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Commit 2cdbf636 authored by Laurent Aimar's avatar Laurent Aimar
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Closed captions decoder. 

The rollup and paint on mode is not really good (a lot of flicker) but
I don't see how to fix it (the subtitle is updated as soon as a new
character is added).
parent 799f3e39
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Showing with 1286 additions and 0 deletions
modules/codec/cc.c 0 → 100644
View file @ 2cdbf636
/*****************************************************************************
* cc608.c : CC 608/708 subtitles decoder
*****************************************************************************
* Copyright (C) 2007 Laurent Aimar
* $Id: subsdec.c 22151 2007-09-18 16:20:49Z courmisch $
*
* Authors: Laurent Aimar < fenrir # via.ecp.fr>
*
* 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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
/* The EIA 608 decoder part has been initialy based on ccextractor (GPL)
* and rewritten */
/* TODO:
* On discontinuity reset the decoder state
* Check parity
* 708 decoding
*/
#include <vlc/vlc.h>
#include <vlc_vout.h>
#include <vlc_codec.h>
#include <vlc_input.h>
#include <vlc_osd.h>
#include <vlc_filter.h>
#include <vlc_image.h>
#include <vlc_charset.h>
#include <vlc_stream.h>
#include <vlc_xml.h>
#include <errno.h>
#include <string.h>
/*****************************************************************************
* Module descriptor.
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
set_shortname( _("CC 608/708"));
set_description( _("Closed Captions decoder") );
set_capability( "decoder", 50 );
set_callbacks( Open, Close );
vlc_module_end();
/*****************************************************************************
* Local prototypes
*****************************************************************************/
typedef enum
{
EIA608_MODE_POPUP = 0,
EIA608_MODE_ROLLUP_2 = 1,
EIA608_MODE_ROLLUP_3 = 2,
EIA608_MODE_ROLLUP_4 = 3,
EIA608_MODE_PAINTON = 4,
EIA608_MODE_TEXT = 5
} eia608_mode_t;
typedef enum
{
EIA608_COLOR_WHITE = 0,
EIA608_COLOR_GREEN = 1,
EIA608_COLOR_BLUE = 2,
EIA608_COLOR_CYAN = 3,
EIA608_COLOR_RED = 4,
EIA608_COLOR_YELLOW = 5,
EIA608_COLOR_MAGENTA = 6,
EIA608_COLOR_USERDEFINED = 7
} eia608_color_t;
typedef enum
{
EIA608_FONT_REGULAR = 0x00,
EIA608_FONT_ITALICS = 0x01,
EIA608_FONT_UNDERLINE = 0x02,
EIA608_FONT_UNDERLINE_ITALICS = EIA608_FONT_UNDERLINE | EIA608_FONT_ITALICS
} eia608_font_t;
#define EIA608_SCREEN_ROWS 15
#define EIA608_SCREEN_COLUMNS 32
struct eia608_screen // A CC buffer
{
uint8_t characters[EIA608_SCREEN_ROWS][EIA608_SCREEN_COLUMNS+1];
eia608_color_t colors[EIA608_SCREEN_ROWS][EIA608_SCREEN_COLUMNS+1];
eia608_font_t fonts[EIA608_SCREEN_ROWS][EIA608_SCREEN_COLUMNS+1]; // Extra char at the end for a 0
int row_used[EIA608_SCREEN_ROWS]; // Any data in row?
};
typedef struct eia608_screen eia608_screen;
typedef struct
{
/* Current channel (used to reject packet without channel information) */
int i_channel;
/* */
int i_screen; /* Displayed screen */
eia608_screen screen[2];
struct
{
int i_row;
int i_column;
} cursor;
/* */
eia608_mode_t mode;
eia608_color_t color;
eia608_font_t font;
int i_row_rollup;
/* Last command pair (used to reject duplicated command) */
struct
{
uint8_t d1;
uint8_t d2;
} last;
} eia608_t;
static void Eia608Init( eia608_t * );
static vlc_bool_t Eia608Parse( eia608_t *h, int i_channel_selected, const uint8_t data[2] );
static char *Eia608Text( eia608_t *h, vlc_bool_t b_html );
static void Eia608Exit( eia608_t * );
/* It will be enough up to 63 B frames, which is far too high for
* broadcast environment */
#define CC_MAX_REORDER_SIZE (64)
struct decoder_sys_t
{
int i;
int i_block;
block_t *pp_block[CC_MAX_REORDER_SIZE];
block_t *p_current;
int i_field;
int i_channel;
eia608_t eia608;
};
static subpicture_t *Decode( decoder_t *, block_t ** );
/*****************************************************************************
* 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;
int i_field;
int i_channel;
switch( p_dec->fmt_in.i_codec )
{
