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

  73.     unsigned int crc;

  74.     unsigned char packet[TS_PACKET_SIZE];

  75.     const unsigned char *buf_ptr;

  76.     unsigned char *q;

  77.     int first, b, len1, left;

  78. 

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

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

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

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

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

  84. 

  85.     /* send each packet */

  86.     buf_ptr = buf;

  87.     while (len > 0) {

  88.         first = (buf == buf_ptr);

  89.         q = packet;

  90.         *q++ = 0x47;

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

  92.         if (first)

  93.             b |= 0x40;

  94.         *q++ = b;

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

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

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

  98.         if (first)

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

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

  101.         if (len1 > len)

  102.             len1 = len;

  103.         memcpy(q, buf_ptr, len1);

  104.         q += len1;

  105.         /* add known padding data */

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

  107.         if (left > 0)

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

  109. 

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

  111. 

  112.         buf_ptr += len1;

  113.         len -= len1;

  114.     }

  115. }

  116. 

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

  118. {

  119.     uint8_t *q;

  120.     q = *q_ptr;

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

  122.     *q++ = val;

  123.     *q_ptr = q;

  124. }

  125. 

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

  127.                           int version, int sec_num, int last_sec_num,

  128.                           uint8_t *buf, int len)

  129. {

  130.     uint8_t section[1024], *q;

  131.     unsigned int tot_len;

  132. 

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

  134.     /* check if not too big */

  135.     if (tot_len > 1024)

  136.         return -1;

  137. 

  138.     q = section;

  139.     *q++ = tid;

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

  141.     put16(&q, id);

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

  143.     *q++ = sec_num;

  144.     *q++ = last_sec_num;

  145.     memcpy(q, buf, len);

  146. 

  147.     mpegts_write_section(s, section, tot_len);

  148.     return 0;

  149. }

  150. 

  151. /*********************************************/

  152. /* mpegts writer */

  153. 

  154. #define DEFAULT_PMT_START_PID   0x1000

  155. #define DEFAULT_START_PID       0x0100

  156. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  157. #define DEFAULT_SERVICE_NAME    "Service01"

  158. 

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

  160. #define DEFAULT_ONID            0x0001

  161. #define DEFAULT_TSID            0x0001

  162. #define DEFAULT_SID             0x0001

  163. 

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

  165. #define DEFAULT_PES_HEADER_FREQ 16

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

  167. 

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

  169. #define SDT_RETRANS_TIME 500

  170. #define PAT_RETRANS_TIME 100

  171. #define PCR_RETRANS_TIME 20

  172. 

  173. typedef struct MpegTSWriteStream {

  174.     struct MpegTSService *service;

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

  176.     int cc;

  177.     int payload_index;

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

  179.     int64_t payload_pts;

  180.     int64_t payload_dts;

  181.     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];

  182.     ADTSContext *adts;

  183. } MpegTSWriteStream;

  184. 

  185. static void mpegts_write_pat(AVFormatContext *s)

  186. {

  187.     MpegTSWrite *ts = s->priv_data;

  188.     MpegTSService *service;

  189.     uint8_t data[1012], *q;

  190.     int i;

  191. 

  192.     q = data;

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

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

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

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

  197.     }

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

  199.                           data, q - data);

  200. }

  201. 

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

  203. {

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

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

  206.     int val, stream_type, i;

  207. 

  208.     q = data;

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

  210. 

  211.     program_info_length_ptr = q;

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

  213. 

  214.     /* put program info here */

  215. 

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

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

  218.     program_info_length_ptr[1] = val;

  219. 

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

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

  222.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  225.         case CODEC_ID_MPEG1VIDEO:

  226.         case CODEC_ID_MPEG2VIDEO:

  227.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  228.             break;

  229.         case CODEC_ID_MPEG4:

  230.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  231.             break;

  232.         case CODEC_ID_H264:

  233.             stream_type = STREAM_TYPE_VIDEO_H264;

  234.             break;

  235.         case CODEC_ID_DIRAC:

  236.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  237.             break;

  238.         case CODEC_ID_MP2:

  239.         case CODEC_ID_MP3:

  240.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  241.             break;

  242.         case CODEC_ID_AAC:

  243.             stream_type = STREAM_TYPE_AUDIO_AAC;

  244.             break;

  245.         case CODEC_ID_AC3:

  246.             stream_type = STREAM_TYPE_AUDIO_AC3;

  247.             break;

  248.         default:

  249.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  250.             break;

  251.         }

  252.         *q++ = stream_type;

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

  254.         desc_length_ptr = q;

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

  256. 

