rtpenc: Add support for packetizing speex
[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
69ad22c7 46static RTPDynamicProtocolHandler ff_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
8eb793c4 52/* statistics functions */
119cc033 53static RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler= NULL;
8eb793c4 54
0369d2b0 55void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
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56{
57 handler->next= RTPFirstDynamicPayloadHandler;
58 RTPFirstDynamicPayloadHandler= handler;
59}
60
61void av_register_rtp_dynamic_payload_handlers(void)
62{
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63 ff_register_dynamic_payload_handler(&ff_mp4v_es_dynamic_handler);
64 ff_register_dynamic_payload_handler(&ff_mpeg4_generic_dynamic_handler);
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RB
65 ff_register_dynamic_payload_handler(&ff_amr_nb_dynamic_handler);
66 ff_register_dynamic_payload_handler(&ff_amr_wb_dynamic_handler);
45aa9080
RB
67 ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
68 ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
08bddfcd 69 ff_register_dynamic_payload_handler(&ff_h263_rfc2190_dynamic_handler);
0369d2b0 70 ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
89c39605 71 ff_register_dynamic_payload_handler(&ff_ilbc_dynamic_handler);
3c198154 72 ff_register_dynamic_payload_handler(&ff_jpeg_dynamic_handler);
e6327fba 73 ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
887af2aa 74 ff_register_dynamic_payload_handler(&ff_theora_dynamic_handler);
a59096e4 75 ff_register_dynamic_payload_handler(&ff_qdm2_dynamic_handler);
4449df6b 76 ff_register_dynamic_payload_handler(&ff_svq3_dynamic_handler);
1ddc176e 77 ff_register_dynamic_payload_handler(&ff_mp4a_latm_dynamic_handler);
51291e60 78 ff_register_dynamic_payload_handler(&ff_vp8_dynamic_handler);
35014efc 79 ff_register_dynamic_payload_handler(&ff_qcelp_dynamic_handler);
2eeefe20 80 ff_register_dynamic_payload_handler(&ff_realmedia_mp3_dynamic_handler);
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81
82 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
83 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfa_handler);
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84
85 ff_register_dynamic_payload_handler(&ff_qt_rtp_aud_handler);
86 ff_register_dynamic_payload_handler(&ff_qt_rtp_vid_handler);
87 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_aud_handler);
88 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_vid_handler);
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MS
89
90 ff_register_dynamic_payload_handler(&ff_g726_16_dynamic_handler);
91 ff_register_dynamic_payload_handler(&ff_g726_24_dynamic_handler);
92 ff_register_dynamic_payload_handler(&ff_g726_32_dynamic_handler);
93 ff_register_dynamic_payload_handler(&ff_g726_40_dynamic_handler);
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94}
95
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MS
96RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
97 enum AVMediaType codec_type)
98{
99 RTPDynamicProtocolHandler *handler;
100 for (handler = RTPFirstDynamicPayloadHandler;
101 handler; handler = handler->next)
bb3244de 102 if (!av_strcasecmp(name, handler->enc_name) &&
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MS
103 codec_type == handler->codec_type)
104 return handler;
105 return NULL;
106}
107
108RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
109 enum AVMediaType codec_type)
110{
111 RTPDynamicProtocolHandler *handler;
112 for (handler = RTPFirstDynamicPayloadHandler;
113 handler; handler = handler->next)
114 if (handler->static_payload_id && handler->static_payload_id == id &&
115 codec_type == handler->codec_type)
116 return handler;
117 return NULL;
118}
119
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120static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf, int len)
121{
ff328c02 122 int payload_len;
07b77fe3
JB
123 while (len >= 4) {
124 payload_len = FFMIN(len, (AV_RB16(buf + 2) + 1) * 4);
125
ff328c02
JA
126 switch (buf[1]) {
127 case RTCP_SR:
07b77fe3 128 if (payload_len < 20) {
ff328c02
JA
129 av_log(NULL, AV_LOG_ERROR, "Invalid length for RTCP SR packet\n");
130 return AVERROR_INVALIDDATA;
131 }
ff328c02 132
682d28a9 133 s->last_rtcp_ntp_time = AV_RB64(buf + 8);
682d28a9 134 s->last_rtcp_timestamp = AV_RB32(buf + 16);
3a1cdcc7
MS
135 if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
136 s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
137 if (!s->base_timestamp)
138 s->base_timestamp = s->last_rtcp_timestamp;
139 s->rtcp_ts_offset = s->last_rtcp_timestamp - s->base_timestamp;
140 }
ff328c02 141
ff328c02 142 break;
b20359f5
JA
143 case RTCP_BYE:
144 return -RTCP_BYE;
ff328c02 145 }
07b77fe3
JB
146
147 buf += payload_len;
148 len -= payload_len;
ff328c02 149 }
b20359f5 150 return -1;
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151}
152
153#define RTP_SEQ_MOD (1<<16)
154
155/**
156* called on parse open packet
157*/
158static void rtp_init_statistics(RTPStatistics *s, uint16_t base_sequence) // called on parse open packet.
