mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 9806 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/*
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* copyright (c) 2007 Luca Abeni |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avstring.h" |
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#include "avformat.h" |
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#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2) |
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struct sdp_session_level { |
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int sdp_version; /**< protocol version (currently 0) */ |
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int id; /**< session id */ |
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int version; /**< session version */ |
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int start_time; /**< session start time (NTP time, in seconds),
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or 0 in case of permanent session */ |
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int end_time; /**< session end time (NTP time, in seconds),
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or 0 if the session is not bounded */ |
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int ttl; /**< TTL, in case of multicast stream */ |
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const char *user; /**< username of the session's creator */ |
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const char *src_addr; /**< IP address of the machine from which the session was created */ |
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const char *dst_addr; /**< destination IP address (can be multicast) */ |
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const char *name; /**< session name (can be an empty string) */ |
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}; |
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static void dest_write(char *buff, int size, const char *dest_addr, int ttl) |
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{ |
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if (dest_addr) { |
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if (ttl > 0) { |
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av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl); |
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} else { |
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av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr); |
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} |
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} |
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} |
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static void sdp_write_header(char *buff, int size, struct sdp_session_level *s) |
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{ |
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av_strlcatf(buff, size, "v=%d\r\n" |
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"o=- %d %d IN IPV4 %s\r\n" |
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"t=%d %d\r\n" |
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"s=%s\r\n" |
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"a=tool:libavformat\r\n", |
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s->sdp_version, |
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s->id, s->version, s->src_addr, |
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s->start_time, s->end_time, |
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s->name[0] ? s->name : "No Name"); |
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dest_write(buff, size, s->dst_addr, s->ttl); |
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} |
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static int get_address(char *dest_addr, int size, int *ttl, const char *url) |
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{ |
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int port; |
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const char *p; |
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url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url); |
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*ttl = 0; |
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p = strchr(url, '?'); |
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if (p) { |
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char buff[64]; |
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int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p); |
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if (is_multicast) { |
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if (find_info_tag(buff, sizeof(buff), "ttl", p)) { |
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*ttl = strtol(buff, NULL, 10); |
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} else { |
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*ttl = 5; |
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} |
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} |
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} |
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return port; |
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} |
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static void digit_to_char(char *dst, uint8_t src) |
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{ |
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if (src < 10) { |
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*dst = '0' + src; |
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} else { |
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*dst = 'A' + src - 10; |
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} |
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} |
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static char *data_to_hex(char *buff, const uint8_t *src, int s) |
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{ |
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int i; |
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for(i = 0; i < s; i++) { |
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digit_to_char(buff + 2 * i, src[i] >> 4); |
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digit_to_char(buff + 2 * i + 1, src[i] & 0xF); |
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} |
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return buff; |
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} |
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static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type) |
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{ |
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char *config = NULL; |
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switch (c->codec_id) { |
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case CODEC_ID_MPEG4: |
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if (c->flags & CODEC_FLAG_GLOBAL_HEADER) { |
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if (c->extradata_size > MAX_EXTRADATA_SIZE) { |
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av_log(NULL, AV_LOG_ERROR, "Too many extra data!\n"); |
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return NULL; |
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} |
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config = av_malloc(10 + c->extradata_size * 2); |
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if (config == NULL) { |
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av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory for the config info\n"); |
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return NULL; |
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} |
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memcpy(config, "; config=", 9); |
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data_to_hex(config + 9, c->extradata, c->extradata_size); |
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config[9 + c->extradata_size * 2] = 0; |
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} |
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av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n" |
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"a=fmtp:%d profile-level-id=1%s\r\n", |
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payload_type, |
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payload_type, config ? config : ""); |
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break; |
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default: |
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/* Nothing special to do, here... */ |
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break; |
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} |
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av_free(config); |
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return buff; |
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} |
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static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl) |
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{ |
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const char *type; |
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int payload_type; |
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payload_type = rtp_get_payload_type(c); |
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if (payload_type < 0) { |
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payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */ |
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} |
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switch (c->codec_type) { |
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case CODEC_TYPE_VIDEO : type = "video" ; break; |
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case CODEC_TYPE_AUDIO : type = "audio" ; break; |
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case CODEC_TYPE_SUBTITLE: type = "text" ; break; |
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default : type = "application"; break; |
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} |
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av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type); |
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dest_write(buff, size, dest_addr, ttl); |
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sdp_media_attributes(buff, size, c, payload_type); |
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} |
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#define SDP_BUFFER_SIZE 2048 |
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char *avf_sdp_create(AVFormatContext *ac[], int n_files) |
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{ |
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char *buff; |
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struct sdp_session_level s; |
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int i, j, port, ttl; |
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char dst[32]; |
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buff = av_mallocz(SDP_BUFFER_SIZE); |
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if (buff == NULL) { |
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return NULL; |
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} |
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memset(&s, 0, sizeof(struct sdp_session_level)); |
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s.user = "-"; |
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s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */ |
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s.name = ac[0]->title; |
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port = 0; |
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ttl = 0; |
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if (n_files == 1) { |
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port = get_address(dst, sizeof(dst), &ttl, ac[0]->filename); |
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if (port > 0) { |
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s.dst_addr = dst; |
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s.ttl = ttl; |
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} |
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} |
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sdp_write_header(buff, SDP_BUFFER_SIZE, &s); |
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dst[0] = 0; |
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for (i = 0; i < n_files; i++) { |
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if (n_files != 1) { |
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port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename); |
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} |
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for (j = 0; j < ac[i]->nb_streams; j++) { |
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sdp_write_media(buff, SDP_BUFFER_SIZE, |
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ac[i]->streams[j]->codec, dst[0] ? dst : NULL, |
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(port > 0) ? port + j * 2 : 0, ttl); |
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if (port <= 0) { |
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av_strlcatf(buff, SDP_BUFFER_SIZE, |
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"a=control:streamid=%d\r\n", i + j); |
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} |
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} |
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} |
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return buff; |
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} |
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