m3u.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * m3u.c: a meta demux to parse pls, m3u, asx et b4s playlists
 *****************************************************************************
 * Copyright (C) 2001-2006 the VideoLAN team
 * $Id: m3u.c 15118 2006-04-06 17:54:21Z massiot $
 *
 * Authors: Sigmund Augdal Helberg <[e-mail]>
 *          Gildas Bazin <[e-mail]>
 *          Clément Stenac <[e-mail]>
 *
 * 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.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc_playlist.h>

/*****************************************************************************
 * Constants and structures
 *****************************************************************************/
#define MAX_LINE 8192

#define TYPE_UNKNOWN 0
#define TYPE_M3U 1
#define TYPE_ASX 2
#define TYPE_HTML 3
#define TYPE_PLS 4
#define TYPE_B4S 5
#define TYPE_WMP 6
#define TYPE_RTSP 7

struct demux_sys_t
{
    int i_type;                                   /* playlist type (m3u/asx) */
};

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Activate  ( vlc_object_t * );
static void Deactivate( vlc_object_t * );
static int  Demux     ( demux_t * );
static int  Control   ( demux_t *, int, va_list );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );
    set_description( _("Playlist metademux") );
    set_capability( "demux2", 5 );
    set_callbacks( Activate, Deactivate );
    add_shortcut( "m3u" );
    add_shortcut( "asx" );
    add_shortcut( "html" );
    add_shortcut( "pls" );
    add_shortcut( "b4s" );
vlc_module_end();

/*****************************************************************************
 * Activate: initializes m3u demux structures
 *****************************************************************************/
static int Activate( vlc_object_t * p_this )
{
    demux_t *p_demux = (demux_t *)p_this;
    char    *psz_ext;
    int     i_type  = TYPE_UNKNOWN;
    int     i_type2 = TYPE_UNKNOWN;

    p_demux->pf_control = Control;
    p_demux->pf_demux = Demux;

    /* Check for m3u/asx file extension or if the demux has been forced */
    psz_ext = strrchr ( p_demux->psz_path, '.' );

    if( ( psz_ext && !strcasecmp( psz_ext, ".m3u") ) ||
        /* a .ram file can contain a single rtsp link */
        ( psz_ext && !strcasecmp( psz_ext, ".ram") ) ||
        ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "m3u") ) )
    {
        i_type = TYPE_M3U;
    }
    else if( ( psz_ext && !strcasecmp( psz_ext, ".asx") ) ||
             ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "asx") ) )
    {
        i_type = TYPE_ASX;
    }
    else if( ( psz_ext && !strcasecmp( psz_ext, ".html") ) ||
             ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "html") ) )
    {
        i_type = TYPE_HTML;
    }
    else if( ( psz_ext && !strcasecmp( psz_ext, ".pls") ) ||
             ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "pls") ) )
    {
        i_type = TYPE_PLS;
    }
    else if( ( psz_ext && !strcasecmp( psz_ext, ".b4s") ) ||
             ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "b4s") ) )
    {
        i_type = TYPE_B4S;
    }

    /* we had no luck looking at the file extension, so we have a look
     * at the content. This is useful for .asp, .php and similar files
     * that are actually html. Also useful for some asx files that have
     * another extension */
    /* We double check for file != m3u as some asx are just m3u file */
    if( i_type != TYPE_M3U )
    {
        char *p_peek;
        int i_size = stream_Peek( p_demux->s, (uint8_t **)&p_peek, MAX_LINE );
        i_size -= sizeof("[Reference]") - 1;

