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vlc/modules/codec/zvbi.c

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/*****************************************************************************
* zvbi.c : VBI and Teletext PES demux and decoder using libzvbi
*****************************************************************************
* Copyright (C) 2007, M2X
* $Id$
*
* Authors: Derk-Jan Hartman <djhartman at m2x dot nl>
* Jean-Paul Saman <jpsaman at m2x dot nl>
*
* 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.
*****************************************************************************/
/*****************************************************************************
*
* information on teletext format can be found here :
* http://pdc.ro.nu/teletext.html
*
*****************************************************************************/
/* This module implements:
* ETSI EN 301 775: VBI data in PES
* ETSI EN 300 472: EBU Teletext data in PES
* ETSI EN 300 706: Enhanced Teletext (libzvbi)
* ETSI EN 300 231: Video Programme System [VPS] (libzvbi)
* ETSI EN 300 294: 625-line Wide Screen Signaling [WSS] (libzvbi)
* EIA-608 Revision A: Closed Captioning [CC] (libzvbi)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <assert.h>
#include <libzvbi.h>
#include "vlc_vout.h"
#include "vlc_codec.h"
/*****************************************************************************
* Module descriptor.
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
#define PAGE_TEXT N_("Teletext page")
#define PAGE_LONGTEXT N_("Open the indicated Teletext page." \
"Default page is index 100")
#define OPAQUE_TEXT N_("Text is always opaque")
#define OPAQUE_LONGTEXT N_("Setting vbi-opaque to false " \
"makes the boxed text transparent." )
#define POS_TEXT N_("Teletext alignment")
#define POS_LONGTEXT N_( \
"You can enforce the teletext position on the video " \
"(0=center, 1=left, 2=right, 4=top, 8=bottom, you can " \
"also use combinations of these values, eg. 6 = top-right).")
#define TELX_TEXT N_("Teletext text subtitles")
#define TELX_LONGTEXT N_( "Output teletext subtitles as text " \
"instead of as RGBA" )
static const int pi_pos_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
static const char *const ppsz_pos_descriptions[] =
{ N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
vlc_module_begin();
set_description( N_("VBI and Teletext decoder") );
set_shortname( N_("VBI & Teletext") );
set_capability( "decoder", 51 );
set_category( CAT_INPUT );
set_subcategory( SUBCAT_INPUT_SCODEC );
set_callbacks( Open, Close );
add_integer( "vbi-page", 100, NULL,
PAGE_TEXT, PAGE_LONGTEXT, false );
add_bool( "vbi-opaque", true, NULL,
OPAQUE_TEXT, OPAQUE_LONGTEXT, false );
add_integer( "vbi-position", 4, NULL, POS_TEXT, POS_LONGTEXT, false );
change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
add_bool( "vbi-text", false, NULL,
TELX_TEXT, TELX_LONGTEXT, false );
vlc_module_end();
/****************************************************************************
* Local structures
****************************************************************************/
// #define ZVBI_DEBUG
typedef enum {
DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE = 0x02,
DATA_UNIT_EBU_TELETEXT_SUBTITLE = 0x03,
DATA_UNIT_EBU_TELETEXT_INVERTED = 0x0C,
DATA_UNIT_ZVBI_WSS_CPR1204 = 0xB4,
DATA_UNIT_ZVBI_CLOSED_CAPTION_525 = 0xB5,
DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525 = 0xB6,
DATA_UNIT_VPS = 0xC3,
DATA_UNIT_WSS = 0xC4,
DATA_UNIT_CLOSED_CAPTION = 0xC5,
DATA_UNIT_MONOCHROME_SAMPLES = 0xC6,
DATA_UNIT_STUFFING = 0xFF,
} data_unit_id;
struct decoder_sys_t
{
vbi_decoder * p_vbi_dec;
vbi_dvb_demux * p_dvb_demux;
unsigned int i_last_page;
bool b_update;
bool b_text; /* Subtitles as text */
vlc_mutex_t lock; /* Lock to protect the following variables */
/* Positioning of Teletext images */
int i_align;
/* */
unsigned int i_wanted_page;
/* */
bool b_opaque;
};
static subpicture_t *Decode( decoder_t *, block_t ** );
static subpicture_t *Subpicture( decoder_t *p_dec, video_format_t *p_fmt,
bool b_text,
int i_columns, int i_rows,
int i_align, mtime_t i_pts );
static void EventHandler( vbi_event *ev, void *user_data );
static int OpaquePage( picture_t *p_src, const vbi_page p_page,
const video_format_t fmt, bool b_opaque );
/* Properties callbacks */
static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
vlc_value_t oldval, vlc_value_t newval, void *p_data );
static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
vlc_value_t oldval, vlc_value_t newval, void *p_data );
static int Position( vlc_object_t *p_this, char const *psz_cmd,
vlc_value_t oldval, vlc_value_t newval, void *p_data );
/*****************************************************************************
* Open: probe the decoder and return score
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to chose.
