mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 19:35:49 +00:00
116 lines
3.3 KiB
C
116 lines
3.3 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <libavcodec/avcodec.h>
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#include "common/av_common.h"
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#include "common/common.h"
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#include "packet.h"
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static void packet_destroy(void *ptr)
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{
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struct demux_packet *dp = ptr;
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av_packet_unref(dp->avpacket);
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}
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// This actually preserves only data and side data, not PTS/DTS/pos/etc.
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// It also allows avpkt->data==NULL with avpkt->size!=0 - the libavcodec API
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// does not allow it, but we do it to simplify new_demux_packet().
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struct demux_packet *new_demux_packet_from_avpacket(struct AVPacket *avpkt)
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{
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if (avpkt->size > 1000000000)
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return NULL;
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struct demux_packet *dp = talloc(NULL, struct demux_packet);
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talloc_set_destructor(dp, packet_destroy);
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*dp = (struct demux_packet) {
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.pts = MP_NOPTS_VALUE,
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.dts = MP_NOPTS_VALUE,
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.duration = -1,
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.pos = -1,
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.stream = -1,
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.avpacket = talloc_zero(dp, AVPacket),
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};
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av_init_packet(dp->avpacket);
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int r = -1;
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if (avpkt->data) {
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// We hope that this function won't need/access AVPacket input padding,
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// because otherwise new_demux_packet_from() wouldn't work.
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r = av_packet_ref(dp->avpacket, avpkt);
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} else {
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r = av_new_packet(dp->avpacket, avpkt->size);
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}
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if (r < 0) {
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*dp->avpacket = (AVPacket){0};
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talloc_free(dp);
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return NULL;
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}
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dp->buffer = dp->avpacket->data;
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dp->len = dp->avpacket->size;
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return dp;
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}
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// Input data doesn't need to be padded.
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struct demux_packet *new_demux_packet_from(void *data, size_t len)
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{
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if (len > INT_MAX)
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return NULL;
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AVPacket pkt = { .data = data, .size = len };
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return new_demux_packet_from_avpacket(&pkt);
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}
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struct demux_packet *new_demux_packet(size_t len)
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{
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if (len > INT_MAX)
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return NULL;
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AVPacket pkt = { .data = NULL, .size = len };
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return new_demux_packet_from_avpacket(&pkt);
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}
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void demux_packet_shorten(struct demux_packet *dp, size_t len)
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{
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assert(len <= dp->len);
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dp->len = len;
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memset(dp->buffer + dp->len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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}
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void free_demux_packet(struct demux_packet *dp)
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{
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talloc_free(dp);
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}
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struct demux_packet *demux_copy_packet(struct demux_packet *dp)
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{
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struct demux_packet *new = NULL;
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if (dp->avpacket) {
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new = new_demux_packet_from_avpacket(dp->avpacket);
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} else {
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// Some packets might be not created by new_demux_packet*().
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new = new_demux_packet_from(dp->buffer, dp->len);
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}
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if (!new)
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return NULL;
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new->pts = dp->pts;
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new->dts = dp->dts;
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new->duration = dp->duration;
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return new;
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}
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