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FFmpeg/libavformat/mpegts.c

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  1. /*

  2.  * MPEG2 transport stream (aka DVB) demux

  3.  * Copyright (c) 2002-2003 Fabrice Bellard.

  4.  *

  5.  * This library is free software; you can redistribute it and/or

  6.  * modify it under the terms of the GNU Lesser General Public

  7.  * License as published by the Free Software Foundation; either

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU Lesser General Public

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  */

  19. #include "avformat.h"

  20. 

  21. #include "mpegts.h"

  22. 

  23. //#define DEBUG_SI

  24. //#define DEBUG_SEEK

  25. 

  26. /* 1.0 second at 24Mbit/s */

  27. #define MAX_SCAN_PACKETS 32000

  28. 

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

  30.    synchronisation is lost */

  31. #define MAX_RESYNC_SIZE 4096

  32. 

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

  34. 

  35. enum MpegTSFilterType {

  36.     MPEGTS_PES,

  37.     MPEGTS_SECTION,

  38. };

  39. 

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

  41. 

  42. typedef struct MpegTSPESFilter {

  43.     PESCallback *pes_cb;

  44.     void *opaque;

  45. } MpegTSPESFilter;

  46. 

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

  48. 

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

  50. 

  51. typedef struct MpegTSSectionFilter {

  52.     int section_index;

  53.     int section_h_size;

  54.     uint8_t *section_buf;

  55.     int check_crc:1;

  56.     int end_of_section_reached:1;

  57.     SectionCallback *section_cb;

  58.     void *opaque;

  59. } MpegTSSectionFilter;

  60. 

  61. typedef struct MpegTSFilter {

  62.     int pid;

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

  64.     enum MpegTSFilterType type;

  65.     union {

  66.         MpegTSPESFilter pes_filter;

  67.         MpegTSSectionFilter section_filter;

  68.     } u;

  69. } MpegTSFilter;

  70. 

  71. typedef struct MpegTSService {

  72.     int running:1;

  73.     int sid;

  74.     char *provider_name;

  75.     char *name;

  76. } MpegTSService;

  77. 

  78. struct MpegTSContext {

  79.     /* user data */

  80.     AVFormatContext *stream;

  81.     int raw_packet_size; /* raw packet size, including FEC if present */

  82.     int auto_guess; /* if true, all pids are analized to find streams */

  83.     int set_service_ret;

  84. 

  85.     int mpeg2ts_raw;  /* force raw MPEG2 transport stream output, if possible */

  86.     int mpeg2ts_compute_pcr; /* compute exact PCR for each transport stream packet */

  87. 

  88.     /* used to estimate the exact PCR */

  89.     int64_t cur_pcr;

  90.     int pcr_incr;

  91.     int pcr_pid;

  92.     

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

  94.     int stop_parse; /* stop parsing loop */

  95.     AVPacket *pkt; /* packet containing av data */

  96. 

  97.     /******************************************/

  98.     /* private mpegts data */

  99.     /* scan context */

  100.     MpegTSFilter *sdt_filter;

  101.     int nb_services;

  102.     MpegTSService **services;

  103.     

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

  105.     SetServiceCallback *set_service_cb;

  106.     void *set_service_opaque;

  107.     MpegTSFilter *pat_filter;

  108.     MpegTSFilter *pmt_filter;

  109.     int req_sid;

  110. 

  111.     MpegTSFilter *pids[NB_PID_MAX];

  112. };

  113. 

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

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

  116. {

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

  118.     int len;

  119.     unsigned int crc;

  120.     

  121.     if (is_start) {

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

  123.         tss->section_index = buf_size;

  124.         tss->section_h_size = -1;

  125.         tss->end_of_section_reached = 0;

  126.     } else {

  127.         if (tss->end_of_section_reached)

  128.             return;

  129.         len = 4096 - tss->section_index;

  130.         if (buf_size < len)

  131.             len = buf_size;

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

  133.         tss->section_index += len;

  134.     }

  135. 

  136.     /* compute section length if possible */

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

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

  139.         if (len > 4096)

  140.             return;

  141.         tss->section_h_size = len;

  142.     }

  143. 

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

  145.         if (tss->check_crc) {

  146.             crc = mpegts_crc32(tss->section_buf, tss->section_h_size);

  147.             if (crc != 0)

  148.                 goto invalid_crc;

  149.         }

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

  151.     invalid_crc:

  152.         tss->end_of_section_reached = 1;

  153.     }

  154. }

  155. 

  156. MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, 

  157.                                          SectionCallback *section_cb, void *opaque,

  158.                                          int check_crc)

  159. 

  160. {

  161.     MpegTSFilter *filter;

  162.     MpegTSSectionFilter *sec;

  163.     

  164. #ifdef DEBUG_SI

  165.     printf("Filter: pid=0x%x\n", pid);

  166. #endif

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

  168.         return NULL;

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

  170.     if (!filter) 

  171.         return NULL;

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

  173.     filter->type = MPEGTS_SECTION;

  174.     filter->pid = pid;

  175.     filter->last_cc = -1;

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

  177.     sec->section_cb = section_cb;

  178.     sec->opaque = opaque;

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

  180.     sec->check_crc = check_crc;

  181.     if (!sec->section_buf) {

  182.         av_free(filter);

  183.         return NULL;

  184.     }

  185.     return filter;

  186. }

  187. 

  188. MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, 

  189.                                      PESCallback *pes_cb,

  190.                                      void *opaque)

  191. {

  192.     MpegTSFilter *filter;

  193.     MpegTSPESFilter *pes;

  194. 

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

  196.         return NULL;

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

  198.     if (!filter) 

  199.         return NULL;

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

  201.     filter->type = MPEGTS_PES;

  202.     filter->pid = pid;

  203.     filter->last_cc = -1;

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

  205.     pes->pes_cb = pes_cb;

  206.     pes->opaque = opaque;

  207.     return filter;

  208. }

  209. 

