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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 FFmpeg.

  6.  *

  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. #include "libavutil/bswap.h"

  23. #include "libavutil/crc.h"

  24. #include "libavutil/dict.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/mathematics.h"

  27. #include "libavutil/opt.h"

  28. #include "libavutil/avassert.h"

  29. #include "libavcodec/internal.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "mpegts.h"

  33. 

  34. #define PCR_TIME_BASE 27000000

  35. 

  36. /* write DVB SI sections */

  37. 

  38. /*********************************************/

  39. /* mpegts section writer */

  40. 

  41. typedef struct MpegTSSection {

  42.     int pid;

  43.     int cc;

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

  45.     void *opaque;

  46. } MpegTSSection;

  47. 

  48. typedef struct MpegTSService {

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

  50.     int sid;           /* service ID */

  51.     char *name;

  52.     char *provider_name;

  53.     int pcr_pid;

  54.     int pcr_packet_count;

  55.     int pcr_packet_period;

  56. } MpegTSService;

  57. 

  58. typedef struct MpegTSWrite {

  59.     const AVClass *av_class;

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

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

  62.     MpegTSService **services;

  63.     int sdt_packet_count;

  64.     int sdt_packet_period;

  65.     int pat_packet_count;

  66.     int pat_packet_period;

  67.     int nb_services;

  68.     int onid;

  69.     int tsid;

  70.     int64_t first_pcr;

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

  72.     int pes_payload_size;

  73. 

  74.     int transport_stream_id;

  75.     int original_network_id;

  76.     int service_id;

  77. 

  78.     int pmt_start_pid;

  79.     int start_pid;

  80.     int m2ts_mode;

  81. 

  82.     int reemit_pat_pmt; // backward compatibility

  83. 

  84. #define MPEGTS_FLAG_REEMIT_PAT_PMT  0x01

  85. #define MPEGTS_FLAG_AAC_LATM        0x02

  86.     int flags;

  87.     int copyts;

  88. } MpegTSWrite;

  89. 

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

  91. #define DEFAULT_PES_HEADER_FREQ 16

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

  93. 

  94. static const AVOption options[] = {

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

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

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

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

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

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

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

  102.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

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

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

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

  106.         offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },

  107.         -1,1, AV_OPT_FLAG_ENCODING_PARAM},

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

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

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

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

  112.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

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

  114.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,

  115.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},

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

  117.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,

  118.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},

  119.     // backward compatibility

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

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

  122.     { "mpegts_copyts", "dont offset dts/pts",

  123.       offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},

  124.     { NULL },

  125. };

  126. 

  127. static const AVClass mpegts_muxer_class = {

  128.     .class_name     = "MPEGTS muxer",

  129.     .item_name      = av_default_item_name,

  130.     .option         = options,

  131.     .version        = LIBAVUTIL_VERSION_INT,

  132. };

  133. 

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

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

  136. {

  137.     unsigned int crc;

  138.     unsigned char packet[TS_PACKET_SIZE];

  139.     const unsigned char *buf_ptr;

  140.     unsigned char *q;

  141.     int first, b, len1, left;

  142. 

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

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

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

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

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

  148. 

  149.     /* send each packet */

  150.     buf_ptr = buf;

  151.     while (len > 0) {

  152.         first = (buf == buf_ptr);

  153.         q = packet;

  154.         *q++ = 0x47;

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

  156.         if (first)

  157.             b |= 0x40;

  158.         *q++ = b;

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

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

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

  162.         if (first)

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

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

  165.         if (len1 > len)

  166.             len1 = len;

  167.         memcpy(q, buf_ptr, len1);

  168.         q += len1;

  169.         /* add known padding data */

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

  171.         if (left > 0)

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

  173. 

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

  175. 

  176.         buf_ptr += len1;

  177.         len -= len1;

  178.     }

  179. }

  180. 

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

  182. {

  183.     uint8_t *q;

  184.     q = *q_ptr;

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

  186.     *q++ = val;

  187.     *q_ptr = q;

  188. }

  189. 

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

  191.                           int version, int sec_num, int last_sec_num,

  192.                           uint8_t *buf, int len)

  193. {

  194.     uint8_t section[1024], *q;

  195.     unsigned int tot_len;

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

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

  198. 

