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FFmpeg/libavformat/mpegtsenc.c

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  1. /*

  2.  * MPEG2 transport stream (aka DVB) muxer

  3.  * Copyright (c) 2003 Fabrice Bellard

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "libavutil/bswap.h"

  23. #include "libavutil/crc.h"

  24. #include "libavutil/dict.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/mathematics.h"

  27. #include "libavutil/opt.h"

  28. #include "libavcodec/internal.h"

  29. #include "avformat.h"

  30. #include "internal.h"

  31. #include "mpegts.h"

  32. 

  33. #define PCR_TIME_BASE 27000000

  34. 

  35. /* write DVB SI sections */

  36. 

  37. /*********************************************/

  38. /* mpegts section writer */

  39. 

  40. typedef struct MpegTSSection {

  41.     int pid;

  42.     int cc;

  43.     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);

  44.     void *opaque;

  45. } MpegTSSection;

  46. 

  47. typedef struct MpegTSService {

  48.     MpegTSSection pmt; /* MPEG2 pmt table context */

  49.     int sid;           /* service ID */

  50.     char *name;

  51.     char *provider_name;

  52.     int pcr_pid;

  53.     int pcr_packet_count;

  54.     int pcr_packet_period;

  55. } MpegTSService;

  56. 

  57. typedef struct MpegTSWrite {

  58.     const AVClass *av_class;

  59.     MpegTSSection pat; /* MPEG2 pat table */

  60.     MpegTSSection sdt; /* MPEG2 sdt table context */

  61.     MpegTSService **services;

  62.     int sdt_packet_count;

  63.     int sdt_packet_period;

  64.     int pat_packet_count;

  65.     int pat_packet_period;

  66.     int nb_services;

  67.     int onid;

  68.     int tsid;

  69.     int64_t first_pcr;

  70.     int mux_rate; ///< set to 1 when VBR

  71.     int pes_payload_size;

  72. 

  73.     int transport_stream_id;

  74.     int original_network_id;

  75.     int service_id;

  76. 

  77.     int pmt_start_pid;

  78.     int start_pid;

  79. 

  80.     int reemit_pat_pmt; // backward compatibility

  81. 

  82.     int pcr_period;

  83. #define MPEGTS_FLAG_REEMIT_PAT_PMT  0x01

  84. #define MPEGTS_FLAG_AAC_LATM        0x02

  85.     int flags;

  86. } MpegTSWrite;

  87. 

  88. /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */

  89. #define DEFAULT_PES_HEADER_FREQ 16

  90. #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)

  91. 

  92. /* The section length is 12 bits. The first 2 are set to 0, the remaining

  93.  * 10 bits should not exceed 1021. */

  94. #define SECTION_LENGTH 1020

  95. 

  96. /* NOTE: 4 bytes must be left at the end for the crc32 */

  97. static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)

  98. {

  99.     unsigned int crc;

  100.     unsigned char packet[TS_PACKET_SIZE];

  101.     const unsigned char *buf_ptr;

  102.     unsigned char *q;

  103.     int first, b, len1, left;

  104. 

  105.     crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));

  106.     buf[len - 4] = (crc >> 24) & 0xff;

  107.     buf[len - 3] = (crc >> 16) & 0xff;

  108.     buf[len - 2] = (crc >> 8) & 0xff;

  109.     buf[len - 1] = (crc) & 0xff;

  110. 

  111.     /* send each packet */

  112.     buf_ptr = buf;

  113.     while (len > 0) {

  114.         first = (buf == buf_ptr);

  115.         q = packet;

  116.         *q++ = 0x47;

  117.         b = (s->pid >> 8);

  118.         if (first)

  119.             b |= 0x40;

  120.         *q++ = b;

  121.         *q++ = s->pid;

  122.         s->cc = (s->cc + 1) & 0xf;

  123.         *q++ = 0x10 | s->cc;

  124.         if (first)

  125.             *q++ = 0; /* 0 offset */

  126.         len1 = TS_PACKET_SIZE - (q - packet);

  127.         if (len1 > len)

  128.             len1 = len;

  129.         memcpy(q, buf_ptr, len1);

  130.         q += len1;

  131.         /* add known padding data */

  132.         left = TS_PACKET_SIZE - (q - packet);

  133.         if (left > 0)

  134.             memset(q, 0xff, left);

  135. 

  136.         s->write_packet(s, packet);

  137. 

  138.         buf_ptr += len1;

  139.         len -= len1;

  140.     }

  141. }

  142. 

  143. static inline void put16(uint8_t **q_ptr, int val)

  144. {

  145.     uint8_t *q;

  146.     q = *q_ptr;

  147.     *q++ = val >> 8;

  148.     *q++ = val;

  149.     *q_ptr = q;

  150. }

  151. 

  152. static int mpegts_write_section1(MpegTSSection *s, int tid, int id,

  153.                           int version, int sec_num, int last_sec_num,

  154.                           uint8_t *buf, int len)

  155. {

  156.     uint8_t section[1024], *q;

  157.     unsigned int tot_len;

  158.     /* reserved_future_use field must be set to 1 for SDT */

  159.     unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;

  160. 

  161.     tot_len = 3 + 5 + len + 4;

  162.     /* check if not too big */

  163.     if (tot_len > 1024)

  164.         return -1;

  165. 

  166.     q = section;

  167.     *q++ = tid;

  168.     put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */

  169.     put16(&q, id);

  170.     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */

  171.     *q++ = sec_num;

  172.     *q++ = last_sec_num;

  173.     memcpy(q, buf, len);

  174. 

