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Diffstat (limited to 'third_party/libwebrtc/common_audio/vad/vad_core.h')
| -rw-r--r-- | third_party/libwebrtc/common_audio/vad/vad_core.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_audio/vad/vad_core.h b/third_party/libwebrtc/common_audio/vad/vad_core.h new file mode 100644 index 0000000000..fbaf970065 --- /dev/null +++ b/third_party/libwebrtc/common_audio/vad/vad_core.h @@ -0,0 +1,123 @@ +/* + * 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 COMMON_AUDIO_VAD_VAD_CORE_H_ +#define COMMON_AUDIO_VAD_VAD_CORE_H_ + +#include "common_audio/signal_processing/include/signal_processing_library.h" + +// TODO(https://bugs.webrtc.org/14476): When converted to C++, remove the macro. +#if defined(__cplusplus) +#define CONSTEXPR_INT(x) constexpr int x +#else +#define CONSTEXPR_INT(x) enum { x } +#endif + +CONSTEXPR_INT(kNumChannels = 6); // Number of frequency bands (named channels). +CONSTEXPR_INT( + kNumGaussians = 2); // Number of Gaussians per channel in the GMM. +CONSTEXPR_INT(kTableSize = kNumChannels * kNumGaussians); +CONSTEXPR_INT( + 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 // COMMON_AUDIO_VAD_VAD_CORE_H_ |