case VLC_FOURCC('c','c','1',' '):
i_field = 0; i_channel = 1;
break;
case VLC_FOURCC('c','c','2',' '):
i_field = 0; i_channel = 2;
break;
case VLC_FOURCC('c','c','3',' '):
i_field = 1; i_channel = 1;
break;
case VLC_FOURCC('c','c','4',' '):
i_field = 1; i_channel = 2;
break;
default:
return VLC_EGENERIC;
}
p_dec->pf_decode_sub = Decode;
/* Allocate the memory needed to store the decoder's structure */
p_dec->p_sys = p_sys = malloc( sizeof( *p_sys ) );
if( p_sys == NULL )
{
msg_Err( p_dec, "out of memory" );
return VLC_ENOMEM;
}
/* init of p_sys */
memset( p_sys, 0, sizeof( *p_sys ) );
p_sys->i_block = 0;
p_sys->p_current = NULL;
p_sys->i_field = i_field;
p_sys->i_channel = i_channel;
Eia608Init( &p_sys->eia608 );
return VLC_SUCCESS;
}
/****************************************************************************
* Decode: the whole thing
****************************************************************************
*
****************************************************************************/
static void Push( decoder_t *, block_t * );
static block_t *Pop( decoder_t * );
static subpicture_t *Convert( decoder_t *, block_t * );
static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
if( pp_block && *pp_block )
{
Push( p_dec, *pp_block );
*pp_block = NULL;
}
for( ;; )
{
block_t *p_block;
p_block = p_sys->p_current;
if( !p_block )
p_block = Pop( p_dec );
if( !p_block )
break;
subpicture_t *p_spu = Convert( p_dec, p_block );
if( p_spu )
return p_spu;
}
return NULL;
}
/*****************************************************************************
* CloseDecoder: clean up the decoder
*****************************************************************************/
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;
int i;
for( i = 0; i < p_sys->i_block; i++ )
block_Release( p_sys->pp_block[i] );
Eia608Exit( &p_sys->eia608 );
free( p_sys );
}
/*****************************************************************************
*
*****************************************************************************/
static void Push( decoder_t *p_dec, block_t *p_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
if( p_sys->i_block >= CC_MAX_REORDER_SIZE )
{
msg_Warn( p_dec, "Trashing a CC entry" );
memmove( &p_sys->pp_block[0], &p_sys->pp_block[1], sizeof(*p_sys->pp_block) * (CC_MAX_REORDER_SIZE-1) );
p_sys->i_block--;
}
p_sys->pp_block[p_sys->i_block++] = p_block;
}
static block_t *Pop( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
int i_index;
int i;
/* XXX Cc captions data are OUT OF ORDER (because we receive them in the bitstream
* order (ie ordered by video picture dts) instead of the display order.
* We will simulate a simple IPB buffer scheme
* and reorder with pts.
* XXX it won't work with H264 which use non out of order B picture or MMCO
*/
/* Wait for a P and output all *previous* picture by pts order (for
* hierarchical B frames) */
if( p_sys->i_block <= 1 ||
( p_sys->pp_block[p_sys->i_block-1]->i_flags & BLOCK_FLAG_TYPE_B ) )
return NULL;
p_block = p_sys->pp_block[i_index = 0];
if( p_block->i_pts > 0 )
{
for( i = 1; i < p_sys->i_block-1; i++ )
{
if( p_sys->pp_block[i]->i_pts > 0 && p_block->i_pts > 0 &&
p_sys->pp_block[i]->i_pts < p_block->i_pts )
p_block = p_sys->pp_block[i_index = i];
}
}
assert( i_index+1 < p_sys->i_block );
memmove( &p_sys->pp_block[i_index], &p_sys->pp_block[i_index+1], sizeof(*p_sys->pp_block) * ( p_sys->i_block - i_index - 1 ) );
p_sys->i_block--;
return p_block;
}
static subpicture_t *Subtitle( decoder_t *p_dec, char *psz_subtitle, char *psz_html, mtime_t i_pts )
{
//decoder_sys_t *p_sys = p_dec->p_sys;
subpicture_t *p_spu = NULL;
video_format_t fmt;
/* We cannot display a subpicture with no date */
if( i_pts == 0 )
{
msg_Warn( p_dec, "subtitle without a date" );
return NULL;
}
EnsureUTF8( psz_subtitle );
if( psz_html )
EnsureUTF8( psz_html );
/* 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" );
free( psz_subtitle );
if( psz_html )
free( psz_html );
return NULL;
}
p_spu->b_pausable = VLC_TRUE;
/* Create a new subpicture region */
memset( &fmt, 0, sizeof(video_format_t) );
fmt.i_chroma = VLC_FOURCC('T','E','X','T');
fmt.i_aspect = 0;
