asx.c 25.6 KB
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/*****************************************************************************
 * asx.c : ASX playlist format import
 *****************************************************************************
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 * Copyright (C) 2005-2006 the VideoLAN team
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 * $Id$
 *
 * Authors: Derk-Jan Hartman <hartman at videolan dot org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 *****************************************************************************/

/* See also: http://msdn.microsoft.com/library/en-us/wmplay10/mmp_sdk/windowsmediametafilereference.asp
 */

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
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#include <vlc_demux.h>
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#include <ctype.h>
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#include <vlc_charset.h>
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#include "playlist.h"
#include "vlc_meta.h"

struct demux_sys_t
{
    char    *psz_prefix;
    char    *psz_data;
    int64_t i_data_len;
    vlc_bool_t b_utf8;
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    vlc_bool_t b_skip_ads;
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};

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int Demux( demux_t *p_demux);
static int Control( demux_t *p_demux, int i_query, va_list args );

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static int StoreString( demux_t *p_demux, char **ppsz_string,
                        const char *psz_source_start,
                        const char *psz_source_end )
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{
    demux_sys_t *p_sys = p_demux->p_sys;
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    unsigned len = psz_source_end - psz_source_start;
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    if( *ppsz_string ) free( *ppsz_string );
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    char *buf = *ppsz_string = malloc ((len * (1 + !p_sys->b_utf8)) + 1);
    if (buf == NULL)
        return VLC_ENOMEM;
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    if( p_sys->b_utf8 )
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    {
        memcpy (buf, psz_source_start, len);
        (*ppsz_string)[len] = '\0';
        EnsureUTF8 (*ppsz_string);
    }
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    else
    {
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        /* Latin-1 -> UTF-8 */
        for (unsigned i = 0; i < len; i++)
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        {
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            unsigned char c = psz_source_start[i];
            if (c & 0x80)
            {
                *buf++ = 0xc0 | (c >> 6);
                *buf++ = 0x80 | (c & 0x3f);
            }
            else
                *buf++ = c;
        }
        *buf++ = '\0';

        buf = *ppsz_string = realloc (*ppsz_string, buf - *ppsz_string);
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    }
    return VLC_SUCCESS;
}

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static char *SkipBlanks(char *s, size_t i_strlen )
{
    while( i_strlen > 0 ) {
        switch( *s )
        {
            case ' ':
            case '\t':
            case '\r':
            case '\n':
                --i_strlen;
                ++s;
                break;
            default:
                i_strlen = 0;
        }
    }
    return s;
}

static int ParseTime(char *s, size_t i_strlen)
{
    // need to parse hour:minutes:sec.fraction string
    int result = 0;
    int val;
    const char *end = s + i_strlen;
    // skip leading spaces if any
    s = SkipBlanks(s, i_strlen);

    val = 0;
    while( (s < end) && isdigit(*s) )
    {
        int newval = val*10 + (*s - '0');
        if( newval < val )
        {
            // overflow
            val = 0;
            break;
        }
        val = newval;
        ++s;
    }
    result = val;
    s = SkipBlanks(s, end-s);
    if( *s == ':' )
    {
        ++s;
        s = SkipBlanks(s, end-s);
        result = result * 60;
        val = 0;
        while( (s < end) && isdigit(*s) )
        {
            int newval = val*10 + (*s - '0');
            if( newval < val )
            {
                // overflow
                val = 0;
                break;
            }
            val = newval;
            ++s;
        }
        result += val;
        s = SkipBlanks(s, end-s);
        if( *s == ':' )
        {
            ++s;
            s = SkipBlanks(s, end-s);
            result = result * 60;
            val = 0;
            while( (s < end) && isdigit(*s) )
            {
                int newval = val*10 + (*s - '0');
                if( newval < val )
                {
                    // overflow
                    val = 0;
                    break;
                }
                val = newval;
                ++s;
            }
            result += val;
            // TODO: one day, we may need to parse fraction for sub-second resolution
        }
    }
    return result;
}

