FFmpeg: libavformat/mpegtsenc.c Source File

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 "libavutil/dict.h"
00025 #include "libavutil/mathematics.h"
00026 #include "libavutil/opt.h"
00027 #include "libavutil/avassert.h"
00028 #include "libavcodec/mpegvideo.h"
00029 #include "avformat.h"
00030 #include "internal.h"
00031 #include "mpegts.h"
00032 #include "adts.h"
00033 
00034 #define PCR_TIME_BASE 27000000
00035 
00036 /* write DVB SI sections */
00037 
00038 /*********************************************/
00039 /* mpegts section writer */
00040 
00041 typedef struct MpegTSSection {
00042     int pid;
00043     int cc;
00044     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
00045     void *opaque;
00046 } MpegTSSection;
00047 
00048 typedef struct MpegTSService {
00049     MpegTSSection pmt; /* MPEG2 pmt table context */
00050     int sid;           /* service ID */
00051     char *name;
00052     char *provider_name;
00053     int pcr_pid;
00054     int pcr_packet_count;
00055     int pcr_packet_period;
00056 } MpegTSService;
00057 
00058 typedef struct MpegTSWrite {
00059     const AVClass *av_class;
00060     MpegTSSection pat; /* MPEG2 pat table */
00061     MpegTSSection sdt; /* MPEG2 sdt table context */
00062     MpegTSService **services;
00063     int sdt_packet_count;
00064     int sdt_packet_period;
00065     int pat_packet_count;
00066     int pat_packet_period;
00067     int nb_services;
00068     int onid;
00069     int tsid;
00070     int64_t first_pcr;
00071     int mux_rate; 
00072 
00073     int transport_stream_id;
00074     int original_network_id;
00075     int service_id;
00076 
00077     int pmt_start_pid;
00078     int start_pid;
00079     int m2ts_mode;
00080 } MpegTSWrite;
00081 
00082 static const AVOption options[] = {
00083     { "mpegts_transport_stream_id", "Set transport_stream_id field.",
00084       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
00085     { "mpegts_original_network_id", "Set original_network_id field.",
00086       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
00087     { "mpegts_service_id", "Set service_id field.",
00088       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
00089     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
00090       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
00091     { "mpegts_start_pid", "Set the first pid.",
00092       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
00093     {"mpegts_m2ts_mode", "Enable m2ts mode.",
00094         offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.dbl = -1 },
00095         -1,1, AV_OPT_FLAG_ENCODING_PARAM},
00096     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
00097     { NULL },
00098 };
00099 
00100 static const AVClass mpegts_muxer_class = {
00101     .class_name     = "MPEGTS muxer",
00102     .item_name      = av_default_item_name,
00103     .option         = options,
00104     .version        = LIBAVUTIL_VERSION_INT,
00105 };
00106 
00107 /* NOTE: 4 bytes must be left at the end for the crc32 */
00108 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
00109 {
00110     unsigned int crc;
00111     unsigned char packet[TS_PACKET_SIZE];
00112     const unsigned char *buf_ptr;
00113     unsigned char *q;
00114     int first, b, len1, left;
00115 
00116     crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
00117     buf[len - 4] = (crc >> 24) & 0xff;
00118     buf[len - 3] = (crc >> 16) & 0xff;
00119     buf[len - 2] = (crc >> 8) & 0xff;
00120     buf[len - 1] = (crc) & 0xff;
00121 
00122     /* send each packet */
00123     buf_ptr = buf;
00124     while (len > 0) {
00125         first = (buf == buf_ptr);
00126         q = packet;
00127         *q++ = 0x47;
00128         b = (s->pid >> 8);
00129         if (first)
00130             b |= 0x40;
00131         *q++ = b;
00132         *q++ = s->pid;
00133         s->cc = (s->cc + 1) & 0xf;
00134         *q++ = 0x10 | s->cc;
00135         if (first)
00136             *q++ = 0; /* 0 offset */
00137         len1 = TS_PACKET_SIZE - (q - packet);
00138         if (len1 > len)
00139             len1 = len;
00140         memcpy(q, buf_ptr, len1);
00141         q += len1;
00142         /* add known padding data */
00143         left = TS_PACKET_SIZE - (q - packet);
00144         if (left > 0)
00145             memset(q, 0xff, left);
00146 
00147         s->write_packet(s, packet);
00148 
00149         buf_ptr += len1;
00150         len -= len1;
00151     }
00152 }
00153 
00154 static inline void put16(uint8_t **q_ptr, int val)
00155 {
00156     uint8_t *q;
00157     q = *q_ptr;
00158     *q++ = val >> 8;
00159     *q++ = val;
00160     *q_ptr = q;
00161 }
00162 
00163 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
00164                           int version, int sec_num, int last_sec_num,
