LCOV - code coverage report
Current view: top level - libavformat - rdt.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 6 248 2.4 %
Date: 2017-12-14 19:11:59 Functions: 1 17 5.9 %

          Line data    Source code
       1             : /*
       2             :  * Realmedia RTSP protocol (RDT) support.
       3             :  * Copyright (c) 2007 Ronald S. Bultje
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * @brief Realmedia RTSP protocol (RDT) support
      25             :  * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
      26             :  */
      27             : 
      28             : #include "avformat.h"
      29             : #include "libavutil/avstring.h"
      30             : #include "rtpdec.h"
      31             : #include "rdt.h"
      32             : #include "libavutil/base64.h"
      33             : #include "libavutil/md5.h"
      34             : #include "rm.h"
      35             : #include "internal.h"
      36             : #include "avio_internal.h"
      37             : #include "libavcodec/get_bits.h"
      38             : 
      39             : struct RDTDemuxContext {
      40             :     AVFormatContext *ic; /**< the containing (RTSP) demux context */
      41             :     /** Each RDT stream-set (represented by one RTSPStream) can contain
      42             :      * multiple streams (of the same content, but with possibly different
      43             :      * codecs/bitrates). Each such stream is represented by one AVStream
      44             :      * in the AVFormatContext, and this variable points to the offset in
      45             :      * that array such that the first is the first stream of this set. */
      46             :     AVStream **streams;
      47             :     int n_streams; /**< streams with identical content in this set */
      48             :     void *dynamic_protocol_context;
      49             :     DynamicPayloadPacketHandlerProc parse_packet;
      50             :     uint32_t prev_timestamp;
      51             :     int prev_set_id, prev_stream_id;
      52             : };
      53             : 
      54             : RDTDemuxContext *
      55           0 : ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx,
      56             :                   void *priv_data, RTPDynamicProtocolHandler *handler)
      57             : {
      58           0 :     RDTDemuxContext *s = av_mallocz(sizeof(RDTDemuxContext));
      59           0 :     if (!s)
      60           0 :         return NULL;
      61             : 
      62           0 :     s->ic = ic;
      63           0 :     s->streams = &ic->streams[first_stream_of_set_idx];
      64             :     do {
      65           0 :         s->n_streams++;
      66           0 :     } while (first_stream_of_set_idx + s->n_streams < ic->nb_streams &&
      67           0 :              s->streams[s->n_streams]->id == s->streams[0]->id);
      68           0 :     s->prev_set_id    = -1;
      69           0 :     s->prev_stream_id = -1;
      70           0 :     s->prev_timestamp = -1;
      71           0 :     s->parse_packet = handler ? handler->parse_packet : NULL;
      72           0 :     s->dynamic_protocol_context = priv_data;
      73             : 
      74           0 :     return s;
      75             : }
      76             : 
      77             : void
      78           0 : ff_rdt_parse_close(RDTDemuxContext *s)
      79             : {
      80           0 :     av_free(s);
      81           0 : }
      82             : 
      83             : struct PayloadContext {
      84             :     AVFormatContext *rmctx;
      85             :     int nb_rmst;
      86             :     RMStream **rmst;
      87             :     uint8_t *mlti_data;
      88             :     unsigned int mlti_data_size;
      89             :     char buffer[RTP_MAX_PACKET_LENGTH + AV_INPUT_BUFFER_PADDING_SIZE];
      90             :     int audio_pkt_cnt; /**< remaining audio packets in rmdec */
      91             : };
      92             : 
      93             : void
      94           0 : ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
      95             :                                   const char *challenge)
      96             : {
      97           0 :     int ch_len = strlen (challenge), i;
      98             :     unsigned char zres[16],
      99           0 :         buf[64] = { 0xa1, 0xe9, 0x14, 0x9d, 0x0e, 0x6b, 0x3b, 0x59 };
