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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/opt.h"

  25. #include "libavcodec/mpegvideo.h"

  26. #include "avformat.h"

  27. #include "internal.h"

  28. #include "mpegts.h"

  29. #include "adts.h"

  30. 

  31. #define PCR_TIME_BASE 27000000

  32. 

  33. /* write DVB SI sections */

  34. 

  35. /*********************************************/

  36. /* mpegts section writer */

  37. 

  38. typedef struct MpegTSSection {

  39.     int pid;

  40.     int cc;

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

  42.     void *opaque;

  43. } MpegTSSection;

  44. 

  45. typedef struct MpegTSService {

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

  47.     int sid;           /* service ID */

  48.     char *name;

  49.     char *provider_name;

  50.     int pcr_pid;

  51.     int pcr_packet_count;

  52.     int pcr_packet_period;

  53. } MpegTSService;

  54. 

  55. typedef struct MpegTSWrite {

  56.     const AVClass *av_class;

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

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

  59.     MpegTSService **services;

  60.     int sdt_packet_count;

  61.     int sdt_packet_period;

  62.     int pat_packet_count;

  63.     int pat_packet_period;

  64.     int nb_services;

  65.     int onid;

  66.     int tsid;

  67.     int64_t first_pcr;

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

  69. 

  70.     int transport_stream_id;

  71.     int original_network_id;

  72.     int service_id;

  73. 

  74.     int pmt_start_pid;

  75.     int start_pid;

  76. } MpegTSWrite;

  77. 

  78. static const AVOption options[] = {

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

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

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

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

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

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

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

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

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

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

  89.     { NULL },

  90. };

  91. 

  92. static const AVClass mpegts_muxer_class = {

  93.     .class_name     = "MPEGTS muxer",

  94.     .item_name      = av_default_item_name,

  95.     .option         = options,

  96.     .version        = LIBAVUTIL_VERSION_INT,

  97. };

  98. 

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

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

  101. {

  102.     unsigned int crc;

  103.     unsigned char packet[TS_PACKET_SIZE];

  104.     const unsigned char *buf_ptr;

  105.     unsigned char *q;

  106.     int first, b, len1, left;

  107. 

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

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

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

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

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

  113. 

  114.     /* send each packet */

  115.     buf_ptr = buf;

  116.     while (len > 0) {

  117.         first = (buf == buf_ptr);

  118.         q = packet;

  119.         *q++ = 0x47;

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

  121.         if (first)

  122.             b |= 0x40;

  123.         *q++ = b;

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

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

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

  127.         if (first)

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

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

  130.         if (len1 > len)

  131.             len1 = len;

  132.         memcpy(q, buf_ptr, len1);

  133.         q += len1;

  134.         /* add known padding data */

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

  136.         if (left > 0)

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

  138. 

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

  140. 

  141.         buf_ptr += len1;

  142.         len -= len1;

  143.     }

  144. }

  145. 

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

  147. {

  148.     uint8_t *q;

  149.     q = *q_ptr;

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

  151.     *q++ = val;

  152.     *q_ptr = q;

  153. }

  154. 

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

  156.                           int version, int sec_num, int last_sec_num,

  157.                           uint8_t *buf, int len)

  158. {

  159.     uint8_t section[1024], *q;

  160.     unsigned int tot_len;

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

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

  163. 

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

  165.     /* check if not too big */

  166.     if (tot_len > 1024)

  167.         return -1;

  168. 

  169.     q = section;

  170.     *q++ = tid;

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

  172.     put16(&q, id);

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

  174.     *q++ = sec_num;

  175.     *q++ = last_sec_num;

  176.     memcpy(q, buf, len);

  177. 

  178.     mpegts_write_section(s, section, tot_len);

  179.     return 0;

  180. }

  181. 

  182. /*********************************************/

  183. /* mpegts writer */

  184. 

  185. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  186. #define DEFAULT_SERVICE_NAME    "Service01"

  187. 

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

  189. #define DEFAULT_PES_HEADER_FREQ 16

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

  191. 

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

  193. #define SDT_RETRANS_TIME 500

  194. #define PAT_RETRANS_TIME 100

  195. #define PCR_RETRANS_TIME 20

  196. 

  197. typedef struct MpegTSWriteStream {

  198.     struct MpegTSService *service;

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

  200.     int cc;

  201.     int payload_index;

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

  203.     int64_t payload_pts;

  204.     int64_t payload_dts;

  205.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  206.     ADTSContext *adts;

  207. } MpegTSWriteStream;

  208. 

