rtsp: Check the RTCP file handle for new packets, too
[libav.git] / libavformat / rtpdec.c
CommitLineData
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1/*
2 * RTP input format
406792e7 3 * Copyright (c) 2002 Fabrice Bellard
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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 */
245976da 21
7246177d 22/* needed for gethostname() */
d0feff2a 23#define _XOPEN_SOURCE 600
7246177d 24
9106a698 25#include "libavcodec/get_bits.h"
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26#include "avformat.h"
27#include "mpegts.h"
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28
29#include <unistd.h>
30#include "network.h"
31
302879cb 32#include "rtpdec.h"
965a3ddb 33#include "rtpdec_formats.h"
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34
35//#define DEBUG
36
37/* TODO: - add RTCP statistics reporting (should be optional).
38
39 - add support for h263/mpeg4 packetized output : IDEA: send a
40 buffer to 'rtp_write_packet' contains all the packets for ONE
41 frame. Each packet should have a four byte header containing
42 the length in big endian format (same trick as
43 'url_open_dyn_packet_buf')
44*/
45
46/* statistics functions */
47RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler= NULL;
48
0369d2b0 49void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
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50{
51 handler->next= RTPFirstDynamicPayloadHandler;
52 RTPFirstDynamicPayloadHandler= handler;
53}
54
55void av_register_rtp_dynamic_payload_handlers(void)
56{
9b3788ef
JA
57 ff_register_dynamic_payload_handler(&ff_mp4v_es_dynamic_handler);
58 ff_register_dynamic_payload_handler(&ff_mpeg4_generic_dynamic_handler);
556aa7a1
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59 ff_register_dynamic_payload_handler(&ff_amr_nb_dynamic_handler);
60 ff_register_dynamic_payload_handler(&ff_amr_wb_dynamic_handler);
45aa9080
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61 ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
62 ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
0369d2b0 63 ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
e6327fba 64 ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
887af2aa 65 ff_register_dynamic_payload_handler(&ff_theora_dynamic_handler);
a59096e4 66 ff_register_dynamic_payload_handler(&ff_qdm2_dynamic_handler);
4449df6b 67 ff_register_dynamic_payload_handler(&ff_svq3_dynamic_handler);
1ddc176e 68 ff_register_dynamic_payload_handler(&ff_mp4a_latm_dynamic_handler);
51291e60 69 ff_register_dynamic_payload_handler(&ff_vp8_dynamic_handler);
e9fce261
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70
71 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
72 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfa_handler);
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73}
74
75static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf, int len)
76{
7f3468d3 77 if (buf[1] != RTCP_SR)
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78 return -1;
79 s->last_rtcp_ntp_time = AV_RB64(buf + 8);
2cab6b48
MS
80 if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE)
81 s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
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82 s->last_rtcp_timestamp = AV_RB32(buf + 16);
83 return 0;
84}
85
86#define RTP_SEQ_MOD (1<<16)
87
88/**
89* called on parse open packet
90*/
91static void rtp_init_statistics(RTPStatistics *s, uint16_t base_sequence) // called on parse open packet.
92{
93 memset(s, 0, sizeof(RTPStatistics));
94 s->max_seq= base_sequence;
95 s->probation= 1;
96}
97
98/**
99* called whenever there is a large jump in sequence numbers, or when they get out of probation...
100*/
101static void rtp_init_sequence(RTPStatistics *s, uint16_t seq)
102{
103 s->max_seq= seq;
104 s->cycles= 0;
105 s->base_seq= seq -1;
106 s->bad_seq= RTP_SEQ_MOD + 1;
107 s->received= 0;
108 s->expected_prior= 0;
109 s->received_prior= 0;
110 s->jitter= 0;
111 s->transit= 0;
112}
113
114/**
115* returns 1 if we should handle this packet.