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/*****************************************************************************
 * Import_ASX: main import function
 *****************************************************************************/
int E_(Import_ASX)( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t *)p_this;
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    const uint8_t *p_peek;
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    CHECK_PEEK( p_peek, 10 );
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    // skip over possible leading empty lines and empty spaces
    p_peek = (uint8_t *)SkipBlanks((char *)p_peek, 6);
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    if( POKE( p_peek, "<asx", 4 ) || demux2_IsPathExtension( p_demux, ".asx" ) ||
        demux2_IsPathExtension( p_demux, ".wax" ) || demux2_IsPathExtension( p_demux, ".wvx" ) ||
        demux2_IsForced( p_demux, "asx-open" ) )
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    {
        ;
    }
    else
        return VLC_EGENERIC;
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    STANDARD_DEMUX_INIT_MSG( "found valid ASX playlist" );
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    p_demux->p_sys->psz_prefix = E_(FindPrefix)( p_demux );
    p_demux->p_sys->psz_data = NULL;
    p_demux->p_sys->i_data_len = -1;
    p_demux->p_sys->b_utf8 = VLC_FALSE;
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    p_demux->p_sys->b_skip_ads = config_GetInt( p_demux, "playlist-skip-ads" );
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    return VLC_SUCCESS;
}

/*****************************************************************************
 * Deactivate: frees unused data
 *****************************************************************************/
void E_(Close_ASX)( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t *)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;

    if( p_sys->psz_prefix ) free( p_sys->psz_prefix );
    if( p_sys->psz_data ) free( p_sys->psz_data );
    free( p_sys );
}

static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    char        *psz_parse = NULL;
    char        *psz_backup = NULL;
    vlc_bool_t  b_entry = VLC_FALSE;
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    input_item_t *p_input;
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    INIT_PLAYLIST_STUFF;

    /* init txt */
    if( p_sys->i_data_len < 0 )
    {
        int64_t i_pos = 0;
        p_sys->i_data_len = stream_Size( p_demux->s ) +1; /* This is a cheat to prevent unnecessary realloc */
        if( p_sys->i_data_len <= 0 && p_sys->i_data_len < 16384 ) p_sys->i_data_len = 1024;
        p_sys->psz_data = malloc( p_sys->i_data_len * sizeof(char) +1);
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        /* load the complete file */
        for( ;; )
        {
            int i_read = stream_Read( p_demux->s, &p_sys->psz_data[i_pos], p_sys->i_data_len - i_pos );
            p_sys->psz_data[i_read] = '\0';
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            if( i_read < p_sys->i_data_len - i_pos ) break; /* Done */
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            i_pos += i_read;
            p_sys->i_data_len += 1024;
            p_sys->psz_data = realloc( p_sys->psz_data, p_sys->i_data_len * sizeof( char * ) +1 );
        }
        if( p_sys->i_data_len <= 0 ) return VLC_EGENERIC;
    }

    psz_parse = p_sys->psz_data;
    /* Find first element */
    if( ( psz_parse = strcasestr( psz_parse, "<ASX" ) ) )
    {
        /* ASX element */
        char *psz_string = NULL;
        int i_strlen = 0;

        char *psz_base_asx = NULL;
        char *psz_title_asx = NULL;
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        char *psz_artist_asx = NULL;
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        char *psz_copyright_asx = NULL;
        char *psz_moreinfo_asx = NULL;
        char *psz_abstract_asx = NULL;
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        char *psz_base_entry = NULL;
        char *psz_title_entry = NULL;
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        char *psz_artist_entry = NULL;
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        char *psz_copyright_entry = NULL;
        char *psz_moreinfo_entry = NULL;
        char *psz_abstract_entry = NULL;
        int i_entry_count = 0;
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        vlc_bool_t b_skip_entry = VLC_FALSE;
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        char *psz_href = NULL;
        int i_starttime = 0;
        int i_duration = 0;

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        psz_parse = strcasestr( psz_parse, ">" );

