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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJMEDIA_SILENCE_DET_H__
+#define __PJMEDIA_SILENCE_DET_H__
+
+
+/**
+ * @file silencedet.h
+ * @brief Adaptive silence detector.
+ */
+#include <pjmedia/types.h>
+
+
+/**
+ * @defgroup PJMEDIA_SILENCEDET Adaptive Silence Detection
+ * @ingroup PJMEDIA_FRAME_OP
+ * @brief Adaptive Silence Detector
+ * @{
+ */
+
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Opaque declaration for silence detector.
+ */
+typedef struct pjmedia_silence_det pjmedia_silence_det;
+
+
+
+/**
+ * Create voice activity detector with default settings. The default settings
+ * are set to adaptive silence detection with the default threshold.
+ *
+ * @param pool		    Pool for allocating the structure.
+ * @param clock_rate	    Clock rate.
+ * @param samples_per_frame Number of samples per frame. The clock_rate and
+ *			    samples_per_frame is only used to calculate the
+ *			    frame time, from which some timing parameters
+ *			    are calculated from.
+ * @param p_sd		    Pointer to receive the silence detector instance.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_silence_det_create( pj_pool_t *pool,
+						 unsigned clock_rate,
+						 unsigned samples_per_frame,
+						 pjmedia_silence_det **p_sd );
+
+
+/**
+ * Set silence detector name to identify the particular silence detector
+ * instance in the log.
+ *
+ * @param sd		    The silence detector.
+ * @param name		    Name.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_silence_det_set_name(pjmedia_silence_det *sd,
+						  const char *name);
+
+
+/**
+ * Set the sd to operate in fixed threshold mode. With fixed threshold mode,
+ * the threshold will not be changed adaptively.
+ *
+ * @param sd		    The silence detector
+ * @param threshold	    The silence threshold, or -1 to use default
+ *			    threshold.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_silence_det_set_fixed( pjmedia_silence_det *sd,
+						    int threshold );
+
+/**
+ * Set the sd to operate in adaptive mode. This is the default mode
+ * when the silence detector is created.
+ *
+ * @param sd		    The silence detector
+ * @param threshold	    Initial threshold to be set, or -1 to use default
+ *			    threshold.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_silence_det_set_adaptive(pjmedia_silence_det *sd,
+						      int threshold);
+
+/**
+ * Set other silence detector parameters.
+ *
+ * @param sd		    The silence detector
+ * @param before_silence    Minimum duration of silence (in msec) before 
+ *			    silence is reported. If -1 is specified, then
+ *			    the default value will be used. The default is
+ *			    400 msec.
+ * @param recalc_time1	    The interval (in msec) to recalculate threshold
+ *			    in non-silence condition when adaptive silence 
+ *			    detection is set. If -1 is specified, then the 
+ *			    default value will be used. The default is 4000
+ *			    (msec).
+ * @param recalc_time2	    The interval (in msec) to recalculate threshold
+ *			    in silence condition when adaptive silence detection
+ *			    is set. If -1 is specified, then the default value 
+ *			    will be used. The default value is 2000 (msec).
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_silence_det_set_params( pjmedia_silence_det *sd,
+						     int before_silence,
+						     int recalc_time1,
+						     int recalc_time2);
+
+
+/**
+ * Disable the silence detector.
+ *
+ * @param sd		The silence detector
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_silence_det_disable( pjmedia_silence_det *sd );
+
+
+/**
+ * Perform voice activity detection on the given input samples. This
+ * function uses #pjmedia_calc_avg_signal() and #pjmedia_silence_det_apply()
+ * for its calculation.
+ *
+ * @param sd		The silence detector instance.
+ * @param samples	Pointer to 16-bit PCM input samples.
+ * @param count		Number of samples in the input.
+ * @param p_level	Optional pointer to receive average signal level
+ *			of the input samples.
+ *
+ * @return		Non zero if signal is silence.
+ */
+PJ_DECL(pj_bool_t) pjmedia_silence_det_detect( pjmedia_silence_det *sd,
+					       const pj_int16_t samples[],
+					       pj_size_t count,
+					       pj_int32_t *p_level);
+
+
+/**
+ * Calculate average signal level for the given samples.
+ *
+ * @param samples	Pointer to 16-bit PCM samples.
+ * @param count		Number of samples in the input.
+ *
+ * @return		The average signal level, which simply is total level
+ *			divided by number of samples.
+ */
+PJ_DECL(pj_int32_t) pjmedia_calc_avg_signal( const pj_int16_t samples[],
+					     pj_size_t count );
+
+
+
+/**
+ * Perform voice activity detection, given the specified average signal
+ * level.
+ *
+ * @param sd		The silence detector instance.
+ * @param level		Signal level.
+ *
+ * @return		Non zero if signal is silence.
+ */
+PJ_DECL(pj_bool_t) pjmedia_silence_det_apply( pjmedia_silence_det *sd,
+					      pj_uint32_t level);
+
+
+
+PJ_END_DECL
+
+
+/**
+ * @}
+ */
+
+
+#endif	/* __PJMEDIA_SILENCE_DET_H__ */
+