libpurple/media-gst.h

/* purple
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 */

#ifndef _PURPLE_MEDIA_GST_H_
#define _PURPLE_MEDIA_GST_H_
/**
 * SECTION:media-gst
 * @section_id: libpurple-media-gst
 * @short_description: <filename>media-gst.h</filename>
 * @title: Media Element API
 */

#include "media.h"
#include "mediamanager.h"

#include <gst/gst.h>

#define PURPLE_TYPE_MEDIA_ELEMENT_TYPE           (purple_media_element_type_get_type())
#define PURPLE_TYPE_MEDIA_ELEMENT_INFO           (purple_media_element_info_get_type())
#define PURPLE_MEDIA_ELEMENT_INFO(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), PURPLE_TYPE_MEDIA_ELEMENT_INFO, PurpleMediaElementInfo))
#define PURPLE_MEDIA_ELEMENT_INFO_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), PURPLE_TYPE_MEDIA_ELEMENT_INFO, PurpleMediaElementInfo))
#define PURPLE_IS_MEDIA_ELEMENT_INFO(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), PURPLE_TYPE_MEDIA_ELEMENT_INFO))
#define PURPLE_IS_MEDIA_ELEMENT_INFO_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), PURPLE_TYPE_MEDIA_ELEMENT_INFO))
#define PURPLE_MEDIA_ELEMENT_INFO_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj), PURPLE_TYPE_MEDIA_ELEMENT_INFO, PurpleMediaElementInfo))

/**
 * PurpleMediaElementInfo:
 *
 * An opaque structure representing an audio/video source/sink.
 */
typedef struct _PurpleMediaElementInfo PurpleMediaElementInfo;
typedef struct _PurpleMediaElementInfoClass PurpleMediaElementInfoClass;

typedef GstElement *(*PurpleMediaElementCreateCallback)(
		PurpleMediaElementInfo *info, PurpleMedia *media,
		const gchar *session_id, const gchar *participant);

/**
 * PurpleMediaElementType:
 * @PURPLE_MEDIA_ELEMENT_NONE:         empty element
 * @PURPLE_MEDIA_ELEMENT_AUDIO:        supports audio
 * @PURPLE_MEDIA_ELEMENT_VIDEO:        supports video
 * @PURPLE_MEDIA_ELEMENT_AUDIO_VIDEO:  supports audio and video
 * @PURPLE_MEDIA_ELEMENT_NO_SRCS:      has no src pads
 * @PURPLE_MEDIA_ELEMENT_ONE_SRC:      has one src pad
 * @PURPLE_MEDIA_ELEMENT_MULTI_SRC:    has multiple src pads
 * @PURPLE_MEDIA_ELEMENT_REQUEST_SRC:  src pads must be requested
 * @PURPLE_MEDIA_ELEMENT_NO_SINKS:     has no sink pads
 * @PURPLE_MEDIA_ELEMENT_ONE_SINK:     has one sink pad
 * @PURPLE_MEDIA_ELEMENT_MULTI_SINK:   has multiple sink pads
 * @PURPLE_MEDIA_ELEMENT_REQUEST_SINK: sink pads must be requested
 * @PURPLE_MEDIA_ELEMENT_UNIQUE:       This element is unique and only one
 *                                     instance of it should be created at a
 *                                     time
 * @PURPLE_MEDIA_ELEMENT_SRC:          can be set as an active src
 * @PURPLE_MEDIA_ELEMENT_SINK:         can be set as an active sink
 * @PURPLE_MEDIA_ELEMENT_APPLICATION:  supports application data
 */
typedef enum {
	PURPLE_MEDIA_ELEMENT_NONE = 0,
	PURPLE_MEDIA_ELEMENT_AUDIO = 1,
	PURPLE_MEDIA_ELEMENT_VIDEO = 1 << 1,
	PURPLE_MEDIA_ELEMENT_AUDIO_VIDEO = PURPLE_MEDIA_ELEMENT_AUDIO
			| PURPLE_MEDIA_ELEMENT_VIDEO,
	PURPLE_MEDIA_ELEMENT_NO_SRCS = 0,
	PURPLE_MEDIA_ELEMENT_ONE_SRC = 1 << 2,
	PURPLE_MEDIA_ELEMENT_MULTI_SRC = 1 << 3,
	PURPLE_MEDIA_ELEMENT_REQUEST_SRC = 1 << 4,
	PURPLE_MEDIA_ELEMENT_NO_SINKS = 0,
	PURPLE_MEDIA_ELEMENT_ONE_SINK = 1 << 5,
	PURPLE_MEDIA_ELEMENT_MULTI_SINK = 1 << 6,
	PURPLE_MEDIA_ELEMENT_REQUEST_SINK = 1 << 7,
	PURPLE_MEDIA_ELEMENT_UNIQUE = 1 << 8,
	PURPLE_MEDIA_ELEMENT_SRC = 1 << 9,
	PURPLE_MEDIA_ELEMENT_SINK = 1 << 10,
	PURPLE_MEDIA_ELEMENT_APPLICATION = 1 << 11,
} PurpleMediaElementType;

