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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.     int pes_payload_size;

  72. 

  73.     int transport_stream_id;

  74.     int original_network_id;

  75.     int service_id;

  76. 

  77.     int pmt_start_pid;

  78.     int start_pid;

  79. 

  80.     int reemit_pat_pmt;

  81. } MpegTSWrite;

  82. 

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

  84. #define DEFAULT_PES_HEADER_FREQ 16

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

  86. 

  87. static const AVOption options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

  100.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

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

  102.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  103.     { NULL },

  104. };

  105. 

  106. static const AVClass mpegts_muxer_class = {

  107.     .class_name     = "MPEGTS muxer",

  108.     .item_name      = av_default_item_name,

  109.     .option         = options,

  110.     .version        = LIBAVUTIL_VERSION_INT,

  111. };

  112. 

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

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

  115. {

  116.     unsigned int crc;

  117.     unsigned char packet[TS_PACKET_SIZE];

  118.     const unsigned char *buf_ptr;

  119.     unsigned char *q;

  120.     int first, b, len1, left;

  121. 

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

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

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

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

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

  127. 

  128.     /* send each packet */

  129.     buf_ptr = buf;

  130.     while (len > 0) {

  131.         first = (buf == buf_ptr);

  132.         q = packet;

  133.         *q++ = 0x47;

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

  135.         if (first)

  136.             b |= 0x40;

  137.         *q++ = b;

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

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

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

  141.         if (first)

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

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

  144.         if (len1 > len)

  145.             len1 = len;

  146.         memcpy(q, buf_ptr, len1);

  147.         q += len1;

  148.         /* add known padding data */

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

  150.         if (left > 0)

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

  152. 

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

  154. 

  155.         buf_ptr += len1;

  156.         len -= len1;

  157.     }

  158. }

  159. 

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

  161. {

  162.     uint8_t *q;

  163.     q = *q_ptr;

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

  165.     *q++ = val;

  166.     *q_ptr = q;

  167. }

  168. 

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

  170.                           int version, int sec_num, int last_sec_num,

  171.                           uint8_t *buf, int len)

  172. {

  173.     uint8_t section[1024], *q;

  174.     unsigned int tot_len;

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

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

  177. 

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

  179.     /* check if not too big */

  180.     if (tot_len > 1024)

  181.         return -1;

  182. 

  183.     q = section;

  184.     *q++ = tid;

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

  186.     put16(&q, id);

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

  188.     *q++ = sec_num;

  189.     *q++ = last_sec_num;

  190.     memcpy(q, buf, len);

  191. 

  192.     mpegts_write_section(s, section, tot_len);

  193.     return 0;

  194. }

  195. 

  196. /*********************************************/

  197. /* mpegts writer */

  198. 

  199. #define DEFAULT_PROVIDER_NAME   "Libav"

  200. #define DEFAULT_SERVICE_NAME    "Service01"

  201. 

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

  203. #define SDT_RETRANS_TIME 500

  204. #define PAT_RETRANS_TIME 100

  205. #define PCR_RETRANS_TIME 20

  206. 

  207. typedef struct MpegTSWriteStream {

  208.     struct MpegTSService *service;

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

  210.     int cc;

  211.     int payload_size;

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

  213.     int64_t payload_pts;

  214.     int64_t payload_dts;

  215.     int payload_flags;

  216.     uint8_t *payload;

  217.     ADTSContext *adts;

  218. } MpegTSWriteStream;

  219. 

  220. static void mpegts_write_pat(AVFormatContext *s)

  221. {

  222.     MpegTSWrite *ts = s->priv_data;

  223.     MpegTSService *service;

  224.     uint8_t data[1012], *q;

  225.     int i;

  226. 

  227.     q = data;

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

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

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

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

  232.     }

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

  234.                           data, q - data);

  235. }

  236. 

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

  238. {

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

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

  241.     int val, stream_type, i;

  242. 

  243.     q = data;

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

  245. 

  246.     program_info_length_ptr = q;

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

  248. 

  249.     /* put program info here */

  250. 

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

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

  253.     program_info_length_ptr[1] = val;

  254. 