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

  200.     /* check if not too big */

  201.     if (tot_len > 1024)

  202.         return AVERROR_INVALIDDATA;

  203. 

  204.     q = section;

  205.     *q++ = tid;

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

  207.     put16(&q, id);

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

  209.     *q++ = sec_num;

  210.     *q++ = last_sec_num;

  211.     memcpy(q, buf, len);

  212. 

  213.     mpegts_write_section(s, section, tot_len);

  214.     return 0;

  215. }

  216. 

  217. /*********************************************/

  218. /* mpegts writer */

  219. 

  220. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  221. #define DEFAULT_SERVICE_NAME    "Service01"

  222. 

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

  224. #define SDT_RETRANS_TIME 500

  225. #define PAT_RETRANS_TIME 100

  226. #define PCR_RETRANS_TIME 20

  227. 

  228. typedef struct MpegTSWriteStream {

  229.     struct MpegTSService *service;

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

  231.     int cc;

  232.     int payload_size;

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

  234.     int prev_payload_key;

  235.     int64_t payload_pts;

  236.     int64_t payload_dts;

  237.     int payload_flags;

  238.     uint8_t *payload;

  239.     AVFormatContext *amux;

  240. } MpegTSWriteStream;

  241. 

  242. static void mpegts_write_pat(AVFormatContext *s)

  243. {

  244.     MpegTSWrite *ts = s->priv_data;

  245.     MpegTSService *service;

  246.     uint8_t data[1012], *q;

  247.     int i;

  248. 

  249.     q = data;

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

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

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

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

  254.     }

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

  256.                           data, q - data);

  257. }

  258. 

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

  260. {

  261.     MpegTSWrite *ts = s->priv_data;

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

  263.     int val, stream_type, i;

  264. 

  265.     q = data;

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

  267. 

  268.     program_info_length_ptr = q;

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

  270. 

  271.     /* put program info here */

  272. 

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

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

  275.     program_info_length_ptr[1] = val;

  276. 

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

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

  279.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  282.         case AV_CODEC_ID_MPEG1VIDEO:

  283.         case AV_CODEC_ID_MPEG2VIDEO:

  284.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  285.             break;

  286.         case AV_CODEC_ID_MPEG4:

  287.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  288.             break;

  289.         case AV_CODEC_ID_H264:

  290.             stream_type = STREAM_TYPE_VIDEO_H264;

  291.             break;

  292.         case AV_CODEC_ID_CAVS:

  293.             stream_type = STREAM_TYPE_VIDEO_CAVS;

  294.             break;

  295.         case AV_CODEC_ID_DIRAC:

  296.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  297.             break;

  298.         case AV_CODEC_ID_MP2:

  299.         case AV_CODEC_ID_MP3:

  300.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  301.             break;

  302.         case AV_CODEC_ID_AAC:

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

  304.             break;

  305.         case AV_CODEC_ID_AAC_LATM:

  306.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  307.             break;

  308.         case AV_CODEC_ID_AC3:

  309.             stream_type = STREAM_TYPE_AUDIO_AC3;

  310.             break;

  311.         default:

  312.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  313.             break;

  314.         }

  315.         *q++ = stream_type;

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

  317.         desc_length_ptr = q;

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

  319. 

  320.         /* write optional descriptors here */

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

  322.         case AVMEDIA_TYPE_AUDIO:

  323.             if(st->codec->codec_id==AV_CODEC_ID_EAC3){

  324.                 *q++=0x7a; // EAC3 descriptor see A038 DVB SI

  325.                 *q++=1; // 1 byte, all flags sets to 0

  326.                 *q++=0; // omit all fields...

  327.             }

  328.             if(st->codec->codec_id==AV_CODEC_ID_S302M){

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

  330.                 *q++ = 4;

  331.                 *q++ = 'B';

  332.                 *q++ = 'S';

  333.                 *q++ = 'S';

  334.                 *q++ = 'D';

  335.             }

  336. 

  337.             if (lang) {

  338.                 char *p;

  339.                 char *next = lang->value;

  340.                 uint8_t *len_ptr;

  341. 

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

  343.                 len_ptr = q++;

  344.                 *len_ptr = 0;

  345. 

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

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

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

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

  350. 

  351.                     *q++ = *p++;

  352.                     *q++ = *p++;

  353.                     *q++ = *p++;

  354. 

