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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. #define PCR_TIME_BASE 27000000

  31. 

  32. /* write DVB SI sections */

  33. 

  34. /*********************************************/

  35. /* mpegts section writer */

  36. 

  37. typedef struct MpegTSSection {

  38.     int pid;

  39.     int cc;

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

  41.     void *opaque;

  42. } MpegTSSection;

  43. 

  44. typedef struct MpegTSService {

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

  46.     int sid;           /* service ID */

  47.     char *name;

  48.     char *provider_name;

  49.     int pcr_pid;

  50.     int pcr_packet_count;

  51.     int pcr_packet_period;

  52. } MpegTSService;

  53. 

  54. typedef struct MpegTSWrite {

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

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

  57.     MpegTSService **services;

  58.     int sdt_packet_count;

  59.     int sdt_packet_period;

  60.     int pat_packet_count;

  61.     int pat_packet_period;

  62.     int nb_services;

  63.     int onid;

  64.     int tsid;

  65.     int64_t first_pcr;

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

  67. } MpegTSWrite;

  68. 

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

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

  71. {

  72.     unsigned int crc;

  73.     unsigned char packet[TS_PACKET_SIZE];

  74.     const unsigned char *buf_ptr;

  75.     unsigned char *q;

  76.     int first, b, len1, left;

  77. 

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

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

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

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

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

  83. 

  84.     /* send each packet */

  85.     buf_ptr = buf;

  86.     while (len > 0) {

  87.         first = (buf == buf_ptr);

  88.         q = packet;

  89.         *q++ = 0x47;

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

  91.         if (first)

  92.             b |= 0x40;

  93.         *q++ = b;

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

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

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

  97.         if (first)

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

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

  100.         if (len1 > len)

  101.             len1 = len;

  102.         memcpy(q, buf_ptr, len1);

  103.         q += len1;

  104.         /* add known padding data */

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

  106.         if (left > 0)

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

  108. 

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

  110. 

  111.         buf_ptr += len1;

  112.         len -= len1;

  113.     }

  114. }

  115. 

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

  117. {

  118.     uint8_t *q;

  119.     q = *q_ptr;

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

  121.     *q++ = val;

  122.     *q_ptr = q;

  123. }

  124. 

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

  126.                           int version, int sec_num, int last_sec_num,

  127.                           uint8_t *buf, int len)

  128. {

  129.     uint8_t section[1024], *q;

  130.     unsigned int tot_len;

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

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

  133. 

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

  135.     /* check if not too big */

  136.     if (tot_len > 1024)

  137.         return -1;

  138. 

  139.     q = section;

  140.     *q++ = tid;

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

  142.     put16(&q, id);

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

  144.     *q++ = sec_num;

  145.     *q++ = last_sec_num;

  146.     memcpy(q, buf, len);

  147. 

  148.     mpegts_write_section(s, section, tot_len);

  149.     return 0;

  150. }

  151. 

  152. /*********************************************/

  153. /* mpegts writer */

  154. 

  155. #define DEFAULT_PMT_START_PID   0x1000

  156. #define DEFAULT_START_PID       0x0100

  157. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  158. #define DEFAULT_SERVICE_NAME    "Service01"

  159. 

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

  161. #define DEFAULT_ONID            0x0001

  162. #define DEFAULT_TSID            0x0001

  163. #define DEFAULT_SID             0x0001

  164. 

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

  166. #define DEFAULT_PES_HEADER_FREQ 16

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

  168. 

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

  170. #define SDT_RETRANS_TIME 500

  171. #define PAT_RETRANS_TIME 100

  172. #define PCR_RETRANS_TIME 20

  173. 

  174. typedef struct MpegTSWriteStream {

  175.     struct MpegTSService *service;

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

  177.     int cc;

  178.     int payload_index;

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

  180.     int64_t payload_pts;

  181.     int64_t payload_dts;

  182.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  183.     ADTSContext *adts;

  184. } MpegTSWriteStream;

  185. 

  186. static void mpegts_write_pat(AVFormatContext *s)

  187. {

  188.     MpegTSWrite *ts = s->priv_data;

  189.     MpegTSService *service;

  190.     uint8_t data[1012], *q;

  191.     int i;

  192. 

  193.     q = data;

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

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

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

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

  198.     }

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

  200.                           data, q - data);

  201. }

  202. 

