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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 identifical 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 | ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx, | |
56 | void *priv_data, RTPDynamicProtocolHandler *handler) | |
57 | { | |
58 | RDTDemuxContext *s = av_mallocz(sizeof(RDTDemuxContext)); | |
59 | if (!s) | |
60 | return NULL; | |
61 | ||
62 | s->ic = ic; | |
63 | s->streams = &ic->streams[first_stream_of_set_idx]; | |
64 | do { | |
65 | s->n_streams++; | |
66 | } while (first_stream_of_set_idx + s->n_streams < ic->nb_streams && | |
67 | s->streams[s->n_streams]->id == s->streams[0]->id); | |
68 | s->prev_set_id = -1; | |
69 | s->prev_stream_id = -1; | |
70 | s->prev_timestamp = -1; | |
71 | s->parse_packet = handler ? handler->parse_packet : NULL; | |
72 | s->dynamic_protocol_context = priv_data; | |
73 | ||
74 | return s; | |
75 | } | |
76 | ||
77 | void | |
78 | ff_rdt_parse_close(RDTDemuxContext *s) | |
79 | { | |
80 | av_free(s); | |
81 | } | |
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 + FF_INPUT_BUFFER_PADDING_SIZE]; | |
90 | int audio_pkt_cnt; /**< remaining audio packets in rmdec */ | |
91 | }; | |
92 | ||
93 | void | |
94 | ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], | |
95 | const char *challenge) | |
96 | { | |
97 | int ch_len = strlen (challenge), i; | |
98 | unsigned char zres[16], | |
99 | 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 | if (ch_len == 40) /* what a hack... */ | |
110 | ch_len = 32; | |
111 | else if (ch_len > 56) | |
112 | ch_len = 56; | |
113 | memcpy(buf + 8, challenge, ch_len); | |
114 | ||
115 | /* xor challenge bytewise with xor_table */ | |
116 | for (i = 0; i < XOR_TABLE_SIZE; i++) | |
117 | buf[8 + i] ^= xor_table[i]; | |
118 | ||
119 | av_md5_sum(zres, buf, 64); | |
120 | ff_data_to_hex(response, zres, 16, 1); | |
121 | ||
122 | /* add tail */ | |
123 | strcpy (response + 32, "01d0a8e3"); | |
124 | ||
125 | /* calculate checksum */ | |
126 | for (i = 0; i < 8; i++) | |
127 | chksum[i] = response[i * 4]; | |
128 | chksum[8] = 0; | |
129 | } | |
130 | ||
131 | static int | |
132 | rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr) | |
133 | { | |
134 | AVIOContext pb; | |
135 | 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 | if (!rdt->mlti_data) | |
153 | return -1; | |
154 | ffio_init_context(&pb, rdt->mlti_data, rdt->mlti_data_size, 0, | |
155 | NULL, NULL, NULL, NULL); | |
156 | tag = avio_rl32(&pb); | |
157 | if (tag == MKTAG('M', 'L', 'T', 'I')) { | |
158 | int num, chunk_nr; | |
159 | ||
160 | /* read index of MDPR chunk numbers */ | |
161 | num = avio_rb16(&pb); | |
162 | if (rule_nr < 0 || rule_nr >= num) | |
163 | return -1; | |
164 | avio_skip(&pb, rule_nr * 2); | |
165 | chunk_nr = avio_rb16(&pb); | |
166 | avio_skip(&pb, (num - 1 - rule_nr) * 2); | |
167 | ||
168 | /* read MDPR chunks */ | |
169 | num = avio_rb16(&pb); | |
170 | if (chunk_nr >= num) | |
171 | return -1; | |
172 | while (chunk_nr--) | |
173 | avio_skip(&pb, avio_rb32(&pb)); | |
174 | size = avio_rb32(&pb); | |
175 | } else { | |
176 | size = rdt->mlti_data_size; | |
177 | avio_seek(&pb, 0, SEEK_SET); | |
178 | } | |
179 | if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, rdt->rmst[st->index], size, NULL) < 0) | |
180 | return -1; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | /** | |
186 | * Actual data handling. | |
187 | */ | |
188 | ||
189 | int | |
190 | 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 | 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 | while (len >= 5 && buf[1] == 0xFF /* status packet */) { | |
201 | int pkt_len; | |
202 | ||
203 | if (!(buf[0] & 0x80)) | |
