modules/access_output/livehttp.c

   1 /*****************************************************************************
   2  * livehttp.c: Live HTTP Streaming
   3  *****************************************************************************
   4  * Copyright © 2001, 2002, 2013 VLC authors and VideoLAN
   5  * Copyright © 2009-2010 by Keary Griffin
   6  *
   7  * Authors: Keary Griffin <kearygriffin at gmail.com>
   8  *          Ilkka Ollakka <ileoo at videolan dot org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <sys/types.h>
  34 #include <time.h>
  35 #include <fcntl.h>
  36 #include <errno.h>
  37 #include <unistd.h>
  38
  39 #include <vlc_common.h>
  40 #include <vlc_plugin.h>
  41 #include <vlc_sout.h>
  42 #include <vlc_block.h>
  43 #include <vlc_fs.h>
  44 #include <vlc_strings.h>
  45 #include <vlc_charset.h>
  46
  47 #include <gcrypt.h>
  48 #include <vlc_gcrypt.h>
  49
  50 #include <vlc_rand.h>
  51
  52 #ifndef O_LARGEFILE
  53 #   define O_LARGEFILE 0
  54 #endif
  55
  56 #define STR_ENDLIST "#EXT-X-ENDLIST\n"
  57
  58 #define MAX_RENAME_RETRIES        10
  59
  60 /*****************************************************************************
  61  * Module descriptor
  62  *****************************************************************************/
  63 static int  Open ( vlc_object_t * );
  64 static void Close( vlc_object_t * );
  65
  66 #define SOUT_CFG_PREFIX "sout-livehttp-"
  67 #define SEGLEN_TEXT N_("Segment length")
  68 #define SEGLEN_LONGTEXT N_("Length of TS stream segments")
  69
  70 #define SPLITANYWHERE_TEXT N_("Split segments anywhere")
  71 #define SPLITANYWHERE_LONGTEXT N_("Don't require a keyframe before splitting "\
  72                                 "a segment. Needed for audio only.")
  73
  74 #define NUMSEGS_TEXT N_("Number of segments")
  75 #define NUMSEGS_LONGTEXT N_("Number of segments to include in index")
  76
  77 #define NOCACHE_TEXT N_("Allow cache")
  78 #define NOCACHE_LONGTEXT N_("Add EXT-X-ALLOW-CACHE:NO directive in playlist-file if this is disabled")
  79
  80 #define INDEX_TEXT N_("Index file")
  81 #define INDEX_LONGTEXT N_("Path to the index file to create")
  82
  83 #define INDEXURL_TEXT N_("Full URL to put in index file")
  84 #define INDEXURL_LONGTEXT N_("Full URL to put in index file. "\
  85                           "Use #'s to represent segment number")
  86
  87 #define DELSEGS_TEXT N_("Delete segments")
  88 #define DELSEGS_LONGTEXT N_("Delete segments when they are no longer needed")
  89
  90 #define RATECONTROL_TEXT N_("Use muxers rate control mechanism")
  91
  92 #define KEYURI_TEXT N_("AES key URI to place in playlist")
  93
  94 #define KEYFILE_TEXT N_("AES key file")
  95 #define KEYFILE_LONGTEXT N_("File containing the 16 bytes encryption key")
  96
  97 #define KEYLOADFILE_TEXT N_("File where vlc reads key-uri and keyfile-location")
  98 #define KEYLOADFILE_LONGTEXT N_("File is read when segment starts and is assumed to be in format: "\
  99                                 "key-uri\\nkey-file. File is read on the segment opening and "\
 100                                 "values are used on that segment.")
 101
 102 #define RANDOMIV_TEXT N_("Use randomized IV for encryption")
 103 #define RANDOMIV_LONGTEXT N_("Generate IV instead using segment-number as IV")
 104
 105 #define INTITIAL_SEG_TEXT N_("Number of first segment")
 106 #define INITIAL_SEG_LONGTEXT N_("The number of the first segment generated")
 107
 108 vlc_module_begin ()
 109     set_description( N_("HTTP Live streaming output") )
 110     set_shortname( N_("LiveHTTP" ))
 111     add_shortcut( "livehttp" )
 112     set_capability( "sout access", 0 )
 113     set_category( CAT_SOUT )
 114     set_subcategory( SUBCAT_SOUT_ACO )
 115     add_integer( SOUT_CFG_PREFIX "seglen", 10, SEGLEN_TEXT, SEGLEN_LONGTEXT, false )
 116     add_integer( SOUT_CFG_PREFIX "numsegs", 0, NUMSEGS_TEXT, NUMSEGS_LONGTEXT, false )
 117     add_integer( SOUT_CFG_PREFIX "initial-segment-number", 1, INTITIAL_SEG_TEXT, INITIAL_SEG_LONGTEXT, false )
 118     add_bool( SOUT_CFG_PREFIX "splitanywhere", false,
 119               SPLITANYWHERE_TEXT, SPLITANYWHERE_LONGTEXT, true )
 120     add_bool( SOUT_CFG_PREFIX "delsegs", true,
 121               DELSEGS_TEXT, DELSEGS_LONGTEXT, true )
 122     add_bool( SOUT_CFG_PREFIX "ratecontrol", false,
 123               RATECONTROL_TEXT, RATECONTROL_TEXT, true )
 124     add_bool( SOUT_CFG_PREFIX "caching", false,
 125               NOCACHE_TEXT, NOCACHE_LONGTEXT, true )
 126     add_bool( SOUT_CFG_PREFIX "generate-iv", false,
 127               RANDOMIV_TEXT, RANDOMIV_LONGTEXT, true )
 128     add_string( SOUT_CFG_PREFIX "index", NULL,
 129                 INDEX_TEXT, INDEX_LONGTEXT, false )
 130     add_string( SOUT_CFG_PREFIX "index-url", NULL,
 131                 INDEXURL_TEXT, INDEXURL_LONGTEXT, false )
 132     add_string( SOUT_CFG_PREFIX "key-uri", NULL,
 133                 KEYURI_TEXT, KEYURI_TEXT, true )
 134     add_loadfile( SOUT_CFG_PREFIX "key-file", NULL,
