| /* |
| * 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. |
| */ |
| |
| |
| /* |
| * This header file includes the descriptions of the core VAD calls. |
| */ |
| |
| #ifndef WEBRTC_COMMON_AUDIO_VAD_VAD_CORE_H_ |
| #define WEBRTC_COMMON_AUDIO_VAD_VAD_CORE_H_ |
| |
| #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" |
| #include "webrtc/typedefs.h" |
| |
| enum { kNumChannels = 6 }; // Number of frequency bands (named channels). |
| enum { kNumGaussians = 2 }; // Number of Gaussians per channel in the GMM. |
| enum { kTableSize = kNumChannels * kNumGaussians }; |
| enum { kMinEnergy = 10 }; // Minimum energy required to trigger audio signal. |
| |
| typedef struct VadInstT_ |
| { |
| |
| int vad; |
| int32_t downsampling_filter_states[4]; |
| WebRtcSpl_State48khzTo8khz state_48_to_8; |
| int16_t noise_means[kTableSize]; |
| int16_t speech_means[kTableSize]; |
| int16_t noise_stds[kTableSize]; |
| int16_t speech_stds[kTableSize]; |
| // TODO(bjornv): Change to |frame_count|. |
| int32_t frame_counter; |
| int16_t over_hang; // Over Hang |
| int16_t num_of_speech; |
| // TODO(bjornv): Change to |age_vector|. |
| int16_t index_vector[16 * kNumChannels]; |
| int16_t low_value_vector[16 * kNumChannels]; |
| // TODO(bjornv): Change to |median|. |
| int16_t mean_value[kNumChannels]; |
| int16_t upper_state[5]; |
| int16_t lower_state[5]; |
| int16_t hp_filter_state[4]; |
| int16_t over_hang_max_1[3]; |
| int16_t over_hang_max_2[3]; |
| int16_t individual[3]; |
| int16_t total[3]; |
| |
| int init_flag; |
| |
| } VadInstT; |
| |
| // Initializes the core VAD component. The default aggressiveness mode is |
| // controlled by |kDefaultMode| in vad_core.c. |
| // |
| // - self [i/o] : Instance that should be initialized |
| // |
| // returns : 0 (OK), -1 (NULL pointer in or if the default mode can't be |
| // set) |
| int WebRtcVad_InitCore(VadInstT* self); |
| |
| /**************************************************************************** |
| * WebRtcVad_set_mode_core(...) |
| * |
| * This function changes the VAD settings |
| * |
| * Input: |
| * - inst : VAD instance |
| * - mode : Aggressiveness degree |
| * 0 (High quality) - 3 (Highly aggressive) |
| * |
| * Output: |
| * - inst : Changed instance |
| * |
| * Return value : 0 - Ok |
| * -1 - Error |
| */ |
| |
| int WebRtcVad_set_mode_core(VadInstT* self, int mode); |
| |
| /**************************************************************************** |
| * WebRtcVad_CalcVad48khz(...) |
| * WebRtcVad_CalcVad32khz(...) |
| * WebRtcVad_CalcVad16khz(...) |
| * WebRtcVad_CalcVad8khz(...) |
| * |
| * Calculate probability for active speech and make VAD decision. |
| * |
| * Input: |
| * - inst : Instance that should be initialized |
| * - speech_frame : Input speech frame |
| * - frame_length : Number of input samples |
| * |
| * Output: |
| * - inst : Updated filter states etc. |
| * |
| * Return value : VAD decision |
| * 0 - No active speech |
| * 1-6 - Active speech |
| */ |
| int WebRtcVad_CalcVad48khz(VadInstT* inst, const int16_t* speech_frame, |
| size_t frame_length); |
| int WebRtcVad_CalcVad32khz(VadInstT* inst, const int16_t* speech_frame, |
| size_t frame_length); |
| int WebRtcVad_CalcVad16khz(VadInstT* inst, const int16_t* speech_frame, |
| size_t frame_length); |
| int WebRtcVad_CalcVad8khz(VadInstT* inst, const int16_t* speech_frame, |
| size_t frame_length); |
| |
| #endif // WEBRTC_COMMON_AUDIO_VAD_VAD_CORE_H_ |