        if( i_size > 0 )
        {
            while( i_size &&
                   strncasecmp(p_peek, "[playlist]", sizeof("[playlist]") - 1)
                   && strncasecmp( p_peek, "[Reference]", sizeof("[Reference]") - 1 )
                   && strncasecmp( p_peek, "<html>", sizeof("<html>") - 1 )
                   && strncasecmp( p_peek, "<asx", sizeof("<asx") - 1 )
                   && strncasecmp( p_peek, "rtsptext", sizeof("rtsptext") - 1 )
                   && strncasecmp( p_peek, "<?xml", sizeof("<?xml") -1 ) )
            {
                p_peek++;
                i_size--;
            }
            if( !i_size )
            {
                ;
            }
            else if( !strncasecmp( p_peek, "[playlist]", sizeof("[playlist]") -1 ) )
            {
                i_type2 = TYPE_PLS;
            }
            else if( !strncasecmp( p_peek, "[Reference]", sizeof("[Reference]") -1 ) )
            {
                i_type2 = TYPE_WMP;
            }
            else if( !strncasecmp( p_peek, "<html>", sizeof("<html>") -1 ) )
            {
                i_type2 = TYPE_HTML;
            }
            else if( !strncasecmp( p_peek, "<asx", sizeof("<asx") -1 ) )
            {
                i_type2 = TYPE_ASX;
            }
            else if( !strncasecmp( p_peek, "rtsptext", sizeof("rtsptext") -1 ) )
            {
                i_type2 = TYPE_RTSP;
            }
#if 0
            else if( !strncasecmp( p_peek, "<?xml", sizeof("<?xml") -1 ) )
            {
                i_type2 = TYPE_B4S;
            }
#endif
        }
    }
    if( i_type == TYPE_UNKNOWN && i_type2 == TYPE_UNKNOWN)
    {
        return VLC_EGENERIC;
    }
    if( i_type  != TYPE_UNKNOWN && i_type2 == TYPE_UNKNOWN )
    {
        i_type = TYPE_M3U;
    }
    else
    {
        i_type = i_type2;
    }

    /* Allocate p_m3u */
    p_demux->p_sys = malloc( sizeof( demux_sys_t ) );
    p_demux->p_sys->i_type = i_type;
    msg_Dbg( p_this, "playlist type: %d - %d", i_type, i_type2 );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Deactivate: frees unused data
 *****************************************************************************/
static void Deactivate( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t *)p_this;
    free( p_demux->p_sys );
}

/*****************************************************************************
 * XMLSpecialChars: Handle the special chars in a XML file.
 * ***************************************************************************/
static void XMLSpecialChars ( char *str )
{
    char *src = str;
    char *dst = str;

    while( *src )
    {
        if( *src == '&' )
        {
            /* FIXME:
             * - should probably accept any sequence, rather than only those
             *   commonly found in French.
             * - output may have to be UTF-8 encoded (cannot assume Latin-1)
             */
            if( !strncasecmp( src, "&#xe0;", 6 ) ) *dst++ = '\xe0';
            else if( !strncasecmp( src, "&#xee;", 6 ) ) *dst++ = '\xee';
            else if( !strncasecmp( src, "&apos;", 6 ) ) *dst++ = '\'';
            else if( !strncasecmp( src, "&#xe8;", 6 ) ) *dst++ = '\xe8';
            else if( !strncasecmp( src, "&#xe9;", 6 ) ) *dst++ = '\xe9';
            else if( !strncasecmp( src, "&#xea;", 6 ) ) *dst++ = '\xea';
            else
            {
                *dst++ = '?';
            }
            src += 6;
        }
        else
        {
            *dst++ = *src++;
        }
    }

    *dst = '\0';
}

/*****************************************************************************
 * ParseLine: read a "line" from the file and add any entries found
 * to the playlist. Returns:
 * 0 if nothing was found
 * 1 if a URI was found (it is then copied in psz_data)
 * 2 if a name was found (  "  )
 *
 * XXX psz_data has the same length that psz_line so no problem if you don't
 * expand it
 *    psz_line is \0 terminated
 *****************************************************************************/
static int ParseLine( demux_t *p_demux, char *psz_line, char *psz_data,
                      vlc_bool_t *pb_done )
{
    demux_sys_t *p_m3u = p_demux->p_sys;
    char        *psz_bol, *psz_name;

    psz_bol = psz_line;
    *pb_done = VLC_FALSE;

