rtpdec: Fix the calculation of expected number of packets
[libav.git] / libavformat / rtpdec.c
CommitLineData
8eb793c4
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1/*
2 * RTP input format
406792e7 3 * Copyright (c) 2002 Fabrice Bellard
8eb793c4 4 *
2912e87a 5 * This file is part of Libav.
8eb793c4 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
245976da 21
0ebcdf5c 22#include "libavutil/mathematics.h"
bb3244de 23#include "libavutil/avstring.h"
c4ef6a3e 24#include "libavutil/time.h"
9106a698 25#include "libavcodec/get_bits.h"
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26#include "avformat.h"
27#include "mpegts.h"
8eb793c4 28#include "network.h"
5d471b73 29#include "url.h"
302879cb 30#include "rtpdec.h"
965a3ddb 31#include "rtpdec_formats.h"
8eb793c4 32
86d9181c
MS
33#define MIN_FEEDBACK_INTERVAL 200000 /* 200 ms in us */
34
69673138 35static RTPDynamicProtocolHandler realmedia_mp3_dynamic_handler = {
5d471b73
MS
36 .enc_name = "X-MP3-draft-00",
37 .codec_type = AVMEDIA_TYPE_AUDIO,
38 .codec_id = AV_CODEC_ID_MP3ADU,
2eeefe20
MS
39};
40
b6bf1490 41static RTPDynamicProtocolHandler speex_dynamic_handler = {
5d471b73
MS
42 .enc_name = "speex",
43 .codec_type = AVMEDIA_TYPE_AUDIO,
44 .codec_id = AV_CODEC_ID_SPEEX,
b6bf1490
DS
45};
46
c136a813 47static RTPDynamicProtocolHandler opus_dynamic_handler = {
5d471b73
MS
48 .enc_name = "opus",
49 .codec_type = AVMEDIA_TYPE_AUDIO,
50 .codec_id = AV_CODEC_ID_OPUS,
c136a813
MS
51};
52
8eb793c4 53/* statistics functions */
0d85663a 54static RTPDynamicProtocolHandler *rtp_first_dynamic_payload_handler = NULL;
8eb793c4 55
0369d2b0 56void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
8eb793c4 57{
0d85663a
MS
58 handler->next = rtp_first_dynamic_payload_handler;
59 rtp_first_dynamic_payload_handler = handler;
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LA
60}
61
62void av_register_rtp_dynamic_payload_handlers(void)
63{
9b3788ef
JA
64 ff_register_dynamic_payload_handler(&ff_mp4v_es_dynamic_handler);
65 ff_register_dynamic_payload_handler(&ff_mpeg4_generic_dynamic_handler);
556aa7a1
RB
66 ff_register_dynamic_payload_handler(&ff_amr_nb_dynamic_handler);
67 ff_register_dynamic_payload_handler(&ff_amr_wb_dynamic_handler);
45aa9080
RB
68 ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
69 ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
08bddfcd 70 ff_register_dynamic_payload_handler(&ff_h263_rfc2190_dynamic_handler);
0369d2b0 71 ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
89c39605 72 ff_register_dynamic_payload_handler(&ff_ilbc_dynamic_handler);
3c198154 73 ff_register_dynamic_payload_handler(&ff_jpeg_dynamic_handler);
e6327fba 74 ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
887af2aa 75 ff_register_dynamic_payload_handler(&ff_theora_dynamic_handler);
a59096e4 76 ff_register_dynamic_payload_handler(&ff_qdm2_dynamic_handler);
4449df6b 77 ff_register_dynamic_payload_handler(&ff_svq3_dynamic_handler);
1ddc176e 78 ff_register_dynamic_payload_handler(&ff_mp4a_latm_dynamic_handler);
51291e60 79 ff_register_dynamic_payload_handler(&ff_vp8_dynamic_handler);
35014efc 80 ff_register_dynamic_payload_handler(&ff_qcelp_dynamic_handler);
69673138 81 ff_register_dynamic_payload_handler(&realmedia_mp3_dynamic_handler);
b6bf1490 82 ff_register_dynamic_payload_handler(&speex_dynamic_handler);
c136a813 83 ff_register_dynamic_payload_handler(&opus_dynamic_handler);
e9fce261
RB
84
85 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
86 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfa_handler);
3ece3e4c
MS
87
88 ff_register_dynamic_payload_handler(&ff_qt_rtp_aud_handler);
89 ff_register_dynamic_payload_handler(&ff_qt_rtp_vid_handler);
90 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_aud_handler);
91 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_vid_handler);
06d7325a
MS
92
93 ff_register_dynamic_payload_handler(&ff_g726_16_dynamic_handler);
94 ff_register_dynamic_payload_handler(&ff_g726_24_dynamic_handler);
95 ff_register_dynamic_payload_handler(&ff_g726_32_dynamic_handler);
96 ff_register_dynamic_payload_handler(&ff_g726_40_dynamic_handler);
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LA
