yuv4mpeg: reject unsupported codecs
[libav.git] / libavformat / rtpdec.c
CommitLineData
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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"
925e908b 28#include "url.h"
8eb793c4 29
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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
403ee835 43 'ffio_open_dyn_packet_buf')
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44*/
45
69673138 46static RTPDynamicProtocolHandler realmedia_mp3_dynamic_handler = {
2eeefe20
MS
47 .enc_name = "X-MP3-draft-00",
48 .codec_type = AVMEDIA_TYPE_AUDIO,
36ef5369 49 .codec_id = AV_CODEC_ID_MP3ADU,
2eeefe20
MS
50};
51
b6bf1490
DS
52static RTPDynamicProtocolHandler speex_dynamic_handler = {
53 .enc_name = "speex",
54 .codec_type = AVMEDIA_TYPE_AUDIO,
55 .codec_id = AV_CODEC_ID_SPEEX,
56};
57
c136a813
MS
58static RTPDynamicProtocolHandler opus_dynamic_handler = {
59 .enc_name = "opus",
60 .codec_type = AVMEDIA_TYPE_AUDIO,
61 .codec_id = AV_CODEC_ID_OPUS,
62};
63
8eb793c4 64/* statistics functions */
119cc033 65static RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler= NULL;
8eb793c4 66
0369d2b0 67void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
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68{
69 handler->next= RTPFirstDynamicPayloadHandler;
70 RTPFirstDynamicPayloadHandler= handler;
71}
72
73void av_register_rtp_dynamic_payload_handlers(void)
74{
9b3788ef
JA
75 ff_register_dynamic_payload_handler(&ff_mp4v_es_dynamic_handler);
76 ff_register_dynamic_payload_handler(&ff_mpeg4_generic_dynamic_handler);
556aa7a1
RB
77 ff_register_dynamic_payload_handler(&ff_amr_nb_dynamic_handler);
78 ff_register_dynamic_payload_handler(&ff_amr_wb_dynamic_handler);
45aa9080
RB
79 ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
80 ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
08bddfcd 81 ff_register_dynamic_payload_handler(&ff_h263_rfc2190_dynamic_handler);
0369d2b0 82 ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
89c39605 83 ff_register_dynamic_payload_handler(&ff_ilbc_dynamic_handler);
3c198154 84 ff_register_dynamic_payload_handler(&ff_jpeg_dynamic_handler);
e6327fba 85 ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
887af2aa 86 ff_register_dynamic_payload_handler(&ff_theora_dynamic_handler);
a59096e4 87 ff_register_dynamic_payload_handler(&ff_qdm2_dynamic_handler);
4449df6b 88 ff_register_dynamic_payload_handler(&ff_svq3_dynamic_handler);
1ddc176e 89 ff_register_dynamic_payload_handler(&ff_mp4a_latm_dynamic_handler);
51291e60 90 ff_register_dynamic_payload_handler(&ff_vp8_dynamic_handler);
35014efc 91 ff_register_dynamic_payload_handler(&ff_qcelp_dynamic_handler);
69673138 92 ff_register_dynamic_payload_handler(&realmedia_mp3_dynamic_handler);
b6bf1490 93 ff_register_dynamic_payload_handler(&speex_dynamic_handler);
c136a813 94 ff_register_dynamic_payload_handler(&opus_dynamic_handler);
e9fce261
RB
95
96 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
97 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfa_handler);
3ece3e4c
MS
98
99 ff_register_dynamic_payload_handler(&ff_qt_rtp_aud_handler);
100 ff_register_dynamic_payload_handler(&ff_qt_rtp_vid_handler);
101 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_aud_handler);
102 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_vid_handler);
06d7325a
MS
103
104 ff_register_dynamic_payload_handler(&ff_g726_16_dynamic_handler);
105 ff_register_dynamic_payload_handler(&ff_g726_24_dynamic_handler);
106 ff_register_dynamic_payload_handler(&ff_g726_32_dynamic_handler);
107 ff_register_dynamic_payload_handler(&ff_g726_40_dynamic_handler);
