Libav 0.7.1
|
00001 /* 00002 * MPEG2 transport stream (aka DVB) muxer 00003 * Copyright (c) 2003 Fabrice Bellard 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 "libavutil/dict.h" 00025 #include "libavutil/opt.h" 00026 #include "libavcodec/mpegvideo.h" 00027 #include "avformat.h" 00028 #include "internal.h" 00029 #include "mpegts.h" 00030 #include "adts.h" 00031 00032 #define PCR_TIME_BASE 27000000 00033 00034 /* write DVB SI sections */ 00035 00036 /*********************************************/ 00037 /* mpegts section writer */ 00038 00039 typedef struct MpegTSSection { 00040 int pid; 00041 int cc; 00042 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); 00043 void *opaque; 00044 } MpegTSSection; 00045 00046 typedef struct MpegTSService { 00047 MpegTSSection pmt; /* MPEG2 pmt table context */ 00048 int sid; /* service ID */ 00049 char *name; 00050 char *provider_name; 00051 int pcr_pid; 00052 int pcr_packet_count; 00053 int pcr_packet_period; 00054 } MpegTSService; 00055 00056 typedef struct MpegTSWrite { 00057 const AVClass *av_class; 00058 MpegTSSection pat; /* MPEG2 pat table */ 00059 MpegTSSection sdt; /* MPEG2 sdt table context */ 00060 MpegTSService **services; 00061 int sdt_packet_count; 00062 int sdt_packet_period; 00063 int pat_packet_count; 00064 int pat_packet_period; 00065 int nb_services; 00066 int onid; 00067 int tsid; 00068 int64_t first_pcr; 00069 int mux_rate; 00070 00071 int transport_stream_id; 00072 int original_network_id; 00073 int service_id; 00074 00075 int pmt_start_pid; 00076 int start_pid; 00077 } MpegTSWrite; 00078 00079 static const AVOption options[] = { 00080 { "mpegts_transport_stream_id", "Set transport_stream_id field.", 00081 offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, 00082 { "mpegts_original_network_id", "Set original_network_id field.", 00083 offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, 00084 { "mpegts_service_id", "Set service_id field.", 00085 offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, 00086 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.", 00087 offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM}, 00088 { "mpegts_start_pid", "Set the first pid.", 00089 offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM}, 00090 { NULL }, 00091 }; 00092 00093 static const AVClass mpegts_muxer_class = { 00094 .class_name = "MPEGTS muxer", 00095 .item_name = av_default_item_name, 00096 .option = options, 00097 .version = LIBAVUTIL_VERSION_INT, 00098 }; 00099 00100 /* NOTE: 4 bytes must be left at the end for the crc32 */ 00101 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) 00102 { 00103 unsigned int crc; 00104 unsigned char packet[TS_PACKET_SIZE]; 00105 const unsigned char *buf_ptr; 00106 unsigned char *q; 00107 int first, b, len1, left; 00108 00109 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); 00110 buf[len - 4] = (crc >> 24) & 0xff; 00111 buf[len - 3] = (crc >> 16) & 0xff; 00112 buf[len - 2] = (crc >> 8) & 0xff; 00113 buf[len - 1] = (crc) & 0xff; 00114 00115 /* send each packet */ 00116 buf_ptr = buf; 00117 while (len > 0) { 00118 first = (buf == buf_ptr); 00119 q = packet; 00120 *q++ = 0x47; 00121 b = (s->pid >> 8); 00122 if (first) 00123 b |= 0x40; 00124 *q++ = b; 00125 *q++ = s->pid; 00126 s->cc = (s->cc + 1) & 0xf; 00127 *q++ = 0x10 | s->cc; 00128 if (first) 00129 *q++ = 0; /* 0 offset */ 00130 len1 = TS_PACKET_SIZE - (q - packet); 00131 if (len1 > len) 00132 len1 = len; 00133 memcpy(q, buf_ptr, len1); 00134 q += len1; 00135 /* add known padding data */ 00136 left = TS_PACKET_SIZE - (q - packet); 00137 if (left > 0) 00138 memset(q, 0xff, left); 00139 00140 s->write_packet(s, packet); 00141 00142 buf_ptr += len1; 00143 len -= len1; 00144 } 00145 } 00146 00147 static inline void put16(uint8_t **q_ptr, int val) 00148 { 00149 uint8_t *q; 00150 q = *q_ptr; 00151 *q++ = val >> 8; 00152 *q++ = val; 00153 *q_ptr = q; 00154 } 00155 00156 static int mpegts_write_section1(MpegTSSection *s, int tid, int id, 00157 int version, int sec_num, int last_sec_num, 00158 uint8_t *buf, int len) 00159 { 00160 uint8_t section[1024], *q; 00161 unsigned int tot_len; 00162 /* reserved_future_use field must be set to 1 for SDT */ 00163 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000; 00164 00165 tot_len = 3 + 5 + len + 4; 00166 /* check if not too big */ 00167 if (tot_len > 1024) 00168 return -1; 00169 00170 q = section; 00171 *q++ = tid; 00172 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ 00173 put16(&q, id); 00174 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ 00175 *q++ = sec_num; 00176 *q++ = last_sec_num; 00177 memcpy(q, buf, len); 00178 00179 mpegts_write_section(s, section, tot_len); 00180 return 0; 00181 } 00182 00183 /*********************************************/ 00184 /* mpegts writer */ 00185 00186 #define DEFAULT_PROVIDER_NAME "Libav" 00187 #define DEFAULT_SERVICE_NAME "Service01" 00188 00189 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ 00190 #define DEFAULT_PES_HEADER_FREQ 16 00191 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) 00192 00193 /* we retransmit the SI info at this rate */ 00194 #define SDT_RETRANS_TIME 500 00195 #define PAT_RETRANS_TIME 100 00196 #define PCR_RETRANS_TIME 20 00197 00198 typedef struct MpegTSWriteStream { 00199 struct MpegTSService *service; 00200 int pid; /* stream associated pid */ 00201 int cc; 00202 int payload_index; 00203 int first_pts_check; 00204 int64_t payload_pts; 00205 int64_t payload_dts; 00206 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; 00207 ADTSContext *adts; 00208 } MpegTSWriteStream; 00209 00210 static void mpegts_write_pat(AVFormatContext *s) 00211 { 00212 MpegTSWrite *ts = s->priv_data; 00213 MpegTSService *service; 00214 uint8_t data[1012], *q; 00215 int i; 00216 00217 q = data; 00218 for(i = 0; i < ts->nb_services; i++) { 00219 service = ts->services[i]; 00220 put16(&q, service->sid); 00221 put16(&q, 0xe000 | service->pmt.pid); 00222 } 00223 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, 00224 data, q - data); 00225 } 00226 00227 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) 00228 { 00229 // MpegTSWrite *ts = s->priv_data; 00230 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; 00231 int val, stream_type, i; 00232 00233 q = data; 00234 put16(&q, 0xe000 | service->pcr_pid); 00235 00236 program_info_length_ptr = q; 00237 q += 2; /* patched after */ 00238 00239 /* put program info here */ 00240 00241 val = 0xf000 | (q - program_info_length_ptr - 2); 00242 program_info_length_ptr[0] = val >> 8; 00243 program_info_length_ptr[1] = val; 00244 00245 for(i = 0; i < s->nb_streams; i++) { 00246 AVStream *st = s->streams[i]; 00247 MpegTSWriteStream *ts_st = st->priv_data; 00248 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0); 00249 switch(st->codec->codec_id) { 00250 case CODEC_ID_MPEG1VIDEO: 00251 case CODEC_ID_MPEG2VIDEO: 00252 stream_type = STREAM_TYPE_VIDEO_MPEG2; 00253 break; 00254 case CODEC_ID_MPEG4: 00255 stream_type = STREAM_TYPE_VIDEO_MPEG4; 00256 break; 00257 case CODEC_ID_H264: 00258 stream_type = STREAM_TYPE_VIDEO_H264; 00259 break; 00260 case CODEC_ID_DIRAC: 00261 stream_type = STREAM_TYPE_VIDEO_DIRAC; 00262 break; 00263 case CODEC_ID_MP2: 00264 case CODEC_ID_MP3: 00265 stream_type = STREAM_TYPE_AUDIO_MPEG1; 00266 break; 00267 case CODEC_ID_AAC: 00268 stream_type = STREAM_TYPE_AUDIO_AAC; 00269 break; 00270 case CODEC_ID_AAC_LATM: 00271 stream_type = STREAM_TYPE_AUDIO_AAC_LATM; 00272 break; 00273 case CODEC_ID_AC3: 00274 stream_type = STREAM_TYPE_AUDIO_AC3; 00275 break; 00276 