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https://code.videolan.org/videolan/vlc
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518 lines
17 KiB
C
518 lines
17 KiB
C
/*****************************************************************************
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* zvbi.c : VBI and Teletext PES demux and decoder using libzvbi
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*****************************************************************************
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* Copyright (C) 2007, M2X
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* $Id$
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*
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* Authors: Derk-Jan Hartman <djhartman at m2x dot nl>
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* Jean-Paul Saman <jpsaman at m2x dot nl>
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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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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*
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* information on teletext format can be found here :
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* http://pdc.ro.nu/teletext.html
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*
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*****************************************************************************/
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/* This module implements:
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* ETSI EN 301 775: VBI data in PES
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* ETSI EN 300 472: EBU Teletext data in PES
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* ETSI EN 300 706: Enhanced Teletext (libzvbi)
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* ETSI EN 300 231: Video Programme System [VPS] (libzvbi)
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* ETSI EN 300 294: 625-line Wide Screen Signaling [WSS] (libzvbi)
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* EIA-608 Revision A: Closed Captioning [CC] (libzvbi)
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <assert.h>
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#include <libzvbi.h>
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#include "vlc_vout.h"
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#include "vlc_codec.h"
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/*****************************************************************************
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* Module descriptor.
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close( vlc_object_t * );
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#define PAGE_TEXT N_("Teletext page")
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#define PAGE_LONGTEXT N_("Open the indicated Teletext page." \
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"Default page is index 100")
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#define OPAQUE_TEXT N_("Text is always opaque")
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#define OPAQUE_LONGTEXT N_("Setting vbi-opaque to false " \
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"makes the boxed text transparent." )
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#define POS_TEXT N_("Teletext alignment")
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#define POS_LONGTEXT N_( \
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"You can enforce the teletext position on the video " \
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"(0=center, 1=left, 2=right, 4=top, 8=bottom, you can " \
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"also use combinations of these values, eg. 6 = top-right).")
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#define TELX_TEXT N_("Teletext text subtitles")
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#define TELX_LONGTEXT N_( "Output teletext subtitles as text " \
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"instead of as RGBA" )
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static const int pi_pos_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
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static const char *const ppsz_pos_descriptions[] =
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{ N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
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N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
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vlc_module_begin();
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set_description( N_("VBI and Teletext decoder") );
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set_shortname( N_("VBI & Teletext") );
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set_capability( "decoder", 51 );
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_SCODEC );
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set_callbacks( Open, Close );
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add_integer( "vbi-page", 100, NULL,
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PAGE_TEXT, PAGE_LONGTEXT, false );
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add_bool( "vbi-opaque", true, NULL,
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OPAQUE_TEXT, OPAQUE_LONGTEXT, false );
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add_integer( "vbi-position", 4, NULL, POS_TEXT, POS_LONGTEXT, false );
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change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
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add_bool( "vbi-text", false, NULL,
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TELX_TEXT, TELX_LONGTEXT, false );
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vlc_module_end();
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/****************************************************************************
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* Local structures
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****************************************************************************/
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// #define ZVBI_DEBUG
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typedef enum {
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DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE = 0x02,
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DATA_UNIT_EBU_TELETEXT_SUBTITLE = 0x03,
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DATA_UNIT_EBU_TELETEXT_INVERTED = 0x0C,
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DATA_UNIT_ZVBI_WSS_CPR1204 = 0xB4,
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DATA_UNIT_ZVBI_CLOSED_CAPTION_525 = 0xB5,
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DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525 = 0xB6,
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DATA_UNIT_VPS = 0xC3,
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DATA_UNIT_WSS = 0xC4,
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DATA_UNIT_CLOSED_CAPTION = 0xC5,
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DATA_UNIT_MONOCHROME_SAMPLES = 0xC6,
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DATA_UNIT_STUFFING = 0xFF,
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} data_unit_id;
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struct decoder_sys_t
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{
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vbi_decoder * p_vbi_dec;
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vbi_dvb_demux * p_dvb_demux;
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unsigned int i_last_page;
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bool b_update;
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bool b_text; /* Subtitles as text */
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vlc_mutex_t lock; /* Lock to protect the following variables */
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/* Positioning of Teletext images */
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int i_align;
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/* */
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unsigned int i_wanted_page;
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/* */
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bool b_opaque;
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};
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static subpicture_t *Decode( decoder_t *, block_t ** );
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static void EventHandler( vbi_event *ev, void *user_data );
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static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
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vlc_value_t oldval, vlc_value_t newval, void *p_data );
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static int OpaquePage( decoder_t *p_dec, vbi_page p_page, video_format_t fmt,
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picture_t *p_src, bool b_opaque );
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static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
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vlc_value_t oldval, vlc_value_t newval, void *p_data );
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static int Position( vlc_object_t *p_this, char const *psz_cmd,
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vlc_value_t oldval, vlc_value_t newval, void *p_data );
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/*****************************************************************************
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* Open: probe the decoder and return score
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*****************************************************************************
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* Tries to launch a decoder and return score so that the interface is able
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* to chose.
