/*****************************************************************************
 * livehttp.c: Live HTTP Streaming
 *****************************************************************************
 * Copyright © 2001, 2002, 2013 VLC authors and VideoLAN
 * Copyright © 2009-2010 by Keary Griffin
 *
 * Authors: Keary Griffin <kearygriffin at gmail.com>
 *          Ilkka Ollakka <ileoo at videolan dot org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <sys/types.h>
#include <time.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_sout.h>
#include <vlc_block.h>
#include <vlc_fs.h>
#include <vlc_strings.h>
#include <vlc_charset.h>

#include <gcrypt.h>
#include <vlc_gcrypt.h>

#include <vlc_rand.h>

#ifndef O_LARGEFILE
#   define O_LARGEFILE 0
#endif

#define STR_ENDLIST "#EXT-X-ENDLIST\n"

#define MAX_RENAME_RETRIES        10

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

#define SOUT_CFG_PREFIX "sout-livehttp-"
#define SEGLEN_TEXT N_("Segment length")
#define SEGLEN_LONGTEXT N_("Length of TS stream segments")

#define SPLITANYWHERE_TEXT N_("Split segments anywhere")
#define SPLITANYWHERE_LONGTEXT N_("Don't require a keyframe before splitting "\
                                "a segment. Needed for audio only.")

#define NUMSEGS_TEXT N_("Number of segments")
#define NUMSEGS_LONGTEXT N_("Number of segments to include in index")

#define NOCACHE_TEXT N_("Allow cache")
#define NOCACHE_LONGTEXT N_("Add EXT-X-ALLOW-CACHE:NO directive in playlist-file if this is disabled")

#define INDEX_TEXT N_("Index file")
#define INDEX_LONGTEXT N_("Path to the index file to create")

#define INDEXURL_TEXT N_("Full URL to put in index file")
#define INDEXURL_LONGTEXT N_("Full URL to put in index file. "\
                          "Use #'s to represent segment number")

#define DELSEGS_TEXT N_("Delete segments")
#define DELSEGS_LONGTEXT N_("Delete segments when they are no longer needed")

#define RATECONTROL_TEXT N_("Use muxers rate control mechanism")

#define KEYURI_TEXT N_("AES key URI to place in playlist")

#define KEYFILE_TEXT N_("AES key file")
#define KEYFILE_LONGTEXT N_("File containing the 16 bytes encryption key")

#define KEYLOADFILE_TEXT N_("File where vlc reads key-uri and keyfile-location")
#define KEYLOADFILE_LONGTEXT N_("File is read when segment starts and is assumet to be in format: "\
                                "key-uri\\nkey-file. File is read on the segment opening and "\
                                "values are used on that segment.")

#define RANDOMIV_TEXT N_("Use randomized IV for encryption")
#define RANDOMIV_LONGTEXT N_("Generate IV instead using segment-number as IV")

#define INTITIAL_SEG_TEXT N_("Number of first segment")
#define INITIAL_SEG_LONGTEXT N_("The number of the first segment generated")

vlc_module_begin ()
    set_description( N_("HTTP Live streaming output") )
    set_shortname( N_("LiveHTTP" ))
    add_shortcut( "livehttp" )
    set_capability( "sout access", 0 )
    set_category( CAT_SOUT )
    set_subcategory( SUBCAT_SOUT_ACO )
    add_integer( SOUT_CFG_PREFIX "seglen", 10, SEGLEN_TEXT, SEGLEN_LONGTEXT, false )
    add_integer( SOUT_CFG_PREFIX "numsegs", 0, NUMSEGS_TEXT, NUMSEGS_LONGTEXT, false )
    add_integer( SOUT_CFG_PREFIX "initial-segment-number", 1, INTITIAL_SEG_TEXT, INITIAL_SEG_LONGTEXT, false )
    add_bool( SOUT_CFG_PREFIX "splitanywhere", false,
              SPLITANYWHERE_TEXT, SPLITANYWHERE_LONGTEXT, true )
    add_bool( SOUT_CFG_PREFIX "delsegs", true,
              DELSEGS_TEXT, DELSEGS_LONGTEXT, true )
    add_bool( SOUT_CFG_PREFIX "ratecontrol", false,
              RATECONTROL_TEXT, RATECONTROL_TEXT, true )
    add_bool( SOUT_CFG_PREFIX "caching", false,
              NOCACHE_TEXT, NOCACHE_LONGTEXT, true )
    add_bool( SOUT_CFG_PREFIX "generate-iv", false,
              RANDOMIV_TEXT, RANDOMIV_LONGTEXT, true )
    add_string( SOUT_CFG_PREFIX "index", NULL,
                INDEX_TEXT, INDEX_LONGTEXT, false )
    add_string( SOUT_CFG_PREFIX "index-url", NULL,
                INDEXURL_TEXT, INDEXURL_LONGTEXT, false )
    add_string( SOUT_CFG_PREFIX "key-uri", NULL,
                KEYURI_TEXT, KEYURI_TEXT, true )
    add_loadfile( SOUT_CFG_PREFIX "key-file", NULL,
                KEYFILE_TEXT, KEYFILE_LONGTEXT, true )
    add_loadfile( SOUT_CFG_PREFIX "key-loadfile", NULL,
                KEYLOADFILE_TEXT, KEYLOADFILE_LONGTEXT, true )
    set_callbacks( Open, Close )
vlc_module_end ()