default: 00277 stream_type = STREAM_TYPE_PRIVATE_DATA; 00278 break; 00279 } 00280 *q++ = stream_type; 00281 put16(&q, 0xe000 | ts_st->pid); 00282 desc_length_ptr = q; 00283 q += 2; /* patched after */ 00284 00285 /* write optional descriptors here */ 00286 switch(st->codec->codec_type) { 00287 case AVMEDIA_TYPE_AUDIO: 00288 if (lang) { 00289 char *p; 00290 char *next = lang->value; 00291 uint8_t *len_ptr; 00292 00293 *q++ = 0x0a; /* ISO 639 language descriptor */ 00294 len_ptr = q++; 00295 *len_ptr = 0; 00296 00297 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) { 00298 next = strchr(p, ','); 00299 if (strlen(p) != 3 && (!next || next != p + 3)) 00300 continue; /* not a 3-letter code */ 00301 00302 *q++ = *p++; 00303 *q++ = *p++; 00304 *q++ = *p++; 00305 00306 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS) 00307 *q++ = 0x01; 00308 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED) 00309 *q++ = 0x02; 00310 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED) 00311 *q++ = 0x03; 00312 else 00313 *q++ = 0; /* undefined type */ 00314 00315 *len_ptr += 4; 00316 } 00317 00318 if (*len_ptr == 0) 00319 q -= 2; /* no language codes were written */ 00320 } 00321 break; 00322 case AVMEDIA_TYPE_SUBTITLE: 00323 { 00324 const char *language; 00325 language = lang && strlen(lang->value)==3 ? lang->value : "eng"; 00326 *q++ = 0x59; 00327 *q++ = 8; 00328 *q++ = language[0]; 00329 *q++ = language[1]; 00330 *q++ = language[2]; 00331 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ 00332 if(st->codec->extradata_size == 4) { 00333 memcpy(q, st->codec->extradata, 4); 00334 q += 4; 00335 } else { 00336 put16(&q, 1); /* page id */ 00337 put16(&q, 1); /* ancillary page id */ 00338 } 00339 } 00340 break; 00341 case AVMEDIA_TYPE_VIDEO: 00342 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { 00343 *q++ = 0x05; /*MPEG-2 registration descriptor*/ 00344 *q++ = 4; 00345 *q++ = 'd'; 00346 *q++ = 'r'; 00347 *q++ = 'a'; 00348 *q++ = 'c'; 00349 } 00350 break; 00351 } 00352 00353 val = 0xf000 | (q - desc_length_ptr - 2); 00354 desc_length_ptr[0] = val >> 8; 00355 desc_length_ptr[1] = val; 00356 } 00357 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, 00358 data, q - data); 00359 } 00360 00361 /* NOTE: str == NULL is accepted for an empty string */ 00362 static void putstr8(uint8_t **q_ptr, const char *str) 00363 { 00364 uint8_t *q; 00365 int len; 00366 00367 q = *q_ptr; 00368 if (!str) 00369 len = 0; 00370 else 00371 len = strlen(str); 00372 *q++ = len; 00373 memcpy(q, str, len); 00374 q += len; 00375 *q_ptr = q; 00376 } 00377 00378 static void mpegts_write_sdt(AVFormatContext *s) 00379 { 00380 MpegTSWrite *ts = s->priv_data; 00381 MpegTSService *service; 00382 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; 00383 int i, running_status, free_ca_mode, val; 00384 00385 q = data; 00386 put16(&q, ts->onid); 00387 *q++ = 0xff; 00388 for(i = 0; i < ts->nb_services; i++) { 00389 service = ts->services[i]; 00390 put16(&q, service->sid); 00391 *q++ = 0xfc | 0x00; /* currently no EIT info */ 00392 desc_list_len_ptr = q; 00393 q += 2; 00394 running_status = 4; /* running */ 00395 free_ca_mode = 0; 00396 00397 /* write only one descriptor for the service name and provider */ 00398 *q++ = 0x48; 00399 desc_len_ptr = q; 00400 q++; 00401 *q++ = 0x01; /* digital television service */ 00402 putstr8(&q, service->provider_name); 00403 putstr8(&q, service->name); 00404 desc_len_ptr[0] = q - desc_len_ptr - 1; 00405 00406 /* fill descriptor length */ 00407 val = (running_status << 13) | (free_ca_mode << 12) | 00408 (q - desc_list_len_ptr - 2); 00409 desc_list_len_ptr[0] = val >> 8; 00410 desc_list_len_ptr[1] = val; 00411 } 00412 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, 00413 data, q - data); 00414 } 00415 