+++ /dev/null
-/*****************************************************************************
- * langfromtelx.c: dynamic language setting from telx
- *****************************************************************************
- * Copyright © 2009-2011 VLC authors and VideoLAN
- * $Id$
- *
- * Authors: Christophe Massiot <massiot@via.ecp.fr>
- *
- * 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 <ctype.h>
-
-#include <vlc_common.h>
-#include <vlc_plugin.h>
-#include <vlc_sout.h>
-#include <vlc_block.h>
-
-/*****************************************************************************
- * Module descriptor
- *****************************************************************************/
-
-#define ID_TEXT N_("Elementary Stream ID")
-#define ID_LONGTEXT N_( \
- "Specify an identifier integer for this elementary stream to change" )
-#define MAGAZINE_TEXT N_("Magazine")
-#define MAGAZINE_LONGTEXT N_( \
- "Specify the magazine containing the language page" )
-#define PAGE_TEXT N_("Page")
-#define PAGE_LONGTEXT N_( \
- "Specify the page containing the language" )
-#define ROW_TEXT N_("Row")
-#define ROW_LONGTEXT N_( \
- "Specify the row containing the language" )
-
-static int Open ( vlc_object_t * );
-static void Close ( vlc_object_t * );
-
-#define SOUT_CFG_PREFIX "sout-langfromtelx-"
-
-vlc_module_begin()
- set_shortname( N_("Lang From Telx"))
- set_description( N_("Dynamic language setting from teletext"))
- set_capability( "sout stream", 50 )
- add_shortcut( "langfromtelx" )
- set_category( CAT_SOUT )
- set_subcategory( SUBCAT_SOUT_STREAM )
-
- set_callbacks( Open, Close )
- add_integer( SOUT_CFG_PREFIX "id", 0, ID_TEXT, ID_LONGTEXT,
- false )
- add_integer( SOUT_CFG_PREFIX "magazine", 7, MAGAZINE_TEXT,
- MAGAZINE_LONGTEXT, false )
- add_integer( SOUT_CFG_PREFIX "page", 0x99, PAGE_TEXT, PAGE_LONGTEXT,
- false )
- add_integer( SOUT_CFG_PREFIX "row", 1, ROW_TEXT, ROW_LONGTEXT,
- false )
-vlc_module_end();
-
-
-/*****************************************************************************
- * Local prototypes
- *****************************************************************************/
-static const char *ppsz_sout_options[] = {
- "id", "magazine", "page", "row", NULL
-};
-
-static sout_stream_id_sys_t *Add ( sout_stream_t *, es_format_t * );
-static void Del ( sout_stream_t *, sout_stream_id_sys_t * );
-static int Send ( sout_stream_t *, sout_stream_id_sys_t *, block_t * );
-
-struct sout_stream_sys_t
-{
- int i_id, i_magazine, i_page, i_row;
- char *psz_language, *psz_old_language;
- sout_stream_id_sys_t *p_id, *p_telx;
- int i_current_page;
-};
-
-/*****************************************************************************
- * Open:
- *****************************************************************************/
-static int Open( vlc_object_t *p_this )
-{
- sout_stream_t *p_stream = (sout_stream_t*)p_this;
- sout_stream_sys_t *p_sys;
-
- if( !p_stream->p_next )
- {
- msg_Err( p_stream, "cannot create chain" );
- return VLC_EGENERIC;
- }
-
- p_sys = malloc( sizeof( sout_stream_sys_t ) );
- if( unlikely( !p_sys ) )
- return VLC_ENOMEM;
-
- config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
- p_stream->p_cfg );
-
- p_sys->i_id = var_GetInteger( p_stream, SOUT_CFG_PREFIX "id" );
- p_sys->i_magazine = var_GetInteger( p_stream, SOUT_CFG_PREFIX "magazine" );
- p_sys->i_page = var_GetInteger( p_stream, SOUT_CFG_PREFIX "page" );
- p_sys->i_row = var_GetInteger( p_stream, SOUT_CFG_PREFIX "row" );
-
- p_stream->pf_add = Add;
- p_stream->pf_del = Del;
- p_stream->pf_send = Send;
-
- p_stream->p_sys = p_sys;
-
- return VLC_SUCCESS;
-}
-
-/*****************************************************************************
- * Close:
- *****************************************************************************/
-static void Close( vlc_object_t * p_this )
-{
- sout_stream_t *p_stream = (sout_stream_t*)p_this;
- sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
-
- free( p_sys->psz_old_language );
- free( p_sys );
-}
-
-static sout_stream_id_sys_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
-{
- sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
- sout_stream_id_sys_t *id;
