1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 <libavutil/intreadwrite.h>
#include "config.h"
#include "common/av_common.h"
#include "common/common.h"
#include "packet.h"
static void packet_destroy(void *ptr)
{
struct demux_packet *dp = ptr;
av_packet_unref(dp->avpacket);
}
// This actually preserves only data and side data, not PTS/DTS/pos/etc.
// It also allows avpkt->data==NULL with avpkt->size!=0 - the libavcodec API
// does not allow it, but we do it to simplify new_demux_packet().
struct demux_packet *new_demux_packet_from_avpacket(struct AVPacket *avpkt)
{
if (avpkt->size > 1000000000)
return NULL;
struct demux_packet *dp = talloc(NULL, struct demux_packet);
talloc_set_destructor(dp, packet_destroy);
*dp = (struct demux_packet) {
.pts = MP_NOPTS_VALUE,
.dts = MP_NOPTS_VALUE,
.duration = -1,
.pos = -1,
.start = MP_NOPTS_VALUE,
.end = MP_NOPTS_VALUE,
.stream = -1,
.avpacket = talloc_zero(dp, AVPacket),
.kf_seek_pts = MP_NOPTS_VALUE,
};
av_init_packet(dp->avpacket);
int r = -1;
if (avpkt->data) {
// We hope that this function won't need/access AVPacket input padding,
// because otherwise new_demux_packet_from() wouldn't work.
r = av_packet_ref(dp->avpacket, avpkt);
} else {
r = av_new_packet(dp->avpacket, avpkt->size);
}
if (r < 0) {
*dp->avpacket = (AVPacket){0};
talloc_free(dp);
return NULL;
}
dp->buffer = dp->avpacket->data;
dp->len = dp->avpacket->size;
return dp;
}
// (buf must include proper padding)
struct demux_packet *new_demux_packet_from_buf(struct AVBufferRef *buf)
{
AVPacket pkt = {
.size = buf->size,
.data = buf->data,
.buf = buf,
};
return new_demux_packet_from_avpacket(&pkt);
}
// Input data doesn't need to be padded.
struct demux_packet *new_demux_packet_from(void *data, size_t len)
{
if (len > INT_MAX)
return NULL;
AVPacket pkt = { .data = data, .size = len };
return new_demux_packet_from_avpacket(&pkt);
}
struct demux_packet *new_demux_packet(size_t len)
{
if (len > INT_MAX)
return NULL;
AVPacket pkt = { .data = NULL, .size = len };
return new_demux_packet_from_avpacket(&pkt);
}
void demux_packet_shorten(struct demux_packet *dp, size_t len)
{
assert(len <= dp->len);
dp->len = len;
memset(dp->buffer + dp->len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
void free_demux_packet(struct demux_packet *dp)
{
talloc_free(dp);
}
void demux_packet_copy_attribs(struct demux_packet *dst, struct demux_packet *src)
{
dst->pts = src->pts;
dst->dts = src->dts;
dst->duration = src->duration;
dst->pos = src->pos;
dst->segmented = src->segmented;
dst->start = src->start;
dst->end = src->end;
dst->codec = src->codec;
dst->keyframe = src->keyframe;
dst->stream = src->stream;
}
struct demux_packet *demux_copy_packet(struct demux_packet *dp)
{
struct demux_packet *new = NULL;
if (dp->avpacket) {
new = new_demux_packet_from_avpacket(dp->avpacket);
} else {
// Some packets might be not created by new_demux_packet*().
new = new_demux_packet_from(dp->buffer, dp->len);
}
if (!new)
return NULL;
demux_packet_copy_attribs(new, dp);
return new;
}
#define ROUND_ALLOC(s) MP_ALIGN_UP(s, 64)
// Attempt to estimate the total memory consumption of the given packet.
// This is important if we store thousands of packets and not to exceed
// user-provided limits. Of course we can't know how much memory internal
// fragmentation of the libc memory allocator will waste.
// Note that this should return a "stable" value - e.g. if a new packet ref
// is created, this should return the same value with the new ref. (This
// implies the value is not exact and does not return the actual size of
// memory wasted due to internal fragmentation.)
size_t demux_packet_estimate_total_size(struct demux_packet *dp)
{
size_t size = ROUND_ALLOC(sizeof(struct demux_packet));
size += ROUND_ALLOC(dp->len);
if (dp->avpacket) {
size += ROUND_ALLOC(sizeof(AVPacket));
size += ROUND_ALLOC(sizeof(AVBufferRef));
size += 64; // upper bound estimate on sizeof(AVBuffer)
size += ROUND_ALLOC(dp->avpacket->side_data_elems *
sizeof(dp->avpacket->side_data[0]));
for (int n = 0; n < dp->avpacket->side_data_elems; n++)
size += ROUND_ALLOC(dp->avpacket->side_data[n].size);
}
return size;
}
int demux_packet_set_padding(struct demux_packet *dp, int start, int end)
{
#if LIBAVCODEC_VERSION_MICRO >= 100
if (!start && !end)
return 0;
if (!dp->avpacket)
return -1;
uint8_t *p = av_packet_new_side_data(dp->avpacket, AV_PKT_DATA_SKIP_SAMPLES, 10);
if (!p)
return -1;
AV_WL32(p + 0, start);
AV_WL32(p + 4, end);
#endif
return 0;
}
int demux_packet_add_blockadditional(struct demux_packet *dp, uint64_t id,
void *data, size_t size)
{
#if LIBAVCODEC_VERSION_MICRO >= 100
if (!dp->avpacket)
return -1;
uint8_t *sd = av_packet_new_side_data(dp->avpacket,
AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
8 + size);
if (!sd)
return -1;
AV_WB64(sd, id);
if (size > 0)
memcpy(sd + 8, data, size);
#endif
return 0;
}
|
