Libav
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00001 /* 00002 * MPEG2 transport stream (aka DVB) muxer 00003 * Copyright (c) 2003 Fabrice Bellard 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "libavutil/bswap.h" 00023 #include "libavutil/crc.h" 00024 #include "libavcodec/mpegvideo.h" 00025 #include "avformat.h" 00026 #include "internal.h" 00027 #include "mpegts.h" 00028 #include "adts.h" 00029 00030 /* write DVB SI sections */ 00031 00032 /*********************************************/ 00033 /* mpegts section writer */ 00034 00035 typedef struct MpegTSSection { 00036 int pid; 00037 int cc; 00038 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); 00039 void *opaque; 00040 } MpegTSSection; 00041 00042 typedef struct MpegTSService { 00043 MpegTSSection pmt; /* MPEG2 pmt table context */ 00044 int sid; /* service ID */ 00045 char *name; 00046 char *provider_name; 00047 int pcr_pid; 00048 int pcr_packet_count; 00049 int pcr_packet_period; 00050 } MpegTSService; 00051 00052 typedef struct MpegTSWrite { 00053 MpegTSSection pat; /* MPEG2 pat table */ 00054 MpegTSSection sdt; /* MPEG2 sdt table context */ 00055 MpegTSService **services; 00056 int sdt_packet_count; 00057 int sdt_packet_period; 00058 int pat_packet_count; 00059 int pat_packet_period; 00060 int nb_services; 00061 int onid; 00062 int tsid; 00063 uint64_t cur_pcr; 00064 int mux_rate; 00065 } MpegTSWrite; 00066 00067 /* NOTE: 4 bytes must be left at the end for the crc32 */ 00068 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) 00069 { 00070 MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data; 00071 unsigned int crc; 00072 unsigned char packet[TS_PACKET_SIZE]; 00073 const unsigned char *buf_ptr; 00074 unsigned char *q; 00075 int first, b, len1, left; 00076 00077 crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); 00078 buf[len - 4] = (crc >> 24) & 0xff; 00079 buf[len - 3] = (crc >> 16) & 0xff; 00080 buf[len - 2] = (crc >> 8) & 0xff; 00081 buf[len - 1] = (crc) & 0xff; 00082 00083 /* send each packet */ 00084 buf_ptr = buf; 00085 while (len > 0) { 00086 first = (buf == buf_ptr); 00087 q = packet; 00088 *q++ = 0x47; 00089 b = (s->pid >> 8); 00090 if (first) 00091 b |= 0x40; 00092 *q++ = b; 00093 *q++ = s->pid; 00094 s->cc = (s->cc + 1) & 0xf; 00095 *q++ = 0x10 | s->cc; 00096 if (first) 00097 *q++ = 0; /* 0 offset */ 00098 len1 = TS_PACKET_SIZE - (q - packet); 00099 if (len1 > len) 00100 len1 = len; 00101 memcpy(q, buf_ptr, len1); 00102 q += len1; 00103 /* add known padding data */ 00104 left = TS_PACKET_SIZE - (q - packet); 00105 if (left > 0) 00106 memset(q, 0xff, left); 00107 00108 s->write_packet(s, packet); 00109 00110 buf_ptr += len1; 00111 len -= len1; 00112 00113 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 00114 } 00115 } 00116 00117 static inline void put16(uint8_t **q_ptr, int val) 00118 { 00119 uint8_t *q; 00120 q = *q_ptr; 00121 *q++ = val >> 8; 00122 *q++ = val; 00123 *q_ptr = q; 00124 } 00125 00126 static int mpegts_write_section1(MpegTSSection *s, int tid, int id, 00127 int version, int sec_num, int last_sec_num, 00128 uint8_t *buf, int len) 00129 { 00130 uint8_t section[1024], *q; 00131 unsigned int tot_len; 00132 00133 tot_len = 3 + 5 + len + 4; 00134 /* check if not too big */ 00135 if (tot_len > 1024) 00136 return -1; 00137 00138 q = section; 00139 *q++ = tid; 00140 put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ 00141 put16(&q, id); 00142 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ 00143 *q++ = sec_num; 00144 *q++ = last_sec_num; 00145 memcpy(q, buf, len); 00146 00147 mpegts_write_section(s, section, tot_len); 00148 return 0; 00149 } 00150 00151 /*********************************************/ 00152 /* mpegts writer */ 00153 00154 #define DEFAULT_PMT_START_PID 0x1000 00155 #define DEFAULT_START_PID 0x0100 00156 #define DEFAULT_PROVIDER_NAME "FFmpeg" 00157 #define DEFAULT_SERVICE_NAME "Service01" 00158 00159 /* default network id, transport stream and service identifiers */ 00160 #define DEFAULT_ONID 0x0001 00161 #define DEFAULT_TSID 0x0001 00162 #define DEFAULT_SID 0x0001 00163 00164 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ 00165 #define DEFAULT_PES_HEADER_FREQ 16 00166 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) 00167 00168 /* we retransmit the SI info at this rate */ 00169 #define SDT_RETRANS_TIME 500 00170 #define PAT_RETRANS_TIME 100 00171 #define PCR_RETRANS_TIME 20 00172 00173 typedef struct MpegTSWriteStream { 00174 struct MpegTSService *service; 00175 int pid; /* stream associated pid */ 00176 int cc; 00177 int payload_index; 00178 int first_pts_check; 00179 int64_t payload_pts; 00180 int64_t payload_dts; 00181 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; 00182 ADTSContext *adts; 00183 } MpegTSWriteStream; 00184 00185 static void mpegts_write_pat(AVFormatContext *s) 00186 { 00187 MpegTSWrite *ts = s->priv_data; 00188 MpegTSService *service; 00189 uint8_t data[1012], *q; 00190 int i; 00191 00192 q = data; 00193 for(i = 0; i < ts->nb_services; i++) { 00194 service = ts->services[i]; 00195 put16(&q, service->sid); 00196 put16(&q, 0xe000 | service->pmt.pid); 00197 } 00198 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, 00199 data, q - data); 00200 } 00201 00202 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) 00203 { 00204 // MpegTSWrite *ts = s->priv_data; 00205 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; 00206 int val, stream_type, i; 00207 00208 q = data; 00209 put16(&q, 0xe000 | service->pcr_pid); 00210 00211 program_info_length_ptr = q; 00212 q += 2; /* patched after */ 00213 00214 /* put program info here */ 00215 00216 val = 0xf000 | (q - program_info_length_ptr - 2); 00217 program_info_length_ptr[0] = val >> 8; 00218 program_info_length_ptr[1] = val; 00219 00220 for(i = 0; i < s->nb_streams; i++) { 00221 AVStream *st = s->streams[i]; 00222 MpegTSWriteStream *ts_st = st->priv_data; 00223 AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0); 00224 switch(st->codec->codec_id) { 00225 case CODEC_ID_MPEG1VIDEO: 00226 case CODEC_ID_MPEG2VIDEO: 00227 stream_type = STREAM_TYPE_VIDEO_MPEG2; 00228 break; 00229 case CODEC_ID_MPEG4: 00230 stream_type = STREAM_TYPE_VIDEO_MPEG4; 00231 break; 00232 case CODEC_ID_H264: 00233 stream_type = STREAM_TYPE_VIDEO_H264; 00234 break; 00235 case CODEC_ID_DIRAC: 00236 stream_type = STREAM_TYPE_VIDEO_DIRAC; 00237 break; 00238 case CODEC_ID_MP2: 00239 case CODEC_ID_MP3: 00240 stream_type = STREAM_TYPE_AUDIO_MPEG1; 00241 break; 00242 case CODEC_ID_AAC: 00243 stream_type = STREAM_TYPE_AUDIO_AAC; 00244 break; 00245 case CODEC_ID_AC3: 00246 stream_type = STREAM_TYPE_AUDIO_AC3; 00247 break; 00248 default: 00249 stream_type = STREAM_TYPE_PRIVATE_DATA; 00250 break; 00251 } 00252 *q++ = stream_type; 00253 put16(&q, 0xe000 | ts_st->pid); 