Major modification in conference bridge to allow ports with different ptime and sampling rate. Also introduced sampling rate converter

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@277 74dad513-b988-da41-8d7b-12977e46ad98

12 files changed, 22123 insertions, 167 deletions

diff --git a/pjmedia/build/pjmedia.dsp b/pjmedia/build/pjmedia.dsp
index 1475636f..f7bf4024 100644
--- a/pjmedia/build/pjmedia.dsp
+++ b/pjmedia/build/pjmedia.dsp
@@ -133,6 +133,10 @@ SOURCE=..\src\pjmedia\port.c
 # End Source File

 # Begin Source File

 

+SOURCE=..\src\pjmedia\resample.c

+# End Source File

+# Begin Source File

+

 SOURCE=..\src\pjmedia\rtcp.c

 # End Source File

 # Begin Source File

@@ -213,6 +217,10 @@ SOURCE=..\include\pjmedia\port.h
 # End Source File

 # Begin Source File

 

+SOURCE=..\include\pjmedia\resample.h

+# End Source File

+# Begin Source File

+

 SOURCE=..\include\pjmedia\rtcp.h

 # End Source File

 # Begin Source File

@@ -256,7 +264,7 @@ SOURCE=..\include\pjmedia\types.h
 SOURCE=..\include\pjmedia\wave.h

 # End Source File

 # End Group

-# Begin Group "PortAudio"

+# Begin Group "PortAudio Files"

 

 # PROP Default_Filter ""

 # Begin Source File

@@ -395,5 +403,17 @@ SOURCE=..\src\pjmedia\portaudio\pa_x86_plain_converters.h
 SOURCE=..\src\pjmedia\portaudio\portaudio.h

 # End Source File

 # End Group

+# Begin Group "Resample Files"

+

+# PROP Default_Filter ""

+# Begin Source File

+

+SOURCE=..\src\pjmedia\largefilter.h

+# End Source File

+# Begin Source File

+

+SOURCE=..\src\pjmedia\smallfilter.h

+# End Source File

+# End Group

 # End Target

 # End Project

diff --git a/pjmedia/include/pjmedia/conference.h b/pjmedia/include/pjmedia/conference.h
index 775e2ff7..3b850cbd 100644
--- a/pjmedia/include/pjmedia/conference.h
+++ b/pjmedia/include/pjmedia/conference.h
@@ -45,6 +45,8 @@ typedef struct pjmedia_conf_port_info
     pjmedia_port_op	tx_setting;
     pjmedia_port_op	rx_setting;
     pj_bool_t	       *listener;
+    unsigned		clock_rate;
+    unsigned		samples_per_frame;
 } pjmedia_conf_port_info;
 
 
diff --git a/pjmedia/include/pjmedia/resample.h b/pjmedia/include/pjmedia/resample.h
new file mode 100644
index 00000000..63b3351d
--- /dev/null
+++ b/pjmedia/include/pjmedia/resample.h
@@ -0,0 +1,76 @@
+/* $Id$ */
+/* 
+ * Copyright (C) 2003-2006 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_RESAMPLE_H__
+#define __PJMEDIA_RESAMPLE_H__
+
+
+
+/**
+ * @file reample.h
+ * @brief Sample rate converter.
+ */
+#include "pjmedia/types.h"
+
+PJ_BEGIN_DECL
+
+/**
+ * Opaque resample session.
+ */
+typedef struct pjmedia_resample pjmedia_resample;
+
+/**
+ * Create a frame based resample session.
+ *
+ * @param pool			Pool to allocate the structure and buffers.
+ * @param high_quality		If true, then high quality conversion will be
+ *				used, at the expense of more CPU and memory,
+ *				because temporary buffer needs to be created.
+ * @param large_filter		If true, large filter size will be used.
+ * @param rate_in		Clock rate of the input samples.
+ * @param rate_out		Clock rate of the output samples.
+ * @param samples_per_frame	Number of samples per frame in the input.
+ * @param p_resample		Pointer to receive the resample session.
+ *
+ * @return PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_resample_create(pj_pool_t *pool,
+					     pj_bool_t high_quality,
+					     pj_bool_t large_filter,
+					     unsigned rate_in,
+					     unsigned rate_out,
+					     unsigned samples_per_frame,
+					     pjmedia_resample **p_resample);
+
+
+/**
+ * Resample a frame.
+ *
+ * @param resample		The resample session.
+ * @param input			Buffer containing the input samples.
+ * @param output		Buffer to store the output samples.
+ */
+PJ_DECL(void) pjmedia_resample_run( pjmedia_resample *resample,
+				    const pj_int16_t *input,
+				    pj_int16_t *output );
+
+
+PJ_END_DECL
+
+#endif	/* __PJMEDIA_RESAMPLE_H__ */
+
diff --git a/pjmedia/src/pjmedia/conference.c b/pjmedia/src/pjmedia/conference.c
index 39206396..087468c7 100644
--- a/pjmedia/src/pjmedia/conference.c
+++ b/pjmedia/src/pjmedia/conference.c
@@ -17,11 +17,12 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
  */
 #include <pjmedia/conference.h>
-#include <pjmedia/silencedet.h>
-#include <pjmedia/stream.h>
-#include <pjmedia/sound.h>
 #include <pjmedia/errno.h>
 #include <pjmedia/port.h>
+#include <pjmedia/resample.h>
+#include <pjmedia/silencedet.h>
+#include <pjmedia/sound.h>
+#include <pjmedia/stream.h>
 #include <pj/assert.h>
 #include <pj/log.h>
 #include <pj/pool.h>
@@ -39,6 +40,8 @@
 #define THIS_FILE	"conference.c"
 #define RX_BUF_COUNT	8
 
+#define BYTES_PER_SAMPLE    2
+
 /*
  * DON'T GET CONFUSED!!
  *
@@ -47,6 +50,9 @@
  */
 
 
+/**
+ * This is a port connected to conference bridge.
+ */
 struct conf_port
 {
     pj_str_t		 name;		/**< Port name.			    */
@@ -57,27 +63,62 @@ struct conf_port
     pj_bool_t		*listeners;	/**< Array of listeners.	    */
     pjmedia_silence_det	*vad;		/**< VAD for this port.		    */
 
-    /* Tx buffer contains the frame to be "transmitted" to this port
-     * (i.e. for put_frame()).
-     * We use dual buffer since the port may be accessed by two threads,
-     * and we don't want to use mutex for synchronization.
+    /* Shortcut for port info. */
+    unsigned		 clock_rate;	/**< Port's clock rate.		    */
+    unsigned		 samples_per_frame; /**< Port's samples per frame.  */
+
+    /* Resample, for converting clock rate, if they're different. */
+    pjmedia_resample	*rx_resample;
+    pjmedia_resample	*tx_resample;
+
+    /* RX buffer is temporary buffer to be used when there is mismatch
+     * between port's sample rate or ptime with conference's sample rate
+     * or ptime. When both sample rate and ptime of the port match the
+     * conference settings, this buffer will not be used.
+     * 
+     * This buffer contains samples at port's clock rate.
+     * The size of this buffer is the sum between port's samples per frame
+     * and bridge's samples per frame.
      */
-    pj_int16_t		*cur_tx_buf;	/**< Buffer for put_frame().	    */
-    pj_int16_t		*tx_buf1;	/**< Buffer 1.			    */
-    pj_int16_t		*tx_buf2;	/**< Buffer 2.			    */
+    pj_int16_t		*rx_buf;	/**< The RX buffer.		    */
+    unsigned		 rx_buf_cap;	/**< Max size, in samples	    */
+    unsigned		 rx_buf_count;	/**< # of samples in the buf.	    */
 
-    /* Rx buffers is a special buffer for sound device port (port 0). 
-     * It's not used by other ports.
-     */
-    int			 rx_write, rx_read;
-    pj_int16_t		*rx_buf[RX_BUF_COUNT];	/**< Buffer 			    */
-
-
-    /* Sum buf is a temporary buffer used to calculate the average signal
+    /* Mix buf is a temporary buffer used to calculate the average signal
      * received by this port from all other ports.
+     *
+     * This buffer contains samples at bridge's clock rate.
+     * The size of this buffer is equal to samples per frame of the bridge.
+     *
+     * Note that the samples here are unsigned 32bit.
      */
     unsigned		 sources;	/**< Number of sources.		    */
-    pj_uint32_t		*sum_buf;	/**< Total sum of signal.	    */
+    pj_uint32_t		*mix_buf;	/**< Total sum of signal.	    */
+
+    /* Tx buffer is a temporary buffer to be used when there's mismatch 
+     * between port's clock rate or ptime with conference's sample rate
+     * or ptime. When both sample rate and ptime of the port match the
+     * conference's settings, this buffer will not be used.
+     * 
+     * This buffer contains samples at port's clock rate.
+     * The size of this buffer is the sum between port's samples per frame
+     * and bridge's samples per frame.
+     */
+    pj_int16_t		*tx_buf;	/**< Tx buffer.			    */
+    unsigned		 tx_buf_cap;	/**< Max size, in samples.	    */
+    unsigned		 tx_buf_count;	/**< # of samples in the buffer.    */
+
+    /* Snd buffers is a special buffer for sound device port (port 0). 
+     * It's not used by other ports.
+     *
+     * There are multiple numbers of this buffer, because we can not expect
+     * the mic and speaker thread to run equally after one another. In most
+     * systems, each thread will run multiple times before the other thread
+     * gains execution time. For example, in my system, mic thread is called
+     * three times, then speaker thread is called three times, and so on.
+     */
+    int			 snd_write_pos, snd_read_pos;
+    pj_int16_t		*snd_buf[RX_BUF_COUNT];	/**< Buffer 		    */
 };
 
