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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. 

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

  133.     /* check if not too big */

  134.     if (tot_len > 1024)

  135.         return -1;

  136. 

  137.     q = section;

  138.     *q++ = tid;

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

  140.     put16(&q, id);

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

  142.     *q++ = sec_num;

  143.     *q++ = last_sec_num;

  144.     memcpy(q, buf, len);

  145. 

  146.     mpegts_write_section(s, section, tot_len);

  147.     return 0;

  148. }

  149. 

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

  151. /* mpegts writer */

  152. 

  153. #define DEFAULT_PMT_START_PID   0x1000

  154. #define DEFAULT_START_PID       0x0100

  155. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  156. #define DEFAULT_SERVICE_NAME    "Service01"

  157. 

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

  159. #define DEFAULT_ONID            0x0001

  160. #define DEFAULT_TSID            0x0001

  161. #define DEFAULT_SID             0x0001

  162. 

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

  164. #define DEFAULT_PES_HEADER_FREQ 16

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

  166. 

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

  168. #define SDT_RETRANS_TIME 500

  169. #define PAT_RETRANS_TIME 100

  170. #define PCR_RETRANS_TIME 20

  171. 

  172. typedef struct MpegTSWriteStream {

  173.     struct MpegTSService *service;

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

  175.     int cc;

  176.     int payload_index;

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

  178.     int64_t payload_pts;

  179.     int64_t payload_dts;

  180.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  181.     ADTSContext *adts;

  182. } MpegTSWriteStream;

  183. 

  184. static void mpegts_write_pat(AVFormatContext *s)

  185. {

  186.     MpegTSWrite *ts = s->priv_data;

  187.     MpegTSService *service;

  188.     uint8_t data[1012], *q;

  189.     int i;

  190. 

  191.     q = data;

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

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

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

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

  196.     }

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

  198.                           data, q - data);

  199. }

  200. 

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

  202. {

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

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

  205.     int val, stream_type, i;

  206. 

  207.     q = data;

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

  209. 

  210.     program_info_length_ptr = q;

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

  212. 

  213.     /* put program info here */

  214. 

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

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

  217.     program_info_length_ptr[1] = val;

  218. 

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

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

  221.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  224.         case CODEC_ID_MPEG1VIDEO:

  225.         case CODEC_ID_MPEG2VIDEO:

  226.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  227.             break;

  228.         case CODEC_ID_MPEG4:

  229.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  230.             break;

  231.         case CODEC_ID_H264:

  232.             stream_type = STREAM_TYPE_VIDEO_H264;

  233.             break;

  234.         case CODEC_ID_DIRAC:

  235.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  236.             break;

  237.         case CODEC_ID_MP2:

  238.         case CODEC_ID_MP3:

  239.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  240.             break;

  241.         case CODEC_ID_AAC:

  242.             stream_type = STREAM_TYPE_AUDIO_AAC;

  243.             break;

  244.         case CODEC_ID_AC3:

  245.             stream_type = STREAM_TYPE_AUDIO_AC3;

  246.             break;

  247.         default:

  248.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  249.             break;

  250.         }

  251.         *q++ = stream_type;

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

  253.         desc_length_ptr = q;

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

  255. 

  256.         /* write optional descriptors here */

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

  258.         case AVMEDIA_TYPE_AUDIO:

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

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

  261.                 *q++ = 4;

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

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

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

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

  266.             }

  267.             break;

  268.         case AVMEDIA_TYPE_SUBTITLE:

  269.             {

  270.                 const char *language;

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

  272.                 *q++ = 0x59;

  273.                 *q++ = 8;

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

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

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

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

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

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

  280.                     q += 4;

  281.                 } else {

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

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

  284.                 }

  285.             }

  286.             break;

  287.         case AVMEDIA_TYPE_VIDEO:

  288.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  290.                 *q++ = 4;

  291.                 *q++ = 'd';

  292.                 *q++ = 'r';

  293.                 *q++ = 'a';

  294.                 *q++ = 'c';

  295.             }

  296.             break;

  297.         }

  298. 

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

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

  301.         desc_length_ptr[1] = val;

  302.     }

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

  304.                           data, q - data);

  305. }

  306. 

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

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

  309. {

  310.     uint8_t *q;

  311.     int len;

  312. 

  313.     q = *q_ptr;

  314.     if (!str)

  315.         len = 0;

  316.     else

  317.         len = strlen(str);

  318.     *q++ = len;

  319.     memcpy(q, str, len);

  320.     q += len;

  321.     *q_ptr = q;

  322. }

  323. 

