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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. 

  29. #include "libavcodec/internal.h"

  30. 

  31. #include "avformat.h"

  32. #include "avio_internal.h"

  33. #include "internal.h"

  34. #include "mpegts.h"

  35. 

  36. #define PCR_TIME_BASE 27000000

  37. 

  38. /* write DVB SI sections */

  39. 

  40. /*********************************************/

  41. /* mpegts section writer */

  42. 

  43. typedef struct MpegTSSection {

  44.     int pid;

  45.     int cc;

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

  47.     void *opaque;

  48. } MpegTSSection;

  49. 

  50. typedef struct MpegTSService {

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

  52.     int sid;           /* service ID */

  53.     char *name;

  54.     char *provider_name;

  55.     int pcr_pid;

  56.     int pcr_packet_count;

  57.     int pcr_packet_period;

  58. } MpegTSService;

  59. 

  60. typedef struct MpegTSWrite {

  61.     const AVClass *av_class;

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

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

  64.     MpegTSService **services;

  65.     int sdt_packet_count;

  66.     int sdt_packet_period;

  67.     int pat_packet_count;

  68.     int pat_packet_period;

  69.     int nb_services;

  70.     int onid;

  71.     int tsid;

  72.     int64_t first_pcr;

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

  74.     int pes_payload_size;

  75. 

  76.     int transport_stream_id;

  77.     int original_network_id;

  78.     int service_id;

  79. 

  80.     int pmt_start_pid;

  81.     int start_pid;

  82.     int m2ts_mode;

  83. 

  84.     int reemit_pat_pmt; // backward compatibility

  85. 

  86.     int pcr_period;

  87. #define MPEGTS_FLAG_REEMIT_PAT_PMT  0x01

  88. #define MPEGTS_FLAG_AAC_LATM        0x02

  89. #define MPEGTS_FLAG_SYSTEM_B        0x04

  90.     int flags;

  91. } MpegTSWrite;

  92. 

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

  94. #define DEFAULT_PES_HEADER_FREQ  16

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

  96. 

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

  98.  * 10 bits should not exceed 1021. */

  99. #define SECTION_LENGTH 1020

  100. 

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

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

  103. {

  104.     unsigned int crc;

  105.     unsigned char packet[TS_PACKET_SIZE];

  106.     const unsigned char *buf_ptr;

  107.     unsigned char *q;

  108.     int first, b, len1, left;

  109. 

  110.     crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE),

  111.                             -1, buf, len - 4));

  112. 

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

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

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

  116.     buf[len - 1] =  crc        & 0xff;

  117. 

  118.     /* send each packet */

  119.     buf_ptr = buf;

  120.     while (len > 0) {

  121.         first = buf == buf_ptr;

  122.         q     = packet;

  123.         *q++  = 0x47;

  124.         b     = s->pid >> 8;

  125.         if (first)

  126.             b |= 0x40;

  127.         *q++  = b;

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

  129.         s->cc = s->cc + 1 & 0xf;

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

  131.         if (first)

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

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

  134.         if (len1 > len)

  135.             len1 = len;

  136.         memcpy(q, buf_ptr, len1);

  137.         q += len1;

  138.         /* add known padding data */

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

  140.         if (left > 0)

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

  142. 

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

  144. 

  145.         buf_ptr += len1;

  146.         len     -= len1;

  147.     }

  148. }

  149. 

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

  151. {

  152.     uint8_t *q;

  153.     q      = *q_ptr;

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

  155.     *q++   = val;

  156.     *q_ptr = q;

  157. }

  158. 

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

  160.                                  int version, int sec_num, int last_sec_num,

  161.                                  uint8_t *buf, int len)

  162. {

  163.     uint8_t section[1024], *q;

  164.     unsigned int tot_len;

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

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

  167. 

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

  169.     /* check if not too big */

  170.     if (tot_len > 1024)

  171.         return AVERROR_INVALIDDATA;

  172. 

  173.     q    = section;

  174.     *q++ = tid;

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

  176.     put16(&q, id);

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

  178.     *q++ = sec_num;

  179.     *q++ = last_sec_num;

  180.     memcpy(q, buf, len);

  181. 

  182.     mpegts_write_section(s, section, tot_len);

  183.     return 0;

  184. }

  185. 

  186. /*********************************************/

  187. /* mpegts writer */

  188. 

  189. #define DEFAULT_PROVIDER_NAME   "Libav"

  190. #define DEFAULT_SERVICE_NAME    "Service01"

  191. 

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

  193. #define SDT_RETRANS_TIME 500

  194. #define PAT_RETRANS_TIME 100

  195. #define PCR_RETRANS_TIME 20

  196. 

