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FFmpeg/libavformat/mpegts.c

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  1. /*

  2.  * MPEG2 transport stream (aka DVB) demuxer

  3.  * Copyright (c) 2002-2003 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. #include "avformat.h"

  22. #include "crc.h"

  23. #include "mpegts.h"

  24. #include "allformats.h"

  25. 

  26. //#define DEBUG_SI

  27. //#define DEBUG_SEEK

  28. 

  29. /* 1.0 second at 24Mbit/s */

  30. #define MAX_SCAN_PACKETS 32000

  31. 

  32. /* maximum size in which we look for synchronisation if

  33.    synchronisation is lost */

  34. #define MAX_RESYNC_SIZE 4096

  35. 

  36. typedef struct PESContext PESContext;

  37. 

  38. static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);

  39. static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);

  40. 

  41. enum MpegTSFilterType {

  42.     MPEGTS_PES,

  43.     MPEGTS_SECTION,

  44. };

  45. 

  46. typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);

  47. 

  48. typedef struct MpegTSPESFilter {

  49.     PESCallback *pes_cb;

  50.     void *opaque;

  51. } MpegTSPESFilter;

  52. 

  53. typedef void SectionCallback(void *opaque, const uint8_t *buf, int len);

  54. 

  55. typedef void SetServiceCallback(void *opaque, int ret);

  56. 

  57. typedef struct MpegTSSectionFilter {

  58.     int section_index;

  59.     int section_h_size;

  60.     uint8_t *section_buf;

  61.     int check_crc:1;

  62.     int end_of_section_reached:1;

  63.     SectionCallback *section_cb;

  64.     void *opaque;

  65. } MpegTSSectionFilter;

  66. 

  67. typedef struct MpegTSFilter {

  68.     int pid;

  69.     int last_cc; /* last cc code (-1 if first packet) */

  70.     enum MpegTSFilterType type;

  71.     union {

  72.         MpegTSPESFilter pes_filter;

  73.         MpegTSSectionFilter section_filter;

  74.     } u;

  75. } MpegTSFilter;

  76. 

  77. typedef struct MpegTSService {

  78.     int running:1;

  79.     int sid;    /**< MPEG Program Number of stream */

  80.     char *provider_name; /**< DVB Network name, "" if not DVB stream */

  81.     char *name; /**< DVB Service name, "MPEG Program [sid]" if not DVB stream*/

  82. } MpegTSService;

  83. 

  84. struct MpegTSContext {

  85.     /* user data */

  86.     AVFormatContext *stream;

  87.     /** raw packet size, including FEC if present            */

  88.     int raw_packet_size;

  89.     /** if true, all pids are analyzed to find streams       */

  90.     int auto_guess;

  91. 

  92.     /** compute exact PCR for each transport stream packet   */

  93.     int mpeg2ts_compute_pcr;

  94. 

  95.     int64_t cur_pcr;    /**< used to estimate the exact PCR  */

  96.     int pcr_incr;       /**< used to estimate the exact PCR  */

  97.     int pcr_pid;        /**< used to estimate the exact PCR  */

  98. 

  99.     /* data needed to handle file based ts */

  100.     /** stop parsing loop                                    */

  101.     int stop_parse;

  102.     /** packet containing Audio/Video data                   */

  103.     AVPacket *pkt;

  104. 

  105.     /******************************************/

  106.     /* private mpegts data */

  107.     /* scan context */

  108.     MpegTSFilter *sdt_filter;

  109.     /** number of PMTs in the last PAT seen                  */

  110.     int nb_services;

  111.     /** list of PMTs in the last PAT seen                    */

  112.     MpegTSService **services;

  113. 

  114.     /* set service context (XXX: allocated it ?) */

  115.     SetServiceCallback *set_service_cb;

  116.     void *set_service_opaque;

  117.     /** filter for the PAT                                   */

  118.     MpegTSFilter *pat_filter;

  119.     /** filter for the PMT for the MPEG program number specified by req_sid */

  120.     MpegTSFilter *pmt_filter;

  121.     /** MPEG program number of stream we want to decode      */

  122.     int req_sid;

  123. 

  124.     /** filters for various streams specified by PMT + for the PAT and PMT */

  125.     MpegTSFilter *pids[NB_PID_MAX];

  126. };

  127. 

  128. /**

  129.  *  Assembles PES packets out of TS packets, and then calls the "section_cb"

  130.  *  function when they are complete.

  131.  */

  132. static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,

  133.                                const uint8_t *buf, int buf_size, int is_start)

  134. {

  135.     MpegTSSectionFilter *tss = &tss1->u.section_filter;

  136.     int len;

  137. 

  138.     if (is_start) {

  139.         memcpy(tss->section_buf, buf, buf_size);

  140.         tss->section_index = buf_size;

  141.         tss->section_h_size = -1;

  142.         tss->end_of_section_reached = 0;

  143.     } else {

  144.         if (tss->end_of_section_reached)

  145.             return;

  146.         len = 4096 - tss->section_index;

  147.         if (buf_size < len)

  148.             len = buf_size;

  149.         memcpy(tss->section_buf + tss->section_index, buf, len);

  150.         tss->section_index += len;

  151.     }

  152. 

  153.     /* compute section length if possible */

  154.     if (tss->section_h_size == -1 && tss->section_index >= 3) {

  155.         len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3;

  156.         if (len > 4096)

  157.             return;

  158.         tss->section_h_size = len;

  159.     }

  160. 

  161.     if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {

  162.         tss->end_of_section_reached = 1;

  163.         if (!tss->check_crc ||

  164.             av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0)

  165.             tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size);

  166.     }

  167. }

  168. 

  169. static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,

  170.                                          SectionCallback *section_cb, void *opaque,

  171.                                          int check_crc)

  172. 

  173. {

  174.     MpegTSFilter *filter;

  175.     MpegTSSectionFilter *sec;

  176. 

  177. #ifdef DEBUG_SI

  178.     av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);

  179. #endif

  180.     if (pid >= NB_PID_MAX || ts->pids[pid])

  181.         return NULL;

  182.     filter = av_mallocz(sizeof(MpegTSFilter));

  183.     if (!filter)

  184.         return NULL;

  185.     ts->pids[pid] = filter;

  186.     filter->type = MPEGTS_SECTION;

  187.     filter->pid = pid;

  188.     filter->last_cc = -1;

  189.     sec = &filter->u.section_filter;

  190.     sec->section_cb = section_cb;

  191.     sec->opaque = opaque;

  192.     sec->section_buf = av_malloc(MAX_SECTION_SIZE);

  193.     sec->check_crc = check_crc;

  194.     if (!sec->section_buf) {

  195.         av_free(filter);

  196.         return NULL;

  197.     }

  198.     return filter;

  199. }

  200. 

  201. static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,

  202.                                      PESCallback *pes_cb,

  203.                                      void *opaque)

  204. {

  205.     MpegTSFilter *filter;

  206.     MpegTSPESFilter *pes;

  207. 

