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FFmpeg/libavformat/mpegtsenc.c

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  1. /*

  2.  * MPEG2 transport stream (aka DVB) muxer

  3.  * Copyright (c) 2003 Fabrice Bellard

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/bswap.h"

  23. #include "libavutil/crc.h"

  24. #include "libavutil/dict.h"

  25. #include "libavutil/mathematics.h"

  26. #include "libavutil/opt.h"

  27. #include "libavcodec/mpegvideo.h"

  28. #include "avformat.h"

  29. #include "internal.h"

  30. #include "mpegts.h"

  31. #include "adts.h"

  32. 

  33. #define PCR_TIME_BASE 27000000

  34. 

  35. /* write DVB SI sections */

  36. 

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

  38. /* mpegts section writer */

  39. 

  40. typedef struct MpegTSSection {

  41.     int pid;

  42.     int cc;

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

  44.     void *opaque;

  45. } MpegTSSection;

  46. 

  47. typedef struct MpegTSService {

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

  49.     int sid;           /* service ID */

  50.     char *name;

  51.     char *provider_name;

  52.     int pcr_pid;

  53.     int pcr_packet_count;

  54.     int pcr_packet_period;

  55. } MpegTSService;

  56. 

  57. typedef struct MpegTSWrite {

  58.     const AVClass *av_class;

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

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

  61.     MpegTSService **services;

  62.     int sdt_packet_count;

  63.     int sdt_packet_period;

  64.     int pat_packet_count;

  65.     int pat_packet_period;

  66.     int nb_services;

  67.     int onid;

  68.     int tsid;

  69.     int64_t first_pcr;

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

  71. 

  72.     int transport_stream_id;

  73.     int original_network_id;

  74.     int service_id;

  75. 

  76.     int pmt_start_pid;

  77.     int start_pid;

  78. } MpegTSWrite;

  79. 

  80. static const AVOption options[] = {

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

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

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

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

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

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

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

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

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

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

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

  92.     { NULL },

  93. };

  94. 

  95. static const AVClass mpegts_muxer_class = {

  96.     .class_name     = "MPEGTS muxer",

  97.     .item_name      = av_default_item_name,

  98.     .option         = options,

  99.     .version        = LIBAVUTIL_VERSION_INT,

  100. };

  101. 

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

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

  104. {

  105.     unsigned int crc;

  106.     unsigned char packet[TS_PACKET_SIZE];

  107.     const unsigned char *buf_ptr;

  108.     unsigned char *q;

  109.     int first, b, len1, left;

  110. 

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

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

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

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

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

  116. 

  117.     /* send each packet */

  118.     buf_ptr = buf;

  119.     while (len > 0) {

  120.         first = (buf == buf_ptr);

  121.         q = packet;

  122.         *q++ = 0x47;

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

  124.         if (first)

  125.             b |= 0x40;

  126.         *q++ = b;

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

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

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

  130.         if (first)

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

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

  133.         if (len1 > len)

  134.             len1 = len;

  135.         memcpy(q, buf_ptr, len1);

  136.         q += len1;

  137.         /* add known padding data */

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

  139.         if (left > 0)

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

  141. 

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

  143. 

  144.         buf_ptr += len1;

  145.         len -= len1;

  146.     }

  147. }

  148. 

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

  150. {

  151.     uint8_t *q;

  152.     q = *q_ptr;

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

  154.     *q++ = val;

  155.     *q_ptr = q;

  156. }

  157. 

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

  159.                           int version, int sec_num, int last_sec_num,

  160.                           uint8_t *buf, int len)

  161. {

  162.     uint8_t section[1024], *q;

  163.     unsigned int tot_len;

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

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

  166. 

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

  168.     /* check if not too big */

  169.     if (tot_len > 1024)

  170.         return -1;

  171. 

  172.     q = section;

  173.     *q++ = tid;

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

  175.     put16(&q, id);

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

  177.     *q++ = sec_num;

  178.     *q++ = last_sec_num;

  179.     memcpy(q, buf, len);

  180. 

  181.     mpegts_write_section(s, section, tot_len);

  182.     return 0;

  183. }

  184. 

  185. /*********************************************/

  186. /* mpegts writer */

  187. 

