FFmpeg: libavformat/sapenc.c Source File

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libavformat

sapenc.c

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1 /*

2 * Session Announcement Protocol (RFC 2974) muxer

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 #include "avformat.h"

23 #include "libavutil/parseutils.h"

24 #include "libavutil/random_seed.h"

25 #include "libavutil/avstring.h"

26 #include "libavutil/dict.h"

27 #include "libavutil/intreadwrite.h"

28 #include "libavutil/time.h"

29 #include "internal.h"

30 #include "mux.h"

31 #include "network.h"

32 #include "os_support.h"

33 #include "rtpenc_chain.h"

34 #include "url.h"

36 struct SAPState {

37 uint8_t *ann;

38 int ann_size;

39 URLContext *ann_fd;

40 int64_t last_time;

41 };

43 static int sap_write_close(AVFormatContext *s)

44 {

45 struct SAPState *sap = s->priv_data;

46 int i;

48 for (i = 0; i < s->nb_streams; i++) {

49 AVFormatContext *rtpctx = s->streams[i]->priv_data;

50 if (!rtpctx)

51 continue;

52 av_write_trailer(rtpctx);

53 avio_closep(&rtpctx->pb);

54 avformat_free_context(rtpctx);

55 s->streams[i]->priv_data = NULL;

56 }

58 if (sap->last_time && sap->ann && sap->ann_fd) {

59 sap->ann[0] |= 4; /* Session deletion*/

60 ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);

61 }

63 av_freep(&sap->ann);

64 ffurl_closep(&sap->ann_fd);

65 ff_network_close();

66 return 0;

67 }

69 static int sap_write_header(AVFormatContext *s)

70 {

71 struct SAPState *sap = s->priv_data;

72 char host[1024], path[1024], url[1024], announce_addr[50] = "";

73 char *option_list;

74 int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;

75 AVFormatContext **contexts = NULL;

76 int ret = 0;

77 struct sockaddr_storage localaddr;

78 socklen_t addrlen = sizeof(localaddr);

79 int udp_fd;

80 AVDictionaryEntry* title = av_dict_get(s->metadata, "title", NULL, 0);

82 if (!ff_network_init())

83 return AVERROR(EIO);

85 /* extract hostname and port */

86 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port,

87 path, sizeof(path), s->url);

88 if (base_port < 0)

89 base_port = 5004;

91 /* search for options */

92 option_list = strrchr(path, '?');

93 if (option_list) {

94 char buf[50];

95 if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) {

96 port = strtol(buf, NULL, 10);

97 }

98 if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) {

99 same_port = strtol(buf, NULL, 10);

100 }

101 if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) {

102 ttl = strtol(buf, NULL, 10);

103 }

104 if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {

105 av_strlcpy(announce_addr, buf, sizeof(announce_addr));

106 }

107 }

108

109 if (!announce_addr[0]) {

110 struct addrinfo hints = { 0 }, *ai = NULL;

111 hints.ai_family = AF_UNSPEC;

112 if (getaddrinfo(host, NULL, &hints, &ai)) {

113 av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host);

114 ret = AVERROR(EIO);

115 goto fail;

116 }

117 if (ai->ai_family == AF_INET) {

118 /* Also known as sap.mcast.net */

119 av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr));

120 #if HAVE_STRUCT_SOCKADDR_IN6

121 } else if (ai->ai_family == AF_INET6) {

122 /* With IPv6, you can use the same destination in many different

123 * multicast subnets, to choose how far you want it routed.

124 * This one is intended to be routed globally. */

125 av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));

126 #endif

127 } else {

128 freeaddrinfo(ai);

129 av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "

130 "address family\n", host);

131 ret = AVERROR(EIO);

132 goto fail;

133 }

134 freeaddrinfo(ai);

135 }

136

137 contexts = av_calloc(s->nb_streams, sizeof(*contexts));

138 if (!contexts) {

139 ret = AVERROR(ENOMEM);

140 goto fail;

141 }

142

143 if (s->start_time_realtime == 0 || s->start_time_realtime == AV_NOPTS_VALUE)

144 s->start_time_realtime = av_gettime();

145 for (i = 0; i < s->nb_streams; i++) {

146 URLContext *fd;

147 char *new_url;

148

149 ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,

150 "?ttl=%d", ttl);

151 if (!same_port)

152 base_port += 2;