fmt.i_width = fmt.i_height = 0;
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 )
{
msg_Err( p_dec, "cannot allocate SPU region" );
free( psz_subtitle );
if( psz_html )
free( psz_html );
p_dec->pf_spu_buffer_del( p_dec, p_spu );
return NULL;
}
/* Decode and format the subpicture unit */
/* Normal text subs, easy markup */
p_spu->p_region->i_align = SUBPICTURE_ALIGN_BOTTOM;// | SUBPICTURE_ALIGN_LEFT;// | p_sys->i_align;
p_spu->i_x = 0; //p_sys->i_align ? 20 : 0;
p_spu->i_y = 10;
p_spu->p_region->psz_text = psz_subtitle;
p_spu->p_region->psz_html = psz_html;
p_spu->i_start = i_pts;
p_spu->i_stop = i_pts + 10000000; /* 10s max */
p_spu->b_ephemer = VLC_TRUE;
p_spu->b_absolute = VLC_FALSE;
return p_spu;
}
static subpicture_t *Convert( decoder_t *p_dec, block_t *p_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
const int64_t i_pts = p_block->i_pts;
vlc_bool_t b_changed = VLC_FALSE;
p_sys->p_current = p_block;
/* TODO do the real decoding here */
while( p_block && p_block->i_buffer >= 3 )
{
if( p_block->p_buffer[0] == p_sys->i_field )
b_changed |= Eia608Parse( &p_sys->eia608, p_sys->i_channel, &p_block->p_buffer[1] );
p_block->i_buffer -= 3;
p_block->p_buffer += 3;
if( p_block->i_buffer <= 0 )
{
block_Release( p_block );
p_sys->p_current = p_block = NULL;
}
}
static int64_t i_last = 0;
if( b_changed )//&& i_pts - i_last > 100*1000 )
{
char *psz_subtitle = Eia608Text( &p_sys->eia608, VLC_FALSE );
char *psz_html = NULL;//Eia608Text( &p_sys->eia608, VLC_TRUE );
i_last = i_pts;
return Subtitle( p_dec, psz_subtitle, psz_html, i_pts );
}
return NULL;
}
/*****************************************************************************
*
*****************************************************************************/
static const struct {
eia608_color_t i_color;
eia608_font_t i_font;
int i_column;
} pac2_attribs[]= {
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_GREEN, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_GREEN, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_BLUE, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_BLUE, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_CYAN, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_CYAN, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_RED, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_RED, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_YELLOW, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_YELLOW, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_MAGENTA, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_MAGENTA, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_WHITE, EIA608_FONT_ITALICS, 0 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE_ITALICS, 0 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 0 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 0 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 4 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 4 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 8 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 8 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 12 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 12 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 16 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 16 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 20 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 20 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 24 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 24 },
{ EIA608_COLOR_WHITE, EIA608_FONT_REGULAR, 28 },
{ EIA608_COLOR_WHITE, EIA608_FONT_UNDERLINE, 28 } ,
};
#define EIA608_COLOR_DEFAULT EIA608_COLOR_WHITE
static void Eia608Cursor( eia608_t *h, int dx )
{
h->cursor.i_column += dx;
if( h->cursor.i_column < 0 )
h->cursor.i_column = 0;
else if( h->cursor.i_column > EIA608_SCREEN_COLUMNS-1 )
h->cursor.i_column = EIA608_SCREEN_COLUMNS-1;
}
static void Eia608ClearScreenRowX( eia608_t *h, int i_screen, int i_row, int x )
{
eia608_screen *screen = &h->screen[i_screen];
int i;
if( x == 0 )
{
screen->row_used[i_row] = VLC_FALSE;
}
else
{
screen->row_used[i_row] = VLC_FALSE;
for( i = 0; i < x; i++ )
