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2740 lines
76 KiB
C
2740 lines
76 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstbuffer.c: Buffer operations
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstbuffer
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* @title: GstBuffer
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* @short_description: Data-passing buffer type
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* @see_also: #GstPad, #GstMiniObject, #GstMemory, #GstMeta, #GstBufferPool
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*
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* Buffers are the basic unit of data transfer in GStreamer. They contain the
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* timing and offset along with other arbitrary metadata that is associated
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* with the #GstMemory blocks that the buffer contains.
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*
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* Buffers are usually created with gst_buffer_new(). After a buffer has been
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* created one will typically allocate memory for it and add it to the buffer.
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* The following example creates a buffer that can hold a given video frame
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* with a given width, height and bits per plane.
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* |[<!-- language="C" -->
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* GstBuffer *buffer;
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* GstMemory *memory;
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* gint size, width, height, bpp;
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* ...
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* size = width * height * bpp;
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* buffer = gst_buffer_new ();
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* memory = gst_allocator_alloc (NULL, size, NULL);
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* gst_buffer_insert_memory (buffer, -1, memory);
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* ...
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* ]|
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*
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* Alternatively, use gst_buffer_new_allocate() to create a buffer with
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* preallocated data of a given size.
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*
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* Buffers can contain a list of #GstMemory objects. You can retrieve how many
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* memory objects with gst_buffer_n_memory() and you can get a pointer
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* to memory with gst_buffer_peek_memory()
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*
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* A buffer will usually have timestamps, and a duration, but neither of these
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* are guaranteed (they may be set to #GST_CLOCK_TIME_NONE). Whenever a
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* meaningful value can be given for these, they should be set. The timestamps
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* and duration are measured in nanoseconds (they are #GstClockTime values).
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*
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* The buffer DTS refers to the timestamp when the buffer should be decoded and
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* is usually monotonically increasing. The buffer PTS refers to the timestamp when
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* the buffer content should be presented to the user and is not always
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* monotonically increasing.
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*
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* A buffer can also have one or both of a start and an end offset. These are
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* media-type specific. For video buffers, the start offset will generally be
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* the frame number. For audio buffers, it will be the number of samples
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* produced so far. For compressed data, it could be the byte offset in a
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* source or destination file. Likewise, the end offset will be the offset of
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* the end of the buffer. These can only be meaningfully interpreted if you
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* know the media type of the buffer (the preceding CAPS event). Either or both
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* can be set to #GST_BUFFER_OFFSET_NONE.
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*
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* gst_buffer_ref() is used to increase the refcount of a buffer. This must be
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* done when you want to keep a handle to the buffer after pushing it to the
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* next element. The buffer refcount determines the writability of the buffer, a
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* buffer is only writable when the refcount is exactly 1, i.e. when the caller
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* has the only reference to the buffer.
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*
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* To efficiently create a smaller buffer out of an existing one, you can
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* use gst_buffer_copy_region(). This method tries to share the memory objects
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* between the two buffers.
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*
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* If a plug-in wants to modify the buffer data or metadata in-place, it should
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* first obtain a buffer that is safe to modify by using
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* gst_buffer_make_writable(). This function is optimized so that a copy will
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* only be made when it is necessary.
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*
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* Several flags of the buffer can be set and unset with the
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* GST_BUFFER_FLAG_SET() and GST_BUFFER_FLAG_UNSET() macros. Use
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* GST_BUFFER_FLAG_IS_SET() to test if a certain #GstBufferFlags flag is set.
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*
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* Buffers can be efficiently merged into a larger buffer with
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* gst_buffer_append(). Copying of memory will only be done when absolutely
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* needed.
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*
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* Arbitrary extra metadata can be set on a buffer with gst_buffer_add_meta().
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* Metadata can be retrieved with gst_buffer_get_meta(). See also #GstMeta
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*
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* An element should either unref the buffer or push it out on a src pad
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* using gst_pad_push() (see #GstPad).
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*
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* Buffers are usually freed by unreffing them with gst_buffer_unref(). When
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* the refcount drops to 0, any memory and metadata pointed to by the buffer is
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* unreffed as well. Buffers allocated from a #GstBufferPool will be returned to
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* the pool when the refcount drops to 0.
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*
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* The #GstParentBufferMeta is a meta which can be attached to a #GstBuffer
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* to hold a reference to another buffer that is only released when the child
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* #GstBuffer is released.
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*
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* Typically, #GstParentBufferMeta is used when the child buffer is directly
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* using the #GstMemory of the parent buffer, and wants to prevent the parent
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* buffer from being returned to a buffer pool until the #GstMemory is available
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* for re-use. (Since 1.6)
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*
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*/
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#include "gst_private.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include "gstbuffer.h"
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#include "gstbufferpool.h"
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#include "gstinfo.h"
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#include "gstutils.h"
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#include "gstversion.h"
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GType _gst_buffer_type = 0;
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typedef struct _GstMetaItem GstMetaItem;
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struct _GstMetaItem
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{
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GstMetaItem *next;
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GstMeta meta;
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};
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#define ITEM_SIZE(info) ((info)->size + sizeof (GstMetaItem))
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#define GST_BUFFER_MEM_MAX 16
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#define GST_BUFFER_SLICE_SIZE(b) (((GstBufferImpl *)(b))->slice_size)
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#define GST_BUFFER_MEM_LEN(b) (((GstBufferImpl *)(b))->len)
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#define GST_BUFFER_MEM_ARRAY(b) (((GstBufferImpl *)(b))->mem)
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#define GST_BUFFER_MEM_PTR(b,i) (((GstBufferImpl *)(b))->mem[i])
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#define GST_BUFFER_BUFMEM(b) (((GstBufferImpl *)(b))->bufmem)
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#define GST_BUFFER_META(b) (((GstBufferImpl *)(b))->item)
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typedef struct
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{
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GstBuffer buffer;
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gsize slice_size;
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/* the memory blocks */
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guint len;
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GstMemory *mem[GST_BUFFER_MEM_MAX];
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/* memory of the buffer when allocated from 1 chunk */
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GstMemory *bufmem;
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/* FIXME, make metadata allocation more efficient by using part of the
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* GstBufferImpl */
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GstMetaItem *item;
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} GstBufferImpl;
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static gboolean
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_is_span (GstMemory ** mem, gsize len, gsize * poffset, GstMemory ** parent)
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{
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GstMemory *mcur, *mprv;
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gboolean have_offset = FALSE;
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gsize i;
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mcur = mprv = NULL;
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for (i = 0; i < len; i++) {
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if (mcur)
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mprv = mcur;
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mcur = mem[i];
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if (mprv && mcur) {
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gsize poffs;
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/* check if memory is contiguous */
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if (!gst_memory_is_span (mprv, mcur, &poffs))
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return FALSE;
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if (!have_offset) {
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if (poffset)
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*poffset = poffs;
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if (parent)
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*parent = mprv->parent;
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have_offset = TRUE;
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}
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}
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}
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return have_offset;
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}
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static GstMemory *
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_get_merged_memory (GstBuffer * buffer, guint idx, guint length)
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{
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GstMemory **mem, *result = NULL;
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GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %u", buffer, idx,
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length);
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mem = GST_BUFFER_MEM_ARRAY (buffer);
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if (G_UNLIKELY (length == 0)) {
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result = NULL;
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} else if (G_LIKELY (length == 1)) {
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result = gst_memory_ref (mem[idx]);
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} else {
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GstMemory *parent = NULL;
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gsize size, poffset = 0;
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size = gst_buffer_get_sizes_range (buffer, idx, length, NULL, NULL);
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if (G_UNLIKELY (_is_span (mem + idx, length, &poffset, &parent))) {
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if (!GST_MEMORY_IS_NO_SHARE (parent))
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result = gst_memory_share (parent, poffset, size);
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if (!result) {
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy for merge %p", parent);
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result = gst_memory_copy (parent, poffset, size);
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}
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} else {
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gsize i, tocopy, left;
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GstMapInfo sinfo, dinfo;
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guint8 *ptr;
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result = gst_allocator_alloc (NULL, size, NULL);
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if (result == NULL || !gst_memory_map (result, &dinfo, GST_MAP_WRITE)) {
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GST_CAT_ERROR (GST_CAT_BUFFER, "Failed to map memory writable");
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if (result)
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gst_memory_unref (result);
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return NULL;
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}
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ptr = dinfo.data;
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left = size;
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for (i = idx; i < (idx + length) && left > 0; i++) {
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if (!gst_memory_map (mem[i], &sinfo, GST_MAP_READ)) {
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GST_CAT_ERROR (GST_CAT_BUFFER,
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"buffer %p, idx %u, length %u failed to map readable", buffer,
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idx, length);
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gst_memory_unmap (result, &dinfo);
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gst_memory_unref (result);
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return NULL;
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}
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tocopy = MIN (sinfo.size, left);
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
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"memcpy %" G_GSIZE_FORMAT " bytes for merge %p from memory %p",
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tocopy, result, mem[i]);
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memcpy (ptr, (guint8 *) sinfo.data, tocopy);
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left -= tocopy;
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ptr += tocopy;
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gst_memory_unmap (mem[i], &sinfo);
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}
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gst_memory_unmap (result, &dinfo);
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}
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}
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return result;
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}
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static void
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_replace_memory (GstBuffer * buffer, guint len, guint idx, guint length,
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GstMemory * mem)
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{
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gsize end, i;
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end = idx + length;
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GST_CAT_LOG (GST_CAT_BUFFER,
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"buffer %p replace %u-%" G_GSIZE_FORMAT " with memory %p", buffer, idx,
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end, mem);
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/* unref old memory */
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for (i = idx; i < end; i++) {
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GstMemory *old = GST_BUFFER_MEM_PTR (buffer, i);
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gst_memory_unlock (old, GST_LOCK_FLAG_EXCLUSIVE);
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gst_memory_unref (old);
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}
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if (mem != NULL) {
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/* replace with single memory */
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gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
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GST_BUFFER_MEM_PTR (buffer, idx) = mem;
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idx++;
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length--;
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}
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if (end < len) {
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memmove (&GST_BUFFER_MEM_PTR (buffer, idx),
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&GST_BUFFER_MEM_PTR (buffer, end), (len - end) * sizeof (gpointer));
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}
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GST_BUFFER_MEM_LEN (buffer) = len - length;
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GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
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}
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/**
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* gst_buffer_get_flags:
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* @buffer: a #GstBuffer
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*
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* Get the #GstBufferFlags flags set on this buffer.
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*
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* Returns: the flags set on this buffer.
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*
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* Since: 1.10
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*/
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GstBufferFlags
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gst_buffer_get_flags (GstBuffer * buffer)
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{
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return (GstBufferFlags) GST_BUFFER_FLAGS (buffer);
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}
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/**
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* gst_buffer_flag_is_set:
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* @buffer: a #GstBuffer
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* @flags: the #GstBufferFlags flag to check.
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*
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* Gives the status of a specific flag on a buffer.
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*
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* Returns: %TRUE if all flags in @flags are found on @buffer.
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*
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* Since: 1.10
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*/
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gboolean
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gst_buffer_has_flags (GstBuffer * buffer, GstBufferFlags flags)
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{
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return GST_BUFFER_FLAG_IS_SET (buffer, flags);
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}
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/**
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* gst_buffer_set_flags:
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* @buffer: a #GstBuffer
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* @flags: the #GstBufferFlags to set.