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

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

  257.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  260.         case CODEC_ID_MPEG1VIDEO:

  261.         case CODEC_ID_MPEG2VIDEO:

  262.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  263.             break;

  264.         case CODEC_ID_MPEG4:

  265.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  266.             break;

  267.         case CODEC_ID_H264:

  268.             stream_type = STREAM_TYPE_VIDEO_H264;

  269.             break;

  270.         case CODEC_ID_DIRAC:

  271.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  272.             break;

  273.         case CODEC_ID_MP2:

  274.         case CODEC_ID_MP3:

  275.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  276.             break;

  277.         case CODEC_ID_AAC:

  278.             stream_type = STREAM_TYPE_AUDIO_AAC;

  279.             break;

  280.         case CODEC_ID_AAC_LATM:

  281.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  282.             break;

  283.         case CODEC_ID_AC3:

  284.             stream_type = STREAM_TYPE_AUDIO_AC3;

  285.             break;

  286.         default:

  287.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  288.             break;

  289.         }

  290.         *q++ = stream_type;

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

  292.         desc_length_ptr = q;

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

  294. 

  295.         /* write optional descriptors here */

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

  297.         case AVMEDIA_TYPE_AUDIO:

  298.             if (lang) {

  299.                 char *p;

  300.                 char *next = lang->value;

  301.                 uint8_t *len_ptr;

  302. 

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

  304.                 len_ptr = q++;

  305.                 *len_ptr = 0;

  306. 

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

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

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

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

  311. 

  312.                     *q++ = *p++;

  313.                     *q++ = *p++;

  314.                     *q++ = *p++;

  315. 

  316.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  317.                     *q++ = 0x01;

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

  319.                     *q++ = 0x02;

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

  321.                     *q++ = 0x03;

  322.                 else

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

  324. 

  325.                     *len_ptr += 4;

  326.                 }

  327. 

  328.                 if (*len_ptr == 0)

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

  330.             }

  331.             break;

  332.         case AVMEDIA_TYPE_SUBTITLE:

  333.             {

  334.                 const char *language;

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

  336.                 *q++ = 0x59;

  337.                 *q++ = 8;

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

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

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

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

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

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

  344.                     q += 4;

  345.                 } else {

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

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

  348.                 }

  349.             }

  350.             break;

  351.         case AVMEDIA_TYPE_VIDEO:

  352.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  354.                 *q++ = 4;

  355.                 *q++ = 'd';

  356.                 *q++ = 'r';

  357.                 *q++ = 'a';

  358.                 *q++ = 'c';

  359.             }

  360.             break;

  361.         }

  362. 

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

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

  365.         desc_length_ptr[1] = val;

  366.     }

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

  368.                           data, q - data);

  369. }

  370. 

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

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

  373. {

  374.     uint8_t *q;

  375.     int len;

  376. 

  377.     q = *q_ptr;

  378.     if (!str)

  379.         len = 0;

  380.     else

  381.         len = strlen(str);

  382.     *q++ = len;

  383.     memcpy(q, str, len);

  384.     q += len;

  385.     *q_ptr = q;

  386. }

  387. 

  388. static void mpegts_write_sdt(AVFormatContext *s)

  389. {

  390.     MpegTSWrite *ts = s->priv_data;

  391.     MpegTSService *service;

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

  393.     int i, running_status, free_ca_mode, val;

  394. 

  395.     q = data;

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

  397.     *q++ = 0xff;

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

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

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

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

  402.         desc_list_len_ptr = q;

  403.         q += 2;

  404.         running_status = 4; /* running */

  405.         free_ca_mode = 0;

  406. 

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

  408.         *q++ = 0x48;

  409.         desc_len_ptr = q;

  410.         q++;

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

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

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

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

  415. 

  416.         /* fill descriptor length */

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

  418.             (q - desc_list_len_ptr - 2);

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

  420.         desc_list_len_ptr[1] = val;

  421.     }

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

  423.                           data, q - data);

  424. }

  425. 

  426. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  427.                                          int sid,

  428.                                          const char *provider_name,

  429.                                          const char *name)

  430. {

  431.     MpegTSService *service;

  432. 

