Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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.     int tables_version;
  89. } MpegTSWrite;
  90.  
  91. /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
  92. #define DEFAULT_PES_HEADER_FREQ 16
  93. #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
  94.  
  95. static const AVOption options[] = {
  96.     { "mpegts_transport_stream_id", "Set transport_stream_id field.",
  97.       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
  98.     { "mpegts_original_network_id", "Set original_network_id field.",
  99.       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
  100.     { "mpegts_service_id", "Set service_id field.",
  101.       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
  102.     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
  103.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
  104.     { "mpegts_start_pid", "Set the first pid.",
  105.       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
  106.     {"mpegts_m2ts_mode", "Enable m2ts mode.",
  107.         offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },
  108.         -1,1, AV_OPT_FLAG_ENCODING_PARAM},
  109.     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
  110.     { "pes_payload_size", "Minimum PES packet payload in bytes",
  111.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
  112.     { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
  113.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
  114.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",
  115.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
  116.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
  117.     { "latm", "Use LATM packetization for AAC",
  118.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
  119.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
  120.     // backward compatibility
  121.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",
  122.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
  123.     { "mpegts_copyts", "don't offset dts/pts",
  124.       offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
  125.     { "tables_version", "set PAT, PMT and SDT version",
  126.       offsetof(MpegTSWrite, tables_version), AV_OPT_TYPE_INT, {.i64=0}, 0, 31, AV_OPT_FLAG_ENCODING_PARAM},
  127.     { NULL },
  128. };
  129.  
  130. static const AVClass mpegts_muxer_class = {
  131.     .class_name     = "MPEGTS muxer",
  132.     .item_name      = av_default_item_name,
  133.     .option         = options,
  134.     .version        = LIBAVUTIL_VERSION_INT,
  135. };
  136.  
  137. /* NOTE: 4 bytes must be left at the end for the crc32 */
  138. static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
  139. {
  140.     unsigned int crc;
  141.     unsigned char packet[TS_PACKET_SIZE];
  142.     const unsigned char *buf_ptr;
  143.     unsigned char *q;
  144.     int first, b, len1, left;
  145.  
  146.     crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
  147.     buf[len - 4] = (crc >> 24) & 0xff;
  148.     buf[len - 3] = (crc >> 16) & 0xff;
  149.     buf[len - 2] = (crc >> 8) & 0xff;
  150.     buf[len - 1] = (crc) & 0xff;
  151.  
  152.     /* send each packet */
  153.     buf_ptr = buf;
  154.     while (len > 0) {
  155.         first = (buf == buf_ptr);
  156.         q = packet;
  157.         *q++ = 0x47;
  158.         b = (s->pid >> 8);
  159.         if (first)
  160.             b |= 0x40;
  161.         *q++ = b;
  162.         *q++ = s->pid;
  163.         s->cc = (s->cc + 1) & 0xf;
  164.         *q++ = 0x10 | s->cc;
  165.         if (first)
  166.             *q++ = 0; /* 0 offset */
  167.         len1 = TS_PACKET_SIZE - (q - packet);
  168.         if (len1 > len)
  169.             len1 = len;
  170.         memcpy(q, buf_ptr, len1);
  171.         q += len1;
  172.         /* add known padding data */
  173.         left = TS_PACKET_SIZE - (q - packet);
  174.         if (left > 0)
  175.             memset(q, 0xff, left);
  176.  
  177.         s->write_packet(s, packet);
  178.  
  179.         buf_ptr += len1;
  180.         len -= len1;
  181.     }
  182. }
  183.  
  184. static inline void put16(uint8_t **q_ptr, int val)
  185. {
  186.     uint8_t *q;
  187.     q = *q_ptr;
  188.     *q++ = val >> 8;
  189.     *q++ = val;
  190.     *q_ptr = q;
  191. }
  192.  
  193. static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
  194.                           int version, int sec_num, int last_sec_num,
  195.                           uint8_t *buf, int len)
  196. {
  197.     uint8_t section[1024], *q;
  198.     unsigned int tot_len;
  199.     /* reserved_future_use field must be set to 1 for SDT */
  200.     unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
  201.  
  202.     tot_len = 3 + 5 + len + 4;
  203.     /* check if not too big */
  204.     if (tot_len > 1024)
  205.         return AVERROR_INVALIDDATA;
  206.  
  207.     q = section;
  208.     *q++ = tid;
  209.     put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
  210.     put16(&q, id);
  211.     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
  212.     *q++ = sec_num;
  213.     *q++ = last_sec_num;
  214.     memcpy(q, buf, len);
  215.  
  216.     mpegts_write_section(s, section, tot_len);
  217.     return 0;
  218. }
  219.  
  220. /*********************************************/
  221. /* mpegts writer */
  222.  
  223. #define DEFAULT_PROVIDER_NAME   "FFmpeg"
  224. #define DEFAULT_SERVICE_NAME    "Service01"
  225.  
  226. /* we retransmit the SI info at this rate */
  227. #define SDT_RETRANS_TIME 500
  228. #define PAT_RETRANS_TIME 100
  229. #define PCR_RETRANS_TIME 20
  230.  