159{
160 memset(s, 0, sizeof(RTPStatistics));
161 s->max_seq= base_sequence;
162 s->probation= 1;
163}
164
165/**
166* called whenever there is a large jump in sequence numbers, or when they get out of probation...
167*/
168static void rtp_init_sequence(RTPStatistics *s, uint16_t seq)
169{
170 s->max_seq= seq;
171 s->cycles= 0;
172 s->base_seq= seq -1;
173 s->bad_seq= RTP_SEQ_MOD + 1;
174 s->received= 0;
175 s->expected_prior= 0;
176 s->received_prior= 0;
177 s->jitter= 0;
178 s->transit= 0;
179}
180
181/**
182* returns 1 if we should handle this packet.
183*/
184static int rtp_valid_packet_in_sequence(RTPStatistics *s, uint16_t seq)
185{
186 uint16_t udelta= seq - s->max_seq;
187 const int MAX_DROPOUT= 3000;
188 const int MAX_MISORDER = 100;
189 const int MIN_SEQUENTIAL = 2;
190
191 /* source not valid until MIN_SEQUENTIAL packets with sequence seq. numbers have been received */
192 if(s->probation)
193 {
194 if(seq==s->max_seq + 1) {
195 s->probation--;
196 s->max_seq= seq;
197 if(s->probation==0) {
198 rtp_init_sequence(s, seq);
199 s->received++;
200 return 1;
201 }
202 } else {
203 s->probation= MIN_SEQUENTIAL - 1;
204 s->max_seq = seq;
205 }
206 } else if (udelta < MAX_DROPOUT) {
207 // in order, with permissible gap
208 if(seq < s->max_seq) {
209 //sequence number wrapped; count antother 64k cycles
210 s->cycles += RTP_SEQ_MOD;
211 }
212 s->max_seq= seq;
213 } else if (udelta <= RTP_SEQ_MOD - MAX_MISORDER) {
214 // sequence made a large jump...
215 if(seq==s->bad_seq) {
216 // two sequential packets-- assume that the other side restarted without telling us; just resync.
217 rtp_init_sequence(s, seq);
218 } else {
219 s->bad_seq= (seq + 1) & (RTP_SEQ_MOD-1);
220 return 0;
221 }
222 } else {
223 // duplicate or reordered packet...
224 }
225 s->received++;
226 return 1;
227}
228
bfc6db44 229int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
8eb793c4 230{
ae628ec1 231 AVIOContext *pb;
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232 uint8_t *buf;
233 int len;
234 int rtcp_bytes;
235 RTPStatistics *stats= &s->statistics;
236 uint32_t lost;
237 uint32_t extended_max;
238 uint32_t expected_interval;
239 uint32_t received_interval;
240 uint32_t lost_interval;
241 uint32_t expected;
242 uint32_t fraction;
243 uint64_t ntp_time= s->last_rtcp_ntp_time; // TODO: Get local ntp time?
