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FFmpeg/libavformat/mpegtsenc.c

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  1. /*

  2.  * MPEG2 transport stream (aka DVB) muxer

  3.  * Copyright (c) 2003 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "libavutil/bswap.h"

  23. #include "libavutil/crc.h"

  24. #include "libavutil/dict.h"

  25. #include "libavutil/mathematics.h"

  26. #include "libavutil/opt.h"

  27. #include "libavutil/avassert.h"

  28. #include "libavcodec/mpegvideo.h"

  29. #include "avformat.h"

  30. #include "internal.h"

  31. #include "mpegts.h"

  32. #include "adts.h"

  33. 

  34. #define PCR_TIME_BASE 27000000

  35. 

  36. /* write DVB SI sections */

  37. 

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

  39. /* mpegts section writer */

  40. 

  41. typedef struct MpegTSSection {

  42.     int pid;

  43.     int cc;

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

  45.     void *opaque;

  46. } MpegTSSection;

  47. 

  48. typedef struct MpegTSService {

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

  50.     int sid;           /* service ID */

  51.     char *name;

  52.     char *provider_name;

  53.     int pcr_pid;

  54.     int pcr_packet_count;

  55.     int pcr_packet_period;

  56. } MpegTSService;

  57. 

  58. typedef struct MpegTSWrite {

  59.     const AVClass *av_class;

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

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

  62.     MpegTSService **services;

  63.     int sdt_packet_count;

  64.     int sdt_packet_period;

  65.     int pat_packet_count;

  66.     int pat_packet_period;

  67.     int nb_services;

  68.     int onid;

  69.     int tsid;

  70.     int64_t first_pcr;

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

  72. 

  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.     int m2ts_mode;

  80. } MpegTSWrite;

  81. 

  82. static const AVOption options[] = {

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

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

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

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

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

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

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

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

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

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

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

  94.         offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.dbl = -1 },

  95.         -1,1, AV_OPT_FLAG_ENCODING_PARAM},

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

  97.     { NULL },

  98. };

  99. 

  100. static const AVClass mpegts_muxer_class = {

  101.     .class_name     = "MPEGTS muxer",

  102.     .item_name      = av_default_item_name,

  103.     .option         = options,

  104.     .version        = LIBAVUTIL_VERSION_INT,

  105. };

  106. 

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

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

  109. {

  110.     unsigned int crc;

  111.     unsigned char packet[TS_PACKET_SIZE];

  112.     const unsigned char *buf_ptr;

  113.     unsigned char *q;

  114.     int first, b, len1, left;

  115. 

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

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

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

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

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

  121. 

  122.     /* send each packet */

  123.     buf_ptr = buf;

  124.     while (len > 0) {

  125.         first = (buf == buf_ptr);

  126.         q = packet;

  127.         *q++ = 0x47;

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

  129.         if (first)

  130.             b |= 0x40;

  131.         *q++ = b;

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

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

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

  135.         if (first)

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

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

  138.         if (len1 > len)

  139.             len1 = len;

  140.         memcpy(q, buf_ptr, len1);

  141.         q += len1;

  142.         /* add known padding data */

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

  144.         if (left > 0)

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

  146. 

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

  148. 

  149.         buf_ptr += len1;

  150.         len -= len1;

  151.     }

  152. }

  153. 

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

  155. {

  156.     uint8_t *q;

  157.     q = *q_ptr;

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

  159.     *q++ = val;

  160.     *q_ptr = q;

  161. }

  162. 

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

  164.                           int version, int sec_num, int last_sec_num,

  165.                           uint8_t *buf, int len)

  166. {

  167.     uint8_t section[1024], *q;

  168.     unsigned int tot_len;

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

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

  171. 

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

  173.     /* check if not too big */

  174.     if (tot_len > 1024)

  175.         return -1;

  176. 

  177.     q = section;

  178.     *q++ = tid;

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

  180.     put16(&q, id);

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

  182.     *q++ = sec_num;

  183.     *q++ = last_sec_num;

  184.     memcpy(q, buf, len);

  185. 

  186.     mpegts_write_section(s, section, tot_len);

  187.     return 0;

  188. }

  189. 

  190. /*********************************************/

  191. /* mpegts writer */

  192. 

  193. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  194. #define DEFAULT_SERVICE_NAME    "Service01"

  195. 

