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 = { 0 }, *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 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
103 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
104 NULL, 0, NI_NUMERICHOST);
106 if (ai->ai_family == AF_INET6)
107 av_strlcpy(type, "IP6", type_size);
109 is_multicast = ff_is_multicast_address(ai->ai_addr);
114 static int resolve_destination(char *dest_addr, int size, char *type,
121 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
127 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
131 if (strcmp(proto, "rtp")) {
132 /* The url isn't for the actual rtp sessions,
133 * don't parse out anything else than the destination.
138 p = strchr(url, '?');
142 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
143 *ttl = strtol(buff, NULL, 10);
152 #define MAX_PSET_SIZE 1024
153 static char *extradata2psets(AVCodecContext *c)
157 static const char pset_string[] = "; sprop-parameter-sets=";
158 static const char profile_string[] = "; profile-level-id=";
159 uint8_t *orig_extradata = NULL;
160 int orig_extradata_size = 0;
161 const uint8_t *sps = NULL, *sps_end;
163 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
164 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
168 if (c->extradata[0] == 1) {
171 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
174 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
179 orig_extradata_size = c->extradata_size;
180 orig_extradata = av_mallocz(orig_extradata_size +
181 FF_INPUT_BUFFER_PADDING_SIZE);
182 if (!orig_extradata) {
183 av_bitstream_filter_close(bsfc);
186 memcpy(orig_extradata, c->extradata, orig_extradata_size);
187 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
188 av_bitstream_filter_close(bsfc);
191 psets = av_mallocz(MAX_PSET_SIZE);
193 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
194 av_free(orig_extradata);
197 memcpy(psets, pset_string, strlen(pset_string));
198 p = psets + strlen(pset_string);
199 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
200 while (r < c->extradata + c->extradata_size) {
205 nal_type = *r & 0x1f;
206 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
207 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
211 if (p != (psets + strlen(pset_string))) {
219 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
220 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
228 if (sps && sps_end - sps >= 4) {
229 memcpy(p, profile_string, strlen(profile_string));
231 ff_data_to_hex(p, sps + 1, 3, 0);
234 if (orig_extradata) {
235 av_free(c->extradata);
236 c->extradata = orig_extradata;
237 c->extradata_size = orig_extradata_size;
243 static char *extradata2config(AVCodecContext *c)
247 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
248 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
252 config = av_malloc(10 + c->extradata_size * 2);
253 if (config == NULL) {
254 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
257 memcpy(config, "; config=", 9);
258 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
259 config[9 + c->extradata_size * 2] = 0;
264 static char *xiph_extradata2config(AVCodecContext *c)
266 char *config, *encoded_config;
267 uint8_t *header_start[3];
268 int headers_len, header_len[3], config_len;
269 int first_header_size;
271 switch (c->codec_id) {
272 case AV_CODEC_ID_THEORA:
273 first_header_size = 42;
275 case AV_CODEC_ID_VORBIS:
276 first_header_size = 30;
279 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
283 if (avpriv_split_xiph_headers(c->extradata, c->extradata_size,
284 first_header_size, header_start,
286 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
290 headers_len = header_len[0] + header_len[2];
291 config_len = 4 + // count
296 headers_len; // and the rest
298 config = av_malloc(config_len);
302 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
303 if (!encoded_config) {
308 config[0] = config[1] = config[2] = 0;
310 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
311 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
312 config[6] = (RTP_XIPH_IDENT ) & 0xff;
313 config[7] = (headers_len >> 8) & 0xff;
314 config[8] = headers_len & 0xff;
316 config[10] = header_len[0];
317 config[11] = 0; // size of comment header; nonexistent
318 memcpy(config + 12, header_start[0], header_len[0]);
319 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
321 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
325 return encoded_config;
328 av_log(c, AV_LOG_ERROR,
329 "Not enough memory for configuration string\n");
333 static int latm_context2profilelevel(AVCodecContext *c)
336 * The RTP payload format specification is described in RFC 3016
337 * The encoding specifications are provided in ISO/IEC 14496-3 */
339 int profile_level = 0x2B;
341 /* TODO: AAC Profile only supports AAC LC Object Type.