204 | return -1; /* not followed by a data packet */ | |
205 | ||
206 | pkt_len = AV_RB16(buf+3); | |
207 | buf += pkt_len; | |
208 | len -= pkt_len; | |
209 | consumed += pkt_len; | |
210 | } | |
211 | if (len < 16) | |
212 | 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 | init_get_bits(&gb, buf, len << 3); | |
265 | len_included = get_bits1(&gb); | |
266 | need_reliable = get_bits1(&gb); | |
267 | set_id = get_bits(&gb, 5); | |
268 | skip_bits(&gb, 1); | |
269 | seq_no = get_bits(&gb, 16); | |
270 | if (len_included) | |
271 | skip_bits(&gb, 16); | |
272 | skip_bits(&gb, 2); | |
273 | stream_id = get_bits(&gb, 5); | |
274 | is_keyframe = !get_bits1(&gb); | |
275 | timestamp = get_bits_long(&gb, 32); | |
276 | if (set_id == 0x1f) | |
277 | set_id = get_bits(&gb, 16); | |
278 | if (need_reliable) | |
279 | skip_bits(&gb, 16); | |
280 | if (stream_id == 0x1f) | |
281 | stream_id = get_bits(&gb, 16); | |
282 | ||
283 | if (pset_id) *pset_id = set_id; | |
284 | if (pseq_no) *pseq_no = seq_no; | |
285 | if (pstream_id) *pstream_id = stream_id; | |
286 | if (pis_keyframe) *pis_keyframe = is_keyframe; | |
287 | if (ptimestamp) *ptimestamp = timestamp; | |
288 | ||
289 | 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 | 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 | int seq = 1, res; | |
299 | AVIOContext pb; | |
300 | ||
301 | if (rdt->audio_pkt_cnt == 0) { | |
302 | int pos; | |
303 | ||
304 | ffio_init_context(&pb, (uint8_t *)buf, len, 0, NULL, NULL, NULL, NULL); | |
305 | flags = (flags & RTP_FLAG_KEY) ? 2 : 0; | |
306 | res = ff_rm_parse_packet (rdt->rmctx, &pb, st, rdt->rmst[st->index], len, pkt, | |
307 | &seq, flags, *timestamp); | |
308 | pos = avio_tell(&pb); | |
309 | if (res < 0) | |
310 | return res; | |
311 | if (res > 0) { | |
312 | if (st->codec->codec_id == AV_CODEC_ID_AAC) { | |
313 | memcpy (rdt->buffer, buf + pos, len - pos); | |
314 | rdt->rmctx->pb = avio_alloc_context (rdt->buffer, len - pos, 0, | |
315 | NULL, NULL, NULL, NULL); | |
316 | } | |
317 | goto get_cache; | |
318 | } | |
319 | } else { | |
320 | get_cache: | |
321 | rdt->audio_pkt_cnt = | |
322 | ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb, | |
323 | st, rdt->rmst[st->index], pkt); | |
324 | if (rdt->audio_pkt_cnt == 0 && | |
325 | st->codec->codec_id == AV_CODEC_ID_AAC) | |
326 | av_freep(&rdt->rmctx->pb); | |
327 | } | |
328 | pkt->stream_index = st->index; | |
329 | pkt->pts = *timestamp; | |
330 | ||
331 | return rdt->audio_pkt_cnt > 0; | |
332 | } | |
333 | ||
334 | int | |
335 | ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, | |
336 | uint8_t **bufptr, int len) | |
337 | { | |
338 | uint8_t *buf = bufptr ? *bufptr : NULL; | |
339 | int seq_no, flags = 0, stream_id, set_id, is_keyframe; | |
340 | uint32_t timestamp; | |
341 | int rv= 0; | |
342 | ||
343 | if (!s->parse_packet) | |
344 | return -1; | |
345 | ||
346 | if (!buf && s->prev_stream_id != -1) { | |
347 | /* return the next packets, if any */ | |
348 | timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned.... | |
349 | rv= s->parse_packet(s->ic, s->dynamic_protocol_context, | |
350 | s->streams[s->prev_stream_id], | |
351 | pkt, ×tamp, NULL, 0, 0, flags); | |
352 | return rv; | |
353 | } | |
354 | ||
355 | if (len < 12) | |
356 | return -1; | |
357 | rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, ×tamp); | |
358 | if (rv < 0) | |
359 | return rv; | |
360 | if (is_keyframe && | |
361 | (set_id != s->prev_set_id || timestamp != s->prev_timestamp || | |
362 | stream_id != s->prev_stream_id)) { | |
363 | flags |= RTP_FLAG_KEY; | |
364 | s->prev_set_id = set_id; | |
365 | s->prev_timestamp = timestamp; | |
366 | } | |
367 | s->prev_stream_id = stream_id; | |
368 | buf += rv; | |
369 | len -= rv; | |
