subsusf.c 47 KB
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/*****************************************************************************
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 * subsusf.c : USF subtitles decoder
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 *****************************************************************************
 * Copyright (C) 2000-2006 the VideoLAN team
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 * $Id$
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 *
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 * Authors: Bernie Purcell <bitmap@videolan.org>
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 *
 * 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.
 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#include "subsdec.h"
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#include <vlc_plugin.h>
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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  OpenDecoder   ( vlc_object_t * );
static void CloseDecoder  ( vlc_object_t * );

static subpicture_t *DecodeBlock   ( decoder_t *, block_t ** );
static char         *CreatePlainText( char * );
static int           ParseImageAttachments( decoder_t *p_dec );

static subpicture_t        *ParseText     ( decoder_t *, block_t * );
static void                 ParseUSFHeader( decoder_t * );
static subpicture_region_t *ParseUSFString( decoder_t *, char *, subpicture_t * );
static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec, subpicture_t *p_spu, const char *psz_filename, int i_transparent_color );

/*****************************************************************************
 * Module descriptor.
 *****************************************************************************/

vlc_module_begin();
    set_capability( "decoder", 40 );
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    set_shortname( N_("USFSubs"));
    set_description( N_("USF subtitles decoder") );
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    set_callbacks( OpenDecoder, CloseDecoder );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_SCODEC );
    /* We inherit subsdec-align and subsdec-formatted from subsdec.c */
vlc_module_end();

/*****************************************************************************
 * OpenDecoder: probe the decoder and return score
 *****************************************************************************
 * Tries to launch a decoder and return score so that the interface is able
 * to chose.
 *****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
    decoder_t     *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;
    vlc_value_t    val;

    if( p_dec->fmt_in.i_codec != VLC_FOURCC('u','s','f',' ') )
    {
        return VLC_EGENERIC;
    }

    p_dec->pf_decode_sub = DecodeBlock;

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys =
          (decoder_sys_t *)calloc(1, sizeof(decoder_sys_t)) ) == NULL )
    {
        msg_Err( p_dec, "out of memory" );
        return VLC_ENOMEM;
    }

    /* Unused fields of p_sys - not needed for USF decoding */
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    p_sys->b_ass = false;
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    p_sys->iconv_handle = (vlc_iconv_t)-1;
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    p_sys->b_autodetect_utf8 = false;
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    /* init of p_sys */
    p_sys->i_align = 0;
    p_sys->i_original_height = -1;
    p_sys->i_original_width = -1;
    TAB_INIT( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
    TAB_INIT( p_sys->i_images, p_sys->pp_images );

    /* USF subtitles are mandated to be UTF-8, so don't need vlc_iconv */

    var_Create( p_dec, "subsdec-align", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "subsdec-align", &val );
    p_sys->i_align = val.i_int;

    ParseImageAttachments( p_dec );

    if( var_CreateGetBool( p_dec, "subsdec-formatted" ) )
    {
        if( p_dec->fmt_in.i_extra > 0 )
            ParseUSFHeader( p_dec );
    }

    return VLC_SUCCESS;
}

/****************************************************************************
 * DecodeBlock: the whole thing
 ****************************************************************************
 * This function must be fed with complete subtitles units.
 ****************************************************************************/
static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
    subpicture_t *p_spu = NULL;

    if( !pp_block || *pp_block == NULL ) return NULL;

    p_spu = ParseText( p_dec, *pp_block );

    block_Release( *pp_block );
    *pp_block = NULL;

    return p_spu;
}

/*****************************************************************************
 * CloseDecoder: clean up the decoder
 *****************************************************************************/
static void CloseDecoder( vlc_object_t *p_this )
{
    decoder_t *p_dec = (decoder_t *)p_this;
    decoder_sys_t *p_sys = p_dec->p_sys;

    if( p_sys->pp_ssa_styles )
    {
        int i;
        for( i = 0; i < p_sys->i_ssa_styles; i++ )
        {
            if( !p_sys->pp_ssa_styles[i] )
                continue;