153 ret = ffurl_open_whitelist(&fd, url, AVIO_FLAG_WRITE,

154 &s->interrupt_callback, NULL,

155 s->protocol_whitelist, s->protocol_blacklist, NULL);

156 if (ret) {

157 ret = AVERROR(EIO);

158 goto fail;

159 }

160 ret = ff_rtp_chain_mux_open(&contexts[i], s, s->streams[i], fd, 0, i);

161 if (ret < 0)

162 goto fail;

163 s->streams[i]->priv_data = contexts[i];

164 s->streams[i]->time_base = contexts[i]->streams[0]->time_base;

165 new_url = av_strdup(url);

166 if (!new_url) {

167 ret = AVERROR(ENOMEM);

168 goto fail;

169 }

170 ff_format_set_url(contexts[i], new_url);

171 }

172

173 if (s->nb_streams > 0 && title)

174 av_dict_set(&contexts[0]->metadata, "title", title->value, 0);

175

176 ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,

177 "?ttl=%d&connect=1", ttl);

178 ret = ffurl_open_whitelist(&sap->ann_fd, url, AVIO_FLAG_WRITE,

179 &s->interrupt_callback, NULL,

180 s->protocol_whitelist, s->protocol_blacklist, NULL);

181 if (ret) {

182 ret = AVERROR(EIO);

183 goto fail;

184 }

185

186 udp_fd = ffurl_get_file_handle(sap->ann_fd);

187 if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {

188 ret = AVERROR(EIO);

189 goto fail;

190 }

191 if (localaddr.ss_family != AF_INET

192 #if HAVE_STRUCT_SOCKADDR_IN6

193 && localaddr.ss_family != AF_INET6

194 #endif

195 ) {

196 av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");

197 ret = AVERROR(EIO);

198 goto fail;

199 }

200 sap->ann_size = 8192;

201 sap->ann = av_mallocz(sap->ann_size);

202 if (!sap->ann) {

203 ret = AVERROR(EIO);

204 goto fail;

205 }

206 sap->ann[pos] = (1 << 5);

207 #if HAVE_STRUCT_SOCKADDR_IN6

208 if (localaddr.ss_family == AF_INET6)

209 sap->ann[pos] |= 0x10;

210 #endif

211 pos++;

212 sap->ann[pos++] = 0; /* Authentication length */

213 AV_WB16(&sap->ann[pos], av_get_random_seed());

214 pos += 2;

215 if (localaddr.ss_family == AF_INET) {

216 memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,

217 sizeof(struct in_addr));

218 pos += sizeof(struct in_addr);

219 #if HAVE_STRUCT_SOCKADDR_IN6

220 } else {

221 memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,

222 sizeof(struct in6_addr));

223 pos += sizeof(struct in6_addr);

224 #endif

225 }

226

227 av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);

228 pos += strlen(&sap->ann[pos]) + 1;

229

230 if (av_sdp_create(contexts, s->nb_streams, &sap->ann[pos],

231 sap->ann_size - pos)) {

232 ret = AVERROR_INVALIDDATA;

233 goto fail;

234 }

235 av_freep(&contexts);

236 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);

237 pos += strlen(&sap->ann[pos]);

238 sap->ann_size = pos;

239

240 if (sap->ann_size > sap->ann_fd->max_packet_size) {

241 av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "

242 "packet\n");

243 goto fail;

244 }

245

246 return 0;

247

248 fail:

249 av_free(contexts);

250 sap_write_close(s);

251 return ret;

252 }

253

254 static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)

255 {

256 AVFormatContext *rtpctx;

257 struct SAPState *sap = s->priv_data;

258 int64_t now = av_gettime_relative();

259

260 if (!sap->last_time || now - sap->last_time > 5000000) {

261 int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);

262 /* Don't abort even if we get "Destination unreachable" */

263 if (ret < 0 && ret != AVERROR(ECONNREFUSED))

264 return ret;

265 sap->last_time = now;

266 }

267 rtpctx = s->streams[pkt->stream_index]->priv_data;

268 return ff_write_chained(rtpctx, 0, pkt, s, 0);

269 }

270

271 const FFOutputFormat ff_sap_muxer = {

272 .p.name = "sap",

273 .p.long_name = NULL_IF_CONFIG_SMALL("SAP output"),

274 .priv_data_size = sizeof(struct SAPState),

275 .p.audio_codec = AV_CODEC_ID_AAC,

276 .p.video_codec = AV_CODEC_ID_MPEG4,

277 .write_header = sap_write_header,

278 .write_packet = sap_write_packet,

279 .write_trailer = sap_write_close,

280 .p.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,

281 };

av_gettime_relative

int64_t av_gettime_relative(void)

Get the current time in microseconds since some unspecified starting point.