 
@@ -94,10 +135,10 @@ struct pjmedia_conf
     pj_mutex_t		 *mutex;	/**< Conference mutex.		    */
     struct conf_port	**ports;	/**< Array of ports.		    */
     pj_uint16_t		 *uns_buf;	/**< Buf for unsigned conversion    */
-    unsigned		  sampling_rate;	/**< Sampling rate.	    */
+    unsigned		  clock_rate;	/**< Sampling rate.	    */
     unsigned		  samples_per_frame;	/**< Samples per frame.	    */
     unsigned		  bits_per_sample;	/**< Bits per sample.	    */
-    pj_snd_stream_info	  snd_info;
+    pj_snd_stream_info	  snd_info;	/**< Sound device parameter.	    */
 };
 
 
@@ -119,6 +160,7 @@ static pj_status_t rec_cb(  /* in */  void *user_data,
  */
 static pj_status_t create_conf_port( pj_pool_t *pool,
 				     pjmedia_conf *conf,
+				     pjmedia_port *port,
 				     const pj_str_t *name,
 				     struct conf_port **p_conf_port)
 {
@@ -149,26 +191,82 @@ static pj_status_t create_conf_port( pj_pool_t *pool,
 
     pjmedia_silence_det_set_adaptive(conf_port->vad, conf->samples_per_frame);
 
+    /* Save some port's infos, for convenience. */
+    if (port) {
+	conf_port->port = port;
+	conf_port->clock_rate = port->info.sample_rate;
+	conf_port->samples_per_frame = port->info.samples_per_frame;
+    } else {
+	conf_port->port = NULL;
+	conf_port->clock_rate = conf->clock_rate;
+	conf_port->samples_per_frame = conf->samples_per_frame;
+    }
 
-    /* Create TX buffers. */
-    conf_port->tx_buf1 = pj_pool_zalloc(pool, conf->samples_per_frame *
-					      sizeof(conf_port->tx_buf1[0]));
-    PJ_ASSERT_RETURN(conf_port->tx_buf1, PJ_ENOMEM);
+    /* If port's clock rate is different than conference's clock rate,
+     * create a resample sessions.
+     */
+    if (conf_port->clock_rate != conf->clock_rate) {
 
-    conf_port->tx_buf2 = pj_pool_zalloc(pool, conf->samples_per_frame *
-					      sizeof(conf_port->tx_buf2[0]));
-    PJ_ASSERT_RETURN(conf_port->tx_buf2, PJ_ENOMEM);
+	double factor;
 
-    /* Set initial TX buffer */
-    conf_port->cur_tx_buf = conf_port->tx_buf1;
+	factor = 1.0 * conf_port->clock_rate / conf->clock_rate;
 
-    /* Create temporary buffer to calculate average signal received by
-     * this port.
+	/* Create resample for rx buffer. */
+	status = pjmedia_resample_create( pool, 
+					  PJ_TRUE,  /* High quality */
+					  PJ_TRUE,  /* Large filter */
+					  conf_port->clock_rate,/* Rate in */
+					  conf->clock_rate, /* Rate out */
+					  (unsigned)(conf->samples_per_frame * 
+						     factor),
+					  &conf_port->rx_resample);
+	if (status != PJ_SUCCESS)
+	    return status;
+
+
+	/* Create resample for tx buffer. */
+	status = pjmedia_resample_create(pool,
+					 PJ_TRUE,   /* High quality */
+					 PJ_TRUE,   /* Large filter */
+					 conf->clock_rate,  /* Rate in */
+					 conf_port->clock_rate, /* Rate out */
+					 conf->samples_per_frame,
+					 &conf_port->tx_resample);
+	if (status != PJ_SUCCESS)
+	    return status;
+    }
+
+    /*
+     * Initialize rx and tx buffer, only when port's samples per frame or 
+     * port's clock rate is different then the conference bridge settings.
      */
-    conf_port->sum_buf = pj_pool_zalloc(pool, conf->samples_per_frame *
-					      sizeof(conf_port->sum_buf[0]));
+    if (conf_port->clock_rate != conf->clock_rate ||
+	conf_port->samples_per_frame != conf->samples_per_frame)
+    {
+	/* Create RX buffer. */
+	conf_port->rx_buf_cap = (unsigned)(conf_port->samples_per_frame +
+					   conf->samples_per_frame * 
+					   conf_port->clock_rate * 1.0 /
+					   conf->clock_rate);
+	conf_port->rx_buf_count = 0;
+	conf_port->rx_buf = pj_pool_alloc(pool, conf_port->rx_buf_cap *
+						sizeof(conf_port->rx_buf[0]));
+	PJ_ASSERT_RETURN(conf_port->rx_buf, PJ_ENOMEM);
+
+	/* Create TX buffer. */
+	conf_port->tx_buf_cap = conf_port->rx_buf_cap;
+	conf_port->tx_buf_count = 0;
+	conf_port->tx_buf = pj_pool_alloc(pool, conf_port->tx_buf_cap *
+						sizeof(conf_port->tx_buf[0]));
+	PJ_ASSERT_RETURN(conf_port->tx_buf, PJ_ENOMEM);
+    }
+
+
+    /* Create mix buffer. */
+    conf_port->mix_buf = pj_pool_zalloc(pool, conf->samples_per_frame *
+					      sizeof(conf_port->mix_buf[0]));
+    PJ_ASSERT_RETURN(conf_port->mix_buf, PJ_ENOMEM);
 
-    
 
     /* Done */
     *p_conf_port = conf_port;
@@ -189,7 +287,7 @@ static pj_status_t create_sound_port( pj_pool_t *pool,
 
     /* Init default sound device parameters. */
     pj_memset(&conf->snd_info, 0, sizeof(conf->snd_info));
-    conf->snd_info.samples_per_sec = conf->sampling_rate;
+    conf->snd_info.samples_per_sec = conf->clock_rate;
     conf->snd_info.bits_per_sample = conf->bits_per_sample;
     conf->snd_info.samples_per_frame = conf->samples_per_frame;
     conf->snd_info.bytes_per_frame = conf->samples_per_frame * 
@@ -198,21 +296,21 @@ static pj_status_t create_sound_port( pj_pool_t *pool,
     
 
     /* Create port */
-    status = create_conf_port(pool, conf, &name, &conf_port);
+    status = create_conf_port(pool, conf, NULL, &name, &conf_port);
     if (status != PJ_SUCCESS)
 	goto on_error;
 
     /* Sound device has rx buffers. */
     for (i=0; i<RX_BUF_COUNT; ++i) {
-	conf_port->rx_buf[i] = pj_pool_zalloc(pool, conf->samples_per_frame *
-					      sizeof(conf_port->rx_buf[0][0]));
-	if (conf_port->rx_buf[i] == NULL) {
+	conf_port->snd_buf[i] = pj_pool_zalloc(pool, conf->samples_per_frame *
+					      sizeof(conf_port->snd_buf[0][0]));
+	if (conf_port->snd_buf[i] == NULL) {
 	    status = PJ_ENOMEM;
 	    goto on_error;
 	}
     }
-    conf_port->rx_write = 0;
-    conf_port->rx_read = 0;
+    conf_port->snd_write_pos = 0;
+    conf_port->snd_read_pos = 0;
 
 
      /* Set to port zero */
@@ -232,7 +330,7 @@ on_error:
  */
 PJ_DEF(pj_status_t) pjmedia_conf_create( pj_pool_t *pool,
 					 unsigned max_ports,
-					 unsigned sampling_rate,
+					 unsigned clock_rate,
 					 unsigned samples_per_frame,
 					 unsigned bits_per_sample,
 					 pjmedia_conf **p_conf )
@@ -240,6 +338,9 @@ PJ_DEF(pj_status_t) pjmedia_conf_create( pj_pool_t *pool,
     pjmedia_conf *conf;
     pj_status_t status;
 
+    /* Can only accept 16bits per sample, for now.. */
+    PJ_ASSERT_RETURN(bits_per_sample == 16, PJ_EINVAL);
+
     PJ_LOG(5,(THIS_FILE, "Creating conference bridge with %d ports",
 	      max_ports));
 
@@ -251,7 +352,7 @@ PJ_DEF(pj_status_t) pjmedia_conf_create( pj_pool_t *pool,
     PJ_ASSERT_RETURN(conf->ports, PJ_ENOMEM);
 
     conf->max_ports = max_ports;
-    conf->sampling_rate = sampling_rate;
+    conf->clock_rate = clock_rate;
     conf->samples_per_frame = samples_per_frame;
     conf->bits_per_sample = bits_per_sample;
 
