/* 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. The application will * only receive this message in the PLAYING state and every time it sets a * pipeline to PLAYING that is in the EOS state. The application can perform a * flushing seek in the pipeline, which will undo the EOS state again. * @GST_MESSAGE_ERROR: an error occured. Whe the application receives an error * message it should stop playback of the pipeline and not assume that more * data will be played. * @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. When the application * receives a buffering message in the PLAYING state for a non-live pipeline it * must PAUSE the pipeline until the buffering completes, when the percentage * field in the message is 100%. For live pipelines, no action must be * performed and the buffering percentage can be used to inform the user about * the progress. * @GST_MESSAGE_STATE_CHANGED: a state change happened * @GST_MESSAGE_STATE_DIRTY: an element changed state in a streaming thread. * This message is deprecated. * @GST_MESSAGE_STEP_DONE: a framestep finished. This message is not yet * implemented. * @GST_MESSAGE_CLOCK_PROVIDE: an element notifies its capability of providing * a clock. This message is used internally and * never forwarded to the application. * @GST_MESSAGE_CLOCK_LOST: The current clock as selected by the pipeline became * unusable. The pipeline will select a new clock on * the next PLAYING state change. * @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline. * @GST_MESSAGE_STRUCTURE_CHANGE: the structure of the pipeline changed. Not * implemented yet. * @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts, * stops, errors, etc.. Not implemented yet. * @GST_MESSAGE_APPLICATION: message posted by the application, possibly * via an application-specific element. * @GST_MESSAGE_ELEMENT: element-specific message, see the specific element's * documentation * @GST_MESSAGE_SEGMENT_START: pipeline started playback of a segment. This * message is used internally and never forwarded to the application. * @GST_MESSAGE_SEGMENT_DONE: pipeline completed playback of a segment. This * message is forwarded to the application after all elements that posted * @GST_MESSAGE_SEGMENT_START posted a GST_MESSAGE_SEGMENT_DONE message. * @GST_MESSAGE_DURATION: The duration of a pipeline changed. The application * can get the new duration with a duration query. * @GST_MESSAGE_ASYNC_START: Posted by elements when they start an ASYNC state * change. This message is not forwarded to the application but is used * internally. Since: 0.10.13. * @GST_MESSAGE_ASYNC_DONE: Posted by elements when they complete an ASYNC state * change. The application will only receive this message from the toplevel * pipeline. Since: 0.10.13 * @GST_MESSAGE_LATENCY: Posted by elements when their latency changes. The * pipeline will calculate and distribute a new latency. Since: 0.10.12 * @GST_MESSAGE_ANY: mask for all of the above messages. * * The different message types that are available. */ /* NOTE: keep in sync with quark registration in gstmessage.c * NOTE: keep GST_MESSAGE_ANY a valid gint to avoid compiler warnings. */ 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_STATE_DIRTY = (1 << 7), GST_MESSAGE_STEP_DONE = (1 << 8), GST_MESSAGE_CLOCK_PROVIDE = (1 << 9), GST_MESSAGE_CLOCK_LOST = (1 << 10), GST_MESSAGE_NEW_CLOCK = (1 << 11), GST_MESSAGE_STRUCTURE_CHANGE = (1 << 12), GST_MESSAGE_STREAM_STATUS = (1 << 13), GST_MESSAGE_APPLICATION = (1 << 14), GST_MESSAGE_ELEMENT = (1 << 15), GST_MESSAGE_SEGMENT_START = (1 << 16), GST_MESSAGE_SEGMENT_DONE = (1 << 17), GST_MESSAGE_DURATION = (1 << 18), GST_MESSAGE_LATENCY = (1 << 19), GST_MESSAGE_ASYNC_START = (1 << 20), GST_MESSAGE_ASYNC_DONE = (1 << 21), GST_MESSAGE_ANY = ~0 } GstMessageType; #include #include #include #include #include /** * GST_MESSAGE_TRACE_NAME: * * The name used for memory allocation tracing */ #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)) #define GST_MESSAGE_CAST(obj) ((GstMessage*)(obj)) /* 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)) /** * GST_MESSAGE_TYPE: * @message: a #GstMessage * * Get the #GstMessageType of @message. */ #define GST_MESSAGE_TYPE(message) (GST_MESSAGE(message)->type) /** * GST_MESSAGE_TYPE_NAME: * @message: a #GstMessage * * Get a constant string representation of the #GstMessageType of @message. * * Since: 0.10.4 */ #define GST_MESSAGE_TYPE_NAME(message) gst_message_type_get_name(GST_MESSAGE_TYPE(message)) /** * GST_MESSAGE_TIMESTAMP: * @message: a #GstMessage * * Get the timestamp of @message. This