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108}
109
1e515c42
MS
110RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
111 enum AVMediaType codec_type)
112{
113 RTPDynamicProtocolHandler *handler;
114 for (handler = RTPFirstDynamicPayloadHandler;
115 handler; handler = handler->next)
bb3244de 116 if (!av_strcasecmp(name, handler->enc_name) &&
1e515c42
MS
117 codec_type == handler->codec_type)
118 return handler;
119 return NULL;
120}
121
122RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
123 enum AVMediaType codec_type)
124{
125 RTPDynamicProtocolHandler *handler;
126 for (handler = RTPFirstDynamicPayloadHandler;
127 handler; handler = handler->next)
128 if (handler->static_payload_id && handler->static_payload_id == id &&
129 codec_type == handler->codec_type)
130 return handler;
131 return NULL;
132}
133
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134static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf, int len)
135{
ff328c02 136 int payload_len;
07b77fe3
JB
137 while (len >= 4) {
138 payload_len = FFMIN(len, (AV_RB16(buf + 2) + 1) * 4);
139
ff328c02
JA
140 switch (buf[1]) {
141 case RTCP_SR:
07b77fe3 142 if (payload_len < 20) {
ff328c02
JA
143 av_log(NULL, AV_LOG_ERROR, "Invalid length for RTCP SR packet\n");
144 return AVERROR_INVALIDDATA;
145 }
ff328c02 146
682d28a9 147 s->last_rtcp_ntp_time = AV_RB64(buf + 8);
682d28a9 148 s->last_rtcp_timestamp = AV_RB32(buf + 16);
3a1cdcc7
MS
149 if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
150 s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
151 if (!s->base_timestamp)
152 s->base_timestamp = s->last_rtcp_timestamp;
153 s->rtcp_ts_offset = s->last_rtcp_timestamp - s->base_timestamp;
154 }
ff328c02 155
ff328c02 156 break;
b20359f5
JA
157 case RTCP_BYE:
158 return -RTCP_BYE;
ff328c02 159 }
07b77fe3
JB
160
161 buf += payload_len;
162 len -= payload_len;
ff328c02 163 }
b20359f5 164 return -1;
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LA
165}
166
167#define RTP_SEQ_MOD (1<<16)
168
169/**
170* called on parse open packet
171*/
172static void rtp_init_statistics(RTPStatistics *s, uint16_t base_sequence) // called on parse open packet.
173{
174 memset(s, 0, sizeof(RTPStatistics));
175 s->max_seq= base_sequence;
176 s->probation= 1;
177}
178
179/**
180* called whenever there is a large jump in sequence numbers, or when they get out of probation...
181*/
182static void rtp_init_sequence(RTPStatistics *s, uint16_t seq)
183{
184 s->max_seq= seq;
185 s->cycles= 0;
186 s->base_seq= seq -1;
187 s->bad_seq= RTP_SEQ_MOD + 1;
188 s->received= 0;
189 s->expected_prior= 0;
190 s->received_prior= 0;
191 s->jitter= 0;
192 s->transit= 0;
193}
194
195/**
196* returns 1 if we should handle this packet.
197*/
198static int rtp_valid_packet_in_sequence(RTPStatistics *s, uint16_t seq)
199{
200 uint16_t udelta= seq - s->max_seq;
201 const int MAX_DROPOUT= 3000;
202 const int MAX_MISORDER = 100;
203 const int MIN_SEQUENTIAL = 2;
204
205 /* source not valid until MIN_SEQUENTIAL packets with sequence seq. numbers have been received */
206 if(s->probation)
207 {
208 if(seq==s->max_seq + 1) {
209 s->probation--;
210 s->max_seq= seq;
211 if(s->probation==0) {
212 rtp_init_sequence(s, seq);
213 s->received++;
214 return 1;
215 }
216 } else {
217 s->probation= MIN_SEQUENTIAL - 1;
218 s->max_seq = seq;
219 }
220 } else if (udelta < MAX_DROPOUT) {
221 // in order, with permissible gap
222 if(seq < s->max_seq) {
223 //sequence number wrapped; count antother 64k cycles
224 s->cycles += RTP_SEQ_MOD;
225 }
226 s->max_seq= seq;
227 } else if (udelta <= RTP_SEQ_MOD - MAX_MISORDER) {
228 // sequence made a large jump...
