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00022 #include "libavutil/mathematics.h"
00023 #include "libavutil/avstring.h"
00024 #include "libavutil/time.h"
00025 #include "libavcodec/get_bits.h"
00026 #include "avformat.h"
00027 #include "mpegts.h"
00028 #include "network.h"
00029 #include "url.h"
00030 #include "rtpdec.h"
00031 #include "rtpdec_formats.h"
00032
00033 static RTPDynamicProtocolHandler realmedia_mp3_dynamic_handler = {
00034 .enc_name = "X-MP3-draft-00",
00035 .codec_type = AVMEDIA_TYPE_AUDIO,
00036 .codec_id = AV_CODEC_ID_MP3ADU,
00037 };
00038
00039 static RTPDynamicProtocolHandler speex_dynamic_handler = {
00040 .enc_name = "speex",
00041 .codec_type = AVMEDIA_TYPE_AUDIO,
00042 .codec_id = AV_CODEC_ID_SPEEX,
00043 };
00044
00045 static RTPDynamicProtocolHandler opus_dynamic_handler = {
00046 .enc_name = "opus",
00047 .codec_type = AVMEDIA_TYPE_AUDIO,
00048 .codec_id = AV_CODEC_ID_OPUS,
00049 };
00050
00051
00052 static RTPDynamicProtocolHandler *rtp_first_dynamic_payload_handler = NULL;
00053
00054 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
00055 {
00056 handler->next = rtp_first_dynamic_payload_handler;
00057 rtp_first_dynamic_payload_handler = handler;
00058 }
00059
00060 void av_register_rtp_dynamic_payload_handlers(void)
00061 {
00062 ff_register_dynamic_payload_handler(&ff_mp4v_es_dynamic_handler);
00063 ff_register_dynamic_payload_handler(&ff_mpeg4_generic_dynamic_handler);
00064 ff_register_dynamic_payload_handler(&ff_amr_nb_dynamic_handler);
00065 ff_register_dynamic_payload_handler(&ff_amr_wb_dynamic_handler);
00066 ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
00067 ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
00068 ff_register_dynamic_payload_handler(&ff_h263_rfc2190_dynamic_handler);
00069 ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
00070 ff_register_dynamic_payload_handler(&ff_ilbc_dynamic_handler);
00071 ff_register_dynamic_payload_handler(&ff_jpeg_dynamic_handler);
00072 ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
00073 ff_register_dynamic_payload_handler(&ff_theora_dynamic_handler);
00074 ff_register_dynamic_payload_handler(&ff_qdm2_dynamic_handler);
00075 ff_register_dynamic_payload_handler(&ff_svq3_dynamic_handler);
00076 ff_register_dynamic_payload_handler(&ff_mp4a_latm_dynamic_handler);
00077 ff_register_dynamic_payload_handler(&ff_vp8_dynamic_handler);
00078 ff_register_dynamic_payload_handler(&ff_qcelp_dynamic_handler);
00079 ff_register_dynamic_payload_handler(&realmedia_mp3_dynamic_handler);
00080 ff_register_dynamic_payload_handler(&speex_dynamic_handler);
00081 ff_register_dynamic_payload_handler(&opus_dynamic_handler);
00082
00083 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
00084 ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfa_handler);
00085
00086 ff_register_dynamic_payload_handler(&ff_qt_rtp_aud_handler);
00087 ff_register_dynamic_payload_handler(&ff_qt_rtp_vid_handler);
00088 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_aud_handler);
00089 ff_register_dynamic_payload_handler(&ff_quicktime_rtp_vid_handler);