342 * Different Object Types should implement different Profile Levels */
344 if (c->sample_rate <= 24000) {
345 if (c->channels <= 2)
346 profile_level = 0x28; // AAC Profile, Level 1
347 } else if (c->sample_rate <= 48000) {
348 if (c->channels <= 2) {
349 profile_level = 0x29; // AAC Profile, Level 2
350 } else if (c->channels <= 5) {
351 profile_level = 0x2A; // AAC Profile, Level 4
353 } else if (c->sample_rate <= 96000) {
354 if (c->channels <= 5) {
355 profile_level = 0x2B; // AAC Profile, Level 5
359 return profile_level;
362 static char *latm_context2config(AVCodecContext *c)
365 * The RTP payload format specification is described in RFC 3016
366 * The encoding specifications are provided in ISO/IEC 14496-3 */
368 uint8_t config_byte[6];
372 for (rate_index = 0; rate_index < 16; rate_index++)
373 if (avpriv_mpeg4audio_sample_rates[rate_index] == c->sample_rate)
375 if (rate_index == 16) {
376 av_log(c, AV_LOG_ERROR, "Unsupported sample rate\n");
380 config_byte[0] = 0x40;
382 config_byte[2] = 0x20 | rate_index;
383 config_byte[3] = c->channels << 4;
384 config_byte[4] = 0x3f;
385 config_byte[5] = 0xc0;
387 config = av_malloc(6*2+1);
389 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
392 ff_data_to_hex(config, config_byte, 6, 1);
398 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type, AVFormatContext *fmt)
402 switch (c->codec_id) {
403 case AV_CODEC_ID_H264: {
405 if (fmt && fmt->oformat->priv_class &&
406 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0"))
408 if (c->extradata_size) {
409 config = extradata2psets(c);
411 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
412 "a=fmtp:%d packetization-mode=%d%s\r\n",
414 payload_type, mode, config ? config : "");
417 case AV_CODEC_ID_H263:
418 case AV_CODEC_ID_H263P:
419 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
420 * actually specifies the maximum video size, but we only know
421 * the current size. This is required for playback on Android
422 * stagefright and on Samsung bada. */
423 if (!fmt || !fmt->oformat->priv_class ||
424 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") ||
425 c->codec_id == AV_CODEC_ID_H263P)
426 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
427 "a=framesize:%d %d-%d\r\n",
429 payload_type, c->width, c->height);
431 case AV_CODEC_ID_MPEG4:
432 if (c->extradata_size) {
433 config = extradata2config(c);
435 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
436 "a=fmtp:%d profile-level-id=1%s\r\n",
438 payload_type, config ? config : "");
440 case AV_CODEC_ID_AAC:
441 if (fmt && fmt->oformat && fmt->oformat->priv_class &&
442 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
443 config = latm_context2config(c);
446 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
447 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
448 payload_type, c->sample_rate, c->channels,
449 payload_type, latm_context2profilelevel(c), config);
451 if (c->extradata_size) {
452 config = extradata2config(c);
454 /* FIXME: maybe we can forge config information based on the
455 * codec parameters...