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*
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* Sets one or more buffer flags on a buffer.
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*
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* Returns: %TRUE if @flags were successfully set on buffer.
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*
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* Since: 1.10
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*/
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gboolean
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gst_buffer_set_flags (GstBuffer * buffer, GstBufferFlags flags)
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{
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GST_BUFFER_FLAG_SET (buffer, flags);
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return TRUE;
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}
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/**
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* gst_buffer_unset_flags:
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* @buffer: a #GstBuffer
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* @flags: the #GstBufferFlags to clear
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*
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* Clears one or more buffer flags.
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*
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* Returns: true if @flags is successfully cleared from buffer.
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*
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* Since: 1.10
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*/
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gboolean
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gst_buffer_unset_flags (GstBuffer * buffer, GstBufferFlags flags)
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{
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GST_BUFFER_FLAG_UNSET (buffer, flags);
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return TRUE;
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}
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/* transfer full for return and transfer none for @mem */
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static inline GstMemory *
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_memory_get_exclusive_reference (GstMemory * mem)
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{
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GstMemory *ret = NULL;
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if (gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE)) {
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ret = gst_memory_ref (mem);
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} else {
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/* we cannot take another exclusive lock as the memory is already
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* locked WRITE + EXCLUSIVE according to part-miniobject.txt */
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ret = gst_memory_copy (mem, 0, -1);
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if (ret) {
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if (!gst_memory_lock (ret, GST_LOCK_FLAG_EXCLUSIVE)) {
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gst_memory_unref (ret);
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ret = NULL;
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}
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}
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}
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if (!ret)
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GST_CAT_WARNING (GST_CAT_BUFFER, "Failed to acquire an exclusive lock for "
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"memory %p", mem);
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return ret;
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}
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static inline void
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_memory_add (GstBuffer * buffer, gint idx, GstMemory * mem)
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{
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guint i, len = GST_BUFFER_MEM_LEN (buffer);
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GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %d, mem %p", buffer, idx, mem);
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if (G_UNLIKELY (len >= GST_BUFFER_MEM_MAX)) {
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/* too many buffer, span them. */
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/* FIXME, there is room for improvement here: We could only try to merge
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* 2 buffers to make some room. If we can't efficiently merge 2 buffers we
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* could try to only merge the two smallest buffers to avoid memcpy, etc. */
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "memory array overflow in buffer %p",
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buffer);
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_replace_memory (buffer, len, 0, len, _get_merged_memory (buffer, 0, len));
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/* we now have 1 single spanned buffer */
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len = 1;
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}
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if (idx == -1)
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idx = len;
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for (i = len; i > idx; i--) {
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/* move buffers to insert, FIXME, we need to insert first and then merge */
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GST_BUFFER_MEM_PTR (buffer, i) = GST_BUFFER_MEM_PTR (buffer, i - 1);
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}
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/* and insert the new buffer */
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GST_BUFFER_MEM_PTR (buffer, idx) = mem;
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GST_BUFFER_MEM_LEN (buffer) = len + 1;
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GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
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}
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GST_DEFINE_MINI_OBJECT_TYPE (GstBuffer, gst_buffer);
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void
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_priv_gst_buffer_initialize (void)
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{
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_gst_buffer_type = gst_buffer_get_type ();
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}
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/**
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* gst_buffer_get_max_memory:
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*
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* Get the maximum amount of memory blocks that a buffer can hold. This is a
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* compile time constant that can be queried with the function.
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*
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* When more memory blocks are added, existing memory blocks will be merged
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* together to make room for the new block.
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*
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* Returns: the maximum amount of memory blocks that a buffer can hold.
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*
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* Since: 1.2
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*/
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guint
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gst_buffer_get_max_memory (void)
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{
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return GST_BUFFER_MEM_MAX;
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}
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/**
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* gst_buffer_copy_into:
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* @dest: a destination #GstBuffer
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* @src: a source #GstBuffer
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* @flags: flags indicating what metadata fields should be copied.
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* @offset: offset to copy from
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* @size: total size to copy. If -1, all data is copied.
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*
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* Copies the information from @src into @dest.
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*
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* If @dest already contains memory and @flags contains GST_BUFFER_COPY_MEMORY,
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* the memory from @src will be appended to @dest.
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*
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* @flags indicate which fields will be copied.
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*
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* Returns: %TRUE if the copying succeeded, %FALSE otherwise.
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*/
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gboolean
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gst_buffer_copy_into (GstBuffer * dest, GstBuffer * src,
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GstBufferCopyFlags flags, gsize offset, gsize size)
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{
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GstMetaItem *walk;
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gsize bufsize;
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gboolean region = FALSE;
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g_return_val_if_fail (dest != NULL, FALSE);
|
|
g_return_val_if_fail (src != NULL, FALSE);
|
|
|
|
/* nothing to copy if the buffers are the same */
|
|
if (G_UNLIKELY (dest == src))
|
|
return TRUE;
|
|
|
|
g_return_val_if_fail (gst_buffer_is_writable (dest), FALSE);
|
|
|
|
bufsize = gst_buffer_get_size (src);
|
|
g_return_val_if_fail (bufsize >= offset, FALSE);
|
|
if (offset > 0)
|
|
region = TRUE;
|
|
if (size == -1)
|
|
size = bufsize - offset;
|
|
if (size < bufsize)
|
|
region = TRUE;
|
|
g_return_val_if_fail (bufsize >= offset + size, FALSE);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "copy %p to %p, offset %" G_GSIZE_FORMAT
|
|
"-%" G_GSIZE_FORMAT "/%" G_GSIZE_FORMAT, src, dest, offset, size,
|
|
bufsize);
|
|
|
|
if (flags & GST_BUFFER_COPY_FLAGS) {
|
|
/* copy flags */
|
|
guint flags_mask = ~GST_BUFFER_FLAG_TAG_MEMORY;
|
|
|
|
GST_MINI_OBJECT_FLAGS (dest) =
|
|
(GST_MINI_OBJECT_FLAGS (src) & flags_mask) |
|
|
(GST_MINI_OBJECT_FLAGS (dest) & ~flags_mask);
|
|
}
|
|
|
|
if (flags & GST_BUFFER_COPY_TIMESTAMPS) {
|
|
if (offset == 0) {
|
|
GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
|
|
GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
|
|
GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
|
|
if (size == bufsize) {
|
|
GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
|
|
GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
|
|
}
|
|
} else {
|
|
GST_BUFFER_PTS (dest) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_DTS (dest) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_DURATION (dest) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET_NONE;
|
|
GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_NONE;
|
|
}
|
|
}
|
|
|
|
if (flags & GST_BUFFER_COPY_MEMORY) {
|
|
gsize skip, left, len, dest_len, i, bsize;
|
|
gboolean deep;
|
|
|
|
deep = flags & GST_BUFFER_COPY_DEEP;
|
|
|
|
len = GST_BUFFER_MEM_LEN (src);
|
|
dest_len = GST_BUFFER_MEM_LEN (dest);
|
|
left = size;
|
|
skip = offset;
|
|
|
|
/* copy and make regions of the memory */
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
GstMemory *mem = GST_BUFFER_MEM_PTR (src, i);
|
|
|
|
bsize = gst_memory_get_sizes (mem, NULL, NULL);
|
|
|
|
if (bsize <= skip) {
|
|
/* don't copy buffer */
|
|
skip -= bsize;
|
|
} else {
|
|
GstMemory *newmem = NULL;
|
|
gsize tocopy;
|
|
|
|
tocopy = MIN (bsize - skip, left);
|
|
|
|
if (tocopy < bsize && !deep && !GST_MEMORY_IS_NO_SHARE (mem)) {
|
|
/* we need to clip something */
|
|
newmem = gst_memory_share (mem, skip, tocopy);
|
|
if (newmem) {
|
|
gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
skip = 0;
|
|
}
|
|
}
|
|
|
|
if (deep || GST_MEMORY_IS_NO_SHARE (mem) || (!newmem && tocopy < bsize)) {
|
|
/* deep copy or we're not allowed to share this memory
|
|
* between buffers, always copy then */
|
|
newmem = gst_memory_copy (mem, skip, tocopy);
|
|
if (newmem) {
|
|
gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
skip = 0;
|
|
}
|
|
} else if (!newmem) {
|
|
newmem = _memory_get_exclusive_reference (mem);
|
|
}
|
|
|
|
if (!newmem) {
|
|
gst_buffer_remove_memory_range (dest, dest_len, -1);
|
|
return FALSE;
|
|
}
|
|
|
|
_memory_add (dest, -1, newmem);
|
|
left -= tocopy;
|
|
}
|
|
}
|
|
if (flags & GST_BUFFER_COPY_MERGE) {
|
|
GstMemory *mem;
|
|
|
|
len = GST_BUFFER_MEM_LEN (dest);
|
|
mem = _get_merged_memory (dest, 0, len);
|
|
if (!mem) {
|
|
gst_buffer_remove_memory_range (dest, dest_len, -1);
|
|
return FALSE;
|
|
}
|
|
_replace_memory (dest, len, 0, len, mem);
|
|
}
|
|
}
|
|
|
|
if (flags & GST_BUFFER_COPY_META) {
|
|
/* NOTE: GstGLSyncMeta copying relies on the meta
|
|
* being copied now, after the buffer data,
|
|
* so this has to happen last */
|
|
for (walk = GST_BUFFER_META (src); walk; walk = walk->next) {
|
|
GstMeta *meta = &walk->meta;
|
|
const GstMetaInfo *info = meta->info;
|
|
|
|
/* Don't copy memory metas if we only copied part of the buffer, didn't
|
|
* copy memories or merged memories. In all these cases the memory
|
|
* structure has changed and the memory meta becomes meaningless.
|
|
*/
|
|
if ((region || !(flags & GST_BUFFER_COPY_MEMORY)
|
|
|| (flags & GST_BUFFER_COPY_MERGE))
|
|
&& gst_meta_api_type_has_tag (info->api, _gst_meta_tag_memory)) {
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER,
|
|
"don't copy memory meta %p of API type %s", meta,
|
|
g_type_name (info->api));
|
|
} else if (info->transform_func) {
|
|
GstMetaTransformCopy copy_data;
|
|
|
|
copy_data.region = region;
|
|
copy_data.offset = offset;
|
|
copy_data.size = size;
|
|
|
|
if (!info->transform_func (dest, meta, src,
|
|
_gst_meta_transform_copy, ©_data)) {
|
|
GST_CAT_ERROR (GST_CAT_BUFFER,
|
|
"failed to copy meta %p of API type %s", meta,
|
|
g_type_name (info->api));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_buffer_copy_with_flags (const GstBuffer * buffer, GstBufferCopyFlags flags)
|
|
{
|
|
GstBuffer *copy;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
|
|
/* create a fresh new buffer */
|
|
copy = gst_buffer_new ();
|
|
|
|
/* copy what the 'flags' want from our parent */
|
|
/* FIXME why we can't pass const to gst_buffer_copy_into() ? */
|
|
if (!gst_buffer_copy_into (copy, (GstBuffer *) buffer, flags, 0, -1))
|
|
gst_buffer_replace (©, NULL);
|
|
|
|
if (copy)
|
|
GST_BUFFER_FLAG_UNSET (copy, GST_BUFFER_FLAG_TAG_MEMORY);
|
|
|
|
return copy;
|
|
}
|
|
|
|
static GstBuffer *
|
|
_gst_buffer_copy (const GstBuffer * buffer)
|
|
{
|
|
return gst_buffer_copy_with_flags (buffer, GST_BUFFER_COPY_ALL);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_copy_deep:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* Create a copy of the given buffer. This will make a newly allocated
|
|
* copy of the data the source buffer contains.
