mirror of https://github.com/mpv-player/mpv
245 lines
7.2 KiB
C
245 lines
7.2 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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#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 <libavutil/intreadwrite.h>
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#include "common/av_common.h"
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#include "common/common.h"
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#include "demux.h"
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#include "packet.h"
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// Free any refcounted data dp holds (but don't free dp itself). This does not
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// care about pointers that are _not_ refcounted (like demux_packet.codec).
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// Normally, a user should use talloc_free(dp). This function is only for
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// annoyingly specific obscure use cases.
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void demux_packet_unref_contents(struct demux_packet *dp)
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{
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if (dp->avpacket) {
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assert(!dp->is_cached);
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av_packet_free(&dp->avpacket);
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dp->buffer = NULL;
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dp->len = 0;
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}
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}
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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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demux_packet_unref_contents(dp);
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}
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static struct demux_packet *packet_create(void)
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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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.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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.start = MP_NOPTS_VALUE,
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.end = MP_NOPTS_VALUE,
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.stream = -1,
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.avpacket = av_packet_alloc(),
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};
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MP_HANDLE_OOM(dp->avpacket);
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return dp;
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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 = packet_create();
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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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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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// (buf must include proper padding)
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struct demux_packet *new_demux_packet_from_buf(struct AVBufferRef *buf)
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{
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if (!buf)
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return NULL;
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if (buf->size > 1000000000)
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return NULL;
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struct demux_packet *dp = packet_create();
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dp->avpacket->buf = av_buffer_ref(buf);
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if (!dp->avpacket->buf) {
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talloc_free(dp);
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return NULL;
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}
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dp->avpacket->data = dp->buffer = buf->data;
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dp->avpacket->size = dp->len = buf->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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struct demux_packet *dp = new_demux_packet(len);
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if (!dp)
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return NULL;
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memcpy(dp->avpacket->data, data, len);
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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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if (len > INT_MAX)
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return NULL;
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struct demux_packet *dp = packet_create();
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int r = av_new_packet(dp->avpacket, len);
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if (r < 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 = 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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if (dp->len) {
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dp->len = len;
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memset(dp->buffer + dp->len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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}
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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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void demux_packet_copy_attribs(struct demux_packet *dst, struct demux_packet *src)
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{
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dst->pts = src->pts;
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dst->dts = src->dts;
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dst->duration = src->duration;
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dst->pos = src->pos;
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dst->segmented = src->segmented;
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dst->start = src->start;
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dst->end = src->end;
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dst->codec = src->codec;
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dst->back_restart = src->back_restart;
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dst->back_preroll = src->back_preroll;
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dst->keyframe = src->keyframe;
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dst->stream = src->stream;
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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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demux_packet_copy_attribs(new, dp);
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return new;
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}
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#define ROUND_ALLOC(s) MP_ALIGN_UP((s), 16)
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// Attempt to estimate the total memory consumption of the given packet.
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// This is important if we store thousands of packets and not to exceed
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// user-provided limits. Of course we can't know how much memory internal
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// fragmentation of the libc memory allocator will waste.
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// Note that this should return a "stable" value - e.g. if a new packet ref
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// is created, this should return the same value with the new ref. (This
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// implies the value is not exact and does not return the actual size of
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// memory wasted due to internal fragmentation.)
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size_t demux_packet_estimate_total_size(struct demux_packet *dp)
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{
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size_t size = ROUND_ALLOC(sizeof(struct demux_packet));
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size += 8 * sizeof(void *); // ta overhead
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size += 10 * sizeof(void *); // additional estimate for ta_ext_header
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if (dp->avpacket) {
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assert(!dp->is_cached);
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size += ROUND_ALLOC(dp->len);
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size += ROUND_ALLOC(sizeof(AVPacket));
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size += 8 * sizeof(void *); // ta overhead
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size += ROUND_ALLOC(sizeof(AVBufferRef));
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size += ROUND_ALLOC(64); // upper bound estimate on sizeof(AVBuffer)
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size += ROUND_ALLOC(dp->avpacket->side_data_elems *
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sizeof(dp->avpacket->side_data[0]));
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for (int n = 0; n < dp->avpacket->side_data_elems; n++)
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size += ROUND_ALLOC(dp->avpacket->side_data[n].size);
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}
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return size;
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}
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int demux_packet_set_padding(struct demux_packet *dp, int start, int end)
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{
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if (!start && !end)
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return 0;
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if (!dp->avpacket)
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return -1;
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uint8_t *p = av_packet_new_side_data(dp->avpacket, AV_PKT_DATA_SKIP_SAMPLES, 10);
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if (!p)
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return -1;
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AV_WL32(p + 0, start);
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AV_WL32(p + 4, end);
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return 0;
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}
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int demux_packet_add_blockadditional(struct demux_packet *dp, uint64_t id,
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void *data, size_t size)
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{
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if (!dp->avpacket)
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return -1;
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uint8_t *sd = av_packet_new_side_data(dp->avpacket,
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AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
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8 + size);
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if (!sd)
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return -1;
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AV_WB64(sd, id);
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if (size > 0)
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memcpy(sd + 8, data, size);
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return 0;
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}
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