/* * copyright (c) 2007 Luca Abeni * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <string.h> #include "libavutil/avstring.h" #include "libavutil/base64.h" #include "libavutil/dict.h" #include "libavutil/parseutils.h" #include "libavutil/opt.h" #include "libavcodec/xiph.h" #include "libavcodec/mpeg4audio.h" #include "avformat.h" #include "internal.h" #include "avc.h" #include "hevc.h" #include "rtp.h" #if CONFIG_NETWORK #include "network.h" #endif #if CONFIG_RTP_MUXER #define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2) struct sdp_session_level { int sdp_version; /**< protocol version (currently 0) */ int id; /**< session ID */ int version; /**< session version */ int start_time; /**< session start time (NTP time, in seconds), or 0 in case of permanent session */ int end_time; /**< session end time (NTP time, in seconds), or 0 if the session is not bounded */ int ttl; /**< TTL, in case of multicast stream */ const char *user; /**< username of the session's creator */ const char *src_addr; /**< IP address of the machine from which the session was created */ const char *src_type; /**< address type of src_addr */ const char *dst_addr; /**< destination IP address (can be multicast) */ const char *dst_type; /**< destination IP address type */ const char *name; /**< session name (can be an empty string) */ }; static void sdp_write_address(char *buff, int size, const char *dest_addr, const char *dest_type, int ttl) { if (dest_addr) { if (!dest_type) dest_type = "IP4"; if (ttl > 0 && !strcmp(dest_type, "IP4")) { /* The TTL should only be specified for IPv4 multicast addresses, * not for IPv6. */ av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl); } else { av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr); } } } static void sdp_write_header(char *buff, int size, struct sdp_session_level *s) { av_strlcatf(buff, size, "v=%d\r\n" "o=- %d %d IN %s %s\r\n" "s=%s\r\n", s->sdp_version, s->id, s->version, s->src_type, s->src_addr, s->name); sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl); av_strlcatf(buff, size, "t=%d %d\r\n" "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n", s->start_time, s->end_time); } #if CONFIG_NETWORK static int resolve_destination(char *dest_addr, int size, char *type, int type_size) { struct addrinfo hints = { 0 }, *ai; int is_multicast; av_strlcpy(type, "IP4", type_size); if (!dest_addr[0]) return 0; /* Resolve the destination, since it must be written * as a numeric IP address in the SDP. */ if (getaddrinfo(dest_addr, NULL, &hints, &ai)) return 0; getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size, NULL, 0, NI_NUMERICHOST); #ifdef AF_INET6 if (ai->ai_family == AF_INET6) av_strlcpy(type, "IP6", type_size); #endif is_multicast = ff_is_multicast_address(ai->ai_addr); freeaddrinfo(ai); return is_multicast; } #else static int resolve_destination(char *dest_addr, int size, char *type, int type_size) { return 0; } #endif static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url) { int port; const char *p; char proto[32]; av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url); *ttl = 0; if (strcmp(proto, "rtp") && strcmp(proto, "srtp")) { /* The url isn't for the actual rtp sessions, * don't parse out anything else than the destination. */ return 0; } p = strchr(url, '?'); if (p) { char buff[64]; if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) { *ttl = strtol(buff, NULL, 10); } else { *ttl = 5; } } return port; } #define MAX_PSET_SIZE 1024 static char *extradata2psets(AVFormatContext *s, AVCodecParameters *par) { char *psets, *p; const uint8_t *r; static const char pset_string[] = "; sprop-parameter-sets="; static const char profile_string[] = "; profile-level-id="; uint8_t *extradata = par->extradata; int extradata_size = par->extradata_size; uint8_t *tmpbuf = NULL; const uint8_t *sps = NULL, *sps_end; if (par->extradata_size > MAX_EXTRADATA_SIZE) { av_log(s, AV_LOG_ERROR, "Too much extradata!