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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. 

  28. /* write DVB SI sections */

  29. 

  30. /*********************************************/

  31. /* mpegts section writer */

  32. 

  33. typedef struct MpegTSSection {

  34.     int pid;

  35.     int cc;

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

  37.     void *opaque;

  38. } MpegTSSection;

  39. 

  40. typedef struct MpegTSService {

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

  42.     int sid;           /* service ID */

  43.     char *name;

  44.     char *provider_name;

  45.     int pcr_pid;

  46.     int pcr_packet_count;

  47.     int pcr_packet_period;

  48. } MpegTSService;

  49. 

  50. typedef struct MpegTSWrite {

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

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

  53.     MpegTSService **services;

  54.     int sdt_packet_count;

  55.     int sdt_packet_period;

  56.     int pat_packet_count;

  57.     int pat_packet_period;

  58.     int nb_services;

  59.     int onid;

  60.     int tsid;

  61.     uint64_t cur_pcr;

  62.     int mux_rate;

  63. } MpegTSWrite;

  64. 

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

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

  67. {

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

  69.     unsigned int crc;

  70.     unsigned char packet[TS_PACKET_SIZE];

  71.     const unsigned char *buf_ptr;

  72.     unsigned char *q;

  73.     int first, b, len1, left;

  74. 

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

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

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

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

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

  80. 

  81.     /* send each packet */

  82.     buf_ptr = buf;

  83.     while (len > 0) {

  84.         first = (buf == buf_ptr);

  85.         q = packet;

  86.         *q++ = 0x47;

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

  88.         if (first)

  89.             b |= 0x40;

  90.         *q++ = b;

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

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

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

  94.         if (first)

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

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

  97.         if (len1 > len)

  98.             len1 = len;

  99.         memcpy(q, buf_ptr, len1);

  100.         q += len1;

  101.         /* add known padding data */

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

  103.         if (left > 0)

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

  105. 

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

  107. 

  108.         buf_ptr += len1;

  109.         len -= len1;

  110. 

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

  112.     }

  113. }

  114. 

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

  116. {

  117.     uint8_t *q;

  118.     q = *q_ptr;

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

  120.     *q++ = val;

  121.     *q_ptr = q;

  122. }

  123. 

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

  125.                           int version, int sec_num, int last_sec_num,

  126.                           uint8_t *buf, int len)

  127. {

  128.     uint8_t section[1024], *q;

  129.     unsigned int tot_len;

  130. 

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

  132.     /* check if not too big */

  133.     if (tot_len > 1024)

  134.         return -1;

  135. 

  136.     q = section;

  137.     *q++ = tid;

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

  139.     put16(&q, id);

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

  141.     *q++ = sec_num;

  142.     *q++ = last_sec_num;

  143.     memcpy(q, buf, len);

  144. 

  145.     mpegts_write_section(s, section, tot_len);

  146.     return 0;

  147. }

  148. 

  149. /*********************************************/

  150. /* mpegts writer */

  151. 

  152. #define DEFAULT_PMT_START_PID   0x1000

  153. #define DEFAULT_START_PID       0x0100

  154. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  155. #define DEFAULT_SERVICE_NAME    "Service01"

  156. 

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

  158. #define DEFAULT_ONID            0x0001

  159. #define DEFAULT_TSID            0x0001

  160. #define DEFAULT_SID             0x0001

  161. 

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

  163. #define DEFAULT_PES_HEADER_FREQ 16

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

  165. 

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

  167. #define SDT_RETRANS_TIME 500

  168. #define PAT_RETRANS_TIME 100

  169. #define PCR_RETRANS_TIME 20

  170. 

  171. typedef struct MpegTSWriteStream {

  172.     struct MpegTSService *service;

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

  174.     int cc;

  175.     int payload_index;

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

  177.     int64_t payload_pts;

  178.     int64_t payload_dts;

  179.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  180. } MpegTSWriteStream;

  181. 

  182. static void mpegts_write_pat(AVFormatContext *s)

  183. {

  184.     MpegTSWrite *ts = s->priv_data;

  185.     MpegTSService *service;

  186.     uint8_t data[1012], *q;

  187.     int i;

  188. 

  189.     q = data;

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

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

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

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

  194.     }

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

  196.                           data, q - data);

  197. }

  198. 

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

  200. {

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

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

  203.     int val, stream_type, i;

  204. 

  205.     q = data;

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

  207. 

  208.     program_info_length_ptr = q;

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

  210. 

