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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 "libavcodec/mpegvideo.h"

  25. #include "avformat.h"

  26. #include "mpegts.h"

  27. #include "adts.h"

  28. 

  29. /* write DVB SI sections */

  30. 

  31. /*********************************************/

  32. /* mpegts section writer */

  33. 

  34. typedef struct MpegTSSection {

  35.     int pid;

  36.     int cc;

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

  38.     void *opaque;

  39. } MpegTSSection;

  40. 

  41. typedef struct MpegTSService {

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

  43.     int sid;           /* service ID */

  44.     char *name;

  45.     char *provider_name;

  46.     int pcr_pid;

  47.     int pcr_packet_count;

  48.     int pcr_packet_period;

  49. } MpegTSService;

  50. 

  51. typedef struct MpegTSWrite {

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

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

  54.     MpegTSService **services;

  55.     int sdt_packet_count;

  56.     int sdt_packet_period;

  57.     int pat_packet_count;

  58.     int pat_packet_period;

  59.     int nb_services;

  60.     int onid;

  61.     int tsid;

  62.     uint64_t cur_pcr;

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

  64. } MpegTSWrite;

  65. 

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

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

  68. {

  69.     MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data;

  70.     unsigned int crc;

  71.     unsigned char packet[TS_PACKET_SIZE];

  72.     const unsigned char *buf_ptr;

  73.     unsigned char *q;

  74.     int first, b, len1, left;

  75. 

  76.     crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));

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

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

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

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

  81. 

  82.     /* send each packet */

  83.     buf_ptr = buf;

  84.     while (len > 0) {

  85.         first = (buf == buf_ptr);

  86.         q = packet;

  87.         *q++ = 0x47;

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

  89.         if (first)

  90.             b |= 0x40;

  91.         *q++ = b;

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

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

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

  95.         if (first)

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

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

  98.         if (len1 > len)

  99.             len1 = len;

  100.         memcpy(q, buf_ptr, len1);

  101.         q += len1;

  102.         /* add known padding data */

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

  104.         if (left > 0)

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

  106. 

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

  108. 

  109.         buf_ptr += len1;

  110.         len -= len1;

  111. 

  112.         ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;

  113.     }

  114. }

  115. 

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

  117. {

  118.     uint8_t *q;

  119.     q = *q_ptr;

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

  121.     *q++ = val;

  122.     *q_ptr = q;

  123. }

  124. 

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

  126.                           int version, int sec_num, int last_sec_num,

  127.                           uint8_t *buf, int len)

  128. {

  129.     uint8_t section[1024], *q;

  130.     unsigned int tot_len;

  131. 

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

  133.     /* check if not too big */

  134.     if (tot_len > 1024)

  135.         return -1;

  136. 

  137.     q = section;

  138.     *q++ = tid;

  139.     put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */

  140.     put16(&q, id);

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

  142.     *q++ = sec_num;

  143.     *q++ = last_sec_num;

  144.     memcpy(q, buf, len);

  145. 

  146.     mpegts_write_section(s, section, tot_len);

  147.     return 0;

  148. }

  149. 

  150. /*********************************************/

  151. /* mpegts writer */

  152. 

  153. #define DEFAULT_PMT_START_PID   0x1000

  154. #define DEFAULT_START_PID       0x0100

  155. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  156. #define DEFAULT_SERVICE_NAME    "Service01"

  157. 

  158. /* default network id, transport stream and service identifiers */

  159. #define DEFAULT_ONID            0x0001

  160. #define DEFAULT_TSID            0x0001

  161. #define DEFAULT_SID             0x0001

  162. 

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

  164. #define DEFAULT_PES_HEADER_FREQ 16

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

  166. 

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

  168. #define SDT_RETRANS_TIME 500

  169. #define PAT_RETRANS_TIME 100

  170. #define PCR_RETRANS_TIME 20

  171. 

  172. typedef struct MpegTSWriteStream {

  173.     struct MpegTSService *service;

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

  175.     int cc;

  176.     int payload_index;

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

  178.     int64_t payload_pts;

  179.     int64_t payload_dts;

  180.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  181.     ADTSContext *adts;

  182. } MpegTSWriteStream;

  183. 

  184. static void mpegts_write_pat(AVFormatContext *s)

  185. {

  186.     MpegTSWrite *ts = s->priv_data;

  187.     MpegTSService *service;

  188.     uint8_t data[1012], *q;

  189.     int i;

  190. 

  191.     q = data;

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

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

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

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

  196.     }

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

  198.                           data, q - data);

  199. }

  200. 

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

  202. {

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

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

  205.     int val, stream_type, i;

  206. 

