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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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 "libavutil/dict.h"

  25. #include "libavutil/mathematics.h"

  26. #include "libavutil/opt.h"

  27. #include "libavcodec/mpegvideo.h"

  28. #include "avformat.h"

  29. #include "internal.h"

  30. #include "mpegts.h"

  31. #include "adts.h"

  32. 

  33. #define PCR_TIME_BASE 27000000

  34. 

  35. /* write DVB SI sections */

  36. 

  37. /*********************************************/

  38. /* mpegts section writer */

  39. 

  40. typedef struct MpegTSSection {

  41.     int pid;

  42.     int cc;

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

  44.     void *opaque;

  45. } MpegTSSection;

  46. 

  47. typedef struct MpegTSService {

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

  49.     int sid;           /* service ID */

  50.     char *name;

  51.     char *provider_name;

  52.     int pcr_pid;

  53.     int pcr_packet_count;

  54.     int pcr_packet_period;

  55. } MpegTSService;

  56. 

  57. typedef struct MpegTSWrite {

  58.     const AVClass *av_class;

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

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

  61.     MpegTSService **services;

  62.     int sdt_packet_count;

  63.     int sdt_packet_period;

  64.     int pat_packet_count;

  65.     int pat_packet_period;

  66.     int nb_services;

  67.     int onid;

  68.     int tsid;

  69.     int64_t first_pcr;

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

  71.     int pes_payload_size;

  72. 

  73.     int transport_stream_id;

  74.     int original_network_id;

  75.     int service_id;

  76. 

  77.     int pmt_start_pid;

  78.     int start_pid;

  79. } MpegTSWrite;

  80. 

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

  82. #define DEFAULT_PES_HEADER_FREQ 16

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

  84. 

  85. static const AVOption options[] = {

  86.     { "mpegts_transport_stream_id", "Set transport_stream_id field.",

  87.       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

  88.     { "mpegts_original_network_id", "Set original_network_id field.",

  89.       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

  90.     { "mpegts_service_id", "Set service_id field.",

  91.       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

  92.     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",

  93.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

  94.     { "mpegts_start_pid", "Set the first pid.",

  95.       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},

  96.     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  97.     { "pes_payload_size", "Minimum PES packet payload in bytes",

  98.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  99.     { NULL },

  100. };

  101. 

  102. static const AVClass mpegts_muxer_class = {

  103.     .class_name     = "MPEGTS muxer",

  104.     .item_name      = av_default_item_name,

  105.     .option         = options,

  106.     .version        = LIBAVUTIL_VERSION_INT,

  107. };

  108. 

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

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

  111. {

  112.     unsigned int crc;

  113.     unsigned char packet[TS_PACKET_SIZE];

  114.     const unsigned char *buf_ptr;

  115.     unsigned char *q;

  116.     int first, b, len1, left;

  117. 

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

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

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

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

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

  123. 

  124.     /* send each packet */

  125.     buf_ptr = buf;

  126.     while (len > 0) {

  127.         first = (buf == buf_ptr);

  128.         q = packet;

  129.         *q++ = 0x47;

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

  131.         if (first)

  132.             b |= 0x40;

  133.         *q++ = b;

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

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

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

  137.         if (first)

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

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

  140.         if (len1 > len)

  141.             len1 = len;

  142.         memcpy(q, buf_ptr, len1);

  143.         q += len1;

  144.         /* add known padding data */

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

  146.         if (left > 0)

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

  148. 

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

  150. 

  151.         buf_ptr += len1;

  152.         len -= len1;

  153.     }

  154. }

  155. 

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

  157. {

  158.     uint8_t *q;

  159.     q = *q_ptr;

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

  161.     *q++ = val;

  162.     *q_ptr = q;

  163. }

  164. 

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

  166.                           int version, int sec_num, int last_sec_num,

  167.                           uint8_t *buf, int len)

  168. {

  169.     uint8_t section[1024], *q;

  170.     unsigned int tot_len;

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

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

  173. 

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

  175.     /* check if not too big */

  176.     if (tot_len > 1024)

  177.         return -1;

  178. 