00416 static MpegTSService *mpegts_add_service(MpegTSWrite *ts, 00417 int sid, 00418 const char *provider_name, 00419 const char *name) 00420 { 00421 MpegTSService *service; 00422 00423 service = av_mallocz(sizeof(MpegTSService)); 00424 if (!service) 00425 return NULL; 00426 service->pmt.pid = ts->pmt_start_pid + ts->nb_services; 00427 service->sid = sid; 00428 service->provider_name = av_strdup(provider_name); 00429 service->name = av_strdup(name); 00430 service->pcr_pid = 0x1fff; 00431 dynarray_add(&ts->services, &ts->nb_services, service); 00432 return service; 00433 } 00434 00435 static void section_write_packet(MpegTSSection *s, const uint8_t *packet) 00436 { 00437 AVFormatContext *ctx = s->opaque; 00438 avio_write(ctx->pb, packet, TS_PACKET_SIZE); 00439 } 00440 00441 static int mpegts_write_header(AVFormatContext *s) 00442 { 00443 MpegTSWrite *ts = s->priv_data; 00444 MpegTSWriteStream *ts_st; 00445 MpegTSService *service; 00446 AVStream *st, *pcr_st = NULL; 00447 AVDictionaryEntry *title, *provider; 00448 int i, j; 00449 const char *service_name; 00450 const char *provider_name; 00451 int *pids; 00452 00453 ts->tsid = ts->transport_stream_id; 00454 ts->onid = ts->original_network_id; 00455 /* allocate a single DVB service */ 00456 title = av_dict_get(s->metadata, "service_name", NULL, 0); 00457 if (!title) 00458 title = av_dict_get(s->metadata, "title", NULL, 0); 00459 service_name = title ? title->value : DEFAULT_SERVICE_NAME; 00460 provider = av_dict_get(s->metadata, "service_provider", NULL, 0); 00461 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME; 00462 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name); 00463 service->pmt.write_packet = section_write_packet; 00464 service->pmt.opaque = s; 00465 service->pmt.cc = 15; 00466 00467 ts->pat.pid = PAT_PID; 00468 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write 00469 ts->pat.write_packet = section_write_packet; 00470 ts->pat.opaque = s; 00471 00472 ts->sdt.pid = SDT_PID; 00473 ts->sdt.cc = 15; 00474 ts->sdt.write_packet = section_write_packet; 00475 ts->sdt.opaque = s; 00476 00477 pids = av_malloc(s->nb_streams * sizeof(*pids)); 00478 if (!pids) 00479 return AVERROR(ENOMEM); 00480 00481 /* assign pids to each stream */ 00482 for(i = 0;i < s->nb_streams; i++) { 00483 st = s->streams[i]; 00484 av_set_pts_info(st, 33, 1, 90000); 00485 ts_st = av_mallocz(sizeof(MpegTSWriteStream)); 00486 if (!ts_st) 00487 goto fail; 00488 st->priv_data = ts_st; 00489 ts_st->service = service; 00490 /* MPEG pid values < 16 are reserved. Applications which set st->id in 00491 * this range are assigned a calculated pid. */ 00492 if (st->id < 16) { 00493 ts_st->pid = ts->start_pid + i; 00494 } else if (st->id < 0x1FFF) { 00495 ts_st->pid = st->id; 00496 } else { 00497 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id); 00498 goto fail; 00499 } 00500 if (ts_st->pid == service->pmt.pid) { 00501 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid); 00502 goto fail; 00503 } 00504 for (j = 0; j < i; j++) 00505 if (pids[j] == ts_st->pid) { 00506 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid); 00507 goto fail; 00508 } 00509 pids[i] = ts_st->pid; 00510 ts_st->payload_pts = AV_NOPTS_VALUE; 00511 ts_st->payload_dts = AV_NOPTS_VALUE; 00512 ts_st->first_pts_check = 1; 00513 ts_st->cc = 15; 00514 /* update PCR pid by using the first video stream */ 00515 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 00516 service->pcr_pid == 0x1fff) { 00517 service->pcr_pid = ts_st->pid; 00518 pcr_st = st; 00519 } 00520 if (st->codec->codec_id == CODEC_ID_AAC && 00521 st->codec->extradata_size > 0) { 00522 ts_st->adts = av_mallocz(sizeof(*ts_st->adts)); 00523 if (!ts_st->adts) 00524 return AVERROR(ENOMEM); 00525 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata, 