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566 lines
17 KiB
C
566 lines
17 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
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*
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* Buffers are the basic unit of data transfer in GStreamer. The GstBuffer type
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* provides all the state necessary to define a region of memory as part of a
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* stream. Sub-buffers are also supported, allowing a smaller region of a
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* buffer to become its own buffer, with mechanisms in place to ensure that
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* neither memory space goes away.
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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 set the size of the
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* buffer data. The following example creates a buffer that can hold a given
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* video frame 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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* gint size, width, height, bpp;
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*
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* ...
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*
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* size = width * height * bpp;
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*
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* buffer = gst_buffer_new ();
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* GST_BUFFER_SIZE (buffer) = size;
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* GST_BUFFER_MALLOCDATA (buffer) = g_alloc (size);
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* GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
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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_and_alloc()
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* to create a buffer with preallocated data of a given size.
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*
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* If an element knows what pad you will push the buffer out on, it should use
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* gst_pad_alloc_buffer() instead to create a buffer. This allows downstream
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* elements to provide special buffers to write in, like hardware buffers.
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*
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* A buffer has a pointer to a #GstCaps describing the media type of the data
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* in the buffer. Attach caps to the buffer with gst_buffer_set_caps(); this
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* is typically done before pushing out a buffer using gst_pad_push() so that
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* the downstream element knows the type of the buffer.
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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_create_sub().
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*
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* If the plug-in wants to modify the buffer in-place, it should first obtain
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* a buffer that is safe to modify by using gst_buffer_make_writable(). This
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* function is optimized so that a copy will 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 GST_BUFFER_FLAG_SET()
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* and GST_BUFFER_FLAG_UNSET() macros. Use GST_BUFFER_FLAG_IS_SET() to test it
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* a certain #GstBufferFlag is set.
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*
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* Buffers can be efficiently merged into a larger buffer with gst_buffer_merge()
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* and gst_buffer_span() if the gst_buffer_is_span_fast() 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 usually are freed by unreffing them with gst_buffer_unref(). When
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* the refcount drops to 0, the buffer memory will be freed again.
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*
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* Last reviewed on September 24th, 2005 (0.9.0)
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*/
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#include "gst_private.h"
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#include "gstbuffer.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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static void gst_buffer_init (GTypeInstance * instance, gpointer g_class);
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static void gst_buffer_class_init (gpointer g_class, gpointer class_data);
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static void gst_buffer_finalize (GstBuffer * buffer);
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static GstBuffer *_gst_buffer_copy (GstBuffer * buffer);
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void
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_gst_buffer_initialize (void)
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{
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gpointer ptr;
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gst_buffer_get_type ();
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/* the GstMiniObject types need to be class_ref'd once before it can be
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* done from multiple threads;
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* see http://bugzilla.gnome.org/show_bug.cgi?id=304551 */
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ptr = g_type_class_ref (GST_TYPE_BUFFER);
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g_type_class_unref (ptr);
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}
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GType
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gst_buffer_get_type (void)
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{
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static GType _gst_buffer_type;
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if (G_UNLIKELY (_gst_buffer_type == 0)) {
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static const GTypeInfo buffer_info = {
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sizeof (GstBufferClass),
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NULL,
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NULL,
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gst_buffer_class_init,
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NULL,
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NULL,
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sizeof (GstBuffer),
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0,
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gst_buffer_init,
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NULL
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};
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_gst_buffer_type = g_type_register_static (GST_TYPE_MINI_OBJECT,
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"GstBuffer", &buffer_info, 0);
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}
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return _gst_buffer_type;
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}
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static void
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gst_buffer_class_init (gpointer g_class, gpointer class_data)
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{
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GstBufferClass *buffer_class = GST_BUFFER_CLASS (g_class);
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buffer_class->mini_object_class.copy =
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(GstMiniObjectCopyFunction) _gst_buffer_copy;
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buffer_class->mini_object_class.finalize =
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(GstMiniObjectFinalizeFunction) gst_buffer_finalize;
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}