\n"); return NULL; } if (par->extradata[0] == 1) { if (ff_avc_write_annexb_extradata(par->extradata, &extradata, &extradata_size)) return NULL; tmpbuf = extradata; } psets = av_mallocz(MAX_PSET_SIZE); if (!psets) { av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n"); av_free(tmpbuf); return NULL; } memcpy(psets, pset_string, strlen(pset_string)); p = psets + strlen(pset_string); r = ff_avc_find_startcode(extradata, extradata + extradata_size); while (r < extradata + extradata_size) { const uint8_t *r1; uint8_t nal_type; while (!*(r++)); nal_type = *r & 0x1f; r1 = ff_avc_find_startcode(r, extradata + extradata_size); if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */ r = r1; continue; } if (p != (psets + strlen(pset_string))) { *p = ','; p++; } if (!sps) { sps = r; sps_end = r1; } if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) { av_log(s, AV_LOG_ERROR, "Cannot Base64-encode %"PTRDIFF_SPECIFIER" %"PTRDIFF_SPECIFIER"!\n", MAX_PSET_SIZE - (p - psets), r1 - r); av_free(psets); av_free(tmpbuf); return NULL; } p += strlen(p); r = r1; } if (sps && sps_end - sps >= 4) { memcpy(p, profile_string, strlen(profile_string)); p += strlen(p); ff_data_to_hex(p, sps + 1, 3, 0); p[6] = '\0'; } av_free(tmpbuf); return psets; } static char *extradata2psets_hevc(AVCodecParameters *par) { char *psets; uint8_t *extradata = par->extradata; int extradata_size = par->extradata_size; uint8_t *tmpbuf = NULL; int ps_pos[3] = { 0 }; static const char * const ps_names[3] = { "vps", "sps", "pps" }; int num_arrays, num_nalus; int pos, i, j; // Convert to hvcc format. Since we need to group multiple NALUs of // the same type, and we might need to convert from one format to the // other anyway, we get away with a little less work by using the hvcc // format. if (par->extradata[0] != 1) { AVIOContext *pb; if (avio_open_dyn_buf(&pb) < 0) return NULL; if (ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0) < 0) { avio_close_dyn_buf(pb, &tmpbuf); goto err; } extradata_size = avio_close_dyn_buf(pb, &extradata); tmpbuf = extradata; } if (extradata_size < 23) goto err; num_arrays = extradata[22]; pos = 23; for (i = 0; i < num_arrays; i++) { int num_nalus, nalu_type; if (pos + 3 > extradata_size) goto err; nalu_type = extradata[pos] & 0x3f; // Not including libavcodec/hevc.h to avoid confusion between // NAL_* with the same name for both H.264 and HEVC. if (nalu_type == 32) // VPS ps_pos[0] = pos; else if (nalu_type == 33) // SPS ps_pos[1] = pos; else if (nalu_type == 34) // PPS ps_pos[2] = pos; num_nalus = AV_RB16(&extradata[pos + 1]); pos += 3; for (j = 0; j < num_nalus; j++) { int len; if (pos + 2 > extradata_size) goto err; len = AV_RB16(&extradata[pos]); pos += 2; if (pos + len > extradata_size) goto err; pos += len; } } if (!ps_pos[0] || !ps_pos[1] || !ps_pos[2]) goto err; psets = av_mallocz(MAX_PSET_SIZE); if (!psets) goto err; psets[0] = '\0'; for (i = 0; i < 3; i++) { pos = ps_pos[i]; if (i > 0) av_strlcat(psets, "; ", MAX_PSET_SIZE); av_strlcatf(psets, MAX_PSET_SIZE, "sprop-%s=", ps_names[i]); // Skipping boundary checks in the input here; we've already traversed // the whole hvcc structure above without issues num_nalus = AV_RB16(&extradata[pos + 1]); pos += 3; for (j = 0; j < num_nalus; j++) { int len = AV_RB16(&extradata[pos]); int strpos; pos += 2; if (j > 0) av_strlcat(psets, ",", MAX_PSET_SIZE); strpos = strlen(psets); if (!av_base64_encode(psets + strpos, MAX_PSET_SIZE - strpos, &extradata[pos], len)) { av_free(psets); goto err; } pos += len; } } av_free(tmpbuf); return psets; err: av_free(tmpbuf); return NULL; } static char *extradata2config(AVFormatContext *s, AVCodecParameters *par) { char *config; if (par->extradata_size > MAX_EXTRADATA_SIZE) { av_log(s, AV_LOG_ERROR, "Too much extradata!