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            free( p_sys->pp_ssa_styles[i]->psz_stylename );
            free( p_sys->pp_ssa_styles[i]->font_style.psz_fontname );
            free( p_sys->pp_ssa_styles[i] );
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        }
        TAB_CLEAN( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
    }
    if( p_sys->pp_images )
    {
        int i;
        for( i = 0; i < p_sys->i_images; i++ )
        {
            if( !p_sys->pp_images[i] )
                continue;

            if( p_sys->pp_images[i]->p_pic )
                p_sys->pp_images[i]->p_pic->pf_release( p_sys->pp_images[i]->p_pic );
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            free( p_sys->pp_images[i]->psz_filename );
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            free( p_sys->pp_images[i] );
        }
        TAB_CLEAN( p_sys->i_images, p_sys->pp_images );
    }

    free( p_sys );
}

/*****************************************************************************
 * ParseText: parse an text subtitle packet and send it to the video output
 *****************************************************************************/
static subpicture_t *ParseText( decoder_t *p_dec, block_t *p_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    subpicture_t *p_spu = NULL;
    char *psz_subtitle = NULL;

    /* We cannot display a subpicture with no date */
    if( p_block->i_pts == 0 )
    {
        msg_Warn( p_dec, "subtitle without a date" );
        return NULL;
    }

    /* Check validity of packet data */
    /* An "empty" line containing only \0 can be used to force
       and ephemer picture from the screen */
    if( p_block->i_buffer < 1 )
    {
        msg_Warn( p_dec, "no subtitle data" );
        return NULL;
    }

    /* Should be resiliant against bad subtitles */
    psz_subtitle = strndup( (const char *)p_block->p_buffer,
                            p_block->i_buffer );
    if( psz_subtitle == NULL )
        return NULL;

    /* USF Subtitles are mandated to be UTF-8 -- make sure it is */
    if (EnsureUTF8( psz_subtitle ) == NULL)
    {
        msg_Err( p_dec, _("USF subtitles must be in UTF-8 format.\n"
                 "This stream contains USF subtitles which aren't.") );
    }

    /* 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" );
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        free( psz_subtitle );
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        return NULL;
    }

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    p_spu->b_pausable = true;
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    /* Decode USF strings */
    p_spu->p_region = ParseUSFString( p_dec, psz_subtitle, p_spu );

    p_spu->i_start = p_block->i_pts;
    p_spu->i_stop = p_block->i_pts + p_block->i_length;
    p_spu->b_ephemer = (p_block->i_length == 0);
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    p_spu->b_absolute = false;
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    p_spu->i_original_picture_width = p_sys->i_original_width;
    p_spu->i_original_picture_height = p_sys->i_original_height;

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    free( psz_subtitle );
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    return p_spu;
}

static char *GrabAttributeValue( const char *psz_attribute,
                                 const char *psz_tag_start )
{
    if( psz_attribute && psz_tag_start )
    {
        char *psz_tag_end = strchr( psz_tag_start, '>' );
        char *psz_found   = strcasestr( psz_tag_start, psz_attribute );

        if( psz_found )
        {
            psz_found += strlen( psz_attribute );

            if(( *(psz_found++) == '=' ) &&
               ( *(psz_found++) == '\"' ))
            {
                if( psz_found < psz_tag_end )
                {
                    int   i_len = strcspn( psz_found, "\"" );
                    return strndup( psz_found, i_len );
                }
            }
        }
    }
    return NULL;
}

static ssa_style_t *ParseStyle( decoder_sys_t *p_sys, char *psz_subtitle )
{
    ssa_style_t *p_style   = NULL;
    char        *psz_style = GrabAttributeValue( "style", psz_subtitle );

    if( psz_style )
    {
        int i;

