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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 "libavutil/dict.h"

  25. #include "libavutil/mathematics.h"

  26. #include "libavutil/opt.h"

  27. #include "libavutil/avassert.h"

  28. #include "libavcodec/mpegvideo.h"

  29. #include "avformat.h"

  30. #include "internal.h"

  31. #include "mpegts.h"

  32. #include "adts.h"

  33. 

  34. #define PCR_TIME_BASE 27000000

  35. 

  36. /* write DVB SI sections */

  37. 

  38. /*********************************************/

  39. /* mpegts section writer */

  40. 

  41. typedef struct MpegTSSection {

  42.     int pid;

  43.     int cc;

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

  45.     void *opaque;

  46. } MpegTSSection;

  47. 

  48. typedef struct MpegTSService {

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

  50.     int sid;           /* service ID */

  51.     char *name;

  52.     char *provider_name;

  53.     int pcr_pid;

  54.     int pcr_packet_count;

  55.     int pcr_packet_period;

  56. } MpegTSService;

  57. 

  58. typedef struct MpegTSWrite {

  59.     const AVClass *av_class;

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

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

  62.     MpegTSService **services;

  63.     int sdt_packet_count;

  64.     int sdt_packet_period;

  65.     int pat_packet_count;

  66.     int pat_packet_period;

  67.     int nb_services;

  68.     int onid;

  69.     int tsid;

  70.     int64_t first_pcr;

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

  72.     int pes_payload_size;

  73. 

  74.     int transport_stream_id;

  75.     int original_network_id;

  76.     int service_id;

  77. 

  78.     int pmt_start_pid;

  79.     int start_pid;

  80.     int m2ts_mode;

  81. 

  82.     int reemit_pat_pmt;

  83. } MpegTSWrite;

  84. 

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

  86. #define DEFAULT_PES_HEADER_FREQ 16

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

  88. 

  89. static const AVOption options[] = {

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

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

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

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

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

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

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

  97.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

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

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

  100.     {"mpegts_m2ts_mode", "Enable m2ts mode.",

  101.         offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.dbl = -1 },

  102.         -1,1, AV_OPT_FLAG_ENCODING_PARAM},

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

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

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

  106.     { "resend_headers", "Reemit PAT/PMT before writing the next packet",

  107.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  108.     { NULL },

  109. };

  110. 

  111. static const AVClass mpegts_muxer_class = {

  112.     .class_name     = "MPEGTS muxer",

  113.     .item_name      = av_default_item_name,

  114.     .option         = options,

  115.     .version        = LIBAVUTIL_VERSION_INT,

  116. };

  117. 

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

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

  120. {

  121.     unsigned int crc;

  122.     unsigned char packet[TS_PACKET_SIZE];

  123.     const unsigned char *buf_ptr;

  124.     unsigned char *q;

  125.     int first, b, len1, left;

  126. 

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

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

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

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

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

  132. 

  133.     /* send each packet */

  134.     buf_ptr = buf;

  135.     while (len > 0) {

  136.         first = (buf == buf_ptr);

  137.         q = packet;

  138.         *q++ = 0x47;

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

  140.         if (first)

  141.             b |= 0x40;

  142.         *q++ = b;

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

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

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

  146.         if (first)

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

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

  149.         if (len1 > len)

  150.             len1 = len;

  151.         memcpy(q, buf_ptr, len1);

  152.         q += len1;

  153.         /* add known padding data */

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

  155.         if (left > 0)

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

  157. 

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

  159. 

  160.         buf_ptr += len1;

  161.         len -= len1;

  162.     }

  163. }

  164. 

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

  166. {

  167.     uint8_t *q;

  168.     q = *q_ptr;

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

  170.     *q++ = val;

  171.     *q_ptr = q;

  172. }

  173. 

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

  175.                           int version, int sec_num, int last_sec_num,

  176.                           uint8_t *buf, int len)

  177. {

  178.     uint8_t section[1024], *q;

  179.     unsigned int tot_len;

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

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

  182. 

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

  184.     /* check if not too big */

  185.     if (tot_len > 1024)

  186.         return AVERROR_INVALIDDATA;

  187. 

  188.     q = section;

  189.     *q++ = tid;

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

  191.     put16(&q, id);

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

  193.     *q++ = sec_num;

  194.     *q++ = last_sec_num;

  195.     memcpy(q, buf, len);

  196. 

