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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 pcr_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 struct MpegTSFilter MpegTSFilter;

  47. 

  48. typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start);

  49. 

  50. typedef struct MpegTSPESFilter {

  51.     PESCallback *pes_cb;

  52.     void *opaque;

  53. } MpegTSPESFilter;

  54. 

  55. typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);

  56. 

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

  58. 

  59. typedef struct MpegTSSectionFilter {

  60.     int section_index;

  61.     int section_h_size;

  62.     uint8_t *section_buf;

  63.     int check_crc:1;

  64.     int end_of_section_reached:1;

  65.     SectionCallback *section_cb;

  66.     void *opaque;

  67. } MpegTSSectionFilter;

  68. 

  69. struct MpegTSFilter {

  70.     int pid;

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

  72.     enum MpegTSFilterType type;

  73.     union {

  74.         MpegTSPESFilter pes_filter;

  75.         MpegTSSectionFilter section_filter;

  76.     } u;

  77. };

  78. 

  79. typedef struct MpegTSService {

  80.     int running:1;

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

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

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

  84. } MpegTSService;

  85. 

  86. struct MpegTSContext {

  87.     /* user data */

  88.     AVFormatContext *stream;

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

  90.     int raw_packet_size;

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

  92.     int auto_guess;

  93. 

  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. 

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

  101.     /** stop parsing loop                                    */

  102.     int stop_parse;

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

  104.     AVPacket *pkt;

  105. 

  106.     /******************************************/

  107.     /* private mpegts data */

  108.     /* scan context */

  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. 

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

  116.     MpegTSFilter *pids[NB_PID_MAX];

  117. };

  118. 

  119. /* TS stream handling */

  120. 

  121. enum MpegTSState {

  122.     MPEGTS_HEADER = 0,

  123.     MPEGTS_PESHEADER_FILL,

  124.     MPEGTS_PAYLOAD,

  125.     MPEGTS_SKIP,

  126. };

  127. 

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

  129. #define PES_START_SIZE 9

  130. #define MAX_PES_HEADER_SIZE (9 + 255)

  131. 

  132. struct PESContext {

  133.     int pid;

  134.     int pcr_pid; /**< if -1 then all packets containing PCR are considered */

  135.     int stream_type;

  136.     MpegTSContext *ts;

  137.     AVFormatContext *stream;

  138.     AVStream *st;

  139.     enum MpegTSState state;

  140.     /* used to get the format */

  141.     int data_index;

  142.     int total_size;

  143.     int pes_header_size;

  144.     int64_t pts, dts;

  145.     uint8_t header[MAX_PES_HEADER_SIZE];

  146. };

  147. 

  148. /**

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

  150.  *  function when they are complete.

  151.  */

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

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

  154. {

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

  156.     int len;

  157. 

  158.     if (is_start) {

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

  160.         tss->section_index = buf_size;

  161.         tss->section_h_size = -1;

  162.         tss->end_of_section_reached = 0;

  163.     } else {

  164.         if (tss->end_of_section_reached)

  165.             return;

  166.         len = 4096 - tss->section_index;

  167.         if (buf_size < len)

  168.             len = buf_size;

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

  170.         tss->section_index += len;

  171.     }

  172. 

  173.     /* compute section length if possible */

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

  175.         len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;

  176.         if (len > 4096)

  177.             return;

  178.         tss->section_h_size = len;

  179.     }

  180. 

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

  182.         tss->end_of_section_reached = 1;

  183.         if (!tss->check_crc ||

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

  185.             tss->section_cb(tss1, tss->section_buf, tss->section_h_size);

  186.     }

  187. }

  188. 

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

  190.                                          SectionCallback *section_cb, void *opaque,

  191.                                          int check_crc)

  192. 

  193. {

  194.     MpegTSFilter *filter;

  195.     MpegTSSectionFilter *sec;

  196. 

  197. #ifdef DEBUG_SI

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

  199. #endif

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

  201.         return NULL;

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

  203.     if (!filter)

  204.         return NULL;

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

  206.     filter->type = MPEGTS_SECTION;

  207.     filter->pid = pid;

  208.     filter->last_cc = -1;

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

  210.     sec->section_cb = section_cb;

  211.     sec->opaque = opaque;

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

  213.     sec->check_crc = check_crc;

  214.     if (!sec->section_buf) {

  215.         av_free(filter);

  216.         return NULL;

  217.     }

  218.     return filter;

  219. }

  220. 

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

  222.                                      PESCallback *pes_cb,

  223.                                      void *opaque)

  224. {

  225.     MpegTSFilter *filter;

  226.     MpegTSPESFilter *pes;

  227. 

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

  229.         return NULL;

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

  231.     if (!filter)

  232.         return NULL;

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

  234.     filter->type = MPEGTS_PES;

  235.     filter->pid = pid;

  236.     filter->last_cc = -1;

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

  238.     pes->pes_cb = pes_cb;

  239.     pes->opaque = opaque;

  240.     return filter;

  241. }

  242. 

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

  244. {

  245.     int pid;

  246. 

  247.     pid = filter->pid;

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

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

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

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

  252. 