  188. #define DEFAULT_PROVIDER_NAME   "Libav"

  189. #define DEFAULT_SERVICE_NAME    "Service01"

  190. 

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

  192. #define DEFAULT_PES_HEADER_FREQ 16

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

  194. 

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

  196. #define SDT_RETRANS_TIME 500

  197. #define PAT_RETRANS_TIME 100

  198. #define PCR_RETRANS_TIME 20

  199. 

  200. typedef struct MpegTSWriteStream {

  201.     struct MpegTSService *service;

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

  203.     int cc;

  204.     int payload_index;

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

  206.     int64_t payload_pts;

  207.     int64_t payload_dts;

  208.     int payload_flags;

  209.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  210.     ADTSContext *adts;

  211. } MpegTSWriteStream;

  212. 

  213. static void mpegts_write_pat(AVFormatContext *s)

  214. {

  215.     MpegTSWrite *ts = s->priv_data;

  216.     MpegTSService *service;

  217.     uint8_t data[1012], *q;

  218.     int i;

  219. 

  220.     q = data;

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

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

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

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

  225.     }

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

  227.                           data, q - data);

  228. }

  229. 

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

  231. {

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

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

  234.     int val, stream_type, i;

  235. 

  236.     q = data;

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

  238. 

  239.     program_info_length_ptr = q;

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

  241. 

  242.     /* put program info here */

  243. 

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

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

  246.     program_info_length_ptr[1] = val;

  247. 

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

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

  250.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  253.         case CODEC_ID_MPEG1VIDEO:

  254.         case CODEC_ID_MPEG2VIDEO:

  255.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  256.             break;

  257.         case CODEC_ID_MPEG4:

  258.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  259.             break;

  260.         case CODEC_ID_H264:

  261.             stream_type = STREAM_TYPE_VIDEO_H264;

  262.             break;

  263.         case CODEC_ID_DIRAC:

  264.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  265.             break;

  266.         case CODEC_ID_MP2:

  267.         case CODEC_ID_MP3:

  268.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  269.             break;

  270.         case CODEC_ID_AAC:

  271.             stream_type = STREAM_TYPE_AUDIO_AAC;

  272.             break;

  273.         case CODEC_ID_AAC_LATM:

  274.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  275.             break;

  276.         case CODEC_ID_AC3:

  277.             stream_type = STREAM_TYPE_AUDIO_AC3;

  278.             break;

  279.         default:

  280.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  281.             break;

  282.         }

  283.         *q++ = stream_type;

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

  285.         desc_length_ptr = q;

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

  287. 

  288.         /* write optional descriptors here */

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

  290.         case AVMEDIA_TYPE_AUDIO:

  291.             if (lang) {

  292.                 char *p;

  293.                 char *next = lang->value;

  294.                 uint8_t *len_ptr;

  295. 

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

  297.                 len_ptr = q++;

  298.                 *len_ptr = 0;

  299. 

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

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

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

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

  304. 

  305.                     *q++ = *p++;

  306.                     *q++ = *p++;

  307.                     *q++ = *p++;

  308. 

  309.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  310.                     *q++ = 0x01;

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

  312.                     *q++ = 0x02;

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

  314.                     *q++ = 0x03;

  315.                 else

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

  317. 

  318.                     *len_ptr += 4;

  319.                 }

  320. 

  321.                 if (*len_ptr == 0)

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

  323.             }

  324.             break;

  325.         case AVMEDIA_TYPE_SUBTITLE:

  326.             {

  327.                 const char *language;

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

  329.                 *q++ = 0x59;

  330.                 *q++ = 8;

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

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

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

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

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

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

  337.                     q += 4;

  338.                 } else {

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

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

  341.                 }

  342.             }

  343.             break;

  344.         case AVMEDIA_TYPE_VIDEO:

  345.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  347.                 *q++ = 4;

  348.                 *q++ = 'd';

  349.                 *q++ = 'r';

  350.                 *q++ = 'a';

  351.                 *q++ = 'c';

  352.             }

  353.             break;

  354.         }

  355. 

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

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

  358.         desc_length_ptr[1] = val;

  359.     }

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

  361.                           data, q - data);

  362. }

  363. 