@@ -402,15 +503,12 @@ PJ_DEF(pj_status_t) pjmedia_conf_add_port( pjmedia_conf *conf,
     pj_assert(index != conf->max_ports);
 
     /* Create port structure. */
-    status = create_conf_port(pool, conf, port_name, &conf_port);
+    status = create_conf_port(pool, conf, strm_port, port_name, &conf_port);
     if (status != PJ_SUCCESS) {
 	pj_mutex_unlock(conf->mutex);
 	return status;
     }
 
-    /* Set the port */
-    conf_port->port = strm_port;
-
     /* Put the port. */
     conf->ports[index] = conf_port;
     conf->port_cnt++;
@@ -634,6 +732,8 @@ PJ_DEF(pj_status_t) pjmedia_conf_get_port_info( pjmedia_conf *conf,
     info->tx_setting = conf_port->tx_setting;
     info->rx_setting = conf_port->rx_setting;
     info->listener = conf_port->listeners;
+    info->clock_rate = conf_port->clock_rate;
+    info->samples_per_frame = conf_port->samples_per_frame;
 
     return PJ_SUCCESS;
 }
@@ -672,6 +772,214 @@ static pj_int16_t unsigned2pcm(pj_uint32_t uns)
     return (pj_int16_t)(uns - 32767);
 }
 
+/* Copy samples */
+PJ_INLINE(void) copy_samples(pj_int16_t *dst, 
+				const pj_int16_t *src,
+				unsigned count)
+{
+    unsigned i;
+    for (i=0; i<count; ++i)
+	dst[i] = src[i];
+}
+
+/* Zero samples. */
+PJ_INLINE(void) zero_samples(pj_int16_t *buf, unsigned count)
+{
+    unsigned i;
+    for (i=0; i<count; ++i)
+	buf[i] = 0;
+}
+
+
+/*
+ * Read from port.
+ */
+static pj_status_t read_port( pjmedia_conf *conf,
+			      struct conf_port *cport, pj_int16_t *frame,
+			      pj_size_t count, pjmedia_frame_type *type )
+{
+
+    pj_assert(count == conf->samples_per_frame);
+
+    /* If port's samples per frame and sampling rate matches conference
+     * bridge's settings, get the frame directly from the port.
+     */
+    if (cport->rx_buf_cap == 0) {
+	pjmedia_frame f;
+	pj_status_t status;
+
+	f.buf = frame;
+	f.size = count * BYTES_PER_SAMPLE;
+
+	status = (cport->port->get_frame)(cport->port, &f);
+
+	*type = f.type;
+
+	return status;
+
+    } else {
+
+	/*
+	 * If we don't have enough samples in rx_buf, read from the port 
+	 * first. Remember that rx_buf may be in different clock rate!
+	 */
+	while (cport->rx_buf_count < count * 1.0 *
+		cport->clock_rate / conf->clock_rate) {
+
+	    pjmedia_frame f;
+	    pj_status_t status;
+
+	    f.buf = cport->rx_buf + cport->rx_buf_count;
+	    f.size = cport->samples_per_frame * BYTES_PER_SAMPLE;
+
+	    status = pjmedia_port_get_frame(cport->port, &f);
+
+	    if (status != PJ_SUCCESS) {
+		/* Fatal error! */
+		return status;
+	    }
+
+	    if (f.type != PJMEDIA_FRAME_TYPE_AUDIO) {
+		zero_samples( cport->rx_buf + cport->rx_buf_count,
+			      cport->samples_per_frame);
+	    }
+
+	    cport->rx_buf_count += cport->samples_per_frame;
+
+	    pj_assert(cport->rx_buf_count <= cport->rx_buf_cap);
+	}
+
+	/*
+	 * If port's clock_rate is different, resample.
+	 * Otherwise just copy.
+	 */
+	if (cport->clock_rate != conf->clock_rate) {
+	    
+	    unsigned src_count;
+
+	    pjmedia_resample_run( cport->rx_resample,cport->rx_buf, frame);
+
+	    src_count = (unsigned)(count * 1.0 * cport->clock_rate / 
+				   conf->clock_rate);
+	    cport->rx_buf_count -= src_count;
+	    if (cport->rx_buf_count) {
+		copy_samples(cport->rx_buf, cport->rx_buf+src_count,
+			     cport->rx_buf_count);
+	    }
+
+	} else {
+
+	    copy_samples(frame, cport->rx_buf, count);
+	    cport->rx_buf_count -= count;
+	    if (cport->rx_buf_count) {
+		copy_samples(cport->rx_buf, cport->rx_buf+count,
+			     cport->rx_buf_count);
+	    }
+	}
+    }
+
+    return PJ_SUCCESS;
+}
+
+
+/*
+ * Write the mixed signal to the port.
+ */
+static pj_status_t write_port(pjmedia_conf *conf, struct conf_port *cport,
+			      pj_uint32_t timestamp)
+{
+    pj_int16_t *buf;
+    unsigned j;
+
+    /* If port is muted or nobody is transmitting to this port, 
+     * transmit NULL frame. 
+     */
+    if (cport->tx_setting == PJMEDIA_PORT_MUTE || cport->sources==0) {
+
+	pjmedia_frame frame;
+
+	frame.type = PJMEDIA_FRAME_TYPE_NONE;
+	frame.buf = NULL;
+	frame.size = 0;
+
+	if (cport->port)
+	    pjmedia_port_put_frame(cport->port, &frame);
+
+	return PJ_SUCCESS;
+
+    } else if (cport->tx_setting != PJMEDIA_PORT_ENABLE) {
+	return PJ_SUCCESS;
+    }
+
+    /* If there are sources in the mix buffer, convert the mixed samples
+     * to the mixed samples itself. This is possible because mixed sample
+     * is 32bit.
+     */
+    buf = (pj_int16_t*)cport->mix_buf;
+    for (j=0; j<conf->samples_per_frame; ++j) {
+	buf[j] = unsigned2pcm(cport->mix_buf[j] / cport->sources);
+    }
+
+    /* If port has the same clock_date and samples_per_frame settings as
+     * the conference bridge, transmit the frame as is.
+     */
+    if (cport->clock_rate == conf->clock_rate &&
+	cport->samples_per_frame == conf->samples_per_frame)
+    {
+	pjmedia_frame frame;
+
+	frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
+	frame.buf = (pj_int16_t*)cport->mix_buf;
+	frame.size = conf->samples_per_frame * BYTES_PER_SAMPLE;
+	frame.timestamp.u64 = timestamp;
+
+	if (cport->port != NULL)
+	    return pjmedia_port_put_frame(cport->port, &frame);
+	else
+	    return PJ_SUCCESS;
+    }
+
+    /* If it has different clock_rate, must resample. */
+    if (cport->clock_rate != conf->clock_rate) {
+
+	unsigned dst_count;
+
+	pjmedia_resample_run( cport->tx_resample, buf, 
+			      cport->tx_buf + cport->tx_buf_count );
+
+	dst_count = (unsigned)(conf->samples_per_frame * 1.0 *
+			       cport->clock_rate / conf->clock_rate);
+	cport->tx_buf_count += dst_count;
+
+    } else {
+	/* Same clock rate.
+	 * Just copy the samples to tx_buffer.
+	 */
+	copy_samples( cport->tx_buf + cport->tx_buf_count,
+		      buf, conf->samples_per_frame );
+	cport->tx_buf_count += conf->samples_per_frame;
+    }
+
+    /* Transmit once we have enough frame in the tx_buf. */
+    if (cport->tx_buf_count >= cport->samples_per_frame) {
+	
+	pjmedia_frame frame;
+
+	frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
+	frame.buf = cport->tx_buf;
+	frame.size = cport->samples_per_frame * BYTES_PER_SAMPLE;
+	frame.timestamp.u64 = timestamp;
+
+	if (cport->port)
+	    return pjmedia_port_put_frame(cport->port, &frame);
+	else
+	    return PJ_SUCCESS;
+    }
+
+    return PJ_SUCCESS;
+}
+
+
 /*
  * Player callback.
  */
@@ -681,7 +989,6 @@ static pj_status_t play_cb( /* in */  void *user_data,
 			    /* out */ unsigned size)
 {
     pjmedia_conf *conf = user_data;
-    pj_int16_t *output_buf = output;
     unsigned ci, cj, i, j;
     
     PJ_UNUSED_ARG(timestamp);
@@ -694,7 +1001,7 @@ static pj_status_t play_cb( /* in */  void *user_data,
     /* Zero all port's temporary buffers. */
     for (i=0, ci=0; i<conf->max_ports && ci < conf->port_cnt; ++i) {
 	struct conf_port *conf_port = conf->ports[i];
-	pj_uint32_t *sum_buf;
+	pj_uint32_t *mix_buf;
 
 	/* Skip empty slot. */
 	if (!conf_port)
@@ -703,14 +1010,14 @@ static pj_status_t play_cb( /* in */  void *user_data,
 	++ci;
 
 	conf_port->sources = 0;
-	sum_buf = conf_port->sum_buf;
+	mix_buf = conf_port->mix_buf;
 
 	for (j=0; j<conf->samples_per_frame; ++j)
-	    sum_buf[j] = 0;
+	    mix_buf[j] = 0;
     }
 