244
245 if (!s->rtp_ctx || (count < 1))
246 return -1;
247
248 /* TODO: I think this is way too often; RFC 1889 has algorithm for this */
249 /* XXX: mpeg pts hardcoded. RTCP send every 0.5 seconds */
250 s->octet_count += count;
251 rtcp_bytes = ((s->octet_count - s->last_octet_count) * RTCP_TX_RATIO_NUM) /
252 RTCP_TX_RATIO_DEN;
253 rtcp_bytes /= 50; // mmu_man: that's enough for me... VLC sends much less btw !?
254 if (rtcp_bytes < 28)
255 return -1;
256 s->last_octet_count = s->octet_count;
257
b92c5452 258 if (avio_open_dyn_buf(&pb) < 0)
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259 return -1;
260
261 // Receiver Report
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262 avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
263 avio_w8(pb, RTCP_RR);
264 avio_wb16(pb, 7); /* length in words - 1 */
952139a3 265 // our own SSRC: we use the server's SSRC + 1 to avoid conflicts
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266 avio_wb32(pb, s->ssrc + 1);
267 avio_wb32(pb, s->ssrc); // server SSRC
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268 // some placeholders we should really fill...
269 // RFC 1889/p64
270 extended_max= stats->cycles + stats->max_seq;
271 expected= extended_max - stats->base_seq + 1;
272 lost= expected - stats->received;
273 lost= FFMIN(lost, 0xffffff); // clamp it since it's only 24 bits...
274 expected_interval= expected - stats->expected_prior;
275 stats->expected_prior= expected;
276 received_interval= stats->received - stats->received_prior;
277 stats->received_prior= stats->received;
278 lost_interval= expected_interval - received_interval;
279 if (expected_interval==0 || lost_interval<=0) fraction= 0;
280 else fraction = (lost_interval<<8)/expected_interval;
281
282 fraction= (fraction<<24) | lost;
283
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284 avio_wb32(pb, fraction); /* 8 bits of fraction, 24 bits of total packets lost */
285 avio_wb32(pb, extended_max); /* max sequence received */
286 avio_wb32(pb, stats->jitter>>4); /* jitter */
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287
288 if(s->last_rtcp_ntp_time==AV_NOPTS_VALUE)
289 {
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290 avio_wb32(pb, 0); /* last SR timestamp */
291 avio_wb32(pb, 0); /* delay since last SR */
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292 } else {
293 uint32_t middle_32_bits= s->last_rtcp_ntp_time>>16; // this is valid, right? do we need to handle 64 bit values special?
294 uint32_t delay_since_last= ntp_time - s->last_rtcp_ntp_time;
295
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296 avio_wb32(pb, middle_32_bits); /* last SR timestamp */
297 avio_wb32(pb, delay_since_last); /* delay since last SR */
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298 }
299
300 // CNAME
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301 avio_w8(pb, (RTP_VERSION << 6) + 1); /* 1 report block */
302 avio_w8(pb, RTCP_SDES);
8eb793c4 303 len = strlen(s->hostname);
77eb5504 304 avio_wb16(pb, (6 + len + 3) / 4); /* length in words - 1 */