        for( i = 0; i < p_sys->i_ssa_styles; i++ )
        {
            if( !strcmp( p_sys->pp_ssa_styles[i]->psz_stylename, psz_style ) )
                p_style = p_sys->pp_ssa_styles[i];
        }
        free( psz_style );
    }
    return p_style;
}

static int ParsePositionAttributeList( char *psz_subtitle, int *i_align,
                                       int *i_x, int *i_y )
{
    int   i_mask = 0;

    char *psz_align    = GrabAttributeValue( "alignment", psz_subtitle );
    char *psz_margin_x = GrabAttributeValue( "horizontal-margin", psz_subtitle );
    char *psz_margin_y = GrabAttributeValue( "vertical-margin", psz_subtitle );
    /* -- UNSUPPORTED
    char *psz_relative = GrabAttributeValue( "relative-to", psz_subtitle );
    char *psz_rotate_x = GrabAttributeValue( "rotate-x", psz_subtitle );
    char *psz_rotate_y = GrabAttributeValue( "rotate-y", psz_subtitle );
    char *psz_rotate_z = GrabAttributeValue( "rotate-z", psz_subtitle );
    */

    *i_align = SUBPICTURE_ALIGN_BOTTOM;
    *i_x = 0;
    *i_y = 0;

    if( psz_align )
    {
        if( !strcasecmp( "TopLeft", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
        else if( !strcasecmp( "TopCenter", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_TOP;
        else if( !strcasecmp( "TopRight", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_RIGHT;
        else if( !strcasecmp( "MiddleLeft", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_LEFT;
        else if( !strcasecmp( "MiddleCenter", psz_align ) )
            *i_align = 0;
        else if( !strcasecmp( "MiddleRight", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_RIGHT;
        else if( !strcasecmp( "BottomLeft", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_LEFT;
        else if( !strcasecmp( "BottomCenter", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_BOTTOM;
        else if( !strcasecmp( "BottomRight", psz_align ) )
            *i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_RIGHT;

        i_mask |= ATTRIBUTE_ALIGNMENT;
        free( psz_align );
    }
    if( psz_margin_x )
    {
        *i_x = atoi( psz_margin_x );
        if( strchr( psz_margin_x, '%' ) )
            i_mask |= ATTRIBUTE_X_PERCENT;
        else
            i_mask |= ATTRIBUTE_X;

        free( psz_margin_x );
    }
    if( psz_margin_y )
    {
        *i_y = atoi( psz_margin_y );
        if( strchr( psz_margin_y, '%' ) )
            i_mask |= ATTRIBUTE_Y_PERCENT;
        else
            i_mask |= ATTRIBUTE_Y;

        free( psz_margin_y );
    }
    return i_mask;
}

static void SetupPositions( subpicture_region_t *p_region, char *psz_subtitle )
{
    int           i_mask = 0;
    int           i_align;
    int           i_x, i_y;

    i_mask = ParsePositionAttributeList( psz_subtitle, &i_align, &i_x, &i_y );

    if( i_mask & ATTRIBUTE_ALIGNMENT )
        p_region->i_align = i_align;

    /* TODO: Setup % based offsets properly, without adversely affecting
     *       everything else in vlc. Will address with separate patch, to
     *       prevent this one being any more complicated.
     */
    if( i_mask & ATTRIBUTE_X )
        p_region->i_x = i_x;
    else if( i_mask & ATTRIBUTE_X_PERCENT )
        p_region->i_x = 0;

    if( i_mask & ATTRIBUTE_Y )
        p_region->i_y = i_y;
    else if( i_mask & ATTRIBUTE_Y_PERCENT )
        p_region->i_y = 0;
}

static subpicture_region_t *CreateTextRegion( decoder_t *p_dec,
                                              subpicture_t *p_spu,
                                              char *psz_subtitle,
                                              int i_len,
                                              int i_sys_align )
{
    decoder_sys_t        *p_sys = p_dec->p_sys;
    subpicture_region_t  *p_text_region;
    video_format_t        fmt;