  197. typedef struct MpegTSWriteStream {

  198.     struct MpegTSService *service;

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

  200.     int cc;

  201.     int payload_size;

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

  203.     int64_t payload_pts;

  204.     int64_t payload_dts;

  205.     int payload_flags;

  206.     uint8_t *payload;

  207.     AVFormatContext *amux;

  208.     AVRational user_tb;

  209. } MpegTSWriteStream;

  210. 

  211. static void mpegts_write_pat(AVFormatContext *s)

  212. {

  213.     MpegTSWrite *ts = s->priv_data;

  214.     MpegTSService *service;

  215.     uint8_t data[SECTION_LENGTH], *q;

  216.     int i;

  217. 

  218.     q = data;

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

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

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

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

  223.     }

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

  225.                           data, q - data);

  226. }

  227. 

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

  229. {

  230.     MpegTSWrite *ts = s->priv_data;

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

  232.     int val, stream_type, i, err = 0;

  233. 

  234.     q = data;

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

  236. 

  237.     program_info_length_ptr = q;

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

  239. 

  240.     /* put program info here */

  241. 

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

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

  244.     program_info_length_ptr[1] = val;

  245. 

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

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

  248.         MpegTSWriteStream *ts_st = st->priv_data;

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

  250. 

  251.         if (q - data > SECTION_LENGTH - 3 - 2 - 6) {

  252.             err = 1;

  253.             break;

  254.         }

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

  256.         case AV_CODEC_ID_MPEG1VIDEO:

  257.         case AV_CODEC_ID_MPEG2VIDEO:

  258.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  259.             break;

  260.         case AV_CODEC_ID_MPEG4:

  261.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  262.             break;

  263.         case AV_CODEC_ID_H264:

  264.             stream_type = STREAM_TYPE_VIDEO_H264;

  265.             break;

  266.         case AV_CODEC_ID_HEVC:

  267.             stream_type = STREAM_TYPE_VIDEO_HEVC;

  268.             break;

  269.         case AV_CODEC_ID_CAVS:

  270.             stream_type = STREAM_TYPE_VIDEO_CAVS;

  271.             break;

  272.         case AV_CODEC_ID_DIRAC:

  273.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  274.             break;

  275.         case AV_CODEC_ID_MP2:

  276.         case AV_CODEC_ID_MP3:

  277.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  278.             break;

  279.         case AV_CODEC_ID_AAC:

  280.             stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM)

  281.                           ? STREAM_TYPE_AUDIO_AAC_LATM

  282.                           : STREAM_TYPE_AUDIO_AAC;

  283.             break;

  284.         case AV_CODEC_ID_AAC_LATM:

  285.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  286.             break;

  287.         case AV_CODEC_ID_AC3:

  288.             stream_type = (ts->flags & MPEGTS_FLAG_SYSTEM_B)

  289.                           ? STREAM_TYPE_PRIVATE_DATA

  290.                           : STREAM_TYPE_AUDIO_AC3;

  291.             break;

  292.         default:

  293.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  294.             break;

  295.         }

  296.         *q++ = stream_type;

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

  298.         desc_length_ptr = q;

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

  300. 

  301.         /* write optional descriptors here */

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

  303.         case AVMEDIA_TYPE_AUDIO:

  304.             if (st->codec->codec_id == AV_CODEC_ID_AC3 && (ts->flags & MPEGTS_FLAG_SYSTEM_B)) {

  305.                 *q++ = 0x6a; /* ETSI EN 300 468 AC-3 descriptor */

  306.                 *q++ = 1;

  307.                 *q++ = 0x00;

  308.             }

  309. 

  310.             if (lang) {

  311.                 char *p;

  312.                 char *next = lang->value;

  313.                 uint8_t *len_ptr;

  314. 

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

  316.                 len_ptr  = q++;

  317.                 *len_ptr = 0;

  318. 

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

  320.                     if (q - data > SECTION_LENGTH - 4) {

  321.                         err = 1;

  322.                         break;

  323.                     }

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

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

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

  327. 

  328.                     *q++ = *p++;

  329.                     *q++ = *p++;

  330.                     *q++ = *p++;

  331. 

  332.                     if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  333.                         *q++ = 0x01;

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

  335.                         *q++ = 0x02;

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

  337.                         *q++ = 0x03;

  338.                     else

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

  340. 

  341.                     *len_ptr += 4;

  342.                 }

  343. 

  344.                 if (*len_ptr == 0)

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

  346.             }

  347.             break;

  348.         case AVMEDIA_TYPE_SUBTITLE:

  349.         {

  350.             const char *language;

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

  352.             *q++ = 0x59;

  353.             *q++ = 8;

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

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

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

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

  358. 

  359.             if (q - data > SECTION_LENGTH - 4) {

  360.                 err = 1;

  361.                 break;

  362.             }

  363. 

