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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. 

  25. //#define DEBUG_SI

  26. //#define DEBUG_SEEK

  27. 

  28. /* 1.0 second at 24Mbit/s */

  29. #define MAX_SCAN_PACKETS 32000

  30. 

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

  32.    synchronisation is lost */

  33. #define MAX_RESYNC_SIZE 4096

  34. 

  35. typedef struct PESContext PESContext;

  36. 

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

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

  39. 

  40. enum MpegTSFilterType {

  41.     MPEGTS_PES,

  42.     MPEGTS_SECTION,

  43. };

  44. 

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

  46. 

  47. typedef struct MpegTSPESFilter {

  48.     PESCallback *pes_cb;

  49.     void *opaque;

  50. } MpegTSPESFilter;

  51. 

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

  53. 

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

  55. 

  56. typedef struct MpegTSSectionFilter {

  57.     int section_index;

  58.     int section_h_size;

  59.     uint8_t *section_buf;

  60.     int check_crc:1;

  61.     int end_of_section_reached:1;

  62.     SectionCallback *section_cb;

  63.     void *opaque;

  64. } MpegTSSectionFilter;

  65. 

  66. typedef struct MpegTSFilter {

  67.     int pid;

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

  69.     enum MpegTSFilterType type;

  70.     union {

  71.         MpegTSPESFilter pes_filter;

  72.         MpegTSSectionFilter section_filter;

  73.     } u;

  74. } MpegTSFilter;

  75. 

  76. typedef struct MpegTSService {

  77.     int running:1;

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

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

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

  81. } MpegTSService;

  82. 

  83. struct MpegTSContext {

  84.     /* user data */

  85.     AVFormatContext *stream;

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

  87.     int raw_packet_size;

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

  89.     int auto_guess;

  90.     int set_service_ret;

  91. 

  92.     /** force raw MPEG2 transport stream output, if possible */

  93.     int mpeg2ts_raw;

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

  95.     int mpeg2ts_compute_pcr;

  96. 

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

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

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

  100. 

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

  102.     /** stop parsing loop                                    */

  103.     int stop_parse;

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

  105.     AVPacket *pkt;

  106. 

  107.     /******************************************/

  108.     /* private mpegts data */

  109.     /* scan context */

  110.     MpegTSFilter *sdt_filter;

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

  112.     int nb_services;

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

  114.     MpegTSService **services;

  115. 

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

  117.     SetServiceCallback *set_service_cb;

  118.     void *set_service_opaque;

  119.     /** filter for the PAT                                   */

  120.     MpegTSFilter *pat_filter;

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

  122.     MpegTSFilter *pmt_filter;

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

  124.     int req_sid;

  125. 

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

  127.     MpegTSFilter *pids[NB_PID_MAX];

  128. };

  129. 

  130. /**

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

  132.  *  function when they are complete.

  133.  */

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

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

  136. {

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

  138.     int len;

  139. 

  140.     if (is_start) {

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

  142.         tss->section_index = buf_size;

  143.         tss->section_h_size = -1;

  144.         tss->end_of_section_reached = 0;

  145.     } else {

  146.         if (tss->end_of_section_reached)

  147.             return;

  148.         len = 4096 - tss->section_index;

  149.         if (buf_size < len)

  150.             len = buf_size;

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

  152.         tss->section_index += len;

  153.     }

  154. 

  155.     /* compute section length if possible */

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

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

  158.         if (len > 4096)

  159.             return;

  160.         tss->section_h_size = len;

  161.     }

  162. 

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

  164.         tss->end_of_section_reached = 1;

  165.         if (!tss->check_crc ||

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

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

  168.     }

  169. }

  170. 

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

  172.                                          SectionCallback *section_cb, void *opaque,

  173.                                          int check_crc)

  174. 

  175. {

  176.     MpegTSFilter *filter;

  177.     MpegTSSectionFilter *sec;

  178. 

  179. #ifdef DEBUG_SI

  180.     av_log(NULL, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);

  181. #endif

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

  183.         return NULL;

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

  185.     if (!filter)

  186.         return NULL;

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

  188.     filter->type = MPEGTS_SECTION;

  189.     filter->pid = pid;

  190.     filter->last_cc = -1;

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

  192.     sec->section_cb = section_cb;

  193.     sec->opaque = opaque;

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

  195.     sec->check_crc = check_crc;

  196.     if (!sec->section_buf) {

  197.         av_free(filter);

  198.         return NULL;

  199.     }

  200.     return filter;

  201. }

  202. 

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

  204.                                      PESCallback *pes_cb,

  205.                                      void *opaque)

  206. {

  207.     MpegTSFilter *filter;

  208.     MpegTSPESFilter *pes;

  209. 

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

  211.         return NULL;

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

  213.     if (!filter)

  214.         return NULL;

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

  216.     filter->type = MPEGTS_PES;

  217.     filter->pid = pid;

  218.     filter->last_cc = -1;

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

  220.     pes->pes_cb = pes_cb;

  221.     pes->opaque = opaque;

  222.     return filter;

  223. }

  224. 

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

  226. {

  227.     int pid;

  228. 

  229.     pid = filter->pid;

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

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

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

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

  234. 

  235.     av_free(filter);

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

  237. }

  238. 

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

  240.     int stat[packet_size];

  241.     int i;

  242.     int x=0;

  243.     int best_score=0;

  244. 

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

  246. 

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

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

  249.             stat[x]++;

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

  251.                 best_score= stat[x];

  252.                 if(index) *index= x;

  253.             }

  254.         }

  255. 

  256.         x++;

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

  258.     }

  259. 

  260.     return best_score;

  261. }

  262. 

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

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

  265. {

  266.     int score, fec_score, dvhs_score;

  267. 