  175.     mpegts_write_section(s, section, tot_len);

  176.     return 0;

  177. }

  178. 

  179. /*********************************************/

  180. /* mpegts writer */

  181. 

  182. #define DEFAULT_PROVIDER_NAME   "Libav"

  183. #define DEFAULT_SERVICE_NAME    "Service01"

  184. 

  185. /* we retransmit the SI info at this rate */

  186. #define SDT_RETRANS_TIME 500

  187. #define PAT_RETRANS_TIME 100

  188. #define PCR_RETRANS_TIME 20

  189. 

  190. typedef struct MpegTSWriteStream {

  191.     struct MpegTSService *service;

  192.     int pid; /* stream associated pid */

  193.     int cc;

  194.     int payload_size;

  195.     int first_pts_check; ///< first pts check needed

  196.     int64_t payload_pts;

  197.     int64_t payload_dts;

  198.     int payload_flags;

  199.     uint8_t *payload;

  200.     AVFormatContext *amux;

  201.     AVRational user_tb;

  202. } MpegTSWriteStream;

  203. 

  204. static void mpegts_write_pat(AVFormatContext *s)

  205. {

  206.     MpegTSWrite *ts = s->priv_data;

  207.     MpegTSService *service;

  208.     uint8_t data[SECTION_LENGTH], *q;

  209.     int i;

  210. 

  211.     q = data;

  212.     for(i = 0; i < ts->nb_services; i++) {

  213.         service = ts->services[i];

  214.         put16(&q, service->sid);

  215.         put16(&q, 0xe000 | service->pmt.pid);

  216.     }

  217.     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,

  218.                           data, q - data);

  219. }

  220. 

  221. static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)

  222. {

  223.     MpegTSWrite *ts = s->priv_data;

  224.     uint8_t data[SECTION_LENGTH], *q, *desc_length_ptr, *program_info_length_ptr;

  225.     int val, stream_type, i;

  226. 

  227.     q = data;

  228.     put16(&q, 0xe000 | service->pcr_pid);

  229. 

  230.     program_info_length_ptr = q;

  231.     q += 2; /* patched after */

  232. 

  233.     /* put program info here */

  234. 

  235.     val = 0xf000 | (q - program_info_length_ptr - 2);

  236.     program_info_length_ptr[0] = val >> 8;

  237.     program_info_length_ptr[1] = val;

  238. 

  239.     for(i = 0; i < s->nb_streams; i++) {

  240.         AVStream *st = s->streams[i];

  241.         MpegTSWriteStream *ts_st = st->priv_data;

  242.         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);

  243.         switch(st->codec->codec_id) {

  244.         case AV_CODEC_ID_MPEG1VIDEO:

  245.         case AV_CODEC_ID_MPEG2VIDEO:

  246.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  247.             break;

  248.         case AV_CODEC_ID_MPEG4:

  249.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  250.             break;

  251.         case AV_CODEC_ID_H264:

  252.             stream_type = STREAM_TYPE_VIDEO_H264;

  253.             break;

  254.         case AV_CODEC_ID_HEVC:

  255.             stream_type = STREAM_TYPE_VIDEO_HEVC;

  256.             break;

  257.         case AV_CODEC_ID_CAVS:

  258.             stream_type = STREAM_TYPE_VIDEO_CAVS;

  259.             break;

  260.         case AV_CODEC_ID_DIRAC:

  261.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  262.             break;

  263.         case AV_CODEC_ID_MP2:

  264.         case AV_CODEC_ID_MP3:

  265.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  266.             break;

  267.         case AV_CODEC_ID_AAC:

  268.             stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;

  269.             break;

  270.         case AV_CODEC_ID_AAC_LATM:

  271.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  272.             break;

  273.         case AV_CODEC_ID_AC3:

  274.             stream_type = STREAM_TYPE_AUDIO_AC3;

  275.             break;

  276.         default:

  277.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  278.             break;

  279.         }

  280.         *q++ = stream_type;

  281.         put16(&q, 0xe000 | ts_st->pid);

  282.         desc_length_ptr = q;

  283.         q += 2; /* patched after */

  284. 

  285.         /* write optional descriptors here */

  286.         switch(st->codec->codec_type) {

  287.         case AVMEDIA_TYPE_AUDIO:

  288.             if (lang) {

  289.                 char *p;

  290.                 char *next = lang->value;

  291.                 uint8_t *len_ptr;

  292. 

  293.                 *q++ = 0x0a; /* ISO 639 language descriptor */

  294.                 len_ptr = q++;

  295.                 *len_ptr = 0;

  296. 

  297.                 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {

  298.                     next = strchr(p, ',');

  299.                     if (strlen(p) != 3 && (!next || next != p + 3))

  300.                         continue; /* not a 3-letter code */

  301. 

  302.                     *q++ = *p++;

  303.                     *q++ = *p++;

  304.                     *q++ = *p++;

  305. 

  306.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  307.                     *q++ = 0x01;

  308.                 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)

  309.                     *q++ = 0x02;

  310.                 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)

  311.                     *q++ = 0x03;

  312.                 else

  313.                     *q++ = 0; /* undefined type */

  314. 

  315.                     *len_ptr += 4;

  316.                 }

  317. 