  209. static void mpegts_write_pat(AVFormatContext *s)

  210. {

  211.     MpegTSWrite *ts = s->priv_data;

  212.     MpegTSService *service;

  213.     uint8_t data[1012], *q;

  214.     int i;

  215. 

  216.     q = data;

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

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

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

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

  221.     }

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

  223.                           data, q - data);

  224. }

  225. 

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

  227. {

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

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

  230.     int val, stream_type, i;

  231. 

  232.     q = data;

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

  234. 

  235.     program_info_length_ptr = q;

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

  237. 

  238.     /* put program info here */

  239. 

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

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

  242.     program_info_length_ptr[1] = val;

  243. 

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

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

  246.         MpegTSWriteStream *ts_st = st->priv_data;

  247.         AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);

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

  249.         case CODEC_ID_MPEG1VIDEO:

  250.         case CODEC_ID_MPEG2VIDEO:

  251.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  252.             break;

  253.         case CODEC_ID_MPEG4:

  254.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  255.             break;

  256.         case CODEC_ID_H264:

  257.             stream_type = STREAM_TYPE_VIDEO_H264;

  258.             break;

  259.         case CODEC_ID_DIRAC:

  260.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  261.             break;

  262.         case CODEC_ID_MP2:

  263.         case CODEC_ID_MP3:

  264.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  265.             break;

  266.         case CODEC_ID_AAC:

  267.             stream_type = STREAM_TYPE_AUDIO_AAC;

  268.             break;

  269.         case CODEC_ID_AAC_LATM:

  270.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  271.             break;

  272.         case CODEC_ID_AC3:

  273.             stream_type = STREAM_TYPE_AUDIO_AC3;

  274.             break;

  275.         default:

  276.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  277.             break;

  278.         }

  279.         *q++ = stream_type;

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

  281.         desc_length_ptr = q;

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

  283. 

  284.         /* write optional descriptors here */

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

  286.         case AVMEDIA_TYPE_AUDIO:

  287.             if (lang) {

  288.                 char *p;

  289.                 char *next = lang->value;

  290.                 uint8_t *len_ptr;

  291. 

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

  293.                 len_ptr = q++;

  294.                 *len_ptr = 0;

  295. 

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

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

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

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

  300. 

  301.                     *q++ = *p++;

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

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

  304. 

  305.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  306.                     *q++ = 0x01;

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

  308.                     *q++ = 0x02;

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

  310.                     *q++ = 0x03;

  311.                 else

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

  313. 

  314.                     *len_ptr += 4;

  315.                 }

  316. 

  317.                 if (*len_ptr == 0)

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

  319.             }

  320.             break;

  321.         case AVMEDIA_TYPE_SUBTITLE:

  322.             {

  323.                 const char *language;

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

  325.                 *q++ = 0x59;

  326.                 *q++ = 8;

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

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

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

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

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

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

  333.                     q += 4;

  334.                 } else {

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

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

  337.                 }

  338.             }

  339.             break;

  340.         case AVMEDIA_TYPE_VIDEO:

  341.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  343.                 *q++ = 4;

  344.                 *q++ = 'd';

  345.                 *q++ = 'r';

  346.                 *q++ = 'a';

  347.                 *q++ = 'c';

  348.             }

  349.             break;

  350.         }

  351. 

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

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

  354.         desc_length_ptr[1] = val;

  355.     }

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

  357.                           data, q - data);

  358. }

  359. 

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

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

  362. {

  363.     uint8_t *q;

  364.     int len;

  365. 

  366.     q = *q_ptr;

  367.     if (!str)

  368.         len = 0;

  369.     else

  370.         len = strlen(str);

  371.     *q++ = len;

  372.     memcpy(q, str, len);

  373.     q += len;

  374.     *q_ptr = q;

  375. }

  376. 

  377. static void mpegts_write_sdt(AVFormatContext *s)

  378. {

  379.     MpegTSWrite *ts = s->priv_data;

  380.     MpegTSService *service;

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

  382.     int i, running_status, free_ca_mode, val;

  383. 

  384.     q = data;

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

  386.     *q++ = 0xff;

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

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

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

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

  391.         desc_list_len_ptr = q;

  392.         q += 2;

  393.         running_status = 4; /* running */

  394.         free_ca_mode = 0;

  395. 

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

  397.         *q++ = 0x48;

  398.         desc_len_ptr = q;

  399.         q++;

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

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

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

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

  404. 

  405.         /* fill descriptor length */

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

  407.             (q - desc_list_len_ptr - 2);

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

  409.         desc_list_len_ptr[1] = val;

  410.     }

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

  412.                           data, q - data);

  413. }

  414. 

