/* GStreamer * Copyright (C) 2004 Wim Taymans * * gstmessage.h: Header for GstMessage subsystem * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_MESSAGE_H__ #define __GST_MESSAGE_H__ G_BEGIN_DECLS typedef struct _GstMessage GstMessage; typedef struct _GstMessageClass GstMessageClass; /** * GstMessageType: * @GST_MESSAGE_UNKNOWN: an undefined message * @GST_MESSAGE_EOS: end-of-stream reached in a pipeline * @GST_MESSAGE_ERROR: an error occured * @GST_MESSAGE_WARNING: a warning occured. * @GST_MESSAGE_INFO: an info message occured * @GST_MESSAGE_TAG: a tag was found. * @GST_MESSAGE_BUFFERING: the pipeline is buffering * @GST_MESSAGE_STATE_CHANGED: a state change happened * @GST_MESSAGE_STEP_DONE: a framestep finished. * @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline * @GST_MESSAGE_STRUCTURE_CHANGE: the structure of the pipeline changed. * @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts, * stops, errors, etc.. * @GST_MESSAGE_APPLICATION: message posted by the application, possibly * via an application-specific element. * @GST_MESSAGE_SEGMENT_START: pipeline started playback of a segment. * @GST_MESSAGE_SEGMENT_DONE: pipeline completed playback of a segment. * @GST_MESSAGE_ANY: mask for all of the above messages. */ typedef enum { GST_MESSAGE_UNKNOWN = 0, GST_MESSAGE_EOS = (1 << 0), GST_MESSAGE_ERROR = (1 << 1), GST_MESSAGE_WARNING = (1 << 2), GST_MESSAGE_INFO = (1 << 3), GST_MESSAGE_TAG = (1 << 4), GST_MESSAGE_BUFFERING = (1 << 5), GST_MESSAGE_STATE_CHANGED = (1 << 6), GST_MESSAGE_STEP_DONE = (1 << 7), GST_MESSAGE_NEW_CLOCK = (1 << 8), GST_MESSAGE_STRUCTURE_CHANGE = (1 << 9), GST_MESSAGE_STREAM_STATUS = (1 << 10), GST_MESSAGE_APPLICATION = (1 << 11), GST_MESSAGE_SEGMENT_START = (1 << 12), GST_MESSAGE_SEGMENT_DONE = (1 << 13), GST_MESSAGE_ANY = 0xffffffff } GstMessageType; #include #include #include #include #include #define GST_MESSAGE_TRACE_NAME "GstMessage" #define GST_TYPE_MESSAGE (gst_message_get_type()) #define GST_IS_MESSAGE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MESSAGE)) #define GST_IS_MESSAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MESSAGE)) #define GST_MESSAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_MESSAGE, GstMessageClass)) #define GST_MESSAGE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MESSAGE, GstMessage)) #define GST_MESSAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MESSAGE, GstMessageClass)) /* the lock is used to handle the synchronous handling of messages, * the emiting thread is block until the handling thread processed * the message using this mutex/cond pair */ #define GST_MESSAGE_GET_LOCK(message) (GST_MESSAGE(message)->lock) #define GST_MESSAGE_LOCK(message) g_mutex_lock(GST_MESSAGE_GET_LOCK(message)) #define GST_MESSAGE_UNLOCK(message) g_mutex_unlock(GST_MESSAGE_GET_LOCK(message)) #define GST_MESSAGE_COND(message) (GST_MESSAGE(message)->cond) #define GST_MESSAGE_WAIT(message) g_cond_wait(GST_MESSAGE_COND(message),GST_MESSAGE_GET_LOCK(message)) #define GST_MESSAGE_SIGNAL(message) g_cond_signal(GST_MESSAGE_COND(message)) #define GST_MESSAGE_TYPE(message) (GST_MESSAGE(message)->type) #define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE(message)->timestamp) #define GST_MESSAGE_SRC(message) (GST_MESSAGE(message)->src) struct _GstMessage { GstMiniObject mini_object; /*< public > *//* with MESSAGE_LOCK */ GMutex *lock; /* lock and cond for async delivery */ GCond *cond; /*< public > *//* with COW */ GstMessageType type; guint64 timestamp; GstObject *src; GstStructure *structure; /*< private > */ gpointer _gst_reserved[GST_PADDING]; }; struct _GstMessageClass { GstMiniObjectClass mini_object_class; /*< private > */ gpointer _gst_reserved[GST_PADDING]; }; void _gst_message_initialize (void); GType gst_message_get_type (void); /* refcounting */ #define gst_message_ref(msg) GST_MESSAGE (gst_mini_object_ref (GST_MINI_OBJECT (msg))) #define gst_message_unref(msg) gst_mini_object_unref (GST_MINI_OBJECT (msg)) /* copy message */ #define gst_message_copy(msg) GST_MESSAGE (gst_mini_object_copy (GST_MINI_OBJECT (msg))) #define gst_message_make_writable(msg) GST_MESSAGE (gst_mini_object_make_writable (GST_MINI_OBJECT (msg))) GstMessage * gst_message_new_eos (GstObject * src); GstMessage * gst_message_new_error (GstObject * src, GError * error, gchar * debug); GstMessage * gst_message_new_warning (GstObject * src, GError * error, gchar * debug); GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list); GstMessage * gst_message_new_state_changed (GstObject * src, GstState old_state, GstState new_state); GstMessage * gst_message_new_segment_start (GstObject * src, GstClockTime timestamp); GstMessage * gst_message_new_segment_done (GstObject * src, GstClockTime timestamp); GstMessage * gst_message_new_custom (GstMessageType type, GstObject * src, GstStructure * structure); /** * gst_message_new_application: * @src: The object originating the message. * @str: The structure for the message. The message will take ownership of * the structure. * * Create a new application-typed message. This can be used for anything not * handled by other message-specific functions to pass a message to the * app. The structure field can be NULL. * * Returns: The new message. * * MT safe. */ #define gst_message_new_application(src, str) \ gst_message_new_custom (GST_MESSAGE_APPLICATION, src, str) void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug); void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug); void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list); void gst_message_parse_state_changed (GstMessage *message, GstState *old_state, GstState *new_state); void gst_message_parse_segment_start (GstMessage *message, GstClockTime *timestamp); void gst_message_parse_segment_done (GstMessage *message, GstClockTime *timestamp); const GstStructure * gst_message_get_structure (GstMessage *message); G_END_DECLS #endif /* __GST_MESSAGE_H__ */