  318.                 if (*len_ptr == 0)

  319.                     q -= 2; /* no language codes were written */

  320.             }

  321.             break;

  322.         case AVMEDIA_TYPE_SUBTITLE:

  323.             {

  324.                 const char *language;

  325.                 language = lang && strlen(lang->value)==3 ? lang->value : "eng";

  326.                 *q++ = 0x59;

  327.                 *q++ = 8;

  328.                 *q++ = language[0];

  329.                 *q++ = language[1];

  330.                 *q++ = language[2];

  331.                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */

  332.                 if(st->codec->extradata_size == 4) {

  333.                     memcpy(q, st->codec->extradata, 4);

  334.                     q += 4;

  335.                 } else {

  336.                     put16(&q, 1); /* page id */

  337.                     put16(&q, 1); /* ancillary page id */

  338.                 }

  339.             }

  340.             break;

  341.         case AVMEDIA_TYPE_VIDEO:

  342.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

  343.                 *q++ = 0x05; /*MPEG-2 registration descriptor*/

  344.                 *q++ = 4;

  345.                 *q++ = 'd';

  346.                 *q++ = 'r';

  347.                 *q++ = 'a';

  348.                 *q++ = 'c';

  349.             }

  350.             break;

  351.         }

  352. 

  353.         val = 0xf000 | (q - desc_length_ptr - 2);

  354.         desc_length_ptr[0] = val >> 8;

  355.         desc_length_ptr[1] = val;

  356.     }

  357.     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,

  358.                           data, q - data);

  359. }

  360. 

  361. /* NOTE: str == NULL is accepted for an empty string */

  362. static void putstr8(uint8_t **q_ptr, const char *str)

  363. {

  364.     uint8_t *q;

  365.     int len;

  366. 

  367.     q = *q_ptr;

  368.     if (!str)

  369.         len = 0;

  370.     else

  371.         len = strlen(str);

  372.     *q++ = len;

  373.     memcpy(q, str, len);

  374.     q += len;

  375.     *q_ptr = q;

  376. }

  377. 

  378. static void mpegts_write_sdt(AVFormatContext *s)

  379. {

  380.     MpegTSWrite *ts = s->priv_data;

  381.     MpegTSService *service;

  382.     uint8_t data[SECTION_LENGTH], *q, *desc_list_len_ptr, *desc_len_ptr;

  383.     int i, running_status, free_ca_mode, val;

  384. 

  385.     q = data;

  386.     put16(&q, ts->onid);

  387.     *q++ = 0xff;

  388.     for(i = 0; i < ts->nb_services; i++) {

  389.         service = ts->services[i];

  390.         put16(&q, service->sid);

  391.         *q++ = 0xfc | 0x00; /* currently no EIT info */

  392.         desc_list_len_ptr = q;

  393.         q += 2;

  394.         running_status = 4; /* running */

  395.         free_ca_mode = 0;

  396. 

  397.         /* write only one descriptor for the service name and provider */

  398.         *q++ = 0x48;

  399.         desc_len_ptr = q;

  400.         q++;

  401.         *q++ = 0x01; /* digital television service */

  402.         putstr8(&q, service->provider_name);

  403.         putstr8(&q, service->name);

  404.         desc_len_ptr[0] = q - desc_len_ptr - 1;

  405. 

  406.         /* fill descriptor length */

  407.         val = (running_status << 13) | (free_ca_mode << 12) |

  408.             (q - desc_list_len_ptr - 2);

  409.         desc_list_len_ptr[0] = val >> 8;

  410.         desc_list_len_ptr[1] = val;

  411.     }

  412.     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,

  413.                           data, q - data);

  414. }

  415. 

  416. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  417.                                          int sid,

  418.                                          const char *provider_name,

  419.                                          const char *name)

  420. {

  421.     MpegTSService *service;

  422. 

  423.     service = av_mallocz(sizeof(MpegTSService));

  424.     if (!service)

  425.         return NULL;

  426.     service->pmt.pid = ts->pmt_start_pid + ts->nb_services;

  427.     service->sid = sid;

  428.     service->provider_name = av_strdup(provider_name);

  429.     service->name = av_strdup(name);

  430.     service->pcr_pid = 0x1fff;

  431.     dynarray_add(&ts->services, &ts->nb_services, service);

  432.     return service;

  433. }

  434. 

  435. static void section_write_packet(MpegTSSection *s, const uint8_t *packet)

  436. {

  437.     AVFormatContext *ctx = s->opaque;

  438.     avio_write(ctx->pb, packet, TS_PACKET_SIZE);

  439. }

  440. 

  441. static int mpegts_write_header(AVFormatContext *s)

  442. {

  443.     MpegTSWrite *ts = s->priv_data;

  444.     MpegTSWriteStream *ts_st;

  445.     MpegTSService *service;

  446.     AVStream *st, *pcr_st = NULL;

  447.     AVDictionaryEntry *title, *provider;

  448.     int i, j;

  449.     const char *service_name;

  450.     const char *provider_name;

  451.     int *pids;

  452.     int ret;

  453. 

  454.     if (s->max_delay < 0) /* Not set by the caller */

  455.         s->max_delay = 0;

  456. 

  457.     // round up to a whole number of TS packets

  458.     ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;

  459. 

  460.     ts->tsid = ts->transport_stream_id;

  461.     ts->onid = ts->original_network_id;

  462.     /* allocate a single DVB service */

  463.     title = av_dict_get(s->metadata, "service_name", NULL, 0);

  464.     if (!title)

  465.         title = av_dict_get(s->metadata, "title", NULL, 0);

  466.     service_name = title ? title->value : DEFAULT_SERVICE_NAME;

  467.     provider = av_dict_get(s->metadata, "service_provider", NULL, 0);

  468.     provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;

  469.     service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);

  470.     service->pmt.write_packet = section_write_packet;

  471.     service->pmt.opaque = s;

  472.     service->pmt.cc = 15;

  473. 