  210. void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)

  211. {

  212.     int pid;

  213. 

  214.     pid = filter->pid;

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

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

  217.     av_free(filter);

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

  219. }

  220. 

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

  222.     int stat[packet_size];

  223.     int i;

  224.     int x=0;

  225.     int best_score=0;

  226. 

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

  228. 

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

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

  231.             stat[x]++;

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

  233.                 best_score= stat[x];

  234.                 if(index) *index= x;

  235.             }

  236.         }

  237. 

  238.         x++;

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

  240.     }

  241. 

  242.     return best_score;

  243. }

  244. 

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

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

  247. {

  248.     int score, fec_score;

  249. 

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

  251.         return -1;

  252.         

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

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

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

  256.     

  257.     if     (score > fec_score) return TS_PACKET_SIZE;

  258.     else if(score < fec_score) return TS_FEC_PACKET_SIZE;

  259.     else                       return -1;

  260. }

  261. 

  262. typedef struct SectionHeader {

  263.     uint8_t tid;

  264.     uint16_t id;

  265.     uint8_t version;

  266.     uint8_t sec_num;

  267.     uint8_t last_sec_num;

  268. } SectionHeader;

  269. 

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

  271. {

  272.     const uint8_t *p;

  273.     int c;

  274. 

  275.     p = *pp;

  276.     if (p >= p_end)

  277.         return -1;

  278.     c = *p++;

  279.     *pp = p;

  280.     return c;

  281. }

  282. 

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

  284. {

  285.     const uint8_t *p;

  286.     int c;

  287. 

  288.     p = *pp;

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

  290.         return -1;

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

  292.     p += 2;

  293.     *pp = p;

  294.     return c;

  295. }

  296. 

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

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

  299. {

  300.     int len;

  301.     const uint8_t *p;

  302.     char *str;

  303. 

  304.     p = *pp;

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

  306.     if (len < 0)

  307.         return NULL;

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

  309.         return NULL;

  310.     str = av_malloc(len + 1);

  311.     if (!str)

  312.         return NULL;

  313.     memcpy(str, p, len);

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

  315.     p += len;

  316.     *pp = p;

  317.     return str;

  318. }

  319. 

  320. static int parse_section_header(SectionHeader *h, 

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

  322. {

  323.     int val;

  324. 

  325.     val = get8(pp, p_end);

  326.     if (val < 0)

  327.         return -1;

  328.     h->tid = val;

  329.     *pp += 2;

  330.     val = get16(pp, p_end);

  331.     if (val < 0)

  332.         return -1;

  333.     h->id = val;

  334.     val = get8(pp, p_end);

  335.     if (val < 0)

  336.         return -1;

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

  338.     val = get8(pp, p_end);

  339.     if (val < 0)

  340.         return -1;

  341.     h->sec_num = val;

  342.     val = get8(pp, p_end);

  343.     if (val < 0)

  344.         return -1;

  345.     h->last_sec_num = val;

  346.     return 0;

  347. }

  348. 

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

  350.                                   char *provider_name, char *name)

  351. {

  352.     MpegTSService *service;

  353. 

  354. #ifdef DEBUG_SI

  355.     printf("new_service: sid=0x%04x provider='%s' name='%s'\n", 

  356.            sid, provider_name, name);

  357. #endif

  358. 

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

  360.     if (!service)

  361.         return NULL;

  362.     service->sid = sid;

  363.     service->provider_name = provider_name;

  364.     service->name = name;

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

  366.     return service;

  367. }

  368. 

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

  370. {

  371.     MpegTSContext *ts = opaque;

  372.     SectionHeader h1, *h = &h1;

  373.     const uint8_t *p, *p_end;

  374.     int program_info_length, pcr_pid, pid, stream_type, desc_length;

  375.     

  376. #ifdef DEBUG_SI

  377.     printf("PMT:\n");

  378.     av_hex_dump((uint8_t *)section, section_len);

  379. #endif

  380.     p_end = section + section_len - 4;

  381.     p = section;

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

  383.         return;

  384. #ifdef DEBUG_SI

  385.     printf("sid=0x%x sec_num=%d/%d\n", h->id, h->sec_num, h->last_sec_num);

  386. #endif

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

  388.         return;

  389. 

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

  391.     if (pcr_pid < 0)

  392.         return;

  393.     ts->pcr_pid = pcr_pid;

  394. #ifdef DEBUG_SI

  395.     printf("pcr_pid=0x%x\n", pcr_pid);

  396. #endif

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

  398.     if (program_info_length < 0)

  399.         return;

  400.     p += program_info_length;

  401.     if (p >= p_end)

  402.         return;

  403.     for(;;) {

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

  405.         if (stream_type < 0)

  406.             break;

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

  408.         if (pid < 0)

  409.             break;

  410.         desc_length = get16(&p, p_end) & 0xfff;

  411.         if (desc_length < 0)

  412.             break;

  413.         p += desc_length;

  414.         if (p > p_end)

  415.             return;

  416. 

  417. #ifdef DEBUG_SI

  418.         printf("stream_type=%d pid=0x%x\n", stream_type, pid);

  419. #endif

  420. 

  421.         /* now create ffmpeg stream */

  422.         switch(stream_type) {

  423.         case STREAM_TYPE_AUDIO_MPEG1:

  424.         case STREAM_TYPE_AUDIO_MPEG2:

  425.         case STREAM_TYPE_VIDEO_MPEG1:

  426.         case STREAM_TYPE_VIDEO_MPEG2:

  427.         case STREAM_TYPE_VIDEO_MPEG4:

  428.         case STREAM_TYPE_VIDEO_H264:

  429.         case STREAM_TYPE_AUDIO_AAC:

  430.         case STREAM_TYPE_AUDIO_AC3:

  431.             add_pes_stream(ts, pid, stream_type);

  432.             break;

  433.         default:

  434.             /* we ignore the other streams */

  435.             break;

  436.         }

  437.     }

  438.     /* all parameters are there */

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

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

  441.     ts->pmt_filter = NULL;

  442. }

  443. 