  179.     q = section;

  180.     *q++ = tid;

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

  182.     put16(&q, id);

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

  184.     *q++ = sec_num;

  185.     *q++ = last_sec_num;

  186.     memcpy(q, buf, len);

  187. 

  188.     mpegts_write_section(s, section, tot_len);

  189.     return 0;

  190. }

  191. 

  192. /*********************************************/

  193. /* mpegts writer */

  194. 

  195. #define DEFAULT_PROVIDER_NAME   "Libav"

  196. #define DEFAULT_SERVICE_NAME    "Service01"

  197. 

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

  199. #define SDT_RETRANS_TIME 500

  200. #define PAT_RETRANS_TIME 100

  201. #define PCR_RETRANS_TIME 20

  202. 

  203. typedef struct MpegTSWriteStream {

  204.     struct MpegTSService *service;

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

  206.     int cc;

  207.     int payload_size;

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

  209.     int64_t payload_pts;

  210.     int64_t payload_dts;

  211.     int payload_flags;

  212.     uint8_t *payload;

  213.     ADTSContext *adts;

  214. } MpegTSWriteStream;

  215. 

  216. static void mpegts_write_pat(AVFormatContext *s)

  217. {

  218.     MpegTSWrite *ts = s->priv_data;

  219.     MpegTSService *service;

  220.     uint8_t data[1012], *q;

  221.     int i;

  222. 

  223.     q = data;

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

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

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

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

  228.     }

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

  230.                           data, q - data);

  231. }

  232. 

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

  234. {

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

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

  237.     int val, stream_type, i;

  238. 

  239.     q = data;

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

  241. 

  242.     program_info_length_ptr = q;

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

  244. 

  245.     /* put program info here */

  246. 

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

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

  249.     program_info_length_ptr[1] = val;

  250. 

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

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

  253.         MpegTSWriteStream *ts_st = st->priv_data;

  254.         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);

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

  256.         case CODEC_ID_MPEG1VIDEO:

  257.         case CODEC_ID_MPEG2VIDEO:

  258.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  259.             break;

  260.         case CODEC_ID_MPEG4:

  261.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  262.             break;

  263.         case CODEC_ID_H264:

  264.             stream_type = STREAM_TYPE_VIDEO_H264;

  265.             break;

  266.         case CODEC_ID_DIRAC:

  267.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  268.             break;

  269.         case CODEC_ID_MP2:

  270.         case CODEC_ID_MP3:

  271.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  272.             break;

  273.         case CODEC_ID_AAC:

  274.             stream_type = STREAM_TYPE_AUDIO_AAC;

  275.             break;

  276.         case CODEC_ID_AAC_LATM:

  277.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  278.             break;

  279.         case CODEC_ID_AC3:

  280.             stream_type = STREAM_TYPE_AUDIO_AC3;

  281.             break;

  282.         default:

  283.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  284.             break;

  285.         }

  286.         *q++ = stream_type;

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

  288.         desc_length_ptr = q;

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

  290. 

  291.         /* write optional descriptors here */

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

  293.         case AVMEDIA_TYPE_AUDIO:

  294.             if (lang) {

  295.                 char *p;

  296.                 char *next = lang->value;

  297.                 uint8_t *len_ptr;

  298. 

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

  300.                 len_ptr = q++;

  301.                 *len_ptr = 0;

  302. 

  303.                 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {

  304.                     next = strchr(p, ',');

  305.                     if (strlen(p) != 3 && (!next || next != p + 3))

  306.                         continue; /* not a 3-letter code */

  307. 

  308.                     *q++ = *p++;

  309.                     *q++ = *p++;

  310.                     *q++ = *p++;

  311. 

  312.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  313.                     *q++ = 0x01;

  314.                 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)

  315.                     *q++ = 0x02;

  316.                 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)

  317.                     *q++ = 0x03;

  318.                 else

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

  320. 

  321.                     *len_ptr += 4;

  322.                 }

  323. 

