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
|
/*
* Sorenson-3 (SVQ3/SV3V) payload for RTP
* Copyright (c) 2010 Ronald S. Bultje
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* @brief RTP support for the SV3V (SVQ3) payload
* @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
*/
#include <string.h>
#include "libavutil/intreadwrite.h"
#include "rtp.h"
#include "rtpdec.h"
#include "rtpdec_formats.h"
struct PayloadContext {
AVIOContext *pktbuf;
int64_t timestamp;
};
/** return 0 on packet, <0 on partial packet or error... */
static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
AVStream *st, AVPacket *pkt,
uint32_t *timestamp,
const uint8_t *buf, int len, int flags)
{
int config_packet, start_packet, end_packet;
if (len < 2)
return AVERROR_INVALIDDATA;
config_packet = buf[0] & 0x40;
start_packet = buf[0] & 0x20;
end_packet = buf[0] & 0x10;
buf += 2; // ignore buf[1]
len -= 2;
if (config_packet) {
av_freep(&st->codec->extradata);
st->codec->extradata_size = 0;
if (len < 2 || !(st->codec->extradata =
av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
return AVERROR_INVALIDDATA;
st->codec->extradata_size = len + 8;
memcpy(st->codec->extradata, "SEQH", 4);
AV_WB32(st->codec->extradata + 4, len);
memcpy(st->codec->extradata + 8, buf, len);
/* We set codec_id to AV_CODEC_ID_NONE initially to
* delay decoder initialization since extradata is
* carried within the RTP stream, not SDP. Here,
* by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
* to the decoder that it is OK to initialize. */
st->codec->codec_id = AV_CODEC_ID_SVQ3;
return AVERROR(EAGAIN);
}
if (start_packet) {
int res;
if (sv->pktbuf) {
uint8_t *tmp;
avio_close_dyn_buf(sv->pktbuf, &tmp);
av_free(tmp);
}
if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
return res;
sv->timestamp = *timestamp;
}
if (!sv->pktbuf)
return AVERROR_INVALIDDATA;
avio_write(sv->pktbuf, buf, len);
if (end_packet) {
av_init_packet(pkt);
pkt->stream_index = st->index;
*timestamp = sv->timestamp;
pkt->size = avio_close_dyn_buf(sv->pktbuf, &pkt->data);
pkt->destruct = av_destruct_packet;
sv->pktbuf = NULL;
return 0;
}
return AVERROR(EAGAIN);
}
static PayloadContext *svq3_extradata_new(void)
{
return av_mallocz(sizeof(PayloadContext));
}
static void svq3_extradata_free(PayloadContext *sv)
{
if (sv->pktbuf) {
uint8_t *buf;
avio_close_dyn_buf(sv->pktbuf, &buf);
av_free(buf);
}
av_free(sv);
}
RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
.enc_name = "X-SV3V-ES",
.codec_type = AVMEDIA_TYPE_VIDEO,
.codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
.alloc = svq3_extradata_new,
.free = svq3_extradata_free,
.parse_packet = svq3_parse_packet,
};
|