  474.     ts->pat.pid = PAT_PID;

  475.     ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write

  476.     ts->pat.write_packet = section_write_packet;

  477.     ts->pat.opaque = s;

  478. 

  479.     ts->sdt.pid = SDT_PID;

  480.     ts->sdt.cc = 15;

  481.     ts->sdt.write_packet = section_write_packet;

  482.     ts->sdt.opaque = s;

  483. 

  484.     pids = av_malloc(s->nb_streams * sizeof(*pids));

  485.     if (!pids)

  486.         return AVERROR(ENOMEM);

  487. 

  488.     /* assign pids to each stream */

  489.     for(i = 0;i < s->nb_streams; i++) {

  490.         st = s->streams[i];

  491. 

  492.         ts_st = av_mallocz(sizeof(MpegTSWriteStream));

  493.         if (!ts_st) {

  494.             ret = AVERROR(ENOMEM);

  495.             goto fail;

  496.         }

  497.         st->priv_data = ts_st;

  498. 

  499.         ts_st->user_tb = st->time_base;

  500.         avpriv_set_pts_info(st, 33, 1, 90000);

  501. 

  502.         ts_st->payload = av_mallocz(ts->pes_payload_size);

  503.         if (!ts_st->payload) {

  504.             ret = AVERROR(ENOMEM);

  505.             goto fail;

  506.         }

  507.         ts_st->service = service;

  508.         /* MPEG pid values < 16 are reserved. Applications which set st->id in

  509.          * this range are assigned a calculated pid. */

  510.         if (st->id < 16) {

  511.             ts_st->pid = ts->start_pid + i;

  512.         } else if (st->id < 0x1FFF) {

  513.             ts_st->pid = st->id;

  514.         } else {

  515.             av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);

  516.             ret = AVERROR(EINVAL);

  517.             goto fail;

  518.         }

  519.         if (ts_st->pid == service->pmt.pid) {

  520.             av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);

  521.             ret = AVERROR(EINVAL);

  522.             goto fail;

  523.         }

  524.         for (j = 0; j < i; j++)

  525.             if (pids[j] == ts_st->pid) {

  526.                 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);

  527.                 ret = AVERROR(EINVAL);

  528.                 goto fail;

  529.             }

  530.         pids[i] = ts_st->pid;

  531.         ts_st->payload_pts = AV_NOPTS_VALUE;

  532.         ts_st->payload_dts = AV_NOPTS_VALUE;

  533.         ts_st->first_pts_check = 1;

  534.         ts_st->cc = 15;

  535.         /* update PCR pid by using the first video stream */

  536.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

  537.             service->pcr_pid == 0x1fff) {

  538.             service->pcr_pid = ts_st->pid;

  539.             pcr_st = st;

  540.         }

  541.         if (st->codec->codec_id == AV_CODEC_ID_AAC &&

  542.             st->codec->extradata_size > 0)

  543.         {

  544.             AVStream *ast;

  545.             ts_st->amux = avformat_alloc_context();

  546.             if (!ts_st->amux) {

  547.                 ret = AVERROR(ENOMEM);

  548.                 goto fail;

  549.             }

  550.             ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);

  551.             if (!ts_st->amux->oformat) {

  552.                 ret = AVERROR(EINVAL);

  553.                 goto fail;

  554.             }

  555.             ast = avformat_new_stream(ts_st->amux, NULL);

  556.             ret = avcodec_copy_context(ast->codec, st->codec);

  557.             if (ret != 0)

  558.                 goto fail;

  559.             ret = avformat_write_header(ts_st->amux, NULL);

  560.             if (ret < 0)

  561.                 goto fail;

  562.         }

  563.     }

  564. 

  565.     av_free(pids);

  566. 

  567.     /* if no video stream, use the first stream as PCR */

  568.     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {

  569.         pcr_st = s->streams[0];

  570.         ts_st = pcr_st->priv_data;

  571.         service->pcr_pid = ts_st->pid;

  572.     } else

  573.         ts_st = pcr_st->priv_data;

  574. 

  575.     if (ts->mux_rate > 1) {

  576.         service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /

  577.             (TS_PACKET_SIZE * 8 * 1000);

  578.         ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /

  579.             (TS_PACKET_SIZE * 8 * 1000);

  580.         ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /

  581.             (TS_PACKET_SIZE * 8 * 1000);

  582. 

  583.         ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);

  584.     } else {

  585.         /* Arbitrary values, PAT/PMT could be written on key frames */

  586.         ts->sdt_packet_period = 200;

  587.         ts->pat_packet_period = 40;

  588.         if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  589.             if (!pcr_st->codec->frame_size) {

  590.                 av_log(s, AV_LOG_WARNING, "frame size not set\n");

  591.                 service->pcr_packet_period =

  592.                     pcr_st->codec->sample_rate/(10*512);

  593.             } else {

  594.                 service->pcr_packet_period =

  595.                     pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);

  596.             }

  597.         } else {

  598.             // max delta PCR 0.1s

  599.             // TODO: should be avg_frame_rate

  600.             service->pcr_packet_period =

  601.                 ts_st->user_tb.den / (10 * ts_st->user_tb.num);

  602.         }

  603.     }

  604. 

  605.     // output a PCR as soon as possible

  606.     service->pcr_packet_count = service->pcr_packet_period;

  607.     ts->pat_packet_count = ts->pat_packet_period-1;

  608.     ts->sdt_packet_count = ts->sdt_packet_period-1;

  609. 