  253.     av_free(filter);

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

  255. }

  256. 

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

  258.     int stat[packet_size];

  259.     int i;

  260.     int x=0;

  261.     int best_score=0;

  262. 

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

  264. 

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

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

  267.             stat[x]++;

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

  269.                 best_score= stat[x];

  270.                 if(index) *index= x;

  271.             }

  272.         }

  273. 

  274.         x++;

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

  276.     }

  277. 

  278.     return best_score;

  279. }

  280. 

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

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

  283. {

  284.     int score, fec_score, dvhs_score;

  285. 

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

  287.         return -1;

  288. 

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

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

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

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

  293. 

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

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

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

  297.     else                       return -1;

  298. }

  299. 

  300. typedef struct SectionHeader {

  301.     uint8_t tid;

  302.     uint16_t id;

  303.     uint8_t version;

  304.     uint8_t sec_num;

  305.     uint8_t last_sec_num;

  306. } SectionHeader;

  307. 

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

  309. {

  310.     const uint8_t *p;

  311.     int c;

  312. 

  313.     p = *pp;

  314.     if (p >= p_end)

  315.         return -1;

  316.     c = *p++;

  317.     *pp = p;

  318.     return c;

  319. }

  320. 

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

  322. {

  323.     const uint8_t *p;

  324.     int c;

  325. 

  326.     p = *pp;

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

  328.         return -1;

  329.     c = AV_RB16(p);

  330.     p += 2;

  331.     *pp = p;

  332.     return c;

  333. }

  334. 

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

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

  337. {

  338.     int len;

  339.     const uint8_t *p;

  340.     char *str;

  341. 

  342.     p = *pp;

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

  344.     if (len < 0)

  345.         return NULL;

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

  347.         return NULL;

  348.     str = av_malloc(len + 1);

  349.     if (!str)

  350.         return NULL;

  351.     memcpy(str, p, len);

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

  353.     p += len;

  354.     *pp = p;

  355.     return str;

  356. }

  357. 

  358. static int parse_section_header(SectionHeader *h,

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

  360. {

  361.     int val;

  362. 

  363.     val = get8(pp, p_end);

  364.     if (val < 0)

  365.         return -1;

  366.     h->tid = val;

  367.     *pp += 2;

  368.     val = get16(pp, p_end);

  369.     if (val < 0)

  370.         return -1;

  371.     h->id = val;

  372.     val = get8(pp, p_end);

  373.     if (val < 0)

  374.         return -1;

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

  376.     val = get8(pp, p_end);

  377.     if (val < 0)

  378.         return -1;

  379.     h->sec_num = val;

  380.     val = get8(pp, p_end);

  381.     if (val < 0)

  382.         return -1;

  383.     h->last_sec_num = val;

  384.     return 0;

  385. }

  386. 

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

  388.                                   char *provider_name, char *name)

  389. {

  390.     MpegTSService *service=NULL;

  391.     int i;

  392. 

  393. #ifdef DEBUG_SI

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

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

  396.            sid, provider_name, name);

  397. #endif

  398. 

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

  400.         if(ts->services[i]->sid == sid)

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

  402. 

  403.     if(!service){

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

  405.         if (!service)

  406.             return NULL;

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

  408.     }

  409.     service->sid = sid;

  410.     assert((!provider_name) == (!name));

  411.     if(name){

  412.         av_free(service->provider_name);

  413.         av_free(service->         name);

  414.         service->provider_name = provider_name;

  415.         service->         name =          name;

  416.     }

  417.     return service;

  418. }

  419. 

  420. static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)

  421. {

  422.     MpegTSContext *ts = filter->u.section_filter.opaque;

  423.     SectionHeader h1, *h = &h1;

  424.     PESContext *pes;

  425.     AVStream *st;

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

  427.     int program_info_length, pcr_pid, pid, stream_type;

  428.     int desc_list_len, desc_len, desc_tag;

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

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

  431. 

  432. #ifdef DEBUG_SI

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

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

  435. #endif

  436.     p_end = section + section_len - 4;

  437.     p = section;

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

  439.         return;

  440. #ifdef DEBUG_SI

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

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

  443. #endif

  444.     if (h->tid != PMT_TID)

  445.         return;

  446. 

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

  448.     if (pcr_pid < 0)

  449.         return;

  450. #ifdef DEBUG_SI

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

  452. #endif

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

  454.     if (program_info_length < 0)

  455.         return;

  456.     p += program_info_length;

  457.     if (p >= p_end)

  458.         return;

  459.     for(;;) {

  460.         language[0] = 0;

  461.         st = 0;

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

  463.         if (stream_type < 0)

  464.             break;

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

  466.         if (pid < 0)

  467.             break;

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

  469.         if (desc_list_len < 0)

  470.             break;

  471.         desc_list_end = p + desc_list_len;

  472.         if (desc_list_end > p_end)

  473.             break;

  474.         for(;;) {

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

  476.             if (desc_tag < 0)

  477.                 break;

  478.             if (stream_type == STREAM_TYPE_PRIVATE_DATA) {

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

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

  481.                     stream_type = STREAM_TYPE_AUDIO_AC3;

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

  483.                     /* DVB DTS audio */

  484.                     stream_type = STREAM_TYPE_AUDIO_DTS;

  485.                 }

  486.             }

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

  488.             desc_end = p + desc_len;

  489.             if (desc_end > desc_list_end)

  490.                 break;

  491. #ifdef DEBUG_SI

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

  493.                    desc_tag, desc_len);

  494. #endif

  495.             switch(desc_tag) {

  496.             case DVB_SUBT_DESCID:

  497.                 if (stream_type == STREAM_TYPE_PRIVATE_DATA)

  498.                     stream_type = STREAM_TYPE_SUBTITLE_DVB;

  499. 