ad7beb2c 305 avio_wb32(pb, s->ssrc + 1);
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306 avio_w8(pb, 0x01);
307 avio_w8(pb, len);
308 avio_write(pb, s->hostname, len);
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309 // padding
310 for (len = (6 + len) % 4; len % 4; len++) {
77eb5504 311 avio_w8(pb, 0);
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312 }
313
b7f2fdde 314 avio_flush(pb);
6dc7d80d 315 len = avio_close_dyn_buf(pb, &buf);
8eb793c4 316 if ((len > 0) && buf) {
5e1166b3 317 int av_unused result;
dfd2a005 318 av_dlog(s->ic, "sending %d bytes of RR\n", len);
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AK
319 result= ffurl_write(s->rtp_ctx, buf, len);
320 av_dlog(s->ic, "result from ffurl_write: %d\n", result);
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321 av_free(buf);
322 }
323 return 0;
324}
325
bfc6db44 326void ff_rtp_send_punch_packets(URLContext* rtp_handle)
9c8fa20d 327{
ae628ec1 328 AVIOContext *pb;
9c8fa20d
MS
329 uint8_t *buf;
330 int len;
331
332 /* Send a small RTP packet */
b92c5452 333 if (avio_open_dyn_buf(&pb) < 0)
9c8fa20d
MS
334 return;
335
77eb5504
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336 avio_w8(pb, (RTP_VERSION << 6));
337 avio_w8(pb, 0); /* Payload type */
338 avio_wb16(pb, 0); /* Seq */
339 avio_wb32(pb, 0); /* Timestamp */
340 avio_wb32(pb, 0); /* SSRC */
9c8fa20d 341
b7f2fdde 342 avio_flush(pb);
6dc7d80d 343 len = avio_close_dyn_buf(pb, &buf);
9c8fa20d 344 if ((len > 0) && buf)
925e908b 345 ffurl_write(rtp_handle, buf, len);
9c8fa20d
MS
346 av_free(buf);
347
348 /* Send a minimal RTCP RR */
b92c5452 349 if (avio_open_dyn_buf(&pb) < 0)
9c8fa20d
MS
350 return;
351
77eb5504
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352 avio_w8(pb, (RTP_VERSION << 6));
353 avio_w8(pb, RTCP_RR); /* receiver report */
354 avio_wb16(pb, 1); /* length in words - 1 */
355 avio_wb32(pb, 0); /* our own SSRC */
9c8fa20d 356
b7f2fdde 357 avio_flush(pb);
6dc7d80d 358 len = avio_close_dyn_buf(pb, &buf);
9c8fa20d 359 if ((len > 0) && buf)
925e908b 360 ffurl_write(rtp_handle, buf, len);
9c8fa20d
MS
361 av_free(buf);
362}
363
364
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365/**
366 * open a new RTP parse context for stream 'st'. 'st' can be NULL for
367 * MPEG2TS streams to indicate that they should be demuxed inside the
36ef5369 368 * rtp demux (otherwise AV_CODEC_ID_MPEG2TS packets are returned)
8eb793c4 369 */
bfc6db44 370RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, int queue_size)
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371{
372 RTPDemuxContext *s;
373
374 s = av_mallocz(sizeof(RTPDemuxContext));
375 if (!s)
376 return NULL;
377 s->payload_type = payload_type;
378 s->last_rtcp_ntp_time = AV_NOPTS_VALUE;
2cab6b48 379 s->first_rtcp_ntp_time = AV_NOPTS_VALUE;
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380 s->ic = s1;
381 s->st = st;
58ee0991 382 s->queue_size = queue_size;
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383 rtp_init_statistics(&s->statistics, 0); // do we know the initial sequence from sdp?
