/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * gstbuffer.h: Header for GstBuffer object * * 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_BUFFER_H__ #define __GST_BUFFER_H__ #include #include #include G_BEGIN_DECLS GST_EXPORT GType _gst_buffer_type; typedef struct _GstBuffer GstBuffer; typedef struct _GstBufferPool GstBufferPool; #define GST_TYPE_BUFFER (_gst_buffer_type) #define GST_IS_BUFFER(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER)) #define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj)) #define GST_BUFFER(obj) (GST_BUFFER_CAST(obj)) /** * GST_BUFFER_FLAGS: * @buf: a #GstBuffer. * * A flags word containing #GstBufferFlags flags set on this buffer. */ #define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf) /** * GST_BUFFER_FLAG_IS_SET: * @buf: a #GstBuffer. * @flag: the #GstBufferFlags flag to check. * * Gives the status of a specific flag on a buffer. */ #define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag) /** * GST_BUFFER_FLAG_SET: * @buf: a #GstBuffer. * @flag: the #GstBufferFlags flag to set. * * Sets a buffer flag on a buffer. */ #define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag) /** * GST_BUFFER_FLAG_UNSET: * @buf: a #GstBuffer. * @flag: the #GstBufferFlags flag to clear. * * Clears a buffer flag. */ #define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag) /** * GST_BUFFER_PTS: * @buf: a #GstBuffer.: * * The presentation timestamp (pts) in nanoseconds (as a #GstClockTime) * of the data in the buffer. This is the timestamp when the media should be * presented to the user. * Value will be %GST_CLOCK_TIME_NONE if the pts is unknown. */ #define GST_BUFFER_PTS(buf) (GST_BUFFER_CAST(buf)->pts) /** * GST_BUFFER_DTS: * @buf: a #GstBuffer.: * * The decoding timestamp (dts) in nanoseconds (as a #GstClockTime) * of the data in the buffer. This is the timestamp when the media should be * decoded or processed otherwise. * Value will be %GST_CLOCK_TIME_NONE if the dts is unknown. */ #define GST_BUFFER_DTS(buf) (GST_BUFFER_CAST(buf)->dts) /** * GST_BUFFER_DTS_OR_PTS: * @buf: a #GstBuffer.: * * Returns the buffer decoding timestamp (dts) if valid, else the buffer * presentation time (pts) */ #define GST_BUFFER_DTS_OR_PTS(buf) (GST_BUFFER_DTS_IS_VALID(buf) ? GST_BUFFER_DTS(buf) : GST_BUFFER_PTS (buf)) /** * GST_BUFFER_DURATION: * @buf: a #GstBuffer. * * The duration in nanoseconds (as a #GstClockTime) of the data in the buffer. * Value will be %GST_CLOCK_TIME_NONE if the duration is unknown. */ #define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration) /** * GST_BUFFER_OFFSET: * @buf: a #GstBuffer. * * The offset in the source file of the beginning of this buffer. */ #define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset) /** * GST_BUFFER_OFFSET_END: * @buf: a #GstBuffer. * * The offset in the source file of the end of this buffer. */ #define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end) /** * GST_BUFFER_OFFSET_NONE: * * Constant for no-offset return results. */ #define GST_BUFFER_OFFSET_NONE ((guint64)-1) /** * GST_BUFFER_DURATION_IS_VALID: * @buffer: a #GstBuffer * * Tests if the duration is known. */ #define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer))) /** * GST_BUFFER_PTS_IS_VALID: * @buffer: a #GstBuffer * * Tests if the pts is known. */ #define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer))) /** * GST_BUFFER_DTS_IS_VALID: * @buffer: a #GstBuffer * * Tests if the dts is known. */ #define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer))) /** * GST_BUFFER_OFFSET_IS_VALID: * @buffer: a #GstBuffer * * Tests if the start offset is known. */ #define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE) /** * GST_BUFFER_OFFSET_END_IS_VALID: * @buffer: a #GstBuffer * * Tests if the end offset is known. */ #define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE) /** * GST_BUFFER_IS_DISCONT: * @buffer: a #GstBuffer * * Tests if the buffer marks a discontinuity in the stream. */ #define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) /** * GstBufferFlags: * @GST_BUFFER_FLAG_LIVE: the buffer is