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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "packet_pool.h"
#include <libavcodec/packet.h>
#include "config.h"
#include "common/global.h"
#include "osdep/threads.h"
#include "packet.h"
struct demux_packet_pool {
mp_mutex lock;
struct demux_packet *packets;
};
static void uninit(void *p)
{
struct demux_packet_pool *pool = p;
demux_packet_pool_clear(pool);
mp_mutex_destroy(&pool->lock);
}
static void free_demux_packets(struct demux_packet *dp)
{
while (dp) {
struct demux_packet *next = dp->next;
free_demux_packet(dp);
dp = next;
}
}
void demux_packet_pool_init(struct mpv_global *global)
{
struct demux_packet_pool *pool = talloc(global, struct demux_packet_pool);
talloc_set_destructor(pool, uninit);
mp_mutex_init(&pool->lock);
pool->packets = NULL;
mp_assert(!global->packet_pool);
global->packet_pool = pool;
}
struct demux_packet_pool *demux_packet_pool_get(struct mpv_global *global)
{
// Currently all clients use the same packet pool. There is no additional
// state for each client, may be extended in the future.
return global->packet_pool;
}
void demux_packet_pool_clear(struct demux_packet_pool *pool)
{
mp_mutex_lock(&pool->lock);
struct demux_packet *dp = pool->packets;
pool->packets = NULL;
mp_mutex_unlock(&pool->lock);
free_demux_packets(dp);
}
void demux_packet_pool_push(struct demux_packet_pool *pool,
struct demux_packet *dp)
{
if (!dp)
return;
dp->next = NULL;
demux_packet_pool_prepend(pool, dp, dp);
}
void demux_packet_pool_prepend(struct demux_packet_pool *pool,
struct demux_packet *head, struct demux_packet *tail)
{
if (!head)
return;
mp_assert(tail);
mp_assert(head != tail ? !!head->next : !head->next);
mp_mutex_lock(&pool->lock);
tail->next = pool->packets;
pool->packets = head;
#if HAVE_DISABLE_PACKET_POOL
struct demux_packet *dp = pool->packets;
pool->packets = NULL;
#endif
mp_mutex_unlock(&pool->lock);
#if HAVE_DISABLE_PACKET_POOL
free_demux_packets(dp);
#endif
}
struct demux_packet *demux_packet_pool_pop(struct demux_packet_pool *pool)
{
mp_mutex_lock(&pool->lock);
struct demux_packet *dp = pool->packets;
if (dp) {
pool->packets = dp->next;
dp->next = NULL;
}
mp_mutex_unlock(&pool->lock);
// Clear the packet from possible external references. This is done in the
// pop function instead of prepend to distribute the load of clearing packets.
// packet_create() is called at a reasonable rate, so it's fine to clear
// a single packet at a time. This avoids the need to clear potentially
// hundreds of thousands of packets at once when file playback is stopped,
// which would require a significant amount of time to iterate over all packets.
if (dp) {
if (dp->avpacket)
av_packet_unref(dp->avpacket);
ta_free_children(dp);
}
return dp;
}
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