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

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

  366. {

  367.     uint8_t *q;

  368.     int len;

  369. 

  370.     q = *q_ptr;

  371.     if (!str)

  372.         len = 0;

  373.     else

  374.         len = strlen(str);

  375.     *q++ = len;

  376.     memcpy(q, str, len);

  377.     q += len;

  378.     *q_ptr = q;

  379. }

  380. 

  381. static void mpegts_write_sdt(AVFormatContext *s)

  382. {

  383.     MpegTSWrite *ts = s->priv_data;

  384.     MpegTSService *service;

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

  386.     int i, running_status, free_ca_mode, val;

  387. 

  388.     q = data;

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

  390.     *q++ = 0xff;

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

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

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

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

  395.         desc_list_len_ptr = q;

  396.         q += 2;

  397.         running_status = 4; /* running */

  398.         free_ca_mode = 0;

  399. 

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

  401.         *q++ = 0x48;

  402.         desc_len_ptr = q;

  403.         q++;

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

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

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

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

  408. 

  409.         /* fill descriptor length */

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

  411.             (q - desc_list_len_ptr - 2);

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

  413.         desc_list_len_ptr[1] = val;

  414.     }

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

  416.                           data, q - data);

  417. }

  418. 

  419. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  420.                                          int sid,

  421.                                          const char *provider_name,

  422.                                          const char *name)

  423. {

  424.     MpegTSService *service;

  425. 

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

  427.     if (!service)

  428.         return NULL;

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

  430.     service->sid = sid;

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

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

  433.     service->pcr_pid = 0x1fff;

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

  435.     return service;

  436. }

  437. 

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

  439. {

  440.     AVFormatContext *ctx = s->opaque;

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

  442. }

  443. 

  444. static int mpegts_write_header(AVFormatContext *s)

  445. {

  446.     MpegTSWrite *ts = s->priv_data;

  447.     MpegTSWriteStream *ts_st;

  448.     MpegTSService *service;

  449.     AVStream *st, *pcr_st = NULL;

  450.     AVDictionaryEntry *title, *provider;

  451.     int i, j;

  452.     const char *service_name;

  453.     const char *provider_name;

  454.     int *pids;

  455. 

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

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

  458.     /* allocate a single DVB service */

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

  460.     if (!title)

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

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

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

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

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

  466.     service->pmt.write_packet = section_write_packet;

  467.     service->pmt.opaque = s;

  468.     service->pmt.cc = 15;

  469. 

  470.     ts->pat.pid = PAT_PID;

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

  472.     ts->pat.write_packet = section_write_packet;

  473.     ts->pat.opaque = s;

  474. 

  475.     ts->sdt.pid = SDT_PID;

  476.     ts->sdt.cc = 15;

  477.     ts->sdt.write_packet = section_write_packet;

  478.     ts->sdt.opaque = s;

  479. 

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

  481.     if (!pids)

  482.         return AVERROR(ENOMEM);

  483. 

  484.     /* assign pids to each stream */

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

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

  487.         av_set_pts_info(st, 33, 1, 90000);

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

  489.         if (!ts_st)

  490.             goto fail;

  491.         st->priv_data = ts_st;

  492.         ts_st->service = service;

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

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

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

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

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

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

  499.         } else {

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

  501.             goto fail;

  502.         }

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

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

  505.             goto fail;

  506.         }

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

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

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

  510.                 goto fail;

  511.             }

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

  513.         ts_st->payload_pts = AV_NOPTS_VALUE;

  514.         ts_st->payload_dts = AV_NOPTS_VALUE;

  515.         ts_st->first_pts_check = 1;

  516.         ts_st->cc = 15;

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

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

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

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

  521.             pcr_st = st;

  522.         }

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

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

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

  526.             if (!ts_st->adts)

  527.                 return AVERROR(ENOMEM);

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

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

  530.                 return -1;

  531.         }

  532.     }

  533. 

  534.     av_free(pids);

  535. 

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

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

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

  539.         ts_st = pcr_st->priv_data;

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

  541.     }

  542. 

  543. #if FF_API_MUXRATE

  544.     if (s->mux_rate)

  545.         ts->mux_rate = s->mux_rate;

  546. #endif

  547. 