     /* Get frames from all ports, and "mix" the signal 
-     * to sum_buf of all listeners of the port.
+     * to mix_buf of all listeners of the port.
      */
     for (i=0, ci=0; i<conf->max_ports && ci<conf->port_cnt; ++i) {
 	struct conf_port *conf_port = conf->ports[i];
@@ -732,11 +1039,11 @@ static pj_status_t play_cb( /* in */  void *user_data,
 	 * instead.
 	 */
 	if (i==0) {
-	    pj_int16_t *rx_buf;
+	    pj_int16_t *snd_buf;
 
-	    if (conf_port->rx_read == conf_port->rx_write) {
-		conf_port->rx_read = 
-		    (conf_port->rx_write+RX_BUF_COUNT-RX_BUF_COUNT/2) % 
+	    if (conf_port->snd_read_pos == conf_port->snd_write_pos) {
+		conf_port->snd_read_pos = 
+		    (conf_port->snd_write_pos+RX_BUF_COUNT-RX_BUF_COUNT/2) % 
 			RX_BUF_COUNT;
 	    }
 
@@ -751,28 +1058,31 @@ static pj_status_t play_cb( /* in */  void *user_data,
 		continue;
 	    }
 
-	    rx_buf = conf_port->rx_buf[conf_port->rx_read];
+	    snd_buf = conf_port->snd_buf[conf_port->snd_read_pos];
 	    for (j=0; j<conf->samples_per_frame; ++j) {
-		((pj_int16_t*)output)[j] = rx_buf[j];
+		((pj_int16_t*)output)[j] = snd_buf[j];
 	    }
-	    conf_port->rx_read = (conf_port->rx_read+1) % RX_BUF_COUNT;
+	    conf_port->snd_read_pos = (conf_port->snd_read_pos+1) % RX_BUF_COUNT;
 
 	} else {
-	    pjmedia_frame frame;
 
-	    pj_memset(&frame, 0, sizeof(frame));
-	    frame.buf = output;
-	    frame.size = size;
-	    pjmedia_port_get_frame(conf_port->port, &frame);
-
-	   if (frame.type == PJMEDIA_FRAME_TYPE_NONE)
+	    pj_status_t status;
+	    pjmedia_frame_type frame_type;
+
+	    status = read_port(conf, conf_port, output, 
+			       conf->samples_per_frame, &frame_type);
+	    
+	    if (status != PJ_SUCCESS) {
+		PJ_LOG(4,(THIS_FILE, "Port %.*s get_frame() returned %d. "
+				     "Port is now disabled",
+				     (int)conf_port->name.slen,
+				     conf_port->name.ptr,
+				     status));
+		conf_port->rx_setting = PJMEDIA_PORT_DISABLE;
 		continue;
+	    }
 	}
 
-	/* Skip (after receiving the frame) if this port is muted. */
-	if (conf_port->rx_setting == PJMEDIA_PORT_MUTE)
-	    continue;
-
 	/* Also skip if this port doesn't have listeners. */
 	if (conf_port->listener_cnt == 0)
 	    continue;
@@ -793,7 +1103,7 @@ static pj_status_t play_cb( /* in */  void *user_data,
 	     ++j) 
 	{
 	    struct conf_port *listener = conf->ports[j];
-	    pj_uint32_t *sum_buf;
+	    pj_uint32_t *mix_buf;
 	    unsigned k;
 
 	    if (listener == 0)
@@ -810,9 +1120,9 @@ static pj_status_t play_cb( /* in */  void *user_data,
 		continue;
 
 	    /* Mix the buffer */
-	    sum_buf = listener->sum_buf;
+	    mix_buf = listener->mix_buf;
 	    for (k=0; k<conf->samples_per_frame; ++k)
-		sum_buf[k] += (conf->uns_buf[k] * level);
+		mix_buf[k] += (conf->uns_buf[k] * level);
 
 	    listener->sources += level;
 	}
@@ -821,75 +1131,31 @@ static pj_status_t play_cb( /* in */  void *user_data,
     /* For all ports, calculate avg signal. */
     for (i=0, ci=0; i<conf->max_ports && ci<conf->port_cnt; ++i) {
 	struct conf_port *conf_port = conf->ports[i];
-	pjmedia_frame frame;
-	pj_int16_t *target_buf;
+	pj_status_t status;
 
 	if (!conf_port)
 	    continue;
 
 	++ci;
 
-	if (conf_port->tx_setting == PJMEDIA_PORT_MUTE) {
-	    frame.type = PJMEDIA_FRAME_TYPE_NONE;
-	    frame.buf = NULL;
-	    frame.size = 0;
-
-	    if (conf_port->port)
-		pjmedia_port_put_frame(conf_port->port, &frame);
-
+	status = write_port( conf, conf_port, timestamp);
+	if (status != PJ_SUCCESS) {
+	    PJ_LOG(4,(THIS_FILE, "Port %.*s put_frame() returned %d. "
+				 "Port is now disabled",
+				 (int)conf_port->name.slen,
+				 conf_port->name.ptr,
+				 status));
+	    conf_port->tx_setting = PJMEDIA_PORT_DISABLE;
 	    continue;
-
-	} else if (conf_port->tx_setting != PJMEDIA_PORT_ENABLE) {
-	    continue;
-	}
-
-	target_buf = (conf_port->cur_tx_buf==conf_port->tx_buf1?
-			conf_port->tx_buf2 : conf_port->tx_buf1);
-
-	if (conf_port->sources) {
-	    for (j=0; j<conf->samples_per_frame; ++j) {
-		target_buf[j] = unsigned2pcm(conf_port->sum_buf[j] / 
-					     conf_port->sources);
-	    }
 	}
-
-	/* Switch buffer. */
-	conf_port->cur_tx_buf = target_buf;
-
-	pj_memset(&frame, 0, sizeof(frame));
-	if (conf_port->sources) {
-
-	    pj_bool_t is_silence = PJ_FALSE;
-
-	    /* Apply silence detection. */
-#if 0
-	    is_silence = pjmedia_silence_det_detect(conf_port->vad,
-						    target_buf,
-						    conf->samples_per_frame,
-						    NULL);
-#endif
-	    frame.type = is_silence ? PJMEDIA_FRAME_TYPE_NONE : 
-				      PJMEDIA_FRAME_TYPE_AUDIO;
-
-	} else
-	    frame.type = PJMEDIA_FRAME_TYPE_NONE;
-
-	frame.buf = conf_port->cur_tx_buf;
-	frame.size = conf->samples_per_frame * conf->bits_per_sample / 8;
-	frame.timestamp.u64 = timestamp;
-
-	if (conf_port->port)
-	    pjmedia_port_put_frame(conf_port->port, &frame);
-
     }
 
     /* Return sound playback frame. */
     if (conf->ports[0]->sources) {
-	for (j=0; j<conf->samples_per_frame; ++j)
-	    output_buf[j] = conf->ports[0]->cur_tx_buf[j];
+	copy_samples( output, (pj_int16_t*)conf->ports[0]->mix_buf, 
+		      conf->samples_per_frame);
     } else {
-	for (j=0; j<conf->samples_per_frame; ++j)
-	    output_buf[j] = 0;
+	zero_samples( output, conf->samples_per_frame ); 
     }
 
     pj_mutex_unlock(conf->mutex);
@@ -908,7 +1174,7 @@ static pj_status_t rec_cb(  /* in */  void *user_data,
 {
     pjmedia_conf *conf = user_data;
     struct conf_port *snd_port = conf->ports[0];
-    pj_int16_t *target_rx_buf;
+    pj_int16_t *target_snd_buf;
     unsigned i;
 
     PJ_UNUSED_ARG(timestamp);
@@ -931,29 +1197,17 @@ static pj_status_t rec_cb(  /* in */  void *user_data,
 
 
     /* Determine which rx_buffer to fill in */
-    target_rx_buf = snd_port->rx_buf[snd_port->rx_write];
+    target_snd_buf = snd_port->snd_buf[snd_port->snd_write_pos];
     
     /* Copy samples from audio device to target rx_buffer */
     for (i=0; i<conf->samples_per_frame; ++i) {
-	target_rx_buf[i] = ((pj_int16_t*)input)[i];
+	target_snd_buf[i] = ((pj_int16_t*)input)[i];
     }
 
     /* Switch buffer */
-    snd_port->rx_write = (snd_port->rx_write+1)%RX_BUF_COUNT;
-
-
-    /* Time for all ports (except sound port) to transmit frames */
-    /*
-    for (i=1; i<conf->max_ports; ++i) {
-	struct conf_port *conf_port = conf->ports[i];
-	pjmedia_frame frame;
+    snd_port->snd_write_pos = (snd_port->snd_write_pos+1)%RX_BUF_COUNT;
 
-	if (!conf_port)
-	    continue;
 
-    }
-    */
-    
     return PJ_SUCCESS;
 }
 
diff --git a/pjmedia/src/pjmedia/file_port.c b/pjmedia/src/pjmedia/file_port.c
index cb8059d3..66022e76 100644
--- a/pjmedia/src/pjmedia/file_port.c
+++ b/pjmedia/src/pjmedia/file_port.c
@@ -27,7 +27,6 @@
 