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

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

  366.                 q += 4;

  367.             } else {

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

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

  370.             }

  371.         }

  372.         break;

  373.         case AVMEDIA_TYPE_VIDEO:

  374.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  376.                 *q++ = 4;

  377.                 *q++ = 'd';

  378.                 *q++ = 'r';

  379.                 *q++ = 'a';

  380.                 *q++ = 'c';

  381.             }

  382.             break;

  383.         }

  384. 

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

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

  387.         desc_length_ptr[1] = val;

  388.     }

  389. 

  390.     if (err)

  391.         av_log(s, AV_LOG_ERROR,

  392.                "The PMT section cannot fit stream %d and all following streams.\n"

  393.                "Try reducing the number of languages in the audio streams "

  394.                "or the total number of streams.\n", i);

  395. 

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

  397.                           data, q - data);

  398. }

  399. 

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

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

  402. {

  403.     uint8_t *q;

  404.     int len;

  405. 

  406.     q = *q_ptr;

  407.     if (!str)

  408.         len = 0;

  409.     else

  410.         len = strlen(str);

  411.     *q++ = len;

  412.     memcpy(q, str, len);

  413.     q     += len;

  414.     *q_ptr = q;

  415. }

  416. 

  417. static void mpegts_write_sdt(AVFormatContext *s)

  418. {

  419.     MpegTSWrite *ts = s->priv_data;

  420.     MpegTSService *service;

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

  422.     int i, running_status, free_ca_mode, val;

  423. 

  424.     q = data;

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

  426.     *q++ = 0xff;

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

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

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

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

  431.         desc_list_len_ptr = q;

  432.         q                += 2;

  433.         running_status    = 4; /* running */

  434.         free_ca_mode      = 0;

  435. 

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

  437.         *q++         = 0x48;

  438.         desc_len_ptr = q;

  439.         q++;

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

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

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

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

  444. 

  445.         /* fill descriptor length */

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

  447.               (q - desc_list_len_ptr - 2);

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

  449.         desc_list_len_ptr[1] = val;

  450.     }

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

  452.                           data, q - data);

  453. }

  454. 

  455. static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid,

  456.                                          const char *provider_name,

  457.                                          const char *name)

  458. {

  459.     MpegTSService *service;

  460. 

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

  462.     if (!service)

  463.         return NULL;

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

  465.     service->sid           = sid;

  466.     service->pcr_pid       = 0x1fff;

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

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

  469.     if (!service->provider_name || !service->name) {

  470.         av_free(service->provider_name);

  471.         av_free(service->name);

  472.         av_free(service);

  473.         return NULL;

  474.     }

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

  476.     return service;

  477. }

  478. 

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

  480. {

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

  482.            ts->first_pcr;

  483. }

  484. 

  485. static void mpegts_prefix_m2ts_header(AVFormatContext *s)

  486. {

  487.     MpegTSWrite *ts = s->priv_data;

  488.     if (ts->m2ts_mode) {

  489.         int64_t pcr = get_pcr(s->priv_data, s->pb);

  490.         uint32_t tp_extra_header = pcr % 0x3fffffff;

  491.         tp_extra_header = AV_RB32(&tp_extra_header);

  492.         avio_write(s->pb, (unsigned char *) &tp_extra_header,

  493.                    sizeof(tp_extra_header));

  494.     }

  495. }

  496. 

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

  498. {

  499.     AVFormatContext *ctx = s->opaque;

  500.     mpegts_prefix_m2ts_header(ctx);

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

  502. }

  503. 

  504. static int mpegts_write_header(AVFormatContext *s)

  505. {

  506.     MpegTSWrite *ts = s->priv_data;

  507.     MpegTSWriteStream *ts_st;

  508.     MpegTSService *service;

  509.     AVStream *st, *pcr_st = NULL;

  510.     AVDictionaryEntry *title, *provider;

  511.     int i, j;

  512.     const char *service_name;

  513.     const char *provider_name;

  514.     int *pids;

  515.     int ret;

  516. 

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

  518.         s->max_delay = 0;

  519. 

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

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

  522. 

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

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

  525.     /* allocate a single DVB service */

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

  527.     if (!title)

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

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

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

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

  532.     service       = mpegts_add_service(ts, ts->service_id,

  533.                                        provider_name, service_name);

  534. 

  535.     if (!service)

  536.         return AVERROR(ENOMEM);

  537. 

  538.     service->pmt.write_packet = section_write_packet;

  539.     service->pmt.opaque       = s;

  540.     service->pmt.cc           = 15;

  541. 