     100             : #define XOR_TABLE_SIZE 37
     101             :     static const unsigned char xor_table[XOR_TABLE_SIZE] = {
     102             :         0x05, 0x18, 0x74, 0xd0, 0x0d, 0x09, 0x02, 0x53,
     103             :         0xc0, 0x01, 0x05, 0x05, 0x67, 0x03, 0x19, 0x70,
     104             :         0x08, 0x27, 0x66, 0x10, 0x10, 0x72, 0x08, 0x09,
     105             :         0x63, 0x11, 0x03, 0x71, 0x08, 0x08, 0x70, 0x02,
     106             :         0x10, 0x57, 0x05, 0x18, 0x54 };
     107             : 
     108             :     /* some (length) checks */
     109           0 :     if (ch_len == 40) /* what a hack... */
     110           0 :         ch_len = 32;
     111           0 :     else if (ch_len > 56)
     112           0 :         ch_len = 56;
     113           0 :     memcpy(buf + 8, challenge, ch_len);
     114             : 
     115             :     /* xor challenge bytewise with xor_table */
     116           0 :     for (i = 0; i < XOR_TABLE_SIZE; i++)
     117           0 :         buf[8 + i] ^= xor_table[i];
     118             : 
     119           0 :     av_md5_sum(zres, buf, 64);
     120           0 :     ff_data_to_hex(response, zres, 16, 1);
     121             : 
     122             :     /* add tail */
     123           0 :     strcpy (response + 32, "01d0a8e3");
     124             : 
     125             :     /* calculate checksum */
     126           0 :     for (i = 0; i < 8; i++)
     127           0 :         chksum[i] = response[i * 4];
     128           0 :     chksum[8] = 0;
     129           0 : }
     130             : 
     131             : static int
     132           0 : rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
     133             : {
     134             :     AVIOContext pb;
     135             :     unsigned int size;
     136             :     uint32_t tag;
     137             : 
     138             :     /**
     139             :      * Layout of the MLTI chunk:
     140             :      * 4: MLTI
     141             :      * 2: number of streams
     142             :      * Then for each stream ([number_of_streams] times):
     143             :      *     2: mdpr index
     144             :      * 2: number of mdpr chunks
     145             :      * Then for each mdpr chunk ([number_of_mdpr_chunks] times):
     146             :      *     4: size
     147             :      *     [size]: data
     148             :      * we skip MDPR chunks until we reach the one of the stream
     149             :      * we're interested in, and forward that ([size]+[data]) to
     150             :      * the RM demuxer to parse the stream-specific header data.
     151             :      */
     152           0 :     if (!rdt->mlti_data)
     153           0 :         return -1;
     154           0 :     ffio_init_context(&pb, rdt->mlti_data, rdt->mlti_data_size, 0,
     155             :                   NULL, NULL, NULL, NULL);
     156           0 :     tag = avio_rl32(&pb);
     157           0 :     if (tag == MKTAG('M', 'L', 'T', 'I')) {
     158             :         int num, chunk_nr;
     159             : 
     160             :         /* read index of MDPR chunk numbers */
     161           0 :         num = avio_rb16(&pb);
     162           0 :         if (rule_nr < 0 || rule_nr >= num)
     163           0 :             return -1;
     164           0 :         avio_skip(&pb, rule_nr * 2);
     165           0 :         chunk_nr = avio_rb16(&pb);
     166           0 :         avio_skip(&pb, (num - 1 - rule_nr) * 2);
     167             : 
     168             :         /* read MDPR chunks */
     169           0 :         num = avio_rb16(&pb);
     170           0 :         if (chunk_nr >= num)
     171           0 :             return -1;
     172           0 :         while (chunk_nr--)
     173           0 :             avio_skip(&pb, avio_rb32(&pb));
     174           0 :         size = avio_rb32(&pb);
     175             :     } else {
     176           0 :         size = rdt->mlti_data_size;
     177           0 :         avio_seek(&pb, 0, SEEK_SET);
     178             :     }
     179           0 :     if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, rdt->rmst[st->index], size, NULL) < 0)
     180           0 :         return -1;
     181             : 
     182           0 :     return 0;
     183             : }
     184             : 
     185             : /**
     186             :  * Actual data handling.