  208.     if (pid >= NB_PID_MAX || ts->pids[pid])

  209.         return NULL;

  210.     filter = av_mallocz(sizeof(MpegTSFilter));

  211.     if (!filter)

  212.         return NULL;

  213.     ts->pids[pid] = filter;

  214.     filter->type = MPEGTS_PES;

  215.     filter->pid = pid;

  216.     filter->last_cc = -1;

  217.     pes = &filter->u.pes_filter;

  218.     pes->pes_cb = pes_cb;

  219.     pes->opaque = opaque;

  220.     return filter;

  221. }

  222. 

  223. static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)

  224. {

  225.     int pid;

  226. 

  227.     pid = filter->pid;

  228.     if (filter->type == MPEGTS_SECTION)

  229.         av_freep(&filter->u.section_filter.section_buf);

  230.     else if (filter->type == MPEGTS_PES)

  231.         av_freep(&filter->u.pes_filter.opaque);

  232. 

  233.     av_free(filter);

  234.     ts->pids[pid] = NULL;

  235. }

  236. 

  237. static int analyze(const uint8_t *buf, int size, int packet_size, int *index){

  238.     int stat[packet_size];

  239.     int i;

  240.     int x=0;

  241.     int best_score=0;

  242. 

  243.     memset(stat, 0, packet_size*sizeof(int));

  244. 

  245.     for(x=i=0; i<size; i++){

  246.         if(buf[i] == 0x47){

  247.             stat[x]++;

  248.             if(stat[x] > best_score){

  249.                 best_score= stat[x];

  250.                 if(index) *index= x;

  251.             }

  252.         }

  253. 

  254.         x++;

  255.         if(x == packet_size) x= 0;

  256.     }

  257. 

  258.     return best_score;

  259. }

  260. 

  261. /* autodetect fec presence. Must have at least 1024 bytes  */

  262. static int get_packet_size(const uint8_t *buf, int size)

  263. {

  264.     int score, fec_score, dvhs_score;

  265. 

  266.     if (size < (TS_FEC_PACKET_SIZE * 5 + 1))

  267.         return -1;

  268. 

  269.     score    = analyze(buf, size, TS_PACKET_SIZE, NULL);

  270.     dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);

  271.     fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);

  272. //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);

  273. 

  274.     if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;

  275.     else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;

  276.     else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;

  277.     else                       return -1;

  278. }

  279. 

  280. typedef struct SectionHeader {

  281.     uint8_t tid;

  282.     uint16_t id;

  283.     uint8_t version;

  284.     uint8_t sec_num;

  285.     uint8_t last_sec_num;

  286. } SectionHeader;

  287. 

  288. static inline int get8(const uint8_t **pp, const uint8_t *p_end)

  289. {

  290.     const uint8_t *p;

  291.     int c;

  292. 

  293.     p = *pp;

  294.     if (p >= p_end)

  295.         return -1;

  296.     c = *p++;

  297.     *pp = p;

  298.     return c;

  299. }

  300. 

  301. static inline int get16(const uint8_t **pp, const uint8_t *p_end)

  302. {

  303.     const uint8_t *p;

  304.     int c;

  305. 

  306.     p = *pp;

  307.     if ((p + 1) >= p_end)

  308.         return -1;

  309.     c = (p[0] << 8) | p[1];

  310.     p += 2;

  311.     *pp = p;

  312.     return c;

  313. }

  314. 

  315. /* read and allocate a DVB string preceeded by its length */

  316. static char *getstr8(const uint8_t **pp, const uint8_t *p_end)

  317. {

  318.     int len;

  319.     const uint8_t *p;

  320.     char *str;

  321. 

  322.     p = *pp;

  323.     len = get8(&p, p_end);

  324.     if (len < 0)

  325.         return NULL;

  326.     if ((p + len) > p_end)

  327.         return NULL;

  328.     str = av_malloc(len + 1);

  329.     if (!str)

  330.         return NULL;

  331.     memcpy(str, p, len);

  332.     str[len] = '\0';

  333.     p += len;

  334.     *pp = p;

  335.     return str;

  336. }

  337. 

  338. static int parse_section_header(SectionHeader *h,

  339.                                 const uint8_t **pp, const uint8_t *p_end)

  340. {

  341.     int val;

  342. 

  343.     val = get8(pp, p_end);

  344.     if (val < 0)

  345.         return -1;

  346.     h->tid = val;

  347.     *pp += 2;

  348.     val = get16(pp, p_end);

  349.     if (val < 0)

  350.         return -1;

  351.     h->id = val;

  352.     val = get8(pp, p_end);

  353.     if (val < 0)

  354.         return -1;

  355.     h->version = (val >> 1) & 0x1f;

  356.     val = get8(pp, p_end);

  357.     if (val < 0)

  358.         return -1;

  359.     h->sec_num = val;

  360.     val = get8(pp, p_end);

  361.     if (val < 0)

  362.         return -1;

  363.     h->last_sec_num = val;

  364.     return 0;

  365. }

  366. 

  367. static MpegTSService *new_service(MpegTSContext *ts, int sid,

  368.                                   char *provider_name, char *name)

  369. {

  370.     MpegTSService *service;

  371. 

  372. #ifdef DEBUG_SI

  373.     av_log(ts->stream, AV_LOG_DEBUG, "new_service: "

  374.            "sid=0x%04x provider='%s' name='%s'\n",

  375.            sid, provider_name, name);

  376. #endif

  377. 

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

  379.     if (!service)

  380.         return NULL;

  381.     service->sid = sid;

  382.     service->provider_name = provider_name;

  383.     service->name = name;

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

  385.     return service;

  386. }

  387. 

  388. static void pmt_cb(void *opaque, const uint8_t *section, int section_len)

  389. {

  390.     MpegTSContext *ts = opaque;

  391.     SectionHeader h1, *h = &h1;

  392.     PESContext *pes;

  393.     AVStream *st;

  394.     const uint8_t *p, *p_end, *desc_list_end, *desc_end;

  395.     int program_info_length, pcr_pid, pid, stream_type;

  396.     int desc_list_len, desc_len, desc_tag;

  397.     int comp_page = 0, anc_page = 0; /* initialize to kill warnings */

  398.     char language[4] = {0}; /* initialize to kill warnings */

  399. 

  400. #ifdef DEBUG_SI

  401.     av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);

  402.     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

  403. #endif

  404.     p_end = section + section_len - 4;

  405.     p = section;

  406.     if (parse_section_header(h, &p, p_end) < 0)

  407.         return;

  408. #ifdef DEBUG_SI

  409.     av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",

  410.            h->id, h->sec_num, h->last_sec_num);

  411. #endif

  412.     if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) )

  413.         return;

  414. 