457 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
460 if (config == NULL) {
463 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
464 "a=fmtp:%d profile-level-id=1;"
465 "mode=AAC-hbr;sizelength=13;indexlength=3;"
466 "indexdeltalength=3%s\r\n",
467 payload_type, c->sample_rate, c->channels,
468 payload_type, config);
471 case AV_CODEC_ID_PCM_S16BE:
472 if (payload_type >= RTP_PT_PRIVATE)
473 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
475 c->sample_rate, c->channels);
477 case AV_CODEC_ID_PCM_MULAW:
478 if (payload_type >= RTP_PT_PRIVATE)
479 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
481 c->sample_rate, c->channels);
483 case AV_CODEC_ID_PCM_ALAW:
484 if (payload_type >= RTP_PT_PRIVATE)
485 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
487 c->sample_rate, c->channels);
489 case AV_CODEC_ID_AMR_NB:
490 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
491 "a=fmtp:%d octet-align=1\r\n",
492 payload_type, c->sample_rate, c->channels,
495 case AV_CODEC_ID_AMR_WB:
496 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
497 "a=fmtp:%d octet-align=1\r\n",
498 payload_type, c->sample_rate, c->channels,
501 case AV_CODEC_ID_VORBIS:
502 if (c->extradata_size)
503 config = xiph_extradata2config(c);
505 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
509 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
510 "a=fmtp:%d configuration=%s\r\n",
511 payload_type, c->sample_rate, c->channels,
512 payload_type, config);
514 case AV_CODEC_ID_THEORA: {
516 if (c->extradata_size)
517 config = xiph_extradata2config(c);
519 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
523 switch (c->pix_fmt) {
524 case AV_PIX_FMT_YUV420P:
525 pix_fmt = "YCbCr-4:2:0";
527 case AV_PIX_FMT_YUV422P:
528 pix_fmt = "YCbCr-4:2:2";
530 case AV_PIX_FMT_YUV444P:
531 pix_fmt = "YCbCr-4:4:4";
534 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
538 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
539 "a=fmtp:%d delivery-method=inline; "
540 "width=%d; height=%d; sampling=%s; "
541 "configuration=%s\r\n",
542 payload_type, payload_type,
543 c->width, c->height, pix_fmt, config);
546 case AV_CODEC_ID_VP8:
547 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
550 case AV_CODEC_ID_MJPEG:
551 if (payload_type >= RTP_PT_PRIVATE)
552 av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n",
555 case AV_CODEC_ID_ADPCM_G722:
556 if (payload_type >= RTP_PT_PRIVATE)
557 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
561 case AV_CODEC_ID_ADPCM_G726: {
562 if (payload_type >= RTP_PT_PRIVATE)
563 av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n",
565 c->bits_per_coded_sample*8,
569 case AV_CODEC_ID_ILBC:
570 av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n"
571 "a=fmtp:%d mode=%d\r\n",
572 payload_type, c->sample_rate,
573 payload_type, c->block_align == 38 ? 20 : 30);
575 case AV_CODEC_ID_SPEEX:
576 av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n",
577 payload_type, c->sample_rate);
579 case AV_CODEC_ID_OPUS:
580 av_strlcatf(buff, size, "a=rtpmap:%d opus/48000\r\n",
584 /* Nothing special to do here... */
593 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)
598 payload_type = ff_rtp_get_payload_type(fmt, c);
600 switch (c->codec_type) {
601 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
602 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
603 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
604 default : type = "application"; break;
607 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
608 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
610 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
613 sdp_write_media_attributes(buff, size, c, payload_type, fmt);
616 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
618 AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
619 struct sdp_session_level s = { 0 };
620 int i, j, port, ttl, is_multicast;
621 char dst[32], dst_type[5];
623 memset(buf, 0, size);
625 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
627 s.name = title ? title->value : "No Name";
632 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
633 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
639 s.dst_type = dst_type;
641 if (!strcmp(dst_type, "IP6")) {
647 sdp_write_header(buf, size, &s);
650 for (i = 0; i < n_files; i++) {
652 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
653 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
658 for (j = 0; j < ac[i]->nb_streams; j++) {
659 ff_sdp_write_media(buf, size,
660 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
661 dst_type, (port > 0) ? port + j * 2 : 0, ttl,
664 av_strlcatf(buf, size,
665 "a=control:streamid=%d\r\n", i + j);
673 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
675 return AVERROR(ENOSYS);
678 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)