     187             :  */
     188             : 
     189             : int
     190           0 : ff_rdt_parse_header(const uint8_t *buf, int len,
     191             :                     int *pset_id, int *pseq_no, int *pstream_id,
     192             :                     int *pis_keyframe, uint32_t *ptimestamp)
     193             : {
     194             :     GetBitContext gb;
     195           0 :     int consumed = 0, set_id, seq_no, stream_id, is_keyframe,
     196             :         len_included, need_reliable;
     197             :     uint32_t timestamp;
     198             : 
     199             :     /* skip status packets */
     200           0 :     while (len >= 5 && buf[1] == 0xFF /* status packet */) {
     201             :         int pkt_len;
     202             : 
     203           0 :         if (!(buf[0] & 0x80))
     204           0 :             return -1; /* not followed by a data packet */
     205             : 
     206           0 :         pkt_len = AV_RB16(buf+3);
     207           0 :         buf += pkt_len;
     208           0 :         len -= pkt_len;
     209           0 :         consumed += pkt_len;
     210             :     }
     211           0 :     if (len < 16)
     212           0 :         return -1;
     213             :     /**
     214             :      * Layout of the header (in bits):
     215             :      * 1:  len_included
     216             :      *     Flag indicating whether this header includes a length field;
     217             :      *     this can be used to concatenate multiple RDT packets in a
     218             :      *     single UDP/TCP data frame and is used to precede RDT data
     219             :      *     by stream status packets
     220             :      * 1:  need_reliable
     221             :      *     Flag indicating whether this header includes a "reliable
     222             :      *     sequence number"; these are apparently sequence numbers of
     223             :      *     data packets alone. For data packets, this flag is always
     224             :      *     set, according to the Real documentation [1]
     225             :      * 5:  set_id
     226             :      *     ID of a set of streams of identical content, possibly with
     227             :      *     different codecs or bitrates
     228             :      * 1:  is_reliable
     229             :      *     Flag set for certain streams deemed less tolerable for packet
     230             :      *     loss
     231             :      * 16: seq_no
     232             :      *     Packet sequence number; if >=0xFF00, this is a non-data packet
     233             :      *     containing stream status info, the second byte indicates the
     234             :      *     type of status packet (see wireshark docs / source code [2])
     235             :      * if (len_included) {
     236             :      *     16: packet_len
     237             :      * } else {
     238             :      *     packet_len = remainder of UDP/TCP frame
     239             :      * }
     240             :      * 1:  is_back_to_back
     241             :      *     Back-to-Back flag; used for timing, set for one in every 10
     242             :      *     packets, according to the Real documentation [1]
     243             :      * 1:  is_slow_data
     244             :      *     Slow-data flag; currently unused, according to Real docs [1]
     245             :      * 5:  stream_id
     246             :      *     ID of the stream within this particular set of streams
     247             :      * 1:  is_no_keyframe
     248             :      *     Non-keyframe flag (unset if packet belongs to a keyframe)
     249             :      * 32: timestamp (PTS)
     250             :      * if (set_id == 0x1F) {
     251             :      *     16: set_id (extended set-of-streams ID; see set_id)
     252             :      * }
     253             :      * if (need_reliable) {
     254             :      *     16: reliable_seq_no
     255             :      *         Reliable sequence number (see need_reliable)
     256             :      * }
     257             :      * if (stream_id == 0x3F) {
     258             :      *     16: stream_id (extended stream ID; see stream_id)
     259             :      * }
     260             :      * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt
     261             :      * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and
     262             :      *     http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
     263             :      */
     264           0 :     init_get_bits(&gb, buf, len << 3);
     265           0 :     len_included  = get_bits1(&gb);
     266           0 :     need_reliable = get_bits1(&gb);
     267           0 :     set_id        = get_bits(&gb, 5);
     268           0 :     skip_bits(&gb, 1);
     269           0 :     seq_no        = get_bits(&gb, 16);
     270           0 :     if (len_included)
     271           0 :         skip_bits(&gb, 16);
     272           0 :     skip_bits(&gb, 2);
     273           0 :     stream_id     = get_bits(&gb, 5);
     274           0 :     is_keyframe   = !get_bits1(&gb);
     275           0 :     timestamp     = get_bits_long(&gb, 32);
     276           0 :     if (set_id == 0x1f)
     277           0 :         set_id    = get_bits(&gb, 16);
     278           0 :     if (need_reliable)
     279           0 :         skip_bits(&gb, 16);
     280           0 :     if (stream_id == 0x1f)