{
if( screen->characters[i_row][i] != ' ' ||
screen->colors[i_row][i] != EIA608_COLOR_DEFAULT ||
screen->fonts[i_row][i] != EIA608_FONT_REGULAR )
{
screen->row_used[i_row] = VLC_TRUE;
break;
}
}
}
for( ; x < EIA608_SCREEN_COLUMNS+1; x++ )
{
screen->characters[i_row][x] = x < EIA608_SCREEN_COLUMNS ? ' ' : '\0';
screen->colors[i_row][x] = EIA608_COLOR_DEFAULT;
screen->fonts[i_row][x] = EIA608_FONT_REGULAR;
}
}
static void Eia608ClearScreenRow( eia608_t *h, int i_screen, int i_row )
{
Eia608ClearScreenRowX( h, i_screen, i_row, 0 );
}
static void Eia608ClearScreen( eia608_t *h, int i_screen )
{
int i;
for( i = 0; i < EIA608_SCREEN_ROWS; i++ )
Eia608ClearScreenRow( h, i_screen, i );
}
static int Eia608GetWritingScreenIndex( eia608_t *h )
{
switch( h->mode )
{
case EIA608_MODE_POPUP: // Non displayed screen
return 1 - h->i_screen;
case EIA608_MODE_ROLLUP_2: // Displayed screen
case EIA608_MODE_ROLLUP_3:
case EIA608_MODE_ROLLUP_4:
case EIA608_MODE_PAINTON:
return h->i_screen;
default:
/* It cannot happen, else it is a bug */
assert( 0 );
return 0;
}
}
static void Eia608EraseScreen( eia608_t *h, vlc_bool_t b_displayed )
{
Eia608ClearScreen( h, b_displayed ? h->i_screen : (1-h->i_screen) );
}
static void Eia608Write( eia608_t *h, const uint8_t c )
{
const int i_row = h->cursor.i_row;
const int i_column = h->cursor.i_column;
eia608_screen *screen;
if( h->mode == EIA608_MODE_TEXT )
return;
screen = &h->screen[Eia608GetWritingScreenIndex( h )];
screen->characters[i_row][i_column] = c;
screen->colors[i_row][i_column] = h->color;
screen->fonts[i_row][i_column] = h->font;
screen->row_used[i_row] = VLC_TRUE;
Eia608Cursor( h, 1 );
}
static void Eia608Erase( eia608_t *h )
{
const int i_row = h->cursor.i_row;
const int i_column = h->cursor.i_column - 1;
eia608_screen *screen;
if( h->mode == EIA608_MODE_TEXT )
return;
if( i_column < 0 )
return;
screen = &h->screen[Eia608GetWritingScreenIndex( h )];
/* FIXME do we need to reset row_used/colors/font ? */
screen->characters[i_row][i_column] = ' ';
Eia608Cursor( h, -1 );
}
static void Eia608EraseToEndOfRow( eia608_t *h )
{
if( h->mode == EIA608_MODE_TEXT )
return;
Eia608ClearScreenRowX( h, Eia608GetWritingScreenIndex( h ), h->cursor.i_row, h->cursor.i_column );
}
static void Eia608RollUp( eia608_t *h )
{
const int i_screen = Eia608GetWritingScreenIndex( h );
eia608_screen *screen = &h->screen[i_screen];
int keep_lines;
int i;
/* Window size */
if( h->mode == EIA608_MODE_ROLLUP_2 )
keep_lines = 2;
else if( h->mode == EIA608_MODE_ROLLUP_3 )
keep_lines = 3;
else if( h->mode == EIA608_MODE_ROLLUP_4 )
keep_lines = 4;
else
return;
/* Reset the cursor */
h->cursor.i_column = 0;
/* Erase lines above our window */
for( i = 0; i < h->cursor.i_row - keep_lines; i++ )
Eia608ClearScreenRow( h, i_screen, i );
/* Move up */
for( i = 0; i < keep_lines-1; i++ )
{
const int i_row = h->cursor.i_row - keep_lines + i + 1;
if( i_row < 0 )
continue;
assert( i_row+1 < EIA608_SCREEN_ROWS );
memcpy( screen->characters[i_row], screen->characters[i_row+1], sizeof(*screen->characters) );
memcpy( screen->colors[i_row], screen->colors[i_row+1], sizeof(*screen->colors) );
memcpy( screen->fonts[i_row], screen->fonts[i_row+1], sizeof(*screen->fonts) );
screen->row_used[i_row] = screen->row_used[i_row+1];
}
/* Reset current row */
Eia608ClearScreenRow( h, i_screen, h->cursor.i_row );
}
static void Eia608ParseChannel( eia608_t *h, uint8_t d1 )
{
if( d1 == 0x14 )
h->i_channel = 1;
else if( d1 == 0x1c )
h->i_channel = 2;
else if( ( d1 >= 0x01 && d1 <= 0x0f ) || d1 == 0x15 )
h->i_channel = 3;
else if( d1 == 0x1d )
h->i_channel = 4;
}
static vlc_bool_t Eia608ParseTextAttribute( eia608_t *h, uint8_t d2 )
{
const int i_index = d2 - 0x20;
assert( d2 >= 0x20 && d2 <= 0x2f );
h->color = pac2_attribs[i_index].i_color;
h->font = pac2_attribs[i_index].i_font;
Eia608Cursor( h, 1 );
return VLC_FALSE;
}
static vlc_bool_t Eia608ParseSingle( eia608_t *h, const uint8_t dx )
{
assert( dx >= 0x20 );
Eia608Write( h, dx );
return VLC_TRUE;
}
static vlc_bool_t Eia608ParseDouble( eia608_t *h, uint8_t d2 )
{
assert( d2 >= 0x30 && d2 <= 0x3f );
Eia608Write( h, d2 + 0x50 ); /* We use charaters 0x80...0x8f */