  211.     /* put program info here */

  212. 

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

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

  215.     program_info_length_ptr[1] = val;

  216. 

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

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

  219.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  222.         case CODEC_ID_MPEG1VIDEO:

  223.         case CODEC_ID_MPEG2VIDEO:

  224.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  225.             break;

  226.         case CODEC_ID_MPEG4:

  227.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  228.             break;

  229.         case CODEC_ID_H264:

  230.             stream_type = STREAM_TYPE_VIDEO_H264;

  231.             break;

  232.         case CODEC_ID_DIRAC:

  233.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  234.             break;

  235.         case CODEC_ID_MP2:

  236.         case CODEC_ID_MP3:

  237.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  238.             break;

  239.         case CODEC_ID_AAC:

  240.             stream_type = STREAM_TYPE_AUDIO_AAC;

  241.             break;

  242.         case CODEC_ID_AC3:

  243.             stream_type = STREAM_TYPE_AUDIO_AC3;

  244.             break;

  245.         default:

  246.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  247.             break;

  248.         }

  249.         *q++ = stream_type;

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

  251.         desc_length_ptr = q;

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

  253. 

  254.         /* write optional descriptors here */

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

  256.         case CODEC_TYPE_AUDIO:

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

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

  259.                 *q++ = 4;

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

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

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

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

  264.             }

  265.             break;

  266.         case CODEC_TYPE_SUBTITLE:

  267.             {

  268.                 const char *language;

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

  270.                 *q++ = 0x59;

  271.                 *q++ = 8;

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

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

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

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

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

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

  278.             }

  279.             break;

  280.         case CODEC_TYPE_VIDEO:

  281.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  283.                 *q++ = 4;

  284.                 *q++ = 'd';

  285.                 *q++ = 'r';

  286.                 *q++ = 'a';

  287.                 *q++ = 'c';

  288.             }

  289.             break;

  290.         }

  291. 

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

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

  294.         desc_length_ptr[1] = val;

  295.     }

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

  297.                           data, q - data);

  298. }

  299. 

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

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

  302. {

  303.     uint8_t *q;

  304.     int len;

  305. 

  306.     q = *q_ptr;

  307.     if (!str)

  308.         len = 0;

  309.     else

  310.         len = strlen(str);

  311.     *q++ = len;

  312.     memcpy(q, str, len);

  313.     q += len;

  314.     *q_ptr = q;

  315. }

  316. 

  317. static void mpegts_write_sdt(AVFormatContext *s)

  318. {

  319.     MpegTSWrite *ts = s->priv_data;

  320.     MpegTSService *service;

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

  322.     int i, running_status, free_ca_mode, val;

  323. 

  324.     q = data;

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

  326.     *q++ = 0xff;

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

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

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

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

  331.         desc_list_len_ptr = q;

  332.         q += 2;

  333.         running_status = 4; /* running */

  334.         free_ca_mode = 0;

  335. 

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

  337.         *q++ = 0x48;

  338.         desc_len_ptr = q;

  339.         q++;

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

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

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

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

  344. 

  345.         /* fill descriptor length */

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

  347.             (q - desc_list_len_ptr - 2);

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

  349.         desc_list_len_ptr[1] = val;

  350.     }

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

  352.                           data, q - data);

  353. }

  354. 

  355. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  356.                                          int sid,

  357.                                          const char *provider_name,

  358.                                          const char *name)

  359. {

  360.     MpegTSService *service;

  361. 

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

  363.     if (!service)

  364.         return NULL;

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

  366.     service->sid = sid;

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

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

  369.     service->pcr_pid = 0x1fff;

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

  371.     return service;

  372. }

  373. 

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

  375. {

  376.     AVFormatContext *ctx = s->opaque;

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

  378. }

  379. 

  380. static int mpegts_write_header(AVFormatContext *s)

  381. {

  382.     MpegTSWrite *ts = s->priv_data;

  383.     MpegTSWriteStream *ts_st;

  384.     MpegTSService *service;

  385.     AVStream *st;

  386.     AVMetadataTag *title;

  387.     int i, total_bit_rate;

  388.     const char *service_name;

  389.     uint64_t sdt_size, pat_pmt_size, pos;

  390. 

  391.     ts->tsid = DEFAULT_TSID;

  392.     ts->onid = DEFAULT_ONID;

  393.     /* allocate a single DVB service */

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

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

  396.     service = mpegts_add_service(ts, DEFAULT_SID,

  397.                                  DEFAULT_PROVIDER_NAME, service_name);

  398.     service->pmt.write_packet = section_write_packet;

  399.     service->pmt.opaque = s;

  400. 