116*/
117static int rtp_valid_packet_in_sequence(RTPStatistics *s, uint16_t seq)
118{
119 uint16_t udelta= seq - s->max_seq;
120 const int MAX_DROPOUT= 3000;
121 const int MAX_MISORDER = 100;
122 const int MIN_SEQUENTIAL = 2;
123
124 /* source not valid until MIN_SEQUENTIAL packets with sequence seq. numbers have been received */
125 if(s->probation)
126 {
127 if(seq==s->max_seq + 1) {
128 s->probation--;
129 s->max_seq= seq;
130 if(s->probation==0) {
131 rtp_init_sequence(s, seq);
132 s->received++;
133 return 1;
134 }
135 } else {
136 s->probation= MIN_SEQUENTIAL - 1;
137 s->max_seq = seq;
138 }
139 } else if (udelta < MAX_DROPOUT) {
140 // in order, with permissible gap
141 if(seq < s->max_seq) {
142 //sequence number wrapped; count antother 64k cycles
143 s->cycles += RTP_SEQ_MOD;
144 }
145 s->max_seq= seq;
146 } else if (udelta <= RTP_SEQ_MOD - MAX_MISORDER) {
147 // sequence made a large jump...
148 if(seq==s->bad_seq) {
149 // two sequential packets-- assume that the other side restarted without telling us; just resync.
150 rtp_init_sequence(s, seq);
151 } else {
152 s->bad_seq= (seq + 1) & (RTP_SEQ_MOD-1);
153 return 0;
154 }
155 } else {
156 // duplicate or reordered packet...
157 }
158 s->received++;
159 return 1;
160}
161
162#if 0
163/**
164* This function is currently unused; without a valid local ntp time, I don't see how we could calculate the
165* difference between the arrival and sent timestamp. As a result, the jitter and transit statistics values
166* never change. I left this in in case someone else can see a way. (rdm)
167*/
168static void rtcp_update_jitter(RTPStatistics *s, uint32_t sent_timestamp, uint32_t arrival_timestamp)
169{
170 uint32_t transit= arrival_timestamp - sent_timestamp;
171 int d;
172 s->transit= transit;
173 d= FFABS(transit - s->transit);
174 s->jitter += d - ((s->jitter + 8)>>4);
175}
176#endif
177
178int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
179{
180 ByteIOContext *pb;
181 uint8_t *buf;
182 int len;
183 int rtcp_bytes;
184 RTPStatistics *stats= &s->statistics;
185 uint32_t lost;
186 uint32_t extended_max;
187 uint32_t expected_interval;
188 uint32_t received_interval;
189 uint32_t lost_interval;
190 uint32_t expected;
191 uint32_t fraction;
192 uint64_t ntp_time= s->last_rtcp_ntp_time; // TODO: Get local ntp time?
193
194 if (!s->rtp_ctx || (count < 1))
195 return -1;
196
197 /* TODO: I think this is way too often; RFC 1889 has algorithm for this */
198 /* XXX: mpeg pts hardcoded. RTCP send every 0.5 seconds */
199 s->octet_count += count;
200 rtcp_bytes = ((s->octet_count - s->last_octet_count) * RTCP_TX_RATIO_NUM) /
201 RTCP_TX_RATIO_DEN;
202 rtcp_bytes /= 50; // mmu_man: that's enough for me... VLC sends much less btw !?
203 if (rtcp_bytes < 28)
204 return -1;
205 s->last_octet_count = s->octet_count;
206
207 if (url_open_dyn_buf(&pb) < 0)
208 return -1;
209
210 // Receiver Report
211 put_byte(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
7f3468d3 212 put_byte(pb, RTCP_RR);
8eb793c4 213 put_be16(pb, 7); /* length in words - 1 */
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214 // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
215 put_be32(pb, s->ssrc + 1);
216 put_be32(pb, s->ssrc); // server SSRC
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217 // some placeholders we should really fill...
218 // RFC 1889/p64
219 extended_max= stats->cycles + stats->max_seq;
220 expected= extended_max - stats->base_seq + 1;
221 lost= expected - stats->received;
222 lost= FFMIN(lost, 0xffffff); // clamp it since it's only 24 bits...
223 expected_interval= expected - stats->expected_prior;
224 stats->expected_prior= expected;
225 received_interval= stats->received - stats->received_prior;
226 stats->received_prior= stats->received;
227 lost_interval= expected_interval - received_interval;
228 if (expected_interval==0 || lost_interval<=0) fraction= 0;
229 else fraction = (lost_interval<<8)/expected_interval;
230
231 fraction= (fraction<<24) | lost;
232
233 put_be32(pb, fraction); /* 8 bits of fraction, 24 bits of total packets lost */
234 put_be32(pb, extended_max); /* max sequence received */
235 put_be32(pb, stats->jitter>>4); /* jitter */
236
237 if(s->last_rtcp_ntp_time==AV_NOPTS_VALUE)
238 {
239 put_be32(pb, 0); /* last SR timestamp */
240 put_be32(pb, 0); /* delay since last SR */
241 } else {
242 uint32_t middle_32_bits= s->last_rtcp_ntp_time>>16; // this is valid, right? do we need to handle 64 bit values special?