00254 desc_length_ptr = q; 00255 q += 2; /* patched after */ 00256 00257 /* write optional descriptors here */ 00258 switch(st->codec->codec_type) { 00259 case AVMEDIA_TYPE_AUDIO: 00260 if (lang && strlen(lang->value) == 3) { 00261 *q++ = 0x0a; /* ISO 639 language descriptor */ 00262 *q++ = 4; 00263 *q++ = lang->value[0]; 00264 *q++ = lang->value[1]; 00265 *q++ = lang->value[2]; 00266 *q++ = 0; /* undefined type */ 00267 } 00268 break; 00269 case AVMEDIA_TYPE_SUBTITLE: 00270 { 00271 const char *language; 00272 language = lang && strlen(lang->value)==3 ? lang->value : "eng"; 00273 *q++ = 0x59; 00274 *q++ = 8; 00275 *q++ = language[0]; 00276 *q++ = language[1]; 00277 *q++ = language[2]; 00278 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ 00279 put16(&q, 1); /* page id */ 00280 put16(&q, 1); /* ancillary page id */ 00281 } 00282 break; 00283 case AVMEDIA_TYPE_VIDEO: 00284 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { 00285 *q++ = 0x05; /*MPEG-2 registration descriptor*/ 00286 *q++ = 4; 00287 *q++ = 'd'; 00288 *q++ = 'r'; 00289 *q++ = 'a'; 00290 *q++ = 'c'; 00291 } 00292 break; 00293 } 00294 00295 val = 0xf000 | (q - desc_length_ptr - 2); 00296 desc_length_ptr[0] = val >> 8; 00297 desc_length_ptr[1] = val; 00298 } 00299 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, 00300 data, q - data); 00301 } 00302 00303 /* NOTE: str == NULL is accepted for an empty string */ 00304 static void putstr8(uint8_t **q_ptr, const char *str) 00305 { 00306 uint8_t *q; 00307 int len; 00308 00309 q = *q_ptr; 00310 if (!str) 00311 len = 0; 00312 else 00313 len = strlen(str); 00314 *q++ = len; 00315 memcpy(q, str, len); 00316 q += len; 00317 *q_ptr = q; 00318 } 00319 00320 static void mpegts_write_sdt(AVFormatContext *s) 00321 { 00322 MpegTSWrite *ts = s->priv_data; 00323 MpegTSService *service; 00324 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; 00325 int i, running_status, free_ca_mode, val; 00326 00327 q = data; 00328 put16(&q, ts->onid); 00329 *q++ = 0xff; 00330 for(i = 0; i < ts->nb_services; i++) { 00331 service = ts->services[i]; 00332 put16(&q, service->sid); 00333 *q++ = 0xfc | 0x00; /* currently no EIT info */ 00334 desc_list_len_ptr = q; 00335 q += 2; 00336 running_status = 4; /* running */ 00337 free_ca_mode = 0; 00338 00339 /* write only one descriptor for the service name and provider */ 00340 *q++ = 0x48; 00341 desc_len_ptr = q; 00342 q++; 00343 *q++ = 0x01; /* digital television service */ 00344 putstr8(&q, service->provider_name); 00345 putstr8(&q, service->name); 00346 desc_len_ptr[0] = q - desc_len_ptr - 1; 00347 00348 /* fill descriptor length */ 00349 val = (running_status << 13) | (free_ca_mode << 12) | 00350 (q - desc_list_len_ptr - 2); 00351 desc_list_len_ptr[0] = val >> 8; 00352 desc_list_len_ptr[1] = val; 00353 } 00354 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, 00355 data, q - data); 00356 } 00357 00358 static MpegTSService *mpegts_add_service(MpegTSWrite *ts, 00359 int sid, 00360 const char *provider_name, 00361 const char *name) 00362 { 00363 MpegTSService *service; 00364 00365 service = av_mallocz(sizeof(MpegTSService)); 00366 if (!service) 00367 return NULL; 00368 service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1; 00369 service->sid = sid; 00370 service->provider_name = av_strdup(provider_name); 00371 service->name = av_strdup(name); 00372 service->pcr_pid = 0x1fff; 00373 