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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 "internal.h"

  27. #include "mpegts.h"

  28. #include "adts.h"

  29. 

  30. /* write DVB SI sections */

  31. 

  32. /*********************************************/

  33. /* mpegts section writer */

  34. 

  35. typedef struct MpegTSSection {

  36.     int pid;

  37.     int cc;

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

  39.     void *opaque;

  40. } MpegTSSection;

  41. 

  42. typedef struct MpegTSService {

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

  44.     int sid;           /* service ID */

  45.     char *name;

  46.     char *provider_name;

  47.     int pcr_pid;

  48.     int pcr_packet_count;

  49.     int pcr_packet_period;

  50. } MpegTSService;

  51. 

  52. typedef struct MpegTSWrite {

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

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

  55.     MpegTSService **services;

  56.     int sdt_packet_count;

  57.     int sdt_packet_period;

  58.     int pat_packet_count;

  59.     int pat_packet_period;

  60.     int nb_services;

  61.     int onid;

  62.     int tsid;

  63.     uint64_t cur_pcr;

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

  65. } MpegTSWrite;

  66. 

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

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

  69. {

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

  71.     unsigned int crc;

  72.     unsigned char packet[TS_PACKET_SIZE];

  73.     const unsigned char *buf_ptr;

  74.     unsigned char *q;

  75.     int first, b, len1, left;

  76. 

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

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

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

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

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

  82. 

  83.     /* send each packet */

  84.     buf_ptr = buf;

  85.     while (len > 0) {

  86.         first = (buf == buf_ptr);

  87.         q = packet;

  88.         *q++ = 0x47;

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

  90.         if (first)

  91.             b |= 0x40;

  92.         *q++ = b;

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

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

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

  96.         if (first)

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

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

  99.         if (len1 > len)

  100.             len1 = len;

  101.         memcpy(q, buf_ptr, len1);

  102.         q += len1;

  103.         /* add known padding data */

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

  105.         if (left > 0)

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

  107. 

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

  109. 

  110.         buf_ptr += len1;

  111.         len -= len1;

  112. 

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

  114.     }

  115. }

  116. 

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

  118. {

  119.     uint8_t *q;

  120.     q = *q_ptr;

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

  122.     *q++ = val;

  123.     *q_ptr = q;

  124. }

  125. 

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

  127.                           int version, int sec_num, int last_sec_num,

  128.                           uint8_t *buf, int len)

  129. {

  130.     uint8_t section[1024], *q;

  131.     unsigned int tot_len;

  132. 

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

  134.     /* check if not too big */

  135.     if (tot_len > 1024)

  136.         return -1;

  137. 

  138.     q = section;

  139.     *q++ = tid;

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

  141.     put16(&q, id);

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

  143.     *q++ = sec_num;

  144.     *q++ = last_sec_num;

  145.     memcpy(q, buf, len);

  146. 

  147.     mpegts_write_section(s, section, tot_len);

  148.     return 0;

  149. }

  150. 

  151. /*********************************************/

  152. /* mpegts writer */

  153. 

  154. #define DEFAULT_PMT_START_PID   0x1000

  155. #define DEFAULT_START_PID       0x0100

  156. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  157. #define DEFAULT_SERVICE_NAME    "Service01"

  158. 

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

  160. #define DEFAULT_ONID            0x0001

  161. #define DEFAULT_TSID            0x0001

  162. #define DEFAULT_SID             0x0001

  163. 

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

  165. #define DEFAULT_PES_HEADER_FREQ 16

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

  167. 

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

  169. #define SDT_RETRANS_TIME 500

  170. #define PAT_RETRANS_TIME 100

  171. #define PCR_RETRANS_TIME 20

  172. 

  173. typedef struct MpegTSWriteStream {

  174.     struct MpegTSService *service;

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

  176.     int cc;

  177.     int payload_index;

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

  179.     int64_t payload_pts;

  180.     int64_t payload_dts;

  181.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  182.     ADTSContext *adts;

  183. } MpegTSWriteStream;

  184. 

  185. static void mpegts_write_pat(AVFormatContext *s)

  186. {

  187.     MpegTSWrite *ts = s->priv_data;

  188.     MpegTSService *service;

  189.     uint8_t data[1012], *q;

  190.     int i;

  191. 