return VLC_TRUE;
}
static vlc_bool_t Eia608ParseExtended( eia608_t *h, uint8_t d1, uint8_t d2 )
{
assert( d2 >= 0x20 && d2 <= 0x3f );
assert( d1 == 0x12 || d1 == 0x13 );
if( d1 == 0x12 )
d2 += 0x70; /* We use charaters 0x90-0xaf */
else
d2 += 0x90; /* We use charaters 0xb0-0xcf */
/* The extended characters replace the previous one with a more
* advanced one */
Eia608Cursor( h, -1 );
Eia608Write( h, d2 );
return VLC_TRUE;
}
static vlc_bool_t Eia608ParseCommand0x14( eia608_t *h, uint8_t d2 )
{
vlc_bool_t b_changed = VLC_FALSE;
switch( d2 )
{
case 0x20: /* Resume caption loading */
h->mode = EIA608_MODE_POPUP;
break;
case 0x21: /* Backspace */
Eia608Erase( h );
b_changed = VLC_TRUE;
break;
case 0x22: /* Reserved */
case 0x23:
break;
case 0x24: /* Delete to end of row */
Eia608EraseToEndOfRow( h );
break;
case 0x25: /* Rollup 2 */
case 0x26: /* Rollup 3 */
case 0x27: /* Rollup 4 */
if( h->mode == EIA608_MODE_POPUP || h->mode == EIA608_MODE_PAINTON )
{
Eia608EraseScreen( h, VLC_TRUE );
Eia608EraseScreen( h, VLC_FALSE );
b_changed = VLC_TRUE;
}
if( d2 == 0x25 )
h->mode = EIA608_MODE_ROLLUP_2;
else if( d2 == 0x26 )
h->mode = EIA608_MODE_ROLLUP_3;
else
h->mode = EIA608_MODE_ROLLUP_4;
h->cursor.i_column = 0;
h->cursor.i_row = h->i_row_rollup;
break;
case 0x28: /* Flash on */
/* TODO */
break;
case 0x29: /* Resume direct captionning */
h->mode = EIA608_MODE_PAINTON;
break;
case 0x2a: /* Text restart */
/* TODO */
break;
case 0x2b: /* Resume text display */
h->mode = EIA608_MODE_TEXT;
break;
case 0x2c: /* Erase displayed memory */
Eia608EraseScreen( h, VLC_TRUE );
b_changed = VLC_TRUE;
break;
case 0x2d: /* Carriage return */
Eia608RollUp(h);
b_changed = VLC_TRUE;
break;
case 0x2e: /* Erase non displayed memory */
Eia608EraseScreen( h, VLC_FALSE );
break;
case 0x2f: /* End of caption (flip screen if not paint on) */
if( h->mode != EIA608_MODE_PAINTON )
h->i_screen = 1 - h->i_screen;
h->mode = EIA608_MODE_POPUP;
h->cursor.i_column = 0;
h->cursor.i_row = 0;
h->color = EIA608_COLOR_DEFAULT;
h->font = EIA608_FONT_REGULAR;
b_changed = VLC_TRUE;
break;
}
return b_changed;
}
static vlc_bool_t Eia608ParseCommand0x17( eia608_t *h, uint8_t d2 )
{
switch( d2 )
{
case 0x21: /* Tab offset 1 */
Eia608Cursor( h, 1 );
break;
case 0x22: /* Tab offset 2 */
Eia608Cursor( h, 2 );
break;
case 0x23: /* Tab offset 3 */
Eia608Cursor( h, 3 );
break;
}
return VLC_FALSE;
}
static vlc_bool_t Eia608ParsePac( eia608_t *h, uint8_t d1, uint8_t d2 )
{
static const int pi_row[] = {
11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10
};
const int i_row_index = ( (d1<<1) & 0x0e) | ( (d2>>5) & 0x01 );
assert( d2 >= 0x40 && d2 <= 0x7f );
if( pi_row[i_row_index] <= 0 )
return VLC_FALSE;
/* Row */
if( h->mode != EIA608_MODE_TEXT )
h->cursor.i_row = pi_row[i_row_index] - 1;
h->i_row_rollup = pi_row[i_row_index] - 1;
/* Column */
if( d2 >= 0x60 )
d2 -= 0x60;
else if( d2 >= 0x40 )
d2 -= 0x40;
h->cursor.i_column = pac2_attribs[d2].i_column;
return VLC_FALSE;
}
static vlc_bool_t Eia608ParseData( eia608_t *h, uint8_t d1, uint8_t d2 )
{
vlc_bool_t b_changed = VLC_FALSE;
if( d1 >= 0x18 && d1 <= 0x1f )
d1 -= 8;
#define ON( d2min, d2max, cmd ) do { if( d2 >= d2min && d2 <= d2max ) b_changed = cmd; } while(0)
switch( d1 )
{
case 0x11:
ON( 0x20, 0x2f, Eia608ParseTextAttribute( h, d2 ) );
ON( 0x30, 0x3f, Eia608ParseDouble( h, d2 ) );
break;
case 0x12: case 0x13:
ON( 0x20, 0x3f, Eia608ParseExtended( h, d1, d2 ) );
break;
case 0x14: case 0x15:
ON( 0x20, 0x2f, Eia608ParseCommand0x14( h, d2 ) );
break;
case 0x17:
ON( 0x21, 0x22, Eia608ParseCommand0x17( h, d2 ) );
ON( 0x2e, 0x2f, Eia608ParseTextAttribute( h, d2 ) );
break;
}
if( d1 == 0x10 )
ON( 0x40, 0x5f, Eia608ParsePac( h, d1, d2 ) );
else if( d1 >= 0x11 && d1 <= 0x17 )
ON( 0x40, 0x7f, Eia608ParsePac( h, d1, d2 ) );
#undef ON
if( d1 >= 0x20 )
{
b_changed = Eia608ParseSingle( h, d1 );
if( d2 >= 0x20 )
b_changed |= Eia608ParseSingle( h, d2 );
}
return b_changed;
}
static void Eia608TextUtf8( char *psz_utf8, uint8_t c ) // Returns number of bytes used
{
#define E1(c,u) { c, { u, '\0' } }
#define E2(c,u1,u2) { c, { u1, u2, '\0' } }
