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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_freq;

  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_freq;

  56.     int pat_packet_count;

  57.     int pat_packet_freq;

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

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

  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 = 0;

  403.     ts->pat.write_packet = section_write_packet;

  404.     ts->pat.opaque = s;

  405. 

  406.     ts->sdt.pid = SDT_PID;

  407.     ts->sdt.cc = 0;

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

  429.         /* PES header size */

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

  431.             st->codec->codec_type == CODEC_TYPE_SUBTITLE)

  432.             total_bit_rate += 25 * 8 / av_q2d(st->codec->time_base);

  433.         else

  434.             total_bit_rate += total_bit_rate * 25 / DEFAULT_PES_PAYLOAD_SIZE;

  435.     }

  436. 

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

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

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

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

  441.     }

  442. 

  443.     if (total_bit_rate <= 8 * 1024)

  444.         total_bit_rate = 8 * 1024;

  445.     service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /

  446.         (TS_PACKET_SIZE * 8 * 1000);

  447.     ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /

  448.         (TS_PACKET_SIZE * 8 * 1000);

  449.     ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /

  450.         (TS_PACKET_SIZE * 8 * 1000);

  451. 

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

  453. 

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

  455.        find them */

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

  457.     mpegts_write_sdt(s);

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

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

  460.     mpegts_write_pat(s);

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

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

  463.     }

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

  465. 

  466.     total_bit_rate +=

  467.         total_bit_rate *  4 / TS_PACKET_SIZE           + /* TS  header size */

  468.         SDT_RETRANS_TIME * 8 * sdt_size     / 1000     + /* SDT size */

  469.         PAT_RETRANS_TIME * 8 * pat_pmt_size / 1000     + /* PAT+PMT size */

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

  471. 

  472.     av_log(s, AV_LOG_DEBUG, "muxrate %d freq sdt %d pat %d\n",

  473.            total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);

  474. 

  475.     if (s->mux_rate)

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

  477.     else

  478.         ts->mux_rate = total_bit_rate;

  479. 

  480.     // adjust pcr

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

  482. 

  483.     put_flush_packet(s->pb);

  484. 

  485.     return 0;

  486. 

  487.  fail:

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

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

  490.         av_free(st->priv_data);

  491.     }

  492.     return -1;

  493. }

  494. 

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

  496. static void retransmit_si_info(AVFormatContext *s)

  497. {

  498.     MpegTSWrite *ts = s->priv_data;

  499.     int i;

  500. 

  501.     if (++ts->sdt_packet_count == ts->sdt_packet_freq) {

  502.         ts->sdt_packet_count = 0;

  503.         mpegts_write_sdt(s);

  504.     }

  505.     if (++ts->pat_packet_count == ts->pat_packet_freq) {

  506.         ts->pat_packet_count = 0;

  507.         mpegts_write_pat(s);

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

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

  510.         }

  511.     }

  512. }

  513. 

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

  515. {

  516.     int val;

  517. 

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

  519.     *q++ = val;

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

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

  522.     *q++ = val;

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

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

  525.     *q++ = val;

  526. }

  527. 

  528. /* NOTE: pes_data contains all the PES packet */

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

  530.                              const uint8_t *payload, int payload_size,

  531.                              int64_t pts, int64_t dts)

  532. {

  533.     MpegTSWriteStream *ts_st = st->priv_data;

  534.     MpegTSWrite *ts = s->priv_data;

  535.     uint8_t buf[TS_PACKET_SIZE];

  536.     uint8_t *q;

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

  538.     int afc_len, stuffing_len;

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

  540. 

  541.     is_start = 1;

  542.     while (payload_size > 0) {

  543.         retransmit_si_info(s);

  544. 

  545.         write_pcr = 0;

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

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

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

  549.                 ts_st->service->pcr_packet_freq) {

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

  551.                 write_pcr = 1;

  552.             }

  553.         }

  554. 

  555.         /* prepare packet header */

  556.         q = buf;

  557.         *q++ = 0x47;

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

  559.         if (is_start)

  560.             val |= 0x40;

  561.         *q++ = val;

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

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

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

  565.         if (write_pcr) {

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

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

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

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

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

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

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

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

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

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

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

  577.             *q++ = 0;

  578.         }

  579.         if (is_start) {

  580.             int pes_extension = 0;

  581.             /* write PES header */

  582.             *q++ = 0x00;

  583.             *q++ = 0x00;

  584.             *q++ = 0x01;

  585.             private_code = 0;

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

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

  588.                     *q++ = 0xfd;

  589.                 } else

  590.                     *q++ = 0xe0;

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

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

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

  594.                 *q++ = 0xc0;

  595.             } else {

  596.                 *q++ = 0xbd;

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

  598.                     private_code = 0x20;

  599.                 }

  600.             }

  601.             header_len = 0;

  602.             flags = 0;

  603.             if (pts != AV_NOPTS_VALUE) {

  604.                 header_len += 5;

  605.                 flags |= 0x80;

  606.             }

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

  608.                 header_len += 5;

  609.                 flags |= 0x40;

  610.             }

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

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

  613.                 /* set PES_extension_flag */

  614.                 pes_extension = 1;

  615.                 flags |= 0x01;

  616. 