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

  434.     if (!service)

  435.         return NULL;

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

  437.     service->sid = sid;

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

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

  440.     service->pcr_pid = 0x1fff;

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

  442.     return service;

  443. }

  444. 

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

  446. {

  447.     AVFormatContext *ctx = s->opaque;

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

  449. }

  450. 

  451. static int mpegts_write_header(AVFormatContext *s)

  452. {

  453.     MpegTSWrite *ts = s->priv_data;

  454.     MpegTSWriteStream *ts_st;

  455.     MpegTSService *service;

  456.     AVStream *st, *pcr_st = NULL;

  457.     AVDictionaryEntry *title, *provider;

  458.     int i, j;

  459.     const char *service_name;

  460.     const char *provider_name;

  461.     int *pids;

  462. 

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

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

  465. 

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

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

  468.     /* allocate a single DVB service */

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

  470.     if (!title)

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

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

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

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

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

  476.     service->pmt.write_packet = section_write_packet;

  477.     service->pmt.opaque = s;

  478.     service->pmt.cc = 15;

  479. 

  480.     ts->pat.pid = PAT_PID;

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

  482.     ts->pat.write_packet = section_write_packet;

  483.     ts->pat.opaque = s;

  484. 

  485.     ts->sdt.pid = SDT_PID;

  486.     ts->sdt.cc = 15;

  487.     ts->sdt.write_packet = section_write_packet;

  488.     ts->sdt.opaque = s;

  489. 

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

  491.     if (!pids)

  492.         return AVERROR(ENOMEM);

  493. 

  494.     /* assign pids to each stream */

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

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

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

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

  499.         if (!ts_st)

  500.             goto fail;

  501.         st->priv_data = ts_st;

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

  503.         if (!ts_st->payload)

  504.             goto fail;

  505.         ts_st->service = service;

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

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

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

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

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

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

  512.         } else {

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

  514.             goto fail;

  515.         }

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

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

  518.             goto fail;

  519.         }

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

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

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

  523.                 goto fail;

  524.             }

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

  526.         ts_st->payload_pts = AV_NOPTS_VALUE;

  527.         ts_st->payload_dts = AV_NOPTS_VALUE;

  528.         ts_st->first_pts_check = 1;

  529.         ts_st->cc = 15;

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

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

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

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

  534.             pcr_st = st;

  535.         }

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

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

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

  539.             if (!ts_st->adts)

  540.                 goto fail;

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

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

  543.                 goto fail;

  544.         }

  545.     }

  546. 

  547.     av_free(pids);

  548. 

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

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

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

  552.         ts_st = pcr_st->priv_data;

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

  554.     }

  555. 

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

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

  558.             (TS_PACKET_SIZE * 8 * 1000);

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

  560.             (TS_PACKET_SIZE * 8 * 1000);

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

  562.             (TS_PACKET_SIZE * 8 * 1000);

  563. 

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

  565.     } else {

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

  567.         ts->sdt_packet_period = 200;

  568.         ts->pat_packet_period = 40;

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

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

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

  572.                 service->pcr_packet_period =

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

  574.             } else {

  575.                 service->pcr_packet_period =

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

  577.             }

  578.         } else {

  579.             // max delta PCR 0.1s

  580.             service->pcr_packet_period =

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

  582.         }

  583.     }

  584. 

  585.     // output a PCR as soon as possible

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

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

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

  589. 

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

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

  592.     else

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

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

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

  596.            service->pcr_packet_period,

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

  598. 

  599.     avio_flush(s->pb);

  600. 

  601.     return 0;

  602. 

  603.  fail:

  604.     av_free(pids);

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

  606.         MpegTSWriteStream *ts_st;

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

  608.         ts_st = st->priv_data;

  609.         if (ts_st) {

  610.             av_freep(&ts_st->payload);

  611.             av_freep(&ts_st->adts);

  612.         }

  613.         av_freep(&st->priv_data);

  614.     }

  615.     return -1;

  616. }

  617. 