live data and should be discarded in * the PAUSED state. * @GST_BUFFER_FLAG_DECODE_ONLY: the buffer contains data that should be dropped * because it will be clipped against the segment * boundaries or because it does not contain data * that should be shown to the user. * @GST_BUFFER_FLAG_DISCONT: the buffer marks a data discontinuity in the stream. * This typically occurs after a seek or a dropped buffer * from a live or network source. * @GST_BUFFER_FLAG_RESYNC: the buffer timestamps might have a discontinuity * and this buffer is a good point to resynchronize. * @GST_BUFFER_FLAG_CORRUPTED: the buffer data is corrupted. * @GST_BUFFER_FLAG_MARKER: the buffer contains a media specific marker. for * video this is typically the end of a frame boundary, for audio * this is usually the start of a talkspurt. * @GST_BUFFER_FLAG_HEADER: the buffer contains header information that is * needed to decode the following data. * @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the * stream and contains media neutral data (elements can * switch to optimized code path that ignores the buffer * content). * @GST_BUFFER_FLAG_DROPPABLE: the buffer can be dropped without breaking the * stream, for example to reduce bandwidth. * @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently. * @GST_BUFFER_FLAG_TAG_MEMORY: this flag is set when memory of the buffer * is added/removed * @GST_BUFFER_FLAG_SYNC_AFTER: Elements which write to disk or permanent * storage should ensure the data is synced after * writing the contents of this buffer. (Since 1.6) * @GST_BUFFER_FLAG_LAST: additional media specific flags can be added starting from * this flag. * * A set of buffer flags used to describe properties of a #GstBuffer. */ typedef enum { GST_BUFFER_FLAG_LIVE = (GST_MINI_OBJECT_FLAG_LAST << 0), GST_BUFFER_FLAG_DECODE_ONLY = (GST_MINI_OBJECT_FLAG_LAST << 1), GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2), GST_BUFFER_FLAG_RESYNC = (GST_MINI_OBJECT_FLAG_LAST << 3), GST_BUFFER_FLAG_CORRUPTED = (GST_MINI_OBJECT_FLAG_LAST << 4), GST_BUFFER_FLAG_MARKER = (GST_MINI_OBJECT_FLAG_LAST << 5), GST_BUFFER_FLAG_HEADER = (GST_MINI_OBJECT_FLAG_LAST << 6), GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 7), GST_BUFFER_FLAG_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 8), GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 9), GST_BUFFER_FLAG_TAG_MEMORY = (GST_MINI_OBJECT_FLAG_LAST << 10), GST_BUFFER_FLAG_SYNC_AFTER = (GST_MINI_OBJECT_FLAG_LAST << 11), GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16) } GstBufferFlags; /** * GstBuffer: * @mini_object: the parent structure * @pool: pointer to the pool owner of the buffer * @pts: presentation timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the * pts is not known or relevant. The pts contains the timestamp when the * media should be presented to the user. * @dts: decoding timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the * dts is not known or relevant. The dts contains the timestamp when the * media should be processed. * @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE * when the duration is not known or relevant. * @offset: a media specific offset for the buffer data. * For video frames, this is the frame number of this buffer. * For audio samples, this is the offset of the first sample in this buffer. * For file data or compressed data this is the byte offset of the first * byte in this buffer. * @offset_end: the last offset contained in this buffer. It has the same * format as @offset. * * The structure of a #GstBuffer. Use the associated macros to access the public * variables. */ struct _GstBuffer { GstMiniObject mini_object; /*< public >*/ /* with COW */ GstBufferPool *pool; /* timestamp */ GstClockTime pts; GstClockTime dts; GstClockTime duration; /* media specific offset */ guint64 offset; guint64 offset_end; }; GType gst_buffer_get_type (void); guint gst_buffer_get_max_memory (void); /* allocation */ GstBuffer * gst_buffer_new (void); GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size, GstAllocationParams * params); GstBuffer * gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data, gsize maxsize, gsize offset, gsize size, gpointer user_data, GDestroyNotify notify); GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size); /* memory blocks */ guint gst_buffer_n_memory (GstBuffer *buffer); void gst_buffer_insert_memory (GstBuffer *buffer, gint idx, GstMemory *mem); void gst_buffer_replace_memory_range (GstBuffer *buffer, guint idx, gint length, GstMemory *mem); GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx); GstMemory * gst_buffer_get_memory_range (GstBuffer *buffer, guint idx, gint length); void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, gint length); void gst_buffer_prepend_memory (GstBuffer *buffer, GstMemory *mem); void gst_buffer_append_memory (GstBuffer *buffer, GstMemory *mem); void gst_buffer_replace_memory (GstBuffer *buffer, guint idx, GstMemory *mem); void gst_buffer_replace_all_memory (GstBuffer *buffer, GstMemory *mem); GstMemory * gst_buffer_get_memory (GstBuffer *buffer, guint idx); GstMemory * gst_buffer_get_all_memory (GstBuffer *buffer); void gst_buffer_remove_memory (GstBuffer *buffer, guint idx); void gst_buffer_remove_all_memory (GstBuffer *buffer); gboolean gst_buffer_find_memory (GstBuffer *buffer, gsize offset, gsize size, guint *idx, guint *length, gsize *skip); gboolean gst_buffer_is_memory_range_writable (GstBuffer *buffer, guint idx, gint length); gboolean gst_buffer_is_all_memory_writable (GstBuffer *buffer); gsize gst_buffer_fill (GstBuffer *buffer, gsize offset, gconstpointer src, gsize size); gsize gst_buffer_extract (GstBuffer *buffer, gsize offset, gpointer dest, gsize size); gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset, gconstpointer mem, gsize size); gsize gst_buffer_memset (GstBuffer *buffer, gsize offset, guint8 val, gsize size); gsize gst_buffer_get_sizes_range (GstBuffer *buffer, guint idx, gint length, gsize *offset, gsize *maxsize); gboolean gst_buffer_resize_range (GstBuffer *buffer, guint idx, gint length, gssize offset, gssize size); gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize); gsize gst_buffer_get_size (GstBuffer *buffer); void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size); void gst_buffer_set_size (GstBuffer *buffer, gssize size); gboolean gst_buffer_map_range (GstBuffer *buffer, guint idx, gint length, GstMapInfo *info, GstMapFlags flags); gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags); void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info); void gst_buffer_extract_dup (GstBuffer *buffer, gsize offset, gsize size, gpointer *dest, gsize *dest_size); /* refcounting */ /** * gst_buffer_ref: * @buf: a #GstBuffer. * * Increases the refcount of the given buffer by one. * * Note that the refcount affects the writability * of @buf and its metadata, see gst_buffer_is_writable(). * It is important to note that keeping additional references to * GstBuffer instances can potentially increase the number * of memcpy operations in a pipeline. * * Returns: (transfer full): @buf */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstBuffer * gst_buffer_ref (GstBuffer * buf); #endif static inline GstBuffer * gst_buffer_ref (GstBuffer * buf) { return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf)); } /** * gst_buffer_unref: * @buf: (transfer full): a #GstBuffer. * * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer * with the associated metadata and memory will be freed. */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC void gst_buffer_unref (GstBuffer * buf); #endif static inline void gst_buffer_unref (GstBuffer * buf) { gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf)); } /* copy buffer */ /** * gst_buffer_copy: * @buf: a #GstBuffer. * * Create a copy of the given buffer. This will only copy the buffer's * data to a newly allocated memory if needed (if the type of memory * requires it), otherwise the underlying data is just referenced. * Check gst_buffer_copy_deep() if you want to force the data * to be copied to newly allocated memory. * * Returns: (transfer full): a new copy of @buf. */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstBuffer * gst_buffer_copy (const GstBuffer * buf); #endif static inline GstBuffer * gst_buffer_copy (const GstBuffer * buf) { return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf))); } GstBuffer * gst_buffer_copy_deep (const GstBuffer * buf); /** * GstBufferCopyFlags: * @GST_BUFFER_COPY_NONE: copy nothing * @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied * @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer pts, dts, * duration, offset and offset_end should be copied * @GST_BUFFER_COPY_MEMORY: flag indicating that buffer memory should be reffed * and appended to already existing memory. Unless the memory is marked as * NO_SHARE, no actual copy of the memory is made but it is simply reffed. * Add @GST_BUFFER_COPY_DEEP to force a real copy. * @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be * merged * @GST_BUFFER_COPY_META: flag indicating that buffer meta should be * copied * @GST_BUFFER_COPY_DEEP: flag indicating that memory should always be * copied instead of reffed (Since 1.2) * * A set of flags that can be provided to the gst_buffer_copy_into() * function to specify which items should be copied. */ typedef enum { GST_BUFFER_COPY_NONE = 0, GST_BUFFER_COPY_FLAGS = (1 << 0), GST_BUFFER_COPY_TIMESTAMPS = (1 << 1), GST_BUFFER_COPY_META = (1 << 2), GST_BUFFER_COPY_MEMORY = (1 << 3), GST_BUFFER_COPY_MERGE = (1 << 4), GST_BUFFER_COPY_DEEP = (1 << 5) } GstBufferCopyFlags; /** * GST_BUFFER_COPY_METADATA: * * Combination of all possible metadata fields that can be copied with * gst_buffer_copy_into(). */ #define GST_BUFFER_COPY_METADATA (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |\ GST_BUFFER_COPY_META) /** * GST_BUFFER_COPY_ALL: * * Combination of all possible fields that can be copied with * gst_buffer_copy_into(). */ #define GST_BUFFER_COPY_ALL ((GstBufferCopyFlags)(GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_MEMORY)) /* copies memory or metadata into newly allocated buffer */ gboolean gst_buffer_copy_into (GstBuffer *dest, GstBuffer *src, GstBufferCopyFlags flags, gsize offset, gsize size); /** * gst_buffer_is_writable: * @buf: a #GstBuffer * * Tests if you can safely write to a buffer's metadata or its memory array. * It is only safe to change buffer metadata when the current reference is * writable, i.e. nobody can see the modifications you will make. */ #define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf)) /** * gst_buffer_make_writable: * @buf: (transfer full): a #GstBuffer * * Returns a writable copy of @buf. If the source buffer is * already writable, this will simply return the same buffer. * * Use this function to ensure that a buffer can be safely modified before * making changes to it, including changing the metadata such as PTS/DTS. * * If the reference count of the source buffer @buf is exactly one, the caller * is the sole owner and this function will return the buffer object unchanged. * * If there is more than one reference on the object, a copy will be made using * gst_buffer_copy(). The passed-in @buf will be unreffed in that case, and the * caller will now own a reference to the new returned buffer object. Note * that this just copies the buffer structure itself, the underlying memory is * not copied if it can be shared amongst multiple buffers. * * In short, this function unrefs the buf in the argument and refs the buffer * that it returns. Don't access the argument after calling this function unless * you have an additional reference to it. * * Returns: (transfer full): a writable buffer which may or may not be the * same as @buf */ #define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf))) /** * gst_buffer_replace: * @obuf: (inout) (transfer full) (nullable): pointer to a pointer to * a #GstBuffer to be replaced. * @nbuf: (transfer none) (allow-none): pointer to a #GstBuffer that will * replace the buffer pointed to by @obuf. * * Modifies a pointer to a #GstBuffer to point to a different #GstBuffer. 