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t *) p_this;
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decoder_sys_t *p_sys = NULL;
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if( p_dec->fmt_in.i_codec != VLC_FOURCC('t','e','l','x') )
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return VLC_EGENERIC;
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p_dec->pf_decode_sub = Decode;
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p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
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if( p_sys == NULL )
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return VLC_ENOMEM;
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memset( p_sys, 0, sizeof(decoder_sys_t) );
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p_sys->b_update = false;
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p_sys->p_vbi_dec = vbi_decoder_new();
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p_sys->p_dvb_demux = vbi_dvb_pes_demux_new( NULL, NULL );
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vlc_mutex_init( &p_sys->lock );
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if( (p_sys->p_vbi_dec == NULL) || (p_sys->p_dvb_demux == NULL) )
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{
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msg_Err( p_dec, "VBI decoder/demux could not be created." );
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Close( p_this );
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return VLC_ENOMEM;
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}
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vbi_event_handler_register( p_sys->p_vbi_dec, VBI_EVENT_TTX_PAGE |
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VBI_EVENT_CAPTION | VBI_EVENT_NETWORK |
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VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO,
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EventHandler, p_dec );
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/* Create the var on vlc_global. */
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p_sys->i_wanted_page = var_CreateGetInteger( p_dec, "vbi-page" );
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var_AddCallback( p_dec, "vbi-page",
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RequestPage, p_sys );
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p_sys->b_opaque = var_CreateGetBool( p_dec, "vbi-opaque" );
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var_AddCallback( p_dec, "vbi-opaque", Opaque, p_sys );
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p_sys->i_align = var_CreateGetInteger( p_dec, "vbi-position" );
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var_AddCallback( p_dec, "vbi-position", Position, p_sys );
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p_sys->b_text = var_CreateGetBool( p_dec, "vbi-text" );
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// var_AddCallback( p_dec, "vbi-text", Text, p_sys );
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es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
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if( p_sys->b_text )
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p_dec->fmt_out.video.i_chroma = VLC_FOURCC('T','E','X','T');
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else
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p_dec->fmt_out.video.i_chroma = VLC_FOURCC('R','G','B','A');
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Close:
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*****************************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*) p_this;
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decoder_sys_t *p_sys = p_dec->p_sys;
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var_DelCallback( p_dec, "vbi-position", Position, p_sys );
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var_DelCallback( p_dec, "vbi-opaque", Opaque, p_sys );
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var_DelCallback( p_dec, "vbi-page", RequestPage, p_sys );
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vlc_mutex_destroy( &p_sys->lock );
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if( p_sys->p_vbi_dec )
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vbi_decoder_delete( p_sys->p_vbi_dec );
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if( p_sys->p_dvb_demux )
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vbi_dvb_demux_delete( p_sys->p_dvb_demux );
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free( p_sys );
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}
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#define MAX_SLICES 32
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#ifdef WORDS_BIGENDIAN
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# define ZVBI_PIXFMT_RGBA32 VBI_PIXFMT_RGBA32_BE
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#else
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# define ZVBI_PIXFMT_RGBA32 VBI_PIXFMT_RGBA32_LE
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#endif
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/*****************************************************************************
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* Decode:
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*****************************************************************************/
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static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = (decoder_sys_t *) p_dec->p_sys;
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block_t *p_block;
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subpicture_t *p_spu = NULL;
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video_format_t fmt;
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bool b_cached = false;
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vbi_page p_page;
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const uint8_t *p_pos;
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unsigned int i_left;
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if( (pp_block == NULL) || (*pp_block == NULL) )
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return NULL;
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p_block = *pp_block;
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*pp_block = NULL;
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p_pos = p_block->p_buffer;
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i_left = p_block->i_buffer;
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while( i_left > 0 )
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{
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vbi_sliced p_sliced[MAX_SLICES];
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unsigned int i_lines = 0;
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int64_t i_pts;
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i_lines = vbi_dvb_demux_cor( p_sys->p_dvb_demux, p_sliced,