  415.     pcr_pid = get16(&p, p_end) & 0x1fff;

  416.     if (pcr_pid < 0)

  417.         return;

  418.     ts->pcr_pid = pcr_pid;

  419. #ifdef DEBUG_SI

  420.     av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);

  421. #endif

  422.     program_info_length = get16(&p, p_end) & 0xfff;

  423.     if (program_info_length < 0)

  424.         return;

  425.     p += program_info_length;

  426.     if (p >= p_end)

  427.         return;

  428.     for(;;) {

  429.         language[0] = 0;

  430.         st = 0;

  431.         stream_type = get8(&p, p_end);

  432.         if (stream_type < 0)

  433.             break;

  434.         pid = get16(&p, p_end) & 0x1fff;

  435.         if (pid < 0)

  436.             break;

  437.         desc_list_len = get16(&p, p_end) & 0xfff;

  438.         if (desc_list_len < 0)

  439.             break;

  440.         desc_list_end = p + desc_list_len;

  441.         if (desc_list_end > p_end)

  442.             break;

  443.         for(;;) {

  444.             desc_tag = get8(&p, desc_list_end);

  445.             if (desc_tag < 0)

  446.                 break;

  447.             if (stream_type == STREAM_TYPE_PRIVATE_DATA) {

  448.                 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {

  449.                     /*assume DVB AC-3 Audio*/

  450.                     stream_type = STREAM_TYPE_AUDIO_AC3;

  451.                 } else if(desc_tag == 0x7B) {

  452.                     /* DVB DTS audio */

  453.                     stream_type = STREAM_TYPE_AUDIO_DTS;

  454.                 }

  455.             }

  456.             desc_len = get8(&p, desc_list_end);

  457.             desc_end = p + desc_len;

  458.             if (desc_end > desc_list_end)

  459.                 break;

  460. #ifdef DEBUG_SI

  461.             av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",

  462.                    desc_tag, desc_len);

  463. #endif

  464.             switch(desc_tag) {

  465.             case DVB_SUBT_DESCID:

  466.                 if (stream_type == STREAM_TYPE_PRIVATE_DATA)

  467.                     stream_type = STREAM_TYPE_SUBTITLE_DVB;

  468. 

  469.                 language[0] = get8(&p, desc_end);

  470.                 language[1] = get8(&p, desc_end);

  471.                 language[2] = get8(&p, desc_end);

  472.                 language[3] = 0;

  473.                 get8(&p, desc_end);

  474.                 comp_page = get16(&p, desc_end);

  475.                 anc_page = get16(&p, desc_end);

  476. 

  477.                 break;

  478.             case 0x0a: /* ISO 639 language descriptor */

  479.                 language[0] = get8(&p, desc_end);

  480.                 language[1] = get8(&p, desc_end);

  481.                 language[2] = get8(&p, desc_end);

  482.                 language[3] = 0;

  483.                 break;

  484.             default:

  485.                 break;

  486.             }

  487.             p = desc_end;

  488.         }

  489.         p = desc_list_end;

  490. 

  491. #ifdef DEBUG_SI

  492.         av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",

  493.                stream_type, pid);

  494. #endif

  495. 

  496.         /* now create ffmpeg stream */

  497.         switch(stream_type) {

  498.         case STREAM_TYPE_AUDIO_MPEG1:

  499.         case STREAM_TYPE_AUDIO_MPEG2:

  500.         case STREAM_TYPE_VIDEO_MPEG1:

  501.         case STREAM_TYPE_VIDEO_MPEG2:

  502.         case STREAM_TYPE_VIDEO_MPEG4:

  503.         case STREAM_TYPE_VIDEO_H264:

  504.         case STREAM_TYPE_VIDEO_VC1:

  505.         case STREAM_TYPE_AUDIO_AAC:

  506.         case STREAM_TYPE_AUDIO_AC3:

  507.         case STREAM_TYPE_AUDIO_DTS:

  508.         case STREAM_TYPE_SUBTITLE_DVB:

  509.             pes = add_pes_stream(ts, pid, stream_type);

  510.             if (pes)

  511.                 st = new_pes_av_stream(pes, 0);

  512.             break;

  513.         default:

  514.             /* we ignore the other streams */

  515.             break;

  516.         }

  517. 

  518.         if (st) {

  519.             if (language[0] != 0) {

  520.                 st->language[0] = language[0];

  521.                 st->language[1] = language[1];

  522.                 st->language[2] = language[2];

  523.                 st->language[3] = language[3];

  524.             }

  525. 

  526.             if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {

  527.                 st->codec->sub_id = (anc_page << 16) | comp_page;

  528.             }

  529.         }

  530.     }

  531.     /* all parameters are there */

  532.     ts->set_service_cb(ts->set_service_opaque, 0);

  533.     mpegts_close_filter(ts, ts->pmt_filter);

  534.     ts->pmt_filter = NULL;

  535. }

  536. 

  537. static void pat_cb(void *opaque, const uint8_t *section, int section_len)

  538. {

  539.     MpegTSContext *ts = opaque;

  540.     SectionHeader h1, *h = &h1;

  541.     const uint8_t *p, *p_end;

  542.     int sid, pmt_pid;

  543. 

  544. #ifdef DEBUG_SI

  545.     av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");

  546.     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

  547. #endif

  548.     p_end = section + section_len - 4;

  549.     p = section;

  550.     if (parse_section_header(h, &p, p_end) < 0)

  551.         return;

  552.     if (h->tid != PAT_TID)

  553.         return;

  554. 

  555.     for(;;) {

  556.         sid = get16(&p, p_end);

  557.         if (sid < 0)

  558.             break;

  559.         pmt_pid = get16(&p, p_end) & 0x1fff;

  560.         if (pmt_pid < 0)

  561.             break;

  562. #ifdef DEBUG_SI

  563.         av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);

  564. #endif

  565.         if (sid == 0x0000) {

  566.             /* NIT info */

  567.         } else {

  568.             if (ts->req_sid == sid) {

  569.                 ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,

  570.                                                             pmt_cb, ts, 1);

  571.                 goto found;

  572.             }

  573.         }

  574.     }

  575.     /* not found */

  576.     ts->set_service_cb(ts->set_service_opaque, -1);

  577. 

  578.  found:

  579.     mpegts_close_filter(ts, ts->pat_filter);

  580.     ts->pat_filter = NULL;

  581. }

  582. 

  583. /* add all services found in the PAT */

  584. static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len)

  585. {

  586.     MpegTSContext *ts = opaque;

  587.     SectionHeader h1, *h = &h1;

  588.     const uint8_t *p, *p_end;

  589.     int sid, pmt_pid;

  590.     char *provider_name, *name;

  591.     char buf[256];

  592. 

  593. #ifdef DEBUG_SI

  594.     av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");

  595.     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

  596. #endif

  597.     p_end = section + section_len - 4;

  598.     p = section;

  599.     if (parse_section_header(h, &p, p_end) < 0)

  600.         return;

  601.     if (h->tid != PAT_TID)

  602.         return;

  603. 