  192.     q = data;

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

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

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

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

  197.     }

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

  199.                           data, q - data);

  200. }

  201. 

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

  203. {

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

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

  206.     int val, stream_type, i;

  207. 

  208.     q = data;

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

  210. 

  211.     program_info_length_ptr = q;

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

  213. 

  214.     /* put program info here */

  215. 

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

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

  218.     program_info_length_ptr[1] = val;

  219. 

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

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

  222.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  225.         case CODEC_ID_MPEG1VIDEO:

  226.         case CODEC_ID_MPEG2VIDEO:

  227.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  228.             break;

  229.         case CODEC_ID_MPEG4:

  230.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  231.             break;

  232.         case CODEC_ID_H264:

  233.             stream_type = STREAM_TYPE_VIDEO_H264;

  234.             break;

  235.         case CODEC_ID_DIRAC:

  236.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  237.             break;

  238.         case CODEC_ID_MP2:

  239.         case CODEC_ID_MP3:

  240.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  241.             break;

  242.         case CODEC_ID_AAC:

  243.             stream_type = STREAM_TYPE_AUDIO_AAC;

  244.             break;

  245.         case CODEC_ID_AC3:

  246.             stream_type = STREAM_TYPE_AUDIO_AC3;

  247.             break;

  248.         default:

  249.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  250.             break;

  251.         }

  252.         *q++ = stream_type;

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

  254.         desc_length_ptr = q;

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

  256. 

  257.         /* write optional descriptors here */

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

  259.         case AVMEDIA_TYPE_AUDIO:

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

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

  262.                 *q++ = 4;

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

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

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

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

  267.             }

  268.             break;

  269.         case AVMEDIA_TYPE_SUBTITLE:

  270.             {

  271.                 const char *language;

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

  273.                 *q++ = 0x59;

  274.                 *q++ = 8;

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

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

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

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

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

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

  281.             }

  282.             break;

  283.         case AVMEDIA_TYPE_VIDEO:

  284.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  286.                 *q++ = 4;

  287.                 *q++ = 'd';

  288.                 *q++ = 'r';

  289.                 *q++ = 'a';

  290.                 *q++ = 'c';

  291.             }

  292.             break;

  293.         }

  294. 

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

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

  297.         desc_length_ptr[1] = val;

  298.     }

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

  300.                           data, q - data);

  301. }

  302. 

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

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

  305. {

  306.     uint8_t *q;

  307.     int len;

  308. 

  309.     q = *q_ptr;

  310.     if (!str)

  311.         len = 0;

  312.     else

  313.         len = strlen(str);

  314.     *q++ = len;

  315.     memcpy(q, str, len);

  316.     q += len;

  317.     *q_ptr = q;

  318. }

  319. 

  320. static void mpegts_write_sdt(AVFormatContext *s)

  321. {

  322.     MpegTSWrite *ts = s->priv_data;

  323.     MpegTSService *service;

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

  325.     int i, running_status, free_ca_mode, val;

  326. 

  327.     q = data;

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

  329.     *q++ = 0xff;

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

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

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

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

  334.         desc_list_len_ptr = q;

  335.         q += 2;

  336.         running_status = 4; /* running */

  337.         free_ca_mode = 0;

  338. 

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

  340.         *q++ = 0x48;

  341.         desc_len_ptr = q;

  342.         q++;

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

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

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

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

  347. 

  348.         /* fill descriptor length */

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

  350.             (q - desc_list_len_ptr - 2);

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

  352.         desc_list_len_ptr[1] = val;

  353.     }

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

  355.                           data, q - data);

  356. }

  357. 

  358. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  359.                                          int sid,

  360.                                          const char *provider_name,

  361.                                          const char *name)

  362. {

  363.     MpegTSService *service;

  364. 

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

  366.     if (!service)

  367.         return NULL;

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

  369.     service->sid = sid;

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

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

  372.     service->pcr_pid = 0x1fff;

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

  374.     return service;

  375. }

  376. 

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

  378. {

  379.     AVFormatContext *ctx = s->opaque;

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

  381. }

  382. 

