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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/mathematics.h"

  26. #include "libavutil/opt.h"

  27. #include "libavcodec/mpegvideo.h"

  28. #include "avformat.h"

  29. #include "internal.h"

  30. #include "mpegts.h"

  31. #include "adts.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;

  81. } MpegTSWrite;

  82. 

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

  84. #define DEFAULT_PES_HEADER_FREQ 16

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

  86. 

  87. static const AVOption options[] = {

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

  89.       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  91.       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  93.       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  95.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

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

  97.       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},

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

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

  100.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

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

  102.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  103.     { NULL },

  104. };

  105. 

  106. static const AVClass mpegts_muxer_class = {

  107.     .class_name     = "MPEGTS muxer",

  108.     .item_name      = av_default_item_name,

  109.     .option         = options,

  110.     .version        = LIBAVUTIL_VERSION_INT,

  111. };

  112. 

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

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

  115. {

  116.     unsigned int crc;

  117.     unsigned char packet[TS_PACKET_SIZE];

  118.     const unsigned char *buf_ptr;

  119.     unsigned char *q;

  120.     int first, b, len1, left;

  121. 

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

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

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

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

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

  127. 

  128.     /* send each packet */

  129.     buf_ptr = buf;

  130.     while (len > 0) {

  131.         first = (buf == buf_ptr);

  132.         q = packet;

  133.         *q++ = 0x47;

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

  135.         if (first)

  136.             b |= 0x40;

  137.         *q++ = b;

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

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

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

  141.         if (first)

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

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

  144.         if (len1 > len)

  145.             len1 = len;

  146.         memcpy(q, buf_ptr, len1);

  147.         q += len1;

  148.         /* add known padding data */

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

  150.         if (left > 0)

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

  152. 

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

  154. 

  155.         buf_ptr += len1;

  156.         len -= len1;

  157.     }

  158. }

  159. 

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

  161. {

  162.     uint8_t *q;

  163.     q = *q_ptr;

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

  165.     *q++ = val;

  166.     *q_ptr = q;

  167. }

  168. 

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

  170.                           int version, int sec_num, int last_sec_num,

  171.                           uint8_t *buf, int len)

  172. {

  173.     uint8_t section[1024], *q;

  174.     unsigned int tot_len;

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

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

  177. 

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

  179.     /* check if not too big */

  180.     if (tot_len > 1024)

  181.         return -1;

  182. 

  183.     q = section;

  184.     *q++ = tid;

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

  186.     put16(&q, id);

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

  188.     *q++ = sec_num;

  189.     *q++ = last_sec_num;

  190.     memcpy(q, buf, len);

  191. 

  192.     mpegts_write_section(s, section, tot_len);

  193.     return 0;

  194. }

  195. 

  196. /*********************************************/

  197. /* mpegts writer */

  198. 

  199. #define DEFAULT_PROVIDER_NAME   "Libav"

  200. #define DEFAULT_SERVICE_NAME    "Service01"

  201. 

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

  203. #define SDT_RETRANS_TIME 500

  204. #define PAT_RETRANS_TIME 100

  205. #define PCR_RETRANS_TIME 20

  206. 

  207. typedef struct MpegTSWriteStream {

  208.     struct MpegTSService *service;

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

  210.     int cc;

  211.     int payload_size;

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

  213.     int64_t payload_pts;

  214.     int64_t payload_dts;

  215.     int payload_flags;

  216.     uint8_t *payload;

  217.     ADTSContext *adts;

  218. } MpegTSWriteStream;

  219. 

  220. static void mpegts_write_pat(AVFormatContext *s)

  221. {

  222.     MpegTSWrite *ts = s->priv_data;

  223.     MpegTSService *service;

  224.     uint8_t data[1012], *q;

  225.     int i;

  226. 

  227.     q = data;

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

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

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

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

  232.     }

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

  234.                           data, q - data);

  235. }

  236. 

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

  238. {

  239.     //    MpegTSWrite *ts = s->priv_data;

  240.     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;

  241.     int val, stream_type, i;

  242. 

  243.     q = data;

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

  245. 

  246.     program_info_length_ptr = q;

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

  248. 

  249.     /* put program info here */

  250. 

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

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

  253.     program_info_length_ptr[1] = val;

  254. 