|
|
*
|
|
* Returns: (transfer full): a new copy of @buf.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_copy_deep (const GstBuffer * buffer)
|
|
{
|
|
return gst_buffer_copy_with_flags (buffer,
|
|
GST_BUFFER_COPY_ALL | GST_BUFFER_COPY_DEEP);
|
|
}
|
|
|
|
/* the default dispose function revives the buffer and returns it to the
|
|
* pool when there is a pool */
|
|
static gboolean
|
|
_gst_buffer_dispose (GstBuffer * buffer)
|
|
{
|
|
GstBufferPool *pool;
|
|
|
|
/* no pool, do free */
|
|
if ((pool = buffer->pool) == NULL)
|
|
return TRUE;
|
|
|
|
/* keep the buffer alive */
|
|
gst_buffer_ref (buffer);
|
|
/* return the buffer to the pool */
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "release %p to pool %p", buffer, pool);
|
|
gst_buffer_pool_release_buffer (pool, buffer);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static void
|
|
_gst_buffer_free (GstBuffer * buffer)
|
|
{
|
|
GstMetaItem *walk, *next;
|
|
guint i, len;
|
|
gsize msize;
|
|
|
|
g_return_if_fail (buffer != NULL);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "finalize %p", buffer);
|
|
|
|
/* free metadata */
|
|
for (walk = GST_BUFFER_META (buffer); walk; walk = next) {
|
|
GstMeta *meta = &walk->meta;
|
|
const GstMetaInfo *info = meta->info;
|
|
|
|
/* call free_func if any */
|
|
if (info->free_func)
|
|
info->free_func (meta, buffer);
|
|
|
|
next = walk->next;
|
|
/* and free the slice */
|
|
g_slice_free1 (ITEM_SIZE (info), walk);
|
|
}
|
|
|
|
/* get the size, when unreffing the memory, we could also unref the buffer
|
|
* itself */
|
|
msize = GST_BUFFER_SLICE_SIZE (buffer);
|
|
|
|
/* free our memory */
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
for (i = 0; i < len; i++) {
|
|
gst_memory_unlock (GST_BUFFER_MEM_PTR (buffer, i), GST_LOCK_FLAG_EXCLUSIVE);
|
|
gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
|
|
}
|
|
|
|
/* we set msize to 0 when the buffer is part of the memory block */
|
|
if (msize) {
|
|
#ifdef USE_POISONING
|
|
memset (buffer, 0xff, msize);
|
|
#endif
|
|
g_slice_free1 (msize, buffer);
|
|
} else {
|
|
gst_memory_unref (GST_BUFFER_BUFMEM (buffer));
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_buffer_init (GstBufferImpl * buffer, gsize size)
|
|
{
|
|
gst_mini_object_init (GST_MINI_OBJECT_CAST (buffer), 0, _gst_buffer_type,
|
|
(GstMiniObjectCopyFunction) _gst_buffer_copy,
|
|
(GstMiniObjectDisposeFunction) _gst_buffer_dispose,
|
|
(GstMiniObjectFreeFunction) _gst_buffer_free);
|
|
|
|
GST_BUFFER_SLICE_SIZE (buffer) = size;
|
|
|
|
GST_BUFFER (buffer)->pool = NULL;
|
|
GST_BUFFER_PTS (buffer) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
|
|
GST_BUFFER_OFFSET (buffer) = GST_BUFFER_OFFSET_NONE;
|
|
GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET_NONE;
|
|
|
|
GST_BUFFER_MEM_LEN (buffer) = 0;
|
|
GST_BUFFER_META (buffer) = NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_new:
|
|
*
|
|
* Creates a newly allocated buffer without any data.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: (transfer full): the new #GstBuffer.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_new (void)
|
|
{
|
|
GstBufferImpl *newbuf;
|
|
|
|
newbuf = g_slice_new (GstBufferImpl);
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "new %p", newbuf);
|
|
|
|
gst_buffer_init (newbuf, sizeof (GstBufferImpl));
|
|
|
|
return GST_BUFFER_CAST (newbuf);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_new_allocate:
|
|
* @allocator: (transfer none) (allow-none): the #GstAllocator to use, or %NULL to use the
|
|
* default allocator
|
|
* @size: the size in bytes of the new buffer's data.
|
|
* @params: (transfer none) (allow-none): optional parameters
|
|
*
|
|
* Tries to create a newly allocated buffer with data of the given size and
|
|
* extra parameters from @allocator. If the requested amount of memory can't be
|
|
* allocated, %NULL will be returned. The allocated buffer memory is not cleared.
|
|
*
|
|
* When @allocator is %NULL, the default memory allocator will be used.
|
|
*
|
|
* Note that when @size == 0, the buffer will not have memory associated with it.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: (transfer full) (nullable): a new #GstBuffer, or %NULL if
|
|
* the memory couldn't be allocated.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
|
|
GstAllocationParams * params)
|
|
{
|
|
GstBuffer *newbuf;
|
|
GstMemory *mem;
|
|
#if 0
|
|
guint8 *data;
|
|
gsize asize;
|
|
#endif
|
|
|
|
#if 1
|
|
if (size > 0) {
|
|
mem = gst_allocator_alloc (allocator, size, params);
|
|
if (G_UNLIKELY (mem == NULL))
|
|
goto no_memory;
|
|
} else {
|
|
mem = NULL;
|
|
}
|
|
|
|
newbuf = gst_buffer_new ();
|
|
|
|
if (mem != NULL) {
|
|
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
_memory_add (newbuf, -1, mem);
|
|
}
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER,
|
|
"new buffer %p of size %" G_GSIZE_FORMAT " from allocator %p", newbuf,
|
|
size, allocator);
|
|
#endif
|
|
|
|
#if 0
|
|
asize = sizeof (GstBufferImpl) + size;
|
|
data = g_slice_alloc (asize);
|
|
if (G_UNLIKELY (data == NULL))
|
|
goto no_memory;
|
|
|
|
newbuf = GST_BUFFER_CAST (data);
|
|
|
|
gst_buffer_init ((GstBufferImpl *) data, asize);
|
|
if (size > 0) {
|
|
mem = gst_memory_new_wrapped (0, data + sizeof (GstBufferImpl), NULL,
|
|
size, 0, size);
|
|
_memory_add (newbuf, -1, mem, TRUE);
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
/* allocate memory and buffer, it might be interesting to do this but there
|
|
* are many complications. We need to keep the memory mapped to access the
|
|
* buffer fields and the memory for the buffer might be just very slow. We
|
|
* also need to do some more magic to get the alignment right. */
|
|
asize = sizeof (GstBufferImpl) + size;
|
|
mem = gst_allocator_alloc (allocator, asize, align);
|
|
if (G_UNLIKELY (mem == NULL))
|
|
goto no_memory;
|
|
|
|
/* map the data part and init the buffer in it, set the buffer size to 0 so
|
|
* that a finalize won't free the buffer */
|
|
data = gst_memory_map (mem, &asize, NULL, GST_MAP_WRITE);
|
|
gst_buffer_init ((GstBufferImpl *) data, 0);
|
|
gst_memory_unmap (mem);
|
|
|
|
/* strip off the buffer */
|
|
gst_memory_resize (mem, sizeof (GstBufferImpl), size);
|
|
|
|
newbuf = GST_BUFFER_CAST (data);
|
|
GST_BUFFER_BUFMEM (newbuf) = mem;
|
|
|
|
if (size > 0)
|
|
_memory_add (newbuf, -1, gst_memory_ref (mem), TRUE);
|
|
#endif
|
|
GST_BUFFER_FLAG_UNSET (newbuf, GST_BUFFER_FLAG_TAG_MEMORY);
|
|
|
|
return newbuf;
|
|
|
|
/* ERRORS */
|
|
no_memory:
|
|
{
|
|
GST_CAT_WARNING (GST_CAT_BUFFER,
|
|
"failed to allocate %" G_GSIZE_FORMAT " bytes", size);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_new_wrapped_full:
|
|
* @flags: #GstMemoryFlags
|
|
* @data: (array length=size) (element-type guint8) (transfer none): data to wrap
|
|
* @maxsize: allocated size of @data
|
|
* @offset: offset in @data
|
|
* @size: size of valid data
|
|
* @user_data: (allow-none): user_data
|
|
* @notify: (allow-none) (scope async) (closure user_data): called with @user_data when the memory is freed
|
|
*
|
|
* Allocate a new buffer that wraps the given memory. @data must point to
|
|
* @maxsize of memory, the wrapped buffer will have the region from @offset and
|
|
* @size visible.
|
|
*
|
|
* When the buffer is destroyed, @notify will be called with @user_data.
|
|
*
|
|
* The prefix/padding must be filled with 0 if @flags contains
|
|
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
|
|
*
|
|
* Returns: (transfer full): a new #GstBuffer
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data,
|
|
gsize maxsize, gsize offset, gsize size, gpointer user_data,
|
|
GDestroyNotify notify)
|
|
{
|
|
GstMemory *mem;
|
|
GstBuffer *newbuf;
|
|
|
|
newbuf = gst_buffer_new ();
|
|
mem =
|
|
gst_memory_new_wrapped (flags, data, maxsize, offset, size, user_data,
|
|
notify);
|
|
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
_memory_add (newbuf, -1, mem);
|
|
GST_BUFFER_FLAG_UNSET (newbuf, GST_BUFFER_FLAG_TAG_MEMORY);
|
|
|
|
return newbuf;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_new_wrapped:
|
|
* @data: (array length=size) (element-type guint8) (transfer full): data to wrap
|
|
* @size: allocated size of @data
|
|
*
|
|
* Creates a new buffer that wraps the given @data. The memory will be freed
|
|
* with g_free and will be marked writable.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: (transfer full): a new #GstBuffer
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_new_wrapped (gpointer data, gsize size)
|
|
{
|
|
return gst_buffer_new_wrapped_full (0, data, size, 0, size, data, g_free);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_n_memory:
|
|
* @buffer: a #GstBuffer.
|
|
*
|
|
* Get the amount of memory blocks that this buffer has. This amount is never
|
|
* larger than what gst_buffer_get_max_memory() returns.
|
|
*
|
|
* Returns: the number of memory blocks this buffer is made of.
|
|
*/
|
|
guint
|
|
gst_buffer_n_memory (GstBuffer * buffer)
|
|
{
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
|
|
|
|
return GST_BUFFER_MEM_LEN (buffer);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_prepend_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @mem: (transfer full): a #GstMemory.
|
|
*
|
|
* Prepend the memory block @mem to @buffer. This function takes
|
|
* ownership of @mem and thus doesn't increase its refcount.
|
|
*
|
|
* This function is identical to gst_buffer_insert_memory() with an index of 0.
|
|
* See gst_buffer_insert_memory() for more details.