00090
00091 ff_register_dynamic_payload_handler(&ff_g726_16_dynamic_handler);
00092 ff_register_dynamic_payload_handler(&ff_g726_24_dynamic_handler);
00093 ff_register_dynamic_payload_handler(&ff_g726_32_dynamic_handler);
00094 ff_register_dynamic_payload_handler(&ff_g726_40_dynamic_handler);
00095 }
00096
00097 RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
00098 enum AVMediaType codec_type)
00099 {
00100 RTPDynamicProtocolHandler *handler;
00101 for (handler = rtp_first_dynamic_payload_handler;
00102 handler; handler = handler->next)
00103 if (!av_strcasecmp(name, handler->enc_name) &&
00104 codec_type == handler->codec_type)
00105 return handler;
00106 return NULL;
00107 }
00108
00109 RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
00110 enum AVMediaType codec_type)
00111 {
00112 RTPDynamicProtocolHandler *handler;
00113 for (handler = rtp_first_dynamic_payload_handler;
00114 handler; handler = handler->next)
00115 if (handler->static_payload_id && handler->static_payload_id == id &&
00116 codec_type == handler->codec_type)
00117 return handler;
00118 return NULL;
00119 }
00120
00121 static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf,
00122 int len)
00123 {
00124 int payload_len;
00125 while (len >= 4) {
00126 payload_len = FFMIN(len, (AV_RB16(buf + 2) + 1) * 4);
00127
00128 switch (buf[1]) {
00129 case RTCP_SR:
00130 if (payload_len < 20) {
00131 av_log(NULL, AV_LOG_ERROR,
00132 "Invalid length for RTCP SR packet\n");
00133 return AVERROR_INVALIDDATA;
00134 }
00135
00136 s->last_rtcp_ntp_time = AV_RB64(buf + 8);
00137 s->last_rtcp_timestamp = AV_RB32(buf + 16);
00138 if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
00139 s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
00140 if (!s->base_timestamp)
00141 s->base_timestamp = s->last_rtcp_timestamp;
00142 s->rtcp_ts_offset = s->last_rtcp_timestamp - s->base_timestamp;
00143 }
00144
00145 break;
00146 case RTCP_BYE:
00147 return -RTCP_BYE;
00148 }
00149
00150 buf += payload_len;
00151 len -= payload_len;
00152 }
00153 return -1;
00154 }
00155
00156 #define RTP_SEQ_MOD (1 << 16)
00157
00158 static void rtp_init_statistics(RTPStatistics *s, uint16_t base_sequence)
00159 {
00160 memset(s, 0, sizeof(RTPStatistics));
00161 s->max_seq = base_sequence;
00162 s->probation = 1;
00163 }
00164
00165
00166
00167
00168
00169 static void rtp_init_sequence(RTPStatistics *s, uint16_t seq)
00170 {
00171 s->max_seq = seq;
00172 s->cycles = 0;
00173 s->base_seq = seq - 1;
00174 s->bad_seq = RTP_SEQ_MOD + 1;
00175 s->received = 0;
00176 s->expected_prior = 0;
00177 s->received_prior = 0;
00178 s->jitter = 0;
00179 s->transit = 0;
00180 }
00181
00182
00183 static int rtp_valid_packet_in_sequence(RTPStatistics *s, uint16_t seq)
00184 {
00185 uint16_t udelta = seq - s->max_seq;
00186 const int MAX_DROPOUT = 3000;
00187 const int MAX_MISORDER = 100;
00188 const int MIN_SEQUENTIAL = 2;
00189
00190
00191
00192 if (s->probation) {
00193 if (seq == s->max_seq + 1) {
00194 s->probation--;
00195 s->max_seq = seq;
