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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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <libavcodec/avcodec.h>
#include "common/av_common.h"
#include "common/common.h"
#include "packet.h"
static void packet_destroy(void *ptr)
{
struct demux_packet *dp = ptr;
talloc_free(dp->avpacket);
av_free(dp->allocation);
}
static struct demux_packet *create_packet(size_t len)
{
if (len > 1000000000) {
fprintf(stderr, "Attempt to allocate demux packet over 1 GB!\n");
abort();
}
struct demux_packet *dp = talloc(NULL, struct demux_packet);
talloc_set_destructor(dp, packet_destroy);
*dp = (struct demux_packet) {
.len = len,
.pts = MP_NOPTS_VALUE,
.dts = MP_NOPTS_VALUE,
.duration = -1,
.pos = -1,
.stream = -1,
};
return dp;
}
struct demux_packet *new_demux_packet(size_t len)
{
struct demux_packet *dp = create_packet(len);
dp->buffer = av_malloc(len + FF_INPUT_BUFFER_PADDING_SIZE);
if (!dp->buffer) {
fprintf(stderr, "Memory allocation failure!\n");
abort();
}
memset(dp->buffer + len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
dp->allocation = dp->buffer;
return dp;
}
// data must already have suitable padding, and does not copy the data
struct demux_packet *new_demux_packet_fromdata(void *data, size_t len)
{
struct demux_packet *dp = create_packet(len);
dp->buffer = data;
return dp;
}
struct demux_packet *new_demux_packet_from(void *data, size_t len)
{
struct demux_packet *dp = new_demux_packet(len);
memcpy(dp->buffer, data, len);
return dp;
}
void demux_packet_shorten(struct demux_packet *dp, size_t len)
{
assert(len <= dp->len);
dp->len = len;
memset(dp->buffer + dp->len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}
void free_demux_packet(struct demux_packet *dp)
{
talloc_free(dp);
}
static void destroy_avpacket(void *pkt)
{
av_free_packet(pkt);
}
struct demux_packet *demux_copy_packet(struct demux_packet *dp)
{
struct demux_packet *new = NULL;
if (dp->avpacket) {
assert(dp->buffer == dp->avpacket->data);
assert(dp->len == dp->avpacket->size);
AVPacket *newavp = talloc_zero(NULL, AVPacket);
talloc_set_destructor(newavp, destroy_avpacket);
av_init_packet(newavp);
if (av_packet_ref(newavp, dp->avpacket) < 0)
abort();
new = new_demux_packet_fromdata(newavp->data, newavp->size);
new->avpacket = newavp;
}
if (!new) {
new = new_demux_packet(dp->len);
memcpy(new->buffer, dp->buffer, new->len);
}
new->pts = dp->pts;
new->dts = dp->dts;
new->duration = dp->duration;
return new;
}
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