/* 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, 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; /** * GST_BUFFER_TRACE_NAME: * * The name used for tracing memory allocations. */ #define GST_BUFFER_TRACE_NAME "GstBuffer" #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 #GstBufferFlag 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 #GstBufferFlag 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 #GstBufferFlag 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 #GstBufferFlag 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_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. * * Since: 0.10.9 */ #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 end 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_IN_CAPS: the buffer has been added as a field in a #GstCaps. * @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_IN_CAPS = (GST_MINI_OBJECT_FLAG_LAST << 10), 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); /* allocation */ GstBuffer * gst_buffer_new (void); GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size, gsize align); GstBuffer * gst_buffer_new_wrapped_full (gpointer data, GFreeFunc free_func, gsize offset, gsize size); GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size); /* memory blocks */ guint gst_buffer_n_memory (GstBuffer *buffer); void gst_buffer_take_memory (GstBuffer *buffer, gint idx, GstMemory *mem); GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx, GstMapFlags flags); void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, guint length); /** * gst_buffer_remove_memory: * @b: a #GstBuffer. * @i: an index * * Remove the memory block in @b at @i. */ #define gst_buffer_remove_memory(b,i) gst_buffer_remove_memory_range ((b), (i), 1) 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 (GstBuffer *buffer, gsize *offset, gsize *maxsize); void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size); /** * gst_buffer_get_size: * @b: a #GstBuffer. * * Get the size of @b. */ #define gst_buffer_get_size(b) gst_buffer_get_sizes ((b), NULL, NULL) /** * gst_buffer_set_size: * @b: a #GstBuffer. * @s: a new size * * Set the size of @b to @s. This will remove or trim the memory blocks * in the buffer. */ #define gst_buffer_set_size(b,s) gst_buffer_resize ((b), 0, (s)) gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags); void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info); /* refcounting */ /** * gst_buffer_ref: * @buf: a #GstBuffer. * * Increases the refcount of the given buffer by one. * * Note that the refcount affects the writeability * of @buf and its metadata, see gst_buffer_is_writable() and * gst_buffer_is_metadata_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 also make a newly allocated * copy of the data the source buffer contains. * * 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))); } /** * 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 copied * and appended to already existing memory * @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be * merged * @GST_BUFFER_COPY_META: flag indicating that buffer meta should be * copied * * 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) } 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 */ void 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 data into a buffer's data array or validly * modify the caps and timestamp metadata. Metadata in a GstBuffer is always * writable, but it is only safe to change it when there is only one owner * of the buffer - ie, the refcount is 1. */ #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 * * Makes a writable buffer from the given buffer. If the source buffer is * already writable, this will simply return the same buffer. A copy will * otherwise be made using gst_buffer_copy(). * * 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): 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); /* span, two buffers, intelligently */ gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2); GstBuffer* gst_buffer_span (GstBuffer *buf1, gsize offset, GstBuffer *buf2, gsize size) G_GNUC_MALLOC; /* metadata */ #include /** * GstBufferMetaFunc: * @buffer: a #GstBuffer * @meta: 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, const GstMetaInfo *info); 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); void 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)) G_END_DECLS #endif /* __GST_BUFFER_H__ */