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1616 lines
44 KiB
C
1616 lines
44 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstbuffer
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* @short_description: Data-passing buffer type, supporting sub-buffers.
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* @see_also: #GstPad, #GstMiniObject, #GstBufferPool
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*
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* Buffers are the basic unit of data transfer in GStreamer. The #GstBuffer
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* type provides all the state necessary to define the regions of memory as
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* part of a stream. Region copies are also supported, allowing a smaller
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* region of a buffer to become its own buffer, with mechanisms in place to
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* ensure that neither memory space goes away prematurely.
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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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* <example>
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* <title>Creating a buffer for a video frame</title>
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* <programlisting>
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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, 0);
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* gst_buffer_take_memory (buffer, -1, memory);
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* ...
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* </programlisting>
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* </example>
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*
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* Alternatively, use gst_buffer_new_allocate()
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* to create a buffer with 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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* 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 #GstCaps set on it). 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.
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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().
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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 #GstBufferFlag 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_span(), which avoids memory copies when the gst_buffer_is_span_fast()
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* function returns TRUE.
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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 data pointed to by the buffer is unreffed as
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* well.
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*
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* Last reviewed on November 8, 2011 (0.11.2)
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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 "gstminiobject.h"
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#include "gstversion.h"
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GType _gst_buffer_type = 0;
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static GstMemory *_gst_buffer_arr_span (GstMemory ** mem[], gsize len[],
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guint n, gsize offset, gsize size, gboolean writable);
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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_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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/* 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 GstMemory *
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_span_memory (GstBuffer * buffer, gsize offset, gsize size, gboolean writable)
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{
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GstMemory *span, **mem[1];
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gsize len[1];
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/* not enough room, span buffers */
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mem[0] = GST_BUFFER_MEM_ARRAY (buffer);
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len[0] = GST_BUFFER_MEM_LEN (buffer);
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if (size == -1)
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size = gst_buffer_get_size (buffer);
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span = _gst_buffer_arr_span (mem, len, 1, offset, size, writable);
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return span;
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}
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static void
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_replace_memory (GstBuffer * buffer, GstMemory * mem)
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{
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gsize len, i;
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/* unref old buffers */
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len = GST_BUFFER_MEM_LEN (buffer);
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for (i = 0; i < len; i++)
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gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
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/* replace with single spanned buffer */
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GST_BUFFER_MEM_PTR (buffer, 0) = mem;
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GST_BUFFER_MEM_LEN (buffer) = 1;
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}
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static inline void
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_memory_add (GstBuffer * buffer, guint idx, GstMemory * mem)
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{
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guint i, len = GST_BUFFER_MEM_LEN (buffer);
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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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_replace_memory (buffer, _span_memory (buffer, 0, -1, FALSE));
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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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}
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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_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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* @flags indicate which fields will be copied.
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*/
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void
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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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g_return_if_fail (dest != NULL);
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g_return_if_fail (src != NULL);
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/* nothing to copy if the buffers are the same */
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if (G_UNLIKELY (dest == src))
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return;
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g_return_if_fail (gst_buffer_is_writable (dest));
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bufsize = gst_buffer_get_size (src);
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g_return_if_fail (bufsize >= offset);
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if (size == -1)
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size = bufsize - offset;
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g_return_if_fail (bufsize >= offset + size);
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GST_CAT_LOG (GST_CAT_BUFFER, "copy %p to %p, offset %" G_GSIZE_FORMAT
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"-%" G_GSIZE_FORMAT "/%" G_GSIZE_FORMAT, src, dest, offset, size,
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bufsize);
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if (flags & GST_BUFFER_COPY_FLAGS) {
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/* copy flags */
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GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
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}
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if (flags & GST_BUFFER_COPY_TIMESTAMPS) {
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if (offset == 0) {
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GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
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GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
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GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
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if (size == bufsize) {
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GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
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GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
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}
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} else {
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GST_BUFFER_PTS (dest) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_DTS (dest) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_DURATION (dest) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET_NONE;
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GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_NONE;
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}