00165                           uint8_t *buf, int len)
00166 {
00167     uint8_t section[1024], *q;
00168     unsigned int tot_len;
00169     /* reserved_future_use field must be set to 1 for SDT */
00170     unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
00171 
00172     tot_len = 3 + 5 + len + 4;
00173     /* check if not too big */
00174     if (tot_len > 1024)
00175         return -1;
00176 
00177     q = section;
00178     *q++ = tid;
00179     put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
00180     put16(&q, id);
00181     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
00182     *q++ = sec_num;
00183     *q++ = last_sec_num;
00184     memcpy(q, buf, len);
00185 
00186     mpegts_write_section(s, section, tot_len);
00187     return 0;
00188 }
00189 
00190 /*********************************************/
00191 /* mpegts writer */
00192 
00193 #define DEFAULT_PROVIDER_NAME   "FFmpeg"
00194 #define DEFAULT_SERVICE_NAME    "Service01"
00195 
00196 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
00197 #define DEFAULT_PES_HEADER_FREQ 16
00198 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
00199 
00200 /* we retransmit the SI info at this rate */
00201 #define SDT_RETRANS_TIME 500
00202 #define PAT_RETRANS_TIME 100
00203 #define PCR_RETRANS_TIME 20
00204 
00205 typedef struct MpegTSWriteStream {
00206     struct MpegTSService *service;
00207     int pid; /* stream associated pid */
00208     int cc;
00209     int payload_index;
00210     int first_pts_check; 
00211     int64_t payload_pts;
00212     int64_t payload_dts;
00213     int payload_flags;
00214     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
00215     ADTSContext *adts;
00216 } MpegTSWriteStream;
00217 
00218 static void mpegts_write_pat(AVFormatContext *s)
00219 {
00220     MpegTSWrite *ts = s->priv_data;
00221     MpegTSService *service;
00222     uint8_t data[1012], *q;
00223     int i;
00224 
00225     q = data;
00226     for(i = 0; i < ts->nb_services; i++) {
00227         service = ts->services[i];
00228         put16(&q, service->sid);
00229         put16(&q, 0xe000 | service->pmt.pid);
00230     }
00231     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
00232                           data, q - data);
00233 }
00234 
00235 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
00236 {
00237     //    MpegTSWrite *ts = s->priv_data;
00238     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
00239     int val, stream_type, i;
00240 
00241     q = data;
00242     put16(&q, 0xe000 | service->pcr_pid);
00243 
00244     program_info_length_ptr = q;
00245     q += 2; /* patched after */
00246 
00247     /* put program info here */
00248 
00249     val = 0xf000 | (q - program_info_length_ptr - 2);
00250     program_info_length_ptr[0] = val >> 8;
00251     program_info_length_ptr[1] = val;
00252 
00253     for(i = 0; i < s->nb_streams; i++) {
00254         AVStream *st = s->streams[i];
00255         MpegTSWriteStream *ts_st = st->priv_data;
00256         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
00257         switch(st->codec->codec_id) {
00258         case CODEC_ID_MPEG1VIDEO:
00259         case CODEC_ID_MPEG2VIDEO:
00260             stream_type = STREAM_TYPE_VIDEO_MPEG2;
00261             break;
00262         case CODEC_ID_MPEG4:
00263             stream_type = STREAM_TYPE_VIDEO_MPEG4;
00264             break;
00265         case CODEC_ID_H264:
00266             stream_type = STREAM_TYPE_VIDEO_H264;
00267             break;
00268         case CODEC_ID_DIRAC:
00269             stream_type = STREAM_TYPE_VIDEO_DIRAC;
00270             break;
00271         case CODEC_ID_MP2:
00272         case CODEC_ID_MP3:
00273             stream_type = STREAM_TYPE_AUDIO_MPEG1;
00274             break;
00275         case CODEC_ID_AAC:
00276             stream_type = STREAM_TYPE_AUDIO_AAC;
00277             break;
00278         case CODEC_ID_AAC_LATM:
00279             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
00280             break;
00281         case CODEC_ID_AC3:
00282             stream_type = STREAM_TYPE_AUDIO_AC3;
00283             break;
00284         default:
00285             stream_type = STREAM_TYPE_PRIVATE_DATA;
00286             break;
00287         }
00288         *q++ = stream_type;
00289         put16(&q, 0xe000 | ts_st->pid);
00290         desc_length_ptr = q;
00291         q += 2; /* patched after */
00292 
00293         /* write optional descriptors here */
00294         switch(st->codec->codec_type) {
00295         case AVMEDIA_TYPE_AUDIO:
00296             if(st->codec->codec_id==CODEC_ID_EAC3){
00297                 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
00298                 *q++=1; // 1 byte, all flags sets to 0
00299                 *q++=0; // omit all fields...