  355.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  356.                     *q++ = 0x01;

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

  358.                     *q++ = 0x02;

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

  360.                     *q++ = 0x03;

  361.                 else

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

  363. 

  364.                     *len_ptr += 4;

  365.                 }

  366. 

  367.                 if (*len_ptr == 0)

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

  369.             }

  370.             break;

  371.         case AVMEDIA_TYPE_SUBTITLE:

  372.             {

  373.                 const char *language;

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

  375.                 *q++ = 0x59;

  376.                 *q++ = 8;

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

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

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

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

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

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

  383.                     q += 4;

  384.                 } else {

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

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

  387.                 }

  388.             }

  389.             break;

  390.         case AVMEDIA_TYPE_VIDEO:

  391.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  393.                 *q++ = 4;

  394.                 *q++ = 'd';

  395.                 *q++ = 'r';

  396.                 *q++ = 'a';

  397.                 *q++ = 'c';

  398.             }

  399.             break;

  400.         case AVMEDIA_TYPE_DATA:

  401.             if (st->codec->codec_id == AV_CODEC_ID_SMPTE_KLV) {

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

  403.                 *q++ = 4;

  404.                 *q++ = 'K';

  405.                 *q++ = 'L';

  406.                 *q++ = 'V';

  407.                 *q++ = 'A';

  408.             }

  409.             break;

  410.         }

  411. 

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

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

  414.         desc_length_ptr[1] = val;

  415.     }

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

  417.                           data, q - data);

  418. }

  419. 

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

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

  422. {

  423.     uint8_t *q;

  424.     int len;

  425. 

  426.     q = *q_ptr;

  427.     if (!str)

  428.         len = 0;

  429.     else

  430.         len = strlen(str);

  431.     *q++ = len;

  432.     memcpy(q, str, len);

  433.     q += len;

  434.     *q_ptr = q;

  435. }

  436. 

  437. static void mpegts_write_sdt(AVFormatContext *s)

  438. {

  439.     MpegTSWrite *ts = s->priv_data;

  440.     MpegTSService *service;

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

  442.     int i, running_status, free_ca_mode, val;

  443. 

  444.     q = data;

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

  446.     *q++ = 0xff;

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

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

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

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

  451.         desc_list_len_ptr = q;

  452.         q += 2;

  453.         running_status = 4; /* running */

  454.         free_ca_mode = 0;

  455. 

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

  457.         *q++ = 0x48;

  458.         desc_len_ptr = q;

  459.         q++;

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

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

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

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

  464. 

  465.         /* fill descriptor length */

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

  467.             (q - desc_list_len_ptr - 2);

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

  469.         desc_list_len_ptr[1] = val;

  470.     }

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

  472.                           data, q - data);

  473. }

  474. 

  475. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  476.                                          int sid,

  477.                                          const char *provider_name,

  478.                                          const char *name)

  479. {

  480.     MpegTSService *service;

  481. 

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

  483.     if (!service)

  484.         return NULL;

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

  486.     service->sid = sid;

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

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

  489.     service->pcr_pid = 0x1fff;

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

  491.     return service;

  492. }

  493. 

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

  495. {

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

  497.            ts->first_pcr;

  498. }

  499. 

  500. static void mpegts_prefix_m2ts_header(AVFormatContext *s)

  501. {

  502.     MpegTSWrite *ts = s->priv_data;

  503.     if (ts->m2ts_mode) {

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

  505.         uint32_t tp_extra_header = pcr % 0x3fffffff;

  506.         tp_extra_header = AV_RB32(&tp_extra_header);

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

  508.                 sizeof(tp_extra_header));

  509.     }

  510. }

  511. 

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

  513. {

  514.     AVFormatContext *ctx = s->opaque;

  515.     mpegts_prefix_m2ts_header(ctx);

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

  517. }

  518. 

  519. static int mpegts_write_header(AVFormatContext *s)

  520. {

  521.     MpegTSWrite *ts = s->priv_data;

  522.     MpegTSWriteStream *ts_st;

  523.     MpegTSService *service;

  524.     AVStream *st, *pcr_st = NULL;

  525.     AVDictionaryEntry *title, *provider;

  526.     int i, j;

  527.     const char *service_name;

  528.     const char *provider_name;

  529.     int *pids;

  530.     int ret;

  531. 

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

  533.         s->max_delay = 0;

  534. 