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

  445. {

  446.     MpegTSContext *ts = opaque;

  447.     SectionHeader h1, *h = &h1;

  448.     const uint8_t *p, *p_end;

  449.     int sid, pmt_pid;

  450. 

  451. #ifdef DEBUG_SI

  452.     printf("PAT:\n");

  453.     av_hex_dump((uint8_t *)section, section_len);

  454. #endif

  455.     p_end = section + section_len - 4;

  456.     p = section;

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

  458.         return;

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

  460.         return;

  461. 

  462.     for(;;) {

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

  464.         if (sid < 0)

  465.             break;

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

  467.         if (pmt_pid < 0)

  468.             break;

  469. #ifdef DEBUG_SI

  470.         printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);

  471. #endif

  472.         if (sid == 0x0000) {

  473.             /* NIT info */

  474.         } else {

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

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

  477.                                                             pmt_cb, ts, 1);

  478.                 goto found;

  479.             }

  480.         }

  481.     }

  482.     /* not found */

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

  484. 

  485.  found:

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

  487.     ts->pat_filter = NULL;

  488. }

  489. 

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

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

  492. {

  493.     MpegTSContext *ts = opaque;

  494.     SectionHeader h1, *h = &h1;

  495.     const uint8_t *p, *p_end;

  496.     int sid, pmt_pid;

  497.     char *provider_name, *name;

  498.     char buf[256];

  499. 

  500. #ifdef DEBUG_SI

  501.     printf("PAT:\n");

  502.     av_hex_dump((uint8_t *)section, section_len);

  503. #endif

  504.     p_end = section + section_len - 4;

  505.     p = section;

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

  507.         return;

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

  509.         return;

  510. 

  511.     for(;;) {

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

  513.         if (sid < 0)

  514.             break;

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

  516.         if (pmt_pid < 0)

  517.             break;

  518. #ifdef DEBUG_SI

  519.         printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);

  520. #endif

  521.         if (sid == 0x0000) {

  522.             /* NIT info */

  523.         } else {

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

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

  526.             name = av_strdup(buf);

  527.             provider_name = av_strdup("");

  528.             if (name && provider_name) {

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

  530.             } else {

  531.                 av_freep(&name);

  532.                 av_freep(&provider_name);

  533.             }

  534.         }

  535.     }

  536.     ts->stop_parse = 1;

  537. 

  538.     /* remove filter */

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

  540.     ts->pat_filter = NULL;

  541. }

  542. 

  543. void mpegts_set_service(MpegTSContext *ts, int sid,

  544.                         SetServiceCallback *set_service_cb, void *opaque)

  545. {

  546.     ts->set_service_cb = set_service_cb;

  547.     ts->set_service_opaque = opaque;

  548.     ts->req_sid = sid;

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

  550.                                                 pat_cb, ts, 1);

  551. }

  552. 

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

  554. {

  555.     MpegTSContext *ts = opaque;

  556.     SectionHeader h1, *h = &h1;

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

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

  559.     char *name, *provider_name;

  560. 

  561. #ifdef DEBUG_SI

  562.     printf("SDT:\n");

  563.     av_hex_dump((uint8_t *)section, section_len);

  564. #endif

  565. 

  566.     p_end = section + section_len - 4;

  567.     p = section;

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

  569.         return;

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

  571.         return;

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

  573.     if (onid < 0)

  574.         return;

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

  576.     if (val < 0)

  577.         return;

  578.     for(;;) {

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

  580.         if (sid < 0)

  581.             break;

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

  583.         if (val < 0)

  584.             break;

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

  586.         if (desc_list_len < 0)

  587.             break;

  588.         desc_list_end = p + desc_list_len;

  589.         if (desc_list_end > p_end)

  590.             break;

  591.         for(;;) {

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

  593.             if (desc_tag < 0)

  594.                 break;

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

  596.             desc_end = p + desc_len;

  597.             if (desc_end > desc_list_end)

  598.                 break;

  599. #ifdef DEBUG_SI

  600.             printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);

  601. #endif

  602.             switch(desc_tag) {

  603.             case 0x48:

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

  605.                 if (service_type < 0)

  606.                     break;

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

  608.                 if (!provider_name)

  609.                     break;

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

  611.                 if (!name)

  612.                     break;

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

  614.                 break;

  615.             default:

  616.                 break;

  617.             }

  618.             p = desc_end;

  619.         }

  620.         p = desc_list_end;

  621.     }

  622.     ts->stop_parse = 1;

  623. 

  624.     /* remove filter */

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

  626.     ts->sdt_filter = NULL;

  627. }

  628. 

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

  630. void mpegts_scan_sdt(MpegTSContext *ts)

  631. {

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

  633.                                                 sdt_cb, ts, 1);

  634. }

  635. 

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

  637.    than nothing !) */

  638. void mpegts_scan_pat(MpegTSContext *ts)

  639. {

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

  641.                                                 pat_scan_cb, ts, 1);

  642. }

  643. 

  644. /* TS stream handling */

  645. 

  646. enum MpegTSState {

  647.     MPEGTS_HEADER = 0,

  648.     MPEGTS_PESHEADER_FILL,

  649.     MPEGTS_PAYLOAD,

  650.     MPEGTS_SKIP,

  651. };

  652. 

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

  654. #define PES_START_SIZE 9

  655. #define MAX_PES_HEADER_SIZE (9 + 255)

  656. 