  197.     mpegts_write_section(s, section, tot_len);

  198.     return 0;

  199. }

  200. 

  201. /*********************************************/

  202. /* mpegts writer */

  203. 

  204. #define DEFAULT_PROVIDER_NAME   "FFmpeg"

  205. #define DEFAULT_SERVICE_NAME    "Service01"

  206. 

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

  208. #define SDT_RETRANS_TIME 500

  209. #define PAT_RETRANS_TIME 100

  210. #define PCR_RETRANS_TIME 20

  211. 

  212. typedef struct MpegTSWriteStream {

  213.     struct MpegTSService *service;

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

  215.     int cc;

  216.     int payload_size;

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

  218.     int prev_payload_key;

  219.     int64_t payload_pts;

  220.     int64_t payload_dts;

  221.     int payload_flags;

  222.     uint8_t *payload;

  223.     ADTSContext *adts;

  224. } MpegTSWriteStream;

  225. 

  226. static void mpegts_write_pat(AVFormatContext *s)

  227. {

  228.     MpegTSWrite *ts = s->priv_data;

  229.     MpegTSService *service;

  230.     uint8_t data[1012], *q;

  231.     int i;

  232. 

  233.     q = data;

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

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

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

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

  238.     }

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

  240.                           data, q - data);

  241. }

  242. 

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

  244. {

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

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

  247.     int val, stream_type, i;

  248. 

  249.     q = data;

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

  251. 

  252.     program_info_length_ptr = q;

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

  254. 

  255.     /* put program info here */

  256. 

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

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

  259.     program_info_length_ptr[1] = val;

  260. 

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

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

  263.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  266.         case CODEC_ID_MPEG1VIDEO:

  267.         case CODEC_ID_MPEG2VIDEO:

  268.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  269.             break;

  270.         case CODEC_ID_MPEG4:

  271.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  272.             break;

  273.         case CODEC_ID_H264:

  274.             stream_type = STREAM_TYPE_VIDEO_H264;

  275.             break;

  276.         case CODEC_ID_DIRAC:

  277.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  278.             break;

  279.         case CODEC_ID_MP2:

  280.         case CODEC_ID_MP3:

  281.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  282.             break;

  283.         case CODEC_ID_AAC:

  284.             stream_type = STREAM_TYPE_AUDIO_AAC;

  285.             break;

  286.         case CODEC_ID_AAC_LATM:

  287.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  288.             break;

  289.         case CODEC_ID_AC3:

  290.             stream_type = STREAM_TYPE_AUDIO_AC3;

  291.             break;

  292.         default:

  293.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  294.             break;

  295.         }

  296.         *q++ = stream_type;

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

  298.         desc_length_ptr = q;

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

  300. 

  301.         /* write optional descriptors here */

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

  303.         case AVMEDIA_TYPE_AUDIO:

  304.             if(st->codec->codec_id==CODEC_ID_EAC3){

  305.                 *q++=0x7a; // EAC3 descriptor see A038 DVB SI

  306.                 *q++=1; // 1 byte, all flags sets to 0

  307.                 *q++=0; // omit all fields...

  308.             }

  309.             if(st->codec->codec_id==CODEC_ID_S302M){

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

  311.                 *q++ = 4;

  312.                 *q++ = 'B';

  313.                 *q++ = 'S';

  314.                 *q++ = 'S';

  315.                 *q++ = 'D';

  316.             }

  317. 

  318.             if (lang) {

  319.                 char *p;

  320.                 char *next = lang->value;

  321.                 uint8_t *len_ptr;

  322. 

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

  324.                 len_ptr = q++;

  325.                 *len_ptr = 0;

  326. 

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

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

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

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

  331. 

  332.                     *q++ = *p++;

  333.                     *q++ = *p++;

  334.                     *q++ = *p++;

  335. 

  336.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  337.                     *q++ = 0x01;

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

  339.                     *q++ = 0x02;

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

  341.                     *q++ = 0x03;

  342.                 else

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

  344. 

  345.                     *len_ptr += 4;

  346.                 }

  347. 