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

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

  537. 

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

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

  540.     /* allocate a single DVB service */

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

  542.     if (!title)

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

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

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

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

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

  548.     service->pmt.write_packet = section_write_packet;

  549.     service->pmt.opaque = s;

  550.     service->pmt.cc = 15;

  551. 

  552.     ts->pat.pid = PAT_PID;

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

  554.     ts->pat.write_packet = section_write_packet;

  555.     ts->pat.opaque = s;

  556. 

  557.     ts->sdt.pid = SDT_PID;

  558.     ts->sdt.cc = 15;

  559.     ts->sdt.write_packet = section_write_packet;

  560.     ts->sdt.opaque = s;

  561. 

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

  563.     if (!pids)

  564.         return AVERROR(ENOMEM);

  565. 

  566.     /* assign pids to each stream */

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

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

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

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

  571.         if (!ts_st) {

  572.             ret = AVERROR(ENOMEM);

  573.             goto fail;

  574.         }

  575.         st->priv_data = ts_st;

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

  577.         if (!ts_st->payload) {

  578.             ret = AVERROR(ENOMEM);

  579.             goto fail;

  580.         }

  581.         ts_st->service = service;

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

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

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

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

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

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

  588.         } else {

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

  590.             ret = AVERROR(EINVAL);

  591.             goto fail;

  592.         }

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

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

  595.             ret = AVERROR(EINVAL);

  596.             goto fail;

  597.         }

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

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

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

  601.                 ret = AVERROR(EINVAL);

  602.                 goto fail;

  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.         {

  618.             AVStream *ast;

  619.             ts_st->amux = avformat_alloc_context();

  620.             if (!ts_st->amux) {

  621.                 ret = AVERROR(ENOMEM);

  622.                 goto fail;

  623.             }

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

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

  626.                 ret = AVERROR(EINVAL);

  627.                 goto fail;

  628.             }

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

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

  631.             if (ret != 0)

  632.                 goto fail;

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

  634.             if (ret < 0)

  635.                 goto fail;

  636.         }

  637.     }

  638. 

  639.     av_free(pids);

  640. 

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

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

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

  644.         ts_st = pcr_st->priv_data;

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

  646.     }

  647. 

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

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

  650.             (TS_PACKET_SIZE * 8 * 1000);

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

  652.             (TS_PACKET_SIZE * 8 * 1000);

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

  654.             (TS_PACKET_SIZE * 8 * 1000);

  655. 

  656.         if(ts->copyts < 1)

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

  658.     } else {

  659.         /* Arbitrary values, PAT/PMT will also be written on video key frames */

  660.         ts->sdt_packet_period = 200;

  661.         ts->pat_packet_period = 40;

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

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

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

  665.                 service->pcr_packet_period =

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

  667.             } else {

  668.                 service->pcr_packet_period =

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

  670.             }

  671.         } else {

  672.             // max delta PCR 0.1s

  673.             service->pcr_packet_period =

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

  675.         }

  676.         if(!service->pcr_packet_period)

  677.             service->pcr_packet_period = 1;

  678.     }

  679. 

  680.     // output a PCR as soon as possible

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

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

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

  684. 

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

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

  687.     else

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

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

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

  691.            service->pcr_packet_period,

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

  693. 

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

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

  696.             ts->m2ts_mode = 1;

  697.         } else {

  698.             ts->m2ts_mode = 0;

  699.         }

  700.     }

  701. 

  702.     avio_flush(s->pb);

  703. 

  704.     return 0;

  705. 

  706.  fail:

  707.     av_free(pids);

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

  709.         MpegTSWriteStream *ts_st;

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

  711.         ts_st = st->priv_data;

  712.         if (ts_st) {

  713.             av_freep(&ts_st->payload);

  714.             if (ts_st->amux) {

  715.                 avformat_free_context(ts_st->amux);

  716.                 ts_st->amux = NULL;

  717.             }

  718.         }

  719.         av_freep(&st->priv_data);

  720.     }

  721.     return ret;

  722. }

  723. 

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

  725. static void retransmit_si_info(AVFormatContext *s, int force_pat)

  726. {

  727.     MpegTSWrite *ts = s->priv_data;

  728.     int i;

  729. 