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

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

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

  503.                 language[3] = 0;

  504.                 get8(&p, desc_end);

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

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

  507. 

  508.                 break;

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

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

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

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

  513.                 language[3] = 0;

  514.                 break;

  515.             default:

  516.                 break;

  517.             }

  518.             p = desc_end;

  519.         }

  520.         p = desc_list_end;

  521. 

  522. #ifdef DEBUG_SI

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

  524.                stream_type, pid);

  525. #endif

  526. 

  527.         /* now create ffmpeg stream */

  528.         switch(stream_type) {

  529.         case STREAM_TYPE_AUDIO_MPEG1:

  530.         case STREAM_TYPE_AUDIO_MPEG2:

  531.         case STREAM_TYPE_VIDEO_MPEG1:

  532.         case STREAM_TYPE_VIDEO_MPEG2:

  533.         case STREAM_TYPE_VIDEO_MPEG4:

  534.         case STREAM_TYPE_VIDEO_H264:

  535.         case STREAM_TYPE_VIDEO_VC1:

  536.         case STREAM_TYPE_AUDIO_AAC:

  537.         case STREAM_TYPE_AUDIO_AC3:

  538.         case STREAM_TYPE_AUDIO_DTS:

  539.         case STREAM_TYPE_SUBTITLE_DVB:

  540.             if(ts->pids[pid]){

  541.                 assert(ts->pids[pid]->type == MPEGTS_PES);

  542.                 pes= ts->pids[pid]->u.pes_filter.opaque;

  543.                 st= pes->st;

  544.             }else{

  545.                 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);

  546.                 if (pes)

  547.                     st = new_pes_av_stream(pes, 0);

  548.             }

  549.             break;

  550.         default:

  551.             /* we ignore the other streams */

  552.             break;

  553.         }

  554. 

  555.         if (st) {

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

  557.                 memcpy(st->language, language, 4);

  558.             }

  559. 

  560.             if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {

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

  562.             }

  563.         }

  564.     }

  565.     /* all parameters are there */

  566.     ts->stop_parse++;

  567.     mpegts_close_filter(ts, filter);

  568. }

  569. 

  570. static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)

  571. {

  572.     MpegTSContext *ts = filter->u.section_filter.opaque;

  573.     SectionHeader h1, *h = &h1;

  574.     const uint8_t *p, *p_end;

  575.     int sid, pmt_pid;

  576. 

  577. #ifdef DEBUG_SI

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

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

  580. #endif

  581.     p_end = section + section_len - 4;

  582.     p = section;

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

  584.         return;

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

  586.         return;

  587. 

  588.     for(;;) {

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

  590.         if (sid < 0)

  591.             break;

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

  593.         if (pmt_pid < 0)

  594.             break;

  595. #ifdef DEBUG_SI

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

  597. #endif

  598.         if (sid == 0x0000) {

  599.             /* NIT info */

  600.         } else {

  601.             new_service(ts, sid, NULL, NULL);

  602.             ts->stop_parse--;

  603.             mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);

  604.         }

  605.     }

  606.     /* not found */

  607.     ts->stop_parse++;

  608. 

  609.     mpegts_close_filter(ts, filter);

  610. }

  611. 

  612. static void mpegts_set_service(MpegTSContext *ts)

  613. {

  614.     mpegts_open_section_filter(ts, PAT_PID,

  615.                                                 pat_cb, ts, 1);

  616. }

  617. 

  618. static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)

  619. {

  620.     MpegTSContext *ts = filter->u.section_filter.opaque;

  621.     SectionHeader h1, *h = &h1;

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

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

  624.     char *name, *provider_name;

  625. 

  626. #ifdef DEBUG_SI

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

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

  629. #endif

  630. 

  631.     p_end = section + section_len - 4;

  632.     p = section;

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

  634.         return;

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

  636.         return;

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

  638.     if (onid < 0)

  639.         return;

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

  641.     if (val < 0)

  642.         return;

  643.     for(;;) {

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

  645.         if (sid < 0)

  646.             break;

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

  648.         if (val < 0)

  649.             break;

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

  651.         if (desc_list_len < 0)

  652.             break;

  653.         desc_list_end = p + desc_list_len;

  654.         if (desc_list_end > p_end)

  655.             break;

  656.         for(;;) {

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

  658.             if (desc_tag < 0)

  659.                 break;

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

  661.             desc_end = p + desc_len;

  662.             if (desc_end > desc_list_end)

  663.                 break;

  664. #ifdef DEBUG_SI

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

  666.                    desc_tag, desc_len);

  667. #endif

  668.             switch(desc_tag) {

  669.             case 0x48:

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

  671.                 if (service_type < 0)

  672.                     break;

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

  674.                 if (!provider_name)

  675.                     break;

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

  677.                 if (!name)

  678.                     break;

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

  680.                 break;

  681.             default:

  682.                 break;

  683.             }

  684.             p = desc_end;

  685.         }

  686.         p = desc_list_end;

  687.     }

  688. }

  689. 