  542.     ts->pat.pid          = PAT_PID;

  543.     /* Initialize at 15 so that it wraps and is equal to 0 for the

  544.      * first packet we write. */

  545.     ts->pat.cc           = 15;

  546.     ts->pat.write_packet = section_write_packet;

  547.     ts->pat.opaque       = s;

  548. 

  549.     ts->sdt.pid          = SDT_PID;

  550.     ts->sdt.cc           = 15;

  551.     ts->sdt.write_packet = section_write_packet;

  552.     ts->sdt.opaque       = s;

  553. 

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

  555.     if (!pids) {

  556.         av_free(service);

  557.         return AVERROR(ENOMEM);

  558.     }

  559. 

  560.     /* assign pids to each stream */

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

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

  563. 

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

  565.         if (!ts_st) {

  566.             ret = AVERROR(ENOMEM);

  567.             goto fail;

  568.         }

  569.         st->priv_data = ts_st;

  570. 

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

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

  573. 

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

  575.         if (!ts_st->payload) {

  576.             ret = AVERROR(ENOMEM);

  577.             goto fail;

  578.         }

  579.         ts_st->service = service;

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

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

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

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

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

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

  586.         } else {

  587.             av_log(s, AV_LOG_ERROR,

  588.                    "Invalid stream id %d, must be less than 8191\n", st->id);

  589.             ret = AVERROR(EINVAL);

  590.             goto fail;

  591.         }

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

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

  594.             ret = AVERROR(EINVAL);

  595.             goto fail;

  596.         }

  597.         for (j = 0; j < i; j++) {

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

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

  600.                 ret = AVERROR(EINVAL);

  601.                 goto fail;

  602.             }

  603.         }

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

  605.         ts_st->payload_pts     = AV_NOPTS_VALUE;

  606.         ts_st->payload_dts     = AV_NOPTS_VALUE;

  607.         ts_st->first_pts_check = 1;

  608.         ts_st->cc              = 15;

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

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

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

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

  613.             pcr_st           = st;

  614.         }

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

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

  617.             AVStream *ast;

  618.             ts_st->amux = avformat_alloc_context();

  619.             if (!ts_st->amux) {

  620.                 ret = AVERROR(ENOMEM);

  621.                 goto fail;

  622.             }

  623.             ts_st->amux->oformat =

  624.                 av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts",

  625.                                 NULL, NULL);

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

  627.                 ret = AVERROR(EINVAL);

  628.                 goto fail;

  629.             }

  630.             if (!(ast = avformat_new_stream(ts_st->amux, NULL))) {

  631.                 ret = AVERROR(ENOMEM);

  632.                 goto fail;

  633.             }

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

  635.             if (ret != 0)

  636.                 goto fail;

  637.             ast->time_base = st->time_base;

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

  639.             if (ret < 0)

  640.                 goto fail;

  641.         }

  642.     }

  643. 

  644.     av_free(pids);

  645. 

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

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

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

  649.         ts_st            = pcr_st->priv_data;

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

  651.     } else

  652.         ts_st = pcr_st->priv_data;

  653. 

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

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

  656.                                      (TS_PACKET_SIZE * 8 * 1000);

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

  658.                                      (TS_PACKET_SIZE * 8 * 1000);

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

  660.                                      (TS_PACKET_SIZE * 8 * 1000);

  661. 

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

  663.     } else {

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

  665.         ts->sdt_packet_period = 200;

  666.         ts->pat_packet_period = 40;

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

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

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

  670.                 service->pcr_packet_period =

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

  672.             } else {

  673.                 service->pcr_packet_period =

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

  675.             }

  676.         } else {

  677.             // max delta PCR 0.1s

  678.             // TODO: should be avg_frame_rate

  679.             service->pcr_packet_period =

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

  681.         }

  682.     }

  683. 

  684.     // output a PCR as soon as possible

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

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

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

  688. 

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

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

  691.     else

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

  693.     av_log(s, AV_LOG_VERBOSE,

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

  695.            service->pcr_packet_period,

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

  697. 

  698.     if (ts->m2ts_mode == -1) {

  699.         if (av_match_ext(s->filename, "m2ts")) {

  700.             ts->m2ts_mode = 1;

  701.         } else {

  702.             ts->m2ts_mode = 0;

  703.         }

  704.     }

  705. 

  706.     avio_flush(s->pb);

  707. 

  708.     return 0;

  709. 

  710. fail:

  711.     av_free(service);

  712.     av_free(pids);

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

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

  715.         ts_st = st->priv_data;

  716.         if (ts_st) {

  717.             av_freep(&ts_st->payload);

  718.             if (ts_st->amux) {

  719.                 avformat_free_context(ts_st->amux);

  720.                 ts_st->amux = NULL;

  721.             }

  722.         }

  723.         av_freep(&st->priv_data);

  724.     }

  725.     return ret;

  726. }

  727. 