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static void
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gst_buffer_finalize (GstBuffer * buffer)
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{
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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 our data */
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if (buffer->malloc_data) {
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g_free (buffer->malloc_data);
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}
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gst_caps_replace (&GST_BUFFER_CAPS (buffer), NULL);
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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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guint mask;
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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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GST_CAT_LOG (GST_CAT_BUFFER, "copy %p to %p", buffer, copy);
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/* copy relevant flags */
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mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
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GST_BUFFER_FLAG_DELTA_UNIT;
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GST_MINI_OBJECT (copy)->flags |= GST_MINI_OBJECT (buffer)->flags & mask;
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/* we simply copy everything from our parent */
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copy->data = g_memdup (buffer->data, buffer->size);
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/* make sure it gets freed (even if the parent is subclassed, we return a
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normal buffer */
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copy->malloc_data = copy->data;
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copy->size = buffer->size;
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GST_BUFFER_TIMESTAMP (copy) = GST_BUFFER_TIMESTAMP (buffer);
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GST_BUFFER_DURATION (copy) = GST_BUFFER_DURATION (buffer);
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GST_BUFFER_OFFSET (copy) = GST_BUFFER_OFFSET (buffer);
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GST_BUFFER_OFFSET_END (copy) = GST_BUFFER_OFFSET_END (buffer);
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if (GST_BUFFER_CAPS (buffer))
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GST_BUFFER_CAPS (copy) = gst_caps_ref (GST_BUFFER_CAPS (buffer));
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else
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GST_BUFFER_CAPS (copy) = NULL;
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return copy;
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}
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static void
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gst_buffer_init (GTypeInstance * instance, gpointer g_class)
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{
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GstBuffer *buffer;
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buffer = (GstBuffer *) instance;
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GST_CAT_LOG (GST_CAT_BUFFER, "init %p", buffer);
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GST_BUFFER_TIMESTAMP (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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}
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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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* Returns: the new #GstBuffer.
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*
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* MT safe.
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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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GstBuffer *newbuf;
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newbuf = (GstBuffer *) gst_mini_object_new (GST_TYPE_BUFFER);
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GST_CAT_LOG (GST_CAT_BUFFER, "new %p", newbuf);
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return newbuf;
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}
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/**
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* gst_buffer_new_and_alloc:
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* @size: the size of the new buffer's data.
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*
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* Creates a newly allocated buffer with data of the given size.
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*
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* Returns: the new #GstBuffer.
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*
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* MT safe.
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*/
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GstBuffer *
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gst_buffer_new_and_alloc (guint size)
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{
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GstBuffer *newbuf;
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newbuf = gst_buffer_new ();
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newbuf->malloc_data = g_malloc (size);
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GST_BUFFER_DATA (newbuf) = newbuf->malloc_data;
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GST_BUFFER_SIZE (newbuf) = size;
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GST_CAT_LOG (GST_CAT_BUFFER, "new %p of size %d", newbuf, size);
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return newbuf;
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}
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/**
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* gst_buffer_get_caps:
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* @buffer: a #GstBuffer to get the caps of.
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*
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* Gets the media type of the buffer. This can be NULL if there
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* is not media type attached to this buffer or when the media
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* type is the same as the previous received buffer.
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*
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* Returns: a reference to the #GstCaps, or NULL if there were no caps on this
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* buffer.
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*/
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/* FIXME can we make this threadsafe without a lock on the buffer?
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* We can use compare and swap and atomic reads. */
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GstCaps *
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gst_buffer_get_caps (GstBuffer * buffer)
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{
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GstCaps *ret;
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g_return_val_if_fail (buffer != NULL, NULL);
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ret = GST_BUFFER_CAPS (buffer);
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if (ret)
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gst_caps_ref (ret);
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return ret;
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}
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/**
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* gst_buffer_set_caps:
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* @buffer: a #GstBuffer to set the caps of.
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* @caps: a #GstCaps to set.
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*
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* Sets the media type on the buffer. The caps' refcount will
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* be increased and any previous caps on the buffer will be
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* unreffed.
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*/
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/* FIXME can we make this threadsafe without a lock on the buffer?