00526 st->codec->extradata_size) < 0) 00527 return -1; 00528 } 00529 } 00530 00531 av_free(pids); 00532 00533 /* if no video stream, use the first stream as PCR */ 00534 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { 00535 pcr_st = s->streams[0]; 00536 ts_st = pcr_st->priv_data; 00537 service->pcr_pid = ts_st->pid; 00538 } 00539 00540 ts->mux_rate = s->mux_rate ? s->mux_rate : 1; 00541 00542 if (ts->mux_rate > 1) { 00543 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) / 00544 (TS_PACKET_SIZE * 8 * 1000); 00545 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) / 00546 (TS_PACKET_SIZE * 8 * 1000); 00547 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) / 00548 (TS_PACKET_SIZE * 8 * 1000); 00549 00550 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE); 00551 } else { 00552 /* Arbitrary values, PAT/PMT could be written on key frames */ 00553 ts->sdt_packet_period = 200; 00554 ts->pat_packet_period = 40; 00555 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { 00556 if (!pcr_st->codec->frame_size) { 00557 av_log(s, AV_LOG_WARNING, "frame size not set\n"); 00558 service->pcr_packet_period = 00559 pcr_st->codec->sample_rate/(10*512); 00560 } else { 00561 service->pcr_packet_period = 00562 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size); 00563 } 00564 } else { 00565 // max delta PCR 0.1s 00566 service->pcr_packet_period = 00567 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num); 00568 } 00569 } 00570 00571 // output a PCR as soon as possible 00572 service->pcr_packet_count = service->pcr_packet_period; 00573 ts->pat_packet_count = ts->pat_packet_period-1; 00574 ts->sdt_packet_count = ts->sdt_packet_period-1; 00575 00576 if (ts->mux_rate == 1) 00577 av_log(s, AV_LOG_INFO, "muxrate VBR, "); 00578 else 00579 av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate); 00580 av_log(s, AV_LOG_INFO, "pcr every %d pkts, " 00581 "sdt every %d, pat/pmt every %d pkts\n", 00582 service->pcr_packet_period, 00583 ts->sdt_packet_period, ts->pat_packet_period); 00584 00585 avio_flush(s->pb); 00586 00587 return 0; 00588 00589 fail: 00590 av_free(pids); 00591 for(i = 0;i < s->nb_streams; i++) { 00592 st = s->streams[i]; 00593 av_freep(&st->priv_data); 00594 } 00595 return -1; 00596 } 00597 00598 /* send SDT, PAT and PMT tables regulary */ 00599 static void retransmit_si_info(AVFormatContext *s) 00600 { 00601 MpegTSWrite *ts = s->priv_data; 00602 int i; 00603 00604 if (++ts->sdt_packet_count == ts->sdt_packet_period) { 00605 ts->sdt_packet_count = 0; 00606 mpegts_write_sdt(s); 00607 } 00608 if (++ts->pat_packet_count == ts->pat_packet_period) { 00609 ts->pat_packet_count = 0; 00610 mpegts_write_pat(s); 00611 for(i = 0; i < ts->nb_services; i++) { 00612 mpegts_write_pmt(s, ts->services[i]); 00613 } 00614 } 00615 } 00616 00617 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb) 00618 { 00619 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) + 00620 ts->first_pcr; 00621 } 00622 00623 static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr) 00624 { 00625 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300; 00626 00627 *buf++ = pcr_high >> 25; 00628 *buf++ = pcr_high >> 17; 00629 *buf++ = pcr_high >> 9; 00630 *buf++ = pcr_high >> 1; 00631 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e; 00632 *buf++ = pcr_low; 00633 00634 return buf; 00635 } 00636 00637 /* Write a single null transport stream packet */ 00638 static void mpegts_insert_null_packet(AVFormatContext *s) 00639 { 00640 uint8_t *q; 00641 uint8_t buf[TS_PACKET_SIZE]; 00642 00643 q = buf; 00644 *q++ = 0x47; 00645 *q++ = 0x00 | 0x1f; 00646 *q++ = 0xff; 00647 *q++ = 0x10; 00648 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf)); 00649 avio_write(s->pb, buf, TS_PACKET_SIZE); 00650 } 00651 00652 /* Write a single transport stream packet with a PCR and no payload */ 00653 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st) 00654 { 00655 MpegTSWrite *ts = s->priv_data; 00656 MpegTSWriteStream *ts_st = st->priv_data; 00657 uint8_t *q; 00658 uint8_t buf[TS_PACKET_SIZE]; 00659 00660 q = buf; 00661 *q++ = 0x47; 00662 *q++ = ts_st->pid >> 8; 00663 *q++ = ts_st->pid; 00664 *q++ = 0x20 | ts_st->cc; /* Adaptation only */ 00665 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */ 00666 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */ 00667 *q++ = 0x10; /* Adaptation flags: PCR present */ 00668 00669 /* PCR coded into 6 bytes */ 00670 q = write_pcr_bits(q, get_pcr(ts, s->pb)); 00671 00672 /* stuffing bytes */ 00673 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf)); 00674 avio_write(s->pb, buf, TS_PACKET_SIZE); 00675 } 00676 00677 static void write_pts(uint8_t *q, int fourbits, int64_t pts) 00678 { 00679 int val; 00680 00681 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; 00682 *q++ = val; 00683 val = (((pts >> 15) & 0x7fff) << 1) | 1; 00684 *q++ = val >> 8; 00685 *q++ = val; 00686 val = (((pts) & 0x7fff) << 1) | 1; 00687 *q++ = val >> 8; 00688 *q++ = val; 00689 } 00690 00691 /* Add a pes header to the front of payload, and segment into an integer number of 00692 * ts packets. The final ts packet is padded using an over-sized adaptation header 00693 * to exactly fill the last ts packet. 00694 * NOTE: 'payload' contains a complete PES payload. 00695 */ 00696 static void mpegts_write_pes(AVFormatContext *s, AVStream *st, 00697 const uint8_t *payload, int payload_size, 00698 int64_t pts, int64_t dts) 00699 { 00700 MpegTSWriteStream *ts_st = st->priv_data; 00701 MpegTSWrite *ts = s->priv_data; 00702 uint8_t buf[TS_PACKET_SIZE]; 00703 uint8_t *q; 00704 int val, is_start, len, header_len, write_pcr, private_code, flags; 00705 int afc_len, stuffing_len; 00706 int64_t pcr = -1; /* avoid warning */ 00707 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); 00708 00709 is_start = 1; 00710 while (payload_size > 0) { 00711 retransmit_si_info(s); 00712 00713 write_pcr = 0; 00714 if (ts_st->pid == ts_st->service->pcr_pid) { 00715 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames 00716 ts_st->service->pcr_packet_count++; 00717 if (ts_st->service->pcr_packet_count >= 00718 ts_st->service->pcr_packet_period) { 00719 ts_st->service->pcr_packet_count = 0; 00720 write_pcr = 1; 00721 } 00722 } 00723 00724 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE && 00725 (dts - get_pcr(ts, s->pb)/300) > delay) { 00726 /* pcr insert gets priority over null packet insert */ 00727 if (write_pcr) 00728 mpegts_insert_pcr_only(s, st); 00729 else 00730 mpegts_insert_null_packet(s); 00731 continue; /* recalculate write_pcr and possibly retransmit si_info */ 00732 } 00733 00734 /* prepare packet header */ 00735 q = buf; 00736 *q++ = 0x47; 00737 val = (ts_st->pid >> 8); 00738 if (is_start) 00739 val |= 0x40; 00740 *q++ = val; 00741 *q++ = ts_st->pid; 00742 ts_st->cc = (ts_st->cc + 1) & 0xf; 00743 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0); 00744 if (write_pcr) { 00745 // add 11, pcr references the last byte of program clock reference base 00746 if (ts->mux_rate > 1) 00747 pcr = get_pcr(ts, s->pb); 00748 else 00749 pcr = (dts - delay)*300; 00750 if (dts != AV_NOPTS_VALUE && dts < pcr / 300) 00751 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); 00752 *q++ = 7; /* AFC length */ 00753 *q++ = 0x10; /* flags: PCR present */ 00754 q = write_pcr_bits(q, pcr); 00755 } 00756 if (is_start) { 00757 int pes_extension = 0; 00758 /* write PES header */ 00759 *q++ = 0x00; 00760 *q++ = 0x00; 00761 *q++ = 0x01; 00762 private_code = 0; 00763 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 