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

  691. static void mpegts_scan_sdt(MpegTSContext *ts)

  692. {

  693.     mpegts_open_section_filter(ts, SDT_PID,

  694.                                                 sdt_cb, ts, 1);

  695. }

  696. 

  697. static int64_t get_pts(const uint8_t *p)

  698. {

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

  700.     pts |= (AV_RB16(p + 1) >> 1) << 15;

  701.     pts |=  AV_RB16(p + 3) >> 1;

  702.     return pts;

  703. }

  704. 

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

  706. static void mpegts_push_data(MpegTSFilter *filter,

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

  708. {

  709.     PESContext *pes = filter->u.pes_filter.opaque;

  710.     MpegTSContext *ts = pes->ts;

  711.     const uint8_t *p;

  712.     int len, code;

  713. 

  714.     if(!ts->pkt)

  715.         return;

  716. 

  717.     if (is_start) {

  718.         pes->state = MPEGTS_HEADER;

  719.         pes->data_index = 0;

  720.     }

  721.     p = buf;

  722.     while (buf_size > 0) {

  723.         switch(pes->state) {

  724.         case MPEGTS_HEADER:

  725.             len = PES_START_SIZE - pes->data_index;

  726.             if (len > buf_size)

  727.                 len = buf_size;

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

  729.             pes->data_index += len;

  730.             p += len;

  731.             buf_size -= len;

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

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

  734.                    decide */

  735. #if 0

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

  737. #endif

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

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

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

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

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

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

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

  745.                         goto skip;

  746.                     if (!pes->st) {

  747.                         /* allocate stream */

  748.                         new_pes_av_stream(pes, code);

  749.                     }

  750.                     pes->state = MPEGTS_PESHEADER_FILL;

  751.                     pes->total_size = AV_RB16(pes->header + 4);

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

  753.                        unbounded */

  754.                     if (pes->total_size)

  755.                         pes->total_size += 6;

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

  757.                 } else {

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

  759.                     /* skip packet */

  760.                 skip:

  761.                     pes->state = MPEGTS_SKIP;

  762.                     continue;

  763.                 }

  764.             }

  765.             break;

  766.             /**********************************************/

  767.             /* PES packing parsing */

  768.         case MPEGTS_PESHEADER_FILL:

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

  770.             if (len > buf_size)

  771.                 len = buf_size;

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

  773.             pes->data_index += len;

  774.             p += len;

  775.             buf_size -= len;

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

  777.                 const uint8_t *r;

  778.                 unsigned int flags;

  779. 

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

  781.                 r = pes->header + 9;

  782.                 pes->pts = AV_NOPTS_VALUE;

  783.                 pes->dts = AV_NOPTS_VALUE;

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

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

  786.                     r += 5;

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

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

  789.                     r += 5;

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

  791.                     r += 5;

  792.                 }

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

  794.                 pes->state = MPEGTS_PAYLOAD;

  795.             }

  796.             break;

  797.         case MPEGTS_PAYLOAD:

  798.             if (pes->total_size) {

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

  800.                 if (len > buf_size)

  801.                     len = buf_size;

  802.             } else {

  803.                 len = buf_size;

  804.             }

  805.             if (len > 0) {

  806.                 AVPacket *pkt = ts->pkt;

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

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

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

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

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

  812.                     /* reset pts values */

  813.                     pes->pts = AV_NOPTS_VALUE;

  814.                     pes->dts = AV_NOPTS_VALUE;

  815.                     ts->stop_parse = 1;

  816.                     return;

  817.                 }

  818.             }

  819.             buf_size = 0;

  820.             break;

  821.         case MPEGTS_SKIP:

  822.             buf_size = 0;

  823.             break;

  824.         }

  825.     }

  826. }

  827. 

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

  829. {

  830.     AVStream *st;

  831.     int codec_type, codec_id;

  832. 