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}
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if (flags & GST_BUFFER_COPY_MEMORY) {
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GstMemory *mem;
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gsize skip, left, len, i, bsize;
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len = GST_BUFFER_MEM_LEN (src);
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left = size;
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skip = offset;
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/* copy and make regions of the memory */
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for (i = 0; i < len && left > 0; i++) {
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mem = GST_BUFFER_MEM_PTR (src, i);
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bsize = gst_memory_get_sizes (mem, NULL, NULL);
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if (bsize <= skip) {
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/* don't copy buffer */
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skip -= bsize;
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} else {
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gsize tocopy;
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tocopy = MIN (bsize - skip, left);
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if (mem->flags & GST_MEMORY_FLAG_NO_SHARE) {
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/* no share, always copy then */
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mem = gst_memory_copy (mem, skip, tocopy);
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skip = 0;
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} else if (tocopy < bsize) {
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/* we need to clip something */
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mem = gst_memory_share (mem, skip, tocopy);
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skip = 0;
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} else {
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mem = gst_memory_ref (mem);
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}
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_memory_add (dest, -1, mem);
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left -= tocopy;
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}
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}
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if (flags & GST_BUFFER_COPY_MERGE) {
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_replace_memory (dest, _span_memory (dest, 0, size, FALSE));
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}
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}
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for (walk = GST_BUFFER_META (src); walk; walk = walk->next) {
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GstMeta *meta = &walk->meta;
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const GstMetaInfo *info = meta->info;
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if (info->copy_func)
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info->copy_func (dest, meta, src, offset, size);
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}
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}
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static GstBuffer *
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_gst_buffer_copy (GstBuffer * buffer)
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{
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GstBuffer *copy;
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g_return_val_if_fail (buffer != NULL, NULL);
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/* create a fresh new buffer */
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copy = gst_buffer_new ();
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/* we simply copy everything from our parent */
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gst_buffer_copy_into (copy, buffer, GST_BUFFER_COPY_ALL, 0, -1);
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return copy;
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}
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/* the default dispose function revives the buffer and returns it to the
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* pool when there is a pool */
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static gboolean
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_gst_buffer_dispose (GstBuffer * buffer)
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{
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GstBufferPool *pool;
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/* no pool, do free */
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if ((pool = buffer->pool) == NULL)
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return TRUE;
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/* keep the buffer alive */
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gst_buffer_ref (buffer);
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/* return the buffer to the pool */
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GST_CAT_LOG (GST_CAT_BUFFER, "release %p to pool %p", buffer, pool);
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gst_buffer_pool_release_buffer (pool, buffer);
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return FALSE;
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}
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static void
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_gst_buffer_free (GstBuffer * buffer)
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{
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GstMetaItem *walk, *next;
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guint i, len;
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gsize msize;
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g_return_if_fail (buffer != NULL);
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GST_CAT_LOG (GST_CAT_BUFFER, "finalize %p", buffer);
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/* free metadata */
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for (walk = GST_BUFFER_META (buffer); walk; walk = next) {
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GstMeta *meta = &walk->meta;
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const GstMetaInfo *info = meta->info;
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/* call free_func if any */
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if (info->free_func)
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info->free_func (meta, buffer);
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next = walk->next;
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/* and free the slice */
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g_slice_free1 (ITEM_SIZE (info), walk);
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}
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/* get the size, when unreffing the memory, we could also unref the buffer
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* itself */
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msize = GST_MINI_OBJECT_SIZE (buffer);
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/* free our memory */
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len = GST_BUFFER_MEM_LEN (buffer);
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for (i = 0; i < len; i++)
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gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
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/* we set msize to 0 when the buffer is part of the memory block */
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if (msize)
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g_slice_free1 (msize, buffer);
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else
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gst_memory_unref (GST_BUFFER_BUFMEM (buffer));
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}
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static void
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gst_buffer_init (GstBufferImpl * buffer, gsize size)
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{
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gst_mini_object_init (GST_MINI_OBJECT_CAST (buffer), _gst_buffer_type, size);
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buffer->buffer.mini_object.copy =
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(GstMiniObjectCopyFunction) _gst_buffer_copy;
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buffer->buffer.mini_object.dispose =
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(GstMiniObjectDisposeFunction) _gst_buffer_dispose;
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buffer->buffer.mini_object.free =
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(GstMiniObjectFreeFunction) _gst_buffer_free;
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GST_BUFFER (buffer)->pool = NULL;
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GST_BUFFER_PTS (buffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_OFFSET (buffer) = GST_BUFFER_OFFSET_NONE;
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GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET_NONE;
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GST_BUFFER_MEM_LEN (buffer) = 0;
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GST_BUFFER_META (buffer) = NULL;
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}
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/**
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* gst_buffer_new:
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*
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* Creates a newly allocated buffer without any data.
