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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/opt.h"

  26. #include "libavcodec/mpegvideo.h"

  27. #include "avformat.h"

  28. #include "internal.h"

  29. #include "mpegts.h"

  30. #include "adts.h"

  31. 

  32. #define PCR_TIME_BASE 27000000

  33. 

  34. /* write DVB SI sections */

  35. 

  36. /*********************************************/

  37. /* mpegts section writer */

  38. 

  39. typedef struct MpegTSSection {

  40.     int pid;

  41.     int cc;

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

  43.     void *opaque;

  44. } MpegTSSection;

  45. 

  46. typedef struct MpegTSService {

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

  48.     int sid;           /* service ID */

  49.     char *name;

  50.     char *provider_name;

  51.     int pcr_pid;

  52.     int pcr_packet_count;

  53.     int pcr_packet_period;

  54. } MpegTSService;

  55. 

  56. typedef struct MpegTSWrite {

  57.     const AVClass *av_class;

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

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

  60.     MpegTSService **services;

  61.     int sdt_packet_count;

  62.     int sdt_packet_period;

  63.     int pat_packet_count;

  64.     int pat_packet_period;

  65.     int nb_services;

  66.     int onid;

  67.     int tsid;

  68.     int64_t first_pcr;

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

  70. 

  71.     int transport_stream_id;

  72.     int original_network_id;

  73.     int service_id;

  74. 

  75.     int pmt_start_pid;

  76.     int start_pid;

  77. } MpegTSWrite;

  78. 

  79. static const AVOption options[] = {

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

  81.       offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  83.       offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  85.       offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  87.       offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

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

  89.       offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},

  90.     { NULL },

  91. };

  92. 

  93. static const AVClass mpegts_muxer_class = {

  94.     .class_name     = "MPEGTS muxer",

  95.     .item_name      = av_default_item_name,

  96.     .option         = options,

  97.     .version        = LIBAVUTIL_VERSION_INT,

  98. };

  99. 

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

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

  102. {

  103.     unsigned int crc;

  104.     unsigned char packet[TS_PACKET_SIZE];

  105.     const unsigned char *buf_ptr;

  106.     unsigned char *q;

  107.     int first, b, len1, left;

  108. 

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

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

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

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

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

  114. 

  115.     /* send each packet */

  116.     buf_ptr = buf;

  117.     while (len > 0) {

  118.         first = (buf == buf_ptr);

  119.         q = packet;

  120.         *q++ = 0x47;

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

  122.         if (first)

  123.             b |= 0x40;

  124.         *q++ = b;

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

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

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

  128.         if (first)

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

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

  131.         if (len1 > len)

  132.             len1 = len;

  133.         memcpy(q, buf_ptr, len1);

  134.         q += len1;

  135.         /* add known padding data */

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

  137.         if (left > 0)

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

  139. 

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

  141. 

  142.         buf_ptr += len1;

  143.         len -= len1;

  144.     }

  145. }

  146. 

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

  148. {

  149.     uint8_t *q;

  150.     q = *q_ptr;

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

  152.     *q++ = val;

  153.     *q_ptr = q;

  154. }

  155. 

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

  157.                           int version, int sec_num, int last_sec_num,

  158.                           uint8_t *buf, int len)

  159. {

  160.     uint8_t section[1024], *q;

  161.     unsigned int tot_len;

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

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

  164. 

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

  166.     /* check if not too big */

  167.     if (tot_len > 1024)

  168.         return -1;

  169. 

  170.     q = section;

  171.     *q++ = tid;

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

  173.     put16(&q, id);

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

  175.     *q++ = sec_num;

  176.     *q++ = last_sec_num;

  177.     memcpy(q, buf, len);

  178. 

  179.     mpegts_write_section(s, section, tot_len);

  180.     return 0;

  181. }

  182. 

  183. /*********************************************/

  184. /* mpegts writer */

  185. 

  186. #define DEFAULT_PROVIDER_NAME   "Libav"

  187. #define DEFAULT_SERVICE_NAME    "Service01"

  188. 

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

  190. #define DEFAULT_PES_HEADER_FREQ 16

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

  192. 

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

  194. #define SDT_RETRANS_TIME 500

  195. #define PAT_RETRANS_TIME 100

  196. #define PCR_RETRANS_TIME 20

  197. 

  198. typedef struct MpegTSWriteStream {

  199.     struct MpegTSService *service;

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

  201.     int cc;

  202.     int payload_index;

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

  204.     int64_t payload_pts;

  205.     int64_t payload_dts;

  206.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  207.     ADTSContext *adts;

  208. } MpegTSWriteStream;

  209. 