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        while( psz_parse && ( psz_parse = strcasestr( psz_parse, "<" ) ) )
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        {
            if( !strncasecmp( psz_parse, "<!--", 4 ) )
            {
                /* this is a comment */
                if( ( psz_parse = strcasestr( psz_parse, "-->" ) ) )
                    psz_parse+=3;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<PARAM ", 7 ) )
            {
                vlc_bool_t b_encoding_flag = VLC_FALSE;
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                psz_parse = SkipBlanks(psz_parse+7, (unsigned)-1);
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                if( !strncasecmp( psz_parse, "name", 4 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            i_strlen = psz_parse-psz_backup;
                            if( i_strlen < 1 ) continue;
                            msg_Dbg( p_demux, "param name strlen: %d", i_strlen);
                            psz_string = malloc( i_strlen *sizeof( char ) +1);
                            memcpy( psz_string, psz_backup, i_strlen );
                            psz_string[i_strlen] = '\0';
                            msg_Dbg( p_demux, "param name: %s", psz_string);
                            b_encoding_flag = !strcasecmp( psz_string, "encoding" );
                            free( psz_string );
                        }
                        else continue;
                    }
                    else continue;
                }
                psz_parse++;
                if( !strncasecmp( psz_parse, "value", 5 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            i_strlen = psz_parse-psz_backup;
                            if( i_strlen < 1 ) continue;
                            msg_Dbg( p_demux, "param value strlen: %d", i_strlen);
                            psz_string = malloc( i_strlen *sizeof( char ) +1);
                            memcpy( psz_string, psz_backup, i_strlen );
                            psz_string[i_strlen] = '\0';
                            msg_Dbg( p_demux, "param value: %s", psz_string);
                            if( b_encoding_flag && !strcasecmp( psz_string, "utf-8" ) ) p_sys->b_utf8 = VLC_TRUE;
                            free( psz_string );
                        }
                        else continue;
                    }
                    else continue;
                }
                if( ( psz_parse = strcasestr( psz_parse, "/>" ) ) )
                    psz_parse += 2;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<BANNER", 7 ) )
            {
                /* We skip this element */
                if( ( psz_parse = strcasestr( psz_parse, "</BANNER>" ) ) )
                    psz_parse += 9;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<PREVIEWDURATION", 16 ) ||
                     !strncasecmp( psz_parse, "<LOGURL", 7 ) ||
                     !strncasecmp( psz_parse, "<Skin", 5 ) )
            {
                /* We skip this element */
                if( ( psz_parse = strcasestr( psz_parse, "/>" ) ) )
                    psz_parse += 2;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<BASE ", 6 ) )
            {
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                psz_parse = SkipBlanks(psz_parse+6, (unsigned)-1);
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                if( !strncasecmp( psz_parse, "HREF", 4 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            StoreString( p_demux, (b_entry ? &psz_base_entry : &psz_base_asx), psz_backup, psz_parse );
                        }
                        else continue;
                    }
                    else continue;
                }
                if( ( psz_parse = strcasestr( psz_parse, "/>" ) ) )
                    psz_parse += 2;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<TITLE>", 7 ) )
            {
                psz_backup = psz_parse+=7;
                if( ( psz_parse = strcasestr( psz_parse, "</TITLE>" ) ) )
                {
                    StoreString( p_demux, (b_entry ? &psz_title_entry : &psz_title_asx), psz_backup, psz_parse );
                    psz_parse += 8;
                }
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<Author>", 8 ) )
            {
                psz_backup = psz_parse+=8;
                if( ( psz_parse = strcasestr( psz_parse, "</Author>" ) ) )
                {
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                    StoreString( p_demux, (b_entry ? &psz_artist_entry : &psz_artist_asx), psz_backup, psz_parse );
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                    psz_parse += 9;
                }
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<Copyright", 10 ) )
            {
                psz_backup = psz_parse+=11;
                if( ( psz_parse = strcasestr( psz_parse, "</Copyright>" ) ) )
                {
                    StoreString( p_demux, (b_entry ? &psz_copyright_entry : &psz_copyright_asx), psz_backup, psz_parse );
                    psz_parse += 12;
                }
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<MoreInfo ", 10 ) )
            {
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                psz_parse = SkipBlanks(psz_parse+10, (unsigned)-1);
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                if( !strncasecmp( psz_parse, "HREF", 4 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            StoreString( p_demux, (b_entry ? &psz_moreinfo_entry : &psz_moreinfo_asx), psz_backup, psz_parse );
                        }
                        else continue;
                    }
                    else continue;
                }
                if( ( psz_parse = strcasestr( psz_parse, "/>" ) ) )
                    psz_parse += 2;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<ABSTRACT>", 10 ) )
            {
                psz_backup = psz_parse+=10;
                if( ( psz_parse = strcasestr( psz_parse, "</ABSTRACT>" ) ) )
                {
                    StoreString( p_demux, (b_entry ? &psz_abstract_entry : &psz_abstract_asx), psz_backup, psz_parse );
                    psz_parse += 11;
                }
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<EntryRef ", 10 ) )
            {
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                psz_parse = SkipBlanks(psz_parse+10, (unsigned)-1);
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                if( !strncasecmp( psz_parse, "HREF", 4 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            i_strlen = psz_parse-psz_backup;
                            if( i_strlen < 1 ) continue;
                            psz_string = malloc( i_strlen*sizeof( char ) +1);
                            memcpy( psz_string, psz_backup, i_strlen );
                            psz_string[i_strlen] = '\0';
                            p_input = input_ItemNew( p_playlist, psz_string, psz_title_asx );
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                            input_ItemCopyOptions( p_current_input, p_input );
                            input_ItemAddSubItem( p_current_input, p_input );
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                            free( psz_string );
                        }
                        else continue;
                    }
                    else continue;
                }
                if( ( psz_parse = strcasestr( psz_parse, "/>" ) ) )
                    psz_parse += 2;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "</Entry>", 8 ) )
            {
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                input_item_t *p_entry = NULL;
                char *psz_name = NULL;