    /* 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_text_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );

    if( p_text_region != NULL )
    {
        ssa_style_t  *p_style = NULL;

        p_text_region->psz_text = NULL;
        p_text_region->psz_html = strndup( psz_subtitle, i_len );
        if( ! p_text_region->psz_html )
        {
            msg_Err( p_dec, "out of memory" );
            p_spu->pf_destroy_region( VLC_OBJECT(p_dec), p_text_region );
            return NULL;
        }

        p_style = ParseStyle( p_sys, p_text_region->psz_html );
        if( !p_style )
        {
            int i;

            for( i = 0; i < p_sys->i_ssa_styles; i++ )
            {
                if( !strcasecmp( p_sys->pp_ssa_styles[i]->psz_stylename, "Default" ) )
                    p_style = p_sys->pp_ssa_styles[i];
            }
        }

        if( p_style )
        {
            msg_Dbg( p_dec, "style is: %s", p_style->psz_stylename );

            p_text_region->p_style = &p_style->font_style;
            p_text_region->i_align = p_style->i_align;

            /* TODO: Setup % based offsets properly, without adversely affecting
             *       everything else in vlc. Will address with separate patch,
             *       to prevent this one being any more complicated.

                     * p_style->i_margin_percent_h;
                     * p_style->i_margin_percent_v;
             */
            p_text_region->i_x         = p_style->i_margin_h;
            p_text_region->i_y         = p_style->i_margin_v;

        }
        else
        {
            p_text_region->i_align = SUBPICTURE_ALIGN_BOTTOM | i_sys_align;
            p_text_region->i_x = i_sys_align ? 20 : 0;
            p_text_region->i_y = 10;
        }
        /* Look for position arguments which may override the style-based
         * defaults.
         */
        SetupPositions( p_text_region, psz_subtitle );

        p_text_region->p_next = NULL;
    }
    return p_text_region;
}

static int ParseImageAttachments( decoder_t *p_dec )
{
    decoder_sys_t        *p_sys = p_dec->p_sys;
    input_attachment_t  **pp_attachments;
    int                   i_attachments_cnt;
    int                   k = 0;

    if( VLC_SUCCESS != decoder_GetInputAttachments( p_dec, &pp_attachments, &i_attachments_cnt ))
        return VLC_EGENERIC;

    for( k = 0; k < i_attachments_cnt; k++ )
    {
        input_attachment_t *p_attach = pp_attachments[k];

        vlc_fourcc_t  type  = 0;

        if( ( !strcmp( p_attach->psz_mime, "image/bmp" ) )      || /* BMP */
            ( !strcmp( p_attach->psz_mime, "image/x-bmp" ) )    ||
            ( !strcmp( p_attach->psz_mime, "image/x-bitmap" ) ) ||
            ( !strcmp( p_attach->psz_mime, "image/x-ms-bmp" ) ) )
        {
             type = VLC_FOURCC('b','m','p',' ');
        }
        else if( ( !strcmp( p_attach->psz_mime, "image/x-portable-anymap" ) )  || /* PNM */
                 ( !strcmp( p_attach->psz_mime, "image/x-portable-bitmap" ) )  || /* PBM */
                 ( !strcmp( p_attach->psz_mime, "image/x-portable-graymap" ) ) || /* PGM */
                 ( !strcmp( p_attach->psz_mime, "image/x-portable-pixmap" ) ) )   /* PPM */
        {
            type = VLC_FOURCC('p','n','m',' ');
        }
        else if ( !strcmp( p_attach->psz_mime, "image/gif" ) )         /* GIF */
            type = VLC_FOURCC('g','i','f',' ');
        else if ( !strcmp( p_attach->psz_mime, "image/jpeg" ) )        /* JPG, JPEG */
            type = VLC_FOURCC('j','p','e','g');
        else if ( !strcmp( p_attach->psz_mime, "image/pcx" ) )         /* PCX */
            type = VLC_FOURCC('p','c','x',' ');
        else if ( !strcmp( p_attach->psz_mime, "image/png" ) )         /* PNG */
            type = VLC_FOURCC('p','n','g',' ');
        else if ( !strcmp( p_attach->psz_mime, "image/tiff" ) )        /* TIF, TIFF */
            type = VLC_FOURCC('t','i','f','f');
        else if ( !strcmp( p_attach->psz_mime, "image/x-tga" ) )       /* TGA */
            type = VLC_FOURCC('t','g','a',' ');
        else if ( !strcmp( p_attach->psz_mime, "image/x-xpixmap") )    /* XPM */
            type = VLC_FOURCC('x','p','m',' ');