     281           0 :         stream_id = get_bits(&gb, 16);
     282             : 
     283           0 :     if (pset_id)      *pset_id      = set_id;
     284           0 :     if (pseq_no)      *pseq_no      = seq_no;
     285           0 :     if (pstream_id)   *pstream_id   = stream_id;
     286           0 :     if (pis_keyframe) *pis_keyframe = is_keyframe;
     287           0 :     if (ptimestamp)   *ptimestamp   = timestamp;
     288             : 
     289           0 :     return consumed + (get_bits_count(&gb) >> 3);
     290             : }
     291             : 
     292             : /**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */
     293             : static int
     294           0 : rdt_parse_packet (AVFormatContext *ctx, PayloadContext *rdt, AVStream *st,
     295             :                   AVPacket *pkt, uint32_t *timestamp,
     296             :                   const uint8_t *buf, int len, uint16_t rtp_seq, int flags)
     297             : {
     298           0 :     int seq = 1, res;
     299             :     AVIOContext pb;
     300             : 
     301           0 :     if (rdt->audio_pkt_cnt == 0) {
     302             :         int pos, rmflags;
     303             : 
     304           0 :         ffio_init_context(&pb, (uint8_t *)buf, len, 0, NULL, NULL, NULL, NULL);
     305           0 :         rmflags = (flags & RTP_FLAG_KEY) ? 2 : 0;
     306           0 :         res = ff_rm_parse_packet (rdt->rmctx, &pb, st, rdt->rmst[st->index], len, pkt,
     307           0 :                                   &seq, rmflags, *timestamp);
     308           0 :         pos = avio_tell(&pb);
     309           0 :         if (res < 0)
     310           0 :             return res;
     311           0 :         if (res > 0) {
     312           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
     313           0 :                 memcpy (rdt->buffer, buf + pos, len - pos);
     314           0 :                 rdt->rmctx->pb = avio_alloc_context (rdt->buffer, len - pos, 0,
     315             :                                                     NULL, NULL, NULL, NULL);
     316             :             }
     317           0 :             goto get_cache;
     318             :         }
     319             :     } else {
     320           0 : get_cache:
     321           0 :         rdt->audio_pkt_cnt =
     322           0 :             ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb,
     323           0 :                                   st, rdt->rmst[st->index], pkt);
     324           0 :         if (rdt->audio_pkt_cnt == 0 &&
     325           0 :             st->codecpar->codec_id == AV_CODEC_ID_AAC)
     326           0 :             avio_context_free(&rdt->rmctx->pb);
     327             :     }
     328           0 :     pkt->stream_index = st->index;
     329           0 :     pkt->pts = *timestamp;
     330             : 
     331           0 :     return rdt->audio_pkt_cnt > 0;
     332             : }
     333             : 
     334             : int
     335           0 : ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt,
     336             :                     uint8_t **bufptr, int len)
     337             : {
     338           0 :     uint8_t *buf = bufptr ? *bufptr : NULL;
     339           0 :     int seq_no, flags = 0, stream_id, set_id, is_keyframe;
     340             :     uint32_t timestamp;
     341           0 :     int rv= 0;
     342             : 
     343           0 :     if (!s->parse_packet)
     344           0 :         return -1;
     345             : 
     346           0 :     if (!buf && s->prev_stream_id != -1) {
     347             :         /* return the next packets, if any */
     348           0 :         timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
     349           0 :         rv= s->parse_packet(s->ic, s->dynamic_protocol_context,
     350           0 :                             s->streams[s->prev_stream_id],
     351             :                             pkt, &timestamp, NULL, 0, 0, flags);
     352           0 :         return rv;
     353             :     }
     354             : 
     355           0 :     if (len < 12)
     356           0 :         return -1;
     357           0 :     rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, &timestamp);
     358           0 :     if (rv < 0)
     359           0 :         return rv;
     360           0 :     if (is_keyframe &&
     361           0 :         (set_id != s->prev_set_id || timestamp != s->prev_timestamp ||
     362           0 :          stream_id != s->prev_stream_id)) {
     363           0 :         flags |= RTP_FLAG_KEY;
     364           0 :         s->prev_set_id    = set_id;
     365           0 :         s->prev_timestamp = timestamp;
     366             :     }
     367           0 :     s->prev_stream_id = stream_id;
     368           0 :     buf += rv;
     369           0 :     len -= rv;
     370             : 
     371           0 :      if (s->prev_stream_id >= s->n_streams) {
     372           0 :          s->prev_stream_id = -1;
     373           0 :          return -1;
     374             :      }
     375             : 
     376           0 :     rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
     377           0 :                          s->streams[s->prev_stream_id],
     378             :                          pkt, &timestamp, buf, len, 0, flags);
     379             : 
     380           0 :     return rv;