  348.                 if (*len_ptr == 0)

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

  350.             }

  351.             break;

  352.         case AVMEDIA_TYPE_SUBTITLE:

  353.             {

  354.                 const char *language;

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

  356.                 *q++ = 0x59;

  357.                 *q++ = 8;

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

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

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

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

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

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

  364.                     q += 4;

  365.                 } else {

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

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

  368.                 }

  369.             }

  370.             break;

  371.         case AVMEDIA_TYPE_VIDEO:

  372.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  374.                 *q++ = 4;

  375.                 *q++ = 'd';

  376.                 *q++ = 'r';

  377.                 *q++ = 'a';

  378.                 *q++ = 'c';

  379.             }

  380.             break;

  381.         }

  382. 

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

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

  385.         desc_length_ptr[1] = val;

  386.     }

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

  388.                           data, q - data);

  389. }

  390. 

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

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

  393. {

  394.     uint8_t *q;

  395.     int len;

  396. 

  397.     q = *q_ptr;

  398.     if (!str)

  399.         len = 0;

  400.     else

  401.         len = strlen(str);

  402.     *q++ = len;

  403.     memcpy(q, str, len);

  404.     q += len;

  405.     *q_ptr = q;

  406. }

  407. 

  408. static void mpegts_write_sdt(AVFormatContext *s)

  409. {

  410.     MpegTSWrite *ts = s->priv_data;

  411.     MpegTSService *service;

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

  413.     int i, running_status, free_ca_mode, val;

  414. 

  415.     q = data;

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

  417.     *q++ = 0xff;

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

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

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

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

  422.         desc_list_len_ptr = q;

  423.         q += 2;

  424.         running_status = 4; /* running */

  425.         free_ca_mode = 0;

  426. 

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

  428.         *q++ = 0x48;

  429.         desc_len_ptr = q;

  430.         q++;

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

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

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

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

  435. 

  436.         /* fill descriptor length */

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

  438.             (q - desc_list_len_ptr - 2);

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

  440.         desc_list_len_ptr[1] = val;

  441.     }

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

  443.                           data, q - data);

  444. }

  445. 

  446. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  447.                                          int sid,

  448.                                          const char *provider_name,

  449.                                          const char *name)

  450. {

  451.     MpegTSService *service;

  452. 

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

  454.     if (!service)

  455.         return NULL;

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

  457.     service->sid = sid;

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

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

  460.     service->pcr_pid = 0x1fff;

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

  462.     return service;

  463. }

  464. 

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

  466. {

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

  468.            ts->first_pcr;

  469. }

  470. 

  471. static void mpegts_prefix_m2ts_header(AVFormatContext *s)

  472. {

  473.     MpegTSWrite *ts = s->priv_data;

  474.     if (ts->m2ts_mode) {

  475.         int64_t pcr = get_pcr(s->priv_data, s->pb);

  476.         uint32_t tp_extra_header = pcr % 0x3fffffff;

  477.         tp_extra_header = AV_RB32(&tp_extra_header);

  478.         avio_write(s->pb, (unsigned char *) &tp_extra_header,

  479.                 sizeof(tp_extra_header));

  480.     }

  481. }

  482. 

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

  484. {

  485.     AVFormatContext *ctx = s->opaque;

  486.     mpegts_prefix_m2ts_header(ctx);

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

  488. }

  489. 

  490. static int mpegts_write_header(AVFormatContext *s)

  491. {

  492.     MpegTSWrite *ts = s->priv_data;

  493.     MpegTSWriteStream *ts_st;

  494.     MpegTSService *service;

  495.     AVStream *st, *pcr_st = NULL;

  496.     AVDictionaryEntry *title, *provider;

  497.     int i, j;

  498.     const char *service_name;

  499.     const char *provider_name;

  500.     int *pids;

  501. 

  502.     if (s->max_delay < 0) /* Not set by the caller */

  503.         s->max_delay = 0;

  504. 

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

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

  507. 

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

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

  510.     /* allocate a single DVB service */

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

  512.     if (!title)

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

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

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

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

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

  518.     service->pmt.write_packet = section_write_packet;

  519.     service->pmt.opaque = s;

  520.     service->pmt.cc = 15;

  521. 

  522.     ts->pat.pid = PAT_PID;

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

  524.     ts->pat.write_packet = section_write_packet;

  525.     ts->pat.opaque = s;

  526. 

  527.     ts->sdt.pid = SDT_PID;

  528.     ts->sdt.cc = 15;

  529.     ts->sdt.write_packet = section_write_packet;

  530.     ts->sdt.opaque = s;

  531. 