  207.     q = data;

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

  209. 

  210.     program_info_length_ptr = q;

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

  212. 

  213.     /* put program info here */

  214. 

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

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

  217.     program_info_length_ptr[1] = val;

  218. 

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

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

  221.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  224.         case CODEC_ID_MPEG1VIDEO:

  225.         case CODEC_ID_MPEG2VIDEO:

  226.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  227.             break;

  228.         case CODEC_ID_MPEG4:

  229.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  230.             break;

  231.         case CODEC_ID_H264:

  232.             stream_type = STREAM_TYPE_VIDEO_H264;

  233.             break;

  234.         case CODEC_ID_DIRAC:

  235.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  236.             break;

  237.         case CODEC_ID_MP2:

  238.         case CODEC_ID_MP3:

  239.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  240.             break;

  241.         case CODEC_ID_AAC:

  242.             stream_type = STREAM_TYPE_AUDIO_AAC;

  243.             break;

  244.         case CODEC_ID_AC3:

  245.             stream_type = STREAM_TYPE_AUDIO_AC3;

  246.             break;

  247.         default:

  248.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  249.             break;

  250.         }

  251.         *q++ = stream_type;

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

  253.         desc_length_ptr = q;

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

  255. 

  256.         /* write optional descriptors here */

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

  258.         case CODEC_TYPE_AUDIO:

  259.             if (lang && strlen(lang->value) == 3) {

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

  261.                 *q++ = 4;

  262.                 *q++ = lang->value[0];

  263.                 *q++ = lang->value[1];

  264.                 *q++ = lang->value[2];

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

  266.             }

  267.             break;

  268.         case CODEC_TYPE_SUBTITLE:

  269.             {

  270.                 const char *language;

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

  272.                 *q++ = 0x59;

  273.                 *q++ = 8;

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

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

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

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

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

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

  280.             }

  281.             break;

  282.         case CODEC_TYPE_VIDEO:

  283.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  285.                 *q++ = 4;

  286.                 *q++ = 'd';

  287.                 *q++ = 'r';

  288.                 *q++ = 'a';

  289.                 *q++ = 'c';

  290.             }

  291.             break;

  292.         }

  293. 

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

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

  296.         desc_length_ptr[1] = val;

  297.     }

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

  299.                           data, q - data);

  300. }

  301. 

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

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

  304. {

  305.     uint8_t *q;

  306.     int len;

  307. 

  308.     q = *q_ptr;

  309.     if (!str)

  310.         len = 0;

  311.     else

  312.         len = strlen(str);

  313.     *q++ = len;

  314.     memcpy(q, str, len);

  315.     q += len;

  316.     *q_ptr = q;

  317. }

  318. 

  319. static void mpegts_write_sdt(AVFormatContext *s)

  320. {

  321.     MpegTSWrite *ts = s->priv_data;

  322.     MpegTSService *service;

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

  324.     int i, running_status, free_ca_mode, val;

  325. 

  326.     q = data;

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

  328.     *q++ = 0xff;

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

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

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

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

  333.         desc_list_len_ptr = q;

  334.         q += 2;

  335.         running_status = 4; /* running */

  336.         free_ca_mode = 0;

  337. 

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

  339.         *q++ = 0x48;

  340.         desc_len_ptr = q;

  341.         q++;

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

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

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

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

  346. 

  347.         /* fill descriptor length */

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

  349.             (q - desc_list_len_ptr - 2);

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

  351.         desc_list_len_ptr[1] = val;

  352.     }

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

  354.                           data, q - data);

  355. }

  356. 

  357. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  358.                                          int sid,

  359.                                          const char *provider_name,

  360.                                          const char *name)

  361. {

  362.     MpegTSService *service;

  363. 

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

  365.     if (!service)

  366.         return NULL;

  367.     service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;

  368.     service->sid = sid;

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

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

  371.     service->pcr_pid = 0x1fff;

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

  373.     return service;

  374. }

  375. 

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

  377. {

  378.     AVFormatContext *ctx = s->opaque;

  379.     put_buffer(ctx->pb, packet, TS_PACKET_SIZE);

  380. }

  381. 

  382. static int mpegts_write_header(AVFormatContext *s)

  383. {

  384.     MpegTSWrite *ts = s->priv_data;

  385.     MpegTSWriteStream *ts_st;

  386.     MpegTSService *service;

  387.     AVStream *st, *pcr_st = NULL;

  388.     AVMetadataTag *title;

  389.     int i;

  390.     const char *service_name;

  391. 