  324. static void mpegts_write_sdt(AVFormatContext *s)

  325. {

  326.     MpegTSWrite *ts = s->priv_data;

  327.     MpegTSService *service;

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

  329.     int i, running_status, free_ca_mode, val;

  330. 

  331.     q = data;

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

  333.     *q++ = 0xff;

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

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

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

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

  338.         desc_list_len_ptr = q;

  339.         q += 2;

  340.         running_status = 4; /* running */

  341.         free_ca_mode = 0;

  342. 

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

  344.         *q++ = 0x48;

  345.         desc_len_ptr = q;

  346.         q++;

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

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

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

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

  351. 

  352.         /* fill descriptor length */

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

  354.             (q - desc_list_len_ptr - 2);

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

  356.         desc_list_len_ptr[1] = val;

  357.     }

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

  359.                           data, q - data);

  360. }

  361. 

  362. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  363.                                          int sid,

  364.                                          const char *provider_name,

  365.                                          const char *name)

  366. {

  367.     MpegTSService *service;

  368. 

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

  370.     if (!service)

  371.         return NULL;

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

  373.     service->sid = sid;

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

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

  376.     service->pcr_pid = 0x1fff;

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

  378.     return service;

  379. }

  380. 

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

  382. {

  383.     AVFormatContext *ctx = s->opaque;

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

  385. }

  386. 

  387. static int mpegts_write_header(AVFormatContext *s)

  388. {

  389.     MpegTSWrite *ts = s->priv_data;

  390.     MpegTSWriteStream *ts_st;

  391.     MpegTSService *service;

  392.     AVStream *st, *pcr_st = NULL;

  393.     AVMetadataTag *title, *provider;

  394.     int i, j;

  395.     const char *service_name;

  396.     const char *provider_name;

  397.     int *pids;

  398. 

  399.     ts->tsid = DEFAULT_TSID;

  400.     ts->onid = DEFAULT_ONID;

  401.     /* allocate a single DVB service */

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

  403.     if (!title)

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

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

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

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

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

  409.     service->pmt.write_packet = section_write_packet;

  410.     service->pmt.opaque = s;

  411.     service->pmt.cc = 15;

  412. 

  413.     ts->pat.pid = PAT_PID;

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

  415.     ts->pat.write_packet = section_write_packet;

  416.     ts->pat.opaque = s;

  417. 

  418.     ts->sdt.pid = SDT_PID;

  419.     ts->sdt.cc = 15;

  420.     ts->sdt.write_packet = section_write_packet;

  421.     ts->sdt.opaque = s;

  422. 

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

  424.     if (!pids)

  425.         return AVERROR(ENOMEM);

  426. 

  427.     /* assign pids to each stream */

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

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

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

  431.         if (!ts_st)

  432.             goto fail;

  433.         st->priv_data = ts_st;

  434.         ts_st->service = service;

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

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

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

  438.             ts_st->pid = DEFAULT_START_PID + i;

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

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

  441.         } else {

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

  443.             goto fail;

  444.         }

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

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

  447.             goto fail;

  448.         }

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

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

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

  452.                 goto fail;

  453.             }

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

  455.         ts_st->payload_pts = AV_NOPTS_VALUE;

  456.         ts_st->payload_dts = AV_NOPTS_VALUE;

  457.         ts_st->first_pts_check = 1;

  458.         ts_st->cc = 15;

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

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

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

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

  463.             pcr_st = st;

  464.         }

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

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

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

  468.             if (!ts_st->adts)

  469.                 return AVERROR(ENOMEM);

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

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

  472.                 return -1;

  473.         }

  474.     }

  475. 

  476.     av_free(pids);

  477. 

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

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

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

  481.         ts_st = pcr_st->priv_data;

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

  483.     }

  484. 

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

  486. 

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

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

  496.     } else {

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

  498.         ts->sdt_packet_period = 200;

  499.         ts->pat_packet_period = 40;

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

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

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

  503.                 service->pcr_packet_period =

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

  505.             } else {

  506.                 service->pcr_packet_period =

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

  508.             }

  509.         } else {

  510.             // max delta PCR 0.1s

  511.             service->pcr_packet_period =

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

  513.         }

  514.     }

  515. 

  516.     // output a PCR as soon as possible

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

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

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

  520. 

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

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

  523.     else

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

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

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

  527.            service->pcr_packet_period,

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

  529. 

  530.     put_flush_packet(s->pb);

  531. 

  532.     return 0;

  533. 

  534.  fail:

  535.     av_free(pids);

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

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

  538.         av_free(st->priv_data);

  539.     }

  540.     return -1;

  541. }

  542. 

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

  544. static void retransmit_si_info(AVFormatContext *s)

  545. {

  546.     MpegTSWrite *ts = s->priv_data;

  547.     int i;

  548. 