229 if(seq==s->bad_seq) {
230 // two sequential packets-- assume that the other side restarted without telling us; just resync.
231 rtp_init_sequence(s, seq);
232 } else {
233 s->bad_seq= (seq + 1) & (RTP_SEQ_MOD-1);
234 return 0;
235 }
236 } else {
237 // duplicate or reordered packet...
238 }
239 s->received++;
240 return 1;
241}
242
bfc6db44 243int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
8eb793c4 244{
ae628ec1 245 AVIOContext *pb;
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LA
246 uint8_t *buf;
247 int len;
248 int rtcp_bytes;
249 RTPStatistics *stats= &s->statistics;
250 uint32_t lost;
251 uint32_t extended_max;
252 uint32_t expected_interval;
253 uint32_t received_interval;
254 uint32_t lost_interval;
255 uint32_t expected;
256 uint32_t fraction;
257 uint64_t ntp_time= s->last_rtcp_ntp_time; // TODO: Get local ntp time?
258
259 if (!s->rtp_ctx || (count < 1))
260 return -1;
261
262 /* TODO: I think this is way too often; RFC 1889 has algorithm for this */
263 /* XXX: mpeg pts hardcoded. RTCP send every 0.5 seconds */
264 s->octet_count += count;
265 rtcp_bytes = ((s->octet_count - s->last_octet_count) * RTCP_TX_RATIO_NUM) /
266 RTCP_TX_RATIO_DEN;
267 rtcp_bytes /= 50; // mmu_man: that's enough for me... VLC sends much less btw !?
268 if (rtcp_bytes < 28)
269 return -1;
270 s->last_octet_count = s->octet_count;
271
b92c5452 272 if (avio_open_dyn_buf(&pb) < 0)
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273 return -1;
274
275 // Receiver Report
77eb5504
AK
276 avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
277 avio_w8(pb, RTCP_RR);
278 avio_wb16(pb, 7); /* length in words - 1 */
952139a3 279 // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
77eb5504
AK
280 avio_wb32(pb, s->ssrc + 1);
281 avio_wb32(pb, s->ssrc); // server SSRC
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282 // some placeholders we should really fill...
283 // RFC 1889/p64
284 extended_max= stats->cycles + stats->max_seq;
285 expected= extended_max - stats->base_seq + 1;
286 lost= expected - stats->received;
287 lost= FFMIN(lost, 0xffffff); // clamp it since it's only 24 bits...
288 expected_interval= expected - stats->expected_prior;
289 stats->expected_prior= expected;
290 received_interval= stats->received - stats->received_prior;
291 stats->received_prior= stats->received;
292 lost_interval= expected_interval - received_interval;
293 if (expected_interval==0 || lost_interval<=0) fraction= 0;
294 else fraction = (lost_interval<<8)/expected_interval;
295
296 fraction= (fraction<<24) | lost;
297
77eb5504
AK
298 avio_wb32(pb, fraction); /* 8 bits of fraction, 24 bits of total packets lost */
299 avio_wb32(pb, extended_max); /* max sequence received */
300 avio_wb32(pb, stats->jitter>>4); /* jitter */
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301
302 if(s->last_rtcp_ntp_time==AV_NOPTS_VALUE)
303 {
77eb5504
AK
304 avio_wb32(pb, 0); /* last SR timestamp */
305 avio_wb32(pb, 0); /* delay since last SR */
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306 } else {
307 uint32_t middle_32_bits= s->last_rtcp_ntp_time>>16; // this is valid, right? do we need to handle 64 bit values special?