 135                 KEYFILE_TEXT, KEYFILE_LONGTEXT, true )
 136     add_loadfile( SOUT_CFG_PREFIX "key-loadfile", NULL,
 137                 KEYLOADFILE_TEXT, KEYLOADFILE_LONGTEXT, true )
 138     set_callbacks( Open, Close )
 139 vlc_module_end ()
 140
 141
 142 /*****************************************************************************
 143  * Exported prototypes
 144  *****************************************************************************/
 145 static const char *const ppsz_sout_options[] = {
 146     "seglen",
 147     "splitanywhere",
 148     "numsegs",
 149     "delsegs",
 150     "index",
 151     "index-url",
 152     "ratecontrol",
 153     "caching",
 154     "key-uri",
 155     "key-file",
 156     "key-loadfile",
 157     "generate-iv",
 158     "initial-segment-number",
 159     NULL
 160 };
 161
 162 static ssize_t Write( sout_access_out_t *, block_t * );
 163 static int Control( sout_access_out_t *, int, va_list );
 164
 165 typedef struct output_segment
 166 {
 167     char *psz_filename;
 168     char *psz_uri;
 169     char *psz_key_uri;
 170     char *psz_duration;
 171     float f_seglength;
 172     uint32_t i_segment_number;
 173     uint8_t aes_ivs[16];
 174 } output_segment_t;
 175
 176 struct sout_access_out_sys_t
 177 {
 178     char *psz_cursegPath;
 179     char *psz_indexPath;
 180     char *psz_indexUrl;
 181     char *psz_keyfile;
 182     mtime_t i_keyfile_modification;
 183     mtime_t i_opendts;
 184     mtime_t i_dts_offset;
 185     mtime_t  i_seglenm;
 186     uint32_t i_segment;
 187     size_t  i_seglen;
 188     float   f_seglen;
 189     block_t *full_segments;
 190     block_t **full_segments_end;
 191     block_t *ongoing_segment;
 192     block_t **ongoing_segment_end;
 193     int i_handle;
 194     unsigned i_numsegs;
 195     unsigned i_initial_segment;
 196     bool b_delsegs;
 197     bool b_ratecontrol;
 198     bool b_splitanywhere;
 199     bool b_caching;
 200     bool b_generate_iv;
 201     bool b_segment_has_data;
 202     uint8_t aes_ivs[16];
 203     gcry_cipher_hd_t aes_ctx;
 204     char *key_uri;
 205     uint8_t stuffing_bytes[16];
 206     ssize_t stuffing_size;
 207     vlc_array_t segments_t;
 208 };
 209
 210 static int LoadCryptFile( sout_access_out_t *p_access);
 211 static int CryptSetup( sout_access_out_t *p_access, char *keyfile );
 212 static int CheckSegmentChange( sout_access_out_t *p_access, block_t *p_buffer );
 213 static ssize_t writeSegment( sout_access_out_t *p_access );
 214 static ssize_t openNextFile( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys );
 215 /*****************************************************************************
 216  * Open: open the file
 217  *****************************************************************************/
 218 static int Open( vlc_object_t *p_this )
 219 {
 220     sout_access_out_t   *p_access = (sout_access_out_t*)p_this;
 221     sout_access_out_sys_t *p_sys;
 222     char *psz_idx;
 223
 224     config_ChainParse( p_access, SOUT_CFG_PREFIX, ppsz_sout_options, p_access->p_cfg );
 225
 226     if( !p_access->psz_path )
 227     {
 228         msg_Err( p_access, "no file name specified" );
 229         return VLC_EGENERIC;
 230     }
 231
 232     if( unlikely( !( p_sys = calloc ( 1, sizeof( *p_sys ) ) ) ) )
 233         return VLC_ENOMEM;
 234
 235     /* Try to get within asked segment length */
 236     p_sys->i_seglen = var_GetInteger( p_access, SOUT_CFG_PREFIX "seglen" );
 237
 238     p_sys->i_seglenm = CLOCK_FREQ * p_sys->i_seglen;
 239     p_sys->full_segments = NULL;
 240     p_sys->full_segments_end = &p_sys->full_segments;
 241
 242     p_sys->ongoing_segment = NULL;
 243     p_sys->ongoing_segment_end = &p_sys->ongoing_segment;
 244
 245     p_sys->i_numsegs = var_GetInteger( p_access, SOUT_CFG_PREFIX "numsegs" );
 246     p_sys->i_initial_segment = var_GetInteger( p_access, SOUT_CFG_PREFIX "initial-segment-number" );
 247     p_sys->b_splitanywhere = var_GetBool( p_access, SOUT_CFG_PREFIX "splitanywhere" );
 248     p_sys->b_delsegs = var_GetBool( p_access, SOUT_CFG_PREFIX "delsegs" );
 249     p_sys->b_ratecontrol = var_GetBool( p_access, SOUT_CFG_PREFIX "ratecontrol") ;
 250     p_sys->b_caching = var_GetBool( p_access, SOUT_CFG_PREFIX "caching") ;
 251     p_sys->b_generate_iv = var_GetBool( p_access, SOUT_CFG_PREFIX "generate-iv") ;
 252     p_sys->b_segment_has_data = false;
 253
 254     vlc_array_init( &p_sys->segments_t );
 255
 256     p_sys->stuffing_size = 0;
 257     p_sys->i_opendts = VLC_TS_INVALID;
 258     p_sys->i_dts_offset  = 0;
 259
 260     p_sys->psz_indexPath = NULL;
 261     psz_idx = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "index" );
 262     if ( psz_idx )
 263     {
 264         char *psz_tmp;
 265         psz_tmp = vlc_strftime( psz_idx );
 266         free( psz_idx );
 267         if ( !psz_tmp )
 268         {
 269             free( p_sys );
 270             return VLC_ENOMEM;
 271         }
 272         p_sys->psz_indexPath = psz_tmp;