243 uint32_t delay_since_last= ntp_time - s->last_rtcp_ntp_time;
244
245 put_be32(pb, middle_32_bits); /* last SR timestamp */
246 put_be32(pb, delay_since_last); /* delay since last SR */
247 }
248
249 // CNAME
250 put_byte(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
7f3468d3 251 put_byte(pb, RTCP_SDES);
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252 len = strlen(s->hostname);
253 put_be16(pb, (6 + len + 3) / 4); /* length in words - 1 */
254 put_be32(pb, s->ssrc);
255 put_byte(pb, 0x01);
256 put_byte(pb, len);
257 put_buffer(pb, s->hostname, len);
258 // padding
259 for (len = (6 + len) % 4; len % 4; len++) {
260 put_byte(pb, 0);
261 }
262
263 put_flush_packet(pb);
264 len = url_close_dyn_buf(pb, &buf);
265 if ((len > 0) && buf) {
266 int result;
e8420626 267 dprintf(s->ic, "sending %d bytes of RR\n", len);
8eb793c4 268 result= url_write(s->rtp_ctx, buf, len);
e8420626 269 dprintf(s->ic, "result from url_write: %d\n", result);
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270 av_free(buf);
271 }
272 return 0;
273}
274
9c8fa20d
MS
275void rtp_send_punch_packets(URLContext* rtp_handle)
276{
277 ByteIOContext *pb;
278 uint8_t *buf;
279 int len;
280
281 /* Send a small RTP packet */
282 if (url_open_dyn_buf(&pb) < 0)
283 return;
284
285 put_byte(pb, (RTP_VERSION << 6));
286 put_byte(pb, 0); /* Payload type */
287 put_be16(pb, 0); /* Seq */
288 put_be32(pb, 0); /* Timestamp */
289 put_be32(pb, 0); /* SSRC */
290
291 put_flush_packet(pb);
292 len = url_close_dyn_buf(pb, &buf);
293 if ((len > 0) && buf)
294 url_write(rtp_handle, buf, len);
295 av_free(buf);
296
297 /* Send a minimal RTCP RR */
298 if (url_open_dyn_buf(&pb) < 0)
299 return;
300
301 put_byte(pb, (RTP_VERSION << 6));
7f3468d3 302 put_byte(pb, RTCP_RR); /* receiver report */
9c8fa20d
MS
303 put_be16(pb, 1); /* length in words - 1 */
304 put_be32(pb, 0); /* our own SSRC */
305
306 put_flush_packet(pb);
307 len = url_close_dyn_buf(pb, &buf);
308 if ((len > 0) && buf)
309 url_write(rtp_handle, buf, len);
310 av_free(buf);
311}
312
313
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314/**
315 * open a new RTP parse context for stream 'st'. 'st' can be NULL for
316 * MPEG2TS streams to indicate that they should be demuxed inside the
317 * rtp demux (otherwise CODEC_ID_MPEG2TS packets are returned)
8eb793c4 318 */
ca937a55 319RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type)
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320{
321 RTPDemuxContext *s;
322
323 s = av_mallocz(sizeof(RTPDemuxContext));
324 if (!s)
325 return NULL;
326 s->payload_type = payload_type;
327 s->last_rtcp_ntp_time = AV_NOPTS_VALUE;
2cab6b48 328 s->first_rtcp_ntp_time = AV_NOPTS_VALUE;
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329 s->ic = s1;
330 s->st = st;
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331 rtp_init_statistics(&s->statistics, 0); // do we know the initial sequence from sdp?