  604.     for(;;) {

  605.         sid = get16(&p, p_end);

  606.         if (sid < 0)

  607.             break;

  608.         pmt_pid = get16(&p, p_end) & 0x1fff;

  609.         if (pmt_pid < 0)

  610.             break;

  611. #ifdef DEBUG_SI

  612.         av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);

  613. #endif

  614.         if (sid == 0x0000) {

  615.             /* NIT info */

  616.         } else {

  617.             /* add the service with a dummy name */

  618.             snprintf(buf, sizeof(buf), "Service %x\n", sid);

  619.             name = av_strdup(buf);

  620.             provider_name = av_strdup("");

  621.             if (name && provider_name) {

  622.                 new_service(ts, sid, provider_name, name);

  623.             } else {

  624.                 av_freep(&name);

  625.                 av_freep(&provider_name);

  626.             }

  627.         }

  628.     }

  629.     ts->stop_parse = 1;

  630. 

  631.     /* remove filter */

  632.     mpegts_close_filter(ts, ts->pat_filter);

  633.     ts->pat_filter = NULL;

  634. }

  635. 

  636. static void mpegts_set_service(MpegTSContext *ts, int sid,

  637.                         SetServiceCallback *set_service_cb, void *opaque)

  638. {

  639.     ts->set_service_cb = set_service_cb;

  640.     ts->set_service_opaque = opaque;

  641.     ts->req_sid = sid;

  642.     ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,

  643.                                                 pat_cb, ts, 1);

  644. }

  645. 

  646. static void sdt_cb(void *opaque, const uint8_t *section, int section_len)

  647. {

  648.     MpegTSContext *ts = opaque;

  649.     SectionHeader h1, *h = &h1;

  650.     const uint8_t *p, *p_end, *desc_list_end, *desc_end;

  651.     int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;

  652.     char *name, *provider_name;

  653. 

  654. #ifdef DEBUG_SI

  655.     av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");

  656.     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

  657. #endif

  658. 

  659.     p_end = section + section_len - 4;

  660.     p = section;

  661.     if (parse_section_header(h, &p, p_end) < 0)

  662.         return;

  663.     if (h->tid != SDT_TID)

  664.         return;

  665.     onid = get16(&p, p_end);

  666.     if (onid < 0)

  667.         return;

  668.     val = get8(&p, p_end);

  669.     if (val < 0)

  670.         return;

  671.     for(;;) {

  672.         sid = get16(&p, p_end);

  673.         if (sid < 0)

  674.             break;

  675.         val = get8(&p, p_end);

  676.         if (val < 0)

  677.             break;

  678.         desc_list_len = get16(&p, p_end) & 0xfff;

  679.         if (desc_list_len < 0)

  680.             break;

  681.         desc_list_end = p + desc_list_len;

  682.         if (desc_list_end > p_end)

  683.             break;

  684.         for(;;) {

  685.             desc_tag = get8(&p, desc_list_end);

  686.             if (desc_tag < 0)

  687.                 break;

  688.             desc_len = get8(&p, desc_list_end);

  689.             desc_end = p + desc_len;

  690.             if (desc_end > desc_list_end)

  691.                 break;

  692. #ifdef DEBUG_SI

  693.             av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",

  694.                    desc_tag, desc_len);

  695. #endif

  696.             switch(desc_tag) {

  697.             case 0x48:

  698.                 service_type = get8(&p, p_end);

  699.                 if (service_type < 0)

  700.                     break;

  701.                 provider_name = getstr8(&p, p_end);

  702.                 if (!provider_name)

  703.                     break;

  704.                 name = getstr8(&p, p_end);

  705.                 if (!name)

  706.                     break;

  707.                 new_service(ts, sid, provider_name, name);

  708.                 break;

  709.             default:

  710.                 break;

  711.             }

  712.             p = desc_end;

  713.         }

  714.         p = desc_list_end;

  715.     }

  716.     ts->stop_parse = 1;

  717. 

  718.     /* remove filter */

  719.     mpegts_close_filter(ts, ts->sdt_filter);

  720.     ts->sdt_filter = NULL;

  721. }

  722. 

  723. /* scan services in a transport stream by looking at the SDT */

  724. static void mpegts_scan_sdt(MpegTSContext *ts)

  725. {

  726.     ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID,

  727.                                                 sdt_cb, ts, 1);

  728. }

  729. 

  730. /* scan services in a transport stream by looking at the PAT (better

  731.    than nothing !) */

  732. static void mpegts_scan_pat(MpegTSContext *ts)

  733. {

  734.     ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,

  735.                                                 pat_scan_cb, ts, 1);

  736. }

  737. 

  738. /* TS stream handling */

  739. 

  740. enum MpegTSState {

  741.     MPEGTS_HEADER = 0,

  742.     MPEGTS_PESHEADER_FILL,

  743.     MPEGTS_PAYLOAD,

  744.     MPEGTS_SKIP,

  745. };

  746. 

  747. /* enough for PES header + length */

  748. #define PES_START_SIZE 9

  749. #define MAX_PES_HEADER_SIZE (9 + 255)

  750. 

  751. struct PESContext {

  752.     int pid;

  753.     int stream_type;

  754.     MpegTSContext *ts;

  755.     AVFormatContext *stream;

  756.     AVStream *st;

  757.     enum MpegTSState state;

  758.     /* used to get the format */

  759.     int data_index;

  760.     int total_size;

  761.     int pes_header_size;

  762.     int64_t pts, dts;

  763.     uint8_t header[MAX_PES_HEADER_SIZE];

  764. };

  765. 

  766. static int64_t get_pts(const uint8_t *p)

  767. {

  768.     int64_t pts;

  769.     int val;

  770. 

  771.     pts = (int64_t)((p[0] >> 1) & 0x07) << 30;

  772.     val = (p[1] << 8) | p[2];

  773.     pts |= (int64_t)(val >> 1) << 15;

  774.     val = (p[3] << 8) | p[4];

  775.     pts |= (int64_t)(val >> 1);

  776.     return pts;

  777. }

  778. 

  779. /* return non zero if a packet could be constructed */

  780. static void mpegts_push_data(void *opaque,

  781.                              const uint8_t *buf, int buf_size, int is_start)

  782. {

  783.     PESContext *pes = opaque;

  784.     MpegTSContext *ts = pes->ts;

  785.     const uint8_t *p;

  786.     int len, code;

  787. 

  788.     if(!ts->pkt)

  789.         return;

  790. 