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

  731.         ts->sdt_packet_count = 0;

  732.         mpegts_write_sdt(s);

  733.     }

  734.     if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {

  735.         ts->pat_packet_count = 0;

  736.         mpegts_write_pat(s);

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

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

  739.         }

  740.     }

  741. }

  742. 

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

  744. {

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

  746. 

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

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

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

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

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

  752.     *buf++ = pcr_low;

  753. 

  754.     return 6;

  755. }

  756. 

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

  758. static void mpegts_insert_null_packet(AVFormatContext *s)

  759. {

  760.     uint8_t *q;

  761.     uint8_t buf[TS_PACKET_SIZE];

  762. 

  763.     q = buf;

  764.     *q++ = 0x47;

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

  766.     *q++ = 0xff;

  767.     *q++ = 0x10;

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

  769.     mpegts_prefix_m2ts_header(s);

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

  771. }

  772. 

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

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

  775. {

  776.     MpegTSWrite *ts = s->priv_data;

  777.     MpegTSWriteStream *ts_st = st->priv_data;

  778.     uint8_t *q;

  779.     uint8_t buf[TS_PACKET_SIZE];

  780. 

  781.     q = buf;

  782.     *q++ = 0x47;

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

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

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

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

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

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

  789. 

  790.     /* PCR coded into 6 bytes */

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

  792. 

  793.     /* stuffing bytes */

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

  795.     mpegts_prefix_m2ts_header(s);

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

  797. }

  798. 

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

  800. {

  801.     int val;

  802. 

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

  804.     *q++ = val;

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

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

  807.     *q++ = val;

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

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

  810.     *q++ = val;

  811. }

  812. 

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

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

  815. {

  816.     // expect at least one flag to set

  817.     av_assert0(flag);

  818. 

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

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

  821.         pkt[3] |= 0x20;

  822.         // 1 byte length, no flags

  823.         pkt[4] = 1;

  824.         pkt[5] = 0;

  825.     }

  826.     pkt[5] |= flag;

  827. }

  828. 

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

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

  831. {

  832.     // expect already existing adaptation field

  833.     av_assert0(pkt[3] & 0x20);

  834.     pkt[4] += size;

  835. }

  836. 

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

  838. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  839. {

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

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

  842.     else

  843.         return pkt + 4;

  844. }

  845. 

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

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

  848.  * to exactly fill the last ts packet.

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

  850.  */

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

  852.                              const uint8_t *payload, int payload_size,

  853.                              int64_t pts, int64_t dts, int key)

  854. {

  855.     MpegTSWriteStream *ts_st = st->priv_data;

  856.     MpegTSWrite *ts = s->priv_data;

  857.     uint8_t buf[TS_PACKET_SIZE];

  858.     uint8_t *q;

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

  860.     int afc_len, stuffing_len;

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

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

  863.     int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;

  864. 

  865.     is_start = 1;

  866.     while (payload_size > 0) {

  867.         retransmit_si_info(s, force_pat);

  868.         force_pat = 0;

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

  889.         }

  890. 

  891.         /* prepare packet header */

  892.         q = buf;

  893.         *q++ = 0x47;

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

  895.         if (is_start)

  896.             val |= 0x40;

  897.         *q++ = val;

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

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

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

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

  902.             // set Random Access for key frames

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

  904.                 write_pcr = 1;

  905.             set_af_flag(buf, 0x40);

  906.             q = get_ts_payload_start(buf);

  907.         }

  908.         if (write_pcr) {

  909.             set_af_flag(buf, 0x10);

  910.             q = get_ts_payload_start(buf);

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

  912.             if (ts->mux_rate > 1)

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

  914.             else

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

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

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

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

  919.             q = get_ts_payload_start(buf);

  920.         }

  921.         if (is_start) {

  922.             int pes_extension = 0;

  923.             /* write PES header */

  924.             *q++ = 0x00;

  925.             *q++ = 0x00;

  926.             *q++ = 0x01;

  927.             private_code = 0;

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

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

  930.                     *q++ = 0xfd;

  931.                 } else

  932.                     *q++ = 0xe0;

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

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

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

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

  937.                 *q++ = 0xc0;

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

  939.                         st->codec->codec_id == AV_CODEC_ID_AC3 &&

  940.                         ts->m2ts_mode) {

  941.                 *q++ = 0xfd;

  942.             } else {

  943.                 *q++ = 0xbd;

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

  945.                     private_code = 0x20;

  946.                 }

  947.             }

  948.             header_len = 0;

  949.             flags = 0;

  950.             if (pts != AV_NOPTS_VALUE) {

  951.                 header_len += 5;

  952.                 flags |= 0x80;

  953.             }

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

  955.                 header_len += 5;

  956.                 flags |= 0x40;

  957.             }

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

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

  960.                 /* set PES_extension_flag */

  961.                 pes_extension = 1;

  962.                 flags |= 0x01;

  963. 