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

  619. static void retransmit_si_info(AVFormatContext *s)

  620. {

  621.     MpegTSWrite *ts = s->priv_data;

  622.     int i;

  623. 

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

  625.         ts->sdt_packet_count = 0;

  626.         mpegts_write_sdt(s);

  627.     }

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

  629.         ts->pat_packet_count = 0;

  630.         mpegts_write_pat(s);

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

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

  633.         }

  634.     }

  635. }

  636. 

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

  638. {

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

  640.            ts->first_pcr;

  641. }

  642. 

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

  644. {

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

  646. 

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

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

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

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

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

  652.     *buf++ = pcr_low;

  653. 

  654.     return 6;

  655. }

  656. 

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

  658. static void mpegts_insert_null_packet(AVFormatContext *s)

  659. {

  660.     uint8_t *q;

  661.     uint8_t buf[TS_PACKET_SIZE];

  662. 

  663.     q = buf;

  664.     *q++ = 0x47;

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

  666.     *q++ = 0xff;

  667.     *q++ = 0x10;

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

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

  670. }

  671. 

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

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

  674. {

  675.     MpegTSWrite *ts = s->priv_data;

  676.     MpegTSWriteStream *ts_st = st->priv_data;

  677.     uint8_t *q;

  678.     uint8_t buf[TS_PACKET_SIZE];

  679. 

  680.     q = buf;

  681.     *q++ = 0x47;

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

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

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

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

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

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

  688. 

  689.     /* PCR coded into 6 bytes */

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

  691. 

  692.     /* stuffing bytes */

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

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

  695. }

  696. 

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

  698. {

  699.     int val;

  700. 

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

  702.     *q++ = val;

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

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

  705.     *q++ = val;

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

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

  708.     *q++ = val;

  709. }

  710. 

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

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

  713. {

  714.     // expect at least one flag to set

  715.     assert(flag);

  716. 

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

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

  719.         pkt[3] |= 0x20;

  720.         // 1 byte length, no flags

  721.         pkt[4] = 1;

  722.         pkt[5] = 0;

  723.     }

  724.     pkt[5] |= flag;

  725. }

  726. 

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

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

  729. {

  730.     // expect already existing adaptation field

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

  732.     pkt[4] += size;

  733. }

  734. 

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

  736. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  737. {

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

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

  740.     else

  741.         return pkt + 4;

  742. }

  743. 

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

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

  746.  * to exactly fill the last ts packet.

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

  748.  */

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

  750.                              const uint8_t *payload, int payload_size,

  751.                              int64_t pts, int64_t dts, int key)

  752. {

  753.     MpegTSWriteStream *ts_st = st->priv_data;

  754.     MpegTSWrite *ts = s->priv_data;

  755.     uint8_t buf[TS_PACKET_SIZE];

  756.     uint8_t *q;

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

  758.     int afc_len, stuffing_len;

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

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

  761. 

  762.     is_start = 1;

  763.     while (payload_size > 0) {

  764.         retransmit_si_info(s);

  765. 

  766.         write_pcr = 0;

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

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

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

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

  771.                 ts_st->service->pcr_packet_period) {

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

  773.                 write_pcr = 1;

  774.             }

  775.         }

  776. 

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

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

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

  780.             if (write_pcr)

  781.                 mpegts_insert_pcr_only(s, st);

  782.             else

  783.                 mpegts_insert_null_packet(s);

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

  785.         }

  786. 

  787.         /* prepare packet header */

  788.         q = buf;

  789.         *q++ = 0x47;

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

  791.         if (is_start)

  792.             val |= 0x40;

  793.         *q++ = val;

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

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

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

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

  798.             // set Random Access for key frames

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

  800.                 write_pcr = 1;

  801.             set_af_flag(buf, 0x40);

  802.             q = get_ts_payload_start(buf);

  803.         }

  804.         if (write_pcr) {

  805.             set_af_flag(buf, 0x10);

  806.             q = get_ts_payload_start(buf);

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

  808.             if (ts->mux_rate > 1)

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

  810.             else

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

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

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

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

  815.             q = get_ts_payload_start(buf);

  816.         }

  817.         if (is_start) {

  818.             int pes_extension = 0;