/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/
static const char *const ppsz_sout_options[] = {
    "seglen",
    "splitanywhere",
    "numsegs",
    "delsegs",
    "index",
    "index-url",
    "ratecontrol",
    "caching",
    "key-uri",
    "key-file",
    "key-loadfile",
    "generate-iv",
    "initial-segment-number",
    NULL
};

static ssize_t Write( sout_access_out_t *, block_t * );
static int Seek ( sout_access_out_t *, off_t  );
static int Control( sout_access_out_t *, int, va_list );

typedef struct output_segment
{
    char *psz_filename;
    char *psz_uri;
    char *psz_key_uri;
    char *psz_duration;
    float f_seglength;
    uint32_t i_segment_number;
    uint8_t aes_ivs[16];
} output_segment_t;

struct sout_access_out_sys_t
{
    char *psz_cursegPath;
    char *psz_indexPath;
    char *psz_indexUrl;
    char *psz_keyfile;
    mtime_t i_keyfile_modification;
    mtime_t i_opendts;
    mtime_t i_dts_offset;
    mtime_t  i_seglenm;
    uint32_t i_segment;
    size_t  i_seglen;
    float   f_seglen;
    block_t *block_buffer;
    int i_handle;
    unsigned i_numsegs;
    unsigned i_initial_segment;
    bool b_delsegs;
    bool b_ratecontrol;
    bool b_splitanywhere;
    bool b_caching;
    bool b_generate_iv;
    bool b_segment_has_data;
    uint8_t aes_ivs[16];
    gcry_cipher_hd_t aes_ctx;
    char *key_uri;
    uint8_t stuffing_bytes[16];
    ssize_t stuffing_size;
    vlc_array_t *segments_t;
};

static int LoadCryptFile( sout_access_out_t *p_access);
static int CryptSetup( sout_access_out_t *p_access, char *keyfile );
static int CheckSegmentChange( sout_access_out_t *p_access, block_t *p_buffer );
static ssize_t writeSegment( sout_access_out_t *p_access );
static ssize_t openNextFile( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys );
/*****************************************************************************
 * Open: open the file
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    sout_access_out_t   *p_access = (sout_access_out_t*)p_this;
    sout_access_out_sys_t *p_sys;
    char *psz_idx;

    config_ChainParse( p_access, SOUT_CFG_PREFIX, ppsz_sout_options, p_access->p_cfg );

    if( !p_access->psz_path )
    {
        msg_Err( p_access, "no file name specified" );
        return VLC_EGENERIC;
    }

    if( unlikely( !( p_sys = calloc ( 1, sizeof( *p_sys ) ) ) ) )
        return VLC_ENOMEM;

    p_sys->i_seglen = var_GetInteger( p_access, SOUT_CFG_PREFIX "seglen" );
    /* Try to get within asked segment length */
    p_sys->i_seglenm = CLOCK_FREQ * p_sys->i_seglen;
    p_sys->block_buffer = NULL;

    p_sys->i_numsegs = var_GetInteger( p_access, SOUT_CFG_PREFIX "numsegs" );
    p_sys->i_initial_segment = var_GetInteger( p_access, SOUT_CFG_PREFIX "initial-segment-number" );
    p_sys->b_splitanywhere = var_GetBool( p_access, SOUT_CFG_PREFIX "splitanywhere" );
    p_sys->b_delsegs = var_GetBool( p_access, SOUT_CFG_PREFIX "delsegs" );
    p_sys->b_ratecontrol = var_GetBool( p_access, SOUT_CFG_PREFIX "ratecontrol") ;
    p_sys->b_caching = var_GetBool( p_access, SOUT_CFG_PREFIX "caching") ;
    p_sys->b_generate_iv = var_GetBool( p_access, SOUT_CFG_PREFIX "generate-iv") ;
    p_sys->b_segment_has_data = false;

    p_sys->segments_t = vlc_array_new();

    p_sys->stuffing_size = 0;
    p_sys->i_opendts = VLC_TS_INVALID;
    p_sys->i_dts_offset  = 0;

