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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/intreadwrite.h"

  26. #include "libavutil/mathematics.h"

  27. #include "libavutil/opt.h"

  28. #include "libavcodec/internal.h"

  29. #include "avformat.h"

  30. #include "internal.h"

  31. #include "mpegts.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. 

  80.     int reemit_pat_pmt; // backward compatibility

  81. 

  82. #define MPEGTS_FLAG_REEMIT_PAT_PMT  0x01

  83. #define MPEGTS_FLAG_AAC_LATM        0x02

  84.     int flags;

  85. } MpegTSWrite;

  86. 

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

  88. #define DEFAULT_PES_HEADER_FREQ 16

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

  90. 

  91. static const AVOption options[] = {

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

  93.       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  95.       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  97.       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},

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

  99.       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},

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

  101.       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},

  102.     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

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

  104.       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  105.     { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,

  106.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },

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

  108.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,

  109.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},

  110.     { "latm", "Use LATM packetization for AAC",

  111.       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,

  112.       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},

  113.     // backward compatibility

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

  115.       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

  116.     { NULL },

  117. };

  118. 

  119. static const AVClass mpegts_muxer_class = {

  120.     .class_name     = "MPEGTS muxer",

  121.     .item_name      = av_default_item_name,

  122.     .option         = options,

  123.     .version        = LIBAVUTIL_VERSION_INT,

  124. };

  125. 

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

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

  128. {

  129.     unsigned int crc;

  130.     unsigned char packet[TS_PACKET_SIZE];

  131.     const unsigned char *buf_ptr;

  132.     unsigned char *q;

  133.     int first, b, len1, left;

  134. 

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

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

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

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

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

  140. 

  141.     /* send each packet */

  142.     buf_ptr = buf;

  143.     while (len > 0) {

  144.         first = (buf == buf_ptr);

  145.         q = packet;

  146.         *q++ = 0x47;

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

  148.         if (first)

  149.             b |= 0x40;

  150.         *q++ = b;

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

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

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

  154.         if (first)

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

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

  157.         if (len1 > len)

  158.             len1 = len;

  159.         memcpy(q, buf_ptr, len1);

  160.         q += len1;

  161.         /* add known padding data */

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

  163.         if (left > 0)

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

  165. 

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

  167. 

  168.         buf_ptr += len1;

  169.         len -= len1;

  170.     }

  171. }

  172. 

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

  174. {

  175.     uint8_t *q;

  176.     q = *q_ptr;

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

  178.     *q++ = val;

  179.     *q_ptr = q;

  180. }

  181. 

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

  183.                           int version, int sec_num, int last_sec_num,

  184.                           uint8_t *buf, int len)

  185. {

  186.     uint8_t section[1024], *q;

  187.     unsigned int tot_len;

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

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

  190. 

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

  192.     /* check if not too big */

  193.     if (tot_len > 1024)

  194.         return -1;

  195. 

  196.     q = section;

  197.     *q++ = tid;

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

  199.     put16(&q, id);

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

  201.     *q++ = sec_num;

  202.     *q++ = last_sec_num;

  203.     memcpy(q, buf, len);

  204. 

  205.     mpegts_write_section(s, section, tot_len);

  206.     return 0;

  207. }

  208. 

  209. /*********************************************/

  210. /* mpegts writer */

  211. 

  212. #define DEFAULT_PROVIDER_NAME   "Libav"

  213. #define DEFAULT_SERVICE_NAME    "Service01"

  214. 

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

  216. #define SDT_RETRANS_TIME 500

  217. #define PAT_RETRANS_TIME 100

  218. #define PCR_RETRANS_TIME 20

  219. 

  220. typedef struct MpegTSWriteStream {

  221.     struct MpegTSService *service;

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

  223.     int cc;

  224.     int payload_size;

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

  226.     int64_t payload_pts;

  227.     int64_t payload_dts;

  228.     int payload_flags;

  229.     uint8_t *payload;

  230.     AVFormatContext *amux;

  231. } MpegTSWriteStream;

  232. 

  233. static void mpegts_write_pat(AVFormatContext *s)

  234. {

  235.     MpegTSWrite *ts = s->priv_data;

  236.     MpegTSService *service;

  237.     uint8_t data[1012], *q;

  238.     int i;

  239. 