332 if (!strcmp(ff_rtp_enc_name(payload_type), "MP2T")) {
9125806e 333 s->ts = ff_mpegts_parse_open(s->ic);
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334 if (s->ts == NULL) {
335 av_free(s);
336 return NULL;
337 }
338 } else {
26efefc5 339 av_set_pts_info(st, 32, 1, 90000);
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340 switch(st->codec->codec_id) {
341 case CODEC_ID_MPEG1VIDEO:
342 case CODEC_ID_MPEG2VIDEO:
343 case CODEC_ID_MP2:
344 case CODEC_ID_MP3:
345 case CODEC_ID_MPEG4:
45aa9080 346 case CODEC_ID_H263:
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347 case CODEC_ID_H264:
348 st->need_parsing = AVSTREAM_PARSE_FULL;
349 break;
350 default:
72415b2a 351 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
d6b9e57a
LA
352 av_set_pts_info(st, 32, 1, st->codec->sample_rate);
353 }
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354 break;
355 }
356 }
357 // needed to send back RTCP RR in RTSP sessions
358 s->rtp_ctx = rtpc;
359 gethostname(s->hostname, sizeof(s->hostname));
360 return s;
361}
362
99a1d191
RB
363void
364rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
365 RTPDynamicProtocolHandler *handler)
366{
367 s->dynamic_protocol_context = ctx;
368 s->parse_packet = handler->parse_packet;
369}
370
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371/**
372 * This was the second switch in rtp_parse packet. Normalizes time, if required, sets stream_index, etc.
373 */
374static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestamp)
375{
d74c6145 376 if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE && timestamp != RTP_NOTS_VALUE) {
fba7815d
LA
377 int64_t addend;
378 int delta_timestamp;
379
380 /* compute pts from timestamp with received ntp_time */
381 delta_timestamp = timestamp - s->last_rtcp_timestamp;
382 /* convert to the PTS timebase */
2cab6b48 383 addend = av_rescale(s->last_rtcp_ntp_time - s->first_rtcp_ntp_time, s->st->time_base.den, (uint64_t)s->st->time_base.num << 32);
5948f822 384 pkt->pts = s->range_start_offset + addend + delta_timestamp;
fba7815d 385 }
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386}
387
388/**
389 * Parse an RTP or RTCP packet directly sent as a buffer.
390 * @param s RTP parse context.
391 * @param pkt returned packet
392 * @param buf input buffer or NULL to read the next packets
393 * @param len buffer len
394 * @return 0 if a packet is returned, 1 if a packet is returned and more can follow
395 * (use buf as NULL to read the next). -1 if no packet (error or no more packet).
396 */
397int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
398 const uint8_t *buf, int len)
399{
400 unsigned int ssrc, h;
f841a0fc 401 int payload_type, seq, ret, flags = 0;
8eb793c4
LA
402 AVStream *st;
403 uint32_t timestamp;
404 int rv= 0;
405
406 if (!buf) {
407 /* return the next packets, if any */
408 if(s->st && s->parse_packet) {
d74c6145
MS
409 /* timestamp should be overwritten by parse_packet, if not,
410 * the packet is left with pts == AV_NOPTS_VALUE */
411 timestamp = RTP_NOTS_VALUE;
1a45a9f4 412 rv= s->parse_packet(s->ic, s->dynamic_protocol_context,
9b932b8a 413 s->st, pkt, &timestamp, NULL, 0, flags);
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414 finalize_packet(s, pkt, timestamp);
415 return rv;
416 } else {
417 // TODO: Move to a dynamic packet handler (like above)
418 if (s->read_buf_index >= s->read_buf_size)
419 return -1;
9125806e 420 ret = ff_mpegts_parse_packet(s->ts, pkt, s->buf + s->read_buf_index,
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421 s->read_buf_size - s->read_buf_index);
422 if (ret < 0)
423 return -1;
424 s->read_buf_index += ret;
425 if (s->read_buf_index < s->read_buf_size)
426 return 1;
427 else
428 return 0;
429 }
430 }
431
432 if (len < 12)
433 return -1;
434
435 if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
436 return -1;
7f3468d3 437 if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) {
8eb793c4
LA
438 rtcp_parse_packet(s, buf, len);
439 return -1;
440 }
441 payload_type = buf[1] & 0x7f;
144ae29d
RB
442 if (buf[1] & 0x80)
443 flags |= RTP_FLAG_MARKER;
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LA
444 seq = AV_RB16(buf + 2);
445 timestamp = AV_RB32(buf + 4);
446 ssrc = AV_RB32(buf + 8);
447 /* store the ssrc in the RTPDemuxContext */
448 s->ssrc = ssrc;
449
450 /* NOTE: we can handle only one payload type */
451 if (s->payload_type != payload_type)
452 return -1;
453
454 st = s->st;
455 // only do something with this if all the rtp checks pass...