  819.             /* write PES header */

  820.             *q++ = 0x00;

  821.             *q++ = 0x00;

  822.             *q++ = 0x01;

  823.             private_code = 0;

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

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

  826.                     *q++ = 0xfd;

  827.                 } else

  828.                     *q++ = 0xe0;

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

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

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

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

  833.                 *q++ = 0xc0;

  834.             } else {

  835.                 *q++ = 0xbd;

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

  837.                     private_code = 0x20;

  838.                 }

  839.             }

  840.             header_len = 0;

  841.             flags = 0;

  842.             if (pts != AV_NOPTS_VALUE) {

  843.                 header_len += 5;

  844.                 flags |= 0x80;

  845.             }

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

  847.                 header_len += 5;

  848.                 flags |= 0x40;

  849.             }

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

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

  852.                 /* set PES_extension_flag */

  853.                 pes_extension = 1;

  854.                 flags |= 0x01;

  855. 

  856.                 /*

  857.                 * One byte for PES2 extension flag +

  858.                 * one byte for extension length +

  859.                 * one byte for extension id

  860.                 */

  861.                 header_len += 3;

  862.             }

  863.             len = payload_size + header_len + 3;

  864.             if (private_code != 0)

  865.                 len++;

  866.             if (len > 0xffff)

  867.                 len = 0;

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

  869.             *q++ = len;

  870.             val = 0x80;

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

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

  873.                 val |= 0x04;

  874.             *q++ = val;

  875.             *q++ = flags;

  876.             *q++ = header_len;

  877.             if (pts != AV_NOPTS_VALUE) {

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

  879.                 q += 5;

  880.             }

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

  882.                 write_pts(q, 1, dts);

  883.                 q += 5;

  884.             }

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

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

  887.                 *q++ = flags;

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

  889.                 /*

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

  891.                 * write the extended stream id

  892.                 */

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

  894.             }

  895.             if (private_code != 0)

  896.                 *q++ = private_code;

  897.             is_start = 0;

  898.         }

  899.         /* header size */

  900.         header_len = q - buf;

  901.         /* data len */

  902.         len = TS_PACKET_SIZE - header_len;

  903.         if (len > payload_size)

  904.             len = payload_size;

  905.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  906.         if (stuffing_len > 0) {

  907.             /* add stuffing with AFC */

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

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

  910.                 afc_len = buf[4] + 1;

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

  912.                         buf + 4 + afc_len,

  913.                         header_len - (4 + afc_len));

  914.                 buf[4] += stuffing_len;

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

  916.             } else {

  917.                 /* add stuffing */

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

  919.                 buf[3] |= 0x20;

  920.                 buf[4] = stuffing_len - 1;

  921.                 if (stuffing_len >= 2) {

  922.                     buf[5] = 0x00;

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

  924.                 }

  925.             }

  926.         }

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

  928.         payload += len;

  929.         payload_size -= len;

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

  931.     }

  932.     avio_flush(s->pb);

  933. }

  934. 

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

  936. {

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

  938.     int size = pkt->size;

  939.     uint8_t *buf= pkt->data;

  940.     uint8_t *data= NULL;

  941.     MpegTSWrite *ts = s->priv_data;

  942.     MpegTSWriteStream *ts_st = st->priv_data;

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

  944.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  945. 

  946.     if (ts->reemit_pat_pmt) {

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

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

  949.         ts->reemit_pat_pmt = 0;

  950.     }

  951. 

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

  953.         pts = pkt->pts + delay;

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

  955.         dts = pkt->dts + delay;

  956. 

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

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

  959.         return -1;

  960.     }

  961.     ts_st->first_pts_check = 0;

  962. 

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

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

  965.         uint32_t state = -1;

  966. 

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

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

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

  970.             return -1;

  971.         }

  972. 

  973.         do {

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

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

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

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

  978. 