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

  269.         return -1;

  270. 

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

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

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

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

  275. 

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

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

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

  279.     else                       return -1;

  280. }

  281. 

  282. typedef struct SectionHeader {

  283.     uint8_t tid;

  284.     uint16_t id;

  285.     uint8_t version;

  286.     uint8_t sec_num;

  287.     uint8_t last_sec_num;

  288. } SectionHeader;

  289. 

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

  291. {

  292.     const uint8_t *p;

  293.     int c;

  294. 

  295.     p = *pp;

  296.     if (p >= p_end)

  297.         return -1;

  298.     c = *p++;

  299.     *pp = p;

  300.     return c;

  301. }

  302. 

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

  304. {

  305.     const uint8_t *p;

  306.     int c;

  307. 

  308.     p = *pp;

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

  310.         return -1;

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

  312.     p += 2;

  313.     *pp = p;

  314.     return c;

  315. }

  316. 

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

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

  319. {

  320.     int len;

  321.     const uint8_t *p;

  322.     char *str;

  323. 

  324.     p = *pp;

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

  326.     if (len < 0)

  327.         return NULL;

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

  329.         return NULL;

  330.     str = av_malloc(len + 1);

  331.     if (!str)

  332.         return NULL;

  333.     memcpy(str, p, len);

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

  335.     p += len;

  336.     *pp = p;

  337.     return str;

  338. }

  339. 

  340. static int parse_section_header(SectionHeader *h,

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

  342. {

  343.     int val;

  344. 

  345.     val = get8(pp, p_end);

  346.     if (val < 0)

  347.         return -1;

  348.     h->tid = val;

  349.     *pp += 2;

  350.     val = get16(pp, p_end);

  351.     if (val < 0)

  352.         return -1;

  353.     h->id = val;

  354.     val = get8(pp, p_end);

  355.     if (val < 0)

  356.         return -1;

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

  358.     val = get8(pp, p_end);

  359.     if (val < 0)

  360.         return -1;

  361.     h->sec_num = val;

  362.     val = get8(pp, p_end);

  363.     if (val < 0)

  364.         return -1;

  365.     h->last_sec_num = val;

  366.     return 0;

  367. }

  368. 

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

  370.                                   char *provider_name, char *name)

  371. {

  372.     MpegTSService *service;

  373. 

  374. #ifdef DEBUG_SI

  375.     av_log(NULL, AV_LOG_DEBUG, "new_service: "

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

  377.            sid, provider_name, name);

  378. #endif

  379. 

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

  381.     if (!service)

  382.         return NULL;

  383.     service->sid = sid;

  384.     service->provider_name = provider_name;

  385.     service->name = name;

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

  387.     return service;

  388. }

  389. 

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

  391. {

  392.     MpegTSContext *ts = opaque;

  393.     SectionHeader h1, *h = &h1;

  394.     PESContext *pes;

  395.     AVStream *st;

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

  397.     int program_info_length, pcr_pid, pid, stream_type;

  398.     int desc_list_len, desc_len, desc_tag;

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

  400.     char language[4];

  401. 

  402. #ifdef DEBUG_SI

  403.     av_log(NULL, AV_LOG_DEBUG, "PMT: len %i\n", section_len);

  404.     av_hex_dump(stdout, (uint8_t *)section, section_len);

  405. #endif

  406.     p_end = section + section_len - 4;

  407.     p = section;

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

  409.         return;

  410. #ifdef DEBUG_SI

  411.     av_log(NULL, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",

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

  413. #endif

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

  415.         return;

  416. 

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

  418.     if (pcr_pid < 0)

  419.         return;

  420.     ts->pcr_pid = pcr_pid;

  421. #ifdef DEBUG_SI

  422.     av_log(NULL, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);

  423. #endif

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

  425.     if (program_info_length < 0)

  426.         return;

  427.     p += program_info_length;

  428.     if (p >= p_end)

  429.         return;

  430.     for(;;) {

  431.         language[0] = 0;

  432.         st = 0;

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

  434.         if (stream_type < 0)

  435.             break;

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

  437.         if (pid < 0)

  438.             break;

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

  440.         if (desc_list_len < 0)

  441.             break;

  442.         desc_list_end = p + desc_list_len;

  443.         if (desc_list_end > p_end)

  444.             break;

  445.         for(;;) {

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

  447.             if (desc_tag < 0)

  448.                 break;

  449.             if (stream_type == STREAM_TYPE_PRIVATE_DATA) {

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

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

  452.                     stream_type = STREAM_TYPE_AUDIO_AC3;

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

  454.                     /* DVB DTS audio */

  455.                     stream_type = STREAM_TYPE_AUDIO_DTS;

  456.                 }

  457.             }

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

  459.             desc_end = p + desc_len;

  460.             if (desc_end > desc_list_end)

  461.                 break;

  462. #ifdef DEBUG_SI

  463.             av_log(NULL, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",

  464.                    desc_tag, desc_len);

  465. #endif

  466.             switch(desc_tag) {

  467.             case DVB_SUBT_DESCID:

  468.                 if (stream_type == STREAM_TYPE_PRIVATE_DATA)

  469.                     stream_type = STREAM_TYPE_SUBTITLE_DVB;

  470. 

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

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

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

  474.                 language[3] = 0;

  475.                 get8(&p, desc_end);

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

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

  478. 

  479.                 break;

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

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

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

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

  484.                 language[3] = 0;

  485.                 break;

  486.             default:

  487.                 break;

  488.             }

  489.             p = desc_end;

  490.         }

  491.         p = desc_list_end;

  492. 

  493. #ifdef DEBUG_SI

  494.         av_log(NULL, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",

  495.                stream_type, pid);

  496. #endif

  497. 