Definition: time.c:56

AVOutputFormat::name

const char * name

Definition: avformat.h:508

AVERROR

Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions

av_find_info_tag

int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)

Attempt to find a specific tag in a URL.

Definition: parseutils.c:753

SAPState::ann_fd

URLContext * ann_fd

Definition: sapdec.c:36

sap_write_packet

static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)

Definition: sapenc.c:254

AV_CODEC_ID_MPEG4

@ AV_CODEC_ID_MPEG4

Definition: codec_id.h:64

AVFormatContext::streams

AVStream ** streams

A list of all streams in the file.

Definition: avformat.h:1172

URLContext::max_packet_size

int max_packet_size

if non zero, the stream is packetized with this max packet size

Definition: url.h:43

SAPState

Definition: sapdec.c:35

AV_LOG_VERBOSE

#define AV_LOG_VERBOSE

Detailed information.

Definition: log.h:196

SAPState::ann

uint8_t * ann

Definition: sapenc.c:37

ff_sap_muxer

const FFOutputFormat ff_sap_muxer

Definition: sapenc.c:271

ff_network_close

void ff_network_close(void)

Definition: network.c:116

os_support.h

sockaddr_storage

Definition: network.h:111

ff_network_init

int ff_network_init(void)

Definition: network.c:58

FFOutputFormat::p

AVOutputFormat p

The public AVOutputFormat.

Definition: mux.h:34

av_get_random_seed

uint32_t av_get_random_seed(void)

Get a seed to use in conjunction with random functions.

Definition: random_seed.c:121

freeaddrinfo

#define freeaddrinfo

Definition: network.h:218

fail

#define fail()

Definition: checkasm.h:134

rtpenc_chain.h

pkt

AVPacket * pkt

Definition: movenc.c:59

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:180

av_dict_get

AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)

Get a dictionary entry with matching key.

Definition: dict.c:60

ffurl_open_whitelist

int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)

Create an URLContext for accessing to the resource indicated by url, and open it.

Definition: avio.c:306

intreadwrite.h

#define s(width, name)

Definition: cbs_vp9.c:256

ff_url_join

int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)

Definition: url.c:38

AVIO_FLAG_WRITE

#define AVIO_FLAG_WRITE

write-only

Definition: avio.h:624

AVFormatContext

Format I/O context.

Definition: avformat.h:1104

internal.h

AVStream::time_base

AVRational time_base

This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.

Definition: avformat.h:877

NULL

#define NULL

Definition: coverity.c:32

AV_WB16

#define AV_WB16(p, v)

Definition: intreadwrite.h:405

AVFormatContext::pb

AVIOContext * pb

I/O context.

Definition: avformat.h:1146

parseutils.h

FFOutputFormat

Definition: mux.h:30

time.h

AV_CODEC_ID_AAC

@ AV_CODEC_ID_AAC

Definition: codec_id.h:440

addrinfo::ai_family

int ai_family

Definition: network.h:139

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.

Definition: internal.h:115

AV_NOPTS_VALUE

#define AV_NOPTS_VALUE

Undefined timestamp value.

Definition: avutil.h:248

AVFMT_NOFILE

#define AVFMT_NOFILE

Demuxer will use avio_open, no opened file should be provided by the caller.

Definition: avformat.h:468

av_sdp_create

int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)

Generate an SDP for an RTP session.

Definition: sdp.c:911

getaddrinfo

#define getaddrinfo

Definition: network.h:217

avio_closep

int avio_closep(AVIOContext **s)

Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...

Definition: aviobuf.c:1280

av_write_trailer

int av_write_trailer(AVFormatContext *s)

Write the stream trailer to an output media file and free the file private data.

Definition: mux.c:1256

URLContext

Definition: url.h:37

AVFMT_GLOBALHEADER

#define AVFMT_GLOBALHEADER

Format wants global header.

Definition: avformat.h:478

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:269

av_url_split

void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)

Split a URL string into components.

Definition: utils.c:357

url.h

av_mallocz

void * av_mallocz(size_t size)

Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...

Definition: mem.c:254

av_calloc

void * av_calloc(size_t nmemb, size_t size)

Definition: mem.c:262

SAPState::ann_size

int ann_size