gstreamer/subprojects/gst-plugins-good/gst/rtp/gstbuffermemory.c

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/* 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;
}
}