97}
98
1e515c42 99RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
5d471b73 100 enum AVMediaType codec_type)
1e515c42
MS
101{
102 RTPDynamicProtocolHandler *handler;
0d85663a 103 for (handler = rtp_first_dynamic_payload_handler;
1e515c42 104 handler; handler = handler->next)
bb3244de 105 if (!av_strcasecmp(name, handler->enc_name) &&
1e515c42
MS
106 codec_type == handler->codec_type)
107 return handler;
108 return NULL;
109}
110
111RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
5d471b73 112 enum AVMediaType codec_type)
1e515c42
MS
113{
114 RTPDynamicProtocolHandler *handler;
0d85663a 115 for (handler = rtp_first_dynamic_payload_handler;
1e515c42
MS
116 handler; handler = handler->next)
117 if (handler->static_payload_id && handler->static_payload_id == id &&
118 codec_type == handler->codec_type)
119 return handler;
120 return NULL;
121}
122
5d471b73
MS
123static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf,
124 int len)
8eb793c4 125{
ff328c02 126 int payload_len;
07b77fe3
JB
127 while (len >= 4) {
128 payload_len = FFMIN(len, (AV_RB16(buf + 2) + 1) * 4);
129
ff328c02
JA
130 switch (buf[1]) {
131 case RTCP_SR:
07b77fe3 132 if (payload_len < 20) {
5d471b73
MS
133 av_log(NULL, AV_LOG_ERROR,
134 "Invalid length for RTCP SR packet\n");
ff328c02
JA
135 return AVERROR_INVALIDDATA;
136 }
ff328c02 137
5d471b73 138 s->last_rtcp_ntp_time = AV_RB64(buf + 8);
682d28a9 139 s->last_rtcp_timestamp = AV_RB32(buf + 16);
3a1cdcc7
MS
140 if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
141 s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
142 if (!s->base_timestamp)
143 s->base_timestamp = s->last_rtcp_timestamp;
144 s->rtcp_ts_offset = s->last_rtcp_timestamp - s->base_timestamp;
145 }
ff328c02 146
ff328c02 147 break;
b20359f5
JA
148 case RTCP_BYE:
149 return -RTCP_BYE;
ff328c02 150 }
07b77fe3
JB
151
152 buf += payload_len;
153 len -= payload_len;
ff328c02 154 }
b20359f5 155 return -1;
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LA
156}
157
5d471b73 158#define RTP_SEQ_MOD (1 << 16)
8eb793c4 159
48f01398 160static void rtp_init_statistics(RTPStatistics *s, uint16_t base_sequence)
8eb793c4
LA
161{
162 memset(s, 0, sizeof(RTPStatistics));
48f01398
MS
163 s->max_seq = base_sequence;
164 s->probation = 1;
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LA
165}
166
48f01398 167/*
5d471b73
MS
168 * Called whenever there is a large jump in sequence numbers,
169 * or when they get out of probation...
170 */
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171static void rtp_init_sequence(RTPStatistics *s, uint16_t seq)
172{
48f01398
MS
173 s->max_seq = seq;
174 s->cycles = 0;
175 s->base_seq = seq - 1;
176 s->bad_seq = RTP_SEQ_MOD + 1;
177 s->received = 0;
178 s->expected_prior = 0;
179 s->received_prior = 0;
180 s->jitter = 0;
181 s->transit = 0;
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182}
183
5d471b73 184/* Returns 1 if we should handle this packet. */
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185static int rtp_valid_packet_in_sequence(RTPStatistics *s, uint16_t seq)
186{
48f01398
MS
187 uint16_t udelta = seq - s->max_seq;
188 const int MAX_DROPOUT = 3000;
189 const int MAX_MISORDER = 100;
8eb793c4
LA
190 const int MIN_SEQUENTIAL = 2;
191
5d471b73
MS
192 /* source not valid until MIN_SEQUENTIAL packets with sequence
193 * seq. numbers have been received */
48f01398
MS
194 if (s->probation) {
195 if (seq == s->max_seq + 1) {
8eb793c4 196 s->probation--;
48f01398
MS
197 s->max_seq = seq;
198 if (s->probation == 0) {
8eb793c4
LA
199 rtp_init_sequence(s, seq);
200 s->received++;
201 return 1;
202 }
203 } else {
48f01398 204 s->probation = MIN_SEQUENTIAL - 1;
5d471b73 205 s->max_seq = seq;
8eb793c4
LA
206 }
207 } else if (udelta < MAX_DROPOUT) {
208 // in order, with permissible gap
48f01398
MS
209 if (seq < s->max_seq) {
210 // sequence number wrapped; count another 64k cycles
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211 s->cycles += RTP_SEQ_MOD;
212 }
48f01398 213 s->max_seq = seq;
8eb793c4
LA
214 } else if (udelta <= RTP_SEQ_MOD - MAX_MISORDER) {
215 // sequence made a large jump...