384 if (!strcmp(ff_rtp_enc_name(payload_type), "MP2T")) {
9125806e 385 s->ts = ff_mpegts_parse_open(s->ic);
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386 if (s->ts == NULL) {
387 av_free(s);
388 return NULL;
389 }
45600148 390 } else if (st) {
8eb793c4 391 switch(st->codec->codec_id) {
36ef5369
AK
392 case AV_CODEC_ID_MPEG1VIDEO:
393 case AV_CODEC_ID_MPEG2VIDEO:
394 case AV_CODEC_ID_MP2:
395 case AV_CODEC_ID_MP3:
396 case AV_CODEC_ID_MPEG4:
397 case AV_CODEC_ID_H263:
398 case AV_CODEC_ID_H264:
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LA
399 st->need_parsing = AVSTREAM_PARSE_FULL;
400 break;
36ef5369 401 case AV_CODEC_ID_VORBIS:
5602a464
JR
402 st->need_parsing = AVSTREAM_PARSE_HEADERS;
403 break;
36ef5369 404 case AV_CODEC_ID_ADPCM_G722:
0048a2a8
MS
405 /* According to RFC 3551, the stream clock rate is 8000
406 * even if the sample rate is 16000. */
407 if (st->codec->sample_rate == 8000)
408 st->codec->sample_rate = 16000;
409 break;
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410 default:
411 break;
412 }
413 }
414 // needed to send back RTCP RR in RTSP sessions
415 s->rtp_ctx = rtpc;
416 gethostname(s->hostname, sizeof(s->hostname));
417 return s;
418}
419
99a1d191 420void
bfc6db44
MS
421ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
422 RTPDynamicProtocolHandler *handler)
99a1d191
RB
423{
424 s->dynamic_protocol_context = ctx;
425 s->parse_packet = handler->parse_packet;
426}
427
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428/**
429 * This was the second switch in rtp_parse packet. Normalizes time, if required, sets stream_index, etc.
430 */
431static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestamp)
432{
79d482b1
MS
433 if (pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE)
434 return; /* Timestamp already set by depacketizer */
b8a1b880
JB
435 if (timestamp == RTP_NOTS_VALUE)
436 return;
437
525c5b08 438 if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE && s->ic->nb_streams > 1) {
fba7815d
LA
439 int64_t addend;
440 int delta_timestamp;
441
442 /* compute pts from timestamp with received ntp_time */
443 delta_timestamp = timestamp - s->last_rtcp_timestamp;
444 /* convert to the PTS timebase */
2cab6b48 445 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
446 pkt->pts = s->range_start_offset + s->rtcp_ts_offset + addend +
447 delta_timestamp;
448 return;
fba7815d 449 }
b8a1b880 450
3a1cdcc7
MS
451 if (!s->base_timestamp)
452 s->base_timestamp = timestamp;
12348ca2
JB
453 /* assume that the difference is INT32_MIN < x < INT32_MAX, but allow the first timestamp to exceed INT32_MAX */
454 if (!s->timestamp)
455 s->unwrapped_timestamp += timestamp;
456 else
457 s->unwrapped_timestamp += (int32_t)(timestamp - s->timestamp);
458 s->timestamp = timestamp;
459 pkt->pts = s->unwrapped_timestamp + s->range_start_offset - s->base_timestamp;
8eb793c4
LA
460}
461
02607418
MS
462static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,
463 const uint8_t *buf, int len)
8eb793c4
LA
464{
465 unsigned int ssrc, h;
f841a0fc 466 int payload_type, seq, ret, flags = 0;
9446b4bb 467 int ext;
8eb793c4
LA
468 AVStream *st;
469 uint32_t timestamp;
470 int rv= 0;
471
9446b4bb 472 ext = buf[0] & 0x10;
8eb793c4 473 payload_type = buf[1] & 0x7f;
144ae29d
RB
474 if (buf[1] & 0x80)
475 flags |= RTP_FLAG_MARKER;
8eb793c4
LA
476 seq = AV_RB16(buf + 2);
477 timestamp = AV_RB32(buf + 4);
478 ssrc = AV_RB32(buf + 8);
479 /* store the ssrc in the RTPDemuxContext */
480 s->ssrc = ssrc;
481
482 /* NOTE: we can handle only one payload type */
483 if (s->payload_type != payload_type)
484 return -1;
485
486 st = s->st;
487 // only do something with this if all the rtp checks pass...
