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114 lines
3.9 KiB
114 lines
3.9 KiB
/*****************************************************************************
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* audio.c : mpeg audio Stream input module for vlc
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*****************************************************************************
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* Copyright (C) 2001 VideoLAN
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* $Id: id3.c,v 1.1 2002/08/24 21:35:31 sigmunau Exp $
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h>
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#include <vlc/vlc.h>
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#include <vlc/input.h>
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#include <sys/types.h>
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int SkipID3Tag ( vlc_object_t * );
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/* TODO: support MPEG-2.5, not difficult, but I need somes samples... */
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("Simple id3 tag skipper" ) );
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set_capability( "id3", 50 );
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set_callbacks( SkipID3Tag, NULL );
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vlc_module_end();
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/*****************************************************************************
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* Definitions of structures and functions used by this plugins
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*****************************************************************************/
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/****************************************************************************
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* ParseID3Tag : check if an ID3 header is present and parse and skip it
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****************************************************************************
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*
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* Author : Sigmund Augdal
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*
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' ****************************************************************************/
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static int SkipID3Tag( vlc_object_t *p_this )
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{
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input_thread_t *p_input;
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u8 *p_peek;
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int i_size;
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u8 version, revision;
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int b_footer;
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if ( p_this->i_object_type != VLC_OBJECT_INPUT )
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{
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return( VLC_EGENERIC );
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}
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p_input = (input_thread_t *)p_this;
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msg_Dbg( p_input, "Checking for ID3 tag" );
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/* get 10 byte id3 header */
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if( input_Peek( p_input, &p_peek, 10 ) < 10 )
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{
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msg_Err( p_input, "cannot peek()" );
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return( VLC_EGENERIC );
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}
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if ( !( (p_peek[0] == 0x49) && (p_peek[1] == 0x44) && (p_peek[2] == 0x33)))
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{
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return( VLC_SUCCESS );
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}
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version = p_peek[3]; /* These may become usfull later, */
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revision = p_peek[4]; /* but we ignore them for now */
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b_footer = p_peek[5] & 0x10;
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i_size = (p_peek[6] << 21) +
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(p_peek[7] << 14) +
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(p_peek[8] << 7) +
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p_peek[9];
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if ( b_footer )
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{
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i_size += 10;
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}
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i_size += 10;
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/* peek the entire tag */
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if ( input_Peek( p_input, &p_peek, i_size ) < i_size )
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{
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msg_Err( p_input, "cannot peek()" );
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return( VLC_EGENERIC );
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}
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msg_Dbg( p_input, "ID3 tag found, skiping %d bytes", i_size );
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p_input->p_current_data += i_size; /* seek passed end of ID3 tag */
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return ( VLC_SUCCESS );
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}
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