G_BEGIN_DECLS

/**
 * purple_media_element_type_get_type:
 *
 * Gets the element type's GType.
 *
 * Returns: The element type's GType.
 */
GType purple_media_element_type_get_type(void);

/**
 * purple_media_element_info_get_type:
 *
 * Gets the element info's GType.
 *
 * Returns: The element info's GType.
 */
GType purple_media_element_info_get_type(void);

/**
 * purple_media_get_src:
 * @media: The media object the session is in.
 * @sess_id: The session id of the session to get the source from.
 *
 * Gets the source from a session
 *
 * Returns: The source retrieved.
 */
GstElement *purple_media_get_src(PurpleMedia *media, const gchar *sess_id);

/**
 * purple_media_get_tee:
 * @media: The instance to get the tee from.
 * @session_id: The id of the session to get the tee from.
 * @participant: Optionally, the participant of the stream to get the tee from.
 *
 * Gets the tee from a given session/stream.
 *
 * Returns: The GstTee element from the chosen session/stream.
 */
GstElement *purple_media_get_tee(PurpleMedia *media,
		const gchar *session_id, const gchar *participant);


/**
 * purple_media_manager_get_pipeline:
 * @manager: The media manager to get the pipeline from.
 *
 * Gets the pipeline from the media manager.
 *
 * Returns: The pipeline.
 */
GstElement *purple_media_manager_get_pipeline(PurpleMediaManager *manager);

/**
 * purple_media_manager_get_element:
 * @manager: The media manager to use to obtain the source/sink.
 * @type: The type of source/sink to get.
 * @media: The media call this element is requested for.
 * @session_id: The id of the session this element is requested for or NULL.
 * @participant: The remote user this element is requested for or NULL.
 *
 * Returns: A GStreamer source or sink for audio or video.
 */
GstElement *purple_media_manager_get_element(PurpleMediaManager *manager,
		PurpleMediaSessionType type, PurpleMedia *media,
		const gchar *session_id, const gchar *participant);

/**
 * purple_media_manager_enumerate_elements:
 * @manager: The media manager to use to obtain the element infos.
 * @type: The type of element infos to get.
 *
 * Returns: A #GList of registered #PurpleMediaElementInfo instances that match
 * @type.
 */
GList *purple_media_manager_enumerate_elements(PurpleMediaManager *manager,
		PurpleMediaElementType type);

PurpleMediaElementInfo *purple_media_manager_get_element_info(
		PurpleMediaManager *manager, const gchar *name);
gboolean purple_media_manager_register_element(PurpleMediaManager *manager,
		PurpleMediaElementInfo *info);
gboolean purple_media_manager_unregister_element(PurpleMediaManager *manager,
		const gchar *name);
gboolean purple_media_manager_set_active_element(PurpleMediaManager *manager,
		PurpleMediaElementInfo *info);
PurpleMediaElementInfo *purple_media_manager_get_active_element(
		PurpleMediaManager *manager, PurpleMediaElementType type);

/**
 * purple_media_manager_set_video_caps:
 * @manager: The media manager to set the media formats.
 * @caps: Set of allowed media formats.
 *
 * Reduces media formats supported by the video source to given set.
 *
 * Useful to force negotiation of smaller picture resolution more suitable for
 * use with particular codec and communication protocol without rescaling.
 */
void purple_media_manager_set_video_caps(PurpleMediaManager *manager,
		GstCaps *caps);

/**
 * purple_media_manager_get_video_caps:
 * @manager: The media manager to get the media formats from.
 *
 * Returns current set of media formats limiting the output from video source.
 *
 * Returns: #GstCaps limiting the video source's formats.
 */
GstCaps *purple_media_manager_get_video_caps(PurpleMediaManager *manager);

gchar *purple_media_element_info_get_id(PurpleMediaElementInfo *info);
gchar *purple_media_element_info_get_name(PurpleMediaElementInfo *info);
PurpleMediaElementType purple_media_element_info_get_element_type(
		PurpleMediaElementInfo *info);
GstElement *purple_media_element_info_call_create(
		PurpleMediaElementInfo *info, PurpleMedia *media,
		const gchar *session_id, const gchar *participant);

G_END_DECLS

#endif  /* _PURPLE_MEDIA_GST_H_ */