mirror of
https://github.com/mpv-player/mpv
synced 2024-12-19 05:15:12 +00:00
123 lines
3.3 KiB
C
123 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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talloc_free(dp->avpacket);
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av_free(dp->allocation);
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}
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static struct demux_packet *create_packet(size_t len)
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{
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if (len > 1000000000) {
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fprintf(stderr, "Attempt to allocate demux packet over 1 GB!\n");
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abort();
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}
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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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.len = len,
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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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};
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return dp;
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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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struct demux_packet *dp = create_packet(len);
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dp->buffer = av_malloc(len + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!dp->buffer) {
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fprintf(stderr, "Memory allocation failure!\n");
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abort();
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}
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memset(dp->buffer + len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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dp->allocation = dp->buffer;
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return dp;
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}
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// data must already have suitable padding, and does not copy the data
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struct demux_packet *new_demux_packet_fromdata(void *data, size_t len)
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{
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struct demux_packet *dp = create_packet(len);
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dp->buffer = data;
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return dp;
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}
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struct demux_packet *new_demux_packet_from(void *data, size_t len)
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{
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struct demux_packet *dp = new_demux_packet(len);
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memcpy(dp->buffer, data, len);
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return dp;
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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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static void destroy_avpacket(void *pkt)
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{
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av_free_packet(pkt);
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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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assert(dp->buffer == dp->avpacket->data);
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assert(dp->len == dp->avpacket->size);
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AVPacket *newavp = talloc_zero(NULL, AVPacket);
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talloc_set_destructor(newavp, destroy_avpacket);
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av_init_packet(newavp);
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if (av_packet_ref(newavp, dp->avpacket) < 0)
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abort();
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new = new_demux_packet_fromdata(newavp->data, newavp->size);
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new->avpacket = newavp;
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}
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if (!new) {
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new = new_demux_packet(dp->len);
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memcpy(new->buffer, dp->buffer, new->len);
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}
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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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