        if( ( type != 0 ) &&
            ( p_attach->i_data > 0 ) &&
            ( p_attach->p_data != NULL ) )
        {
            picture_t         *p_pic = NULL;
            image_handler_t   *p_image;

            p_image = image_HandlerCreate( p_dec );
            if( p_image != NULL )
            {
                block_t   *p_block;

                p_block = block_New( p_image->p_parent, p_attach->i_data );

                if( p_block != NULL )
                {
                    video_format_t     fmt_in;
                    video_format_t     fmt_out;

                    memcpy( p_block->p_buffer, p_attach->p_data, p_attach->i_data );

                    memset( &fmt_in,  0, sizeof( video_format_t));
                    memset( &fmt_out, 0, sizeof( video_format_t));

                    fmt_in.i_chroma  = type;
                    fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');

                    /* Find a suitable decoder module */
                    if( module_Exists( p_dec, "sdl_image" ) )
                    {
                        /* ffmpeg thinks it can handle bmp properly but it can't (at least
                         * not all of them), so use sdl_image if it is available */

                        vlc_value_t val;

                        var_Create( p_dec, "codec", VLC_VAR_MODULE | VLC_VAR_DOINHERIT );
                        val.psz_string = (char*) "sdl_image";
                        var_Set( p_dec, "codec", val );
                    }

                    p_pic = image_Read( p_image, p_block, &fmt_in, &fmt_out );
                    var_Destroy( p_dec, "codec" );
                }

                image_HandlerDelete( p_image );
            }
            if( p_pic )
            {
                image_attach_t *p_picture = malloc( sizeof(image_attach_t) );

                if( p_picture )
                {
                    p_picture->psz_filename = strdup( p_attach->psz_name );
                    p_picture->p_pic = p_pic;

                    TAB_APPEND( p_sys->i_images, p_sys->pp_images, p_picture );
                }
            }
        }
        vlc_input_attachment_Delete( pp_attachments[ k ] );
    }
    free( pp_attachments );

    return VLC_SUCCESS;
}

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static void ParseUSFHeaderTags( decoder_t *p_dec, xml_reader_t *p_xml_reader )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    char *psz_node;
    ssa_style_t *p_style = NULL;
    int i_style_level = 0;
    int i_metadata_level = 0;

    while ( xml_ReaderRead( p_xml_reader ) == 1 )
    {
        switch ( xml_ReaderNodeType( p_xml_reader ) )
        {
            case XML_READER_TEXT:
            case XML_READER_NONE:
                break;
            case XML_READER_ENDELEM:
                psz_node = xml_ReaderName( p_xml_reader );

                if( !psz_node )
                    break;
                switch (i_style_level)
                {
                    case 0:
                        if( !strcasecmp( "metadata", psz_node ) && (i_metadata_level == 1) )
                        {
                            i_metadata_level--;
                        }
                        break;
                    case 1:
                        if( !strcasecmp( "styles", psz_node ) )
                        {
                            i_style_level--;
                        }
                        break;
                    case 2:
                        if( !strcasecmp( "style", psz_node ) )
                        {
                            TAB_APPEND( p_sys->i_ssa_styles, p_sys->pp_ssa_styles, p_style );