  498.         /* now create ffmpeg stream */

  499.         switch(stream_type) {

  500.         case STREAM_TYPE_AUDIO_MPEG1:

  501.         case STREAM_TYPE_AUDIO_MPEG2:

  502.         case STREAM_TYPE_VIDEO_MPEG1:

  503.         case STREAM_TYPE_VIDEO_MPEG2:

  504.         case STREAM_TYPE_VIDEO_MPEG4:

  505.         case STREAM_TYPE_VIDEO_H264:

  506.         case STREAM_TYPE_AUDIO_AAC:

  507.         case STREAM_TYPE_AUDIO_AC3:

  508.         case STREAM_TYPE_AUDIO_DTS:

  509.         case STREAM_TYPE_SUBTITLE_DVB:

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

  511.             if (pes)

  512.                 st = new_pes_av_stream(pes, 0);

  513.             break;

  514.         default:

  515.             /* we ignore the other streams */

  516.             break;

  517.         }

  518. 

  519.         if (st) {

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

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

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

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

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

  525.             }

  526. 

  527.             if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {

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

  529.             }

  530.         }

  531.     }

  532.     /* all parameters are there */

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

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

  535.     ts->pmt_filter = NULL;

  536. }

  537. 

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

  539. {

  540.     MpegTSContext *ts = opaque;

  541.     SectionHeader h1, *h = &h1;

  542.     const uint8_t *p, *p_end;

  543.     int sid, pmt_pid;

  544. 

  545. #ifdef DEBUG_SI

  546.     av_log(NULL, AV_LOG_DEBUG, "PAT:\n");

  547.     av_hex_dump(stdout, (uint8_t *)section, section_len);

  548. #endif

  549.     p_end = section + section_len - 4;

  550.     p = section;

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

  552.         return;

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

  554.         return;

  555. 

  556.     for(;;) {

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

  558.         if (sid < 0)

  559.             break;

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

  561.         if (pmt_pid < 0)

  562.             break;

  563. #ifdef DEBUG_SI

  564.         av_log(NULL, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);

  565. #endif

  566.         if (sid == 0x0000) {

  567.             /* NIT info */

  568.         } else {

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

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

  571.                                                             pmt_cb, ts, 1);

  572.                 goto found;

  573.             }

  574.         }

  575.     }

  576.     /* not found */

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

  578. 

  579.  found:

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

  581.     ts->pat_filter = NULL;

  582. }

  583. 

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

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

  586. {

  587.     MpegTSContext *ts = opaque;

  588.     SectionHeader h1, *h = &h1;

  589.     const uint8_t *p, *p_end;

  590.     int sid, pmt_pid;

  591.     char *provider_name, *name;

  592.     char buf[256];

  593. 

  594. #ifdef DEBUG_SI

  595.     av_log(NULL, AV_LOG_DEBUG, "PAT:\n");

  596.     av_hex_dump(stdout, (uint8_t *)section, section_len);

  597. #endif

  598.     p_end = section + section_len - 4;

  599.     p = section;

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

  601.         return;

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

  603.         return;

  604. 

  605.     for(;;) {

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

  607.         if (sid < 0)

  608.             break;

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

  610.         if (pmt_pid < 0)

  611.             break;

  612. #ifdef DEBUG_SI

  613.         av_log(NULL, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);

  614. #endif

  615.         if (sid == 0x0000) {

  616.             /* NIT info */

  617.         } else {

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

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

  620.             name = av_strdup(buf);

  621.             provider_name = av_strdup("");

  622.             if (name && provider_name) {

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

  624.             } else {

  625.                 av_freep(&name);

  626.                 av_freep(&provider_name);

  627.             }

  628.         }

  629.     }

  630.     ts->stop_parse = 1;

  631. 

  632.     /* remove filter */

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

  634.     ts->pat_filter = NULL;

  635. }

  636. 

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

  638.                         SetServiceCallback *set_service_cb, void *opaque)

  639. {

  640.     ts->set_service_cb = set_service_cb;

  641.     ts->set_service_opaque = opaque;

  642.     ts->req_sid = sid;

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

  644.                                                 pat_cb, ts, 1);

  645. }

  646. 

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

  648. {

  649.     MpegTSContext *ts = opaque;

  650.     SectionHeader h1, *h = &h1;

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

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

  653.     char *name, *provider_name;

  654. 

  655. #ifdef DEBUG_SI

  656.     av_log(NULL, AV_LOG_DEBUG, "SDT:\n");

  657.     av_hex_dump(stdout, (uint8_t *)section, section_len);

  658. #endif

  659. 

  660.     p_end = section + section_len - 4;

  661.     p = section;

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

  663.         return;

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

  665.         return;

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

  667.     if (onid < 0)

  668.         return;

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

  670.     if (val < 0)

  671.         return;

  672.     for(;;) {

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

  674.         if (sid < 0)

  675.             break;

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

  677.         if (val < 0)

  678.             break;

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

  680.         if (desc_list_len < 0)

  681.             break;

  682.         desc_list_end = p + desc_list_len;

  683.         if (desc_list_end > p_end)

  684.             break;

  685.         for(;;) {

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

  687.             if (desc_tag < 0)

  688.                 break;

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

  690.             desc_end = p + desc_len;

  691.             if (desc_end > desc_list_end)

  692.                 break;

  693. #ifdef DEBUG_SI

  694.             av_log(NULL, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",

  695.                    desc_tag, desc_len);

  696. #endif

  697.             switch(desc_tag) {

  698.             case 0x48:

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

  700.                 if (service_type < 0)

  701.                     break;

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

  703.                 if (!provider_name)

  704.                     break;

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

  706.                 if (!name)

  707.                     break;

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

  709.                 break;

  710.             default:

  711.                 break;

  712.             }

  713.             p = desc_end;

  714.         }

  715.         p = desc_list_end;

  716.     }

  717.     ts->stop_parse = 1;

  718. 

