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/dict.h"
25 #include "libavutil/parseutils.h"
26 #include "libavutil/opt.h"
27 #include "libavcodec/xiph.h"
28 #include "libavcodec/mpeg4audio.h"
38 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
40 struct sdp_session_level {
41 int sdp_version; /**< protocol version (currently 0) */
42 int id; /**< session ID */
43 int version; /**< session version */
44 int start_time; /**< session start time (NTP time, in seconds),
45 or 0 in case of permanent session */
46 int end_time; /**< session end time (NTP time, in seconds),
47 or 0 if the session is not bounded */
48 int ttl; /**< TTL, in case of multicast stream */
49 const char *user; /**< username of the session's creator */
50 const char *src_addr; /**< IP address of the machine from which the session was created */
51 const char *src_type; /**< address type of src_addr */
52 const char *dst_addr; /**< destination IP address (can be multicast) */
53 const char *dst_type; /**< destination IP address type */
54 const char *name; /**< session name (can be an empty string) */
57 static void sdp_write_address(char *buff, int size, const char *dest_addr,
58 const char *dest_type, int ttl)
63 if (ttl > 0 && !strcmp(dest_type, "IP4")) {
64 /* The TTL should only be specified for IPv4 multicast addresses,
66 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
68 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
73 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
75 av_strlcatf(buff, size, "v=%d\r\n"
76 "o=- %d %d IN %s %s\r\n"
79 s->id, s->version, s->src_type, s->src_addr,
81 sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
82 av_strlcatf(buff, size, "t=%d %d\r\n"
83 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
84 s->start_time, s->end_time);
88 static int resolve_destination(char *dest_addr, int size, char *type,
91 struct addrinfo hints, *ai;
94 av_strlcpy(type, "IP4", type_size);
98 /* Resolve the destination, since it must be written
99 * as a numeric IP address in the SDP. */
101 memset(&hints, 0, sizeof(hints));
102 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
104 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
105 NULL, 0, NI_NUMERICHOST);
107 if (ai->ai_family == AF_INET6)
108 av_strlcpy(type, "IP6", type_size);
110 is_multicast = ff_is_multicast_address(ai->ai_addr);
115 static int resolve_destination(char *dest_addr, int size, char *type,
122 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
128 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
132 if (strcmp(proto, "rtp")) {
133 /* The url isn't for the actual rtp sessions,
134 * don't parse out anything else than the destination.
139 p = strchr(url, '?');
143 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
144 *ttl = strtol(buff, NULL, 10);
153 #define MAX_PSET_SIZE 1024
154 static char *extradata2psets(AVCodecContext *c)
158 const char *pset_string = "; sprop-parameter-sets=";
160 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
161 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
165 if (c->extradata[0] == 1) {
168 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
171 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
175 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
176 av_bitstream_filter_close(bsfc);
179 psets = av_mallocz(MAX_PSET_SIZE);
181 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
184 memcpy(psets, pset_string, strlen(pset_string));
185 p = psets + strlen(pset_string);
186 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
187 while (r < c->extradata + c->extradata_size) {
192 nal_type = *r & 0x1f;
193 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
194 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
198 if (p != (psets + strlen(pset_string))) {
202 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
203 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
215 static char *extradata2config(AVCodecContext *c)
219 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
220 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
224 config = av_malloc(10 + c->extradata_size * 2);
225 if (config == NULL) {
226 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
229 memcpy(config, "; config=", 9);
230 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
231 config[9 + c->extradata_size * 2] = 0;
236 static char *xiph_extradata2config(AVCodecContext *c)
238 char *config, *encoded_config;
239 uint8_t *header_start[3];
240 int headers_len, header_len[3], config_len;
241 int first_header_size;
243 switch (c->codec_id) {
244 case CODEC_ID_THEORA:
245 first_header_size = 42;
247 case CODEC_ID_VORBIS:
248 first_header_size = 30;
251 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
255 if (ff_split_xiph_headers(c->extradata, c->extradata_size,
256 first_header_size, header_start,
258 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
262 headers_len = header_len[0] + header_len[2];
263 config_len = 4 + // count
268 headers_len; // and the rest
270 config = av_malloc(config_len);
274 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
275 if (!encoded_config) {
280 config[0] = config[1] = config[2] = 0;
282 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
283 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
284 config[6] = (RTP_XIPH_IDENT ) & 0xff;
285 config[7] = (headers_len >> 8) & 0xff;
286 config[8] = headers_len & 0xff;
288 config[10] = header_len[0];
289 config[11] = 0; // size of comment header; nonexistent
290 memcpy(config + 12, header_start[0], header_len[0]);
291 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
293 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
297 return encoded_config;
300 av_log(c, AV_LOG_ERROR,
301 "Not enough memory for configuration string\n");
305 static int latm_context2profilelevel(AVCodecContext *c)
308 * The RTP payload format specification is described in RFC 3016
309 * The encoding specifications are provided in ISO/IEC 14496-3 */
311 int profile_level = 0x2B;
313 /* TODO: AAC Profile only supports AAC LC Object Type.