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

  533.     if (!pids)

  534.         return AVERROR(ENOMEM);

  535. 

  536.     /* assign pids to each stream */

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

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

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

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

  541.         if (!ts_st)

  542.             goto fail;

  543.         st->priv_data = ts_st;

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

  545.         if (!ts_st->payload)

  546.             goto fail;

  547.         ts_st->service = service;

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

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

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

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

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

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

  554.         } else {

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

  556.             goto fail;

  557.         }

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

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

  560.             goto fail;

  561.         }

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

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

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

  565.                 goto fail;

  566.             }

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

  568.         ts_st->payload_pts = AV_NOPTS_VALUE;

  569.         ts_st->payload_dts = AV_NOPTS_VALUE;

  570.         ts_st->first_pts_check = 1;

  571.         ts_st->cc = 15;

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

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

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

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

  576.             pcr_st = st;

  577.         }

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

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

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

  581.             if (!ts_st->adts)

  582.                 goto fail;

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

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

  585.                 goto fail;

  586.         }

  587.     }

  588. 

  589.     av_free(pids);

  590. 

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

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

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

  594.         ts_st = pcr_st->priv_data;

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

  596.     }

  597. 

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

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

  600.             (TS_PACKET_SIZE * 8 * 1000);

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

  602.             (TS_PACKET_SIZE * 8 * 1000);

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

  604.             (TS_PACKET_SIZE * 8 * 1000);

  605. 

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

  607.     } else {

  608.         /* Arbitrary values, PAT/PMT will also be written on video key frames */

  609.         ts->sdt_packet_period = 200;

  610.         ts->pat_packet_period = 40;

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

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

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

  614.                 service->pcr_packet_period =

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

  616.             } else {

  617.                 service->pcr_packet_period =

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

  619.             }

  620.         } else {

  621.             // max delta PCR 0.1s

  622.             service->pcr_packet_period =

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

  624.         }

  625.     }

  626. 

  627.     // output a PCR as soon as possible

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

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

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

  631. 

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

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

  634.     else

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

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

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

  638.            service->pcr_packet_period,

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

  640. 

  641.     if (ts->m2ts_mode == -1) {

  642.         if (av_match_ext(s->filename, "m2ts")) {

  643.             ts->m2ts_mode = 1;

  644.         } else {

  645.             ts->m2ts_mode = 0;

  646.         }

  647.     }

  648. 

  649.     avio_flush(s->pb);

  650. 

  651.     return 0;

  652. 

  653.  fail:

  654.     av_free(pids);

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

  656.         MpegTSWriteStream *ts_st;

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

  658.         ts_st = st->priv_data;

  659.         if (ts_st) {

  660.             av_freep(&ts_st->payload);

  661.             av_freep(&ts_st->adts);

  662.         }

  663.         av_freep(&st->priv_data);

  664.     }

  665.     return AVERROR(EINVAL);

  666. }

  667. 

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

  669. static void retransmit_si_info(AVFormatContext *s, int force_pat)

  670. {

  671.     MpegTSWrite *ts = s->priv_data;

  672.     int i;

  673. 

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

  675.         ts->sdt_packet_count = 0;

  676.         mpegts_write_sdt(s);

  677.     }

  678.     if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {

  679.         ts->pat_packet_count = 0;

  680.         mpegts_write_pat(s);

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

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

  683.         }

  684.     }

  685. }

  686. 

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

  688. {

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

  690. 

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

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

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

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

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

  696.     *buf++ = pcr_low;

  697. 

  698.     return 6;

  699. }

  700. 

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

  702. static void mpegts_insert_null_packet(AVFormatContext *s)

  703. {

  704.     uint8_t *q;

  705.     uint8_t buf[TS_PACKET_SIZE];

  706. 

  707.     q = buf;

  708.     *q++ = 0x47;

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

  710.     *q++ = 0xff;

  711.     *q++ = 0x10;

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

  713.     mpegts_prefix_m2ts_header(s);

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

  715. }

  716. 

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

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

  719. {

  720.     MpegTSWrite *ts = s->priv_data;

  721.     MpegTSWriteStream *ts_st = st->priv_data;

  722.     uint8_t *q;

  723.     uint8_t buf[TS_PACKET_SIZE];

  724. 

