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gstreamer/gst/gstbuffer.h
Wim Taymans 8c864712e6 buffer: make _foreach_meta more powerful 
Make _foreach_meta return FALSE when the foreach function returned FALSE.
2012-07-17 12:57:59 +02:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* 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 <gst/gstminiobject.h>
#include <gst/gstclock.h>
#include <gst/gstallocator.h>
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 #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.
*/
#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. The buffer
* is also part of the headers of the STREAM_CONFIG event.
* @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_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_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,
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);
#define gst_buffer_prepend_memory(b,m) gst_buffer_insert_memory ((b), 0, (m))
#define gst_buffer_append_memory(b,m) gst_buffer_insert_memory ((b), -1, (m))
#define gst_buffer_replace_memory(b,i,m) gst_buffer_replace_memory_range ((b), (i), 1, (m))
#define gst_buffer_replace_all_memory(b,m) gst_buffer_replace_memory_range ((b), 0, -1, (m))
#define gst_buffer_get_memory(b,i) gst_buffer_get_memory_range ((b), (i), 1)
#define gst_buffer_get_all_memory(b) gst_buffer_get_memory_range ((b), 0, -1)
#define gst_buffer_remove_memory(b,i) gst_buffer_remove_memory_range ((b), (i), 1)
#define gst_buffer_remove_all_memory(b) gst_buffer_remove_memory_range ((b), 0, -1)
gboolean gst_buffer_find_memory (GstBuffer *buffer, gsize offset, gsize size,
guint *idx, guint *length, gsize *skip);
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);
void gst_buffer_resize_range (GstBuffer *buffer, guint idx, gint length,
gssize offset, gssize size);
#define gst_buffer_get_sizes(b,of,ms) gst_buffer_get_sizes_range ((b), 0, -1, (of), (ms))
#define gst_buffer_get_size(b) gst_buffer_get_sizes_range ((b), 0, -1, NULL, NULL)
#define gst_buffer_resize(b,of,s) gst_buffer_resize_range ((b), 0, -1, (of), (s))
#define gst_buffer_set_size(b,s) gst_buffer_resize_range ((b), 0, -1, 0, (s))
gboolean gst_buffer_map_range (GstBuffer *buffer, guint idx, gint length,
GstMapInfo *info, GstMapFlags flags);
#define gst_buffer_map(b,i,f) gst_buffer_map_range ((b), 0, -1, (i), (f))
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().
* 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 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
*
* 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);
/* append two buffers */
GstBuffer* gst_buffer_append_region (GstBuffer *buf1, GstBuffer *buf2,
gssize offset, gssize size);
#define gst_buffer_append(b1,b2) gst_buffer_append_region ((b1), (b2), 0, -1)
/* metadata */
#include <gst/gstmeta.h>
/**
* GstBufferForeachMetaFunc:
* @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, 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))
G_END_DECLS
#endif /* __GST_BUFFER_H__ */
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