 
 #define SIGNATURE	('F'<<24|'I'<<16|'L'<<8|'E')
-#define BUF_SIZE	(320*10)
 
 struct file_port
 {
@@ -59,15 +58,20 @@ static struct file_port *create_file_port(pj_pool_t *pool)
     port->base.info.need_info = PJ_FALSE;
     port->base.info.pt = 0xFF;
     port->base.info.encoding_name = pj_str("pcm");
-    port->base.info.sample_rate = 8000;
-    port->base.info.bits_per_sample = 16;
-    port->base.info.samples_per_frame = 160;
-    port->base.info.bytes_per_frame = 320;
 
     port->base.put_frame = &file_put_frame;
     port->base.get_frame = &file_get_frame;
     port->base.on_destroy = &file_on_destroy;
 
+
+    /* Put in default values.
+     * These will be overriden once the file is read.
+     */
+    port->base.info.sample_rate = 8000;
+    port->base.info.bits_per_sample = 16;
+    port->base.info.samples_per_frame = 160;
+    port->base.info.bytes_per_frame = 320;
+
     return port;
 }
 
@@ -136,10 +140,8 @@ PJ_DEF(pj_status_t) pjmedia_file_player_port_create( pj_pool_t *pool,
 
     if (wave_hdr.fmt_hdr.fmt_tag != 1 ||
 	wave_hdr.fmt_hdr.nchan != 1 ||
-	wave_hdr.fmt_hdr.sample_rate != 8000 ||
-	wave_hdr.fmt_hdr.bytes_per_sec != 16000 ||
-	wave_hdr.fmt_hdr.block_align != 2 ||
-	wave_hdr.fmt_hdr.bits_per_sample != 16)
+	wave_hdr.fmt_hdr.bits_per_sample != 16 ||
+	wave_hdr.fmt_hdr.block_align != 2)
     {
 	pj_file_close(fd);
 	return PJMEDIA_EWAVEUNSUPP;
@@ -167,6 +169,16 @@ PJ_DEF(pj_status_t) pjmedia_file_player_port_create( pj_pool_t *pool,
     /* Initialize */
     file_port->base.user_data = user_data;
 
+    /* Update port info. */
+    file_port->base.info.sample_rate = wave_hdr.fmt_hdr.sample_rate;
+    file_port->base.info.bits_per_sample = wave_hdr.fmt_hdr.bits_per_sample;
+    file_port->base.info.samples_per_frame = file_port->base.info.sample_rate *
+					     20 / 1000;
+    file_port->base.info.bytes_per_frame = 
+	file_port->base.info.samples_per_frame * 
+	file_port->base.info.bits_per_sample / 8;
+
+
     /* For this version, we only support reading the whole
      * contents of the file.
      */
@@ -222,17 +234,19 @@ static pj_status_t file_get_frame(pjmedia_port *this_port,
 				  pjmedia_frame *frame)
 {
     struct file_port *port = (struct file_port*)this_port;
-
+    unsigned frame_size;
     pj_assert(port->base.info.signature == SIGNATURE);
 
+    frame_size = port->base.info.bytes_per_frame;
+
     /* Copy frame from buffer. */
     frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
-    frame->size = 320;
+    frame->size = frame_size;
     frame->timestamp.u64 = 0;
 
-    if (port->readpos + 320 <= port->buf + port->bufsize) {
-	pj_memcpy(frame->buf, port->readpos, 320);
-	port->readpos += 320;
+    if (port->readpos + frame_size <= port->buf + port->bufsize) {
+	pj_memcpy(frame->buf, port->readpos, frame_size);
+	port->readpos += frame_size;
 	if (port->readpos == port->buf + port->bufsize)
 	    port->readpos = port->buf;
     } else {
@@ -240,15 +254,15 @@ static pj_status_t file_get_frame(pjmedia_port *this_port,
 
 	endread = (port->buf+port->bufsize) - port->readpos;
 	pj_memcpy(frame->buf, port->readpos, endread);
-	pj_memcpy(((char*)frame->buf)+endread, port->buf, 320-endread);
-	port->readpos = port->buf + (320-endread);
+	pj_memcpy(((char*)frame->buf)+endread, port->buf, frame_size-endread);
+	port->readpos = port->buf + (frame_size - endread);
     }
 