#define E3(c,u1,u2,u3) { c, { u1, u2, u3, '\0' } }
static const struct {
uint8_t c;
char utf8[3+1];
} c2utf8[] = {
// Regular line-21 character set, mostly ASCII except these exceptions
E2( 0x2a, 0xc3,0xa1), // lowercase a, acute accent
E2( 0x5c, 0xc3,0xa9), // lowercase e, acute accent
E2( 0x5e, 0xc3,0xad), // lowercase i, acute accent
E2( 0x5f, 0xc3,0xb3), // lowercase o, acute accent
E2( 0x60, 0xc3,0xba), // lowercase u, acute accent
E2( 0x7b, 0xc3,0xa7), // lowercase c with cedilla
E2( 0x7c, 0xc3,0xb7), // division symbol
E2( 0x7d, 0xc3,0x91), // uppercase N tilde
E2( 0x7e, 0xc3,0xb1), // lowercase n tilde
// THIS BLOCK INCLUDES THE 16 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
// THAT COME FROM HI BYTE=0x11 AND LOW BETWEEN 0x30 AND 0x3F
E2( 0x80, 0xc2,0xae), // Registered symbol (R)
E2( 0x81, 0xc2,0xb0), // degree sign
E2( 0x82, 0xc2,0xbd), // 1/2 symbol
E2( 0x83, 0xc2,0xbf), // Inverted (open) question mark
E3( 0x84, 0xe2,0x84,0xa2), // Trademark symbol (TM)
E2( 0x85, 0xc2,0xa2), // Cents symbol
E2( 0x86, 0xc2,0xa3), // Pounds sterling
E3( 0x87, 0xe2,0x99,0xaa), // Music note
E2( 0x88, 0xc3,0xa0), // lowercase a, grave accent
E1( 0x89, 0x20), // transparent space, we make it regular
E2( 0x8a, 0xc3,0xa8), // lowercase e, grave accent
E2( 0x8b, 0xc3,0xa2), // lowercase a, circumflex accent
E2( 0x8c, 0xc3,0xaa), // lowercase e, circumflex accent
E2( 0x8d, 0xc3,0xae), // lowercase i, circumflex accent
E2( 0x8e, 0xc3,0xb4), // lowercase o, circumflex accent
E2( 0x8f, 0xc3,0xbb), // lowercase u, circumflex accent
// THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
// THAT COME FROM HI BYTE=0x12 AND LOW BETWEEN 0x20 AND 0x3F
E2( 0x90, 0xc3,0x81), // capital letter A with acute
E2( 0x91, 0xc3,0x89), // capital letter E with acute
E2( 0x92, 0xc3,0x93), // capital letter O with acute
E2( 0x93, 0xc3,0x9a), // capital letter U with acute
E2( 0x94, 0xc3,0x9c), // capital letter U with diaresis
E2( 0x95, 0xc3,0xbc), // lowercase letter U with diaeresis
E1( 0x96, 0x27), // apostrophe
E2( 0x97, 0xc1,0xa1), // inverted exclamation mark
E1( 0x98, 0x2a), // asterisk
E1( 0x99, 0x27), // apostrophe (yes, duped). See CCADI source code.
E1( 0x9a, 0x2d), // hyphen-minus
E2( 0x9b, 0xc2,0xa9), // copyright sign
E3( 0x9c, 0xe2,0x84,0xa0), // Service mark
E1( 0x9d, 0x2e), // Full stop (.)
E1( 0x9e, 0x22), // Quoatation mark
E1( 0x9f, 0x22), // Quoatation mark
E2( 0xa0, 0xc3,0x80), // uppercase A, grave accent
E2( 0xa1, 0xc3,0x82), // uppercase A, circumflex
E2( 0xa2, 0xc3,0x87), // uppercase C with cedilla
E2( 0xa3, 0xc3,0x88), // uppercase E, grave accent
E2( 0xa4, 0xc3,0x8a), // uppercase E, circumflex
E2( 0xa5, 0xc3,0x8b), // capital letter E with diaresis
E2( 0xa6, 0xc3,0xab), // lowercase letter e with diaresis
E2( 0xa7, 0xc3,0x8e), // uppercase I, circumflex
E2( 0xa8, 0xc3,0x8f), // uppercase I, with diaresis
E2( 0xa9, 0xc3,0xaf), // lowercase i, with diaresis
E2( 0xaa, 0xc3,0x94), // uppercase O, circumflex
E2( 0xab, 0xc3,0x99), // uppercase U, grave accent
E2( 0xac, 0xc3,0xb9), // lowercase u, grave accent
E2( 0xad, 0xc3,0x9b), // uppercase U, circumflex
E2( 0xae, 0xc2,0xab), // LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
E2( 0xaf, 0xc2,0xbb), // RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
// THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
// THAT COME FROM HI BYTE=0x13 AND LOW BETWEEN 0x20 AND 0x3F
E2( 0xb0, 0xc3,0x83), // Uppercase A, tilde
E2( 0xb1, 0xc3,0xa3), // Lowercase a, tilde
E2( 0xb2, 0xc3,0x8d), // Uppercase I, acute accent
E2( 0xb3, 0xc3,0x8c), // Uppercase I, grave accent
E2( 0xb4, 0xc3,0xac), // Lowercase i, grave accent
E2( 0xb5, 0xc3,0x92), // Uppercase O, grave accent
E2( 0xb6, 0xc3,0xb2), // Lowercase o, grave accent
E2( 0xb7, 0xc3,0x95), // Uppercase O, tilde
E2( 0xb8, 0xc3,0xb5), // Lowercase o, tilde
E1( 0xb9, 0x7b), // Open curly brace
E1( 0xba, 0x7d), // Closing curly brace
E1( 0xbb, 0x5c), // Backslash
E1( 0xbc, 0x5e), // Caret
E1( 0xbd, 0x5f), // Underscore
E2( 0xbe, 0xc2,0xa6), // Pipe (broken bar)
E1( 0xbf, 0x7e), // Tilde (utf8 code unsure)
E2( 0xc0, 0xc3,0x84), // Uppercase A, umlaut
