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120 lines
2.8 KiB
C
120 lines
2.8 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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map->total_size = gst_buffer_get_size (buffer);
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map->offset = 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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map->offset += size;
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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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