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

  729. static void retransmit_si_info(AVFormatContext *s)

  730. {

  731.     MpegTSWrite *ts = s->priv_data;

  732.     int i;

  733. 

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

  735.         ts->sdt_packet_count = 0;

  736.         mpegts_write_sdt(s);

  737.     }

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

  739.         ts->pat_packet_count = 0;

  740.         mpegts_write_pat(s);

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

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

  743.     }

  744. }

  745. 

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

  747. {

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

  749. 

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

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

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

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

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

  755.     *buf++ = pcr_low;

  756. 

  757.     return 6;

  758. }

  759. 

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

  761. static void mpegts_insert_null_packet(AVFormatContext *s)

  762. {

  763.     uint8_t *q;

  764.     uint8_t buf[TS_PACKET_SIZE];

  765. 

  766.     q    = buf;

  767.     *q++ = 0x47;

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

  769.     *q++ = 0xff;

  770.     *q++ = 0x10;

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

  772.     mpegts_prefix_m2ts_header(s);

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

  774. }

  775. 

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

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

  778. {

  779.     MpegTSWrite *ts = s->priv_data;

  780.     MpegTSWriteStream *ts_st = st->priv_data;

  781.     uint8_t *q;

  782.     uint8_t buf[TS_PACKET_SIZE];

  783. 

  784.     q    = buf;

  785.     *q++ = 0x47;

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

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

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

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

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

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

  792. 

  793.     /* PCR coded into 6 bytes */

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

  795. 

  796.     /* stuffing bytes */

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

  798.     mpegts_prefix_m2ts_header(s);

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

  800. }

  801. 

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

  803. {

  804.     int val;

  805. 

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

  807.     *q++ = val;

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

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

  810.     *q++ = val;

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

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

  813.     *q++ = val;

  814. }

  815. 

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

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

  818. {

  819.     // expect at least one flag to set

  820.     assert(flag);

  821. 

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

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

  824.         pkt[3] |= 0x20;

  825.         // 1 byte length, no flags

  826.         pkt[4] = 1;

  827.         pkt[5] = 0;

  828.     }

  829.     pkt[5] |= flag;

  830. }

  831. 

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

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

  834. {

  835.     // expect already existing adaptation field

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

  837.     pkt[4] += size;

  838. }

  839. 

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

  841. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  842. {

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

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

  845.     else

  846.         return pkt + 4;

  847. }

  848. 

  849. /* Add a PES header to the front of the payload, and segment into an integer

  850.  * number of TS packets. The final TS packet is padded using an oversized

  851.  * adaptation header to exactly fill the last TS packet.

  852.  * NOTE: 'payload' contains a complete PES payload. */

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

  854.                              const uint8_t *payload, int payload_size,

  855.                              int64_t pts, int64_t dts, int key)

  856. {

  857.     MpegTSWriteStream *ts_st = st->priv_data;

  858.     MpegTSWrite *ts = s->priv_data;

  859.     uint8_t buf[TS_PACKET_SIZE];

  860.     uint8_t *q;

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

  862.     int afc_len, stuffing_len;

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

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

  865. 

  866.     is_start = 1;

  867.     while (payload_size > 0) {

  868.         retransmit_si_info(s);

  869. 

  870.         write_pcr = 0;

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

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

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

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

  875.                 ts_st->service->pcr_packet_period) {

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

  877.                 write_pcr = 1;

  878.             }

  879.         }

  880. 

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

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

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

  884.             if (write_pcr)

  885.                 mpegts_insert_pcr_only(s, st);

  886.             else

  887.                 mpegts_insert_null_packet(s);

  888.             /* recalculate write_pcr and possibly retransmit si_info */

  889.             continue;

  890.         }

  891. 

  892.         /* prepare packet header */

  893.         q    = buf;

  894.         *q++ = 0x47;

  895.         val  = ts_st->pid >> 8;

  896.         if (is_start)

  897.             val |= 0x40;

  898.         *q++      = val;

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

  900.         ts_st->cc = ts_st->cc + 1 & 0xf;

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

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

  903.             // set Random Access for key frames

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

  905.                 write_pcr = 1;

  906.             set_af_flag(buf, 0x40);

  907.             q = get_ts_payload_start(buf);

  908.         }

  909.         if (write_pcr) {

  910.             set_af_flag(buf, 0x10);

  911.             q = get_ts_payload_start(buf);

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

  913.             if (ts->mux_rate > 1)

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

  915.             else

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

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

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

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

  920.             q = get_ts_payload_start(buf);

  921.         }

  922.         if (is_start) {

  923.             int pes_extension = 0;

  924.             /* write PES header */

  925.             *q++ = 0x00;