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*
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* MT safe.
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*
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* Returns: (transfer full): the new #GstBuffer.
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*/
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GstBuffer *
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gst_buffer_new (void)
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{
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GstBufferImpl *newbuf;
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newbuf = g_slice_new (GstBufferImpl);
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GST_CAT_LOG (GST_CAT_BUFFER, "new %p", newbuf);
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gst_buffer_init (newbuf, sizeof (GstBufferImpl));
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return GST_BUFFER_CAST (newbuf);
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}
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/**
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* gst_buffer_new_allocate:
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* @allocator: (allow-none): the #GstAllocator to use, or NULL to use the
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* default allocator
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* @size: the size in bytes of the new buffer's data.
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* @align: the alignment of the buffer memory
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*
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* Tries to create a newly allocated buffer with data of the given size and
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* alignment from @allocator. If the requested amount of memory can't be
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* allocated, NULL will be returned. The allocated buffer memory is not cleared.
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*
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* When @allocator is NULL, the default memory allocator will be used.
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*
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* Allocator buffer memory will be aligned to multiples of (@align + 1) bytes.
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*
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* Note that when @size == 0, the buffer will not have memory associated with it.
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*
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* MT safe.
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*
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* Returns: (transfer full): a new #GstBuffer, or NULL if the memory couldn't
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* be allocated.
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*/
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GstBuffer *
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gst_buffer_new_allocate (const GstAllocator * allocator, gsize size,
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gsize align)
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{
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GstBuffer *newbuf;
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GstMemory *mem;
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#if 0
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guint8 *data;
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gsize asize;
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#endif
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|
#if 1
|
|
if (size > 0) {
|
|
mem = gst_allocator_alloc (allocator, size, align);
|
|
if (G_UNLIKELY (mem == NULL))
|
|
goto no_memory;
|
|
} else {
|
|
mem = NULL;
|
|
}
|
|
|
|
newbuf = gst_buffer_new ();
|
|
|
|
if (mem != NULL)
|
|
_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);
|
|
}
|
|
#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, data, asize);
|
|
|
|
/* 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));
|
|
#endif
|
|
|
|
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:
|
|
* @data: data to wrap
|
|
* @free_func: function to free @data
|
|
* @offset: offset in @data of valid data
|
|
* @size: size of valid data in @data starting at @offset
|
|
*
|
|
* Creates a new buffer that wraps the given @data. Valid data is set
|
|
* to start at @offset and up to @size. If no @free_func is provided,
|
|
* buffer memory is marked READONLY.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: (transfer full): a new #GstBuffer
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_new_wrapped_full (gpointer data, GFreeFunc free_func, gsize offset,
|
|
gsize size)
|
|
{
|
|
GstBuffer *newbuf;
|
|
|
|
newbuf = gst_buffer_new ();
|
|
gst_buffer_take_memory (newbuf, -1,
|
|
gst_memory_new_wrapped (free_func ? 0 : GST_MEMORY_FLAG_READONLY,
|
|
data, free_func, offset + size, offset, size));
|
|
|
|
return newbuf;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_new_wrapped:
|
|
* @data: 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 (data, g_free, 0, size);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_n_memory:
|
|
* @buffer: a #GstBuffer.
|
|
*
|
|
* Get the amount of memory blocks that this buffer has.
|
|
*
|
|
* Returns: (transfer full): the amount of memory block in this buffer.
|
|
*/
|
|
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_take_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.
|
|
*
|
|
* Add the memory block @mem to @buffer at @idx. This function takes ownership
|
|
* of @mem and thus doesn't increase its refcount.
|
|
*/
|
|
void
|
|
gst_buffer_take_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
|
|
{
|
|
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)));
|
|
|
|
_memory_add (buffer, idx, mem);
|
|
}
|
|
|
|
static GstMemory *
|
|
_get_memory (GstBuffer * buffer, guint idx, gboolean write)
|
|
{
|
|
GstMemory *mem;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, idx);
|
|
|
|
if (G_UNLIKELY (write && !GST_MEMORY_IS_WRITABLE (mem))) {
|
|
GstMemory *copy;
|
|
GST_CAT_LOG (GST_CAT_BUFFER,
|
|
"making writable copy of memory %p in buffer %p", mem, buffer);
|
|
/* replace with a writable copy */
|
|
copy = gst_memory_copy (mem, 0, -1);
|
|
GST_BUFFER_MEM_PTR (buffer, idx) = copy;
|
|
gst_memory_unref (mem);
|
|
mem = copy;
|
|
}
|
|
return mem;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_peek_memory:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @flags: #GstMapFlags
|
|
*
|
|
* Get the memory block in @buffer at @idx for memory access in @flags.
