for sound card and
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* system buffers
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* int16_t skew Difference between number of samples played
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* and recorded at the soundcard (for clock skew
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* compensation)
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* float* const* out Out buffer, one frame of processed nearend
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* for each band
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* int32_t return 0: OK
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* 12000-12050: error code
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*/
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int32_t WebRtcAec_Process(void* aecInst,
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const float* const* nearend,
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size_t num_bands,
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float* const* out,
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size_t nrOfSamples,
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int16_t msInSndCardBuf,
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int32_t skew);
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/*
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* This function enables the user to set certain parameters on-the-fly.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* handle Pointer to the AEC instance
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* AecConfig config Config instance that contains all
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* properties to be set
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* int return 0: OK
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* 12000-12050: error code
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*/
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int WebRtcAec_set_config(void* handle, AecConfig config);
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/*
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* Gets the current echo status of the nearend signal.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* handle Pointer to the AEC instance
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* int* status 0: Almost certainly nearend single-talk
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* 1: Might not be neared single-talk
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* int return 0: OK
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* 12000-12050: error code
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*/
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int WebRtcAec_get_echo_status(void* handle, int* status);
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/*
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* Gets the current echo metrics for the session.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* handle Pointer to the AEC instance
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* AecMetrics* metrics Struct which will be filled out with the
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* current echo metrics.
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* int return 0: OK
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* 12000-12050: error code
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*/
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int WebRtcAec_GetMetrics(void* handle, AecMetrics* metrics);
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/*
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* Gets the current delay metrics for the session.
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*
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* Inputs Description
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* -------------------------------------------------------------------
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* void* handle Pointer to the AEC instance
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*
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* Outputs Description
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* -------------------------------------------------------------------
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* int* median Delay median value.
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* int* std Delay standard deviation.
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* float* fraction_poor_delays Fraction of the delay estimates that may
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* cause the AEC to perform poorly.
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*
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* int return 0: OK
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* 12000-12050: error code
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*/
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int WebRtcAec_GetDelayMetrics(void* handle,
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int* median,
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int* std,
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float* fraction_poor_delays);
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// Returns a pointer to the low level AEC handle.
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//
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// Input:
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// - handle : Pointer to the AEC instance.
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//
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// Return value:
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// - AecCore pointer : NULL for error.
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//
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struct AecCore* WebRtcAec_aec_core(void* handle);
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_H_
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