  964.                 /*

  965.                 * One byte for PES2 extension flag +

  966.                 * one byte for extension length +

  967.                 * one byte for extension id

  968.                 */

  969.                 header_len += 3;

  970.             }

  971.             /* for Blu-ray AC3 Audio the PES Extension flag should be as follow

  972.              * otherwise it will not play sound on blu-ray

  973.              */

  974.             if (ts->m2ts_mode &&

  975.                 st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  976.                 st->codec->codec_id == AV_CODEC_ID_AC3) {

  977.                         /* set PES_extension_flag */

  978.                         pes_extension = 1;

  979.                         flags |= 0x01;

  980.                         header_len += 3;

  981.             }

  982.             len = payload_size + header_len + 3;

  983.             if (private_code != 0)

  984.                 len++;

  985.             if (len > 0xffff)

  986.                 len = 0;

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

  988.             *q++ = len;

  989.             val = 0x80;

  990.             /* data alignment indicator is required for subtitle and data streams */

  991.             if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codec->codec_type == AVMEDIA_TYPE_DATA)

  992.                 val |= 0x04;

  993.             *q++ = val;

  994.             *q++ = flags;

  995.             *q++ = header_len;

  996.             if (pts != AV_NOPTS_VALUE) {

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

  998.                 q += 5;

  999.             }

  1000.             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {

  1001.                 write_pts(q, 1, dts);

  1002.                 q += 5;

  1003.             }

  1004.             if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {

  1005.                 flags = 0x01;  /* set PES_extension_flag_2 */

  1006.                 *q++ = flags;

  1007.                 *q++ = 0x80 | 0x01;  /* marker bit + extension length */

  1008.                 /*

  1009.                 * Set the stream id extension flag bit to 0 and

  1010.                 * write the extended stream id

  1011.                 */

  1012.                 *q++ = 0x00 | 0x60;

  1013.             }

  1014.             /* For Blu-ray AC3 Audio Setting extended flags */

  1015.           if (ts->m2ts_mode &&

  1016.               pes_extension &&

  1017.               st->codec->codec_id == AV_CODEC_ID_AC3) {

  1018.                       flags = 0x01; /* set PES_extension_flag_2 */

  1019.                       *q++ = flags;

  1020.                       *q++ = 0x80 | 0x01; /* marker bit + extension length */

  1021.                       *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */

  1022.               }

  1023. 

  1024. 

  1025.             if (private_code != 0)

  1026.                 *q++ = private_code;

  1027.             is_start = 0;

  1028.         }

  1029.         /* header size */

  1030.         header_len = q - buf;

  1031.         /* data len */

  1032.         len = TS_PACKET_SIZE - header_len;

  1033.         if (len > payload_size)

  1034.             len = payload_size;

  1035.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  1036.         if (stuffing_len > 0) {

  1037.             /* add stuffing with AFC */

  1038.             if (buf[3] & 0x20) {

  1039.                 /* stuffing already present: increase its size */

  1040.                 afc_len = buf[4] + 1;

  1041.                 memmove(buf + 4 + afc_len + stuffing_len,

  1042.                         buf + 4 + afc_len,

  1043.                         header_len - (4 + afc_len));

  1044.                 buf[4] += stuffing_len;

  1045.                 memset(buf + 4 + afc_len, 0xff, stuffing_len);

  1046.             } else {

  1047.                 /* add stuffing */

  1048.                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);

  1049.                 buf[3] |= 0x20;

  1050.                 buf[4] = stuffing_len - 1;

  1051.                 if (stuffing_len >= 2) {

  1052.                     buf[5] = 0x00;

  1053.                     memset(buf + 6, 0xff, stuffing_len - 2);

  1054.                 }

  1055.             }

  1056.         }

  1057.         memcpy(buf + TS_PACKET_SIZE - len, payload, len);

  1058.         payload += len;

  1059.         payload_size -= len;

  1060.         mpegts_prefix_m2ts_header(s);

  1061.         avio_write(s->pb, buf, TS_PACKET_SIZE);

  1062.     }

  1063.     avio_flush(s->pb);

  1064.     ts_st->prev_payload_key = key;

  1065. }

  1066. 