  324.                 if (*len_ptr == 0)

  325.                     q -= 2; /* no language codes were written */

  326.             }

  327.             break;

  328.         case AVMEDIA_TYPE_SUBTITLE:

  329.             {

  330.                 const char *language;

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

  332.                 *q++ = 0x59;

  333.                 *q++ = 8;

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

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

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

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

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

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

  340.                     q += 4;

  341.                 } else {

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

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

  344.                 }

  345.             }

  346.             break;

  347.         case AVMEDIA_TYPE_VIDEO:

  348.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  350.                 *q++ = 4;

  351.                 *q++ = 'd';

  352.                 *q++ = 'r';

  353.                 *q++ = 'a';

  354.                 *q++ = 'c';

  355.             }

  356.             break;

  357.         }

  358. 

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

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

  361.         desc_length_ptr[1] = val;

  362.     }

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

  364.                           data, q - data);

  365. }

  366. 

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

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

  369. {

  370.     uint8_t *q;

  371.     int len;

  372. 

  373.     q = *q_ptr;

  374.     if (!str)

  375.         len = 0;

  376.     else

  377.         len = strlen(str);

  378.     *q++ = len;

  379.     memcpy(q, str, len);

  380.     q += len;

  381.     *q_ptr = q;

  382. }

  383. 

  384. static void mpegts_write_sdt(AVFormatContext *s)

  385. {

  386.     MpegTSWrite *ts = s->priv_data;

  387.     MpegTSService *service;

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

  389.     int i, running_status, free_ca_mode, val;

  390. 

  391.     q = data;

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

  393.     *q++ = 0xff;

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

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

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

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

  398.         desc_list_len_ptr = q;

  399.         q += 2;

  400.         running_status = 4; /* running */

  401.         free_ca_mode = 0;

  402. 

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

  404.         *q++ = 0x48;

  405.         desc_len_ptr = q;

  406.         q++;

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

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

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

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

  411. 

  412.         /* fill descriptor length */

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

  414.             (q - desc_list_len_ptr - 2);

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

  416.         desc_list_len_ptr[1] = val;

  417.     }

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

  419.                           data, q - data);

  420. }

  421. 

  422. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  423.                                          int sid,

  424.                                          const char *provider_name,

  425.                                          const char *name)

  426. {

  427.     MpegTSService *service;

  428. 

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

  430.     if (!service)

  431.         return NULL;

  432.     service->pmt.pid = ts->pmt_start_pid + ts->nb_services;

  433.     service->sid = sid;

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

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

  436.     service->pcr_pid = 0x1fff;

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

  438.     return service;

  439. }

  440. 

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

  442. {

  443.     AVFormatContext *ctx = s->opaque;

  444.     avio_write(ctx->pb, packet, TS_PACKET_SIZE);

  445. }

  446. 

  447. static int mpegts_write_header(AVFormatContext *s)

  448. {

  449.     MpegTSWrite *ts = s->priv_data;

  450.     MpegTSWriteStream *ts_st;

  451.     MpegTSService *service;

  452.     AVStream *st, *pcr_st = NULL;

  453.     AVDictionaryEntry *title, *provider;

  454.     int i, j;

  455.     const char *service_name;

  456.     const char *provider_name;

  457.     int *pids;

  458. 

  459.     // round up to a whole number of TS packets

  460.     ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;

  461. 

  462.     ts->tsid = ts->transport_stream_id;

  463.     ts->onid = ts->original_network_id;

  464.     /* allocate a single DVB service */

  465.     title = av_dict_get(s->metadata, "service_name", NULL, 0);

  466.     if (!title)

  467.         title = av_dict_get(s->metadata, "title", NULL, 0);

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

  469.     provider = av_dict_get(s->metadata, "service_provider", NULL, 0);

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

  471.     service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);

  472.     service->pmt.write_packet = section_write_packet;

  473.     service->pmt.opaque = s;

  474.     service->pmt.cc = 15;

  475. 

  476.     ts->pat.pid = PAT_PID;

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

  478.     ts->pat.write_packet = section_write_packet;

  479.     ts->pat.opaque = s;

  480. 