 273         if( p_sys->i_initial_segment != 1 )
 274             vlc_unlink( p_sys->psz_indexPath );
 275     }
 276
 277     p_sys->psz_indexUrl = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "index-url" );
 278     p_sys->psz_keyfile  = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "key-loadfile" );
 279     p_sys->key_uri      = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "key-uri" );
 280
 281     p_access->p_sys = p_sys;
 282
 283     if( p_sys->psz_keyfile && ( LoadCryptFile( p_access ) < 0 ) )
 284     {
 285         free( p_sys->psz_indexUrl );
 286         free( p_sys->psz_indexPath );
 287         free( p_sys );
 288         msg_Err( p_access, "Encryption init failed" );
 289         return VLC_EGENERIC;
 290     }
 291     else if( !p_sys->psz_keyfile && ( CryptSetup( p_access, NULL ) < 0 ) )
 292     {
 293         free( p_sys->psz_indexUrl );
 294         free( p_sys->psz_indexPath );
 295         free( p_sys );
 296         msg_Err( p_access, "Encryption init failed" );
 297         return VLC_EGENERIC;
 298     }
 299
 300     p_sys->i_handle = -1;
 301     p_sys->i_segment = p_sys->i_initial_segment-1;
 302     p_sys->psz_cursegPath = NULL;
 303
 304     p_access->pf_write = Write;
 305     p_access->pf_control = Control;
 306
 307     return VLC_SUCCESS;
 308 }
 309
 310 /************************************************************************
 311  * CryptSetup: Initialize encryption
 312  ************************************************************************/
 313 static int CryptSetup( sout_access_out_t *p_access, char *key_file )
 314 {
 315     sout_access_out_sys_t *p_sys = p_access->p_sys;
 316     uint8_t key[16];
 317     char *keyfile = NULL;
 318
 319     if( !p_sys->key_uri ) /*No key uri, assume no encryption wanted*/
 320     {
 321         msg_Dbg( p_access, "No key uri, no encryption");
 322         return VLC_SUCCESS;
 323     }
 324
 325     if( key_file )
 326         keyfile = strdup( key_file );
 327     else
 328         keyfile = var_InheritString( p_access, SOUT_CFG_PREFIX "key-file" );
 329
 330     if( unlikely(keyfile == NULL) )
 331     {
 332         msg_Err( p_access, "No key-file, no encryption" );
 333         return VLC_EGENERIC;
 334     }
 335
 336     vlc_gcrypt_init();
 337
 338     /*Setup encryption cipher*/
 339     gcry_error_t err = gcry_cipher_open( &p_sys->aes_ctx, GCRY_CIPHER_AES,
 340                                          GCRY_CIPHER_MODE_CBC, 0 );
 341     if( err )
 342     {
 343         msg_Err( p_access, "Openin AES Cipher failed: %s", gpg_strerror(err));
 344         free( keyfile );
 345         return VLC_EGENERIC;
 346     }
 347
 348     int keyfd = vlc_open( keyfile, O_RDONLY | O_NONBLOCK );
 349     if( unlikely( keyfd == -1 ) )
 350     {
 351         msg_Err( p_access, "Unable to open keyfile %s: %s", keyfile,
 352                  vlc_strerror_c(errno) );
 353         free( keyfile );
 354         gcry_cipher_close( p_sys->aes_ctx );
 355         return VLC_EGENERIC;
 356     }
 357     free( keyfile );
 358
 359     ssize_t keylen = read( keyfd, key, 16 );
 360
 361     vlc_close( keyfd );
 362     if( keylen < 16 )
 363     {
 364         msg_Err( p_access, "No key at least 16 octects (you provided %zd), no encryption", keylen );
 365         gcry_cipher_close( p_sys->aes_ctx );
 366         return VLC_EGENERIC;
 367     }
 368
 369     err = gcry_cipher_setkey( p_sys->aes_ctx, key, 16 );
 370     if(err)
 371     {
 372         msg_Err(p_access, "Setting AES key failed: %s", gpg_strerror(err));
 373         gcry_cipher_close( p_sys->aes_ctx );
 374         return VLC_EGENERIC;
 375     }
 376
 377     if( p_sys->b_generate_iv )
 378         vlc_rand_bytes( p_sys->aes_ivs, sizeof(uint8_t)*16);
 379
 380     return VLC_SUCCESS;
 381 }
 382
 383
 384 /************************************************************************
 385  * LoadCryptFile: Try to parse key_uri and keyfile-location from file
 386  ************************************************************************/
 387 static int LoadCryptFile( sout_access_out_t *p_access )
 388 {
 389     sout_access_out_sys_t *p_sys = p_access->p_sys;
 390
 391     FILE *stream = vlc_fopen( p_sys->psz_keyfile, "rt" );
 392     char *key_file=NULL,*key_uri=NULL;
 393
 394     if( unlikely( stream == NULL ) )
 395     {
 396         msg_Err( p_access, "Unable to open keyloadfile %s: %s",
 397                  p_sys->psz_keyfile, vlc_strerror_c(errno) );
 398         return VLC_EGENERIC;
 399     }
 400
 401
 402     //First read key_uri
 403     ssize_t len = getline( &key_uri, &(size_t){0}, stream );
 404     if( unlikely( len == -1 ) )
 405     {
 406         msg_Err( p_access, "Cannot read %s: %s", p_sys->psz_keyfile,
 407                  vlc_strerror_c(errno) );
 408         clearerr( stream );
 409         fclose( stream );
 410         free( key_uri );
 411         return VLC_EGENERIC;
 412     }
 413     //Strip the newline from uri, maybe scanf would be better?
