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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_SOUND_PORT_H__
+#define __PJMEDIA_SOUND_PORT_H__
+
+/**
+ * @file sound_port.h
+ * @brief Media port connection abstraction to sound device.
+ */
+#include <pjmedia-audiodev/audiodev.h>
+#include <pjmedia/clock.h>
+#include <pjmedia/port.h>
+
+PJ_BEGIN_DECL
+
+/**
+ * @defgroup PJMED_SND_PORT Sound Device Port
+ * @ingroup PJMEDIA_PORT_CLOCK
+ * @brief Media Port Connection Abstraction to the Sound Device
+ @{
+
+ As explained in @ref PJMED_SND, the sound hardware abstraction provides
+ some callbacks for its user:
+ - it calls <b><tt>rec_cb</tt></b> callback when it has finished capturing
+   one media frame, and 
+ - it calls <b><tt>play_cb</tt></b> when it needs media frame to be 
+   played to the sound playback hardware.
+
+ The @ref PJMED_SND_PORT (the object being explained here) add a
+ thin wrapper to the hardware abstraction:
+ - it will call downstream port's <tt>put_frame()</tt>
+   when <b><tt>rec_cb()</tt></b> is called (i.e. when the sound hardware 
+   has finished capturing frame), and 
+ - it will call downstream port's <tt>get_frame()</tt> when 
+   <b><tt>play_cb()</tt></b> is called (i.e. every time the 
+   sound hardware needs more frames to be played to the playback hardware).
+
+ This simple abstraction enables media to flow automatically (and
+ in timely manner) from the downstream media port to the sound device.
+ In other words, the sound device port supplies media clock to
+ the ports. The media clock concept is explained in @ref PJMEDIA_PORT_CLOCK
+ section.
+
+ Application registers downstream port to the sound device port by
+ calling #pjmedia_snd_port_connect();
+ 
+ */
+
+/**
+ * Sound port options.
+ */
+enum pjmedia_snd_port_option
+{
+    /** 
+     * Don't start the audio device when creating a sound port.
+     */    
+    PJMEDIA_SND_PORT_NO_AUTO_START = 1
+};
+
+/**
+ * This structure specifies the parameters to create the sound port.
+ * Use pjmedia_snd_port_param_default() to initialize this structure with
+ * default values (mostly zeroes)
+ */
+typedef struct pjmedia_snd_port_param
+{
+    /**
+     * Base structure.
+     */
+    pjmedia_aud_param base;
+    
+    /**
+     * Sound port creation options.
+     */
+    unsigned options;
+
+    /**
+     * Echo cancellation options/flags.
+     */
+    unsigned ec_options;
+
+} pjmedia_snd_port_param;
+
+/**
+ * Initialize pjmedia_snd_port_param with default values.
+ *
+ * @param prm		    The parameter.
+ */
+PJ_DECL(void) pjmedia_snd_port_param_default(pjmedia_snd_port_param *prm);
+
+/**
+ * This opaque type describes sound device port connection.
+ * Sound device port is not a media port, but it is used to connect media
+ * port to the sound device.
+ */
+typedef struct pjmedia_snd_port pjmedia_snd_port;
+
+
+/**
+ * Create bidirectional sound port for both capturing and playback of
+ * audio samples.
+ *
+ * @param pool		    Pool to allocate sound port structure.
+ * @param rec_id	    Device index for recorder/capture stream, or
+ *			    -1 to use the first capable device.
+ * @param play_id	    Device index for playback stream, or -1 to use 
+ *			    the first capable device.
+ * @param clock_rate	    Sound device's clock rate to set.
+ * @param channel_count	    Set number of channels, 1 for mono, or 2 for
+ *			    stereo. The channel count determines the format
+ *			    of the frame.
+ * @param samples_per_frame Number of samples per frame.
+ * @param bits_per_sample   Set the number of bits per sample. The normal 
+ *			    value for this parameter is 16 bits per sample.
+ * @param options	    Options flag.
+ * @param p_port	    Pointer to receive the sound device port instance.
+ *
+ * @return		    PJ_SUCCESS on success, or the appropriate error
+ *			    code.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_create( pj_pool_t *pool,
+					      int rec_id,
+					      int play_id,
+					      unsigned clock_rate,
+					      unsigned channel_count,
+					      unsigned samples_per_frame,
+					      unsigned bits_per_sample,
+					      unsigned options,
+					      pjmedia_snd_port **p_port);
+
+/**
+ * Create unidirectional sound device port for capturing audio streams from 
+ * the sound device with the specified parameters.
+ *
+ * @param pool		    Pool to allocate sound port structure.
+ * @param index		    Device index, or -1 to let the library choose the 
+ *			    first available device.
+ * @param clock_rate	    Sound device's clock rate to set.
+ * @param channel_count	    Set number of channels, 1 for mono, or 2 for
+ *			    stereo. The channel count determines the format
+ *			    of the frame.
+ * @param samples_per_frame Number of samples per frame.
+ * @param bits_per_sample   Set the number of bits per sample. The normal 
+ *			    value for this parameter is 16 bits per sample.
+ * @param options	    Options flag.
+ * @param p_port	    Pointer to receive the sound device port instance.
+ *
+ * @return		    PJ_SUCCESS on success, or the appropriate error
+ *			    code.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_create_rec(pj_pool_t *pool,
+						 int index,
+						 unsigned clock_rate,
+						 unsigned channel_count,
+						 unsigned samples_per_frame,
+						 unsigned bits_per_sample,
+						 unsigned options,
+						 pjmedia_snd_port **p_port);
+					      
+/**
+ * Create unidirectional sound device port for playing audio streams with the 
+ * specified parameters.
