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

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

  58.     MpegTSService **services;

  59.     int sdt_packet_count;

  60.     int sdt_packet_period;

  61.     int pat_packet_count;

  62.     int pat_packet_period;

  63.     int nb_services;

  64.     int onid;

  65.     int tsid;

  66.     int64_t first_pcr;

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

  68. 

  69.     int transport_stream_id;

  70.     int original_network_id;

  71.     int service_id;

  72. 

  73.     int pmt_start_pid;

  74.     int start_pid;

  75. } MpegTSWrite;

  76. 

  77. static const AVOption options[] = {

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

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

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

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

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

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

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

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

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

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

  88.     { NULL },

  89. };

  90. 

  91. static const AVClass mpegts_muxer_class = {

  92.     "MPEGTS muxer",

  93.     av_default_item_name,

  94.     options,

  95.     LIBAVUTIL_VERSION_INT,

  96. };

  97. 

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

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

  100. {

  101.     unsigned int crc;

  102.     unsigned char packet[TS_PACKET_SIZE];

  103.     const unsigned char *buf_ptr;

  104.     unsigned char *q;

  105.     int first, b, len1, left;

  106. 

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

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

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

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

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

  112. 

  113.     /* send each packet */

  114.     buf_ptr = buf;

  115.     while (len > 0) {

  116.         first = (buf == buf_ptr);

  117.         q = packet;

  118.         *q++ = 0x47;

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

  120.         if (first)

  121.             b |= 0x40;

  122.         *q++ = b;

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

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

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

  126.         if (first)

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

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

  129.         if (len1 > len)

  130.             len1 = len;

  131.         memcpy(q, buf_ptr, len1);

  132.         q += len1;

  133.         /* add known padding data */

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

  135.         if (left > 0)

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

  137. 

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

  139. 

  140.         buf_ptr += len1;

  141.         len -= len1;

  142.     }

  143. }

  144. 

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

  146. {

  147.     uint8_t *q;

  148.     q = *q_ptr;

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

  150.     *q++ = val;

  151.     *q_ptr = q;

  152. }

  153. 

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

  155.                           int version, int sec_num, int last_sec_num,

  156.                           uint8_t *buf, int len)

  157. {

  158.     uint8_t section[1024], *q;

  159.     unsigned int tot_len;

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

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

  162. 

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

  164.     /* check if not too big */

  165.     if (tot_len > 1024)

  166.         return -1;

  167. 

  168.     q = section;

  169.     *q++ = tid;

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

  171.     put16(&q, id);

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

  173.     *q++ = sec_num;

  174.     *q++ = last_sec_num;

  175.     memcpy(q, buf, len);

  176. 

  177.     mpegts_write_section(s, section, tot_len);

  178.     return 0;

  179. }

  180. 

  181. /*********************************************/

  182. /* mpegts writer */

  183. 

  184. #define DEFAULT_PROVIDER_NAME   "Libav"

  185. #define DEFAULT_SERVICE_NAME    "Service01"

  186. 

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

  188. #define DEFAULT_PES_HEADER_FREQ 16

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

  190. 

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

  192. #define SDT_RETRANS_TIME 500

  193. #define PAT_RETRANS_TIME 100

  194. #define PCR_RETRANS_TIME 20

  195. 

  196. typedef struct MpegTSWriteStream {

  197.     struct MpegTSService *service;

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

  199.     int cc;

  200.     int payload_index;

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

  202.     int64_t payload_pts;

  203.     int64_t payload_dts;

  204.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  205.     ADTSContext *adts;

  206. } MpegTSWriteStream;

  207. 

  208. static void mpegts_write_pat(AVFormatContext *s)

  209. {

  210.     MpegTSWrite *ts = s->priv_data;

  211.     MpegTSService *service;

  212.     uint8_t data[1012], *q;

  213.     int i;

  214. 

  215.     q = data;

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

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

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

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

  220.     }

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

  222.                           data, q - data);

  223. }

  224. 

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

  226. {

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

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

  229.     int val, stream_type, i;

  230. 

  231.     q = data;

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

  233. 

  234.     program_info_length_ptr = q;

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

  236. 

  237.     /* put program info here */

  238. 

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

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

  241.     program_info_length_ptr[1] = val;

  242. 

