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 const char *pset_string = "; sprop-parameter-sets=";
158 uint8_t *orig_extradata = NULL;
159 int orig_extradata_size = 0;
161 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
162 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
166 if (c->extradata[0] == 1) {
169 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
172 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
177 orig_extradata_size = c->extradata_size;
178 orig_extradata = av_mallocz(orig_extradata_size +
179 FF_INPUT_BUFFER_PADDING_SIZE);
180 if (!orig_extradata) {
181 av_bitstream_filter_close(bsfc);
184 memcpy(orig_extradata, c->extradata, orig_extradata_size);
185 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
186 av_bitstream_filter_close(bsfc);
189 psets = av_mallocz(MAX_PSET_SIZE);
191 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
192 av_free(orig_extradata);
195 memcpy(psets, pset_string, strlen(pset_string));
196 p = psets + strlen(pset_string);
197 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
198 while (r < c->extradata + c->extradata_size) {
203 nal_type = *r & 0x1f;
204 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
205 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
209 if (p != (psets + strlen(pset_string))) {
213 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
214 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
222 if (orig_extradata) {
223 av_free(c->extradata);
224 c->extradata = orig_extradata;
225 c->extradata_size = orig_extradata_size;
231 static char *extradata2config(AVCodecContext *c)
235 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
236 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
240 config = av_malloc(10 + c->extradata_size * 2);
241 if (config == NULL) {
242 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
245 memcpy(config, "; config=", 9);
246 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
247 config[9 + c->extradata_size * 2] = 0;
252 static char *xiph_extradata2config(AVCodecContext *c)
254 char *config, *encoded_config;
255 uint8_t *header_start[3];
256 int headers_len, header_len[3], config_len;
257 int first_header_size;
259 switch (c->codec_id) {
260 case CODEC_ID_THEORA:
261 first_header_size = 42;
263 case CODEC_ID_VORBIS:
264 first_header_size = 30;
267 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
271 if (avpriv_split_xiph_headers(c->extradata, c->extradata_size,
272 first_header_size, header_start,
274 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
278 headers_len = header_len[0] + header_len[2];
279 config_len = 4 + // count
284 headers_len; // and the rest
286 config = av_malloc(config_len);
290 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
291 if (!encoded_config) {
296 config[0] = config[1] = config[2] = 0;
298 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
299 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
300 config[6] = (RTP_XIPH_IDENT ) & 0xff;
301 config[7] = (headers_len >> 8) & 0xff;
302 config[8] = headers_len & 0xff;
304 config[10] = header_len[0];
305 config[11] = 0; // size of comment header; nonexistent
306 memcpy(config + 12, header_start[0], header_len[0]);
307 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
309 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
313 return encoded_config;
316 av_log(c, AV_LOG_ERROR,
317 "Not enough memory for configuration string\n");
321 static int latm_context2profilelevel(AVCodecContext *c)
324 * The RTP payload format specification is described in RFC 3016
325 * The encoding specifications are provided in ISO/IEC 14496-3 */
327 int profile_level = 0x2B;
329 /* TODO: AAC Profile only supports AAC LC Object Type.
330 * Different Object Types should implement different Profile Levels */
332 if (c->sample_rate <= 24000) {
333 if (c->channels <= 2)
334 profile_level = 0x28; // AAC Profile, Level 1
335 } else if (c->sample_rate <= 48000) {
336 if (c->channels <= 2) {
337 profile_level = 0x29; // AAC Profile, Level 2
338 } else if (c->channels <= 5) {
339 profile_level = 0x2A; // AAC Profile, Level 4
341 } else if (c->sample_rate <= 96000) {
342 if (c->channels <= 5) {
343 profile_level = 0x2B; // AAC Profile, Level 5
347 return profile_level;
350 static char *latm_context2config(AVCodecContext *c)
353 * The RTP payload format specification is described in RFC 3016
354 * The encoding specifications are provided in ISO/IEC 14496-3 */
356 uint8_t config_byte[6];
360 for (rate_index = 0; rate_index < 16; rate_index++)
361 if (avpriv_mpeg4audio_sample_rates[rate_index] == c->sample_rate)
363 if (rate_index == 16) {
364 av_log(c, AV_LOG_ERROR, "Unsupported sample rate\n");
368 config_byte[0] = 0x40;
370 config_byte[2] = 0x20 | rate_index;
371 config_byte[3] = c->channels << 4;
372 config_byte[4] = 0x3f;
373 config_byte[5] = 0xc0;
375 config = av_malloc(6*2+1);
377 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
380 ff_data_to_hex(config, config_byte, 6, 1);
386 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type, AVFormatContext *fmt)
390 switch (c->codec_id) {
391 case CODEC_ID_H264: {
393 if (fmt && fmt->oformat->priv_class &&
394 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0"))
396 if (c->extradata_size) {
397 config = extradata2psets(c);
399 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
400 "a=fmtp:%d packetization-mode=%d%s\r\n",
402 payload_type, mode, config ? config : "");
407 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
408 * actually specifies the maximum video size, but we only know
409 * the current size. This is required for playback on Android
410 * stagefright and on Samsung bada. */
411 if (!fmt || !fmt->oformat->priv_class ||
412 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") ||
413 c->codec_id == CODEC_ID_H263P)
414 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
415 "a=framesize:%d %d-%d\r\n",
417 payload_type, c->width, c->height);
420 if (c->extradata_size) {
421 config = extradata2config(c);
423 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
424 "a=fmtp:%d profile-level-id=1%s\r\n",
426 payload_type, config ? config : "");
429 if (fmt && fmt->oformat && fmt->oformat->priv_class &&
430 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
431 config = latm_context2config(c);
434 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
435 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
436 payload_type, c->sample_rate, c->channels,
437 payload_type, latm_context2profilelevel(c), config);
439 if (c->extradata_size) {
440 config = extradata2config(c);
442 /* FIXME: maybe we can forge config information based on the
443 * codec parameters...