  401.     ts->pat.pid = PAT_PID;

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

  403.     ts->pat.write_packet = section_write_packet;

  404.     ts->pat.opaque = s;

  405. 

  406.     ts->sdt.pid = SDT_PID;

  407.     ts->sdt.cc = 15;

  408.     ts->sdt.write_packet = section_write_packet;

  409.     ts->sdt.opaque = s;

  410. 

  411.     /* assign pids to each stream */

  412.     total_bit_rate = 0;

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

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

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

  416.         if (!ts_st)

  417.             goto fail;

  418.         st->priv_data = ts_st;

  419.         ts_st->service = service;

  420.         ts_st->pid = DEFAULT_START_PID + i;

  421.         ts_st->payload_pts = AV_NOPTS_VALUE;

  422.         ts_st->payload_dts = AV_NOPTS_VALUE;

  423.         ts_st->first_pts_check = 1;

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

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

  426.             service->pcr_pid == 0x1fff)

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

  428.         if (st->codec->rc_max_rate)

  429.             total_bit_rate += st->codec->rc_max_rate;

  430.         else {

  431.             if (!st->codec->bit_rate) {

  432.                 av_log(s, AV_LOG_WARNING,

  433.                        "stream %d, bit rate is not set, this will cause problems\n",

  434.                        st->index);

  435.             }

  436.             total_bit_rate += st->codec->bit_rate;

  437.         }

  438.         /* PES header size */

  439.         if (st->codec->codec_type == CODEC_TYPE_VIDEO ||

  440.             st->codec->codec_type == CODEC_TYPE_SUBTITLE) {

  441.             /* 1 PES per frame

  442.              * 19 bytes of PES header

  443.              * on average a half TS-packet (184/2) of padding-overhead every PES */

  444.             total_bit_rate += (19 + 184/2)*8 / av_q2d(st->codec->time_base);

  445.         } else {

  446.             /* 1 PES per DEFAULT_PES_PAYLOAD_SIZE bytes of audio data

  447.              * 14 bytes of PES header

  448.              * on average a half TS-packet (184/2) of padding-overhead every PES */

  449.             total_bit_rate += (14 + 184/2) *

  450.                 st->codec->bit_rate / DEFAULT_PES_PAYLOAD_SIZE;

  451.         }

  452.     }

  453. 

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

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

  456.         ts_st = s->streams[0]->priv_data;

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

  458.     }

  459. 

  460.     ts->mux_rate = 1; // avoid div by 0

  461. 

  462.     /* write info at the start of the file, so that it will be fast to

  463.        find them */

  464.     pos = url_ftell(s->pb);

  465.     mpegts_write_sdt(s);

  466.     sdt_size = url_ftell(s->pb) - pos;

  467.     pos = url_ftell(s->pb);

  468.     mpegts_write_pat(s);

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

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

  471.     }

  472.     pat_pmt_size = url_ftell(s->pb) - pos;

  473. 

  474.     if (total_bit_rate <= 8 * 1024)

  475.         total_bit_rate = 8 * 1024;

  476. 

  477.     total_bit_rate +=

  478.         total_bit_rate * 4 / (TS_PACKET_SIZE-4)        + /* TS header size */

  479.         1000 * 8 * sdt_size     / PAT_RETRANS_TIME     + /* SDT size */

  480.         1000 * 8 * pat_pmt_size / SDT_RETRANS_TIME     + /* PAT+PMT size */

  481.         1000 * 8 * 8            / PCR_RETRANS_TIME;      /* PCR size */

  482. 

  483.     if (s->mux_rate)

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

  485.     else

  486.         ts->mux_rate = total_bit_rate;

  487. 

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

  489.         (TS_PACKET_SIZE * 8 * 1000);

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

  491.         (TS_PACKET_SIZE * 8 * 1000);

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

  493.         (TS_PACKET_SIZE * 8 * 1000);

  494. 

  495.     // output a PCR as soon as possible

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

  497. 

  498.     av_log(s, AV_LOG_DEBUG,

  499.            "calculated bitrate %d bps, muxrate %d bps, "

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

  501.            total_bit_rate, ts->mux_rate, ts->sdt_packet_period,

  502.            ts->pat_packet_period);

  503. 

  504.     // adjust pcr

  505.     ts->cur_pcr /= ts->mux_rate;

  506. 