 414     key_uri[len-1]='\0';
 415
 416     len = getline( &key_file, &(size_t){0}, stream );
 417     if( unlikely( len == -1 ) )
 418     {
 419         msg_Err( p_access, "Cannot read %s: %s", p_sys->psz_keyfile,
 420                  vlc_strerror_c(errno) );
 421         clearerr( stream );
 422         fclose( stream );
 423
 424         free( key_uri );
 425         free( key_file );
 426         return VLC_EGENERIC;
 427     }
 428     // Strip the last newline from filename
 429     key_file[len-1]='\0';
 430     fclose( stream );
 431
 432     int returncode = VLC_SUCCESS;
 433     if( !p_sys->key_uri || strcmp( p_sys->key_uri, key_uri ) )
 434     {
 435         if( p_sys->key_uri )
 436         {
 437             free( p_sys->key_uri );
 438             p_sys->key_uri = NULL;
 439         }
 440         p_sys->key_uri = strdup( key_uri );
 441         returncode = CryptSetup( p_access, key_file );
 442     }
 443     free( key_file );
 444     free( key_uri );
 445     return returncode;
 446 }
 447
 448 /************************************************************************
 449  * CryptKey: Set encryption IV to current segment number
 450  ************************************************************************/
 451 static int CryptKey( sout_access_out_t *p_access, uint32_t i_segment )
 452 {
 453     sout_access_out_sys_t *p_sys = p_access->p_sys;
 454
 455     if( !p_sys->b_generate_iv )
 456     {
 457         /* Use segment number as IV if randomIV isn't selected*/
 458         memset( p_sys->aes_ivs, 0, 16 * sizeof(uint8_t));
 459         p_sys->aes_ivs[15] = i_segment & 0xff;
 460         p_sys->aes_ivs[14] = (i_segment >> 8 ) & 0xff;
 461         p_sys->aes_ivs[13] = (i_segment >> 16 ) & 0xff;
 462         p_sys->aes_ivs[12] = (i_segment >> 24 ) & 0xff;
 463     }
 464
 465     gcry_error_t err = gcry_cipher_setiv( p_sys->aes_ctx,
 466                                           p_sys->aes_ivs, 16);
 467     if( err )
 468     {
 469         msg_Err(p_access, "Setting AES IVs failed: %s", gpg_strerror(err) );
 470         gcry_cipher_close( p_sys->aes_ctx);
 471         return VLC_EGENERIC;
 472     }
 473     return VLC_SUCCESS;
 474 }
 475
 476
 477 #define SEG_NUMBER_PLACEHOLDER "#"
 478 /*****************************************************************************
 479  * formatSegmentPath: create segment path name based on seg #
 480  *****************************************************************************/
 481 static char *formatSegmentPath( char *psz_path, uint32_t i_seg )
 482 {
 483     char *psz_result;
 484     char *psz_firstNumSign;
 485
 486     if ( ! ( psz_result  = vlc_strftime( psz_path ) ) )
 487         return NULL;
 488
 489     psz_firstNumSign = psz_result + strcspn( psz_result, SEG_NUMBER_PLACEHOLDER );
 490     if ( *psz_firstNumSign )
 491     {
 492         char *psz_newResult;
 493         int i_cnt = strspn( psz_firstNumSign, SEG_NUMBER_PLACEHOLDER );
 494         int ret;
 495
 496         *psz_firstNumSign = '\0';
 497         ret = asprintf( &psz_newResult, "%s%0*d%s", psz_result, i_cnt, i_seg, psz_firstNumSign + i_cnt );
 498         free ( psz_result );
 499         if ( ret < 0 )
 500             return NULL;
 501         psz_result = psz_newResult;
 502     }
 503
 504     return psz_result;
 505 }
 506
 507 static void destroySegment( output_segment_t *segment )
 508 {
 509     free( segment->psz_filename );
 510     free( segment->psz_duration );
 511     free( segment->psz_uri );
 512     free( segment->psz_key_uri );
 513     free( segment );
 514 }
 515
 516 /************************************************************************
 517  * segmentAmountNeeded: check that playlist has atleast 3*p_sys->i_seglength of segments
 518  * return how many segments are needed for that (max of p_sys->i_segment )
 519  ************************************************************************/
 520 static uint32_t segmentAmountNeeded( sout_access_out_sys_t *p_sys )
 521 {
 522     float duration = .0f;
 523     for( size_t index = 1; index <= vlc_array_count( &p_sys->segments_t ); index++ )
 524     {
 525         output_segment_t* segment = vlc_array_item_at_index( &p_sys->segments_t, vlc_array_count( &p_sys->segments_t ) - index );
 526         duration += segment->f_seglength;
 527
 528         if( duration >= (float)( 3 * p_sys->i_seglen ) )
 529             return __MAX(index, p_sys->i_numsegs);
 530     }
 531     return vlc_array_count( &p_sys->segments_t ) - 1;
 532
 533 }
 534
 535
 536 /************************************************************************
 537  * isFirstItemRemovable: Check for draft 11 section 6.2.2
 538  * check that the first item has been around outside playlist
 539  * segment->f_seglength + (p_sys->i_numsegs * p_sys->i_seglen) before it is removed.