  231. typedef struct MpegTSWriteStream {
  232.     struct MpegTSService *service;
  233.     int pid; /* stream associated pid */
  234.     int cc;
  235.     int payload_size;
  236.     int first_pts_check; ///< first pts check needed
  237.     int prev_payload_key;
  238.     int64_t payload_pts;
  239.     int64_t payload_dts;
  240.     int payload_flags;
  241.     uint8_t *payload;
  242.     AVFormatContext *amux;
  243. } MpegTSWriteStream;
  244.  
  245. static void mpegts_write_pat(AVFormatContext *s)
  246. {
  247.     MpegTSWrite *ts = s->priv_data;
  248.     MpegTSService *service;
  249.     uint8_t data[1012], *q;
  250.     int i;
  251.  
  252.     q = data;
  253.     for(i = 0; i < ts->nb_services; i++) {
  254.         service = ts->services[i];
  255.         put16(&q, service->sid);
  256.         put16(&q, 0xe000 | service->pmt.pid);
  257.     }
  258.     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, ts->tables_version, 0, 0,
  259.                           data, q - data);
  260. }
  261.  
  262. static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
  263. {
  264.     MpegTSWrite *ts = s->priv_data;
  265.     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
  266.     int val, stream_type, i;
  267.  
  268.     q = data;
  269.     put16(&q, 0xe000 | service->pcr_pid);
  270.  
  271.     program_info_length_ptr = q;
  272.     q += 2; /* patched after */
  273.  
  274.     /* put program info here */
  275.  
  276.     val = 0xf000 | (q - program_info_length_ptr - 2);
  277.     program_info_length_ptr[0] = val >> 8;
  278.     program_info_length_ptr[1] = val;
  279.  
  280.     for(i = 0; i < s->nb_streams; i++) {
  281.         AVStream *st = s->streams[i];
  282.         MpegTSWriteStream *ts_st = st->priv_data;
  283.         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
  284.         switch(st->codec->codec_id) {
  285.         case AV_CODEC_ID_MPEG1VIDEO:
  286.         case AV_CODEC_ID_MPEG2VIDEO:
  287.             stream_type = STREAM_TYPE_VIDEO_MPEG2;
  288.             break;
  289.         case AV_CODEC_ID_MPEG4:
  290.             stream_type = STREAM_TYPE_VIDEO_MPEG4;
  291.             break;
  292.         case AV_CODEC_ID_H264:
  293.             stream_type = STREAM_TYPE_VIDEO_H264;
  294.             break;
  295.         case AV_CODEC_ID_CAVS:
  296.             stream_type = STREAM_TYPE_VIDEO_CAVS;
  297.             break;
  298.         case AV_CODEC_ID_DIRAC:
  299.             stream_type = STREAM_TYPE_VIDEO_DIRAC;
  300.             break;
  301.         case AV_CODEC_ID_MP2:
  302.         case AV_CODEC_ID_MP3:
  303.             stream_type = STREAM_TYPE_AUDIO_MPEG1;
  304.             break;
  305.         case AV_CODEC_ID_AAC:
  306.             stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
  307.             break;
  308.         case AV_CODEC_ID_AAC_LATM:
  309.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
  310.             break;
  311.         case AV_CODEC_ID_AC3:
  312.             stream_type = STREAM_TYPE_AUDIO_AC3;
  313.             break;
  314.         default:
  315.             stream_type = STREAM_TYPE_PRIVATE_DATA;
  316.             break;
  317.         }
  318.         *q++ = stream_type;
  319.         put16(&q, 0xe000 | ts_st->pid);
  320.         desc_length_ptr = q;
  321.         q += 2; /* patched after */
  322.  
  323.         /* write optional descriptors here */
  324.         switch(st->codec->codec_type) {
  325.         case AVMEDIA_TYPE_AUDIO:
  326.             if(st->codec->codec_id==AV_CODEC_ID_EAC3){
  327.                 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
  328.                 *q++=1; // 1 byte, all flags sets to 0
  329.                 *q++=0; // omit all fields...
  330.             }
  331.             if(st->codec->codec_id==AV_CODEC_ID_S302M){
  332.                 *q++ = 0x05; /* MPEG-2 registration descriptor*/
  333.                 *q++ = 4;
  334.                 *q++ = 'B';
  335.                 *q++ = 'S';
  336.                 *q++ = 'S';
  337.                 *q++ = 'D';
  338.             }
  339.  
  340.             if (lang) {
  341.                 char *p;
  342.                 char *next = lang->value;
  343.                 uint8_t *len_ptr;
  344.  
  345.                 *q++ = 0x0a; /* ISO 639 language descriptor */
  346.                 len_ptr = q++;
  347.                 *len_ptr = 0;
  348.  
  349.                 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
  350.                     next = strchr(p, ',');
  351.                     if (strlen(p) != 3 && (!next || next != p + 3))
  352.                         continue; /* not a 3-letter code */
  353.  
  354.                     *q++ = *p++;
  355.                     *q++ = *p++;
  356.                     *q++ = *p++;
  357.  
  358.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
  359.                     *q++ = 0x01;
  360.                 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
  361.                     *q++ = 0x02;
  362.                 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
  363.                     *q++ = 0x03;
  364.                 else
  365.                     *q++ = 0; /* undefined type */
  366.  