|
|
* This function does not return a refcount to the memory block. The memory
|
|
* block stays valid for as long as the caller has a valid reference to @buffer.
|
|
*
|
|
* @buffer should be writable when @flags contains #GST_MAP_WRITE. If the memory
|
|
* at @idx is not writable, a new writable copy will be installed in @buffer and
|
|
* returned.
|
|
*
|
|
* Returns: a #GstMemory at @idx.
|
|
*/
|
|
GstMemory *
|
|
gst_buffer_peek_memory (GstBuffer * buffer, guint idx, GstMapFlags flags)
|
|
{
|
|
GstMemory *mem;
|
|
gboolean write;
|
|
|
|
write = (flags & GST_MAP_WRITE) != 0;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
|
|
g_return_val_if_fail (idx < GST_BUFFER_MEM_LEN (buffer), NULL);
|
|
|
|
/* check if we can write when asked for write access */
|
|
if (G_UNLIKELY (write && !gst_buffer_is_writable (buffer)))
|
|
goto not_writable;
|
|
|
|
mem = _get_memory (buffer, idx, write);
|
|
|
|
return mem;
|
|
|
|
/* ERRORS */
|
|
not_writable:
|
|
{
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), NULL);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_remove_memory_range:
|
|
* @buffer: a #GstBuffer.
|
|
* @idx: an index
|
|
* @length: a length
|
|
*
|
|
* Remove @len 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, guint length)
|
|
{
|
|
guint len, i, end;
|
|
|
|
g_return_if_fail (GST_IS_BUFFER (buffer));
|
|
g_return_if_fail (gst_buffer_is_writable (buffer));
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
if (length == -1) {
|
|
g_return_if_fail (idx < len);
|
|
length = len - idx;
|
|
}
|
|
|
|
end = idx + length;
|
|
for (i = idx; i < end; i++)
|
|
gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
|
|
|
|
if (end != len) {
|
|
g_memmove (&GST_BUFFER_MEM_PTR (buffer, idx),
|
|
&GST_BUFFER_MEM_PTR (buffer, end), (len - end) * sizeof (gpointer));
|
|
}
|
|
GST_BUFFER_MEM_LEN (buffer) = len - length;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_sizes:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: a pointer to the offset
|
|
* @maxsize: a pointer to the maxsize
|
|
*
|
|
* Get the total size of all memory blocks in @buffer.
|
|
*
|
|
* 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 with
|
|
* gst_buffer_resize().
|
|
*
|
|
* Returns: the total size of the memory in @buffer.
|
|
*/
|
|
gsize
|
|
gst_buffer_get_sizes (GstBuffer * buffer, 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);
|
|
|
|
if (G_LIKELY (len == 1)) {
|
|
/* common case */
|
|
mem = GST_BUFFER_MEM_PTR (buffer, 0);
|
|
size = gst_memory_get_sizes (mem, offset, maxsize);
|
|
} else {
|
|
guint i;
|
|
gsize extra, offs;
|
|
|
|
size = offs = extra = 0;
|
|
for (i = 0; i < len; 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 adjustement
|
|
* @size: the new size or -1 to just adjust the offset
|
|
*
|
|
* Set the total size of the buffer
|
|
*/
|
|
void
|
|
gst_buffer_resize (GstBuffer * buffer, gssize offset, gssize size)
|
|
{
|
|
guint len;
|
|
guint i;
|
|
gsize bsize, bufsize, bufoffs, bufmax;
|
|
GstMemory *mem;
|
|
|
|
g_return_if_fail (gst_buffer_is_writable (buffer));
|
|
g_return_if_fail (size >= -1);
|
|
|
|
bufsize = gst_buffer_get_sizes (buffer, &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_if_fail ((offset < 0 && bufoffs >= -offset) || (offset >= 0
|
|
&& bufoffs + offset <= bufmax));
|
|
if (size == -1) {
|
|
g_return_if_fail (bufsize >= offset);
|
|
size = bufsize - offset;
|
|
}
|
|
g_return_if_fail (bufmax >= bufoffs + offset + size);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
|
|
/* copy and trim */
|
|
for (i = 0; i < len; i++) {
|
|
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 == len)
|
|
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) {
|
|
/* we need to clip something */
|
|
if (GST_MEMORY_IS_WRITABLE (mem)) {
|
|
gst_memory_resize (mem, offset, left);
|
|
} else {
|
|
GstMemory *tmp;
|
|
|
|
if (mem->flags & GST_MEMORY_FLAG_NO_SHARE)
|
|
tmp = gst_memory_copy (mem, offset, left);
|
|
else
|
|
tmp = gst_memory_share (mem, offset, left);
|
|
|
|
gst_memory_unref (mem);
|
|
mem = tmp;
|
|
}
|
|
}
|
|
offset = noffs;
|
|
size -= left;
|
|
|
|
GST_BUFFER_MEM_PTR (buffer, i) = mem;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_map:
|
|
* @buffer: a #GstBuffer.