E2( 0xc1, 0xc3,0xa4), // Lowercase A, umlaut
E2( 0xc2, 0xc3,0x96), // Uppercase O, umlaut
E2( 0xc3, 0xc3,0xb6), // Lowercase o, umlaut
E2( 0xc4, 0xc3,0x9f), // Esszett (sharp S)
E2( 0xc5, 0xc2,0xa5), // Yen symbol
E2( 0xc6, 0xc2,0xa4), // Currency symbol
E1( 0xc7, 0x7c), // Vertical bar
E2( 0xc8, 0xc3,0x85), // Uppercase A, ring
E2( 0xc9, 0xc3,0xa5), // Lowercase A, ring
E2( 0xca, 0xc3,0x98), // Uppercase O, slash
E2( 0xcb, 0xc3,0xb8), // Lowercase o, slash
E3( 0xcc, 0xe2,0x8c,0x9c), // Upper left corner
E3( 0xcd, 0xe2,0x8c,0x9d), // Upper right corner
E3( 0xce, 0xe2,0x8c,0x9e), // Lower left corner
E3( 0xcf, 0xe2,0x8c,0x9f), // Lower right corner
E1(0,0)
};
#undef E3
#undef E2
#undef E1
static const int i_c2utf8 = sizeof(c2utf8)/sizeof(*c2utf8);
int i;
for( i = 0; i < i_c2utf8; i++ )
{
if( c2utf8[i].c == c )
break;
}
if( i >= i_c2utf8 )
{
psz_utf8[0] = c < 0x80 ? c : '?'; /* Normal : Unsupported */
psz_utf8[1] = '\0';
}
else
{
strcpy( psz_utf8, c2utf8[i].utf8 );
}
}
static void Eia608Strlcat( char *d, const char *s, int i_max )
{
if( i_max > 1 )
strncat( d, s, i_max-1 - strnlen(d, i_max-1));
if( i_max > 0 )
d[i_max-1] = '\0';
}
static void Eia608TextLine( struct eia608_screen *screen, char *psz_text, int i_text_max, int i_row, vlc_bool_t b_html )
{
const uint8_t *p_char = screen->characters[i_row];
const eia608_color_t *p_color = screen->colors[i_row];
const eia608_font_t *p_font = screen->fonts[i_row];
int i_start;
int i_end;
int x;
eia608_color_t last_color = EIA608_COLOR_DEFAULT;
vlc_bool_t b_last_italics = VLC_FALSE;
vlc_bool_t b_last_underline = VLC_FALSE;
/* Search the start */
i_start = 0;
while( i_start < EIA608_SCREEN_COLUMNS-1 && p_char[i_start] == ' ' )
i_start++;
/* Search the end */
i_end = EIA608_SCREEN_COLUMNS-1;
while( i_end > i_start && p_char[i_end] == ' ' )
i_end--;
/* */
#define CAT(t) Eia608Strlcat( psz_text, t, i_text_max )
for( x = i_start; x <= i_end; x++ )
{
eia608_color_t color = p_color[x];
vlc_bool_t b_italics = p_font[x] & EIA608_FONT_ITALICS;
vlc_bool_t b_underline = p_font[x] & EIA608_FONT_UNDERLINE;
char utf8[4];
/* */
if( b_html )
{
vlc_bool_t b_close_color, b_close_italics, b_close_underline;
/* We create the tags font / i / u in that orders */
b_close_color = color != last_color && last_color != EIA608_COLOR_DEFAULT;
b_close_italics = !b_italics && b_last_italics;
b_close_underline = !b_underline && b_last_underline;
/* Be sure to create valid html */
b_close_italics |= b_last_italics && b_close_color;
b_close_underline = b_last_underline && ( b_close_italics || b_close_color );
if( b_close_underline )
CAT( "</u>" );
if( b_close_italics )
CAT( "</i>" );
if( b_close_color )
CAT( "</font>" );
if( color != EIA608_COLOR_DEFAULT && color != last_color)
{
static const char *ppsz_color[] = {
"#ffffff", // white
"#00ff00", // green
"#0000ff", // blue
"#00ffff", // cyan
"#ff0000", // red
"#ffff00", // yellow
"#ff00ff", // magenta
"#ffffff", // user defined XXX we use white
};
CAT( "<font color=" );
CAT( ppsz_color[color] );
CAT( ">" );
}
if( ( b_close_italics && b_italics ) || ( b_italics && !b_last_italics ) )
CAT( "<i>" );
if( ( b_close_underline && b_underline ) || ( b_underline && !b_last_underline ) )
CAT( "<u>" );
}
/* */
Eia608TextUtf8( utf8, p_char[x] );
CAT( utf8 );
/* */
b_last_underline = b_underline;
b_last_italics = b_italics;
last_color = color;
}
if( b_html )
{
if( b_last_underline )
CAT( "</u>" );
if( b_last_italics )
CAT( "</i>" );
if( last_color != EIA608_COLOR_DEFAULT )
CAT( "</font>" );
}
#undef CAT
}
/* */
static void Eia608Init( eia608_t *h )
{
memset( h, 0, sizeof(*h) );
/* */
h->i_channel = -1;
h->i_screen = 0;
Eia608ClearScreen( h, 0 );
Eia608ClearScreen( h, 1 );
/* Cursor for writing text */
h->cursor.i_column = 0;
h->cursor.i_row = 0;
h->last.d1 = 0x00;
h->last.d2 = 0x00;
h->mode = EIA608_MODE_POPUP;
h->color = EIA608_COLOR_DEFAULT;
h->font = EIA608_FONT_REGULAR;
h->i_row_rollup = EIA608_SCREEN_ROWS-1;
}
static vlc_bool_t Eia608Parse( eia608_t *h, int i_channel_selected, const uint8_t data[2] )
{
const uint8_t d1 = data[0] & 0x7f; /* Removed parity bit TODO we might want to check them */
const uint8_t d2 = data[1] & 0x7f;