|
|
*/
|
|
void
|
|
gst_buffer_prepend_memory (GstBuffer * buffer, GstMemory * mem)
|
|
{
|
|
gst_buffer_insert_memory (buffer, 0, mem);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_append_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @mem: (transfer full): a #GstMemory.
|
|
*
|
|
* Append the memory block @mem to @buffer. This function takes
|
|
* ownership of @mem and thus doesn't increase its refcount.
|
|
*
|
|
* This function is identical to gst_buffer_insert_memory() with an index of -1.
|
|
* See gst_buffer_insert_memory() for more details.
|
|
*/
|
|
void
|
|
gst_buffer_append_memory (GstBuffer * buffer, GstMemory * mem)
|
|
{
|
|
gst_buffer_insert_memory (buffer, -1, mem);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_insert_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: the index to add the memory at, or -1 to append it to the end
|
|
* @mem: (transfer full): a #GstMemory.
|
|
*
|
|
* Insert the memory block @mem to @buffer at @idx. This function takes ownership
|
|
* of @mem and thus doesn't increase its refcount.
|
|
*
|
|
* Only gst_buffer_get_max_memory() can be added to a buffer. If more memory is
|
|
* added, existing memory blocks will automatically be merged to make room for
|
|
* the new memory.
|
|
*/
|
|
void
|
|
gst_buffer_insert_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
|
|
{
|
|
GstMemory *tmp;
|
|
|
|
g_return_if_fail (GST_IS_BUFFER (buffer));
|
|
g_return_if_fail (gst_buffer_is_writable (buffer));
|
|
g_return_if_fail (mem != NULL);
|
|
g_return_if_fail (idx == -1 ||
|
|
(idx >= 0 && idx <= GST_BUFFER_MEM_LEN (buffer)));
|
|
|
|
tmp = _memory_get_exclusive_reference (mem);
|
|
g_return_if_fail (tmp != NULL);
|
|
gst_memory_unref (mem);
|
|
_memory_add (buffer, idx, tmp);
|
|
}
|
|
|
|
static GstMemory *
|
|
_get_mapped (GstBuffer * buffer, guint idx, GstMapInfo * info,
|
|
GstMapFlags flags)
|
|
{
|
|
GstMemory *mem, *mapped;
|
|
|
|
mem = gst_memory_ref (GST_BUFFER_MEM_PTR (buffer, idx));
|
|
|
|
mapped = gst_memory_make_mapped (mem, info, flags);
|
|
|
|
if (mapped != mem) {
|
|
/* memory changed, lock new memory */
|
|
gst_memory_lock (mapped, GST_LOCK_FLAG_EXCLUSIVE);
|
|
GST_BUFFER_MEM_PTR (buffer, idx) = mapped;
|
|
/* unlock old memory */
|
|
gst_memory_unlock (mem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
|
|
}
|
|
gst_memory_unref (mem);
|
|
|
|
return mapped;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_peek_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
*
|
|
* Get the memory block at @idx in @buffer. The memory block stays valid until
|
|
* the memory block in @buffer is removed, replaced or merged, typically with
|
|
* any call that modifies the memory in @buffer.
|
|
*
|
|
* Returns: (transfer none) (nullable): the #GstMemory at @idx.
|
|
*/
|
|
GstMemory *
|
|
gst_buffer_peek_memory (GstBuffer * buffer, guint idx)
|
|
{
|
|
guint len;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_val_if_fail (idx < len, NULL);
|
|
|
|
return GST_BUFFER_MEM_PTR (buffer, idx);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
*
|
|
* Get the memory block at index @idx in @buffer.
|
|
*
|
|
* Returns: (transfer full) (nullable): a #GstMemory that contains the data of the
|
|
* memory block at @idx. Use gst_memory_unref () after usage.
|
|
*/
|
|
GstMemory *
|
|
gst_buffer_get_memory (GstBuffer * buffer, guint idx)
|
|
{
|
|
return gst_buffer_get_memory_range (buffer, idx, 1);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_all_memory:
|
|
* @buffer: a #GstBuffer.
|
|
*
|
|
* Get all the memory block in @buffer. The memory blocks will be merged
|
|
* into one large #GstMemory.
|
|
*
|
|
* Returns: (transfer full) (nullable): a #GstMemory that contains the merged memory.
|
|
* Use gst_memory_unref () after usage.
|
|
*/
|
|
GstMemory *
|
|
gst_buffer_get_all_memory (GstBuffer * buffer)
|
|
{
|
|
return gst_buffer_get_memory_range (buffer, 0, -1);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_memory_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length
|
|
*
|
|
* Get @length memory blocks in @buffer starting at @idx. The memory blocks will
|
|
* be merged into one large #GstMemory.
|
|
*
|
|
* If @length is -1, all memory starting from @idx is merged.
|
|
*
|
|
* Returns: (transfer full) (nullable): a #GstMemory that contains the merged data of @length
|
|
* blocks starting at @idx. Use gst_memory_unref () after usage.
|
|
*/
|
|
GstMemory *
|
|
gst_buffer_get_memory_range (GstBuffer * buffer, guint idx, gint length)
|
|
{
|
|
guint len;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d", idx, length);
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || (length > 0 && length + idx <= len), NULL);
|
|
|
|
if (length == -1)
|
|
length = len - idx;
|
|
|
|
return _get_merged_memory (buffer, idx, length);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_replace_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @mem: (transfer full): a #GstMemory
|
|
*
|
|
* Replaces the memory block at index @idx in @buffer with @mem.
|
|
*/
|
|
void
|
|
gst_buffer_replace_memory (GstBuffer * buffer, guint idx, GstMemory * mem)
|
|
{
|
|
gst_buffer_replace_memory_range (buffer, idx, 1, mem);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_replace_all_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @mem: (transfer full): a #GstMemory
|
|
*
|
|
* Replaces all memory in @buffer with @mem.
|
|
*/
|
|
void
|
|
gst_buffer_replace_all_memory (GstBuffer * buffer, GstMemory * mem)
|
|
{
|
|
gst_buffer_replace_memory_range (buffer, 0, -1, mem);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_replace_memory_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length should not be 0
|
|
* @mem: (transfer full): a #GstMemory
|
|
*
|
|
* Replaces @length memory blocks in @buffer starting at @idx with @mem.
|
|
*
|
|
* If @length is -1, all memory starting from @idx will be removed and
|
|
* replaced with @mem.
|
|
*
|
|
* @buffer should be writable.
|
|
*/
|
|
void
|
|
gst_buffer_replace_memory_range (GstBuffer * buffer, guint idx, gint length,
|
|
GstMemory * mem)
|
|
{
|
|
guint len;
|
|
|
|
g_return_if_fail (GST_IS_BUFFER (buffer));
|
|
g_return_if_fail (gst_buffer_is_writable (buffer));
|
|
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d, %p", idx, length, mem);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || (length > 0 && length + idx <= len));
|
|
|
|
if (length == -1)
|
|
length = len - idx;
|
|
|
|
_replace_memory (buffer, len, idx, length, mem);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_remove_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
*
|
|
* Remove the memory block in @b at index @i.
|
|
*/
|
|
void
|
|
gst_buffer_remove_memory (GstBuffer * buffer, guint idx)
|
|
{
|
|
gst_buffer_remove_memory_range (buffer, idx, 1);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_remove_all_memory:
|
|
* @buffer: a #GstBuffer.
|
|
*
|
|
* Remove all the memory blocks in @buffer.
|
|
*/
|
|
void
|
|
gst_buffer_remove_all_memory (GstBuffer * buffer)
|
|
{
|
|
gst_buffer_remove_memory_range (buffer, 0, -1);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_remove_memory_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length
|
|
*
|
|
* Remove @length memory blocks in @buffer starting from @idx.
|
|
*
|
|
* @length can be -1, in which case all memory starting from @idx is removed.
|
|
*/
|
|
void
|
|
gst_buffer_remove_memory_range (GstBuffer * buffer, guint idx, gint length)
|
|
{
|
|
guint len;
|
|
|
|
g_return_if_fail (GST_IS_BUFFER (buffer));
|
|
g_return_if_fail (gst_buffer_is_writable (buffer));
|
|
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d", idx, length);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || length + idx <= len);
|
|
|
|
if (length == -1)
|
|
length = len - idx;
|
|
|
|
_replace_memory (buffer, len, idx, length, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_find_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: an offset
|
|
* @size: a size
|
|
* @idx: (out): pointer to index
|
|
* @length: (out): pointer to length
|
|
* @skip: (out): pointer to skip
|
|
*
|
|
* Find the memory blocks that span @size bytes starting from @offset
|
|
* in @buffer.
|
|
*
|
|
* When this function returns %TRUE, @idx will contain the index of the first
|
|
* memory block where the byte for @offset can be found and @length contains the
|
|
* number of memory blocks containing the @size remaining bytes. @skip contains
|
|
* the number of bytes to skip in the memory block at @idx to get to the byte
|
|
* for @offset.
|
|
*
|
|
* @size can be -1 to get all the memory blocks after @idx.
|
|
*
|
|
* Returns: %TRUE when @size bytes starting from @offset could be found in
|
|
* @buffer and @idx, @length and @skip will be filled.
|
|
*/
|
|
gboolean
|
|
gst_buffer_find_memory (GstBuffer * buffer, gsize offset, gsize size,
|
|
guint * idx, guint * length, gsize * skip)
|
|
{
|
|
guint i, len, found;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
|
|
g_return_val_if_fail (idx != NULL, FALSE);
|
|
g_return_val_if_fail (length != NULL, FALSE);
|
|
g_return_val_if_fail (skip != NULL, FALSE);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
|
|
found = 0;
|
|
for (i = 0; i < len; i++) {
|
|
GstMemory *mem;
|
|
gsize s;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, i);
|
|
s = gst_memory_get_sizes (mem, NULL, NULL);
|
|
|
|
if (s <= offset) {
|
|
/* block before offset, or empty block, skip */
|
|
offset -= s;
|
|
} else {
|
|
/* block after offset */
|
|
if (found == 0) {
|
|
/* first block, remember index and offset */
|
|
*idx = i;
|
|
*skip = offset;
|
|
if (size == -1) {
|
|
/* return remaining blocks */
|
|
*length = len - i;
|
|
return TRUE;
|
|
}
|
|
s -= offset;
|
|
offset = 0;
|
|
}
|
|
/* count the amount of found bytes */
|
|
found += s;
|
|
if (found >= size) {
|
|
/* we have enough bytes */
|
|
*length = i - *idx + 1;
|
|
return TRUE;
|
|
}
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_is_memory_range_writable:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length should not be 0
|
|
*
|
|
* Check if @length memory blocks in @buffer starting from @idx are writable.
|
|
*
|
|
* @length can be -1 to check all the memory blocks after @idx.
|
|
*
|
|
* Note that this function does not check if @buffer is writable, use
|
|
* gst_buffer_is_writable() to check that if needed.
|
|
*
|
|
* Returns: %TRUE if the memory range is writable
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
gboolean
|
|
gst_buffer_is_memory_range_writable (GstBuffer * buffer, guint idx, gint length)
|
|
{
|
|
guint i, len;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d", idx, length);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || (length > 0 && length + idx <= len),
|
|
FALSE);
|
|
|
|
if (length == -1)
|
|
len -= idx;
|
|
else
|
|
len = length;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (!gst_memory_is_writable (GST_BUFFER_MEM_PTR (buffer, i + idx)))
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_is_all_memory_writable:
|
|
* @buffer: a #GstBuffer.