456 if(!rtp_valid_packet_in_sequence(&s->statistics, seq))
457 {
458 av_log(st?st->codec:NULL, AV_LOG_ERROR, "RTP: PT=%02x: bad cseq %04x expected=%04x\n",
459 payload_type, seq, ((s->seq + 1) & 0xffff));
460 return -1;
461 }
462
463 s->seq = seq;
464 len -= 12;
465 buf += 12;
466
467 if (!st) {
468 /* specific MPEG2TS demux support */
9125806e 469 ret = ff_mpegts_parse_packet(s->ts, pkt, buf, len);
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470 if (ret < 0)
471 return -1;
472 if (ret < len) {
473 s->read_buf_size = len - ret;
474 memcpy(s->buf, buf + ret, s->read_buf_size);
475 s->read_buf_index = 0;
476 return 1;
477 }
f3e71942 478 return 0;
b4e3330c 479 } else if (s->parse_packet) {
1a45a9f4 480 rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
9b932b8a 481 s->st, pkt, &timestamp, buf, len, flags);
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LA
482 } else {
483 // at this point, the RTP header has been stripped; This is ASSUMING that there is only 1 CSRC, which in't wise.
484 switch(st->codec->codec_id) {
485 case CODEC_ID_MP2:
76faff6e 486 case CODEC_ID_MP3:
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LA
487 /* better than nothing: skip mpeg audio RTP header */
488 if (len <= 4)
489 return -1;
490 h = AV_RB32(buf);
491 len -= 4;
492 buf += 4;
493 av_new_packet(pkt, len);
494 memcpy(pkt->data, buf, len);
495 break;
496 case CODEC_ID_MPEG1VIDEO:
497 case CODEC_ID_MPEG2VIDEO:
498 /* better than nothing: skip mpeg video RTP header */
499 if (len <= 4)
500 return -1;
501 h = AV_RB32(buf);
502 buf += 4;
503 len -= 4;
504 if (h & (1 << 26)) {
505 /* mpeg2 */
506 if (len <= 4)
507 return -1;
508 buf += 4;
509 len -= 4;
510 }
511 av_new_packet(pkt, len);
512 memcpy(pkt->data, buf, len);
513 break;
8eb793c4 514 default:
f739b36d
RB
515 av_new_packet(pkt, len);
516 memcpy(pkt->data, buf, len);
8eb793c4
LA
517 break;
518 }
eafb17d1
RB
519
520 pkt->stream_index = st->index;
f3e71942 521 }
8eb793c4 522
95f03cf3
RB
523 // now perform timestamp things....
524 finalize_packet(s, pkt, timestamp);
f3e71942 525
8eb793c4
LA
526 return rv;
527}
528
529void rtp_parse_close(RTPDemuxContext *s)
530{
8eb793c4 531 if (!strcmp(ff_rtp_enc_name(s->payload_type), "MP2T")) {
9125806e 532 ff_mpegts_parse_close(s->ts);
8eb793c4
LA
533 }
534 av_free(s);
535}
016bc031
JA
536
537int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
538 int (*parse_fmtp)(AVStream *stream,
539 PayloadContext *data,
540 char *attr, char *value))
541{
542 char attr[256];
824535e3 543 char *value;
016bc031 544 int res;
824535e3
JA
545 int value_size = strlen(p) + 1;
546
547 if (!(value = av_malloc(value_size))) {
548 av_log(stream, AV_LOG_ERROR, "Failed to allocate data for FMTP.");
549 return AVERROR(ENOMEM);
550 }
016bc031
JA
551
552 // remove protocol identifier
553 while (*p && *p == ' ') p++; // strip spaces
554 while (*p && *p != ' ') p++; // eat protocol identifier
555 while (*p && *p == ' ') p++; // strip trailing spaces
556
557 while (ff_rtsp_next_attr_and_value(&p,
558 attr, sizeof(attr),
824535e3 559 value, value_size)) {
016bc031
JA
560
561 res = parse_fmtp(stream, data, attr, value);
824535e3
JA
562 if (res < 0 && res != AVERROR_PATCHWELCOME) {
563 av_free(value);
016bc031 564 return res;
824535e3 565 }
016bc031 566 }
824535e3 567 av_free(value);
016bc031
JA
568 return 0;
569}