370 | ||
371 | if (s->prev_stream_id >= s->n_streams) { | |
372 | s->prev_stream_id = -1; | |
373 | return -1; | |
374 | } | |
375 | ||
376 | rv = s->parse_packet(s->ic, s->dynamic_protocol_context, | |
377 | s->streams[s->prev_stream_id], | |
378 | pkt, ×tamp, buf, len, 0, flags); | |
379 | ||
380 | return rv; | |
381 | } | |
382 | ||
383 | void | |
384 | ff_rdt_subscribe_rule (char *cmd, int size, | |
385 | int stream_nr, int rule_nr) | |
386 | { | |
387 | av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d", | |
388 | stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1); | |
389 | } | |
390 | ||
391 | static unsigned char * | |
392 | rdt_parse_b64buf (unsigned int *target_len, const char *p) | |
393 | { | |
394 | unsigned char *target; | |
395 | int len = strlen(p); | |
396 | if (*p == '\"') { | |
397 | p++; | |
398 | len -= 2; /* skip embracing " at start/end */ | |
399 | } | |
400 | *target_len = len * 3 / 4; | |
401 | target = av_mallocz(*target_len + FF_INPUT_BUFFER_PADDING_SIZE); | |
402 | if (!target) | |
403 | return NULL; | |
404 | av_base64_decode(target, p, *target_len); | |
405 | return target; | |
406 | } | |
407 | ||
408 | static int | |
409 | rdt_parse_sdp_line (AVFormatContext *s, int st_index, | |
410 | PayloadContext *rdt, const char *line) | |
411 | { | |
412 | AVStream *stream = s->streams[st_index]; | |
413 | const char *p = line; | |
414 | ||
415 | if (av_strstart(p, "OpaqueData:buffer;", &p)) { | |
416 | rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p); | |
417 | } else if (av_strstart(p, "StartTime:integer;", &p)) | |
418 | stream->first_dts = atoi(p); | |
419 | else if (av_strstart(p, "ASMRuleBook:string;", &p)) { | |
420 | int n, first = -1; | |
421 | ||
422 | for (n = 0; n < s->nb_streams; n++) | |
423 | if (s->streams[n]->id == stream->id) { | |
424 | int count = s->streams[n]->index + 1, err; | |
425 | if (first == -1) first = n; | |
426 | if (rdt->nb_rmst < count) { | |
427 | if ((err = av_reallocp(&rdt->rmst, | |
428 | count * sizeof(*rdt->rmst))) < 0) { | |
429 | rdt->nb_rmst = 0; | |
430 | return err; | |
431 | } | |
432 | memset(rdt->rmst + rdt->nb_rmst, 0, | |
433 | (count - rdt->nb_rmst) * sizeof(*rdt->rmst)); | |
434 | rdt->nb_rmst = count; | |
435 | } | |
436 | rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream(); | |
437 | rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2); | |
438 | } | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static void | |
445 | real_parse_asm_rule(AVStream *st, const char *p, const char *end) | |
446 | { | |
447 | do { | |
448 | /* can be either averagebandwidth= or AverageBandwidth= */ | |
449 | if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%d", &st->codec->bit_rate) == 1) | |
450 | break; | |
451 | if (!(p = strchr(p, ',')) || p > end) | |
452 | p = end; | |
453 | p++; | |
454 | } while (p < end); | |
455 | } | |
456 | ||
457 | static AVStream * | |
458 | add_dstream(AVFormatContext *s, AVStream *orig_st) | |
459 | { | |
460 | AVStream *st; | |
461 | ||
462 | if (!(st = avformat_new_stream(s, NULL))) | |
463 | return NULL; | |
464 | st->id = orig_st->id; | |
465 | st->codec->codec_type = orig_st->codec->codec_type; | |
466 | st->first_dts = orig_st->first_dts; | |
467 | ||
468 | return st; | |
469 | } | |
470 | ||
471 | static void | |
472 | real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, | |
473 | const char *p) | |
474 | { | |
475 | const char *end; | |
476 | int n_rules = 0, odd = 0; | |
477 | AVStream *st; | |
478 | ||
479 | /** | |
480 | * The ASMRuleBook contains a list of comma-separated strings per rule, | |
481 | * and each rule is separated by a ;. The last one also has a ; at the | |
482 | * end so we can use it as delimiter. | |