  210. static void mpegts_write_pat(AVFormatContext *s)

  211. {

  212.     MpegTSWrite *ts = s->priv_data;

  213.     MpegTSService *service;

  214.     uint8_t data[1012], *q;

  215.     int i;

  216. 

  217.     q = data;

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

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

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

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

  222.     }

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

  224.                           data, q - data);

  225. }

  226. 

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

  228. {

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

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

  231.     int val, stream_type, i;

  232. 

  233.     q = data;

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

  235. 

  236.     program_info_length_ptr = q;

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

  238. 

  239.     /* put program info here */

  240. 

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

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

  243.     program_info_length_ptr[1] = val;

  244. 

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

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

  247.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  250.         case CODEC_ID_MPEG1VIDEO:

  251.         case CODEC_ID_MPEG2VIDEO:

  252.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  253.             break;

  254.         case CODEC_ID_MPEG4:

  255.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  256.             break;

  257.         case CODEC_ID_H264:

  258.             stream_type = STREAM_TYPE_VIDEO_H264;

  259.             break;

  260.         case CODEC_ID_DIRAC:

  261.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  262.             break;

  263.         case CODEC_ID_MP2:

  264.         case CODEC_ID_MP3:

  265.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  266.             break;

  267.         case CODEC_ID_AAC:

  268.             stream_type = STREAM_TYPE_AUDIO_AAC;

  269.             break;

  270.         case CODEC_ID_AAC_LATM:

  271.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  272.             break;

  273.         case CODEC_ID_AC3:

  274.             stream_type = STREAM_TYPE_AUDIO_AC3;

  275.             break;

  276.         default:

  277.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  278.             break;

  279.         }

  280.         *q++ = stream_type;

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

  282.         desc_length_ptr = q;

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

  284. 

  285.         /* write optional descriptors here */

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

  287.         case AVMEDIA_TYPE_AUDIO:

  288.             if (lang) {

  289.                 char *p;

  290.                 char *next = lang->value;

  291.                 uint8_t *len_ptr;

  292. 

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

  294.                 len_ptr = q++;

  295.                 *len_ptr = 0;

  296. 

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

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

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

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

  301. 

  302.                     *q++ = *p++;

  303.                     *q++ = *p++;

  304.                     *q++ = *p++;

  305. 

  306.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  307.                     *q++ = 0x01;

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

  309.                     *q++ = 0x02;

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

  311.                     *q++ = 0x03;

  312.                 else

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

  314. 

  315.                     *len_ptr += 4;

  316.                 }

  317. 

  318.                 if (*len_ptr == 0)

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

  320.             }

  321.             break;

  322.         case AVMEDIA_TYPE_SUBTITLE:

  323.             {

  324.                 const char *language;

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

  326.                 *q++ = 0x59;

  327.                 *q++ = 8;

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

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

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

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

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

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

  334.                     q += 4;

  335.                 } else {

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

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

  338.                 }

  339.             }

  340.             break;

  341.         case AVMEDIA_TYPE_VIDEO:

  342.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  344.                 *q++ = 4;

  345.                 *q++ = 'd';

  346.                 *q++ = 'r';

  347.                 *q++ = 'a';

  348.                 *q++ = 'c';

  349.             }

  350.             break;

  351.         }

  352. 

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

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

  355.         desc_length_ptr[1] = val;

  356.     }

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

  358.                           data, q - data);

  359. }

  360. 

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

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

  363. {

  364.     uint8_t *q;

  365.     int len;

  366. 

  367.     q = *q_ptr;

  368.     if (!str)

  369.         len = 0;

  370.     else

  371.         len = strlen(str);

  372.     *q++ = len;

  373.     memcpy(q, str, len);

  374.     q += len;

  375.     *q_ptr = q;

  376. }

  377. 

  378. static void mpegts_write_sdt(AVFormatContext *s)

  379. {

  380.     MpegTSWrite *ts = s->priv_data;

  381.     MpegTSService *service;

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

  383.     int i, running_status, free_ca_mode, val;

  384. 

  385.     q = data;

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

  387.     *q++ = 0xff;

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

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

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

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

  392.         desc_list_len_ptr = q;

  393.         q += 2;

  394.         running_status = 4; /* running */

  395.         free_ca_mode = 0;

  396. 

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

  398.         *q++ = 0x48;

  399.         desc_len_ptr = q;

  400.         q++;

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

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

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

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

  405. 

  406.         /* fill descriptor length */

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

  408.             (q - desc_list_len_ptr - 2);

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

  410.         desc_list_len_ptr[1] = val;

  411.     }

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

  413.                           data, q - data);

  414. }

  415. 