vlc_bool_t b_screen_changed = VLC_FALSE;
if( d1 == 0 && d2 == 0 )
return VLC_FALSE; /* Ignore padding */
Eia608ParseChannel( h, d1 );
if( h->i_channel != i_channel_selected )
return VLC_FALSE;
if( d1 >= 0x10 )
{
if( d1 >= 0x20 ||
d1 != h->last.d1 || d2 != h->last.d2 ) /* Command codes can be repeated */
b_screen_changed = Eia608ParseData( h, d1,d2 );
h->last.d1 = d1;
h->last.d2 = d2;
}
else if( ( d1 >= 0x01 && d1 <= 0x0E ) || d1 == 0x0F )
{
/* XDS block / End of XDS block */
}
return b_screen_changed;
}
static char *Eia608Text( eia608_t *h, vlc_bool_t b_html )
{
const int i_size = EIA608_SCREEN_ROWS * 3 * EIA608_SCREEN_COLUMNS+1;
struct eia608_screen *screen = &h->screen[h->i_screen];
vlc_bool_t b_first = VLC_TRUE;
char *psz;
int i;
/* We allocate a buffer big enough for normal case */
psz = malloc( i_size );
*psz = '\0';
if( b_html )
Eia608Strlcat( psz, "<text>", i_size );
for( i = 0; i < EIA608_SCREEN_ROWS; i++ )
{
if( !screen->row_used[i] )
continue;
if( !b_first )
Eia608Strlcat( psz, b_html ? "<br />" : "\n", i_size );
b_first = VLC_FALSE;
Eia608TextLine( screen, psz, i_size, i, b_html );
}
if( b_html )
Eia608Strlcat( psz, "</text>", i_size );
return psz;
}
static void Eia608Exit( eia608_t *h )
{
}
modules/codec/cc.h 0 → 100644
View file @ 2cdbf636
/*****************************************************************************
* cc.h
*****************************************************************************
* Copyright (C) 2007 Laurent Aimar
* $Id: csa.h 20134 2007-05-16 14:30:27Z jpsaman $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* 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.
*****************************************************************************/
#ifndef _CC_H
#define _C_H 1
/* CC have a maximum rate of 9600 bit/s (per field?) */
#define CC_MAX_DATA_SIZE (2 * 3*600)
typedef struct
{
/* Which channel are present */
vlc_bool_t pb_present[4];
/* CC data per field
* byte[x+0]: field (0/1)
* byte[x+1]: cc data 1
* byte[x+2]: cc data 2
*/
int i_data;
uint8_t p_data[CC_MAX_DATA_SIZE];
} cc_data_t;
static inline int cc_Channel( int i_field, const uint8_t p_data[2] )
{
const uint8_t d = p_data[0] & 0x7f;
if( i_field != 0 && i_field != 1 )
return -1;
if( d == 0x14 )
return 2*i_field + 0;
else if( d == 0x1c )
return 2*i_field + 1;
/* unknown(middle of a command) or not cc channel */
return -1;
}
static inline void cc_Init( cc_data_t *c )
{
int i;
for( i = 0; i < 4; i++ )
c-> pb_present[i] = VLC_FALSE;
c->i_data = 0;
}
static inline void cc_Exit( cc_data_t *c )
{
return;
}
static inline void cc_Flush( cc_data_t *c )
{
c->i_data = 0;
}
static inline void cc_Extract( cc_data_t *c, const uint8_t *p_src, int i_src )
{
static const uint8_t p_cc_ga94[4] = { 0x47, 0x41, 0x39, 0x34 };
//static const uint8_t p_afd_start[4] = { 0x44, 0x54, 0x47, 0x31 };
if( i_src < 4 )
return;
/* cc_data()
* u1 reserved(1)
* u1 process_cc_data_flag
* u1 additional_data_flag
* u5 cc_count
* u8 reserved(1111 1111)
* for cc_count
* u5 marker bit(1111 1)
* u1 cc_valid
* u2 cc_type
* u8 cc_data_1
* u8 cc_data_2
* u8 marker bit(1111 1111)
* if additional_data_flag
* unknown
*/
/* cc_type:
* 0x00: field 1
* 0x01: field 2
*/
if( !memcmp( p_cc_ga94, p_src, 4 ) && i_src >= 5+1+1+1 && p_src[4] == 0x03 )
{
/* Extract CC from DVB/ATSC TS */
const uint8_t *cc = &p_src[5];
const int i_count_cc = cc[0]&0x1f;
int i;
if( !(cc[0]&0x40) ) // process flag
return;
if( i_src < 5 + 1+1 + i_count_cc*3 + 1) // broken packet
return;
if( i_count_cc <= 0 ) // no cc present
return;
if( cc[2+i_count_cc * 3] != 0xff ) // marker absent
return;
cc += 2;
for( i = 0; i < i_count_cc; i++, cc += 3 )
{
int i_field = cc[0] & 0x03;
int i_channel;
if( ( cc[0] & 0xfc ) != 0xfc )
continue;
if( i_field != 0 && i_field != 1 )
continue;
if( c->i_data + 3 > CC_MAX_DATA_SIZE )
continue;
i_channel = cc_Channel( i_field, &cc[1] );
if( i_channel >= 0 && i_channel < 4 )
c->pb_present[i_channel] = VLC_TRUE;
c->p_data[c->i_data++] = i_field;
c->p_data[c->i_data++] = cc[1];
c->p_data[c->i_data++] = cc[2];
}
}
else
{
/* TODO DVD CC, ... */
}
}
#endif /* _CC_H */
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