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

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

  550.             (TS_PACKET_SIZE * 8 * 1000);

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

  552.             (TS_PACKET_SIZE * 8 * 1000);

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

  554.             (TS_PACKET_SIZE * 8 * 1000);

  555. 

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

  557.     } else {

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

  559.         ts->sdt_packet_period = 200;

  560.         ts->pat_packet_period = 40;

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

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

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

  564.                 service->pcr_packet_period =

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

  566.             } else {

  567.                 service->pcr_packet_period =

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

  569.             }

  570.         } else {

  571.             // max delta PCR 0.1s

  572.             service->pcr_packet_period =

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

  574.         }

  575.     }

  576. 

  577.     // output a PCR as soon as possible

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

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

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

  581. 

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

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

  584.     else

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

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

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

  588.            service->pcr_packet_period,

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

  590. 

  591.     avio_flush(s->pb);

  592. 

  593.     return 0;

  594. 

  595.  fail:

  596.     av_free(pids);

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

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

  599.         av_freep(&st->priv_data);

  600.     }

  601.     return -1;

  602. }

  603. 

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

  605. static void retransmit_si_info(AVFormatContext *s)

  606. {

  607.     MpegTSWrite *ts = s->priv_data;

  608.     int i;

  609. 

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

  611.         ts->sdt_packet_count = 0;

  612.         mpegts_write_sdt(s);

  613.     }

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

  615.         ts->pat_packet_count = 0;

  616.         mpegts_write_pat(s);

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

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

  619.         }

  620.     }

  621. }

  622. 

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

  624. {

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

  626.            ts->first_pcr;

  627. }

  628. 

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

  630. {

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

  632. 

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

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

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

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

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

  638.     *buf++ = pcr_low;

  639. 

  640.     return 6;

  641. }

  642. 

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

  644. static void mpegts_insert_null_packet(AVFormatContext *s)

  645. {

  646.     uint8_t *q;

  647.     uint8_t buf[TS_PACKET_SIZE];

  648. 

  649.     q = buf;

  650.     *q++ = 0x47;

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

  652.     *q++ = 0xff;

  653.     *q++ = 0x10;

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

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

  656. }

  657. 

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

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

  660. {

  661.     MpegTSWrite *ts = s->priv_data;

  662.     MpegTSWriteStream *ts_st = st->priv_data;

  663.     uint8_t *q;

  664.     uint8_t buf[TS_PACKET_SIZE];

  665. 

  666.     q = buf;

  667.     *q++ = 0x47;

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

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

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

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

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

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

  674. 

  675.     /* PCR coded into 6 bytes */

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

  677. 

  678.     /* stuffing bytes */

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

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

  681. }

  682. 

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

  684. {

  685.     int val;

  686. 

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

  688.     *q++ = val;

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

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

  691.     *q++ = val;

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

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

  694.     *q++ = val;

  695. }

  696. 

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

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

  699. {

  700.     // expect at least one flag to set

  701.     assert(flag);

  702. 

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

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

  705.         pkt[3] |= 0x20;

  706.         // 1 byte length, no flags

  707.         pkt[4] = 1;

  708.         pkt[5] = 0;

  709.     }

  710.     pkt[5] |= flag;

  711. }

  712. 

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

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

  715. {

  716.     // expect already existing adaptation field

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

  718.     pkt[4] += size;

  719. }

  720. 

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

  722. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  723. {

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

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

  726.     else

  727.         return pkt + 4;

  728. }

  729. 

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

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

  732.  * to exactly fill the last ts packet.

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

  734.  */

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

  736.                              const uint8_t *payload, int payload_size,

  737.                              int64_t pts, int64_t dts, int key)

  738. {

  739.     MpegTSWriteStream *ts_st = st->priv_data;

  740.     MpegTSWrite *ts = s->priv_data;

  741.     uint8_t buf[TS_PACKET_SIZE];

  742.     uint8_t *q;

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

  744.     int afc_len, stuffing_len;

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

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

  747. 

  748.     is_start = 1;

  749.     while (payload_size > 0) {

  750.         retransmit_si_info(s);

  751. 