  719.     /* remove filter */

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

  721.     ts->sdt_filter = NULL;

  722. }

  723. 

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

  725. static void mpegts_scan_sdt(MpegTSContext *ts)

  726. {

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

  728.                                                 sdt_cb, ts, 1);

  729. }

  730. 

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

  732.    than nothing !) */

  733. static void mpegts_scan_pat(MpegTSContext *ts)

  734. {

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

  736.                                                 pat_scan_cb, ts, 1);

  737. }

  738. 

  739. /* TS stream handling */

  740. 

  741. enum MpegTSState {

  742.     MPEGTS_HEADER = 0,

  743.     MPEGTS_PESHEADER_FILL,

  744.     MPEGTS_PAYLOAD,

  745.     MPEGTS_SKIP,

  746. };

  747. 

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

  749. #define PES_START_SIZE 9

  750. #define MAX_PES_HEADER_SIZE (9 + 255)

  751. 

  752. struct PESContext {

  753.     int pid;

  754.     int stream_type;

  755.     MpegTSContext *ts;

  756.     AVFormatContext *stream;

  757.     AVStream *st;

  758.     enum MpegTSState state;

  759.     /* used to get the format */

  760.     int data_index;

  761.     int total_size;

  762.     int pes_header_size;

  763.     int64_t pts, dts;

  764.     uint8_t header[MAX_PES_HEADER_SIZE];

  765. };

  766. 

  767. static int64_t get_pts(const uint8_t *p)

  768. {

  769.     int64_t pts;

  770.     int val;

  771. 

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

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

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

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

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

  777.     return pts;

  778. }

  779. 

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

  781. static void mpegts_push_data(void *opaque,

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

  783. {

  784.     PESContext *pes = opaque;

  785.     MpegTSContext *ts = pes->ts;

  786.     const uint8_t *p;

  787.     int len, code;

  788. 

  789.     if (is_start) {

  790.         pes->state = MPEGTS_HEADER;

  791.         pes->data_index = 0;

  792.     }

  793.     p = buf;

  794.     while (buf_size > 0) {

  795.         switch(pes->state) {

  796.         case MPEGTS_HEADER:

  797.             len = PES_START_SIZE - pes->data_index;

  798.             if (len > buf_size)

  799.                 len = buf_size;

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

  801.             pes->data_index += len;

  802.             p += len;

  803.             buf_size -= len;

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

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

  806.                    decide */

  807. #if 0

  808.                 av_hex_dump(pes->header, pes->data_index);

  809. #endif

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

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

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

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

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

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

  816.                           (code == 0x1bd)))

  817.                         goto skip;

  818.                     if (!pes->st) {

  819.                         /* allocate stream */

  820.                         new_pes_av_stream(pes, code);

  821.                     }

  822.                     pes->state = MPEGTS_PESHEADER_FILL;

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

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

  825.                        unbounded */

  826.                     if (pes->total_size)

  827.                         pes->total_size += 6;

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

  829.                 } else {

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

  831.                     /* skip packet */

  832.                 skip:

  833.                     pes->state = MPEGTS_SKIP;

  834.                     continue;

  835.                 }

  836.             }

  837.             break;

  838.             /**********************************************/

  839.             /* PES packing parsing */

  840.         case MPEGTS_PESHEADER_FILL:

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

  842.             if (len > buf_size)

  843.                 len = buf_size;

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

  845.             pes->data_index += len;

  846.             p += len;

  847.             buf_size -= len;

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

  849.                 const uint8_t *r;

  850.                 unsigned int flags;

  851. 

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

  853.                 r = pes->header + 9;

  854.                 pes->pts = AV_NOPTS_VALUE;

  855.                 pes->dts = AV_NOPTS_VALUE;

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

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

  858.                     r += 5;

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

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

  861.                     r += 5;

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

  863.                     r += 5;

  864.                 }

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

  866.                 pes->state = MPEGTS_PAYLOAD;

  867.             }

  868.             break;

  869.         case MPEGTS_PAYLOAD:

  870.             if (pes->total_size) {

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

  872.                 if (len > buf_size)

  873.                     len = buf_size;

  874.             } else {

  875.                 len = buf_size;

  876.             }

  877.             if (len > 0) {

  878.                 AVPacket *pkt = ts->pkt;

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

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

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

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

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

  884.                     /* reset pts values */

  885.                     pes->pts = AV_NOPTS_VALUE;

  886.                     pes->dts = AV_NOPTS_VALUE;

  887.                     ts->stop_parse = 1;

  888.                     return;

  889.                 }

  890.             }

  891.             buf_size = 0;

  892.             break;

  893.         case MPEGTS_SKIP:

  894.             buf_size = 0;

  895.             break;

  896.         }

  897.     }

  898. }

  899. 

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

  901. {

  902.     AVStream *st;

  903.     int codec_type, codec_id;

  904. 