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

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

  257.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  260.         case CODEC_ID_MPEG1VIDEO:

  261.         case CODEC_ID_MPEG2VIDEO:

  262.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  263.             break;

  264.         case CODEC_ID_MPEG4:

  265.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  266.             break;

  267.         case CODEC_ID_H264:

  268.             stream_type = STREAM_TYPE_VIDEO_H264;

  269.             break;

  270.         case CODEC_ID_DIRAC:

  271.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  272.             break;

  273.         case CODEC_ID_MP2:

  274.         case CODEC_ID_MP3:

  275.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  276.             break;

  277.         case CODEC_ID_AAC:

  278.             stream_type = STREAM_TYPE_AUDIO_AAC;

  279.             break;

  280.         case CODEC_ID_AAC_LATM:

  281.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  282.             break;

  283.         case CODEC_ID_AC3:

  284.             stream_type = STREAM_TYPE_AUDIO_AC3;

  285.             break;

  286.         default:

  287.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  288.             break;

  289.         }

  290.         *q++ = stream_type;

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

  292.         desc_length_ptr = q;

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

  294. 

  295.         /* write optional descriptors here */

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

  297.         case AVMEDIA_TYPE_AUDIO:

  298.             if (lang) {

  299.                 char *p;

  300.                 char *next = lang->value;

  301.                 uint8_t *len_ptr;

  302. 

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

  304.                 len_ptr = q++;

  305.                 *len_ptr = 0;

  306. 

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

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

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

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

  311. 

  312.                     *q++ = *p++;

  313.                     *q++ = *p++;

  314.                     *q++ = *p++;

  315. 

  316.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  317.                     *q++ = 0x01;

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

  319.                     *q++ = 0x02;

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

  321.                     *q++ = 0x03;

  322.                 else

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

  324. 

  325.                     *len_ptr += 4;

  326.                 }

  327. 

  328.                 if (*len_ptr == 0)

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

  330.             }

  331.             break;

  332.         case AVMEDIA_TYPE_SUBTITLE:

  333.             {

  334.                 const char *language;

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

  336.                 *q++ = 0x59;

  337.                 *q++ = 8;

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

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

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

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

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

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

  344.                     q += 4;

  345.                 } else {

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

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

  348.                 }

  349.             }

  350.             break;

  351.         case AVMEDIA_TYPE_VIDEO:

  352.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  354.                 *q++ = 4;

  355.                 *q++ = 'd';

  356.                 *q++ = 'r';

  357.                 *q++ = 'a';

  358.                 *q++ = 'c';

  359.             }

  360.             break;

  361.         }

  362. 

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

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

  365.         desc_length_ptr[1] = val;

  366.     }

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

  368.                           data, q - data);

  369. }

  370. 

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

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

  373. {

  374.     uint8_t *q;

  375.     int len;

  376. 

  377.     q = *q_ptr;

  378.     if (!str)

  379.         len = 0;

  380.     else

  381.         len = strlen(str);

  382.     *q++ = len;

  383.     memcpy(q, str, len);

  384.     q += len;

  385.     *q_ptr = q;

  386. }

  387. 

  388. static void mpegts_write_sdt(AVFormatContext *s)

  389. {

  390.     MpegTSWrite *ts = s->priv_data;

  391.     MpegTSService *service;

  392.     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;

  393.     int i, running_status, free_ca_mode, val;

  394. 

  395.     q = data;

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

  397.     *q++ = 0xff;

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

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

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

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

  402.         desc_list_len_ptr = q;

  403.         q += 2;

  404.         running_status = 4; /* running */

  405.         free_ca_mode = 0;

  406. 

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

  408.         *q++ = 0x48;

  409.         desc_len_ptr = q;

  410.         q++;

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

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

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

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

  415. 

  416.         /* fill descriptor length */

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

  418.             (q - desc_list_len_ptr - 2);

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

  420.         desc_list_len_ptr[1] = val;

  421.     }

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

  423.                           data, q - data);

  424. }

  425. 

  426. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  427.                                          int sid,

  428.                                          const char *provider_name,

  429.                                          const char *name)

  430. {

  431.     MpegTSService *service;

  432. 

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

  434.     if (!service)

  435.         return NULL;

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

  437.     service->sid = sid;

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

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

  440.     service->pcr_pid = 0x1fff;

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

  442.     return service;

  443. }

  444. 

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

  446. {

  447.     AVFormatContext *ctx = s->opaque;

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

  449. }

  450. 