  1067. static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)

  1068. {

  1069.     AVStream *st = s->streams[pkt->stream_index];

  1070.     int size = pkt->size;

  1071.     uint8_t *buf= pkt->data;

  1072.     uint8_t *data= NULL;

  1073.     MpegTSWrite *ts = s->priv_data;

  1074.     MpegTSWriteStream *ts_st = st->priv_data;

  1075.     const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;

  1076.     int64_t dts = pkt->dts, pts = pkt->pts;

  1077. 

  1078.     if (ts->reemit_pat_pmt) {

  1079.         av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");

  1080.         ts->reemit_pat_pmt = 0;

  1081.         ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;

  1082.     }

  1083. 

  1084.     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {

  1085.         ts->pat_packet_count = ts->pat_packet_period - 1;

  1086.         ts->sdt_packet_count = ts->sdt_packet_period - 1;

  1087.         ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;

  1088.     }

  1089. 

  1090.     if(ts->copyts < 1){

  1091.         if (pts != AV_NOPTS_VALUE)

  1092.             pts += delay;

  1093.         if (dts != AV_NOPTS_VALUE)

  1094.             dts += delay;

  1095.     }

  1096. 

  1097.     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {

  1098.         av_log(s, AV_LOG_ERROR, "first pts value must be set\n");

  1099.         return AVERROR_INVALIDDATA;

  1100.     }

  1101.     ts_st->first_pts_check = 0;

  1102. 

  1103.     if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1104.         const uint8_t *p = buf, *buf_end = p+size;

  1105.         uint32_t state = -1;

  1106. 

  1107.         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {

  1108.             if (!st->nb_frames) {

  1109.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "

  1110.                    "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");

  1111.             return AVERROR(EINVAL);

  1112.             }

  1113.             av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing\n");

  1114.         }

  1115. 

  1116.         do {

  1117.             p = avpriv_find_start_code(p, buf_end, &state);

  1118.             av_dlog(s, "nal %d\n", state & 0x1f);

  1119.         } while (p < buf_end && (state & 0x1f) != 9 &&

  1120.                  (state & 0x1f) != 5 && (state & 0x1f) != 1);

  1121. 

  1122.         if ((state & 0x1f) != 9) { // AUD NAL

  1123.             data = av_malloc(pkt->size+6);

  1124.             if (!data)

  1125.                 return AVERROR(ENOMEM);

  1126.             memcpy(data+6, pkt->data, pkt->size);

  1127.             AV_WB32(data, 0x00000001);

  1128.             data[4] = 0x09;

  1129.             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit

  1130.             buf  = data;

  1131.             size = pkt->size+6;

  1132.         }

  1133.     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {

  1134.         if (pkt->size < 2) {

  1135.             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");

  1136.             return AVERROR_INVALIDDATA;

  1137.         }

  1138.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {

  1139.             int ret;

  1140.             AVPacket pkt2;

  1141. 

  1142.             if (!ts_st->amux) {

  1143.                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "

  1144.                        "and extradata missing\n");

  1145.                 return AVERROR_INVALIDDATA;

  1146.             }

  1147. 

  1148.             av_init_packet(&pkt2);

  1149.             pkt2.data = pkt->data;

  1150.             pkt2.size = pkt->size;

  1151.             ret = avio_open_dyn_buf(&ts_st->amux->pb);

  1152.             if (ret < 0)

  1153.                 return AVERROR(ENOMEM);

  1154. 

  1155.             ret = av_write_frame(ts_st->amux, &pkt2);

  1156.             if (ret < 0) {

  1157.                 avio_close_dyn_buf(ts_st->amux->pb, &data);

  1158.                 ts_st->amux->pb = NULL;

  1159.                 av_free(data);

  1160.                 return ret;

  1161.             }

  1162.             size = avio_close_dyn_buf(ts_st->amux->pb, &data);

  1163.             ts_st->amux->pb = NULL;

  1164.             buf = data;

  1165.         }

  1166.     }

  1167. 