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

  197. #define DEFAULT_PES_HEADER_FREQ 16

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

  199. 

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

  201. #define SDT_RETRANS_TIME 500

  202. #define PAT_RETRANS_TIME 100

  203. #define PCR_RETRANS_TIME 20

  204. 

  205. typedef struct MpegTSWriteStream {

  206.     struct MpegTSService *service;

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

  208.     int cc;

  209.     int payload_index;

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

  211.     int64_t payload_pts;

  212.     int64_t payload_dts;

  213.     int payload_flags;

  214.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  215.     ADTSContext *adts;

  216. } MpegTSWriteStream;

  217. 

  218. static void mpegts_write_pat(AVFormatContext *s)

  219. {

  220.     MpegTSWrite *ts = s->priv_data;

  221.     MpegTSService *service;

  222.     uint8_t data[1012], *q;

  223.     int i;

  224. 

  225.     q = data;

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

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

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

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

  230.     }

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

  232.                           data, q - data);

  233. }

  234. 

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

  236. {

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

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

  239.     int val, stream_type, i;

  240. 

  241.     q = data;

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

  243. 

  244.     program_info_length_ptr = q;

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

  246. 

  247.     /* put program info here */

  248. 

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

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

  251.     program_info_length_ptr[1] = val;

  252. 

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

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

  255.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  258.         case CODEC_ID_MPEG1VIDEO:

  259.         case CODEC_ID_MPEG2VIDEO:

  260.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  261.             break;

  262.         case CODEC_ID_MPEG4:

  263.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  264.             break;

  265.         case CODEC_ID_H264:

  266.             stream_type = STREAM_TYPE_VIDEO_H264;

  267.             break;

  268.         case CODEC_ID_DIRAC:

  269.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  270.             break;

  271.         case CODEC_ID_MP2:

  272.         case CODEC_ID_MP3:

  273.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  274.             break;

  275.         case CODEC_ID_AAC:

  276.             stream_type = STREAM_TYPE_AUDIO_AAC;

  277.             break;

  278.         case CODEC_ID_AAC_LATM:

  279.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  280.             break;

  281.         case CODEC_ID_AC3:

  282.             stream_type = STREAM_TYPE_AUDIO_AC3;

  283.             break;

  284.         default:

  285.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  286.             break;

  287.         }

  288.         *q++ = stream_type;

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

  290.         desc_length_ptr = q;

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

  292. 

  293.         /* write optional descriptors here */

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

  295.         case AVMEDIA_TYPE_AUDIO:

  296.             if (lang) {

  297.                 char *p;

  298.                 char *next = lang->value;

  299.                 uint8_t *len_ptr;

  300. 

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

  302.                 len_ptr = q++;

  303.                 *len_ptr = 0;

  304. 

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

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

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

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

  309. 

  310.                     *q++ = *p++;

  311.                     *q++ = *p++;

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

  313. 

  314.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  315.                     *q++ = 0x01;

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

  317.                     *q++ = 0x02;

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

  319.                     *q++ = 0x03;

  320.                 else

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

  322. 

  323.                     *len_ptr += 4;

  324.                 }

  325. 

  326.                 if (*len_ptr == 0)

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

  328.             }

  329.             break;

  330.         case AVMEDIA_TYPE_SUBTITLE:

  331.             {

  332.                 const char *language;

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

  334.                 *q++ = 0x59;

  335.                 *q++ = 8;

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

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

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

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

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

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

  342.                     q += 4;

  343.                 } else {

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

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

  346.                 }

  347.             }

  348.             break;

  349.         case AVMEDIA_TYPE_VIDEO:

  350.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  352.                 *q++ = 4;

  353.                 *q++ = 'd';

  354.                 *q++ = 'r';

  355.                 *q++ = 'a';

  356.                 *q++ = 'c';

  357.             }

  358.             break;

  359.         }

  360. 

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

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

  363.         desc_length_ptr[1] = val;

  364.     }

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

  366.                           data, q - data);

  367. }

  368. 

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

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

  371. {

  372.     uint8_t *q;

  373.     int len;

  374. 

  375.     q = *q_ptr;

  376.     if (!str)

  377.         len = 0;

  378.     else

  379.         len = strlen(str);

  380.     *q++ = len;

  381.     memcpy(q, str, len);

  382.     q += len;

  383.     *q_ptr = q;

  384. }

  385. 

