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+/* $Id$ */
+/*
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ *
+ * 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_VIDPORT_H__
+#define __PJMEDIA_VIDPORT_H__
+
+/**
+ * @file pjmedia/videoport.h Video media port
+ * @brief Video media port
+ */
+
+#include <pjmedia-videodev/videodev.h>
+#include <pjmedia/port.h>
+
+/**
+ * @defgroup PJMEDIA_VIDEO_PORT Video media port
+ * @ingroup PJMEDIA_PORT_CLOCK
+ * @brief Video media port
+ * @{
+ */
+
+PJ_BEGIN_DECL
+
+/**
+ * This structure describes the parameters to create a video port
+ */
+typedef struct pjmedia_vid_port_param
+{
+    /**
+     * Video stream parameter.
+     */
+    pjmedia_vid_dev_param	vidparam;
+
+    /**
+     * Specify whether the video port should use active or passive interface.
+     * If active interface is selected, the video port will perform as
+     * a media clock, automatically calls pjmedia_port_get_frame() and
+     * pjmedia_port_put_frame() of its slave port (depending on the direction
+     * that is specified when opening the video stream). If passive interface
+     * is selected, application can retrieve the media port of this video
+     * port by calling pjmedia_vid_port_get_passive_port(), and subsequently
+     * calls pjmedia_port_put_frame() or pjmedia_port_get_frame() to that
+     * media port.
+     *
+     * Default: PJ_TRUE
+     */
+    pj_bool_t		active;
+
+} pjmedia_vid_port_param;
+
+/**
+ * Opaque data type for video port.
+ */
+typedef struct pjmedia_vid_port pjmedia_vid_port;
+
+/**
+ * Initialize the parameter with the default values. Note that this typically
+ * would only fill the structure to zeroes unless they have different default
+ * values.
+ *
+ * @param prm	The parameter.
+ */
+PJ_DECL(void) pjmedia_vid_port_param_default(pjmedia_vid_port_param *prm);
+
+/**
+ * Create a video port with the specified parameter. When video port opens
+ * the video stream with different parameter than the requested values in
+ * the \a prm.vidparam argument, it will automatically do the necessary
+ * conversion.
+ *
+ * @param pool		Pool to allocate memory from.
+ * @param prm		The video port parameter.
+ * @param p_vp		Pointer to receive the result.
+ *
+ * @return		PJ_SUCCESS if video port has been created
+ * 			successfully, or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_vid_port_create(pj_pool_t *pool,
+					     const pjmedia_vid_port_param *prm,
+					     pjmedia_vid_port **p_vp);
+
+/**
+ * Set the callbacks of the video port's underlying video stream.
+ *
+ * @param vid_port	The video port.
+ * @param cb            Pointer to structure containing video stream
+ *                      callbacks.
+ * @param user_data     Arbitrary user data, which will be given back in the
+ *                      callbacks.
+ */
+PJ_DECL(void) pjmedia_vid_port_set_cb(pjmedia_vid_port *vid_port,
+				      const pjmedia_vid_dev_cb *cb,
+                                      void *user_data);
+
+/**
+ * Return the underlying video stream of the video port.
+ *
+ * @param vid_port	The video port.
+ *
+ * @return		The video stream.
+ */
+PJ_DECL(pjmedia_vid_dev_stream*)
+pjmedia_vid_port_get_stream(pjmedia_vid_port *vid_port);
+
+/**
+ * Return the (passive) media port of the video port. This operation
+ * is only valid for video ports created with passive interface selected.
+ * Retrieving the media port for active video ports may raise an
+ * assertion.
+ *
+ *  @param vid_port	The video port.
+ *
+ *  @return		The media port instance, or NULL.
+ */
+PJ_DECL(pjmedia_port*)
+pjmedia_vid_port_get_passive_port(pjmedia_vid_port *vid_port);
+
+/**
+ * Get a clock source from the video port.
+ *
+ * @param vid_port  The video port.
+ *
+ * @return	    The clock source.
+ */
+PJ_DECL(pjmedia_clock_src *)
+pjmedia_vid_port_get_clock_src( pjmedia_vid_port *vid_port );
+
+/**
+ * Set a clock source for the video port.
+ *
+ * @param vid_port  The video port.
+ * @param clocksrc  The clock source.
+ *
+ * @return	    PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t)
+pjmedia_vid_port_set_clock_src( pjmedia_vid_port *vid_port,
+                                pjmedia_clock_src *clocksrc );
+
+/**
+ * Connect the video port to a downstream (slave) media port. This operation
+ * is only valid for video ports created with active interface selected.
+ * Connecting a passive video port may raise an assertion.
+ *
+ * @param vid_port	The video port.
+ * @param port		A downstream media port to be connected to
+ * 			this video port.
+ * @param destroy	Specify if the downstream media port should also be
+ * 			destroyed by this video port when the video port
+ * 			is destroyed.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_vid_port_connect(pjmedia_vid_port *vid_port,
+					      pjmedia_port *port,
+					      pj_bool_t destroy);
+
+/**
+ * Disconnect the video port from its downstream (slave) media port, if any.
+ * This operation is only valid for video ports created with active interface
+ * selected, and assertion may be triggered if this is invoked on a passive
+ * video port.
+ *
+ * @param vid_port	The video port.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_vid_port_disconnect(pjmedia_vid_port *vid_port);
+
+/**
+ * Retrieve the media port currently connected as downstream media port of the
+ * specified video port. This operation is only valid for video ports created
+ * with active interface selected, and assertion may be triggered if this is
+ * invoked on a passive video port.
+ *
+ * @param vid_port	The video port.
+ *
+ * @return		Media port currently connected to the video port,
+ * 			if any.
+ */
+PJ_DECL(pjmedia_port*)
+pjmedia_vid_port_get_connected_port(pjmedia_vid_port *vid_port);
+
+/**
+ * Start the video port.
+ *
+ * @param vid_port	The video port.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_vid_port_start(pjmedia_vid_port *vid_port);
+
+/**
+ * Query whether the video port has been started.
+ *
+ * @param vid_port	The video port.
+ *
+ * @return		PJ_TRUE if the video port has been started.
+ */
+PJ_DECL(pj_bool_t) pjmedia_vid_port_is_running(pjmedia_vid_port *vid_port);
+
+/**
+ * Stop the video port.
+ *
+ * @param vid_port	The video port.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_vid_port_stop(pjmedia_vid_port *vid_port);
+
+/**
+ * Destroy the video port, along with its video stream. If the video port is
+ * an active one, this may also destroy the downstream media port, if the
+ * destroy flag is set when the media port is connected.
+ *
+ * @param vid_port	The video port.
+ */
+PJ_DECL(void) pjmedia_vid_port_destroy(pjmedia_vid_port *vid_port);
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+#endif /* __PJMEDIA_VIDPORT_H__ */
+