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

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

  245.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  248.         case CODEC_ID_MPEG1VIDEO:

  249.         case CODEC_ID_MPEG2VIDEO:

  250.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  251.             break;

  252.         case CODEC_ID_MPEG4:

  253.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  254.             break;

  255.         case CODEC_ID_H264:

  256.             stream_type = STREAM_TYPE_VIDEO_H264;

  257.             break;

  258.         case CODEC_ID_DIRAC:

  259.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  260.             break;

  261.         case CODEC_ID_MP2:

  262.         case CODEC_ID_MP3:

  263.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  264.             break;

  265.         case CODEC_ID_AAC:

  266.             stream_type = STREAM_TYPE_AUDIO_AAC;

  267.             break;

  268.         case CODEC_ID_AAC_LATM:

  269.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  270.             break;

  271.         case CODEC_ID_AC3:

  272.             stream_type = STREAM_TYPE_AUDIO_AC3;

  273.             break;

  274.         default:

  275.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  276.             break;

  277.         }

  278.         *q++ = stream_type;

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

  280.         desc_length_ptr = q;

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

  282. 

  283.         /* write optional descriptors here */

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

  285.         case AVMEDIA_TYPE_AUDIO:

  286.             if (lang) {

  287.                 char *p;

  288.                 char *next = lang->value;

  289.                 uint8_t *len_ptr;

  290. 

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

  292.                 len_ptr = q++;

  293.                 *len_ptr = 0;

  294. 

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

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

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

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

  299. 

  300.                     *q++ = *p++;

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

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

  303. 

  304.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  305.                     *q++ = 0x01;

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

  307.                     *q++ = 0x02;

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

  309.                     *q++ = 0x03;

  310.                 else

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

  312. 

  313.                     *len_ptr += 4;

  314.                 }

  315. 

  316.                 if (*len_ptr == 0)

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

  318.             }

  319.             break;

  320.         case AVMEDIA_TYPE_SUBTITLE:

  321.             {

  322.                 const char *language;

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

  324.                 *q++ = 0x59;

  325.                 *q++ = 8;

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

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

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

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

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

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

  332.                     q += 4;

  333.                 } else {

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

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

  336.                 }

  337.             }

  338.             break;

  339.         case AVMEDIA_TYPE_VIDEO:

  340.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  342.                 *q++ = 4;

  343.                 *q++ = 'd';

  344.                 *q++ = 'r';

  345.                 *q++ = 'a';

  346.                 *q++ = 'c';

  347.             }

  348.             break;

  349.         }

  350. 

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

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

  353.         desc_length_ptr[1] = val;

  354.     }

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

  356.                           data, q - data);

  357. }

  358. 

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

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

  361. {

  362.     uint8_t *q;

  363.     int len;

  364. 

  365.     q = *q_ptr;

  366.     if (!str)

  367.         len = 0;

  368.     else

  369.         len = strlen(str);

  370.     *q++ = len;

  371.     memcpy(q, str, len);

  372.     q += len;

  373.     *q_ptr = q;

  374. }

  375. 

  376. static void mpegts_write_sdt(AVFormatContext *s)

  377. {

  378.     MpegTSWrite *ts = s->priv_data;

  379.     MpegTSService *service;

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

  381.     int i, running_status, free_ca_mode, val;

  382. 

  383.     q = data;

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

  385.     *q++ = 0xff;

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

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

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

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

  390.         desc_list_len_ptr = q;

  391.         q += 2;

  392.         running_status = 4; /* running */

  393.         free_ca_mode = 0;

  394. 

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

  396.         *q++ = 0x48;

  397.         desc_len_ptr = q;

  398.         q++;

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

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

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

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

  403. 

  404.         /* fill descriptor length */

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

  406.             (q - desc_list_len_ptr - 2);

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

  408.         desc_list_len_ptr[1] = val;

  409.     }

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

  411.                           data, q - data);

  412. }

  413. 

  414. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  415.                                          int sid,

  416.                                          const char *provider_name,

  417.                                          const char *name)

  418. {

  419.     MpegTSService *service;

  420. 

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

  422.     if (!service)

  423.         return NULL;

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

  425.     service->sid = sid;

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

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

  428.     service->pcr_pid = 0x1fff;

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

  430.     return service;

  431. }

  432. 

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

  434. {

  435.     AVFormatContext *ctx = s->opaque;

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

  437. }

  438. 

