87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
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/*
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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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/*
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* This header file includes the VAD API calls. Specific function calls are given below.
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*/
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#ifndef WEBRTC_COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_ // NOLINT
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#define WEBRTC_COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_
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#include <stddef.h>
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#include "webrtc/typedefs.h"
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typedef struct WebRtcVadInst VadInst;
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Creates an instance to the VAD structure.
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VadInst* WebRtcVad_Create();
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// Frees the dynamic memory of a specified VAD instance.
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//
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// - handle [i] : Pointer to VAD instance that should be freed.
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void WebRtcVad_Free(VadInst* handle);
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// Initializes a VAD instance.
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//
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// - handle [i/o] : Instance that should be initialized.
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//
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// returns : 0 - (OK),
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// -1 - (NULL pointer or Default mode could not be set).
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int WebRtcVad_Init(VadInst* handle);
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// Sets the VAD operating mode. A more aggressive (higher mode) VAD is more
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// restrictive in reporting speech. Put in other words the probability of being
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// speech when the VAD returns 1 is increased with increasing mode. As a
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// consequence also the missed detection rate goes up.
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//
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// - handle [i/o] : VAD instance.
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// - mode [i] : Aggressiveness mode (0, 1, 2, or 3).
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//
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// returns : 0 - (OK),
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// -1 - (NULL pointer, mode could not be set or the VAD instance
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// has not been initialized).
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int WebRtcVad_set_mode(VadInst* handle, int mode);
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// Calculates a VAD decision for the |audio_frame|. For valid sampling rates
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// frame lengths, see the description of WebRtcVad_ValidRatesAndFrameLengths().
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//
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// - handle [i/o] : VAD Instance. Needs to be initialized by
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// WebRtcVad_Init() before call.
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// - fs [i] : Sampling frequency (Hz): 8000, 16000, or 32000
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// - audio_frame [i] : Audio frame buffer.
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// - frame_length [i] : Length of audio frame buffer in number of samples.
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//
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// returns : 1 - (Active Voice),
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// 0 - (Non-active Voice),
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// -1 - (Error)
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int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
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size_t frame_length);
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// Checks for valid combinations of |rate| and |frame_length|. We support 10,
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// 20 and 30 ms frames and the rates 8000, 16000 and 32000 Hz.
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//
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// - rate [i] : Sampling frequency (Hz).
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// - frame_length [i] : Speech frame buffer length in number of samples.
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//
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// returns : 0 - (valid combination), -1 - (invalid combination)
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int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length);
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#ifdef __cplusplus
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}
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#endif
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#endif // WEBRTC_COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_ // NOLINT
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