488 if(!rtp_valid_packet_in_sequence(&s->statistics, seq))
489 {
490 av_log(st?st->codec:NULL, AV_LOG_ERROR, "RTP: PT=%02x: bad cseq %04x expected=%04x\n",
491 payload_type, seq, ((s->seq + 1) & 0xffff));
492 return -1;
493 }
494
4838cdab
MS
495 if (buf[0] & 0x20) {
496 int padding = buf[len - 1];
497 if (len >= 12 + padding)
498 len -= padding;
499 }
500
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LA
501 s->seq = seq;
502 len -= 12;
503 buf += 12;
504
9446b4bb
RS
505 /* RFC 3550 Section 5.3.1 RTP Header Extension handling */
506 if (ext) {
507 if (len < 4)
508 return -1;
509 /* calculate the header extension length (stored as number
510 * of 32-bit words) */
511 ext = (AV_RB16(buf + 2) + 1) << 2;
512
513 if (len < ext)
514 return -1;
515 // skip past RTP header extension
516 len -= ext;
517 buf += ext;
518 }
519
8eb793c4
LA
520 if (!st) {
521 /* specific MPEG2TS demux support */
9125806e 522 ret = ff_mpegts_parse_packet(s->ts, pkt, buf, len);
946df059
MS
523 /* The only error that can be returned from ff_mpegts_parse_packet
524 * is "no more data to return from the provided buffer", so return
525 * AVERROR(EAGAIN) for all errors */
4ffff367 526 if (ret < 0)
946df059 527 return AVERROR(EAGAIN);
8eb793c4
LA
528 if (ret < len) {
529 s->read_buf_size = len - ret;
530 memcpy(s->buf, buf + ret, s->read_buf_size);
531 s->read_buf_index = 0;
532 return 1;
533 }
f3e71942 534 return 0;
b4e3330c 535 } else if (s->parse_packet) {
1a45a9f4 536 rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
9b932b8a 537 s->st, pkt, &timestamp, buf, len, flags);
8eb793c4
LA
538 } else {
539 // at this point, the RTP header has been stripped; This is ASSUMING that there is only 1 CSRC, which in't wise.
540 switch(st->codec->codec_id) {
36ef5369
AK
541 case AV_CODEC_ID_MP2:
542 case AV_CODEC_ID_MP3:
8eb793c4
LA
543 /* better than nothing: skip mpeg audio RTP header */
544 if (len <= 4)
545 return -1;
546 h = AV_RB32(buf);
547 len -= 4;
548 buf += 4;
549 av_new_packet(pkt, len);
550 memcpy(pkt->data, buf, len);
551 break;
36ef5369
AK
552 case AV_CODEC_ID_MPEG1VIDEO:
553 case AV_CODEC_ID_MPEG2VIDEO:
8eb793c4
LA
554 /* better than nothing: skip mpeg video RTP header */
555 if (len <= 4)
556 return -1;
557 h = AV_RB32(buf);
558 buf += 4;
559 len -= 4;
560 if (h & (1 << 26)) {
561 /* mpeg2 */
562 if (len <= 4)
563 return -1;
564 buf += 4;
565 len -= 4;
566 }
567 av_new_packet(pkt, len);
568 memcpy(pkt->data, buf, len);
569 break;
8eb793c4 570 default:
f739b36d
RB
571 av_new_packet(pkt, len);
572 memcpy(pkt->data, buf, len);
8eb793c4
LA
573 break;
574 }
eafb17d1
RB
575
576 pkt->stream_index = st->index;
f3e71942 577 }
8eb793c4 578
95f03cf3
RB
579 // now perform timestamp things....