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t *) p_this;
decoder_sys_t *p_sys = NULL;
if( p_dec->fmt_in.i_codec != VLC_FOURCC('t','e','l','x') )
return VLC_EGENERIC;
p_dec->pf_decode_sub = Decode;
p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
if( p_sys == NULL )
return VLC_ENOMEM;
memset( p_sys, 0, sizeof(decoder_sys_t) );
p_sys->b_update = false;
p_sys->p_vbi_dec = vbi_decoder_new();
p_sys->p_dvb_demux = vbi_dvb_pes_demux_new( NULL, NULL );
vlc_mutex_init( &p_sys->lock );
if( (p_sys->p_vbi_dec == NULL) || (p_sys->p_dvb_demux == NULL) )
{
msg_Err( p_dec, "VBI decoder/demux could not be created." );
Close( p_this );
return VLC_ENOMEM;
}
vbi_event_handler_register( p_sys->p_vbi_dec, VBI_EVENT_TTX_PAGE |
VBI_EVENT_CAPTION | VBI_EVENT_NETWORK |
VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO,
EventHandler, p_dec );
/* Create the var on vlc_global. */
p_sys->i_wanted_page = var_CreateGetInteger( p_dec, "vbi-page" );
var_AddCallback( p_dec, "vbi-page",
RequestPage, p_sys );
p_sys->b_opaque = var_CreateGetBool( p_dec, "vbi-opaque" );
var_AddCallback( p_dec, "vbi-opaque", Opaque, p_sys );
p_sys->i_align = var_CreateGetInteger( p_dec, "vbi-position" );
var_AddCallback( p_dec, "vbi-position", Position, p_sys );
p_sys->b_text = var_CreateGetBool( p_dec, "vbi-text" );
// var_AddCallback( p_dec, "vbi-text", Text, p_sys );
es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
if( p_sys->b_text )
p_dec->fmt_out.video.i_chroma = VLC_FOURCC('T','E','X','T');
else
p_dec->fmt_out.video.i_chroma = VLC_FOURCC('R','G','B','A');
return VLC_SUCCESS;
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*) p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
var_DelCallback( p_dec, "vbi-position", Position, p_sys );
var_DelCallback( p_dec, "vbi-opaque", Opaque, p_sys );
var_DelCallback( p_dec, "vbi-page", RequestPage, p_sys );
vlc_mutex_destroy( &p_sys->lock );
if( p_sys->p_vbi_dec )
vbi_decoder_delete( p_sys->p_vbi_dec );
if( p_sys->p_dvb_demux )
vbi_dvb_demux_delete( p_sys->p_dvb_demux );
free( p_sys );
}
#define MAX_SLICES 32
#ifdef WORDS_BIGENDIAN
# define ZVBI_PIXFMT_RGBA32 VBI_PIXFMT_RGBA32_BE
#else
# define ZVBI_PIXFMT_RGBA32 VBI_PIXFMT_RGBA32_LE
#endif
/*****************************************************************************
* Decode:
*****************************************************************************/
static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
subpicture_t *p_spu = NULL;
video_format_t fmt;
bool b_cached = false;
vbi_page p_page;
const uint8_t *p_pos;
unsigned int i_left;
if( (pp_block == NULL) || (*pp_block == NULL) )
return NULL;
p_block = *pp_block;
*pp_block = NULL;
p_pos = p_block->p_buffer;