  392.     ts->tsid = DEFAULT_TSID;

  393.     ts->onid = DEFAULT_ONID;

  394.     /* allocate a single DVB service */

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

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

  397.     service = mpegts_add_service(ts, DEFAULT_SID,

  398.                                  DEFAULT_PROVIDER_NAME, service_name);

  399.     service->pmt.write_packet = section_write_packet;

  400.     service->pmt.opaque = s;

  401.     service->pmt.cc = 15;

  402. 

  403.     ts->pat.pid = PAT_PID;

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

  405.     ts->pat.write_packet = section_write_packet;

  406.     ts->pat.opaque = s;

  407. 

  408.     ts->sdt.pid = SDT_PID;

  409.     ts->sdt.cc = 15;

  410.     ts->sdt.write_packet = section_write_packet;

  411.     ts->sdt.opaque = s;

  412. 

  413.     /* assign pids to each stream */

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

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

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

  417.         if (!ts_st)

  418.             goto fail;

  419.         st->priv_data = ts_st;

  420.         ts_st->service = service;

  421.         ts_st->pid = DEFAULT_START_PID + i;

  422.         ts_st->payload_pts = AV_NOPTS_VALUE;

  423.         ts_st->payload_dts = AV_NOPTS_VALUE;

  424.         ts_st->first_pts_check = 1;

  425.         ts_st->cc = 15;

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

  427.         if (st->codec->codec_type == CODEC_TYPE_VIDEO &&

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

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

  430.             pcr_st = st;

  431.         }

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

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

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

  435.             if (!ts_st->adts)

  436.                 return AVERROR_NOMEM;

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

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

  439.                 return -1;

  440.         }

  441.     }

  442. 

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

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

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

  446.         ts_st = pcr_st->priv_data;

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

  448.     }

  449. 

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

  451. 

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

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

  454.             (TS_PACKET_SIZE * 8 * 1000);

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

  456.             (TS_PACKET_SIZE * 8 * 1000);

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

  458.             (TS_PACKET_SIZE * 8 * 1000);

  459. 

  460.         ts->cur_pcr = av_rescale(s->max_delay, 90000, AV_TIME_BASE);

  461.     } else {

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

  463.         ts->sdt_packet_period = 200;

  464.         ts->pat_packet_period = 40;

  465.         if (pcr_st->codec->codec_type == CODEC_TYPE_AUDIO) {

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

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

  468.                 service->pcr_packet_period =

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

  470.             } else {

  471.                 service->pcr_packet_period =

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

  473.             }

  474.         } else {

  475.             // max delta PCR 0.1s

  476.             service->pcr_packet_period =

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

  478.         }

  479.     }

  480. 

  481.     // output a PCR as soon as possible

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

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

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

  485. 

  486.     av_log(s, AV_LOG_INFO,

  487.            "muxrate %d bps, pcr every %d pkts, "

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

  489.            ts->mux_rate, service->pcr_packet_period,

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

  491. 

  492. 

  493.     put_flush_packet(s->pb);

  494. 

  495.     return 0;

  496. 

  497.  fail:

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

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

  500.         av_free(st->priv_data);

  501.     }

  502.     return -1;

  503. }

  504. 

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

  506. static void retransmit_si_info(AVFormatContext *s)

  507. {

  508.     MpegTSWrite *ts = s->priv_data;

  509.     int i;

  510. 

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

  512.         ts->sdt_packet_count = 0;

  513.         mpegts_write_sdt(s);

  514.     }

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

  516.         ts->pat_packet_count = 0;

  517.         mpegts_write_pat(s);

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

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

  520.         }

  521.     }

  522. }

  523. 

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

  525. static void mpegts_insert_null_packet(AVFormatContext *s)

  526. {

  527.     MpegTSWrite *ts = s->priv_data;

  528.     uint8_t *q;

  529.     uint8_t buf[TS_PACKET_SIZE];

  530. 

  531.     q = buf;

  532.     *q++ = 0x47;

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

  534.     *q++ = 0xff;

  535.     *q++ = 0x10;

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

  537.     put_buffer(s->pb, buf, TS_PACKET_SIZE);

  538.     ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;

  539. }

  540. 

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

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

  543. {

  544.     MpegTSWrite *ts = s->priv_data;

  545.     MpegTSWriteStream *ts_st = st->priv_data;

  546.     uint8_t *q;

  547.     uint64_t pcr = ts->cur_pcr;

  548.     uint8_t buf[TS_PACKET_SIZE];

  549. 

  550.     q = buf;

  551.     *q++ = 0x47;

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

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

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

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

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

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

  558. 