     return PJ_SUCCESS;
 }
 
 /*
- *
+ * Destroy port.
  */
 static pj_status_t file_on_destroy(pjmedia_port *this_port)
 {
diff --git a/pjmedia/src/pjmedia/largefilter.h b/pjmedia/src/pjmedia/largefilter.h
new file mode 100644
index 00000000..16c0c3fc
--- /dev/null
+++ b/pjmedia/src/pjmedia/largefilter.h
@@ -0,0 +1,16391 @@
+/* Included by resamplesubs.c */
+#define LARGE_FILTER_NMULT ((HWORD)65)
+#define LARGE_FILTER_SCALE 14746 /* Unity-gain scale factor */
+#define LARGE_FILTER_NWING 8192 /* Filter table length */
+static HWORD LARGE_FILTER_IMP[] /* Impulse response */ = {
+32767,
+32766,
+32764,
+32761,
+32756,
+32750,
+32743,
+32734,
+32724,
+32713,
+32700,
+32686,
+32671,
+32654,
+32636,
+32617,
+32596,
+32574,
+32551,
+32526,
+32500,
+32473,
+32445,
+32415,
+32383,
+32351,
+32317,
+32282,
+32246,
+32208,
+32169,
+32129,
+32087,
+32044,
+32000,
+31955,
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+31860,
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+31655,
+31601,
+31545,
+31489,
+31431,
+31371,
+31311,
+31249,
+31186,
+31122,
+31056,
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+30783,
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+30098,
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+29933,
+29849,
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+29677,
+29590,
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+29321,
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+-63,
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+-2831,
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+-6626,
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+-6730,
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diff --git a/pjmedia/src/pjmedia/resample.c b/pjmedia/src/pjmedia/resample.c
new file mode 100644
index 00000000..0fd08468
--- /dev/null
+++ b/pjmedia/src/pjmedia/resample.c
@@ -0,0 +1,562 @@
+/* $Id$ */
+/* 
+ * Copyright (C) 2003-2006 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 
+ */
+
+/*
+ * Based on:
+ * resample-1.2.tar.Z (from ftp://ccrma-ftp.stanford.edu/pub/NeXT)
+ * SOFTWARE FOR SAMPLING-RATE CONVERSION AND FIR DIGITAL FILTER DESIGN
+ *
+ * COPYING
+ * 
+ * This software package is Copyright 1994 by Julius O. Smith
+ * (jos@ccrma.stanford.edu), all rights reserved.  Permission to use and copy
+ * is granted subject to the terms of the "GNU Software General Public
+ * License" (see ftp://prep.ai.mit.edu/pub/gnu/COPYING).  In addition, we
+ * request that a copy of any modified files be sent by email to
+ * jos@ccrma.stanford.edu so that we may incorporate them in the CCRMA
+ * version.
+ */
+
+/* PJMEDIA modification:
+ *  - remove resample(), just use SrcUp, SrcUD, and SrcLinear directly.
+ *  - move FilterUp() and FilterUD() from filterkit.c
+ *  - move stddefs.h and resample.h to this file.
+ *  - const correctness.
+ */
+#include <pjmedia/resample.h>
+#include <pjmedia/errno.h>
+#include <pj/assert.h>
+#include <pj/pool.h>
+
+
+
+/*
+ * Taken from stddefs.h
+ */
+#ifndef PI
+#define PI (3.14159265358979232846)
+#endif
+
+#ifndef PI2
+#define PI2 (6.28318530717958465692)
+#endif
+
+#define D2R (0.01745329348)          /* (2*pi)/360 */
+#define R2D (57.29577951)            /* 360/(2*pi) */
+
+#ifndef MAX
+#define MAX(x,y) ((x)>(y) ?(x):(y))
+#endif
+#ifndef MIN
+#define MIN(x,y) ((x)<(y) ?(x):(y))
+#endif
+
+#ifndef ABS
+#define ABS(x)   ((x)<0   ?(-(x)):(x))
+#endif
+
+#ifndef SGN
+#define SGN(x)   ((x)<0   ?(-1):((x)==0?(0):(1)))
+#endif
+
+typedef char           BOOL;
+typedef short          HWORD;
+typedef unsigned short UHWORD;
+typedef int            WORD;
+typedef unsigned int   UWORD;
+
+#define MAX_HWORD (32767)
+#define MIN_HWORD (-32768)
+
+#ifdef DEBUG
+#define INLINE
+#else DEBUG
+#define INLINE inline
+#endif DEBUG
+
+/*
+ * Taken from resample.h
+ *
+ * The configuration constants below govern
+ * the number of bits in the input sample and filter coefficients, the 
+ * number of bits to the right of the binary-point for fixed-point math, etc.
+ *
+ */
+
+/* Conversion constants */
+#define Nhc       8
+#define Na        7
+#define Np       (Nhc+Na)
+#define Npc      (1<<Nhc)
+#define Amask    ((1<<Na)-1)
+#define Pmask    ((1<<Np)-1)
+#define Nh       16
+#define Nb       16
+#define Nhxn     14
+#define Nhg      (Nh-Nhxn)
+#define NLpScl   13
+
+/* Description of constants:
+ *
+ * Npc - is the number of look-up values available for the lowpass filter
+ *    between the beginning of its impulse response and the "cutoff time"
+ *    of the filter.  The cutoff time is defined as the reciprocal of the
+ *    lowpass-filter cut off frequence in Hz.  For example, if the
+ *    lowpass filter were a sinc function, Npc would be the index of the
+ *    impulse-response lookup-table corresponding to the first zero-
+ *    crossing of the sinc function.  (The inverse first zero-crossing
+ *    time of a sinc function equals its nominal cutoff frequency in Hz.)
+ *    Npc must be a power of 2 due to the details of the current
+ *    implementation. The default value of 512 is sufficiently high that
+ *    using linear interpolation to fill in between the table entries
+ *    gives approximately 16-bit accuracy in filter coefficients.
+ *
+ * Nhc - is log base 2 of Npc.
+ *
+ * Na - is the number of bits devoted to linear interpolation of the
+ *    filter coefficients.
+ *
+ * Np - is Na + Nhc, the number of bits to the right of the binary point
+ *    in the integer "time" variable. To the left of the point, it indexes
+ *    the input array (X), and to the right, it is interpreted as a number
+ *    between 0 and 1 sample of the input X.  Np must be less than 16 in
+ *    this implementation.
+ *
+ * Nh - is the number of bits in the filter coefficients. The sum of Nh and
+ *    the number of bits in the input data (typically 16) cannot exceed 32.
+ *    Thus Nh should be 16.  The largest filter coefficient should nearly
+ *    fill 16 bits (32767).
+ *
+ * Nb - is the number of bits in the input data. The sum of Nb and Nh cannot
+ *    exceed 32.
+ *
+ * Nhxn - is the number of bits to right shift after multiplying each input
+ *    sample times a filter coefficient. It can be as great as Nh and as
+ *    small as 0. Nhxn = Nh-2 gives 2 guard bits in the multiply-add
+ *    accumulation.  If Nhxn=0, the accumulation will soon overflow 32 bits.
+ *
+ * Nhg - is the number of guard bits in mpy-add accumulation (equal to Nh-Nhxn)
+ *
+ * NLpScl - is the number of bits allocated to the unity-gain normalization
+ *    factor.  The output of the lowpass filter is multiplied by LpScl and
+ *    then right-shifted NLpScl bits. To avoid overflow, we must have 
+ *    Nb+Nhg+NLpScl < 32.
+ */
+
+
+#ifdef _MSC_VER
+#   pragma warning(push, 3)
+//#   pragma warning(disable: 4245)   // Conversion from uint to ushort
+#   pragma warning(disable: 4244)   // Conversion from double to uint
+#   pragma warning(disable: 4146)   // unary minus operator applied to unsigned type, result still unsigned
+#   pragma warning(disable: 4761)   // integral size mismatch in argument; conversion supplied
+#endif
+
+#include "smallfilter.h"
+#include "largefilter.h"
+
+#undef INLINE
+#define INLINE
+#define HAVE_FILTER 0    
+
+#ifndef NULL
+#   define NULL	0
+#endif
+
+
+static INLINE HWORD WordToHword(WORD v, int scl)
+{
+    HWORD out;
+    WORD llsb = (1<<(scl-1));
+    v += llsb;		/* round */
+    v >>= scl;
+    if (v>MAX_HWORD) {
+	v = MAX_HWORD;
+    } else if (v < MIN_HWORD) {
+	v = MIN_HWORD;
+    }	
+    out = (HWORD) v;
+    return out;
+}
+
+/* Sampling rate conversion using linear interpolation for maximum speed.
+ */
+static int 
+  SrcLinear(const HWORD X[], HWORD Y[], double pFactor, UHWORD nx)
+{
+    HWORD iconst;
+    UWORD time = 0;
+    const HWORD *xp;
+    HWORD *Ystart;
+    WORD v,x1,x2;
+    
+    double dt;                  /* Step through input signal */ 
+    UWORD dtb;                  /* Fixed-point version of Dt */
+    UWORD endTime;              /* When time reaches EndTime, return to user */
+    
+    dt = 1.0/pFactor;            /* Output sampling period */
+    dtb = dt*(1<<Np) + 0.5;     /* Fixed-point representation */
+    
+    Ystart = Y;
+    endTime = time + (1<<Np)*(WORD)nx;
+    while (time < endTime)
+    {
+	iconst = (time) & Pmask;
+	xp = &X[(time)>>Np];      /* Ptr to current input sample */
+	x1 = *xp++;
+	x2 = *xp;
+	x1 *= ((1<<Np)-iconst);
+	x2 *= iconst;
+	v = x1 + x2;
+	*Y++ = WordToHword(v,Np);   /* Deposit output */
+	time += dtb;		    /* Move to next sample by time increment */
+    }
+    return (Y - Ystart);            /* Return number of output samples */
+}
+
+static WORD FilterUp(const HWORD Imp[], const HWORD ImpD[], 
+		     UHWORD Nwing, BOOL Interp,
+		     const HWORD *Xp, HWORD Ph, HWORD Inc)
+{
+    const HWORD *Hp;
+    const HWORD *Hdp = NULL;
+    const HWORD *End;
+    HWORD a = 0;
+    WORD v, t;
+    
+    v=0;
+    Hp = &Imp[Ph>>Na];
+    End = &Imp[Nwing];
+    if (Interp) {
+	Hdp = &ImpD[Ph>>Na];
+	a = Ph & Amask;
+    }
+    if (Inc == 1)		/* If doing right wing...              */
+    {				/* ...drop extra coeff, so when Ph is  */
+	End--;			/*    0.5, we don't do too many mult's */
+	if (Ph == 0)		/* If the phase is zero...           */
+	{			/* ...then we've already skipped the */
+	    Hp += Npc;		/*    first sample, so we must also  */
+	    Hdp += Npc;		/*    skip ahead in Imp[] and ImpD[] */
+	}
+    }
+    if (Interp)
+      while (Hp < End) {
+	  t = *Hp;		/* Get filter coeff */
+	  t += (((WORD)*Hdp)*a)>>Na; /* t is now interp'd filter coeff */
+	  Hdp += Npc;		/* Filter coeff differences step */
+	  t *= *Xp;		/* Mult coeff by input sample */
+	  if (t & (1<<(Nhxn-1)))  /* Round, if needed */
+	    t += (1<<(Nhxn-1));
+	  t >>= Nhxn;		/* Leave some guard bits, but come back some */
+	  v += t;			/* The filter output */
+	  Hp += Npc;		/* Filter coeff step */
+
+	  Xp += Inc;		/* Input signal step. NO CHECK ON BOUNDS */
+      } 
+    else 
+      while (Hp < End) {
+	  t = *Hp;		/* Get filter coeff */
+	  t *= *Xp;		/* Mult coeff by input sample */
+	  if (t & (1<<(Nhxn-1)))  /* Round, if needed */
+	    t += (1<<(Nhxn-1));
+	  t >>= Nhxn;		/* Leave some guard bits, but come back some */
+	  v += t;			/* The filter output */
+	  Hp += Npc;		/* Filter coeff step */
+	  Xp += Inc;		/* Input signal step. NO CHECK ON BOUNDS */
+      }
+    return(v);
+}
+
+
+static WORD FilterUD(const HWORD Imp[], const HWORD ImpD[],
+		     UHWORD Nwing, BOOL Interp,
+		     const HWORD *Xp, HWORD Ph, HWORD Inc, UHWORD dhb)
+{
+    HWORD a;
+    const HWORD *Hp, *Hdp, *End;
+    WORD v, t;
+    UWORD Ho;
+    
+    v=0;
+    Ho = (Ph*(UWORD)dhb)>>Np;
+    End = &Imp[Nwing];
+    if (Inc == 1)		/* If doing right wing...              */
+    {				/* ...drop extra coeff, so when Ph is  */
+	End--;			/*    0.5, we don't do too many mult's */
+	if (Ph == 0)		/* If the phase is zero...           */
+	  Ho += dhb;		/* ...then we've already skipped the */
+    }				/*    first sample, so we must also  */
+				/*    skip ahead in Imp[] and ImpD[] */
+    if (Interp)
+      while ((Hp = &Imp[Ho>>Na]) < End) {
+	  t = *Hp;		/* Get IR sample */
+	  Hdp = &ImpD[Ho>>Na];  /* get interp (lower Na) bits from diff table*/
+	  a = Ho & Amask;	/* a is logically between 0 and 1 */
+	  t += (((WORD)*Hdp)*a)>>Na; /* t is now interp'd filter coeff */