|
|
*
|
|
* Check if all memory blocks in @buffer are writable.
|
|
*
|
|
* Note that this function does not check if @buffer is writable, use
|
|
* gst_buffer_is_writable() to check that if needed.
|
|
*
|
|
* Returns: %TRUE if all memory blocks in @buffer are writable
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
gboolean
|
|
gst_buffer_is_all_memory_writable (GstBuffer * buffer)
|
|
{
|
|
return gst_buffer_is_memory_range_writable (buffer, 0, -1);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_sizes:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: (out) (allow-none): a pointer to the offset
|
|
* @maxsize: (out) (allow-none): a pointer to the maxsize
|
|
*
|
|
* Get the total size of the memory blocks in @b.
|
|
*
|
|
* When not %NULL, @offset will contain the offset of the data in the
|
|
* first memory block in @buffer and @maxsize will contain the sum of
|
|
* the size and @offset and the amount of extra padding on the last
|
|
* memory block. @offset and @maxsize can be used to resize the
|
|
* buffer memory blocks with gst_buffer_resize().
|
|
*
|
|
* Returns: total size of the memory blocks in @buffer.
|
|
*/
|
|
gsize
|
|
gst_buffer_get_sizes (GstBuffer * buffer, gsize * offset, gsize * maxsize)
|
|
{
|
|
return gst_buffer_get_sizes_range (buffer, 0, -1, offset, maxsize);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_size:
|
|
* @buffer: a #GstBuffer.
|
|
*
|
|
* Get the total size of the memory blocks in @buffer.
|
|
*
|
|
* Returns: total size of the memory blocks in @buffer.
|
|
*/
|
|
gsize
|
|
gst_buffer_get_size (GstBuffer * buffer)
|
|
{
|
|
return gst_buffer_get_sizes_range (buffer, 0, -1, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_sizes_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length
|
|
* @offset: (out) (allow-none): a pointer to the offset
|
|
* @maxsize: (out) (allow-none): a pointer to the maxsize
|
|
*
|
|
* Get the total size of @length memory blocks stating from @idx in @buffer.
|
|
*
|
|
* When not %NULL, @offset will contain the offset of the data in the
|
|
* memory block in @buffer at @idx and @maxsize will contain the sum of the size
|
|
* and @offset and the amount of extra padding on the memory block at @idx +
|
|
* @length -1.
|
|
* @offset and @maxsize can be used to resize the buffer memory blocks with
|
|
* gst_buffer_resize_range().
|
|
*
|
|
* Returns: total size of @length memory blocks starting at @idx in @buffer.
|
|
*/
|
|
gsize
|
|
gst_buffer_get_sizes_range (GstBuffer * buffer, guint idx, gint length,
|
|
gsize * offset, gsize * maxsize)
|
|
{
|
|
guint len;
|
|
gsize size;
|
|
GstMemory *mem;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || (length + idx <= len), 0);
|
|
|
|
if (length == -1)
|
|
length = len - idx;
|
|
|
|
if (G_LIKELY (length == 1)) {
|
|
/* common case */
|
|
mem = GST_BUFFER_MEM_PTR (buffer, idx);
|
|
size = gst_memory_get_sizes (mem, offset, maxsize);
|
|
} else {
|
|
guint i, end;
|
|
gsize extra, offs;
|
|
|
|
end = idx + length;
|
|
size = offs = extra = 0;
|
|
for (i = idx; i < end; i++) {
|
|
gsize s, o, ms;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, i);
|
|
s = gst_memory_get_sizes (mem, &o, &ms);
|
|
|
|
if (s) {
|
|
if (size == 0)
|
|
/* first size, take accumulated data before as the offset */
|
|
offs = extra + o;
|
|
/* add sizes */
|
|
size += s;
|
|
/* save the amount of data after this block */
|
|
extra = ms - (o + s);
|
|
} else {
|
|
/* empty block, add as extra */
|
|
extra += ms;
|
|
}
|
|
}
|
|
if (offset)
|
|
*offset = offs;
|
|
if (maxsize)
|
|
*maxsize = offs + size + extra;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_resize:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset adjustment
|
|
* @size: the new size or -1 to just adjust the offset
|
|
*
|
|
* Set the offset and total size of the memory blocks in @buffer.
|
|
*/
|
|
void
|
|
gst_buffer_resize (GstBuffer * buffer, gssize offset, gssize size)
|
|
{
|
|
gst_buffer_resize_range (buffer, 0, -1, offset, size);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_set_size:
|
|
* @buffer: a #GstBuffer.
|
|
* @size: the new size
|
|
*
|
|
* Set the total size of the memory blocks in @buffer.
|
|
*/
|
|
void
|
|
gst_buffer_set_size (GstBuffer * buffer, gssize size)
|
|
{
|
|
gst_buffer_resize_range (buffer, 0, -1, 0, size);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_resize_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length
|
|
* @offset: the offset adjustment
|
|
* @size: the new size or -1 to just adjust the offset
|
|
*
|
|
* Set the total size of the @length memory blocks starting at @idx in
|
|
* @buffer
|
|
*
|
|
* Returns: %TRUE if resizing succeeded, %FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_buffer_resize_range (GstBuffer * buffer, guint idx, gint length,
|
|
gssize offset, gssize size)
|
|
{
|
|
guint i, len, end;
|
|
gsize bsize, bufsize, bufoffs, bufmax;
|
|
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
|
|
g_return_val_if_fail (size >= -1, FALSE);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || (length + idx <= len), FALSE);
|
|
|
|
if (length == -1)
|
|
length = len - idx;
|
|
|
|
bufsize = gst_buffer_get_sizes_range (buffer, idx, length, &bufoffs, &bufmax);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "trim %p %" G_GSSIZE_FORMAT "-%" G_GSSIZE_FORMAT
|
|
" size:%" G_GSIZE_FORMAT " offs:%" G_GSIZE_FORMAT " max:%"
|
|
G_GSIZE_FORMAT, buffer, offset, size, bufsize, bufoffs, bufmax);
|
|
|
|
/* we can't go back further than the current offset or past the end of the
|
|
* buffer */
|
|
g_return_val_if_fail ((offset < 0 && bufoffs >= -offset) || (offset >= 0
|
|
&& bufoffs + offset <= bufmax), FALSE);
|
|
if (size == -1) {
|
|
g_return_val_if_fail (bufsize >= offset, FALSE);
|
|
size = bufsize - offset;
|
|
}
|
|
g_return_val_if_fail (bufmax >= bufoffs + offset + size, FALSE);
|
|
|
|
/* no change */
|
|
if (offset == 0 && size == bufsize)
|
|
return TRUE;
|
|
|
|
end = idx + length;
|
|
/* copy and trim */
|
|
for (i = idx; i < end; i++) {
|
|
GstMemory *mem;
|
|
gsize left, noffs;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, i);
|
|
bsize = gst_memory_get_sizes (mem, NULL, NULL);
|
|
|
|
noffs = 0;
|
|
/* last buffer always gets resized to the remaining size */
|
|
if (i + 1 == end)
|
|
left = size;
|
|
/* shrink buffers before the offset */
|
|
else if ((gssize) bsize <= offset) {
|
|
left = 0;
|
|
noffs = offset - bsize;
|
|
offset = 0;
|
|
}
|
|
/* clip other buffers */
|
|
else
|
|
left = MIN (bsize - offset, size);
|
|
|
|
if (offset != 0 || left != bsize) {
|
|
if (gst_memory_is_writable (mem)) {
|
|
gst_memory_resize (mem, offset, left);
|
|
} else {
|
|
GstMemory *newmem = NULL;
|
|
|
|
if (!GST_MEMORY_IS_NO_SHARE (mem))
|
|
newmem = gst_memory_share (mem, offset, left);
|
|
|
|
if (!newmem)
|
|
newmem = gst_memory_copy (mem, offset, left);
|
|
|
|
if (newmem == NULL)
|
|
return FALSE;
|
|
|
|
gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
GST_BUFFER_MEM_PTR (buffer, i) = newmem;
|
|
gst_memory_unlock (mem, GST_LOCK_FLAG_EXCLUSIVE);
|
|
gst_memory_unref (mem);
|
|
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
|
|
}
|
|
}
|
|
|
|
offset = noffs;
|
|
size -= left;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_map:
|
|
* @buffer: a #GstBuffer.
|
|
* @info: (out): info about the mapping
|
|
* @flags: flags for the mapping
|
|
*
|
|
* This function fills @info with the #GstMapInfo of all merged memory
|
|
* blocks in @buffer.
|
|
*
|
|
* @flags describe the desired access of the memory. When @flags is
|
|
* #GST_MAP_WRITE, @buffer should be writable (as returned from
|
|
* gst_buffer_is_writable()).
|
|
*
|
|
* When @buffer is writable but the memory isn't, a writable copy will
|
|
* automatically be created and returned. The readonly copy of the
|
|
* buffer memory will then also be replaced with this writable copy.
|
|
*
|
|
* The memory in @info should be unmapped with gst_buffer_unmap() after
|
|
* usage.
|
|
*
|
|
* Returns: %TRUE if the map succeeded and @info contains valid data.
|
|
*/
|
|
gboolean
|
|
gst_buffer_map (GstBuffer * buffer, GstMapInfo * info, GstMapFlags flags)
|
|
{
|
|
return gst_buffer_map_range (buffer, 0, -1, info, flags);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_map_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length
|
|
* @info: (out): info about the mapping
|
|
* @flags: flags for the mapping
|
|
*
|
|
* This function fills @info with the #GstMapInfo of @length merged memory blocks
|
|
* starting at @idx in @buffer. When @length is -1, all memory blocks starting
|
|
* from @idx are merged and mapped.
|
|
*
|
|
* @flags describe the desired access of the memory. When @flags is
|
|
* #GST_MAP_WRITE, @buffer should be writable (as returned from
|
|
* gst_buffer_is_writable()).
|
|
*
|
|
* When @buffer is writable but the memory isn't, a writable copy will
|
|
* automatically be created and returned. The readonly copy of the buffer memory
|
|
* will then also be replaced with this writable copy.
|
|
*
|
|
* The memory in @info should be unmapped with gst_buffer_unmap() after usage.
|
|
*
|
|
* Returns: %TRUE if the map succeeded and @info contains valid
|
|
* data.
