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257 lines
8.7 KiB
C
257 lines
8.7 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 WEBRTC_MODULES_AUDIO_PROCESSING_AEC_INCLUDE_ECHO_CANCELLATION_H_
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#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_INCLUDE_ECHO_CANCELLATION_H_
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#include "webrtc/typedefs.h"
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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 {
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kAecNlpConservative = 0,
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kAecNlpModerate,
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kAecNlpAggressive
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};
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enum {
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kAecFalse = 0,
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kAecTrue
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};
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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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} AecMetrics;
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struct AecCore;
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#ifdef __cplusplus
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extern "C" {
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#endif
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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.
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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 to be created
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* and initialized
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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_Create(void** aecInst);
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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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* 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_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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* -1: error
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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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int16_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* nearend In buffer containing one frame of
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* nearend+echo signal for L band
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* float* nearendH In buffer containing one frame of
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* nearend+echo signal for H band
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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* out Out buffer, one frame of processed nearend
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* for L band
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* float* outH Out buffer, one frame of processed nearend
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* for H band
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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_Process(void* aecInst,
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const float* nearend,
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const float* nearendH,
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float* out,
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float* outH,
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int16_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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* -1: error
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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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* -1: error
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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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* -1: error
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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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*
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* int return 0: OK
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* -1: error
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*/
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int WebRtcAec_GetDelayMetrics(void* handle, int* median, int* std);
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/*
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* Gets the last error code.
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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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* Outputs Description
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* -------------------------------------------------------------------
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* int32_t return 11000-11100: error code
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*/
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int32_t WebRtcAec_get_error_code(void* aecInst);
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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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#ifdef __cplusplus
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}
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#endif
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#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_INCLUDE_ECHO_CANCELLATION_H_
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