+	  t *= *Xp;		/* Mult coeff by input sample */
+	  if (t & 1<<(Nhxn-1))	/* Round, if needed */
+	    t += 1<<(Nhxn-1);
+	  t >>= Nhxn;		/* Leave some guard bits, but come back some */
+	  v += t;			/* The filter output */
+	  Ho += dhb;		/* IR step */
+	  Xp += Inc;		/* Input signal step. NO CHECK ON BOUNDS */
+      }
+    else 
+      while ((Hp = &Imp[Ho>>Na]) < End) {
+	  t = *Hp;		/* Get IR sample */
+	  t *= *Xp;		/* Mult coeff by input sample */
+	  if (t & 1<<(Nhxn-1))	/* Round, if needed */
+	    t += 1<<(Nhxn-1);
+	  t >>= Nhxn;		/* Leave some guard bits, but come back some */
+	  v += t;			/* The filter output */
+	  Ho += dhb;		/* IR step */
+	  Xp += Inc;		/* Input signal step. NO CHECK ON BOUNDS */
+      }
+    return(v);
+}
+
+/* Sampling rate up-conversion only subroutine;
+ * Slightly faster than down-conversion;
+ */
+static int SrcUp(const HWORD X[], HWORD Y[], double pFactor, 
+		 UHWORD nx, UHWORD pNwing, UHWORD pLpScl,
+		 const HWORD pImp[], const HWORD pImpD[], BOOL Interp)
+{
+    const HWORD *xp;
+    HWORD *Ystart;
+    WORD v;
+    
+    double dt;                  /* Step through input signal */ 
+    UWORD dtb;                  /* Fixed-point version of Dt */
+    UWORD time = 0;
+    UWORD endTime;              /* When time reaches EndTime, return to user */
+    
+    dt = 1.0/pFactor;            /* Output sampling period */
+    dtb = dt*(1<<Np) + 0.5;     /* Fixed-point representation */
+    
+    Ystart = Y;
+    endTime = time + (1<<Np)*(WORD)nx;
+    while (time < endTime)
+    {
+	xp = &X[time>>Np];      /* Ptr to current input sample */
+	/* Perform left-wing inner product */
+	v = 0;
+	v = FilterUp(pImp, pImpD, pNwing, Interp, xp, (HWORD)(time&Pmask),-1);
+
+	/* Perform right-wing inner product */
+	v += FilterUp(pImp, pImpD, pNwing, Interp, xp+1,  (HWORD)((-time)&Pmask),1);
+
+	v >>= Nhg;		/* Make guard bits */
+	v *= pLpScl;		/* Normalize for unity filter gain */
+	*Y++ = WordToHword(v,NLpScl);   /* strip guard bits, deposit output */
+	time += dtb;		/* Move to next sample by time increment */
+    }
+    return (Y - Ystart);        /* Return the number of output samples */
+}
+
+
+/* Sampling rate conversion subroutine */
+
+static int SrcUD(const HWORD X[], HWORD Y[], double pFactor, 
+		 UHWORD nx, UHWORD pNwing, UHWORD pLpScl,
+		 const HWORD pImp[], const HWORD pImpD[], BOOL Interp)
+{
+    const HWORD *xp;
+    HWORD *Ystart;
+    WORD v;
+    
+    double dh;                  /* Step through filter impulse response */
+    double dt;                  /* Step through input signal */
+    UWORD time = 0;
+    UWORD endTime;              /* When time reaches EndTime, return to user */
+    UWORD dhb, dtb;             /* Fixed-point versions of Dh,Dt */
+    
+    dt = 1.0/pFactor;            /* Output sampling period */
+    dtb = dt*(1<<Np) + 0.5;     /* Fixed-point representation */
+    
+    dh = MIN(Npc, pFactor*Npc);  /* Filter sampling period */
+    dhb = dh*(1<<Na) + 0.5;     /* Fixed-point representation */
+    
+    Ystart = Y;
+    endTime = time + (1<<Np)*(WORD)nx;
+    while (time < endTime)
+    {
+	xp = &X[time>>Np];	/* Ptr to current input sample */
+	v = FilterUD(pImp, pImpD, pNwing, Interp, xp, (HWORD)(time&Pmask),
+		     -1, dhb);	/* Perform left-wing inner product */
+	v += FilterUD(pImp, pImpD, pNwing, Interp, xp+1, (HWORD)((-time)&Pmask),
+		      1, dhb);	/* Perform right-wing inner product */
+	v >>= Nhg;		/* Make guard bits */
+	v *= pLpScl;		/* Normalize for unity filter gain */
+	*Y++ = WordToHword(v,NLpScl);   /* strip guard bits, deposit output */
+	time += dtb;		/* Move to next sample by time increment */
+    }
+    return (Y - Ystart);        /* Return the number of output samples */
+}
+
+
+/* ***************************************************************************
+ *
+ * PJMEDIA RESAMPLE 
+ *
+ * ***************************************************************************
+ */
+
+struct pjmedia_resample
+{
+    double	 factor;	/* Conversion factor = rate_out / rate_in.  */
+    pj_bool_t	 large_filter;	/* Large filter?			    */
+    pj_bool_t	 high_quality;	/* Not fast?				    */
+    unsigned	 xoff;		/* History and lookahead size, in samples   */
+    unsigned	 frame_size;	/* Samples per frame.			    */
+    pj_int16_t	*buffer;	/* Input buffer.			    */
+};
+
+
+PJ_DEF(pj_status_t) pjmedia_resample_create( pj_pool_t *pool,
+					     pj_bool_t high_quality,
+					     pj_bool_t large_filter,
+					     unsigned rate_in,
+					     unsigned rate_out,
+					     unsigned samples_per_frame,
+					     pjmedia_resample **p_resample)
+{
+    pjmedia_resample *resample;
+
+    PJ_ASSERT_RETURN(pool && p_resample && rate_in &&
+		     rate_out && samples_per_frame, PJ_EINVAL);
+
+    resample = pj_pool_alloc(pool, sizeof(pjmedia_resample));
+    PJ_ASSERT_RETURN(resample, PJ_ENOMEM);
+
+    /*
+     * If we're downsampling, always use the fast algorithm since it seems
+     * to yield the same performance.
+     */
+    if (rate_out < rate_in) {
+	high_quality = 0;
+    }
+
+    resample->factor = rate_out * 1.0 / rate_in;
+    resample->large_filter = large_filter;
+    resample->high_quality = high_quality;
+    resample->xoff = large_filter ? 32 : 6;
+    resample->frame_size = samples_per_frame;
+
+    if (high_quality) {
+	unsigned size;
+	unsigned i;
+
+	size = (samples_per_frame + 2*resample->xoff) * sizeof(pj_int16_t);
+	resample->buffer = pj_pool_alloc(pool, size);
+	PJ_ASSERT_RETURN(resample->buffer, PJ_ENOMEM);
+
+	for (i=0; i<resample->xoff*2; ++i) {
+	    resample->buffer[i] = 0;
+	}
+    }
+
+    *p_resample = resample;
+    return PJ_SUCCESS;
+}
+
+
+
+PJ_DEF(void) pjmedia_resample_run( pjmedia_resample *resample,
+				   const pj_int16_t *input,
+				   pj_int16_t *output )
+{
+    PJ_ASSERT_ON_FAIL(resample, return);
+
+    if (resample->high_quality) {
+	unsigned i;
+	pj_int16_t *dst_buf;
+	const pj_int16_t *src_buf;
+
+	/* Buffer layout:
+	 *
+	 * run 0 
+	 *     +------+------+--------------+
+	 *     | 0000 | 0000 |  frame0...   |
+	 *     +------+------+--------------+
+	 *     ^      ^      ^              ^
+         *     0    xoff  2*xoff       size+2*xoff 
+         *
+	 * run 01
+	 *     +------+------+--------------+
+	 *     | frm0 | frm0 |  frame1...   |
+	 *     +------+------+--------------+
+	 *     ^      ^      ^              ^
+         *     0    xoff  2*xoff       size+2*xoff 
+	 */
+	dst_buf = resample->buffer + resample->xoff*2;
+	for (i=0; i<resample->frame_size; ++i)
+	    dst_buf[i] = input[i];
+	    
+	if (resample->factor >= 1) {
+
+	    if (resample->large_filter) {
+		SrcUp(resample->buffer + resample->xoff, output,
+		      resample->factor, resample->frame_size,
+		      LARGE_FILTER_NWING, LARGE_FILTER_SCALE,
+		      LARGE_FILTER_IMP, LARGE_FILTER_IMPD,
+		      PJ_TRUE);
+	    } else {
+		SrcUp(resample->buffer + resample->xoff, output,
+		      resample->factor, resample->frame_size,
+		      SMALL_FILTER_NWING, SMALL_FILTER_SCALE,
+		      SMALL_FILTER_IMP, SMALL_FILTER_IMPD,
+		      PJ_TRUE);
+	    }
+
+	} else {
+
+	    if (resample->large_filter) {
+
+		SrcUD( resample->buffer + resample->xoff, output,
+		       resample->factor, resample->frame_size,
+		       LARGE_FILTER_NWING, 
+		       LARGE_FILTER_SCALE * resample->factor + 0.5,
+		       LARGE_FILTER_IMP, LARGE_FILTER_IMPD,
+		       PJ_TRUE);
+
+	    } else {
+
+		SrcUD( resample->buffer + resample->xoff, output,
+		       resample->factor, resample->frame_size,
+		       SMALL_FILTER_NWING, 
+		       SMALL_FILTER_SCALE * resample->factor + 0.5,
+		       SMALL_FILTER_IMP, SMALL_FILTER_IMPD,
+		       PJ_TRUE);
+
+	    }
+
+	}
+
+	dst_buf = resample->buffer;
+	src_buf = input + resample->frame_size - resample->xoff*2;
+	for (i=0; i<resample->xoff * 2; ++i) {
+	    dst_buf[i] = src_buf[i];
+	}
+
+    } else {
+	SrcLinear( input, output, resample->factor, resample->frame_size);
+    }
+}
diff --git a/pjmedia/src/pjmedia/smallfilter.h b/pjmedia/src/pjmedia/smallfilter.h
new file mode 100644
index 00000000..6f6f0f84
--- /dev/null
+++ b/pjmedia/src/pjmedia/smallfilter.h
@@ -0,0 +1,4617 @@
+/* Included by resamplesubs.c */
+#define SMALL_FILTER_NMULT ((HWORD)13)
+#define SMALL_FILTER_SCALE 13128 /* Unity-gain scale factor */
+#define SMALL_FILTER_NWING 1536 /* Filter table length */
+static HWORD SMALL_FILTER_IMP[] /* Impulse response */ = {
+32767,
+32766,
+32764,
+32760,
+32755,
+32749,
+32741,
+32731,
+32721,
+32708,
+32695,
+32679,
+32663,
+32645,
+32625,
+32604,
+32582,
+32558,
+32533,
+32506,
+32478,
+32448,
+32417,
+32385,
+32351,
+32316,
+32279,
+32241,
+32202,
+32161,
+32119,
+32075,
+32030,
+31984,
+31936,
+31887,
+31836,
+31784,
+31731,
+31676,
+31620,
+31563,
+31504,
+31444,
+31383,
+31320,
+31256,
+31191,
+31124,
+31056,
+30987,
+30916,
+30845,
+30771,
+30697,
+30621,
+30544,
+30466,
+30387,
+30306,
+30224,
+30141,
+30057,
+29971,
+29884,
+29796,
+29707,
+29617,
+29525,
+29433,
+29339,
+29244,
+29148,
+29050,
+28952,
+28852,
+28752,
+28650,
+28547,
+28443,
+28338,
+28232,
+28125,
+28017,
+27908,
+27797,
+27686,
+27574,
+27461,
+27346,
+27231,
+27115,
+26998,
+26879,
+26760,
+26640,
+26519,
+26398,
+26275,
+26151,
+26027,
+25901,
+25775,
+25648,
+25520,
+25391,
+25262,
+25131,
+25000,
+24868,
+24735,
+24602,
+24467,
+24332,
+24197,
+24060,
+23923,
+23785,
+23647,
+23507,
+23368,
+23227,
+23086,
+22944,
+22802,
+22659,
+22515,
+22371,
+22226,
+22081,
+21935,
+21789,
+21642,
+21494,
+21346,
+21198,
+21049,
+20900,
+20750,
+20600,
+20449,
+20298,
+20146,
+19995,
+19842,
+19690,
+19537,
+19383,
+19230,
+19076,
+18922,
+18767,
+18612,
+18457,
+18302,
+18146,
+17990,
+17834,
+17678,
+17521,
+17365,
+17208,
+17051,
+16894,
+16737,
+16579,
+16422,
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diff --git a/pjsip-apps/src/pjsua/main.c b/pjsip-apps/src/pjsua/main.c
index 08f0a380..1b0074b4 100644
--- a/pjsip-apps/src/pjsua/main.c
+++ b/pjsip-apps/src/pjsua/main.c
@@ -384,8 +384,10 @@ static void conf_list(void)
 		pj_ansi_strcat(txlist, s);
 	    }
 	}
-	printf("Port #%02d %20.*s  transmitting to: %s\n", 
+	printf("Port #%02d[%2dKHz/%dms] %20.*s  transmitting to: %s\n", 
 	       port_info->slot, 
+	       port_info->clock_rate/1000,
+	       port_info->samples_per_frame * 1000 / port_info->clock_rate,
 	       (int)port_info->name.slen, 
 	       port_info->name.ptr,
 	       txlist);
diff --git a/pjsip/include/pjsua-lib/pjsua.h b/pjsip/include/pjsua-lib/pjsua.h
index d120a062..1ed8f3af 100644
--- a/pjsip/include/pjsua-lib/pjsua.h
+++ b/pjsip/include/pjsua-lib/pjsua.h
@@ -177,6 +177,7 @@ struct pjsua
     /* Media:  */
     int		     start_rtp_port;/**< Start of RTP port to try.	*/
     pjmedia_endpt   *med_endpt;	    /**< Media endpoint.		*/
+    unsigned	     clock_rate;    /**< Internal clock rate.		*/
     pjmedia_conf    *mconf;	    /**< Media conference.		*/
     pj_bool_t	     null_audio;    /**< Null audio flag.		*/
     char	    *wav_file;	    /**< WAV file name to play.		*/
diff --git a/pjsip/src/pjsua-lib/pjsua_core.c b/pjsip/src/pjsua-lib/pjsua_core.c
index 081a3a87..e944ea42 100644
--- a/pjsip/src/pjsua-lib/pjsua_core.c
+++ b/pjsip/src/pjsua-lib/pjsua_core.c
@@ -72,6 +72,9 @@ void pjsua_default(void)
     /* Default: do not use STUN: */
     pjsua.stun_port1 = pjsua.stun_port2 = 0;
 