dynarray_add(&ts->services, &ts->nb_services, service); 00374 return service; 00375 } 00376 00377 static void section_write_packet(MpegTSSection *s, const uint8_t *packet) 00378 { 00379 AVFormatContext *ctx = s->opaque; 00380 put_buffer(ctx->pb, packet, TS_PACKET_SIZE); 00381 } 00382 00383 static int mpegts_write_header(AVFormatContext *s) 00384 { 00385 MpegTSWrite *ts = s->priv_data; 00386 MpegTSWriteStream *ts_st; 00387 MpegTSService *service; 00388 AVStream *st, *pcr_st = NULL; 00389 AVMetadataTag *title; 00390 int i; 00391 const char *service_name; 00392 00393 ts->tsid = DEFAULT_TSID; 00394 ts->onid = DEFAULT_ONID; 00395 /* allocate a single DVB service */ 00396 title = av_metadata_get(s->metadata, "title", NULL, 0); 00397 service_name = title ? title->value : DEFAULT_SERVICE_NAME; 00398 service = mpegts_add_service(ts, DEFAULT_SID, 00399 DEFAULT_PROVIDER_NAME, service_name); 00400 service->pmt.write_packet = section_write_packet; 00401 service->pmt.opaque = s; 00402 service->pmt.cc = 15; 00403 00404 ts->pat.pid = PAT_PID; 00405 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write 00406 ts->pat.write_packet = section_write_packet; 00407 ts->pat.opaque = s; 00408 00409 ts->sdt.pid = SDT_PID; 00410 ts->sdt.cc = 15; 00411 ts->sdt.write_packet = section_write_packet; 00412 ts->sdt.opaque = s; 00413 00414 /* assign pids to each stream */ 00415 for(i = 0;i < s->nb_streams; i++) { 00416 st = s->streams[i]; 00417 ts_st = av_mallocz(sizeof(MpegTSWriteStream)); 00418 if (!ts_st) 00419 goto fail; 00420 st->priv_data = ts_st; 00421 ts_st->service = service; 00422 ts_st->pid = DEFAULT_START_PID + i; 00423 ts_st->payload_pts = AV_NOPTS_VALUE; 00424 ts_st->payload_dts = AV_NOPTS_VALUE; 00425 ts_st->first_pts_check = 1; 00426 ts_st->cc = 15; 00427 /* update PCR pid by using the first video stream */ 00428 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 00429 service->pcr_pid == 0x1fff) { 00430 service->pcr_pid = ts_st->pid; 00431 pcr_st = st; 00432 } 00433 if (st->codec->codec_id == CODEC_ID_AAC && 00434 st->codec->extradata_size > 0) { 00435 ts_st->adts = av_mallocz(sizeof(*ts_st->adts)); 00436 if (!ts_st->adts) 00437 return AVERROR(ENOMEM); 00438 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata, 00439 st->codec->extradata_size) < 0) 00440 return -1; 00441 } 00442 } 00443 00444 /* if no video stream, use the first stream as PCR */ 00445 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { 00446 pcr_st = s->streams[0]; 00447 ts_st = pcr_st->priv_data; 00448 service->pcr_pid = ts_st->pid; 00449 } 00450 00451 ts->mux_rate = s->mux_rate ? s->mux_rate : 1; 00452 00453 if (ts->mux_rate > 1) { 00454 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) / 00455 (TS_PACKET_SIZE * 8 * 1000); 00456 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) / 00457 (TS_PACKET_SIZE * 8 * 1000); 00458 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) / 00459 (TS_PACKET_SIZE * 8 * 1000); 00460 00461 ts->cur_pcr = av_rescale(s->max_delay, 90000, AV_TIME_BASE); 00462 } else { 00463 /* Arbitrary values, PAT/PMT could be written on key frames */ 00464 ts->sdt_packet_period = 200; 00465 ts->pat_packet_period = 40; 00466 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { 00467 if (!pcr_st->codec->frame_size) { 00468 av_log(s, AV_LOG_WARNING, "frame size not set\n"); 00469 service->pcr_packet_period = 00470 pcr_st->codec->sample_rate/(10*512); 