  791.     if (is_start) {

  792.         pes->state = MPEGTS_HEADER;

  793.         pes->data_index = 0;

  794.     }

  795.     p = buf;

  796.     while (buf_size > 0) {

  797.         switch(pes->state) {

  798.         case MPEGTS_HEADER:

  799.             len = PES_START_SIZE - pes->data_index;

  800.             if (len > buf_size)

  801.                 len = buf_size;

  802.             memcpy(pes->header + pes->data_index, p, len);

  803.             pes->data_index += len;

  804.             p += len;

  805.             buf_size -= len;

  806.             if (pes->data_index == PES_START_SIZE) {

  807.                 /* we got all the PES or section header. We can now

  808.                    decide */

  809. #if 0

  810.                 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);

  811. #endif

  812.                 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&

  813.                     pes->header[2] == 0x01) {

  814.                     /* it must be an mpeg2 PES stream */

  815.                     code = pes->header[3] | 0x100;

  816.                     if (!((code >= 0x1c0 && code <= 0x1df) ||

  817.                           (code >= 0x1e0 && code <= 0x1ef) ||

  818.                           (code == 0x1bd) || (code == 0x1fd)))

  819.                         goto skip;

  820.                     if (!pes->st) {

  821.                         /* allocate stream */

  822.                         new_pes_av_stream(pes, code);

  823.                     }

  824.                     pes->state = MPEGTS_PESHEADER_FILL;

  825.                     pes->total_size = (pes->header[4] << 8) | pes->header[5];

  826.                     /* NOTE: a zero total size means the PES size is

  827.                        unbounded */

  828.                     if (pes->total_size)

  829.                         pes->total_size += 6;

  830.                     pes->pes_header_size = pes->header[8] + 9;

  831.                 } else {

  832.                     /* otherwise, it should be a table */

  833.                     /* skip packet */

  834.                 skip:

  835.                     pes->state = MPEGTS_SKIP;

  836.                     continue;

  837.                 }

  838.             }

  839.             break;

  840.             /**********************************************/

  841.             /* PES packing parsing */

  842.         case MPEGTS_PESHEADER_FILL:

  843.             len = pes->pes_header_size - pes->data_index;

  844.             if (len > buf_size)

  845.                 len = buf_size;

  846.             memcpy(pes->header + pes->data_index, p, len);

  847.             pes->data_index += len;

  848.             p += len;

  849.             buf_size -= len;

  850.             if (pes->data_index == pes->pes_header_size) {

  851.                 const uint8_t *r;

  852.                 unsigned int flags;

  853. 

  854.                 flags = pes->header[7];

  855.                 r = pes->header + 9;

  856.                 pes->pts = AV_NOPTS_VALUE;

  857.                 pes->dts = AV_NOPTS_VALUE;

  858.                 if ((flags & 0xc0) == 0x80) {

  859.                     pes->pts = get_pts(r);

  860.                     r += 5;

  861.                 } else if ((flags & 0xc0) == 0xc0) {

  862.                     pes->pts = get_pts(r);

  863.                     r += 5;

  864.                     pes->dts = get_pts(r);

  865.                     r += 5;

  866.                 }

  867.                 /* we got the full header. We parse it and get the payload */

  868.                 pes->state = MPEGTS_PAYLOAD;

  869.             }

  870.             break;

  871.         case MPEGTS_PAYLOAD:

  872.             if (pes->total_size) {

  873.                 len = pes->total_size - pes->data_index;

  874.                 if (len > buf_size)

  875.                     len = buf_size;

  876.             } else {

  877.                 len = buf_size;

  878.             }

  879.             if (len > 0) {

  880.                 AVPacket *pkt = ts->pkt;

  881.                 if (pes->st && av_new_packet(pkt, len) == 0) {

  882.                     memcpy(pkt->data, p, len);

  883.                     pkt->stream_index = pes->st->index;

  884.                     pkt->pts = pes->pts;

  885.                     pkt->dts = pes->dts;

  886.                     /* reset pts values */

  887.                     pes->pts = AV_NOPTS_VALUE;

  888.                     pes->dts = AV_NOPTS_VALUE;

  889.                     ts->stop_parse = 1;

  890.                     return;

  891.                 }

  892.             }

  893.             buf_size = 0;

  894.             break;

  895.         case MPEGTS_SKIP:

  896.             buf_size = 0;

  897.             break;

  898.         }

  899.     }

  900. }

  901. 

  902. static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)

  903. {

  904.     AVStream *st;

  905.     int codec_type, codec_id;

  906. 

  907.     switch(pes->stream_type){

  908.     case STREAM_TYPE_AUDIO_MPEG1:

  909.     case STREAM_TYPE_AUDIO_MPEG2:

  910.         codec_type = CODEC_TYPE_AUDIO;

  911.         codec_id = CODEC_ID_MP3;

  912.         break;

  913.     case STREAM_TYPE_VIDEO_MPEG1:

  914.     case STREAM_TYPE_VIDEO_MPEG2:

  915.         codec_type = CODEC_TYPE_VIDEO;

  916.         codec_id = CODEC_ID_MPEG2VIDEO;

  917.         break;

  918.     case STREAM_TYPE_VIDEO_MPEG4:

  919.         codec_type = CODEC_TYPE_VIDEO;

  920.         codec_id = CODEC_ID_MPEG4;

  921.         break;

  922.     case STREAM_TYPE_VIDEO_H264:

  923.         codec_type = CODEC_TYPE_VIDEO;

  924.         codec_id = CODEC_ID_H264;

  925.         break;

  926.     case STREAM_TYPE_VIDEO_VC1:

  927.         codec_type = CODEC_TYPE_VIDEO;

  928.         codec_id = CODEC_ID_VC1;

  929.         break;

  930.     case STREAM_TYPE_AUDIO_AAC:

  931.         codec_type = CODEC_TYPE_AUDIO;

  932.         codec_id = CODEC_ID_AAC;

  933.         break;

  934.     case STREAM_TYPE_AUDIO_AC3:

  935.         codec_type = CODEC_TYPE_AUDIO;

  936.         codec_id = CODEC_ID_AC3;

  937.         break;

  938.     case STREAM_TYPE_AUDIO_DTS:

  939.         codec_type = CODEC_TYPE_AUDIO;

  940.         codec_id = CODEC_ID_DTS;

  941.         break;

  942.     case STREAM_TYPE_SUBTITLE_DVB:

  943.         codec_type = CODEC_TYPE_SUBTITLE;

  944.         codec_id = CODEC_ID_DVB_SUBTITLE;

  945.         break;

  946.     default:

  947.         if (code >= 0x1c0 && code <= 0x1df) {

  948.             codec_type = CODEC_TYPE_AUDIO;

  949.             codec_id = CODEC_ID_MP2;

  950.         } else if (code == 0x1bd) {

  951.             codec_type = CODEC_TYPE_AUDIO;

  952.             codec_id = CODEC_ID_AC3;

  953.         } else {

  954.             codec_type = CODEC_TYPE_VIDEO;

  955.             codec_id = CODEC_ID_MPEG1VIDEO;

  956.         }

  957.         break;

  958.     }

  959.     st = av_new_stream(pes->stream, pes->pid);

  960.     if (st) {

  961.         av_set_pts_info(st, 33, 1, 90000);

  962.         st->priv_data = pes;

  963.         st->codec->codec_type = codec_type;

  964.         st->codec->codec_id = codec_id;

  965.         st->need_parsing = AVSTREAM_PARSE_FULL;

  966.         pes->st = st;

  967.     }

  968.     return st;

  969. }

  970. 

  971. 

  972. static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)

  973. {

  974.     MpegTSFilter *tss;

  975.     PESContext *pes;

  976. 