    /* Remove unnecessary tabs or spaces at the beginning of line */
    while( *psz_bol == ' ' || *psz_bol == '\t' ||
           *psz_bol == '\n' || *psz_bol == '\r' )
    {
        psz_bol++;
    }

    if( p_m3u->i_type == TYPE_M3U )
    {
        /* Check for comment line */
        if( *psz_bol == '#' )
        {
            while( *psz_bol &&
                   strncasecmp( psz_bol, "EXTINF:",
                                sizeof("EXTINF:") - 1 ) &&
                   strncasecmp( psz_bol, "EXTVLCOPT:",
                                sizeof("EXTVLCOPT:") - 1 ) ) psz_bol++;

            if( !*psz_bol ) return 0;

            if( !strncasecmp( psz_bol, "EXTINF:", sizeof("EXTINF:") - 1 ) )
            {
                psz_bol = strchr( psz_bol, ',' );
                if ( !psz_bol ) return 0;
                psz_bol++;

                /* From now, we have a name line */
                strcpy( psz_data , psz_bol );
                return 2;
            }
            else
            {
                psz_bol = strchr( psz_bol, ':' );
                if ( !psz_bol ) return 0;
                psz_bol++;

                strcpy( psz_data , psz_bol );
                return 3;
            }
        }
        /* If we don't have a comment, the line is directly the URI */
    }
    else if( p_m3u->i_type == TYPE_PLS )
    {
        /* We are dealing with .pls files from shoutcast
         * We are looking for lines like "File1=http://..." */
        if( !strncasecmp( psz_bol, "File", sizeof("File") - 1 ) )
        {
            psz_bol += sizeof("File") - 1;
            psz_bol = strchr( psz_bol, '=' );
            if ( !psz_bol ) return 0;
            psz_bol++;
        }
        else
        {
            return 0;
        }
    }
    else if( p_m3u->i_type == TYPE_WMP )
    {
        /* We are dealing with some weird WMP stream playlist format
         * Hurray for idiotic M$. Lines look like: "Ref1=http://..." */
        if( !strncasecmp( psz_bol, "Ref", sizeof("Ref") - 1 ) )
        {
            psz_bol += sizeof("Ref") - 1;
            psz_bol = strchr( psz_bol, '=' );
            if ( !psz_bol ) return 0;
            psz_bol++;
            if( !strncasecmp( psz_bol, "http://", sizeof("http://") -1 ) )
            {
                psz_bol++;
                psz_bol[0] = 'm'; psz_bol[1] = 'm'; psz_bol[2] = 's';
            }
        }
        else
        {
            return 0;
        }
    }
    else if( p_m3u->i_type == TYPE_ASX )
    {
        /* We are dealing with ASX files.
         * We are looking for "<ref href=" xml markups that
         * begins with "mms://", "http://" or "file://" */
        char *psz_eol;

        while( *psz_bol &&
               strncasecmp( psz_bol, "ref", sizeof("ref") - 1 ) )
            psz_bol++;

        if( !*psz_bol ) return 0;

        while( *psz_bol &&
               strncasecmp( psz_bol, "href", sizeof("href") - 1 ) )
            psz_bol++;

        if( !*psz_bol ) return 0;

        while( *psz_bol &&
               strncasecmp( psz_bol, "mms://",
                            sizeof("mms://") - 1 ) &&
               strncasecmp( psz_bol, "mmsu://",
                            sizeof("mmsu://") - 1 ) &&
               strncasecmp( psz_bol, "mmst://",
                            sizeof("mmst://") - 1 ) &&
               strncasecmp( psz_bol, "http://",
                            sizeof("http://") - 1 ) &&
               strncasecmp( psz_bol, "file://",
                            sizeof("file://") - 1 ) )
            psz_bol++;

        if( !*psz_bol ) return 0;

        psz_eol = strchr( psz_bol, '"');
        if( !psz_eol )
          return 0;

        *psz_eol = '\0';
    }
    else if( p_m3u->i_type == TYPE_HTML )
    {
        /* We are dealing with a html file with embedded
         * video.  We are looking for "<param name="filename"
         * value=" html markups that begin with "http://" */
        char *psz_eol;

        while( *psz_bol &&
               strncasecmp( psz_bol, "param", sizeof("param") - 1 ) )
            psz_bol++;

        if( !*psz_bol ) return 0;