580 finalize_packet(s, pkt, timestamp);
f3e71942 581
8eb793c4
LA
582 return rv;
583}
584
58ee0991
MS
585void ff_rtp_reset_packet_queue(RTPDemuxContext *s)
586{
587 while (s->queue) {
588 RTPPacket *next = s->queue->next;
589 av_free(s->queue->buf);
590 av_free(s->queue);
591 s->queue = next;
592 }
593 s->seq = 0;
594 s->queue_len = 0;
595 s->prev_ret = 0;
596}
597
598static void enqueue_packet(RTPDemuxContext *s, uint8_t *buf, int len)
599{
600 uint16_t seq = AV_RB16(buf + 2);
601 RTPPacket *cur = s->queue, *prev = NULL, *packet;
602
603 /* Find the correct place in the queue to insert the packet */
604 while (cur) {
605 int16_t diff = seq - cur->seq;
606 if (diff < 0)
607 break;
608 prev = cur;
609 cur = cur->next;
610 }
611
612 packet = av_mallocz(sizeof(*packet));
613 if (!packet)
614 return;
615 packet->recvtime = av_gettime();
616 packet->seq = seq;
617 packet->len = len;
618 packet->buf = buf;
619 packet->next = cur;
620 if (prev)
621 prev->next = packet;
622 else
623 s->queue = packet;
624 s->queue_len++;
625}
626
627static int has_next_packet(RTPDemuxContext *s)
628{
ddcf8411 629 return s->queue && s->queue->seq == (uint16_t) (s->seq + 1);
58ee0991
MS
630}
631
632int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s)
633{
634 return s->queue ? s->queue->recvtime : 0;
635}
636
637static int rtp_parse_queued_packet(RTPDemuxContext *s, AVPacket *pkt)
638{
639 int rv;
640 RTPPacket *next;
641
642 if (s->queue_len <= 0)
643 return -1;
644
645 if (!has_next_packet(s))
646 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
647 "RTP: missed %d packets\n", s->queue->seq - s->seq - 1);
648
649 /* Parse the first packet in the queue, and dequeue it */
650 rv = rtp_parse_packet_internal(s, pkt, s->queue->buf, s->queue->len);
651 next = s->queue->next;
652 av_free(s->queue->buf);
653 av_free(s->queue);
654 s->queue = next;
655 s->queue_len--;
4ffff367 656 return rv;
58ee0991
MS
657}
658
4ffff367 659static int rtp_parse_one_packet(RTPDemuxContext *s, AVPacket *pkt,
02607418
MS
660 uint8_t **bufptr, int len)
661{
662 uint8_t* buf = bufptr ? *bufptr : NULL;
663 int ret, flags = 0;
664 uint32_t timestamp;
665 int rv= 0;
666
667 if (!buf) {
f6e138b4
MS
668 /* If parsing of the previous packet actually returned 0 or an error,
669 * there's nothing more to be parsed from that packet, but we may have
58ee0991 670 * indicated that we can return the next enqueued packet. */
f6e138b4 671 if (s->prev_ret <= 0)
58ee0991 672 return rtp_parse_queued_packet(s, pkt);
02607418
MS
673 /* return the next packets, if any */
674 if(s->st && s->parse_packet) {
675 /* timestamp should be overwritten by parse_packet, if not,
676 * the packet is left with pts == AV_NOPTS_VALUE */
677 timestamp = RTP_NOTS_VALUE;
678 rv= s->parse_packet(s->ic, s->dynamic_protocol_context,
679 s->st, pkt, &timestamp, NULL, 0, flags);
680 finalize_packet(s, pkt, timestamp);
4ffff367 681 return rv;
02607418
MS
682 } else {
683 // TODO: Move to a dynamic packet handler (like above)
4ffff367 684 if (s->read_buf_index >= s->read_buf_size)
91ec7aea 685 return AVERROR(EAGAIN);
02607418
MS
686 ret = ff_mpegts_parse_packet(s->ts, pkt, s->buf + s->read_buf_index,
687 s->read_buf_size - s->read_buf_index);
4ffff367 688 if (ret < 0)
946df059 689 return AVERROR(EAGAIN);
02607418
MS
690 s->read_buf_index += ret;
691 if (s->read_buf_index < s->read_buf_size)