00471 } else { 00472 service->pcr_packet_period = 00473 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size); 00474 } 00475 } else { 00476 // max delta PCR 0.1s 00477 service->pcr_packet_period = 00478 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num); 00479 } 00480 } 00481 00482 // output a PCR as soon as possible 00483 service->pcr_packet_count = service->pcr_packet_period; 00484 ts->pat_packet_count = ts->pat_packet_period-1; 00485 ts->sdt_packet_count = ts->sdt_packet_period-1; 00486 00487 av_log(s, AV_LOG_INFO, 00488 "muxrate %d bps, pcr every %d pkts, " 00489 "sdt every %d, pat/pmt every %d pkts\n", 00490 ts->mux_rate, service->pcr_packet_period, 00491 ts->sdt_packet_period, ts->pat_packet_period); 00492 00493 00494 put_flush_packet(s->pb); 00495 00496 return 0; 00497 00498 fail: 00499 for(i = 0;i < s->nb_streams; i++) { 00500 st = s->streams[i]; 00501 av_free(st->priv_data); 00502 } 00503 return -1; 00504 } 00505 00506 /* send SDT, PAT and PMT tables regulary */ 00507 static void retransmit_si_info(AVFormatContext *s) 00508 { 00509 MpegTSWrite *ts = s->priv_data; 00510 int i; 00511 00512 if (++ts->sdt_packet_count == ts->sdt_packet_period) { 00513 ts->sdt_packet_count = 0; 00514 mpegts_write_sdt(s); 00515 } 00516 if (++ts->pat_packet_count == ts->pat_packet_period) { 00517 ts->pat_packet_count = 0; 00518 mpegts_write_pat(s); 00519 for(i = 0; i < ts->nb_services; i++) { 00520 mpegts_write_pmt(s, ts->services[i]); 00521 } 00522 } 00523 } 00524 00525 /* Write a single null transport stream packet */ 00526 static void mpegts_insert_null_packet(AVFormatContext *s) 00527 { 00528 MpegTSWrite *ts = s->priv_data; 00529 uint8_t *q; 00530 uint8_t buf[TS_PACKET_SIZE]; 00531 00532 q = buf; 00533 *q++ = 0x47; 00534 *q++ = 0x00 | 0x1f; 00535 *q++ = 0xff; 00536 *q++ = 0x10; 00537 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf)); 00538 put_buffer(s->pb, buf, TS_PACKET_SIZE); 00539 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 00540 } 00541 00542 /* Write a single transport stream packet with a PCR and no payload */ 00543 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st) 00544 { 00545 MpegTSWrite *ts = s->priv_data; 00546 MpegTSWriteStream *ts_st = st->priv_data; 00547 uint8_t *q; 00548 uint64_t pcr = ts->cur_pcr; 00549 uint8_t buf[TS_PACKET_SIZE]; 00550 00551 q = buf; 00552 *q++ = 0x47; 00553 *q++ = ts_st->pid >> 8; 00554 *q++ = ts_st->pid; 00555 *q++ = 0x20 | ts_st->cc; /* Adaptation only */ 00556 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */ 00557 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */ 00558 *q++ = 0x10; /* Adaptation flags: PCR present */ 00559 00560 /* PCR coded into 6 bytes */ 00561 *q++ = pcr >> 25; 00562 *q++ = pcr >> 17; 00563 *q++ = pcr >> 9; 00564 *q++ = pcr >> 1; 00565 *q++ = (pcr & 1) << 7; 00566 *q++ = 0; 00567 00568 /* stuffing bytes */ 00569 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf)); 00570 put_buffer(s->pb, buf, TS_PACKET_SIZE); 00571 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 00572 } 00573 00574 static void write_pts(uint8_t *q, int fourbits, int64_t pts) 00575 { 00576 int val; 00577 00578 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; 00579 *q++ = val; 00580 val = (((pts >> 15) & 0x7fff) << 1) | 1; 00581 *q++ = val >> 8; 00582 *q++ = val; 00583 val = (((pts) & 0x7fff) << 1) | 1; 00584 *q++ = val >> 8; 00585 *q++ = val; 00586 } 00587 00588 /* Add a pes header to the front of payload, and segment into an integer number of 00589 * ts packets. The final ts packet is padded using an over-sized adaptation header 00590 * to exactly fill the last ts packet. 