  657. typedef struct PESContext {

  658.     int pid;

  659.     int stream_type;

  660.     MpegTSContext *ts;

  661.     AVFormatContext *stream;

  662.     AVStream *st;

  663.     enum MpegTSState state;

  664.     /* used to get the format */

  665.     int data_index;

  666.     int total_size;

  667.     int pes_header_size;

  668.     int64_t pts, dts;

  669.     uint8_t header[MAX_PES_HEADER_SIZE];

  670. } PESContext;

  671. 

  672. static int64_t get_pts(const uint8_t *p)

  673. {

  674.     int64_t pts;

  675.     int val;

  676. 

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

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

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

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

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

  682.     return pts;

  683. }

  684. 

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

  686. static void mpegts_push_data(void *opaque,

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

  688. {

  689.     PESContext *pes = opaque;

  690.     MpegTSContext *ts = pes->ts;

  691.     AVStream *st;

  692.     const uint8_t *p;

  693.     int len, code, codec_type, codec_id;

  694.     

  695.     if (is_start) {

  696.         pes->state = MPEGTS_HEADER;

  697.         pes->data_index = 0;

  698.     }

  699.     p = buf;

  700.     while (buf_size > 0) {

  701.         switch(pes->state) {

  702.         case MPEGTS_HEADER:

  703.             len = PES_START_SIZE - pes->data_index;

  704.             if (len > buf_size)

  705.                 len = buf_size;

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

  707.             pes->data_index += len;

  708.             p += len;

  709.             buf_size -= len;

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

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

  712.                    decide */

  713. #if 0

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

  715. #endif

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

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

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

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

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

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

  722.                           (code == 0x1bd)))

  723.                         goto skip;

  724.                     if (!pes->st) {

  725.                         /* allocate stream */

  726.                         switch(pes->stream_type){

  727.                         case STREAM_TYPE_AUDIO_MPEG1:

  728.                         case STREAM_TYPE_AUDIO_MPEG2:

  729.                             codec_type = CODEC_TYPE_AUDIO;

  730.                             codec_id = CODEC_ID_MP3;

  731.                             break;

  732.                         case STREAM_TYPE_VIDEO_MPEG1:

  733.                         case STREAM_TYPE_VIDEO_MPEG2:

  734.                             codec_type = CODEC_TYPE_VIDEO;

  735.                             codec_id = CODEC_ID_MPEG2VIDEO;

  736.                             break;

  737.                         case STREAM_TYPE_VIDEO_MPEG4:

  738.                             codec_type = CODEC_TYPE_VIDEO;

  739.                             codec_id = CODEC_ID_MPEG4;

  740.                             break;

  741.                         case STREAM_TYPE_VIDEO_H264:

  742.                             codec_type = CODEC_TYPE_VIDEO;

  743.                             codec_id = CODEC_ID_H264;

  744.                             break;

  745.                         case STREAM_TYPE_AUDIO_AAC:

  746.                             codec_type = CODEC_TYPE_AUDIO;

  747.                             codec_id = CODEC_ID_AAC;

  748.                             break;

  749.                         case STREAM_TYPE_AUDIO_AC3:

  750.                             codec_type = CODEC_TYPE_AUDIO;

  751.                             codec_id = CODEC_ID_AC3;

  752.                             break;

  753.                         default:

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

  755.                                 codec_type = CODEC_TYPE_AUDIO;

  756.                                 codec_id = CODEC_ID_MP2;

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

  758.                                 codec_type = CODEC_TYPE_AUDIO;

  759.                                 codec_id = CODEC_ID_AC3;

  760.                             } else {

  761.                                 codec_type = CODEC_TYPE_VIDEO;

  762.                                 codec_id = CODEC_ID_MPEG1VIDEO;

  763.                             }

  764.                             break;

  765.                         }

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

  767.                         if (st) {

  768.                             st->priv_data = pes;

  769.                             st->codec.codec_type = codec_type;

  770.                             st->codec.codec_id = codec_id;

  771.                             st->need_parsing = 1;

  772.                             pes->st = st;

  773.                         }

  774.                     }

  775.                     pes->state = MPEGTS_PESHEADER_FILL;

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

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

  778.                        unbounded */

  779.                     if (pes->total_size)

  780.                         pes->total_size += 6;

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

  782.                 } else {

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

  784.                     /* skip packet */

  785.                 skip:

  786.                     pes->state = MPEGTS_SKIP;

  787.                     continue;

  788.                 }

  789.             }

  790.             break;

  791.             /**********************************************/

  792.             /* PES packing parsing */

  793.         case MPEGTS_PESHEADER_FILL:

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

  795.             if (len > buf_size)

  796.                 len = buf_size;

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

  798.             pes->data_index += len;

  799.             p += len;

  800.             buf_size -= len;

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

  802.                 const uint8_t *r;

  803.                 unsigned int flags;

  804. 

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

  806.                 r = pes->header + 9;

  807.                 pes->pts = AV_NOPTS_VALUE;

  808.                 pes->dts = AV_NOPTS_VALUE;

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

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

  811.                     r += 5;

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

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

  814.                     r += 5;

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

  816.                     r += 5;

  817.                 }

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

  819.                 pes->state = MPEGTS_PAYLOAD;

  820.             }

  821.             break;

  822.         case MPEGTS_PAYLOAD:

  823.             if (pes->total_size) {

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

  825.                 if (len > buf_size)

  826.                     len = buf_size;

  827.             } else {

  828.                 len = buf_size;

  829.             }

  830.             if (len > 0) {

  831.                 AVPacket *pkt = ts->pkt;

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

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

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

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

  836.                     /* reset pts values */

  837.                     pes->pts = AV_NOPTS_VALUE;

  838.                     pes->dts = AV_NOPTS_VALUE;

  839.                     ts->stop_parse = 1;

  840.                     return;

  841.                 }

  842.             }

  843.             buf_size = 0;

  844.             break;

  845.         case MPEGTS_SKIP:

  846.             buf_size = 0;

  847.             break;

  848.         }

  849.     }

  850. }

  851. 