\n"); return NULL; } config = av_malloc(10 + par->extradata_size * 2); if (!config) { av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); return NULL; } memcpy(config, "; config=", 9); ff_data_to_hex(config + 9, par->extradata, par->extradata_size, 0); config[9 + par->extradata_size * 2] = 0; return config; } static char *xiph_extradata2config(AVFormatContext *s, AVCodecParameters *par) { char *config, *encoded_config; const uint8_t *header_start[3]; int headers_len, header_len[3], config_len; int first_header_size; switch (par->codec_id) { case AV_CODEC_ID_THEORA: first_header_size = 42; break; case AV_CODEC_ID_VORBIS: first_header_size = 30; break; default: av_log(s, AV_LOG_ERROR, "Unsupported Xiph codec ID\n"); return NULL; } if (avpriv_split_xiph_headers(par->extradata, par->extradata_size, first_header_size, header_start, header_len) < 0) { av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n"); return NULL; } headers_len = header_len[0] + header_len[2]; config_len = 4 + // count 3 + // ident 2 + // packet size 1 + // header count 2 + // header size headers_len; // and the rest config = av_malloc(config_len); if (!config) goto xiph_fail; encoded_config = av_malloc(AV_BASE64_SIZE(config_len)); if (!encoded_config) { av_free(config); goto xiph_fail; } config[0] = config[1] = config[2] = 0; config[3] = 1; config[4] = (RTP_XIPH_IDENT >> 16) & 0xff; config[5] = (RTP_XIPH_IDENT >> 8) & 0xff; config[6] = (RTP_XIPH_IDENT ) & 0xff; config[7] = (headers_len >> 8) & 0xff; config[8] = headers_len & 0xff; config[9] = 2; config[10] = header_len[0]; config[11] = 0; // size of comment header; nonexistent memcpy(config + 12, header_start[0], header_len[0]); memcpy(config + 12 + header_len[0], header_start[2], header_len[2]); av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len), config, config_len); av_free(config); return encoded_config; xiph_fail: av_log(s, AV_LOG_ERROR, "Not enough memory for configuration string\n"); return NULL; } static int latm_context2profilelevel(AVCodecParameters *par) { /* MP4A-LATM * The RTP payload format specification is described in RFC 3016 * The encoding specifications are provided in ISO/IEC 14496-3 */ int profile_level = 0x2B; /* TODO: AAC Profile only supports AAC LC Object Type. * Different Object Types should implement different Profile Levels */ if (par->sample_rate <= 24000) { if (par->channels <= 2) profile_level = 0x28; // AAC Profile, Level 1 } else if (par->sample_rate <= 48000) { if (par->channels <= 2) { profile_level = 0x29; // AAC Profile, Level 2 } else if (par->channels <= 5) { profile_level = 0x2A; // AAC Profile, Level 4 } } else if (par->sample_rate <= 96000) { if (par->channels <= 5) { profile_level = 0x2B; // AAC Profile, Level 5 } } return profile_level; } static char *latm_context2config(AVFormatContext *s, AVCodecParameters *par) { /* MP4A-LATM * The RTP payload format specification is described in RFC 3016 * The encoding specifications are provided in ISO/IEC 14496-3 */ uint8_t config_byte[6]; int rate_index; char *config; for (rate_index = 0; rate_index < 16; rate_index++) if (avpriv_mpeg4audio_sample_rates[rate_index] == par->sample_rate) break; if (rate_index == 16) { av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n"); return NULL; } config_byte[0] = 0x40; config_byte[1] = 0; config_byte[2] = 0x20 | rate_index; config_byte[3] = par->channels << 4; config_byte[4] = 0x3f; config_byte[5] = 0xc0; config = av_malloc(6*2+1); if (!config) { av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); return NULL; } ff_data_to_hex(config, config_byte, 6, 1); config[12] = 0; return config; } static char *sdp_write_media_attributes(char *buff, int size, AVStream *st, int payload_type, AVFormatContext *fmt) { char *config = NULL; AVCodecParameters *p = st->codecpar; switch (p->codec_id) { case AV_CODEC_ID_DIRAC: av_strlcatf(buff, size, "a=rtpmap:%d VC2/90000\r\n", payload_type); break; case AV_CODEC_ID_H264: { int mode = 1; if (fmt && fmt->oformat && fmt->oformat->priv_class && av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0")) mode = 0; if (p->extradata_size) { config = extradata2psets(fmt, p); } av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n" "a=fmtp:%d packetization-mode=%d%s\r\n", payload_type, payload_type, mode, config ? config : ""); break; } case AV_CODEC_ID_H261: { const char *pic_fmt = NULL; /* only QCIF and CIF are specified as supported in RFC 4587 */ if (p->width == 176 && p->height == 144) pic_fmt = "QCIF=1"; else if (p->width == 352 && p->height == 288) pic_fmt = "CIF=1"; if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n", payload_type); if (pic_fmt) av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type, pic_fmt); break; } case AV_CODEC_ID_H263: case AV_CODEC_ID_H263P: /* a=framesize is required by 3GPP TS 26.234 (PSS). It * actually specifies the maximum video size, but we only know * the current size. This is required for playback on Android * stagefright and on Samsung bada. */ if (!fmt || !fmt->oformat->priv_class || !