00764 if (st->codec->codec_id == CODEC_ID_DIRAC) { 00765 *q++ = 0xfd; 00766 } else 00767 *q++ = 0xe0; 00768 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && 00769 (st->codec->codec_id == CODEC_ID_MP2 || 00770 st->codec->codec_id == CODEC_ID_MP3 || 00771 st->codec->codec_id == CODEC_ID_AAC)) { 00772 *q++ = 0xc0; 00773 } else { 00774 *q++ = 0xbd; 00775 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) { 00776 private_code = 0x20; 00777 } 00778 } 00779 header_len = 0; 00780 flags = 0; 00781 if (pts != AV_NOPTS_VALUE) { 00782 header_len += 5; 00783 flags |= 0x80; 00784 } 00785 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { 00786 header_len += 5; 00787 flags |= 0x40; 00788 } 00789 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 00790 st->codec->codec_id == CODEC_ID_DIRAC) { 00791 /* set PES_extension_flag */ 00792 pes_extension = 1; 00793 flags |= 0x01; 00794 00795 /* 00796 * One byte for PES2 extension flag + 00797 * one byte for extension length + 00798 * one byte for extension id 00799 */ 00800 header_len += 3; 00801 } 00802 len = payload_size + header_len + 3; 00803 if (private_code != 0) 00804 len++; 00805 if (len > 0xffff) 00806 len = 0; 00807 *q++ = len >> 8; 00808 *q++ = len; 00809 val = 0x80; 00810 /* data alignment indicator is required for subtitle data */ 00811 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) 00812 val |= 0x04; 00813 *q++ = val; 00814 *q++ = flags; 00815 *q++ = header_len; 00816 if (pts != AV_NOPTS_VALUE) { 00817 write_pts(q, flags >> 6, pts); 00818 q += 5; 00819 } 00820 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { 00821 write_pts(q, 1, dts); 00822 q += 5; 00823 } 00824 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) { 00825 flags = 0x01; /* set PES_extension_flag_2 */ 00826 *q++ = flags; 00827 *q++ = 0x80 | 0x01; /* marker bit + extension length */ 00828 /* 00829 * Set the stream id extension flag bit to 0 and 00830 * write the extended stream id 00831 */ 00832 *q++ = 0x00 | 0x60; 00833 } 00834 if (private_code != 0) 00835 *q++ = private_code; 00836 is_start = 0; 00837 } 00838 /* header size */ 00839 header_len = q - buf; 00840 /* data len */ 00841 len = TS_PACKET_SIZE - header_len; 00842 if (len > payload_size) 00843 len = payload_size; 00844 stuffing_len = TS_PACKET_SIZE - header_len - len; 00845 if (stuffing_len > 0) { 00846 /* add stuffing with AFC */ 00847 if (buf[3] & 0x20) { 00848 /* stuffing already present: increase its size */ 00849 afc_len = buf[4] + 1; 00850 memmove(buf + 4 + afc_len + stuffing_len, 00851 buf + 4 + afc_len, 00852 header_len - (4 + afc_len)); 00853 buf[4] += stuffing_len; 00854 memset(buf + 4 + afc_len, 0xff, stuffing_len); 00855 } else { 00856 /* add stuffing */ 00857 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); 00858 buf[3] |= 0x20; 00859 buf[4] = stuffing_len - 1; 00860 if (stuffing_len >= 2) { 00861 buf[5] = 0x00; 00862 memset(buf + 6, 0xff, stuffing_len - 2); 00863 } 00864 } 00865 } 00866 memcpy(buf + TS_PACKET_SIZE - len, payload, len); 00867 payload += len; 00868 payload_size -= len; 00869 avio_write(s->pb, buf, TS_PACKET_SIZE); 00870 } 00871 avio_flush(s->pb); 00872 } 00873 00874 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) 00875 { 00876 AVStream *st = s->streams[pkt->stream_index]; 00877 int size = pkt->size; 00878 uint8_t *buf= pkt->data; 00879 uint8_t *data= NULL; 00880 MpegTSWriteStream *ts_st = st->priv_data; 00881 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2; 00882 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; 00883 00884 if (pkt->pts != AV_NOPTS_VALUE) 00885 pts = pkt->pts + delay; 00886 if (pkt->dts != AV_NOPTS_VALUE) 00887 dts = pkt->dts + delay; 00888 00889 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) { 00890 av_log(s, AV_LOG_ERROR, "first