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

  853. {

  854.     MpegTSFilter *tss;

  855.     PESContext *pes;

  856. 

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

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

  859.     if (!pes)

  860.         return -1;

  861.     pes->ts = ts;

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

  863.     pes->pid = pid;

  864.     pes->stream_type = stream_type;

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

  866.     if (!tss) {

  867.         av_free(pes);

  868.         return -1;

  869.     }

  870.     return 0;

  871. }

  872. 

  873. /* handle one TS packet */

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

  875. {

  876.     AVFormatContext *s = ts->stream;

  877.     MpegTSFilter *tss;

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

  879.     const uint8_t *p, *p_end;

  880. 

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

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

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

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

  885.         add_pes_stream(ts, pid, 0);

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

  887.     }

  888.     if (!tss)

  889.         return;

  890. 

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

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

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

  894.     tss->last_cc = cc;

  895.     

  896.     /* skip adaptation field */

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

  898.     p = packet + 4;

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

  900.         return;

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

  902.         return;

  903.     if (afc == 3) {

  904.         /* skip adapation field */

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

  906.     }

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

  908.     p_end = packet + TS_PACKET_SIZE;

  909.     if (p >= p_end)

  910.         return;

  911.     

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

  913.         if (is_start) {

  914.             /* pointer field present */

  915.             len = *p++;

  916.             if (p + len > p_end)

  917.                 return;

  918.             if (len && cc_ok) {

  919.                 /* write remaning section bytes */

  920.                 write_section_data(s, tss, 

  921.                                    p, len, 0);

  922.             }

  923.             p += len;

  924.             if (p < p_end) {

  925.                 write_section_data(s, tss, 

  926.                                    p, p_end - p, 1);

  927.             }

  928.         } else {

  929.             if (cc_ok) {

  930.                 write_section_data(s, tss, 

  931.                                    p, p_end - p, 0);

  932.             }

  933.         }

  934.     } else {

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

  936.                                  p, p_end - p, is_start);

  937.     }

  938. }

  939. 

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

  941.    get_packet_size() ?) */

  942. static int mpegts_resync(ByteIOContext *pb)

  943. {

  944.     int c, i;

  945. 

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

  947.         c = url_fgetc(pb);

  948.         if (c < 0)

  949.             return -1;

  950.         if (c == 0x47) {

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

  952.             return 0;

  953.         }

  954.     }

  955.     /* no sync found */

  956.     return -1;

  957. }

  958. 

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

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

  961. {

  962.     int skip, len;

  963. 

  964.     for(;;) {

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

  966.         if (len != TS_PACKET_SIZE)

  967.             return AVERROR_IO;

  968.         /* check paquet sync byte */

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

  970.             /* find a new packet start */

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

  972.             if (mpegts_resync(pb) < 0)

  973.                 return AVERROR_INVALIDDATA;

  974.             else

  975.                 continue;

  976.         } else {

  977.             skip = raw_packet_size - TS_PACKET_SIZE;

  978.             if (skip > 0)

  979.                 url_fskip(pb, skip);

  980.             break;

  981.         }

  982.     }

  983.     return 0;

  984. }

  985. 

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

  987. {

  988.     AVFormatContext *s = ts->stream;

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

  990.     uint8_t packet[TS_PACKET_SIZE];

  991.     int packet_num, ret;

  992. 

  993.     ts->stop_parse = 0;

  994.     packet_num = 0;

  995.     for(;;) {

  996.         if (ts->stop_parse)

  997.             break;

  998.         packet_num++;

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

  1000.             break;

  1001.         ret = read_packet(pb, packet, ts->raw_packet_size);

  1002.         if (ret != 0)

  1003.             return ret;

  1004.         handle_packet(ts, packet);

  1005.     }

  1006.     return 0;

  1007. }

  1008. 

  1009. static int mpegts_probe(AVProbeData *p)

  1010. {

  1011. #if 1

  1012.     const int size= p->buf_size;

  1013.     int score, fec_score;

  1014. #define CHECK_COUNT 10

  1015.     

  1016.     if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))

  1017.         return -1;

  1018.     

  1019.     score    = analyze(p->buf, TS_PACKET_SIZE    *CHECK_COUNT, TS_PACKET_SIZE, NULL);

  1020.     fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);

  1021. //    av_log(NULL, AV_LOG_DEBUG, "score: %d, fec_score: %d \n", score, fec_score);

  1022.   

  1023. // we need a clear definition for the returned score otherwise things will become messy sooner or later

  1024.     if     (score > fec_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;

  1025.     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;

  1026.     else                                    return -1;

  1027. #else

  1028.     /* only use the extension for safer guess */

  1029.     if (match_ext(p->filename, "ts"))

  1030.         return AVPROBE_SCORE_MAX;

  1031.     else

  1032.         return 0;

  1033. #endif

  1034. }

  1035. 

  1036. void set_service_cb(void *opaque, int ret)

  1037. {

  1038.     MpegTSContext *ts = opaque;

  1039.     ts->set_service_ret = ret;

  1040.     ts->stop_parse = 1;

  1041. }

  1042. 

  1043. /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return

  1044.    (-1) if not available */

  1045. static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, 

  1046.                      const uint8_t *packet)

  1047. {

  1048.     int afc, len, flags;

  1049.     const uint8_t *p;

  1050.     unsigned int v;

  1051. 