483 | * Every rule occurs twice, once for when the RTSP packet header marker | |
484 | * is set and once for if it isn't. We only read the first because we | |
485 | * don't care much (that's what the "odd" variable is for). | |
486 | * Each rule contains a set of one or more statements, optionally | |
487 | * preceded by a single condition. If there's a condition, the rule | |
488 | * starts with a '#'. Multiple conditions are merged between brackets, | |
489 | * so there are never multiple conditions spread out over separate | |
490 | * statements. Generally, these conditions are bitrate limits (min/max) | |
491 | * for multi-bitrate streams. | |
492 | */ | |
493 | if (*p == '\"') p++; | |
494 | while (1) { | |
495 | if (!(end = strchr(p, ';'))) | |
496 | break; | |
497 | if (!odd && end != p) { | |
498 | if (n_rules > 0) | |
499 | st = add_dstream(s, orig_st); | |
500 | else | |
501 | st = orig_st; | |
502 | if (!st) | |
503 | break; | |
504 | real_parse_asm_rule(st, p, end); | |
505 | n_rules++; | |
506 | } | |
507 | p = end + 1; | |
508 | odd ^= 1; | |
509 | } | |
510 | } | |
511 | ||
512 | void | |
513 | ff_real_parse_sdp_a_line (AVFormatContext *s, int stream_index, | |
514 | const char *line) | |
515 | { | |
516 | const char *p = line; | |
517 | ||
518 | if (av_strstart(p, "ASMRuleBook:string;", &p)) | |
519 | real_parse_asm_rulebook(s, s->streams[stream_index], p); | |
520 | } | |
521 | ||
522 | static PayloadContext * | |
523 | rdt_new_context (void) | |
524 | { | |
525 | PayloadContext *rdt = av_mallocz(sizeof(PayloadContext)); | |
2ba45a60 DM |
526 | if (!rdt) |
527 | return NULL; | |
f6fa7814 DM |
528 | |
529 | rdt->rmctx = avformat_alloc_context(); | |
530 | if (!rdt->rmctx) | |
531 | av_freep(&rdt); | |
2ba45a60 DM |
532 | |
533 | return rdt; | |
534 | } | |
535 | ||
f6fa7814 DM |
536 | static int |
537 | rdt_init_context (AVFormatContext *s, int st_index, PayloadContext *rdt) | |
538 | { | |
539 | int ret; | |
540 | ||
541 | if ((ret = ff_copy_whitelists(rdt->rmctx, s)) < 0) | |
542 | return ret; | |
543 | ||
544 | return avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL); | |
545 | } | |
546 | ||
2ba45a60 DM |
547 | static void |
548 | rdt_free_context (PayloadContext *rdt) | |
549 | { | |
550 | int i; | |
551 | ||
552 | for (i = 0; i < rdt->nb_rmst; i++) | |
553 | if (rdt->rmst[i]) { | |
554 | ff_rm_free_rmstream(rdt->rmst[i]); | |
555 | av_freep(&rdt->rmst[i]); | |
556 | } | |
557 | if (rdt->rmctx) | |
558 | avformat_close_input(&rdt->rmctx); | |
559 | av_freep(&rdt->mlti_data); | |
560 | av_freep(&rdt->rmst); | |
561 | av_free(rdt); | |
562 | } | |
563 | ||
564 | #define RDT_HANDLER(n, s, t) \ | |
565 | static RTPDynamicProtocolHandler rdt_ ## n ## _handler = { \ | |
566 | .enc_name = s, \ | |
567 | .codec_type = t, \ | |
568 | .codec_id = AV_CODEC_ID_NONE, \ | |
569 | .parse_sdp_a_line = rdt_parse_sdp_line, \ | |
570 | .alloc = rdt_new_context, \ | |
f6fa7814 | 571 | .init = rdt_init_context, \ |
2ba45a60 DM |
572 | .free = rdt_free_context, \ |
573 | .parse_packet = rdt_parse_packet \ | |
574 | } | |
575 | ||
576 | RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO); | |
577 | RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO); | |
578 | RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO); | |
579 | RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO); | |
580 | ||
581 | void ff_register_rdt_dynamic_payload_handlers(void) | |
582 | { | |
583 | ff_register_dynamic_payload_handler(&rdt_video_handler); | |
584 | ff_register_dynamic_payload_handler(&rdt_audio_handler); | |
585 | ff_register_dynamic_payload_handler(&rdt_live_video_handler); | |
586 | ff_register_dynamic_payload_handler(&rdt_live_audio_handler); | |
587 | } |