     381             : }
     382             : 
     383             : void
     384           0 : ff_rdt_subscribe_rule (char *cmd, int size,
     385             :                        int stream_nr, int rule_nr)
     386             : {
     387           0 :     av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d",
     388           0 :                 stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1);
     389           0 : }
     390             : 
     391             : static unsigned char *
     392           0 : rdt_parse_b64buf (unsigned int *target_len, const char *p)
     393             : {
     394             :     unsigned char *target;
     395           0 :     int len = strlen(p);
     396           0 :     if (*p == '\"') {
     397           0 :         p++;
     398           0 :         len -= 2; /* skip embracing " at start/end */
     399             :     }
     400           0 :     *target_len = len * 3 / 4;
     401           0 :     target = av_mallocz(*target_len + AV_INPUT_BUFFER_PADDING_SIZE);
     402           0 :     if (!target)
     403           0 :         return NULL;
     404           0 :     av_base64_decode(target, p, *target_len);
     405           0 :     return target;
     406             : }
     407             : 
     408             : static int
     409           0 : rdt_parse_sdp_line (AVFormatContext *s, int st_index,
     410             :                     PayloadContext *rdt, const char *line)
     411             : {
     412           0 :     AVStream *stream = s->streams[st_index];
     413           0 :     const char *p = line;
     414             : 
     415           0 :     if (av_strstart(p, "OpaqueData:buffer;", &p)) {
     416           0 :         rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
     417           0 :     } else if (av_strstart(p, "StartTime:integer;", &p))
     418           0 :         stream->first_dts = atoi(p);
     419           0 :     else if (av_strstart(p, "ASMRuleBook:string;", &p)) {
     420           0 :         int n, first = -1;
     421             : 
     422           0 :         for (n = 0; n < s->nb_streams; n++)
     423           0 :             if (s->streams[n]->id == stream->id) {
     424           0 :                 int count = s->streams[n]->index + 1, err;
     425           0 :                 if (first == -1) first = n;
     426           0 :                 if (rdt->nb_rmst < count) {
     427           0 :                     if ((err = av_reallocp(&rdt->rmst,
     428             :                                            count * sizeof(*rdt->rmst))) < 0) {
     429           0 :                         rdt->nb_rmst = 0;
     430           0 :                         return err;
     431             :                     }
     432           0 :                     memset(rdt->rmst + rdt->nb_rmst, 0,
     433           0 :                            (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
     434           0 :                     rdt->nb_rmst = count;
     435             :                 }
     436           0 :                 rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
     437           0 :                 if (!rdt->rmst[s->streams[n]->index])
     438           0 :                     return AVERROR(ENOMEM);
     439           0 :                 rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2);
     440             :            }
     441             :     }
     442             : 
     443           0 :     return 0;
     444             : }
     445             : 
     446             : static void
     447           0 : real_parse_asm_rule(AVStream *st, const char *p, const char *end)
     448             : {
     449             :     do {
     450             :         /* can be either averagebandwidth= or AverageBandwidth= */
     451           0 :         if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%"SCNd64, &st->codecpar->bit_rate) == 1)
     452           0 :             break;
     453           0 :         if (!(p = strchr(p, ',')) || p > end)
     454           0 :             p = end;
     455           0 :         p++;
     456           0 :     } while (p < end);
     457           0 : }
     458             : 
     459             : static AVStream *
     460           0 : add_dstream(AVFormatContext *s, AVStream *orig_st)
     461             : {
     462             :     AVStream *st;
     463             : 
     464           0 :     if (!(st = avformat_new_stream(s, NULL)))
     465           0 :         return NULL;
     466           0 :     st->id = orig_st->id;
     467           0 :     st->codecpar->codec_type = orig_st->codecpar->codec_type;
     468           0 :     st->first_dts         = orig_st->first_dts;
     469             : 
     470           0 :     return st;
     471             : }
     472             : 
     473             : static void
     474           0 : real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st,
     475             :                         const char *p)
     476             : {
     477             :     const char *end;
     478           0 :     int n_rules = 0, odd = 0;
     479             :     AVStream *st;
     480             : 
     481             :     /**
     482             :      * The ASMRuleBook contains a list of comma-separated strings per rule,
     483             :      * and each rule is separated by a ;. The last one also has a ; at the
     484             :      * end so we can use it as delimiter.