  905.     switch(pes->stream_type){

  906.     case STREAM_TYPE_AUDIO_MPEG1:

  907.     case STREAM_TYPE_AUDIO_MPEG2:

  908.         codec_type = CODEC_TYPE_AUDIO;

  909.         codec_id = CODEC_ID_MP3;

  910.         break;

  911.     case STREAM_TYPE_VIDEO_MPEG1:

  912.     case STREAM_TYPE_VIDEO_MPEG2:

  913.         codec_type = CODEC_TYPE_VIDEO;

  914.         codec_id = CODEC_ID_MPEG2VIDEO;

  915.         break;

  916.     case STREAM_TYPE_VIDEO_MPEG4:

  917.         codec_type = CODEC_TYPE_VIDEO;

  918.         codec_id = CODEC_ID_MPEG4;

  919.         break;

  920.     case STREAM_TYPE_VIDEO_H264:

  921.         codec_type = CODEC_TYPE_VIDEO;

  922.         codec_id = CODEC_ID_H264;

  923.         break;

  924.     case STREAM_TYPE_AUDIO_AAC:

  925.         codec_type = CODEC_TYPE_AUDIO;

  926.         codec_id = CODEC_ID_AAC;

  927.         break;

  928.     case STREAM_TYPE_AUDIO_AC3:

  929.         codec_type = CODEC_TYPE_AUDIO;

  930.         codec_id = CODEC_ID_AC3;

  931.         break;

  932.     case STREAM_TYPE_AUDIO_DTS:

  933.         codec_type = CODEC_TYPE_AUDIO;

  934.         codec_id = CODEC_ID_DTS;

  935.         break;

  936.     case STREAM_TYPE_SUBTITLE_DVB:

  937.         codec_type = CODEC_TYPE_SUBTITLE;

  938.         codec_id = CODEC_ID_DVB_SUBTITLE;

  939.         break;

  940.     default:

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

  942.             codec_type = CODEC_TYPE_AUDIO;

  943.             codec_id = CODEC_ID_MP2;

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

  945.             codec_type = CODEC_TYPE_AUDIO;

  946.             codec_id = CODEC_ID_AC3;

  947.         } else {

  948.             codec_type = CODEC_TYPE_VIDEO;

  949.             codec_id = CODEC_ID_MPEG1VIDEO;

  950.         }

  951.         break;

  952.     }

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

  954.     if (st) {

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

  956.         st->priv_data = pes;

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

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

  959.         st->need_parsing = 1;

  960.         pes->st = st;

  961.     }

  962.     return st;

  963. }

  964. 

  965. 

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

  967. {

  968.     MpegTSFilter *tss;

  969.     PESContext *pes;

  970. 

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

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

  973.     if (!pes)

  974.         return 0;

  975.     pes->ts = ts;

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

  977.     pes->pid = pid;

  978.     pes->stream_type = stream_type;

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

  980.     if (!tss) {

  981.         av_free(pes);

  982.         return 0;

  983.     }

  984.     return pes;

  985. }

  986. 

  987. /* handle one TS packet */

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

  989. {

  990.     AVFormatContext *s = ts->stream;

  991.     MpegTSFilter *tss;

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

  993.     const uint8_t *p, *p_end;

  994. 

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

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

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

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

  999.         add_pes_stream(ts, pid, 0);

  1000.         tss = ts->pids[pid];

  1001.     }

  1002.     if (!tss)

  1003.         return;

  1004. 

  1005.     /* continuity check (currently not used) */

  1006.     cc = (packet[3] & 0xf);

  1007.     cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));

  1008.     tss->last_cc = cc;

  1009. 

  1010.     /* skip adaptation field */

  1011.     afc = (packet[3] >> 4) & 3;

  1012.     p = packet + 4;

  1013.     if (afc == 0) /* reserved value */

  1014.         return;

  1015.     if (afc == 2) /* adaptation field only */

  1016.         return;

  1017.     if (afc == 3) {

  1018.         /* skip adapation field */

  1019.         p += p[0] + 1;

  1020.     }

  1021.     /* if past the end of packet, ignore */

  1022.     p_end = packet + TS_PACKET_SIZE;

  1023.     if (p >= p_end)

  1024.         return;

  1025. 

  1026.     if (tss->type == MPEGTS_SECTION) {

  1027.         if (is_start) {

  1028.             /* pointer field present */

  1029.             len = *p++;

  1030.             if (p + len > p_end)

  1031.                 return;

  1032.             if (len && cc_ok) {

  1033.                 /* write remaining section bytes */

  1034.                 write_section_data(s, tss,

  1035.                                    p, len, 0);

  1036.                 /* check whether filter has been closed */

  1037.                 if (!ts->pids[pid])

  1038.                     return;

  1039.             }

  1040.             p += len;

  1041.             if (p < p_end) {

  1042.                 write_section_data(s, tss,

  1043.                                    p, p_end - p, 1);

  1044.             }

  1045.         } else {

  1046.             if (cc_ok) {

  1047.                 write_section_data(s, tss,

  1048.                                    p, p_end - p, 0);

  1049.             }

  1050.         }

  1051.     } else {

  1052.         tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,

  1053.                                  p, p_end - p, is_start);

  1054.     }

  1055. }

  1056. 

  1057. /* XXX: try to find a better synchro over several packets (use

  1058.    get_packet_size() ?) */

  1059. static int mpegts_resync(ByteIOContext *pb)

  1060. {

  1061.     int c, i;

  1062. 

  1063.     for(i = 0;i < MAX_RESYNC_SIZE; i++) {

  1064.         c = url_fgetc(pb);

  1065.         if (c < 0)

  1066.             return -1;

  1067.         if (c == 0x47) {

  1068.             url_fseek(pb, -1, SEEK_CUR);

  1069.             return 0;

  1070.         }

  1071.     }

  1072.     /* no sync found */

  1073.     return -1;

  1074. }

  1075. 

  1076. /* return -1 if error or EOF. Return 0 if OK. */

  1077. static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)

  1078. {

  1079.     int skip, len;

  1080. 

