trunk/src/common_audio/vad/webrtc_vad.c

/*
 *  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 file includes the VAD API calls. For a specific function call description,
 * see webrtc_vad.h
 */

#include <stdlib.h>
#include <string.h>

#include "webrtc_vad.h"
#include "vad_core.h"

static const int kInitCheck = 42;

WebRtc_Word16 WebRtcVad_AssignSize(int *size_in_bytes)
{
    *size_in_bytes = sizeof(VadInstT) * 2 / sizeof(WebRtc_Word16);
    return 0;
}

WebRtc_Word16 WebRtcVad_Assign(VadInst **vad_inst, void *vad_inst_addr)
{

    if (vad_inst == NULL)
    {
        return -1;
    }

    if (vad_inst_addr != NULL)
    {
        *vad_inst = (VadInst*)vad_inst_addr;
        return 0;
    } else
    {
        return -1;
    }
}

int WebRtcVad_Create(VadInst** handle) {
  VadInstT* self = NULL;

  if (handle == NULL) {
    return -1;
  }

  *handle = NULL;
  self = (VadInstT*) malloc(sizeof(VadInstT));
  *handle = (VadInst*) self;

  if (self == NULL) {
    return -1;
  }

  self->init_flag = 0;

  return 0;
}

int WebRtcVad_Free(VadInst* handle) {
  if (handle == NULL) {
    return -1;
  }

  free(handle);

  return 0;
}

int WebRtcVad_Init(VadInst* handle) {
  // Initialize the core VAD component.
  return WebRtcVad_InitCore((VadInstT*) handle);
}

int WebRtcVad_set_mode(VadInst *vad_inst, int mode)
{
    VadInstT* vad_ptr;

    if (vad_inst == NULL)
    {
        return -1;
    }

    vad_ptr = (VadInstT*)vad_inst;
    if (vad_ptr->init_flag != kInitCheck)
    {
        return -1;
    }

    return WebRtcVad_set_mode_core((VadInstT*)vad_inst, mode);
}

WebRtc_Word16 WebRtcVad_Process(VadInst *vad_inst,
                                WebRtc_Word16 fs,
                                WebRtc_Word16 *speech_frame,
                                WebRtc_Word16 frame_length)
{
    WebRtc_Word16 vad;
    VadInstT* vad_ptr;

    if (vad_inst == NULL)
    {
        return -1;
    }

    vad_ptr = (VadInstT*)vad_inst;
    if (vad_ptr->init_flag != kInitCheck)
    {
        return -1;
    }

    if (speech_frame == NULL)
    {
        return -1;
    }

    if (fs == 32000)
    {
        if ((frame_length != 320) && (frame_length != 640) && (frame_length != 960))
        {
            return -1;
        }
        vad = WebRtcVad_CalcVad32khz((VadInstT*)vad_inst, speech_frame, frame_length);

    } else if (fs == 16000)
    {
        if ((frame_length != 160) && (frame_length != 320) && (frame_length != 480))
        {
            return -1;
        }
        vad = WebRtcVad_CalcVad16khz((VadInstT*)vad_inst, speech_frame, frame_length);

    } else if (fs == 8000)
    {
        if ((frame_length != 80) && (frame_length != 160) && (frame_length != 240))
        {
            return -1;
        }
        vad = WebRtcVad_CalcVad8khz((VadInstT*)vad_inst, speech_frame, frame_length);

    } else
    {
        return -1; // Not a supported sampling frequency
    }

    if (vad > 0)
    {
        return 1;
    } else if (vad == 0)
    {
        return 0;
    } else
    {
        return -1;
    }
}