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

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

  981.             if (!data)

  982.                 return -1;

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

  984.             AV_WB32(data, 0x00000001);

  985.             data[4] = 0x09;

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

  987.             buf  = data;

  988.             size = pkt->size+6;

  989.         }

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

  991.         if (pkt->size < 2)

  992.             return -1;

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

  994.             ADTSContext *adts = ts_st->adts;

  995.             int new_size, err;

  996.             if (!adts) {

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

  998.                        "and extradata missing\n");

  999.                 return -1;

  1000.             }

  1001.             new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;

  1002.             if ((unsigned)new_size >= INT_MAX)

  1003.                 return -1;

  1004.             data = av_malloc(new_size);

  1005.             if (!data)

  1006.                 return AVERROR(ENOMEM);

  1007.             err = ff_adts_write_frame_header(adts, data, pkt->size,

  1008.                                              adts->pce_size);

  1009.             if (err < 0) {

  1010.                 av_free(data);

  1011.                 return err;

  1012.             }

  1013.             if (adts->pce_size) {

  1014.                 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);

  1015.                 adts->pce_size = 0;

  1016.             }

  1017.             memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);

  1018.             buf = data;

  1019.             size = new_size;

  1020.         }

  1021.     }

  1022. 

  1023.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  1024.         // for video and subtitle, write a single pes packet

  1025.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1026.         av_free(data);

  1027.         return 0;

  1028.     }

  1029. 

  1030.     if (ts_st->payload_size + size > ts->pes_payload_size) {

  1031.         if (ts_st->payload_size) {

  1032.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1033.                              ts_st->payload_pts, ts_st->payload_dts,

  1034.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1035.             ts_st->payload_size = 0;

  1036.         }

  1037.         if (size > ts->pes_payload_size) {

  1038.             mpegts_write_pes(s, st, buf, size, pts, dts,

  1039.                              pkt->flags & AV_PKT_FLAG_KEY);

  1040.             av_free(data);

  1041.             return 0;

  1042.         }

  1043.     }

  1044. 

  1045.     if (!ts_st->payload_size) {

  1046.         ts_st->payload_pts = pts;

  1047.         ts_st->payload_dts = dts;

  1048.         ts_st->payload_flags = pkt->flags;

  1049.     }

  1050. 

  1051.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1052.     ts_st->payload_size += size;

  1053. 

  1054.     av_free(data);

  1055. 

  1056.     return 0;

  1057. }

  1058. 

  1059. static int mpegts_write_end(AVFormatContext *s)

  1060. {

  1061.     MpegTSWrite *ts = s->priv_data;

  1062.     MpegTSWriteStream *ts_st;

  1063.     MpegTSService *service;

  1064.     AVStream *st;

  1065.     int i;

  1066. 

  1067.     /* flush current packets */

  1068.     for(i = 0; i < s->nb_streams; i++) {

  1069.         st = s->streams[i];

  1070.         ts_st = st->priv_data;

  1071.         if (ts_st->payload_size > 0) {

  1072.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1073.                              ts_st->payload_pts, ts_st->payload_dts,

  1074.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1075.         }

  1076.         av_freep(&ts_st->payload);

  1077.         av_freep(&ts_st->adts);

  1078.     }

  1079.     avio_flush(s->pb);

  1080. 

  1081.     for(i = 0; i < ts->nb_services; i++) {

  1082.         service = ts->services[i];

  1083.         av_freep(&service->provider_name);

  1084.         av_freep(&service->name);

  1085.         av_free(service);

  1086.     }

  1087.     av_free(ts->services);

  1088. 

  1089.     return 0;

  1090. }

  1091. 

  1092. AVOutputFormat ff_mpegts_muxer = {

  1093.     .name              = "mpegts",

  1094.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1095.     .mime_type         = "video/x-mpegts",

  1096.     .extensions        = "ts,m2t",

  1097.     .priv_data_size    = sizeof(MpegTSWrite),

  1098.     .audio_codec       = CODEC_ID_MP2,

  1099.     .video_codec       = CODEC_ID_MPEG2VIDEO,

  1100.     .write_header      = mpegts_write_header,

  1101.     .write_packet      = mpegts_write_packet,

  1102.     .write_trailer     = mpegts_write_end,

  1103.     .priv_class = &mpegts_muxer_class,

  1104. };