  257.         /* write optional descriptors here */

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

  259.         case AVMEDIA_TYPE_AUDIO:

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

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

  262.                 *q++ = 4;

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

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

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

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

  267.             }

  268.             break;

  269.         case AVMEDIA_TYPE_SUBTITLE:

  270.             {

  271.                 const char *language;

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

  273.                 *q++ = 0x59;

  274.                 *q++ = 8;

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

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

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

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

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

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

  281.                     q += 4;

  282.                 } else {

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

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

  285.                 }

  286.             }

  287.             break;

  288.         case AVMEDIA_TYPE_VIDEO:

  289.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  291.                 *q++ = 4;

  292.                 *q++ = 'd';

  293.                 *q++ = 'r';

  294.                 *q++ = 'a';

  295.                 *q++ = 'c';

  296.             }

  297.             break;

  298.         }

  299. 

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

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

  302.         desc_length_ptr[1] = val;

  303.     }

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

  305.                           data, q - data);

  306. }

  307. 

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

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

  310. {

  311.     uint8_t *q;

  312.     int len;

  313. 

  314.     q = *q_ptr;

  315.     if (!str)

  316.         len = 0;

  317.     else

  318.         len = strlen(str);

  319.     *q++ = len;

  320.     memcpy(q, str, len);

  321.     q += len;

  322.     *q_ptr = q;

  323. }

  324. 

  325. static void mpegts_write_sdt(AVFormatContext *s)

  326. {

  327.     MpegTSWrite *ts = s->priv_data;

  328.     MpegTSService *service;

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

  330.     int i, running_status, free_ca_mode, val;

  331. 

  332.     q = data;

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

  334.     *q++ = 0xff;

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

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

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

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

  339.         desc_list_len_ptr = q;

  340.         q += 2;

  341.         running_status = 4; /* running */

  342.         free_ca_mode = 0;

  343. 

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

  345.         *q++ = 0x48;

  346.         desc_len_ptr = q;

  347.         q++;

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

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

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

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

  352. 

  353.         /* fill descriptor length */

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

  355.             (q - desc_list_len_ptr - 2);

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

  357.         desc_list_len_ptr[1] = val;

  358.     }

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

  360.                           data, q - data);

  361. }

  362. 

  363. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  364.                                          int sid,

  365.                                          const char *provider_name,

  366.                                          const char *name)

  367. {

  368.     MpegTSService *service;

  369. 

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

  371.     if (!service)

  372.         return NULL;

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

  374.     service->sid = sid;

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

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

  377.     service->pcr_pid = 0x1fff;

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

  379.     return service;

  380. }

  381. 

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

  383. {

  384.     AVFormatContext *ctx = s->opaque;

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

  386. }

  387. 

  388. static int mpegts_write_header(AVFormatContext *s)

  389. {

  390.     MpegTSWrite *ts = s->priv_data;

  391.     MpegTSWriteStream *ts_st;

  392.     MpegTSService *service;

  393.     AVStream *st, *pcr_st = NULL;

  394.     AVMetadataTag *title, *provider;

  395.     int i, j;

  396.     const char *service_name;

  397.     const char *provider_name;

  398.     int *pids;

  399. 

  400.     ts->tsid = DEFAULT_TSID;

  401.     ts->onid = DEFAULT_ONID;

  402.     /* allocate a single DVB service */

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

  404.     if (!title)

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

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

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

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

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

  410.     service->pmt.write_packet = section_write_packet;

  411.     service->pmt.opaque = s;

  412.     service->pmt.cc = 15;

  413. 