  752.         write_pcr = 0;

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

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

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

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

  757.                 ts_st->service->pcr_packet_period) {

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

  759.                 write_pcr = 1;

  760.             }

  761.         }

  762. 

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

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

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

  766.             if (write_pcr)

  767.                 mpegts_insert_pcr_only(s, st);

  768.             else

  769.                 mpegts_insert_null_packet(s);

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

  771.         }

  772. 

  773.         /* prepare packet header */

  774.         q = buf;

  775.         *q++ = 0x47;

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

  777.         if (is_start)

  778.             val |= 0x40;

  779.         *q++ = val;

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

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

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

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

  784.             // set Random Access for key frames

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

  786.                 write_pcr = 1;

  787.             set_af_flag(buf, 0x40);

  788.             q = get_ts_payload_start(buf);

  789.         }

  790.         if (write_pcr) {

  791.             set_af_flag(buf, 0x10);

  792.             q = get_ts_payload_start(buf);

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

  794.             if (ts->mux_rate > 1)

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

  796.             else

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

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

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

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

  801.             q = get_ts_payload_start(buf);

  802.         }

  803.         if (is_start) {

  804.             int pes_extension = 0;

  805.             /* write PES header */

  806.             *q++ = 0x00;

  807.             *q++ = 0x00;

  808.             *q++ = 0x01;

  809.             private_code = 0;

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

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

  812.                     *q++ = 0xfd;

  813.                 } else

  814.                     *q++ = 0xe0;

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

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

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

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

  819.                 *q++ = 0xc0;

  820.             } else {

  821.                 *q++ = 0xbd;

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

  823.                     private_code = 0x20;

  824.                 }

  825.             }

  826.             header_len = 0;

  827.             flags = 0;

  828.             if (pts != AV_NOPTS_VALUE) {

  829.                 header_len += 5;

  830.                 flags |= 0x80;

  831.             }

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

  833.                 header_len += 5;

  834.                 flags |= 0x40;

  835.             }

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

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

  838.                 /* set PES_extension_flag */

  839.                 pes_extension = 1;

  840.                 flags |= 0x01;

  841. 

  842.                 /*

  843.                 * One byte for PES2 extension flag +

  844.                 * one byte for extension length +

  845.                 * one byte for extension id

  846.                 */

  847.                 header_len += 3;

  848.             }

  849.             len = payload_size + header_len + 3;

  850.             if (private_code != 0)

  851.                 len++;

  852.             if (len > 0xffff)

  853.                 len = 0;

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

  855.             *q++ = len;

  856.             val = 0x80;

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

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

  859.                 val |= 0x04;

  860.             *q++ = val;

  861.             *q++ = flags;

  862.             *q++ = header_len;

  863.             if (pts != AV_NOPTS_VALUE) {

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

  865.                 q += 5;

  866.             }

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

  868.                 write_pts(q, 1, dts);

  869.                 q += 5;

  870.             }

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

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

  873.                 *q++ = flags;

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

  875.                 /*

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

  877.                 * write the extended stream id

  878.                 */

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

  880.             }

  881.             if (private_code != 0)

  882.                 *q++ = private_code;

  883.             is_start = 0;

  884.         }

  885.         /* header size */

  886.         header_len = q - buf;

  887.         /* data len */

  888.         len = TS_PACKET_SIZE - header_len;

  889.         if (len > payload_size)

  890.             len = payload_size;

  891.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  892.         if (stuffing_len > 0) {

  893.             /* add stuffing with AFC */

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

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

  896.                 afc_len = buf[4] + 1;

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

  898.                         buf + 4 + afc_len,

  899.                         header_len - (4 + afc_len));

  900.                 buf[4] += stuffing_len;

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

  902.             } else {

  903.                 /* add stuffing */

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

  905.                 buf[3] |= 0x20;

  906.                 buf[4] = stuffing_len - 1;

  907.                 if (stuffing_len >= 2) {

  908.                     buf[5] = 0x00;

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

  910.                 }

  911.             }

  912.         }

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

  914.         payload += len;

  915.         payload_size -= len;

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

  917.     }

  918.     avio_flush(s->pb);

  919. }

  920. 