  610.     if (ts->mux_rate == 1)

  611.         av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");

  612.     else

  613.         av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);

  614.     av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "

  615.            "sdt every %d, pat/pmt every %d pkts\n",

  616.            service->pcr_packet_period,

  617.            ts->sdt_packet_period, ts->pat_packet_period);

  618. 

  619.     avio_flush(s->pb);

  620. 

  621.     return 0;

  622. 

  623.  fail:

  624.     av_free(pids);

  625.     for(i = 0;i < s->nb_streams; i++) {

  626.         MpegTSWriteStream *ts_st;

  627.         st = s->streams[i];

  628.         ts_st = st->priv_data;

  629.         if (ts_st) {

  630.             av_freep(&ts_st->payload);

  631.             if (ts_st->amux) {

  632.                 avformat_free_context(ts_st->amux);

  633.                 ts_st->amux = NULL;

  634.             }

  635.         }

  636.         av_freep(&st->priv_data);

  637.     }

  638.     return ret;

  639. }

  640. 

  641. /* send SDT, PAT and PMT tables regulary */

  642. static void retransmit_si_info(AVFormatContext *s)

  643. {

  644.     MpegTSWrite *ts = s->priv_data;

  645.     int i;

  646. 

  647.     if (++ts->sdt_packet_count == ts->sdt_packet_period) {

  648.         ts->sdt_packet_count = 0;

  649.         mpegts_write_sdt(s);

  650.     }

  651.     if (++ts->pat_packet_count == ts->pat_packet_period) {

  652.         ts->pat_packet_count = 0;

  653.         mpegts_write_pat(s);

  654.         for(i = 0; i < ts->nb_services; i++) {

  655.             mpegts_write_pmt(s, ts->services[i]);

  656.         }

  657.     }

  658. }

  659. 

  660. static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)

  661. {

  662.     return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +

  663.            ts->first_pcr;

  664. }

  665. 

  666. static int write_pcr_bits(uint8_t *buf, int64_t pcr)

  667. {

  668.     int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;

  669. 

  670.     *buf++ = pcr_high >> 25;

  671.     *buf++ = pcr_high >> 17;

  672.     *buf++ = pcr_high >> 9;

  673.     *buf++ = pcr_high >> 1;

  674.     *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;

  675.     *buf++ = pcr_low;

  676. 

  677.     return 6;

  678. }

  679. 

  680. /* Write a single null transport stream packet */

  681. static void mpegts_insert_null_packet(AVFormatContext *s)

  682. {

  683.     uint8_t *q;

  684.     uint8_t buf[TS_PACKET_SIZE];

  685. 

  686.     q = buf;

  687.     *q++ = 0x47;

  688.     *q++ = 0x00 | 0x1f;

  689.     *q++ = 0xff;

  690.     *q++ = 0x10;

  691.     memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));

  692.     avio_write(s->pb, buf, TS_PACKET_SIZE);

  693. }

  694. 

  695. /* Write a single transport stream packet with a PCR and no payload */

  696. static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)

  697. {

  698.     MpegTSWrite *ts = s->priv_data;

  699.     MpegTSWriteStream *ts_st = st->priv_data;

  700.     uint8_t *q;

  701.     uint8_t buf[TS_PACKET_SIZE];

  702. 

  703.     q = buf;

  704.     *q++ = 0x47;

  705.     *q++ = ts_st->pid >> 8;

  706.     *q++ = ts_st->pid;

  707.     *q++ = 0x20 | ts_st->cc;   /* Adaptation only */

  708.     /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */

  709.     *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */

  710.     *q++ = 0x10;               /* Adaptation flags: PCR present */

  711. 

  712.     /* PCR coded into 6 bytes */

  713.     q += write_pcr_bits(q, get_pcr(ts, s->pb));

  714. 

  715.     /* stuffing bytes */

  716.     memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));

  717.     avio_write(s->pb, buf, TS_PACKET_SIZE);

  718. }

  719. 

  720. static void write_pts(uint8_t *q, int fourbits, int64_t pts)

  721. {

  722.     int val;

  723. 

  724.     val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;

  725.     *q++ = val;

  726.     val = (((pts >> 15) & 0x7fff) << 1) | 1;

  727.     *q++ = val >> 8;

  728.     *q++ = val;

  729.     val = (((pts) & 0x7fff) << 1) | 1;

  730.     *q++ = val >> 8;

  731.     *q++ = val;

  732. }

  733. 

  734. /* Set an adaptation field flag in an MPEG-TS packet*/

  735. static void set_af_flag(uint8_t *pkt, int flag)

  736. {

  737.     // expect at least one flag to set

  738.     assert(flag);

  739. 

  740.     if ((pkt[3] & 0x20) == 0) {

  741.         // no AF yet, set adaptation field flag

  742.         pkt[3] |= 0x20;

  743.         // 1 byte length, no flags

  744.         pkt[4] = 1;

  745.         pkt[5] = 0;

  746.     }

  747.     pkt[5] |= flag;

  748. }

  749. 

  750. /* Extend the adaptation field by size bytes */

  751. static void extend_af(uint8_t *pkt, int size)

  752. {

  753.     // expect already existing adaptation field

  754.     assert(pkt[3] & 0x20);

  755.     pkt[4] += size;

  756. }

  757. 

  758. /* Get a pointer to MPEG-TS payload (right after TS packet header) */

  759. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  760. {

  761.     if (pkt[3] & 0x20)

  762.         return pkt + 5 + pkt[4];

  763.     else

  764.         return pkt + 4;

  765. }

  766. 