308 uint32_t delay_since_last= ntp_time - s->last_rtcp_ntp_time;
309
77eb5504
AK
310 avio_wb32(pb, middle_32_bits); /* last SR timestamp */
311 avio_wb32(pb, delay_since_last); /* delay since last SR */
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312 }
313
314 // CNAME
77eb5504
AK
315 avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
316 avio_w8(pb, RTCP_SDES);
8eb793c4 317 len = strlen(s->hostname);
77eb5504 318 avio_wb16(pb, (6 + len + 3) / 4); /* length in words - 1 */
ad7beb2c 319 avio_wb32(pb, s->ssrc + 1);
77eb5504
AK
320 avio_w8(pb, 0x01);
321 avio_w8(pb, len);
322 avio_write(pb, s->hostname, len);
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LA
323 // padding
324 for (len = (6 + len) % 4; len % 4; len++) {
77eb5504 325 avio_w8(pb, 0);
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LA
326 }
327
b7f2fdde 328 avio_flush(pb);
6dc7d80d 329 len = avio_close_dyn_buf(pb, &buf);
8eb793c4 330 if ((len > 0) && buf) {
5e1166b3 331 int av_unused result;
dfd2a005 332 av_dlog(s->ic, "sending %d bytes of RR\n", len);
925e908b
AK
333 result= ffurl_write(s->rtp_ctx, buf, len);
334 av_dlog(s->ic, "result from ffurl_write: %d\n", result);
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335 av_free(buf);
336 }
337 return 0;
338}
339
bfc6db44 340void ff_rtp_send_punch_packets(URLContext* rtp_handle)
9c8fa20d 341{
ae628ec1 342 AVIOContext *pb;
9c8fa20d
MS
343 uint8_t *buf;
344 int len;
345
346 /* Send a small RTP packet */
b92c5452 347 if (avio_open_dyn_buf(&pb) < 0)
9c8fa20d
MS
348 return;
349
77eb5504
AK
350 avio_w8(pb, (RTP_VERSION << 6));
351 avio_w8(pb, 0); /* Payload type */
352 avio_wb16(pb, 0); /* Seq */
353 avio_wb32(pb, 0); /* Timestamp */
354 avio_wb32(pb, 0); /* SSRC */
9c8fa20d 355
b7f2fdde 356 avio_flush(pb);
6dc7d80d 357 len = avio_close_dyn_buf(pb, &buf);
9c8fa20d 358 if ((len > 0) && buf)
925e908b 359 ffurl_write(rtp_handle, buf, len);
9c8fa20d
MS
360 av_free(buf);
361
362 /* Send a minimal RTCP RR */
b92c5452 363 if (avio_open_dyn_buf(&pb) < 0)
9c8fa20d
MS
364 return;
365
77eb5504
AK
366 avio_w8(pb, (RTP_VERSION << 6));
367 avio_w8(pb, RTCP_RR); /* receiver report */
368 avio_wb16(pb, 1); /* length in words - 1 */
369 avio_wb32(pb, 0); /* our own SSRC */
9c8fa20d 370
b7f2fdde 371 avio_flush(pb);
6dc7d80d 372 len = avio_close_dyn_buf(pb, &buf);
9c8fa20d 373 if ((len > 0) && buf)
925e908b 374 ffurl_write(rtp_handle, buf, len);
9c8fa20d
MS
375 av_free(buf);
376}
377
378
8eb793c4
LA
379/**
380 * open a new RTP parse context for stream 'st'. 'st' can be NULL for
381 * MPEG2TS streams to indicate that they should be demuxed inside the
36ef5369 382 * rtp demux (otherwise AV_CODEC_ID_MPEG2TS packets are returned)
8eb793c4 383 */
bfc6db44 384RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, int queue_size)
8eb793c4
LA
385{
386 RTPDemuxContext *s;
387
388 s = av_mallocz(sizeof(RTPDemuxContext));
389 if (!s)
390 return NULL;
391 s->payload_type = payload_type;
392 s->last_rtcp_ntp_time = AV_NOPTS_VALUE;
2cab6b48 393 s->first_rtcp_ntp_time = AV_NOPTS_VALUE;
8eb793c4
LA
394 s->ic = s1;
395 s->st = st;
58ee0991 396 s->queue_size = queue_size;
8eb793c4
LA
397 rtp_init_statistics(&s->statistics, 0); // do we know the initial sequence from sdp?