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* We can use compare and swap and atomic reads. Another idea is to
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* not attach the caps to the buffer but use an event to signal a caps
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* change. */
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void
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gst_buffer_set_caps (GstBuffer * buffer, GstCaps * caps)
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{
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g_return_if_fail (buffer != NULL);
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gst_caps_replace (&GST_BUFFER_CAPS (buffer), caps);
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}
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typedef struct _GstSubBuffer GstSubBuffer;
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typedef struct _GstSubBufferClass GstSubBufferClass;
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#define GST_TYPE_SUBBUFFER (gst_subbuffer_get_type())
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#define GST_IS_SUBBUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SUBBUFFER))
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#define GST_SUBBUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SUBBUFFER, GstSubBuffer))
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struct _GstSubBuffer
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{
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GstBuffer buffer;
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GstBuffer *parent;
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};
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struct _GstSubBufferClass
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{
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GstBufferClass buffer_class;
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};
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static GstBufferClass *sub_parent_class;
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static void gst_subbuffer_init (GTypeInstance * instance, gpointer g_class);
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static void gst_subbuffer_class_init (gpointer g_class, gpointer class_data);
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static void gst_subbuffer_finalize (GstSubBuffer * buffer);
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static GType
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gst_subbuffer_get_type (void)
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{
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static GType _gst_subbuffer_type = 0;
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if (G_UNLIKELY (_gst_subbuffer_type == 0)) {
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static const GTypeInfo subbuffer_info = {
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sizeof (GstSubBufferClass),
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NULL,
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NULL,
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gst_subbuffer_class_init,
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NULL,
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NULL,
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sizeof (GstSubBuffer),
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0,
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gst_subbuffer_init,
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NULL
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};
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_gst_subbuffer_type = g_type_register_static (GST_TYPE_BUFFER,
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"GstSubBuffer", &subbuffer_info, 0);
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}
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return _gst_subbuffer_type;
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}
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static void
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gst_subbuffer_class_init (gpointer g_class, gpointer class_data)
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{
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GstBufferClass *buffer_class = GST_BUFFER_CLASS (g_class);
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sub_parent_class = g_type_class_ref (GST_TYPE_BUFFER);
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buffer_class->mini_object_class.finalize =
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(GstMiniObjectFinalizeFunction) gst_subbuffer_finalize;
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}
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static void
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gst_subbuffer_finalize (GstSubBuffer * buffer)
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{
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gst_buffer_unref (buffer->parent);
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GST_MINI_OBJECT_CLASS (sub_parent_class)->finalize (GST_MINI_OBJECT (buffer));
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}
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static void
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gst_subbuffer_init (GTypeInstance * instance, gpointer g_class)
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{
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GST_BUFFER_FLAG_SET (GST_BUFFER_CAST (instance), GST_BUFFER_FLAG_READONLY);
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}
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/**
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* gst_buffer_create_sub:
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* @parent: a parent #GstBuffer to create a subbuffer from.
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* @offset: the offset into parent #GstBuffer.
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* @size: the size of the new #GstBuffer sub-buffer (with size > 0).
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*
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* Creates a sub-buffer from the parent at a given offset.
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* This sub-buffer uses the actual memory space of the parent buffer.
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* This function will copy the offset and timestamp field when the
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* offset is 0, else they are set to _NONE.
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* The duration field of the new buffer are set to GST_CLOCK_TIME_NONE.
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*
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* Returns: the new #GstBuffer, or NULL if there was an error.
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*
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* MT safe.
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*/
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GstBuffer *
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gst_buffer_create_sub (GstBuffer * buffer, guint offset, guint size)
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{
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GstSubBuffer *subbuffer;
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GstBuffer *parent;
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g_return_val_if_fail (buffer != NULL, NULL);
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g_return_val_if_fail (buffer->mini_object.refcount > 0, NULL);
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g_return_val_if_fail (size > 0, NULL);
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g_return_val_if_fail (buffer->size >= offset + size, NULL);
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/* find real parent */
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if (GST_IS_SUBBUFFER (buffer)) {
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parent = GST_SUBBUFFER (buffer)->parent;
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} else {
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parent = buffer;
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}
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gst_buffer_ref (parent);
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/* create the new buffer */
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subbuffer = (GstSubBuffer *) gst_mini_object_new (GST_TYPE_SUBBUFFER);
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subbuffer->parent = parent;
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GST_CAT_LOG (GST_CAT_BUFFER, "new subbuffer %p (parent %p)", subbuffer,
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parent);
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/* set the right values in the child */
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GST_BUFFER_DATA (GST_BUFFER_CAST (subbuffer)) = buffer->data + offset;
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GST_BUFFER_SIZE (GST_BUFFER_CAST (subbuffer)) = size;
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/* we can copy the timestamp and offset if the new buffer starts at
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* offset 0 */
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if (offset == 0) {
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GST_BUFFER_TIMESTAMP (subbuffer) = GST_BUFFER_TIMESTAMP (buffer);
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GST_BUFFER_OFFSET (subbuffer) = GST_BUFFER_OFFSET (buffer);
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} else {
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GST_BUFFER_TIMESTAMP (subbuffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_OFFSET (subbuffer) = GST_BUFFER_OFFSET_NONE;
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}
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GST_BUFFER_DURATION (subbuffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_OFFSET_END (subbuffer) = GST_BUFFER_OFFSET_NONE;
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GST_BUFFER_CAPS (subbuffer) = NULL;
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return GST_BUFFER_CAST (subbuffer);
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}
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/**
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* gst_buffer_is_span_fast:
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* @buf1: a first source #GstBuffer.