  1052.     afc = (packet[3] >> 4) & 3;

  1053.     if (afc <= 1)

  1054.         return -1;

  1055.     p = packet + 4;

  1056.     len = p[0];

  1057.     p++;

  1058.     if (len == 0)

  1059.         return -1;

  1060.     flags = *p++;

  1061.     len--;

  1062.     if (!(flags & 0x10))

  1063.         return -1;

  1064.     if (len < 6)

  1065.         return -1;

  1066.     v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];

  1067.     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);

  1068.     *ppcr_low = ((p[4] & 1) << 8) | p[5];

  1069.     return 0;

  1070. }

  1071. 

  1072. static int mpegts_read_header(AVFormatContext *s,

  1073.                               AVFormatParameters *ap)

  1074. {

  1075.     MpegTSContext *ts = s->priv_data;

  1076.     ByteIOContext *pb = &s->pb;

  1077.     uint8_t buf[1024];

  1078.     int len, sid;

  1079.     int64_t pos;

  1080.     MpegTSService *service;

  1081.     

  1082.     if (ap) {

  1083.         ts->mpeg2ts_raw = ap->mpeg2ts_raw;

  1084.         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;

  1085.     }

  1086. 

  1087.     /* read the first 1024 bytes to get packet size */

  1088.     pos = url_ftell(pb);

  1089.     len = get_buffer(pb, buf, sizeof(buf));

  1090.     if (len != sizeof(buf))

  1091.         goto fail;

  1092.     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));

  1093.     if (ts->raw_packet_size <= 0)

  1094.         goto fail;

  1095.     ts->stream = s;

  1096.     ts->auto_guess = 0;

  1097. 

  1098.     if (!ts->mpeg2ts_raw) {

  1099.         /* normal demux */

  1100. 

  1101.         if (!ts->auto_guess) {

  1102.             ts->set_service_ret = -1;

  1103. 

  1104.             /* first do a scaning to get all the services */

  1105.             url_fseek(pb, pos, SEEK_SET);

  1106.             mpegts_scan_sdt(ts);

  1107.             

  1108.             handle_packets(ts, MAX_SCAN_PACKETS);

  1109.             

  1110.             if (ts->nb_services <= 0) {

  1111.                 /* no SDT found, we try to look at the PAT */

  1112.                 

  1113.                 /* First remove the SDT filters from each PID */

  1114.                 int i;

  1115.                 for (i=0; i < NB_PID_MAX; i++) {

  1116.                     if (ts->pids[i])

  1117.                         mpegts_close_filter(ts, ts->pids[i]);

  1118.                 }

  1119.                 url_fseek(pb, pos, SEEK_SET);

  1120.                 mpegts_scan_pat(ts);

  1121.                 

  1122.                 handle_packets(ts, MAX_SCAN_PACKETS);

  1123.             }

  1124.             

  1125.             if (ts->nb_services <= 0)

  1126.                 return -1;

  1127.             

  1128.             /* tune to first service found */

  1129.             service = ts->services[0];

  1130.             sid = service->sid;

  1131. #ifdef DEBUG_SI

  1132.             printf("tuning to '%s'\n", service->name);

  1133. #endif

  1134.             

  1135.             /* now find the info for the first service if we found any,

  1136.                otherwise try to filter all PATs */

  1137.             

  1138.             url_fseek(pb, pos, SEEK_SET);

  1139.             mpegts_set_service(ts, sid, set_service_cb, ts);

  1140.             

  1141.             handle_packets(ts, MAX_SCAN_PACKETS);

  1142.             

  1143.             /* if could not find service, exit */

  1144.             if (ts->set_service_ret != 0)

  1145.                 return -1;

  1146.             

  1147. #ifdef DEBUG_SI

  1148.             printf("tuning done\n");

  1149. #endif

  1150.         }

  1151.         s->ctx_flags |= AVFMTCTX_NOHEADER;

  1152.     } else {

  1153.         AVStream *st;

  1154.         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;

  1155.         int64_t pcrs[2], pcr_h;

  1156.         int packet_count[2];

  1157.         uint8_t packet[TS_PACKET_SIZE];

  1158.         

  1159.         /* only read packets */

  1160. 

  1161.         s->pts_num = 1;

  1162.         s->pts_den = 27000000;

  1163.         

  1164.         st = av_new_stream(s, 0);

  1165.         if (!st)

  1166.             goto fail;

  1167.         st->codec.codec_type = CODEC_TYPE_DATA;

  1168.         st->codec.codec_id = CODEC_ID_MPEG2TS;

  1169.         

  1170.         /* we iterate until we find two PCRs to estimate the bitrate */

  1171.         pcr_pid = -1;

  1172.         nb_pcrs = 0;

  1173.         nb_packets = 0;

  1174.         for(;;) {

  1175.             ret = read_packet(&s->pb, packet, ts->raw_packet_size);

  1176.             if (ret < 0)

  1177.                 return -1;

  1178.             pid = ((packet[1] & 0x1f) << 8) | packet[2];

  1179.             if ((pcr_pid == -1 || pcr_pid == pid) &&

  1180.                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {

  1181.                 pcr_pid = pid;

  1182.                 packet_count[nb_pcrs] = nb_packets;

  1183.                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;

  1184.                 nb_pcrs++;

  1185.                 if (nb_pcrs >= 2)

  1186.                     break;

  1187.             }

  1188.             nb_packets++;

  1189.         }

  1190.         ts->pcr_pid = pcr_pid;

  1191. 

  1192.         /* NOTE1: the bitrate is computed without the FEC */

  1193.         /* NOTE2: it is only the bitrate of the start of the stream */

  1194.         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);

  1195.         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];

  1196.         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;

  1197.         st->codec.bit_rate = s->bit_rate;

  1198.         st->start_time = ts->cur_pcr * 1000000.0 / 27.0e6;

  1199. #if 0

  1200.         printf("start=%0.3f pcr=%0.3f incr=%d\n",

  1201.                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);

  1202. #endif

  1203.     }

  1204. 

  1205.     url_fseek(pb, pos, SEEK_SET);

  1206.     return 0;

  1207.  fail:

  1208.     return -1;

  1209. }

  1210. 