  367.                     *len_ptr += 4;
  368.                 }
  369.  
  370.                 if (*len_ptr == 0)
  371.                     q -= 2; /* no language codes were written */
  372.             }
  373.             break;
  374.         case AVMEDIA_TYPE_SUBTITLE:
  375.             {
  376.                 const char *language;
  377.                 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
  378.                 *q++ = 0x59;
  379.                 *q++ = 8;
  380.                 *q++ = language[0];
  381.                 *q++ = language[1];
  382.                 *q++ = language[2];
  383.                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
  384.                 if(st->codec->extradata_size == 4) {
  385.                     memcpy(q, st->codec->extradata, 4);
  386.                     q += 4;
  387.                 } else {
  388.                     put16(&q, 1); /* page id */
  389.                     put16(&q, 1); /* ancillary page id */
  390.                 }
  391.             }
  392.             break;
  393.         case AVMEDIA_TYPE_VIDEO:
  394.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
  395.                 *q++ = 0x05; /*MPEG-2 registration descriptor*/
  396.                 *q++ = 4;
  397.                 *q++ = 'd';
  398.                 *q++ = 'r';
  399.                 *q++ = 'a';
  400.                 *q++ = 'c';
  401.             }
  402.             break;
  403.         case AVMEDIA_TYPE_DATA:
  404.             if (st->codec->codec_id == AV_CODEC_ID_SMPTE_KLV) {
  405.                 *q++ = 0x05; /* MPEG-2 registration descriptor */
  406.                 *q++ = 4;
  407.                 *q++ = 'K';
  408.                 *q++ = 'L';
  409.                 *q++ = 'V';
  410.                 *q++ = 'A';
  411.             }
  412.             break;
  413.         }
  414.  
  415.         val = 0xf000 | (q - desc_length_ptr - 2);
  416.         desc_length_ptr[0] = val >> 8;
  417.         desc_length_ptr[1] = val;
  418.     }
  419.     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0,
  420.                           data, q - data);
  421. }
  422.  
  423. /* NOTE: str == NULL is accepted for an empty string */
  424. static void putstr8(uint8_t **q_ptr, const char *str)
  425. {
  426.     uint8_t *q;
  427.     int len;
  428.  
  429.     q = *q_ptr;
  430.     if (!str)
  431.         len = 0;
  432.     else
  433.         len = strlen(str);
  434.     *q++ = len;
  435.     memcpy(q, str, len);
  436.     q += len;
  437.     *q_ptr = q;
  438. }
  439.  
  440. static void mpegts_write_sdt(AVFormatContext *s)
  441. {
  442.     MpegTSWrite *ts = s->priv_data;
  443.     MpegTSService *service;
  444.     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
  445.     int i, running_status, free_ca_mode, val;
  446.  
  447.     q = data;
  448.     put16(&q, ts->onid);
  449.     *q++ = 0xff;
  450.     for(i = 0; i < ts->nb_services; i++) {
  451.         service = ts->services[i];
  452.         put16(&q, service->sid);
  453.         *q++ = 0xfc | 0x00; /* currently no EIT info */
  454.         desc_list_len_ptr = q;
  455.         q += 2;
  456.         running_status = 4; /* running */
  457.         free_ca_mode = 0;
  458.  
  459.         /* write only one descriptor for the service name and provider */
  460.         *q++ = 0x48;
  461.         desc_len_ptr = q;
  462.         q++;
  463.         *q++ = 0x01; /* digital television service */
  464.         putstr8(&q, service->provider_name);
  465.         putstr8(&q, service->name);
  466.         desc_len_ptr[0] = q - desc_len_ptr - 1;
  467.  
  468.         /* fill descriptor length */
  469.         val = (running_status << 13) | (free_ca_mode << 12) |
  470.             (q - desc_list_len_ptr - 2);
  471.         desc_list_len_ptr[0] = val >> 8;
  472.         desc_list_len_ptr[1] = val;
  473.     }
  474.     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, ts->tables_version, 0, 0,
  475.                           data, q - data);
  476. }
  477.  
  478. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
  479.                                          int sid,
  480.                                          const char *provider_name,
  481.                                          const char *name)
  482. {
  483.     MpegTSService *service;
  484.  
  485.     service = av_mallocz(sizeof(MpegTSService));
  486.     if (!service)
  487.         return NULL;
  488.     service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
  489.     service->sid = sid;
  490.     service->provider_name = av_strdup(provider_name);
  491.     service->name = av_strdup(name);
  492.     service->pcr_pid = 0x1fff;
  493.     dynarray_add(&ts->services, &ts->nb_services, service);
  494.     return service;
  495. }
  496.  
  497. static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
  498. {
  499.     return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
  500.            ts->first_pcr;
  501. }
  502.  
  503. static void mpegts_prefix_m2ts_header(AVFormatContext *s)
  504. {
  505.     MpegTSWrite *ts = s->priv_data;
  506.     if (ts->m2ts_mode) {
  507.         int64_t pcr = get_pcr(s->priv_data, s->pb);
  508.         uint32_t tp_extra_header = pcr % 0x3fffffff;
  509.         tp_extra_header = AV_RB32(&tp_extra_header);
  510.         avio_write(s->pb, (unsigned char *) &tp_extra_header,
  511.                 sizeof(tp_extra_header));
  512.     }
  513. }
  514.  
