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authorAnton Khirnov <anton@khirnov.net>2022-06-16 10:25:00 +0200
committerAnton Khirnov <anton@khirnov.net>2022-07-23 11:53:19 +0200
commit9ac78fb347e26270ebaf5ed41e55d34065853583 (patch)
treeca4f1709a4d4e80c5faba45faa3c5ea4ab2e36bf /fftools/objpool.c
parentd02ae31fb255a151ebf0546f1a349ccf951666a2 (diff)
downloadffmpeg-9ac78fb347e26270ebaf5ed41e55d34065853583.tar.gz
fftools: add an object pool
Allows to avoid constantly allocating and freeing objects like AVFrame or AVPacket.
Diffstat (limited to 'fftools/objpool.c')
-rw-r--r--fftools/objpool.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/fftools/objpool.c b/fftools/objpool.c
new file mode 100644
index 0000000000..b1561ecd69
--- /dev/null
+++ b/fftools/objpool.c
@@ -0,0 +1,131 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "libavcodec/packet.h"
+
+#include "libavutil/common.h"
+#include "libavutil/error.h"
+#include "libavutil/frame.h"
+#include "libavutil/mem.h"
+
+#include "objpool.h"
+
+struct ObjPool {
+ void *pool[32];
+ unsigned int pool_count;
+
+ ObjPoolCBAlloc alloc;
+ ObjPoolCBReset reset;
+ ObjPoolCBFree free;
+};
+
+ObjPool *objpool_alloc(ObjPoolCBAlloc cb_alloc, ObjPoolCBReset cb_reset,
+ ObjPoolCBFree cb_free)
+{
+ ObjPool *op = av_mallocz(sizeof(*op));
+
+ if (!op)
+ return NULL;
+
+ op->alloc = cb_alloc;
+ op->reset = cb_reset;
+ op->free = cb_free;
+
+ return op;
+}
+
+void objpool_free(ObjPool **pop)
+{
+ ObjPool *op = *pop;
+
+ if (!op)
+ return;
+
+ for (unsigned int i = 0; i < op->pool_count; i++)
+ op->free(&op->pool[i]);
+
+ av_freep(pop);
+}
+
+int objpool_get(ObjPool *op, void **obj)
+{
+ if (op->pool_count) {
+ *obj = op->pool[--op->pool_count];
+ op->pool[op->pool_count] = NULL;
+ } else
+ *obj = op->alloc();
+
+ return *obj ? 0 : AVERROR(ENOMEM);
+}
+
+void objpool_release(ObjPool *op, void **obj)
+{
+ if (!*obj)
+ return;
+
+ op->reset(*obj);
+
+ if (op->pool_count < FF_ARRAY_ELEMS(op->pool))
+ op->pool[op->pool_count++] = *obj;
+ else
+ op->free(obj);
+
+ *obj = NULL;
+}
+
+static void *alloc_packet(void)
+{
+ return av_packet_alloc();
+}
+static void *alloc_frame(void)
+{
+ return av_frame_alloc();
+}
+
+static void reset_packet(void *obj)
+{
+ return av_packet_unref(obj);
+}
+static void reset_frame(void *obj)
+{
+ return av_frame_unref(obj);
+}
+
+static void free_packet(void **obj)
+{
+ AVPacket *pkt = *obj;
+ av_packet_free(&pkt);
+ *obj = NULL;
+}
+static void free_frame(void **obj)
+{
+ AVFrame *frame = *obj;
+ av_frame_free(&frame);
+ *obj = NULL;
+}
+
+ObjPool *objpool_alloc_packets(void)
+{
+ return objpool_alloc(alloc_packet, reset_packet, free_packet);
+}
+ObjPool *objpool_alloc_frames(void)
+{
+ return objpool_alloc(alloc_frame, reset_frame, free_frame);
+}