  416. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  417.                                          int sid,

  418.                                          const char *provider_name,

  419.                                          const char *name)

  420. {

  421.     MpegTSService *service;

  422. 

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

  424.     if (!service)

  425.         return NULL;

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

  427.     service->sid = sid;

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

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

  430.     service->pcr_pid = 0x1fff;

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

  432.     return service;

  433. }

  434. 

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

  436. {

  437.     AVFormatContext *ctx = s->opaque;

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

  439. }

  440. 

  441. static int mpegts_write_header(AVFormatContext *s)

  442. {

  443.     MpegTSWrite *ts = s->priv_data;

  444.     MpegTSWriteStream *ts_st;

  445.     MpegTSService *service;

  446.     AVStream *st, *pcr_st = NULL;

  447.     AVDictionaryEntry *title, *provider;

  448.     int i, j;

  449.     const char *service_name;

  450.     const char *provider_name;

  451.     int *pids;

  452. 

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

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

  455.     /* allocate a single DVB service */

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

  457.     if (!title)

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

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

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

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

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

  463.     service->pmt.write_packet = section_write_packet;

  464.     service->pmt.opaque = s;

  465.     service->pmt.cc = 15;

  466. 

  467.     ts->pat.pid = PAT_PID;

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

  469.     ts->pat.write_packet = section_write_packet;

  470.     ts->pat.opaque = s;

  471. 

  472.     ts->sdt.pid = SDT_PID;

  473.     ts->sdt.cc = 15;

  474.     ts->sdt.write_packet = section_write_packet;

  475.     ts->sdt.opaque = s;

  476. 

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

  478.     if (!pids)

  479.         return AVERROR(ENOMEM);

  480. 

  481.     /* assign pids to each stream */

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

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

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

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

  486.         if (!ts_st)

  487.             goto fail;

  488.         st->priv_data = ts_st;

  489.         ts_st->service = service;

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

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

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

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

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

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

  496.         } else {

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

  498.             goto fail;

  499.         }

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

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

  502.             goto fail;

  503.         }

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

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

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

  507.                 goto fail;

  508.             }

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

  510.         ts_st->payload_pts = AV_NOPTS_VALUE;

  511.         ts_st->payload_dts = AV_NOPTS_VALUE;

  512.         ts_st->first_pts_check = 1;

  513.         ts_st->cc = 15;

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

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

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

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

  518.             pcr_st = st;

  519.         }

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

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

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

  523.             if (!ts_st->adts)

  524.                 return AVERROR(ENOMEM);

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

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

  527.                 return -1;

  528.         }

  529.     }

  530. 

  531.     av_free(pids);

  532. 

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

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

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

  536.         ts_st = pcr_st->priv_data;

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

  538.     }

  539. 

  540.     ts->mux_rate = s->mux_rate ? s->mux_rate : 1;

  541. 

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

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

  544.             (TS_PACKET_SIZE * 8 * 1000);

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

  546.             (TS_PACKET_SIZE * 8 * 1000);

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

  548.             (TS_PACKET_SIZE * 8 * 1000);

  549. 

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

  551.     } else {

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

  553.         ts->sdt_packet_period = 200;

  554.         ts->pat_packet_period = 40;

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

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

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

  558.                 service->pcr_packet_period =

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

  560.             } else {

  561.                 service->pcr_packet_period =

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

  563.             }

  564.         } else {

  565.             // max delta PCR 0.1s

  566.             service->pcr_packet_period =

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

  568.         }

  569.     }

  570. 

  571.     // output a PCR as soon as possible

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

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

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

  575. 

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

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

  578.     else

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

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

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

  582.            service->pcr_packet_period,

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

  584. 

  585.     avio_flush(s->pb);

  586. 

  587.     return 0;

  588. 

  589.  fail:

  590.     av_free(pids);

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

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

  593.         av_freep(&st->priv_data);

  594.     }

  595.     return -1;

  596. }

  597. 

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

  599. static void retransmit_si_info(AVFormatContext *s)

  600. {

  601.     MpegTSWrite *ts = s->priv_data;

  602.     int i;

  603. 

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

  605.         ts->sdt_packet_count = 0;

  606.         mpegts_write_sdt(s);

  607.     }

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

  609.         ts->pat_packet_count = 0;

  610.         mpegts_write_pat(s);

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

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

  613.         }

  614.     }

  615. }

  616. 

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

  618. {

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

  620.            ts->first_pcr;

  621. }

  622. 

  623. static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)

  624. {

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

  626. 

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

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

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

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

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

  632.     *buf++ = pcr_low;

  633. 

  634.     return buf;

  635. }

  636. 