  451. static int mpegts_write_header(AVFormatContext *s)

  452. {

  453.     MpegTSWrite *ts = s->priv_data;

  454.     MpegTSWriteStream *ts_st;

  455.     MpegTSService *service;

  456.     AVStream *st, *pcr_st = NULL;

  457.     AVDictionaryEntry *title, *provider;

  458.     int i, j;

  459.     const char *service_name;

  460.     const char *provider_name;

  461.     int *pids;

  462. 

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

  464.         s->max_delay = 0;

  465. 

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

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

  468. 

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

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

  471.     /* allocate a single DVB service */

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

  473.     if (!title)

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

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

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

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

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

  479.     service->pmt.write_packet = section_write_packet;

  480.     service->pmt.opaque = s;

  481.     service->pmt.cc = 15;

  482. 

  483.     ts->pat.pid = PAT_PID;

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

  485.     ts->pat.write_packet = section_write_packet;

  486.     ts->pat.opaque = s;

  487. 

  488.     ts->sdt.pid = SDT_PID;

  489.     ts->sdt.cc = 15;

  490.     ts->sdt.write_packet = section_write_packet;

  491.     ts->sdt.opaque = s;

  492. 

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

  494.     if (!pids)

  495.         return AVERROR(ENOMEM);

  496. 

  497.     /* assign pids to each stream */

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

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

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

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

  502.         if (!ts_st)

  503.             goto fail;

  504.         st->priv_data = ts_st;

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

  506.         if (!ts_st->payload)

  507.             goto fail;

  508.         ts_st->service = service;

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

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

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

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

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

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

  515.         } else {

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

  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.             goto fail;

  522.         }

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

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

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

  526.                 goto fail;

  527.             }

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

  529.         ts_st->payload_pts = AV_NOPTS_VALUE;

  530.         ts_st->payload_dts = AV_NOPTS_VALUE;

  531.         ts_st->first_pts_check = 1;

  532.         ts_st->cc = 15;

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

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

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

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

  537.             pcr_st = st;

  538.         }

  539.         if (st->codec->codec_id == CODEC_ID_AAC &&

  540.             st->codec->extradata_size > 0) {

  541.             ts_st->adts = av_mallocz(sizeof(*ts_st->adts));

  542.             if (!ts_st->adts)

  543.                 goto fail;

  544.             if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,

  545.                                          st->codec->extradata_size) < 0)

  546.                 goto fail;

  547.         }

  548.     }

  549. 

  550.     av_free(pids);

  551. 

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

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

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

  555.         ts_st = pcr_st->priv_data;

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

  557.     }

  558. 

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

  560.         service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /

  561.             (TS_PACKET_SIZE * 8 * 1000);

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

  563.             (TS_PACKET_SIZE * 8 * 1000);

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

  565.             (TS_PACKET_SIZE * 8 * 1000);

  566. 

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

  568.     } else {

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

  570.         ts->sdt_packet_period = 200;

  571.         ts->pat_packet_period = 40;

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

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

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

  575.                 service->pcr_packet_period =

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

  577.             } else {

  578.                 service->pcr_packet_period =

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

  580.             }

  581.         } else {

  582.             // max delta PCR 0.1s

  583.             service->pcr_packet_period =

  584.                 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);

  585.         }

  586.     }

  587. 

  588.     // output a PCR as soon as possible

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

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

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

  592. 

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

  594.         av_log(s, AV_LOG_INFO, "muxrate VBR, ");

  595.     else

  596.         av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);

  597.     av_log(s, AV_LOG_INFO, "pcr every %d pkts, "

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

  599.            service->pcr_packet_period,

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

  601. 

  602.     avio_flush(s->pb);

  603. 

  604.     return 0;

  605. 

  606.  fail:

  607.     av_free(pids);

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

  609.         MpegTSWriteStream *ts_st;

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

  611.         ts_st = st->priv_data;

  612.         if (ts_st) {

  613.             av_freep(&ts_st->payload);

  614.             av_freep(&ts_st->adts);

  615.         }

  616.         av_freep(&st->priv_data);

  617.     }

  618.     return -1;

  619. }

  620. 

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

  622. static void retransmit_si_info(AVFormatContext *s)

  623. {

  624.     MpegTSWrite *ts = s->priv_data;

  625.     int i;

  626. 

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

  628.         ts->sdt_packet_count = 0;

  629.         mpegts_write_sdt(s);

  630.     }

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

  632.         ts->pat_packet_count = 0;

  633.         mpegts_write_pat(s);

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

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

  636.         }

  637.     }

  638. }

  639. 