  414.     ts->pat.pid = PAT_PID;

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

  416.     ts->pat.write_packet = section_write_packet;

  417.     ts->pat.opaque = s;

  418. 

  419.     ts->sdt.pid = SDT_PID;

  420.     ts->sdt.cc = 15;

  421.     ts->sdt.write_packet = section_write_packet;

  422.     ts->sdt.opaque = s;

  423. 

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

  425.     if (!pids)

  426.         return AVERROR(ENOMEM);

  427. 

  428.     /* assign pids to each stream */

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

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

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

  432.         if (!ts_st)

  433.             goto fail;

  434.         st->priv_data = ts_st;

  435.         ts_st->service = service;

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

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

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

  439.             ts_st->pid = DEFAULT_START_PID + i;

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

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

  442.         } else {

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

  444.             goto fail;

  445.         }

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

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

  448.             goto fail;

  449.         }

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

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

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

  453.                 goto fail;

  454.             }

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

  456.         ts_st->payload_pts = AV_NOPTS_VALUE;

  457.         ts_st->payload_dts = AV_NOPTS_VALUE;

  458.         ts_st->first_pts_check = 1;

  459.         ts_st->cc = 15;

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

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

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

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

  464.             pcr_st = st;

  465.         }

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

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

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

  469.             if (!ts_st->adts)

  470.                 return AVERROR(ENOMEM);

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

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

  473.                 return -1;

  474.         }

  475.     }

  476. 

  477.     av_free(pids);

  478. 

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

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

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

  482.         ts_st = pcr_st->priv_data;

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

  484.     }

  485. 

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

  487. 

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

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

  490.             (TS_PACKET_SIZE * 8 * 1000);

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

  492.             (TS_PACKET_SIZE * 8 * 1000);

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

  494.             (TS_PACKET_SIZE * 8 * 1000);

  495. 

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

  497.     } else {

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

  499.         ts->sdt_packet_period = 200;

  500.         ts->pat_packet_period = 40;

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

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

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

  504.                 service->pcr_packet_period =

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

  506.             } else {

  507.                 service->pcr_packet_period =

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

  509.             }

  510.         } else {

  511.             // max delta PCR 0.1s

  512.             service->pcr_packet_period =

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

  514.         }

  515.     }

  516. 

  517.     // output a PCR as soon as possible

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

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

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

  521. 

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

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

  524.     else

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

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

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

  528.            service->pcr_packet_period,

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

  530. 

  531.     put_flush_packet(s->pb);

  532. 

  533.     return 0;

  534. 

  535.  fail:

  536.     av_free(pids);

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

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

  539.         av_free(st->priv_data);

  540.     }

  541.     return -1;

  542. }

  543. 

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

  545. static void retransmit_si_info(AVFormatContext *s)

  546. {

  547.     MpegTSWrite *ts = s->priv_data;

  548.     int i;

  549. 

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

  551.         ts->sdt_packet_count = 0;

  552.         mpegts_write_sdt(s);

  553.     }

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

  555.         ts->pat_packet_count = 0;

  556.         mpegts_write_pat(s);

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

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

  559.         }

  560.     }

  561. }

  562. 

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

  564. {

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

  566.            ts->first_pcr;

  567. }

  568. 

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

  570. {

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

  572. 

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

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

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

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

  577.     *buf++ = ((pcr_high & 1) << 7) | (pcr_low >> 8);

  578.     *buf++ = pcr_low;

  579. 

  580.     return buf;

  581. }

  582. 

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

  584. static void mpegts_insert_null_packet(AVFormatContext *s)

  585. {

  586.     MpegTSWrite *ts = s->priv_data;

  587.     uint8_t *q;

  588.     uint8_t buf[TS_PACKET_SIZE];

  589. 

  590.     q = buf;

  591.     *q++ = 0x47;

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

  593.     *q++ = 0xff;

  594.     *q++ = 0x10;

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

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

  597. }

  598. 

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

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

  601. {

  602.     MpegTSWrite *ts = s->priv_data;

  603.     MpegTSWriteStream *ts_st = st->priv_data;

  604.     uint8_t *q;

  605.     uint8_t buf[TS_PACKET_SIZE];

  606. 