  515. static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
  516. {
  517.     AVFormatContext *ctx = s->opaque;
  518.     mpegts_prefix_m2ts_header(ctx);
  519.     avio_write(ctx->pb, packet, TS_PACKET_SIZE);
  520. }
  521.  
  522. static int mpegts_write_header(AVFormatContext *s)
  523. {
  524.     MpegTSWrite *ts = s->priv_data;
  525.     MpegTSWriteStream *ts_st;
  526.     MpegTSService *service;
  527.     AVStream *st, *pcr_st = NULL;
  528.     AVDictionaryEntry *title, *provider;
  529.     int i, j;
  530.     const char *service_name;
  531.     const char *provider_name;
  532.     int *pids;
  533.     int ret;
  534.  
  535.     if (s->max_delay < 0) /* Not set by the caller */
  536.         s->max_delay = 0;
  537.  
  538.     // round up to a whole number of TS packets
  539.     ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
  540.  
  541.     ts->tsid = ts->transport_stream_id;
  542.     ts->onid = ts->original_network_id;
  543.     /* allocate a single DVB service */
  544.     title = av_dict_get(s->metadata, "service_name", NULL, 0);
  545.     if (!title)
  546.         title = av_dict_get(s->metadata, "title", NULL, 0);
  547.     service_name = title ? title->value : DEFAULT_SERVICE_NAME;
  548.     provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
  549.     provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
  550.     service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
  551.     service->pmt.write_packet = section_write_packet;
  552.     service->pmt.opaque = s;
  553.     service->pmt.cc = 15;
  554.  
  555.     ts->pat.pid = PAT_PID;
  556.     ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
  557.     ts->pat.write_packet = section_write_packet;
  558.     ts->pat.opaque = s;
  559.  
  560.     ts->sdt.pid = SDT_PID;
  561.     ts->sdt.cc = 15;
  562.     ts->sdt.write_packet = section_write_packet;
  563.     ts->sdt.opaque = s;
  564.  
  565.     pids = av_malloc(s->nb_streams * sizeof(*pids));
  566.     if (!pids)
  567.         return AVERROR(ENOMEM);
  568.  
  569.     /* assign pids to each stream */
  570.     for(i = 0;i < s->nb_streams; i++) {
  571.         st = s->streams[i];
  572.         avpriv_set_pts_info(st, 33, 1, 90000);
  573.         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
  574.         if (!ts_st) {
  575.             ret = AVERROR(ENOMEM);
  576.             goto fail;
  577.         }
  578.         st->priv_data = ts_st;
  579.         ts_st->payload = av_mallocz(ts->pes_payload_size);
  580.         if (!ts_st->payload) {
  581.             ret = AVERROR(ENOMEM);
  582.             goto fail;
  583.         }
  584.         ts_st->service = service;
  585.         /* MPEG pid values < 16 are reserved. Applications which set st->id in
  586.          * this range are assigned a calculated pid. */
  587.         if (st->id < 16) {
  588.             ts_st->pid = ts->start_pid + i;
  589.         } else if (st->id < 0x1FFF) {
  590.             ts_st->pid = st->id;
  591.         } else {
  592.             av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
  593.             ret = AVERROR(EINVAL);
  594.             goto fail;
  595.         }
  596.         if (ts_st->pid == service->pmt.pid) {
  597.             av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
  598.             ret = AVERROR(EINVAL);
  599.             goto fail;
  600.         }
  601.         for (j = 0; j < i; j++)
  602.             if (pids[j] == ts_st->pid) {
  603.                 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
  604.                 ret = AVERROR(EINVAL);
  605.                 goto fail;
  606.             }
  607.         pids[i] = ts_st->pid;
  608.         ts_st->payload_pts = AV_NOPTS_VALUE;
  609.         ts_st->payload_dts = AV_NOPTS_VALUE;
  610.         ts_st->first_pts_check = 1;
  611.         ts_st->cc = 15;
  612.         /* update PCR pid by using the first video stream */
  613.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
  614.             service->pcr_pid == 0x1fff) {
  615.             service->pcr_pid = ts_st->pid;
  616.             pcr_st = st;
  617.         }
  618.         if (st->codec->codec_id == AV_CODEC_ID_AAC &&
  619.             st->codec->extradata_size > 0)
  620.         {
  621.             AVStream *ast;
  622.             ts_st->amux = avformat_alloc_context();
  623.             if (!ts_st->amux) {
  624.                 ret = AVERROR(ENOMEM);
  625.                 goto fail;
  626.             }
  627.             ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
  628.             if (!ts_st->amux->oformat) {
  629.                 ret = AVERROR(EINVAL);
  630.                 goto fail;
  631.             }
  632.             ast = avformat_new_stream(ts_st->amux, NULL);
  633.             ret = avcodec_copy_context(ast->codec, st->codec);
  634.             if (ret != 0)
  635.                 goto fail;
  636.             ret = avformat_write_header(ts_st->amux, NULL);
  637.             if (ret < 0)
  638.                 goto fail;
  639.         }
  640.     }
  641.  
  642.     av_free(pids);
  643.  