  617.                 /*

  618.                 * One byte for PES2 extension flag +

  619.                 * one byte for extension length +

  620.                 * one byte for extension id

  621.                 */

  622.                 header_len += 3;

  623.             }

  624.             len = payload_size + header_len + 3;

  625.             if (private_code != 0)

  626.                 len++;

  627.             if (len > 0xffff)

  628.                 len = 0;

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

  630.             *q++ = len;

  631.             val = 0x80;

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

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

  634.                 val |= 0x04;

  635.             *q++ = val;

  636.             *q++ = flags;

  637.             *q++ = header_len;

  638.             if (pts != AV_NOPTS_VALUE) {

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

  640.                 q += 5;

  641.             }

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

  643.                 write_pts(q, 1, dts);

  644.                 q += 5;

  645.             }

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

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

  648.                 *q++ = flags;

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

  650.                 /*

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

  652.                 * write the extended stream id

  653.                 */

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

  655.             }

  656.             if (private_code != 0)

  657.                 *q++ = private_code;

  658.             is_start = 0;

  659.         }

  660.         /* header size */

  661.         header_len = q - buf;

  662.         /* data len */

  663.         len = TS_PACKET_SIZE - header_len;

  664.         if (len > payload_size)

  665.             len = payload_size;

  666.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  667.         if (stuffing_len > 0) {

  668.             /* add stuffing with AFC */

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

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

  671.                 afc_len = buf[4] + 1;

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

  673.                         buf + 4 + afc_len,

  674.                         header_len - (4 + afc_len));

  675.                 buf[4] += stuffing_len;

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

  677.             } else {

  678.                 /* add stuffing */

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

  680.                 buf[3] |= 0x20;

  681.                 buf[4] = stuffing_len - 1;

  682.                 if (stuffing_len >= 2) {

  683.                     buf[5] = 0x00;

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

  685.                 }

  686.             }

  687.         }

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

  689.         payload += len;

  690.         payload_size -= len;

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

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

  693.     }

  694.     put_flush_packet(s->pb);

  695. }

  696. 

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

  698. {

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

  700.     int len, size = pkt->size;

  701.     uint8_t *buf= pkt->data;

  702.     uint8_t *data= NULL;

  703.     MpegTSWriteStream *ts_st = st->priv_data;

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

  705.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  706. 

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

  708.         pts = pkt->pts + delay;

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

  710.         dts = pkt->dts + delay;

  711. 

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

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

  714.         return -1;

  715.     }

  716.     ts_st->first_pts_check = 0;

  717. 

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

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

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

  721.             return -1;

  722.         }

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

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

  725.             if (!data)

  726.                 return -1;

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

  728.             AV_WB32(data, 0x00000001);

  729.             data[4] = 0x09;

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

  731.             buf  = data;

  732.             size = pkt->size+6;

  733.         }

  734.     }

  735. 

  736.     if (st->codec->codec_type == CODEC_TYPE_SUBTITLE ||

  737.         st->codec->codec_type == CODEC_TYPE_VIDEO) {

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

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

  740.         av_free(data);

  741.         return 0;

  742.     }

  743. 

  744.     if (ts_st->payload_pts == AV_NOPTS_VALUE) {

  745.         ts_st->payload_dts = dts;

  746.         ts_st->payload_pts = pts;

  747.     }

  748. 

  749.     // audio

  750.     while (size > 0) {

  751.         len = DEFAULT_PES_PAYLOAD_SIZE - ts_st->payload_index;

  752.         if (len > size)

  753.             len = size;

  754.         memcpy(ts_st->payload + ts_st->payload_index, buf, len);

  755.         buf += len;

  756.         size -= len;

  757.         ts_st->payload_index += len;

  758.         if (ts_st->payload_index >= DEFAULT_PES_PAYLOAD_SIZE) {

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

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

  761.             ts_st->payload_pts = AV_NOPTS_VALUE;

  762.             ts_st->payload_dts = AV_NOPTS_VALUE;

  763.             ts_st->payload_index = 0;

  764.         }

  765.     }

  766. 

  767.     return 0;

  768. }

  769. 

  770. static int mpegts_write_end(AVFormatContext *s)

  771. {

  772.     MpegTSWrite *ts = s->priv_data;

  773.     MpegTSWriteStream *ts_st;

  774.     MpegTSService *service;

  775.     AVStream *st;

  776.     int i;

  777. 

  778.     /* flush current packets */

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

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

  781.         ts_st = st->priv_data;

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

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

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

  785.         }

  786.     }

  787.     put_flush_packet(s->pb);

  788. 

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

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

  791.         av_freep(&service->provider_name);

  792.         av_freep(&service->name);

  793.         av_free(service);

  794.     }

  795.     av_free(ts->services);

  796. 

  797.     return 0;

  798. }

  799. 

  800. AVOutputFormat mpegts_muxer = {

  801.     "mpegts",

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

  803.     "video/x-mpegts",

  804.     "ts,m2t",

  805.     sizeof(MpegTSWrite),

  806.     CODEC_ID_MP2,

  807.     CODEC_ID_MPEG2VIDEO,

  808.     mpegts_write_header,

  809.     mpegts_write_packet,

  810.     mpegts_write_end,

  811. };