 540  ************************************************************************/
 541 static bool isFirstItemRemovable( sout_access_out_sys_t *p_sys, uint32_t i_firstseg, uint32_t i_index_offset )
 542 {
 543     float duration = .0f;
 544
 545     /* Check that segment has been out of playlist for seglength + (p_sys->i_numsegs * p_sys->i_seglen) amount
 546      * We check this by calculating duration of the items that replaced first item in playlist
 547      */
 548     for( unsigned int index = 0; index < i_index_offset; index++ )
 549     {
 550         output_segment_t *segment = vlc_array_item_at_index( &p_sys->segments_t, p_sys->i_segment - i_firstseg + index );
 551         duration += segment->f_seglength;
 552     }
 553     output_segment_t *first = vlc_array_item_at_index( &p_sys->segments_t, 0 );
 554
 555     return duration >= (first->f_seglength + (float)(p_sys->i_numsegs * p_sys->i_seglen));
 556 }
 557
 558 /************************************************************************
 559  * updateIndexAndDel: If necessary, update index file & delete old segments
 560  ************************************************************************/
 561 static int updateIndexAndDel( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys, bool b_isend )
 562 {
 563
 564     uint32_t i_firstseg;
 565     unsigned i_index_offset = 0;
 566
 567     if ( p_sys->i_numsegs == 0 ||
 568          p_sys->i_segment < ( p_sys->i_numsegs + p_sys->i_initial_segment ) )
 569     {
 570         i_firstseg = p_sys->i_initial_segment;
 571     }
 572     else
 573     {
 574         unsigned numsegs = segmentAmountNeeded( p_sys );
 575         i_firstseg = ( p_sys->i_segment - numsegs ) + 1;
 576         i_index_offset = vlc_array_count( &p_sys->segments_t ) - numsegs;
 577     }
 578
 579     // First update index
 580     if ( p_sys->psz_indexPath )
 581     {
 582         int val;
 583         FILE *fp;
 584         char *psz_idxTmp;
 585         if ( asprintf( &psz_idxTmp, "%s.tmp", p_sys->psz_indexPath ) < 0)
 586             return -1;
 587
 588         fp = vlc_fopen( psz_idxTmp, "wt");
 589         if ( !fp )
 590         {
 591             msg_Err( p_access, "cannot open index file `%s'", psz_idxTmp );
 592             free( psz_idxTmp );
 593             return -1;
 594         }
 595
 596         if ( fprintf( fp, "#EXTM3U\n#EXT-X-TARGETDURATION:%zu\n#EXT-X-VERSION:3\n#EXT-X-ALLOW-CACHE:%s"
 597                           "%s\n#EXT-X-MEDIA-SEQUENCE:%"PRIu32"\n%s", p_sys->i_seglen,
 598                           p_sys->b_caching ? "YES" : "NO",
 599                           p_sys->i_numsegs > 0 ? "" : b_isend ? "\n#EXT-X-PLAYLIST-TYPE:VOD" : "\n#EXT-X-PLAYLIST-TYPE:EVENT",
 600                           i_firstseg, ((p_sys->i_initial_segment > 1) && (p_sys->i_initial_segment == i_firstseg)) ? "#EXT-X-DISCONTINUITY\n" : ""
 601                           ) < 0 )
 602         {
 603             free( psz_idxTmp );
 604             fclose( fp );
 605             return -1;
 606         }
 607         char *psz_current_uri=NULL;
 608
 609
 610         for ( uint32_t i = i_firstseg; i <= p_sys->i_segment; i++ )
 611         {
 612             //scale to i_index_offset..numsegs + i_index_offset
 613             uint32_t index = i - i_firstseg + i_index_offset;
 614
 615             output_segment_t *segment = vlc_array_item_at_index( &p_sys->segments_t, index );
 616             if( p_sys->key_uri &&
 617                 ( !psz_current_uri ||  strcmp( psz_current_uri, segment->psz_key_uri ) )
 618               )
 619             {
 620                 int ret = 0;
 621                 free( psz_current_uri );
 622                 psz_current_uri = strdup( segment->psz_key_uri );
 623                 if( p_sys->b_generate_iv )
 624                 {
 625                     unsigned long long iv_hi = segment->aes_ivs[0];
 626                     unsigned long long iv_lo = segment->aes_ivs[8];
 627                     for( unsigned short j = 1; j < 8; j++ )
 628                     {
 629                         iv_hi <<= 8;
 630                         iv_hi |= segment->aes_ivs[j] & 0xff;
 631                         iv_lo <<= 8;
 632                         iv_lo |= segment->aes_ivs[8+j] & 0xff;
 633                     }
 634                     ret = fprintf( fp, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\",IV=0X%16.16llx%16.16llx\n",
 635                                    segment->psz_key_uri, iv_hi, iv_lo );
 636
 637                 } else {
 638                     ret = fprintf( fp, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"\n", segment->psz_key_uri );
 639                 }
 640                 if( ret < 0 )
 641                 {
 642                     free( psz_current_uri );
 643                     free( psz_idxTmp );
 644                     fclose( fp );
 645                     return -1;
 646                 }
 647             }
 648
 649             val = fprintf( fp, "#EXTINF:%s,\n%s\n", segment->psz_duration, segment->psz_uri);
 650             if ( val < 0 )
