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+/*
+ * Copyright (c) 2012 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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_INCLUDE_ECHO_CANCELLATION_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_INCLUDE_ECHO_CANCELLATION_H_
+
+#include "webrtc/typedefs.h"
+
+// Errors
+#define AEC_UNSPECIFIED_ERROR 12000
+#define AEC_UNSUPPORTED_FUNCTION_ERROR 12001
+#define AEC_UNINITIALIZED_ERROR 12002
+#define AEC_NULL_POINTER_ERROR 12003
+#define AEC_BAD_PARAMETER_ERROR 12004
+
+// Warnings
+#define AEC_BAD_PARAMETER_WARNING 12050
+
+enum {
+ kAecNlpConservative = 0,
+ kAecNlpModerate,
+ kAecNlpAggressive
+};
+
+enum {
+ kAecFalse = 0,
+ kAecTrue
+};
+
+typedef struct {
+ int16_t nlpMode; // default kAecNlpModerate
+ int16_t skewMode; // default kAecFalse
+ int16_t metricsMode; // default kAecFalse
+ int delay_logging; // default kAecFalse
+ // float realSkew;
+} AecConfig;
+
+typedef struct {
+ int instant;
+ int average;
+ int max;
+ int min;
+} AecLevel;
+
+typedef struct {
+ AecLevel rerl;
+ AecLevel erl;
+ AecLevel erle;
+ AecLevel aNlp;
+} AecMetrics;
+
+struct AecCore;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Allocates the memory needed by the AEC. The memory needs to be initialized
+ * separately using the WebRtcAec_Init() function.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void** aecInst Pointer to the AEC instance to be created
+ * and initialized
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * int32_t return 0: OK
+ * -1: error
+ */
+int32_t WebRtcAec_Create(void** aecInst);
+
+/*
+ * This function releases the memory allocated by WebRtcAec_Create().
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* aecInst Pointer to the AEC instance
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * int32_t return 0: OK
+ * -1: error
+ */
+int32_t WebRtcAec_Free(void* aecInst);
+
+/*
+ * Initializes an AEC instance.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* aecInst Pointer to the AEC instance
+ * int32_t sampFreq Sampling frequency of data
+ * int32_t scSampFreq Soundcard sampling frequency
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * int32_t return 0: OK
+ * -1: error
+ */
+int32_t WebRtcAec_Init(void* aecInst, int32_t sampFreq, int32_t scSampFreq);
+
+/*
+ * Inserts an 80 or 160 sample block of data into the farend buffer.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* aecInst Pointer to the AEC instance
+ * int16_t* 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
+ * -1: error
+ */
+int32_t WebRtcAec_BufferFarend(void* aecInst,
+ const int16_t* farend,
+ int16_t nrOfSamples);
+
+/*
+ * Runs the echo canceller on an 80 or 160 sample blocks of data.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* aecInst Pointer to the AEC instance
+ * float* nearend In buffer containing one frame of
+ * nearend+echo signal for L band
+ * float* nearendH In buffer containing one frame of
+ * nearend+echo signal for H band
+ * int16_t nrOfSamples Number of samples in nearend buffer
+ * int16_t msInSndCardBuf Delay estimate for sound card and
+ * system buffers
+ * int16_t skew Difference between number of samples played
+ * and recorded at the soundcard (for clock skew
+ * compensation)
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * float* out Out buffer, one frame of processed nearend
+ * for L band
+ * float* outH Out buffer, one frame of processed nearend
+ * for H band
+ * int32_t return 0: OK
+ * -1: error
+ */
+int32_t WebRtcAec_Process(void* aecInst,
+ const float* nearend,
+ const float* nearendH,
+ float* out,
+ float* outH,
+ int16_t nrOfSamples,
+ int16_t msInSndCardBuf,
+ int32_t skew);
+
+/*
+ * This function enables the user to set certain parameters on-the-fly.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* handle Pointer to the AEC instance
+ * AecConfig config Config instance that contains all
+ * properties to be set
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * int return 0: OK
+ * -1: error
+ */
+int WebRtcAec_set_config(void* handle, AecConfig config);
+
+/*
+ * Gets the current echo status of the nearend signal.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* handle Pointer to the AEC instance
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * int* status 0: Almost certainly nearend single-talk
+ * 1: Might not be neared single-talk
+ * int return 0: OK
+ * -1: error
+ */
+int WebRtcAec_get_echo_status(void* handle, int* status);
+
+/*
+ * Gets the current echo metrics for the session.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* handle Pointer to the AEC instance
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * AecMetrics* metrics Struct which will be filled out with the
+ * current echo metrics.
+ * int return 0: OK
+ * -1: error
+ */
+int WebRtcAec_GetMetrics(void* handle, AecMetrics* metrics);
+
+/*
+ * Gets the current delay metrics for the session.
+ *
+ * Inputs Description
+ * -------------------------------------------------------------------
+ * void* handle Pointer to the AEC instance
+ *
+ * Outputs Description
+ * -------------------------------------------------------------------
+ * int* median Delay median value.
+ * int* std Delay standard deviation.
+ *
+ * int return 0: OK
+ * -1: error
+ */
+int WebRtcAec_GetDelayMetrics(void* handle, int* median, int* std);
+
+/*
+ * 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:
+// - handle : Pointer to the AEC instance.
+//
+// Return value:
+// - AecCore pointer : NULL for error.
+//
+struct AecCore* WebRtcAec_aec_core(void* handle);
+
+#ifdef __cplusplus
+}
+#endif
+#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_INCLUDE_ECHO_CANCELLATION_H_
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