398 if (!strcmp(ff_rtp_enc_name(payload_type), "MP2T")) {
9125806e 399 s->ts = ff_mpegts_parse_open(s->ic);
8eb793c4
LA
400 if (s->ts == NULL) {
401 av_free(s);
402 return NULL;
403 }
45600148 404 } else if (st) {
8eb793c4 405 switch(st->codec->codec_id) {
36ef5369
AK
406 case AV_CODEC_ID_MPEG1VIDEO:
407 case AV_CODEC_ID_MPEG2VIDEO:
408 case AV_CODEC_ID_MP2:
409 case AV_CODEC_ID_MP3:
410 case AV_CODEC_ID_MPEG4:
411 case AV_CODEC_ID_H263:
412 case AV_CODEC_ID_H264:
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LA
413 st->need_parsing = AVSTREAM_PARSE_FULL;
414 break;
36ef5369 415 case AV_CODEC_ID_VORBIS:
5602a464
JR
416 st->need_parsing = AVSTREAM_PARSE_HEADERS;
417 break;
36ef5369 418 case AV_CODEC_ID_ADPCM_G722:
0048a2a8
MS
419 /* According to RFC 3551, the stream clock rate is 8000
420 * even if the sample rate is 16000. */
421 if (st->codec->sample_rate == 8000)
422 st->codec->sample_rate = 16000;
423 break;
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LA
424 default:
425 break;
426 }
427 }
428 // needed to send back RTCP RR in RTSP sessions
429 s->rtp_ctx = rtpc;
430 gethostname(s->hostname, sizeof(s->hostname));
431 return s;
432}
433
99a1d191 434void
bfc6db44
MS
435ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
436 RTPDynamicProtocolHandler *handler)
99a1d191
RB
437{
438 s->dynamic_protocol_context = ctx;
439 s->parse_packet = handler->parse_packet;
440}
441
8eb793c4
LA
442/**
443 * This was the second switch in rtp_parse packet. Normalizes time, if required, sets stream_index, etc.
444 */
445static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestamp)
446{
79d482b1
MS
447 if (pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE)
448 return; /* Timestamp already set by depacketizer */
b8a1b880
JB
449 if (timestamp == RTP_NOTS_VALUE)
450 return;
451
525c5b08 452 if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE && s->ic->nb_streams > 1) {
fba7815d
LA
453 int64_t addend;
454 int delta_timestamp;
455
456 /* compute pts from timestamp with received ntp_time */
457 delta_timestamp = timestamp - s->last_rtcp_timestamp;
458 /* convert to the PTS timebase */
2cab6b48 459 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);
3a1cdcc7
MS
460 pkt->pts = s->range_start_offset + s->rtcp_ts_offset + addend +
461 delta_timestamp;
462 return;
fba7815d 463 }
b8a1b880 464
3a1cdcc7
MS
465 if (!s->base_timestamp)
466 s->base_timestamp = timestamp;
12348ca2
JB
467 /* assume that the difference is INT32_MIN < x < INT32_MAX, but allow the first timestamp to exceed INT32_MAX */
468 if (!s->timestamp)
469 s->unwrapped_timestamp += timestamp;
470 else
471 s->unwrapped_timestamp += (int32_t)(timestamp - s->timestamp);
472 s->timestamp = timestamp;
473 pkt->pts = s->unwrapped_timestamp + s->range_start_offset - s->base_timestamp;
8eb793c4
LA
474}
475
02607418
MS
476static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,
477 const uint8_t *buf, int len)
8eb793c4
LA
478{
479 unsigned int ssrc, h;
f841a0fc 480 int payload_type, seq, ret, flags = 0;
9446b4bb 481 int ext;
8eb793c4
LA
482 AVStream *st;
483 uint32_t timestamp;
484 int rv= 0;
485
9446b4bb 486 ext = buf[0] & 0x10;
8eb793c4 487 payload_type = buf[1] & 0x7f;
144ae29d
RB
488 if (buf[1] & 0x80)
489 flags |= RTP_FLAG_MARKER;
8eb793c4
LA
490 seq = AV_RB16(buf + 2);
491 timestamp = AV_RB32(buf + 4);
492 ssrc = AV_RB32(buf + 8);
493 /* store the ssrc in the RTPDemuxContext */
494 s->ssrc = ssrc;
495
496 /* NOTE: we can handle only one payload type */
497 if (s->payload_type != payload_type)
498 return -1;
499
500 st = s->st;
501 // only do something with this if all the rtp checks pass...