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

  641. {

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

  643.            ts->first_pcr;

  644. }

  645. 

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

  647. {

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

  649. 

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

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

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

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

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

  655.     *buf++ = pcr_low;

  656. 

  657.     return 6;

  658. }

  659. 

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

  661. static void mpegts_insert_null_packet(AVFormatContext *s)

  662. {

  663.     uint8_t *q;

  664.     uint8_t buf[TS_PACKET_SIZE];

  665. 

  666.     q = buf;

  667.     *q++ = 0x47;

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

  669.     *q++ = 0xff;

  670.     *q++ = 0x10;

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

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

  673. }

  674. 

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

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

  677. {

  678.     MpegTSWrite *ts = s->priv_data;

  679.     MpegTSWriteStream *ts_st = st->priv_data;

  680.     uint8_t *q;

  681.     uint8_t buf[TS_PACKET_SIZE];

  682. 

  683.     q = buf;

  684.     *q++ = 0x47;

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

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

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

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

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

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

  691. 

  692.     /* PCR coded into 6 bytes */

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

  694. 

  695.     /* stuffing bytes */

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

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

  698. }

  699. 

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

  701. {

  702.     int val;

  703. 

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

  705.     *q++ = val;

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

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

  708.     *q++ = val;

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

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

  711.     *q++ = val;

  712. }

  713. 

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

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

  716. {

  717.     // expect at least one flag to set

  718.     assert(flag);

  719. 

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

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

  722.         pkt[3] |= 0x20;

  723.         // 1 byte length, no flags

  724.         pkt[4] = 1;

  725.         pkt[5] = 0;

  726.     }

  727.     pkt[5] |= flag;

  728. }

  729. 

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

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

  732. {

  733.     // expect already existing adaptation field

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

  735.     pkt[4] += size;

  736. }

  737. 

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

  739. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  740. {

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

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

  743.     else

  744.         return pkt + 4;

  745. }

  746. 

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

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

  749.  * to exactly fill the last ts packet.

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

  751.  */

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

  753.                              const uint8_t *payload, int payload_size,

  754.                              int64_t pts, int64_t dts, int key)

  755. {

  756.     MpegTSWriteStream *ts_st = st->priv_data;

  757.     MpegTSWrite *ts = s->priv_data;

  758.     uint8_t buf[TS_PACKET_SIZE];

  759.     uint8_t *q;

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

  761.     int afc_len, stuffing_len;

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

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

  764. 

  765.     is_start = 1;

  766.     while (payload_size > 0) {

  767.         retransmit_si_info(s);

  768. 

  769.         write_pcr = 0;

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

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

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

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

  774.                 ts_st->service->pcr_packet_period) {

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

  776.                 write_pcr = 1;

  777.             }

  778.         }

  779. 

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

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

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

  783.             if (write_pcr)

  784.                 mpegts_insert_pcr_only(s, st);

  785.             else

  786.                 mpegts_insert_null_packet(s);

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

  788.         }

  789. 

  790.         /* prepare packet header */

  791.         q = buf;

  792.         *q++ = 0x47;

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

  794.         if (is_start)

  795.             val |= 0x40;

  796.         *q++ = val;

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

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

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

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

  801.             // set Random Access for key frames

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

  803.                 write_pcr = 1;

  804.             set_af_flag(buf, 0x40);

  805.             q = get_ts_payload_start(buf);

  806.         }

  807.         if (write_pcr) {

  808.             set_af_flag(buf, 0x10);

  809.             q = get_ts_payload_start(buf);

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

  811.             if (ts->mux_rate > 1)

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

  813.             else

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

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

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

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

  818.             q = get_ts_payload_start(buf);

  819.         }

  820.         if (is_start) {

  821.             int pes_extension = 0;

  822.             /* write PES header */

  823.             *q++ = 0x00;

  824.             *q++ = 0x00;

  825.             *q++ = 0x01;

  826.             private_code = 0;

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

  828.                 if (st->codec->codec_id == CODEC_ID_DIRAC) {

  829.                     *q++ = 0xfd;

  830.                 } else

  831.                     *q++ = 0xe0;

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

  833.                        (st->codec->codec_id == CODEC_ID_MP2 ||

  834.                         st->codec->codec_id == CODEC_ID_MP3 ||

  835.                         st->codec->codec_id == CODEC_ID_AAC)) {

  836.                 *q++ = 0xc0;

  837.             } else {

  838.                 *q++ = 0xbd;

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

  840.                     private_code = 0x20;

  841.                 }

  842.             }

  843.             header_len = 0;

  844.             flags = 0;

  845.             if (pts != AV_NOPTS_VALUE) {

  846.                 header_len += 5;

  847.                 flags |= 0x80;

  848.             }

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

  850.                 header_len += 5;

  851.                 flags |= 0x40;

  852.             }

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

  854.                 st->codec->codec_id == CODEC_ID_DIRAC) {

  855.                 /* set PES_extension_flag */

  856.                 pes_extension = 1;

  857.                 flags |= 0x01;

  858. 