  833.     switch(pes->stream_type){

  834.     case STREAM_TYPE_AUDIO_MPEG1:

  835.     case STREAM_TYPE_AUDIO_MPEG2:

  836.         codec_type = CODEC_TYPE_AUDIO;

  837.         codec_id = CODEC_ID_MP3;

  838.         break;

  839.     case STREAM_TYPE_VIDEO_MPEG1:

  840.     case STREAM_TYPE_VIDEO_MPEG2:

  841.         codec_type = CODEC_TYPE_VIDEO;

  842.         codec_id = CODEC_ID_MPEG2VIDEO;

  843.         break;

  844.     case STREAM_TYPE_VIDEO_MPEG4:

  845.         codec_type = CODEC_TYPE_VIDEO;

  846.         codec_id = CODEC_ID_MPEG4;

  847.         break;

  848.     case STREAM_TYPE_VIDEO_H264:

  849.         codec_type = CODEC_TYPE_VIDEO;

  850.         codec_id = CODEC_ID_H264;

  851.         break;

  852.     case STREAM_TYPE_VIDEO_VC1:

  853.         codec_type = CODEC_TYPE_VIDEO;

  854.         codec_id = CODEC_ID_VC1;

  855.         break;

  856.     case STREAM_TYPE_AUDIO_AAC:

  857.         codec_type = CODEC_TYPE_AUDIO;

  858.         codec_id = CODEC_ID_AAC;

  859.         break;

  860.     case STREAM_TYPE_AUDIO_AC3:

  861.         codec_type = CODEC_TYPE_AUDIO;

  862.         codec_id = CODEC_ID_AC3;

  863.         break;

  864.     case STREAM_TYPE_AUDIO_DTS:

  865.         codec_type = CODEC_TYPE_AUDIO;

  866.         codec_id = CODEC_ID_DTS;

  867.         break;

  868.     case STREAM_TYPE_SUBTITLE_DVB:

  869.         codec_type = CODEC_TYPE_SUBTITLE;

  870.         codec_id = CODEC_ID_DVB_SUBTITLE;

  871.         break;

  872.     default:

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

  874.             codec_type = CODEC_TYPE_AUDIO;

  875.             codec_id = CODEC_ID_MP2;

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

  877.             codec_type = CODEC_TYPE_AUDIO;

  878.             codec_id = CODEC_ID_AC3;

  879.         } else {

  880.             codec_type = CODEC_TYPE_VIDEO;

  881.             codec_id = CODEC_ID_MPEG1VIDEO;

  882.         }

  883.         break;

  884.     }

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

  886.     if (st) {

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

  888.         st->priv_data = pes;

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

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

  891.         st->need_parsing = AVSTREAM_PARSE_FULL;

  892.         pes->st = st;

  893.     }

  894.     return st;

  895. }

  896. 

  897. 

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

  899. {

  900.     MpegTSFilter *tss;

  901.     PESContext *pes;

  902. 

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

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

  905.     if (!pes)

  906.         return 0;

  907.     pes->ts = ts;

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

  909.     pes->pid = pid;

  910.     pes->pcr_pid = pcr_pid;

  911.     pes->stream_type = stream_type;

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

  913.     if (!tss) {

  914.         av_free(pes);

  915.         return 0;

  916.     }

  917.     return pes;

  918. }

  919. 

  920. /* handle one TS packet */

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

  922. {

  923.     AVFormatContext *s = ts->stream;

  924.     MpegTSFilter *tss;

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

  926.     const uint8_t *p, *p_end;

  927. 

  928.     pid = AV_RB16(packet + 1) & 0x1fff;

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

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

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

  932.         add_pes_stream(ts, pid, -1, 0);

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

  934.     }

  935.     if (!tss)

  936.         return;

  937. 

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

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

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

  941.     tss->last_cc = cc;

  942. 

  943.     /* skip adaptation field */

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

  945.     p = packet + 4;

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

  947.         return;

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

  949.         return;

  950.     if (afc == 3) {

  951.         /* skip adapation field */

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

  953.     }

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

  955.     p_end = packet + TS_PACKET_SIZE;

  956.     if (p >= p_end)

  957.         return;

  958. 

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

  960.         if (is_start) {

  961.             /* pointer field present */

  962.             len = *p++;

  963.             if (p + len > p_end)

  964.                 return;

  965.             if (len && cc_ok) {

  966.                 /* write remaining section bytes */

  967.                 write_section_data(s, tss,

  968.                                    p, len, 0);

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

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

  971.                     return;

  972.             }

  973.             p += len;

  974.             if (p < p_end) {

  975.                 write_section_data(s, tss,

  976.                                    p, p_end - p, 1);

  977.             }

  978.         } else {

  979.             if (cc_ok) {

  980.                 write_section_data(s, tss,

  981.                                    p, p_end - p, 0);

  982.             }

  983.         }

  984.     } else {

  985.         tss->u.pes_filter.pes_cb(tss,

  986.                                  p, p_end - p, is_start);

  987.     }

  988. }

  989. 

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

  991.    get_packet_size() ?) */

  992. static int mpegts_resync(ByteIOContext *pb)

  993. {

  994.     int c, i;

  995. 

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

  997.         c = url_fgetc(pb);

  998.         if (c < 0)

  999.             return -1;

  1000.         if (c == 0x47) {

  1001.             url_fseek(pb, -1, SEEK_CUR);

  1002.             return 0;

  1003.         }

  1004.     }

  1005.     /* no sync found */

  1006.     return -1;

  1007. }

  1008. 

  1009. /* return -1 if error or EOF. Return 0 if OK. */

  1010. static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)

  1011. {

  1012.     int skip, len;

  1013. 