00591 * NOTE: 'payload' contains a complete PES payload. 00592 */ 00593 static void mpegts_write_pes(AVFormatContext *s, AVStream *st, 00594 const uint8_t *payload, int payload_size, 00595 int64_t pts, int64_t dts) 00596 { 00597 MpegTSWriteStream *ts_st = st->priv_data; 00598 MpegTSWrite *ts = s->priv_data; 00599 uint8_t buf[TS_PACKET_SIZE]; 00600 uint8_t *q; 00601 int val, is_start, len, header_len, write_pcr, private_code, flags; 00602 int afc_len, stuffing_len; 00603 int64_t pcr = -1; /* avoid warning */ 00604 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); 00605 00606 is_start = 1; 00607 while (payload_size > 0) { 00608 retransmit_si_info(s); 00609 00610 write_pcr = 0; 00611 if (ts_st->pid == ts_st->service->pcr_pid) { 00612 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames 00613 ts_st->service->pcr_packet_count++; 00614 if (ts_st->service->pcr_packet_count >= 00615 ts_st->service->pcr_packet_period) { 00616 ts_st->service->pcr_packet_count = 0; 00617 write_pcr = 1; 00618 } 00619 } 00620 00621 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE && 00622 (dts - (int64_t)ts->cur_pcr) > delay) { 00623 /* pcr insert gets priority over null packet insert */ 00624 if (write_pcr) 00625 mpegts_insert_pcr_only(s, st); 00626 else 00627 mpegts_insert_null_packet(s); 00628 continue; /* recalculate write_pcr and possibly retransmit si_info */ 00629 } 00630 00631 /* prepare packet header */ 00632 q = buf; 00633 *q++ = 0x47; 00634 val = (ts_st->pid >> 8); 00635 if (is_start) 00636 val |= 0x40; 00637 *q++ = val; 00638 *q++ = ts_st->pid; 00639 ts_st->cc = (ts_st->cc + 1) & 0xf; 00640 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0); 00641 if (write_pcr) { 00642 // add 11, pcr references the last byte of program clock reference base 00643 if (ts->mux_rate > 1) 00644 pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate; 00645 else 00646 pcr = dts - delay; 00647 if (dts != AV_NOPTS_VALUE && dts < pcr) 00648 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); 00649 *q++ = 7; /* AFC length */ 00650 *q++ = 0x10; /* flags: PCR present */ 00651 *q++ = pcr >> 25; 00652 *q++ = pcr >> 17; 00653 *q++ = pcr >> 9; 00654 *q++ = pcr >> 1; 00655 *q++ = (pcr & 1) << 7; 00656 *q++ = 0; 00657 } 00658 if (is_start) { 00659 int pes_extension = 0; 00660 /* write PES header */ 00661 *q++ = 0x00; 00662 *q++ = 0x00; 00663 *q++ = 0x01; 00664 private_code = 0; 00665 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 00666 if (st->codec->codec_id == CODEC_ID_DIRAC) { 00667 *q++ = 0xfd; 00668 } else 00669 *q++ = 0xe0; 00670 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && 00671 (st->codec->codec_id == CODEC_ID_MP2 || 00672 st->codec->codec_id == CODEC_ID_MP3)) { 00673 *q++ = 0xc0; 00674 } else { 00675 *q++ = 0xbd; 00676 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) { 00677 private_code = 0x20; 00678 } 00679 } 00680 header_len = 0; 00681 flags = 0; 00682 if (pts != AV_NOPTS_VALUE) { 00683 header_len += 5; 00684 flags |= 0x80; 00685 } 00686 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { 00687 header_len += 5; 00688 flags |= 0x40; 00689 } 00690 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 