48f01398 216 if (seq == s->bad_seq) {
5d471b73
MS
217 /* two sequential packets -- assume that the other side
218 * restarted without telling us; just resync. */
8eb793c4
LA
219 rtp_init_sequence(s, seq);
220 } else {
48f01398 221 s->bad_seq = (seq + 1) & (RTP_SEQ_MOD - 1);
8eb793c4
LA
222 return 0;
223 }
224 } else {
225 // duplicate or reordered packet...
226 }
227 s->received++;
228 return 1;
229}
230
e96406ed
MS
231int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, URLContext *fd,
232 AVIOContext *avio, int count)
8eb793c4 233{
ae628ec1 234 AVIOContext *pb;
8eb793c4
LA
235 uint8_t *buf;
236 int len;
237 int rtcp_bytes;
48f01398 238 RTPStatistics *stats = &s->statistics;
8eb793c4
LA
239 uint32_t lost;
240 uint32_t extended_max;
241 uint32_t expected_interval;
242 uint32_t received_interval;
243 uint32_t lost_interval;
244 uint32_t expected;
245 uint32_t fraction;
48f01398 246 uint64_t ntp_time = s->last_rtcp_ntp_time; // TODO: Get local ntp time?
8eb793c4 247
e96406ed 248 if ((!fd && !avio) || (count < 1))
8eb793c4
LA
249 return -1;
250
251 /* TODO: I think this is way too often; RFC 1889 has algorithm for this */
5d471b73 252 /* XXX: MPEG pts hardcoded. RTCP send every 0.5 seconds */
8eb793c4
LA
253 s->octet_count += count;
254 rtcp_bytes = ((s->octet_count - s->last_octet_count) * RTCP_TX_RATIO_NUM) /
255 RTCP_TX_RATIO_DEN;
256 rtcp_bytes /= 50; // mmu_man: that's enough for me... VLC sends much less btw !?
257 if (rtcp_bytes < 28)
258 return -1;
259 s->last_octet_count = s->octet_count;
260
e96406ed
MS
261 if (!fd)
262 pb = avio;
263 else if (avio_open_dyn_buf(&pb) < 0)
8eb793c4
LA
264 return -1;
265
266 // Receiver Report
77eb5504
AK
267 avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
268 avio_w8(pb, RTCP_RR);
269 avio_wb16(pb, 7); /* length in words - 1 */
952139a3 270 // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
77eb5504
AK
271 avio_wb32(pb, s->ssrc + 1);
272 avio_wb32(pb, s->ssrc); // server SSRC
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LA
273 // some placeholders we should really fill...
274 // RFC 1889/p64
5d471b73 275 extended_max = stats->cycles + stats->max_seq;
abae27ed 276 expected = extended_max - stats->base_seq;
5d471b73
MS
277 lost = expected - stats->received;
278 lost = FFMIN(lost, 0xffffff); // clamp it since it's only 24 bits...
279 expected_interval = expected - stats->expected_prior;
48f01398 280 stats->expected_prior = expected;
5d471b73 281 received_interval = stats->received - stats->received_prior;
48f01398 282 stats->received_prior = stats->received;
5d471b73 283 lost_interval = expected_interval - received_interval;
48f01398
MS
284 if (expected_interval == 0 || lost_interval <= 0)
285 fraction = 0;
286 else
287 fraction = (lost_interval << 8) / expected_interval;
288
289 fraction = (fraction << 24) | lost;
8eb793c4 290
77eb5504
AK
291 avio_wb32(pb, fraction); /* 8 bits of fraction, 24 bits of total packets lost */
292 avio_wb32(pb, extended_max); /* max sequence received */
48f01398 293 avio_wb32(pb, stats->jitter >> 4); /* jitter */
8eb793c4 294
48f01398 295 if (s->last_rtcp_ntp_time == AV_NOPTS_VALUE) {
77eb5504
AK
296 avio_wb32(pb, 0); /* last SR timestamp */
297 avio_wb32(pb, 0); /* delay since last SR */
8eb793c4 298 } else {
5d471b73 299 uint32_t middle_32_bits = s->last_rtcp_ntp_time >> 16; // this is valid, right? do we need to handle 64 bit values special?