+    /* Default: sampling rate is 8000 */
+    pjsua.clock_rate = 8000;
+
     /* Init accounts: */
     pjsua.acc_cnt = 1;
     for (i=0; i<PJ_ARRAY_SIZE(pjsua.acc); ++i) {
@@ -618,7 +621,9 @@ pj_status_t pjsua_start(void)
 
     status = pjmedia_conf_create(pjsua.pool, 
 				 pjsua.max_calls+PJSUA_CONF_MORE_PORTS, 
-				 8000, 160, 16, &pjsua.mconf);
+				 pjsua.clock_rate, 
+				 pjsua.clock_rate * 20 / 1000, 16, 
+				 &pjsua.mconf);
     if (status != PJ_SUCCESS) {
 	pj_caching_pool_destroy(&pjsua.cp);
 	pjsua_perror(THIS_FILE, 
diff --git a/pjsip/src/pjsua-lib/pjsua_settings.c b/pjsip/src/pjsua-lib/pjsua_settings.c
index e861f5c6..9e1d3ff8 100644
--- a/pjsip/src/pjsua-lib/pjsua_settings.c
+++ b/pjsip/src/pjsua-lib/pjsua_settings.c
@@ -83,6 +83,8 @@ static void usage(void)
     puts("  --use-stun2=host[:port]  Resolve local IP with the specified STUN servers");
     puts("");
     puts("Media Options:");
+    puts("  --wb                Enable wideband codecs (16KHz)");
+    puts("  --uwb               Enable ultra-wideband codecs (32KHz)");
     puts("  --null-audio        Use NULL audio device");
     puts("  --play-file=file    Play WAV file in conference bridge");
     puts("  --auto-play         Automatically play the file (to incoming calls only)");
@@ -218,7 +220,7 @@ pj_status_t pjsua_parse_args(int argc, char *argv[])
 	   OPT_ADD_BUDDY, OPT_OFFER_X_MS_MSG, OPT_NO_PRESENCE,
 	   OPT_AUTO_ANSWER, OPT_AUTO_HANGUP, OPT_AUTO_PLAY, OPT_AUTO_LOOP,
 	   OPT_AUTO_CONF,
-	   OPT_PLAY_FILE, OPT_RTP_PORT,
+	   OPT_PLAY_FILE, OPT_WB, OPT_UWB, OPT_RTP_PORT,
 	   OPT_NEXT_ACCOUNT, OPT_NEXT_CRED, OPT_MAX_CALLS,
     };
     struct option long_options[] = {
@@ -228,6 +230,8 @@ pj_status_t pjsua_parse_args(int argc, char *argv[])
 	{ "app-log-level",1,0,OPT_APP_LOG_LEVEL},
 	{ "help",	0, 0, OPT_HELP},
 	{ "version",	0, 0, OPT_VERSION},
+	{ "wb",		0, 0, OPT_WB},
+	{ "uwb",	0, 0, OPT_UWB},
 	{ "null-audio", 0, 0, OPT_NULL_AUDIO},
 	{ "local-port", 1, 0, OPT_LOCAL_PORT},
 	{ "proxy",	1, 0, OPT_PROXY},
@@ -327,6 +331,14 @@ pj_status_t pjsua_parse_args(int argc, char *argv[])
 	    pjsua.null_audio = 1;
 	    break;
 
+	case OPT_WB:
+	    pjsua.clock_rate = 16000;
+	    break;
+
+	case OPT_UWB:
+	    pjsua.clock_rate = 32000;
+	    break;
+
 	case OPT_LOCAL_PORT:   /* local-port */
 	    lval = pj_strtoul(pj_cstr(&tmp, optarg));
 	    if (lval < 1 || lval > 65535) {