00691 st->codec->codec_id == CODEC_ID_DIRAC) { 00692 /* set PES_extension_flag */ 00693 pes_extension = 1; 00694 flags |= 0x01; 00695 00696 /* 00697 * One byte for PES2 extension flag + 00698 * one byte for extension length + 00699 * one byte for extension id 00700 */ 00701 header_len += 3; 00702 } 00703 len = payload_size + header_len + 3; 00704 if (private_code != 0) 00705 len++; 00706 if (len > 0xffff) 00707 len = 0; 00708 *q++ = len >> 8; 00709 *q++ = len; 00710 val = 0x80; 00711 /* data alignment indicator is required for subtitle data */ 00712 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) 00713 val |= 0x04; 00714 *q++ = val; 00715 *q++ = flags; 00716 *q++ = header_len; 00717 if (pts != AV_NOPTS_VALUE) { 00718 write_pts(q, flags >> 6, pts); 00719 q += 5; 00720 } 00721 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { 00722 write_pts(q, 1, dts); 00723 q += 5; 00724 } 00725 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) { 00726 flags = 0x01; /* set PES_extension_flag_2 */ 00727 *q++ = flags; 00728 *q++ = 0x80 | 0x01; /* marker bit + extension length */ 00729 /* 00730 * Set the stream id extension flag bit to 0 and 00731 * write the extended stream id 00732 */ 00733 *q++ = 0x00 | 0x60; 00734 } 00735 if (private_code != 0) 00736 *q++ = private_code; 00737 is_start = 0; 00738 } 00739 /* header size */ 00740 header_len = q - buf; 00741 /* data len */ 00742 len = TS_PACKET_SIZE - header_len; 00743 if (len > payload_size) 00744 len = payload_size; 00745 stuffing_len = TS_PACKET_SIZE - header_len - len; 00746 if (stuffing_len > 0) { 00747 /* add stuffing with AFC */ 00748 if (buf[3] & 0x20) { 00749 /* stuffing already present: increase its size */ 00750 afc_len = buf[4] + 1; 00751 memmove(buf + 4 + afc_len + stuffing_len, 00752 buf + 4 + afc_len, 00753 header_len - (4 + afc_len)); 00754 buf[4] += stuffing_len; 00755 memset(buf + 4 + afc_len, 0xff, stuffing_len); 00756 } else { 00757 /* add stuffing */ 00758 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); 00759 buf[3] |= 0x20; 00760 buf[4] = stuffing_len - 1; 00761 if (stuffing_len >= 2) { 00762 buf[5] = 0x00; 00763 memset(buf + 6, 0xff, stuffing_len - 2); 00764 } 00765 } 00766 } 00767 memcpy(buf + TS_PACKET_SIZE - len, payload, len); 00768 payload += len; 00769 payload_size -= len; 00770 put_buffer(s->pb, buf, TS_PACKET_SIZE); 00771 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 00772 } 00773 put_flush_packet(s->pb); 00774 } 00775 00776 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) 00777 { 00778 AVStream *st = s->streams[pkt->stream_index]; 00779 int size = pkt->size; 00780 uint8_t *buf= pkt->data; 00781 uint8_t *data= NULL; 00782 MpegTSWriteStream *ts_st = st->priv_data; 00783 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2; 00784 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; 00785 00786 if (pkt->pts != AV_NOPTS_VALUE) 00787 pts = pkt->pts + delay; 00788 if (pkt->dts != AV_NOPTS_VALUE) 00789 dts = pkt->dts + delay; 00790 00791 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) { 00792 av_log(s, AV_LOG_ERROR, "first pts value must set\n"); 00793 return -1; 00794 } 00795 ts_st->first_pts_check = 0; 00796 00797 if (st->codec->codec_id == CODEC_ID_H264) { 00798 const uint8_t *p = buf, *buf_end = p+size; 00799 uint32_t state = -1; 00800 00801 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { 00802 