                            p_style = NULL;
                            i_style_level--;
                        }
                        break;
                }

                free( psz_node );
                break;
            case XML_READER_STARTELEM:
                psz_node = xml_ReaderName( p_xml_reader );

                if( !psz_node )
                    break;

                if( !strcasecmp( "metadata", psz_node ) && (i_style_level == 0) )
                {
                    i_metadata_level++;
                }
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                else if( !strcasecmp( "resolution", psz_node ) &&
                         ( i_metadata_level == 1) )
624 625 626 627 628 629 630 631 632 633 634 635 636
                {
                    while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
                    {
                        char *psz_name = xml_ReaderName ( p_xml_reader );
                        char *psz_value = xml_ReaderValue ( p_xml_reader );

                        if( psz_name && psz_value )
                        {
                            if( !strcasecmp( "x", psz_name ) )
                                p_sys->i_original_width = atoi( psz_value );
                            else if( !strcasecmp( "y", psz_name ) )
                                p_sys->i_original_height = atoi( psz_value );
                        }
637 638
                        free( psz_name );
                        free( psz_value );
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
                    }
                }
                else if( !strcasecmp( "styles", psz_node ) && (i_style_level == 0) )
                {
                    i_style_level++;
                }
                else if( !strcasecmp( "style", psz_node ) && (i_style_level == 1) )
                {
                    i_style_level++;

                    p_style = calloc( 1, sizeof(ssa_style_t) );
                    if( ! p_style )
                    {
                        msg_Err( p_dec, "out of memory" );
                        free( psz_node );
                        break;
                    }
                    /* All styles are supposed to default to Default, and then
                     * one or more settings are over-ridden.
                     * At the moment this only effects styles defined AFTER
                     * Default in the XML
                     */
                    int i;
                    for( i = 0; i < p_sys->i_ssa_styles; i++ )
                    {
                        if( !strcasecmp( p_sys->pp_ssa_styles[i]->psz_stylename, "Default" ) )
                        {
                            ssa_style_t *p_default_style = p_sys->pp_ssa_styles[i];

                            memcpy( p_style, p_default_style, sizeof( ssa_style_t ) );
                            p_style->font_style.psz_fontname = strdup( p_style->font_style.psz_fontname );
                            p_style->psz_stylename = NULL;
                        }
                    }

                    while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
                    {
                        char *psz_name = xml_ReaderName ( p_xml_reader );
                        char *psz_value = xml_ReaderValue ( p_xml_reader );

                        if( psz_name && psz_value )
                        {
                            if( !strcasecmp( "name", psz_name ) )
                                p_style->psz_stylename = strdup( psz_value);
                        }
684 685
                        free( psz_name );
                        free( psz_value );
686 687 688 689 690 691 692 693 694 695 696 697 698
                    }
                }
                else if( !strcasecmp( "fontstyle", psz_node ) && (i_style_level == 2) )
                {
                    while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
                    {
                        char *psz_name = xml_ReaderName ( p_xml_reader );
                        char *psz_value = xml_ReaderValue ( p_xml_reader );

                        if( psz_name && psz_value )
                        {
                            if( !strcasecmp( "face", psz_name ) )
                            {
699
                                free( p_style->font_style.psz_fontname );
700 701 702 703 704 705 706 707 708
                                p_style->font_style.psz_fontname = strdup( psz_value );
                            }
                            else if( !strcasecmp( "size", psz_name ) )
                            {
                                if( ( *psz_value == '+' ) || ( *psz_value == '-' ) )
                                {
                                    int i_value = atoi( psz_value );