  1211. #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)

  1212. 

  1213. static int mpegts_raw_read_packet(AVFormatContext *s,

  1214.                                   AVPacket *pkt)

  1215. {

  1216.     MpegTSContext *ts = s->priv_data;

  1217.     int ret, i;

  1218.     int64_t pcr_h, next_pcr_h, pos;

  1219.     int pcr_l, next_pcr_l;

  1220.     uint8_t pcr_buf[12];

  1221. 

  1222.     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)

  1223.         return -ENOMEM;

  1224.     ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);

  1225.     if (ret < 0) {

  1226.         av_free_packet(pkt);

  1227.         return ret;

  1228.     }

  1229.     if (ts->mpeg2ts_compute_pcr) {

  1230.         /* compute exact PCR for each packet */

  1231.         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {

  1232.             /* we read the next PCR (XXX: optimize it by using a bigger buffer */

  1233.             pos = url_ftell(&s->pb);

  1234.             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {

  1235.                 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);

  1236.                 get_buffer(&s->pb, pcr_buf, 12);

  1237.                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {

  1238.                     /* XXX: not precise enough */

  1239.                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) / 

  1240.                         (i + 1);

  1241.                     break;

  1242.                 }

  1243.             }

  1244.             url_fseek(&s->pb, pos, SEEK_SET);

  1245.             /* no next PCR found: we use previous increment */

  1246.             ts->cur_pcr = pcr_h * 300 + pcr_l;

  1247.         }

  1248.         pkt->pts = ts->cur_pcr;

  1249.         pkt->duration = ts->pcr_incr;

  1250.         ts->cur_pcr += ts->pcr_incr;

  1251.     }

  1252.     pkt->stream_index = 0;

  1253.     return 0;

  1254. }

  1255. 

  1256. static int mpegts_read_packet(AVFormatContext *s,

  1257.                               AVPacket *pkt)

  1258. {

  1259.     MpegTSContext *ts = s->priv_data;

  1260. 

  1261.     if (!ts->mpeg2ts_raw) {

  1262.         ts->pkt = pkt;

  1263.         return handle_packets(ts, 0);

  1264.     } else {

  1265.         return mpegts_raw_read_packet(s, pkt);

  1266.     }

  1267. }

  1268. 

  1269. static int mpegts_read_close(AVFormatContext *s)

  1270. {

  1271.     MpegTSContext *ts = s->priv_data;

  1272.     int i;

  1273.     for(i=0;i<NB_PID_MAX;i++)

  1274.         av_free(ts->pids[i]);

  1275.     return 0;

  1276. }

  1277. 

  1278. static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, 

  1279.                               int64_t *ppos, int find_next)

  1280. {

  1281.     MpegTSContext *ts = s->priv_data;

  1282.     int64_t pos, timestamp;

  1283.     uint8_t buf[TS_PACKET_SIZE];

  1284.     int pcr_l, pid;

  1285. 

  1286.     pos = *ppos;

  1287.     if (find_next) {

  1288.         for(;;) {

  1289.             url_fseek(&s->pb, pos, SEEK_SET);

  1290.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1291.                 return AV_NOPTS_VALUE;

  1292.             pid = ((buf[1] & 0x1f) << 8) | buf[2];

  1293.             if (pid == ts->pcr_pid &&

  1294.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1295.                 break;

  1296.             }

  1297.             pos += ts->raw_packet_size;

  1298.         }

  1299.     } else {

  1300.         for(;;) {

  1301.             pos -= ts->raw_packet_size;

  1302.             if (pos < 0)

  1303.                 return AV_NOPTS_VALUE;

  1304.             url_fseek(&s->pb, pos, SEEK_SET);

  1305.             if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)

  1306.                 return AV_NOPTS_VALUE;

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

  1308.             if (pid == ts->pcr_pid &&

  1309.                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {

  1310.                 break;

  1311.             }

  1312.         }

  1313.     }

  1314.     *ppos = pos;

  1315.     return timestamp;

  1316. }

  1317. 

  1318. typedef int64_t ReadTimestampFunc(AVFormatContext *s, int stream_index, 

  1319.                                   int64_t *ppos, int find_next);

  1320. 

  1321. static int64_t do_block_align(int64_t val, int block_align)

  1322. {

  1323.     return (val / block_align) * block_align;

  1324. }

  1325. 

  1326. /* XXX: use it in other formats */

  1327. static int timestamp_read_seek(AVFormatContext *s, 

  1328.                                int stream_index, int64_t timestamp,

  1329.                                ReadTimestampFunc *read_timestamp,

  1330.                                int block_align)

  1331. {

  1332.     int64_t pos_min, pos_max, pos;

  1333.     int64_t dts_min, dts_max, dts;

  1334. 

  1335. #ifdef DEBUG_SEEK

  1336.     printf("read_seek: %d %0.3f\n", stream_index, timestamp / 90000.0);

  1337. #endif

  1338. 

  1339.     pos_min = 0;

  1340.     dts_min = read_timestamp(s, stream_index, &pos_min, 1);

  1341.     if (dts_min == AV_NOPTS_VALUE) {

  1342.         /* we can reach this case only if no PTS are present in

  1343.            the whole stream */

  1344.         return -1;

  1345.     }

  1346.     pos_max = do_block_align(url_filesize(url_fileno(&s->pb)), block_align) - 

  1347.         block_align;

  1348.     dts_max = read_timestamp(s, stream_index, &pos_max, 0);

  1349.     