    p_sys->psz_indexPath = NULL;
    psz_idx = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "index" );
    if ( psz_idx )
    {
        char *psz_tmp;
        psz_tmp = str_format_time( psz_idx );
        free( psz_idx );
        if ( !psz_tmp )
        {
            free( p_sys );
            return VLC_ENOMEM;
        }
        path_sanitize( psz_tmp );
        p_sys->psz_indexPath = psz_tmp;
        vlc_unlink( p_sys->psz_indexPath );
    }

    p_sys->psz_indexUrl = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "index-url" );
    p_sys->psz_keyfile  = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "key-loadfile" );
    p_sys->key_uri      = var_GetNonEmptyString( p_access, SOUT_CFG_PREFIX "key-uri" );

    p_access->p_sys = p_sys;

    if( p_sys->psz_keyfile && ( LoadCryptFile( p_access ) < 0 ) )
    {
        free( p_sys->psz_indexUrl );
        free( p_sys->psz_indexPath );
        free( p_sys );
        msg_Err( p_access, "Encryption init failed" );
        return VLC_EGENERIC;
    }
    else if( !p_sys->psz_keyfile && ( CryptSetup( p_access, NULL ) < 0 ) )
    {
        free( p_sys->psz_indexUrl );
        free( p_sys->psz_indexPath );
        free( p_sys );
        msg_Err( p_access, "Encryption init failed" );
        return VLC_EGENERIC;
    }

    p_sys->i_handle = -1;
    p_sys->i_segment = p_sys->i_initial_segment > 0 ? p_sys->i_initial_segment -1 : 0;
    p_sys->psz_cursegPath = NULL;

    p_access->pf_write = Write;
    p_access->pf_seek  = Seek;
    p_access->pf_control = Control;

    return VLC_SUCCESS;
}

/************************************************************************
 * CryptSetup: Initialize encryption
 ************************************************************************/
static int CryptSetup( sout_access_out_t *p_access, char *key_file )
{
    sout_access_out_sys_t *p_sys = p_access->p_sys;
    uint8_t key[16];
    char *keyfile = NULL;

    if( !p_sys->key_uri ) /*No key uri, assume no encryption wanted*/
    {
        msg_Dbg( p_access, "No key uri, no encryption");
        return VLC_SUCCESS;
    }

    if( key_file )
        keyfile = strdup( key_file );
    else
        keyfile = var_InheritString( p_access, SOUT_CFG_PREFIX "key-file" );

    if( unlikely(keyfile == NULL) )
    {
        msg_Err( p_access, "No key-file, no encryption" );
        return VLC_EGENERIC;
    }

    vlc_gcrypt_init();

    /*Setup encryption cipher*/
    gcry_error_t err = gcry_cipher_open( &p_sys->aes_ctx, GCRY_CIPHER_AES,
                                         GCRY_CIPHER_MODE_CBC, 0 );
    if( err )
    {
        msg_Err( p_access, "Openin AES Cipher failed: %s", gpg_strerror(err));
        free( keyfile );
        return VLC_EGENERIC;
    }

    int keyfd = vlc_open( keyfile, O_RDONLY | O_NONBLOCK );
    if( unlikely( keyfd == -1 ) )
    {
        msg_Err( p_access, "Unable to open keyfile %s: %s", keyfile,
                 vlc_strerror_c(errno) );
        free( keyfile );
        gcry_cipher_close( p_sys->aes_ctx );
        return VLC_EGENERIC;
    }
    free( keyfile );

    ssize_t keylen = read( keyfd, key, 16 );

    close( keyfd );
    if( keylen < 16 )
    {
        msg_Err( p_access, "No key at least 16 octects (you provided %zd), no encryption", keylen );
        gcry_cipher_close( p_sys->aes_ctx );
        return VLC_EGENERIC;
    }

    err = gcry_cipher_setkey( p_sys->aes_ctx, key, 16 );
    if(err)
    {
        msg_Err(p_access, "Setting AES key failed: %s", gpg_strerror(err));
        gcry_cipher_close( p_sys->aes_ctx );
        return VLC_EGENERIC;
    }

    if( p_sys->b_generate_iv )
        vlc_rand_bytes( p_sys->aes_ivs, sizeof(uint8_t)*16);

    return VLC_SUCCESS;
}


/************************************************************************
 * LoadCryptFile: Try to parse key_uri and keyfile-location from file
 ************************************************************************/
static int LoadCryptFile( sout_access_out_t *p_access )
{
    sout_access_out_sys_t *p_sys = p_access->p_sys;

