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"
26 #include "libavcodec/mpeg4audio.h"
36 #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
38 struct sdp_session_level {
39 int sdp_version; /**< protocol version (currently 0) */
40 int id; /**< session ID */
41 int version; /**< session version */
42 int start_time; /**< session start time (NTP time, in seconds),
43 or 0 in case of permanent session */
44 int end_time; /**< session end time (NTP time, in seconds),
45 or 0 if the session is not bounded */
46 int ttl; /**< TTL, in case of multicast stream */
47 const char *user; /**< username of the session's creator */
48 const char *src_addr; /**< IP address of the machine from which the session was created */
49 const char *src_type; /**< address type of src_addr */
50 const char *dst_addr; /**< destination IP address (can be multicast) */
51 const char *dst_type; /**< destination IP address type */
52 const char *name; /**< session name (can be an empty string) */
55 static void sdp_write_address(char *buff, int size, const char *dest_addr,
56 const char *dest_type, int ttl)
61 if (ttl > 0 && !strcmp(dest_type, "IP4")) {
62 /* The TTL should only be specified for IPv4 multicast addresses,
64 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
66 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
71 static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
73 av_strlcatf(buff, size, "v=%d\r\n"
74 "o=- %d %d IN %s %s\r\n"
77 s->id, s->version, s->src_type, s->src_addr,
79 sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
80 av_strlcatf(buff, size, "t=%d %d\r\n"
81 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
82 s->start_time, s->end_time);
86 static int resolve_destination(char *dest_addr, int size, char *type,
89 struct addrinfo hints, *ai;
92 av_strlcpy(type, "IP4", type_size);
96 /* Resolve the destination, since it must be written
97 * as a numeric IP address in the SDP. */
99 memset(&hints, 0, sizeof(hints));
100 if (getaddrinfo(dest_addr, NULL, &hints, &ai))
102 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
103 NULL, 0, NI_NUMERICHOST);
105 if (ai->ai_family == AF_INET6)
106 av_strlcpy(type, "IP6", type_size);
108 is_multicast = ff_is_multicast_address(ai->ai_addr);
113 static int resolve_destination(char *dest_addr, int size, char *type,
120 static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
126 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
130 if (strcmp(proto, "rtp")) {
131 /* The url isn't for the actual rtp sessions,
132 * don't parse out anything else than the destination.
137 p = strchr(url, '?');
141 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
142 *ttl = strtol(buff, NULL, 10);
151 #define MAX_PSET_SIZE 1024
152 static char *extradata2psets(AVCodecContext *c)
156 const char *pset_string = "; sprop-parameter-sets=";
158 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
159 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
163 if (c->extradata[0] == 1) {
166 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
169 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
173 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
174 av_bitstream_filter_close(bsfc);
177 psets = av_mallocz(MAX_PSET_SIZE);
179 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
182 memcpy(psets, pset_string, strlen(pset_string));
183 p = psets + strlen(pset_string);
184 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
185 while (r < c->extradata + c->extradata_size) {
190 nal_type = *r & 0x1f;
191 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
192 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
196 if (p != (psets + strlen(pset_string))) {
200 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
201 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
213 static char *extradata2config(AVCodecContext *c)
217 if (c->extradata_size > MAX_EXTRADATA_SIZE) {
218 av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
222 config = av_malloc(10 + c->extradata_size * 2);
223 if (config == NULL) {
224 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
227 memcpy(config, "; config=", 9);
228 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
229 config[9 + c->extradata_size * 2] = 0;
234 static char *xiph_extradata2config(AVCodecContext *c)
236 char *config, *encoded_config;
237 uint8_t *header_start[3];
238 int headers_len, header_len[3], config_len;
239 int first_header_size;
241 switch (c->codec_id) {
242 case CODEC_ID_THEORA:
243 first_header_size = 42;
245 case CODEC_ID_VORBIS:
246 first_header_size = 30;
249 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
253 if (ff_split_xiph_headers(c->extradata, c->extradata_size,
254 first_header_size, header_start,
256 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
260 headers_len = header_len[0] + header_len[2];
261 config_len = 4 + // count
266 headers_len; // and the rest
268 config = av_malloc(config_len);
272 encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
273 if (!encoded_config) {
278 config[0] = config[1] = config[2] = 0;
280 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
281 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
282 config[6] = (RTP_XIPH_IDENT ) & 0xff;
283 config[7] = (headers_len >> 8) & 0xff;
284 config[8] = headers_len & 0xff;
286 config[10] = header_len[0];
287 config[11] = 0; // size of comment header; nonexistent
288 memcpy(config + 12, header_start[0], header_len[0]);
289 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
291 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
295 return encoded_config;
298 av_log(c, AV_LOG_ERROR,
299 "Not enough memory for configuration string\n");
303 static int latm_context2profilelevel(AVCodecContext *c) {
305 * The RTP payload format specification is described in RFC 3016
306 * The encoding specifications are provided in ISO/IEC 14496-3 */
308 int profile_level = 0x2B;
310 /* TODO: AAC Profile only supports AAC LC Object Type.