  644.     /* if no video stream, use the first stream as PCR */
  645.     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
  646.         pcr_st = s->streams[0];
  647.         ts_st = pcr_st->priv_data;
  648.         service->pcr_pid = ts_st->pid;
  649.     }
  650.  
  651.     if (ts->mux_rate > 1) {
  652.         service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
  653.             (TS_PACKET_SIZE * 8 * 1000);
  654.         ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
  655.             (TS_PACKET_SIZE * 8 * 1000);
  656.         ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
  657.             (TS_PACKET_SIZE * 8 * 1000);
  658.  
  659.         if(ts->copyts < 1)
  660.             ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
  661.     } else {
  662.         /* Arbitrary values, PAT/PMT will also be written on video key frames */
  663.         ts->sdt_packet_period = 200;
  664.         ts->pat_packet_period = 40;
  665.         if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
  666.             if (!pcr_st->codec->frame_size) {
  667.                 av_log(s, AV_LOG_WARNING, "frame size not set\n");
  668.                 service->pcr_packet_period =
  669.                     pcr_st->codec->sample_rate/(10*512);
  670.             } else {
  671.                 service->pcr_packet_period =
  672.                     pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
  673.             }
  674.         } else {
  675.             // max delta PCR 0.1s
  676.             service->pcr_packet_period =
  677.                 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
  678.         }
  679.         if(!service->pcr_packet_period)
  680.             service->pcr_packet_period = 1;
  681.     }
  682.  
  683.     // output a PCR as soon as possible
  684.     service->pcr_packet_count = service->pcr_packet_period;
  685.     ts->pat_packet_count = ts->pat_packet_period-1;
  686.     ts->sdt_packet_count = ts->sdt_packet_period-1;
  687.  
  688.     if (ts->mux_rate == 1)
  689.         av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
  690.     else
  691.         av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
  692.     av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
  693.            "sdt every %d, pat/pmt every %d pkts\n",
  694.            service->pcr_packet_period,
  695.            ts->sdt_packet_period, ts->pat_packet_period);
  696.  
  697.     if (ts->m2ts_mode == -1) {
  698.         if (av_match_ext(s->filename, "m2ts")) {
  699.             ts->m2ts_mode = 1;
  700.         } else {
  701.             ts->m2ts_mode = 0;
  702.         }
  703.     }
  704.  
  705.     avio_flush(s->pb);
  706.  
  707.     return 0;
  708.  
  709.  fail:
  710.     av_free(pids);
  711.     for(i = 0;i < s->nb_streams; i++) {
  712.         MpegTSWriteStream *ts_st;
  713.         st = s->streams[i];
  714.         ts_st = st->priv_data;
  715.         if (ts_st) {
  716.             av_freep(&ts_st->payload);
  717.             if (ts_st->amux) {
  718.                 avformat_free_context(ts_st->amux);
  719.                 ts_st->amux = NULL;
  720.             }
  721.         }
  722.         av_freep(&st->priv_data);
  723.     }
  724.     return ret;
  725. }
  726.  
  727. /* send SDT, PAT and PMT tables regulary */
  728. static void retransmit_si_info(AVFormatContext *s, int force_pat)
  729. {
  730.     MpegTSWrite *ts = s->priv_data;
  731.     int i;
  732.  
  733.     if (++ts->sdt_packet_count == ts->sdt_packet_period) {
  734.         ts->sdt_packet_count = 0;
  735.         mpegts_write_sdt(s);
  736.     }
  737.     if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {
  738.         ts->pat_packet_count = 0;
  739.         mpegts_write_pat(s);
  740.         for(i = 0; i < ts->nb_services; i++) {
  741.             mpegts_write_pmt(s, ts->services[i]);
  742.         }
  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.     av_assert0(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.     av_assert0(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 payload, and segment into an integer number of
  850.  * ts packets. The final ts packet is padded using an over-sized adaptation header
  851.  * to exactly fill the last ts packet.
  852.  * NOTE: 'payload' contains a complete PES payload.
  853.  */
  854. static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
  855.                              const uint8_t *payload, int payload_size,
  856.                              int64_t pts, int64_t dts, int key)
  857. {
  858.     MpegTSWriteStream *ts_st = st->priv_data;
  859.     MpegTSWrite *ts = s->priv_data;
  860.     uint8_t buf[TS_PACKET_SIZE];
  861.     uint8_t *q;
  862.     int val, is_start, len, header_len, write_pcr, private_code, flags;
  863.     int afc_len, stuffing_len;
  864.     int64_t pcr = -1; /* avoid warning */
  865.     int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
  866.     int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
  867.  
  868.     is_start = 1;
  869.     while (payload_size > 0) {
  870.         retransmit_si_info(s, force_pat);
  871.         force_pat = 0;
  872.  
  873.         write_pcr = 0;
  874.         if (ts_st->pid == ts_st->service->pcr_pid) {
  875.             if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
  876.                 ts_st->service->pcr_packet_count++;
  877.             if (ts_st->service->pcr_packet_count >=
  878.                 ts_st->service->pcr_packet_period) {
  879.                 ts_st->service->pcr_packet_count = 0;
  880.                 write_pcr = 1;
  881.             }
  882.         }
  883.  