  977.     /* if no pid found, then add a pid context */

  978.     pes = av_mallocz(sizeof(PESContext));

  979.     if (!pes)

  980.         return 0;

  981.     pes->ts = ts;

  982.     pes->stream = ts->stream;

  983.     pes->pid = pid;

  984.     pes->stream_type = stream_type;

  985.     tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);

  986.     if (!tss) {

  987.         av_free(pes);

  988.         return 0;

  989.     }

  990.     return pes;

  991. }

  992. 

  993. /* handle one TS packet */

  994. static void handle_packet(MpegTSContext *ts, const uint8_t *packet)

  995. {

  996.     AVFormatContext *s = ts->stream;

  997.     MpegTSFilter *tss;

  998.     int len, pid, cc, cc_ok, afc, is_start;

  999.     const uint8_t *p, *p_end;

  1000. 

  1001.     pid = ((packet[1] & 0x1f) << 8) | packet[2];

  1002.     is_start = packet[1] & 0x40;

  1003.     tss = ts->pids[pid];

  1004.     if (ts->auto_guess && tss == NULL && is_start) {

  1005.         add_pes_stream(ts, pid, 0);

  1006.         tss = ts->pids[pid];

  1007.     }

  1008.     if (!tss)

  1009.         return;

  1010. 

  1011.     /* continuity check (currently not used) */

  1012.     cc = (packet[3] & 0xf);

  1013.     cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));

  1014.     tss->last_cc = cc;

  1015. 

  1016.     /* skip adaptation field */

  1017.     afc = (packet[3] >> 4) & 3;

  1018.     p = packet + 4;

  1019.     if (afc == 0) /* reserved value */

  1020.         return;

  1021.     if (afc == 2) /* adaptation field only */

  1022.         return;

  1023.     if (afc == 3) {

  1024.         /* skip adapation field */

  1025.         p += p[0] + 1;

  1026.     }

  1027.     /* if past the end of packet, ignore */

  1028.     p_end = packet + TS_PACKET_SIZE;

  1029.     if (p >= p_end)

  1030.         return;

  1031. 

  1032.     if (tss->type == MPEGTS_SECTION) {

  1033.         if (is_start) {

  1034.             /* pointer field present */

  1035.             len = *p++;

  1036.             if (p + len > p_end)

  1037.                 return;

  1038.             if (len && cc_ok) {

  1039.                 /* write remaining section bytes */

  1040.                 write_section_data(s, tss,

  1041.                                    p, len, 0);

  1042.                 /* check whether filter has been closed */

  1043.                 if (!ts->pids[pid])

  1044.                     return;

  1045.             }

  1046.             p += len;

  1047.             if (p < p_end) {

  1048.                 write_section_data(s, tss,

  1049.                                    p, p_end - p, 1);

  1050.             }

  1051.         } else {

  1052.             if (cc_ok) {

  1053.                 write_section_data(s, tss,

  1054.                                    p, p_end - p, 0);

  1055.             }

  1056.         }

  1057.     } else {

  1058.         tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,

  1059.                                  p, p_end - p, is_start);

  1060.     }

  1061. }

  1062. 

  1063. /* XXX: try to find a better synchro over several packets (use

  1064.    get_packet_size() ?) */

  1065. static int mpegts_resync(ByteIOContext *pb)

  1066. {

  1067.     int c, i;

  1068. 

  1069.     for(i = 0;i < MAX_RESYNC_SIZE; i++) {

  1070.         c = url_fgetc(pb);

  1071.         if (c < 0)

  1072.             return -1;

  1073.         if (c == 0x47) {

  1074.             url_fseek(pb, -1, SEEK_CUR);

  1075.             return 0;

  1076.         }

  1077.     }

  1078.     /* no sync found */

  1079.     return -1;

  1080. }

  1081. 

  1082. /* return -1 if error or EOF. Return 0 if OK. */

  1083. static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)

  1084. {

  1085.     int skip, len;

  1086. 

  1087.     for(;;) {

  1088.         len = get_buffer(pb, buf, TS_PACKET_SIZE);

  1089.         if (len != TS_PACKET_SIZE)

  1090.             return AVERROR_IO;

  1091.         /* check paquet sync byte */

  1092.         if (buf[0] != 0x47) {

  1093.             /* find a new packet start */

  1094.             url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);

  1095.             if (mpegts_resync(pb) < 0)

  1096.                 return AVERROR_INVALIDDATA;

  1097.             else

  1098.                 continue;

  1099.         } else {

  1100.             skip = raw_packet_size - TS_PACKET_SIZE;

  1101.             if (skip > 0)

  1102.                 url_fskip(pb, skip);

  1103.             break;

  1104.         }

  1105.     }

  1106.     return 0;

  1107. }

  1108. 

  1109. static int handle_packets(MpegTSContext *ts, int nb_packets)

  1110. {

  1111.     AVFormatContext *s = ts->stream;

  1112.     ByteIOContext *pb = &s->pb;

  1113.     uint8_t packet[TS_PACKET_SIZE];

  1114.     int packet_num, ret;

  1115. 

  1116.     ts->stop_parse = 0;

  1117.     packet_num = 0;

  1118.     for(;;) {

  1119.         if (ts->stop_parse)

  1120.             break;

  1121.         packet_num++;

  1122.         if (nb_packets != 0 && packet_num >= nb_packets)

  1123.             break;

  1124.         ret = read_packet(pb, packet, ts->raw_packet_size);

  1125.         if (ret != 0)

  1126.             return ret;

  1127.         handle_packet(ts, packet);

  1128.     }

  1129.     return 0;

  1130. }

  1131. 

  1132. static int mpegts_probe(AVProbeData *p)

  1133. {

  1134. #if 1

  1135.     const int size= p->buf_size;

  1136.     int score, fec_score, dvhs_score;

  1137. #define CHECK_COUNT 10

  1138. 

  1139.     if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))

  1140.         return -1;

  1141. 

  1142.     score    = analyze(p->buf, TS_PACKET_SIZE    *CHECK_COUNT, TS_PACKET_SIZE, NULL);

  1143.     dvhs_score  = analyze(p->buf, TS_DVHS_PACKET_SIZE    *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);

  1144.     fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);

  1145. //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);

  1146. 

  1147. // we need a clear definition for the returned score otherwise things will become messy sooner or later

  1148.     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;

  1149.     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;

  1150.     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;

  1151.     else                                    return -1;

  1152. #else

  1153.     /* only use the extension for safer guess */

  1154.     if (match_ext(p->filename, "ts"))

  1155.         return AVPROBE_SCORE_MAX;

  1156.     else

  1157.         return 0;

  1158. #endif

  1159. }

  1160. 

  1161. static void set_service_cb(void *opaque, int ret)

  1162. {

  1163.     MpegTSContext *ts = opaque;

  1164.     ts->stop_parse = 1;

  1165. }

  1166. 

  1167. /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return

  1168.    (-1) if not available */

  1169. static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,

  1170.                      const uint8_t *packet)

  1171. {

  1172.     int afc, len, flags;

  1173.     const uint8_t *p;

  1174.     unsigned int v;

  1175. 