    FILE *stream = vlc_fopen( p_sys->psz_keyfile, "rt" );
    char *key_file=NULL,*key_uri=NULL;

    if( unlikely( stream == NULL ) )
    {
        msg_Err( p_access, "Unable to open keyloadfile %s: %s",
                 p_sys->psz_keyfile, vlc_strerror_c(errno) );
        return VLC_EGENERIC;
    }


    //First read key_uri
    ssize_t len = getline( &key_uri, &(size_t){0}, stream );
    if( unlikely( len == -1 ) )
    {
        msg_Err( p_access, "Cannot read %s: %s", p_sys->psz_keyfile,
                 vlc_strerror_c(errno) );
        clearerr( stream );
        fclose( stream );
        free( key_uri );
        return VLC_EGENERIC;
    }
    //Strip the newline from uri, maybe scanf would be better?
    key_uri[len-1]='\0';

    len = getline( &key_file, &(size_t){0}, stream );
    if( unlikely( len == -1 ) )
    {
        msg_Err( p_access, "Cannot read %s: %s", p_sys->psz_keyfile,
                 vlc_strerror_c(errno) );
        clearerr( stream );
        fclose( stream );

        free( key_uri );
        free( key_file );
        return VLC_EGENERIC;
    }
    // Strip the last newline from filename
    key_file[len-1]='\0';
    fclose( stream );

    int returncode = VLC_SUCCESS;
    if( !p_sys->key_uri || strcmp( p_sys->key_uri, key_uri ) )
    {
        if( p_sys->key_uri )
        {
            free( p_sys->key_uri );
            p_sys->key_uri = NULL;
        }
        p_sys->key_uri = strdup( key_uri );
        returncode = CryptSetup( p_access, key_file );
    }
    free( key_file );
    free( key_uri );
    return returncode;
}

/************************************************************************
 * CryptKey: Set encryption IV to current segment number
 ************************************************************************/
static int CryptKey( sout_access_out_t *p_access, uint32_t i_segment )
{
    sout_access_out_sys_t *p_sys = p_access->p_sys;

    if( !p_sys->b_generate_iv )
    {
        /* Use segment number as IV if randomIV isn't selected*/
        memset( p_sys->aes_ivs, 0, 16 * sizeof(uint8_t));
        p_sys->aes_ivs[15] = i_segment & 0xff;
        p_sys->aes_ivs[14] = (i_segment >> 8 ) & 0xff;
        p_sys->aes_ivs[13] = (i_segment >> 16 ) & 0xff;
        p_sys->aes_ivs[12] = (i_segment >> 24 ) & 0xff;
    }

    gcry_error_t err = gcry_cipher_setiv( p_sys->aes_ctx,
                                          p_sys->aes_ivs, 16);
    if( err )
    {
        msg_Err(p_access, "Setting AES IVs failed: %s", gpg_strerror(err) );
        gcry_cipher_close( p_sys->aes_ctx);
        return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}


#define SEG_NUMBER_PLACEHOLDER "#"
/*****************************************************************************
 * formatSegmentPath: create segment path name based on seg #
 *****************************************************************************/
static char *formatSegmentPath( char *psz_path, uint32_t i_seg, bool b_sanitize )
{
    char *psz_result;
    char *psz_firstNumSign;

    if ( ! ( psz_result  = str_format_time( psz_path ) ) )
        return NULL;

    psz_firstNumSign = psz_result + strcspn( psz_result, SEG_NUMBER_PLACEHOLDER );
    if ( *psz_firstNumSign )
    {
        char *psz_newResult;
        int i_cnt = strspn( psz_firstNumSign, SEG_NUMBER_PLACEHOLDER );
        int ret;

        *psz_firstNumSign = '\0';
        ret = asprintf( &psz_newResult, "%s%0*d%s", psz_result, i_cnt, i_seg, psz_firstNumSign + i_cnt );
        free ( psz_result );
        if ( ret < 0 )
            return NULL;
        psz_result = psz_newResult;
    }

    if ( b_sanitize )
        path_sanitize( psz_result );

    return psz_result;
}

static void destroySegment( output_segment_t *segment )
{
    free( segment->psz_filename );
    free( segment->psz_duration );
    free( segment->psz_uri );
    free( segment->psz_key_uri );
    free( segment );
}

/************************************************************************
 * segmentAmountNeeded: check that playlist has atleast 3*p_sys->i_seglength of segments
 * return how many segments are needed for that (max of p_sys->i_segment )
 ************************************************************************/
static uint32_t segmentAmountNeeded( sout_access_out_sys_t *p_sys )
{
    float duration = .0f;
    for( unsigned index = 1; (int)index <= vlc_array_count( p_sys->segments_t ); index++ )
    {
        output_segment_t* segment = vlc_array_item_at_index( p_sys->segments_t, vlc_array_count( p_sys->segments_t ) - index );
        duration += segment->f_seglength;

        if( duration >= (float)( 3 * p_sys->i_seglen ) )
            return __MAX(index, p_sys->i_numsegs);
    }
    return vlc_array_count( p_sys->segments_t )-1;