  1014.     for(;;) {

  1015.         len = get_buffer(pb, buf, TS_PACKET_SIZE);

  1016.         if (len != TS_PACKET_SIZE)

  1017.             return AVERROR(EIO);

  1018.         /* check paquet sync byte */

  1019.         if (buf[0] != 0x47) {

  1020.             /* find a new packet start */

  1021.             url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);

  1022.             if (mpegts_resync(pb) < 0)

  1023.                 return AVERROR_INVALIDDATA;

  1024.             else

  1025.                 continue;

  1026.         } else {

  1027.             skip = raw_packet_size - TS_PACKET_SIZE;

  1028.             if (skip > 0)

  1029.                 url_fskip(pb, skip);

  1030.             break;

  1031.         }

  1032.     }

  1033.     return 0;

  1034. }

  1035. 

  1036. static int handle_packets(MpegTSContext *ts, int nb_packets)

  1037. {

  1038.     AVFormatContext *s = ts->stream;

  1039.     ByteIOContext *pb = &s->pb;

  1040.     uint8_t packet[TS_PACKET_SIZE];

  1041.     int packet_num, ret;

  1042. 

  1043.     ts->stop_parse = 0;

  1044.     packet_num = 0;

  1045.     for(;;) {

  1046.         if (ts->stop_parse>0)

  1047.             break;

  1048.         packet_num++;

  1049.         if (nb_packets != 0 && packet_num >= nb_packets)

  1050.             break;

  1051.         ret = read_packet(pb, packet, ts->raw_packet_size);

  1052.         if (ret != 0)

  1053.             return ret;

  1054.         handle_packet(ts, packet);

  1055.     }

  1056.     return 0;

  1057. }

  1058. 

  1059. static int mpegts_probe(AVProbeData *p)

  1060. {

  1061. #if 1

  1062.     const int size= p->buf_size;

  1063.     int score, fec_score, dvhs_score;

  1064. #define CHECK_COUNT 10

  1065. 

  1066.     if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))

  1067.         return -1;

  1068. 

  1069.     score    = analyze(p->buf, TS_PACKET_SIZE    *CHECK_COUNT, TS_PACKET_SIZE, NULL);

  1070.     dvhs_score  = analyze(p->buf, TS_DVHS_PACKET_SIZE    *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);

  1071.     fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);

  1072. //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);

  1073. 

  1074. // we need a clear definition for the returned score otherwise things will become messy sooner or later

  1075.     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;

  1076.     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;

  1077.     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;

  1078.     else                                    return -1;

  1079. #else

  1080.     /* only use the extension for safer guess */

  1081.     if (match_ext(p->filename, "ts"))

  1082.         return AVPROBE_SCORE_MAX;

  1083.     else

  1084.         return 0;

  1085. #endif

  1086. }

  1087. 

  1088. /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return

  1089.    (-1) if not available */

  1090. static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,

  1091.                      const uint8_t *packet)

  1092. {

  1093.     int afc, len, flags;

  1094.     const uint8_t *p;

  1095.     unsigned int v;

  1096. 

  1097.     afc = (packet[3] >> 4) & 3;

  1098.     if (afc <= 1)

  1099.         return -1;

  1100.     p = packet + 4;

  1101.     len = p[0];

  1102.     p++;

  1103.     if (len == 0)

  1104.         return -1;

  1105.     flags = *p++;

  1106.     len--;

  1107.     if (!(flags & 0x10))

  1108.         return -1;

  1109.     if (len < 6)

  1110.         return -1;

  1111.     v = AV_RB32(p);

  1112.     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);

  1113.     *ppcr_low = ((p[4] & 1) << 8) | p[5];

  1114.     return 0;

  1115. }

  1116. 

  1117. static int mpegts_read_header(AVFormatContext *s,

  1118.                               AVFormatParameters *ap)

  1119. {

  1120.     MpegTSContext *ts = s->priv_data;

  1121.     ByteIOContext *pb = &s->pb;

  1122.     uint8_t buf[1024];

  1123.     int len;

  1124.     int64_t pos;

  1125. 

  1126.     if (ap) {

  1127.         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;

  1128.         if(ap->mpeg2ts_raw){

  1129.             av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");

  1130.             return -1;

  1131.         }

  1132.     }

  1133. 

  1134.     /* read the first 1024 bytes to get packet size */

  1135.     pos = url_ftell(pb);

  1136.     len = get_buffer(pb, buf, sizeof(buf));

  1137.     if (len != sizeof(buf))

  1138.         goto fail;

  1139.     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));

  1140.     if (ts->raw_packet_size <= 0)

  1141.         goto fail;

  1142.     ts->stream = s;

  1143.     ts->auto_guess = 0;

  1144. 

  1145.     if (s->iformat == &mpegts_demuxer) {

  1146.         /* normal demux */

  1147. 

  1148.         /* first do a scaning to get all the services */

  1149.         url_fseek(pb, pos, SEEK_SET);

  1150.         mpegts_scan_sdt(ts);

  1151. 

  1152.         mpegts_set_service(ts);

  1153. 