00196 if (s->probation == 0) {
00197 rtp_init_sequence(s, seq);
00198 s->received++;
00199 return 1;
00200 }
00201 } else {
00202 s->probation = MIN_SEQUENTIAL - 1;
00203 s->max_seq = seq;
00204 }
00205 } else if (udelta < MAX_DROPOUT) {
00206
00207 if (seq < s->max_seq) {
00208
00209 s->cycles += RTP_SEQ_MOD;
00210 }
00211 s->max_seq = seq;
00212 } else if (udelta <= RTP_SEQ_MOD - MAX_MISORDER) {
00213
00214 if (seq == s->bad_seq) {
00215
00216
00217 rtp_init_sequence(s, seq);
00218 } else {
00219 s->bad_seq = (seq + 1) & (RTP_SEQ_MOD - 1);
00220 return 0;
00221 }
00222 } else {
00223
00224 }
00225 s->received++;
00226 return 1;
00227 }
00228
00229 int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
00230 {
00231 AVIOContext *pb;
00232 uint8_t *buf;
00233 int len;
00234 int rtcp_bytes;
00235 RTPStatistics *stats = &s->statistics;
00236 uint32_t lost;
00237 uint32_t extended_max;
00238 uint32_t expected_interval;
00239 uint32_t received_interval;
00240 uint32_t lost_interval;
00241 uint32_t expected;
00242 uint32_t fraction;
00243 uint64_t ntp_time = s->last_rtcp_ntp_time;
00244
00245 if (!s->rtp_ctx || (count < 1))
00246 return -1;
00247
00248
00249
00250 s->octet_count += count;
00251 rtcp_bytes = ((s->octet_count - s->last_octet_count) * RTCP_TX_RATIO_NUM) /
00252 RTCP_TX_RATIO_DEN;
00253 rtcp_bytes /= 50;
00254 if (rtcp_bytes < 28)
00255 return -1;
00256 s->last_octet_count = s->octet_count;
00257
00258 if (avio_open_dyn_buf(&pb) < 0)
00259 return -1;
00260
00261
00262 avio_w8(pb, (RTP_VERSION << 6) + 1);
00263 avio_w8(pb, RTCP_RR);
00264 avio_wb16(pb, 7);
00265
00266 avio_wb32(pb, s->ssrc + 1);
00267 avio_wb32(pb, s->ssrc);
00268
00269
00270 extended_max = stats->cycles + stats->max_seq;
00271 expected = extended_max - stats->base_seq + 1;
00272 lost = expected - stats->received;
00273 lost = FFMIN(lost, 0xffffff);
00274 expected_interval = expected - stats->expected_prior;
00275 stats->expected_prior = expected;
00276 received_interval = stats->received - stats->received_prior;
00277 stats->received_prior = stats->received;
00278 lost_interval = expected_interval - received_interval;
00279 if (expected_interval == 0 || lost_interval <= 0)
00280 fraction = 0;
00281 else
00282 fraction = (lost_interval << 8) / expected_interval;
00283
00284 fraction = (fraction << 24) | lost;
00285
00286 avio_wb32(pb, fraction);
00287 avio_wb32(pb, extended_max);
00288 avio_wb32(pb, stats->jitter >> 4);
00289
00290 if (s->last_rtcp_ntp_time == AV_NOPTS_VALUE) {
00291 avio_wb32(pb, 0);
00292 avio_wb32(pb, 0);
00293 } else {
00294 uint32_t middle_32_bits = s->last_rtcp_ntp_time >> 16;
00295 uint32_t delay_since_last = ntp_time - s->last_rtcp_ntp_time;
00296
00297 avio_wb32(pb, middle_32_bits);
00298 avio_wb32(pb, delay_since_last);
00299 }
00300
00301
00302 avio_w8(pb, (RTP_VERSION << 6) + 1);
00303 avio_w8(pb, RTCP_SDES);
00304 len = strlen(s->hostname);
00305 avio_wb16(pb, (6 + len + 3) / 4);
00306 avio_wb32(pb, s->ssrc + 1);
00307 avio_w8(pb, 0x01);
00308 avio_w8(pb, len);
00309 avio_write(pb, s->hostname, len);