  767. /* Add a pes header to the front of payload, and segment into an integer number of

  768.  * ts packets. The final ts packet is padded using an over-sized adaptation header

  769.  * to exactly fill the last ts packet.

  770.  * NOTE: 'payload' contains a complete PES payload.

  771.  */

  772. static void mpegts_write_pes(AVFormatContext *s, AVStream *st,

  773.                              const uint8_t *payload, int payload_size,

  774.                              int64_t pts, int64_t dts, int key)

  775. {

  776.     MpegTSWriteStream *ts_st = st->priv_data;

  777.     MpegTSWrite *ts = s->priv_data;

  778.     uint8_t buf[TS_PACKET_SIZE];

  779.     uint8_t *q;

  780.     int val, is_start, len, header_len, write_pcr, private_code, flags;

  781.     int afc_len, stuffing_len;

  782.     int64_t pcr = -1; /* avoid warning */

  783.     int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);

  784. 

  785.     is_start = 1;

  786.     while (payload_size > 0) {

  787.         retransmit_si_info(s);

  788. 

  789.         write_pcr = 0;

  790.         if (ts_st->pid == ts_st->service->pcr_pid) {

  791.             if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames

  792.                 ts_st->service->pcr_packet_count++;

  793.             if (ts_st->service->pcr_packet_count >=

  794.                 ts_st->service->pcr_packet_period) {

  795.                 ts_st->service->pcr_packet_count = 0;

  796.                 write_pcr = 1;

  797.             }

  798.         }

  799. 

  800.         if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&

  801.             (dts - get_pcr(ts, s->pb)/300) > delay) {

  802.             /* pcr insert gets priority over null packet insert */

  803.             if (write_pcr)

  804.                 mpegts_insert_pcr_only(s, st);

  805.             else

  806.                 mpegts_insert_null_packet(s);

  807.             continue; /* recalculate write_pcr and possibly retransmit si_info */

  808.         }

  809. 

  810.         /* prepare packet header */

  811.         q = buf;

  812.         *q++ = 0x47;

  813.         val = (ts_st->pid >> 8);

  814.         if (is_start)

  815.             val |= 0x40;

  816.         *q++ = val;

  817.         *q++ = ts_st->pid;

  818.         ts_st->cc = (ts_st->cc + 1) & 0xf;

  819.         *q++ = 0x10 | ts_st->cc; // payload indicator + CC

  820.         if (key && is_start && pts != AV_NOPTS_VALUE) {

  821.             // set Random Access for key frames

  822.             if (ts_st->pid == ts_st->service->pcr_pid)

  823.                 write_pcr = 1;

  824.             set_af_flag(buf, 0x40);

  825.             q = get_ts_payload_start(buf);

  826.         }

  827.         if (write_pcr) {

  828.             set_af_flag(buf, 0x10);

  829.             q = get_ts_payload_start(buf);

  830.             // add 11, pcr references the last byte of program clock reference base

  831.             if (ts->mux_rate > 1)

  832.                 pcr = get_pcr(ts, s->pb);

  833.             else

  834.                 pcr = (dts - delay)*300;

  835.             if (dts != AV_NOPTS_VALUE && dts < pcr / 300)

  836.                 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");

  837.             extend_af(buf, write_pcr_bits(q, pcr));

  838.             q = get_ts_payload_start(buf);

  839.         }

  840.         if (is_start) {

  841.             int pes_extension = 0;

  842.             /* write PES header */

  843.             *q++ = 0x00;

  844.             *q++ = 0x00;

  845.             *q++ = 0x01;

  846.             private_code = 0;

  847.             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  848.                 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {

  849.                     *q++ = 0xfd;

  850.                 } else

  851.                     *q++ = 0xe0;

  852.             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  853.                        (st->codec->codec_id == AV_CODEC_ID_MP2 ||

  854.                         st->codec->codec_id == AV_CODEC_ID_MP3 ||

  855.                         st->codec->codec_id == AV_CODEC_ID_AAC)) {

  856.                 *q++ = 0xc0;

  857.             } else {

  858.                 *q++ = 0xbd;

  859.                 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {

  860.                     private_code = 0x20;

  861.                 }

  862.             }

  863.             header_len = 0;

  864.             flags = 0;

  865.             if (pts != AV_NOPTS_VALUE) {

  866.                 header_len += 5;

  867.                 flags |= 0x80;

  868.             }

  869.             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {

  870.                 header_len += 5;

  871.                 flags |= 0x40;

  872.             }

  873.             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

  874.                 st->codec->codec_id == AV_CODEC_ID_DIRAC) {

  875.                 /* set PES_extension_flag */

  876.                 pes_extension = 1;

  877.                 flags |= 0x01;

  878. 