is the timestamp when the message * was created. */ #define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE(message)->timestamp) /** * GST_MESSAGE_SRC: * @message: a #GstMessage * * Get the object that posted @message. */ #define GST_MESSAGE_SRC(message) (GST_MESSAGE(message)->src) /** * GstMessage: * @mini_object: the parent structure * @type: the #GstMessageType of the message * @timestamp: the timestamp of the message * @src: the src of the message * @structure: the #GstStructure containing the message info. * * A #GstMessage. */ struct _GstMessage { GstMiniObject mini_object; /*< private > *//* 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]; }; GType gst_message_get_type (void); const gchar* gst_message_type_get_name (GstMessageType type); GQuark gst_message_type_to_quark (GstMessageType type); /* refcounting */ /** * gst_message_ref: * @msg: the message to ref * * Convenience macro to increase the reference count of the message. * * Returns: @msg (for convenience when doing assignments) */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstMessage * gst_message_ref (GstMessage * msg); #endif static inline GstMessage * gst_message_ref (GstMessage * msg) { /* not using a macro here because gcc-4.1 will complain * if the return value isn't used (because of the cast) */ return (GstMessage *) gst_mini_object_ref (GST_MINI_OBJECT (msg)); } /** * gst_message_unref: * @msg: the message to unref * * Convenience macro to decrease the reference count of the message, possibly * freeing it. */ #define gst_message_unref(msg) gst_mini_object_unref (GST_MINI_OBJECT (msg)) /* copy message */ /** * gst_message_copy: * @msg: the message to copy * * Creates a copy of the message. Returns a copy of the message. * * MT safe */ #define gst_message_copy(msg) GST_MESSAGE (gst_mini_object_copy (GST_MINI_OBJECT (msg))) /** * gst_message_make_writable: * @msg: the message to make writable * * Checks if a message is writable. If not, a writable copy is made and * returned. Returns a message (possibly a duplicate) that is writable. * * MT safe */ #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_info (GstObject * src, GError * error, gchar * debug); GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list); GstMessage * gst_message_new_buffering (GstObject * src, gint percent); GstMessage * gst_message_new_state_changed (GstObject * src, GstState oldstate, GstState newstate, GstState pending); GstMessage * gst_message_new_state_dirty (GstObject * src); GstMessage * gst_message_new_clock_provide (GstObject * src, GstClock *clock, gboolean ready); GstMessage * gst_message_new_clock_lost (GstObject * src, GstClock *clock); GstMessage * gst_message_new_new_clock (GstObject * src, GstClock *clock); GstMessage * gst_message_new_application (GstObject * src, GstStructure * structure); GstMessage * gst_message_new_element (GstObject * src, GstStructure * structure); GstMessage * gst_message_new_segment_start (GstObject * src, GstFormat format, gint64 position); GstMessage * gst_message_new_segment_done (GstObject * src, GstFormat format, gint64 position); GstMessage * gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration); GstMessage * gst_message_new_async_start (GstObject * src, gboolean new_base_time); GstMessage * gst_message_new_async_done (GstObject * src); GstMessage * gst_message_new_latency (GstObject * src); GstMessage * gst_message_new_custom (GstMessageType type, GstObject * src, GstStructure * structure); 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_info (GstMessage *message, GError **gerror, gchar **debug); void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list); void gst_message_parse_buffering (GstMessage *message, gint *percent); void gst_message_parse_state_changed (GstMessage *message, GstState *oldstate, GstState *newstate, GstState *pending); void gst_message_parse_clock_provide (GstMessage *message, GstClock **clock, gboolean *ready); void gst_message_parse_clock_lost (GstMessage *message, GstClock **clock); void gst_message_parse_new_clock (GstMessage *message, GstClock **clock); void gst_message_parse_segment_start (GstMessage *message, GstFormat *format, gint64 *position); void gst_message_parse_segment_done (GstMessage *message, GstFormat *format, gint64 *position); void gst_message_parse_duration (GstMessage *message, GstFormat *format, gint64 *duration); void gst_message_parse_async_start (GstMessage *message, gboolean *new_base_time); const GstStructure * gst_message_get_structure (GstMessage *message); G_END_DECLS #endif /* __GST_MESSAGE_H__ */