2 * copyright (c) 2007 Luca Abeni
4 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avstring.h"
23 #include "libavutil/base64.h"
24 #include "libavutil/parseutils.h"
25 #include "libavcodec/xiph.h"
35 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
37 struct sdp_session_level {
38 int sdp_version; /**< protocol version (currently 0) */
39 int id; /**< session ID */
40 int version; /**< session version */
41 int start_time; /**< session start time (NTP time, in seconds),
42 or 0 in case of permanent session */
43 int end_time; /**< session end time (NTP time, in seconds),
44 or 0 if the session is not bounded */
45 int ttl; /**< TTL, in case of multicast stream */
46 const char *user; /**< username of the session's creator */
47 const char *src_addr; /**< IP address of the machine from which the session was created */
48 const char *src_type; /**< address type of src_addr */
49 const char *dst_addr; /**< destination IP address (can be multicast) */
50 const char *dst_type; /**< destination IP address type */
51 const char *name; /**< session name (can be an empty string) */
54 static void sdp_write_address(char *buff, int size, const char *dest_addr,
55 const char *dest_type, int ttl)
60 if (ttl > 0 && !strcmp(dest_type, "IP4")) {
61 /* The TTL should only be specified for IPv4 multicast addresses,
63 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
65 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
70 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
72 av_strlcatf(buff, size, "v=%d\r\n"
73 "o=- %d %d IN %s %s\r\n"
76 s->id, s->version, s->src_type, s->src_addr,
78 sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
79 av_strlcatf(buff, size, "t=%d %d\r\n"
80 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
81 s->start_time, s->end_time);
85 static int resolve_destination(char *dest_addr, int size, char *type,
88 struct addrinfo hints, *ai;
91 av_strlcpy(type, "IP4", type_size);
95 /* Resolve the destination, since it must be written
96 * as a numeric IP address in the SDP. */
98 memset(&hints, 0, sizeof(hints));
99 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
101 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
102 NULL, 0, NI_NUMERICHOST);
104 if (ai->ai_family == AF_INET6)
105 av_strlcpy(type, "IP6", type_size);
107 is_multicast = ff_is_multicast_address(ai->ai_addr);
112 static int resolve_destination(char *dest_addr, int size, char *type,
119 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
125 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
129 if (strcmp(proto, "rtp")) {
130 /* The url isn't for the actual rtp sessions,
131 * don't parse out anything else than the destination.
136 p = strchr(url, '?');
140 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
141 *ttl = strtol(buff, NULL, 10);
150 #define MAX_PSET_SIZE 1024
151 static char *extradata2psets(AVCodecContext *c)
155 const char *pset_string = "; sprop-parameter-sets=";
157 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
158 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
162 if (c->extradata[0] == 1) {
165 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
168 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
172 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
173 av_bitstream_filter_close(bsfc);
176 psets = av_mallocz(MAX_PSET_SIZE);
178 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
181 memcpy(psets, pset_string, strlen(pset_string));
182 p = psets + strlen(pset_string);
183 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
184 while (r < c->extradata + c->extradata_size) {
189 nal_type = *r & 0x1f;
190 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
191 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
195 if (p != (psets + strlen(pset_string))) {
199 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
200 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
212 static char *extradata2config(AVCodecContext *c)
216 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
217 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
221 config = av_malloc(10 + c->extradata_size * 2);
222 if (config == NULL) {
223 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
226 memcpy(config, "; config=", 9);
227 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
228 config[9 + c->extradata_size * 2] = 0;
233 static char *xiph_extradata2config(AVCodecContext *c)
235 char *config, *encoded_config;
236 uint8_t *header_start[3];
237 int headers_len, header_len[3], config_len;
238 int first_header_size;
240 switch (c->codec_id) {
241 case CODEC_ID_THEORA:
242 first_header_size = 42;
244 case CODEC_ID_VORBIS:
245 first_header_size = 30;
248 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
252 if (ff_split_xiph_headers(c->extradata, c->extradata_size,
253 first_header_size, header_start,
255 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
259 headers_len = header_len[0] + header_len[2];
260 config_len = 4 + // count
265 headers_len; // and the rest
267 config = av_malloc(config_len);
271 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
272 if (!encoded_config) {
277 config[0] = config[1] = config[2] = 0;
279 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
280 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
281 config[6] = (RTP_XIPH_IDENT ) & 0xff;
282 config[7] = (headers_len >> 8) & 0xff;
283 config[8] = headers_len & 0xff;
285 config[10] = header_len[0];
286 config[11] = 0; // size of comment header; nonexistent
287 memcpy(config + 12, header_start[0], header_len[0]);
288 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
290 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
294 return encoded_config;
297 av_log(c, AV_LOG_ERROR,
298 "Not enough memory for configuration string\n");
302 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
306 switch (c->codec_id) {
308 if (c->extradata_size) {
309 config = extradata2psets(c);
311 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
312 "a=fmtp:%d packetization-mode=1%s\r\n",
314 payload_type, config ? config : "");
318 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
319 * actually specifies the maximum video size, but we only know
320 * the current size. This is required for playback on Android
321 * stagefright and on Samsung bada. */
322 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
323 "a=framesize:%d %d-%d\r\n",
325 payload_type, c->width, c->height);
328 if (c->extradata_size) {
329 config = extradata2config(c);
331 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
332 "a=fmtp:%d profile-level-id=1%s\r\n",
334 payload_type, config ? config : "");
337 if (c->extradata_size) {
338 config = extradata2config(c);
340 /* FIXME: maybe we can forge config information based on the
341 * codec parameters...
