/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2005 Wim Taymans * 2011 Wim Taymans * * gstquery.h: GstQuery API declaration * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifndef __GST_QUERY_H__ #define __GST_QUERY_H__ #include #include #include G_BEGIN_DECLS typedef struct _GstQuery GstQuery; #include /** * GstQueryTypeFlags: * @GST_QUERY_TYPE_UPSTREAM: Set if the query can travel upstream. * @GST_QUERY_TYPE_DOWNSTREAM: Set if the query can travel downstream. * @GST_QUERY_TYPE_SERIALIZED: Set if the query should be serialized with data * flow. * * #GstQueryTypeFlags indicate the aspects of the different #GstQueryType * values. You can get the type flags of a #GstQueryType with the * gst_query_type_get_flags() function. */ typedef enum { GST_QUERY_TYPE_UPSTREAM = 1 << 0, GST_QUERY_TYPE_DOWNSTREAM = 1 << 1, GST_QUERY_TYPE_SERIALIZED = 1 << 2 } GstQueryTypeFlags; /** * GST_QUERY_TYPE_BOTH: (value 3) (type GstQueryTypeFlags) * * The same thing as #GST_QUERY_TYPE_UPSTREAM | #GST_QUERY_TYPE_DOWNSTREAM. */ #define GST_QUERY_TYPE_BOTH \ ((GstQueryTypeFlags)(GST_QUERY_TYPE_UPSTREAM | GST_QUERY_TYPE_DOWNSTREAM)) #define GST_QUERY_NUM_SHIFT (8) /** * GST_QUERY_MAKE_TYPE: * @num: the query number to create * @flags: the query flags * * when making custom query types, use this macro with the num and * the given flags */ #define GST_QUERY_MAKE_TYPE(num,flags) \ (((num) << GST_QUERY_NUM_SHIFT) | (flags)) #define FLAG(name) GST_QUERY_TYPE_##name /** * GstQueryType: * @GST_QUERY_UNKNOWN: unknown query type * @GST_QUERY_POSITION: current position in stream * @GST_QUERY_DURATION: total duration of the stream * @GST_QUERY_LATENCY: latency of stream * @GST_QUERY_JITTER: current jitter of stream * @GST_QUERY_RATE: current rate of the stream * @GST_QUERY_SEEKING: seeking capabilities * @GST_QUERY_SEGMENT: segment start/stop positions * @GST_QUERY_CONVERT: convert values between formats * @GST_QUERY_FORMATS: query supported formats for convert * @GST_QUERY_BUFFERING: query available media for efficient seeking. * @GST_QUERY_CUSTOM: a custom application or element defined query. * @GST_QUERY_URI: query the URI of the source or sink. * @GST_QUERY_ALLOCATION: the buffer allocation properties * @GST_QUERY_SCHEDULING: the scheduling properties * @GST_QUERY_ACCEPT_CAPS: the accept caps query * @GST_QUERY_CAPS: the caps query * @GST_QUERY_DRAIN: wait till all serialized data is consumed downstream * @GST_QUERY_CONTEXT: query the pipeline-local context from * downstream or upstream (since 1.2) * * Standard predefined Query types */ /* NOTE: don't forget to update the table in gstquery.c when changing * this enum */ typedef enum { GST_QUERY_UNKNOWN = GST_QUERY_MAKE_TYPE (0, 0), GST_QUERY_POSITION = GST_QUERY_MAKE_TYPE (10, FLAG(BOTH)), GST_QUERY_DURATION = GST_QUERY_MAKE_TYPE (20, FLAG(BOTH)), GST_QUERY_LATENCY = GST_QUERY_MAKE_TYPE (30, FLAG(BOTH)), GST_QUERY_JITTER = GST_QUERY_MAKE_TYPE (40, FLAG(BOTH)), GST_QUERY_RATE = GST_QUERY_MAKE_TYPE (50, FLAG(BOTH)), GST_QUERY_SEEKING = GST_QUERY_MAKE_TYPE (60, FLAG(BOTH)), GST_QUERY_SEGMENT = GST_QUERY_MAKE_TYPE (70, FLAG(BOTH)), GST_QUERY_CONVERT = GST_QUERY_MAKE_TYPE (80, FLAG(BOTH)), GST_QUERY_FORMATS = GST_QUERY_MAKE_TYPE (90, FLAG(BOTH)), GST_QUERY_BUFFERING = GST_QUERY_MAKE_TYPE (110, FLAG(BOTH)), GST_QUERY_CUSTOM = GST_QUERY_MAKE_TYPE (120, FLAG(BOTH)), GST_QUERY_URI = GST_QUERY_MAKE_TYPE (130, FLAG(BOTH)), GST_QUERY_ALLOCATION = GST_QUERY_MAKE_TYPE (140, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)), GST_QUERY_SCHEDULING = GST_QUERY_MAKE_TYPE (150, FLAG(UPSTREAM)), GST_QUERY_ACCEPT_CAPS = GST_QUERY_MAKE_TYPE (160, FLAG(BOTH)), GST_QUERY_CAPS = GST_QUERY_MAKE_TYPE (170, FLAG(BOTH)), GST_QUERY_DRAIN = GST_QUERY_MAKE_TYPE (180, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)), GST_QUERY_CONTEXT = GST_QUERY_MAKE_TYPE (190, FLAG(BOTH)) } GstQueryType; #undef FLAG GST_API GType _gst_query_type; #define GST_TYPE_QUERY (_gst_query_type) #define GST_IS_QUERY(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_QUERY)) #define GST_QUERY_CAST(obj) ((GstQuery*)(obj)) #define GST_QUERY(obj) (GST_QUERY_CAST(obj)) /** * GST_QUERY_TYPE: * @query: the query to query * * Get the #GstQueryType of the query. */ #define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type) /** * GST_QUERY_TYPE_NAME: * @query: the query to query * * Get a constant string representation of the #GstQueryType of the query. */ #define GST_QUERY_TYPE_NAME(query) (gst_query_type_get_name(GST_QUERY_TYPE(query))) /** * GST_QUERY_IS_UPSTREAM: * @ev: the query to query * * Check if an query can travel upstream. */ #define GST_QUERY_IS_UPSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_UPSTREAM) /** * GST_QUERY_IS_DOWNSTREAM: * @ev: the query to query * * Check if an query can travel downstream. */ #define GST_QUERY_IS_DOWNSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_DOWNSTREAM) /** * GST_QUERY_IS_SERIALIZED: * @ev: the query to query * * Check if an query is serialized with the data stream. */ #define GST_QUERY_IS_SERIALIZED(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_SERIALIZED) /** * GstQuery: * @mini_object: The parent #GstMiniObject type * @type: the #GstQueryType * * The #GstQuery structure. */ struct _GstQuery { GstMiniObject mini_object; /*< public > *//* with COW */ GstQueryType type; }; /** * GstBufferingMode: * @GST_BUFFERING_STREAM: a small amount of data is buffered * @GST_BUFFERING_DOWNLOAD: the stream is being downloaded * @GST_BUFFERING_TIMESHIFT: the stream is being downloaded in a ringbuffer * @GST_BUFFERING_LIVE: the stream is a live stream * * The different types of buffering methods. */ typedef enum { GST_BUFFERING_STREAM, GST_BUFFERING_DOWNLOAD, GST_BUFFERING_TIMESHIFT, GST_BUFFERING_LIVE } GstBufferingMode; #include #include #include #include #include #include #include GST_API const gchar* gst_query_type_get_name (GstQueryType type); GST_API GQuark gst_query_type_to_quark (GstQueryType type); GST_API GstQueryTypeFlags gst_query_type_get_flags (GstQueryType type); GST_API GType gst_query_get_type (void); /* refcounting */ /** * gst_query_ref: * @q: a #GstQuery to increase the refcount of. * * Increases the refcount of the given query by one. * * Returns: @q */ static inline GstQuery * gst_query_ref (GstQuery * q) { return GST_QUERY_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (q))); } /** * gst_query_unref: * @q: a #GstQuery to decrease the refcount of. * * Decreases the refcount of the query. If the refcount reaches 0, the query * will be freed. */ static inline void gst_query_unref (GstQuery * q) { gst_mini_object_unref (GST_MINI_OBJECT_CAST (q)); } /* copy query */ /** * gst_query_copy: * @q: a #GstQuery to copy. * * Copies the given query using the copy function of the parent #GstStructure. * * Free-function: gst_query_unref * * Returns: (transfer full): a new copy of @q. */ static inline GstQuery * gst_query_copy (const GstQuery * q) { return GST_QUERY_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (q))); } /** * gst_query_is_writable: * @q: a #GstQuery * * Tests if you can safely write data into a query's structure. */ #define gst_query_is_writable(q) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (q)) /** * gst_query_make_writable: * @q: (transfer full): a #GstQuery to make writable * * Makes a writable query from the given query. * * Returns: (transfer full): a new writable query (possibly same as @q) */ #define gst_query_make_writable(q) GST_QUERY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (q))) /** * gst_query_replace: * @old_query: (inout) (transfer full) (nullable): pointer to a pointer to a * #GstQuery to be replaced. * @new_query: (allow-none) (transfer none): pointer to a #GstQuery that will * replace the query pointed to by @old_query. * * Modifies a pointer to a #GstQuery to point to a different #GstQuery. The * modification is done atomically (so this is useful for ensuring thread safety * in some cases), and the reference counts are updated appropriately (the old * query is unreffed, the new one is reffed). * * Either @new_query or the #GstQuery pointed to by @old_query may be %NULL. * * Returns: %TRUE if @new_query was different from @old_query */ static inline gboolean gst_query_replace (GstQuery **old_query, GstQuery *new_query) { return gst_mini_object_replace ((GstMiniObject **) old_query, (GstMiniObject *) new_query); } /* application specific query */ GST_API GstQuery * gst_query_new_custom (GstQueryType type, GstStructure *structure) G_GNUC_MALLOC; GST_API const GstStructure * gst_query_get_structure (GstQuery *query); GST_API GstStructure * gst_query_writable_structure (GstQuery *query); /* position query */ GST_API GstQuery* gst_query_new_position (GstFormat format) G_GNUC_MALLOC; GST_API void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur); GST_API void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur); /* duration query */ GST_API GstQuery* gst_query_new_duration (GstFormat format) G_GNUC_MALLOC; GST_API void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration); GST_API void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration); /* latency query */ GST_API GstQuery* gst_query_new_latency (void) G_GNUC_MALLOC; GST_API void gst_query_set_latency (GstQuery *query, gboolean live, GstClockTime min_latency, GstClockTime max_latency); GST_API void gst_query_parse_latency (GstQuery *query, gboolean *live, GstClockTime *min_latency, GstClockTime *max_latency); /* convert query */ GST_API GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format) G_GNUC_MALLOC; GST_API void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value, GstFormat dest_format, gint64 dest_value); GST_API void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value, GstFormat *dest_format, gint64 *dest_value); /* segment query */ GST_API GstQuery* gst_query_new_segment (GstFormat format) G_GNUC_MALLOC; GST_API void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format, gint64 start_value, gint64 stop_value); GST_API void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format, gint64 *start_value, gint64 *stop_value); /* seeking query */ GST_API GstQuery* gst_query_new_seeking (GstFormat format) G_GNUC_MALLOC; GST_API void gst_query_set_seeking (GstQuery *query, GstFormat format, gboolean seekable, gint64 segment_start, gint64 segment_end); GST_API void gst_query_parse_seeking (GstQuery *query, GstFormat *format, gboolean *seekable, gint64 *segment_start, gint64 *segment_end); /* formats query */ GST_API GstQuery* gst_query_new_formats (void) G_GNUC_MALLOC; GST_API void gst_query_set_formats (GstQuery *query, gint n_formats, ...); GST_API void gst_query_set_formatsv (GstQuery *query, gint n_formats, const GstFormat *formats); GST_API void gst_query_parse_n_formats (GstQuery *query, guint *n_formats); GST_API void gst_query_parse_nth_format (GstQuery *query, guint nth, GstFormat *format); /* buffering query */ GST_API GstQuery* gst_query_new_buffering (GstFormat format) G_GNUC_MALLOC; GST_API void gst_query_set_buffering_percent (GstQuery *query, gboolean busy, gint percent); GST_API void gst_query_parse_buffering_percent (GstQuery *query, gboolean *busy, gint *percent); GST_API void gst_query_set_buffering_stats (GstQuery *query, GstBufferingMode mode, gint avg_in, gint avg_out, gint64 buffering_left); GST_API void gst_query_parse_buffering_stats (GstQuery *query, GstBufferingMode *mode, gint *avg_in, gint *avg_out, gint64 *buffering_left); GST_API void gst_query_set_buffering_range (GstQuery *query, GstFormat format, gint64 start, gint64 stop, gint64 estimated_total); GST_API void gst_query_parse_buffering_range (GstQuery *query, GstFormat *format, gint64 *start, gint64 *stop, gint64 *estimated_total); GST_API gboolean gst_query_add_buffering_range (GstQuery *query, gint64 start, gint64 stop); GST_API guint gst_query_get_n_buffering_ranges (GstQuery *query); GST_API gboolean gst_query_parse_nth_buffering_range (GstQuery *query, guint index, gint64 *start, gint64 *stop); /* URI query */ GST_API GstQuery * gst_query_new_uri (void) G_GNUC_MALLOC; GST_API void gst_query_parse_uri (GstQuery *query, gchar **uri); GST_API void gst_query_set_uri (GstQuery *query, const gchar *uri); GST_API void gst_query_parse_uri_redirection (GstQuery *query, gchar **uri); GST_API void gst_query_set_uri_redirection (GstQuery *query, const gchar *uri); GST_API void gst_query_parse_uri_redirection_permanent (GstQuery *query, gboolean * permanent); GST_API void gst_query_set_uri_redirection_permanent (GstQuery *query, gboolean permanent); /* allocation query */ GST_API GstQuery * gst_query_new_allocation (GstCaps *caps, gboolean need_pool) G_GNUC_MALLOC; GST_API void gst_query_parse_allocation (GstQuery *query, GstCaps **caps, gboolean *need_pool); /* pools */ GST_API void gst_query_add_allocation_pool (GstQuery *query, GstBufferPool *pool, guint size, guint min_buffers, guint max_buffers); GST_API guint gst_query_get_n_allocation_pools (GstQuery *query); GST_API void gst_query_parse_nth_allocation_pool (GstQuery *query, guint index, GstBufferPool **pool, guint *size, guint *min_buffers, guint *max_buffers); GST_API void gst_query_set_nth_allocation_pool (GstQuery *query, guint index, GstBufferPool *pool, guint size, guint min_buffers, guint max_buffers); GST_API void gst_query_remove_nth_allocation_pool (GstQuery *query, guint index); /* allocators */ GST_API void gst_query_add_allocation_param (GstQuery *query, GstAllocator *allocator, const GstAllocationParams *params); GST_API guint gst_query_get_n_allocation_params (GstQuery *query); GST_API void gst_query_parse_nth_allocation_param (GstQuery *query, guint index, GstAllocator **allocator, GstAllocationParams *params); GST_API void gst_query_set_nth_allocation_param (GstQuery *query, guint index, GstAllocator *allocator, const GstAllocationParams *params); GST_API void gst_query_remove_nth_allocation_param (GstQuery *query, guint index); /* metadata */ GST_API void gst_query_add_allocation_meta (GstQuery *query, GType api, const GstStructure *params); GST_API guint gst_query_get_n_allocation_metas (GstQuery *query); GST_API GType gst_query_parse_nth_allocation_meta (GstQuery *query, guint index, const GstStructure **params); GST_API void gst_query_remove_nth_allocation_meta (GstQuery *query, guint index); GST_API gboolean gst_query_find_allocation_meta (GstQuery *query, GType api, guint *index); /* scheduling query */ /** * GstSchedulingFlags: * @GST_SCHEDULING_FLAG_SEEKABLE: if seeking is possible * @GST_SCHEDULING_FLAG_SEQUENTIAL: if sequential access is recommended * @GST_SCHEDULING_FLAG_BANDWIDTH_LIMITED: if bandwidth is limited and buffering possible (since 1.2) * * The different scheduling flags. */ typedef enum { GST_SCHEDULING_FLAG_SEEKABLE = (1 << 0), GST_SCHEDULING_FLAG_SEQUENTIAL = (1 << 1), GST_SCHEDULING_FLAG_BANDWIDTH_LIMITED = (1 << 2) } GstSchedulingFlags; GST_API GstQuery * gst_query_new_scheduling (void) G_GNUC_MALLOC; GST_API void gst_query_set_scheduling (GstQuery *query, GstSchedulingFlags flags, gint minsize, gint maxsize, gint align); GST_API void gst_query_parse_scheduling (GstQuery *query, GstSchedulingFlags *flags, gint *minsize, gint *maxsize, gint *align); GST_API void gst_query_add_scheduling_mode (GstQuery *query, GstPadMode mode); GST_API guint gst_query_get_n_scheduling_modes (GstQuery *query); GST_API GstPadMode gst_query_parse_nth_scheduling_mode (GstQuery *query, guint index); GST_API gboolean gst_query_has_scheduling_mode (GstQuery *query, GstPadMode mode); GST_API gboolean gst_query_has_scheduling_mode_with_flags (GstQuery * query, GstPadMode mode, GstSchedulingFlags flags); /* accept-caps query */ GST_API GstQuery * gst_query_new_accept_caps (GstCaps *caps) G_GNUC_MALLOC; GST_API void gst_query_parse_accept_caps (GstQuery *query, GstCaps **caps); GST_API void gst_query_set_accept_caps_result (GstQuery *query, gboolean result); GST_API void gst_query_parse_accept_caps_result (GstQuery *query, gboolean *result); /* caps query */ GST_API GstQuery * gst_query_new_caps (GstCaps *filter) G_GNUC_MALLOC; GST_API void gst_query_parse_caps (GstQuery *query, GstCaps **filter); GST_API void gst_query_set_caps_result (GstQuery *query, GstCaps *caps); GST_API void gst_query_parse_caps_result (GstQuery *query, GstCaps **caps); /* drain query */ GST_API GstQuery * gst_query_new_drain (void) G_GNUC_MALLOC; /* context query */ GST_API GstQuery * gst_query_new_context (const gchar * context_type) G_GNUC_MALLOC; GST_API gboolean gst_query_parse_context_type (GstQuery * query, const gchar ** context_type); GST_API void gst_query_set_context (GstQuery *query, GstContext *context); GST_API void gst_query_parse_context (GstQuery *query, GstContext **context); #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstQuery, gst_query_unref) #endif G_END_DECLS #endif /* __GST_QUERY_H__ */