}


/************************************************************************
 * isFirstItemRemovable: Check for draft 11 section 6.2.2
 * check that the first item has been around outside playlist
 * segment->f_seglength + (p_sys->i_numsegs * p_sys->i_seglen) before it is removed.
 ************************************************************************/
static bool isFirstItemRemovable( sout_access_out_sys_t *p_sys, uint32_t i_firstseg, uint32_t i_index_offset )
{
    float duration = .0f;

    /* Check that segment has been out of playlist for seglenght + (p_sys->i_numsegs * p_sys->i_seglen) amount
     * We check this by calculating duration of the items that replaced first item in playlist
     */
    for( unsigned int index = 0; index < i_index_offset; index++ )
    {
        output_segment_t *segment = vlc_array_item_at_index( p_sys->segments_t, p_sys->i_segment - i_firstseg + index );
        duration += segment->f_seglength;
    }
    output_segment_t *first = vlc_array_item_at_index( p_sys->segments_t, 0 );

    return duration >= (first->f_seglength + (float)(p_sys->i_numsegs * p_sys->i_seglen));
}

/************************************************************************
 * updateIndexAndDel: If necessary, update index file & delete old segments
 ************************************************************************/
static int updateIndexAndDel( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys, bool b_isend )
{

    uint32_t i_firstseg;
    unsigned i_index_offset = 0;

    if ( p_sys->i_numsegs == 0 ||
         p_sys->i_segment < ( p_sys->i_numsegs + p_sys->i_initial_segment ) )
    {
        i_firstseg = p_sys->i_initial_segment == 0 ? 1 : p_sys->i_initial_segment;
    }
    else
    {
        unsigned numsegs = segmentAmountNeeded( p_sys );
        i_firstseg = ( p_sys->i_segment - numsegs ) + 1;
        i_index_offset = vlc_array_count( p_sys->segments_t ) - numsegs;
    }

    // First update index
    if ( p_sys->psz_indexPath )
    {
        int val;
        FILE *fp;
        char *psz_idxTmp;
        if ( asprintf( &psz_idxTmp, "%s.tmp", p_sys->psz_indexPath ) < 0)
            return -1;

        fp = vlc_fopen( psz_idxTmp, "wt");
        if ( !fp )
        {
            msg_Err( p_access, "cannot open index file `%s'", psz_idxTmp );
            free( psz_idxTmp );
            return -1;
        }

        if ( fprintf( fp, "#EXTM3U\n#EXT-X-TARGETDURATION:%zu\n#EXT-X-VERSION:3\n#EXT-X-ALLOW-CACHE:%s"
                          "%s\n#EXT-X-MEDIA-SEQUENCE:%"PRIu32"\n", p_sys->i_seglen,
                          p_sys->b_caching ? "YES" : "NO",
                          p_sys->i_numsegs > 0 ? "" : b_isend ? "\n#EXT-X-PLAYLIST-TYPE:VOD" : "\n#EXT-X-PLAYLIST-TYPE:EVENT",
                          i_firstseg ) < 0 )
        {
            free( psz_idxTmp );
            fclose( fp );
            return -1;
        }
        char *psz_current_uri=NULL;


        for ( uint32_t i = i_firstseg; i <= p_sys->i_segment; i++ )
        {
            //scale to i_index_offset..numsegs + i_index_offset
            uint32_t index = i - i_firstseg + i_index_offset;

            output_segment_t *segment = (output_segment_t *)vlc_array_item_at_index( p_sys->segments_t, index );
            if( p_sys->key_uri &&
                ( !psz_current_uri ||  strcmp( psz_current_uri, segment->psz_key_uri ) )
              )
            {
                int ret = 0;
                free( psz_current_uri );
                psz_current_uri = strdup( segment->psz_key_uri );
                if( p_sys->b_generate_iv )
                {
                    unsigned long long iv_hi = segment->aes_ivs[0];
                    unsigned long long iv_lo = segment->aes_ivs[8];
                    for( unsigned short i = 1; i < 8; i++ )
                    {
                        iv_hi <<= 8;
                        iv_hi |= segment->aes_ivs[i] & 0xff;
                        iv_lo <<= 8;
                        iv_lo |= segment->aes_ivs[8+i] & 0xff;
                    }
                    ret = fprintf( fp, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\",IV=0X%16.16llx%16.16llx\n",
                                   segment->psz_key_uri, iv_hi, iv_lo );

