cc.c

VLC Player Source Code

    bool b_changed = false;

    /* TODO do the real decoding here */
    while( 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 )
        block_Release( p_block );

    if( b_changed )
    {
        char *psz_subtitle = Eia608Text( &p_sys->eia608, false );
        char *psz_html     = NULL;//Eia608Text( &p_sys->eia608, true );
        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] = false;
    }
    else
    {
        screen->row_used[i_row] = 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] = 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, bool 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] = 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 bool 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 false;
}
static bool Eia608ParseSingle( eia608_t *h, const uint8_t dx )
{
    assert( dx >= 0x20 );
    Eia608Write( h, dx );
    return true;
}
static bool Eia608ParseDouble( eia608_t *h, uint8_t d2 )
{
    assert( d2 >= 0x30 && d2 <= 0x3f );
    Eia608Write( h, d2 + 0x50 ); /* We use charaters 0x80...0x8f */
    return true;
}
static bool 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 true;
}
static bool Eia608ParseCommand0x14( eia608_t *h, uint8_t d2 )
{
    bool b_changed = false;

    switch( d2 )
    {
    case 0x20:  /* Resume caption loading */
        h->mode = EIA608_MODE_POPUP;
        break;
    case 0x21:  /* Backspace */
        Eia608Erase( h );
        b_changed = 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, true );
            Eia608EraseScreen( h, false );
            b_changed = 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, true );
        b_changed = true;
        break;
    case 0x2d: /* Carriage return */
        Eia608RollUp(h);
        b_changed = true;
        break;
    case 0x2e: /* Erase non displayed memory */
        Eia608EraseScreen( h, 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 = true;
        break;
    }
    return b_changed;
}
static bool 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 false;
}
static bool 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 )