 651             {
 652                 free( psz_current_uri );
 653                 free( psz_idxTmp );
 654                 fclose( fp );
 655                 return -1;
 656             }
 657         }
 658         free( psz_current_uri );
 659
 660         if ( b_isend )
 661         {
 662             if ( fputs ( STR_ENDLIST, fp ) < 0)
 663             {
 664                 free( psz_idxTmp );
 665                 fclose( fp ) ;
 666                 return -1;
 667             }
 668
 669         }
 670         fclose( fp );
 671
 672         val = vlc_rename ( psz_idxTmp, p_sys->psz_indexPath);
 673
 674         if ( val < 0 )
 675         {
 676             vlc_unlink( psz_idxTmp );
 677             msg_Err( p_access, "Error moving LiveHttp index file" );
 678         }
 679         else
 680             msg_Dbg( p_access, "LiveHttpIndexComplete: %s" , p_sys->psz_indexPath );
 681
 682         free( psz_idxTmp );
 683     }
 684
 685     // Then take care of deletion
 686     // Try to follow pantos draft 11 section 6.2.2
 687     while( p_sys->b_delsegs && p_sys->i_numsegs &&
 688            isFirstItemRemovable( p_sys, i_firstseg, i_index_offset )
 689          )
 690     {
 691          output_segment_t *segment = vlc_array_item_at_index( &p_sys->segments_t, 0 );
 692          msg_Dbg( p_access, "Removing segment number %d", segment->i_segment_number );
 693          vlc_array_remove( &p_sys->segments_t, 0 );
 694
 695          if ( segment->psz_filename )
 696          {
 697              vlc_unlink( segment->psz_filename );
 698          }
 699
 700          destroySegment( segment );
 701          i_index_offset -=1;
 702     }
 703
 704
 705     return 0;
 706 }
 707
 708 /*****************************************************************************
 709  * closeCurrentSegment: Close the segment file
 710  *****************************************************************************/
 711 static void closeCurrentSegment( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys, bool b_isend )
 712 {
 713     if ( p_sys->i_handle >= 0 )
 714     {
 715         output_segment_t *segment = vlc_array_item_at_index( &p_sys->segments_t, vlc_array_count( &p_sys->segments_t ) - 1 );
 716
 717         if( p_sys->key_uri )
 718         {
 719             size_t pad = 16 - p_sys->stuffing_size;
 720             memset(&p_sys->stuffing_bytes[p_sys->stuffing_size], pad, pad);
 721             gcry_error_t err = gcry_cipher_encrypt( p_sys->aes_ctx, p_sys->stuffing_bytes, 16, NULL, 0 );
 722
 723             if( err ) {
 724                msg_Err( p_access, "Couldn't encrypt 16 bytes: %s", gpg_strerror(err) );
 725             } else {
 726
 727             int ret = vlc_write( p_sys->i_handle, p_sys->stuffing_bytes, 16 );
 728             if( ret != 16 )
 729                 msg_Err( p_access, "Couldn't write 16 bytes" );
 730             }
 731             p_sys->stuffing_size = 0;
 732         }
 733
 734
 735         vlc_close( p_sys->i_handle );
 736         p_sys->i_handle = -1;
 737
 738         if( ! ( us_asprintf( &segment->psz_duration, "%.2f", p_sys->f_seglen ) ) )
 739         {
 740             msg_Err( p_access, "Couldn't set duration on closed segment");
 741             return;
 742         }
 743         segment->f_seglength = p_sys->f_seglen;
 744
 745         segment->i_segment_number = p_sys->i_segment;
 746
 747         if ( p_sys->psz_cursegPath )
 748         {
 749             msg_Dbg( p_access, "LiveHttpSegmentComplete: %s (%"PRIu32")" , p_sys->psz_cursegPath, p_sys->i_segment );
 750             free( p_sys->psz_cursegPath );
 751             p_sys->psz_cursegPath = 0;
 752             updateIndexAndDel( p_access, p_sys, b_isend );
 753         }
 754     }
 755 }
 756
 757 /*****************************************************************************
 758  * Close: close the target
 759  *****************************************************************************/
 760 static void Close( vlc_object_t * p_this )
 761 {
 762     sout_access_out_t *p_access = (sout_access_out_t*)p_this;
 763     sout_access_out_sys_t *p_sys = p_access->p_sys;
 764
 765     if( p_sys->ongoing_segment )
 766         block_ChainLastAppend( &p_sys->full_segments_end, p_sys->ongoing_segment );
 767     p_sys->ongoing_segment = NULL;
 768     p_sys->ongoing_segment_end = &p_sys->ongoing_segment;
 769
 770     block_t *output_block = p_sys->full_segments;
 771     p_sys->full_segments = NULL;
 772     p_sys->full_segments_end = &p_sys->full_segments;
 773
 774     while( output_block )
 775     {
 776         block_t *p_next = output_block->p_next;
 777         output_block->p_next = NULL;
 778
 779         Write( p_access, output_block );
 780         output_block = p_next;
 781     }
 782     if( p_sys->ongoing_segment )
 783     {
 784         block_ChainLastAppend( &p_sys->full_segments_end, p_sys->ongoing_segment );
 785         p_sys->ongoing_segment = NULL;
 786         p_sys->ongoing_segment_end = &p_sys->ongoing_segment;
 787     }
 788
 789     ssize_t writevalue = writeSegment( p_access );