  1176.     afc = (packet[3] >> 4) & 3;

  1177.     if (afc <= 1)

  1178.         return -1;

  1179.     p = packet + 4;

  1180.     len = p[0];

  1181.     p++;

  1182.     if (len == 0)

  1183.         return -1;

  1184.     flags = *p++;

  1185.     len--;

  1186.     if (!(flags & 0x10))

  1187.         return -1;

  1188.     if (len < 6)

  1189.         return -1;

  1190.     v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];

  1191.     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);

  1192.     *ppcr_low = ((p[4] & 1) << 8) | p[5];

  1193.     return 0;

  1194. }

  1195. 

  1196. static int mpegts_read_header(AVFormatContext *s,

  1197.                               AVFormatParameters *ap)

  1198. {

  1199.     MpegTSContext *ts = s->priv_data;

  1200.     ByteIOContext *pb = &s->pb;

  1201.     uint8_t buf[1024];

  1202.     int len, sid, i;

  1203.     int64_t pos;

  1204.     MpegTSService *service;

  1205. 

  1206.     if (ap) {

  1207.         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;

  1208.         if(ap->mpeg2ts_raw){

  1209.             av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");

  1210.             return -1;

  1211.         }

  1212.     }

  1213. 

  1214.     /* read the first 1024 bytes to get packet size */

  1215.     pos = url_ftell(pb);

  1216.     len = get_buffer(pb, buf, sizeof(buf));

  1217.     if (len != sizeof(buf))

  1218.         goto fail;

  1219.     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));

  1220.     if (ts->raw_packet_size <= 0)

  1221.         goto fail;

  1222.     ts->stream = s;

  1223.     ts->auto_guess = 0;

  1224. 

  1225.     if (s->iformat == &mpegts_demuxer) {

  1226.         /* normal demux */

  1227. 

  1228.         if (!ts->auto_guess) {

  1229.             /* first do a scaning to get all the services */

  1230.             url_fseek(pb, pos, SEEK_SET);

  1231.             mpegts_scan_sdt(ts);

  1232. 

  1233.             handle_packets(ts, s->probesize);

  1234. 

  1235.             if (ts->nb_services <= 0) {

  1236.                 /* no SDT found, we try to look at the PAT */

  1237. 

  1238.                 /* First remove the SDT filters from each PID */

  1239.                 int i;

  1240.                 for (i=0; i < NB_PID_MAX; i++) {

  1241.                     if (ts->pids[i])

  1242.                         mpegts_close_filter(ts, ts->pids[i]);

  1243.                 }

  1244.                 url_fseek(pb, pos, SEEK_SET);

  1245.                 mpegts_scan_pat(ts);

  1246. 

  1247.                 handle_packets(ts, s->probesize);

  1248.             }

  1249. 

  1250.             if (ts->nb_services <= 0) {

  1251.                 /* raw transport stream */

  1252.                 ts->auto_guess = 1;

  1253.                 s->ctx_flags |= AVFMTCTX_NOHEADER;

  1254.                 goto do_pcr;

  1255.             }

  1256. 

  1257.             /* tune to first service found */

  1258.             for(i=0; i<ts->nb_services; i++){

  1259.                 service = ts->services[i];

  1260.                 sid = service->sid;

  1261. #ifdef DEBUG_SI

  1262.                 av_log(ts->stream, AV_LOG_DEBUG, "tuning to '%s'\n", service->name);

  1263. #endif

  1264. 

  1265.                 /* now find the info for the first service if we found any,

  1266.                 otherwise try to filter all PATs */

  1267. 

  1268.                 url_fseek(pb, pos, SEEK_SET);

  1269.                 mpegts_set_service(ts, sid, set_service_cb, ts);

  1270. 

  1271.                 handle_packets(ts, s->probesize);

  1272.             }

  1273.             /* if could not find service, enable auto_guess */

  1274. 

  1275.                 ts->auto_guess = 1;

  1276. 

  1277. #ifdef DEBUG_SI

  1278.             av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");

  1279. #endif

  1280.         }

  1281.         s->ctx_flags |= AVFMTCTX_NOHEADER;

  1282.     } else {

  1283.         AVStream *st;

  1284.         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;

  1285.         int64_t pcrs[2], pcr_h;

  1286.         int packet_count[2];

  1287.         uint8_t packet[TS_PACKET_SIZE];

  1288. 

  1289.         /* only read packets */

  1290. 

  1291.     do_pcr:

  1292.         st = av_new_stream(s, 0);

  1293.         if (!st)

  1294.             goto fail;

  1295.         av_set_pts_info(st, 60, 1, 27000000);

  1296.         st->codec->codec_type = CODEC_TYPE_DATA;

  1297.         st->codec->codec_id = CODEC_ID_MPEG2TS;

  1298. 

  1299.         /* we iterate until we find two PCRs to estimate the bitrate */

  1300.         pcr_pid = -1;

  1301.         nb_pcrs = 0;

  1302.         nb_packets = 0;

  1303.         for(;;) {

  1304.             ret = read_packet(&s->pb, packet, ts->raw_packet_size);

  1305.             if (ret < 0)

  1306.                 return -1;

  1307.             pid = ((packet[1] & 0x1f) << 8) | packet[2];

  1308.             if ((pcr_pid == -1 || pcr_pid == pid) &&

  1309.                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {

  1310.                 pcr_pid = pid;

  1311.                 packet_count[nb_pcrs] = nb_packets;

  1312.                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;

  1313.                 nb_pcrs++;

  1314.                 if (nb_pcrs >= 2)

  1315.                     break;

  1316.             }

  1317.             nb_packets++;

  1318.         }

  1319.         ts->pcr_pid = pcr_pid;

  1320. 

  1321.         /* NOTE1: the bitrate is computed without the FEC */

  1322.         /* NOTE2: it is only the bitrate of the start of the stream */

  1323.         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);

  1324.         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];

  1325.         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;

  1326.         st->codec->bit_rate = s->bit_rate;

  1327.         st->start_time = ts->cur_pcr;

  1328. #if 0

  1329.         av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",

  1330.                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);

  1331. #endif

  1332.     }

  1333. 

  1334.     url_fseek(pb, pos, SEEK_SET);

  1335.     return 0;

  1336.  fail:

  1337.     return -1;

  1338. }

  1339. 

  1340. #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)

  1341. 

  1342. static int mpegts_raw_read_packet(AVFormatContext *s,

  1343.                                   AVPacket *pkt)

  1344. {

  1345.     MpegTSContext *ts = s->priv_data;

  1346.     int ret, i;

  1347.     int64_t pcr_h, next_pcr_h, pos;

  1348.     int pcr_l, next_pcr_l;

  1349.     uint8_t pcr_buf[12];

  1350. 