692 return 1;
4ffff367
MS
693 else
694 return 0;
02607418
MS
695 }
696 }
697
698 if (len < 12)
699 return -1;
700
701 if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
702 return -1;
298a587f 703 if (RTP_PT_IS_RTCP(buf[1])) {
02607418
MS
704 return rtcp_parse_packet(s, buf, len);
705 }
706
65cdee9c 707 if ((s->seq == 0 && !s->queue) || s->queue_size <= 1) {
58ee0991
MS
708 /* First packet, or no reordering */
709 return rtp_parse_packet_internal(s, pkt, buf, len);
710 } else {
711 uint16_t seq = AV_RB16(buf + 2);
712 int16_t diff = seq - s->seq;
713 if (diff < 0) {
714 /* Packet older than the previously emitted one, drop */
715 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
716 "RTP: dropping old packet received too late\n");
717 return -1;
718 } else if (diff <= 1) {
719 /* Correct packet */
720 rv = rtp_parse_packet_internal(s, pkt, buf, len);
4ffff367 721 return rv;
58ee0991
MS
722 } else {
723 /* Still missing some packet, enqueue this one. */
724 enqueue_packet(s, buf, len);
725 *bufptr = NULL;
726 /* Return the first enqueued packet if the queue is full,
727 * even if we're missing something */
728 if (s->queue_len >= s->queue_size)
729 return rtp_parse_queued_packet(s, pkt);
730 return -1;
731 }
732 }
02607418
MS
733}
734
4ffff367
MS
735/**
736 * Parse an RTP or RTCP packet directly sent as a buffer.
737 * @param s RTP parse context.
738 * @param pkt returned packet
739 * @param bufptr pointer to the input buffer or NULL to read the next packets
740 * @param len buffer len
741 * @return 0 if a packet is returned, 1 if a packet is returned and more can follow
742 * (use buf as NULL to read the next). -1 if no packet (error or no more packet).
743 */
bfc6db44
MS
744int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
745 uint8_t **bufptr, int len)
4ffff367
MS
746{
747 int rv = rtp_parse_one_packet(s, pkt, bufptr, len);
748 s->prev_ret = rv;
d678a6fd
MS
749 while (rv == AVERROR(EAGAIN) && has_next_packet(s))
750 rv = rtp_parse_queued_packet(s, pkt);
4ffff367
MS
751 return rv ? rv : has_next_packet(s);
752}
753
bfc6db44 754void ff_rtp_parse_close(RTPDemuxContext *s)
8eb793c4 755{
58ee0991 756 ff_rtp_reset_packet_queue(s);
8eb793c4 757 if (!strcmp(ff_rtp_enc_name(s->payload_type), "MP2T")) {
9125806e 758 ff_mpegts_parse_close(s->ts);
8eb793c4
LA
759 }
760 av_free(s);
761}
016bc031
JA
762
763int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
764 int (*parse_fmtp)(AVStream *stream,
765 PayloadContext *data,
766 char *attr, char *value))
767{
768 char attr[256];
824535e3 769 char *value;
016bc031 770 int res;
824535e3
JA
771 int value_size = strlen(p) + 1;
772
773 if (!(value = av_malloc(value_size))) {
774 av_log(stream, AV_LOG_ERROR, "Failed to allocate data for FMTP.");
775 return AVERROR(ENOMEM);
776 }
016bc031
JA
777
778 // remove protocol identifier
779 while (*p && *p == ' ') p++; // strip spaces
780 while (*p && *p != ' ') p++; // eat protocol identifier
781 while (*p && *p == ' ') p++; // strip trailing spaces
782
783 while (ff_rtsp_next_attr_and_value(&p,
784 attr, sizeof(attr),
824535e3 785 value, value_size)) {
016bc031
JA
786
787 res = parse_fmtp(stream, data, attr, value);
824535e3
JA
788 if (res < 0 && res != AVERROR_PATCHWELCOME) {
789 av_free(value);
016bc031 790 return res;
824535e3 791 }
016bc031 792 }
824535e3 793 av_free(value);
016bc031
JA
794 return 0;
795}