  383. static int mpegts_write_header(AVFormatContext *s)

  384. {

  385.     MpegTSWrite *ts = s->priv_data;

  386.     MpegTSWriteStream *ts_st;

  387.     MpegTSService *service;

  388.     AVStream *st, *pcr_st = NULL;

  389.     AVMetadataTag *title;

  390.     int i;

  391.     const char *service_name;

  392. 

  393.     ts->tsid = DEFAULT_TSID;

  394.     ts->onid = DEFAULT_ONID;

  395.     /* allocate a single DVB service */

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

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

  398.     service = mpegts_add_service(ts, DEFAULT_SID,

  399.                                  DEFAULT_PROVIDER_NAME, service_name);

  400.     service->pmt.write_packet = section_write_packet;

  401.     service->pmt.opaque = s;

  402.     service->pmt.cc = 15;

  403. 

  404.     ts->pat.pid = PAT_PID;

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

  406.     ts->pat.write_packet = section_write_packet;

  407.     ts->pat.opaque = s;

  408. 

  409.     ts->sdt.pid = SDT_PID;

  410.     ts->sdt.cc = 15;

  411.     ts->sdt.write_packet = section_write_packet;

  412.     ts->sdt.opaque = s;

  413. 

  414.     /* assign pids to each stream */

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

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

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

  418.         if (!ts_st)

  419.             goto fail;

  420.         st->priv_data = ts_st;

  421.         ts_st->service = service;

  422.         ts_st->pid = DEFAULT_START_PID + i;

  423.         ts_st->payload_pts = AV_NOPTS_VALUE;

  424.         ts_st->payload_dts = AV_NOPTS_VALUE;

  425.         ts_st->first_pts_check = 1;

  426.         ts_st->cc = 15;

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

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

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

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

  431.             pcr_st = st;

  432.         }

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

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

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

  436.             if (!ts_st->adts)

  437.                 return AVERROR(ENOMEM);

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

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

  440.                 return -1;

  441.         }

  442.     }

  443. 

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

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

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

  447.         ts_st = pcr_st->priv_data;

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

  449.     }

  450. 

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

  452. 

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

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

  455.             (TS_PACKET_SIZE * 8 * 1000);

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

  457.             (TS_PACKET_SIZE * 8 * 1000);

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

  459.             (TS_PACKET_SIZE * 8 * 1000);

  460. 

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

  462.     } else {

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

  464.         ts->sdt_packet_period = 200;

  465.         ts->pat_packet_period = 40;

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

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

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

  469.                 service->pcr_packet_period =

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

  471.             } else {

  472.                 service->pcr_packet_period =

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

  474.             }

  475.         } else {

  476.             // max delta PCR 0.1s

  477.             service->pcr_packet_period =

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

  479.         }

  480.     }

  481. 

  482.     // output a PCR as soon as possible

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

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

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

  486. 

  487.     av_log(s, AV_LOG_INFO,

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

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

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

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

  492. 

  493. 

  494.     put_flush_packet(s->pb);

  495. 

  496.     return 0;

  497. 

  498.  fail:

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

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

  501.         av_free(st->priv_data);

  502.     }

  503.     return -1;

  504. }

  505. 

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

  507. static void retransmit_si_info(AVFormatContext *s)

  508. {

  509.     MpegTSWrite *ts = s->priv_data;

  510.     int i;

  511. 

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

  513.         ts->sdt_packet_count = 0;

  514.         mpegts_write_sdt(s);

  515.     }

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

  517.         ts->pat_packet_count = 0;

  518.         mpegts_write_pat(s);

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

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

  521.         }

  522.     }

  523. }

  524. 

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

  526. static void mpegts_insert_null_packet(AVFormatContext *s)

  527. {

  528.     MpegTSWrite *ts = s->priv_data;

  529.     uint8_t *q;

  530.     uint8_t buf[TS_PACKET_SIZE];

  531. 

  532.     q = buf;

  533.     *q++ = 0x47;

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

  535.     *q++ = 0xff;

  536.     *q++ = 0x10;

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

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

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

  540. }

  541. 

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

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

  544. {

  545.     MpegTSWrite *ts = s->priv_data;

  546.     MpegTSWriteStream *ts_st = st->priv_data;

  547.     uint8_t *q;

  548.     uint64_t pcr = ts->cur_pcr;

  549.     uint8_t buf[TS_PACKET_SIZE];

  550. 

