Revert "wpl/ttml: use similar logic that subtitle_helper has for xml probing"

We can't use stream_Memory as xmlreader backend if we don't load the whole
file into memory, and that's not possible because we're probing.
(xmlread can't load incomplete documents)

This reverts commit 7ce48b0d.

modules/demux/playlist/wpl.c

@@ -186,22 +186,6 @@ int Import_WPL( vlc_object_t* p_this )
         Close_WPL( p_this );
         return VLC_EGENERIC;
     }
-    uint8_t *p_peek;
-    ssize_t i_peek = stream_Peek( p_demux->s, (const uint8_t **) &p_peek, 2048 );
-
-    if( unlikely( i_peek <= 0 ) )
-    {
-        Close_WPL( p_this );
-        return VLC_EGENERIC;
-    }
-
-    stream_t *p_probestream = stream_MemoryNew( p_demux->s, p_peek, i_peek, true );
-    if( unlikely( !p_probestream ) )
-    {
-        Close_WPL( p_this );
-        return VLC_EGENERIC;
-    }
-    p_sys->p_reader = xml_ReaderReset( p_sys->p_reader, p_probestream );
 
     const char* psz_name;
     int type = xml_ReaderNextNode( p_sys->p_reader, &psz_name );
@@ -209,11 +193,8 @@ int Import_WPL( vlc_object_t* p_this )
     {
         msg_Err( p_demux, "Invalid WPL playlist. Root element should have been <smil>" );
         Close_WPL( p_this );
-        stream_Delete( p_probestream );
         return VLC_EGENERIC;
     }
-    p_sys->p_reader = xml_ReaderReset( p_sys->p_reader, p_demux->s );
-    stream_Delete( p_probestream );
 
     msg_Dbg( p_demux, "Found valid WPL playlist" );
 

modules/demux/ttml.c

@@ -463,41 +463,17 @@ static int Open( vlc_object_t* p_this )
     if ( unlikely( p_sys == NULL ) )
         return VLC_ENOMEM;
 
-    i_peek = stream_Peek( p_demux->s, (const uint8_t **) &p_peek, 2048 );
-
-    if( unlikely( i_peek <= 0 ) )
-    {
-        Close( p_demux );
-        return VLC_EGENERIC;
-    }
-
-    stream_t *p_probestream = stream_MemoryNew( p_demux->s, p_peek, i_peek, true );
-    if( unlikely( !p_probestream ) )
-    {
-        Close( p_demux );
-        return VLC_EGENERIC;
-    }
-
     p_sys->p_xml = xml_Create( p_demux );
     if ( !p_sys->p_xml )
     {
         Close( p_demux );
-        stream_Delete( p_probestream );
-        return VLC_EGENERIC;
-    }
-    p_sys->p_reader = xml_ReaderCreate( p_sys->p_xml, p_demux->s );
-    if ( !p_sys->p_reader )
-    {
-        Close( p_demux );
-        stream_Delete( p_probestream );
         return VLC_EGENERIC;
     }
 
-    p_sys->p_reader = xml_ReaderReset( p_sys->p_reader, p_probestream );
+    p_sys->p_reader = xml_ReaderCreate( p_sys->p_xml, p_demux->s );
     if ( !p_sys->p_reader )
     {
         Close( p_demux );
-        stream_Delete( p_probestream );
         return VLC_EGENERIC;
     }
 
@@ -506,19 +482,8 @@ static int Open( vlc_object_t* p_this )
     if ( i_type != XML_READER_STARTELEM || ( strcmp( psz_name, "tt" ) && strcmp( psz_name, "tt:tt" ) ) )
     {
         Close( p_demux );
-        stream_Delete( p_probestream );
-        return VLC_EGENERIC;
-    }
-    p_sys->p_reader = xml_ReaderReset( p_sys->p_reader, p_demux->s );
-    if ( !p_sys->p_reader )
-    {
-        Close( p_demux );
-        stream_Delete( p_probestream );
         return VLC_EGENERIC;
     }
-    stream_Delete( p_probestream );
-
-
     if ( ReadTTML( p_demux ) != VLC_SUCCESS )
     {
         Close( p_demux );