  926.             *q++ = 0x00;

  927.             *q++ = 0x01;

  928.             private_code = 0;

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

  930.                 if (st->codec->codec_id == AV_CODEC_ID_DIRAC)

  931.                     *q++ = 0xfd;

  932.                 else

  933.                     *q++ = 0xe0;

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

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

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

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

  938.                 *q++ = 0xc0;

  939.             } else {

  940.                 *q++ = 0xbd;

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

  942.                     private_code = 0x20;

  943.             }

  944.             header_len = 0;

  945.             flags      = 0;

  946.             if (pts != AV_NOPTS_VALUE) {

  947.                 header_len += 5;

  948.                 flags      |= 0x80;

  949.             }

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

  951.                 header_len += 5;

  952.                 flags      |= 0x40;

  953.             }

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

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

  956.                 /* set PES_extension_flag */

  957.                 pes_extension = 1;

  958.                 flags        |= 0x01;

  959. 

  960.                 /* One byte for PES2 extension flag +

  961.                  * one byte for extension length +

  962.                  * one byte for extension id */

  963.                 header_len += 3;

  964.             }

  965.             len = payload_size + header_len + 3;

  966.             if (private_code != 0)

  967.                 len++;

  968.             if (len > 0xffff)

  969.                 len = 0;

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

  971.             *q++ = len;

  972.             val  = 0x80;

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

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

  975.                 val |= 0x04;

  976.             *q++ = val;

  977.             *q++ = flags;

  978.             *q++ = header_len;

  979.             if (pts != AV_NOPTS_VALUE) {

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

  981.                 q += 5;

  982.             }

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

  984.                 write_pts(q, 1, dts);

  985.                 q += 5;

  986.             }

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

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

  989.                 *q++  = flags;

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

  991.                 /* Set the stream ID extension flag bit to 0 and

  992.                  * write the extended stream ID. */

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

  994.             }

  995.             if (private_code != 0)

  996.                 *q++ = private_code;

  997.             is_start = 0;

  998.         }

  999.         /* header size */

  1000.         header_len = q - buf;

  1001.         /* data len */

  1002.         len = TS_PACKET_SIZE - header_len;

  1003.         if (len > payload_size)

  1004.             len = payload_size;

  1005.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  1006.         if (stuffing_len > 0) {

  1007.             /* add stuffing with AFC */

  1008.             if (buf[3] & 0x20) {

  1009.                 /* stuffing already present: increase its size */

  1010.                 afc_len = buf[4] + 1;

  1011.                 memmove(buf + 4 + afc_len + stuffing_len,

  1012.                         buf + 4 + afc_len,

  1013.                         header_len - (4 + afc_len));

  1014.                 buf[4] += stuffing_len;

  1015.                 memset(buf + 4 + afc_len, 0xff, stuffing_len);

  1016.             } else {

  1017.                 /* add stuffing */

  1018.                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);

  1019.                 buf[3] |= 0x20;

  1020.                 buf[4]  = stuffing_len - 1;

  1021.                 if (stuffing_len >= 2) {

  1022.                     buf[5] = 0x00;

  1023.                     memset(buf + 6, 0xff, stuffing_len - 2);

  1024.                 }

  1025.             }

  1026.         }

  1027.         memcpy(buf + TS_PACKET_SIZE - len, payload, len);

  1028.         payload      += len;

  1029.         payload_size -= len;

  1030.         mpegts_prefix_m2ts_header(s);

  1031.         avio_write(s->pb, buf, TS_PACKET_SIZE);

  1032.     }

  1033.     avio_flush(s->pb);

  1034. }

  1035. 

  1036. static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)

  1037. {

  1038.     AVStream *st = s->streams[pkt->stream_index];

  1039.     int size = pkt->size;

  1040.     uint8_t *buf = pkt->data;

  1041.     uint8_t *data = NULL;

  1042.     MpegTSWrite *ts = s->priv_data;

  1043.     MpegTSWriteStream *ts_st = st->priv_data;

  1044.     const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) * 2;

  1045.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  1046. 

  1047.     if (ts->reemit_pat_pmt) {

  1048.         av_log(s, AV_LOG_WARNING,

  1049.                "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");

  1050.         ts->reemit_pat_pmt = 0;

  1051.         ts->flags         |= MPEGTS_FLAG_REEMIT_PAT_PMT;

  1052.     }

  1053. 

  1054.     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {

  1055.         ts->pat_packet_count = ts->pat_packet_period - 1;

  1056.         ts->sdt_packet_count = ts->sdt_packet_period - 1;

  1057.         ts->flags           &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;

  1058.     }

  1059. 