pts value must set\n"); 00891 return -1; 00892 } 00893 ts_st->first_pts_check = 0; 00894 00895 if (st->codec->codec_id == CODEC_ID_H264) { 00896 const uint8_t *p = buf, *buf_end = p+size; 00897 uint32_t state = -1; 00898 00899 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { 00900 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, " 00901 "no startcode found, use -vbsf h264_mp4toannexb\n"); 00902 return -1; 00903 } 00904 00905 do { 00906 p = ff_find_start_code(p, buf_end, &state); 00907 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f); 00908 } while (p < buf_end && (state & 0x1f) != 9 && 00909 (state & 0x1f) != 5 && (state & 0x1f) != 1); 00910 00911 if ((state & 0x1f) != 9) { // AUD NAL 00912 data = av_malloc(pkt->size+6); 00913 if (!data) 00914 return -1; 00915 memcpy(data+6, pkt->data, pkt->size); 00916 AV_WB32(data, 0x00000001); 00917 data[4] = 0x09; 00918 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit 00919 buf = data; 00920 size = pkt->size+6; 00921 } 00922 } else if (st->codec->codec_id == CODEC_ID_AAC) { 00923 if (pkt->size < 2) 00924 return -1; 00925 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) { 00926 ADTSContext *adts = ts_st->adts; 00927 int new_size; 00928 if (!adts) { 00929 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format " 00930 "and extradata missing\n"); 00931 return -1; 00932 } 00933 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size; 00934 if ((unsigned)new_size >= INT_MAX) 00935 return -1; 00936 data = av_malloc(new_size); 00937 if (!data) 00938 return AVERROR(ENOMEM); 00939 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size); 00940 if (adts->pce_size) { 00941 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size); 00942 adts->pce_size = 0; 00943 } 00944 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size); 00945 buf = data; 00946 size = new_size; 00947 } 00948 } 00949 00950 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) { 00951 // for video and subtitle, write a single pes packet 00952 mpegts_write_pes(s, st, buf, size, pts, dts); 00953 av_free(data); 00954 return 0; 00955 } 00956 00957 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) { 00958 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 00959 ts_st->payload_pts, ts_st->payload_dts); 00960 ts_st->payload_index = 0; 00961 } 00962 00963 if (!ts_st->payload_index) { 00964 ts_st->payload_pts = pts; 00965 ts_st->payload_dts = dts; 00966 } 00967 00968 memcpy(ts_st->payload + ts_st->payload_index, buf, size); 00969 ts_st->payload_index += size; 00970 00971 av_free(data); 00972 00973 return 0; 00974 } 00975 00976 static int mpegts_write_end(AVFormatContext *s) 00977 { 00978 MpegTSWrite *ts = s->priv_data; 00979 MpegTSWriteStream *ts_st; 00980 MpegTSService *service; 00981 AVStream *st; 00982 int i; 00983 00984 /* flush current packets */ 00985 for(i = 0; i < s->nb_streams; i++) { 00986 st = s->streams[i]; 00987 ts_st = st->priv_data; 00988 if (ts_st->payload_index > 0) { 00989 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 00990 ts_st->payload_pts, ts_st->payload_dts); 00991 } 00992 av_freep(&ts_st->adts); 00993 } 00994 avio_flush(s->pb); 00995 00996 for(i = 0; i < ts->nb_services; i++) { 00997 service = ts->services[i]; 00998 av_freep(&service->provider_name); 00999 av_freep(&service->name); 01000 av_free(service); 01001 } 01002 av_free(ts->services); 01003 01004 return 0; 01005 } 01006 01007 AVOutputFormat ff_mpegts_muxer = { 01008 "mpegts", 01009 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), 01010 "video/x-mpegts", 01011 "ts,m2t", 01012 sizeof(MpegTSWrite), 01013 CODEC_ID_MP2, 01014 CODEC_ID_MPEG2VIDEO, 01015 mpegts_write_header, 01016 mpegts_write_packet, 01017 mpegts_write_end, 01018 .priv_class = &mpegts_muxer_class, 01019 };