  559.     /* PCR coded into 6 bytes */

  560.     *q++ = pcr >> 25;

  561.     *q++ = pcr >> 17;

  562.     *q++ = pcr >> 9;

  563.     *q++ = pcr >> 1;

  564.     *q++ = (pcr & 1) << 7;

  565.     *q++ = 0;

  566. 

  567.     /* stuffing bytes */

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

  569.     put_buffer(s->pb, buf, TS_PACKET_SIZE);

  570.     ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;

  571. }

  572. 

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

  574. {

  575.     int val;

  576. 

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

  578.     *q++ = val;

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

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

  581.     *q++ = val;

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

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

  584.     *q++ = val;

  585. }

  586. 

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

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

  589.  * to exactly fill the last ts packet.

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

  591.  */

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

  593.                              const uint8_t *payload, int payload_size,

  594.                              int64_t pts, int64_t dts)

  595. {

  596.     MpegTSWriteStream *ts_st = st->priv_data;

  597.     MpegTSWrite *ts = s->priv_data;

  598.     uint8_t buf[TS_PACKET_SIZE];

  599.     uint8_t *q;

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

  601.     int afc_len, stuffing_len;

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

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

  604. 

  605.     is_start = 1;

  606.     while (payload_size > 0) {

  607.         retransmit_si_info(s);

  608. 

  609.         write_pcr = 0;

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

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

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

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

  614.                 ts_st->service->pcr_packet_period) {

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

  616.                 write_pcr = 1;

  617.             }

  618.         }

  619. 

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

  621.             (dts - (int64_t)ts->cur_pcr) > delay) {

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

  623.             if (write_pcr)

  624.                 mpegts_insert_pcr_only(s, st);

  625.             else

  626.                 mpegts_insert_null_packet(s);

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

  628.         }

  629. 

  630.         /* prepare packet header */

  631.         q = buf;

  632.         *q++ = 0x47;

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

  634.         if (is_start)

  635.             val |= 0x40;

  636.         *q++ = val;

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

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

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

  640.         if (write_pcr) {

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

  642.             if (ts->mux_rate > 1)

  643.                 pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;

  644.             else

  645.                 pcr = dts - delay;

  646.             if (dts != AV_NOPTS_VALUE && dts < pcr)

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

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

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

  650.             *q++ = pcr >> 25;

  651.             *q++ = pcr >> 17;

  652.             *q++ = pcr >> 9;

  653.             *q++ = pcr >> 1;

  654.             *q++ = (pcr & 1) << 7;

  655.             *q++ = 0;

  656.         }

  657.         if (is_start) {

  658.             int pes_extension = 0;

  659.             /* write PES header */

  660.             *q++ = 0x00;

  661.             *q++ = 0x00;

  662.             *q++ = 0x01;

  663.             private_code = 0;

  664.             if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

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

  666.                     *q++ = 0xfd;

  667.                 } else

  668.                     *q++ = 0xe0;

  669.             } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&

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

  671.                         st->codec->codec_id == CODEC_ID_MP3)) {

  672.                 *q++ = 0xc0;

  673.             } else {

  674.                 *q++ = 0xbd;

  675.                 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {

  676.                     private_code = 0x20;

  677.                 }

  678.             }

  679.             header_len = 0;

  680.             flags = 0;

  681.             if (pts != AV_NOPTS_VALUE) {

  682.                 header_len += 5;

  683.                 flags |= 0x80;

  684.             }

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

  686.                 header_len += 5;

  687.                 flags |= 0x40;

  688.             }

  689.             if (st->codec->codec_type == CODEC_TYPE_VIDEO &&

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

  691.                 /* set PES_extension_flag */

  692.                 pes_extension = 1;

  693.                 flags |= 0x01;

  694. 

  695.                 /*

  696.                 * One byte for PES2 extension flag +

  697.                 * one byte for extension length +

  698.                 * one byte for extension id

  699.                 */

  700.                 header_len += 3;

  701.             }

  702.             len = payload_size + header_len + 3;

  703.             if (private_code != 0)

  704.                 len++;

  705.             if (len > 0xffff)

  706.                 len = 0;

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

  708.             *q++ = len;

  709.             val = 0x80;

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

  711.             if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)

  712.                 val |= 0x04;

  713.             *q++ = val;

  714.             *q++ = flags;

  715.             *q++ = header_len;

  716.             if (pts != AV_NOPTS_VALUE) {

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

  718.                 q += 5;

  719.             }

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

  721.                 write_pts(q, 1, dts);

  722.                 q += 5;

  723.             }

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

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

  726.                 *q++ = flags;