                } else {
                    ret = fprintf( fp, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"\n", segment->psz_key_uri );
                }
                if( ret < 0 )
                {
                    free( psz_current_uri );
                    free( psz_idxTmp );
                    fclose( fp );
                    return -1;
                }
            }

            val = fprintf( fp, "#EXTINF:%s,\n%s\n", segment->psz_duration, segment->psz_uri);
            if ( val < 0 )
            {
                free( psz_current_uri );
                free( psz_idxTmp );
                fclose( fp );
                return -1;
            }
        }
        free( psz_current_uri );

        if ( b_isend )
        {
            if ( fputs ( STR_ENDLIST, fp ) < 0)
            {
                free( psz_idxTmp );
                fclose( fp ) ;
                return -1;
            }

        }
        fclose( fp );

        val = vlc_rename ( psz_idxTmp, p_sys->psz_indexPath);

        if ( val < 0 )
        {
            vlc_unlink( psz_idxTmp );
            msg_Err( p_access, "Error moving LiveHttp index file" );
        }
        else
            msg_Dbg( p_access, "LiveHttpIndexComplete: %s" , p_sys->psz_indexPath );

        free( psz_idxTmp );
    }

    // Then take care of deletion
    // Try to follow pantos draft 11 section 6.2.2
    while( p_sys->b_delsegs && p_sys->i_numsegs &&
           isFirstItemRemovable( p_sys, i_firstseg, i_index_offset )
         )
    {
         output_segment_t *segment = vlc_array_item_at_index( p_sys->segments_t, 0 );
         msg_Dbg( p_access, "Removing segment number %d", segment->i_segment_number );
         vlc_array_remove( p_sys->segments_t, 0 );

         if ( segment->psz_filename )
         {
             vlc_unlink( segment->psz_filename );
         }

         destroySegment( segment );
         i_index_offset -=1;
    }


    return 0;
}

/*****************************************************************************
 * closeCurrentSegment: Close the segment file
 *****************************************************************************/
static void closeCurrentSegment( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys, bool b_isend )
{
    if ( p_sys->i_handle >= 0 )
    {
        output_segment_t *segment = (output_segment_t *)vlc_array_item_at_index( p_sys->segments_t, vlc_array_count( p_sys->segments_t ) - 1 );

        if( p_sys->key_uri )
        {
            size_t pad = 16 - p_sys->stuffing_size;
            memset(&p_sys->stuffing_bytes[p_sys->stuffing_size], pad, pad);
            gcry_error_t err = gcry_cipher_encrypt( p_sys->aes_ctx, p_sys->stuffing_bytes, 16, NULL, 0 );

            if( err ) {
               msg_Err( p_access, "Couldn't encrypt 16 bytes: %s", gpg_strerror(err) );
            } else {
            int ret = write( p_sys->i_handle, p_sys->stuffing_bytes, 16 );
            if( ret != 16 )
                msg_Err( p_access, "Couldn't write 16 bytes" );
            }
            p_sys->stuffing_size = 0;
        }


        close( p_sys->i_handle );
        p_sys->i_handle = -1;

        if( ! ( us_asprintf( &segment->psz_duration, "%.2f", p_sys->f_seglen ) ) )
        {
            msg_Err( p_access, "Couldn't set duration on closed segment");
            return;
        }
        segment->f_seglength = p_sys->f_seglen;

        segment->i_segment_number = p_sys->i_segment;

        if ( p_sys->psz_cursegPath )
        {
            msg_Dbg( p_access, "LiveHttpSegmentComplete: %s (%"PRIu32")" , p_sys->psz_cursegPath, p_sys->i_segment );
            free( p_sys->psz_cursegPath );
            p_sys->psz_cursegPath = 0;
            updateIndexAndDel( p_access, p_sys, b_isend );
        }
    }
}

/*****************************************************************************
 * Close: close the target
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    sout_access_out_t *p_access = (sout_access_out_t*)p_this;
    sout_access_out_sys_t *p_sys = p_access->p_sys;
    block_t *output_block = p_sys->block_buffer;
    p_sys->block_buffer = NULL;

    while( output_block )
    {
        block_t *p_next = output_block->p_next;
        output_block->p_next = NULL;

        /* Since we are flushing, check the segment change by hand and don't wait
         * possible keyframe*/
        if( p_sys->b_segment_has_data &&  (float)(output_block->i_length + p_sys->i_dts_offset +
                     output_block->i_dts - p_sys->i_opendts) >= p_sys->i_seglenm )
        {
            closeCurrentSegment( p_access, p_sys, false );
            p_sys->i_dts_offset = 0;
            if( unlikely(openNextFile( p_access, p_sys ) < 0 ) )
            {
                block_ChainRelease( output_block );
                output_block = NULL;
                block_ChainRelease( p_next );