- es_format_t fmt;
-
- if ( p_fmt->i_id == p_sys->i_id )
- {
- fmt = *p_fmt;
-
- p_sys->psz_old_language = p_fmt->psz_language;
- msg_Dbg( p_stream,
- "changing language of ID %d (magazine %d page %x row %d)",
- p_sys->i_id, p_sys->i_magazine, p_sys->i_page, p_sys->i_row );
- p_sys->psz_language = p_fmt->psz_language = malloc(4);
- if ( p_sys->psz_old_language != NULL )
- strncpy( p_fmt->psz_language, p_sys->psz_old_language, 3 );
- else
- strcpy( p_fmt->psz_language, "unk" );
- p_fmt->psz_language[3] = '\0';
- }
-
- id = sout_StreamIdAdd( p_stream->p_next, p_fmt );
-
- if( p_fmt->i_id == p_sys->i_id )
- p_sys->p_id = id;
- if( p_fmt->i_codec == VLC_CODEC_TELETEXT )
- p_sys->p_telx = id;
-
- return id;
-}
-
-static void Del( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
-{
- sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
-
- if ( id == p_sys->p_id ) p_sys->p_id = NULL;
- if ( id == p_sys->p_telx ) p_sys->p_telx = NULL;
-
- p_stream->p_next->pf_del( p_stream->p_next, id );
-}
-
-static void SetLanguage( sout_stream_t *p_stream, char *psz_language )
-{
- sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
-
- if ( strncmp( p_sys->psz_language, psz_language, 3 ) )
- msg_Dbg( p_stream, "changing language to %s", psz_language );
-
- strncpy( p_sys->psz_language, (const char *)psz_language, 3 );
-}
-
-/*****************************************************************************
- * Teletext stuff
- *****************************************************************************/
-static uint8_t bytereverse( int n )
-{
- n = (((n >> 1) & 0x55) | ((n << 1) & 0xaa));
- n = (((n >> 2) & 0x33) | ((n << 2) & 0xcc));
- n = (((n >> 4) & 0x0f) | ((n << 4) & 0xf0));
- return n;
-}
-
-static int hamming_8_4( int a )
-{
- switch (a) {
- case 0xA8:
- return 0;
- case 0x0B:
- return 1;
- case 0x26:
- return 2;
- case 0x85:
- return 3;
- case 0x92:
- return 4;
- case 0x31:
- return 5;
- case 0x1C:
- return 6;
- case 0xBF:
- return 7;
- case 0x40:
- return 8;
- case 0xE3:
- return 9;
- case 0xCE:
- return 10;
- case 0x6D:
- return 11;
- case 0x7A:
- return 12;
- case 0xD9:
- return 13;
- case 0xF4:
- return 14;
- case 0x57:
- return 15;
- default:
- return -1; // decoding error , not yet corrected
- }
-}
-
-static void decode_string( char *res, uint8_t *packet, int len )
-{
- for ( int i = 0; i < len; i++ )
- res[i] = bytereverse( packet[i] ) & 0x7f;
-
- res[len] = '\0';
-}
-
-static void HandleTelx( sout_stream_t *p_stream, block_t *p_block )
-{
- sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
- int len = p_block->i_buffer;
-
- for ( int offset = 1; offset + 46 <= len; offset += 46 )
- {
- uint8_t * packet = (uint8_t *) p_block->p_buffer+offset;
- if ( packet[0] == 0xFF )
- continue;
-
- int mpag = (hamming_8_4( packet[4] ) << 4) | hamming_8_4( packet[5] );
- int i_row, i_magazine;
- if ( mpag < 0 )
- {
- /* decode error */
- continue;
- }
-
- i_row = 0xFF & bytereverse(mpag);
- i_magazine = (7 & i_row) == 0 ? 8 : (7 & i_row);
- i_row >>= 3;
-
- if ( i_magazine != p_sys->i_magazine )
- continue;
-
- if ( i_row == 0 )
- {
- /* row 0 : flags and header line */
- p_sys->i_current_page =
- (0xF0 & bytereverse( hamming_8_4(packet[7]) )) |
- (0xF & (bytereverse( hamming_8_4(packet[6]) ) >> 4) );
- }
- if ( p_sys->i_current_page != p_sys->i_page ) continue;
- if ( i_row == p_sys->i_row )
- {
- /* row 1-23 : normal lines */
- char psz_line[41];
- decode_string( psz_line, packet + 6, 40 );
- psz_line[0] = tolower(psz_line[0]);
- psz_line[1] = tolower(psz_line[1]);
- psz_line[2] = tolower(psz_line[2]);
- psz_line[3] = '\0';
- SetLanguage( p_stream, psz_line );
- }
- }
-}
-
-/*****************************************************************************
- * Send:
- *****************************************************************************/
-static int Send( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
- block_t *p_buffer )
-{
- sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
-
- if ( id == p_sys->p_telx )
- HandleTelx( p_stream, p_buffer );
-
- return p_stream->p_next->pf_send( p_stream->p_next, id, p_buffer );
-}
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