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

  728.                 /*

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

  730.                 * write the extended stream id

  731.                 */

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

  733.             }

  734.             if (private_code != 0)

  735.                 *q++ = private_code;

  736.             is_start = 0;

  737.         }

  738.         /* header size */

  739.         header_len = q - buf;

  740.         /* data len */

  741.         len = TS_PACKET_SIZE - header_len;

  742.         if (len > payload_size)

  743.             len = payload_size;

  744.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  745.         if (stuffing_len > 0) {

  746.             /* add stuffing with AFC */

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

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

  749.                 afc_len = buf[4] + 1;

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

  751.                         buf + 4 + afc_len,

  752.                         header_len - (4 + afc_len));

  753.                 buf[4] += stuffing_len;

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

  755.             } else {

  756.                 /* add stuffing */

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

  758.                 buf[3] |= 0x20;

  759.                 buf[4] = stuffing_len - 1;

  760.                 if (stuffing_len >= 2) {

  761.                     buf[5] = 0x00;

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

  763.                 }

  764.             }

  765.         }

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

  767.         payload += len;

  768.         payload_size -= len;

  769.         put_buffer(s->pb, buf, TS_PACKET_SIZE);

  770.         ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;

  771.     }

  772.     put_flush_packet(s->pb);

  773. }

  774. 

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

  776. {

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

  778.     int size = pkt->size;

  779.     uint8_t *buf= pkt->data;

  780.     uint8_t *data= NULL;

  781.     MpegTSWriteStream *ts_st = st->priv_data;

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

  783.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  784. 

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

  786.         pts = pkt->pts + delay;

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

  788.         dts = pkt->dts + delay;

  789. 

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

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

  792.         return -1;

  793.     }

  794.     ts_st->first_pts_check = 0;

  795. 

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

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

  798.         uint32_t state = -1;

  799. 

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

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

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

  803.             return -1;

  804.         }

  805. 

  806.         do {

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

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

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

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

  811. 

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

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

  814.             if (!data)

  815.                 return -1;

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

  817.             AV_WB32(data, 0x00000001);

  818.             data[4] = 0x09;

  819.             data[5] = 0xe0; // any slice type

  820.             buf  = data;

  821.             size = pkt->size+6;

  822.         }

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

  824.         if (pkt->size < 2)

  825.             return -1;

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

  827.             ADTSContext *adts = ts_st->adts;

  828.             int new_size;

  829.             if (!adts) {

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

  831.                        "and extradata missing\n");

  832.                 return -1;

  833.             }

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

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

  836.                 return -1;

  837.             data = av_malloc(new_size);

  838.             if (!data)

  839.                 return AVERROR_NOMEM;

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

  841.             if (adts->pce_size) {

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

  843.                 adts->pce_size = 0;

  844.             }

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

  846.             buf = data;

  847.             size = new_size;

  848.         }

  849.     }

  850. 

  851.     if (st->codec->codec_type != CODEC_TYPE_AUDIO) {

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

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

  854.         av_free(data);

  855.         return 0;

  856.     }

  857. 

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

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

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

  861.         ts_st->payload_index = 0;

  862.     }

  863. 

  864.     if (!ts_st->payload_index) {

  865.         ts_st->payload_pts = pts;

  866.         ts_st->payload_dts = dts;

  867.     }

  868. 

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

  870.     ts_st->payload_index += size;

  871. 

  872.     av_free(data);

  873. 

  874.     return 0;

  875. }

  876. 

  877. static int mpegts_write_end(AVFormatContext *s)

  878. {

  879.     MpegTSWrite *ts = s->priv_data;

  880.     MpegTSWriteStream *ts_st;

  881.     MpegTSService *service;

  882.     AVStream *st;

  883.     int i;

  884. 

  885.     /* flush current packets */

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

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

  888.         ts_st = st->priv_data;

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

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

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

  892.         }

  893.         av_freep(&ts_st->adts);

  894.     }

  895.     put_flush_packet(s->pb);

  896. 

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

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

  899.         av_freep(&service->provider_name);

  900.         av_freep(&service->name);

  901.         av_free(service);

  902.     }

  903.     av_free(ts->services);

  904. 

  905.     return 0;

  906. }

  907. 

  908. AVOutputFormat mpegts_muxer = {

  909.     "mpegts",

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

  911.     "video/x-mpegts",

  912.     "ts,m2t",

  913.     sizeof(MpegTSWrite),

  914.     CODEC_ID_MP2,

  915.     CODEC_ID_MPEG2VIDEO,

  916.     mpegts_write_header,

  917.     mpegts_write_packet,

  918.     mpegts_write_end,

  919. };