  1350.     while (pos_min <= pos_max) {

  1351. #ifdef DEBUG_SEEK

  1352.         printf("pos_min=0x%llx pos_max=0x%llx dts_min=%0.3f dts_max=%0.3f\n", 

  1353.                pos_min, pos_max,

  1354.                dts_min / 90000.0, dts_max / 90000.0);

  1355. #endif

  1356.         if (timestamp <= dts_min) {

  1357.             pos = pos_min;

  1358.             goto found;

  1359.         } else if (timestamp >= dts_max) {

  1360.             pos = pos_max;

  1361.             goto found;

  1362.         } else {

  1363.             /* interpolate position (better than dichotomy) */

  1364.             pos = (int64_t)((double)(pos_max - pos_min) * 

  1365.                             (double)(timestamp - dts_min) /

  1366.                             (double)(dts_max - dts_min)) + pos_min;

  1367.             pos = do_block_align(pos, block_align);

  1368.         }

  1369. #ifdef DEBUG_SEEK

  1370.         printf("pos=0x%llx\n", pos);

  1371. #endif

  1372.         /* read the next timestamp */

  1373.         dts = read_timestamp(s, stream_index, &pos, 1);

  1374.         /* check if we are lucky */

  1375.         if (dts == AV_NOPTS_VALUE) {

  1376.             /* should never happen */

  1377.             pos = pos_min;

  1378.             goto found;

  1379.         } else if (timestamp == dts) {

  1380.             goto found;

  1381.         } else if (timestamp < dts) {

  1382.             pos_max = pos;

  1383.             dts_max = read_timestamp(s, stream_index, &pos_max, 0);

  1384.             if (dts_max == AV_NOPTS_VALUE) {

  1385.                 /* should never happen */

  1386.                 break;

  1387.             } else if (timestamp >= dts_max) {

  1388.                 pos = pos_max;

  1389.                 goto found;

  1390.             }

  1391.         } else {

  1392.             pos_min = pos + block_align;

  1393.             dts_min = read_timestamp(s, stream_index, &pos_min, 1);

  1394.             if (dts_min == AV_NOPTS_VALUE) {

  1395.                 /* should never happen */

  1396.                 goto found;

  1397.             } else if (timestamp <= dts_min) {

  1398.                 goto found;

  1399.             }

  1400.         }

  1401.     }

  1402.     pos = pos_min;

  1403.  found:

  1404. #ifdef DEBUG_SEEK

  1405.     pos_min = pos;

  1406.     dts_min = read_timestamp(s, stream_index, &pos_min, 1);

  1407.     pos_min += block_align;

  1408.     dts_max = read_timestamp(s, stream_index, &pos_min, 1);

  1409.     printf("pos=0x%llx %0.3f<=%0.3f<=%0.3f\n", 

  1410.            pos, dts_min / 90000.0, timestamp / 90000.0, dts_max / 90000.0);

  1411. #endif

  1412.     /* do the seek */

  1413.     url_fseek(&s->pb, pos, SEEK_SET);

  1414.     return 0;

  1415. }

  1416. 

  1417. static int mpegts_read_seek(AVFormatContext *s, 

  1418.                             int stream_index, int64_t timestamp)

  1419. {

  1420.     MpegTSContext *ts = s->priv_data;

  1421. 

  1422.     timestamp = (timestamp * 90000) / AV_TIME_BASE;

  1423. 

  1424.     return timestamp_read_seek(s, stream_index, timestamp, 

  1425.                                mpegts_get_pcr, ts->raw_packet_size);

  1426. }

  1427. 

  1428. /**************************************************************/

  1429. /* parsing functions - called from other demuxers such as RTP */

  1430. 

  1431. MpegTSContext *mpegts_parse_open(AVFormatContext *s)

  1432. {

  1433.     MpegTSContext *ts;

  1434.     

  1435.     ts = av_mallocz(sizeof(MpegTSContext));

  1436.     if (!ts)

  1437.         return NULL;

  1438.     /* no stream case, currently used by RTP */

  1439.     ts->raw_packet_size = TS_PACKET_SIZE;

  1440.     ts->stream = s;

  1441.     ts->auto_guess = 1;

  1442.     return ts;

  1443. }

  1444. 

  1445. /* return the consumed length if a packet was output, or -1 if no

  1446.    packet is output */

  1447. int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,

  1448.                         const uint8_t *buf, int len)

  1449. {

  1450.     int len1;

  1451. 

  1452.     len1 = len;

  1453.     ts->pkt = pkt;

  1454.     ts->stop_parse = 0;

  1455.     for(;;) {

  1456.         if (ts->stop_parse)

  1457.             break;

  1458.         if (len < TS_PACKET_SIZE)

  1459.             return -1;

  1460.         if (buf[0] != 0x47) {

  1461.             buf--;

  1462.             len--;

  1463.         } else {

  1464.             handle_packet(ts, buf);

  1465.             buf += TS_PACKET_SIZE;

  1466.             len -= TS_PACKET_SIZE;

  1467.         }

  1468.     }

  1469.     return len1 - len;

  1470. }

  1471. 

  1472. void mpegts_parse_close(MpegTSContext *ts)

  1473. {

  1474.     int i;

  1475. 

  1476.     for(i=0;i<NB_PID_MAX;i++)

  1477.         av_free(ts->pids[i]);

  1478.     av_free(ts);

  1479. }

  1480. 

  1481. AVInputFormat mpegts_demux = {

  1482.     "mpegts",

  1483.     "MPEG2 transport stream format",

  1484.     sizeof(MpegTSContext),

  1485.     mpegts_probe,

  1486.     mpegts_read_header,

  1487.     mpegts_read_packet,

  1488.     mpegts_read_close,

  1489.     mpegts_read_seek,

  1490.     .flags = AVFMT_SHOW_IDS,

  1491. };

  1492. 

  1493. int mpegts_init(void)

  1494. {

  1495.     av_register_input_format(&mpegts_demux);

  1496. #ifdef CONFIG_ENCODERS

  1497.     av_register_output_format(&mpegts_mux);

  1498. #endif

  1499.     return 0;

  1500. }