502 if(!rtp_valid_packet_in_sequence(&s->statistics, seq))
503 {
504 av_log(st?st->codec:NULL, AV_LOG_ERROR, "RTP: PT=%02x: bad cseq %04x expected=%04x\n",
505 payload_type, seq, ((s->seq + 1) & 0xffff));
506 return -1;
507 }
508
4838cdab
MS
509 if (buf[0] & 0x20) {
510 int padding = buf[len - 1];
511 if (len >= 12 + padding)
512 len -= padding;
513 }
514
8eb793c4
LA
515 s->seq = seq;
516 len -= 12;
517 buf += 12;
518
9446b4bb
RS
519 /* RFC 3550 Section 5.3.1 RTP Header Extension handling */
520 if (ext) {
521 if (len < 4)
522 return -1;
523 /* calculate the header extension length (stored as number
524 * of 32-bit words) */
525 ext = (AV_RB16(buf + 2) + 1) << 2;
526
527 if (len < ext)
528 return -1;
529 // skip past RTP header extension
530 len -= ext;
531 buf += ext;
532 }
533
8eb793c4
LA
534 if (!st) {
535 /* specific MPEG2TS demux support */
9125806e 536 ret = ff_mpegts_parse_packet(s->ts, pkt, buf, len);
946df059
MS
537 /* The only error that can be returned from ff_mpegts_parse_packet
538 * is "no more data to return from the provided buffer", so return
539 * AVERROR(EAGAIN) for all errors */
4ffff367 540 if (ret < 0)
946df059 541 return AVERROR(EAGAIN);
8eb793c4
LA
542 if (ret < len) {
543 s->read_buf_size = len - ret;
544 memcpy(s->buf, buf + ret, s->read_buf_size);
545 s->read_buf_index = 0;
546 return 1;
547 }
f3e71942 548 return 0;
b4e3330c 549 } else if (s->parse_packet) {
1a45a9f4 550 rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
9b932b8a 551 s->st, pkt, &timestamp, buf, len, flags);
8eb793c4
LA
552 } else {
553 // at this point, the RTP header has been stripped; This is ASSUMING that there is only 1 CSRC, which in't wise.
554 switch(st->codec->codec_id) {
36ef5369
AK
555 case AV_CODEC_ID_MP2:
556 case AV_CODEC_ID_MP3:
8eb793c4
LA
557 /* better than nothing: skip mpeg audio RTP header */
558 if (len <= 4)
559 return -1;
560 h = AV_RB32(buf);
561 len -= 4;
562 buf += 4;
563 av_new_packet(pkt, len);
564 memcpy(pkt->data, buf, len);
565 break;
36ef5369
AK
566 case AV_CODEC_ID_MPEG1VIDEO:
567 case AV_CODEC_ID_MPEG2VIDEO:
8eb793c4
LA
568 /* better than nothing: skip mpeg video RTP header */
569 if (len <= 4)
570 return -1;
571 h = AV_RB32(buf);
572 buf += 4;
573 len -= 4;
574 if (h & (1 << 26)) {
575 /* mpeg2 */
576 if (len <= 4)
577 return -1;
578 buf += 4;
579 len -= 4;
580 }
581 av_new_packet(pkt, len);
582 memcpy(pkt->data, buf, len);
583 break;
8eb793c4 584 default:
f739b36d
RB
585 av_new_packet(pkt, len);
586 memcpy(pkt->data, buf, len);
8eb793c4
LA
587 break;
588 }
eafb17d1
RB
589
590 pkt->stream_index = st->index;
f3e71942 591 }
8eb793c4 592
95f03cf3
RB
593 // now perform timestamp things....
