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a78a74bff0
gst_buffer_map () results in memcopying when a GstBuffer contains more than one GstMemory and when AVC (length-prefixed) alignment is used. This has quite an impact on performance on systems with limited amount of resources. With this patch the whole GstBuffer will not be mapped at once, instead each individual GstMemory will be iterated and mapped separately.
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* GStreamer
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* Copyright (C) 2020 Ognyan Tonchev <ognyan at axis dot com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_BUFFER_MEMORY_H__
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#define __GST_BUFFER_MEMORY_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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struct _GstBufferMemoryMap
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{
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/* private datas */
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GstBuffer *buf;
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GstMemory *mem;
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GstMapInfo map;
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guint index;
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/* public datas */
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/* data of the currently mapped memory */
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const guint8 *data;
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/* size of the currently mapped memory */
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gsize size;
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/* When advancing through the data with gst_buffer_memory_advance_bytes ()
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* the data field is also advanced and the size field decreased with the
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* corresponding number of bytes. If all the bytes from the currently mapped
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* GstMemory have been consumed then a new GstMemory will be mapped and data
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* and size fileds will be updated.
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* */
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};
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typedef struct _GstBufferMemoryMap GstBufferMemoryMap;
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G_GNUC_INTERNAL
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gboolean gst_buffer_memory_map (GstBuffer * buffer, GstBufferMemoryMap * map);
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G_GNUC_INTERNAL
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gboolean gst_buffer_memory_advance_bytes (GstBufferMemoryMap * map, gsize size);
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G_GNUC_INTERNAL
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void gst_buffer_memory_unmap (GstBufferMemoryMap * map);
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G_END_DECLS
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#endif /* __GST_BUFFER_MEMORY_H__ */
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