  1060.     if (pkt->pts != AV_NOPTS_VALUE)

  1061.         pts = pkt->pts + delay;

  1062.     if (pkt->dts != AV_NOPTS_VALUE)

  1063.         dts = pkt->dts + delay;

  1064. 

  1065.     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {

  1066.         av_log(s, AV_LOG_ERROR, "first pts value must set\n");

  1067.         return AVERROR_INVALIDDATA;

  1068.     }

  1069.     ts_st->first_pts_check = 0;

  1070. 

  1071.     if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1072.         const uint8_t *p = buf, *buf_end = p + size;

  1073.         uint32_t state = -1;

  1074. 

  1075.         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {

  1076.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "

  1077.                    "no startcode found, use -bsf h264_mp4toannexb\n");

  1078.             return AVERROR_INVALIDDATA;

  1079.         }

  1080. 

  1081.         do {

  1082.             p = avpriv_find_start_code(p, buf_end, &state);

  1083.             av_log(s, AV_LOG_TRACE, "nal %d\n", state & 0x1f);

  1084.         } while (p < buf_end && (state & 0x1f) != 9 &&

  1085.                  (state & 0x1f) != 5 && (state & 0x1f) != 1);

  1086. 

  1087.         if ((state & 0x1f) != 9) { // AUD NAL

  1088.             data = av_malloc(pkt->size + 6);

  1089.             if (!data)

  1090.                 return AVERROR(ENOMEM);

  1091.             memcpy(data + 6, pkt->data, pkt->size);

  1092.             AV_WB32(data, 0x00000001);

  1093.             data[4] = 0x09;

  1094.             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit

  1095.             buf     = data;

  1096.             size    = pkt->size + 6;

  1097.         }

  1098.     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {

  1099.         if (pkt->size < 2) {

  1100.             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");

  1101.             return AVERROR_INVALIDDATA;

  1102.         }

  1103.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {

  1104.             int ret;

  1105.             AVPacket pkt2;

  1106. 

  1107.             if (!ts_st->amux) {

  1108.                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "

  1109.                                         "and extradata missing\n");

  1110.                 return AVERROR_INVALIDDATA;

  1111.             }

  1112. 

  1113.             av_init_packet(&pkt2);

  1114.             pkt2.data = pkt->data;

  1115.             pkt2.size = pkt->size;

  1116. 

  1117.             ret = avio_open_dyn_buf(&ts_st->amux->pb);

  1118.             if (ret < 0)

  1119.                 return AVERROR(ENOMEM);

  1120. 

  1121.             ret = av_write_frame(ts_st->amux, &pkt2);

  1122.             if (ret < 0) {

  1123.                 ffio_free_dyn_buf(&ts_st->amux->pb);

  1124.                 return ret;

  1125.             }

  1126.             size            = avio_close_dyn_buf(ts_st->amux->pb, &data);

  1127.             ts_st->amux->pb = NULL;

  1128.             buf             = data;

  1129.         }

  1130.     }

  1131. 

  1132.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  1133.         // for video and subtitle, write a single pes packet

  1134.         mpegts_write_pes(s, st, buf, size, pts, dts,

  1135.                          pkt->flags & AV_PKT_FLAG_KEY);

  1136.         av_free(data);

  1137.         return 0;

  1138.     }

  1139. 

  1140.     if (ts_st->payload_size + size > ts->pes_payload_size ||

  1141.         (dts != AV_NOPTS_VALUE && ts_st->payload_dts != AV_NOPTS_VALUE &&

  1142.          av_compare_ts(dts - ts_st->payload_dts, st->time_base,

  1143.                        s->max_delay, AV_TIME_BASE_Q) >= 0)) {

  1144.         if (ts_st->payload_size) {

  1145.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1146.                              ts_st->payload_pts, ts_st->payload_dts,

  1147.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1148.             ts_st->payload_size = 0;

  1149.         }

  1150.         if (size > ts->pes_payload_size) {

  1151.             mpegts_write_pes(s, st, buf, size, pts, dts,

  1152.                              pkt->flags & AV_PKT_FLAG_KEY);

  1153.             av_free(data);

  1154.             return 0;

  1155.         }

  1156.     }

  1157. 

  1158.     if (!ts_st->payload_size) {

  1159.         ts_st->payload_pts   = pts;

  1160.         ts_st->payload_dts   = dts;

  1161.         ts_st->payload_flags = pkt->flags;

  1162.     }

  1163. 

  1164.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1165.     ts_st->payload_size += size;

  1166. 

  1167.     av_free(data);

  1168. 

  1169.     return 0;

  1170. }

  1171. 

  1172. static void mpegts_write_flush(AVFormatContext *s)

  1173. {

  1174.     int i;

  1175. 