  725.     q = buf;

  726.     *q++ = 0x47;

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

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

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

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

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

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

  733. 

  734.     /* PCR coded into 6 bytes */

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

  736. 

  737.     /* stuffing bytes */

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

  739.     mpegts_prefix_m2ts_header(s);

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

  741. }

  742. 

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

  744. {

  745.     int val;

  746. 

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

  748.     *q++ = val;

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

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

  751.     *q++ = val;

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

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

  754.     *q++ = val;

  755. }

  756. 

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

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

  759. {

  760.     // expect at least one flag to set

  761.     assert(flag);

  762. 

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

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

  765.         pkt[3] |= 0x20;

  766.         // 1 byte length, no flags

  767.         pkt[4] = 1;

  768.         pkt[5] = 0;

  769.     }

  770.     pkt[5] |= flag;

  771. }

  772. 

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

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

  775. {

  776.     // expect already existing adaptation field

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

  778.     pkt[4] += size;

  779. }

  780. 

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

  782. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  783. {

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

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

  786.     else

  787.         return pkt + 4;

  788. }

  789. 

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

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

  792.  * to exactly fill the last ts packet.

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

  794.  */

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

  796.                              const uint8_t *payload, int payload_size,

  797.                              int64_t pts, int64_t dts, int key)

  798. {

  799.     MpegTSWriteStream *ts_st = st->priv_data;

  800.     MpegTSWrite *ts = s->priv_data;

  801.     uint8_t buf[TS_PACKET_SIZE];

  802.     uint8_t *q;

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

  804.     int afc_len, stuffing_len;

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

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

  807.     int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;

  808. 

  809.     is_start = 1;

  810.     while (payload_size > 0) {

  811.         retransmit_si_info(s, force_pat);

  812.         force_pat = 0;

  813. 

  814.         write_pcr = 0;

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

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

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

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

  819.                 ts_st->service->pcr_packet_period) {

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

  821.                 write_pcr = 1;

  822.             }

  823.         }

  824. 

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

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

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

  828.             if (write_pcr)

  829.                 mpegts_insert_pcr_only(s, st);

  830.             else

  831.                 mpegts_insert_null_packet(s);

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

  833.         }

  834. 

  835.         /* prepare packet header */

  836.         q = buf;

  837.         *q++ = 0x47;

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

  839.         if (is_start)

  840.             val |= 0x40;

  841.         *q++ = val;

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

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

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

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

  846.             // set Random Access for key frames

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

  848.                 write_pcr = 1;

  849.             set_af_flag(buf, 0x40);

  850.             q = get_ts_payload_start(buf);

  851.         }

  852.         if (write_pcr) {

  853.             set_af_flag(buf, 0x10);

  854.             q = get_ts_payload_start(buf);

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

  856.             if (ts->mux_rate > 1)

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

  858.             else

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

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

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

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

  863.             q = get_ts_payload_start(buf);

  864.         }

  865.         if (is_start) {

  866.             int pes_extension = 0;

  867.             /* write PES header */

  868.             *q++ = 0x00;

  869.             *q++ = 0x00;

  870.             *q++ = 0x01;

  871.             private_code = 0;

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

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

  874.                     *q++ = 0xfd;

  875.                 } else

  876.                     *q++ = 0xe0;

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

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

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

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

  881.                 *q++ = 0xc0;

  882.             } else {

  883.                 *q++ = 0xbd;

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

  885.                     private_code = 0x20;

  886.                 }

  887.             }

  888.             header_len = 0;

  889.             flags = 0;

  890.             if (pts != AV_NOPTS_VALUE) {

  891.                 header_len += 5;

  892.                 flags |= 0x80;

  893.             }

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

  895.                 header_len += 5;

  896.                 flags |= 0x40;

  897.             }

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

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

  900.                 /* set PES_extension_flag */

  901.                 pes_extension = 1;

  902.                 flags |= 0x01;

  903. 