445 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
448 if (config == NULL) {
451 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
452 "a=fmtp:%d profile-level-id=1;"
453 "mode=AAC-hbr;sizelength=13;indexlength=3;"
454 "indexdeltalength=3%s\r\n",
455 payload_type, c->sample_rate, c->channels,
456 payload_type, config);
459 case CODEC_ID_PCM_S16BE:
460 if (payload_type >= RTP_PT_PRIVATE)
461 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
463 c->sample_rate, c->channels);
465 case CODEC_ID_PCM_MULAW:
466 if (payload_type >= RTP_PT_PRIVATE)
467 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
469 c->sample_rate, c->channels);
471 case CODEC_ID_PCM_ALAW:
472 if (payload_type >= RTP_PT_PRIVATE)
473 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
475 c->sample_rate, c->channels);
477 case CODEC_ID_AMR_NB:
478 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
479 "a=fmtp:%d octet-align=1\r\n",
480 payload_type, c->sample_rate, c->channels,
483 case CODEC_ID_AMR_WB:
484 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
485 "a=fmtp:%d octet-align=1\r\n",
486 payload_type, c->sample_rate, c->channels,
489 case CODEC_ID_VORBIS:
490 if (c->extradata_size)
491 config = xiph_extradata2config(c);
493 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
497 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
498 "a=fmtp:%d configuration=%s\r\n",
499 payload_type, c->sample_rate, c->channels,
500 payload_type, config);
502 case CODEC_ID_THEORA: {
504 if (c->extradata_size)
505 config = xiph_extradata2config(c);
507 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
511 switch (c->pix_fmt) {
512 case PIX_FMT_YUV420P:
513 pix_fmt = "YCbCr-4:2:0";
515 case PIX_FMT_YUV422P:
516 pix_fmt = "YCbCr-4:2:2";
518 case PIX_FMT_YUV444P:
519 pix_fmt = "YCbCr-4:4:4";
522 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
526 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
527 "a=fmtp:%d delivery-method=inline; "
528 "width=%d; height=%d; sampling=%s; "
529 "configuration=%s\r\n",
530 payload_type, payload_type,
531 c->width, c->height, pix_fmt, config);
535 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
538 case CODEC_ID_ADPCM_G722:
539 if (payload_type >= RTP_PT_PRIVATE)
540 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
544 case CODEC_ID_ADPCM_G726: {
545 if (payload_type >= RTP_PT_PRIVATE)
546 av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n",
548 c->bits_per_coded_sample*8,
553 av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n"
554 "a=fmtp:%d mode=%d\r\n",
555 payload_type, c->sample_rate,
556 payload_type, c->block_align == 38 ? 20 : 30);
559 /* Nothing special to do here... */
568 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)
573 payload_type = ff_rtp_get_payload_type(fmt, c);
575 switch (c->codec_type) {
576 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
577 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
578 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
579 default : type = "application"; break;
582 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
583 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
585 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
588 sdp_write_media_attributes(buff, size, c, payload_type, fmt);
591 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
593 AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
594 struct sdp_session_level s = { 0 };
595 int i, j, port, ttl, is_multicast;
596 char dst[32], dst_type[5];
598 memset(buf, 0, size);
600 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
602 s.name = title ? title->value : "No Name";
607 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
608 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
614 s.dst_type = dst_type;
616 if (!strcmp(dst_type, "IP6")) {
622 sdp_write_header(buf, size, &s);
625 for (i = 0; i < n_files; i++) {
627 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
628 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
633 for (j = 0; j < ac[i]->nb_streams; j++) {
634 ff_sdp_write_media(buf, size,
635 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
636 dst_type, (port > 0) ? port + j * 2 : 0, ttl,
639 av_strlcatf(buf, size,
640 "a=control:streamid=%d\r\n", i + j);
648 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
650 return AVERROR(ENOSYS);
653 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)