  507.     put_flush_packet(s->pb);

  508. 

  509.     return 0;

  510. 

  511.  fail:

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

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

  514.         av_free(st->priv_data);

  515.     }

  516.     return -1;

  517. }

  518. 

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

  520. static void retransmit_si_info(AVFormatContext *s)

  521. {

  522.     MpegTSWrite *ts = s->priv_data;

  523.     int i;

  524. 

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

  526.         ts->sdt_packet_count = 0;

  527.         mpegts_write_sdt(s);

  528.     }

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

  530.         ts->pat_packet_count = 0;

  531.         mpegts_write_pat(s);

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

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

  534.         }

  535.     }

  536. }

  537. 

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

  539. static void mpegts_insert_null_packet(AVFormatContext *s)

  540. {

  541.     MpegTSWrite *ts = s->priv_data;

  542.     uint8_t *q;

  543.     uint8_t buf[TS_PACKET_SIZE];

  544. 

  545.     q = buf;

  546.     *q++ = 0x47;

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

  548.     *q++ = 0xff;

  549.     *q++ = 0x10;

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

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

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

  553. }

  554. 

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

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

  557. {

  558.     MpegTSWrite *ts = s->priv_data;

  559.     MpegTSWriteStream *ts_st = st->priv_data;

  560.     uint8_t *q;

  561.     uint64_t pcr = ts->cur_pcr;

  562.     uint8_t buf[TS_PACKET_SIZE];

  563. 

  564.     q = buf;

  565.     *q++ = 0x47;

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

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

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

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

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

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

  572. 

  573.     /* PCR coded into 6 bytes */

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

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

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

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

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

  579.     *q++ = 0;

  580. 

  581.     /* stuffing bytes */

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

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

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

  585. }

  586. 

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

  588. {

  589.     int val;

  590. 

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

  592.     *q++ = val;

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

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

  595.     *q++ = val;

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

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

  598.     *q++ = val;

  599. }

  600. 

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

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

  603.  * to exactly fill the last ts packet.

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

  605.  */

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

  607.                              const uint8_t *payload, int payload_size,

  608.                              int64_t pts, int64_t dts)

  609. {

  610.     MpegTSWriteStream *ts_st = st->priv_data;

  611.     MpegTSWrite *ts = s->priv_data;

  612.     uint8_t buf[TS_PACKET_SIZE];

  613.     uint8_t *q;

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

  615.     int afc_len, stuffing_len;

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

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

  618. 

  619.     is_start = 1;

  620.     while (payload_size > 0) {

  621.         retransmit_si_info(s);

  622. 

  623.         write_pcr = 0;

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

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

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

  627.                 ts_st->service->pcr_packet_period) {

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

  629.                 write_pcr = 1;

  630.             }

  631.         }

  632. 

  633.         if (dts != AV_NOPTS_VALUE && (dts - (int64_t)ts->cur_pcr) > delay) {

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

  635.             if (write_pcr)

  636.                 mpegts_insert_pcr_only(s, st);

  637.             else

  638.                 mpegts_insert_null_packet(s);

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

  640.         }

  641. 

  642.         /* prepare packet header */

  643.         q = buf;

  644.         *q++ = 0x47;

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

  646.         if (is_start)

  647.             val |= 0x40;

  648.         *q++ = val;

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

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

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

  652.         if (write_pcr) {

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

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

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

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

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

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

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

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

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

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

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

  664.             *q++ = 0;

  665.         }

  666.         if (is_start) {

  667.             int pes_extension = 0;

  668.             /* write PES header */

  669.             *q++ = 0x00;

  670.             *q++ = 0x00;

  671.             *q++ = 0x01;

  672.             private_code = 0;

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

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

  675.                     *q++ = 0xfd;

  676.                 } else

  677.                     *q++ = 0xe0;

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

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

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

  681.                 *q++ = 0xc0;

  682.             } else {

  683.                 *q++ = 0xbd;

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

  685.                     private_code = 0x20;

  686.                 }

  687.             }

  688.             header_len = 0;

  689.             flags = 0;

  690.             if (pts != AV_NOPTS_VALUE) {

  691.                 header_len += 5;

  692.                 flags |= 0x80;

  693.             }

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

  695.                 header_len += 5;

  696.                 flags |= 0x40;

  697.             }

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

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

  700.                 /* set PES_extension_flag */

  701.                 pes_extension = 1;

  702.                 flags |= 0x01;

  703. 