  1081.     for(;;) {

  1082.         len = get_buffer(pb, buf, TS_PACKET_SIZE);

  1083.         if (len != TS_PACKET_SIZE)

  1084.             return AVERROR_IO;

  1085.         /* check paquet sync byte */

  1086.         if (buf[0] != 0x47) {

  1087.             /* find a new packet start */

  1088.             url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);

  1089.             if (mpegts_resync(pb) < 0)

  1090.                 return AVERROR_INVALIDDATA;

  1091.             else

  1092.                 continue;

  1093.         } else {

  1094.             skip = raw_packet_size - TS_PACKET_SIZE;

  1095.             if (skip > 0)

  1096.                 url_fskip(pb, skip);

  1097.             break;

  1098.         }

  1099.     }

  1100.     return 0;

  1101. }

  1102. 

  1103. static int handle_packets(MpegTSContext *ts, int nb_packets)

  1104. {

  1105.     AVFormatContext *s = ts->stream;

  1106.     ByteIOContext *pb = &s->pb;

  1107.     uint8_t packet[TS_PACKET_SIZE];

  1108.     int packet_num, ret;

  1109. 

  1110.     ts->stop_parse = 0;

  1111.     packet_num = 0;

  1112.     for(;;) {

  1113.         if (ts->stop_parse)

  1114.             break;

  1115.         packet_num++;

  1116.         if (nb_packets != 0 && packet_num >= nb_packets)

  1117.             break;

  1118.         ret = read_packet(pb, packet, ts->raw_packet_size);

  1119.         if (ret != 0)

  1120.             return ret;

  1121.         handle_packet(ts, packet);

  1122.     }

  1123.     return 0;

  1124. }

  1125. 

  1126. static int mpegts_probe(AVProbeData *p)

  1127. {

  1128. #if 1

  1129.     const int size= p->buf_size;

  1130.     int score, fec_score, dvhs_score;

  1131. #define CHECK_COUNT 10

  1132. 

  1133.     if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))

  1134.         return -1;

  1135. 

  1136.     score    = analyze(p->buf, TS_PACKET_SIZE    *CHECK_COUNT, TS_PACKET_SIZE, NULL);

  1137.     dvhs_score  = analyze(p->buf, TS_DVHS_PACKET_SIZE    *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);

  1138.     fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);

  1139. //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);

  1140. 

  1141. // we need a clear definition for the returned score otherwise things will become messy sooner or later

  1142.     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;

  1143.     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;

  1144.     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;

  1145.     else                                    return -1;

  1146. #else

  1147.     /* only use the extension for safer guess */

  1148.     if (match_ext(p->filename, "ts"))

  1149.         return AVPROBE_SCORE_MAX;

  1150.     else

  1151.         return 0;

  1152. #endif

  1153. }

  1154. 

  1155. static void set_service_cb(void *opaque, int ret)

  1156. {

  1157.     MpegTSContext *ts = opaque;

  1158.     ts->set_service_ret = ret;

  1159.     ts->stop_parse = 1;

  1160. }

  1161. 

  1162. /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return

  1163.    (-1) if not available */

  1164. static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,

  1165.                      const uint8_t *packet)

  1166. {

  1167.     int afc, len, flags;

  1168.     const uint8_t *p;

  1169.     unsigned int v;

  1170. 

  1171.     afc = (packet[3] >> 4) & 3;

  1172.     if (afc <= 1)

  1173.         return -1;

  1174.     p = packet + 4;

  1175.     len = p[0];

  1176.     p++;

  1177.     if (len == 0)

  1178.         return -1;

  1179.     flags = *p++;

  1180.     len--;

  1181.     if (!(flags & 0x10))

  1182.         return -1;

  1183.     if (len < 6)

  1184.         return -1;

  1185.     v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];

  1186.     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);

  1187.     *ppcr_low = ((p[4] & 1) << 8) | p[5];

  1188.     return 0;

  1189. }

  1190. 

  1191. static int mpegts_read_header(AVFormatContext *s,

  1192.                               AVFormatParameters *ap)

  1193. {

  1194.     MpegTSContext *ts = s->priv_data;

  1195.     ByteIOContext *pb = &s->pb;

  1196.     uint8_t buf[1024];

  1197.     int len, sid, i;

  1198.     int64_t pos;

  1199.     MpegTSService *service;

  1200. 

  1201.     if (ap) {

  1202.         ts->mpeg2ts_raw = ap->mpeg2ts_raw;

  1203.         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;

  1204.     }

  1205. 

  1206.     /* read the first 1024 bytes to get packet size */

  1207.     pos = url_ftell(pb);

  1208.     len = get_buffer(pb, buf, sizeof(buf));

  1209.     if (len != sizeof(buf))

  1210.         goto fail;

  1211.     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));

  1212.     if (ts->raw_packet_size <= 0)

  1213.         goto fail;

  1214.     ts->stream = s;

  1215.     ts->auto_guess = 0;

  1216. 

  1217. goto_auto_guess:

  1218.     if (!ts->mpeg2ts_raw) {

  1219.         /* normal demux */

  1220. 

  1221.         if (!ts->auto_guess) {

  1222.             ts->set_service_ret = -1;

  1223. 

  1224.             /* first do a scaning to get all the services */

  1225.             url_fseek(pb, pos, SEEK_SET);

  1226.             mpegts_scan_sdt(ts);

  1227. 

  1228.             handle_packets(ts, s->probesize);

  1229. 

  1230.             if (ts->nb_services <= 0) {

  1231.                 /* no SDT found, we try to look at the PAT */

  1232. 

  1233.                 /* First remove the SDT filters from each PID */

  1234.                 int i;

  1235.                 for (i=0; i < NB_PID_MAX; i++) {

  1236.                     if (ts->pids[i])

  1237.                         mpegts_close_filter(ts, ts->pids[i]);

  1238.                 }

  1239.                 url_fseek(pb, pos, SEEK_SET);

  1240.                 mpegts_scan_pat(ts);

  1241. 

