Move H.264 intra prediction functions into their own context
[libav.git] / libavformat / sdp.c
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1/*
2 * copyright (c) 2007 Luca Abeni
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "avstring.h"
22#include "avformat.h"
23
7ba32703 24#ifdef CONFIG_RTP_MUXER
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25#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
26
27struct sdp_session_level {
28 int sdp_version; /**< protocol version (currently 0) */
29 int id; /**< session id */
30 int version; /**< session version */
31 int start_time; /**< session start time (NTP time, in seconds),
32 or 0 in case of permanent session */
33 int end_time; /**< session end time (NTP time, in seconds),
34 or 0 if the session is not bounded */
35 int ttl; /**< TTL, in case of multicast stream */
36 const char *user; /**< username of the session's creator */
37 const char *src_addr; /**< IP address of the machine from which the session was created */
38 const char *dst_addr; /**< destination IP address (can be multicast) */
39 const char *name; /**< session name (can be an empty string) */
40};
41
42static void dest_write(char *buff, int size, const char *dest_addr, int ttl)
43{
44 if (dest_addr) {
45 if (ttl > 0) {
46 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
47 } else {
48 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);
49 }
50 }
51}
52
53static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
54{
55 av_strlcatf(buff, size, "v=%d\r\n"
56 "o=- %d %d IN IPV4 %s\r\n"
57 "t=%d %d\r\n"
58 "s=%s\r\n"
59 "a=tool:libavformat\r\n",
60 s->sdp_version,
61 s->id, s->version, s->src_addr,
62 s->start_time, s->end_time,
63 s->name[0] ? s->name : "No Name");
64 dest_write(buff, size, s->dst_addr, s->ttl);
65}
66
67static int get_address(char *dest_addr, int size, int *ttl, const char *url)
68{
69 int port;
70 const char *p;
71
72 url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url);
73
74 *ttl = 0;
75 p = strchr(url, '?');
76 if (p) {
77 char buff[64];
78 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
79
80 if (is_multicast) {
81 if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
82 *ttl = strtol(buff, NULL, 10);
83 } else {
84 *ttl = 5;
85 }
86 }
87 }
88
89 return port;
90}
91
92static void digit_to_char(char *dst, uint8_t src)
93{
94 if (src < 10) {
95 *dst = '0' + src;
96 } else {
97 *dst = 'A' + src - 10;
98 }
99}
100
101static char *data_to_hex(char *buff, const uint8_t *src, int s)
102{
103 int i;
104
105 for(i = 0; i < s; i++) {
106 digit_to_char(buff + 2 * i, src[i] >> 4);
107 digit_to_char(buff + 2 * i + 1, src[i] & 0xF);
108 }
109
110 return buff;
111}
112
113static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
114{
115 char *config = NULL;
116
117 switch (c->codec_id) {
118 case CODEC_ID_MPEG4:
119 if (c->flags & CODEC_FLAG_GLOBAL_HEADER) {
120 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
121 av_log(NULL, AV_LOG_ERROR, "Too many extra data!\n");
122
123 return NULL;
124 }
125 config = av_malloc(10 + c->extradata_size * 2);
126 if (config == NULL) {
127 av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");
128 return NULL;
129 }
130 memcpy(config, "; config=", 9);
131 data_to_hex(config + 9, c->extradata, c->extradata_size);
132 config[9 + c->extradata_size * 2] = 0;
133 }
134 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
135 "a=fmtp:%d profile-level-id=1%s\r\n",
136 payload_type,
137 payload_type, config ? config : "");
138 break;
139 default:
140 /* Nothing special to do, here... */
141 break;
142 }
143
144 av_free(config);
145
146 return buff;
147}
148
149static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
150{
151 const char *type;
152 int payload_type;
153
154 payload_type = rtp_get_payload_type(c);
155 if (payload_type < 0) {
156 payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */
157 }
158
159 switch (c->codec_type) {
160 case CODEC_TYPE_VIDEO : type = "video" ; break;
161 case CODEC_TYPE_AUDIO : type = "audio" ; break;
162 case CODEC_TYPE_SUBTITLE: type = "text" ; break;
163 default : type = "application"; break;
164 }
165
166 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
167 dest_write(buff, size, dest_addr, ttl);
168
169 sdp_media_attributes(buff, size, c, payload_type);
170}
171
8767b80f 172int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
c5388c07 173{
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174 struct sdp_session_level s;
175 int i, j, port, ttl;
176 char dst[32];
177
5f2cbb53 178 memset(buff, 0, size);
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179 memset(&s, 0, sizeof(struct sdp_session_level));
180 s.user = "-";
181 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
182 s.name = ac[0]->title;
183
184 port = 0;
185 ttl = 0;
186 if (n_files == 1) {
187 port = get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
188 if (port > 0) {
189 s.dst_addr = dst;
190 s.ttl = ttl;
191 }
192 }
8767b80f 193 sdp_write_header(buff, size, &s);
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194
195 dst[0] = 0;
196 for (i = 0; i < n_files; i++) {
197 if (n_files != 1) {
198 port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
199 }
200 for (j = 0; j < ac[i]->nb_streams; j++) {
8767b80f 201 sdp_write_media(buff, size,
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202 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
203 (port > 0) ? port + j * 2 : 0, ttl);
204 if (port <= 0) {
8767b80f 205 av_strlcatf(buff, size,
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206 "a=control:streamid=%d\r\n", i + j);
207 }
208 }
209 }
210
8767b80f 211 return 0;
c5388c07 212}
7ba32703 213#else
8767b80f 214int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
7ba32703 215{
8767b80f 216 return AVERROR(ENOSYS);
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217}
218#endif