00300             }
00301 
00302             if (lang) {
00303                 char *p;
00304                 char *next = lang->value;
00305                 uint8_t *len_ptr;
00306 
00307                 *q++ = 0x0a; /* ISO 639 language descriptor */
00308                 len_ptr = q++;
00309                 *len_ptr = 0;
00310 
00311                 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
00312                     next = strchr(p, ',');
00313                     if (strlen(p) != 3 && (!next || next != p + 3))
00314                         continue; /* not a 3-letter code */
00315 
00316                     *q++ = *p++;
00317                     *q++ = *p++;
00318                     *q++ = *p++;
00319 
00320                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
00321                     *q++ = 0x01;
00322                 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
00323                     *q++ = 0x02;
00324                 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
00325                     *q++ = 0x03;
00326                 else
00327                     *q++ = 0; /* undefined type */
00328 
00329                     *len_ptr += 4;
00330                 }
00331 
00332                 if (*len_ptr == 0)
00333                     q -= 2; /* no language codes were written */
00334             }
00335             break;
00336         case AVMEDIA_TYPE_SUBTITLE:
00337             {
00338                 const char *language;
00339                 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
00340                 *q++ = 0x59;
00341                 *q++ = 8;
00342                 *q++ = language[0];
00343                 *q++ = language[1];
00344                 *q++ = language[2];
00345                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
00346                 if(st->codec->extradata_size == 4) {
00347                     memcpy(q, st->codec->extradata, 4);
00348                     q += 4;
00349                 } else {
00350                     put16(&q, 1); /* page id */
00351                     put16(&q, 1); /* ancillary page id */
00352                 }
00353             }
00354             break;
00355         case AVMEDIA_TYPE_VIDEO:
00356             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
00357                 *q++ = 0x05; /*MPEG-2 registration descriptor*/
00358                 *q++ = 4;
00359                 *q++ = 'd';
00360                 *q++ = 'r';
00361                 *q++ = 'a';
00362                 *q++ = 'c';
00363             }
00364             break;
00365         }
00366 
00367         val = 0xf000 | (q - desc_length_ptr - 2);
00368         desc_length_ptr[0] = val >> 8;
00369         desc_length_ptr[1] = val;
00370     }
00371     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
00372                           data, q - data);
00373 }
00374 
00375 /* NOTE: str == NULL is accepted for an empty string */
00376 static void putstr8(uint8_t **q_ptr, const char *str)
00377 {
00378     uint8_t *q;
00379     int len;
00380 
00381     q = *q_ptr;
00382     if (!str)
00383         len = 0;
00384     else
00385         len = strlen(str);
00386     *q++ = len;
00387     memcpy(q, str, len);
00388     q += len;
00389     *q_ptr = q;
00390 }
00391 
00392 static void mpegts_write_sdt(AVFormatContext *s)
00393 {
00394     MpegTSWrite *ts = s->priv_data;
00395     MpegTSService *service;
00396     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
00397     int i, running_status, free_ca_mode, val;
00398 
00399     q = data;
00400     put16(&q, ts->onid);
00401     *q++ = 0xff;
00402     for(i = 0; i < ts->nb_services; i++) {
00403         service = ts->services[i];
00404         put16(&q, service->sid);
00405         *q++ = 0xfc | 0x00; /* currently no EIT info */
00406         desc_list_len_ptr = q;
00407         q += 2;
00408         running_status = 4; /* running */
00409         free_ca_mode = 0;
00410 
00411         /* write only one descriptor for the service name and provider */
00412         *q++ = 0x48;
00413         desc_len_ptr = q;
00414         q++;
00415         *q++ = 0x01; /* digital television service */
00416         putstr8(&q, service->provider_name);
00417         putstr8(&q, service->name);
00418         desc_len_ptr[0] = q - desc_len_ptr - 1;
00419 
00420         /* fill descriptor length */
00421         val = (running_status << 13) | (free_ca_mode << 12) |
00422             (q - desc_list_len_ptr - 2);
00423         desc_list_len_ptr[0] = val >> 8;
00424         desc_list_len_ptr[1] = val;
00425     }
00426     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
00427                           data, q - data);
00428 }
00429 
00430 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
00431                                          int sid,
00432                                          const char *provider_name,
00433                                          const char *name)
00434 {
00435     MpegTSService *service;
00436 
00437     service = av_mallocz(sizeof(MpegTSService));
00438     if (!service)
00439         return NULL;
00440     service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