                char * ppsz_options[2];
                int i_options = 0;

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                /* add a new entry */
                psz_parse+=8;
                if( !b_entry )
                {
                    msg_Err( p_demux, "end of entry without start?" );
                    continue;
                }
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                if( !psz_href )
                {
                    msg_Err( p_demux, "entry without href?" );
                    continue;
                }

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                if( p_sys->b_skip_ads && b_skip_entry )
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                {
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                    msg_Dbg( p_demux, "skipped entry %d %s (%s)",
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                    i_entry_count, ( psz_title_entry ? psz_title_entry : p_current_input->psz_name ), psz_href );
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                }
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                else
                {
                    if( i_starttime || i_duration )
                    {
                        if( i_starttime ) {
                            asprintf(ppsz_options+i_options, ":start-time=%d", i_starttime);
                            ++i_options;
                        }
                        if( i_duration ) {
                            asprintf(ppsz_options+i_options, ":stop-time=%d", i_starttime + i_duration);
                            ++i_options;
                        }
                    }
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                    /* create the new entry */
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                    asprintf( &psz_name, "%d %s", i_entry_count, ( psz_title_entry ? psz_title_entry : p_current_input->psz_name ) );
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                    p_entry = input_ItemNewExt( p_playlist, psz_href, psz_name, i_options, (const char * const *)ppsz_options, -1 );
                    FREENULL( psz_name );
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                    input_ItemCopyOptions( p_current_input, p_entry );
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                    while( i_options )
                    {
                        psz_name = ppsz_options[--i_options];
                        FREENULL(psz_name);
                    }

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                    if( psz_title_entry ) input_item_SetTitle( p_entry, psz_title_entry );
                    if( psz_artist_entry ) input_item_SetArtist( p_entry, psz_artist_entry );
                    if( psz_copyright_entry ) input_item_SetCopyright( p_entry, psz_copyright_entry );
                    if( psz_moreinfo_entry ) input_item_SetURL( p_entry, psz_moreinfo_entry );
                    if( psz_abstract_entry ) input_item_SetDescription( p_entry, psz_abstract_entry );
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                    input_ItemAddSubItem( p_current_input, p_entry );
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                }

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                /* cleanup entry */;
                FREENULL( psz_href );
                FREENULL( psz_title_entry );
                FREENULL( psz_base_entry );
                FREENULL( psz_artist_entry );
                FREENULL( psz_copyright_entry );
                FREENULL( psz_moreinfo_entry );
                FREENULL( psz_abstract_entry );
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                b_entry = VLC_FALSE;
            }
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            else if( !strncasecmp( psz_parse, "<Entry", 6 ) )
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            {
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                char *psz_clientskip;
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                psz_parse+=6;
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                if( b_entry )
                {
                    msg_Err( p_demux, "We already are in an entry section" );
                    continue;
                }
                i_entry_count += 1;
                b_entry = VLC_TRUE;
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                psz_clientskip = strcasestr( psz_parse, "clientskip=\"no\"" );
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                psz_parse = strcasestr( psz_parse, ">" );
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                /* If clientskip was enabled ... this is an ad */
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                b_skip_entry = (NULL != psz_clientskip) && (psz_clientskip < psz_parse);
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                // init entry details
                FREENULL(psz_href);
                psz_href = NULL;
                i_starttime = 0;
                i_duration = 0;
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            }
            else if( !strncasecmp( psz_parse, "<Ref ", 5 ) )
            {
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                psz_parse = SkipBlanks(psz_parse+5, (unsigned)-1);
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                if( !b_entry )
                {
                    msg_Err( p_demux, "A ref outside an entry section" );
                    continue;
                }
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                if( !strncasecmp( psz_parse, "HREF", 4 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
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                        psz_backup = SkipBlanks(psz_backup, (unsigned)-1);
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                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
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                            char *psz_tmp;
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                            i_strlen = psz_parse-psz_backup;
                            if( i_strlen < 1 ) continue;