|
|
* @size: (out) (allow-none): a location for the size
|
|
* @maxsize: (out) (allow-none): a location for the max size
|
|
* @flags: flags for the mapping
|
|
*
|
|
* This function return a pointer to the memory 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()).
|
|
*
|
|
* @size and @maxsize will contain the current valid number of bytes in the
|
|
* returned memory area and the total maximum mount of bytes available in the
|
|
* returned memory area respectively. Both parameters can be %NULL.
|
|
*
|
|
* 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.
|
|
*
|
|
* When the buffer contains multiple memory blocks, the returned pointer will be
|
|
* a concatenation of the memory blocks.
|
|
*
|
|
* Returns: (transfer none): a pointer to the memory for the buffer.
|
|
*/
|
|
gpointer
|
|
gst_buffer_map (GstBuffer * buffer, gsize * size, gsize * maxsize,
|
|
GstMapFlags flags)
|
|
{
|
|
guint len;
|
|
gpointer data;
|
|
GstMemory *mem;
|
|
gboolean write, writable;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
|
|
|
|
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;
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
|
|
if (G_UNLIKELY (len == 0)) {
|
|
/* no memory, return immediately */
|
|
if (size)
|
|
*size = 0;
|
|
if (maxsize)
|
|
*maxsize = 0;
|
|
return NULL;
|
|
}
|
|
|
|
if (G_LIKELY (len == 1)) {
|
|
/* we can take the first one */
|
|
mem = GST_BUFFER_MEM_PTR (buffer, 0);
|
|
} else {
|
|
/* we need to span memory */
|
|
if (writable) {
|
|
/* if we can write, we can change the memory with the spanned
|
|
* memory */
|
|
mem = _span_memory (buffer, 0, -1, write);
|
|
_replace_memory (buffer, mem);
|
|
} else {
|
|
gsize bsize;
|
|
|
|
/* extract all data in new memory, FIXME slow!! */
|
|
bsize = gst_buffer_get_size (buffer);
|
|
|
|
data = g_malloc (bsize);
|
|
gst_buffer_extract (buffer, 0, data, bsize);
|
|
if (size)
|
|
*size = bsize;
|
|
if (maxsize)
|
|
*maxsize = bsize;
|
|
return data;
|
|
}
|
|
}
|
|
|
|
if (G_UNLIKELY (write && !GST_MEMORY_IS_WRITABLE (mem))) {
|
|
GstMemory *copy;
|
|
/* replace with a writable copy */
|
|
copy = gst_memory_copy (mem, 0, -1);
|
|
GST_BUFFER_MEM_PTR (buffer, 0) = copy;
|
|
gst_memory_unref (mem);
|
|
mem = copy;
|
|
}
|
|
|
|
data = gst_memory_map (mem, size, maxsize, flags);
|
|
|
|
return data;
|
|
|
|
/* ERROR */
|
|
not_writable:
|
|
{
|
|
g_return_val_if_fail (gst_buffer_is_writable (buffer), NULL);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_unmap:
|
|
* @buffer: a #GstBuffer.
|
|
* @data: the previously mapped data
|
|
* @size: the size of @data, or -1
|
|
*
|
|
* Release the memory previously mapped with gst_buffer_map(). Pass -1 to size
|
|
* if no update is needed.
|
|
*
|
|
* Returns: #TRUE on success. #FALSE can be returned when the new size is larger
|
|
* than the maxsize of the memory.