  439. static int mpegts_write_header(AVFormatContext *s)

  440. {

  441.     MpegTSWrite *ts = s->priv_data;

  442.     MpegTSWriteStream *ts_st;

  443.     MpegTSService *service;

  444.     AVStream *st, *pcr_st = NULL;

  445.     AVMetadataTag *title, *provider;

  446.     int i, j;

  447.     const char *service_name;

  448.     const char *provider_name;

  449.     int *pids;

  450. 

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

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

  453.     /* allocate a single DVB service */

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

  455.     if (!title)

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

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

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

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

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

  461.     service->pmt.write_packet = section_write_packet;

  462.     service->pmt.opaque = s;

  463.     service->pmt.cc = 15;

  464. 

  465.     ts->pat.pid = PAT_PID;

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

  467.     ts->pat.write_packet = section_write_packet;

  468.     ts->pat.opaque = s;

  469. 

  470.     ts->sdt.pid = SDT_PID;

  471.     ts->sdt.cc = 15;

  472.     ts->sdt.write_packet = section_write_packet;

  473.     ts->sdt.opaque = s;

  474. 

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

  476.     if (!pids)

  477.         return AVERROR(ENOMEM);

  478. 

  479.     /* assign pids to each stream */

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

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

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

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

  484.         if (!ts_st)

  485.             goto fail;

  486.         st->priv_data = ts_st;

  487.         ts_st->service = service;

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

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

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

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

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

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

  494.         } else {

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

  496.             goto fail;

  497.         }

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

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

  500.             goto fail;

  501.         }

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

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

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

  505.                 goto fail;

  506.             }

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

  508.         ts_st->payload_pts = AV_NOPTS_VALUE;

  509.         ts_st->payload_dts = AV_NOPTS_VALUE;

  510.         ts_st->first_pts_check = 1;

  511.         ts_st->cc = 15;

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

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

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

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

  516.             pcr_st = st;

  517.         }

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

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

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

  521.             if (!ts_st->adts)

  522.                 return AVERROR(ENOMEM);

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

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

  525.                 return -1;

  526.         }

  527.     }

  528. 

  529.     av_free(pids);

  530. 

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

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

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

  534.         ts_st = pcr_st->priv_data;

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

  536.     }

  537. 

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

  539. 

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

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

  542.             (TS_PACKET_SIZE * 8 * 1000);

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

  544.             (TS_PACKET_SIZE * 8 * 1000);

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

  546.             (TS_PACKET_SIZE * 8 * 1000);

  547. 

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

  549.     } else {

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

  551.         ts->sdt_packet_period = 200;

  552.         ts->pat_packet_period = 40;

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

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

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

  556.                 service->pcr_packet_period =

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

  558.             } else {

  559.                 service->pcr_packet_period =

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

  561.             }

  562.         } else {

  563.             // max delta PCR 0.1s

  564.             service->pcr_packet_period =

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

  566.         }

  567.     }

  568. 

  569.     // output a PCR as soon as possible

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

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

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

  573. 

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

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

  576.     else

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

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

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

  580.            service->pcr_packet_period,

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

  582. 

  583.     avio_flush(s->pb);

  584. 

  585.     return 0;

  586. 

  587.  fail:

  588.     av_free(pids);

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

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

  591.         av_freep(&st->priv_data);

  592.     }

  593.     return -1;

  594. }

  595. 

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

  597. static void retransmit_si_info(AVFormatContext *s)

  598. {

  599.     MpegTSWrite *ts = s->priv_data;

  600.     int i;

  601. 

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

  603.         ts->sdt_packet_count = 0;

  604.         mpegts_write_sdt(s);

  605.     }

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

  607.         ts->pat_packet_count = 0;

  608.         mpegts_write_pat(s);

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

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

  611.         }

  612.     }

  613. }

  614. 

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

  616. {

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

  618.            ts->first_pcr;

  619. }

  620. 

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

  622. {

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

  624. 

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

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

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

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

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

  630.     *buf++ = pcr_low;

  631. 

  632.     return buf;

  633. }

  634. 

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

  636. static void mpegts_insert_null_packet(AVFormatContext *s)

  637. {

  638.     uint8_t *q;

  639.     uint8_t buf[TS_PACKET_SIZE];

  640. 