  386. static void mpegts_write_sdt(AVFormatContext *s)

  387. {

  388.     MpegTSWrite *ts = s->priv_data;

  389.     MpegTSService *service;

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

  391.     int i, running_status, free_ca_mode, val;

  392. 

  393.     q = data;

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

  395.     *q++ = 0xff;

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

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

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

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

  400.         desc_list_len_ptr = q;

  401.         q += 2;

  402.         running_status = 4; /* running */

  403.         free_ca_mode = 0;

  404. 

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

  406.         *q++ = 0x48;

  407.         desc_len_ptr = q;

  408.         q++;

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

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

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

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

  413. 

  414.         /* fill descriptor length */

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

  416.             (q - desc_list_len_ptr - 2);

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

  418.         desc_list_len_ptr[1] = val;

  419.     }

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

  421.                           data, q - data);

  422. }

  423. 

  424. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  425.                                          int sid,

  426.                                          const char *provider_name,

  427.                                          const char *name)

  428. {

  429.     MpegTSService *service;

  430. 

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

  432.     if (!service)

  433.         return NULL;

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

  435.     service->sid = sid;

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

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

  438.     service->pcr_pid = 0x1fff;

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

  440.     return service;

  441. }

  442. 

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

  444. {

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

  446.            ts->first_pcr;

  447. }

  448. 

  449. static void mpegts_prefix_m2ts_header(AVFormatContext *s)

  450. {

  451.     MpegTSWrite *ts = s->priv_data;

  452.     if (ts->m2ts_mode) {

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

  454.         uint32_t tp_extra_header = pcr % 0x3fffffff;

  455.         tp_extra_header = AV_RB32(&tp_extra_header);

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

  457.                 sizeof(tp_extra_header));

  458.     }

  459. }

  460. 

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

  462. {

  463.     AVFormatContext *ctx = s->opaque;

  464.     mpegts_prefix_m2ts_header(ctx);

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

  466. }

  467. 

  468. static int mpegts_write_header(AVFormatContext *s)

  469. {

  470.     MpegTSWrite *ts = s->priv_data;

  471.     MpegTSWriteStream *ts_st;

  472.     MpegTSService *service;

  473.     AVStream *st, *pcr_st = NULL;

  474.     AVDictionaryEntry *title, *provider;

  475.     int i, j;

  476.     const char *service_name;

  477.     const char *provider_name;

  478.     int *pids;

  479. 

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

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

  482.     /* allocate a single DVB service */

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

  484.     if (!title)

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

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

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

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

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

  490.     service->pmt.write_packet = section_write_packet;

  491.     service->pmt.opaque = s;

  492.     service->pmt.cc = 15;

  493. 

  494.     ts->pat.pid = PAT_PID;

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

  496.     ts->pat.write_packet = section_write_packet;

  497.     ts->pat.opaque = s;

  498. 

  499.     ts->sdt.pid = SDT_PID;

  500.     ts->sdt.cc = 15;

  501.     ts->sdt.write_packet = section_write_packet;

  502.     ts->sdt.opaque = s;

  503. 

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

  505.     if (!pids)

  506.         return AVERROR(ENOMEM);

  507. 

  508.     /* assign pids to each stream */

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

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

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

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

  513.         if (!ts_st)

  514.             goto fail;

  515.         st->priv_data = ts_st;

  516.         ts_st->service = service;

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

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

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

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

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

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

  523.         } else {

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

  525.             goto fail;

  526.         }

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

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

  529.             goto fail;

  530.         }

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

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

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

  534.                 goto fail;

  535.             }

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

  537.         ts_st->payload_pts = AV_NOPTS_VALUE;

  538.         ts_st->payload_dts = AV_NOPTS_VALUE;

  539.         ts_st->first_pts_check = 1;

  540.         ts_st->cc = 15;

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

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

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

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

  545.             pcr_st = st;

  546.         }

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

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

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

  550.             if (!ts_st->adts)

  551.                 return AVERROR(ENOMEM);

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

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

  554.                 return -1;

  555.         }

  556.     }

  557. 

  558.     av_free(pids);

  559. 

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

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

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

  563.         ts_st = pcr_st->priv_data;

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

  565.     }

  566. 

  567. #if FF_API_MUXRATE

  568.     if (s->mux_rate)

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

  570. #endif

  571. 