00441     service->sid = sid;
00442     service->provider_name = av_strdup(provider_name);
00443     service->name = av_strdup(name);
00444     service->pcr_pid = 0x1fff;
00445     dynarray_add(&ts->services, &ts->nb_services, service);
00446     return service;
00447 }
00448 
00449 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
00450 {
00451     return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
00452            ts->first_pcr;
00453 }
00454 
00455 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
00456 {
00457     MpegTSWrite *ts = s->priv_data;
00458     if (ts->m2ts_mode) {
00459         int64_t pcr = get_pcr(s->priv_data, s->pb);
00460         uint32_t tp_extra_header = pcr % 0x3fffffff;
00461         tp_extra_header = AV_RB32(&tp_extra_header);
00462         avio_write(s->pb, (unsigned char *) &tp_extra_header,
00463                 sizeof(tp_extra_header));
00464     }
00465 }
00466 
00467 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
00468 {
00469     AVFormatContext *ctx = s->opaque;
00470     mpegts_prefix_m2ts_header(ctx);
00471     avio_write(ctx->pb, packet, TS_PACKET_SIZE);
00472 }
00473 
00474 static int mpegts_write_header(AVFormatContext *s)
00475 {
00476     MpegTSWrite *ts = s->priv_data;
00477     MpegTSWriteStream *ts_st;
00478     MpegTSService *service;
00479     AVStream *st, *pcr_st = NULL;
00480     AVDictionaryEntry *title, *provider;
00481     int i, j;
00482     const char *service_name;
00483     const char *provider_name;
00484     int *pids;
00485 
00486     ts->tsid = ts->transport_stream_id;
00487     ts->onid = ts->original_network_id;
00488     /* allocate a single DVB service */
00489     title = av_dict_get(s->metadata, "service_name", NULL, 0);
00490     if (!title)
00491         title = av_dict_get(s->metadata, "title", NULL, 0);
00492     service_name = title ? title->value : DEFAULT_SERVICE_NAME;
00493     provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
00494     provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
00495     service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
00496     service->pmt.write_packet = section_write_packet;
00497     service->pmt.opaque = s;
00498     service->pmt.cc = 15;
00499 
00500     ts->pat.pid = PAT_PID;
00501     ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
00502     ts->pat.write_packet = section_write_packet;
00503     ts->pat.opaque = s;
00504 
00505     ts->sdt.pid = SDT_PID;
00506     ts->sdt.cc = 15;
00507     ts->sdt.write_packet = section_write_packet;
00508     ts->sdt.opaque = s;
00509 
00510     pids = av_malloc(s->nb_streams * sizeof(*pids));
00511     if (!pids)
00512         return AVERROR(ENOMEM);
00513 
00514     /* assign pids to each stream */
00515     for(i = 0;i < s->nb_streams; i++) {
00516         st = s->streams[i];
00517         avpriv_set_pts_info(st, 33, 1, 90000);
00518         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
00519         if (!ts_st)
00520             goto fail;
00521         st->priv_data = ts_st;
00522         ts_st->service = service;
00523         /* MPEG pid values < 16 are reserved. Applications which set st->id in
00524          * this range are assigned a calculated pid. */
00525         if (st->id < 16) {
00526             ts_st->pid = ts->start_pid + i;
00527         } else if (st->id < 0x1FFF) {
00528             ts_st->pid = st->id;
00529         } else {
00530             av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
00531             goto fail;
00532         }
00533         if (ts_st->pid == service->pmt.pid) {
00534             av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
00535             goto fail;
00536         }
00537         for (j = 0; j < i; j++)
00538             if (pids[j] == ts_st->pid) {
00539                 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
00540                 goto fail;
00541             }
00542         pids[i] = ts_st->pid;
00543         ts_st->payload_pts = AV_NOPTS_VALUE;
00544         ts_st->payload_dts = AV_NOPTS_VALUE;
00545         ts_st->first_pts_check = 1;
00546         ts_st->cc = 15;
00547         /* update PCR pid by using the first video stream */
00548         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
00549             service->pcr_pid == 0x1fff) {
00550             service->pcr_pid = ts_st->pid;
00551             pcr_st = st;
00552         }
00553         if (st->codec->codec_id == CODEC_ID_AAC &&
00554             st->codec->extradata_size > 0) {
00555             ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
00556             if (!ts_st->adts)
00557                 return AVERROR(ENOMEM);
00558             if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
00559                                          st->codec->extradata_size) < 0)
00560                 return -1;
00561         }
00562     }
00563 
00564     av_free(pids);
00565 
00566     /* if no video stream, use the first stream as PCR */
00567     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
00568         pcr_st = s->streams[0];
00569         ts_st = pcr_st->priv_data;
00570         service->pcr_pid = ts_st->pid;
00571     }
00572 