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

  204. {

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

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

  207.     int val, stream_type, i;

  208. 

  209.     q = data;

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

  211. 

  212.     program_info_length_ptr = q;

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

  214. 

  215.     /* put program info here */

  216. 

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

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

  219.     program_info_length_ptr[1] = val;

  220. 

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

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

  223.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  226.         case CODEC_ID_MPEG1VIDEO:

  227.         case CODEC_ID_MPEG2VIDEO:

  228.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  229.             break;

  230.         case CODEC_ID_MPEG4:

  231.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  232.             break;

  233.         case CODEC_ID_H264:

  234.             stream_type = STREAM_TYPE_VIDEO_H264;

  235.             break;

  236.         case CODEC_ID_DIRAC:

  237.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  238.             break;

  239.         case CODEC_ID_MP2:

  240.         case CODEC_ID_MP3:

  241.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  242.             break;

  243.         case CODEC_ID_AAC:

  244.             stream_type = STREAM_TYPE_AUDIO_AAC;

  245.             break;

  246.         case CODEC_ID_AAC_LATM:

  247.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  248.             break;

  249.         case CODEC_ID_AC3:

  250.             stream_type = STREAM_TYPE_AUDIO_AC3;

  251.             break;

  252.         default:

  253.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  254.             break;

  255.         }

  256.         *q++ = stream_type;

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

  258.         desc_length_ptr = q;

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

  260. 

  261.         /* write optional descriptors here */

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

  263.         case AVMEDIA_TYPE_AUDIO:

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

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

  266.                 *q++ = 4;

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

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

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

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

  271.             }

  272.             break;

  273.         case AVMEDIA_TYPE_SUBTITLE:

  274.             {

  275.                 const char *language;

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

  277.                 *q++ = 0x59;

  278.                 *q++ = 8;

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

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

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

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

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

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

  285.                     q += 4;

  286.                 } else {

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

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

  289.                 }

  290.             }

  291.             break;

  292.         case AVMEDIA_TYPE_VIDEO:

  293.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  295.                 *q++ = 4;

  296.                 *q++ = 'd';

  297.                 *q++ = 'r';

  298.                 *q++ = 'a';

  299.                 *q++ = 'c';

  300.             }

  301.             break;

  302.         }

  303. 

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

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

  306.         desc_length_ptr[1] = val;

  307.     }

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

  309.                           data, q - data);

  310. }

  311. 

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

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

  314. {

  315.     uint8_t *q;

  316.     int len;

  317. 

  318.     q = *q_ptr;

  319.     if (!str)

  320.         len = 0;

  321.     else

  322.         len = strlen(str);

  323.     *q++ = len;

  324.     memcpy(q, str, len);

  325.     q += len;

  326.     *q_ptr = q;

  327. }

  328. 

  329. static void mpegts_write_sdt(AVFormatContext *s)

  330. {

  331.     MpegTSWrite *ts = s->priv_data;

  332.     MpegTSService *service;

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

  334.     int i, running_status, free_ca_mode, val;

  335. 

  336.     q = data;

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

  338.     *q++ = 0xff;

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

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

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

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

  343.         desc_list_len_ptr = q;

  344.         q += 2;

  345.         running_status = 4; /* running */

  346.         free_ca_mode = 0;

  347. 

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

  349.         *q++ = 0x48;

  350.         desc_len_ptr = q;

  351.         q++;

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

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

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

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

  356. 

  357.         /* fill descriptor length */

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

  359.             (q - desc_list_len_ptr - 2);

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

  361.         desc_list_len_ptr[1] = val;

  362.     }

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

  364.                           data, q - data);

  365. }

  366. 

  367. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  368.                                          int sid,

  369.                                          const char *provider_name,

  370.                                          const char *name)

  371. {

  372.     MpegTSService *service;

  373. 

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

  375.     if (!service)

  376.         return NULL;

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

  378.     service->sid = sid;

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

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

  381.     service->pcr_pid = 0x1fff;

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

  383.     return service;

  384. }

  385. 

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

  387. {

  388.     AVFormatContext *ctx = s->opaque;

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

  390. }

  391. 