  879.                 /*

  880.                 * One byte for PES2 extension flag +

  881.                 * one byte for extension length +

  882.                 * one byte for extension id

  883.                 */

  884.                 header_len += 3;

  885.             }

  886.             len = payload_size + header_len + 3;

  887.             if (private_code != 0)

  888.                 len++;

  889.             if (len > 0xffff)

  890.                 len = 0;

  891.             *q++ = len >> 8;

  892.             *q++ = len;

  893.             val = 0x80;

  894.             /* data alignment indicator is required for subtitle data */

  895.             if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)

  896.                 val |= 0x04;

  897.             *q++ = val;

  898.             *q++ = flags;

  899.             *q++ = header_len;

  900.             if (pts != AV_NOPTS_VALUE) {

  901.                 write_pts(q, flags >> 6, pts);

  902.                 q += 5;

  903.             }

  904.             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {

  905.                 write_pts(q, 1, dts);

  906.                 q += 5;

  907.             }

  908.             if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {

  909.                 flags = 0x01;  /* set PES_extension_flag_2 */

  910.                 *q++ = flags;

  911.                 *q++ = 0x80 | 0x01;  /* marker bit + extension length */

  912.                 /*

  913.                 * Set the stream id extension flag bit to 0 and

  914.                 * write the extended stream id

  915.                 */

  916.                 *q++ = 0x00 | 0x60;

  917.             }

  918.             if (private_code != 0)

  919.                 *q++ = private_code;

  920.             is_start = 0;

  921.         }

  922.         /* header size */

  923.         header_len = q - buf;

  924.         /* data len */

  925.         len = TS_PACKET_SIZE - header_len;

  926.         if (len > payload_size)

  927.             len = payload_size;

  928.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  929.         if (stuffing_len > 0) {

  930.             /* add stuffing with AFC */

  931.             if (buf[3] & 0x20) {

  932.                 /* stuffing already present: increase its size */

  933.                 afc_len = buf[4] + 1;

  934.                 memmove(buf + 4 + afc_len + stuffing_len,

  935.                         buf + 4 + afc_len,

  936.                         header_len - (4 + afc_len));

  937.                 buf[4] += stuffing_len;

  938.                 memset(buf + 4 + afc_len, 0xff, stuffing_len);

  939.             } else {

  940.                 /* add stuffing */

  941.                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);

  942.                 buf[3] |= 0x20;

  943.                 buf[4] = stuffing_len - 1;

  944.                 if (stuffing_len >= 2) {

  945.                     buf[5] = 0x00;

  946.                     memset(buf + 6, 0xff, stuffing_len - 2);

  947.                 }

  948.             }

  949.         }

  950.         memcpy(buf + TS_PACKET_SIZE - len, payload, len);

  951.         payload += len;

  952.         payload_size -= len;

  953.         avio_write(s->pb, buf, TS_PACKET_SIZE);

  954.     }

  955.     avio_flush(s->pb);

  956. }

  957. 

  958. static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)

  959. {

  960.     AVStream *st = s->streams[pkt->stream_index];

  961.     int size = pkt->size;

  962.     uint8_t *buf= pkt->data;

  963.     uint8_t *data= NULL;

  964.     MpegTSWrite *ts = s->priv_data;

  965.     MpegTSWriteStream *ts_st = st->priv_data;

  966.     const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;

  967.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  968. 

  969.     if (ts->reemit_pat_pmt) {

  970.         av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");

  971.         ts->reemit_pat_pmt = 0;

  972.         ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;

  973.     }

  974. 

  975.     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {

  976.         ts->pat_packet_count = ts->pat_packet_period - 1;

  977.         ts->sdt_packet_count = ts->sdt_packet_period - 1;

  978.         ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;

  979.     }

  980. 

  981.     if (pkt->pts != AV_NOPTS_VALUE)

  982.         pts = pkt->pts + delay;

  983.     if (pkt->dts != AV_NOPTS_VALUE)

  984.         dts = pkt->dts + delay;

  985. 

  986.     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {

  987.         av_log(s, AV_LOG_ERROR, "first pts value must set\n");

  988.         return AVERROR(EINVAL);

  989.     }

  990.     ts_st->first_pts_check = 0;

  991. 

  992.     if (st->codec->codec_id == AV_CODEC_ID_H264) {

  993.         const uint8_t *p = buf, *buf_end = p+size;

  994.         uint32_t state = -1;

  995. 

  996.         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {

  997.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "

  998.                    "no startcode found, use -bsf h264_mp4toannexb\n");

  999.             return AVERROR(EINVAL);

  1000.         }

  1001. 

  1002.         do {

  1003.             p = avpriv_find_start_code(p, buf_end, &state);

  1004.             av_dlog(s, "nal %d\n", state & 0x1f);

  1005.         } while (p < buf_end && (state & 0x1f) != 9 &&

  1006.                  (state & 0x1f) != 5 && (state & 0x1f) != 1);

  1007. 

  1008.         if ((state & 0x1f) != 9) { // AUD NAL

  1009.             data = av_malloc(pkt->size+6);

  1010.             if (!data)

  1011.                 return AVERROR(ENOMEM);

  1012.             memcpy(data+6, pkt->data, pkt->size);

  1013.             AV_WB32(data, 0x00000001);

  1014.             data[4] = 0x09;

  1015.             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit

  1016.             buf  = data;

  1017.             size = pkt->size+6;

  1018.         }

  1019.     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {

  1020.         if (pkt->size < 2) {

  1021.             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");

  1022.             return AVERROR(EINVAL);

  1023.         }

  1024.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {

  1025.             int ret;

  1026.             AVPacket pkt2;

  1027. 

  1028.             if (!ts_st->amux) {

  1029.                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "

  1030.                        "and extradata missing\n");

  1031.                 return AVERROR(EINVAL);

  1032.             }

  1033. 

  1034.             av_init_packet(&pkt2);

  1035.             pkt2.data = pkt->data;

  1036.             pkt2.size = pkt->size;

  1037.             ret = avio_open_dyn_buf(&ts_st->amux->pb);

  1038.             if (ret < 0)

  1039.                 return AVERROR(ENOMEM);

  1040. 