|
|
*/
|
|
gboolean
|
|
gst_buffer_unmap (GstBuffer * buffer, gpointer data, gssize size)
|
|
{
|
|
gboolean result;
|
|
guint len;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
|
|
g_return_val_if_fail (size >= -1, FALSE);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
|
|
if (G_LIKELY (len == 1)) {
|
|
GstMemory *mem = GST_BUFFER_MEM_PTR (buffer, 0);
|
|
|
|
result = gst_memory_unmap (mem, data, size);
|
|
} else {
|
|
/* this must have been from read-only access. After _map, the buffer either
|
|
* only contains 1 memory block or it allocated memory to join memory
|
|
* blocks. It's not allowed to add buffers between _map and _unmap. */
|
|
g_free (data);
|
|
result = TRUE;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_fill:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset to fill
|
|
* @src: 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, 0);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
left = size;
|
|
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
guint8 *data;
|
|
gsize ssize, tocopy;
|
|
GstMemory *mem;
|
|
|
|
mem = _get_memory (buffer, i, TRUE);
|
|
|
|
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_WRITE);
|
|
if (ssize > offset) {
|
|
/* we have enough */
|
|
tocopy = MIN (ssize - offset, left);
|
|
memcpy (data + offset, ptr, tocopy);
|
|
left -= tocopy;
|
|
ptr += tocopy;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= ssize;
|
|
}
|
|
gst_memory_unmap (mem, data, ssize);
|
|
}
|
|
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);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
left = size;
|
|
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
guint8 *data;
|
|
gsize ssize, tocopy;
|
|
GstMemory *mem;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, i);
|
|
|
|
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_READ);
|
|
if (ssize > offset) {
|
|
/* we have enough */
|
|
tocopy = MIN (ssize - offset, left);
|
|
memcpy (ptr, data + offset, tocopy);
|
|
left -= tocopy;
|
|
ptr += tocopy;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= ssize;
|
|
}
|
|
gst_memory_unmap (mem, data, ssize);
|
|
}
|
|
return size - left;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_memcmp:
|
|
* @buffer: a #GstBuffer.
|
|
* @offset: the offset in @buffer
|
|
* @mem: 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);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
|
|
for (i = 0; i < len && size > 0 && res == 0; i++) {
|
|
guint8 *data;
|
|
gsize ssize, tocmp;
|
|
GstMemory *mem;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, i);
|
|
|
|
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_READ);
|
|
if (ssize > offset) {
|
|
/* we have enough */
|
|
tocmp = MIN (ssize - offset, size);
|
|
res = memcmp (ptr, data + offset, tocmp);
|
|
size -= tocmp;
|
|
ptr += tocmp;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= ssize;
|
|
}
|
|
gst_memory_unmap (mem, data, ssize);
|
|
}
|
|
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);
|
|
|
|
len = GST_BUFFER_MEM_LEN (buffer);
|
|
left = size;
|
|
|
|
for (i = 0; i < len && left > 0; i++) {
|
|
guint8 *data;
|
|
gsize ssize, toset;
|
|
GstMemory *mem;
|
|
|
|
mem = GST_BUFFER_MEM_PTR (buffer, i);
|
|
|
|
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_WRITE);
|
|
if (ssize > offset) {
|
|
/* we have enough */
|
|
toset = MIN (ssize - offset, left);
|
|
memset (data + offset, val, toset);
|
|
left -= toset;
|
|
offset = 0;
|
|
} else {
|
|
/* offset past buffer, skip */
|
|
offset -= ssize;
|
|
}
|
|
gst_memory_unmap (mem, data, ssize);
|
|
}
|
|
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.