594 finalize_packet(s, pkt, timestamp);
f3e71942 595
8eb793c4
LA
596 return rv;
597}
598
58ee0991
MS
599void ff_rtp_reset_packet_queue(RTPDemuxContext *s)
600{
601 while (s->queue) {
602 RTPPacket *next = s->queue->next;
603 av_free(s->queue->buf);
604 av_free(s->queue);
605 s->queue = next;
606 }
607 s->seq = 0;
608 s->queue_len = 0;
609 s->prev_ret = 0;
610}
611
612static void enqueue_packet(RTPDemuxContext *s, uint8_t *buf, int len)
613{
614 uint16_t seq = AV_RB16(buf + 2);
615 RTPPacket *cur = s->queue, *prev = NULL, *packet;
616
617 /* Find the correct place in the queue to insert the packet */
618 while (cur) {
619 int16_t diff = seq - cur->seq;
620 if (diff < 0)
621 break;
622 prev = cur;
623 cur = cur->next;
624 }
625
626 packet = av_mallocz(sizeof(*packet));
627 if (!packet)
628 return;
629 packet->recvtime = av_gettime();
630 packet->seq = seq;
631 packet->len = len;
632 packet->buf = buf;
633 packet->next = cur;
634 if (prev)
635 prev->next = packet;
636 else
637 s->queue = packet;
638 s->queue_len++;
639}
640
641static int has_next_packet(RTPDemuxContext *s)
642{
ddcf8411 643 return s->queue && s->queue->seq == (uint16_t) (s->seq + 1);
58ee0991
MS
644}
645
646int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s)
647{
648 return s->queue ? s->queue->recvtime : 0;
649}
650
651static int rtp_parse_queued_packet(RTPDemuxContext *s, AVPacket *pkt)
652{
653 int rv;
654 RTPPacket *next;
655
656 if (s->queue_len <= 0)
657 return -1;
658
659 if (!has_next_packet(s))
660 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
661 "RTP: missed %d packets\n", s->queue->seq - s->seq - 1);
662
663 /* Parse the first packet in the queue, and dequeue it */
664 rv = rtp_parse_packet_internal(s, pkt, s->queue->buf, s->queue->len);
665 next = s->queue->next;
666 av_free(s->queue->buf);
667 av_free(s->queue);
668 s->queue = next;
669 s->queue_len--;
4ffff367 670 return rv;
58ee0991
MS
671}
672
4ffff367 673static int rtp_parse_one_packet(RTPDemuxContext *s, AVPacket *pkt,
02607418
MS
674 uint8_t **bufptr, int len)
675{
676 uint8_t* buf = bufptr ? *bufptr : NULL;
677 int ret, flags = 0;
678 uint32_t timestamp;
679 int rv= 0;
680
681 if (!buf) {
f6e138b4
MS
682 /* If parsing of the previous packet actually returned 0 or an error,
683 * there's nothing more to be parsed from that packet, but we may have
58ee0991 684 * indicated that we can return the next enqueued packet. */
f6e138b4 685 if (s->prev_ret <= 0)
58ee0991 686 return rtp_parse_queued_packet(s, pkt);
02607418
MS
687 /* return the next packets, if any */
688 if(s->st && s->parse_packet) {
689 /* timestamp should be overwritten by parse_packet, if not,
690 * the packet is left with pts == AV_NOPTS_VALUE */
691 timestamp = RTP_NOTS_VALUE;
692 rv= s->parse_packet(s->ic, s->dynamic_protocol_context,
693 s->st, pkt, &timestamp, NULL, 0, flags);
694 finalize_packet(s, pkt, timestamp);
4ffff367 695 return rv;
02607418
MS
696 } else {
697 // TODO: Move to a dynamic packet handler (like above)
4ffff367 698 if (s->read_buf_index >= s->read_buf_size)
91ec7aea 699 return AVERROR(EAGAIN);
02607418
MS
700 ret = ff_mpegts_parse_packet(s->ts, pkt, s->buf + s->read_buf_index,
701 s->read_buf_size - s->read_buf_index);
4ffff367 702 if (ret < 0)
946df059 703 return AVERROR(EAGAIN);
02607418
MS
704 s->read_buf_index += ret;
705 if (s->read_buf_index < s->read_buf_size)
706 return 1;