00310
00311 for (len = (6 + len) % 4; len % 4; len++)
00312 avio_w8(pb, 0);
00313
00314 avio_flush(pb);
00315 len = avio_close_dyn_buf(pb, &buf);
00316 if ((len > 0) && buf) {
00317 int av_unused result;
00318 av_dlog(s->ic, "sending %d bytes of RR\n", len);
00319 result = ffurl_write(s->rtp_ctx, buf, len);
00320 av_dlog(s->ic, "result from ffurl_write: %d\n", result);
00321 av_free(buf);
00322 }
00323 return 0;
00324 }
00325
00326 void ff_rtp_send_punch_packets(URLContext *rtp_handle)
00327 {
00328 AVIOContext *pb;
00329 uint8_t *buf;
00330 int len;
00331
00332
00333 if (avio_open_dyn_buf(&pb) < 0)
00334 return;
00335
00336 avio_w8(pb, (RTP_VERSION << 6));
00337 avio_w8(pb, 0);
00338 avio_wb16(pb, 0);
00339 avio_wb32(pb, 0);
00340 avio_wb32(pb, 0);
00341
00342 avio_flush(pb);
00343 len = avio_close_dyn_buf(pb, &buf);
00344 if ((len > 0) && buf)
00345 ffurl_write(rtp_handle, buf, len);
00346 av_free(buf);
00347
00348
00349 if (avio_open_dyn_buf(&pb) < 0)
00350 return;
00351
00352 avio_w8(pb, (RTP_VERSION << 6));
00353 avio_w8(pb, RTCP_RR);
00354 avio_wb16(pb, 1);
00355 avio_wb32(pb, 0);
00356
00357 avio_flush(pb);
00358 len = avio_close_dyn_buf(pb, &buf);
00359 if ((len > 0) && buf)
00360 ffurl_write(rtp_handle, buf, len);
00361 av_free(buf);
00362 }
00363
00369 RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st,
00370 URLContext *rtpc, int payload_type,
00371 int queue_size)
00372 {
00373 RTPDemuxContext *s;
00374
00375 s = av_mallocz(sizeof(RTPDemuxContext));
00376 if (!s)
00377 return NULL;
00378 s->payload_type = payload_type;
00379 s->last_rtcp_ntp_time = AV_NOPTS_VALUE;
00380 s->first_rtcp_ntp_time = AV_NOPTS_VALUE;
00381 s->ic = s1;
00382 s->st = st;
00383 s->queue_size = queue_size;
00384 rtp_init_statistics(&s->statistics, 0);
00385 if (!strcmp(ff_rtp_enc_name(payload_type), "MP2T")) {
00386 s->ts = ff_mpegts_parse_open(s->ic);
00387 if (s->ts == NULL) {
00388 av_free(s);
00389 return NULL;
00390 }
00391 } else if (st) {
00392 switch (st->codec->codec_id) {
00393 case AV_CODEC_ID_MPEG1VIDEO:
00394 case AV_CODEC_ID_MPEG2VIDEO:
00395 case AV_CODEC_ID_MP2:
00396 case AV_CODEC_ID_MP3:
00397 case AV_CODEC_ID_MPEG4:
00398 case AV_CODEC_ID_H263:
00399 case AV_CODEC_ID_H264:
00400 st->need_parsing = AVSTREAM_PARSE_FULL;
00401 break;
00402 case AV_CODEC_ID_VORBIS:
00403 st->need_parsing = AVSTREAM_PARSE_HEADERS;
00404 break;
00405 case AV_CODEC_ID_ADPCM_G722:
00406
00407
00408 if (st->codec->sample_rate == 8000)
00409 st->codec->sample_rate = 16000;
00410 break;
00411 default:
00412 break;
00413 }
00414 }
00415
00416 s->rtp_ctx = rtpc;
00417 gethostname(s->hostname, sizeof(s->hostname));
00418 return s;
00419 }
00420
00421 void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
00422 RTPDynamicProtocolHandler *handler)
00423 {
00424 s->dynamic_protocol_context = ctx;
00425 s->parse_packet = handler->parse_packet;
00426 }
00427
00432 static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestamp)
00433 {
00434 if (pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE)
00435 return;