00573 #if FF_API_MUXRATE
00574     if (s->mux_rate)
00575         ts->mux_rate = s->mux_rate;
00576 #endif
00577 
00578     if (ts->mux_rate > 1) {
00579         service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
00580             (TS_PACKET_SIZE * 8 * 1000);
00581         ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
00582             (TS_PACKET_SIZE * 8 * 1000);
00583         ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
00584             (TS_PACKET_SIZE * 8 * 1000);
00585 
00586         ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
00587     } else {
00588         /* Arbitrary values, PAT/PMT could be written on key frames */
00589         ts->sdt_packet_period = 200;
00590         ts->pat_packet_period = 40;
00591         if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00592             if (!pcr_st->codec->frame_size) {
00593                 av_log(s, AV_LOG_WARNING, "frame size not set\n");
00594                 service->pcr_packet_period =
00595                     pcr_st->codec->sample_rate/(10*512);
00596             } else {
00597                 service->pcr_packet_period =
00598                     pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
00599             }
00600         } else {
00601             // max delta PCR 0.1s
00602             service->pcr_packet_period =
00603                 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
00604         }
00605     }
00606 
00607     // output a PCR as soon as possible
00608     service->pcr_packet_count = service->pcr_packet_period;
00609     ts->pat_packet_count = ts->pat_packet_period-1;
00610     ts->sdt_packet_count = ts->sdt_packet_period-1;
00611 
00612     if (ts->mux_rate == 1)
00613         av_log(s, AV_LOG_INFO, "muxrate VBR, ");
00614     else
00615         av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
00616     av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
00617            "sdt every %d, pat/pmt every %d pkts\n",
00618            service->pcr_packet_period,
00619            ts->sdt_packet_period, ts->pat_packet_period);
00620 
00621     if (ts->m2ts_mode == -1) {
00622         if (av_match_ext(s->filename, "m2ts")) {
00623             ts->m2ts_mode = 1;
00624         } else {
00625             ts->m2ts_mode = 0;
00626         }
00627     }
00628 
00629     avio_flush(s->pb);
00630 
00631     return 0;
00632 
00633  fail:
00634     av_free(pids);
00635     for(i = 0;i < s->nb_streams; i++) {
00636         st = s->streams[i];
00637         av_freep(&st->priv_data);
00638     }
00639     return -1;
00640 }
00641 
00642 /* send SDT, PAT and PMT tables regulary */
00643 static void retransmit_si_info(AVFormatContext *s)
00644 {
00645     MpegTSWrite *ts = s->priv_data;
00646     int i;
00647 
00648     if (++ts->sdt_packet_count == ts->sdt_packet_period) {
00649         ts->sdt_packet_count = 0;
00650         mpegts_write_sdt(s);
00651     }
00652     if (++ts->pat_packet_count == ts->pat_packet_period) {
00653         ts->pat_packet_count = 0;
00654         mpegts_write_pat(s);
00655         for(i = 0; i < ts->nb_services; i++) {
00656             mpegts_write_pmt(s, ts->services[i]);
00657         }
00658     }
00659 }
00660 
00661 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
00662 {
00663     int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
00664 
00665     *buf++ = pcr_high >> 25;
00666     *buf++ = pcr_high >> 17;
00667     *buf++ = pcr_high >> 9;
00668     *buf++ = pcr_high >> 1;
00669     *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
00670     *buf++ = pcr_low;
00671 
00672     return 6;
00673 }
00674 
00675 /* Write a single null transport stream packet */
00676 static void mpegts_insert_null_packet(AVFormatContext *s)
00677 {
00678     uint8_t *q;
00679     uint8_t buf[TS_PACKET_SIZE];
00680 
00681     q = buf;
00682     *q++ = 0x47;
00683     *q++ = 0x00 | 0x1f;
00684     *q++ = 0xff;
00685     *q++ = 0x10;
00686     memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
00687     mpegts_prefix_m2ts_header(s);
00688     avio_write(s->pb, buf, TS_PACKET_SIZE);
00689 }
00690 
00691 /* Write a single transport stream packet with a PCR and no payload */
00692 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
00693 {
00694     MpegTSWrite *ts = s->priv_data;
00695     MpegTSWriteStream *ts_st = st->priv_data;
00696     uint8_t *q;
00697     uint8_t buf[TS_PACKET_SIZE];
00698 
00699     q = buf;
00700     *q++ = 0x47;
00701     *q++ = ts_st->pid >> 8;
00702     *q++ = ts_st->pid;
00703     *q++ = 0x20 | ts_st->cc;   /* Adaptation only */
00704     /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
00705     *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
00706     *q++ = 0x10;               /* Adaptation flags: PCR present */
00707 
00708     /* PCR coded into 6 bytes */
00709     q += write_pcr_bits(q, get_pcr(ts, s->pb));
00710 
00711     /* stuffing bytes */
00712     memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
00713     mpegts_prefix_m2ts_header(s);
00714     avio_write(s->pb, buf, TS_PACKET_SIZE);
00715 }
00716 
00717 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
00718 {
00719     int val;
00720 