  240.     q = data;

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

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

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

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

  245.     }

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

  247.                           data, q - data);

  248. }

  249. 

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

  251. {

  252.     MpegTSWrite *ts = s->priv_data;

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

  254.     int val, stream_type, i;

  255. 

  256.     q = data;

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

  258. 

  259.     program_info_length_ptr = q;

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

  261. 

  262.     /* put program info here */

  263. 

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

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

  266.     program_info_length_ptr[1] = val;

  267. 

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

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

  270.         MpegTSWriteStream *ts_st = st->priv_data;

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

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

  273.         case AV_CODEC_ID_MPEG1VIDEO:

  274.         case AV_CODEC_ID_MPEG2VIDEO:

  275.             stream_type = STREAM_TYPE_VIDEO_MPEG2;

  276.             break;

  277.         case AV_CODEC_ID_MPEG4:

  278.             stream_type = STREAM_TYPE_VIDEO_MPEG4;

  279.             break;

  280.         case AV_CODEC_ID_H264:

  281.             stream_type = STREAM_TYPE_VIDEO_H264;

  282.             break;

  283.         case AV_CODEC_ID_CAVS:

  284.             stream_type = STREAM_TYPE_VIDEO_CAVS;

  285.             break;

  286.         case AV_CODEC_ID_DIRAC:

  287.             stream_type = STREAM_TYPE_VIDEO_DIRAC;

  288.             break;

  289.         case AV_CODEC_ID_MP2:

  290.         case AV_CODEC_ID_MP3:

  291.             stream_type = STREAM_TYPE_AUDIO_MPEG1;

  292.             break;

  293.         case AV_CODEC_ID_AAC:

  294.             stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;

  295.             break;

  296.         case AV_CODEC_ID_AAC_LATM:

  297.             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;

  298.             break;

  299.         case AV_CODEC_ID_AC3:

  300.             stream_type = STREAM_TYPE_AUDIO_AC3;

  301.             break;

  302.         default:

  303.             stream_type = STREAM_TYPE_PRIVATE_DATA;

  304.             break;

  305.         }

  306.         *q++ = stream_type;

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

  308.         desc_length_ptr = q;

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

  310. 

  311.         /* write optional descriptors here */

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

  313.         case AVMEDIA_TYPE_AUDIO:

  314.             if (lang) {

  315.                 char *p;

  316.                 char *next = lang->value;

  317.                 uint8_t *len_ptr;

  318. 

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

  320.                 len_ptr = q++;

  321.                 *len_ptr = 0;

  322. 

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

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

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

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

  327. 

  328.                     *q++ = *p++;

  329.                     *q++ = *p++;

  330.                     *q++ = *p++;

  331. 

  332.                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)

  333.                     *q++ = 0x01;

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

  335.                     *q++ = 0x02;

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

  337.                     *q++ = 0x03;

  338.                 else

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

  340. 

  341.                     *len_ptr += 4;

  342.                 }

  343. 

  344.                 if (*len_ptr == 0)

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

  346.             }

  347.             break;

  348.         case AVMEDIA_TYPE_SUBTITLE:

  349.             {

  350.                 const char *language;

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

  352.                 *q++ = 0x59;

  353.                 *q++ = 8;

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

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

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

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

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

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

  360.                     q += 4;

  361.                 } else {

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

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

  364.                 }

  365.             }

  366.             break;

  367.         case AVMEDIA_TYPE_VIDEO:

  368.             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {

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

  370.                 *q++ = 4;

  371.                 *q++ = 'd';

  372.                 *q++ = 'r';

  373.                 *q++ = 'a';

  374.                 *q++ = 'c';

  375.             }

  376.             break;

  377.         }

  378. 

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

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

  381.         desc_length_ptr[1] = val;

  382.     }

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

  384.                           data, q - data);

  385. }

  386. 

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

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

  389. {

  390.     uint8_t *q;

  391.     int len;

  392. 

  393.     q = *q_ptr;

  394.     if (!str)

  395.         len = 0;

  396.     else

  397.         len = strlen(str);

  398.     *q++ = len;

  399.     memcpy(q, str, len);

  400.     q += len;

  401.     *q_ptr = q;

  402. }

  403. 

  404. static void mpegts_write_sdt(AVFormatContext *s)

  405. {

  406.     MpegTSWrite *ts = s->priv_data;

  407.     MpegTSService *service;

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

  409.     int i, running_status, free_ca_mode, val;

  410. 