  884.         if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
  885.             (dts - get_pcr(ts, s->pb)/300) > delay) {
  886.             /* pcr insert gets priority over null packet insert */
  887.             if (write_pcr)
  888.                 mpegts_insert_pcr_only(s, st);
  889.             else
  890.                 mpegts_insert_null_packet(s);
  891.             continue; /* recalculate write_pcr and possibly retransmit si_info */
  892.         }
  893.  
  894.         /* prepare packet header */
  895.         q = buf;
  896.         *q++ = 0x47;
  897.         val = (ts_st->pid >> 8);
  898.         if (is_start)
  899.             val |= 0x40;
  900.         *q++ = val;
  901.         *q++ = ts_st->pid;
  902.         ts_st->cc = (ts_st->cc + 1) & 0xf;
  903.         *q++ = 0x10 | ts_st->cc; // payload indicator + CC
  904.         if (key && is_start && pts != AV_NOPTS_VALUE) {
  905.             // set Random Access for key frames
  906.             if (ts_st->pid == ts_st->service->pcr_pid)
  907.                 write_pcr = 1;
  908.             set_af_flag(buf, 0x40);
  909.             q = get_ts_payload_start(buf);
  910.         }
  911.         if (write_pcr) {
  912.             set_af_flag(buf, 0x10);
  913.             q = get_ts_payload_start(buf);
  914.             // add 11, pcr references the last byte of program clock reference base
  915.             if (ts->mux_rate > 1)
  916.                 pcr = get_pcr(ts, s->pb);
  917.             else
  918.                 pcr = (dts - delay)*300;
  919.             if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
  920.                 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
  921.             extend_af(buf, write_pcr_bits(q, pcr));
  922.             q = get_ts_payload_start(buf);
  923.         }
  924.         if (is_start) {
  925.             int pes_extension = 0;
  926.             /* write PES header */
  927.             *q++ = 0x00;
  928.             *q++ = 0x00;
  929.             *q++ = 0x01;
  930.             private_code = 0;
  931.             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
  932.                 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
  933.                     *q++ = 0xfd;
  934.                 } else
  935.                     *q++ = 0xe0;
  936.             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
  937.                        (st->codec->codec_id == AV_CODEC_ID_MP2 ||
  938.                         st->codec->codec_id == AV_CODEC_ID_MP3 ||
  939.                         st->codec->codec_id == AV_CODEC_ID_AAC)) {
  940.                 *q++ = 0xc0;
  941.             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
  942.                         st->codec->codec_id == AV_CODEC_ID_AC3 &&
  943.                         ts->m2ts_mode) {
  944.                 *q++ = 0xfd;
  945.             } else {
  946.                 *q++ = 0xbd;
  947.                 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
  948.                     private_code = 0x20;
  949.                 }
  950.             }
  951.             header_len = 0;
  952.             flags = 0;
  953.             if (pts != AV_NOPTS_VALUE) {
  954.                 header_len += 5;
  955.                 flags |= 0x80;
  956.             }
  957.             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
  958.                 header_len += 5;
  959.                 flags |= 0x40;
  960.             }
  961.             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
  962.                 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
  963.                 /* set PES_extension_flag */
  964.                 pes_extension = 1;
  965.                 flags |= 0x01;
  966.  
  967.                 /*
  968.                 * One byte for PES2 extension flag +
  969.                 * one byte for extension length +
  970.                 * one byte for extension id
  971.                 */
  972.                 header_len += 3;
  973.             }
  974.             /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
  975.              * otherwise it will not play sound on blu-ray
  976.              */
  977.             if (ts->m2ts_mode &&
  978.                 st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
  979.                 st->codec->codec_id == AV_CODEC_ID_AC3) {
  980.                         /* set PES_extension_flag */
  981.                         pes_extension = 1;
  982.                         flags |= 0x01;
  983.                         header_len += 3;
  984.             }
  985.             len = payload_size + header_len + 3;
  986.             if (private_code != 0)
  987.                 len++;
  988.             if (len > 0xffff)
  989.                 len = 0;
  990.             *q++ = len >> 8;
  991.             *q++ = len;
  992.             val = 0x80;
  993.             /* data alignment indicator is required for subtitle and data streams */
  994.             if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codec->codec_type == AVMEDIA_TYPE_DATA)
  995.                 val |= 0x04;
  996.             *q++ = val;
  997.             *q++ = flags;
  998.             *q++ = header_len;
  999.             if (pts != AV_NOPTS_VALUE) {
  1000.                 write_pts(q, flags >> 6, pts);
  1001.                 q += 5;
  1002.             }
  1003.             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
  1004.                 write_pts(q, 1, dts);
  1005.                 q += 5;
  1006.             }
  1007.             if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
  1008.                 flags = 0x01;  /* set PES_extension_flag_2 */
  1009.                 *q++ = flags;
  1010.                 *q++ = 0x80 | 0x01;  /* marker bit + extension length */
  1011.                 /*
  1012.                 * Set the stream id extension flag bit to 0 and
  1013.                 * write the extended stream id
  1014.                 */
  1015.                 *q++ = 0x00 | 0x60;
  1016.             }
  1017.             /* For Blu-ray AC3 Audio Setting extended flags */
  1018.           if (ts->m2ts_mode &&
  1019.               pes_extension &&
  1020.               st->codec->codec_id == AV_CODEC_ID_AC3) {
  1021.                       flags = 0x01; /* set PES_extension_flag_2 */
  1022.                       *q++ = flags;
  1023.                       *q++ = 0x80 | 0x01; /* marker bit + extension length */
  1024.                       *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
  1025.               }
  1026.  