  481.     ts->sdt.pid = SDT_PID;

  482.     ts->sdt.cc = 15;

  483.     ts->sdt.write_packet = section_write_packet;

  484.     ts->sdt.opaque = s;

  485. 

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

  487.     if (!pids)

  488.         return AVERROR(ENOMEM);

  489. 

  490.     /* assign pids to each stream */

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

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

  493.         avpriv_set_pts_info(st, 33, 1, 90000);

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

  495.         if (!ts_st)

  496.             goto fail;

  497.         st->priv_data = ts_st;

  498.         ts_st->payload = av_mallocz(ts->pes_payload_size);

  499.         if (!ts_st->payload)

  500.             goto fail;

  501.         ts_st->service = service;

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

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

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

  505.             ts_st->pid = ts->start_pid + i;

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

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

  508.         } else {

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

  510.             goto fail;

  511.         }

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

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

  514.             goto fail;

  515.         }

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

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

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

  519.                 goto fail;

  520.             }

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

  522.         ts_st->payload_pts = AV_NOPTS_VALUE;

  523.         ts_st->payload_dts = AV_NOPTS_VALUE;

  524.         ts_st->first_pts_check = 1;

  525.         ts_st->cc = 15;

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

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

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

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

  530.             pcr_st = st;

  531.         }

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

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

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

  535.             if (!ts_st->adts)

  536.                 goto fail;

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

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

  539.                 goto fail;

  540.         }

  541.     }

  542. 

  543.     av_free(pids);

  544. 

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

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

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

  548.         ts_st = pcr_st->priv_data;

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

  550.     }

  551. 

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

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

  554.             (TS_PACKET_SIZE * 8 * 1000);

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

  556.             (TS_PACKET_SIZE * 8 * 1000);

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

  558.             (TS_PACKET_SIZE * 8 * 1000);

  559. 

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

  561.     } else {

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

  563.         ts->sdt_packet_period = 200;

  564.         ts->pat_packet_period = 40;

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

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

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

  568.                 service->pcr_packet_period =

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

  570.             } else {

  571.                 service->pcr_packet_period =

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

  573.             }

  574.         } else {

  575.             // max delta PCR 0.1s

  576.             service->pcr_packet_period =

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

  578.         }

  579.     }

  580. 

  581.     // output a PCR as soon as possible

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

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

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

  585. 

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

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

  588.     else

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

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

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

  592.            service->pcr_packet_period,

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

  594. 

  595.     avio_flush(s->pb);

  596. 

  597.     return 0;

  598. 

  599.  fail:

  600.     av_free(pids);

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

  602.         MpegTSWriteStream *ts_st;

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

  604.         ts_st = st->priv_data;

  605.         if (ts_st) {

  606.             av_freep(&ts_st->payload);

  607.             av_freep(&ts_st->adts);

  608.         }

  609.         av_freep(&st->priv_data);

  610.     }

  611.     return -1;

  612. }

  613. 

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

  615. static void retransmit_si_info(AVFormatContext *s)

  616. {

  617.     MpegTSWrite *ts = s->priv_data;

  618.     int i;

  619. 

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

  621.         ts->sdt_packet_count = 0;

  622.         mpegts_write_sdt(s);

  623.     }

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

  625.         ts->pat_packet_count = 0;

  626.         mpegts_write_pat(s);

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

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

  629.         }

  630.     }

  631. }

  632. 

  633. static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)

  634. {

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

  636.            ts->first_pcr;

  637. }

  638. 

  639. static int write_pcr_bits(uint8_t *buf, int64_t pcr)

  640. {

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

  642. 

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

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

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

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

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

  648.     *buf++ = pcr_low;

  649. 

  650.     return 6;

  651. }

  652. 

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

  654. static void mpegts_insert_null_packet(AVFormatContext *s)

  655. {

  656.     uint8_t *q;

  657.     uint8_t buf[TS_PACKET_SIZE];

  658. 

  659.     q = buf;

  660.     *q++ = 0x47;

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

  662.     *q++ = 0xff;

  663.     *q++ = 0x10;

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

  665.     avio_write(s->pb, buf, TS_PACKET_SIZE);

  666. }

  667. 