i_left = p_block->i_buffer;
while( i_left > 0 )
{
vbi_sliced p_sliced[MAX_SLICES];
unsigned int i_lines = 0;
int64_t i_pts;
i_lines = vbi_dvb_demux_cor( p_sys->p_dvb_demux, p_sliced,
MAX_SLICES, &i_pts, &p_pos, &i_left );
if( i_lines > 0 )
vbi_decode( p_sys->p_vbi_dec, p_sliced, i_lines, i_pts / 90000.0 );
}
/* */
vlc_mutex_lock( &p_sys->lock );
const int i_align = p_sys->i_align;
const unsigned int i_wanted_page = p_sys->i_wanted_page;
const bool b_opaque = p_sys->b_opaque;
vlc_mutex_unlock( &p_sys->lock );
/* Try to see if the page we want is in the cache yet */
b_cached = vbi_fetch_vt_page( p_sys->p_vbi_dec, &p_page,
vbi_dec2bcd( i_wanted_page ),
VBI_ANY_SUBNO, VBI_WST_LEVEL_3p5,
25, FALSE );
if( i_wanted_page == p_sys->i_last_page && !p_sys->b_update )
goto error;
if( !b_cached )
{
if( p_sys->i_last_page != i_wanted_page )
{
/* We need to reset the subtitle */
p_spu = Subpicture( p_dec, &fmt, true,
p_page.columns, p_page.rows,
i_align, p_block->i_pts );
if( !p_spu )
goto error;
p_spu->p_region->psz_text = strdup("");
p_sys->b_update = true;
p_sys->i_last_page = i_wanted_page;
goto exit;
}
goto error;
}
p_sys->b_update = false;
p_sys->i_last_page = i_wanted_page;
#ifdef ZVBI_DEBUG
msg_Dbg( p_dec, "we now have page: %d ready for display",
i_wanted_page );
#endif
/* If there is a page or sub to render, then we do that here */
/* Create the subpicture unit */
p_spu = Subpicture( p_dec, &fmt, p_sys->b_text,
p_page.columns, p_page.rows,
i_align, p_block->i_pts );
if( !p_spu )
goto error;
if( p_sys->b_text )
{
unsigned int i_textsize = 7000;
int i_total;
char p_text[i_textsize+1];
i_total = vbi_print_page_region( &p_page, p_text, i_textsize,
"UTF-8", 0, 0, 0, 0, p_page.columns, p_page.rows );
p_text[i_total] = '\0';
/* Strip off the pagenumber */
if( i_total <= 40 )
goto error;
p_spu->p_region->psz_text = strdup( &p_text[8] );
#ifdef ZVBI_DEBUG
msg_Info( p_dec, "page %x-%x(%d)\n%s", p_page.pgno, p_page.subno, i_total, p_text );
#endif
}
else
{
picture_t *p_pic = &p_spu->p_region->picture;
/* ZVBI is stupid enough to assume pitch == width */
p_pic->p->i_pitch = 4 * fmt.i_width;
vbi_draw_vt_page( &p_page, ZVBI_PIXFMT_RGBA32,
p_spu->p_region->picture.p->p_pixels, 1, 1 );
OpaquePage( p_pic, p_page, fmt, b_opaque );
}
exit:
vbi_unref_page( &p_page );
block_Release( p_block );
return p_spu;
error:
vbi_unref_page( &p_page );
if( p_spu != NULL )
{
p_dec->pf_spu_buffer_del( p_dec, p_spu );
p_spu = NULL;
}
block_Release( p_block );
return NULL;
}
static subpicture_t *Subpicture( decoder_t *p_dec, video_format_t *p_fmt,
bool b_text,
int i_columns, int i_rows, int i_align,
mtime_t i_pts )
{
video_format_t fmt;
subpicture_t *p_spu;