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                            FREENULL(psz_href);
                            psz_href = malloc( i_strlen*sizeof( char ) +1);
                            memcpy( psz_href, psz_backup, i_strlen );
                            psz_href[i_strlen] = '\0';
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                            psz_tmp = psz_href + (i_strlen-1);
                            while( psz_tmp >= psz_href &&
                                 ( *psz_tmp == '\r' || *psz_tmp == '\n' ) )
                            {
                                *psz_tmp = '\0';
                                psz_tmp++;
                            }
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                        }
                        else continue;
                    }
                    else continue;
                }
                if( ( psz_parse = strcasestr( psz_parse, ">" ) ) )
                    psz_parse++;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<starttime ", 11 ) )
            {
                psz_parse = SkipBlanks(psz_parse+11, (unsigned)-1);
                if( !b_entry )
                {
                    msg_Err( p_demux, "starttime outside an entry section" );
                    continue;
                }

                if( !strncasecmp( psz_parse, "value", 5 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            i_strlen = psz_parse-psz_backup;
                            if( i_strlen < 1 ) continue;

                            i_starttime = ParseTime(psz_backup, i_strlen);
                        }
                        else continue;
                    }
                    else continue;
                }
                if( ( psz_parse = strcasestr( psz_parse, ">" ) ) )
                    psz_parse++;
                else continue;
            }
            else if( !strncasecmp( psz_parse, "<duration ", 11 ) )
            {
                psz_parse = SkipBlanks(psz_parse+5, (unsigned)-1);
                if( !b_entry )
                {
                    msg_Err( p_demux, "duration outside an entry section" );
                    continue;
                }

                if( !strncasecmp( psz_parse, "value", 5 ) )
                {
                    if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                    {
                        psz_backup = ++psz_parse;
                        if( ( psz_parse = strcasestr( psz_parse, "\"" ) ) )
                        {
                            i_strlen = psz_parse-psz_backup;
                            if( i_strlen < 1 ) continue;

                            i_duration = ParseTime(psz_backup, i_strlen);
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                        }
                        else continue;
                    }
                    else continue;
                }
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                if( ( psz_parse = strcasestr( psz_parse, ">" ) ) )
                    psz_parse++;
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                else continue;
            }
            else if( !strncasecmp( psz_parse, "</ASX", 5 ) )
            {
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                if( psz_title_asx ) input_item_SetTitle( p_current_input, psz_title_asx );
                if( psz_artist_asx ) input_item_SetArtist( p_current_input, psz_artist_asx );
                if( psz_copyright_asx ) input_item_SetCopyright( p_current_input, psz_copyright_asx );
                if( psz_moreinfo_asx ) input_item_SetURL( p_current_input, psz_moreinfo_asx );
                if( psz_abstract_asx ) input_item_SetDescription( p_current_input, psz_abstract_asx );
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                FREENULL( psz_base_asx );
                FREENULL( psz_title_asx );
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                FREENULL( psz_artist_asx );
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                FREENULL( psz_copyright_asx );
                FREENULL( psz_moreinfo_asx );
                FREENULL( psz_abstract_asx );
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                psz_parse++;
            }
            else psz_parse++;
        }
#if 0
/* FIXME Unsupported elements */
            PARAM
            EVENT
            REPEAT
            ENDMARK
            STARTMARK
#endif
    }
    HANDLE_PLAY_AND_RELEASE;
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    return -1; /* Needed for correct operation of go back */
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}

static int Control( demux_t *p_demux, int i_query, va_list args )
{
    return VLC_EGENERIC;
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}