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

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

  670. {

  671.     MpegTSWrite *ts = s->priv_data;

  672.     MpegTSWriteStream *ts_st = st->priv_data;

  673.     uint8_t *q;

  674.     uint8_t buf[TS_PACKET_SIZE];

  675. 

  676.     q = buf;

  677.     *q++ = 0x47;

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

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

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

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

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

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

  684. 

  685.     /* PCR coded into 6 bytes */

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

  687. 

  688.     /* stuffing bytes */

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

  690.     avio_write(s->pb, buf, TS_PACKET_SIZE);

  691. }

  692. 

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

  694. {

  695.     int val;

  696. 

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

  698.     *q++ = val;

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

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

  701.     *q++ = val;

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

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

  704.     *q++ = val;

  705. }

  706. 

  707. /* Set an adaptation field flag in an MPEG-TS packet*/

  708. static void set_af_flag(uint8_t *pkt, int flag)

  709. {

  710.     // expect at least one flag to set

  711.     assert(flag);

  712. 

  713.     if ((pkt[3] & 0x20) == 0) {

  714.         // no AF yet, set adaptation field flag

  715.         pkt[3] |= 0x20;

  716.         // 1 byte length, no flags

  717.         pkt[4] = 1;

  718.         pkt[5] = 0;

  719.     }

  720.     pkt[5] |= flag;

  721. }

  722. 

  723. /* Extend the adaptation field by size bytes */

  724. static void extend_af(uint8_t *pkt, int size)

  725. {

  726.     // expect already existing adaptation field

  727.     assert(pkt[3] & 0x20);

  728.     pkt[4] += size;

  729. }

  730. 

  731. /* Get a pointer to MPEG-TS payload (right after TS packet header) */

  732. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  733. {

  734.     if (pkt[3] & 0x20)

  735.         return pkt + 5 + pkt[4];

  736.     else

  737.         return pkt + 4;

  738. }

  739. 

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

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

  742.  * to exactly fill the last ts packet.

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

  744.  */

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

  746.                              const uint8_t *payload, int payload_size,

  747.                              int64_t pts, int64_t dts, int key)

  748. {

  749.     MpegTSWriteStream *ts_st = st->priv_data;

  750.     MpegTSWrite *ts = s->priv_data;

  751.     uint8_t buf[TS_PACKET_SIZE];

  752.     uint8_t *q;

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

  754.     int afc_len, stuffing_len;

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

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

  757. 

  758.     is_start = 1;

  759.     while (payload_size > 0) {

  760.         retransmit_si_info(s);

  761. 

  762.         write_pcr = 0;

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

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

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

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

  767.                 ts_st->service->pcr_packet_period) {

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

  769.                 write_pcr = 1;

  770.             }

  771.         }

  772. 

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

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

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

  776.             if (write_pcr)

  777.                 mpegts_insert_pcr_only(s, st);

  778.             else

  779.                 mpegts_insert_null_packet(s);

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

  781.         }

  782. 

  783.         /* prepare packet header */

  784.         q = buf;

  785.         *q++ = 0x47;

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

  787.         if (is_start)

  788.             val |= 0x40;

  789.         *q++ = val;

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

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

  792.         *q++ = 0x10 | ts_st->cc; // payload indicator + CC

  793.         if (key && is_start && pts != AV_NOPTS_VALUE) {

  794.             // set Random Access for key frames

  795.             if (ts_st->pid == ts_st->service->pcr_pid)

  796.                 write_pcr = 1;

  797.             set_af_flag(buf, 0x40);

  798.             q = get_ts_payload_start(buf);

  799.         }

  800.         if (write_pcr) {

  801.             set_af_flag(buf, 0x10);

  802.             q = get_ts_payload_start(buf);

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

  804.             if (ts->mux_rate > 1)

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

  806.             else

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

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

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

  810.             extend_af(buf, write_pcr_bits(q, pcr));

  811.             q = get_ts_payload_start(buf);

  812.         }

  813.         if (is_start) {

  814.             int pes_extension = 0;

  815.             /* write PES header */

  816.             *q++ = 0x00;