00436 if (timestamp == RTP_NOTS_VALUE)
00437 return;
00438
00439 if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE && s->ic->nb_streams > 1) {
00440 int64_t addend;
00441 int delta_timestamp;
00442
00443
00444 delta_timestamp = timestamp - s->last_rtcp_timestamp;
00445
00446 addend = av_rescale(s->last_rtcp_ntp_time - s->first_rtcp_ntp_time,
00447 s->st->time_base.den,
00448 (uint64_t) s->st->time_base.num << 32);
00449 pkt->pts = s->range_start_offset + s->rtcp_ts_offset + addend +
00450 delta_timestamp;
00451 return;
00452 }
00453
00454 if (!s->base_timestamp)
00455 s->base_timestamp = timestamp;
00456
00457
00458 if (!s->timestamp)
00459 s->unwrapped_timestamp += timestamp;
00460 else
00461 s->unwrapped_timestamp += (int32_t)(timestamp - s->timestamp);
00462 s->timestamp = timestamp;
00463 pkt->pts = s->unwrapped_timestamp + s->range_start_offset -
00464 s->base_timestamp;
00465 }
00466
00467 static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,
00468 const uint8_t *buf, int len)
00469 {
00470 unsigned int ssrc, h;
00471 int payload_type, seq, ret, flags = 0;
00472 int ext;
00473 AVStream *st;
00474 uint32_t timestamp;
00475 int rv = 0;
00476
00477 ext = buf[0] & 0x10;
00478 payload_type = buf[1] & 0x7f;
00479 if (buf[1] & 0x80)
00480 flags |= RTP_FLAG_MARKER;
00481 seq = AV_RB16(buf + 2);
00482 timestamp = AV_RB32(buf + 4);
00483 ssrc = AV_RB32(buf + 8);
00484
00485 s->ssrc = ssrc;
00486
00487
00488 if (s->payload_type != payload_type)
00489 return -1;
00490
00491 st = s->st;
00492
00493 if (!rtp_valid_packet_in_sequence(&s->statistics, seq)) {
00494 av_log(st ? st->codec : NULL, AV_LOG_ERROR,
00495 "RTP: PT=%02x: bad cseq %04x expected=%04x\n",
00496 payload_type, seq, ((s->seq + 1) & 0xffff));
00497 return -1;
00498 }
00499
00500 if (buf[0] & 0x20) {
00501 int padding = buf[len - 1];
00502 if (len >= 12 + padding)
00503 len -= padding;
00504 }
00505
00506 s->seq = seq;
00507 len -= 12;
00508 buf += 12;
00509
00510
00511 if (ext) {
00512 if (len < 4)
00513 return -1;
00514
00515
00516 ext = (AV_RB16(buf + 2) + 1) << 2;
00517
00518 if (len < ext)
00519 return -1;
00520
00521 len -= ext;
00522 buf += ext;
00523 }
00524
00525 if (!st) {
00526
00527 ret = ff_mpegts_parse_packet(s->ts, pkt, buf, len);
00528
00529
00530
00531 if (ret < 0)
00532 return AVERROR(EAGAIN);
00533 if (ret < len) {
00534 s->read_buf_size = FFMIN(len - ret, sizeof(s->buf));
00535 memcpy(s->buf, buf + ret, s->read_buf_size);
00536 s->read_buf_index = 0;
00537 return 1;
00538 }
00539 return 0;
00540 } else if (s->parse_packet) {
00541 rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
00542 s->st, pkt, ×tamp, buf, len, flags);
00543 } else {
00544
00545
00546 switch (st->codec->codec_id) {
00547 case AV_CODEC_ID_MP2:
00548 case AV_CODEC_ID_MP3:
00549
00550 if (len <= 4)
00551 return -1;
00552 h = AV_RB32(buf);
00553 len -= 4;
00554 buf += 4;
00555 if (av_new_packet(pkt, len) < 0)
00556 return AVERROR(ENOMEM);
00557 memcpy(pkt->data, buf, len);
00558 break;
00559 case AV_CODEC_ID_MPEG1VIDEO:
00560 case AV_CODEC_ID_MPEG2VIDEO:
00561
00562 if (len <= 4)
00563 return -1;
00564 h = AV_RB32(buf);
00565 buf += 4;
00566 len -= 4;
00567 if (h & (1 << 26)) {
00568
00569 if (len <= 4)
00570 return -1;
00571 buf += 4;
00572 len -= 4;
00573 }
00574 if (av_new_packet(pkt, len) < 0)
00575 return AVERROR(ENOMEM);
00576 memcpy(pkt->data, buf, len);
00577 break;
00578 default:
00579 if (av_new_packet(pkt, len) < 0)
00580 return AVERROR(ENOMEM);
00581 memcpy(pkt->data, buf, len);
00582 break;
00583 }
00584
00585 pkt->stream_index = st->index;
00586 }
00587
00588
00589 finalize_packet(s, pkt, timestamp);
00590
00591 return rv;
00592 }
00593
00594 void ff_rtp_reset_packet_queue(RTPDemuxContext *s)
00595 {
00596 while (s->queue) {
00597 RTPPacket *next = s->queue->next;
00598 av_free(s->queue->buf);
00599 av_free(s->queue);
00600 s->queue = next;
00601 }
00602 s->seq = 0;
00603 s->queue_len = 0;
00604 s->prev_ret = 0;
00605 }
00606
00607 static void enqueue_packet(RTPDemuxContext *s, uint8_t *buf, int len)
00608 {
00609 uint16_t seq = AV_RB16(buf + 2);
00610 RTPPacket *cur = s->queue, *prev = NULL, *packet;
00611
00612
00613 while (cur) {
00614 int16_t diff = seq - cur->seq;
00615 if (diff < 0)
00616 break;
00617 prev = cur;
00618 cur = cur->next;
00619 }
00620
00621 packet = av_mallocz(sizeof(*packet));
00622 if (!packet)
00623 return;
00624 packet->recvtime = av_gettime();
00625 packet->seq = seq;
00626 packet->len = len;
00627 packet->buf = buf;
00628 packet->next = cur;
00629 if (prev)
00630 prev->next = packet;
00631 else
00632 s->queue = packet;
00633 s->queue_len++;
00634 }
00635
00636 static int has_next_packet(RTPDemuxContext *s)
00637 {
00638 return s->queue && s->queue->seq == (uint16_t) (s->seq + 1);
00639 }
00640
00641 int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s)
00642 {
00643 return s->queue ? s->queue->recvtime : 0;
00644 }
00645
00646 static int rtp_parse_queued_packet(RTPDemuxContext *s, AVPacket *pkt)
00647 {
00648 int rv;
00649 RTPPacket *next;
00650
00651 if (s->queue_len <= 0)
00652 return -1;
00653
00654 if (!has_next_packet(s))
00655 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
00656 "RTP: missed %d packets\n", s->queue->seq - s->seq - 1);
00657
00658
00659 rv = rtp_parse_packet_internal(s, pkt, s->queue->buf, s->queue->len);
00660 next = s->queue->next;
00661 av_free(s->queue->buf);
00662 av_free(s->queue);
00663 s->queue = next;
00664 s->queue_len--;
00665 return rv;
00666 }
00667
00668 static int rtp_parse_one_packet(RTPDemuxContext *s, AVPacket *pkt,
00669 uint8_t **bufptr, int len)
00670 {
00671 uint8_t *buf = bufptr ? *bufptr : NULL;
00672 int ret, flags = 0;
00673 uint32_t timestamp;
00674 int rv = 0;
00675
00676 if (!buf) {
00677
00678
00679
00680 if (s->prev_ret <= 0)
00681 return rtp_parse_queued_packet(s, pkt);
00682
00683 if (s->st && s->parse_packet) {
00684
00685
00686 timestamp = RTP_NOTS_VALUE;
00687 rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
00688 s->st, pkt, ×tamp, NULL, 0, flags);
00689 finalize_packet(s, pkt, timestamp);
00690 return rv;
00691 } else {
00692