  1168.     if (pkt->dts != AV_NOPTS_VALUE) {

  1169.         int i;

  1170.         for(i=0; i<s->nb_streams; i++){

  1171.             AVStream *st2 = s->streams[i];

  1172.             MpegTSWriteStream *ts_st2 = st2->priv_data;

  1173.             if(   ts_st2->payload_size

  1174.                && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){

  1175.                 mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,

  1176.                                 ts_st2->payload_pts, ts_st2->payload_dts,

  1177.                                 ts_st2->payload_flags & AV_PKT_FLAG_KEY);

  1178.                 ts_st2->payload_size = 0;

  1179.             }

  1180.         }

  1181.     }

  1182. 

  1183.     if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {

  1184.         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1185.                          ts_st->payload_pts, ts_st->payload_dts,

  1186.                          ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1187.         ts_st->payload_size = 0;

  1188.     }

  1189. 

  1190.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {

  1191.         av_assert0(!ts_st->payload_size);

  1192.         // for video and subtitle, write a single pes packet

  1193.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1194.         av_free(data);

  1195.         return 0;

  1196.     }

  1197. 

  1198.     if (!ts_st->payload_size) {

  1199.         ts_st->payload_pts = pts;

  1200.         ts_st->payload_dts = dts;

  1201.         ts_st->payload_flags = pkt->flags;

  1202.     }

  1203. 

  1204.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1205.     ts_st->payload_size += size;

  1206. 

  1207.     av_free(data);

  1208. 

  1209.     return 0;

  1210. }

  1211. 

  1212. static void mpegts_write_flush(AVFormatContext *s)

  1213. {

  1214.     int i;

  1215. 

  1216.     /* flush current packets */

  1217.     for(i = 0; i < s->nb_streams; i++) {

  1218.         AVStream *st = s->streams[i];

  1219.         MpegTSWriteStream *ts_st = st->priv_data;

  1220.         if (ts_st->payload_size > 0) {

  1221.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1222.                              ts_st->payload_pts, ts_st->payload_dts,

  1223.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1224.             ts_st->payload_size = 0;

  1225.         }

  1226.     }

  1227.     avio_flush(s->pb);

  1228. }

  1229. 

  1230. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)

  1231. {

  1232.     if (!pkt) {

  1233.         mpegts_write_flush(s);

  1234.         return 1;

  1235.     } else {

  1236.         return mpegts_write_packet_internal(s, pkt);

  1237.     }

  1238. }

  1239. 

  1240. static int mpegts_write_end(AVFormatContext *s)

  1241. {

  1242.     MpegTSWrite *ts = s->priv_data;

  1243.     MpegTSService *service;

  1244.     int i;

  1245. 

  1246.     mpegts_write_flush(s);

  1247. 

  1248.     for(i = 0; i < s->nb_streams; i++) {

  1249.         AVStream *st = s->streams[i];

  1250.         MpegTSWriteStream *ts_st = st->priv_data;

  1251.         av_freep(&ts_st->payload);

  1252.         if (ts_st->amux) {

  1253.             avformat_free_context(ts_st->amux);

  1254.             ts_st->amux = NULL;

  1255.         }

  1256.     }

  1257. 

  1258.     for(i = 0; i < ts->nb_services; i++) {

  1259.         service = ts->services[i];

  1260.         av_freep(&service->provider_name);

  1261.         av_freep(&service->name);

  1262.         av_free(service);

  1263.     }

  1264.     av_free(ts->services);

  1265. 

  1266.     return 0;

  1267. }

  1268. 

  1269. AVOutputFormat ff_mpegts_muxer = {

  1270.     .name              = "mpegts",

  1271.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),

  1272.     .mime_type         = "video/x-mpegts",

  1273.     .extensions        = "ts,m2t,m2ts,mts",

  1274.     .priv_data_size    = sizeof(MpegTSWrite),

  1275.     .audio_codec       = AV_CODEC_ID_MP2,

  1276.     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,

  1277.     .write_header      = mpegts_write_header,

  1278.     .write_packet      = mpegts_write_packet,

  1279.     .write_trailer     = mpegts_write_end,

  1280.     .flags             = AVFMT_ALLOW_FLUSH,

  1281.     .priv_class        = &mpegts_muxer_class,

  1282. };