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

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

  574.             (TS_PACKET_SIZE * 8 * 1000);

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

  576.             (TS_PACKET_SIZE * 8 * 1000);

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

  578.             (TS_PACKET_SIZE * 8 * 1000);

  579. 

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

  581.     } else {

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

  583.         ts->sdt_packet_period = 200;

  584.         ts->pat_packet_period = 40;

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

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

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

  588.                 service->pcr_packet_period =

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

  590.             } else {

  591.                 service->pcr_packet_period =

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

  593.             }

  594.         } else {

  595.             // max delta PCR 0.1s

  596.             service->pcr_packet_period =

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

  598.         }

  599.     }

  600. 

  601.     // output a PCR as soon as possible

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

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

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

  605. 

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

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

  608.     else

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

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

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

  612.            service->pcr_packet_period,

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

  614. 

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

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

  617.             ts->m2ts_mode = 1;

  618.         } else {

  619.             ts->m2ts_mode = 0;

  620.         }

  621.     }

  622. 

  623.     avio_flush(s->pb);

  624. 

  625.     return 0;

  626. 

  627.  fail:

  628.     av_free(pids);

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

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

  631.         av_freep(&st->priv_data);

  632.     }

  633.     return -1;

  634. }

  635. 

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

  637. static void retransmit_si_info(AVFormatContext *s)

  638. {

  639.     MpegTSWrite *ts = s->priv_data;

  640.     int i;

  641. 

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

  643.         ts->sdt_packet_count = 0;

  644.         mpegts_write_sdt(s);

  645.     }

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

  647.         ts->pat_packet_count = 0;

  648.         mpegts_write_pat(s);

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

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

  651.         }

  652.     }

  653. }

  654. 

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

  656. {

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

  658. 

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

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

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

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

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

  664.     *buf++ = pcr_low;

  665. 

  666.     return 6;

  667. }

  668. 

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

  670. static void mpegts_insert_null_packet(AVFormatContext *s)

  671. {

  672.     uint8_t *q;

  673.     uint8_t buf[TS_PACKET_SIZE];

  674. 

  675.     q = buf;

  676.     *q++ = 0x47;

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

  678.     *q++ = 0xff;

  679.     *q++ = 0x10;

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

  681.     mpegts_prefix_m2ts_header(s);

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

  683. }

  684. 

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

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

  687. {

  688.     MpegTSWrite *ts = s->priv_data;

  689.     MpegTSWriteStream *ts_st = st->priv_data;

  690.     uint8_t *q;

  691.     uint8_t buf[TS_PACKET_SIZE];

  692. 

  693.     q = buf;

  694.     *q++ = 0x47;

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

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

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

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

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

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

  701. 

  702.     /* PCR coded into 6 bytes */

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

  704. 

  705.     /* stuffing bytes */

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

  707.     mpegts_prefix_m2ts_header(s);

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

  709. }

  710. 

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

  712. {

  713.     int val;

  714. 

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

  716.     *q++ = val;

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

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

  719.     *q++ = val;

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

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

  722.     *q++ = val;

  723. }

  724. 

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

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

  727. {

  728.     // expect at least one flag to set

  729.     assert(flag);

  730. 

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

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

  733.         pkt[3] |= 0x20;

  734.         // 1 byte length, no flags

  735.         pkt[4] = 1;

  736.         pkt[5] = 0;

  737.     }

  738.     pkt[5] |= flag;

  739. }

  740. 

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

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

  743. {

  744.     // expect already existing adaptation field

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

  746.     pkt[4] += size;

  747. }

  748. 

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

  750. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  751. {

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

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

  754.     else

  755.         return pkt + 4;

  756. }

  757. 

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

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

  760.  * to exactly fill the last ts packet.

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

  762.  */

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

  764.                              const uint8_t *payload, int payload_size,

  765.                              int64_t pts, int64_t dts, int key)

  766. {

  767.     MpegTSWriteStream *ts_st = st->priv_data;

  768.     MpegTSWrite *ts = s->priv_data;

  769.     uint8_t buf[TS_PACKET_SIZE];

  770.     uint8_t *q;

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

  772.     int afc_len, stuffing_len;

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

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

  775. 

  776.     is_start = 1;

  777.     while (payload_size > 0) {

  778.         retransmit_si_info(s);

  779. 

  780.         write_pcr = 0;

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

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

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

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

  785.                 ts_st->service->pcr_packet_period) {

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

  787.                 write_pcr = 1;

  788.             }

  789.         }

  790. 