00693 if (s->read_buf_index >= s->read_buf_size)
00694 return AVERROR(EAGAIN);
00695 ret = ff_mpegts_parse_packet(s->ts, pkt, s->buf + s->read_buf_index,
00696 s->read_buf_size - s->read_buf_index);
00697 if (ret < 0)
00698 return AVERROR(EAGAIN);
00699 s->read_buf_index += ret;
00700 if (s->read_buf_index < s->read_buf_size)
00701 return 1;
00702 else
00703 return 0;
00704 }
00705 }
00706
00707 if (len < 12)
00708 return -1;
00709
00710 if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
00711 return -1;
00712 if (RTP_PT_IS_RTCP(buf[1])) {
00713 return rtcp_parse_packet(s, buf, len);
00714 }
00715
00716 if ((s->seq == 0 && !s->queue) || s->queue_size <= 1) {
00717
00718 return rtp_parse_packet_internal(s, pkt, buf, len);
00719 } else {
00720 uint16_t seq = AV_RB16(buf + 2);
00721 int16_t diff = seq - s->seq;
00722 if (diff < 0) {
00723
00724 av_log(s->st ? s->st->codec : NULL, AV_LOG_WARNING,
00725 "RTP: dropping old packet received too late\n");
00726 return -1;
00727 } else if (diff <= 1) {
00728
00729 rv = rtp_parse_packet_internal(s, pkt, buf, len);
00730 return rv;
00731 } else {
00732
00733 enqueue_packet(s, buf, len);
00734 *bufptr = NULL;
00735
00736
00737 if (s->queue_len >= s->queue_size)
00738 return rtp_parse_queued_packet(s, pkt);
00739 return -1;
00740 }
00741 }
00742 }
00743
00753 int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
00754 uint8_t **bufptr, int len)
00755 {
00756 int rv = rtp_parse_one_packet(s, pkt, bufptr, len);
00757 s->prev_ret = rv;
00758 while (rv == AVERROR(EAGAIN) && has_next_packet(s))
00759 rv = rtp_parse_queued_packet(s, pkt);
00760 return rv ? rv : has_next_packet(s);
00761 }
00762
00763 void ff_rtp_parse_close(RTPDemuxContext *s)
00764 {
00765 ff_rtp_reset_packet_queue(s);
00766 if (!strcmp(ff_rtp_enc_name(s->payload_type), "MP2T")) {
00767 ff_mpegts_parse_close(s->ts);
00768 }
00769 av_free(s);
00770 }
00771
00772 int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
00773 int (*parse_fmtp)(AVStream *stream,
00774 PayloadContext *data,
00775 char *attr, char *value))
00776 {
00777 char attr[256];
00778 char *value;
00779 int res;
00780 int value_size = strlen(p) + 1;
00781
00782 if (!(value = av_malloc(value_size))) {
00783 av_log(NULL, AV_LOG_ERROR, "Failed to allocate data for FMTP.\n");
00784 return AVERROR(ENOMEM);
00785 }
00786
00787
00788 while (*p && *p == ' ')
00789 p++;
00790 while (*p && *p != ' ')
00791 p++;
00792 while (*p && *p == ' ')
00793 p++;
00794
00795 while (ff_rtsp_next_attr_and_value(&p,
00796 attr, sizeof(attr),
00797 value, value_size)) {
00798 res = parse_fmtp(stream, data, attr, value);
00799 if (res < 0 && res != AVERROR_PATCHWELCOME) {
00800 av_free(value);
00801 return res;
00802 }
00803 }
00804 av_free(value);
00805 return 0;
00806 }
00807
00808 int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx)
00809 {
00810 av_init_packet(pkt);
00811
00812 pkt->size = avio_close_dyn_buf(*dyn_buf, &pkt->data);
00813 pkt->stream_index = stream_idx;
00814 pkt->destruct = av_destruct_packet;
00815 *dyn_buf = NULL;
00816 return pkt->size;
00817 }