  1176.     /* flush current packets */

  1177.     for (i = 0; i < s->nb_streams; i++) {

  1178.         AVStream *st = s->streams[i];

  1179.         MpegTSWriteStream *ts_st = st->priv_data;

  1180.         if (ts_st->payload_size > 0) {

  1181.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1182.                              ts_st->payload_pts, ts_st->payload_dts,

  1183.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1184.             ts_st->payload_size = 0;

  1185.         }

  1186.     }

  1187.     avio_flush(s->pb);

  1188. }

  1189. 

  1190. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)

  1191. {

  1192.     if (!pkt) {

  1193.         mpegts_write_flush(s);

  1194.         return 1;

  1195.     } else {

  1196.         return mpegts_write_packet_internal(s, pkt);

  1197.     }

  1198. }

  1199. 

  1200. static int mpegts_write_end(AVFormatContext *s)

  1201. {

  1202.     MpegTSWrite *ts = s->priv_data;

  1203.     MpegTSService *service;

  1204.     int i;

  1205. 

  1206.     if (s->pb)

  1207.         mpegts_write_flush(s);

  1208. 

  1209.     for (i = 0; i < s->nb_streams; i++) {

  1210.         AVStream *st = s->streams[i];

  1211.         MpegTSWriteStream *ts_st = st->priv_data;

  1212.         av_freep(&ts_st->payload);

  1213.         if (ts_st->amux) {

  1214.             avformat_free_context(ts_st->amux);

  1215.             ts_st->amux = NULL;

  1216.         }

  1217.     }

  1218. 

  1219.     for (i = 0; i < ts->nb_services; i++) {

  1220.         service = ts->services[i];

  1221.         av_freep(&service->provider_name);

  1222.         av_freep(&service->name);

  1223.         av_free(service);

  1224.     }

  1225.     av_free(ts->services);

  1226. 

  1227.     return 0;

  1228. }

  1229. 

  1230. static const AVOption options[] = {

  1231.     { "mpegts_transport_stream_id", "Set transport_stream_id field.",

  1232.       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT,

  1233.       { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },

  1234.     { "mpegts_original_network_id", "Set original_network_id field.",

  1235.       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT,

  1236.       { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },

  1237.     { "mpegts_service_id", "Set service_id field.",

  1238.       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT,

  1239.       { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },

  1240.     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",

  1241.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT,

  1242.       { .i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM },

  1243.     { "mpegts_start_pid", "Set the first pid.",

  1244.       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT,

  1245.       { .i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM },

  1246.     {"mpegts_m2ts_mode", "Enable m2ts mode.",

  1247.       offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT,

  1248.       { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},

  1249.     { "muxrate", NULL,

  1250.       offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT,

  1251.       { .i64 = 1 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

  1252.     { "pes_payload_size", "Minimum PES packet payload in bytes",

  1253.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT,

  1254.       { .i64 = DEFAULT_PES_PAYLOAD_SIZE }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

  1255.     { "mpegts_flags", "MPEG-TS muxing flags",

  1256.       offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, 0, INT_MAX,

  1257.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

  1258.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",

  1259.       0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_REEMIT_PAT_PMT }, 0, INT_MAX,

  1260.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

  1261.     { "latm", "Use LATM packetization for AAC",

  1262.       0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_AAC_LATM }, 0, INT_MAX,

  1263.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

  1264.     { "system_b", "Conform to System B (DVB) instead of System A (ATSC)",

  1265.       0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_SYSTEM_B }, 0, INT_MAX,

  1266.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

  1267.     // backward compatibility

  1268.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",

  1269.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT,

  1270.       { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

  1271.     { "pcr_period", "PCR retransmission time",

  1272.       offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT,

  1273.       { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

  1274.     { NULL },

  1275. };

  1276. 

  1277. static const AVClass mpegts_muxer_class = {

  1278.     .class_name = "MPEGTS muxer",

  1279.     .item_name  = av_default_item_name,

  1280.     .option     = options,

  1281.     .version    = LIBAVUTIL_VERSION_INT,

  1282. };

  1283. 

  1284. AVOutputFormat ff_mpegts_muxer = {

  1285.     .name           = "mpegts",

  1286.     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),

  1287.     .mime_type      = "video/MP2T",

  1288.     .extensions     = "ts,m2t,m2ts,mts",

  1289.     .priv_data_size = sizeof(MpegTSWrite),

  1290.     .audio_codec    = AV_CODEC_ID_MP2,

  1291.     .video_codec    = AV_CODEC_ID_MPEG2VIDEO,

  1292.     .write_header   = mpegts_write_header,

  1293.     .write_packet   = mpegts_write_packet,

  1294.     .write_trailer  = mpegts_write_end,

  1295.     .flags          = AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS,

  1296.     .priv_class     = &mpegts_muxer_class,

  1297. };