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* @buf2: the second source #GstBuffer.
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*
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* Determines whether a gst_buffer_span() can be done without copying
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* the contents, that is, whether the data areas are contiguous.
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*
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* Returns: TRUE if the buffers are contiguous,
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* FALSE if a copy would be required.
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*
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* MT safe.
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*/
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gboolean
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gst_buffer_is_span_fast (GstBuffer * buf1, GstBuffer * buf2)
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{
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g_return_val_if_fail (buf1 != NULL && buf2 != NULL, FALSE);
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g_return_val_if_fail (buf1->mini_object.refcount > 0, FALSE);
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g_return_val_if_fail (buf2->mini_object.refcount > 0, FALSE);
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/* it's only fast if we have subbuffers of the same parent */
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return (GST_IS_SUBBUFFER (buf1) &&
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GST_IS_SUBBUFFER (buf2) &&
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(GST_SUBBUFFER (buf1)->parent == GST_SUBBUFFER (buf2)->parent) &&
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((buf1->data + buf1->size) == buf2->data));
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}
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/**
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* gst_buffer_span:
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* @buf1: a first source #GstBuffer to merge.
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* @offset: the offset in the first buffer from where the new
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* buffer should start.
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* @buf2: the second source #GstBuffer to merge.
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* @len: the total length of the new buffer.
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*
|
|
* 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.
|
|
*
|
|
* Returns: the new #GstBuffer that spans the two source buffers.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_span (GstBuffer * buf1, guint32 offset, GstBuffer * buf2,
|
|
guint32 len)
|
|
{
|
|
GstBuffer *newbuf;
|
|
|
|
g_return_val_if_fail (buf1 != NULL && buf2 != NULL, NULL);
|
|
g_return_val_if_fail (buf1->mini_object.refcount > 0, FALSE);
|
|
g_return_val_if_fail (buf2->mini_object.refcount > 0, FALSE);
|
|
g_return_val_if_fail (len > 0, NULL);
|
|
g_return_val_if_fail (len <= buf1->size + buf2->size - offset, NULL);
|
|
|
|
/* if the two buffers have the same parent and are adjacent */
|
|
if (gst_buffer_is_span_fast (buf1, buf2)) {
|
|
GstBuffer *parent = GST_SUBBUFFER (buf1)->parent;
|
|
|
|
/* we simply create a subbuffer of the common parent */
|
|
newbuf = gst_buffer_create_sub (parent,
|
|
buf1->data - parent->data + offset, len);
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_BUFFER,
|
|
"slow path taken while spanning buffers %p and %p", buf1, buf2);
|
|
/* otherwise we simply have to brute-force copy the buffers */
|
|
newbuf = gst_buffer_new_and_alloc (len);
|
|
|
|
/* copy the first buffer's data across */
|
|
memcpy (newbuf->data, buf1->data + offset, buf1->size - offset);
|
|
/* copy the second buffer's data across */
|
|
memcpy (newbuf->data + (buf1->size - offset), buf2->data,
|
|
len - (buf1->size - offset));
|
|
/* 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_TIMESTAMP (newbuf) = GST_BUFFER_TIMESTAMP (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 (offset == 0 && 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);
|
|
}
|
|
}
|
|
|
|
return newbuf;
|
|
}
|