 790     msg_Dbg( p_access, "Writing.. %zd", writevalue );
 791     if( unlikely( writevalue < 0 ) )
 792     {
 793         if( p_sys->full_segments )
 794             block_ChainRelease( p_sys->full_segments );
 795         if( p_sys->ongoing_segment )
 796             block_ChainRelease( p_sys->ongoing_segment );
 797     }
 798
 799     closeCurrentSegment( p_access, p_sys, true );
 800
 801     if( p_sys->key_uri )
 802     {
 803         gcry_cipher_close( p_sys->aes_ctx );
 804         free( p_sys->key_uri );
 805     }
 806
 807     while( vlc_array_count( &p_sys->segments_t ) > 0 )
 808     {
 809         output_segment_t *segment = vlc_array_item_at_index( &p_sys->segments_t, 0 );
 810         vlc_array_remove( &p_sys->segments_t, 0 );
 811         if( p_sys->b_delsegs && p_sys->i_numsegs && segment->psz_filename )
 812         {
 813             msg_Dbg( p_access, "Removing segment number %d name %s", segment->i_segment_number, segment->psz_filename );
 814             vlc_unlink( segment->psz_filename );
 815         }
 816
 817         destroySegment( segment );
 818     }
 819
 820     free( p_sys->psz_indexUrl );
 821     free( p_sys->psz_indexPath );
 822     free( p_sys );
 823
 824     msg_Dbg( p_access, "livehttp access output closed" );
 825 }
 826
 827 static int Control( sout_access_out_t *p_access, int i_query, va_list args )
 828 {
 829     sout_access_out_sys_t *p_sys = p_access->p_sys;
 830
 831     switch( i_query )
 832     {
 833         case ACCESS_OUT_CONTROLS_PACE:
 834         {
 835             bool *pb = va_arg( args, bool * );
 836             *pb = !p_sys->b_ratecontrol;
 837             //*pb = true;
 838             break;
 839         }
 840
 841         default:
 842             return VLC_EGENERIC;
 843     }
 844     return VLC_SUCCESS;
 845 }
 846
 847 /*****************************************************************************
 848  * openNextFile: Open the segment file
 849  *****************************************************************************/
 850 static ssize_t openNextFile( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys )
 851 {
 852     int fd;
 853
 854     uint32_t i_newseg = p_sys->i_segment + 1;
 855
 856     /* Create segment and fill it info that we can (everything excluding duration */
 857     output_segment_t *segment = (output_segment_t*)calloc(1, sizeof(output_segment_t));
 858     if( unlikely( !segment ) )
 859         return -1;
 860
 861     segment->i_segment_number = i_newseg;
 862     segment->psz_filename = formatSegmentPath( p_access->psz_path, i_newseg );
 863     char *psz_idxFormat = p_sys->psz_indexUrl ? p_sys->psz_indexUrl : p_access->psz_path;
 864     segment->psz_uri = formatSegmentPath( psz_idxFormat , i_newseg );
 865
 866     if ( unlikely( !segment->psz_filename ) )
 867     {
 868         msg_Err( p_access, "Format segmentpath failed");
 869         destroySegment( segment );
 870         return -1;
 871     }
 872
 873     fd = vlc_open( segment->psz_filename, O_WRONLY | O_CREAT | O_LARGEFILE |
 874                      O_TRUNC, 0666 );
 875     if ( fd == -1 )
 876     {
 877         msg_Err( p_access, "cannot open `%s' (%s)", segment->psz_filename,
 878                  vlc_strerror_c(errno) );
 879         destroySegment( segment );
 880         return -1;
 881     }
 882
 883     vlc_array_append_or_abort( &p_sys->segments_t, segment );
 884
 885     if( p_sys->psz_keyfile )
 886     {
 887         LoadCryptFile( p_access );
 888     }
 889
 890     if( p_sys->key_uri )
 891     {
 892         segment->psz_key_uri = strdup( p_sys->key_uri );
 893         CryptKey( p_access, i_newseg );
 894         if( p_sys->b_generate_iv )
 895             memcpy( segment->aes_ivs, p_sys->aes_ivs, sizeof(uint8_t)*16 );
 896     }
 897     msg_Dbg( p_access, "Successfully opened livehttp file: %s (%"PRIu32")" , segment->psz_filename, i_newseg );
 898
 899     p_sys->psz_cursegPath = strdup(segment->psz_filename);
 900     p_sys->i_handle = fd;
 901     p_sys->i_segment = i_newseg;
 902     p_sys->b_segment_has_data = false;
 903     return fd;
 904 }
 905 /*****************************************************************************
 906  * CheckSegmentChange: Check if segment needs to be closed and new opened
 907  *****************************************************************************/
 908 static int CheckSegmentChange( sout_access_out_t *p_access, block_t *p_buffer )
 909 {
 910     sout_access_out_sys_t *p_sys = p_access->p_sys;
 911     ssize_t writevalue = 0;
 912
 913     if( p_sys->i_handle > 0 && p_sys->b_segment_has_data &&
 914        (( p_buffer->i_length + p_buffer->i_dts - p_sys->i_opendts ) >= p_sys->i_seglenm ) )
 915     {
 916         writevalue = writeSegment( p_access );
 917         if( unlikely( writevalue < 0 ) )
 918         {
 919             block_ChainRelease ( p_buffer );
 920             return -1;
 921         }
 922         closeCurrentSegment( p_access, p_sys, false );
 923         return writevalue;
 924     }
 925