  415. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  416.                                          int sid,

  417.                                          const char *provider_name,

  418.                                          const char *name)

  419. {

  420.     MpegTSService *service;

  421. 

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

  423.     if (!service)

  424.         return NULL;

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

  426.     service->sid = sid;

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

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

  429.     service->pcr_pid = 0x1fff;

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

  431.     return service;

  432. }

  433. 

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

  435. {

  436.     AVFormatContext *ctx = s->opaque;

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

  438. }

  439. 

  440. static int mpegts_write_header(AVFormatContext *s)

  441. {

  442.     MpegTSWrite *ts = s->priv_data;

  443.     MpegTSWriteStream *ts_st;

  444.     MpegTSService *service;

  445.     AVStream *st, *pcr_st = NULL;

  446.     AVMetadataTag *title, *provider;

  447.     int i, j;

  448.     const char *service_name;

  449.     const char *provider_name;

  450.     int *pids;

  451. 

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

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

  454.     /* allocate a single DVB service */

  455.     title = av_metadata_get(s->metadata, "service_name", NULL, 0);

  456.     if (!title)

  457.         title = av_metadata_get(s->metadata, "title", NULL, 0);

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

  459.     provider = av_metadata_get(s->metadata, "service_provider", NULL, 0);

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

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

  462.     service->pmt.write_packet = section_write_packet;

  463.     service->pmt.opaque = s;

  464.     service->pmt.cc = 15;

  465. 

  466.     ts->pat.pid = PAT_PID;

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

  468.     ts->pat.write_packet = section_write_packet;

  469.     ts->pat.opaque = s;

  470. 

  471.     ts->sdt.pid = SDT_PID;

  472.     ts->sdt.cc = 15;

  473.     ts->sdt.write_packet = section_write_packet;

  474.     ts->sdt.opaque = s;

  475. 

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

  477.     if (!pids)

  478.         return AVERROR(ENOMEM);

  479. 

  480.     /* assign pids to each stream */

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

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

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

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

  485.         if (!ts_st)

  486.             goto fail;

  487.         st->priv_data = ts_st;

  488.         ts_st->service = service;

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

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

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

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

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

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

  495.         } else {

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

  497.             goto fail;

  498.         }

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

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

  501.             goto fail;

  502.         }

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

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

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

  506.                 goto fail;

  507.             }

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

  509.         ts_st->payload_pts = AV_NOPTS_VALUE;

  510.         ts_st->payload_dts = AV_NOPTS_VALUE;

  511.         ts_st->first_pts_check = 1;

  512.         ts_st->cc = 15;

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

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

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

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

  517.             pcr_st = st;

  518.         }

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

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

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

  522.             if (!ts_st->adts)

  523.                 return AVERROR(ENOMEM);

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

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

  526.                 return -1;

  527.         }

  528.     }

  529. 

  530.     av_free(pids);

  531. 

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

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

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

  535.         ts_st = pcr_st->priv_data;

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

  537.     }

  538. 

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

  540. 

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

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

  543.             (TS_PACKET_SIZE * 8 * 1000);

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

  545.             (TS_PACKET_SIZE * 8 * 1000);

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

  547.             (TS_PACKET_SIZE * 8 * 1000);

  548. 

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

  550.     } else {

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

  552.         ts->sdt_packet_period = 200;

  553.         ts->pat_packet_period = 40;

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

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

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

  557.                 service->pcr_packet_period =

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

  559.             } else {

  560.                 service->pcr_packet_period =

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

  562.             }

  563.         } else {

  564.             // max delta PCR 0.1s

  565.             service->pcr_packet_period =

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

  567.         }

  568.     }

  569. 

  570.     // output a PCR as soon as possible

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

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

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

  574. 

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

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

  577.     else

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

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

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

  581.            service->pcr_packet_period,

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

  583. 

  584.     avio_flush(s->pb);

  585. 

  586.     return 0;

  587. 

  588.  fail:

  589.     av_free(pids);

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

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

  592.         av_freep(&st->priv_data);

  593.     }

  594.     return -1;

  595. }

  596. 

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

  598. static void retransmit_si_info(AVFormatContext *s)

  599. {

  600.     MpegTSWrite *ts = s->priv_data;

  601.     int i;

  602. 

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

  604.         ts->sdt_packet_count = 0;

  605.         mpegts_write_sdt(s);

  606.     }

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

  608.         ts->pat_packet_count = 0;

  609.         mpegts_write_pat(s);

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

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

  612.         }

  613.     }

  614. }

  615. 