  817.             *q++ = 0x00;

  818.             *q++ = 0x01;

  819.             private_code = 0;

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

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

  822.                     *q++ = 0xfd;

  823.                 } else

  824.                     *q++ = 0xe0;

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

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

  827.                         st->codec->codec_id == CODEC_ID_MP3 ||

  828.                         st->codec->codec_id == CODEC_ID_AAC)) {

  829.                 *q++ = 0xc0;

  830.             } else {

  831.                 *q++ = 0xbd;

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

  833.                     private_code = 0x20;

  834.                 }

  835.             }

  836.             header_len = 0;

  837.             flags = 0;

  838.             if (pts != AV_NOPTS_VALUE) {

  839.                 header_len += 5;

  840.                 flags |= 0x80;

  841.             }

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

  843.                 header_len += 5;

  844.                 flags |= 0x40;

  845.             }

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

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

  848.                 /* set PES_extension_flag */

  849.                 pes_extension = 1;

  850.                 flags |= 0x01;

  851. 

  852.                 /*

  853.                 * One byte for PES2 extension flag +

  854.                 * one byte for extension length +

  855.                 * one byte for extension id

  856.                 */

  857.                 header_len += 3;

  858.             }

  859.             len = payload_size + header_len + 3;

  860.             if (private_code != 0)

  861.                 len++;

  862.             if (len > 0xffff)

  863.                 len = 0;

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

  865.             *q++ = len;

  866.             val = 0x80;

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

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

  869.                 val |= 0x04;

  870.             *q++ = val;

  871.             *q++ = flags;

  872.             *q++ = header_len;

  873.             if (pts != AV_NOPTS_VALUE) {

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

  875.                 q += 5;

  876.             }

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

  878.                 write_pts(q, 1, dts);

  879.                 q += 5;

  880.             }

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

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

  883.                 *q++ = flags;

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

  885.                 /*

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

  887.                 * write the extended stream id

  888.                 */

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

  890.             }

  891.             if (private_code != 0)

  892.                 *q++ = private_code;

  893.             is_start = 0;

  894.         }

  895.         /* header size */

  896.         header_len = q - buf;

  897.         /* data len */

  898.         len = TS_PACKET_SIZE - header_len;

  899.         if (len > payload_size)

  900.             len = payload_size;

  901.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  902.         if (stuffing_len > 0) {

  903.             /* add stuffing with AFC */

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

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

  906.                 afc_len = buf[4] + 1;

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

  908.                         buf + 4 + afc_len,

  909.                         header_len - (4 + afc_len));

  910.                 buf[4] += stuffing_len;

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

  912.             } else {

  913.                 /* add stuffing */

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

  915.                 buf[3] |= 0x20;

  916.                 buf[4] = stuffing_len - 1;

  917.                 if (stuffing_len >= 2) {

  918.                     buf[5] = 0x00;

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

  920.                 }

  921.             }

  922.         }

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

  924.         payload += len;

  925.         payload_size -= len;

  926.         avio_write(s->pb, buf, TS_PACKET_SIZE);

  927.     }

  928.     avio_flush(s->pb);

  929. }

  930. 

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

  932. {

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

  934.     int size = pkt->size;

  935.     uint8_t *buf= pkt->data;

  936.     uint8_t *data= NULL;

  937.     MpegTSWrite *ts = s->priv_data;

  938.     MpegTSWriteStream *ts_st = st->priv_data;

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

  940.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  941. 

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

  943.         pts = pkt->pts + delay;

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

  945.         dts = pkt->dts + delay;

  946. 

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

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

  949.         return -1;

  950.     }

  951.     ts_st->first_pts_check = 0;

  952. 

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

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

  955.         uint32_t state = -1;

  956. 

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

  958.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "

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

  960.             return -1;

  961.         }

  962. 

  963.         do {

  964.             p = avpriv_mpv_find_start_code(p, buf_end, &state);

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

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

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

  968. 