  904.                 /*

  905.                 * One byte for PES2 extension flag +

  906.                 * one byte for extension length +

  907.                 * one byte for extension id

  908.                 */

  909.                 header_len += 3;

  910.             }

  911.             len = payload_size + header_len + 3;

  912.             if (private_code != 0)

  913.                 len++;

  914.             if (len > 0xffff)

  915.                 len = 0;

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

  917.             *q++ = len;

  918.             val = 0x80;

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

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

  921.                 val |= 0x04;

  922.             *q++ = val;

  923.             *q++ = flags;

  924.             *q++ = header_len;

  925.             if (pts != AV_NOPTS_VALUE) {

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

  927.                 q += 5;

  928.             }

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

  930.                 write_pts(q, 1, dts);

  931.                 q += 5;

  932.             }

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

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

  935.                 *q++ = flags;

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

  937.                 /*

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

  939.                 * write the extended stream id

  940.                 */

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

  942.             }

  943.             if (private_code != 0)

  944.                 *q++ = private_code;

  945.             is_start = 0;

  946.         }

  947.         /* header size */

  948.         header_len = q - buf;

  949.         /* data len */

  950.         len = TS_PACKET_SIZE - header_len;

  951.         if (len > payload_size)

  952.             len = payload_size;

  953.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  954.         if (stuffing_len > 0) {

  955.             /* add stuffing with AFC */

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

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

  958.                 afc_len = buf[4] + 1;

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

  960.                         buf + 4 + afc_len,

  961.                         header_len - (4 + afc_len));

  962.                 buf[4] += stuffing_len;

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

  964.             } else {

  965.                 /* add stuffing */

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

  967.                 buf[3] |= 0x20;

  968.                 buf[4] = stuffing_len - 1;

  969.                 if (stuffing_len >= 2) {

  970.                     buf[5] = 0x00;

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

  972.                 }

  973.             }

  974.         }

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

  976.         payload += len;

  977.         payload_size -= len;

  978.         mpegts_prefix_m2ts_header(s);

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

  980.     }

  981.     avio_flush(s->pb);

  982.     ts_st->prev_payload_key = key;

  983. }

  984. 

  985. static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)

  986. {

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

  988.     int size = pkt->size;

  989.     uint8_t *buf= pkt->data;

  990.     uint8_t *data= NULL;

  991.     MpegTSWrite *ts = s->priv_data;

  992.     MpegTSWriteStream *ts_st = st->priv_data;

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

  994.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  995. 

  996.     if (ts->reemit_pat_pmt) {

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

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

  999.         ts->reemit_pat_pmt = 0;

  1000.     }

  1001. 

  1002.     if (pkt->pts != AV_NOPTS_VALUE)

  1003.         pts = pkt->pts + delay;

  1004.     if (pkt->dts != AV_NOPTS_VALUE)

  1005.         dts = pkt->dts + delay;

  1006. 

  1007.     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {

  1008.         av_log(s, AV_LOG_ERROR, "first pts value must set\n");

  1009.         return AVERROR_INVALIDDATA;

  1010.     }

  1011.     ts_st->first_pts_check = 0;

  1012. 

  1013.     if (st->codec->codec_id == CODEC_ID_H264) {

  1014.         const uint8_t *p = buf, *buf_end = p+size;

  1015.         uint32_t state = -1;

  1016. 

  1017.         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {

  1018.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "

  1019.                    "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");

  1020.             return AVERROR_INVALIDDATA;

  1021.         }

  1022. 

  1023.         do {

  1024.             p = avpriv_mpv_find_start_code(p, buf_end, &state);

  1025.             //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);

  1026.         } while (p < buf_end && (state & 0x1f) != 9 &&

  1027.                  (state & 0x1f) != 5 && (state & 0x1f) != 1);

  1028. 

  1029.         if ((state & 0x1f) != 9) { // AUD NAL

  1030.             data = av_malloc(pkt->size+6);

  1031.             if (!data)

  1032.                 return AVERROR(ENOMEM);

  1033.             memcpy(data+6, pkt->data, pkt->size);

  1034.             AV_WB32(data, 0x00000001);

  1035.             data[4] = 0x09;

  1036.             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit

  1037.             buf  = data;

  1038.             size = pkt->size+6;

  1039.         }

  1040.     } else if (st->codec->codec_id == CODEC_ID_AAC) {

  1041.         if (pkt->size < 2)

  1042.             return AVERROR_INVALIDDATA;

  1043.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {

  1044.             ADTSContext *adts = ts_st->adts;

  1045.             int new_size, err;

  1046.             if (!adts) {

  1047.                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "

  1048.                        "and extradata missing\n");

  1049.                 return AVERROR_INVALIDDATA;

