mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-30 12:10:37 +00:00
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/* GStreamer
|
|
* Copyright (C) 2020 Ognyan Tonchev <ognyan at axis dot com>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "gstbuffermemory.h"
|
|
|
|
gboolean
|
|
gst_buffer_memory_map (GstBuffer * buffer, GstBufferMemoryMap * map)
|
|
{
|
|
GstMemory *mem;
|
|
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
|
|
g_return_val_if_fail (map != NULL, FALSE);
|
|
|
|
if (gst_buffer_n_memory (buffer) == 0) {
|
|
GST_DEBUG ("no memory blocks in buffer");
|
|
return FALSE;
|
|
}
|
|
|
|
mem = gst_buffer_get_memory (buffer, 0);
|
|
|
|
if (!gst_memory_map (mem, &map->map, GST_MAP_READ)) {
|
|
GST_ERROR ("failed to map memory");
|
|
gst_memory_unref (mem);
|
|
return FALSE;
|
|
}
|
|
|
|
map->buf = buffer;
|
|
map->mem = mem;
|
|
map->data = map->map.data;
|
|
map->size = map->map.size;
|
|
map->index = 0;
|
|
map->total_size = gst_buffer_get_size (buffer);
|
|
map->offset = 0;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
buffer_memory_map_next (GstBufferMemoryMap * map)
|
|
{
|
|
if (!map->mem)
|
|
return FALSE;
|
|
|
|
gst_memory_unmap (map->mem, &map->map);
|
|
gst_memory_unref (map->mem);
|
|
map->mem = NULL;
|
|
map->data = NULL;
|
|
map->size = 0;
|
|
|
|
map->index++;
|
|
|
|
if (map->index >= gst_buffer_n_memory (map->buf)) {
|
|
GST_DEBUG ("no more memory blocks in buffer");
|
|
return FALSE;
|
|
}
|
|
|
|
map->mem = gst_buffer_get_memory (map->buf, map->index);
|
|
|
|
if (!gst_memory_map (map->mem, &map->map, GST_MAP_READ)) {
|
|
GST_ERROR ("failed to map memory");
|
|
gst_memory_unref (map->mem);
|
|
map->mem = NULL;
|
|
return FALSE;
|
|
}
|
|
|
|
map->data = map->map.data;
|
|
map->size = map->map.size;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
gst_buffer_memory_advance_bytes (GstBufferMemoryMap * map, gsize size)
|
|
{
|
|
gsize offset = size;
|
|
|
|
g_return_val_if_fail (map != NULL, FALSE);
|
|
|
|
map->offset += size;
|
|
|
|
while (offset >= map->size) {
|
|
offset -= map->size;
|
|
GST_DEBUG ("switching memory");
|
|
if (!buffer_memory_map_next (map))
|
|
return FALSE;
|
|
}
|
|
|
|
map->data += offset;
|
|
map->size -= offset;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
gst_buffer_memory_unmap (GstBufferMemoryMap * map)
|
|
{
|
|
g_return_if_fail (map != NULL);
|
|
|
|
if (map->mem) {
|
|
gst_memory_unmap (map->mem, &map->map);
|
|
gst_memory_unref (map->mem);
|
|
map->mem = NULL;
|
|
}
|
|
}
|