  1027.  
  1028.             if (private_code != 0)
  1029.                 *q++ = private_code;
  1030.             is_start = 0;
  1031.         }
  1032.         /* header size */
  1033.         header_len = q - buf;
  1034.         /* data len */
  1035.         len = TS_PACKET_SIZE - header_len;
  1036.         if (len > payload_size)
  1037.             len = payload_size;
  1038.         stuffing_len = TS_PACKET_SIZE - header_len - len;
  1039.         if (stuffing_len > 0) {
  1040.             /* add stuffing with AFC */
  1041.             if (buf[3] & 0x20) {
  1042.                 /* stuffing already present: increase its size */
  1043.                 afc_len = buf[4] + 1;
  1044.                 memmove(buf + 4 + afc_len + stuffing_len,
  1045.                         buf + 4 + afc_len,
  1046.                         header_len - (4 + afc_len));
  1047.                 buf[4] += stuffing_len;
  1048.                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
  1049.             } else {
  1050.                 /* add stuffing */
  1051.                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
  1052.                 buf[3] |= 0x20;
  1053.                 buf[4] = stuffing_len - 1;
  1054.                 if (stuffing_len >= 2) {
  1055.                     buf[5] = 0x00;
  1056.                     memset(buf + 6, 0xff, stuffing_len - 2);
  1057.                 }
  1058.             }
  1059.         }
  1060.         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
  1061.         payload += len;
  1062.         payload_size -= len;
  1063.         mpegts_prefix_m2ts_header(s);
  1064.         avio_write(s->pb, buf, TS_PACKET_SIZE);
  1065.     }
  1066.     avio_flush(s->pb);
  1067.     ts_st->prev_payload_key = key;
  1068. }
  1069.  
  1070. static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
  1071. {
  1072.     AVStream *st = s->streams[pkt->stream_index];
  1073.     int size = pkt->size;
  1074.     uint8_t *buf= pkt->data;
  1075.     uint8_t *data= NULL;
  1076.     MpegTSWrite *ts = s->priv_data;
  1077.     MpegTSWriteStream *ts_st = st->priv_data;
  1078.     const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
  1079.     int64_t dts = pkt->dts, pts = pkt->pts;
  1080.  
  1081.     if (ts->reemit_pat_pmt) {
  1082.         av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
  1083.         ts->reemit_pat_pmt = 0;
  1084.         ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
  1085.     }
  1086.  
  1087.     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
  1088.         ts->pat_packet_count = ts->pat_packet_period - 1;
  1089.         ts->sdt_packet_count = ts->sdt_packet_period - 1;
  1090.         ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
  1091.     }
  1092.  
  1093.     if(ts->copyts < 1){
  1094.         if (pts != AV_NOPTS_VALUE)
  1095.             pts += delay;
  1096.         if (dts != AV_NOPTS_VALUE)
  1097.             dts += delay;
  1098.     }
  1099.  
  1100.     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
  1101.         av_log(s, AV_LOG_ERROR, "first pts value must be set\n");
  1102.         return AVERROR_INVALIDDATA;
  1103.     }
  1104.     ts_st->first_pts_check = 0;
  1105.  
  1106.     if (st->codec->codec_id == AV_CODEC_ID_H264) {
  1107.         const uint8_t *p = buf, *buf_end = p+size;
  1108.         uint32_t state = -1;
  1109.  
  1110.         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
  1111.             if (!st->nb_frames) {
  1112.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
  1113.                    "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
  1114.             return AVERROR(EINVAL);
  1115.             }
  1116.             av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing\n");
  1117.         }
  1118.  
  1119.         do {
  1120.             p = avpriv_find_start_code(p, buf_end, &state);
  1121.             av_dlog(s, "nal %d\n", state & 0x1f);
  1122.         } while (p < buf_end && (state & 0x1f) != 9 &&
  1123.                  (state & 0x1f) != 5 && (state & 0x1f) != 1);
  1124.  
  1125.         if ((state & 0x1f) != 9) { // AUD NAL
  1126.             data = av_malloc(pkt->size+6);
  1127.             if (!data)
  1128.                 return AVERROR(ENOMEM);
  1129.             memcpy(data+6, pkt->data, pkt->size);
  1130.             AV_WB32(data, 0x00000001);
  1131.             data[4] = 0x09;
  1132.             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
  1133.             buf  = data;
  1134.             size = pkt->size+6;
  1135.         }
  1136.     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
  1137.         if (pkt->size < 2) {
  1138.             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
  1139.             return AVERROR_INVALIDDATA;
  1140.         }
  1141.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
  1142.             int ret;
  1143.             AVPacket pkt2;
  1144.  
  1145.             if (!ts_st->amux) {
  1146.                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
  1147.                        "and extradata missing\n");
  1148.                 return AVERROR_INVALIDDATA;
  1149.             }
  1150.  