  392. static int mpegts_write_header(AVFormatContext *s)

  393. {

  394.     MpegTSWrite *ts = s->priv_data;

  395.     MpegTSWriteStream *ts_st;

  396.     MpegTSService *service;

  397.     AVStream *st, *pcr_st = NULL;

  398.     AVMetadataTag *title, *provider;

  399.     int i, j;

  400.     const char *service_name;

  401.     const char *provider_name;

  402.     int *pids;

  403. 

  404.     ts->tsid = DEFAULT_TSID;

  405.     ts->onid = DEFAULT_ONID;

  406.     /* allocate a single DVB service */

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

  408.     if (!title)

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

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

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

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

  413.     service = mpegts_add_service(ts, DEFAULT_SID, provider_name, service_name);

  414.     service->pmt.write_packet = section_write_packet;

  415.     service->pmt.opaque = s;

  416.     service->pmt.cc = 15;

  417. 

  418.     ts->pat.pid = PAT_PID;

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

  420.     ts->pat.write_packet = section_write_packet;

  421.     ts->pat.opaque = s;

  422. 

  423.     ts->sdt.pid = SDT_PID;

  424.     ts->sdt.cc = 15;

  425.     ts->sdt.write_packet = section_write_packet;

  426.     ts->sdt.opaque = s;

  427. 

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

  429.     if (!pids)

  430.         return AVERROR(ENOMEM);

  431. 

  432.     /* assign pids to each stream */

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

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

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

  436.         if (!ts_st)

  437.             goto fail;

  438.         st->priv_data = ts_st;

  439.         ts_st->service = service;

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

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

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

  443.             ts_st->pid = DEFAULT_START_PID + i;

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

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

  446.         } else {

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

  448.             goto fail;

  449.         }

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

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

  452.             goto fail;

  453.         }

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

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

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

  457.                 goto fail;

  458.             }

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

  460.         ts_st->payload_pts = AV_NOPTS_VALUE;

  461.         ts_st->payload_dts = AV_NOPTS_VALUE;

  462.         ts_st->first_pts_check = 1;

  463.         ts_st->cc = 15;

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

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

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

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

  468.             pcr_st = st;

  469.         }

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

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

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

  473.             if (!ts_st->adts)

  474.                 return AVERROR(ENOMEM);

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

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

  477.                 return -1;

  478.         }

  479.     }

  480. 

  481.     av_free(pids);

  482. 

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

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

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

  486.         ts_st = pcr_st->priv_data;

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

  488.     }

  489. 

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

  491. 

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

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

  494.             (TS_PACKET_SIZE * 8 * 1000);

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

  496.             (TS_PACKET_SIZE * 8 * 1000);

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

  498.             (TS_PACKET_SIZE * 8 * 1000);

  499. 

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

  501.     } else {

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

  503.         ts->sdt_packet_period = 200;

  504.         ts->pat_packet_period = 40;

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

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

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

  508.                 service->pcr_packet_period =

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

  510.             } else {

  511.                 service->pcr_packet_period =

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

  513.             }

  514.         } else {

  515.             // max delta PCR 0.1s

  516.             service->pcr_packet_period =

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

  518.         }

  519.     }

  520. 

  521.     // output a PCR as soon as possible

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

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

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

  525. 

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

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

  528.     else

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

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

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

  532.            service->pcr_packet_period,

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

  534. 

  535.     put_flush_packet(s->pb);

  536. 

  537.     return 0;

  538. 

  539.  fail:

  540.     av_free(pids);

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

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

  543.         av_free(st->priv_data);

  544.     }

  545.     return -1;

  546. }

  547. 

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

  549. static void retransmit_si_info(AVFormatContext *s)

  550. {

  551.     MpegTSWrite *ts = s->priv_data;

  552.     int i;

  553. 

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

  555.         ts->sdt_packet_count = 0;

  556.         mpegts_write_sdt(s);

  557.     }

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

  559.         ts->pat_packet_count = 0;

  560.         mpegts_write_pat(s);

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

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

  563.         }

  564.     }

  565. }

  566. 

  567. static int64_t get_pcr(const MpegTSWrite *ts, ByteIOContext *pb)

  568. {

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

  570.            ts->first_pcr;

  571. }

  572. 

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

  574. {

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

  576. 

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

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

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

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

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

  582.     *buf++ = pcr_low;

  583. 

  584.     return buf;

  585. }

  586. 

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

  588. static void mpegts_insert_null_packet(AVFormatContext *s)

  589. {

  590.     uint8_t *q;

  591.     uint8_t buf[TS_PACKET_SIZE];

  592. 