  551.     q = buf;

  552.     *q++ = 0x47;

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

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

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

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

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

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

  559. 

  560.     /* PCR coded into 6 bytes */

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

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

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

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

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

  566.     *q++ = 0;

  567. 

  568.     /* stuffing bytes */

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

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

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

  572. }

  573. 

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

  575. {

  576.     int val;

  577. 

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

  579.     *q++ = val;

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

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

  582.     *q++ = val;

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

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

  585.     *q++ = val;

  586. }

  587. 

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

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

  590.  * to exactly fill the last ts packet.

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

  592.  */

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

  594.                              const uint8_t *payload, int payload_size,

  595.                              int64_t pts, int64_t dts)

  596. {

  597.     MpegTSWriteStream *ts_st = st->priv_data;

  598.     MpegTSWrite *ts = s->priv_data;

  599.     uint8_t buf[TS_PACKET_SIZE];

  600.     uint8_t *q;

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

  602.     int afc_len, stuffing_len;

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

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

  605. 

  606.     is_start = 1;

  607.     while (payload_size > 0) {

  608.         retransmit_si_info(s);

  609. 

  610.         write_pcr = 0;

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

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

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

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

  615.                 ts_st->service->pcr_packet_period) {

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

  617.                 write_pcr = 1;

  618.             }

  619.         }

  620. 

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

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

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

  624.             if (write_pcr)

  625.                 mpegts_insert_pcr_only(s, st);

  626.             else

  627.                 mpegts_insert_null_packet(s);

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

  629.         }

  630. 

  631.         /* prepare packet header */

  632.         q = buf;

  633.         *q++ = 0x47;

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

  635.         if (is_start)

  636.             val |= 0x40;

  637.         *q++ = val;

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

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

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

  641.         if (write_pcr) {

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

  643.             if (ts->mux_rate > 1)

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

  645.             else

  646.                 pcr = dts - delay;

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

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

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

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

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

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

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

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

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

  656.             *q++ = 0;

  657.         }

  658.         if (is_start) {

  659.             int pes_extension = 0;

  660.             /* write PES header */

  661.             *q++ = 0x00;

  662.             *q++ = 0x00;

  663.             *q++ = 0x01;

  664.             private_code = 0;

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

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

  667.                     *q++ = 0xfd;

  668.                 } else

  669.                     *q++ = 0xe0;

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

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

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

  673.                 *q++ = 0xc0;

  674.             } else {

  675.                 *q++ = 0xbd;

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

  677.                     private_code = 0x20;

  678.                 }

  679.             }

  680.             header_len = 0;

  681.             flags = 0;

  682.             if (pts != AV_NOPTS_VALUE) {

  683.                 header_len += 5;

  684.                 flags |= 0x80;

  685.             }

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

  687.                 header_len += 5;

  688.                 flags |= 0x40;

  689.             }

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

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

  692.                 /* set PES_extension_flag */

  693.                 pes_extension = 1;

  694.                 flags |= 0x01;

  695. 

  696.                 /*

  697.                 * One byte for PES2 extension flag +

  698.                 * one byte for extension length +

  699.                 * one byte for extension id

  700.                 */

  701.                 header_len += 3;

  702.             }

  703.             len = payload_size + header_len + 3;

  704.             if (private_code != 0)

  705.                 len++;

  706.             if (len > 0xffff)

  707.                 len = 0;

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

  709.             *q++ = len;

  710.             val = 0x80;

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

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

  713.                 val |= 0x04;

  714.             *q++ = val;

  715.             *q++ = flags;

  716.             *q++ = header_len;

  717.             if (pts != AV_NOPTS_VALUE) {

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

  719.                 q += 5;

  720.             }

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

  722.                 write_pts(q, 1, dts);

  723.                 q += 5;

  724.             }

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

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

  727.                 *q++ = flags;

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

  729.                 /*

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

  731.                 * write the extended stream id

  732.                 */

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

  734.             }

  735.             if (private_code != 0)

  736.                 *q++ = private_code;

  737.             is_start = 0;