                                    if( ( i_value >= -5 ) && ( i_value <= 5 ) )
709 710
                                        p_style->font_style.i_font_size  +=
                                            ( i_value * p_style->font_style.i_font_size ) / 10;
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
                                    else if( i_value < -5 )
                                        p_style->font_style.i_font_size  = - i_value;
                                    else if( i_value > 5 )
                                        p_style->font_style.i_font_size  = i_value;
                                }
                                else
                                    p_style->font_style.i_font_size  = atoi( psz_value );
                            }
                            else if( !strcasecmp( "italic", psz_name ) )
                            {
                                if( !strcasecmp( "yes", psz_value ))
                                    p_style->font_style.i_style_flags |= STYLE_ITALIC;
                                else
                                    p_style->font_style.i_style_flags &= ~STYLE_ITALIC;
                            }
                            else if( !strcasecmp( "weight", psz_name ) )
                            {
                                if( !strcasecmp( "bold", psz_value ))
                                    p_style->font_style.i_style_flags |= STYLE_BOLD;
                                else
                                    p_style->font_style.i_style_flags &= ~STYLE_BOLD;
                            }
                            else if( !strcasecmp( "underline", psz_name ) )
                            {
                                if( !strcasecmp( "yes", psz_value ))
                                    p_style->font_style.i_style_flags |= STYLE_UNDERLINE;
                                else
                                    p_style->font_style.i_style_flags &= ~STYLE_UNDERLINE;
                            }
                            else if( !strcasecmp( "color", psz_name ) )
                            {
                                if( *psz_value == '#' )
                                {
                                    unsigned long col = strtol(psz_value+1, NULL, 16);
                                    p_style->font_style.i_font_color = (col & 0x00ffffff);
                                    p_style->font_style.i_font_alpha = (col >> 24) & 0xff;
                                }
                            }
                            else if( !strcasecmp( "outline-color", psz_name ) )
                            {
                                if( *psz_value == '#' )
                                {
                                    unsigned long col = strtol(psz_value+1, NULL, 16);
                                    p_style->font_style.i_outline_color = (col & 0x00ffffff);
                                    p_style->font_style.i_outline_alpha = (col >> 24) & 0xff;
                                }
                            }
                            else if( !strcasecmp( "outline-level", psz_name ) )
                            {
                                p_style->font_style.i_outline_width = atoi( psz_value );
                            }
                            else if( !strcasecmp( "shadow-color", psz_name ) )
                            {
                                if( *psz_value == '#' )
                                {
                                    unsigned long col = strtol(psz_value+1, NULL, 16);
                                    p_style->font_style.i_shadow_color = (col & 0x00ffffff);
                                    p_style->font_style.i_shadow_alpha = (col >> 24) & 0xff;
                                }
                            }
                            else if( !strcasecmp( "shadow-level", psz_name ) )
                            {
                                p_style->font_style.i_shadow_width = atoi( psz_value );
                            }
                            else if( !strcasecmp( "back-color", psz_name ) )
                            {
                                if( *psz_value == '#' )
                                {
                                    unsigned long col = strtol(psz_value+1, NULL, 16);
                                    p_style->font_style.i_karaoke_background_color = (col & 0x00ffffff);
                                    p_style->font_style.i_karaoke_background_alpha = (col >> 24) & 0xff;
                                }
                            }
                            else if( !strcasecmp( "spacing", psz_name ) )
                            {
                                p_style->font_style.i_spacing = atoi( psz_value );
                            }
                        }
789 790
                        free( psz_name );
                        free( psz_value );
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
                    }
                }
                else if( !strcasecmp( "position", psz_node ) && (i_style_level == 2) )
                {
                    while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
                    {
                        char *psz_name = xml_ReaderName ( p_xml_reader );
                        char *psz_value = xml_ReaderValue ( p_xml_reader );