343 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
346 if (config == NULL) {
349 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
350 "a=fmtp:%d profile-level-id=1;"
351 "mode=AAC-hbr;sizelength=13;indexlength=3;"
352 "indexdeltalength=3%s\r\n",
353 payload_type, c->sample_rate, c->channels,
354 payload_type, config);
356 case CODEC_ID_PCM_S16BE:
357 if (payload_type >= RTP_PT_PRIVATE)
358 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
360 c->sample_rate, c->channels);
362 case CODEC_ID_PCM_MULAW:
363 if (payload_type >= RTP_PT_PRIVATE)
364 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
366 c->sample_rate, c->channels);
368 case CODEC_ID_PCM_ALAW:
369 if (payload_type >= RTP_PT_PRIVATE)
370 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
372 c->sample_rate, c->channels);
374 case CODEC_ID_AMR_NB:
375 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
376 "a=fmtp:%d octet-align=1\r\n",
377 payload_type, c->sample_rate, c->channels,
380 case CODEC_ID_AMR_WB:
381 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
382 "a=fmtp:%d octet-align=1\r\n",
383 payload_type, c->sample_rate, c->channels,
386 case CODEC_ID_VORBIS:
387 if (c->extradata_size)
388 config = xiph_extradata2config(c);
390 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
394 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
395 "a=fmtp:%d configuration=%s\r\n",
396 payload_type, c->sample_rate, c->channels,
397 payload_type, config);
399 case CODEC_ID_THEORA: {
401 if (c->extradata_size)
402 config = xiph_extradata2config(c);
404 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
408 switch (c->pix_fmt) {
409 case PIX_FMT_YUV420P:
410 pix_fmt = "YCbCr-4:2:0";
412 case PIX_FMT_YUV422P:
413 pix_fmt = "YCbCr-4:2:2";
415 case PIX_FMT_YUV444P:
416 pix_fmt = "YCbCr-4:4:4";
419 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
423 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
424 "a=fmtp:%d delivery-method=inline; "
425 "width=%d; height=%d; sampling=%s; "
426 "configuration=%s\r\n",
427 payload_type, payload_type,
428 c->width, c->height, pix_fmt, config);
432 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
435 case CODEC_ID_ADPCM_G722:
436 if (payload_type >= RTP_PT_PRIVATE)
437 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
442 /* Nothing special to do here... */
451 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)
456 payload_type = ff_rtp_get_payload_type(c);
457 if (payload_type < 0) {
458 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
461 switch (c->codec_type) {
462 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
463 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
464 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
465 default : type = "application"; break;
468 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
469 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
471 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
474 sdp_write_media_attributes(buff, size, c, payload_type);
477 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
479 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
480 struct sdp_session_level s;
481 int i, j, port, ttl, is_multicast;
482 char dst[32], dst_type[5];
484 memset(buff, 0, size);
485 memset(&s, 0, sizeof(struct sdp_session_level));
487 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
489 s.name = title ? title->value : "No Name";
494 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
495 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
501 s.dst_type = dst_type;
503 if (!strcmp(dst_type, "IP6")) {
509 sdp_write_header(buff, size, &s);
512 for (i = 0; i < n_files; i++) {
514 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
515 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
520 for (j = 0; j < ac[i]->nb_streams; j++) {
521 ff_sdp_write_media(buff, size,
522 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
523 dst_type, (port > 0) ? port + j * 2 : 0, ttl);
525 av_strlcatf(buff, size,
526 "a=control:streamid=%d\r\n", i + j);
534 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
536 return AVERROR(ENOSYS);
539 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)