  738.         }

  739.         /* header size */

  740.         header_len = q - buf;

  741.         /* data len */

  742.         len = TS_PACKET_SIZE - header_len;

  743.         if (len > payload_size)

  744.             len = payload_size;

  745.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  746.         if (stuffing_len > 0) {

  747.             /* add stuffing with AFC */

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

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

  750.                 afc_len = buf[4] + 1;

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

  752.                         buf + 4 + afc_len,

  753.                         header_len - (4 + afc_len));

  754.                 buf[4] += stuffing_len;

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

  756.             } else {

  757.                 /* add stuffing */

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

  759.                 buf[3] |= 0x20;

  760.                 buf[4] = stuffing_len - 1;

  761.                 if (stuffing_len >= 2) {

  762.                     buf[5] = 0x00;

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

  764.                 }

  765.             }

  766.         }

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

  768.         payload += len;

  769.         payload_size -= len;

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

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

  772.     }

  773.     put_flush_packet(s->pb);

  774. }

  775. 

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

  777. {

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

  779.     int size = pkt->size;

  780.     uint8_t *buf= pkt->data;

  781.     uint8_t *data= NULL;

  782.     MpegTSWriteStream *ts_st = st->priv_data;

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

  784.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  785. 

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

  787.         pts = pkt->pts + delay;

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

  789.         dts = pkt->dts + delay;

  790. 

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

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

  793.         return -1;

  794.     }

  795.     ts_st->first_pts_check = 0;

  796. 

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

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

  799.         uint32_t state = -1;

  800. 

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

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

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

  804.             return -1;

  805.         }

  806. 

  807.         do {

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

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

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

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

  812. 

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

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

  815.             if (!data)

  816.                 return -1;

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

  818.             AV_WB32(data, 0x00000001);

  819.             data[4] = 0x09;

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

  821.             buf  = data;

  822.             size = pkt->size+6;

  823.         }

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

  825.         if (pkt->size < 2)

  826.             return -1;

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

  828.             ADTSContext *adts = ts_st->adts;

  829.             int new_size;

  830.             if (!adts) {

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

  832.                        "and extradata missing\n");

  833.                 return -1;

  834.             }

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

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

  837.                 return -1;

  838.             data = av_malloc(new_size);

  839.             if (!data)

  840.                 return AVERROR(ENOMEM);

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

  842.             if (adts->pce_size) {

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

  844.                 adts->pce_size = 0;

  845.             }

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

  847.             buf = data;

  848.             size = new_size;

  849.         }

  850.     }

  851. 

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

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

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

  855.         av_free(data);

  856.         return 0;

  857.     }

  858. 

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

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

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

  862.         ts_st->payload_index = 0;

  863.     }

  864. 

  865.     if (!ts_st->payload_index) {

  866.         ts_st->payload_pts = pts;

  867.         ts_st->payload_dts = dts;

  868.     }

  869. 

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

  871.     ts_st->payload_index += size;

  872. 

  873.     av_free(data);

  874. 

  875.     return 0;

  876. }

  877. 

  878. static int mpegts_write_end(AVFormatContext *s)

  879. {

  880.     MpegTSWrite *ts = s->priv_data;

  881.     MpegTSWriteStream *ts_st;

  882.     MpegTSService *service;

  883.     AVStream *st;

  884.     int i;

  885. 

  886.     /* flush current packets */

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

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

  889.         ts_st = st->priv_data;

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

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

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

  893.         }

  894.         av_freep(&ts_st->adts);

  895.     }

  896.     put_flush_packet(s->pb);

  897. 

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

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

  900.         av_freep(&service->provider_name);

  901.         av_freep(&service->name);

  902.         av_free(service);

  903.     }

  904.     av_free(ts->services);

  905. 

  906.     return 0;

  907. }

  908. 

  909. AVOutputFormat mpegts_muxer = {

  910.     "mpegts",

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

  912.     "video/x-mpegts",

  913.     "ts,m2t",

  914.     sizeof(MpegTSWrite),

  915.     CODEC_ID_MP2,

  916.     CODEC_ID_MPEG2VIDEO,

  917.     mpegts_write_header,

  918.     mpegts_write_packet,

  919.     mpegts_write_end,

  920. };