                /* Jump out of the loop so we can close rest of the stuff*/
                continue;
            }
            p_sys->i_opendts = p_sys->block_buffer ? p_sys->block_buffer->i_dts : output_block->i_dts;
        }
        Write( p_access, output_block );
        output_block = p_next;
    }

    ssize_t writevalue = writeSegment( p_access );
    msg_Dbg( p_access, "Writing.. %zd", writevalue );
    if( unlikely( writevalue < 0 ) )
    {
        block_ChainRelease( p_sys->block_buffer );
        p_sys->block_buffer = NULL;
    }

    closeCurrentSegment( p_access, p_sys, true );

    if( p_sys->key_uri )
    {
        gcry_cipher_close( p_sys->aes_ctx );
        free( p_sys->key_uri );
    }

    while( vlc_array_count( p_sys->segments_t ) > 0 )
    {
        output_segment_t *segment = vlc_array_item_at_index( p_sys->segments_t, 0 );
        vlc_array_remove( p_sys->segments_t, 0 );
        if( p_sys->b_delsegs && p_sys->i_numsegs && segment->psz_filename )
        {
            msg_Dbg( p_access, "Removing segment number %d name %s", segment->i_segment_number, segment->psz_filename );
            vlc_unlink( segment->psz_filename );
        }

        destroySegment( segment );
    }
    vlc_array_destroy( p_sys->segments_t );

    free( p_sys->psz_indexUrl );
    free( p_sys->psz_indexPath );
    free( p_sys );

    msg_Dbg( p_access, "livehttp access output closed" );
}

static int Control( sout_access_out_t *p_access, int i_query, va_list args )
{
    sout_access_out_sys_t *p_sys = p_access->p_sys;

    switch( i_query )
    {
        case ACCESS_OUT_CONTROLS_PACE:
        {
            bool *pb = va_arg( args, bool * );
            *pb = !p_sys->b_ratecontrol;
            //*pb = true;
            break;
        }

        default:
            return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

/*****************************************************************************
 * openNextFile: Open the segment file
 *****************************************************************************/
static ssize_t openNextFile( sout_access_out_t *p_access, sout_access_out_sys_t *p_sys )
{
    int fd;

    uint32_t i_newseg = p_sys->i_segment + 1;

    /* Create segment and fill it info that we can (everything excluding duration */
    output_segment_t *segment = (output_segment_t*)calloc(1, sizeof(output_segment_t));
    if( unlikely( !segment ) )
        return -1;

    segment->i_segment_number = i_newseg;
    segment->psz_filename = formatSegmentPath( p_access->psz_path, i_newseg, true );
    char *psz_idxFormat = p_sys->psz_indexUrl ? p_sys->psz_indexUrl : p_access->psz_path;
    segment->psz_uri = formatSegmentPath( psz_idxFormat , i_newseg, false );

    if ( unlikely( !segment->psz_filename ) )
    {
        msg_Err( p_access, "Format segmentpath failed");
        destroySegment( segment );
        return -1;
    }

    fd = vlc_open( segment->psz_filename, O_WRONLY | O_CREAT | O_LARGEFILE |
                     O_TRUNC, 0666 );
    if ( fd == -1 )
    {
        msg_Err( p_access, "cannot open `%s' (%s)", segment->psz_filename,
                 vlc_strerror_c(errno) );
        destroySegment( segment );
        return -1;
    }

    vlc_array_append( p_sys->segments_t, segment);

    if( p_sys->psz_keyfile )
    {
        LoadCryptFile( p_access );
    }

    if( p_sys->key_uri )
    {
        segment->psz_key_uri = strdup( p_sys->key_uri );
        CryptKey( p_access, i_newseg );
        if( p_sys->b_generate_iv )
            memcpy( segment->aes_ivs, p_sys->aes_ivs, sizeof(uint8_t)*16 );
    }
    msg_Dbg( p_access, "Successfully opened livehttp file: %s (%"PRIu32")" , segment->psz_filename, i_newseg );

    p_sys->psz_cursegPath = strdup(segment->psz_filename);
    p_sys->i_handle = fd;
    p_sys->i_segment = i_newseg;
    p_sys->b_segment_has_data = false;
    return fd;
}
/*****************************************************************************
 * CheckSegmentChange: Check if segment needs to be closed and new opened
 *****************************************************************************/
static int CheckSegmentChange( sout_access_out_t *p_access, block_t *p_buffer )
{
    sout_access_out_sys_t *p_sys = p_access->p_sys;
    block_t *output = p_sys->block_buffer;