|
|
*
|
|
* 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);
|
|
|
|
gst_buffer_copy_into (copy, buffer, flags, offset, size);
|
|
|
|
return copy;
|
|
}
|
|
|
|
static gboolean
|
|
_gst_buffer_arr_is_span_fast (GstMemory ** mem[], gsize len[], guint n,
|
|
gsize * offset, GstMemory ** parent)
|
|
{
|
|
GstMemory *mcur, *mprv;
|
|
gboolean have_offset = FALSE;
|
|
guint count, i;
|
|
|
|
mcur = mprv = NULL;
|
|
for (count = 0; count < n; count++) {
|
|
gsize offs, clen;
|
|
GstMemory **cmem;
|
|
|
|
cmem = mem[count];
|
|
clen = len[count];
|
|
|
|
for (i = 0; i < clen; i++) {
|
|
if (mcur)
|
|
mprv = mcur;
|
|
mcur = cmem[i];
|
|
|
|
if (mprv && mcur) {
|
|
/* check is memory is contiguous */
|
|
if (!gst_memory_is_span (mprv, mcur, &offs))
|
|
return FALSE;
|
|
|
|
if (!have_offset) {
|
|
if (offset)
|
|
*offset = offs;
|
|
if (parent)
|
|
*parent = mprv->parent;
|
|
|
|
have_offset = TRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return have_offset;
|
|
}
|
|
|
|
static GstMemory *
|
|
_gst_buffer_arr_span (GstMemory ** mem[], gsize len[], guint n, gsize offset,
|
|
gsize size, gboolean writable)
|
|
{
|
|
GstMemory *span, *parent = NULL;
|
|
gsize poffset = 0;
|
|
|
|
if (!writable
|
|
&& _gst_buffer_arr_is_span_fast (mem, len, n, &poffset, &parent)) {
|
|
if (parent->flags & GST_MEMORY_FLAG_NO_SHARE)
|
|
span = gst_memory_copy (parent, offset + poffset, size);
|
|
else
|
|
span = gst_memory_share (parent, offset + poffset, size);
|
|
} else {
|
|
gsize count, left;
|
|
guint8 *dest, *ptr;
|
|
|
|
span = gst_allocator_alloc (NULL, size, 0);
|
|
dest = gst_memory_map (span, NULL, NULL, GST_MAP_WRITE);
|
|
|
|
ptr = dest;
|
|
left = size;
|
|
|
|
for (count = 0; count < n; count++) {
|
|
gsize i, tocopy, clen, ssize;
|
|
guint8 *src;
|
|
GstMemory **cmem;
|
|
|
|
cmem = mem[count];
|
|
clen = len[count];
|
|
|
|
for (i = 0; i < clen && left > 0; i++) {
|
|
src = gst_memory_map (cmem[i], &ssize, NULL, GST_MAP_READ);
|
|
tocopy = MIN (ssize, left);
|
|
if (tocopy > offset) {
|
|
memcpy (ptr, src + offset, tocopy - offset);
|
|
left -= tocopy;
|
|
ptr += tocopy;
|
|
offset = 0;
|
|
} else {
|
|
offset -= tocopy;
|
|
}
|
|
gst_memory_unmap (cmem[i], src, ssize);
|
|
}
|
|
}
|
|
gst_memory_unmap (span, dest, size);
|
|
}
|
|
return span;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_is_span_fast:
|
|
* @buf1: the first #GstBuffer.
|
|
* @buf2: the second #GstBuffer.
|
|
*
|
|
* Determines whether a gst_buffer_span() can be done without copying
|
|
* the contents, that is, whether the data areas are contiguous sub-buffers of
|
|
* the same buffer.
|
|
*
|
|
* MT safe.
|
|
* Returns: TRUE if the buffers are contiguous,
|
|
* FALSE if a copy would be required.
|
|
*/
|
|
gboolean
|
|
gst_buffer_is_span_fast (GstBuffer * buf1, GstBuffer * buf2)
|
|
{
|
|
GstMemory **mem[2];
|
|
gsize len[2];
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buf1), FALSE);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buf2), FALSE);
|
|
g_return_val_if_fail (buf1->mini_object.refcount > 0, FALSE);
|
|
g_return_val_if_fail (buf2->mini_object.refcount > 0, FALSE);
|
|
|
|
mem[0] = GST_BUFFER_MEM_ARRAY (buf1);
|
|
len[0] = GST_BUFFER_MEM_LEN (buf1);
|
|
mem[1] = GST_BUFFER_MEM_ARRAY (buf2);
|
|
len[1] = GST_BUFFER_MEM_LEN (buf2);
|
|
|
|
return _gst_buffer_arr_is_span_fast (mem, len, 2, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_span:
|
|
* @buf1: the first source #GstBuffer to merge.
|
|
* @offset: the offset in the first buffer from where the new
|
|
* buffer should start.
|
|
* @buf2: the second source #GstBuffer to merge.
|
|
* @size: the total size of the new buffer.
|
|
*
|
|
* Creates a new buffer that consists of part of buf1 and buf2.
|
|
* Logically, buf1 and buf2 are concatenated into a single larger
|
|
* buffer, and a new buffer is created at the given offset inside
|
|
* this space, with a given length.