  607.     q = buf;

  608.     *q++ = 0x47;

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

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

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

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

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

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

  615. 

  616.     /* PCR coded into 6 bytes */

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

  618. 

  619.     /* stuffing bytes */

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

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

  622. }

  623. 

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

  625. {

  626.     int val;

  627. 

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

  629.     *q++ = val;

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

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

  632.     *q++ = val;

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

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

  635.     *q++ = val;

  636. }

  637. 

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

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

  640.  * to exactly fill the last ts packet.

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

  642.  */

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

  644.                              const uint8_t *payload, int payload_size,

  645.                              int64_t pts, int64_t dts)

  646. {

  647.     MpegTSWriteStream *ts_st = st->priv_data;

  648.     MpegTSWrite *ts = s->priv_data;

  649.     uint8_t buf[TS_PACKET_SIZE];

  650.     uint8_t *q;

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

  652.     int afc_len, stuffing_len;

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

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

  655. 

  656.     is_start = 1;

  657.     while (payload_size > 0) {

  658.         retransmit_si_info(s);

  659. 

  660.         write_pcr = 0;

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

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

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

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

  665.                 ts_st->service->pcr_packet_period) {

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

  667.                 write_pcr = 1;

  668.             }

  669.         }

  670. 

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

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

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

  674.             if (write_pcr)

  675.                 mpegts_insert_pcr_only(s, st);

  676.             else

  677.                 mpegts_insert_null_packet(s);

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

  679.         }

  680. 

  681.         /* prepare packet header */

  682.         q = buf;

  683.         *q++ = 0x47;

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

  685.         if (is_start)

  686.             val |= 0x40;

  687.         *q++ = val;

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

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

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

  691.         if (write_pcr) {

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

  693.             if (ts->mux_rate > 1)

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

  695.             else

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

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

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

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

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

  701.             q = write_pcr_bits(q, pcr);

  702.         }

  703.         if (is_start) {

  704.             int pes_extension = 0;

  705.             /* write PES header */

  706.             *q++ = 0x00;

  707.             *q++ = 0x00;

  708.             *q++ = 0x01;

  709.             private_code = 0;

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

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

  712.                     *q++ = 0xfd;

  713.                 } else

  714.                     *q++ = 0xe0;

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

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

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

  718.                 *q++ = 0xc0;

  719.             } else {

  720.                 *q++ = 0xbd;

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

  722.                     private_code = 0x20;

  723.                 }

  724.             }

  725.             header_len = 0;

  726.             flags = 0;

  727.             if (pts != AV_NOPTS_VALUE) {

  728.                 header_len += 5;

  729.                 flags |= 0x80;

  730.             }

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

  732.                 header_len += 5;

  733.                 flags |= 0x40;

  734.             }

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

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

  737.                 /* set PES_extension_flag */

  738.                 pes_extension = 1;

  739.                 flags |= 0x01;

  740. 

  741.                 /*

  742.                 * One byte for PES2 extension flag +

  743.                 * one byte for extension length +

  744.                 * one byte for extension id

  745.                 */

  746.                 header_len += 3;

  747.             }

  748.             len = payload_size + header_len + 3;

  749.             if (private_code != 0)

  750.                 len++;

  751.             if (len > 0xffff)

  752.                 len = 0;

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

  754.             *q++ = len;

  755.             val = 0x80;

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

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

  758.                 val |= 0x04;

  759.             *q++ = val;

  760.             *q++ = flags;

  761.             *q++ = header_len;

  762.             if (pts != AV_NOPTS_VALUE) {

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

  764.                 q += 5;

  765.             }

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

  767.                 write_pts(q, 1, dts);

  768.                 q += 5;

  769.             }

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

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

  772.                 *q++ = flags;

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

  774.                 /*

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

  776.                 * write the extended stream id

  777.                 */

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

  779.             }

  780.             if (private_code != 0)

  781.                 *q++ = private_code;

  782.             is_start = 0;

  783.         }

  784.         /* header size */

  785.         header_len = q - buf;

  786.         /* data len */

  787.         len = TS_PACKET_SIZE - header_len;