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") || p->codec_id == AV_CODEC_ID_H263P) av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n" "a=framesize:%d %d-%d\r\n", payload_type, payload_type, p->width, p->height); break; case AV_CODEC_ID_HEVC: if (p->extradata_size) config = extradata2psets_hevc(p); av_strlcatf(buff, size, "a=rtpmap:%d H265/90000\r\n", payload_type); if (config) av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type, config); break; case AV_CODEC_ID_MPEG4: if (p->extradata_size) { config = extradata2config(fmt, p); } av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n" "a=fmtp:%d profile-level-id=1%s\r\n", payload_type, payload_type, config ? config : ""); break; case AV_CODEC_ID_AAC: if (fmt && fmt->oformat && fmt->oformat->priv_class && av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) { config = latm_context2config(fmt, p); if (!config) return NULL; av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n" "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n", payload_type, p->sample_rate, p->channels, payload_type, latm_context2profilelevel(p), config); } else { if (p->extradata_size) { config = extradata2config(fmt, p); } else { /* FIXME: maybe we can forge config information based on the * codec parameters... */ av_log(fmt, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n"); return NULL; } if (!config) { return NULL; } av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n" "a=fmtp:%d profile-level-id=1;" "mode=AAC-hbr;sizelength=13;indexlength=3;" "indexdeltalength=3%s\r\n", payload_type, p->sample_rate, p->channels, payload_type, config); } break; case AV_CODEC_ID_PCM_S16BE: if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n", payload_type, p->sample_rate, p->channels); break; case AV_CODEC_ID_PCM_MULAW: if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n", payload_type, p->sample_rate, p->channels); break; case AV_CODEC_ID_PCM_ALAW: if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n", payload_type, p->sample_rate, p->channels); break; case AV_CODEC_ID_AMR_NB: av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n" "a=fmtp:%d octet-align=1\r\n", payload_type, p->sample_rate, p->channels, payload_type); break; case AV_CODEC_ID_AMR_WB: av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n" "a=fmtp:%d octet-align=1\r\n", payload_type, p->sample_rate, p->channels, payload_type); break; case AV_CODEC_ID_VORBIS: if (p->extradata_size) config = xiph_extradata2config(fmt, p); else av_log(fmt, AV_LOG_ERROR, "Vorbis configuration info missing\n"); if (!config) return NULL; av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n" "a=fmtp:%d configuration=%s\r\n", payload_type, p->sample_rate, p->channels, payload_type, config); break; case AV_CODEC_ID_THEORA: { const char *pix_fmt; switch (p->format) { case AV_PIX_FMT_YUV420P: pix_fmt = "YCbCr-4:2:0"; break; case AV_PIX_FMT_YUV422P: pix_fmt = "YCbCr-4:2:2"; break; case AV_PIX_FMT_YUV444P: pix_fmt = "YCbCr-4:4:4"; break; default: av_log(fmt, AV_LOG_ERROR, "Unsupported pixel format.\n"); return NULL; } if (p->extradata_size) config = xiph_extradata2config(fmt, p); else av_log(fmt, AV_LOG_ERROR, "Theora configuration info missing\n"); if (!config) return NULL; av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n" "a=fmtp:%d delivery-method=inline; " "width=%d; height=%d; sampling=%s; " "configuration=%s\r\n", payload_type, payload_type, p->width, p->height, pix_fmt, config); break; } case AV_CODEC_ID_VP8: av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n", payload_type); break; case AV_CODEC_ID_VP9: av_strlcatf(buff, size, "a=rtpmap:%d VP9/90000\r\n", payload_type); break; case AV_CODEC_ID_MJPEG: if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n", payload_type); break; case AV_CODEC_ID_ADPCM_G722: if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n", payload_type, 8000, p->channels); break; case AV_CODEC_ID_ADPCM_G726: { if (payload_type >= RTP_PT_PRIVATE) av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n", payload_type, p->bits_per_coded_sample*8, p->sample_rate); break; } case AV_CODEC_ID_ILBC: av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n" "a=fmtp:%d mode=%d\r\n", payload_type, p->sample_rate, payload_type, p->block_align == 38 ? 