00721     val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
00722     *q++ = val;
00723     val = (((pts >> 15) & 0x7fff) << 1) | 1;
00724     *q++ = val >> 8;
00725     *q++ = val;
00726     val = (((pts) & 0x7fff) << 1) | 1;
00727     *q++ = val >> 8;
00728     *q++ = val;
00729 }
00730 
00731 /* Set an adaptation field flag in an MPEG-TS packet*/
00732 static void set_af_flag(uint8_t *pkt, int flag)
00733 {
00734     // expect at least one flag to set
00735     assert(flag);
00736 
00737     if ((pkt[3] & 0x20) == 0) {
00738         // no AF yet, set adaptation field flag
00739         pkt[3] |= 0x20;
00740         // 1 byte length, no flags
00741         pkt[4] = 1;
00742         pkt[5] = 0;
00743     }
00744     pkt[5] |= flag;
00745 }
00746 
00747 /* Extend the adaptation field by size bytes */
00748 static void extend_af(uint8_t *pkt, int size)
00749 {
00750     // expect already existing adaptation field
00751     assert(pkt[3] & 0x20);
00752     pkt[4] += size;
00753 }
00754 
00755 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
00756 static uint8_t *get_ts_payload_start(uint8_t *pkt)
00757 {
00758     if (pkt[3] & 0x20)
00759         return pkt + 5 + pkt[4];
00760     else
00761         return pkt + 4;
00762 }
00763 
00764 /* Add a pes header to the front of payload, and segment into an integer number of
00765  * ts packets. The final ts packet is padded using an over-sized adaptation header
00766  * to exactly fill the last ts packet.
00767  * NOTE: 'payload' contains a complete PES payload.
00768  */
00769 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
00770                              const uint8_t *payload, int payload_size,
00771                              int64_t pts, int64_t dts, int key)
00772 {
00773     MpegTSWriteStream *ts_st = st->priv_data;
00774     MpegTSWrite *ts = s->priv_data;
00775     uint8_t buf[TS_PACKET_SIZE];
00776     uint8_t *q;
00777     int val, is_start, len, header_len, write_pcr, private_code, flags;
00778     int afc_len, stuffing_len;
00779     int64_t pcr = -1; /* avoid warning */
00780     int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
00781 
00782     is_start = 1;
00783     while (payload_size > 0) {
00784         retransmit_si_info(s);
00785 
00786         write_pcr = 0;
00787         if (ts_st->pid == ts_st->service->pcr_pid) {
00788             if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
00789                 ts_st->service->pcr_packet_count++;
00790             if (ts_st->service->pcr_packet_count >=
00791                 ts_st->service->pcr_packet_period) {
00792                 ts_st->service->pcr_packet_count = 0;
00793                 write_pcr = 1;
00794             }
00795         }
00796 
00797         if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
00798             (dts - get_pcr(ts, s->pb)/300) > delay) {
00799             /* pcr insert gets priority over null packet insert */
00800             if (write_pcr)
00801                 mpegts_insert_pcr_only(s, st);
00802             else
00803                 mpegts_insert_null_packet(s);
00804             continue; /* recalculate write_pcr and possibly retransmit si_info */
00805         }
00806 
00807         /* prepare packet header */
00808         q = buf;
00809         *q++ = 0x47;
00810         val = (ts_st->pid >> 8);
00811         if (is_start)
00812             val |= 0x40;
00813         *q++ = val;
00814         *q++ = ts_st->pid;
00815         ts_st->cc = (ts_st->cc + 1) & 0xf;
00816         *q++ = 0x10 | ts_st->cc; // payload indicator + CC
00817         if (key && is_start && pts != AV_NOPTS_VALUE) {
00818             // set Random Access for key frames
00819             if (ts_st->pid == ts_st->service->pcr_pid)
00820                 write_pcr = 1;
00821             set_af_flag(buf, 0x40);
00822             q = get_ts_payload_start(buf);
00823         }
00824         if (write_pcr) {
00825             set_af_flag(buf, 0x10);
00826             q = get_ts_payload_start(buf);
00827             // add 11, pcr references the last byte of program clock reference base
00828             if (ts->mux_rate > 1)
00829                 pcr = get_pcr(ts, s->pb);
00830             else
00831                 pcr = (dts - delay)*300;
00832             if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
00833                 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
00834             extend_af(buf, write_pcr_bits(q, pcr));
00835             q = get_ts_payload_start(buf);
00836         }
00837         if (is_start) {
00838             int pes_extension = 0;
00839             /* write PES header */
00840             *q++ = 0x00;
00841             *q++ = 0x00;
00842             *q++ = 0x01;
00843             private_code = 0;
00844             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00845                 if (st->codec->codec_id == CODEC_ID_DIRAC) {
00846                     *q++ = 0xfd;
00847                 } else
00848                     *q++ = 0xe0;
00849             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
00850                        (st->codec->codec_id == CODEC_ID_MP2 ||
00851                         st->codec->codec_id == CODEC_ID_MP3 ||