  411.     q = data;

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

  413.     *q++ = 0xff;

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

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

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

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

  418.         desc_list_len_ptr = q;

  419.         q += 2;

  420.         running_status = 4; /* running */

  421.         free_ca_mode = 0;

  422. 

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

  424.         *q++ = 0x48;

  425.         desc_len_ptr = q;

  426.         q++;

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

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

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

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

  431. 

  432.         /* fill descriptor length */

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

  434.             (q - desc_list_len_ptr - 2);

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

  436.         desc_list_len_ptr[1] = val;

  437.     }

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

  439.                           data, q - data);

  440. }

  441. 

  442. static MpegTSService *mpegts_add_service(MpegTSWrite *ts,

  443.                                          int sid,

  444.                                          const char *provider_name,

  445.                                          const char *name)

  446. {

  447.     MpegTSService *service;

  448. 

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

  450.     if (!service)

  451.         return NULL;

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

  453.     service->sid = sid;

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

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

  456.     service->pcr_pid = 0x1fff;

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

  458.     return service;

  459. }

  460. 

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

  462. {

  463.     AVFormatContext *ctx = s->opaque;

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

  465. }

  466. 

  467. static int mpegts_write_header(AVFormatContext *s)

  468. {

  469.     MpegTSWrite *ts = s->priv_data;

  470.     MpegTSWriteStream *ts_st;

  471.     MpegTSService *service;

  472.     AVStream *st, *pcr_st = NULL;

  473.     AVDictionaryEntry *title, *provider;

  474.     int i, j;

  475.     const char *service_name;

  476.     const char *provider_name;

  477.     int *pids;

  478.     int ret;

  479. 

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

  481.         s->max_delay = 0;

  482. 

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

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

  485. 

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

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

  488.     /* allocate a single DVB service */

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

  490.     if (!title)

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

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

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

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

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

  496.     service->pmt.write_packet = section_write_packet;

  497.     service->pmt.opaque = s;

  498.     service->pmt.cc = 15;

  499. 

  500.     ts->pat.pid = PAT_PID;

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

  502.     ts->pat.write_packet = section_write_packet;

  503.     ts->pat.opaque = s;

  504. 

  505.     ts->sdt.pid = SDT_PID;

  506.     ts->sdt.cc = 15;

  507.     ts->sdt.write_packet = section_write_packet;

  508.     ts->sdt.opaque = s;

  509. 

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

  511.     if (!pids)

  512.         return AVERROR(ENOMEM);

  513. 

  514.     /* assign pids to each stream */

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

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

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

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

  519.         if (!ts_st) {

  520.             ret = AVERROR(ENOMEM);

  521.             goto fail;

  522.         }

  523.         st->priv_data = ts_st;

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

  525.         if (!ts_st->payload) {

  526.             ret = AVERROR(ENOMEM);

  527.             goto fail;

  528.         }

  529.         ts_st->service = service;

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

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

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

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

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

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

  536.         } else {

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

  538.             ret = AVERROR(EINVAL);

  539.             goto fail;

  540.         }

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

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

  543.             ret = AVERROR(EINVAL);

  544.             goto fail;

  545.         }

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

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

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

  549.                 ret = AVERROR(EINVAL);

  550.                 goto fail;

  551.             }

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

  553.         ts_st->payload_pts = AV_NOPTS_VALUE;

  554.         ts_st->payload_dts = AV_NOPTS_VALUE;

  555.         ts_st->first_pts_check = 1;

  556.         ts_st->cc = 15;

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

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

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

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

  561.             pcr_st = st;

  562.         }

  563.         if (st->codec->codec_id == AV_CODEC_ID_AAC &&

  564.             st->codec->extradata_size > 0)

  565.         {

  566.             AVStream *ast;

  567.             ts_st->amux = avformat_alloc_context();

  568.             if (!ts_st->amux) {

  569.                 ret = AVERROR(ENOMEM);

  570.                 goto fail;

  571.             }

  572.             ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);

  573.             if (!ts_st->amux->oformat) {

  574.                 ret = AVERROR(EINVAL);

  575.                 goto fail;

  576.             }

  577.             ast = avformat_new_stream(ts_st->amux, NULL);

  578.             ret = avcodec_copy_context(ast->codec, st->codec);

  579.             if (ret != 0)

  580.                 goto fail;

  581.             ret = avformat_write_header(ts_st->amux, NULL);

  582.             if (ret < 0)

  583.                 goto fail;

  584.         }

  585.     }

  586. 