     485             :      * Every rule occurs twice, once for when the RTSP packet header marker
     486             :      * is set and once for if it isn't. We only read the first because we
     487             :      * don't care much (that's what the "odd" variable is for).
     488             :      * Each rule contains a set of one or more statements, optionally
     489             :      * preceded by a single condition. If there's a condition, the rule
     490             :      * starts with a '#'. Multiple conditions are merged between brackets,
     491             :      * so there are never multiple conditions spread out over separate
     492             :      * statements. Generally, these conditions are bitrate limits (min/max)
     493             :      * for multi-bitrate streams.
     494             :      */
     495           0 :     if (*p == '\"') p++;
     496             :     while (1) {
     497           0 :         if (!(end = strchr(p, ';')))
     498           0 :             break;
     499           0 :         if (!odd && end != p) {
     500           0 :             if (n_rules > 0)
     501           0 :                 st = add_dstream(s, orig_st);
     502             :             else
     503           0 :                 st = orig_st;
     504           0 :             if (!st)
     505           0 :                 break;
     506           0 :             real_parse_asm_rule(st, p, end);
     507           0 :             n_rules++;
     508             :         }
     509           0 :         p = end + 1;
     510           0 :         odd ^= 1;
     511             :     }
     512           0 : }
     513             : 
     514             : void
     515           0 : ff_real_parse_sdp_a_line (AVFormatContext *s, int stream_index,
     516             :                           const char *line)
     517             : {
     518           0 :     const char *p = line;
     519             : 
     520           0 :     if (av_strstart(p, "ASMRuleBook:string;", &p))
     521           0 :         real_parse_asm_rulebook(s, s->streams[stream_index], p);
     522           0 : }
     523             : 
     524             : 
     525             : 
     526           0 : static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
     527             : {
     528             :     int ret;
     529             : 
     530           0 :     rdt->rmctx = avformat_alloc_context();
     531           0 :     if (!rdt->rmctx)
     532           0 :         return AVERROR(ENOMEM);
     533             : 
     534           0 :     if ((ret = ff_copy_whiteblacklists(rdt->rmctx, s)) < 0)
     535           0 :         return ret;
     536             : 
     537           0 :     return avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL);
     538             : }
     539             : 
     540             : static void
     541           0 : rdt_close_context (PayloadContext *rdt)
     542             : {
     543             :     int i;
     544             : 
     545           0 :     for (i = 0; i < rdt->nb_rmst; i++)
     546           0 :         if (rdt->rmst[i]) {
     547           0 :             ff_rm_free_rmstream(rdt->rmst[i]);
     548           0 :             av_freep(&rdt->rmst[i]);
     549             :         }
     550           0 :     if (rdt->rmctx)
     551           0 :         avformat_close_input(&rdt->rmctx);
     552           0 :     av_freep(&rdt->mlti_data);
     553           0 :     av_freep(&rdt->rmst);
     554           0 : }
     555             : 
     556             : #define RDT_HANDLER(n, s, t) \
     557             : static RTPDynamicProtocolHandler rdt_ ## n ## _handler = { \
     558             :     .enc_name         = s, \
     559             :     .codec_type       = t, \
     560             :     .codec_id         = AV_CODEC_ID_NONE, \
     561             :     .priv_data_size   = sizeof(PayloadContext), \
     562             :     .init             = rdt_init, \
     563             :     .parse_sdp_a_line = rdt_parse_sdp_line, \
     564             :     .close            = rdt_close_context, \
     565             :     .parse_packet     = rdt_parse_packet \
     566             : }
     567             : 
     568             : RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO);
     569             : RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO);
     570             : RDT_HANDLER(video,      "x-pn-realvideo",                AVMEDIA_TYPE_VIDEO);
     571             : RDT_HANDLER(audio,      "x-pn-realaudio",                AVMEDIA_TYPE_AUDIO);
     572             : 
     573        5594 : void ff_register_rdt_dynamic_payload_handlers(void)
     574             : {
     575        5594 :     ff_register_dynamic_payload_handler(&rdt_video_handler);
     576        5594 :     ff_register_dynamic_payload_handler(&rdt_audio_handler);
     577        5594 :     ff_register_dynamic_payload_handler(&rdt_live_video_handler);
     578        5594 :     ff_register_dynamic_payload_handler(&rdt_live_audio_handler);
     579        5594 : }

Generated by: LCOV version 1.13