|
|
*
|
|
* If the two source buffers are children of the same larger buffer,
|
|
* and are contiguous, the new buffer will be a child of the shared
|
|
* parent, and thus no copying is necessary. you can use
|
|
* gst_buffer_is_span_fast() to determine if a memcpy will be needed.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: (transfer full): the new #GstBuffer that spans the two source
|
|
* buffers, or NULL if the arguments are invalid.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_span (GstBuffer * buf1, gsize offset, GstBuffer * buf2, gsize size)
|
|
{
|
|
GstBuffer *newbuf;
|
|
GstMemory *span;
|
|
GstMemory **mem[2];
|
|
gsize len[2], len1, len2;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buf1), NULL);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buf2), NULL);
|
|
g_return_val_if_fail (buf1->mini_object.refcount > 0, NULL);
|
|
g_return_val_if_fail (buf2->mini_object.refcount > 0, NULL);
|
|
len1 = gst_buffer_get_size (buf1);
|
|
len2 = gst_buffer_get_size (buf2);
|
|
g_return_val_if_fail (len1 + len2 > offset, NULL);
|
|
if (size == -1)
|
|
size = len1 + len2 - offset;
|
|
else
|
|
g_return_val_if_fail (size <= len1 + len2 - offset, NULL);
|
|
|
|
mem[0] = GST_BUFFER_MEM_ARRAY (buf1);
|
|
len[0] = GST_BUFFER_MEM_LEN (buf1);
|
|
mem[1] = GST_BUFFER_MEM_ARRAY (buf2);
|
|
len[1] = GST_BUFFER_MEM_LEN (buf2);
|
|
|
|
span = _gst_buffer_arr_span (mem, len, 2, offset, size, FALSE);
|
|
|
|
newbuf = gst_buffer_new ();
|
|
_memory_add (newbuf, -1, span);
|
|
|
|
#if 0
|
|
/* if the offset is 0, the new buffer has the same timestamp as buf1 */
|
|
if (offset == 0) {
|
|
GST_BUFFER_OFFSET (newbuf) = GST_BUFFER_OFFSET (buf1);
|
|
GST_BUFFER_PTS (newbuf) = GST_BUFFER_PTS (buf1);
|
|
GST_BUFFER_DTS (newbuf) = GST_BUFFER_DTS (buf1);
|
|
|
|
/* if we completely merged the two buffers (appended), we can
|
|
* calculate the duration too. Also make sure we's not messing with
|
|
* invalid DURATIONS */
|
|
if (buf1->size + buf2->size == len) {
|
|
if (GST_BUFFER_DURATION_IS_VALID (buf1) &&
|
|
GST_BUFFER_DURATION_IS_VALID (buf2)) {
|
|
/* add duration */
|
|
GST_BUFFER_DURATION (newbuf) = GST_BUFFER_DURATION (buf1) +
|
|
GST_BUFFER_DURATION (buf2);
|
|
}
|
|
if (GST_BUFFER_OFFSET_END_IS_VALID (buf2)) {
|
|
/* add offset_end */
|
|
GST_BUFFER_OFFSET_END (newbuf) = GST_BUFFER_OFFSET_END (buf2);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return newbuf;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_get_meta:
|
|
* @buffer: a #GstBuffer
|
|
* @info: a #GstMetaInfo
|
|
*
|
|
* Get the metadata for the api in @info on buffer. When there is no such
|
|
* metadata, NULL is returned.
|
|
*
|
|
* Note that the result metadata might not be of the implementation @info.
|
|
*
|
|
* Returns: the metadata for the api in @info on @buffer.
|
|
*/
|
|
GstMeta *
|
|
gst_buffer_get_meta (GstBuffer * buffer, const GstMetaInfo * info)
|
|
{
|
|
GstMetaItem *item;
|
|
GstMeta *result = NULL;
|
|
|
|
g_return_val_if_fail (buffer != NULL, NULL);
|
|
g_return_val_if_fail (info != NULL, 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 == info->api) {
|
|
result = meta;
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* 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): 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);
|
|
|
|
/* create a new slice */
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER, "alloc metadata %s of size %" G_GSIZE_FORMAT,
|
|
g_type_name (info->type), info->size);
|
|
|
|
size = ITEM_SIZE (info);
|
|
item = g_slice_alloc (size);
|
|
result = &item->meta;
|
|
result->info = info;
|
|
|
|
/* 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);
|
|
|
|
/* 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:
|
|
* @buffer: a #GstBuffer
|
|
* @state: 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 opage state pointer
|
|
*
|
|
* Returns: 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;
|
|
}
|