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MAX_SLICES, &i_pts, &p_pos, &i_left );
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if( i_lines > 0 )
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vbi_decode( p_sys->p_vbi_dec, p_sliced, i_lines, i_pts / 90000.0 );
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}
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/* */
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vlc_mutex_lock( &p_sys->lock );
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const int i_align = p_sys->i_align;
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const unsigned int i_wanted_page = p_sys->i_wanted_page;
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const bool b_opaque = p_sys->b_opaque;
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vlc_mutex_unlock( &p_sys->lock );
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/* Try to see if the page we want is in the cache yet */
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b_cached = vbi_fetch_vt_page( p_sys->p_vbi_dec, &p_page,
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vbi_dec2bcd( i_wanted_page ),
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VBI_ANY_SUBNO, VBI_WST_LEVEL_3p5,
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25, FALSE );
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if( !b_cached )
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goto error;
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if( ( i_wanted_page == p_sys->i_last_page ) &&
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( p_sys->b_update != true ) )
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goto error;
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p_sys->b_update = false;
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p_sys->i_last_page = i_wanted_page;
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#ifdef ZVBI_DEBUG
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msg_Dbg( p_dec, "we now have page: %d ready for display",
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i_wanted_page );
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#endif
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/* If there is a page or sub to render, then we do that here */
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/* Create the subpicture unit */
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p_spu = p_dec->pf_spu_buffer_new( p_dec );
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if( !p_spu )
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{
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msg_Warn( p_dec, "can't get spu buffer" );
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goto error;
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}
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/* Create a new subpicture region */
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memset( &fmt, 0, sizeof(video_format_t) );
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fmt.i_chroma = p_sys->b_text ? VLC_FOURCC('T','E','X','T') :
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VLC_FOURCC('R','G','B','A');
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fmt.i_aspect = p_sys->b_text ? 0 : VOUT_ASPECT_FACTOR;
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if( p_sys->b_text )
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{
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fmt.i_bits_per_pixel = 0;
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}
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else
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{
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fmt.i_sar_num = fmt.i_sar_den = 1;
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fmt.i_width = fmt.i_visible_width = p_page.columns * 12;
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fmt.i_height = fmt.i_visible_height = p_page.rows * 10;
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fmt.i_bits_per_pixel = 32;
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}
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fmt.i_x_offset = fmt.i_y_offset = 0;
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p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
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if( p_spu->p_region == NULL )
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{
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msg_Err( p_dec, "cannot allocate SPU region" );
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goto error;
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}
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p_spu->p_region->i_x = 0;
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p_spu->p_region->i_y = 0;
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p_spu->p_region->i_align = i_align;
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/* Normal text subs, easy markup */
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p_spu->i_flags = SUBPICTURE_ALIGN_BOTTOM;
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p_spu->i_start = (mtime_t) p_block->i_pts;
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p_spu->i_stop = (mtime_t) 0;
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p_spu->b_ephemer = true;
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p_spu->b_absolute = false;
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p_spu->b_pausable = true;
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if( p_sys->b_text )
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{
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unsigned int i_textsize = 7000;
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int i_total;
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char p_text[7000];
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i_total = vbi_print_page_region( &p_page, p_text, i_textsize,
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"UTF-8", 0, 0, 0, 0, p_page.columns, p_page.rows );
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p_text[i_total] = '\0';
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/* Strip off the pagenumber */
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if( i_total <= 40 )
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goto error;
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p_spu->p_region->psz_text = strdup( &p_text[8] );
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#ifdef ZVBI_DEBUG
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msg_Info( p_dec, "page %x-%x(%d)\n%s", p_page.pgno, p_page.subno, i_total, p_text );
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#endif
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}
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else
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{
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picture_t *p_pic = &p_spu->p_region->picture;
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/* ZVBI is stupid enough to assume pitch == width */
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p_pic->p->i_pitch = 4 * fmt.i_width;