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

  617. {

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

  619.            ts->first_pcr;

  620. }

  621. 

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

  623. {

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

  625. 

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

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

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

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

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

  631.     *buf++ = pcr_low;

  632. 

  633.     return buf;

  634. }

  635. 

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

  637. static void mpegts_insert_null_packet(AVFormatContext *s)

  638. {

  639.     uint8_t *q;

  640.     uint8_t buf[TS_PACKET_SIZE];

  641. 

  642.     q = buf;

  643.     *q++ = 0x47;

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

  645.     *q++ = 0xff;

  646.     *q++ = 0x10;

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

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

  649. }

  650. 

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

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

  653. {

  654.     MpegTSWrite *ts = s->priv_data;

  655.     MpegTSWriteStream *ts_st = st->priv_data;

  656.     uint8_t *q;

  657.     uint8_t buf[TS_PACKET_SIZE];

  658. 

  659.     q = buf;

  660.     *q++ = 0x47;

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

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

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

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

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

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

  667. 

  668.     /* PCR coded into 6 bytes */

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

  670. 

  671.     /* stuffing bytes */

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

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

  674. }

  675. 

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

  677. {

  678.     int val;

  679. 

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

  681.     *q++ = val;

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

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

  684.     *q++ = val;

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

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

  687.     *q++ = val;

  688. }

  689. 

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

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

  692.  * to exactly fill the last ts packet.

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

  694.  */

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

  696.                              const uint8_t *payload, int payload_size,

  697.                              int64_t pts, int64_t dts)

  698. {

  699.     MpegTSWriteStream *ts_st = st->priv_data;

  700.     MpegTSWrite *ts = s->priv_data;

  701.     uint8_t buf[TS_PACKET_SIZE];

  702.     uint8_t *q;

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

  704.     int afc_len, stuffing_len;

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

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

  707. 

  708.     is_start = 1;

  709.     while (payload_size > 0) {

  710.         retransmit_si_info(s);

  711. 

  712.         write_pcr = 0;

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

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

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

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

  717.                 ts_st->service->pcr_packet_period) {

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

  719.                 write_pcr = 1;

  720.             }

  721.         }

  722. 

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

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

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

  726.             if (write_pcr)

  727.                 mpegts_insert_pcr_only(s, st);

  728.             else

  729.                 mpegts_insert_null_packet(s);

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

  731.         }

  732. 

  733.         /* prepare packet header */

  734.         q = buf;

  735.         *q++ = 0x47;

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

  737.         if (is_start)

  738.             val |= 0x40;

  739.         *q++ = val;

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

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

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

  743.         if (write_pcr) {

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

  745.             if (ts->mux_rate > 1)

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

  747.             else

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

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

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

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

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

  753.             q = write_pcr_bits(q, pcr);

  754.         }

  755.         if (is_start) {

  756.             int pes_extension = 0;

  757.             /* write PES header */

  758.             *q++ = 0x00;

  759.             *q++ = 0x00;

  760.             *q++ = 0x01;

  761.             private_code = 0;

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

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

  764.                     *q++ = 0xfd;

  765.                 } else

  766.                     *q++ = 0xe0;

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

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

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

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

  771.                 *q++ = 0xc0;

  772.             } else {

  773.                 *q++ = 0xbd;

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

  775.                     private_code = 0x20;

  776.                 }

  777.             }

  778.             header_len = 0;

  779.             flags = 0;

  780.             if (pts != AV_NOPTS_VALUE) {

  781.                 header_len += 5;

  782.                 flags |= 0x80;

  783.             }

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

  785.                 header_len += 5;

  786.                 flags |= 0x40;

  787.             }

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

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

  790.                 /* set PES_extension_flag */

  791.                 pes_extension = 1;

  792.                 flags |= 0x01;

  793. 

  794.                 /*

  795.                 * One byte for PES2 extension flag +

  796.                 * one byte for extension length +

  797.                 * one byte for extension id

  798.                 */

  799.                 header_len += 3;

  800.             }

  801.             len = payload_size + header_len + 3;

  802.             if (private_code != 0)

  803.                 len++;

  804.             if (len > 0xffff)

  805.                 len = 0;

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

  807.             *q++ = len;

  808.             val = 0x80;

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

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

  811.                 val |= 0x04;

  812.             *q++ = val;

  813.             *q++ = flags;

  814.             *q++ = header_len;

  815.             if (pts != AV_NOPTS_VALUE) {

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

  817.                 q += 5;

  818.             }

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

  820.                 write_pts(q, 1, dts);

  821.                 q += 5;