  1151.             av_init_packet(&pkt2);
  1152.             pkt2.data = pkt->data;
  1153.             pkt2.size = pkt->size;
  1154.             ret = avio_open_dyn_buf(&ts_st->amux->pb);
  1155.             if (ret < 0)
  1156.                 return AVERROR(ENOMEM);
  1157.  
  1158.             ret = av_write_frame(ts_st->amux, &pkt2);
  1159.             if (ret < 0) {
  1160.                 avio_close_dyn_buf(ts_st->amux->pb, &data);
  1161.                 ts_st->amux->pb = NULL;
  1162.                 av_free(data);
  1163.                 return ret;
  1164.             }
  1165.             size = avio_close_dyn_buf(ts_st->amux->pb, &data);
  1166.             ts_st->amux->pb = NULL;
  1167.             buf = data;
  1168.         }
  1169.     }
  1170.  
  1171.     if (pkt->dts != AV_NOPTS_VALUE) {
  1172.         int i;
  1173.         for(i=0; i<s->nb_streams; i++){
  1174.             AVStream *st2 = s->streams[i];
  1175.             MpegTSWriteStream *ts_st2 = st2->priv_data;
  1176.             if(   ts_st2->payload_size
  1177.                && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){
  1178.                 mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,
  1179.                                 ts_st2->payload_pts, ts_st2->payload_dts,
  1180.                                 ts_st2->payload_flags & AV_PKT_FLAG_KEY);
  1181.                 ts_st2->payload_size = 0;
  1182.             }
  1183.         }
  1184.     }
  1185.  
  1186.     if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {
  1187.         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
  1188.                          ts_st->payload_pts, ts_st->payload_dts,
  1189.                          ts_st->payload_flags & AV_PKT_FLAG_KEY);
  1190.         ts_st->payload_size = 0;
  1191.     }
  1192.  
  1193.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
  1194.         av_assert0(!ts_st->payload_size);
  1195.         // for video and subtitle, write a single pes packet
  1196.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
  1197.         av_free(data);
  1198.         return 0;
  1199.     }
  1200.  
  1201.     if (!ts_st->payload_size) {
  1202.         ts_st->payload_pts = pts;
  1203.         ts_st->payload_dts = dts;
  1204.         ts_st->payload_flags = pkt->flags;
  1205.     }
  1206.  
  1207.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);
  1208.     ts_st->payload_size += size;
  1209.  
  1210.     av_free(data);
  1211.  
  1212.     return 0;
  1213. }
  1214.  
  1215. static void mpegts_write_flush(AVFormatContext *s)
  1216. {
  1217.     int i;
  1218.  
  1219.     /* flush current packets */
  1220.     for(i = 0; i < s->nb_streams; i++) {
  1221.         AVStream *st = s->streams[i];
  1222.         MpegTSWriteStream *ts_st = st->priv_data;
  1223.         if (ts_st->payload_size > 0) {
  1224.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
  1225.                              ts_st->payload_pts, ts_st->payload_dts,
  1226.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);
  1227.             ts_st->payload_size = 0;
  1228.         }
  1229.     }
  1230.     avio_flush(s->pb);
  1231. }
  1232.  
  1233. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
  1234. {
  1235.     if (!pkt) {
  1236.         mpegts_write_flush(s);
  1237.         return 1;
  1238.     } else {
  1239.         return mpegts_write_packet_internal(s, pkt);
  1240.     }
  1241. }
  1242.  
  1243. static int mpegts_write_end(AVFormatContext *s)
  1244. {
  1245.     MpegTSWrite *ts = s->priv_data;
  1246.     MpegTSService *service;
  1247.     int i;
  1248.  
  1249.     mpegts_write_flush(s);
  1250.  
  1251.     for(i = 0; i < s->nb_streams; i++) {
  1252.         AVStream *st = s->streams[i];
  1253.         MpegTSWriteStream *ts_st = st->priv_data;
  1254.         av_freep(&ts_st->payload);
  1255.         if (ts_st->amux) {
  1256.             avformat_free_context(ts_st->amux);
  1257.             ts_st->amux = NULL;
  1258.         }
  1259.     }
  1260.  
  1261.     for(i = 0; i < ts->nb_services; i++) {
  1262.         service = ts->services[i];
  1263.         av_freep(&service->provider_name);
  1264.         av_freep(&service->name);
  1265.         av_free(service);
  1266.     }
  1267.     av_free(ts->services);
  1268.  
  1269.     return 0;
  1270. }
  1271.  
  1272. AVOutputFormat ff_mpegts_muxer = {
  1273.     .name              = "mpegts",
  1274.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
  1275.     .mime_type         = "video/x-mpegts",
  1276.     .extensions        = "ts,m2t,m2ts,mts",
  1277.     .priv_data_size    = sizeof(MpegTSWrite),
  1278.     .audio_codec       = AV_CODEC_ID_MP2,
  1279.     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,
  1280.     .write_header      = mpegts_write_header,
  1281.     .write_packet      = mpegts_write_packet,
  1282.     .write_trailer     = mpegts_write_end,
  1283.     .flags             = AVFMT_ALLOW_FLUSH,
  1284.     .priv_class        = &mpegts_muxer_class,
  1285. };
  1286.