00852                         st->codec->codec_id == CODEC_ID_AAC)) {
00853                 *q++ = 0xc0;
00854             } else {
00855                 *q++ = 0xbd;
00856                 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
00857                     private_code = 0x20;
00858                 }
00859             }
00860             header_len = 0;
00861             flags = 0;
00862             if (pts != AV_NOPTS_VALUE) {
00863                 header_len += 5;
00864                 flags |= 0x80;
00865             }
00866             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
00867                 header_len += 5;
00868                 flags |= 0x40;
00869             }
00870             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
00871                 st->codec->codec_id == CODEC_ID_DIRAC) {
00872                 /* set PES_extension_flag */
00873                 pes_extension = 1;
00874                 flags |= 0x01;
00875 
00876                 /*
00877                 * One byte for PES2 extension flag +
00878                 * one byte for extension length +
00879                 * one byte for extension id
00880                 */
00881                 header_len += 3;
00882             }
00883             len = payload_size + header_len + 3;
00884             if (private_code != 0)
00885                 len++;
00886             if (len > 0xffff)
00887                 len = 0;
00888             *q++ = len >> 8;
00889             *q++ = len;
00890             val = 0x80;
00891             /* data alignment indicator is required for subtitle data */
00892             if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
00893                 val |= 0x04;
00894             *q++ = val;
00895             *q++ = flags;
00896             *q++ = header_len;
00897             if (pts != AV_NOPTS_VALUE) {
00898                 write_pts(q, flags >> 6, pts);
00899                 q += 5;
00900             }
00901             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
00902                 write_pts(q, 1, dts);
00903                 q += 5;
00904             }
00905             if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
00906                 flags = 0x01;  /* set PES_extension_flag_2 */
00907                 *q++ = flags;
00908                 *q++ = 0x80 | 0x01;  /* marker bit + extension length */
00909                 /*
00910                 * Set the stream id extension flag bit to 0 and
00911                 * write the extended stream id
00912                 */
00913                 *q++ = 0x00 | 0x60;
00914             }
00915             if (private_code != 0)
00916                 *q++ = private_code;
00917             is_start = 0;
00918         }
00919         /* header size */
00920         header_len = q - buf;
00921         /* data len */
00922         len = TS_PACKET_SIZE - header_len;
00923         if (len > payload_size)
00924             len = payload_size;
00925         stuffing_len = TS_PACKET_SIZE - header_len - len;
00926         if (stuffing_len > 0) {
00927             /* add stuffing with AFC */
00928             if (buf[3] & 0x20) {
00929                 /* stuffing already present: increase its size */
00930                 afc_len = buf[4] + 1;
00931                 memmove(buf + 4 + afc_len + stuffing_len,
00932                         buf + 4 + afc_len,
00933                         header_len - (4 + afc_len));
00934                 buf[4] += stuffing_len;
00935                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
00936             } else {
00937                 /* add stuffing */
00938                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
00939                 buf[3] |= 0x20;
00940                 buf[4] = stuffing_len - 1;
00941                 if (stuffing_len >= 2) {
00942                     buf[5] = 0x00;
00943                     memset(buf + 6, 0xff, stuffing_len - 2);
00944                 }
00945             }
00946         }
00947         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
00948         payload += len;
00949         payload_size -= len;
00950         mpegts_prefix_m2ts_header(s);
00951         avio_write(s->pb, buf, TS_PACKET_SIZE);
00952     }
00953     avio_flush(s->pb);
00954 }
00955 
00956 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
00957 {
00958     AVStream *st = s->streams[pkt->stream_index];
00959     int size = pkt->size;
00960     uint8_t *buf= pkt->data;
00961     uint8_t *data= NULL;
00962     MpegTSWriteStream *ts_st = st->priv_data;
00963     const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
00964     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
00965 
00966     if (pkt->pts != AV_NOPTS_VALUE)
00967         pts = pkt->pts + delay;
00968     if (pkt->dts != AV_NOPTS_VALUE)
00969         dts = pkt->dts + delay;
00970 
00971     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
00972         av_log(s, AV_LOG_ERROR, "first pts value must set\n");
00973         return -1;
00974     }
00975     ts_st->first_pts_check = 0;
00976 
00977     if (st->codec->codec_id == CODEC_ID_H264) {
00978         const uint8_t *p = buf, *buf_end = p+size;
