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
|
/*
* RTP parser for DV payload format (RFC 6469)
* Copyright (c) 2015 Thomas Volkert <thomas@homer-conferencing.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavcodec/bytestream.h"
#include "rtpdec_formats.h"
struct PayloadContext {
AVIOContext *buf;
uint32_t timestamp;
int bundled_audio;
};
static void dv_free_dyn_buffer(AVIOContext **dyn_buf)
{
uint8_t *ptr_dyn_buffer;
avio_close_dyn_buf(*dyn_buf, &ptr_dyn_buffer);
av_free(ptr_dyn_buffer);
*dyn_buf = NULL;
}
static av_cold void dv_free_context(PayloadContext *data)
{
dv_free_dyn_buffer(&data->buf);
}
static av_cold int dv_sdp_parse_fmtp_config(AVFormatContext *s,
AVStream *stream,
PayloadContext *dv_data,
const char *attr, const char *value)
{
/* does the DV stream include audio? */
if (!strcmp(attr, "audio") && !strcmp(value, "bundled"))
dv_data->bundled_audio = 1;
/* extract the DV profile */
if (!strcmp(attr, "encode")) {
/* SD-VCR/525-60 */
/* SD-VCR/625-50 */
/* HD-VCR/1125-60 */
/* HD-VCR/1250-50 */
/* SDL-VCR/525-60 */
/* SDL-VCR/625-50 */
/* 314M-25/525-60 */
/* 314M-25/625-50 */
/* 314M-50/525-60 */
/* 314M-50/625-50 */
/* 370M/1080-60i */
/* 370M/1080-50i */
/* 370M/720-60p */
/* 370M/720-50p */
/* 306M/525-60 (for backward compatibility) */
/* 306M/625-50 (for backward compatibility) */
}
return 0;
}
static av_cold int dv_parse_sdp_line(AVFormatContext *ctx, int st_index,
PayloadContext *dv_data, const char *line)
{
AVStream *current_stream;
const char *sdp_line_ptr = line;
if (st_index < 0)
return 0;
current_stream = ctx->streams[st_index];
if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
return ff_parse_fmtp(ctx, current_stream, dv_data, sdp_line_ptr,
dv_sdp_parse_fmtp_config);
}
return 0;
}
static int dv_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_dv_ctx,
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
const uint8_t *buf, int len, uint16_t seq,
int flags)
{
int res = 0;
/* drop data of previous packets in case of non-continuous (lossy) packet stream */
if (rtp_dv_ctx->buf && rtp_dv_ctx->timestamp != *timestamp) {
dv_free_dyn_buffer(&rtp_dv_ctx->buf);
}
/* sanity check for size of input packet: 1 byte payload at least */
if (len < 1) {
av_log(ctx, AV_LOG_ERROR, "Too short RTP/DV packet, got %d bytes\n", len);
return AVERROR_INVALIDDATA;
}
/* start frame buffering with new dynamic buffer */
if (!rtp_dv_ctx->buf) {
res = avio_open_dyn_buf(&rtp_dv_ctx->buf);
if (res < 0)
return res;
/* update the timestamp in the frame packet with the one from the RTP packet */
rtp_dv_ctx->timestamp = *timestamp;
}
/* write the fragment to the dyn. buffer */
avio_write(rtp_dv_ctx->buf, buf, len);
/* RTP marker bit means: last fragment of current frame was received;
otherwise, an additional fragment is needed for the current frame */
if (!(flags & RTP_FLAG_MARKER))
return AVERROR(EAGAIN);
/* close frame buffering and create resulting A/V packet */
res = ff_rtp_finalize_packet(pkt, &rtp_dv_ctx->buf, st->index);
if (res < 0)
return res;
return 0;
}
RTPDynamicProtocolHandler ff_dv_dynamic_handler = {
.enc_name = "DV",
.codec_type = AVMEDIA_TYPE_VIDEO,
.codec_id = AV_CODEC_ID_DVVIDEO,
.need_parsing = AVSTREAM_PARSE_FULL,
.parse_sdp_a_line = dv_parse_sdp_line,
.priv_data_size = sizeof(PayloadContext),
.free = dv_free_context,
.parse_packet = dv_handle_packet,
};
|