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

  550.         ts->sdt_packet_count = 0;

  551.         mpegts_write_sdt(s);

  552.     }

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

  554.         ts->pat_packet_count = 0;

  555.         mpegts_write_pat(s);

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

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

  558.         }

  559.     }

  560. }

  561. 

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

  563. {

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

  565.            ts->first_pcr;

  566. }

  567. 

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

  569. {

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

  571. 

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

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

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

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

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

  577.     *buf++ = pcr_low;

  578. 

  579.     return buf;

  580. }

  581. 

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

  583. static void mpegts_insert_null_packet(AVFormatContext *s)

  584. {

  585.     uint8_t *q;

  586.     uint8_t buf[TS_PACKET_SIZE];

  587. 

  588.     q = buf;

  589.     *q++ = 0x47;

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

  591.     *q++ = 0xff;

  592.     *q++ = 0x10;

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

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

  595. }

  596. 

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

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

  599. {

  600.     MpegTSWrite *ts = s->priv_data;

  601.     MpegTSWriteStream *ts_st = st->priv_data;

  602.     uint8_t *q;

  603.     uint8_t buf[TS_PACKET_SIZE];

  604. 

  605.     q = buf;

  606.     *q++ = 0x47;

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

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

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

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

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

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

  613. 

  614.     /* PCR coded into 6 bytes */

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

  616. 

  617.     /* stuffing bytes */

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

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

  620. }

  621. 

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

  623. {

  624.     int val;

  625. 

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

  627.     *q++ = val;

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

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

  630.     *q++ = val;

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

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

  633.     *q++ = val;

  634. }

  635. 

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

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

  638.  * to exactly fill the last ts packet.

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

  640.  */

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

  642.                              const uint8_t *payload, int payload_size,

  643.                              int64_t pts, int64_t dts)

  644. {

  645.     MpegTSWriteStream *ts_st = st->priv_data;

  646.     MpegTSWrite *ts = s->priv_data;

  647.     uint8_t buf[TS_PACKET_SIZE];

  648.     uint8_t *q;

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

  650.     int afc_len, stuffing_len;

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

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

  653. 

  654.     is_start = 1;

  655.     while (payload_size > 0) {

  656.         retransmit_si_info(s);

  657. 

  658.         write_pcr = 0;

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

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

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

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

  663.                 ts_st->service->pcr_packet_period) {

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

  665.                 write_pcr = 1;

  666.             }

  667.         }

  668. 

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

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

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

  672.             if (write_pcr)

  673.                 mpegts_insert_pcr_only(s, st);

  674.             else

  675.                 mpegts_insert_null_packet(s);

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

  677.         }

  678. 

  679.         /* prepare packet header */

  680.         q = buf;

  681.         *q++ = 0x47;

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

  683.         if (is_start)

  684.             val |= 0x40;

  685.         *q++ = val;

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

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

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

  689.         if (write_pcr) {

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

  691.             if (ts->mux_rate > 1)

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

  693.             else

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

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

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

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

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

  699.             q = write_pcr_bits(q, pcr);

  700.         }

  701.         if (is_start) {

  702.             int pes_extension = 0;

  703.             /* write PES header */

  704.             *q++ = 0x00;

  705.             *q++ = 0x00;

  706.             *q++ = 0x01;

  707.             private_code = 0;

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

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

  710.                     *q++ = 0xfd;

  711.                 } else

  712.                     *q++ = 0xe0;

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

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

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

  716.                 *q++ = 0xc0;

  717.             } else {

  718.                 *q++ = 0xbd;

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

  720.                     private_code = 0x20;

  721.                 }

  722.             }

  723.             header_len = 0;

  724.             flags = 0;

  725.             if (pts != AV_NOPTS_VALUE) {

  726.                 header_len += 5;

  727.                 flags |= 0x80;

  728.             }

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

  730.                 header_len += 5;

  731.                 flags |= 0x40;

  732.             }

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

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

  735.                 /* set PES_extension_flag */

  736.                 pes_extension = 1;

  737.                 flags |= 0x01;

  738. 