  587.     av_free(pids);

  588. 

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

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

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

  592.         ts_st = pcr_st->priv_data;

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

  594.     }

  595. 

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

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

  598.             (TS_PACKET_SIZE * 8 * 1000);

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

  600.             (TS_PACKET_SIZE * 8 * 1000);

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

  602.             (TS_PACKET_SIZE * 8 * 1000);

  603. 

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

  605.     } else {

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

  607.         ts->sdt_packet_period = 200;

  608.         ts->pat_packet_period = 40;

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

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

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

  612.                 service->pcr_packet_period =

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

  614.             } else {

  615.                 service->pcr_packet_period =

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

  617.             }

  618.         } else {

  619.             // max delta PCR 0.1s

  620.             service->pcr_packet_period =

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

  622.         }

  623.     }

  624. 

  625.     // output a PCR as soon as possible

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

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

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

  629. 

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

  631.         av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");

  632.     else

  633.         av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);

  634.     av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "

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

  636.            service->pcr_packet_period,

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

  638. 

  639.     avio_flush(s->pb);

  640. 

  641.     return 0;

  642. 

  643.  fail:

  644.     av_free(pids);

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

  646.         MpegTSWriteStream *ts_st;

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

  648.         ts_st = st->priv_data;

  649.         if (ts_st) {

  650.             av_freep(&ts_st->payload);

  651.             if (ts_st->amux) {

  652.                 avformat_free_context(ts_st->amux);

  653.                 ts_st->amux = NULL;

  654.             }

  655.         }

  656.         av_freep(&st->priv_data);

  657.     }

  658.     return ret;

  659. }

  660. 

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

  662. static void retransmit_si_info(AVFormatContext *s)

  663. {

  664.     MpegTSWrite *ts = s->priv_data;

  665.     int i;

  666. 

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

  668.         ts->sdt_packet_count = 0;

  669.         mpegts_write_sdt(s);

  670.     }

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

  672.         ts->pat_packet_count = 0;

  673.         mpegts_write_pat(s);

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

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

  676.         }

  677.     }

  678. }

  679. 

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

  681. {

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

  683.            ts->first_pcr;

  684. }

  685. 

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

  687. {

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

  689. 

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

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

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

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

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

  695.     *buf++ = pcr_low;

  696. 

  697.     return 6;

  698. }

  699. 

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

  701. static void mpegts_insert_null_packet(AVFormatContext *s)

  702. {

  703.     uint8_t *q;

  704.     uint8_t buf[TS_PACKET_SIZE];

  705. 

  706.     q = buf;

  707.     *q++ = 0x47;

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

  709.     *q++ = 0xff;

  710.     *q++ = 0x10;

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

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

  713. }

  714. 

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

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

  717. {

  718.     MpegTSWrite *ts = s->priv_data;

  719.     MpegTSWriteStream *ts_st = st->priv_data;

  720.     uint8_t *q;

  721.     uint8_t buf[TS_PACKET_SIZE];

  722. 

  723.     q = buf;

  724.     *q++ = 0x47;

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

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

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

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

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

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

  731. 

  732.     /* PCR coded into 6 bytes */

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

  734. 

  735.     /* stuffing bytes */

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

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

  738. }

  739. 

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

  741. {

  742.     int val;

  743. 

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

  745.     *q++ = val;

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

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

  748.     *q++ = val;

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

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

  751.     *q++ = val;

  752. }

  753. 

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

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

  756. {

  757.     // expect at least one flag to set

  758.     assert(flag);

  759. 

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

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

  762.         pkt[3] |= 0x20;

  763.         // 1 byte length, no flags

  764.         pkt[4] = 1;

  765.         pkt[5] = 0;

  766.     }

  767.     pkt[5] |= flag;

  768. }

  769. 

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

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

  772. {

  773.     // expect already existing adaptation field

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

  775.     pkt[4] += size;

  776. }

  777. 

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

  779. static uint8_t *get_ts_payload_start(uint8_t *pkt)

  780. {

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

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

  783.     else

  784.         return pkt + 4;

  785. }

  786. 