  1050.             }

  1051.             new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;

  1052.             if ((unsigned)new_size >= INT_MAX)

  1053.                 return AVERROR_INVALIDDATA;

  1054.             data = av_malloc(new_size);

  1055.             if (!data)

  1056.                 return AVERROR(ENOMEM);

  1057.             err = ff_adts_write_frame_header(adts, data, pkt->size,

  1058.                                              adts->pce_size);

  1059.             if (err < 0) {

  1060.                 av_free(data);

  1061.                 return err;

  1062.             }

  1063.             if (adts->pce_size) {

  1064.                 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);

  1065.                 adts->pce_size = 0;

  1066.             }

  1067.             memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);

  1068.             buf = data;

  1069.             size = new_size;

  1070.         }

  1071.     }

  1072. 

  1073.     if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {

  1074.         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1075.                          ts_st->payload_pts, ts_st->payload_dts,

  1076.                          ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1077.         ts_st->payload_size = 0;

  1078.     }

  1079. 

  1080.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {

  1081.         av_assert0(!ts_st->payload_size);

  1082.         // for video and subtitle, write a single pes packet

  1083.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1084.         av_free(data);

  1085.         return 0;

  1086.     }

  1087. 

  1088.     if (!ts_st->payload_size) {

  1089.         ts_st->payload_pts = pts;

  1090.         ts_st->payload_dts = dts;

  1091.         ts_st->payload_flags = pkt->flags;

  1092.     }

  1093. 

  1094.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1095.     ts_st->payload_size += size;

  1096. 

  1097.     av_free(data);

  1098. 

  1099.     return 0;

  1100. }

  1101. 

  1102. static void mpegts_write_flush(AVFormatContext *s)

  1103. {

  1104.     int i;

  1105. 

  1106.     /* flush current packets */

  1107.     for(i = 0; i < s->nb_streams; i++) {

  1108.         AVStream *st = s->streams[i];

  1109.         MpegTSWriteStream *ts_st = st->priv_data;

  1110.         if (ts_st->payload_size > 0) {

  1111.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1112.                              ts_st->payload_pts, ts_st->payload_dts,

  1113.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1114.             ts_st->payload_size = 0;

  1115.         }

  1116.     }

  1117.     avio_flush(s->pb);

  1118. }

  1119. 

  1120. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)

  1121. {

  1122.     if (!pkt) {

  1123.         mpegts_write_flush(s);

  1124.         return 1;

  1125.     } else {

  1126.         return mpegts_write_packet_internal(s, pkt);

  1127.     }

  1128. }

  1129. 

  1130. static int mpegts_write_end(AVFormatContext *s)

  1131. {

  1132.     MpegTSWrite *ts = s->priv_data;

  1133.     MpegTSService *service;

  1134.     int i;

  1135. 

  1136.     mpegts_write_flush(s);

  1137. 

  1138.     for(i = 0; i < s->nb_streams; i++) {

  1139.         AVStream *st = s->streams[i];

  1140.         MpegTSWriteStream *ts_st = st->priv_data;

  1141.         av_freep(&ts_st->payload);

  1142.         av_freep(&ts_st->adts);

  1143.     }

  1144. 

  1145.     for(i = 0; i < ts->nb_services; i++) {

  1146.         service = ts->services[i];

  1147.         av_freep(&service->provider_name);

  1148.         av_freep(&service->name);

  1149.         av_free(service);

  1150.     }

  1151.     av_free(ts->services);

  1152. 

  1153.     return 0;

  1154. }

  1155. 

  1156. AVOutputFormat ff_mpegts_muxer = {

  1157.     .name              = "mpegts",

  1158.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),

  1159.     .mime_type         = "video/x-mpegts",

  1160.     .extensions        = "ts,m2t,m2ts,mts",

  1161.     .priv_data_size    = sizeof(MpegTSWrite),

  1162.     .audio_codec       = CODEC_ID_MP2,

  1163.     .video_codec       = CODEC_ID_MPEG2VIDEO,

  1164.     .write_header      = mpegts_write_header,

  1165.     .write_packet      = mpegts_write_packet,

  1166.     .write_trailer     = mpegts_write_end,

  1167.     .flags             = AVFMT_ALLOW_FLUSH,

  1168.     .priv_class        = &mpegts_muxer_class,

  1169. };