  641.     q = buf;

  642.     *q++ = 0x47;

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

  644.     *q++ = 0xff;

  645.     *q++ = 0x10;

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

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

  648. }

  649. 

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

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

  652. {

  653.     MpegTSWrite *ts = s->priv_data;

  654.     MpegTSWriteStream *ts_st = st->priv_data;

  655.     uint8_t *q;

  656.     uint8_t buf[TS_PACKET_SIZE];

  657. 

  658.     q = buf;

  659.     *q++ = 0x47;

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

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

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

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

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

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

  666. 

  667.     /* PCR coded into 6 bytes */

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

  669. 

  670.     /* stuffing bytes */

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

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

  673. }

  674. 

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

  676. {

  677.     int val;

  678. 

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

  680.     *q++ = val;

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

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

  683.     *q++ = val;

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

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

  686.     *q++ = val;

  687. }

  688. 

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

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

  691.  * to exactly fill the last ts packet.

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

  693.  */

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

  695.                              const uint8_t *payload, int payload_size,

  696.                              int64_t pts, int64_t dts)

  697. {

  698.     MpegTSWriteStream *ts_st = st->priv_data;

  699.     MpegTSWrite *ts = s->priv_data;

  700.     uint8_t buf[TS_PACKET_SIZE];

  701.     uint8_t *q;

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

  703.     int afc_len, stuffing_len;

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

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

  706. 

  707.     is_start = 1;

  708.     while (payload_size > 0) {

  709.         retransmit_si_info(s);

  710. 

  711.         write_pcr = 0;

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

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

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

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

  716.                 ts_st->service->pcr_packet_period) {

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

  718.                 write_pcr = 1;

  719.             }

  720.         }

  721. 

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

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

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

  725.             if (write_pcr)

  726.                 mpegts_insert_pcr_only(s, st);

  727.             else

  728.                 mpegts_insert_null_packet(s);

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

  730.         }

  731. 

  732.         /* prepare packet header */

  733.         q = buf;

  734.         *q++ = 0x47;

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

  736.         if (is_start)

  737.             val |= 0x40;

  738.         *q++ = val;

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

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

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

  742.         if (write_pcr) {

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

  744.             if (ts->mux_rate > 1)

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

  746.             else

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

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

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

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

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

  752.             q = write_pcr_bits(q, pcr);

  753.         }

  754.         if (is_start) {

  755.             int pes_extension = 0;

  756.             /* write PES header */

  757.             *q++ = 0x00;

  758.             *q++ = 0x00;

  759.             *q++ = 0x01;

  760.             private_code = 0;

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

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

  763.                     *q++ = 0xfd;

  764.                 } else

  765.                     *q++ = 0xe0;

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

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

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

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

  770.                 *q++ = 0xc0;

  771.             } else {

  772.                 *q++ = 0xbd;

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

  774.                     private_code = 0x20;

  775.                 }

  776.             }

  777.             header_len = 0;

  778.             flags = 0;

  779.             if (pts != AV_NOPTS_VALUE) {

  780.                 header_len += 5;

  781.                 flags |= 0x80;

  782.             }

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

  784.                 header_len += 5;

  785.                 flags |= 0x40;

  786.             }

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

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

  789.                 /* set PES_extension_flag */

  790.                 pes_extension = 1;

  791.                 flags |= 0x01;

  792. 

  793.                 /*

  794.                 * One byte for PES2 extension flag +

  795.                 * one byte for extension length +

  796.                 * one byte for extension id

  797.                 */

  798.                 header_len += 3;

  799.             }

  800.             len = payload_size + header_len + 3;

  801.             if (private_code != 0)

  802.                 len++;

  803.             if (len > 0xffff)

  804.                 len = 0;

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

  806.             *q++ = len;

  807.             val = 0x80;

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

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

  810.                 val |= 0x04;

  811.             *q++ = val;

  812.             *q++ = flags;

  813.             *q++ = header_len;

  814.             if (pts != AV_NOPTS_VALUE) {

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

  816.                 q += 5;

  817.             }

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

  819.                 write_pts(q, 1, dts);

  820.                 q += 5;

  821.             }

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

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

  824.                 *q++ = flags;

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

  826.                 /*

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

  828.                 * write the extended stream id

  829.                 */

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

  831.             }

  832.             if (private_code != 0)

  833.                 *q++ = private_code;

  834.             is_start = 0;

