| /* |
| * 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 "libavutil/avstring.h" |
| #include "libavutil/base64.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "avc.h" |
| #include "rtp.h" |
| |
| #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 *dst_addr; /**< destination IP address (can be multicast) */ |
| const char *name; /**< session name (can be an empty string) */ |
| }; |
| |
| static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl) |
| { |
| if (dest_addr) { |
| if (ttl > 0) { |
| av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl); |
| } else { |
| av_strlcatf(buff, size, "c=IN IP4 %s\r\n", 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 IP4 %s\r\n" |
| "t=%d %d\r\n" |
| "s=%s\r\n" |
| "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n", |
| s->sdp_version, |
| s->id, s->version, s->src_addr, |
| s->start_time, s->end_time, |
| s->name); |
| sdp_write_address(buff, size, s->dst_addr, s->ttl); |
| } |
| |
| static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url) |
| { |
| int port; |
| const char *p; |
| |
| url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url); |
| |
| *ttl = 0; |
| p = strchr(url, '?'); |
| if (p) { |
| char buff[64]; |
| int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p); |
| |
| if (is_multicast) { |
| if (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(AVCodecContext *c) |
| { |
| char *psets, *p; |
| const uint8_t *r; |
| const char *pset_string = "; sprop-parameter-sets="; |
| |
| if (c->extradata_size > MAX_EXTRADATA_SIZE) { |
| av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); |
| |
| return NULL; |
| } |
| |
| psets = av_mallocz(MAX_PSET_SIZE); |
| if (psets == NULL) { |
| av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n"); |
| return NULL; |
| } |
| memcpy(psets, pset_string, strlen(pset_string)); |
| p = psets + strlen(pset_string); |
| r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size); |
| while (r < c->extradata + c->extradata_size) { |
| const uint8_t *r1; |
| |
| while (!*(r++)); |
| r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size); |
| if (p != (psets + strlen(pset_string))) { |
| *p = ','; |
| p++; |
| } |
| if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) { |
| av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r); |
| av_free(psets); |
| |
| return NULL; |
| } |
| p += strlen(p); |
| r = r1; |
| } |
| |
| return psets; |
| } |
| |
| static char *extradata2config(AVCodecContext *c) |
| { |
| char *config; |
| |
| if (c->extradata_size > MAX_EXTRADATA_SIZE) { |
| av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); |
| |
| return NULL; |
| } |
| config = av_malloc(10 + c->extradata_size * 2); |
| if (config == NULL) { |
| av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); |
| return NULL; |
| } |
| memcpy(config, "; config=", 9); |
| ff_data_to_hex(config + 9, c->extradata, c->extradata_size); |
| config[9 + c->extradata_size * 2] = 0; |
| |
| return config; |
| } |
| |
| static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type) |
| { |
| char *config = NULL; |
| |
| switch (c->codec_id) { |
| case CODEC_ID_H264: |
| if (c->extradata_size) { |
| config = extradata2psets(c); |
| } |
| av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n" |
| "a=fmtp:%d packetization-mode=1%s\r\n", |
| payload_type, |
| payload_type, config ? config : ""); |
| break; |
| case CODEC_ID_MPEG4: |
| if (c->extradata_size) { |
| config = extradata2config(c); |
| } |
| 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 CODEC_ID_AAC: |
| if (c->extradata_size) { |
| config = extradata2config(c); |
| } else { |
| /* FIXME: maybe we can forge config information based on the |
| * codec parameters... |
| */ |
| av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n"); |
| return NULL; |
| } |
| if (config == NULL) { |
| 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, c->sample_rate, c->channels, |
| payload_type, config); |
| break; |
| case CODEC_ID_PCM_S16BE: |
| if (payload_type >= 96) |
| av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n", |
| payload_type, |
| c->sample_rate, c->channels); |
| break; |
| case CODEC_ID_PCM_MULAW: |
| if (payload_type >= 96) |
| av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n", |
| payload_type, |
| c->sample_rate, c->channels); |
| break; |
| case CODEC_ID_PCM_ALAW: |
| if (payload_type >= 96) |
| av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n", |
| payload_type, |
| c->sample_rate, c->channels); |
| break; |
| default: |
| /* Nothing special to do here... */ |
| break; |
| } |
| |
| av_free(config); |
| |
| return buff; |
| } |
| |
| static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl) |
| { |
| const char *type; |
| int payload_type; |
| |
| payload_type = ff_rtp_get_payload_type(c); |
| if (payload_type < 0) { |
| payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */ |
| } |
| |
| switch (c->codec_type) { |
| case CODEC_TYPE_VIDEO : type = "video" ; break; |
| case CODEC_TYPE_AUDIO : type = "audio" ; break; |
| case CODEC_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, ttl); |
| if (c->bit_rate) { |
| av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000); |
| } |
| |
| sdp_write_media_attributes(buff, size, c, payload_type); |
| } |
| |
| int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size) |
| { |
| AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0); |
| struct sdp_session_level s; |
| int i, j, port, ttl; |
| char dst[32]; |
| |
| memset(buff, 0, size); |
| memset(&s, 0, sizeof(struct sdp_session_level)); |
| s.user = "-"; |
| s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */ |
| 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); |
| if (port > 0) { |
| s.dst_addr = dst; |
| s.ttl = ttl; |
| } |
| } |
| sdp_write_header(buff, 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); |
| } |
| for (j = 0; j < ac[i]->nb_streams; j++) { |
| sdp_write_media(buff, size, |
| ac[i]->streams[j]->codec, dst[0] ? dst : NULL, |
| (port > 0) ? port + j * 2 : 0, ttl); |
| if (port <= 0) { |
| av_strlcatf(buff, size, |
| "a=control:streamid=%d\r\n", i + j); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| #else |
| int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size) |
| { |
| return AVERROR(ENOSYS); |
| } |
| #endif |