48f01398 300 uint32_t delay_since_last = ntp_time - s->last_rtcp_ntp_time;
8eb793c4 301
77eb5504
AK
302 avio_wb32(pb, middle_32_bits); /* last SR timestamp */
303 avio_wb32(pb, delay_since_last); /* delay since last SR */
8eb793c4
LA
304 }
305
306 // CNAME
77eb5504
AK
307 avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
308 avio_w8(pb, RTCP_SDES);
8eb793c4 309 len = strlen(s->hostname);
ed790932 310 avio_wb16(pb, (7 + len + 3) / 4); /* length in words - 1 */
ad7beb2c 311 avio_wb32(pb, s->ssrc + 1);
77eb5504
AK
312 avio_w8(pb, 0x01);
313 avio_w8(pb, len);
314 avio_write(pb, s->hostname, len);
ed790932 315 avio_w8(pb, 0); /* END */
8eb793c4 316 // padding
ed790932 317 for (len = (7 + len) % 4; len % 4; len++)
77eb5504 318 avio_w8(pb, 0);
8eb793c4 319
b7f2fdde 320 avio_flush(pb);
e96406ed
MS
321 if (!fd)
322 return 0;
6dc7d80d 323 len = avio_close_dyn_buf(pb, &buf);
8eb793c4 324 if ((len > 0) && buf) {
5e1166b3 325 int av_unused result;
dfd2a005 326 av_dlog(s->ic, "sending %d bytes of RR\n", len);
3f95f0dd 327 result = ffurl_write(fd, buf, len);
925e908b 328 av_dlog(s->ic, "result from ffurl_write: %d\n", result);
8eb793c4
LA
329 av_free(buf);
330 }
331 return 0;
332}
333
5d471b73 334void ff_rtp_send_punch_packets(URLContext *rtp_handle)
9c8fa20d 335{
ae628ec1 336 AVIOContext *pb;
9c8fa20d
MS
337 uint8_t *buf;
338 int len;
339
340 /* Send a small RTP packet */
b92c5452 341 if (avio_open_dyn_buf(&pb) < 0)
9c8fa20d
MS
342 return;
343
77eb5504
AK
344 avio_w8(pb, (RTP_VERSION << 6));
345 avio_w8(pb, 0); /* Payload type */
346 avio_wb16(pb, 0); /* Seq */
347 avio_wb32(pb, 0); /* Timestamp */
348 avio_wb32(pb, 0); /* SSRC */
9c8fa20d 349
b7f2fdde 350 avio_flush(pb);
6dc7d80d 351 len = avio_close_dyn_buf(pb, &buf);
9c8fa20d 352 if ((len > 0) && buf)
925e908b 353 ffurl_write(rtp_handle, buf, len);
9c8fa20d
MS
354 av_free(buf);
355
356 /* Send a minimal RTCP RR */
b92c5452 357 if (avio_open_dyn_buf(&pb) < 0)
9c8fa20d
MS
358 return;
359
77eb5504
AK
360 avio_w8(pb, (RTP_VERSION << 6));
361 avio_w8(pb, RTCP_RR); /* receiver report */
362 avio_wb16(pb, 1); /* length in words - 1 */
363 avio_wb32(pb, 0); /* our own SSRC */
9c8fa20d 364
b7f2fdde 365 avio_flush(pb);
6dc7d80d 366 len = avio_close_dyn_buf(pb, &buf);
9c8fa20d 367 if ((len > 0) && buf)
925e908b 368 ffurl_write(rtp_handle, buf, len);
9c8fa20d
MS
369 av_free(buf);
370}
371
86d9181c
MS
372static int find_missing_packets(RTPDemuxContext *s, uint16_t *first_missing,
373 uint16_t *missing_mask)
374{
375 int i;
376 uint16_t next_seq = s->seq + 1;
377 RTPPacket *pkt = s->queue;
378
379 if (!pkt || pkt->seq == next_seq)
380 return 0;
381
382 *missing_mask = 0;
383 for (i = 1; i <= 16; i++) {
384 uint16_t missing_seq = next_seq + i;
385 while (pkt) {
386 int16_t diff = pkt->seq - missing_seq;
387 if (diff >= 0)
388 break;
389 pkt = pkt->next;
390 }
391 if (!pkt)
392 break;
393 if (pkt->seq == missing_seq)
394 continue;
395 *missing_mask |= 1 << (i - 1);
396 }
397
398 *first_missing = next_seq;
399 return 1;
400}
401
402int ff_rtp_send_rtcp_feedback(RTPDemuxContext *s, URLContext *fd,
403 AVIOContext *avio)
404{
405 int len, need_keyframe, missing_packets;
406 AVIOContext *pb;
407 uint8_t *buf;
408 int64_t now;
409 uint16_t first_missing, missing_mask;
410
411 if (!fd && !avio)
412 return -1;
413
414 need_keyframe = s->handler && s->handler->need_keyframe &&
415 s->handler->need_keyframe(s->dynamic_protocol_context);
416 missing_packets = find_missing_packets(s, &first_missing, &missing_mask);