  593.     q = buf;

  594.     *q++ = 0x47;

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

  596.     *q++ = 0xff;

  597.     *q++ = 0x10;

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

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

  600. }

  601. 

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

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

  604. {

  605.     MpegTSWrite *ts = s->priv_data;

  606.     MpegTSWriteStream *ts_st = st->priv_data;

  607.     uint8_t *q;

  608.     uint8_t buf[TS_PACKET_SIZE];

  609. 

  610.     q = buf;

  611.     *q++ = 0x47;

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

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

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

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

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

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

  618. 

  619.     /* PCR coded into 6 bytes */

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

  621. 

  622.     /* stuffing bytes */

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

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

  625. }

  626. 

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

  628. {

  629.     int val;

  630. 

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

  632.     *q++ = val;

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

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

  635.     *q++ = val;

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

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

  638.     *q++ = val;

  639. }

  640. 

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

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

  643.  * to exactly fill the last ts packet.

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

  645.  */

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

  647.                              const uint8_t *payload, int payload_size,

  648.                              int64_t pts, int64_t dts)

  649. {

  650.     MpegTSWriteStream *ts_st = st->priv_data;

  651.     MpegTSWrite *ts = s->priv_data;

  652.     uint8_t buf[TS_PACKET_SIZE];

  653.     uint8_t *q;

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

  655.     int afc_len, stuffing_len;

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

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

  658. 

  659.     is_start = 1;

  660.     while (payload_size > 0) {

  661.         retransmit_si_info(s);

  662. 

  663.         write_pcr = 0;

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

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

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

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

  668.                 ts_st->service->pcr_packet_period) {

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

  670.                 write_pcr = 1;

  671.             }

  672.         }

  673. 

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

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

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

  677.             if (write_pcr)

  678.                 mpegts_insert_pcr_only(s, st);

  679.             else

  680.                 mpegts_insert_null_packet(s);

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

  682.         }

  683. 

  684.         /* prepare packet header */

  685.         q = buf;

  686.         *q++ = 0x47;

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

  688.         if (is_start)

  689.             val |= 0x40;

  690.         *q++ = val;

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

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

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

  694.         if (write_pcr) {

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

  696.             if (ts->mux_rate > 1)

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

  698.             else

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

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

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

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

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

  704.             q = write_pcr_bits(q, pcr);

  705.         }

  706.         if (is_start) {

  707.             int pes_extension = 0;

  708.             /* write PES header */

  709.             *q++ = 0x00;

  710.             *q++ = 0x00;

  711.             *q++ = 0x01;

  712.             private_code = 0;

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

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

  715.                     *q++ = 0xfd;

  716.                 } else

  717.                     *q++ = 0xe0;

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

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

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

  721.                 *q++ = 0xc0;

  722.             } else {

  723.                 *q++ = 0xbd;

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

  725.                     private_code = 0x20;

  726.                 }

  727.             }

  728.             header_len = 0;

  729.             flags = 0;

  730.             if (pts != AV_NOPTS_VALUE) {

  731.                 header_len += 5;

  732.                 flags |= 0x80;

  733.             }

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

  735.                 header_len += 5;

  736.                 flags |= 0x40;

  737.             }

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

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

  740.                 /* set PES_extension_flag */

  741.                 pes_extension = 1;

  742.                 flags |= 0x01;

  743. 

  744.                 /*

  745.                 * One byte for PES2 extension flag +

  746.                 * one byte for extension length +

  747.                 * one byte for extension id

  748.                 */

  749.                 header_len += 3;

  750.             }

  751.             len = payload_size + header_len + 3;

  752.             if (private_code != 0)

  753.                 len++;

  754.             if (len > 0xffff)

  755.                 len = 0;

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

  757.             *q++ = len;

  758.             val = 0x80;

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

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

  761.                 val |= 0x04;

  762.             *q++ = val;

  763.             *q++ = flags;

  764.             *q++ = header_len;

  765.             if (pts != AV_NOPTS_VALUE) {

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

  767.                 q += 5;

  768.             }

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

  770.                 write_pts(q, 1, dts);

  771.                 q += 5;

  772.             }

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

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

  775.                 *q++ = flags;

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

  777.                 /*

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

  779.                 * write the extended stream id

  780.                 */

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

  782.             }

  783.             if (private_code != 0)