/* If there is a page or sub to render, then we do that here */
/* Create the subpicture unit */
p_spu = p_dec->pf_spu_buffer_new( p_dec );
if( !p_spu )
{
msg_Warn( p_dec, "can't get spu buffer" );
return NULL;
}
memset( &fmt, 0, sizeof(video_format_t) );
fmt.i_chroma = b_text ? VLC_FOURCC('T','E','X','T') :
VLC_FOURCC('R','G','B','A');
fmt.i_aspect = b_text ? 0 : VOUT_ASPECT_FACTOR;
if( b_text )
{
fmt.i_bits_per_pixel = 0;
}
else
{
fmt.i_sar_num = fmt.i_sar_den = 1;
fmt.i_width = fmt.i_visible_width = i_columns * 12;
fmt.i_height = fmt.i_visible_height = i_rows * 10;
fmt.i_bits_per_pixel = 32;
}
fmt.i_x_offset = fmt.i_y_offset = 0;
p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
if( p_spu->p_region == NULL )
{
msg_Err( p_dec, "cannot allocate SPU region" );
p_dec->pf_spu_buffer_del( p_dec, p_spu );
return NULL;
}
p_spu->p_region->i_x = 0;
p_spu->p_region->i_y = 0;
p_spu->p_region->i_align = i_align;
/* Normal text subs, easy markup */
p_spu->i_flags = SUBPICTURE_ALIGN_BOTTOM;
p_spu->i_start = i_pts;
p_spu->i_stop = 0;
p_spu->b_ephemer = true;
p_spu->b_absolute = false;
p_spu->b_pausable = true;
if( !b_text )
{
p_spu->i_width =
p_spu->i_original_picture_width = fmt.i_width;
p_spu->i_height =
p_spu->i_original_picture_height = fmt.i_height;
}
/* */
*p_fmt = fmt;
return p_spu;
}
static void EventHandler( vbi_event *ev, void *user_data )
{
decoder_t *p_dec = (decoder_t *)user_data;
decoder_sys_t *p_sys = p_dec->p_sys;
if( ev->type == VBI_EVENT_TTX_PAGE )
{
#ifdef ZVBI_DEBUG
msg_Info( p_dec, "Page %03x.%02x ",
ev->ev.ttx_page.pgno,
ev->ev.ttx_page.subno & 0xFF);
#endif
if( p_sys->i_last_page == vbi_bcd2dec( ev->ev.ttx_page.pgno ) )
p_sys->b_update = true;
if( ev->ev.ttx_page.clock_update )
msg_Dbg( p_dec, "clock" );
#ifdef ZVBI_DEBUG
if( ev->ev.ttx_page.header_update )
msg_Dbg( p_dec, "header" );
#endif
}
else if( ev->type == VBI_EVENT_CAPTION )
msg_Dbg( p_dec, "Caption line: %x", ev->ev.caption.pgno );
else if( ev->type == VBI_EVENT_NETWORK )
msg_Dbg( p_dec, "Network change" );
else if( ev->type == VBI_EVENT_ASPECT )
msg_Dbg( p_dec, "Aspect update" );
else if( ev->type == VBI_EVENT_NETWORK )
msg_Dbg( p_dec, "Program info received" );
}
static int OpaquePage( picture_t *p_src, const vbi_page p_page,
const video_format_t fmt, bool b_opaque )
{
unsigned int x, y;
assert( fmt.i_chroma == VLC_FOURCC('R','G','B','A' ) );
/* Kludge since zvbi doesn't provide an option to specify opacity. */
for( y = 0; y < fmt.i_height; y++ )
{
for( x = 0; x < fmt.i_width; x++ )
{
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) == 0xff000000 && 0 ) /* Disabled until someone implement borders */
*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;
}