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

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

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

  794.             if (write_pcr)

  795.                 mpegts_insert_pcr_only(s, st);

  796.             else

  797.                 mpegts_insert_null_packet(s);

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

  799.         }

  800. 

  801.         /* prepare packet header */

  802.         q = buf;

  803.         *q++ = 0x47;

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

  805.         if (is_start)

  806.             val |= 0x40;

  807.         *q++ = val;

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

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

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

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

  812.             // set Random Access for key frames

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

  814.                 write_pcr = 1;

  815.             set_af_flag(buf, 0x40);

  816.             q = get_ts_payload_start(buf);

  817.         }

  818.         if (write_pcr) {

  819.             set_af_flag(buf, 0x10);

  820.             q = get_ts_payload_start(buf);

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

  822.             if (ts->mux_rate > 1)

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

  824.             else

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

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

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

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

  829.             q = get_ts_payload_start(buf);

  830.         }

  831.         if (is_start) {

  832.             int pes_extension = 0;

  833.             /* write PES header */

  834.             *q++ = 0x00;

  835.             *q++ = 0x00;

  836.             *q++ = 0x01;

  837.             private_code = 0;

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

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

  840.                     *q++ = 0xfd;

  841.                 } else

  842.                     *q++ = 0xe0;

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

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

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

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

  847.                 *q++ = 0xc0;

  848.             } else {

  849.                 *q++ = 0xbd;

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

  851.                     private_code = 0x20;

  852.                 }

  853.             }

  854.             header_len = 0;

  855.             flags = 0;

  856.             if (pts != AV_NOPTS_VALUE) {

  857.                 header_len += 5;

  858.                 flags |= 0x80;

  859.             }

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

  861.                 header_len += 5;

  862.                 flags |= 0x40;

  863.             }

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

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

  866.                 /* set PES_extension_flag */

  867.                 pes_extension = 1;

  868.                 flags |= 0x01;

  869. 

  870.                 /*

  871.                 * One byte for PES2 extension flag +

  872.                 * one byte for extension length +

  873.                 * one byte for extension id

  874.                 */

  875.                 header_len += 3;

  876.             }

  877.             len = payload_size + header_len + 3;

  878.             if (private_code != 0)

  879.                 len++;

  880.             if (len > 0xffff)

  881.                 len = 0;

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

  883.             *q++ = len;

  884.             val = 0x80;

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

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

  887.                 val |= 0x04;

  888.             *q++ = val;

  889.             *q++ = flags;

  890.             *q++ = header_len;

  891.             if (pts != AV_NOPTS_VALUE) {

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

  893.                 q += 5;

  894.             }

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

  896.                 write_pts(q, 1, dts);

  897.                 q += 5;

  898.             }

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

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

  901.                 *q++ = flags;

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

  903.                 /*

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

  905.                 * write the extended stream id

  906.                 */

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

  908.             }

  909.             if (private_code != 0)

  910.                 *q++ = private_code;

  911.             is_start = 0;

  912.         }

  913.         /* header size */

  914.         header_len = q - buf;

  915.         /* data len */

  916.         len = TS_PACKET_SIZE - header_len;

  917.         if (len > payload_size)

  918.             len = payload_size;

  919.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  920.         if (stuffing_len > 0) {

  921.             /* add stuffing with AFC */

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

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

  924.                 afc_len = buf[4] + 1;

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

  926.                         buf + 4 + afc_len,

  927.                         header_len - (4 + afc_len));

  928.                 buf[4] += stuffing_len;

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

  930.             } else {

  931.                 /* add stuffing */

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

  933.                 buf[3] |= 0x20;

  934.                 buf[4] = stuffing_len - 1;

  935.                 if (stuffing_len >= 2) {

  936.                     buf[5] = 0x00;

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

  938.                 }

  939.             }

  940.         }

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

  942.         payload += len;

  943.         payload_size -= len;

  944.         mpegts_prefix_m2ts_header(s);

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

  946.     }

  947.     avio_flush(s->pb);

  948. }

  949. 

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

  951. {

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

  953.     int size = pkt->size;

  954.     uint8_t *buf= pkt->data;

  955.     uint8_t *data= NULL;

  956.     MpegTSWriteStream *ts_st = st->priv_data;

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

  958.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  959. 