  1154.         handle_packets(ts, s->probesize);

  1155.         /* if could not find service, enable auto_guess */

  1156. 

  1157.         ts->auto_guess = 1;

  1158. 

  1159. #ifdef DEBUG_SI

  1160.         av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");

  1161. #endif

  1162.         s->ctx_flags |= AVFMTCTX_NOHEADER;

  1163.     } else {

  1164.         AVStream *st;

  1165.         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;

  1166.         int64_t pcrs[2], pcr_h;

  1167.         int packet_count[2];

  1168.         uint8_t packet[TS_PACKET_SIZE];

  1169. 

  1170.         /* only read packets */

  1171. 

  1172.         st = av_new_stream(s, 0);

  1173.         if (!st)

  1174.             goto fail;

  1175.         av_set_pts_info(st, 60, 1, 27000000);

  1176.         st->codec->codec_type = CODEC_TYPE_DATA;

  1177.         st->codec->codec_id = CODEC_ID_MPEG2TS;

  1178. 

  1179.         /* we iterate until we find two PCRs to estimate the bitrate */

  1180.         pcr_pid = -1;

  1181.         nb_pcrs = 0;

  1182.         nb_packets = 0;

  1183.         for(;;) {

  1184.             ret = read_packet(&s->pb, packet, ts->raw_packet_size);

  1185.             if (ret < 0)

  1186.                 return -1;

  1187.             pid = AV_RB16(packet + 1) & 0x1fff;

  1188.             if ((pcr_pid == -1 || pcr_pid == pid) &&

  1189.                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {

  1190.                 pcr_pid = pid;

  1191.                 packet_count[nb_pcrs] = nb_packets;

  1192.                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;

  1193.                 nb_pcrs++;

  1194.                 if (nb_pcrs >= 2)

  1195.                     break;

  1196.             }

  1197.             nb_packets++;

  1198.         }

  1199. 

  1200.         /* NOTE1: the bitrate is computed without the FEC */

  1201.         /* NOTE2: it is only the bitrate of the start of the stream */

  1202.         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);

  1203.         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];

  1204.         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;

  1205.         st->codec->bit_rate = s->bit_rate;

  1206.         st->start_time = ts->cur_pcr;

  1207. #if 0

  1208.         av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",

  1209.                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);

  1210. #endif

  1211.     }

  1212. 

  1213.     url_fseek(pb, pos, SEEK_SET);

  1214.     return 0;

  1215.  fail:

  1216.     return -1;

  1217. }

  1218. 

  1219. #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)

  1220. 

  1221. static int mpegts_raw_read_packet(AVFormatContext *s,

  1222.                                   AVPacket *pkt)

  1223. {

  1224.     MpegTSContext *ts = s->priv_data;

  1225.     int ret, i;

  1226.     int64_t pcr_h, next_pcr_h, pos;

  1227.     int pcr_l, next_pcr_l;

  1228.     uint8_t pcr_buf[12];

  1229. 

  1230.     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)

  1231.         return AVERROR(ENOMEM);

  1232.     pkt->pos= url_ftell(&s->pb);

  1233.     ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);

  1234.     if (ret < 0) {

  1235.         av_free_packet(pkt);

  1236.         return ret;

  1237.     }

  1238.     if (ts->mpeg2ts_compute_pcr) {

  1239.         /* compute exact PCR for each packet */

  1240.         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {

  1241.             /* we read the next PCR (XXX: optimize it by using a bigger buffer */

  1242.             pos = url_ftell(&s->pb);

  1243.             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {

  1244.                 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);

  1245.                 get_buffer(&s->pb, pcr_buf, 12);

  1246.                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {

  1247.                     /* XXX: not precise enough */

  1248.                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /

  1249.                         (i + 1);

  1250.                     break;

  1251.                 }

  1252.             }

  1253.             url_fseek(&s->pb, pos, SEEK_SET);

  1254.             /* no next PCR found: we use previous increment */

  1255.             ts->cur_pcr = pcr_h * 300 + pcr_l;

  1256.         }

  1257.         pkt->pts = ts->cur_pcr;

  1258.         pkt->duration = ts->pcr_incr;

  1259.         ts->cur_pcr += ts->pcr_incr;

  1260.     }

  1261.     pkt->stream_index = 0;

  1262.     return 0;

  1263. }

  1264. 

  1265. static int mpegts_read_packet(AVFormatContext *s,

  1266.                               AVPacket *pkt)

  1267. {

  1268.     MpegTSContext *ts = s->priv_data;

  1269. 

  1270.     ts->pkt = pkt;

  1271.     return handle_packets(ts, 0);

  1272. }

  1273. 

  1274. static int mpegts_read_close(AVFormatContext *s)

  1275. {

  1276.     MpegTSContext *ts = s->priv_data;

  1277.     int i;

  1278.     for(i=0;i<NB_PID_MAX;i++)

  1279.         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);

  1280. 

  1281.     for(i = 0; i < ts->nb_services; i++){

  1282.         av_free(ts->services[i]->provider_name);

  1283.         av_free(ts->services[i]->name);

  1284.         av_free(ts->services[i]);

  1285.     }

  1286.     av_freep(&ts->services);

  1287. 