417
418 if (!need_keyframe && !missing_packets)
419 return 0;
420
421 /* Send new feedback if enough time has elapsed since the last
422 * feedback packet. */
423
424 now = av_gettime();
425 if (s->last_feedback_time &&
426 (now - s->last_feedback_time) < MIN_FEEDBACK_INTERVAL)
427 return 0;
428 s->last_feedback_time = now;
429
430 if (!fd)
431 pb = avio;
432 else if (avio_open_dyn_buf(&pb) < 0)
433 return -1;
434
435 if (need_keyframe) {
436 avio_w8(pb, (RTP_VERSION << 6) | 1); /* PLI */
437 avio_w8(pb, RTCP_PSFB);
438 avio_wb16(pb, 2); /* length in words - 1 */
439 // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
440 avio_wb32(pb, s->ssrc + 1);
441 avio_wb32(pb, s->ssrc); // server SSRC
442 }
443
444 if (missing_packets) {
445 avio_w8(pb, (RTP_VERSION << 6) | 1); /* NACK */
446 avio_w8(pb, RTCP_RTPFB);
447 avio_wb16(pb, 3); /* length in words - 1 */
448 avio_wb32(pb, s->ssrc + 1);
449 avio_wb32(pb, s->ssrc); // server SSRC
450
451 avio_wb16(pb, first_missing);
452 avio_wb16(pb, missing_mask);
453 }
454
455 avio_flush(pb);
456 if (!fd)
457 return 0;
458 len = avio_close_dyn_buf(pb, &buf);
459 if (len > 0 && buf) {
460 ffurl_write(fd, buf, len);
461 av_free(buf);
462 }
463 return 0;
464}
465
8eb793c4
LA
466/**
467 * open a new RTP parse context for stream 'st'. 'st' can be NULL for
5d471b73 468 * MPEG2-TS streams to indicate that they should be demuxed inside the
36ef5369 469 * rtp demux (otherwise AV_CODEC_ID_MPEG2TS packets are returned)
8eb793c4 470 */
5d471b73 471RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st,
3f95f0dd 472 int payload_type, int queue_size)
8eb793c4
LA
473{
474 RTPDemuxContext *s;
475
476 s = av_mallocz(sizeof(RTPDemuxContext));
477 if (!s)
478 return NULL;
5d471b73
MS
479 s->payload_type = payload_type;
480 s->last_rtcp_ntp_time = AV_NOPTS_VALUE;
2cab6b48 481 s->first_rtcp_ntp_time = AV_NOPTS_VALUE;
5d471b73
MS
482 s->ic = s1;
483 s->st = st;
484 s->queue_size = queue_size;
f6804c3e 485 rtp_init_statistics(&s->statistics, 0);
8eb793c4 486 if (!strcmp(ff_rtp_enc_name(payload_type), "MP2T")) {
9125806e 487 s->ts = ff_mpegts_parse_open(s->ic);
8eb793c4
LA
488 if (s->ts == NULL) {
489 av_free(s);
490 return NULL;
491 }
45600148 492 } else if (st) {
5d471b73 493 switch (st->codec->codec_id) {
36ef5369
AK
494 case AV_CODEC_ID_MPEG1VIDEO:
495 case AV_CODEC_ID_MPEG2VIDEO:
496 case AV_CODEC_ID_MP2:
497 case AV_CODEC_ID_MP3:
498 case AV_CODEC_ID_MPEG4:
499 case AV_CODEC_ID_H263:
500 case AV_CODEC_ID_H264:
8eb793c4
LA
501 st->need_parsing = AVSTREAM_PARSE_FULL;
502 break;
36ef5369 503 case AV_CODEC_ID_VORBIS:
5602a464
JR
504 st->need_parsing = AVSTREAM_PARSE_HEADERS;
505 break;
36ef5369 506 case AV_CODEC_ID_ADPCM_G722:
0048a2a8
MS
507 /* According to RFC 3551, the stream clock rate is 8000
508 * even if the sample rate is 16000. */
509 if (st->codec->sample_rate == 8000)
510 st->codec->sample_rate = 16000;
511 break;
8eb793c4
LA
512 default:
513 break;
514 }
515 }
516 // needed to send back RTCP RR in RTSP sessions
8eb793c4
LA
517 gethostname(s->hostname, sizeof(s->hostname));
518 return s;
519}
520
48f01398
MS
521void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
522 RTPDynamicProtocolHandler *handler)
99a1d191
RB
523{
524 s->dynamic_protocol_context = ctx;
42805eda 525 s->handler = handler;
99a1d191
RB
526}
527
8eb793c4 528/**
5d471b73
MS
529 * This was the second switch in rtp_parse packet.
530 * Normalizes time, if required, sets stream_index, etc.