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

  922. {

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

  924.     int size = pkt->size;

  925.     uint8_t *buf= pkt->data;

  926.     uint8_t *data= NULL;

  927.     MpegTSWriteStream *ts_st = st->priv_data;

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

  929.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  930. 

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

  932.         pts = pkt->pts + delay;

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

  934.         dts = pkt->dts + delay;

  935. 

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

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

  938.         return -1;

  939.     }

  940.     ts_st->first_pts_check = 0;

  941. 

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

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

  944.         uint32_t state = -1;

  945. 

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

  947.             av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "

  948.                    "no startcode found, use -vbsf h264_mp4toannexb\n");

  949.             return -1;

  950.         }

  951. 

  952.         do {

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

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

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

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

  957. 

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

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

  960.             if (!data)

  961.                 return -1;

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

  963.             AV_WB32(data, 0x00000001);

  964.             data[4] = 0x09;

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

  966.             buf  = data;

  967.             size = pkt->size+6;

  968.         }

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

  970.         if (pkt->size < 2)

  971.             return -1;

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

  973.             ADTSContext *adts = ts_st->adts;

  974.             int new_size;

  975.             if (!adts) {

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

  977.                        "and extradata missing\n");

  978.                 return -1;

  979.             }

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

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

  982.                 return -1;

  983.             data = av_malloc(new_size);

  984.             if (!data)

  985.                 return AVERROR(ENOMEM);

  986.             ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);

  987.             if (adts->pce_size) {

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

  989.                 adts->pce_size = 0;

  990.             }

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

  992.             buf = data;

  993.             size = new_size;

  994.         }

  995.     }

  996. 

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

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

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

  1000.         av_free(data);

  1001.         return 0;

  1002.     }

  1003. 

  1004.     if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {

  1005.         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,

  1006.                          ts_st->payload_pts, ts_st->payload_dts,

  1007.                          ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1008.         ts_st->payload_index = 0;

  1009.     }

  1010. 

  1011.     if (!ts_st->payload_index) {

  1012.         ts_st->payload_pts = pts;

  1013.         ts_st->payload_dts = dts;

  1014.         ts_st->payload_flags = pkt->flags;

  1015.     }

  1016. 

  1017.     memcpy(ts_st->payload + ts_st->payload_index, buf, size);

  1018.     ts_st->payload_index += size;

  1019. 

  1020.     av_free(data);

  1021. 

  1022.     return 0;

  1023. }

  1024. 

  1025. static int mpegts_write_end(AVFormatContext *s)

  1026. {

  1027.     MpegTSWrite *ts = s->priv_data;

  1028.     MpegTSWriteStream *ts_st;

  1029.     MpegTSService *service;

  1030.     AVStream *st;

  1031.     int i;

  1032. 

  1033.     /* flush current packets */

  1034.     for(i = 0; i < s->nb_streams; i++) {

  1035.         st = s->streams[i];

  1036.         ts_st = st->priv_data;

  1037.         if (ts_st->payload_index > 0) {

  1038.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,

  1039.                              ts_st->payload_pts, ts_st->payload_dts,

  1040.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1041.         }

  1042.         av_freep(&ts_st->adts);

  1043.     }

  1044.     avio_flush(s->pb);

  1045. 

  1046.     for(i = 0; i < ts->nb_services; i++) {

  1047.         service = ts->services[i];

  1048.         av_freep(&service->provider_name);

  1049.         av_freep(&service->name);

  1050.         av_free(service);

  1051.     }

  1052.     av_free(ts->services);

  1053. 

  1054.     return 0;

  1055. }

  1056. 

  1057. AVOutputFormat ff_mpegts_muxer = {

  1058.     .name              = "mpegts",

  1059.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1060.     .mime_type         = "video/x-mpegts",

  1061.     .extensions        = "ts,m2t",

  1062.     .priv_data_size    = sizeof(MpegTSWrite),

  1063.     .audio_codec       = CODEC_ID_MP2,

  1064.     .video_codec       = CODEC_ID_MPEG2VIDEO,

  1065.     .write_header      = mpegts_write_header,

  1066.     .write_packet      = mpegts_write_packet,

  1067.     .write_trailer     = mpegts_write_end,

  1068.     .priv_class = &mpegts_muxer_class,

  1069. };