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130 lines
3.2 KiB
C
130 lines
3.2 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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#include "webrtc/common_audio/vad/include/webrtc_vad.h"
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#include <stdlib.h>
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#include <string.h>
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#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
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#include "webrtc/common_audio/vad/vad_core.h"
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#include "webrtc/typedefs.h"
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static const int kInitCheck = 42;
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static const int kValidRates[] = { 8000, 16000, 32000, 48000 };
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static const size_t kRatesSize = sizeof(kValidRates) / sizeof(*kValidRates);
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static const int kMaxFrameLengthMs = 30;
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int WebRtcVad_Create(VadInst** handle) {
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VadInstT* self = NULL;
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if (handle == NULL) {
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return -1;
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}
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*handle = NULL;
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self = (VadInstT*) malloc(sizeof(VadInstT));
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*handle = (VadInst*) self;
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if (self == NULL) {
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return -1;
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}
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WebRtcSpl_Init();
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self->init_flag = 0;
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return 0;
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}
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void WebRtcVad_Free(VadInst* handle) {
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free(handle);
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}
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// TODO(bjornv): Move WebRtcVad_InitCore() code here.
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int WebRtcVad_Init(VadInst* handle) {
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// Initialize the core VAD component.
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return WebRtcVad_InitCore((VadInstT*) handle);
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}
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// TODO(bjornv): Move WebRtcVad_set_mode_core() code here.
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int WebRtcVad_set_mode(VadInst* handle, int mode) {
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VadInstT* self = (VadInstT*) handle;
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if (handle == NULL) {
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return -1;
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}
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if (self->init_flag != kInitCheck) {
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return -1;
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}
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return WebRtcVad_set_mode_core(self, mode);
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}
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int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
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int frame_length) {
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int vad = -1;
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VadInstT* self = (VadInstT*) handle;
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if (handle == NULL) {
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return -1;
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}
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if (self->init_flag != kInitCheck) {
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return -1;
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}
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if (audio_frame == NULL) {
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return -1;
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}
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if (WebRtcVad_ValidRateAndFrameLength(fs, frame_length) != 0) {
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return -1;
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}
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if (fs == 48000) {
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vad = WebRtcVad_CalcVad48khz(self, audio_frame, frame_length);
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} else if (fs == 32000) {
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vad = WebRtcVad_CalcVad32khz(self, audio_frame, frame_length);
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} else if (fs == 16000) {
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vad = WebRtcVad_CalcVad16khz(self, audio_frame, frame_length);
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} else if (fs == 8000) {
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vad = WebRtcVad_CalcVad8khz(self, audio_frame, frame_length);
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}
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if (vad > 0) {
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vad = 1;
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}
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return vad;
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}
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int WebRtcVad_ValidRateAndFrameLength(int rate, int frame_length) {
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int return_value = -1;
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size_t i;
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int valid_length_ms;
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int valid_length;
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// We only allow 10, 20 or 30 ms frames. Loop through valid frame rates and
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// see if we have a matching pair.
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for (i = 0; i < kRatesSize; i++) {
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if (kValidRates[i] == rate) {
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for (valid_length_ms = 10; valid_length_ms <= kMaxFrameLengthMs;
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valid_length_ms += 10) {
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valid_length = (kValidRates[i] / 1000 * valid_length_ms);
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if (frame_length == valid_length) {
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return_value = 0;
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break;
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}
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}
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break;
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}
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}
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return return_value;
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}
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