8eb793c4
LA
531 */
532static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestamp)
533{
79d482b1
MS
534 if (pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE)
535 return; /* Timestamp already set by depacketizer */
b8a1b880
JB
536 if (timestamp == RTP_NOTS_VALUE)
537 return;
538
525c5b08 539 if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE && s->ic->nb_streams > 1) {
fba7815d
LA
540 int64_t addend;
541 int delta_timestamp;
542
543 /* compute pts from timestamp with received ntp_time */
544 delta_timestamp = timestamp - s->last_rtcp_timestamp;
545 /* convert to the PTS timebase */
5d471b73
MS
546 addend = av_rescale(s->last_rtcp_ntp_time - s->first_rtcp_ntp_time,
547 s->st->time_base.den,
548 (uint64_t) s->st->time_base.num << 32);
3a1cdcc7
MS
549 pkt->pts = s->range_start_offset + s->rtcp_ts_offset + addend +
550 delta_timestamp;
551 return;
fba7815d 552 }
b8a1b880 553
3a1cdcc7
MS
554 if (!s->base_timestamp)
555 s->base_timestamp = timestamp;
5d471b73
MS
556 /* assume that the difference is INT32_MIN < x < INT32_MAX,
557 * but allow the first timestamp to exceed INT32_MAX */
12348ca2
JB
558 if (!s->timestamp)
559 s->unwrapped_timestamp += timestamp;
560 else
561 s->unwrapped_timestamp += (int32_t)(timestamp - s->timestamp);
562 s->timestamp = timestamp;
5d471b73
MS
563 pkt->pts = s->unwrapped_timestamp + s->range_start_offset -
564 s->base_timestamp;
8eb793c4
LA
565}
566
02607418
MS
567static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,
568 const uint8_t *buf, int len)
8eb793c4
LA
569{
570 unsigned int ssrc, h;
f841a0fc 571 int payload_type, seq, ret, flags = 0;
9446b4bb 572 int ext;
8eb793c4
LA
573 AVStream *st;
574 uint32_t timestamp;
5d471b73 575 int rv = 0;
8eb793c4 576
5d471b73 577 ext = buf[0] & 0x10;
8eb793c4 578 payload_type = buf[1] & 0x7f;
144ae29d
RB
579 if (buf[1] & 0x80)
580 flags |= RTP_FLAG_MARKER;
5d471b73 581 seq = AV_RB16(buf + 2);
8eb793c4 582 timestamp = AV_RB32(buf + 4);
5d471b73 583 ssrc = AV_RB32(buf + 8);
8eb793c4
LA
584 /* store the ssrc in the RTPDemuxContext */
585 s->ssrc = ssrc;
586
587 /* NOTE: we can handle only one payload type */
588 if (s->payload_type != payload_type)
589 return -1;
590
591 st = s->st;
592 // only do something with this if all the rtp checks pass...
5d471b73
MS
593 if (!rtp_valid_packet_in_sequence(&s->statistics, seq)) {
594 av_log(st ? st->codec : NULL, AV_LOG_ERROR,
595 "RTP: PT=%02x: bad cseq %04x expected=%04x\n",
8eb793c4
LA
596 payload_type, seq, ((s->seq + 1) & 0xffff));
597 return -1;
598 }
599
4838cdab
MS
600 if (buf[0] & 0x20) {
601 int padding = buf[len - 1];
602 if (len >= 12 + padding)
603 len -= padding;
604 }
605
8eb793c4 606 s->seq = seq;
5d471b73
MS
607 len -= 12;
608 buf += 12;
8eb793c4 609
9446b4bb
RS
610 /* RFC 3550 Section 5.3.1 RTP Header Extension handling */
611 if (ext) {
612 if (len < 4)
613 return -1;
614 /* calculate the header extension length (stored as number
615 * of 32-bit words) */
616 ext = (AV_RB16(buf + 2) + 1) << 2;
617
618 if (len < ext)
619 return -1;
620 // skip past RTP header extension
621 len -= ext;
622 buf += ext;
623 }
624
8eb793c4 625 if (!st) {
5d471b73 626 /* specific MPEG2-TS demux support */
9125806e 627 ret = ff_mpegts_parse_packet(s->ts, pkt, buf, len);
946df059
MS
628 /* The only error that can be returned from ff_mpegts_parse_packet
629 * is "no more data to return from the provided buffer", so return
630 * AVERROR(EAGAIN) for all errors */
4ffff367 631 if (ret < 0)
946df059 632 return AVERROR(EAGAIN);
8eb793c4 633 if (ret < len) {
81ef5192 634 s->read_buf_size = FFMIN(len - ret, sizeof(s->buf));
8eb793c4
LA
635 memcpy(s->buf, buf + ret, s->read_buf_size);
636 s->read_buf_index = 0;
637 return 1;
638 }
f3e71942 639 return 0;
42805eda
MS
640 } else if (s->handler && s->handler->parse_packet) {
641 rv = s->handler->parse_packet(s->ic, s->dynamic_protocol_context,
642 s->st, pkt, &timestamp, buf, len, seq,
643 flags);
8eb793c4 644 } else {
5d471b73
MS
645 /* At this point, the RTP header has been stripped;
646 * This is ASSUMING that there is only 1 CSRC, which isn't wise. */
647 switch (st->codec->codec_id) {
36ef5369
AK
648 case AV_CODEC_ID_MP2:
649 case AV_CODEC_ID_MP3:
5d471b73 650 /* better than nothing: skip MPEG audio RTP header */
8eb793c4
LA
651 if (len <= 4)
652 return -1;
5d471b73 653 h = AV_RB32(buf);
8eb793c4
LA
654 len -= 4;
655 buf += 4;
656 av_new_packet(pkt, len);
657 memcpy(pkt->data, buf, len);
658 break;
36ef5369
AK
659 case AV_CODEC_ID_MPEG1VIDEO:
660 case AV_CODEC_ID_MPEG2VIDEO:
5d471b73 661 /* better than nothing: skip MPEG video RTP header */
8eb793c4
LA
662 if (len <= 4)
663 return -1;
5d471b73 664 h = AV_RB32(buf);
8eb793c4
LA
665 buf += 4;
666 len -= 4;
667 if (h & (1 << 26)) {
5d471b73 668 /* MPEG-2 */
8eb793c4
LA
669 if (len <= 4)
670 return -1;
671 buf += 4;
672 len -= 4;
673 }
674 av_new_packet(pkt, len);
675 memcpy(pkt->data, buf, len);
676 break;
8eb793c4 677 default:
f739b36d
RB
678 av_new_packet(pkt, len);
679 memcpy(pkt->data, buf, len);
8eb793c4
LA
680 break;
681 }
eafb17d1
RB
682
683 pkt->stream_index = st->index;
f3e71942 684 }
8eb793c4 685
95f03cf3
RB
686 // now perform timestamp things....