  859.                 /*

  860.                 * One byte for PES2 extension flag +

  861.                 * one byte for extension length +

  862.                 * one byte for extension id

  863.                 */

  864.                 header_len += 3;

  865.             }

  866.             len = payload_size + header_len + 3;

  867.             if (private_code != 0)

  868.                 len++;

  869.             if (len > 0xffff)

  870.                 len = 0;

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

  872.             *q++ = len;

  873.             val = 0x80;

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

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

  876.                 val |= 0x04;

  877.             *q++ = val;

  878.             *q++ = flags;

  879.             *q++ = header_len;

  880.             if (pts != AV_NOPTS_VALUE) {

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

  882.                 q += 5;

  883.             }

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

  885.                 write_pts(q, 1, dts);

  886.                 q += 5;

  887.             }

  888.             if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {

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

  890.                 *q++ = flags;

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

  892.                 /*

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

  894.                 * write the extended stream id

  895.                 */

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

  897.             }

  898.             if (private_code != 0)

  899.                 *q++ = private_code;

  900.             is_start = 0;

  901.         }

  902.         /* header size */

  903.         header_len = q - buf;

  904.         /* data len */

  905.         len = TS_PACKET_SIZE - header_len;

  906.         if (len > payload_size)

  907.             len = payload_size;

  908.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  909.         if (stuffing_len > 0) {

  910.             /* add stuffing with AFC */

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

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

  913.                 afc_len = buf[4] + 1;

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

  915.                         buf + 4 + afc_len,

  916.                         header_len - (4 + afc_len));

  917.                 buf[4] += stuffing_len;

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

  919.             } else {

  920.                 /* add stuffing */

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

  922.                 buf[3] |= 0x20;

  923.                 buf[4] = stuffing_len - 1;

  924.                 if (stuffing_len >= 2) {

  925.                     buf[5] = 0x00;

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

  927.                 }

  928.             }

  929.         }

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

  931.         payload += len;

  932.         payload_size -= len;

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

  934.     }

  935.     avio_flush(s->pb);

  936. }

  937. 

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

  939. {

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

  941.     int size = pkt->size;

  942.     uint8_t *buf= pkt->data;

  943.     uint8_t *data= NULL;

  944.     MpegTSWrite *ts = s->priv_data;

  945.     MpegTSWriteStream *ts_st = st->priv_data;

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

  947.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  948. 

  949.     if (ts->reemit_pat_pmt) {

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

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

  952.         ts->reemit_pat_pmt = 0;

  953.     }

  954. 

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

  956.         pts = pkt->pts + delay;

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

  958.         dts = pkt->dts + delay;

  959. 

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

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

  962.         return -1;

  963.     }

  964.     ts_st->first_pts_check = 0;

  965. 

  966.     if (st->codec->codec_id == CODEC_ID_H264) {

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

  968.         uint32_t state = -1;

  969. 

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

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

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

  973.             return -1;

  974.         }

  975. 

  976.         do {

  977.             p = avpriv_mpv_find_start_code(p, buf_end, &state);

  978.             //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);

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

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

  981. 

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

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

  984.             if (!data)

  985.                 return -1;

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

  987.             AV_WB32(data, 0x00000001);

  988.             data[4] = 0x09;

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

  990.             buf  = data;

  991.             size = pkt->size+6;

  992.         }

  993.     } else if (st->codec->codec_id == CODEC_ID_AAC) {

  994.         if (pkt->size < 2)

  995.             return -1;

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

  997.             ADTSContext *adts = ts_st->adts;

  998.             int new_size, err;

  999.             if (!adts) {

  1000.                 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "

  1001.                        "and extradata missing\n");

  1002.                 return -1;

  1003.             }

  1004.             new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;

  1005.             if ((unsigned)new_size >= INT_MAX)

  1006.                 return -1;

  1007.             data = av_malloc(new_size);

  1008.             if (!data)

  1009.                 return AVERROR(ENOMEM);

  1010.             err = ff_adts_write_frame_header(adts, data, pkt->size,

  1011.                                              adts->pce_size);

  1012.             if (err < 0) {

  1013.                 av_free(data);

  1014.                 return err;

  1015.             }

  1016.             if (adts->pce_size) {

  1017.                 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);

  1018.                 adts->pce_size = 0;

  1019.             }

  1020.             memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);

  1021.             buf = data;

  1022.             size = new_size;

  1023.         }

  1024.     }

  1025. 