20 : 30); break; case AV_CODEC_ID_SPEEX: av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n", payload_type, p->sample_rate); if (st->codec) { const char *mode; uint64_t vad_option; if (st->codec->flags & AV_CODEC_FLAG_QSCALE) mode = "on"; else if (!av_opt_get_int(st->codec, "vad", AV_OPT_FLAG_ENCODING_PARAM, &vad_option) && vad_option) mode = "vad"; else mode = "off"; av_strlcatf(buff, size, "a=fmtp:%d vbr=%s\r\n", payload_type, mode); } break; case AV_CODEC_ID_OPUS: /* The opus RTP draft says that all opus streams MUST be declared as stereo, to avoid negotiation failures. The actual number of channels can change on a packet-by-packet basis. The number of channels a receiver prefers to receive or a sender plans to send can be declared via fmtp parameters (both default to mono), but receivers MUST be able to receive and process stereo packets. */ av_strlcatf(buff, size, "a=rtpmap:%d opus/48000/2\r\n", payload_type); if (p->channels == 2) { av_strlcatf(buff, size, "a=fmtp:%d sprop-stereo=1\r\n", payload_type); } break; default: /* Nothing special to do here... */ break; } av_free(config); return buff; } void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt) { AVCodecParameters *p = st->codecpar; const char *type; int payload_type; payload_type = ff_rtp_get_payload_type(fmt, st->codecpar, idx); switch (p->codec_type) { case AVMEDIA_TYPE_VIDEO : type = "video" ; break; case AVMEDIA_TYPE_AUDIO : type = "audio" ; break; case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break; default : type = "application"; break; } av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type); sdp_write_address(buff, size, dest_addr, dest_type, ttl); if (p->bit_rate) { av_strlcatf(buff, size, "b=AS:%"PRId64"\r\n", (int64_t)p->bit_rate / 1000); } sdp_write_media_attributes(buff, size, st, payload_type, fmt); } int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size) { AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0); struct sdp_session_level s = { 0 }; int i, j, port, ttl, is_multicast, index = 0; char dst[32], dst_type[5]; memset(buf, 0, size); s.user = "-"; s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */ s.src_type = "IP4"; s.name = title ? title->value : "No Name"; port = 0; ttl = 0; if (n_files == 1) { port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename); is_multicast = resolve_destination(dst, sizeof(dst), dst_type, sizeof(dst_type)); if (!is_multicast) ttl = 0; if (dst[0]) { s.dst_addr = dst; s.dst_type = dst_type; s.ttl = ttl; if (!strcmp(dst_type, "IP6")) { s.src_addr = "::1"; s.src_type = "IP6"; } } } sdp_write_header(buf, size, &s); dst[0] = 0; for (i = 0; i < n_files; i++) { if (n_files != 1) { port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename); is_multicast = resolve_destination(dst, sizeof(dst), dst_type, sizeof(dst_type)); if (!is_multicast) ttl = 0; } for (j = 0; j < ac[i]->nb_streams; j++) { ff_sdp_write_media(buf, size, ac[i]->streams[j], index++, dst[0] ? dst : NULL, dst_type, (port > 0) ? port + j * 2 : 0, ttl, ac[i]); if (port <= 0) { av_strlcatf(buf, size, "a=control:streamid=%d\r\n", i + j); } if (ac[i]->pb && ac[i]->pb->av_class) { uint8_t *crypto_suite = NULL, *crypto_params = NULL; av_opt_get(ac[i]->pb, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN, &crypto_suite); av_opt_get(ac[i]->pb, "srtp_out_params", AV_OPT_SEARCH_CHILDREN, &crypto_params); if (crypto_suite && crypto_suite[0]) av_strlcatf(buf, size, "a=crypto:1 %s inline:%s\r\n", crypto_suite, crypto_params); av_free(crypto_suite); av_free(crypto_params); } } } return 0; } #else int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size) { return AVERROR(ENOSYS); } void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt) { } #endif