  1242.                 handle_packets(ts, s->probesize);

  1243.             }

  1244. 

  1245.             if (ts->nb_services <= 0) {

  1246.                 /* raw transport stream */

  1247.                 ts->auto_guess = 1;

  1248.                 s->ctx_flags |= AVFMTCTX_NOHEADER;

  1249.                 goto do_pcr;

  1250.             }

  1251. 

  1252.             /* tune to first service found */

  1253.             for(i=0; i<ts->nb_services && ts->set_service_ret; i++){

  1254.                 service = ts->services[i];

  1255.                 sid = service->sid;

  1256. #ifdef DEBUG_SI

  1257.                 av_log(NULL, AV_LOG_DEBUG, "tuning to '%s'\n", service->name);

  1258. #endif

  1259. 

  1260.                 /* now find the info for the first service if we found any,

  1261.                 otherwise try to filter all PATs */

  1262. 

  1263.                 url_fseek(pb, pos, SEEK_SET);

  1264.                 mpegts_set_service(ts, sid, set_service_cb, ts);

  1265. 

  1266.                 handle_packets(ts, s->probesize);

  1267.             }

  1268.             /* if could not find service, exit */

  1269. 

  1270.             if (ts->set_service_ret != 0) {

  1271.                 if(ts->auto_guess)

  1272.                   return -1;

  1273.                 else {

  1274.                   //let's retry with auto_guess set

  1275.                  ts->auto_guess = 1;

  1276.                  goto goto_auto_guess;

  1277.                 }

  1278.             }

  1279. 

  1280. #ifdef DEBUG_SI

  1281.             av_log(NULL, AV_LOG_DEBUG, "tuning done\n");

  1282. #endif

  1283.         }

  1284.         s->ctx_flags |= AVFMTCTX_NOHEADER;

  1285.     } else {

  1286.         AVStream *st;

  1287.         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;

  1288.         int64_t pcrs[2], pcr_h;

  1289.         int packet_count[2];

  1290.         uint8_t packet[TS_PACKET_SIZE];

  1291. 

  1292.         /* only read packets */

  1293. 

  1294.     do_pcr:

  1295.         st = av_new_stream(s, 0);

  1296.         if (!st)

  1297.             goto fail;

  1298.         av_set_pts_info(st, 60, 1, 27000000);

  1299.         st->codec->codec_type = CODEC_TYPE_DATA;

  1300.         st->codec->codec_id = CODEC_ID_MPEG2TS;

  1301. 

  1302.         /* we iterate until we find two PCRs to estimate the bitrate */

  1303.         pcr_pid = -1;

  1304.         nb_pcrs = 0;

  1305.         nb_packets = 0;

  1306.         for(;;) {

  1307.             ret = read_packet(&s->pb, packet, ts->raw_packet_size);

  1308.             if (ret < 0)

  1309.                 return -1;

  1310.             pid = ((packet[1] & 0x1f) << 8) | packet[2];

  1311.             if ((pcr_pid == -1 || pcr_pid == pid) &&

  1312.                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {

  1313.                 pcr_pid = pid;

  1314.                 packet_count[nb_pcrs] = nb_packets;

  1315.                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;

  1316.                 nb_pcrs++;

  1317.                 if (nb_pcrs >= 2)

  1318.                     break;

  1319.             }

  1320.             nb_packets++;

  1321.         }

  1322.         ts->pcr_pid = pcr_pid;

  1323. 

  1324.         /* NOTE1: the bitrate is computed without the FEC */

  1325.         /* NOTE2: it is only the bitrate of the start of the stream */

  1326.         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);

  1327.         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];

  1328.         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;

  1329.         st->codec->bit_rate = s->bit_rate;

  1330.         st->start_time = ts->cur_pcr;

  1331. #if 0

  1332.         av_log(NULL, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",

  1333.                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);

  1334. #endif

  1335.     }

  1336. 

  1337.     url_fseek(pb, pos, SEEK_SET);

  1338.     return 0;

  1339.  fail:

  1340.     return -1;

  1341. }

  1342. 

  1343. #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)

  1344. 

  1345. static int mpegts_raw_read_packet(AVFormatContext *s,

  1346.                                   AVPacket *pkt)

  1347. {

  1348.     MpegTSContext *ts = s->priv_data;

  1349.     int ret, i;

  1350.     int64_t pcr_h, next_pcr_h, pos;

  1351.     int pcr_l, next_pcr_l;

  1352.     uint8_t pcr_buf[12];

  1353. 

  1354.     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)

  1355.         return -ENOMEM;

  1356.     pkt->pos= url_ftell(&s->pb);

  1357.     ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);

  1358.     if (ret < 0) {

  1359.         av_free_packet(pkt);

  1360.         return ret;

  1361.     }

  1362.     if (ts->mpeg2ts_compute_pcr) {

  1363.         /* compute exact PCR for each packet */

  1364.         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {

  1365.             /* we read the next PCR (XXX: optimize it by using a bigger buffer */

  1366.             pos = url_ftell(&s->pb);

  1367.             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {

  1368.                 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);

  1369.                 get_buffer(&s->pb, pcr_buf, 12);

  1370.                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {

  1371.                     /* XXX: not precise enough */

  1372.                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /

  1373.                         (i + 1);

  1374.                     break;

  1375.                 }

  1376.             }

  1377.             url_fseek(&s->pb, pos, SEEK_SET);

  1378.             /* no next PCR found: we use previous increment */

  1379.             ts->cur_pcr = pcr_h * 300 + pcr_l;

  1380.         }

  1381.         pkt->pts = ts->cur_pcr;

  1382.         pkt->duration = ts->pcr_incr;

  1383.         ts->cur_pcr += ts->pcr_incr;

  1384.     }

  1385.     pkt->stream_index = 0;

  1386.     return 0;

  1387. }

  1388. 