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

  638. static void mpegts_insert_null_packet(AVFormatContext *s)

  639. {

  640.     uint8_t *q;

  641.     uint8_t buf[TS_PACKET_SIZE];

  642. 

  643.     q = buf;

  644.     *q++ = 0x47;

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

  646.     *q++ = 0xff;

  647.     *q++ = 0x10;

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

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

  650. }

  651. 

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

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

  654. {

  655.     MpegTSWrite *ts = s->priv_data;

  656.     MpegTSWriteStream *ts_st = st->priv_data;

  657.     uint8_t *q;

  658.     uint8_t buf[TS_PACKET_SIZE];

  659. 

  660.     q = buf;

  661.     *q++ = 0x47;

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

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

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

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

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

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

  668. 

  669.     /* PCR coded into 6 bytes */

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

  671. 

  672.     /* stuffing bytes */

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

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

  675. }

  676. 

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

  678. {

  679.     int val;

  680. 

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

  682.     *q++ = val;

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

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

  685.     *q++ = val;

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

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

  688.     *q++ = val;

  689. }

  690. 

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

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

  693.  * to exactly fill the last ts packet.

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

  695.  */

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

  697.                              const uint8_t *payload, int payload_size,

  698.                              int64_t pts, int64_t dts)

  699. {

  700.     MpegTSWriteStream *ts_st = st->priv_data;

  701.     MpegTSWrite *ts = s->priv_data;

  702.     uint8_t buf[TS_PACKET_SIZE];

  703.     uint8_t *q;

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

  705.     int afc_len, stuffing_len;

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

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

  708. 

  709.     is_start = 1;

  710.     while (payload_size > 0) {

  711.         retransmit_si_info(s);

  712. 

  713.         write_pcr = 0;

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

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

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

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

  718.                 ts_st->service->pcr_packet_period) {

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

  720.                 write_pcr = 1;

  721.             }

  722.         }

  723. 

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

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

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

  727.             if (write_pcr)

  728.                 mpegts_insert_pcr_only(s, st);

  729.             else

  730.                 mpegts_insert_null_packet(s);

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

  732.         }

  733. 

  734.         /* prepare packet header */

  735.         q = buf;

  736.         *q++ = 0x47;

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

  738.         if (is_start)

  739.             val |= 0x40;

  740.         *q++ = val;

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

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

  743.         *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);

  744.         if (write_pcr) {

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

  746.             if (ts->mux_rate > 1)

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

  748.             else

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

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

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

  752.             *q++ = 7; /* AFC length */

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

  754.             q = write_pcr_bits(q, pcr);

  755.         }

  756.         if (is_start) {

  757.             int pes_extension = 0;

  758.             /* write PES header */

  759.             *q++ = 0x00;

  760.             *q++ = 0x00;

  761.             *q++ = 0x01;

  762.             private_code = 0;

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

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

  765.                     *q++ = 0xfd;

  766.                 } else

  767.                     *q++ = 0xe0;

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

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

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

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

  772.                 *q++ = 0xc0;

  773.             } else {

  774.                 *q++ = 0xbd;

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

  776.                     private_code = 0x20;

  777.                 }

  778.             }

  779.             header_len = 0;

  780.             flags = 0;

  781.             if (pts != AV_NOPTS_VALUE) {

  782.                 header_len += 5;

  783.                 flags |= 0x80;

  784.             }

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

  786.                 header_len += 5;

  787.                 flags |= 0x40;

  788.             }

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

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

  791.                 /* set PES_extension_flag */

  792.                 pes_extension = 1;

  793.                 flags |= 0x01;

  794. 

  795.                 /*

  796.                 * One byte for PES2 extension flag +

  797.                 * one byte for extension length +

  798.                 * one byte for extension id

  799.                 */

  800.                 header_len += 3;

  801.             }

  802.             len = payload_size + header_len + 3;

  803.             if (private_code != 0)

  804.                 len++;

  805.             if (len > 0xffff)

  806.                 len = 0;

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

  808.             *q++ = len;

  809.             val = 0x80;

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

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

  812.                 val |= 0x04;

  813.             *q++ = val;

  814.             *q++ = flags;

  815.             *q++ = header_len;

  816.             if (pts != AV_NOPTS_VALUE) {

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

  818.                 q += 5;

  819.             }

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

  821.                 write_pts(q, 1, dts);

  822.                 q += 5;

  823.             }

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

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

  826.                 *q++ = flags;

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

  828.                 /*

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

  830.                 * write the extended stream id

  831.                 */

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

  833.             }

  834.             if (private_code != 0)

  835.                 *q++ = private_code;