  704.                 /*

  705.                 * One byte for PES2 extension flag +

  706.                 * one byte for extension length +

  707.                 * one byte for extension id

  708.                 */

  709.                 header_len += 3;

  710.             }

  711.             len = payload_size + header_len + 3;

  712.             if (private_code != 0)

  713.                 len++;

  714.             if (len > 0xffff)

  715.                 len = 0;

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

  717.             *q++ = len;

  718.             val = 0x80;

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

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

  721.                 val |= 0x04;

  722.             *q++ = val;

  723.             *q++ = flags;

  724.             *q++ = header_len;

  725.             if (pts != AV_NOPTS_VALUE) {

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

  727.                 q += 5;

  728.             }

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

  730.                 write_pts(q, 1, dts);

  731.                 q += 5;

  732.             }

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

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

  735.                 *q++ = flags;

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

  737.                 /*

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

  739.                 * write the extended stream id

  740.                 */

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

  742.             }

  743.             if (private_code != 0)

  744.                 *q++ = private_code;

  745.             is_start = 0;

  746.         }

  747.         /* header size */

  748.         header_len = q - buf;

  749.         /* data len */

  750.         len = TS_PACKET_SIZE - header_len;

  751.         if (len > payload_size)

  752.             len = payload_size;

  753.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  754.         if (stuffing_len > 0) {

  755.             /* add stuffing with AFC */

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

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

  758.                 afc_len = buf[4] + 1;

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

  760.                         buf + 4 + afc_len,

  761.                         header_len - (4 + afc_len));

  762.                 buf[4] += stuffing_len;

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

  764.             } else {

  765.                 /* add stuffing */

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

  767.                 buf[3] |= 0x20;

  768.                 buf[4] = stuffing_len - 1;

  769.                 if (stuffing_len >= 2) {

  770.                     buf[5] = 0x00;

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

  772.                 }

  773.             }

  774.         }

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

  776.         payload += len;

  777.         payload_size -= len;

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

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

  780.     }

  781.     put_flush_packet(s->pb);

  782. }

  783. 

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

  785. {

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

  787.     int size = pkt->size;

  788.     uint8_t *buf= pkt->data;

  789.     uint8_t *data= NULL;

  790.     MpegTSWriteStream *ts_st = st->priv_data;

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

  792.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  793. 

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

  795.         pts = pkt->pts + delay;

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

  797.         dts = pkt->dts + delay;

  798. 

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

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

  801.         return -1;

  802.     }

  803.     ts_st->first_pts_check = 0;

  804. 

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

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

  807.             av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n");

  808.             return -1;

  809.         }

  810.         if (pkt->data[4] != 0x09) { // AUD NAL

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

  812.             if (!data)

  813.                 return -1;

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

  815.             AV_WB32(data, 0x00000001);

  816.             data[4] = 0x09;

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

  818.             buf  = data;

  819.             size = pkt->size+6;

  820.         }

  821.     }

  822. 

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

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

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

  826.         av_free(data);

  827.         return 0;

  828.     }

  829. 

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

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

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

  833.         ts_st->payload_index = 0;

  834.     }

  835. 

  836.     if (!ts_st->payload_index) {

  837.         ts_st->payload_pts = pts;

  838.         ts_st->payload_dts = dts;

  839.     }

  840. 

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

  842.     ts_st->payload_index += size;

  843. 

  844.     return 0;

  845. }

  846. 

  847. static int mpegts_write_end(AVFormatContext *s)

  848. {

  849.     MpegTSWrite *ts = s->priv_data;

  850.     MpegTSWriteStream *ts_st;

  851.     MpegTSService *service;

  852.     AVStream *st;

  853.     int i;

  854. 

  855.     /* flush current packets */

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

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

  858.         ts_st = st->priv_data;

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

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

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

  862.         }

  863.     }

  864.     put_flush_packet(s->pb);

  865. 

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

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

  868.         av_freep(&service->provider_name);

  869.         av_freep(&service->name);

  870.         av_free(service);

  871.     }

  872.     av_free(ts->services);

  873. 

  874.     return 0;

  875. }

  876. 

  877. AVOutputFormat mpegts_muxer = {

  878.     "mpegts",

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

  880.     "video/x-mpegts",

  881.     "ts,m2t",

  882.     sizeof(MpegTSWrite),

  883.     CODEC_ID_MP2,

  884.     CODEC_ID_MPEG2VIDEO,

  885.     mpegts_write_header,

  886.     mpegts_write_packet,

  887.     mpegts_write_end,

  888. };