 926     if ( unlikely( p_sys->i_handle < 0 ) )
 927     {
 928         p_sys->i_opendts = p_buffer->i_dts;
 929
 930         if( p_sys->ongoing_segment && ( p_sys->ongoing_segment->i_dts < p_sys->i_opendts) )
 931             p_sys->i_opendts = p_sys->ongoing_segment->i_dts;
 932
 933         if( p_sys->full_segments && ( p_sys->full_segments->i_dts < p_sys->i_opendts) )
 934             p_sys->i_opendts = p_sys->full_segments->i_dts;
 935
 936         msg_Dbg( p_access, "Setting new opendts %"PRId64, p_sys->i_opendts );
 937
 938         if ( openNextFile( p_access, p_sys ) < 0 )
 939            return -1;
 940     }
 941     return writevalue;
 942 }
 943
 944 static ssize_t writeSegment( sout_access_out_t *p_access )
 945 {
 946     sout_access_out_sys_t *p_sys = p_access->p_sys;
 947     msg_Dbg( p_access, "Writing all full segments" );
 948
 949     block_t *output = p_sys->full_segments;
 950     mtime_t output_last_length = 0;
 951     if( output )
 952         output_last_length = output->i_length;
 953     if( *p_sys->full_segments_end )
 954         output_last_length = (*p_sys->full_segments_end)->i_length;
 955     p_sys->full_segments = NULL;
 956     p_sys->full_segments_end = &p_sys->full_segments;
 957
 958     ssize_t i_write=0;
 959     bool crypted = false;
 960     while( output )
 961     {
 962         if( p_sys->key_uri && !crypted )
 963         {
 964             if( p_sys->stuffing_size )
 965             {
 966                 output = block_Realloc( output, p_sys->stuffing_size, output->i_buffer );
 967                 if( unlikely(!output ) )
 968                     return VLC_ENOMEM;
 969                 memcpy( output->p_buffer, p_sys->stuffing_bytes, p_sys->stuffing_size );
 970                 p_sys->stuffing_size = 0;
 971             }
 972             size_t original = output->i_buffer;
 973             size_t padded = (output->i_buffer + 15 ) & ~15;
 974             size_t pad = padded - original;
 975             if( pad )
 976             {
 977                 p_sys->stuffing_size = 16-pad;
 978                 output->i_buffer -= p_sys->stuffing_size;
 979                 memcpy(p_sys->stuffing_bytes, &output->p_buffer[output->i_buffer], p_sys->stuffing_size);
 980             }
 981
 982             gcry_error_t err = gcry_cipher_encrypt( p_sys->aes_ctx,
 983                                 output->p_buffer, output->i_buffer, NULL, 0 );
 984             if( err )
 985             {
 986                 msg_Err( p_access, "Encryption failure: %s ", gpg_strerror(err) );
 987                 return -1;
 988             }
 989             crypted=true;
 990
 991         }
 992
 993         ssize_t val = vlc_write( p_sys->i_handle, output->p_buffer, output->i_buffer );
 994         if ( val == -1 )
 995         {
 996            if ( errno == EINTR )
 997               continue;
 998            return -1;
 999         }
1000
1001         p_sys->f_seglen =
1002             (float)(output_last_length +
1003                     output->i_dts - p_sys->i_opendts) / CLOCK_FREQ;
1004
1005         if ( (size_t)val >= output->i_buffer )
1006         {
1007            block_t *p_next = output->p_next;
1008            block_Release (output);
1009            output = p_next;
1010            crypted=false;
1011         }
1012         else
1013         {
1014            output->p_buffer += val;
1015            output->i_buffer -= val;
1016         }
1017         i_write += val;
1018     }
1019     return i_write;
1020 }
1021
1022 /*****************************************************************************
1023  * Write: standard write on a file descriptor.
1024  *****************************************************************************/
1025 static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
1026 {
1027     size_t i_write = 0;
1028     sout_access_out_sys_t *p_sys = p_access->p_sys;
1029     while( p_buffer )
1030     {
1031         /* Check if current block is already past segment-length
1032             and we want to write gathered blocks into segment
1033             and update playlist */
1034         if( p_sys->ongoing_segment && ( p_sys->b_splitanywhere  || ( p_buffer->i_flags & BLOCK_FLAG_HEADER ) ) )
1035         {
1036             msg_Dbg( p_access, "Moving ongoing segment to full segments-queue" );
1037             block_ChainLastAppend( &p_sys->full_segments_end, p_sys->ongoing_segment );
1038             p_sys->ongoing_segment = NULL;
1039             p_sys->ongoing_segment_end = &p_sys->ongoing_segment;
1040             p_sys->b_segment_has_data = true;
1041         }
1042
1043         ssize_t ret = CheckSegmentChange( p_access, p_buffer );
1044         if( ret < 0 )
1045         {
1046             msg_Err( p_access, "Error in write loop");
1047             return ret;
1048         }
1049         i_write += ret;
1050
1051         block_t *p_temp = p_buffer->p_next;
1052         p_buffer->p_next = NULL;
1053         block_ChainLastAppend( &p_sys->ongoing_segment_end, p_buffer );
1054         p_buffer = p_temp;
1055     }
1056
1057     return i_write;
1058 }