  1389. static int mpegts_read_packet(AVFormatContext *s,

  1390.                               AVPacket *pkt)

  1391. {

  1392.     MpegTSContext *ts = s->priv_data;

  1393. 

  1394.     if (!ts->mpeg2ts_raw) {

  1395.         ts->pkt = pkt;

  1396.         return handle_packets(ts, 0);

  1397.     } else {

  1398.         return mpegts_raw_read_packet(s, pkt);

  1399.     }

  1400. }

  1401. 

  1402. static int mpegts_read_close(AVFormatContext *s)

  1403. {

  1404.     MpegTSContext *ts = s->priv_data;

  1405.     int i;

  1406.     for(i=0;i<NB_PID_MAX;i++)

  1407.         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);

  1408. 

  1409.     for(i = 0; i < ts->nb_services; i++){

  1410.         av_free(ts->services[i]->provider_name);

  1411.         av_free(ts->services[i]->name);

  1412.         av_free(ts->services[i]);

  1413.     }

  1414.     av_freep(&ts->services);

  1415. 

  1416.     return 0;

  1417. }

  1418. 

  1419. static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,

  1420.                               int64_t *ppos, int64_t pos_limit)

  1421. {

  1422.     MpegTSContext *ts = s->priv_data;

  1423.     int64_t pos, timestamp;

  1424.     uint8_t buf[TS_PACKET_SIZE];

  1425.     int pcr_l, pid;

  1426.     const int find_next= 1;

  1427.     pos = ((*ppos  + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;

  1428.     if (find_next) {

  1429.         for(;;) {

  1430.             url_fseek(&s->pb, pos, SEEK_SET);

  1431.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1432.                 return AV_NOPTS_VALUE;

  1433.             pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1434.             if (pid == ts->pcr_pid &&

  1435.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1436.                 break;

  1437.             }

  1438.             pos += ts->raw_packet_size;

  1439.         }

  1440.     } else {

  1441.         for(;;) {

  1442.             pos -= ts->raw_packet_size;

  1443.             if (pos < 0)

  1444.                 return AV_NOPTS_VALUE;

  1445.             url_fseek(&s->pb, pos, SEEK_SET);

  1446.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1447.                 return AV_NOPTS_VALUE;

  1448.             pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1449.             if (pid == ts->pcr_pid &&

  1450.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1451.                 break;

  1452.             }

  1453.         }

  1454.     }

  1455.     *ppos = pos;

  1456. 

  1457.     return timestamp;

  1458. }

  1459. 

  1460. static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){

  1461.     MpegTSContext *ts = s->priv_data;

  1462.     uint8_t buf[TS_PACKET_SIZE];

  1463.     int64_t pos;

  1464. 

  1465.     if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)

  1466.         return -1;

  1467. 

  1468.     pos= url_ftell(&s->pb);

  1469. 

  1470.     for(;;) {

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

  1472.         if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1473.             return -1;

  1474. //        pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1475.         if(buf[1] & 0x40) break;

  1476.         pos += ts->raw_packet_size;

  1477.     }

  1478.     url_fseek(&s->pb, pos, SEEK_SET);

  1479. 

  1480.     return 0;

  1481. }

  1482. 

  1483. /**************************************************************/

  1484. /* parsing functions - called from other demuxers such as RTP */

  1485. 

  1486. MpegTSContext *mpegts_parse_open(AVFormatContext *s)

  1487. {

  1488.     MpegTSContext *ts;

  1489. 

  1490.     ts = av_mallocz(sizeof(MpegTSContext));

  1491.     if (!ts)

  1492.         return NULL;

  1493.     /* no stream case, currently used by RTP */

  1494.     ts->raw_packet_size = TS_PACKET_SIZE;

  1495.     ts->stream = s;

  1496.     ts->auto_guess = 1;

  1497.     return ts;

  1498. }

  1499. 

  1500. /* return the consumed length if a packet was output, or -1 if no

  1501.    packet is output */

  1502. int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,

  1503.                         const uint8_t *buf, int len)

  1504. {

  1505.     int len1;

  1506. 

  1507.     len1 = len;

  1508.     ts->pkt = pkt;

  1509.     ts->stop_parse = 0;

  1510.     for(;;) {

  1511.         if (ts->stop_parse)

  1512.             break;

  1513.         if (len < TS_PACKET_SIZE)

  1514.             return -1;

  1515.         if (buf[0] != 0x47) {

  1516.             buf++;

  1517.             len--;

  1518.         } else {

  1519.             handle_packet(ts, buf);

  1520.             buf += TS_PACKET_SIZE;

  1521.             len -= TS_PACKET_SIZE;

  1522.         }

  1523.     }

  1524.     return len1 - len;

  1525. }

  1526. 

  1527. void mpegts_parse_close(MpegTSContext *ts)

  1528. {

  1529.     int i;

  1530. 

  1531.     for(i=0;i<NB_PID_MAX;i++)

  1532.         av_free(ts->pids[i]);

  1533.     av_free(ts);

  1534. }

  1535. 

  1536. AVInputFormat mpegts_demuxer = {

  1537.     "mpegts",

  1538.     "MPEG2 transport stream format",

  1539.     sizeof(MpegTSContext),

  1540.     mpegts_probe,

  1541.     mpegts_read_header,

  1542.     mpegts_read_packet,

  1543.     mpegts_read_close,

  1544.     read_seek,

  1545.     mpegts_get_pcr,

  1546.     .flags = AVFMT_SHOW_IDS,

  1547. };