|
|
*/
|
|
gboolean
|
|
gst_buffer_map_range (GstBuffer * buffer, guint idx, gint length,
|
|
GstMapInfo * info, GstMapFlags flags)
|
|
{
|
|
GstMemory *mem, *nmem;
|
|
gboolean write, writable;
|
|
gsize len;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
|
|
g_return_val_if_fail (info != NULL, FALSE);
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
|
|
(length == -1 && idx < len) || (length > 0
|
|
&& length + idx <= len), FALSE);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %d, flags %04x",
|
|
buffer, idx, length, flags);
|
|
|
|
write = (flags & GST_MAP_WRITE) != 0;
|
|
writable = gst_buffer_is_writable (buffer);
|
|
|
|
/* check if we can write when asked for write access */
|
|
if (G_UNLIKELY (write && !writable))
|
|
goto not_writable;
|
|
|
|
if (length == -1)
|
|
length = len - idx;
|
|
|
|
mem = _get_merged_memory (buffer, idx, length);
|
|
if (G_UNLIKELY (mem == NULL))
|
|
goto no_memory;
|
|
|
|
/* now try to map */
|
|
nmem = gst_memory_make_mapped (mem, info, flags);
|
|
if (G_UNLIKELY (nmem == NULL))
|
|
goto cannot_map;
|
|
|
|
/* if we merged or when the map returned a different memory, we try to replace
|
|
* the memory in the buffer */
|
|
if (G_UNLIKELY (length > 1 || nmem != mem)) {
|
|
/* if the buffer is writable, replace the memory */
|
|
if (writable) {
|
|
_replace_memory (buffer, len, idx, length, gst_memory_ref (nmem));
|
|
} else {
|
|
if (len > 1) {
|
|
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
|
|
"temporary mapping for memory %p in buffer %p", nmem, buffer);
|
|
}
|
|
}
|
|
}
|
|
return TRUE;
|
|
|
|
/* ERROR */
|
|
not_writable:
|
|
{
|
|
GST_WARNING_OBJECT (buffer, "write map requested on non-writable buffer");
|
|
g_critical ("write map requested on non-writable buffer");
|
|
memset (info, 0, sizeof (GstMapInfo));
|
|
return FALSE;
|
|
}
|
|
no_memory:
|
|
{
|
|
/* empty buffer, we need to return NULL */
|
|
GST_DEBUG_OBJECT (buffer, "can't get buffer memory");
|
|
memset (info, 0, sizeof (GstMapInfo));
|
|
return TRUE;
|
|
}
|
|
cannot_map:
|
|
{
|
|
GST_DEBUG_OBJECT (buffer, "cannot map memory");
|
|
memset (info, 0, sizeof (GstMapInfo));
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_unmap:
|
|
* @buffer: a #GstBuffer.
|
|
* @info: a #GstMapInfo
|
|
*
|
|
* Release the memory previously mapped with gst_buffer_map().
|
|
*/
|
|
void
|
|
gst_buffer_unmap (GstBuffer * buffer, GstMapInfo * info)
|
|
{
|
|
g_return_if_fail (GST_IS_BUFFER (buffer));
|
|
g_return_if_fail (info != NULL);
|
|
|
|
/* we need to check for NULL, it is possible that we tried to map a buffer
|
|
* without memory and we should be able to unmap that fine */
|
|
if (G_LIKELY (info->memory)) {
|
|
gst_memory_unmap (info->memory, info);
|
|
gst_memory_unref (info->memory);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_fill:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset to fill
|
|
* @src: (array length=size) (element-type guint8): the source address
|
|
* @size: the size to fill
|
|
*
|
|
* Copy @size bytes from @src to @buffer at @offset.
|
|
*
|
|
* Returns: The amount of bytes copied. This value can be lower than @size
|
|
* when @buffer did not contain enough data.
|
|
*/
|
|
gsize
|
|
gst_buffer_fill (GstBuffer * buffer, gsize offset, gconstpointer src,
|
|
gsize size)
|
|
{
|
|
gsize i, len, left;
|
|
const guint8 *ptr = src;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), 0);
|
|
g_return_val_if_fail (src != NULL || size == 0, 0);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER,
|
|
"buffer %p, offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer,
|
|
offset, size);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
left = size;
|
|
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
GstMapInfo info;
|
|
gsize tocopy;
|
|
GstMemory *mem;
|
|
|
|
mem = _get_mapped (buffer, i, &info, GST_MAP_WRITE);
|
|
if (info.size > offset) {
|
|
/* we have enough */
|
|
tocopy = MIN (info.size - offset, left);
|
|
memcpy ((guint8 *) info.data + offset, ptr, tocopy);
|
|
left -= tocopy;
|
|
ptr += tocopy;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= info.size;
|
|
}
|
|
gst_memory_unmap (mem, &info);
|
|
}
|
|
return size - left;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_extract:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset to extract
|
|
* @dest: the destination address
|
|
* @size: the size to extract
|
|
*
|
|
* Copy @size bytes starting from @offset in @buffer to @dest.
|
|
*
|
|
* Returns: The amount of bytes extracted. This value can be lower than @size
|
|
* when @buffer did not contain enough data.
|
|
*/
|
|
gsize
|
|
gst_buffer_extract (GstBuffer * buffer, gsize offset, gpointer dest, gsize size)
|
|
{
|
|
gsize i, len, left;
|
|
guint8 *ptr = dest;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
|
|
g_return_val_if_fail (dest != NULL, 0);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER,
|
|
"buffer %p, offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer,
|
|
offset, size);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
left = size;
|
|
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
GstMapInfo info;
|
|
gsize tocopy;
|
|
GstMemory *mem;
|
|
|
|
mem = _get_mapped (buffer, i, &info, GST_MAP_READ);
|
|
if (info.size > offset) {
|
|
/* we have enough */
|
|
tocopy = MIN (info.size - offset, left);
|
|
memcpy (ptr, (guint8 *) info.data + offset, tocopy);
|
|
left -= tocopy;
|
|
ptr += tocopy;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= info.size;
|
|
}
|
|
gst_memory_unmap (mem, &info);
|
|
}
|
|
return size - left;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_memcmp:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset in @buffer
|
|
* @mem: (array length=size) (element-type guint8): the memory to compare
|
|
* @size: the size to compare
|
|
*
|
|
* Compare @size bytes starting from @offset in @buffer with the memory in @mem.
|
|
*
|
|
* Returns: 0 if the memory is equal.
|
|
*/
|
|
gint
|
|
gst_buffer_memcmp (GstBuffer * buffer, gsize offset, gconstpointer mem,
|
|
gsize size)
|
|
{
|
|
gsize i, len;
|
|
const guint8 *ptr = mem;
|
|
gint res = 0;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
|
|
g_return_val_if_fail (mem != NULL, 0);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER,
|
|
"buffer %p, offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer,
|
|
offset, size);
|
|
|
|
if (G_UNLIKELY (gst_buffer_get_size (buffer) < offset + size))
|
|
return -1;
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
|
|
for (i = 0; i < len && size > 0 && res == 0; i++) {
|
|
GstMapInfo info;
|
|
gsize tocmp;
|
|
GstMemory *mem;
|
|
|
|
mem = _get_mapped (buffer, i, &info, GST_MAP_READ);
|
|
if (info.size > offset) {
|
|
/* we have enough */
|
|
tocmp = MIN (info.size - offset, size);
|
|
res = memcmp (ptr, (guint8 *) info.data + offset, tocmp);
|
|
size -= tocmp;
|
|
ptr += tocmp;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= info.size;
|
|
}
|
|
gst_memory_unmap (mem, &info);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_memset:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset in @buffer
|
|
* @val: the value to set
|
|
* @size: the size to set
|
|
*
|
|
* Fill @buf with @size bytes with @val starting from @offset.
|
|
*
|
|
* Returns: The amount of bytes filled. This value can be lower than @size
|
|
* when @buffer did not contain enough data.
|
|
*/
|
|
gsize
|
|
gst_buffer_memset (GstBuffer * buffer, gsize offset, guint8 val, gsize size)
|
|
{
|
|
gsize i, len, left;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), 0);
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER,
|
|
"buffer %p, offset %" G_GSIZE_FORMAT ", val %02x, size %" G_GSIZE_FORMAT,
|
|
buffer, offset, val, size);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
left = size;
|
|
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
GstMapInfo info;
|
|
gsize toset;
|
|
GstMemory *mem;
|
|
|
|
mem = _get_mapped (buffer, i, &info, GST_MAP_WRITE);
|
|
if (info.size > offset) {
|
|
/* we have enough */
|
|
toset = MIN (info.size - offset, left);
|
|
memset ((guint8 *) info.data + offset, val, toset);
|
|
left -= toset;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= info.size;
|
|
}
|
|
gst_memory_unmap (mem, &info);
|
|
}
|
|
return size - left;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_copy_region:
|
|
* @parent: a #GstBuffer.
|
|
* @flags: the #GstBufferCopyFlags
|
|
* @offset: the offset into parent #GstBuffer at which the new sub-buffer
|
|
* begins.
|
|
* @size: the size of the new #GstBuffer sub-buffer, in bytes. If -1, all
|
|
* data is copied.
|
|
*
|
|
* Creates a sub-buffer from @parent at @offset and @size.
|
|
* This sub-buffer uses the actual memory space of the parent buffer.
|
|
* This function will copy the offset and timestamp fields when the
|
|
* offset is 0. If not, they will be set to #GST_CLOCK_TIME_NONE and
|
|
* #GST_BUFFER_OFFSET_NONE.
|
|
* If @offset equals 0 and @size equals the total size of @buffer, the
|
|
* duration and offset end fields are also copied. If not they will be set
|
|
* to #GST_CLOCK_TIME_NONE and #GST_BUFFER_OFFSET_NONE.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: (transfer full): the new #GstBuffer or %NULL if the arguments were
|
|
* invalid.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_copy_region (GstBuffer * buffer, GstBufferCopyFlags flags,
|
|
gsize offset, gsize size)
|
|
{
|
|
GstBuffer *copy;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
|
|
/* create the new buffer */
|
|
copy = gst_buffer_new ();
|
|
|
|
GST_CAT_LOG (GST_CAT_BUFFER, "new region copy %p of %p %" G_GSIZE_FORMAT
|
|
"-%" G_GSIZE_FORMAT, copy, buffer, offset, size);
|
|
|
|
if (!gst_buffer_copy_into (copy, buffer, flags, offset, size))
|
|
gst_buffer_replace (©, NULL);
|
|
|
|
return copy;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_append:
|
|
* @buf1: (transfer full): the first source #GstBuffer to append.
|
|
* @buf2: (transfer full): the second source #GstBuffer to append.
|
|
*
|
|
* Append all the memory from @buf2 to @buf1. The result buffer will contain a
|
|
* concatenation of the memory of @buf1 and @buf2.
|
|
*
|
|
* Returns: (transfer full): the new #GstBuffer that contains the memory
|
|
* of the two source buffers.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_append (GstBuffer * buf1, GstBuffer * buf2)
|
|
{
|
|
return gst_buffer_append_region (buf1, buf2, 0, -1);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_append_region:
|
|
* @buf1: (transfer full): the first source #GstBuffer to append.
|
|
* @buf2: (transfer full): the second source #GstBuffer to append.
|
|
* @offset: the offset in @buf2
|
|
* @size: the size or -1 of @buf2
|
|
*
|
|
* Append @size bytes at @offset from @buf2 to @buf1. The result buffer will
|
|
* contain a concatenation of the memory of @buf1 and the requested region of
|
|
* @buf2.