311 * Different Object Types should implement different Profile Levels */
313 if (c->sample_rate <= 24000) {
314 if (c->channels <= 2)
315 profile_level = 0x28; // AAC Profile, Level 1
316 } else if (c->sample_rate <= 48000) {
317 if (c->channels <= 2) {
318 profile_level = 0x29; // AAC Profile, Level 2
319 } else if (c->channels <= 5) {
320 profile_level = 0x2A; // AAC Profile, Level 4
322 } else if (c->sample_rate <= 96000) {
323 if (c->channels <= 5) {
324 profile_level = 0x2B; // AAC Profile, Level 5
328 return profile_level;
331 static char *latm_context2config(AVCodecContext *c) {
333 * The RTP payload format specification is described in RFC 3016
334 * The encoding specifications are provided in ISO/IEC 14496-3 */
336 uint8_t config_byte[6];
340 for (rate_index = 0; rate_index < 16; rate_index++)
341 if (ff_mpeg4audio_sample_rates[rate_index] == c->sample_rate)
343 if (rate_index == 16) {
344 av_log(c, AV_LOG_ERROR, "Unsupported sample rate\n");
348 config_byte[0] = 0x40;
350 config_byte[2] = 0x20 | rate_index;
351 config_byte[3] = c->channels << 4;
352 config_byte[4] = 0x3f;
353 config_byte[5] = 0xc0;
355 config = av_malloc(6*2+1);
357 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
360 ff_data_to_hex(config, config_byte, 6, 1);
366 static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type, int flags)
370 switch (c->codec_id) {
372 if (c->extradata_size) {
373 config = extradata2psets(c);
375 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
376 "a=fmtp:%d packetization-mode=1%s\r\n",
378 payload_type, config ? config : "");
382 /* a=framesize is required by 3GPP TS 26.234 (PSS). It
383 * actually specifies the maximum video size, but we only know
384 * the current size. This is required for playback on Android
385 * stagefright and on Samsung bada. */
386 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
387 "a=framesize:%d %d-%d\r\n",
389 payload_type, c->width, c->height);
392 if (c->extradata_size) {
393 config = extradata2config(c);
395 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
396 "a=fmtp:%d profile-level-id=1%s\r\n",
398 payload_type, config ? config : "");
401 if (flags & AVFMT_FLAG_MP4A_LATM) {
402 config = latm_context2config(c);
405 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
406 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
407 payload_type, c->sample_rate, c->channels,
408 payload_type, latm_context2profilelevel(c), config);
410 if (c->extradata_size) {
411 config = extradata2config(c);
413 /* FIXME: maybe we can forge config information based on the
414 * codec parameters...
416 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
419 if (config == NULL) {
422 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
423 "a=fmtp:%d profile-level-id=1;"
424 "mode=AAC-hbr;sizelength=13;indexlength=3;"
425 "indexdeltalength=3%s\r\n",
426 payload_type, c->sample_rate, c->channels,
427 payload_type, config);
430 case CODEC_ID_PCM_S16BE:
431 if (payload_type >= RTP_PT_PRIVATE)
432 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
434 c->sample_rate, c->channels);
436 case CODEC_ID_PCM_MULAW:
437 if (payload_type >= RTP_PT_PRIVATE)
438 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
440 c->sample_rate, c->channels);
442 case CODEC_ID_PCM_ALAW:
443 if (payload_type >= RTP_PT_PRIVATE)
444 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
446 c->sample_rate, c->channels);
448 case CODEC_ID_AMR_NB:
449 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
450 "a=fmtp:%d octet-align=1\r\n",
451 payload_type, c->sample_rate, c->channels,
454 case CODEC_ID_AMR_WB:
455 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
456 "a=fmtp:%d octet-align=1\r\n",
457 payload_type, c->sample_rate, c->channels,
460 case CODEC_ID_VORBIS:
461 if (c->extradata_size)
462 config = xiph_extradata2config(c);
464 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
468 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
469 "a=fmtp:%d configuration=%s\r\n",
470 payload_type, c->sample_rate, c->channels,
471 payload_type, config);
473 case CODEC_ID_THEORA: {
475 if (c->extradata_size)
476 config = xiph_extradata2config(c);
478 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
482 switch (c->pix_fmt) {
483 case PIX_FMT_YUV420P:
484 pix_fmt = "YCbCr-4:2:0";
486 case PIX_FMT_YUV422P:
487 pix_fmt = "YCbCr-4:2:2";
489 case PIX_FMT_YUV444P:
490 pix_fmt = "YCbCr-4:4:4";
493 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
497 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
498 "a=fmtp:%d delivery-method=inline; "
499 "width=%d; height=%d; sampling=%s; "
500 "configuration=%s\r\n",
501 payload_type, payload_type,
502 c->width, c->height, pix_fmt, config);
506 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
509 case CODEC_ID_ADPCM_G722:
510 if (payload_type >= RTP_PT_PRIVATE)
511 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
516 /* Nothing special to do here... */
525 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl, int flags)
530 payload_type = ff_rtp_get_payload_type(c);
531 if (payload_type < 0) {
532 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
535 switch (c->codec_type) {
536 case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
537 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
538 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
539 default : type = "application"; break;
542 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
543 sdp_write_address(buff, size, dest_addr, dest_type, ttl);
545 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
548 sdp_write_media_attributes(buff, size, c, payload_type, flags);
551 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
553 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
554 struct sdp_session_level s;
555 int i, j, port, ttl, is_multicast;
556 char dst[32], dst_type[5];
558 memset(buf, 0, size);
559 memset(&s, 0, sizeof(struct sdp_session_level));
561 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
563 s.name = title ? title->value : "No Name";
568 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
569 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
575 s.dst_type = dst_type;
577 if (!strcmp(dst_type, "IP6")) {
583 sdp_write_header(buf, size, &s);
586 for (i = 0; i < n_files; i++) {
588 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
589 is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
594 for (j = 0; j < ac[i]->nb_streams; j++) {
595 ff_sdp_write_media(buf, size,
596 ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
597 dst_type, (port > 0) ? port + j * 2 : 0, ttl,
600 av_strlcatf(buf, size,
601 "a=control:streamid=%d\r\n", i + j);
609 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
611 return AVERROR(ENOSYS);
614 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl, int flags)
619 #if FF_API_SDP_CREATE
620 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
622 return av_sdp_create(ac, n_files, buff, size);