  739.                 /*

  740.                 * One byte for PES2 extension flag +

  741.                 * one byte for extension length +

  742.                 * one byte for extension id

  743.                 */

  744.                 header_len += 3;

  745.             }

  746.             len = payload_size + header_len + 3;

  747.             if (private_code != 0)

  748.                 len++;

  749.             if (len > 0xffff)

  750.                 len = 0;

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

  752.             *q++ = len;

  753.             val = 0x80;

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

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

  756.                 val |= 0x04;

  757.             *q++ = val;

  758.             *q++ = flags;

  759.             *q++ = header_len;

  760.             if (pts != AV_NOPTS_VALUE) {

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

  762.                 q += 5;

  763.             }

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

  765.                 write_pts(q, 1, dts);

  766.                 q += 5;

  767.             }

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

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

  770.                 *q++ = flags;

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

  772.                 /*

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

  774.                 * write the extended stream id

  775.                 */

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

  777.             }

  778.             if (private_code != 0)

  779.                 *q++ = private_code;

  780.             is_start = 0;

  781.         }

  782.         /* header size */

  783.         header_len = q - buf;

  784.         /* data len */

  785.         len = TS_PACKET_SIZE - header_len;

  786.         if (len > payload_size)

  787.             len = payload_size;

  788.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  789.         if (stuffing_len > 0) {

  790.             /* add stuffing with AFC */

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

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

  793.                 afc_len = buf[4] + 1;

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

  795.                         buf + 4 + afc_len,

  796.                         header_len - (4 + afc_len));

  797.                 buf[4] += stuffing_len;

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

  799.             } else {

  800.                 /* add stuffing */

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

  802.                 buf[3] |= 0x20;

  803.                 buf[4] = stuffing_len - 1;

  804.                 if (stuffing_len >= 2) {

  805.                     buf[5] = 0x00;

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

  807.                 }

  808.             }

  809.         }

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

  811.         payload += len;

  812.         payload_size -= len;

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

  814.     }

  815.     put_flush_packet(s->pb);

  816. }

  817. 

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

  819. {

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

  821.     int size = pkt->size;

  822.     uint8_t *buf= pkt->data;

  823.     uint8_t *data= NULL;

  824.     MpegTSWriteStream *ts_st = st->priv_data;

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

  826.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  827. 

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

  829.         pts = pkt->pts + delay;

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

  831.         dts = pkt->dts + delay;

  832. 

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

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

  835.         return -1;

  836.     }

  837.     ts_st->first_pts_check = 0;

  838. 

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

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

  841.         uint32_t state = -1;

  842. 

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

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

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

  846.             return -1;

  847.         }

  848. 

  849.         do {

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

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

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

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

  854. 

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

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

  857.             if (!data)

  858.                 return -1;

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

  860.             AV_WB32(data, 0x00000001);

  861.             data[4] = 0x09;

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

  863.             buf  = data;

  864.             size = pkt->size+6;

  865.         }

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

  867.         if (pkt->size < 2)

  868.             return -1;

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

  870.             ADTSContext *adts = ts_st->adts;

  871.             int new_size;

  872.             if (!adts) {

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

  874.                        "and extradata missing\n");

  875.                 return -1;

  876.             }

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

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

  879.                 return -1;

  880.             data = av_malloc(new_size);

  881.             if (!data)

  882.                 return AVERROR(ENOMEM);

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

  884.             if (adts->pce_size) {

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

  886.                 adts->pce_size = 0;

  887.             }

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

  889.             buf = data;

  890.             size = new_size;

  891.         }

  892.     }

  893. 

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

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

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

  897.         av_free(data);

  898.         return 0;

  899.     }

  900. 

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

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

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

  904.         ts_st->payload_index = 0;

  905.     }

  906. 

  907.     if (!ts_st->payload_index) {

  908.         ts_st->payload_pts = pts;

  909.         ts_st->payload_dts = dts;

  910.     }

  911. 

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

  913.     ts_st->payload_index += size;

  914. 

  915.     av_free(data);

  916. 

  917.     return 0;

  918. }

  919. 

  920. static int mpegts_write_end(AVFormatContext *s)

  921. {

  922.     MpegTSWrite *ts = s->priv_data;

  923.     MpegTSWriteStream *ts_st;

  924.     MpegTSService *service;

  925.     AVStream *st;

  926.     int i;

  927. 

  928.     /* flush current packets */

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

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

  931.         ts_st = st->priv_data;

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

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

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

  935.         }

  936.         av_freep(&ts_st->adts);

  937.     }

  938.     put_flush_packet(s->pb);

  939. 

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

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

  942.         av_freep(&service->provider_name);

  943.         av_freep(&service->name);

  944.         av_free(service);

  945.     }

  946.     av_free(ts->services);

  947. 

  948.     return 0;

  949. }

  950. 

  951. AVOutputFormat mpegts_muxer = {

  952.     "mpegts",

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

  954.     "video/x-mpegts",

  955.     "ts,m2t",

  956.     sizeof(MpegTSWrite),

  957.     CODEC_ID_MP2,

  958.     CODEC_ID_MPEG2VIDEO,

  959.     mpegts_write_header,

  960.     mpegts_write_packet,

  961.     mpegts_write_end,

  962. };