srtpproto: fix option flag type
[libav.git] / libavformat / srtpproto.c
1 /*
2 * SRTP network protocol
3 * Copyright (c) 2012 Martin Storsjo
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/opt.h"
23 #include "avformat.h"
24 #include "avio_internal.h"
25 #include "url.h"
26
27 #include "internal.h"
28 #include "rtpdec.h"
29 #include "srtp.h"
30
31 typedef struct SRTPProtoContext {
32 const AVClass *class;
33 URLContext *rtp_hd;
34 const char *out_suite, *out_params;
35 const char *in_suite, *in_params;
36 struct SRTPContext srtp_out, srtp_in;
37 uint8_t encryptbuf[RTP_MAX_PACKET_LENGTH];
38 } SRTPProtoContext;
39
40 #define D AV_OPT_FLAG_DECODING_PARAM
41 #define E AV_OPT_FLAG_ENCODING_PARAM
42 static const AVOption options[] = {
43 { "srtp_out_suite", "", offsetof(SRTPProtoContext, out_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
44 { "srtp_out_params", "", offsetof(SRTPProtoContext, out_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
45 { "srtp_in_suite", "", offsetof(SRTPProtoContext, in_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
46 { "srtp_in_params", "", offsetof(SRTPProtoContext, in_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
47 { NULL }
48 };
49
50 static const AVClass srtp_context_class = {
51 .class_name = "srtp",
52 .item_name = av_default_item_name,
53 .option = options,
54 .version = LIBAVUTIL_VERSION_INT,
55 };
56
57 static int srtp_close(URLContext *h)
58 {
59 SRTPProtoContext *s = h->priv_data;
60 ff_srtp_free(&s->srtp_out);
61 ff_srtp_free(&s->srtp_in);
62 ffurl_close(s->rtp_hd);
63 s->rtp_hd = NULL;
64 return 0;
65 }
66
67 static int srtp_open(URLContext *h, const char *uri, int flags)
68 {
69 SRTPProtoContext *s = h->priv_data;
70 char hostname[256], buf[1024], path[1024];
71 int rtp_port, ret;
72
73 if (s->out_suite && s->out_params)
74 if ((ret = ff_srtp_set_crypto(&s->srtp_out, s->out_suite, s->out_params)) < 0)
75 goto fail;
76 if (s->in_suite && s->in_params)
77 if ((ret = ff_srtp_set_crypto(&s->srtp_in, s->in_suite, s->in_params)) < 0)
78 goto fail;
79
80 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
81 path, sizeof(path), uri);
82 ff_url_join(buf, sizeof(buf), "rtp", NULL, hostname, rtp_port, "%s", path);
83 if ((ret = ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL)) < 0)
84 goto fail;
85
86 h->max_packet_size = FFMIN(s->rtp_hd->max_packet_size,
87 sizeof(s->encryptbuf)) - 14;
88 h->is_streamed = 1;
89 return 0;
90
91 fail:
92 srtp_close(h);
93 return ret;
94 }
95
96 static int srtp_read(URLContext *h, uint8_t *buf, int size)
97 {
98 SRTPProtoContext *s = h->priv_data;
99 int ret;
100 start:
101 ret = ffurl_read(s->rtp_hd, buf, size);
102 if (ret > 0 && s->srtp_in.aes) {
103 if (ff_srtp_decrypt(&s->srtp_in, buf, &ret) < 0)
104 goto start;
105 }
106 return ret;
107 }
108
109 static int srtp_write(URLContext *h, const uint8_t *buf, int size)
110 {
111 SRTPProtoContext *s = h->priv_data;
112 if (!s->srtp_out.aes)
113 return ffurl_write(s->rtp_hd, buf, size);
114 size = ff_srtp_encrypt(&s->srtp_out, buf, size, s->encryptbuf,
115 sizeof(s->encryptbuf));
116 if (size < 0)
117 return size;
118 return ffurl_write(s->rtp_hd, s->encryptbuf, size);
119 }
120
121 static int srtp_get_file_handle(URLContext *h)
122 {
123 SRTPProtoContext *s = h->priv_data;
124 return ffurl_get_file_handle(s->rtp_hd);
125 }
126
127 static int srtp_get_multi_file_handle(URLContext *h, int **handles,
128 int *numhandles)
129 {
130 SRTPProtoContext *s = h->priv_data;
131 return ffurl_get_multi_file_handle(s->rtp_hd, handles, numhandles);
132 }
133
134 URLProtocol ff_srtp_protocol = {
135 .name = "srtp",
136 .url_open = srtp_open,
137 .url_read = srtp_read,
138 .url_write = srtp_write,
139 .url_close = srtp_close,
140 .url_get_file_handle = srtp_get_file_handle,
141 .url_get_multi_file_handle = srtp_get_multi_file_handle,
142 .priv_data_size = sizeof(SRTPProtoContext),
143 .priv_data_class = &srtp_context_class,
144 .flags = URL_PROTOCOL_FLAG_NETWORK,
145 };