yading@11: /* yading@11: * Realmedia RTSP protocol (RDT) support. yading@11: * Copyright (c) 2007 Ronald S. Bultje yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: /** yading@11: * @file yading@11: * @brief Realmedia RTSP protocol (RDT) support yading@11: * @author Ronald S. Bultje yading@11: */ yading@11: yading@11: #include "avformat.h" yading@11: #include "libavutil/avstring.h" yading@11: #include "rtpdec.h" yading@11: #include "rdt.h" yading@11: #include "libavutil/base64.h" yading@11: #include "libavutil/md5.h" yading@11: #include "rm.h" yading@11: #include "internal.h" yading@11: #include "avio_internal.h" yading@11: #include "libavcodec/get_bits.h" yading@11: yading@11: struct RDTDemuxContext { yading@11: AVFormatContext *ic; /**< the containing (RTSP) demux context */ yading@11: /** Each RDT stream-set (represented by one RTSPStream) can contain yading@11: * multiple streams (of the same content, but with possibly different yading@11: * codecs/bitrates). Each such stream is represented by one AVStream yading@11: * in the AVFormatContext, and this variable points to the offset in yading@11: * that array such that the first is the first stream of this set. */ yading@11: AVStream **streams; yading@11: int n_streams; /**< streams with identifical content in this set */ yading@11: void *dynamic_protocol_context; yading@11: DynamicPayloadPacketHandlerProc parse_packet; yading@11: uint32_t prev_timestamp; yading@11: int prev_set_id, prev_stream_id; yading@11: }; yading@11: yading@11: RDTDemuxContext * yading@11: ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx, yading@11: void *priv_data, RTPDynamicProtocolHandler *handler) yading@11: { yading@11: RDTDemuxContext *s = av_mallocz(sizeof(RDTDemuxContext)); yading@11: if (!s) yading@11: return NULL; yading@11: yading@11: s->ic = ic; yading@11: s->streams = &ic->streams[first_stream_of_set_idx]; yading@11: do { yading@11: s->n_streams++; yading@11: } while (first_stream_of_set_idx + s->n_streams < ic->nb_streams && yading@11: s->streams[s->n_streams]->id == s->streams[0]->id); yading@11: s->prev_set_id = -1; yading@11: s->prev_stream_id = -1; yading@11: s->prev_timestamp = -1; yading@11: s->parse_packet = handler ? handler->parse_packet : NULL; yading@11: s->dynamic_protocol_context = priv_data; yading@11: yading@11: return s; yading@11: } yading@11: yading@11: void yading@11: ff_rdt_parse_close(RDTDemuxContext *s) yading@11: { yading@11: av_free(s); yading@11: } yading@11: yading@11: struct PayloadContext { yading@11: AVFormatContext *rmctx; yading@11: int nb_rmst; yading@11: RMStream **rmst; yading@11: uint8_t *mlti_data; yading@11: unsigned int mlti_data_size; yading@11: char buffer[RTP_MAX_PACKET_LENGTH + FF_INPUT_BUFFER_PADDING_SIZE]; yading@11: int audio_pkt_cnt; /**< remaining audio packets in rmdec */ yading@11: }; yading@11: yading@11: void yading@11: ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], yading@11: const char *challenge) yading@11: { yading@11: int ch_len = strlen (challenge), i; yading@11: unsigned char zres[16], yading@11: buf[64] = { 0xa1, 0xe9, 0x14, 0x9d, 0x0e, 0x6b, 0x3b, 0x59 }; yading@11: #define XOR_TABLE_SIZE 37 yading@11: const unsigned char xor_table[XOR_TABLE_SIZE] = { yading@11: 0x05, 0x18, 0x74, 0xd0, 0x0d, 0x09, 0x02, 0x53, yading@11: 0xc0, 0x01, 0x05, 0x05, 0x67, 0x03, 0x19, 0x70, yading@11: 0x08, 0x27, 0x66, 0x10, 0x10, 0x72, 0x08, 0x09, yading@11: 0x63, 0x11, 0x03, 0x71, 0x08, 0x08, 0x70, 0x02, yading@11: 0x10, 0x57, 0x05, 0x18, 0x54 }; yading@11: yading@11: /* some (length) checks */ yading@11: if (ch_len == 40) /* what a hack... */ yading@11: ch_len = 32; yading@11: else if (ch_len > 56) yading@11: ch_len = 56; yading@11: memcpy(buf + 8, challenge, ch_len); yading@11: yading@11: /* xor challenge bytewise with xor_table */ yading@11: for (i = 0; i < XOR_TABLE_SIZE; i++) yading@11: buf[8 + i] ^= xor_table[i]; yading@11: yading@11: av_md5_sum(zres, buf, 64); yading@11: ff_data_to_hex(response, zres, 16, 1); yading@11: yading@11: /* add tail */ yading@11: strcpy (response + 32, "01d0a8e3"); yading@11: yading@11: /* calculate checksum */ yading@11: for (i = 0; i < 8; i++) yading@11: chksum[i] = response[i * 4]; yading@11: chksum[8] = 0; yading@11: } yading@11: yading@11: static int yading@11: rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr) yading@11: { yading@11: AVIOContext pb; yading@11: int size; yading@11: uint32_t tag; yading@11: yading@11: /** yading@11: * Layout of the MLTI chunk: yading@11: * 4: MLTI yading@11: * 2: number of streams yading@11: * Then for each stream ([number_of_streams] times): yading@11: * 2: mdpr index yading@11: * 2: number of mdpr chunks yading@11: * Then for each mdpr chunk ([number_of_mdpr_chunks] times): yading@11: * 4: size yading@11: * [size]: data yading@11: * we skip MDPR chunks until we reach the one of the stream yading@11: * we're interested in, and forward that ([size]+[data]) to yading@11: * the RM demuxer to parse the stream-specific header data. yading@11: */ yading@11: if (!rdt->mlti_data) yading@11: return -1; yading@11: ffio_init_context(&pb, rdt->mlti_data, rdt->mlti_data_size, 0, yading@11: NULL, NULL, NULL, NULL); yading@11: tag = avio_rl32(&pb); yading@11: if (tag == MKTAG('M', 'L', 'T', 'I')) { yading@11: int num, chunk_nr; yading@11: yading@11: /* read index of MDPR chunk numbers */ yading@11: num = avio_rb16(&pb); yading@11: if (rule_nr < 0 || rule_nr >= num) yading@11: return -1; yading@11: avio_skip(&pb, rule_nr * 2); yading@11: chunk_nr = avio_rb16(&pb); yading@11: avio_skip(&pb, (num - 1 - rule_nr) * 2); yading@11: yading@11: /* read MDPR chunks */ yading@11: num = avio_rb16(&pb); yading@11: if (chunk_nr >= num) yading@11: return -1; yading@11: while (chunk_nr--) yading@11: avio_skip(&pb, avio_rb32(&pb)); yading@11: size = avio_rb32(&pb); yading@11: } else { yading@11: size = rdt->mlti_data_size; yading@11: avio_seek(&pb, 0, SEEK_SET); yading@11: } yading@11: if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, rdt->rmst[st->index], size, NULL) < 0) yading@11: return -1; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: /** yading@11: * Actual data handling. yading@11: */ yading@11: yading@11: int yading@11: ff_rdt_parse_header(const uint8_t *buf, int len, yading@11: int *pset_id, int *pseq_no, int *pstream_id, yading@11: int *pis_keyframe, uint32_t *ptimestamp) yading@11: { yading@11: GetBitContext gb; yading@11: int consumed = 0, set_id, seq_no, stream_id, is_keyframe, yading@11: len_included, need_reliable; yading@11: uint32_t timestamp; yading@11: yading@11: /* skip status packets */ yading@11: while (len >= 5 && buf[1] == 0xFF /* status packet */) { yading@11: int pkt_len; yading@11: yading@11: if (!(buf[0] & 0x80)) yading@11: return -1; /* not followed by a data packet */ yading@11: yading@11: pkt_len = AV_RB16(buf+3); yading@11: buf += pkt_len; yading@11: len -= pkt_len; yading@11: consumed += pkt_len; yading@11: } yading@11: if (len < 16) yading@11: return -1; yading@11: /** yading@11: * Layout of the header (in bits): yading@11: * 1: len_included yading@11: * Flag indicating whether this header includes a length field; yading@11: * this can be used to concatenate multiple RDT packets in a yading@11: * single UDP/TCP data frame and is used to precede RDT data yading@11: * by stream status packets yading@11: * 1: need_reliable yading@11: * Flag indicating whether this header includes a "reliable yading@11: * sequence number"; these are apparently sequence numbers of yading@11: * data packets alone. For data packets, this flag is always yading@11: * set, according to the Real documentation [1] yading@11: * 5: set_id yading@11: * ID of a set of streams of identical content, possibly with yading@11: * different codecs or bitrates yading@11: * 1: is_reliable yading@11: * Flag set for certain streams deemed less tolerable for packet yading@11: * loss yading@11: * 16: seq_no yading@11: * Packet sequence number; if >=0xFF00, this is a non-data packet yading@11: * containing stream status info, the second byte indicates the yading@11: * type of status packet (see wireshark docs / source code [2]) yading@11: * if (len_included) { yading@11: * 16: packet_len yading@11: * } else { yading@11: * packet_len = remainder of UDP/TCP frame yading@11: * } yading@11: * 1: is_back_to_back yading@11: * Back-to-Back flag; used for timing, set for one in every 10 yading@11: * packets, according to the Real documentation [1] yading@11: * 1: is_slow_data yading@11: * Slow-data flag; currently unused, according to Real docs [1] yading@11: * 5: stream_id yading@11: * ID of the stream within this particular set of streams yading@11: * 1: is_no_keyframe yading@11: * Non-keyframe flag (unset if packet belongs to a keyframe) yading@11: * 32: timestamp (PTS) yading@11: * if (set_id == 0x1F) { yading@11: * 16: set_id (extended set-of-streams ID; see set_id) yading@11: * } yading@11: * if (need_reliable) { yading@11: * 16: reliable_seq_no yading@11: * Reliable sequence number (see need_reliable) yading@11: * } yading@11: * if (stream_id == 0x3F) { yading@11: * 16: stream_id (extended stream ID; see stream_id) yading@11: * } yading@11: * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt yading@11: * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and yading@11: * http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c yading@11: */ yading@11: init_get_bits(&gb, buf, len << 3); yading@11: len_included = get_bits1(&gb); yading@11: need_reliable = get_bits1(&gb); yading@11: set_id = get_bits(&gb, 5); yading@11: skip_bits(&gb, 1); yading@11: seq_no = get_bits(&gb, 16); yading@11: if (len_included) yading@11: skip_bits(&gb, 16); yading@11: skip_bits(&gb, 2); yading@11: stream_id = get_bits(&gb, 5); yading@11: is_keyframe = !get_bits1(&gb); yading@11: timestamp = get_bits_long(&gb, 32); yading@11: if (set_id == 0x1f) yading@11: set_id = get_bits(&gb, 16); yading@11: if (need_reliable) yading@11: skip_bits(&gb, 16); yading@11: if (stream_id == 0x1f) yading@11: stream_id = get_bits(&gb, 16); yading@11: yading@11: if (pset_id) *pset_id = set_id; yading@11: if (pseq_no) *pseq_no = seq_no; yading@11: if (pstream_id) *pstream_id = stream_id; yading@11: if (pis_keyframe) *pis_keyframe = is_keyframe; yading@11: if (ptimestamp) *ptimestamp = timestamp; yading@11: yading@11: return consumed + (get_bits_count(&gb) >> 3); yading@11: } yading@11: yading@11: /**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */ yading@11: static int yading@11: rdt_parse_packet (AVFormatContext *ctx, PayloadContext *rdt, AVStream *st, yading@11: AVPacket *pkt, uint32_t *timestamp, yading@11: const uint8_t *buf, int len, uint16_t rtp_seq, int flags) yading@11: { yading@11: int seq = 1, res; yading@11: AVIOContext pb; yading@11: yading@11: if (rdt->audio_pkt_cnt == 0) { yading@11: int pos; yading@11: yading@11: ffio_init_context(&pb, buf, len, 0, NULL, NULL, NULL, NULL); yading@11: flags = (flags & RTP_FLAG_KEY) ? 2 : 0; yading@11: res = ff_rm_parse_packet (rdt->rmctx, &pb, st, rdt->rmst[st->index], len, pkt, yading@11: &seq, flags, *timestamp); yading@11: pos = avio_tell(&pb); yading@11: if (res < 0) yading@11: return res; yading@11: if (res > 0) { yading@11: if (st->codec->codec_id == AV_CODEC_ID_AAC) { yading@11: memcpy (rdt->buffer, buf + pos, len - pos); yading@11: rdt->rmctx->pb = avio_alloc_context (rdt->buffer, len - pos, 0, yading@11: NULL, NULL, NULL, NULL); yading@11: } yading@11: goto get_cache; yading@11: } yading@11: } else { yading@11: get_cache: yading@11: rdt->audio_pkt_cnt = yading@11: ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb, yading@11: st, rdt->rmst[st->index], pkt); yading@11: if (rdt->audio_pkt_cnt == 0 && yading@11: st->codec->codec_id == AV_CODEC_ID_AAC) yading@11: av_freep(&rdt->rmctx->pb); yading@11: } yading@11: pkt->stream_index = st->index; yading@11: pkt->pts = *timestamp; yading@11: yading@11: return rdt->audio_pkt_cnt > 0; yading@11: } yading@11: yading@11: int yading@11: ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, yading@11: uint8_t **bufptr, int len) yading@11: { yading@11: uint8_t *buf = bufptr ? *bufptr : NULL; yading@11: int seq_no, flags = 0, stream_id, set_id, is_keyframe; yading@11: uint32_t timestamp; yading@11: int rv= 0; yading@11: yading@11: if (!s->parse_packet) yading@11: return -1; yading@11: yading@11: if (!buf && s->prev_stream_id != -1) { yading@11: /* return the next packets, if any */ yading@11: timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned.... yading@11: rv= s->parse_packet(s->ic, s->dynamic_protocol_context, yading@11: s->streams[s->prev_stream_id], yading@11: pkt, ×tamp, NULL, 0, 0, flags); yading@11: return rv; yading@11: } yading@11: yading@11: if (len < 12) yading@11: return -1; yading@11: rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, ×tamp); yading@11: if (rv < 0) yading@11: return rv; yading@11: if (is_keyframe && yading@11: (set_id != s->prev_set_id || timestamp != s->prev_timestamp || yading@11: stream_id != s->prev_stream_id)) { yading@11: flags |= RTP_FLAG_KEY; yading@11: s->prev_set_id = set_id; yading@11: s->prev_timestamp = timestamp; yading@11: } yading@11: s->prev_stream_id = stream_id; yading@11: buf += rv; yading@11: len -= rv; yading@11: yading@11: if (s->prev_stream_id >= s->n_streams) { yading@11: s->prev_stream_id = -1; yading@11: return -1; yading@11: } yading@11: yading@11: rv = s->parse_packet(s->ic, s->dynamic_protocol_context, yading@11: s->streams[s->prev_stream_id], yading@11: pkt, ×tamp, buf, len, 0, flags); yading@11: yading@11: return rv; yading@11: } yading@11: yading@11: void yading@11: ff_rdt_subscribe_rule (char *cmd, int size, yading@11: int stream_nr, int rule_nr) yading@11: { yading@11: av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d", yading@11: stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1); yading@11: } yading@11: yading@11: static unsigned char * yading@11: rdt_parse_b64buf (unsigned int *target_len, const char *p) yading@11: { yading@11: unsigned char *target; yading@11: int len = strlen(p); yading@11: if (*p == '\"') { yading@11: p++; yading@11: len -= 2; /* skip embracing " at start/end */ yading@11: } yading@11: *target_len = len * 3 / 4; yading@11: target = av_mallocz(*target_len + FF_INPUT_BUFFER_PADDING_SIZE); yading@11: av_base64_decode(target, p, *target_len); yading@11: return target; yading@11: } yading@11: yading@11: static int yading@11: rdt_parse_sdp_line (AVFormatContext *s, int st_index, yading@11: PayloadContext *rdt, const char *line) yading@11: { yading@11: AVStream *stream = s->streams[st_index]; yading@11: const char *p = line; yading@11: yading@11: if (av_strstart(p, "OpaqueData:buffer;", &p)) { yading@11: rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p); yading@11: } else if (av_strstart(p, "StartTime:integer;", &p)) yading@11: stream->first_dts = atoi(p); yading@11: else if (av_strstart(p, "ASMRuleBook:string;", &p)) { yading@11: int n, first = -1; yading@11: yading@11: for (n = 0; n < s->nb_streams; n++) yading@11: if (s->streams[n]->id == stream->id) { yading@11: int count = s->streams[n]->index + 1; yading@11: if (first == -1) first = n; yading@11: if (rdt->nb_rmst < count) { yading@11: RMStream **rmst= av_realloc(rdt->rmst, count*sizeof(*rmst)); yading@11: if (!rmst) yading@11: return AVERROR(ENOMEM); yading@11: memset(rmst + rdt->nb_rmst, 0, yading@11: (count - rdt->nb_rmst) * sizeof(*rmst)); yading@11: rdt->rmst = rmst; yading@11: rdt->nb_rmst = count; yading@11: } yading@11: rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream(); yading@11: rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2); yading@11: } yading@11: } yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static void yading@11: real_parse_asm_rule(AVStream *st, const char *p, const char *end) yading@11: { yading@11: do { yading@11: /* can be either averagebandwidth= or AverageBandwidth= */ yading@11: if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%d", &st->codec->bit_rate) == 1) yading@11: break; yading@11: if (!(p = strchr(p, ',')) || p > end) yading@11: p = end; yading@11: p++; yading@11: } while (p < end); yading@11: } yading@11: yading@11: static AVStream * yading@11: add_dstream(AVFormatContext *s, AVStream *orig_st) yading@11: { yading@11: AVStream *st; yading@11: yading@11: if (!