  1351.     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)

  1352.         return AVERROR(ENOMEM);

  1353.     pkt->pos= url_ftell(&s->pb);

  1354.     ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);

  1355.     if (ret < 0) {

  1356.         av_free_packet(pkt);

  1357.         return ret;

  1358.     }

  1359.     if (ts->mpeg2ts_compute_pcr) {

  1360.         /* compute exact PCR for each packet */

  1361.         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {

  1362.             /* we read the next PCR (XXX: optimize it by using a bigger buffer */

  1363.             pos = url_ftell(&s->pb);

  1364.             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {

  1365.                 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);

  1366.                 get_buffer(&s->pb, pcr_buf, 12);

  1367.                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {

  1368.                     /* XXX: not precise enough */

  1369.                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /

  1370.                         (i + 1);

  1371.                     break;

  1372.                 }

  1373.             }

  1374.             url_fseek(&s->pb, pos, SEEK_SET);

  1375.             /* no next PCR found: we use previous increment */

  1376.             ts->cur_pcr = pcr_h * 300 + pcr_l;

  1377.         }

  1378.         pkt->pts = ts->cur_pcr;

  1379.         pkt->duration = ts->pcr_incr;

  1380.         ts->cur_pcr += ts->pcr_incr;

  1381.     }

  1382.     pkt->stream_index = 0;

  1383.     return 0;

  1384. }

  1385. 

  1386. static int mpegts_read_packet(AVFormatContext *s,

  1387.                               AVPacket *pkt)

  1388. {

  1389.     MpegTSContext *ts = s->priv_data;

  1390. 

  1391.     ts->pkt = pkt;

  1392.     return handle_packets(ts, 0);

  1393. }

  1394. 

  1395. static int mpegts_read_close(AVFormatContext *s)

  1396. {

  1397.     MpegTSContext *ts = s->priv_data;

  1398.     int i;

  1399.     for(i=0;i<NB_PID_MAX;i++)

  1400.         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);

  1401. 

  1402.     for(i = 0; i < ts->nb_services; i++){

  1403.         av_free(ts->services[i]->provider_name);

  1404.         av_free(ts->services[i]->name);

  1405.         av_free(ts->services[i]);

  1406.     }

  1407.     av_freep(&ts->services);

  1408. 

  1409.     return 0;

  1410. }

  1411. 

  1412. static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,

  1413.                               int64_t *ppos, int64_t pos_limit)

  1414. {

  1415.     MpegTSContext *ts = s->priv_data;

  1416.     int64_t pos, timestamp;

  1417.     uint8_t buf[TS_PACKET_SIZE];

  1418.     int pcr_l, pid;

  1419.     const int find_next= 1;

  1420.     pos = ((*ppos  + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;

  1421.     if (find_next) {

  1422.         for(;;) {

  1423.             url_fseek(&s->pb, pos, SEEK_SET);

  1424.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1425.                 return AV_NOPTS_VALUE;

  1426.             pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1427.             if (pid == ts->pcr_pid &&

  1428.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1429.                 break;

  1430.             }

  1431.             pos += ts->raw_packet_size;

  1432.         }

  1433.     } else {

  1434.         for(;;) {

  1435.             pos -= ts->raw_packet_size;

  1436.             if (pos < 0)

  1437.                 return AV_NOPTS_VALUE;

  1438.             url_fseek(&s->pb, pos, SEEK_SET);

  1439.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1440.                 return AV_NOPTS_VALUE;

  1441.             pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1442.             if (pid == ts->pcr_pid &&

  1443.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1444.                 break;

  1445.             }

  1446.         }

  1447.     }

  1448.     *ppos = pos;

  1449. 

  1450.     return timestamp;

  1451. }

  1452. 

  1453. static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){

  1454.     MpegTSContext *ts = s->priv_data;

  1455.     uint8_t buf[TS_PACKET_SIZE];

  1456.     int64_t pos;

  1457. 

  1458.     if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)

  1459.         return -1;

  1460. 

  1461.     pos= url_ftell(&s->pb);

  1462. 

  1463.     for(;;) {

  1464.         url_fseek(&s->pb, pos, SEEK_SET);

  1465.         if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1466.             return -1;

  1467. //        pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1468.         if(buf[1] & 0x40) break;

  1469.         pos += ts->raw_packet_size;

  1470.     }

  1471.     url_fseek(&s->pb, pos, SEEK_SET);

  1472. 

  1473.     return 0;

  1474. }

  1475. 

  1476. /**************************************************************/

  1477. /* parsing functions - called from other demuxers such as RTP */

  1478. 

  1479. MpegTSContext *mpegts_parse_open(AVFormatContext *s)

  1480. {

  1481.     MpegTSContext *ts;

  1482. 

  1483.     ts = av_mallocz(sizeof(MpegTSContext));

  1484.     if (!ts)

  1485.         return NULL;

  1486.     /* no stream case, currently used by RTP */

  1487.     ts->raw_packet_size = TS_PACKET_SIZE;

  1488.     ts->stream = s;

  1489.     ts->auto_guess = 1;

  1490.     return ts;

  1491. }

  1492. 

  1493. /* return the consumed length if a packet was output, or -1 if no

  1494.    packet is output */

  1495. int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,

  1496.                         const uint8_t *buf, int len)

  1497. {

  1498.     int len1;

  1499. 

  1500.     len1 = len;

  1501.     ts->pkt = pkt;

  1502.     ts->stop_parse = 0;

  1503.     for(;;) {

  1504.         if (ts->stop_parse)

  1505.             break;

  1506.         if (len < TS_PACKET_SIZE)

  1507.             return -1;

  1508.         if (buf[0] != 0x47) {

  1509.             buf++;

  1510.             len--;

  1511.         } else {

  1512.             handle_packet(ts, buf);

  1513.             buf += TS_PACKET_SIZE;

  1514.             len -= TS_PACKET_SIZE;

  1515.         }

  1516.     }

  1517.     return len1 - len;

  1518. }

  1519. 

  1520. void mpegts_parse_close(MpegTSContext *ts)

  1521. {

  1522.     int i;

  1523. 

  1524.     for(i=0;i<NB_PID_MAX;i++)

  1525.         av_free(ts->pids[i]);

  1526.     av_free(ts);

  1527. }

  1528. 

  1529. AVInputFormat mpegts_demuxer = {

  1530.     "mpegts",

  1531.     "MPEG2 transport stream format",

  1532.     sizeof(MpegTSContext),

  1533.     mpegts_probe,

  1534.     mpegts_read_header,

  1535.     mpegts_read_packet,

  1536.     mpegts_read_close,

  1537.     read_seek,

  1538.     mpegts_get_pcr,

  1539.     .flags = AVFMT_SHOW_IDS,

  1540. };

  1541. 

  1542. AVInputFormat mpegtsraw_demuxer = {

  1543.     "mpegtsraw",

  1544.     "MPEG2 raw transport stream format",

  1545.     sizeof(MpegTSContext),

  1546.     mpegts_probe,

  1547.     mpegts_read_header,

  1548.     mpegts_raw_read_packet,

  1549.     mpegts_read_close,

  1550.     read_seek,

  1551.     mpegts_get_pcr,

  1552.     .flags = AVFMT_SHOW_IDS,

  1553. };