|
|
*
|
|
* Returns: (transfer full): the new #GstBuffer that contains the memory
|
|
* of the two source buffers.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_append_region (GstBuffer * buf1, GstBuffer * buf2, gssize offset,
|
|
gssize size)
|
|
{
|
|
gsize i, len;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buf1), NULL);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buf2), NULL);
|
|
|
|
buf1 = gst_buffer_make_writable (buf1);
|
|
buf2 = gst_buffer_make_writable (buf2);
|
|
|
|
gst_buffer_resize (buf2, offset, size);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buf2);
|
|
for (i = 0; i < len; i++) {
|
|
GstMemory *mem;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buf2, i);
|
|
GST_BUFFER_MEM_PTR (buf2, i) = NULL;
|
|
_memory_add (buf1, -1, mem);
|
|
}
|
|
|
|
GST_BUFFER_MEM_LEN (buf2) = 0;
|
|
GST_BUFFER_FLAG_SET (buf2, GST_BUFFER_FLAG_TAG_MEMORY);
|
|
gst_buffer_unref (buf2);
|
|
|
|
return buf1;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @api: the #GType of an API
|
|
*
|
|
* Get the metadata for @api on buffer. When there is no such metadata, %NULL is
|
|
* returned. If multiple metadata with the given @api are attached to this
|
|
* buffer only the first one is returned. To handle multiple metadata with a
|
|
* given API use gst_buffer_iterate_meta() or gst_buffer_foreach_meta() instead
|
|
* and check the meta->info.api member for the API type.
|
|
*
|
|
* Returns: (transfer none) (nullable): the metadata for @api on
|
|
* @buffer.
|
|
*/
|
|
GstMeta *
|
|
gst_buffer_get_meta (GstBuffer * buffer, GType api)
|
|
{
|
|
GstMetaItem *item;
|
|
GstMeta *result = NULL;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
g_return_val_if_fail (api != 0, NULL);
|
|
|
|
/* find GstMeta of the requested API */
|
|
for (item = GST_BUFFER_META (buffer); item; item = item->next) {
|
|
GstMeta *meta = &item->meta;
|
|
if (meta->info->api == api) {
|
|
result = meta;
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_n_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @api_type: the #GType of an API
|
|
*
|
|
* Returns: number of metas of type @api_type on @buffer.
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
guint
|
|
gst_buffer_get_n_meta (GstBuffer * buffer, GType api_type)
|
|
{
|
|
gpointer state = NULL;
|
|
GstMeta *meta;
|
|
guint n = 0;
|
|
|
|
while ((meta = gst_buffer_iterate_meta_filtered (buffer, &state, api_type)))
|
|
++n;
|
|
|
|
return n;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_add_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @info: a #GstMetaInfo
|
|
* @params: params for @info
|
|
*
|
|
* Add metadata for @info to @buffer using the parameters in @params.
|
|
*
|
|
* Returns: (transfer none) (nullable): the metadata for the api in @info on @buffer.
|
|
*/
|
|
GstMeta *
|
|
gst_buffer_add_meta (GstBuffer * buffer, const GstMetaInfo * info,
|
|
gpointer params)
|
|
{
|
|
GstMetaItem *item;
|
|
GstMeta *result = NULL;
|
|
gsize size;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
g_return_val_if_fail (info != NULL, NULL);
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), NULL);
|
|
|
|
/* create a new slice */
|
|
size = ITEM_SIZE (info);
|
|
/* We warn in gst_meta_register() about metas without
|
|
* init function but let's play safe here and prevent
|
|
* uninitialized memory
|
|
*/
|
|
if (!info->init_func)
|
|
item = g_slice_alloc0 (size);
|
|
else
|
|
item = g_slice_alloc (size);
|
|
result = &item->meta;
|
|
result->info = info;
|
|
result->flags = GST_META_FLAG_NONE;
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER,
|
|
"alloc metadata %p (%s) of size %" G_GSIZE_FORMAT, result,
|
|
g_type_name (info->type), info->size);
|
|
|
|
/* call the init_func when needed */
|
|
if (info->init_func)
|
|
if (!info->init_func (result, params, buffer))
|
|
goto init_failed;
|
|
|
|
/* and add to the list of metadata */
|
|
item->next = GST_BUFFER_META (buffer);
|
|
GST_BUFFER_META (buffer) = item;
|
|
|
|
return result;
|
|
|
|
init_failed:
|
|
{
|
|
g_slice_free1 (size, item);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_remove_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @meta: a #GstMeta
|
|
*
|
|
* Remove the metadata for @meta on @buffer.
|
|
*
|
|
* Returns: %TRUE if the metadata existed and was removed, %FALSE if no such
|
|
* metadata was on @buffer.
|
|
*/
|
|
gboolean
|
|
gst_buffer_remove_meta (GstBuffer * buffer, GstMeta * meta)
|
|
{
|
|
GstMetaItem *walk, *prev;
|
|
|
|
g_return_val_if_fail (buffer != NULL, FALSE);
|
|
g_return_val_if_fail (meta != NULL, FALSE);
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
|
|
g_return_val_if_fail (!GST_META_FLAG_IS_SET (meta, GST_META_FLAG_LOCKED),
|
|
FALSE);
|
|
|
|
/* find the metadata and delete */
|
|
prev = GST_BUFFER_META (buffer);
|
|
for (walk = prev; walk; walk = walk->next) {
|
|
GstMeta *m = &walk->meta;
|
|
if (m == meta) {
|
|
const GstMetaInfo *info = meta->info;
|
|
|
|
/* remove from list */
|
|
if (GST_BUFFER_META (buffer) == walk)
|
|
GST_BUFFER_META (buffer) = walk->next;
|
|
else
|
|
prev->next = walk->next;
|
|
/* call free_func if any */
|
|
if (info->free_func)
|
|
info->free_func (m, buffer);
|
|
|
|
/* and free the slice */
|
|
g_slice_free1 (ITEM_SIZE (info), walk);
|
|
break;
|
|
}
|
|
prev = walk;
|
|
}
|
|
return walk != NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_iterate_meta: (skip)
|
|
* @buffer: a #GstBuffer
|
|
* @state: (out caller-allocates): an opaque state pointer
|
|
*
|
|
* Retrieve the next #GstMeta after @current. If @state points
|
|
* to %NULL, the first metadata is returned.
|
|
*
|
|
* @state will be updated with an opaque state pointer
|
|
*
|
|
* Returns: (transfer none) (nullable): The next #GstMeta or %NULL
|
|
* when there are no more items.
|
|
*/
|
|
GstMeta *
|
|
gst_buffer_iterate_meta (GstBuffer * buffer, gpointer * state)
|
|
{
|
|
GstMetaItem **meta;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
g_return_val_if_fail (state != NULL, NULL);
|
|
|
|
meta = (GstMetaItem **) state;
|
|
if (*meta == NULL)
|
|
/* state NULL, move to first item */
|
|
*meta = GST_BUFFER_META (buffer);
|
|
else
|
|
/* state !NULL, move to next item in list */
|
|
*meta = (*meta)->next;
|
|
|
|
if (*meta)
|
|
return &(*meta)->meta;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_iterate_meta_filtered: (skip)
|
|
* @buffer: a #GstBuffer
|
|
* @state: (out caller-allocates): an opaque state pointer
|
|
* @meta_api_type: only return #GstMeta of this type
|
|
*
|
|
* Retrieve the next #GstMeta of type @meta_api_type after the current one
|
|
* according to @state. If @state points to %NULL, the first metadata of
|
|
* type @meta_api_type is returned.
|
|
*
|
|
* @state will be updated with an opaque state pointer
|
|
*
|
|
* Returns: (transfer none) (nullable): The next #GstMeta of type
|
|
* @meta_api_type or %NULL when there are no more items.
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
GstMeta *
|
|
gst_buffer_iterate_meta_filtered (GstBuffer * buffer, gpointer * state,
|
|
GType meta_api_type)
|
|
{
|
|
GstMetaItem **meta;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
g_return_val_if_fail (state != NULL, NULL);
|
|
|
|
meta = (GstMetaItem **) state;
|
|
if (*meta == NULL)
|
|
/* state NULL, move to first item */
|
|
*meta = GST_BUFFER_META (buffer);
|
|
else
|
|
/* state !NULL, move to next item in list */
|
|
*meta = (*meta)->next;
|
|
|
|
while (*meta != NULL && (*meta)->meta.info->api != meta_api_type)
|
|
*meta = (*meta)->next;
|
|
|
|
if (*meta)
|
|
return &(*meta)->meta;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_foreach_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @func: (scope call): a #GstBufferForeachMetaFunc to call
|
|
* @user_data: (closure): user data passed to @func
|
|
*
|
|
* Call @func with @user_data for each meta in @buffer.
|
|
*
|
|
* @func can modify the passed meta pointer or its contents. The return value
|
|
* of @func define if this function returns or if the remaining metadata items
|
|
* in the buffer should be skipped.
|
|
*
|
|
* Returns: %FALSE when @func returned %FALSE for one of the metadata.
|
|
*/
|
|
gboolean
|
|
gst_buffer_foreach_meta (GstBuffer * buffer, GstBufferForeachMetaFunc func,
|
|
gpointer user_data)
|
|
{
|
|
GstMetaItem *walk, *prev, *next;
|
|
gboolean res = TRUE;
|
|
|
|
g_return_val_if_fail (buffer != NULL, FALSE);
|
|
g_return_val_if_fail (func != NULL, FALSE);
|
|
|
|
/* find the metadata and delete */
|
|
prev = GST_BUFFER_META (buffer);
|
|
for (walk = prev; walk; walk = next) {
|
|
GstMeta *m, *new;
|
|
|
|
m = new = &walk->meta;
|
|
next = walk->next;
|
|
|
|
res = func (buffer, &new, user_data);
|
|
|
|
if (new == NULL) {
|
|
const GstMetaInfo *info = m->info;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER, "remove metadata %p (%s)", m,
|
|
g_type_name (info->type));
|
|
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
|
|
g_return_val_if_fail (!GST_META_FLAG_IS_SET (m, GST_META_FLAG_LOCKED),
|
|
FALSE);
|
|
|
|
/* remove from list */
|
|
if (GST_BUFFER_META (buffer) == walk)
|
|
GST_BUFFER_META (buffer) = next;
|
|
else
|
|
prev->next = next;
|
|
|
|
prev = next;
|
|
|
|
/* call free_func if any */
|
|
if (info->free_func)
|
|
info->free_func (m, buffer);
|
|
|
|
/* and free the slice */
|
|
g_slice_free1 (ITEM_SIZE (info), walk);
|
|
} else {
|
|
prev = walk;
|
|
}
|
|
if (!res)
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_extract_dup:
|
|
* @buffer: a #GstBuffer
|
|
* @offset: the offset to extract
|
|
* @size: the size to extract
|
|
* @dest: (array length=dest_size) (element-type guint8) (out): A pointer where
|
|
* the destination array will be written. Might be %NULL if the size is 0.
|
|
* @dest_size: (out): A location where the size of @dest can be written
|
|
*
|
|
* Extracts a copy of at most @size bytes the data at @offset into
|
|
* newly-allocated memory. @dest must be freed using g_free() when done.