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

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

  971.             if (!data)

  972.                 return -1;

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

  974.             AV_WB32(data, 0x00000001);

  975.             data[4] = 0x09;

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

  977.             buf  = data;

  978.             size = pkt->size+6;

  979.         }

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

  981.         if (pkt->size < 2)

  982.             return -1;

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

  984.             ADTSContext *adts = ts_st->adts;

  985.             int new_size, err;

  986.             if (!adts) {

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

  988.                        "and extradata missing\n");

  989.                 return -1;

  990.             }

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

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

  993.                 return -1;

  994.             data = av_malloc(new_size);

  995.             if (!data)

  996.                 return AVERROR(ENOMEM);

  997.             err = ff_adts_write_frame_header(adts, data, pkt->size,

  998.                                              adts->pce_size);

  999.             if (err < 0) {

  1000.                 av_free(data);

  1001.                 return err;

  1002.             }

  1003.             if (adts->pce_size) {

  1004.                 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);

  1005.                 adts->pce_size = 0;

  1006.             }

  1007.             memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);

  1008.             buf = data;

  1009.             size = new_size;

  1010.         }

  1011.     }

  1012. 

  1013.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  1014.         // for video and subtitle, write a single pes packet

  1015.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1016.         av_free(data);

  1017.         return 0;

  1018.     }

  1019. 

  1020.     if (ts_st->payload_size + size > ts->pes_payload_size) {

  1021.         if (ts_st->payload_size) {

  1022.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1023.                              ts_st->payload_pts, ts_st->payload_dts,

  1024.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1025.             ts_st->payload_size = 0;

  1026.         }

  1027.         if (size > ts->pes_payload_size) {

  1028.             mpegts_write_pes(s, st, buf, size, pts, dts,

  1029.                              pkt->flags & AV_PKT_FLAG_KEY);

  1030.             av_free(data);

  1031.             return 0;

  1032.         }

  1033.     }

  1034. 

  1035.     if (!ts_st->payload_size) {

  1036.         ts_st->payload_pts = pts;

  1037.         ts_st->payload_dts = dts;

  1038.         ts_st->payload_flags = pkt->flags;

  1039.     }

  1040. 

  1041.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1042.     ts_st->payload_size += size;

  1043. 

  1044.     av_free(data);

  1045. 

  1046.     return 0;

  1047. }

  1048. 

  1049. static int mpegts_write_end(AVFormatContext *s)

  1050. {

  1051.     MpegTSWrite *ts = s->priv_data;

  1052.     MpegTSWriteStream *ts_st;

  1053.     MpegTSService *service;

  1054.     AVStream *st;

  1055.     int i;

  1056. 

  1057.     /* flush current packets */

  1058.     for(i = 0; i < s->nb_streams; i++) {

  1059.         st = s->streams[i];

  1060.         ts_st = st->priv_data;

  1061.         if (ts_st->payload_size > 0) {

  1062.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1063.                              ts_st->payload_pts, ts_st->payload_dts,

  1064.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1065.         }

  1066.         av_freep(&ts_st->payload);

  1067.         av_freep(&ts_st->adts);

  1068.     }

  1069.     avio_flush(s->pb);

  1070. 

  1071.     for(i = 0; i < ts->nb_services; i++) {

  1072.         service = ts->services[i];

  1073.         av_freep(&service->provider_name);

  1074.         av_freep(&service->name);

  1075.         av_free(service);

  1076.     }

  1077.     av_free(ts->services);

  1078. 

  1079.     return 0;

  1080. }

  1081. 

  1082. AVOutputFormat ff_mpegts_muxer = {

  1083.     .name              = "mpegts",

  1084.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1085.     .mime_type         = "video/x-mpegts",

  1086.     .extensions        = "ts,m2t",

  1087.     .priv_data_size    = sizeof(MpegTSWrite),

  1088.     .audio_codec       = CODEC_ID_MP2,

  1089.     .video_codec       = CODEC_ID_MPEG2VIDEO,

  1090.     .write_header      = mpegts_write_header,

  1091.     .write_packet      = mpegts_write_packet,

  1092.     .write_trailer     = mpegts_write_end,

  1093.     .priv_class = &mpegts_muxer_class,

  1094. };