  784.                 *q++ = private_code;

  785.             is_start = 0;

  786.         }

  787.         /* header size */

  788.         header_len = q - buf;

  789.         /* data len */

  790.         len = TS_PACKET_SIZE - header_len;

  791.         if (len > payload_size)

  792.             len = payload_size;

  793.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  794.         if (stuffing_len > 0) {

  795.             /* add stuffing with AFC */

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

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

  798.                 afc_len = buf[4] + 1;

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

  800.                         buf + 4 + afc_len,

  801.                         header_len - (4 + afc_len));

  802.                 buf[4] += stuffing_len;

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

  804.             } else {

  805.                 /* add stuffing */

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

  807.                 buf[3] |= 0x20;

  808.                 buf[4] = stuffing_len - 1;

  809.                 if (stuffing_len >= 2) {

  810.                     buf[5] = 0x00;

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

  812.                 }

  813.             }

  814.         }

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

  816.         payload += len;

  817.         payload_size -= len;

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

  819.     }

  820.     put_flush_packet(s->pb);

  821. }

  822. 

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

  824. {

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

  826.     int size = pkt->size;

  827.     uint8_t *buf= pkt->data;

  828.     uint8_t *data= NULL;

  829.     MpegTSWriteStream *ts_st = st->priv_data;

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

  831.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  832. 

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

  834.         pts = pkt->pts + delay;

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

  836.         dts = pkt->dts + delay;

  837. 

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

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

  840.         return -1;

  841.     }

  842.     ts_st->first_pts_check = 0;

  843. 

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

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

  846.         uint32_t state = -1;

  847. 

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

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

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

  851.             return -1;

  852.         }

  853. 

  854.         do {

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

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

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

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

  859. 

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

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

  862.             if (!data)

  863.                 return -1;

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

  865.             AV_WB32(data, 0x00000001);

  866.             data[4] = 0x09;

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

  868.             buf  = data;

  869.             size = pkt->size+6;

  870.         }

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

  872.         if (pkt->size < 2)

  873.             return -1;

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

  875.             ADTSContext *adts = ts_st->adts;

  876.             int new_size;

  877.             if (!adts) {

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

  879.                        "and extradata missing\n");

  880.                 return -1;

  881.             }

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

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

  884.                 return -1;

  885.             data = av_malloc(new_size);

  886.             if (!data)

  887.                 return AVERROR(ENOMEM);

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

  889.             if (adts->pce_size) {

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

  891.                 adts->pce_size = 0;

  892.             }

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

  894.             buf = data;

  895.             size = new_size;

  896.         }

  897.     }

  898. 

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

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

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

  902.         av_free(data);

  903.         return 0;

  904.     }

  905. 

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

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

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

  909.         ts_st->payload_index = 0;

  910.     }

  911. 

  912.     if (!ts_st->payload_index) {

  913.         ts_st->payload_pts = pts;

  914.         ts_st->payload_dts = dts;

  915.     }

  916. 

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

  918.     ts_st->payload_index += size;

  919. 

  920.     av_free(data);

  921. 

  922.     return 0;

  923. }

  924. 

  925. static int mpegts_write_end(AVFormatContext *s)

  926. {

  927.     MpegTSWrite *ts = s->priv_data;

  928.     MpegTSWriteStream *ts_st;

  929.     MpegTSService *service;

  930.     AVStream *st;

  931.     int i;

  932. 

  933.     /* flush current packets */

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

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

  936.         ts_st = st->priv_data;

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

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

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

  940.         }

  941.         av_freep(&ts_st->adts);

  942.     }

  943.     put_flush_packet(s->pb);

  944. 

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

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

  947.         av_freep(&service->provider_name);

  948.         av_freep(&service->name);

  949.         av_free(service);

  950.     }

  951.     av_free(ts->services);

  952. 

  953.     return 0;

  954. }

  955. 

  956. AVOutputFormat ff_mpegts_muxer = {

  957.     "mpegts",

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

  959.     "video/x-mpegts",

  960.     "ts,m2t",

  961.     sizeof(MpegTSWrite),

  962.     CODEC_ID_MP2,

  963.     CODEC_ID_MPEG2VIDEO,

  964.     mpegts_write_header,

  965.     mpegts_write_packet,

  966.     mpegts_write_end,

  967. };