687 finalize_packet(s, pkt, timestamp);
f3e71942 688
8eb793c4
LA
689 return rv;
690}
691
58ee0991
MS
692void ff_rtp_reset_packet_queue(RTPDemuxContext *s)
693{
694 while (s->queue) {
695 RTPPacket *next = s->queue->next;
696 av_free(s->queue->buf);
697 av_free(s->queue);
698 s->queue = next;
699 }
700 s->seq = 0;
701 s->queue_len = 0;
702 s->prev_ret = 0;
703}
704
705static void enqueue_packet(RTPDemuxContext *s, uint8_t *buf, int len)
706{
5d471b73 707 uint16_t seq = AV_RB16(buf + 2);
58ee0991
MS
708 RTPPacket *cur = s->queue, *prev = NULL, *packet;
709
710 /* Find the correct place in the queue to insert the packet */
711 while (cur) {
712 int16_t diff = seq - cur->seq;
713 if (diff < 0)
714 break;
715 prev = cur;
5d471b73 716 cur = cur->next;
58ee0991
MS
717 }
718
719 packet = av_mallocz(sizeof(*packet));
720 if (!packet)
721 return;
722 packet->recvtime = av_gettime();
5d471b73
MS
723 packet->seq = seq;
724 packet->len = len;
725 packet->buf = buf;
726 packet->next = cur;
58ee0991
MS
727 if (prev)
728 prev->next = packet;
729 else
730 s->queue = packet;
731 s->queue_len++;
732}
733
734static int has_next_packet(RTPDemuxContext *s)
735{
ddcf8411 736 return s->queue && s->queue->seq == (uint16_t) (s->seq + 1);
58ee0991
MS
737}
738
739int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s)
740{
741 return s->queue ? s->queue->recvtime : 0;
742}
743
744static int rtp_parse_queued_packet(RTPDemuxContext *s, AVPacket *pkt)
745{
746 int rv;
747 RTPPacket *next;
748
749 if (s->queue_len <= 0)
750 return -1;
751
752 if (!has_next_packet(s))
753 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
754 "RTP: missed %d packets\n", s->queue->seq - s->seq - 1);
755
756 /* Parse the first packet in the queue, and dequeue it */
5d471b73 757 rv = rtp_parse_packet_internal(s, pkt, s->queue->buf, s->queue->len);
58ee0991
MS
758 next = s->queue->next;
759 av_free(s->queue->buf);
760 av_free(s->queue);
761 s->queue = next;
762 s->queue_len--;
4ffff367 763 return rv;
58ee0991
MS
764}
765
4ffff367 766static int rtp_parse_one_packet(RTPDemuxContext *s, AVPacket *pkt,
48f01398 767 uint8_t **bufptr, int len)
02607418 768{
5d471b73 769 uint8_t *buf = bufptr ? *bufptr : NULL;
02607418
MS
770 int ret, flags = 0;
771 uint32_t timestamp;
5d471b73 772 int rv = 0;
02607418
MS
773
774 if (!buf) {
f6e138b4
MS
775 /* If parsing of the previous packet actually returned 0 or an error,
776 * there's nothing more to be parsed from that packet, but we may have
58ee0991 777 * indicated that we can return the next enqueued packet. */
f6e138b4 778 if (s->prev_ret <= 0)
58ee0991 779 return rtp_parse_queued_packet(s, pkt);
02607418 780 /* return the next packets, if any */
42805eda 781 if (s->st && s->handler && s->handler->parse_packet) {
02607418
MS
782 /* timestamp should be overwritten by parse_packet, if not,
783 * the packet is left with pts == AV_NOPTS_VALUE */
784 timestamp = RTP_NOTS_VALUE;
42805eda
MS
785 rv = s->handler->parse_packet(s->ic, s->dynamic_protocol_context,
786 s->st, pkt, &timestamp, NULL, 0, 0,
787 flags);
02607418 788 finalize_packet(s, pkt, timestamp);
4ffff367 789 return rv;
02607418
MS
790 } else {
791 // TODO: Move to a dynamic packet handler (like above)
4ffff367 792 if (s->read_buf_index >= s->read_buf_size)
91ec7aea 793 return AVERROR(EAGAIN);
02607418 794 ret = ff_mpegts_parse_packet(s->ts, pkt, s->buf + s->read_buf_index,
5d471b73 795 s->read_buf_size - s->read_buf_index);
4ffff367 796 if (ret < 0)
946df059 797 return AVERROR(EAGAIN);
02607418
MS
798 s->read_buf_index += ret;
799 if (s->read_buf_index < s->read_buf_size)
800 return 1;
4ffff367
MS
801 else
802 return 0;
02607418
MS
803 }
804 }
805