  822.             }

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

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

  825.                 *q++ = flags;

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

  827.                 /*

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

  829.                 * write the extended stream id

  830.                 */

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

  832.             }

  833.             if (private_code != 0)

  834.                 *q++ = private_code;

  835.             is_start = 0;

  836.         }

  837.         /* header size */

  838.         header_len = q - buf;

  839.         /* data len */

  840.         len = TS_PACKET_SIZE - header_len;

  841.         if (len > payload_size)

  842.             len = payload_size;

  843.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  844.         if (stuffing_len > 0) {

  845.             /* add stuffing with AFC */

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

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

  848.                 afc_len = buf[4] + 1;

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

  850.                         buf + 4 + afc_len,

  851.                         header_len - (4 + afc_len));

  852.                 buf[4] += stuffing_len;

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

  854.             } else {

  855.                 /* add stuffing */

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

  857.                 buf[3] |= 0x20;

  858.                 buf[4] = stuffing_len - 1;

  859.                 if (stuffing_len >= 2) {

  860.                     buf[5] = 0x00;

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

  862.                 }

  863.             }

  864.         }

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

  866.         payload += len;

  867.         payload_size -= len;

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

  869.     }

  870.     avio_flush(s->pb);

  871. }

  872. 

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

  874. {

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

  876.     int size = pkt->size;

  877.     uint8_t *buf= pkt->data;

  878.     uint8_t *data= NULL;

  879.     MpegTSWriteStream *ts_st = st->priv_data;

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

  881.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  882. 

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

  884.         pts = pkt->pts + delay;

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

  886.         dts = pkt->dts + delay;

  887. 

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

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

  890.         return -1;

  891.     }

  892.     ts_st->first_pts_check = 0;

  893. 

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

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

  896.         uint32_t state = -1;

  897. 

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

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

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

  901.             return -1;

  902.         }

  903. 

  904.         do {

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

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

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

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

  909. 

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

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

  912.             if (!data)

  913.                 return -1;

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

  915.             AV_WB32(data, 0x00000001);

  916.             data[4] = 0x09;

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

  918.             buf  = data;

  919.             size = pkt->size+6;

  920.         }

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

  922.         if (pkt->size < 2)

  923.             return -1;

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

  925.             ADTSContext *adts = ts_st->adts;

  926.             int new_size;

  927.             if (!adts) {

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

  929.                        "and extradata missing\n");

  930.                 return -1;

  931.             }

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

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

  934.                 return -1;

  935.             data = av_malloc(new_size);

  936.             if (!data)

  937.                 return AVERROR(ENOMEM);

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

  939.             if (adts->pce_size) {

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

  941.                 adts->pce_size = 0;

  942.             }

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

  944.             buf = data;

  945.             size = new_size;

  946.         }

  947.     }

  948. 

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

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

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

  952.         av_free(data);

  953.         return 0;

  954.     }

  955. 

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

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

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

  959.         ts_st->payload_index = 0;

  960.     }

  961. 

  962.     if (!ts_st->payload_index) {

  963.         ts_st->payload_pts = pts;

  964.         ts_st->payload_dts = dts;

  965.     }

  966. 

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

  968.     ts_st->payload_index += size;

  969. 

  970.     av_free(data);

  971. 

  972.     return 0;

  973. }

  974. 

  975. static int mpegts_write_end(AVFormatContext *s)

  976. {

  977.     MpegTSWrite *ts = s->priv_data;

  978.     MpegTSWriteStream *ts_st;

  979.     MpegTSService *service;

  980.     AVStream *st;

  981.     int i;

  982. 

  983.     /* flush current packets */

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

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

  986.         ts_st = st->priv_data;

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

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

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

  990.         }

  991.         av_freep(&ts_st->adts);

  992.     }

  993.     avio_flush(s->pb);

  994. 

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

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

  997.         av_freep(&service->provider_name);

  998.         av_freep(&service->name);

  999.         av_free(service);

  1000.     }

  1001.     av_free(ts->services);

  1002. 

  1003.     return 0;

  1004. }

  1005. 

  1006. AVOutputFormat ff_mpegts_muxer = {

  1007.     "mpegts",

  1008.     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1009.     "video/x-mpegts",

  1010.     "ts,m2t",

  1011.     sizeof(MpegTSWrite),

  1012.     CODEC_ID_MP2,

  1013.     CODEC_ID_MPEG2VIDEO,

  1014.     mpegts_write_header,

  1015.     mpegts_write_packet,

  1016.     mpegts_write_end,

  1017.     .priv_class = &mpegts_muxer_class,

  1018. };