+ *
+ * @param pool		    Pool to allocate sound port structure.
+ * @param index		    Device index, or -1 to let the library choose the 
+ *			    first available device.
+ * @param clock_rate	    Sound device's clock rate to set.
+ * @param channel_count	    Set number of channels, 1 for mono, or 2 for
+ *			    stereo. The channel count determines the format
+ *			    of the frame.
+ * @param samples_per_frame Number of samples per frame.
+ * @param bits_per_sample   Set the number of bits per sample. The normal 
+ *			    value for this parameter is 16 bits per sample.
+ * @param options	    Options flag.
+ * @param p_port	    Pointer to receive the sound device port instance.
+ *
+ * @return		    PJ_SUCCESS on success, or the appropriate error
+ *			    code.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_create_player(pj_pool_t *pool,
+						    int index,
+						    unsigned clock_rate,
+						    unsigned channel_count,
+						    unsigned samples_per_frame,
+						    unsigned bits_per_sample,
+						    unsigned options,
+						    pjmedia_snd_port **p_port);
+
+
+/**
+ * Create sound device port according to the specified parameters.
+ *
+ * @param pool		    Pool to allocate sound port structure.
+ * @param prm		    Sound port parameter.
+ * @param p_port	    Pointer to receive the sound device port instance.
+ *
+ * @return		    PJ_SUCCESS on success, or the appropriate error
+ *			    code.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_create2(pj_pool_t *pool,
+					      const pjmedia_snd_port_param *prm,
+					      pjmedia_snd_port **p_port);
+
+
+/**
+ * Destroy sound device port.
+ *
+ * @param snd_port	    The sound device port.
+ *
+ * @return		    PJ_SUCCESS on success, or the appropriate error
+ *			    code.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_destroy(pjmedia_snd_port *snd_port);
+
+
+/**
+ * Retrieve the sound stream associated by this sound device port.
+ *
+ * @param snd_port	    The sound device port.
+ *
+ * @return		    The sound stream instance.
+ */
+PJ_DECL(pjmedia_aud_stream*) pjmedia_snd_port_get_snd_stream(
+						pjmedia_snd_port *snd_port);
+
+
+/**
+ * Change the echo cancellation settings. The echo cancellation settings 
+ * should have been specified when this sound port was created, by setting
+ * the appropriate fields in the pjmedia_aud_param, because not all sound
+ * device implementation supports changing the EC setting once the device
+ * has been opened.
+ *
+ * The behavior of this function depends on whether device or software AEC
+ * is being used. If the device supports AEC, this function will forward
+ * the change request to the device and it will be up to the device whether
+ * to support the request. If software AEC is being used (the software EC
+ * will be used if the device does not support AEC), this function will
+ * change the software EC settings.
+ *
+ * @param snd_port	    The sound device port.
+ * @param pool		    Pool to re-create the echo canceller if necessary.
+ * @param tail_ms	    Maximum echo tail length to be supported, in
+ *			    miliseconds. If zero is specified, the EC would
+ *			    be disabled.
+ * @param options	    The options to be passed to #pjmedia_echo_create().
+ *			    This is only used if software EC is being used.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_set_ec( pjmedia_snd_port *snd_port,
+					      pj_pool_t *pool,
+					      unsigned tail_ms,
+					      unsigned options);
+
+
+/**
+ * Get current echo canceller tail length, in miliseconds. The tail length 
+ * will be zero if EC is not enabled.
+ *
+ * @param snd_port	    The sound device port.
+ * @param p_length	    Pointer to receive the tail length.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_get_ec_tail(pjmedia_snd_port *snd_port,
+						  unsigned *p_length);
+
+
+/**
+ * Get a clock source from the sound port.
+ *
+ * @param snd_port  The sound port.
+ * @param dir       Sound port's direction.
+ *
+ * @return	    The clock source.
+ */
+PJ_DECL(pjmedia_clock_src *)
+pjmedia_snd_port_get_clock_src( pjmedia_snd_port *snd_port,
+                                pjmedia_dir dir );
+
+
+/**
+ * Connect a port to the sound device port. If the sound device port has a
+ * sound recorder device, then this will start periodic function call to
+ * the port's put_frame() function. If the sound device has a sound player
+ * device, then this will start periodic function call to the port's
+ * get_frame() function.
+ *
+ * For this version of PJMEDIA, the media port MUST have the same audio
+ * settings as the sound device port, or otherwise the connection will
+ * fail. This means the port MUST have the same clock_rate, channel count,
+ * samples per frame, and bits per sample as the sound device port.
+ *
+ * @param snd_port	    The sound device port.
+ * @param port		    The media port to be connected.
+ *
+ * @return		    PJ_SUCCESS on success, or the appropriate error
+ *			    code.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_connect(pjmedia_snd_port *snd_port,
+					      pjmedia_port *port);
+
+
+/**
+ * Retrieve the port instance currently attached to the sound port, if any.
+ *
+ * @param snd_port	    The sound device port.
+ *
+ * @return		    The port instance currently attached to the 
+ *			    sound device port, or NULL if there is no port
+ *			    currently attached to the sound device port.
+ */
+PJ_DECL(pjmedia_port*) pjmedia_snd_port_get_port(pjmedia_snd_port *snd_port);
+
+
+/**
+ * Disconnect currently attached port from the sound device port.
+ *
+ * @param snd_port	    The sound device port.
+ *
+ * @return		    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_snd_port_disconnect(pjmedia_snd_port *snd_port);
+
+
+/**
+ * @}
+ */
+
+PJ_END_DECL
+
+
+#endif	/* __PJMEDIA_SOUND_PORT_H__ */
+