  835.         }

  836.         /* header size */

  837.         header_len = q - buf;

  838.         /* data len */

  839.         len = TS_PACKET_SIZE - header_len;

  840.         if (len > payload_size)

  841.             len = payload_size;

  842.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  843.         if (stuffing_len > 0) {

  844.             /* add stuffing with AFC */

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

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

  847.                 afc_len = buf[4] + 1;

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

  849.                         buf + 4 + afc_len,

  850.                         header_len - (4 + afc_len));

  851.                 buf[4] += stuffing_len;

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

  853.             } else {

  854.                 /* add stuffing */

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

  856.                 buf[3] |= 0x20;

  857.                 buf[4] = stuffing_len - 1;

  858.                 if (stuffing_len >= 2) {

  859.                     buf[5] = 0x00;

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

  861.                 }

  862.             }

  863.         }

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

  865.         payload += len;

  866.         payload_size -= len;

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

  868.     }

  869.     avio_flush(s->pb);

  870. }

  871. 

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

  873. {

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

  875.     int size = pkt->size;

  876.     uint8_t *buf= pkt->data;

  877.     uint8_t *data= NULL;

  878.     MpegTSWriteStream *ts_st = st->priv_data;

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

  880.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  881. 

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

  883.         pts = pkt->pts + delay;

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

  885.         dts = pkt->dts + delay;

  886. 

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

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

  889.         return -1;

  890.     }

  891.     ts_st->first_pts_check = 0;

  892. 

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

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

  895.         uint32_t state = -1;

  896. 

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

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

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

  900.             return -1;

  901.         }

  902. 

  903.         do {

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

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

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

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

  908. 

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

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

  911.             if (!data)

  912.                 return -1;

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

  914.             AV_WB32(data, 0x00000001);

  915.             data[4] = 0x09;

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

  917.             buf  = data;

  918.             size = pkt->size+6;

  919.         }

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

  921.         if (pkt->size < 2)

  922.             return -1;

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

  924.             ADTSContext *adts = ts_st->adts;

  925.             int new_size;

  926.             if (!adts) {

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

  928.                        "and extradata missing\n");

  929.                 return -1;

  930.             }

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

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

  933.                 return -1;

  934.             data = av_malloc(new_size);

  935.             if (!data)

  936.                 return AVERROR(ENOMEM);

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

  938.             if (adts->pce_size) {

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

  940.                 adts->pce_size = 0;

  941.             }

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

  943.             buf = data;

  944.             size = new_size;

  945.         }

  946.     }

  947. 

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

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

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

  951.         av_free(data);

  952.         return 0;

  953.     }

  954. 

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

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

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

  958.         ts_st->payload_index = 0;

  959.     }

  960. 

  961.     if (!ts_st->payload_index) {

  962.         ts_st->payload_pts = pts;

  963.         ts_st->payload_dts = dts;

  964.     }

  965. 

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

  967.     ts_st->payload_index += size;

  968. 

  969.     av_free(data);

  970. 

  971.     return 0;

  972. }

  973. 

  974. static int mpegts_write_end(AVFormatContext *s)

  975. {

  976.     MpegTSWrite *ts = s->priv_data;

  977.     MpegTSWriteStream *ts_st;

  978.     MpegTSService *service;

  979.     AVStream *st;

  980.     int i;

  981. 

  982.     /* flush current packets */

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

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

  985.         ts_st = st->priv_data;

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

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

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

  989.         }

  990.         av_freep(&ts_st->adts);

  991.     }

  992.     avio_flush(s->pb);

  993. 

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

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

  996.         av_freep(&service->provider_name);

  997.         av_freep(&service->name);

  998.         av_free(service);

  999.     }

  1000.     av_free(ts->services);

  1001. 

  1002.     return 0;

  1003. }

  1004. 

  1005. AVOutputFormat ff_mpegts_muxer = {

  1006.     "mpegts",

  1007.     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1008.     "video/x-mpegts",

  1009.     "ts,m2t",

  1010.     sizeof(MpegTSWrite),

  1011.     CODEC_ID_MP2,

  1012.     CODEC_ID_MPEG2VIDEO,

  1013.     mpegts_write_header,

  1014.     mpegts_write_packet,

  1015.     mpegts_write_end,

  1016.     .priv_class = &mpegts_muxer_class,

  1017. };