    /* let's check if we need to store offset to keep
     * better count of actual duration */
    if( unlikely( p_buffer->i_dts < p_sys->i_opendts ) )
    {
        block_t *last_buffer = p_sys->block_buffer;
        while( last_buffer->p_next )
            last_buffer = last_buffer->p_next;
        p_sys->i_dts_offset += last_buffer->i_dts - p_sys->i_opendts;
        p_sys->i_opendts    = p_buffer->i_dts;
        msg_Dbg( p_access, "dts offset %"PRId64, p_sys->i_dts_offset );
    }

    if( p_sys->i_handle > 0 && p_sys->b_segment_has_data &&
       (( p_buffer->i_length + p_buffer->i_dts - p_sys->i_opendts +
          p_sys->i_dts_offset ) >= p_sys->i_seglenm ) )
    {
        closeCurrentSegment( p_access, p_sys, false );
    }

    if ( unlikely( p_sys->i_handle < 0 ) )
    {
        p_sys->i_dts_offset = 0;
        p_sys->i_opendts = output ? output->i_dts : p_buffer->i_dts;
        //For first segment we can get negative duration otherwise...?
        if( ( p_sys->i_opendts != VLC_TS_INVALID ) &&
            ( p_buffer->i_dts < p_sys->i_opendts ) )
            p_sys->i_opendts = p_buffer->i_dts;

        if ( openNextFile( p_access, p_sys ) < 0 )
           return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

static ssize_t writeSegment( sout_access_out_t *p_access )
{
    sout_access_out_sys_t *p_sys = p_access->p_sys;
    block_t *output = p_sys->block_buffer ? block_ChainGather( p_sys->block_buffer ) : NULL;
    p_sys->block_buffer = NULL;
    ssize_t i_write=0;
    bool crypted = false;
    while( output )
    {
        if( p_sys->key_uri && !crypted )
        {
            if( p_sys->stuffing_size )
            {
                output = block_Realloc( output, p_sys->stuffing_size, output->i_buffer );
                if( unlikely(!output ) )
                    return VLC_ENOMEM;
                memcpy( output->p_buffer, p_sys->stuffing_bytes, p_sys->stuffing_size );
                p_sys->stuffing_size = 0;
            }
            size_t original = output->i_buffer;
            size_t padded = (output->i_buffer + 15 ) & ~15;
            size_t pad = padded - original;
            if( pad )
            {
                p_sys->stuffing_size = 16-pad;
                output->i_buffer -= p_sys->stuffing_size;
                memcpy(p_sys->stuffing_bytes, &output->p_buffer[output->i_buffer], p_sys->stuffing_size);
            }

            gcry_error_t err = gcry_cipher_encrypt( p_sys->aes_ctx,
                                output->p_buffer, output->i_buffer, NULL, 0 );
            if( err )
            {
                msg_Err( p_access, "Encryption failure: %s ", gpg_strerror(err) );
                return -1;
            }
            crypted=true;

        }
        ssize_t val = write( p_sys->i_handle, output->p_buffer, output->i_buffer );
        if ( val == -1 )
        {
           if ( errno == EINTR )
              continue;
           return -1;
        }

        p_sys->f_seglen =
            (float)(output->i_length +
                    output->i_dts - p_sys->i_opendts + p_sys->i_dts_offset) / CLOCK_FREQ;

        if ( (size_t)val >= output->i_buffer )
        {
           block_t *p_next = output->p_next;
           block_Release (output);
           output = p_next;
           crypted=false;
        }
        else
        {
           output->p_buffer += val;
           output->i_buffer -= val;
        }
        i_write += val;
    }
    return i_write;
}

/*****************************************************************************
 * Write: standard write on a file descriptor.
 *****************************************************************************/
static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
{
    size_t i_write = 0;
    sout_access_out_sys_t *p_sys = p_access->p_sys;
    block_t *p_temp;
    while( p_buffer )
    {
        if( ( p_sys->b_splitanywhere  || ( p_buffer->i_flags & BLOCK_FLAG_HEADER ) ) )
        {
            if( unlikely( CheckSegmentChange( p_access, p_buffer ) != VLC_SUCCESS ) )
            {
                block_ChainRelease ( p_buffer );
                return -1;
            }

            ssize_t writevalue = writeSegment( p_access );
            if( unlikely( writevalue < 0 ) )
            {
                block_ChainRelease ( p_buffer );
                return -1;
            }
            p_sys->b_segment_has_data = true;
            i_write += writevalue;
        }

        p_temp = p_buffer->p_next;
        p_buffer->p_next = NULL;
        block_ChainAppend( &p_sys->block_buffer, p_buffer );
        p_buffer = p_temp;
    }

    return i_write;
}

/*****************************************************************************
 * Seek: seek to a specific location in a file
 *****************************************************************************/
static int Seek( sout_access_out_t *p_access, off_t i_pos )
{
    (void) i_pos;
    msg_Err( p_access, "livehttp sout access cannot seek" );
    return -1;
}