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vbi_draw_vt_page( &p_page, ZVBI_PIXFMT_RGBA32,
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p_spu->p_region->picture.p->p_pixels, 1, 1 );
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OpaquePage( p_dec, p_page, fmt, &p_spu->p_region->picture, b_opaque );
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/* */
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p_spu->i_width =
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p_spu->i_original_picture_width = fmt.i_width;
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p_spu->i_height =
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p_spu->i_original_picture_height = fmt.i_height;
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}
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vbi_unref_page( &p_page );
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block_Release( p_block );
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return p_spu;
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error:
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vbi_unref_page( &p_page );
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if( p_spu != NULL )
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{
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p_dec->pf_spu_buffer_del( p_dec, p_spu );
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p_spu = NULL;
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}
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block_Release( p_block );
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return NULL;
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}
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static void EventHandler( vbi_event *ev, void *user_data )
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{
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decoder_t *p_dec = (decoder_t *)user_data;
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decoder_sys_t *p_sys = p_dec->p_sys;
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if( ev->type == VBI_EVENT_TTX_PAGE )
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{
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#ifdef ZVBI_DEBUG
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msg_Info( p_dec, "Page %03x.%02x ",
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ev->ev.ttx_page.pgno,
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ev->ev.ttx_page.subno & 0xFF);
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#endif
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if( p_sys->i_last_page == vbi_bcd2dec( ev->ev.ttx_page.pgno ) )
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p_sys->b_update = true;
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if( ev->ev.ttx_page.clock_update )
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msg_Dbg( p_dec, "clock" );
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#ifdef ZVBI_DEBUG
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if( ev->ev.ttx_page.header_update )
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msg_Dbg( p_dec, "header" );
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#endif
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}
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else if( ev->type == VBI_EVENT_CAPTION )
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msg_Dbg( p_dec, "Caption line: %x", ev->ev.caption.pgno );
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else if( ev->type == VBI_EVENT_NETWORK )
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msg_Dbg( p_dec, "Network change" );
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else if( ev->type == VBI_EVENT_ASPECT )
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msg_Dbg( p_dec, "Aspect update" );
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else if( ev->type == VBI_EVENT_NETWORK )
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msg_Dbg( p_dec, "Program info received" );
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}
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static int OpaquePage( decoder_t *p_dec, vbi_page p_page,
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video_format_t fmt, picture_t *p_src, bool b_opaque )
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{
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decoder_sys_t *p_sys = (decoder_sys_t *) p_dec->p_sys;
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unsigned int x, y;
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assert( fmt.i_chroma == VLC_FOURCC('R','G','B','A' ) );
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/* Kludge since zvbi doesn't provide an option to specify opacity. */
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for( y = 0; y < fmt.i_height; y++ )
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{
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for( x = 0; x < fmt.i_width; x++ )
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{
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const vbi_opacity opacity = p_page.text[ y/10 * p_page.columns + x/12 ].opacity;
|
|
uint32_t *p_pixel = (uint32_t*)&p_src->p->p_pixels[y * p_src->p->i_pitch + 4*x];
|
|
switch( opacity )
|
|
{
|
|
/* Show video instead of this character */
|
|
case VBI_TRANSPARENT_SPACE:
|
|
*p_pixel = 0;
|
|
break;
|
|
/* To make the boxed text "closed captioning" transparent
|
|
* change true to false.
|
|
*/
|
|
case VBI_OPAQUE:
|
|
if( b_opaque )
|
|
break;
|
|
/* Full text transparency. only foreground color is show */
|
|
case VBI_TRANSPARENT_FULL:
|
|
*p_pixel = 0;
|
|
break;
|
|
/* Transparency for boxed text */
|
|
case VBI_SEMI_TRANSPARENT:
|
|
if( (*p_pixel & 0xffffff00) == 0xff ) /* FIXME cannot be true ? */
|
|
*p_pixel = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* end of kludge */
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/* Callbacks */
|
|
static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
|
|
vlc_value_t oldval, vlc_value_t newval, void *p_data )
|
|
{
|
|
decoder_sys_t *p_sys = p_data;
|
|
VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
|
|
|
|
vlc_mutex_lock( &p_sys->lock );
|
|
if( newval.i_int > 0 && newval.i_int < 999 )
|
|
p_sys->i_wanted_page = newval.i_int;
|
|
vlc_mutex_unlock( &p_sys->lock );
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
|
|
vlc_value_t oldval, vlc_value_t newval, void *p_data )
|
|
{
|
|
decoder_sys_t *p_sys = p_data;
|
|
VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
|
|
|
|
vlc_mutex_lock( &p_sys->lock );
|
|
p_sys->b_opaque = newval.b_bool;
|
|
vlc_mutex_unlock( &p_sys->lock );
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int Position( vlc_object_t *p_this, char const *psz_cmd,
|
|
vlc_value_t oldval, vlc_value_t newval, void *p_data )
|
|
{
|
|
decoder_sys_t *p_sys = p_data;
|
|
VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
|
|
|
|
vlc_mutex_lock( &p_sys->lock );
|
|
p_sys->i_align = newval.i_int;
|
|
vlc_mutex_unlock( &p_sys->lock );
|
|
|
|
return VLC_SUCCESS;
|
|
}
|