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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.
116 lines
2.7 KiB
C
116 lines
2.7 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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#include "gstbuffermemory.h"
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gboolean
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gst_buffer_memory_map (GstBuffer * buffer, GstBufferMemoryMap * map)
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{
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GstMemory *mem;
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g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
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g_return_val_if_fail (map != NULL, FALSE);
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if (gst_buffer_n_memory (buffer) == 0) {
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GST_DEBUG ("no memory blocks in buffer");
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return FALSE;
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}
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mem = gst_buffer_get_memory (buffer, 0);
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if (!gst_memory_map (mem, &map->map, GST_MAP_READ)) {
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GST_ERROR ("failed to map memory");
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gst_memory_unref (mem);
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return FALSE;
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}
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map->buf = buffer;
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map->mem = mem;
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map->data = map->map.data;
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map->size = map->map.size;
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map->index = 0;
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return TRUE;
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}
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static gboolean
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buffer_memory_map_next (GstBufferMemoryMap * map)
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{
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if (!map->mem)
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return FALSE;
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gst_memory_unmap (map->mem, &map->map);
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gst_memory_unref (map->mem);
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map->mem = NULL;
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map->data = NULL;
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map->size = 0;
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map->index++;
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if (map->index >= gst_buffer_n_memory (map->buf)) {
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GST_DEBUG ("no more memory blocks in buffer");
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return FALSE;
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}
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map->mem = gst_buffer_get_memory (map->buf, map->index);
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if (!gst_memory_map (map->mem, &map->map, GST_MAP_READ)) {
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GST_ERROR ("failed to map memory");
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gst_memory_unref (map->mem);
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map->mem = NULL;
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return FALSE;
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}
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map->data = map->map.data;
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map->size = map->map.size;
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return TRUE;
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}
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gboolean
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gst_buffer_memory_advance_bytes (GstBufferMemoryMap * map, gsize size)
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{
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gsize offset = size;
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g_return_val_if_fail (map != NULL, FALSE);
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while (offset >= map->size) {
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offset -= map->size;
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GST_DEBUG ("switching memory");
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if (!buffer_memory_map_next (map))
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return FALSE;
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}
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map->data += offset;
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map->size -= offset;
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return TRUE;
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}
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void
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gst_buffer_memory_unmap (GstBufferMemoryMap * map)
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{
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g_return_if_fail (map != NULL);
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if (map->mem) {
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gst_memory_unmap (map->mem, &map->map);
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gst_memory_unref (map->mem);
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map->mem = NULL;
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}
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}
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