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

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

  789.  * to exactly fill the last ts packet.

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

  791.  */

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

  793.                              const uint8_t *payload, int payload_size,

  794.                              int64_t pts, int64_t dts, int key)

  795. {

  796.     MpegTSWriteStream *ts_st = st->priv_data;

  797.     MpegTSWrite *ts = s->priv_data;

  798.     uint8_t buf[TS_PACKET_SIZE];

  799.     uint8_t *q;

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

  801.     int afc_len, stuffing_len;

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

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

  804. 

  805.     is_start = 1;

  806.     while (payload_size > 0) {

  807.         retransmit_si_info(s);

  808. 

  809.         write_pcr = 0;

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

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

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

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

  814.                 ts_st->service->pcr_packet_period) {

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

  816.                 write_pcr = 1;

  817.             }

  818.         }

  819. 

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

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

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

  823.             if (write_pcr)

  824.                 mpegts_insert_pcr_only(s, st);

  825.             else

  826.                 mpegts_insert_null_packet(s);

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

  828.         }

  829. 

  830.         /* prepare packet header */

  831.         q = buf;

  832.         *q++ = 0x47;

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

  834.         if (is_start)

  835.             val |= 0x40;

  836.         *q++ = val;

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

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

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

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

  841.             // set Random Access for key frames

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

  843.                 write_pcr = 1;

  844.             set_af_flag(buf, 0x40);

  845.             q = get_ts_payload_start(buf);

  846.         }

  847.         if (write_pcr) {

  848.             set_af_flag(buf, 0x10);

  849.             q = get_ts_payload_start(buf);

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

  851.             if (ts->mux_rate > 1)

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

  853.             else

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

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

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

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

  858.             q = get_ts_payload_start(buf);

  859.         }

  860.         if (is_start) {

  861.             int pes_extension = 0;

  862.             /* write PES header */

  863.             *q++ = 0x00;

  864.             *q++ = 0x00;

  865.             *q++ = 0x01;

  866.             private_code = 0;

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

  868.                 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {

  869.                     *q++ = 0xfd;

  870.                 } else

  871.                     *q++ = 0xe0;

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

  873.                        (st->codec->codec_id == AV_CODEC_ID_MP2 ||

  874.                         st->codec->codec_id == AV_CODEC_ID_MP3 ||

  875.                         st->codec->codec_id == AV_CODEC_ID_AAC)) {

  876.                 *q++ = 0xc0;

  877.             } else {

  878.                 *q++ = 0xbd;

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

  880.                     private_code = 0x20;

  881.                 }

  882.             }

  883.             header_len = 0;

  884.             flags = 0;

  885.             if (pts != AV_NOPTS_VALUE) {

  886.                 header_len += 5;

  887.                 flags |= 0x80;

  888.             }

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

  890.                 header_len += 5;

  891.                 flags |= 0x40;

  892.             }

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

  894.                 st->codec->codec_id == AV_CODEC_ID_DIRAC) {

  895.                 /* set PES_extension_flag */

  896.                 pes_extension = 1;

  897.                 flags |= 0x01;

  898. 

  899.                 /*

  900.                 * One byte for PES2 extension flag +

  901.                 * one byte for extension length +

  902.                 * one byte for extension id

  903.                 */

  904.                 header_len += 3;

  905.             }

  906.             len = payload_size + header_len + 3;

  907.             if (private_code != 0)

  908.                 len++;

  909.             if (len > 0xffff)

  910.                 len = 0;

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

  912.             *q++ = len;

  913.             val = 0x80;

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

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

  916.                 val |= 0x04;

  917.             *q++ = val;

  918.             *q++ = flags;

  919.             *q++ = header_len;

  920.             if (pts != AV_NOPTS_VALUE) {

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

  922.                 q += 5;

  923.             }

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

  925.                 write_pts(q, 1, dts);

  926.                 q += 5;

  927.             }

  928.             if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {

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

  930.                 *q++ = flags;

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

  932.                 /*

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

  934.                 * write the extended stream id

  935.                 */

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

  937.             }

  938.             if (private_code != 0)

  939.                 *q++ = private_code;

  940.             is_start = 0;

  941.         }

  942.         /* header size */

  943.         header_len = q - buf;

