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https://github.com/mpv-player/mpv
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038d66549d
This update introduces a demux_packet_pool, allowing for the reuse of previously allocated packets when needed. sizeof(AVPacket) is not a part of the lavc public ABI, which prevents us to allocate memory in larger blocks. However, we can substantially decrease the amount of alloc/free operations during playback by reusing both mpv's demux_packet and AVPacket. This adjustment addresses the root cause of issue #12076, which, although resolved upstream, did not fully tackle the persistent problem of allocating small blocks of aligned memory. This issue largely stems from the FFmpeg design of the AVPacket API. After this change memory will no longer be allocated once cache limits is reached. The demux_packet_pool is shared as a global pool of packets for a given MPContext. This change significantly speeds up the demuxer deinitialization, benefiting file switching scenarios, especially when a large demuxer cache is used. See: #12294 See: #12563 Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv 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
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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struct demux_packet_pool;
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struct demux_packet;
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struct mpv_global;
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/**
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* Initializes the demux packet pool.
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*
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* This function creates a new shaderd demux packet pool. Should be done only
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* once per mpv context.
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*
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* @param global Pointer to the global context.
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*/
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void demux_packet_pool_init(struct mpv_global *global);
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/**
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* Returns the demux packet pool context for client use.
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*
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* @param global Pointer to the global context.
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* @return Pointer to the demux packet context.
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*/
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struct demux_packet_pool *demux_packet_pool_get(struct mpv_global *global);
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/**
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* Clears the demux packet pool.
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*
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* This function frees all the packets in the pool.
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* This function is thread-safe.
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*
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* @param pool Pointer to the demux packet pool.
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*/
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void demux_packet_pool_clear(struct demux_packet_pool *pool);
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/**
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* Pushes a packet into the demux packet pool.
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*
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* This function pushes a new demux packet to the pool by appending
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* it to the list. If the packet is NULL, the function returns immediately.
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* This function is thread-safe.
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*
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* @param pool Pointer to the demux packet pool.
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* @param dp Pointer to the demux packet to be added.
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*/
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void demux_packet_pool_push(struct demux_packet_pool *pool,
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struct demux_packet *dp);
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/**
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* Prepends a linked list of demux packets to the pool.
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*
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* This function prepends a list of demux packets to the packet pool.
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* The head is the first packet to be inserted, and the tail is the
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* last one. This function is thread-safe.
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*
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* @param pool Pointer to the demux packet pool.
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* @param head Pointer to the head of the list of packets to be added.
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* @param tail Pointer to the tail of the list of packets to be added.
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*/
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void demux_packet_pool_prepend(struct demux_packet_pool *pool,
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struct demux_packet *head, struct demux_packet *tail);
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/**
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* Pops a packet from the demux packet pool.
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*
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* This function removes and returns the first packet from the pool's
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* linked list. This function is thread-safe.
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*
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* @param pool Pointer to the demux packet pool.
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* @return Pointer to the demux packet, or NULL if the pool is empty.
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*/
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struct demux_packet *demux_packet_pool_pop(struct demux_packet_pool *pool);
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