  1026.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  1027.         // for video and subtitle, write a single pes packet

  1028.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1029.         av_free(data);

  1030.         return 0;

  1031.     }

  1032. 

  1033.     if (ts_st->payload_size + size > ts->pes_payload_size) {

  1034.         if (ts_st->payload_size) {

  1035.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1036.                              ts_st->payload_pts, ts_st->payload_dts,

  1037.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1038.             ts_st->payload_size = 0;

  1039.         }

  1040.         if (size > ts->pes_payload_size) {

  1041.             mpegts_write_pes(s, st, buf, size, pts, dts,

  1042.                              pkt->flags & AV_PKT_FLAG_KEY);

  1043.             av_free(data);

  1044.             return 0;

  1045.         }

  1046.     }

  1047. 

  1048.     if (!ts_st->payload_size) {

  1049.         ts_st->payload_pts = pts;

  1050.         ts_st->payload_dts = dts;

  1051.         ts_st->payload_flags = pkt->flags;

  1052.     }

  1053. 

  1054.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1055.     ts_st->payload_size += size;

  1056. 

  1057.     av_free(data);

  1058. 

  1059.     return 0;

  1060. }

  1061. 

  1062. static void mpegts_write_flush(AVFormatContext *s)

  1063. {

  1064.     int i;

  1065. 

  1066.     /* flush current packets */

  1067.     for(i = 0; i < s->nb_streams; i++) {

  1068.         AVStream *st = s->streams[i];

  1069.         MpegTSWriteStream *ts_st = st->priv_data;

  1070.         if (ts_st->payload_size > 0) {

  1071.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1072.                              ts_st->payload_pts, ts_st->payload_dts,

  1073.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1074.             ts_st->payload_size = 0;

  1075.         }

  1076.     }

  1077.     avio_flush(s->pb);

  1078. }

  1079. 

  1080. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)

  1081. {

  1082.     if (!pkt) {

  1083.         mpegts_write_flush(s);

  1084.         return 1;

  1085.     } else {

  1086.         return mpegts_write_packet_internal(s, pkt);

  1087.     }

  1088. }

  1089. 

  1090. static int mpegts_write_end(AVFormatContext *s)

  1091. {

  1092.     MpegTSWrite *ts = s->priv_data;

  1093.     MpegTSService *service;

  1094.     int i;

  1095. 

  1096.     mpegts_write_flush(s);

  1097. 

  1098.     for(i = 0; i < s->nb_streams; i++) {

  1099.         AVStream *st = s->streams[i];

  1100.         MpegTSWriteStream *ts_st = st->priv_data;

  1101.         av_freep(&ts_st->payload);

  1102.         av_freep(&ts_st->adts);

  1103.     }

  1104. 

  1105.     for(i = 0; i < ts->nb_services; i++) {

  1106.         service = ts->services[i];

  1107.         av_freep(&service->provider_name);

  1108.         av_freep(&service->name);

  1109.         av_free(service);

  1110.     }

  1111.     av_free(ts->services);

  1112. 

  1113.     return 0;

  1114. }

  1115. 

  1116. AVOutputFormat ff_mpegts_muxer = {

  1117.     .name              = "mpegts",

  1118.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1119.     .mime_type         = "video/x-mpegts",

  1120.     .extensions        = "ts,m2t",

  1121.     .priv_data_size    = sizeof(MpegTSWrite),

  1122.     .audio_codec       = CODEC_ID_MP2,

  1123.     .video_codec       = CODEC_ID_MPEG2VIDEO,

  1124.     .write_header      = mpegts_write_header,

  1125.     .write_packet      = mpegts_write_packet,

  1126.     .write_trailer     = mpegts_write_end,

  1127.     .flags             = AVFMT_ALLOW_FLUSH,

  1128.     .priv_class        = &mpegts_muxer_class,

  1129. };