314 * Different Object Types should implement different Profile Levels */
316 if (c->sample_rate <= 24000) {
317 if (c->channels <= 2)
318 profile_level = 0x28; // AAC Profile, Level 1
319 } else if (c->sample_rate <= 48000) {
320 if (c->channels <= 2) {
321 profile_level = 0x29; // AAC Profile, Level 2
322 } else if (c->channels <= 5) {
323 profile_level = 0x2A; // AAC Profile, Level 4
325 } else if (c->sample_rate <= 96000) {
326 if (c->channels <= 5) {
327 profile_level = 0x2B; // AAC Profile, Level 5
331 return profile_level;
334 static char *latm_context2config(AVCodecContext *c)
337 * The RTP payload format specification is described in RFC 3016
338 * The encoding specifications are provided in ISO/IEC 14496-3 */
340 uint8_t config_byte[6];
344 for (rate_index = 0; rate_index < 16; rate_index++)
345 if (ff_mpeg4audio_sample_rates[rate_index] == c->sample_rate)
347 if (rate_index == 16) {
348 av_log(c, AV_LOG_ERROR, "Unsupported sample rate\n");
352 config_byte[0] = 0x40;
354 config_byte[2] = 0x20 | rate_index;
355 config_byte[3] = c->channels << 4;
356 config_byte[4] = 0x3f;
357 config_byte[5] = 0xc0;
359 config = av_malloc(6*2+1);
361 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
364 ff_data_to_hex(config, config_byte, 6, 1);
370 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type, AVFormatContext *fmt)
374 switch (c->codec_id) {
376 if (c->extradata_size) {
377 config = extradata2psets(c);
379 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
380 "a=fmtp:%d packetization-mode=1%s\r\n",
382 payload_type, config ? config : "");
386 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
387 * actually specifies the maximum video size, but we only know
388 * the current size. This is required for playback on Android
389 * stagefright and on Samsung bada. */
390 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
391 "a=framesize:%d %d-%d\r\n",
393 payload_type, c->width, c->height);
396 if (c->extradata_size) {
397 config = extradata2config(c);
399 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
400 "a=fmtp:%d profile-level-id=1%s\r\n",
402 payload_type, config ? config : "");
405 if (fmt && fmt->oformat->priv_class &&
406 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
407 config = latm_context2config(c);
410 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
411 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
412 payload_type, c->sample_rate, c->channels,
413 payload_type, latm_context2profilelevel(c), config);
415 if (c->extradata_size) {
416 config = extradata2config(c);
418 /* FIXME: maybe we can forge config information based on the
419 * codec parameters...
421 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
424 if (config == NULL) {
427 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
428 "a=fmtp:%d profile-level-id=1;"
429 "mode=AAC-hbr;sizelength=13;indexlength=3;"
430 "indexdeltalength=3%s\r\n",
431 payload_type, c->sample_rate, c->channels,
432 payload_type, config);
435 case CODEC_ID_PCM_S16BE:
436 if (payload_type >= RTP_PT_PRIVATE)
437 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
439 c->sample_rate, c->channels);
441 case CODEC_ID_PCM_MULAW:
442 if (payload_type >= RTP_PT_PRIVATE)
443 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
445 c->sample_rate, c->channels);
447 case CODEC_ID_PCM_ALAW:
448 if (payload_type >= RTP_PT_PRIVATE)
449 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
451 c->sample_rate, c->channels);
453 case CODEC_ID_AMR_NB:
454 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
455 "a=fmtp:%d octet-align=1\r\n",
456 payload_type, c->sample_rate, c->channels,
459 case CODEC_ID_AMR_WB:
460 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
461 "a=fmtp:%d octet-align=1\r\n",
462 payload_type, c->sample_rate, c->channels,
465 case CODEC_ID_VORBIS:
466 if (c->extradata_size)
467 config = xiph_extradata2config(c);
469 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
473 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
474 "a=fmtp:%d configuration=%s\r\n",
475 payload_type, c->sample_rate, c->channels,
476 payload_type, config);
478 case CODEC_ID_THEORA: {
480 if (c->extradata_size)
481 config = xiph_extradata2config(c);
483 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
487 switch (c->pix_fmt) {
488 case PIX_FMT_YUV420P:
489 pix_fmt = "YCbCr-4:2:0";
491 case PIX_FMT_YUV422P:
492 pix_fmt = "YCbCr-4:2:2";
494 case PIX_FMT_YUV444P:
495 pix_fmt = "YCbCr-4:4:4";
498 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
502 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
503 "a=fmtp:%d delivery-method=inline; "
504 "width=%d; height=%d; sampling=%s; "
505 "configuration=%s\r\n",
506 payload_type, payload_type,
507 c->width, c->height, pix_fmt, config);
511 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
514 case CODEC_ID_ADPCM_G722:
515 if (payload_type >= RTP_PT_PRIVATE)
516 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
521 /* Nothing special to do here... */
530 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)
535 payload_type = ff_rtp_get_payload_type(c);
536 if (payload_type < 0) {
537 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
540 switch (c->codec_type) {
541 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
542 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
543 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
544 default : type = "application"; break;
547 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
548 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
550 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
553 sdp_write_media_attributes(buff, size, c, payload_type, fmt);
556 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
558 AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
559 struct sdp_session_level s;
560 int i, j, port, ttl, is_multicast;
561 char dst[32], dst_type[5];
563 memset(buf, 0, size);
564 memset(&s, 0, sizeof(struct sdp_session_level));
566 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
568 s.name = title ? title->value : "No Name";
573 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
574 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
580 s.dst_type = dst_type;
582 if (!strcmp(dst_type, "IP6")) {
588 sdp_write_header(buf, size, &s);
591 for (i = 0; i < n_files; i++) {
593 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
594 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
599 for (j = 0; j < ac[i]->nb_streams; j++) {
600 ff_sdp_write_media(buf, size,
601 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
602 dst_type, (port > 0) ? port + j * 2 : 0, ttl,
605 av_strlcatf(buf, size,
606 "a=control:streamid=%d\r\n", i + j);
614 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
616 return AVERROR(ENOSYS);
619 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)
624 #if FF_API_SDP_CREATE
625 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
627 return av_sdp_create(ac, n_files, buff, size);