  788.         if (len > payload_size)

  789.             len = payload_size;

  790.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  791.         if (stuffing_len > 0) {

  792.             /* add stuffing with AFC */

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

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

  795.                 afc_len = buf[4] + 1;

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

  797.                         buf + 4 + afc_len,

  798.                         header_len - (4 + afc_len));

  799.                 buf[4] += stuffing_len;

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

  801.             } else {

  802.                 /* add stuffing */

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

  804.                 buf[3] |= 0x20;

  805.                 buf[4] = stuffing_len - 1;

  806.                 if (stuffing_len >= 2) {

  807.                     buf[5] = 0x00;

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

  809.                 }

  810.             }

  811.         }

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

  813.         payload += len;

  814.         payload_size -= len;

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

  816.     }

  817.     put_flush_packet(s->pb);

  818. }

  819. 

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

  821. {

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

  823.     int size = pkt->size;

  824.     uint8_t *buf= pkt->data;

  825.     uint8_t *data= NULL;

  826.     MpegTSWriteStream *ts_st = st->priv_data;

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

  828.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  829. 

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

  831.         pts = pkt->pts + delay;

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

  833.         dts = pkt->dts + delay;

  834. 

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

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

  837.         return -1;

  838.     }

  839.     ts_st->first_pts_check = 0;

  840. 

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

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

  843.         uint32_t state = -1;

  844. 

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

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

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

  848.             return -1;

  849.         }

  850. 

  851.         do {

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

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

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

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

  856. 

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

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

  859.             if (!data)

  860.                 return -1;

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

  862.             AV_WB32(data, 0x00000001);

  863.             data[4] = 0x09;

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

  865.             buf  = data;

  866.             size = pkt->size+6;

  867.         }

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

  869.         if (pkt->size < 2)

  870.             return -1;

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

  872.             ADTSContext *adts = ts_st->adts;

  873.             int new_size;

  874.             if (!adts) {

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

  876.                        "and extradata missing\n");

  877.                 return -1;

  878.             }

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

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

  881.                 return -1;

  882.             data = av_malloc(new_size);

  883.             if (!data)

  884.                 return AVERROR(ENOMEM);

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

  886.             if (adts->pce_size) {

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

  888.                 adts->pce_size = 0;

  889.             }

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

  891.             buf = data;

  892.             size = new_size;

  893.         }

  894.     }

  895. 

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

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

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

  899.         av_free(data);

  900.         return 0;

  901.     }

  902. 

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

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

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

  906.         ts_st->payload_index = 0;

  907.     }

  908. 

  909.     if (!ts_st->payload_index) {

  910.         ts_st->payload_pts = pts;

  911.         ts_st->payload_dts = dts;

  912.     }

  913. 

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

  915.     ts_st->payload_index += size;

  916. 

  917.     av_free(data);

  918. 

  919.     return 0;

  920. }

  921. 

  922. static int mpegts_write_end(AVFormatContext *s)

  923. {

  924.     MpegTSWrite *ts = s->priv_data;

  925.     MpegTSWriteStream *ts_st;

  926.     MpegTSService *service;

  927.     AVStream *st;

  928.     int i;

  929. 

  930.     /* flush current packets */

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

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

  933.         ts_st = st->priv_data;

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

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

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

  937.         }

  938.         av_freep(&ts_st->adts);

  939.     }

  940.     put_flush_packet(s->pb);

  941. 

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

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

  944.         av_freep(&service->provider_name);

  945.         av_freep(&service->name);

  946.         av_free(service);

  947.     }

  948.     av_free(ts->services);

  949. 

  950.     return 0;

  951. }

  952. 

  953. AVOutputFormat mpegts_muxer = {

  954.     "mpegts",

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

  956.     "video/x-mpegts",

  957.     "ts,m2t",

  958.     sizeof(MpegTSWrite),

  959.     CODEC_ID_MP2,

  960.     CODEC_ID_MPEG2VIDEO,

  961.     mpegts_write_header,

  962.     mpegts_write_packet,

  963.     mpegts_write_end,

  964. };