(st = avformat_new_stream(s, NULL))) yading@11: return NULL; yading@11: st->id = orig_st->id; yading@11: st->codec->codec_type = orig_st->codec->codec_type; yading@11: st->first_dts = orig_st->first_dts; yading@11: yading@11: return st; yading@11: } yading@11: yading@11: static void yading@11: real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, yading@11: const char *p) yading@11: { yading@11: const char *end; yading@11: int n_rules = 0, odd = 0; yading@11: AVStream *st; yading@11: yading@11: /** yading@11: * The ASMRuleBook contains a list of comma-separated strings per rule, yading@11: * and each rule is separated by a ;. The last one also has a ; at the yading@11: * end so we can use it as delimiter. yading@11: * Every rule occurs twice, once for when the RTSP packet header marker yading@11: * is set and once for if it isn't. We only read the first because we yading@11: * don't care much (that's what the "odd" variable is for). yading@11: * Each rule contains a set of one or more statements, optionally yading@11: * preceded by a single condition. If there's a condition, the rule yading@11: * starts with a '#'. Multiple conditions are merged between brackets, yading@11: * so there are never multiple conditions spread out over separate yading@11: * statements. Generally, these conditions are bitrate limits (min/max) yading@11: * for multi-bitrate streams. yading@11: */ yading@11: if (*p == '\"') p++; yading@11: while (1) { yading@11: if (!(end = strchr(p, ';'))) yading@11: break; yading@11: if (!odd && end != p) { yading@11: if (n_rules > 0) yading@11: st = add_dstream(s, orig_st); yading@11: else yading@11: st = orig_st; yading@11: if (!st) yading@11: break; yading@11: real_parse_asm_rule(st, p, end); yading@11: n_rules++; yading@11: } yading@11: p = end + 1; yading@11: odd ^= 1; yading@11: } yading@11: } yading@11: yading@11: void yading@11: ff_real_parse_sdp_a_line (AVFormatContext *s, int stream_index, yading@11: const char *line) yading@11: { yading@11: const char *p = line; yading@11: yading@11: if (av_strstart(p, "ASMRuleBook:string;", &p)) yading@11: real_parse_asm_rulebook(s, s->streams[stream_index], p); yading@11: } yading@11: yading@11: static PayloadContext * yading@11: rdt_new_context (void) yading@11: { yading@11: PayloadContext *rdt = av_mallocz(sizeof(PayloadContext)); yading@11: yading@11: int ret = avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL); yading@11: if (ret < 0) { yading@11: av_free(rdt); yading@11: return NULL; yading@11: } yading@11: yading@11: return rdt; yading@11: } yading@11: yading@11: static void yading@11: rdt_free_context (PayloadContext *rdt) yading@11: { yading@11: int i; yading@11: yading@11: for (i = 0; i < rdt->nb_rmst; i++) yading@11: if (rdt->rmst[i]) { yading@11: ff_rm_free_rmstream(rdt->rmst[i]); yading@11: av_freep(&rdt->rmst[i]); yading@11: } yading@11: if (rdt->rmctx) yading@11: avformat_close_input(&rdt->rmctx); yading@11: av_freep(&rdt->mlti_data); yading@11: av_freep(&rdt->rmst); yading@11: av_free(rdt); yading@11: } yading@11: yading@11: #define RDT_HANDLER(n, s, t) \ yading@11: static RTPDynamicProtocolHandler ff_rdt_ ## n ## _handler = { \ yading@11: .enc_name = s, \ yading@11: .codec_type = t, \ yading@11: .codec_id = AV_CODEC_ID_NONE, \ yading@11: .parse_sdp_a_line = rdt_parse_sdp_line, \ yading@11: .alloc = rdt_new_context, \ yading@11: .free = rdt_free_context, \ yading@11: .parse_packet = rdt_parse_packet \ yading@11: } yading@11: yading@11: RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO); yading@11: RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO); yading@11: RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO); yading@11: RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO); yading@11: yading@11: void av_register_rdt_dynamic_payload_handlers(void) yading@11: { yading@11: ff_register_dynamic_payload_handler(&ff_rdt_video_handler); yading@11: ff_register_dynamic_payload_handler(&ff_rdt_audio_handler); yading@11: ff_register_dynamic_payload_handler(&ff_rdt_live_video_handler); yading@11: ff_register_dynamic_payload_handler(&ff_rdt_live_audio_handler); yading@11: }