4ffff367
MS
707 else
708 return 0;
02607418
MS
709 }
710 }
711
712 if (len < 12)
713 return -1;
714
715 if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
716 return -1;
298a587f 717 if (RTP_PT_IS_RTCP(buf[1])) {
02607418
MS
718 return rtcp_parse_packet(s, buf, len);
719 }
720
65cdee9c 721 if ((s->seq == 0 && !s->queue) || s->queue_size <= 1) {
58ee0991
MS
722 /* First packet, or no reordering */
723 return rtp_parse_packet_internal(s, pkt, buf, len);
724 } else {
725 uint16_t seq = AV_RB16(buf + 2);
726 int16_t diff = seq - s->seq;
727 if (diff < 0) {
728 /* Packet older than the previously emitted one, drop */
729 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
730 "RTP: dropping old packet received too late\n");
731 return -1;
732 } else if (diff <= 1) {
733 /* Correct packet */
734 rv = rtp_parse_packet_internal(s, pkt, buf, len);
4ffff367 735 return rv;
58ee0991
MS
736 } else {
737 /* Still missing some packet, enqueue this one. */
738 enqueue_packet(s, buf, len);
739 *bufptr = NULL;
740 /* Return the first enqueued packet if the queue is full,
741 * even if we're missing something */
742 if (s->queue_len >= s->queue_size)
743 return rtp_parse_queued_packet(s, pkt);
744 return -1;
745 }
746 }
02607418
MS
747}
748
4ffff367
MS
749/**
750 * Parse an RTP or RTCP packet directly sent as a buffer.
751 * @param s RTP parse context.
752 * @param pkt returned packet
753 * @param bufptr pointer to the input buffer or NULL to read the next packets
754 * @param len buffer len
755 * @return 0 if a packet is returned, 1 if a packet is returned and more can follow
756 * (use buf as NULL to read the next). -1 if no packet (error or no more packet).
757 */
bfc6db44
MS
758int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
759 uint8_t **bufptr, int len)
4ffff367
MS
760{
761 int rv = rtp_parse_one_packet(s, pkt, bufptr, len);
762 s->prev_ret = rv;
d678a6fd
MS
763 while (rv == AVERROR(EAGAIN) && has_next_packet(s))
764 rv = rtp_parse_queued_packet(s, pkt);
4ffff367
MS
765 return rv ? rv : has_next_packet(s);
766}
767
bfc6db44 768void ff_rtp_parse_close(RTPDemuxContext *s)
8eb793c4 769{
58ee0991 770 ff_rtp_reset_packet_queue(s);
8eb793c4 771 if (!strcmp(ff_rtp_enc_name(s->payload_type), "MP2T")) {
9125806e 772 ff_mpegts_parse_close(s->ts);
8eb793c4
LA
773 }
774 av_free(s);
775}
016bc031
JA
776
777int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
778 int (*parse_fmtp)(AVStream *stream,
779 PayloadContext *data,
780 char *attr, char *value))
781{
782 char attr[256];
824535e3 783 char *value;
016bc031 784 int res;
824535e3
JA
785 int value_size = strlen(p) + 1;
786
787 if (!(value = av_malloc(value_size))) {
c3e15f7b 788 av_log(NULL, AV_LOG_ERROR, "Failed to allocate data for FMTP.");
824535e3
JA
789 return AVERROR(ENOMEM);
790 }
016bc031
JA
791
792 // remove protocol identifier
793 while (*p && *p == ' ') p++; // strip spaces
794 while (*p && *p != ' ') p++; // eat protocol identifier
795 while (*p && *p == ' ') p++; // strip trailing spaces
796
797 while (ff_rtsp_next_attr_and_value(&p,
798 attr, sizeof(attr),
824535e3 799 value, value_size)) {
016bc031
JA
800
801 res = parse_fmtp(stream, data, attr, value);
824535e3
JA
802 if (res < 0 && res != AVERROR_PATCHWELCOME) {
803 av_free(value);
016bc031 804 return res;
824535e3 805 }
016bc031 806 }
824535e3 807 av_free(value);
016bc031
JA
808 return 0;
809}