  836.             is_start = 0;

  837.         }

  838.         /* header size */

  839.         header_len = q - buf;

  840.         /* data len */

  841.         len = TS_PACKET_SIZE - header_len;

  842.         if (len > payload_size)

  843.             len = payload_size;

  844.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  845.         if (stuffing_len > 0) {

  846.             /* add stuffing with AFC */

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

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

  849.                 afc_len = buf[4] + 1;

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

  851.                         buf + 4 + afc_len,

  852.                         header_len - (4 + afc_len));

  853.                 buf[4] += stuffing_len;

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

  855.             } else {

  856.                 /* add stuffing */

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

  858.                 buf[3] |= 0x20;

  859.                 buf[4] = stuffing_len - 1;

  860.                 if (stuffing_len >= 2) {

  861.                     buf[5] = 0x00;

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

  863.                 }

  864.             }

  865.         }

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

  867.         payload += len;

  868.         payload_size -= len;

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

  870.     }

  871.     avio_flush(s->pb);

  872. }

  873. 

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

  875. {

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

  877.     int size = pkt->size;

  878.     uint8_t *buf= pkt->data;

  879.     uint8_t *data= NULL;

  880.     MpegTSWriteStream *ts_st = st->priv_data;

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

  882.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  883. 

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

  885.         pts = pkt->pts + delay;

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

  887.         dts = pkt->dts + delay;

  888. 

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

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

  891.         return -1;

  892.     }

  893.     ts_st->first_pts_check = 0;

  894. 

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

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

  897.         uint32_t state = -1;

  898. 

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

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

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

  902.             return -1;

  903.         }

  904. 

  905.         do {

  906.             p = ff_find_start_code(p, buf_end, &state);

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

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

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

  910. 

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

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

  913.             if (!data)

  914.                 return -1;

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

  916.             AV_WB32(data, 0x00000001);

  917.             data[4] = 0x09;

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

  919.             buf  = data;

  920.             size = pkt->size+6;

  921.         }

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

  923.         if (pkt->size < 2)

  924.             return -1;

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

  926.             ADTSContext *adts = ts_st->adts;

  927.             int new_size;

  928.             if (!adts) {

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

  930.                        "and extradata missing\n");

  931.                 return -1;

  932.             }

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

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

  935.                 return -1;

  936.             data = av_malloc(new_size);

  937.             if (!data)

  938.                 return AVERROR(ENOMEM);

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

  940.             if (adts->pce_size) {

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

  942.                 adts->pce_size = 0;

  943.             }

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

  945.             buf = data;

  946.             size = new_size;

  947.         }

  948.     }

  949. 

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

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

  952.         mpegts_write_pes(s, st, buf, size, pts, dts);

  953.         av_free(data);

  954.         return 0;

  955.     }

  956. 

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

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

  959.                          ts_st->payload_pts, ts_st->payload_dts);

  960.         ts_st->payload_index = 0;

  961.     }

  962. 

  963.     if (!ts_st->payload_index) {

  964.         ts_st->payload_pts = pts;

  965.         ts_st->payload_dts = dts;

  966.     }

  967. 

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

  969.     ts_st->payload_index += size;

  970. 

  971.     av_free(data);

  972. 

  973.     return 0;

  974. }

  975. 

  976. static int mpegts_write_end(AVFormatContext *s)

  977. {

  978.     MpegTSWrite *ts = s->priv_data;

  979.     MpegTSWriteStream *ts_st;

  980.     MpegTSService *service;

  981.     AVStream *st;

  982.     int i;

  983. 

  984.     /* flush current packets */

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

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

  987.         ts_st = st->priv_data;

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

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

  990.                              ts_st->payload_pts, ts_st->payload_dts);

  991.         }

  992.         av_freep(&ts_st->adts);

  993.     }

  994.     avio_flush(s->pb);

  995. 

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

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

  998.         av_freep(&service->provider_name);

  999.         av_freep(&service->name);

  1000.         av_free(service);

  1001.     }

  1002.     av_free(ts->services);

  1003. 

  1004.     return 0;

  1005. }

  1006. 

  1007. AVOutputFormat ff_mpegts_muxer = {

  1008.     "mpegts",

  1009.     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1010.     "video/x-mpegts",

  1011.     "ts,m2t",

  1012.     sizeof(MpegTSWrite),

  1013.     CODEC_ID_MP2,

  1014.     CODEC_ID_MPEG2VIDEO,

  1015.     mpegts_write_header,

  1016.     mpegts_write_packet,

  1017.     mpegts_write_end,

  1018.     .priv_class = &mpegts_muxer_class,

  1019. };