|
|
*
|
|
* Since: 1.0.10
|
|
*/
|
|
|
|
void
|
|
gst_buffer_extract_dup (GstBuffer * buffer, gsize offset, gsize size,
|
|
gpointer * dest, gsize * dest_size)
|
|
{
|
|
gsize real_size, alloc_size;
|
|
|
|
real_size = gst_buffer_get_size (buffer);
|
|
|
|
alloc_size = MIN (real_size - offset, size);
|
|
if (alloc_size == 0) {
|
|
*dest = NULL;
|
|
*dest_size = 0;
|
|
} else {
|
|
*dest = g_malloc (alloc_size);
|
|
*dest_size = gst_buffer_extract (buffer, offset, *dest, size);
|
|
}
|
|
}
|
|
|
|
GST_DEBUG_CATEGORY_STATIC (gst_parent_buffer_meta_debug);
|
|
|
|
/**
|
|
* gst_buffer_add_parent_buffer_meta:
|
|
* @buffer: (transfer none): a #GstBuffer
|
|
* @ref: (transfer none): a #GstBuffer to ref
|
|
*
|
|
* Add a #GstParentBufferMeta to @buffer that holds a reference on
|
|
* @ref until the buffer is freed.
|
|
*
|
|
* Returns: (transfer none) (nullable): The #GstParentBufferMeta that was added to the buffer
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
GstParentBufferMeta *
|
|
gst_buffer_add_parent_buffer_meta (GstBuffer * buffer, GstBuffer * ref)
|
|
{
|
|
GstParentBufferMeta *meta;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (ref), NULL);
|
|
|
|
meta =
|
|
(GstParentBufferMeta *) gst_buffer_add_meta (buffer,
|
|
GST_PARENT_BUFFER_META_INFO, NULL);
|
|
|
|
if (!meta)
|
|
return NULL;
|
|
|
|
meta->buffer = gst_buffer_ref (ref);
|
|
|
|
return meta;
|
|
}
|
|
|
|
static gboolean
|
|
_gst_parent_buffer_meta_transform (GstBuffer * dest, GstMeta * meta,
|
|
GstBuffer * buffer, GQuark type, gpointer data)
|
|
{
|
|
GstParentBufferMeta *dmeta, *smeta;
|
|
|
|
smeta = (GstParentBufferMeta *) meta;
|
|
|
|
if (GST_META_TRANSFORM_IS_COPY (type)) {
|
|
/* copy over the reference to the parent buffer.
|
|
* Usually, this meta means we need to keep the parent buffer
|
|
* alive because one of the child memories is in use, which
|
|
* might not be the case if memory is deep copied or sub-regioned,
|
|
* but we can't tell, so keep the meta */
|
|
dmeta = gst_buffer_add_parent_buffer_meta (dest, smeta->buffer);
|
|
if (!dmeta)
|
|
return FALSE;
|
|
|
|
GST_CAT_DEBUG (gst_parent_buffer_meta_debug,
|
|
"copy buffer reference metadata");
|
|
} else {
|
|
/* return FALSE, if transform type is not supported */
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
_gst_parent_buffer_meta_free (GstParentBufferMeta * parent_meta,
|
|
GstBuffer * buffer)
|
|
{
|
|
GST_CAT_DEBUG (gst_parent_buffer_meta_debug,
|
|
"Dropping reference on buffer %p", parent_meta->buffer);
|
|
gst_buffer_unref (parent_meta->buffer);
|
|
}
|
|
|
|
static gboolean
|
|
_gst_parent_buffer_meta_init (GstParentBufferMeta * parent_meta,
|
|
gpointer params, GstBuffer * buffer)
|
|
{
|
|
static volatile gsize _init;
|
|
|
|
if (g_once_init_enter (&_init)) {
|
|
GST_DEBUG_CATEGORY_INIT (gst_parent_buffer_meta_debug, "parentbuffermeta",
|
|
0, "parentbuffermeta");
|
|
g_once_init_leave (&_init, 1);
|
|
}
|
|
|
|
parent_meta->buffer = NULL;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
GType
|
|
gst_parent_buffer_meta_api_get_type (void)
|
|
{
|
|
static volatile GType type = 0;
|
|
static const gchar *tags[] = { NULL };
|
|
|
|
if (g_once_init_enter (&type)) {
|
|
GType _type = gst_meta_api_type_register ("GstParentBufferMetaAPI", tags);
|
|
g_once_init_leave (&type, _type);
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
/**
|
|
* gst_parent_buffer_meta_get_info:
|
|
*
|
|
* Get the global #GstMetaInfo describing the #GstParentBufferMeta meta.
|
|
*
|
|
* Returns: (transfer none): The #GstMetaInfo
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
const GstMetaInfo *
|
|
gst_parent_buffer_meta_get_info (void)
|
|
{
|
|
static const GstMetaInfo *meta_info = NULL;
|
|
|
|
if (g_once_init_enter ((GstMetaInfo **) & meta_info)) {
|
|
const GstMetaInfo *meta =
|
|
gst_meta_register (gst_parent_buffer_meta_api_get_type (),
|
|
"GstParentBufferMeta",
|
|
sizeof (GstParentBufferMeta),
|
|
(GstMetaInitFunction) _gst_parent_buffer_meta_init,
|
|
(GstMetaFreeFunction) _gst_parent_buffer_meta_free,
|
|
_gst_parent_buffer_meta_transform);
|
|
g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) meta);
|
|
}
|
|
|
|
return meta_info;
|
|
}
|
|
|
|
GST_DEBUG_CATEGORY_STATIC (gst_reference_timestamp_meta_debug);
|
|
|
|
/**
|
|
* gst_buffer_add_reference_timestamp_meta:
|
|
* @buffer: (transfer none): a #GstBuffer
|
|
* @reference: (transfer none): identifier for the timestamp reference.
|
|
* @timestamp: timestamp
|
|
* @duration: duration, or %GST_CLOCK_TIME_NONE
|
|
*
|
|
* Add a #GstReferenceTimestampMeta to @buffer that holds a @timestamp and
|
|
* optionally @duration based on a specific timestamp @reference. See the
|
|
* documentation of #GstReferenceTimestampMeta for details.
|
|
*
|
|
* Returns: (transfer none) (nullable): The #GstReferenceTimestampMeta that was added to the buffer
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
GstReferenceTimestampMeta *
|
|
gst_buffer_add_reference_timestamp_meta (GstBuffer * buffer,
|
|
GstCaps * reference, GstClockTime timestamp, GstClockTime duration)
|
|
{
|
|
GstReferenceTimestampMeta *meta;
|
|
|
|
g_return_val_if_fail (GST_IS_CAPS (reference), NULL);
|
|
g_return_val_if_fail (timestamp != GST_CLOCK_TIME_NONE, NULL);
|
|
|
|
meta =
|
|
(GstReferenceTimestampMeta *) gst_buffer_add_meta (buffer,
|
|
GST_REFERENCE_TIMESTAMP_META_INFO, NULL);
|
|
|
|
if (!meta)
|
|
return NULL;
|
|
|
|
meta->reference = gst_caps_ref (reference);
|
|
meta->timestamp = timestamp;
|
|
meta->duration = duration;
|
|
|
|
return meta;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_reference_timestamp_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @reference: (allow-none): a reference #GstCaps
|
|
*
|
|
* Find the first #GstReferenceTimestampMeta on @buffer that conforms to
|
|
* @reference. Conformance is tested by checking if the meta's reference is a
|
|
* subset of @reference.
|
|
*
|
|
* Buffers can contain multiple #GstReferenceTimestampMeta metadata items.
|
|
*
|
|
* Returns: (transfer none) (nullable): the #GstReferenceTimestampMeta or %NULL when there
|
|
* is no such metadata on @buffer.
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
GstReferenceTimestampMeta *
|
|
gst_buffer_get_reference_timestamp_meta (GstBuffer * buffer,
|
|
GstCaps * reference)
|
|
{
|
|
gpointer state = NULL;
|
|
GstMeta *meta;
|
|
const GstMetaInfo *info = GST_REFERENCE_TIMESTAMP_META_INFO;
|
|
|
|
while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
|
|
if (meta->info->api == info->api) {
|
|
GstReferenceTimestampMeta *rmeta = (GstReferenceTimestampMeta *) meta;
|
|
|
|
if (!reference)
|
|
return rmeta;
|
|
if (gst_caps_is_subset (rmeta->reference, reference))
|
|
return rmeta;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static gboolean
|
|
_gst_reference_timestamp_meta_transform (GstBuffer * dest, GstMeta * meta,
|
|
GstBuffer * buffer, GQuark type, gpointer data)
|
|
{
|
|
GstReferenceTimestampMeta *dmeta, *smeta;
|
|
|
|
/* we copy over the reference timestamp meta, independent of transformation
|
|
* that happens. If it applied to the original buffer, it still applies to
|
|
* the new buffer as it refers to the time when the media was captured */
|
|
smeta = (GstReferenceTimestampMeta *) meta;
|
|
dmeta =
|
|
gst_buffer_add_reference_timestamp_meta (dest, smeta->reference,
|
|
smeta->timestamp, smeta->duration);
|
|
if (!dmeta)
|
|
return FALSE;
|
|
|
|
GST_CAT_DEBUG (gst_reference_timestamp_meta_debug,
|
|
"copy reference timestamp metadata from buffer %p to %p", buffer, dest);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
_gst_reference_timestamp_meta_free (GstReferenceTimestampMeta * meta,
|
|
GstBuffer * buffer)
|
|
{
|
|
if (meta->reference)
|
|
gst_caps_unref (meta->reference);
|
|
}
|
|
|
|
static gboolean
|
|
_gst_reference_timestamp_meta_init (GstReferenceTimestampMeta * meta,
|
|
gpointer params, GstBuffer * buffer)
|
|
{
|
|
static volatile gsize _init;
|
|
|
|
if (g_once_init_enter (&_init)) {
|
|
GST_DEBUG_CATEGORY_INIT (gst_reference_timestamp_meta_debug,
|
|
"referencetimestampmeta", 0, "referencetimestampmeta");
|
|
g_once_init_leave (&_init, 1);
|
|
}
|
|
|
|
meta->reference = NULL;
|
|
meta->timestamp = GST_CLOCK_TIME_NONE;
|
|
meta->duration = GST_CLOCK_TIME_NONE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
GType
|
|
gst_reference_timestamp_meta_api_get_type (void)
|
|
{
|
|
static volatile GType type = 0;
|
|
static const gchar *tags[] = { NULL };
|
|
|
|
if (g_once_init_enter (&type)) {
|
|
GType _type =
|
|
gst_meta_api_type_register ("GstReferenceTimestampMetaAPI", tags);
|
|
g_once_init_leave (&type, _type);
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
/**
|
|
* gst_reference_timestamp_meta_get_info:
|
|
*
|
|
* Get the global #GstMetaInfo describing the #GstReferenceTimestampMeta meta.
|
|
*
|
|
* Returns: (transfer none): The #GstMetaInfo
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
const GstMetaInfo *
|
|
gst_reference_timestamp_meta_get_info (void)
|
|
{
|
|
static const GstMetaInfo *meta_info = NULL;
|
|
|
|
if (g_once_init_enter ((GstMetaInfo **) & meta_info)) {
|
|
const GstMetaInfo *meta =
|
|
gst_meta_register (gst_reference_timestamp_meta_api_get_type (),
|
|
"GstReferenceTimestampMeta",
|
|
sizeof (GstReferenceTimestampMeta),
|
|
(GstMetaInitFunction) _gst_reference_timestamp_meta_init,
|
|
(GstMetaFreeFunction) _gst_reference_timestamp_meta_free,
|
|
_gst_reference_timestamp_meta_transform);
|
|
g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) meta);
|
|
}
|
|
|
|
return meta_info;
|
|
}
|