00979         uint32_t state = -1;
00980 
00981         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
00982             av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
00983                    "no startcode found, use -vbsf h264_mp4toannexb\n");
00984             return -1;
00985         }
00986 
00987         do {
00988             p = avpriv_mpv_find_start_code(p, buf_end, &state);
00989             //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
00990         } while (p < buf_end && (state & 0x1f) != 9 &&
00991                  (state & 0x1f) != 5 && (state & 0x1f) != 1);
00992 
00993         if ((state & 0x1f) != 9) { // AUD NAL
00994             data = av_malloc(pkt->size+6);
00995             if (!data)
00996                 return -1;
00997             memcpy(data+6, pkt->data, pkt->size);
00998             AV_WB32(data, 0x00000001);
00999             data[4] = 0x09;
01000             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
01001             buf  = data;
01002             size = pkt->size+6;
01003         }
01004     } else if (st->codec->codec_id == CODEC_ID_AAC) {
01005         if (pkt->size < 2)
01006             return -1;
01007         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
01008             ADTSContext *adts = ts_st->adts;
01009             int new_size, err;
01010             if (!adts) {
01011                 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
01012                        "and extradata missing\n");
01013                 return -1;
01014             }
01015             new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
01016             if ((unsigned)new_size >= INT_MAX)
01017                 return -1;
01018             data = av_malloc(new_size);
01019             if (!data)
01020                 return AVERROR(ENOMEM);
01021             err = ff_adts_write_frame_header(adts, data, pkt->size,
01022                                              adts->pce_size);
01023             if (err < 0) {
01024                 av_free(data);
01025                 return err;
01026             }
01027             if (adts->pce_size) {
01028                 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
01029                 adts->pce_size = 0;
01030             }
01031             memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
01032             buf = data;
01033             size = new_size;
01034         }
01035     }
01036 
01037     if (ts_st->payload_index && ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
01038         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
01039                          ts_st->payload_pts, ts_st->payload_dts,
01040                          ts_st->payload_flags & AV_PKT_FLAG_KEY);
01041         ts_st->payload_index = 0;
01042     }
01043 
01044     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > DEFAULT_PES_PAYLOAD_SIZE) {
01045         av_assert0(!ts_st->payload_index);
01046         // for video and subtitle, write a single pes packet
01047         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
01048         av_free(data);
01049         return 0;
01050     }
01051 
01052     if (!ts_st->payload_index) {
01053         ts_st->payload_pts = pts;
01054         ts_st->payload_dts = dts;
01055         ts_st->payload_flags = pkt->flags;
01056     }
01057 
01058     memcpy(ts_st->payload + ts_st->payload_index, buf, size);
01059     ts_st->payload_index += size;
01060 
01061     av_free(data);
01062 
01063     return 0;
01064 }
01065 
01066 static int mpegts_write_end(AVFormatContext *s)
01067 {
01068     MpegTSWrite *ts = s->priv_data;
01069     MpegTSWriteStream *ts_st;
01070     MpegTSService *service;
01071     AVStream *st;
01072     int i;
01073 
01074     /* flush current packets */
01075     for(i = 0; i < s->nb_streams; i++) {
01076         st = s->streams[i];
01077         ts_st = st->priv_data;
01078         if (ts_st->payload_index > 0) {
01079             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
01080                              ts_st->payload_pts, ts_st->payload_dts,
01081                              ts_st->payload_flags & AV_PKT_FLAG_KEY);
01082         }
01083         av_freep(&ts_st->adts);
01084     }
01085     avio_flush(s->pb);
01086 
01087     for(i = 0; i < ts->nb_services; i++) {
01088         service = ts->services[i];
01089         av_freep(&service->provider_name);
01090         av_freep(&service->name);
01091         av_free(service);
01092     }
01093     av_free(ts->services);
01094 
01095     return 0;
01096 }
01097 
01098 AVOutputFormat ff_mpegts_muxer = {
01099     .name              = "mpegts",
01100     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
01101     .mime_type         = "video/x-mpegts",
01102     .extensions        = "ts,m2t,m2ts,mts",
01103     .priv_data_size    = sizeof(MpegTSWrite),
01104     .audio_codec       = CODEC_ID_MP2,
01105     .video_codec       = CODEC_ID_MPEG2VIDEO,
01106     .write_header      = mpegts_write_header,
01107     .write_packet      = mpegts_write_packet,
01108     .write_trailer     = mpegts_write_end,
01109     .priv_class = &mpegts_muxer_class,
01110 };