  1041.             ret = av_write_frame(ts_st->amux, &pkt2);

  1042.             if (ret < 0) {

  1043.                 avio_close_dyn_buf(ts_st->amux->pb, &data);

  1044.                 ts_st->amux->pb = NULL;

  1045.                 av_free(data);

  1046.                 return ret;

  1047.             }

  1048.             size = avio_close_dyn_buf(ts_st->amux->pb, &data);

  1049.             ts_st->amux->pb = NULL;

  1050.             buf = data;

  1051.         }

  1052.     }

  1053. 

  1054.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  1055.         // for video and subtitle, write a single pes packet

  1056.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1057.         av_free(data);

  1058.         return 0;

  1059.     }

  1060. 

  1061.     if (ts_st->payload_size + size > ts->pes_payload_size) {

  1062.         if (ts_st->payload_size) {

  1063.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1064.                              ts_st->payload_pts, ts_st->payload_dts,

  1065.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1066.             ts_st->payload_size = 0;

  1067.         }

  1068.         if (size > ts->pes_payload_size) {

  1069.             mpegts_write_pes(s, st, buf, size, pts, dts,

  1070.                              pkt->flags & AV_PKT_FLAG_KEY);

  1071.             av_free(data);

  1072.             return 0;

  1073.         }

  1074.     }

  1075. 

  1076.     if (!ts_st->payload_size) {

  1077.         ts_st->payload_pts = pts;

  1078.         ts_st->payload_dts = dts;

  1079.         ts_st->payload_flags = pkt->flags;

  1080.     }

  1081. 

  1082.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1083.     ts_st->payload_size += size;

  1084. 

  1085.     av_free(data);

  1086. 

  1087.     return 0;

  1088. }

  1089. 

  1090. static void mpegts_write_flush(AVFormatContext *s)

  1091. {

  1092.     int i;

  1093. 

  1094.     /* flush current packets */

  1095.     for(i = 0; i < s->nb_streams; i++) {

  1096.         AVStream *st = s->streams[i];

  1097.         MpegTSWriteStream *ts_st = st->priv_data;

  1098.         if (ts_st->payload_size > 0) {

  1099.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1100.                              ts_st->payload_pts, ts_st->payload_dts,

  1101.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1102.             ts_st->payload_size = 0;

  1103.         }

  1104.     }

  1105.     avio_flush(s->pb);

  1106. }

  1107. 

  1108. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)

  1109. {

  1110.     if (!pkt) {

  1111.         mpegts_write_flush(s);

  1112.         return 1;

  1113.     } else {

  1114.         return mpegts_write_packet_internal(s, pkt);

  1115.     }

  1116. }

  1117. 

  1118. static int mpegts_write_end(AVFormatContext *s)

  1119. {

  1120.     MpegTSWrite *ts = s->priv_data;

  1121.     MpegTSService *service;

  1122.     int i;

  1123. 

  1124.     mpegts_write_flush(s);

  1125. 

  1126.     for(i = 0; i < s->nb_streams; i++) {

  1127.         AVStream *st = s->streams[i];

  1128.         MpegTSWriteStream *ts_st = st->priv_data;

  1129.         av_freep(&ts_st->payload);

  1130.         if (ts_st->amux) {

  1131.             avformat_free_context(ts_st->amux);

  1132.             ts_st->amux = NULL;

  1133.         }

  1134.     }

  1135. 

  1136.     for(i = 0; i < ts->nb_services; i++) {

  1137.         service = ts->services[i];

  1138.         av_freep(&service->provider_name);

  1139.         av_freep(&service->name);

  1140.         av_free(service);

  1141.     }

  1142.     av_free(ts->services);

  1143. 

  1144.     return 0;

  1145. }

  1146. 

  1147. static const AVOption options[] = {

  1148.     { "mpegts_transport_stream_id", "Set transport_stream_id field.",

  1149.       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

  1150.     { "mpegts_original_network_id", "Set original_network_id field.",

  1151.       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

  1152.     { "mpegts_service_id", "Set service_id field.",

  1153.       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

  1154.     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",

  1155.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

  1156.     { "mpegts_start_pid", "Set the first pid.",

  1157.       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},

  1158.     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  1159.     { "pes_payload_size", "Minimum PES packet payload in bytes",

  1160.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  1161.     { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,

  1162.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

  1163.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",

  1164.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,

  1165.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},

  1166.     { "latm", "Use LATM packetization for AAC",

  1167.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,

  1168.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},

  1169.     // backward compatibility

  1170.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",

  1171.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  1172.     { "pcr_period", "PCR retransmission time",

  1173.       offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT, { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

  1174.     { NULL },

  1175. };

  1176. 

  1177. static const AVClass mpegts_muxer_class = {

  1178.     .class_name     = "MPEGTS muxer",

  1179.     .item_name      = av_default_item_name,

  1180.     .option         = options,

  1181.     .version        = LIBAVUTIL_VERSION_INT,

  1182. };

  1183. 

  1184. AVOutputFormat ff_mpegts_muxer = {

  1185.     .name              = "mpegts",

  1186.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),

  1187.     .mime_type         = "video/x-mpegts",

  1188.     .extensions        = "ts,m2t",

  1189.     .priv_data_size    = sizeof(MpegTSWrite),

  1190.     .audio_codec       = AV_CODEC_ID_MP2,

  1191.     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,

  1192.     .write_header      = mpegts_write_header,

  1193.     .write_packet      = mpegts_write_packet,

  1194.     .write_trailer     = mpegts_write_end,

  1195.     .flags             = AVFMT_ALLOW_FLUSH,

  1196.     .priv_class        = &mpegts_muxer_class,

  1197. };