  944.         /* data len */

  945.         len = TS_PACKET_SIZE - header_len;

  946.         if (len > payload_size)

  947.             len = payload_size;

  948.         stuffing_len = TS_PACKET_SIZE - header_len - len;

  949.         if (stuffing_len > 0) {

  950.             /* add stuffing with AFC */

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

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

  953.                 afc_len = buf[4] + 1;

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

  955.                         buf + 4 + afc_len,

  956.                         header_len - (4 + afc_len));

  957.                 buf[4] += stuffing_len;

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

  959.             } else {

  960.                 /* add stuffing */

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

  962.                 buf[3] |= 0x20;

  963.                 buf[4] = stuffing_len - 1;

  964.                 if (stuffing_len >= 2) {

  965.                     buf[5] = 0x00;

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

  967.                 }

  968.             }

  969.         }

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

  971.         payload += len;

  972.         payload_size -= len;

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

  974.     }

  975.     avio_flush(s->pb);

  976. }

  977. 

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

  979. {

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

  981.     int size = pkt->size;

  982.     uint8_t *buf= pkt->data;

  983.     uint8_t *data= NULL;

  984.     MpegTSWrite *ts = s->priv_data;

  985.     MpegTSWriteStream *ts_st = st->priv_data;

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

  987.     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

  988. 

  989.     if (ts->reemit_pat_pmt) {

  990.         av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");

  991.         ts->reemit_pat_pmt = 0;

  992.         ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;

  993.     }

  994. 

  995.     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {

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

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

  998.         ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;

  999.     }

  1000. 

  1001.     if (pkt->pts != AV_NOPTS_VALUE)

  1002.         pts = pkt->pts + delay;

  1003.     if (pkt->dts != AV_NOPTS_VALUE)

  1004.         dts = pkt->dts + delay;

  1005. 

  1006.     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {

  1007.         av_log(s, AV_LOG_ERROR, "first pts value must set\n");

  1008.         return AVERROR(EINVAL);

  1009.     }

  1010.     ts_st->first_pts_check = 0;

  1011. 

  1012.     if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1013.         const uint8_t *p = buf, *buf_end = p+size;

  1014.         uint32_t state = -1;

  1015. 

  1016.         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {

  1017.             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "

  1018.                    "no startcode found, use -bsf h264_mp4toannexb\n");

  1019.             return AVERROR(EINVAL);

  1020.         }

  1021. 

  1022.         do {

  1023.             p = avpriv_find_start_code(p, buf_end, &state);

  1024.             av_dlog(s, "nal %d\n", state & 0x1f);

  1025.         } while (p < buf_end && (state & 0x1f) != 9 &&

  1026.                  (state & 0x1f) != 5 && (state & 0x1f) != 1);

  1027. 

  1028.         if ((state & 0x1f) != 9) { // AUD NAL

  1029.             data = av_malloc(pkt->size+6);

  1030.             if (!data)

  1031.                 return AVERROR(ENOMEM);

  1032.             memcpy(data+6, pkt->data, pkt->size);

  1033.             AV_WB32(data, 0x00000001);

  1034.             data[4] = 0x09;

  1035.             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit

  1036.             buf  = data;

  1037.             size = pkt->size+6;

  1038.         }

  1039.     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {

  1040.         if (pkt->size < 2) {

  1041.             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");

  1042.             return AVERROR(EINVAL);

  1043.         }

  1044.         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {

  1045.             int ret;

  1046.             AVPacket pkt2;

  1047. 

  1048.             if (!ts_st->amux) {

  1049.                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "

  1050.                        "and extradata missing\n");

  1051.                 return AVERROR(EINVAL);

  1052.             }

  1053. 

  1054.             av_init_packet(&pkt2);

  1055.             pkt2.data = pkt->data;

  1056.             pkt2.size = pkt->size;

  1057.             ret = avio_open_dyn_buf(&ts_st->amux->pb);

  1058.             if (ret < 0)

  1059.                 return AVERROR(ENOMEM);

  1060. 

  1061.             ret = av_write_frame(ts_st->amux, &pkt2);

  1062.             if (ret < 0) {

  1063.                 avio_close_dyn_buf(ts_st->amux->pb, &data);

  1064.                 ts_st->amux->pb = NULL;

  1065.                 av_free(data);

  1066.                 return ret;

  1067.             }

  1068.             size = avio_close_dyn_buf(ts_st->amux->pb, &data);

  1069.             ts_st->amux->pb = NULL;

  1070.             buf = data;

  1071.         }

  1072.     }

  1073. 