  1288.     return 0;

  1289. }

  1290. 

  1291. static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,

  1292.                               int64_t *ppos, int64_t pos_limit)

  1293. {

  1294.     MpegTSContext *ts = s->priv_data;

  1295.     int64_t pos, timestamp;

  1296.     uint8_t buf[TS_PACKET_SIZE];

  1297.     int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;

  1298.     const int find_next= 1;

  1299.     pos = ((*ppos  + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;

  1300.     if (find_next) {

  1301.         for(;;) {

  1302.             url_fseek(&s->pb, pos, SEEK_SET);

  1303.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1304.                 return AV_NOPTS_VALUE;

  1305.             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&

  1306.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1307.                 break;

  1308.             }

  1309.             pos += ts->raw_packet_size;

  1310.         }

  1311.     } else {

  1312.         for(;;) {

  1313.             pos -= ts->raw_packet_size;

  1314.             if (pos < 0)

  1315.                 return AV_NOPTS_VALUE;

  1316.             url_fseek(&s->pb, pos, SEEK_SET);

  1317.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1318.                 return AV_NOPTS_VALUE;

  1319.             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&

  1320.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1321.                 break;

  1322.             }

  1323.         }

  1324.     }

  1325.     *ppos = pos;

  1326. 

  1327.     return timestamp;

  1328. }

  1329. 

  1330. static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){

  1331.     MpegTSContext *ts = s->priv_data;

  1332.     uint8_t buf[TS_PACKET_SIZE];

  1333.     int64_t pos;

  1334. 

  1335.     if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)

  1336.         return -1;

  1337. 

  1338.     pos= url_ftell(&s->pb);

  1339. 

  1340.     for(;;) {

  1341.         url_fseek(&s->pb, pos, SEEK_SET);

  1342.         if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1343.             return -1;

  1344. //        pid = AV_RB16(buf + 1) & 0x1fff;

  1345.         if(buf[1] & 0x40) break;

  1346.         pos += ts->raw_packet_size;

  1347.     }

  1348.     url_fseek(&s->pb, pos, SEEK_SET);

  1349. 

  1350.     return 0;

  1351. }

  1352. 

  1353. /**************************************************************/

  1354. /* parsing functions - called from other demuxers such as RTP */

  1355. 

  1356. MpegTSContext *mpegts_parse_open(AVFormatContext *s)

  1357. {

  1358.     MpegTSContext *ts;

  1359. 

  1360.     ts = av_mallocz(sizeof(MpegTSContext));

  1361.     if (!ts)

  1362.         return NULL;

  1363.     /* no stream case, currently used by RTP */

  1364.     ts->raw_packet_size = TS_PACKET_SIZE;

  1365.     ts->stream = s;

  1366.     ts->auto_guess = 1;

  1367.     return ts;

  1368. }

  1369. 

  1370. /* return the consumed length if a packet was output, or -1 if no

  1371.    packet is output */

  1372. int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,

  1373.                         const uint8_t *buf, int len)

  1374. {

  1375.     int len1;

  1376. 

  1377.     len1 = len;

  1378.     ts->pkt = pkt;

  1379.     ts->stop_parse = 0;

  1380.     for(;;) {

  1381.         if (ts->stop_parse>0)

  1382.             break;

  1383.         if (len < TS_PACKET_SIZE)

  1384.             return -1;

  1385.         if (buf[0] != 0x47) {

  1386.             buf++;

  1387.             len--;

  1388.         } else {

  1389.             handle_packet(ts, buf);

  1390.             buf += TS_PACKET_SIZE;

  1391.             len -= TS_PACKET_SIZE;

  1392.         }

  1393.     }

  1394.     return len1 - len;

  1395. }

  1396. 

  1397. void mpegts_parse_close(MpegTSContext *ts)

  1398. {

  1399.     int i;

  1400. 

  1401.     for(i=0;i<NB_PID_MAX;i++)

  1402.         av_free(ts->pids[i]);

  1403.     av_free(ts);

  1404. }

  1405. 

  1406. AVInputFormat mpegts_demuxer = {

  1407.     "mpegts",

  1408.     "MPEG2 transport stream format",

  1409.     sizeof(MpegTSContext),

  1410.     mpegts_probe,

  1411.     mpegts_read_header,

  1412.     mpegts_read_packet,

  1413.     mpegts_read_close,

  1414.     read_seek,

  1415.     mpegts_get_pcr,

  1416.     .flags = AVFMT_SHOW_IDS,

  1417. };

  1418. 

  1419. AVInputFormat mpegtsraw_demuxer = {

  1420.     "mpegtsraw",

  1421.     "MPEG2 raw transport stream format",

  1422.     sizeof(MpegTSContext),

  1423.     mpegts_probe,

  1424.     mpegts_read_header,

  1425.     mpegts_raw_read_packet,

  1426.     mpegts_read_close,

  1427.     read_seek,

  1428.     mpegts_get_pcr,

  1429.     .flags = AVFMT_SHOW_IDS,

  1430. };