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, " 00803 "no startcode found, use -vbsf h264_mp4toannexb\n"); 00804 return -1; 00805 } 00806 00807 do { 00808 p = ff_find_start_code(p, buf_end, &state); 00809 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f); 00810 } while (p < buf_end && (state & 0x1f) != 9 && 00811 (state & 0x1f) != 5 && (state & 0x1f) != 1); 00812 00813 if ((state & 0x1f) != 9) { // AUD NAL 00814 data = av_malloc(pkt->size+6); 00815 if (!data) 00816 return -1; 00817 memcpy(data+6, pkt->data, pkt->size); 00818 AV_WB32(data, 0x00000001); 00819 data[4] = 0x09; 00820 data[5] = 0xe0; // any slice type 00821 buf = data; 00822 size = pkt->size+6; 00823 } 00824 } else if (st->codec->codec_id == CODEC_ID_AAC) { 00825 if (pkt->size < 2) 00826 return -1; 00827 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) { 00828 ADTSContext *adts = ts_st->adts; 00829 int new_size; 00830 if (!adts) { 00831 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format " 00832 "and extradata missing\n"); 00833 return -1; 00834 } 00835 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size; 00836 if ((unsigned)new_size >= INT_MAX) 00837 return -1; 00838 data = av_malloc(new_size); 00839 if (!data) 00840 return AVERROR(ENOMEM); 00841 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size); 00842 if (adts->pce_size) { 00843 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size); 00844 adts->pce_size = 0; 00845 } 00846 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size); 00847 buf = data; 00848 size = new_size; 00849 } 00850 } 00851 00852 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) { 00853 // for video and subtitle, write a single pes packet 00854 mpegts_write_pes(s, st, buf, size, pts, dts); 00855 av_free(data); 00856 return 0; 00857 } 00858 00859 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) { 00860 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 00861 ts_st->payload_pts, ts_st->payload_dts); 00862 ts_st->payload_index = 0; 00863 } 00864 00865 if (!ts_st->payload_index) { 00866 ts_st->payload_pts = pts; 00867 ts_st->payload_dts = dts; 00868 } 00869 00870 memcpy(ts_st->payload + ts_st->payload_index, buf, size); 00871 ts_st->payload_index += size; 00872 00873 av_free(data); 00874 00875 return 0; 00876 } 00877 00878 static int mpegts_write_end(AVFormatContext *s) 00879 { 00880 MpegTSWrite *ts = s->priv_data; 00881 MpegTSWriteStream *ts_st; 00882 MpegTSService *service; 00883 AVStream *st; 00884 int i; 00885 00886 /* flush current packets */ 00887 for(i = 0; i < s->nb_streams; i++) { 00888 st = s->streams[i]; 00889 ts_st = st->priv_data; 00890 if (ts_st->payload_index > 0) { 00891 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 00892 ts_st->payload_pts, ts_st->payload_dts); 00893 } 00894 av_freep(&ts_st->adts); 00895 } 00896 put_flush_packet(s->pb); 00897 00898 for(i = 0; i < ts->nb_services; i++) { 00899 service = ts->services[i]; 00900 av_freep(&service->provider_name); 00901 av_freep(&service->name); 00902 av_free(service); 00903 } 00904 av_free(ts->services); 00905 00906 return 0; 00907 } 00908 00909 AVOutputFormat mpegts_muxer = { 00910 "mpegts", 00911 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), 00912 "video/x-mpegts", 00913 "ts,m2t", 00914 sizeof(MpegTSWrite), 00915 CODEC_ID_MP2, 00916 CODEC_ID_MPEG2VIDEO, 00917 mpegts_write_header, 00918 mpegts_write_packet, 00919 mpegts_write_end, 00920 };