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 * buffer is unreffed, the new is reffed). * * Either @nbuf or the #GstBuffer pointed to by @obuf may be %NULL. * * Returns: %TRUE when @obuf was different from @nbuf. */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC gboolean gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf); #endif static inline gboolean gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf) { return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf); } /* creating a region */ GstBuffer* gst_buffer_copy_region (GstBuffer *parent, GstBufferCopyFlags flags, gsize offset, gsize size); /* append two buffers */ GstBuffer* gst_buffer_append_region (GstBuffer *buf1, GstBuffer *buf2, gssize offset, gssize size); GstBuffer* gst_buffer_append (GstBuffer *buf1, GstBuffer *buf2); /* metadata */ #include /** * GstBufferForeachMetaFunc: * @buffer: a #GstBuffer * @meta: (out) (nullable): a pointer to a #GstMeta * @user_data: user data passed to gst_buffer_foreach_meta() * * A function that will be called from gst_buffer_foreach_meta(). The @meta * field will point to a the reference of the meta. * * @buffer should not be modified from this callback. * * When this function returns %TRUE, the next meta will be * returned. When %FALSE is returned, gst_buffer_foreach_meta() will return. * * When @meta is set to %NULL, the item will be removed from the buffer. * * Returns: %FALSE when gst_buffer_foreach_meta() should stop */ typedef gboolean (*GstBufferForeachMetaFunc) (GstBuffer *buffer, GstMeta **meta, gpointer user_data); GstMeta * gst_buffer_get_meta (GstBuffer *buffer, GType api); GstMeta * gst_buffer_add_meta (GstBuffer *buffer, const GstMetaInfo *info, gpointer params); gboolean gst_buffer_remove_meta (GstBuffer *buffer, GstMeta *meta); GstMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state); gboolean gst_buffer_foreach_meta (GstBuffer *buffer, GstBufferForeachMetaFunc func, gpointer user_data); /** * gst_value_set_buffer: * @v: a #GValue to receive the data * @b: (transfer none): a #GstBuffer to assign to the GstValue * * Sets @b as the value of @v. Caller retains reference to buffer. */ #define gst_value_set_buffer(v,b) g_value_set_boxed((v),(b)) /** * gst_value_take_buffer: * @v: a #GValue to receive the data * @b: (transfer full): a #GstBuffer to assign to the GstValue * * Sets @b as the value of @v. Caller gives away reference to buffer. */ #define gst_value_take_buffer(v,b) g_value_take_boxed(v,(b)) /** * gst_value_get_buffer: * @v: a #GValue to query * * Receives a #GstBuffer as the value of @v. Does not return a reference to * the buffer, so the pointer is only valid for as long as the caller owns * a reference to @v. * * Returns: (transfer none): buffer */ #define gst_value_get_buffer(v) GST_BUFFER_CAST (g_value_get_boxed(v)) typedef struct _GstParentBufferMeta GstParentBufferMeta; /** * GstParentBufferMeta: * @parent: the parent #GstMeta structure * @buffer: the #GstBuffer on which a reference is being held. * * The #GstParentBufferMeta is a #GstMeta which can be attached to a #GstBuffer * to hold a reference to another buffer that is only released when the child * #GstBuffer is released. * * Typically, #GstParentBufferMeta is used when the child buffer is directly * using the #GstMemory of the parent buffer, and wants to prevent the parent * buffer from being returned to a buffer pool until the #GstMemory is available * for re-use. * * Since: 1.6 */ struct _GstParentBufferMeta { GstMeta parent; /*< public >*/ GstBuffer *buffer; }; GType gst_parent_buffer_meta_api_get_type (void); #define GST_TYPE_PARENT_BUFFER_META_API_TYPE (gst_parent_buffer_meta_api_get_type()) /** * gst_buffer_get_parent_buffer_meta: * @b: a #GstBuffer * * Find and return a #GstParentBufferMeta if one exists on the * buffer */ #define gst_buffer_get_parent_buffer_meta(b) \ ((GstParentBufferMeta*)gst_buffer_get_meta((b),GST_PARENT_BUFFER_META_API_TYPE)) const GstMetaInfo *gst_parent_buffer_meta_get_info (void); #define GST_PARENT_BUFFER_META_INFO (gst_parent_buffer_meta_get_info()) /* implementation */ GstParentBufferMeta *gst_buffer_add_parent_buffer_meta (GstBuffer *buffer, GstBuffer *ref); G_END_DECLS #endif /* __GST_BUFFER_H__ */