806 if (len < 12)
807 return -1;
808
809 if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
810 return -1;
298a587f 811 if (RTP_PT_IS_RTCP(buf[1])) {
02607418
MS
812 return rtcp_parse_packet(s, buf, len);
813 }
814
65cdee9c 815 if ((s->seq == 0 && !s->queue) || s->queue_size <= 1) {
58ee0991
MS
816 /* First packet, or no reordering */
817 return rtp_parse_packet_internal(s, pkt, buf, len);
818 } else {
819 uint16_t seq = AV_RB16(buf + 2);
820 int16_t diff = seq - s->seq;
821 if (diff < 0) {
822 /* Packet older than the previously emitted one, drop */
823 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
824 "RTP: dropping old packet received too late\n");
825 return -1;
826 } else if (diff <= 1) {
827 /* Correct packet */
828 rv = rtp_parse_packet_internal(s, pkt, buf, len);
4ffff367 829 return rv;
58ee0991
MS
830 } else {
831 /* Still missing some packet, enqueue this one. */
832 enqueue_packet(s, buf, len);
833 *bufptr = NULL;
834 /* Return the first enqueued packet if the queue is full,
835 * even if we're missing something */
836 if (s->queue_len >= s->queue_size)
837 return rtp_parse_queued_packet(s, pkt);
838 return -1;
839 }
840 }
02607418
MS
841}
842
4ffff367
MS
843/**
844 * Parse an RTP or RTCP packet directly sent as a buffer.
845 * @param s RTP parse context.
846 * @param pkt returned packet
847 * @param bufptr pointer to the input buffer or NULL to read the next packets
848 * @param len buffer len
849 * @return 0 if a packet is returned, 1 if a packet is returned and more can follow
850 * (use buf as NULL to read the next). -1 if no packet (error or no more packet).
851 */
bfc6db44
MS
852int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
853 uint8_t **bufptr, int len)
4ffff367
MS
854{
855 int rv = rtp_parse_one_packet(s, pkt, bufptr, len);
856 s->prev_ret = rv;
d678a6fd
MS
857 while (rv == AVERROR(EAGAIN) && has_next_packet(s))
858 rv = rtp_parse_queued_packet(s, pkt);
4ffff367
MS
859 return rv ? rv : has_next_packet(s);
860}
861
bfc6db44 862void ff_rtp_parse_close(RTPDemuxContext *s)
8eb793c4 863{
58ee0991 864 ff_rtp_reset_packet_queue(s);
8eb793c4 865 if (!strcmp(ff_rtp_enc_name(s->payload_type), "MP2T")) {
9125806e 866 ff_mpegts_parse_close(s->ts);
8eb793c4
LA
867 }
868 av_free(s);
869}
016bc031
JA
870
871int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
872 int (*parse_fmtp)(AVStream *stream,
873 PayloadContext *data,
874 char *attr, char *value))
875{
876 char attr[256];
824535e3 877 char *value;
016bc031 878 int res;
824535e3
JA
879 int value_size = strlen(p) + 1;
880
881 if (!(value = av_malloc(value_size))) {
c3e15f7b 882 av_log(NULL, AV_LOG_ERROR, "Failed to allocate data for FMTP.");
824535e3
JA
883 return AVERROR(ENOMEM);
884 }
016bc031
JA
885
886 // remove protocol identifier
5d471b73
MS
887 while (*p && *p == ' ')
888 p++; // strip spaces
889 while (*p && *p != ' ')
890 p++; // eat protocol identifier
891 while (*p && *p == ' ')
892 p++; // strip trailing spaces
016bc031
JA
893
894 while (ff_rtsp_next_attr_and_value(&p,
895 attr, sizeof(attr),
824535e3 896 value, value_size)) {
016bc031 897 res = parse_fmtp(stream, data, attr, value);
824535e3
JA
898 if (res < 0 && res != AVERROR_PATCHWELCOME) {
899 av_free(value);
016bc031 900 return res;
824535e3 901 }
016bc031 902 }
824535e3 903 av_free(value);
016bc031
JA
904 return 0;
905}
179a5c37
AK
906
907int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx)
908{
909 av_init_packet(pkt);
910
5d471b73 911 pkt->size = avio_close_dyn_buf(*dyn_buf, &pkt->data);
179a5c37
AK
912 pkt->stream_index = stream_idx;
913 pkt->destruct = av_destruct_packet;
5d471b73 914 *dyn_buf = NULL;
179a5c37
AK
915 return pkt->size;
916}