  1074.     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  1075.         // for video and subtitle, write a single pes packet

  1076.         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);

  1077.         av_free(data);

  1078.         return 0;

  1079.     }

  1080. 

  1081.     if (ts_st->payload_size + size > ts->pes_payload_size) {

  1082.         if (ts_st->payload_size) {

  1083.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1084.                              ts_st->payload_pts, ts_st->payload_dts,

  1085.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1086.             ts_st->payload_size = 0;

  1087.         }

  1088.         if (size > ts->pes_payload_size) {

  1089.             mpegts_write_pes(s, st, buf, size, pts, dts,

  1090.                              pkt->flags & AV_PKT_FLAG_KEY);

  1091.             av_free(data);

  1092.             return 0;

  1093.         }

  1094.     }

  1095. 

  1096.     if (!ts_st->payload_size) {

  1097.         ts_st->payload_pts = pts;

  1098.         ts_st->payload_dts = dts;

  1099.         ts_st->payload_flags = pkt->flags;

  1100.     }

  1101. 

  1102.     memcpy(ts_st->payload + ts_st->payload_size, buf, size);

  1103.     ts_st->payload_size += size;

  1104. 

  1105.     av_free(data);

  1106. 

  1107.     return 0;

  1108. }

  1109. 

  1110. static void mpegts_write_flush(AVFormatContext *s)

  1111. {

  1112.     int i;

  1113. 

  1114.     /* flush current packets */

  1115.     for(i = 0; i < s->nb_streams; i++) {

  1116.         AVStream *st = s->streams[i];

  1117.         MpegTSWriteStream *ts_st = st->priv_data;

  1118.         if (ts_st->payload_size > 0) {

  1119.             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,

  1120.                              ts_st->payload_pts, ts_st->payload_dts,

  1121.                              ts_st->payload_flags & AV_PKT_FLAG_KEY);

  1122.             ts_st->payload_size = 0;

  1123.         }

  1124.     }

  1125.     avio_flush(s->pb);

  1126. }

  1127. 

  1128. static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)

  1129. {

  1130.     if (!pkt) {

  1131.         mpegts_write_flush(s);

  1132.         return 1;

  1133.     } else {

  1134.         return mpegts_write_packet_internal(s, pkt);

  1135.     }

  1136. }

  1137. 

  1138. static int mpegts_write_end(AVFormatContext *s)

  1139. {

  1140.     MpegTSWrite *ts = s->priv_data;

  1141.     MpegTSService *service;

  1142.     int i;

  1143. 

  1144.     mpegts_write_flush(s);

  1145. 

  1146.     for(i = 0; i < s->nb_streams; i++) {

  1147.         AVStream *st = s->streams[i];

  1148.         MpegTSWriteStream *ts_st = st->priv_data;

  1149.         av_freep(&ts_st->payload);

  1150.         if (ts_st->amux) {

  1151.             avformat_free_context(ts_st->amux);

  1152.             ts_st->amux = NULL;

  1153.         }

  1154.     }

  1155. 

  1156.     for(i = 0; i < ts->nb_services; i++) {

  1157.         service = ts->services[i];

  1158.         av_freep(&service->provider_name);

  1159.         av_freep(&service->name);

  1160.         av_free(service);

  1161.     }

  1162.     av_free(ts->services);

  1163. 

  1164.     return 0;

  1165. }

  1166. 

  1167. AVOutputFormat ff_mpegts_muxer = {

  1168.     .name              = "mpegts",

  1169.     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),

  1170.     .mime_type         = "video/x-mpegts",

  1171.     .extensions        = "ts,m2t",

  1172.     .priv_data_size    = sizeof(MpegTSWrite),

  1173.     .audio_codec       = AV_CODEC_ID_MP2,

  1174.     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,

  1175.     .write_header      = mpegts_write_header,

  1176.     .write_packet      = mpegts_write_packet,

  1177.     .write_trailer     = mpegts_write_end,

  1178.     .flags             = AVFMT_ALLOW_FLUSH,

  1179.     .priv_class        = &mpegts_muxer_class,

  1180. };