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

  961.         pts = pkt->pts + delay;

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

  963.         dts = pkt->dts + delay;

  964. 

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

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

  967.         return -1;

  968.     }

  969.     ts_st->first_pts_check = 0;

  970. 

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

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

  973.         uint32_t state = -1;

  974. 

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

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

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

  978.             return -1;

  979.         }

  980. 

  981.         do {

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

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

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

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

  986. 

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

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

  989.             if (!data)

  990.                 return -1;

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

  992.             AV_WB32(data, 0x00000001);

  993.             data[4] = 0x09;

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

  995.             buf  = data;

  996.             size = pkt->size+6;

  997.         }

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

  999.         if (pkt->size < 2)

  1000.             return -1;

  1001.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {

  1002.             ADTSContext *adts = ts_st->adts;

  1003.             int new_size;

  1004.             if (!adts) {

  1005.                 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "

  1006.                        "and extradata missing\n");

  1007.                 return -1;

  1008.             }

  1009.             new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;

  1010.             if ((unsigned)new_size >= INT_MAX)

  1011.                 return -1;

  1012.             data = av_malloc(new_size);

  1013.             if (!data)

  1014.                 return AVERROR(ENOMEM);

  1015.             ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);

  1016.             if (adts->pce_size) {

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

  1018.                 adts->pce_size = 0;

  1019.             }

  1020.             memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);

  1021.             buf = data;

  1022.             size = new_size;

  1023.         }

  1024.     }

  1025. 

  1026.     if (ts_st->payload_index && ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {

  1027.         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,

  1028.                          ts_st->payload_pts, ts_st->payload_dts,

  1029.                          ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1030.         ts_st->payload_index = 0;

  1031.     }

  1032. 

  1033.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > DEFAULT_PES_PAYLOAD_SIZE) {

  1034.         av_assert0(!ts_st->payload_index);

  1035.         // for video and subtitle, write a single pes packet

  1036.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1037.         av_free(data);

  1038.         return 0;

  1039.     }

  1040. 

  1041.     if (!ts_st->payload_index) {

  1042.         ts_st->payload_pts = pts;

  1043.         ts_st->payload_dts = dts;

  1044.         ts_st->payload_flags = pkt->flags;

  1045.     }

  1046. 

  1047.     memcpy(ts_st->payload + ts_st->payload_index, buf, size);

  1048.     ts_st->payload_index += size;

  1049. 

  1050.     av_free(data);

  1051. 

  1052.     return 0;

  1053. }

  1054. 

  1055. static int mpegts_write_end(AVFormatContext *s)

  1056. {

  1057.     MpegTSWrite *ts = s->priv_data;

  1058.     MpegTSWriteStream *ts_st;

  1059.     MpegTSService *service;

  1060.     AVStream *st;

  1061.     int i;

  1062. 

  1063.     /* flush current packets */

  1064.     for(i = 0; i < s->nb_streams; i++) {

  1065.         st = s->streams[i];

  1066.         ts_st = st->priv_data;

  1067.         if (ts_st->payload_index > 0) {

  1068.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,

  1069.                              ts_st->payload_pts, ts_st->payload_dts,

  1070.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1071.         }

  1072.         av_freep(&ts_st->adts);

  1073.     }

  1074.     avio_flush(s->pb);

  1075. 

  1076.     for(i = 0; i < ts->nb_services; i++) {

  1077.         service = ts->services[i];

  1078.         av_freep(&service->provider_name);

  1079.         av_freep(&service->name);

  1080.         av_free(service);

  1081.     }

  1082.     av_free(ts->services);

  1083. 

  1084.     return 0;

  1085. }

  1086. 

  1087. AVOutputFormat ff_mpegts_muxer = {

  1088.     .name              = "mpegts",

  1089.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1090.     .mime_type         = "video/x-mpegts",

  1091.     .extensions        = "ts,m2t,m2ts",

  1092.     .priv_data_size    = sizeof(MpegTSWrite),

  1093.     .audio_codec       = CODEC_ID_MP2,

  1094.     .video_codec       = CODEC_ID_MPEG2VIDEO,

  1095.     .write_header      = mpegts_write_header,

  1096.     .write_packet      = mpegts_write_packet,

  1097.     .write_trailer     = mpegts_write_end,

  1098.     .priv_class = &mpegts_muxer_class,

  1099. };