                        if( psz_name && psz_value )
                        {
                            if( !strcasecmp( "alignment", psz_name ) )
                            {
                                if( !strcasecmp( "TopLeft", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
                                else if( !strcasecmp( "TopCenter", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_TOP;
                                else if( !strcasecmp( "TopRight", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_RIGHT;
                                else if( !strcasecmp( "MiddleLeft", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_LEFT;
                                else if( !strcasecmp( "MiddleCenter", psz_value ) )
                                    p_style->i_align = 0;
                                else if( !strcasecmp( "MiddleRight", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_RIGHT;
                                else if( !strcasecmp( "BottomLeft", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_LEFT;
                                else if( !strcasecmp( "BottomCenter", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_BOTTOM;
                                else if( !strcasecmp( "BottomRight", psz_value ) )
                                    p_style->i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_RIGHT;
                            }
                            else if( !strcasecmp( "horizontal-margin", psz_name ) )
                            {
                                if( strchr( psz_value, '%' ) )
                                {
                                    p_style->i_margin_h = 0;
                                    p_style->i_margin_percent_h = atoi( psz_value );
                                }
                                else
                                {
                                    p_style->i_margin_h = atoi( psz_value );
                                    p_style->i_margin_percent_h = 0;
                                }
                            }
                            else if( !strcasecmp( "vertical-margin", psz_name ) )
                            {
                                if( strchr( psz_value, '%' ) )
                                {
840 841 842 843 844 845 846 847 848 849
                                    p_style->i_margin_v = 0;
                                    p_style->i_margin_percent_v = atoi( psz_value );
                                }
                                else
                                {
                                    p_style->i_margin_v = atoi( psz_value );
                                    p_style->i_margin_percent_v = 0;
                                }
                            }
                        }
850 851
                        free( psz_name );
                        free( psz_value );
852 853 854
                    }
                }

855 856
                free( psz_node );
                break;
857 858
        }
    }
859
    free( p_style );
860
}
861

862

863

864 865 866
static subpicture_region_t *ParseUSFString( decoder_t *p_dec,
                                            char *psz_subtitle,
                                            subpicture_t *p_spu_in )
867 868 869 870 871
{
    decoder_sys_t        *p_sys = p_dec->p_sys;
    subpicture_t         *p_spu = p_spu_in;
    subpicture_region_t  *p_region_first = NULL;
    subpicture_region_t  *p_region_upto  = p_region_first;
872 873 874 875 876

    while( *psz_subtitle )
    {
        if( *psz_subtitle == '<' )
        {
877
            char *psz_end = NULL;
878

879 880
            if(( !strncasecmp( psz_subtitle, "<text ", 6 )) ||
               ( !strncasecmp( psz_subtitle, "<text>", 6 )))
881
            {
882
                psz_end = strcasestr( psz_subtitle, "</text>" );
883

884
                if( psz_end )
885
                {
886 887 888
                    subpicture_region_t  *p_text_region;

                    psz_end += strcspn( psz_end, ">" ) + 1;
889

890 891 892 893 894
                    p_text_region = CreateTextRegion( p_dec,
                                                      p_spu,
                                                      psz_subtitle,
                                                      psz_end - psz_subtitle,
                                                      p_sys->i_align );
895

896
                    if( p_text_region )
897
                    {
898
                        p_text_region->psz_text = CreatePlainText( p_text_region->psz_html );
899

900
                        if( ! var_CreateGetBool( p_dec, "subsdec-formatted" ) )
901
                        {
902 903
                            free( p_text_region->psz_html );
                            p_text_region->psz_html = NULL;
904
                        }
905
                    }
906

907 908 909 910 911 912 913 914
                    if( !p_region_first )
                    {
                        p_region_first = p_region_upto = p_text_region;
                    }
                    else if( p_text_region )
                    {
                        p_region_upto->p_next = p_text_region;
                        p_region_upto = p_region_upto->p_next;
915
                    }
916
                }
917 918 919 920 921 922 923
            }
            else if(( !strncasecmp( psz_subtitle, "<karaoke ", 9 )) ||
                    ( !strncasecmp( psz_subtitle, "<karaoke>", 9 )))
            {
                psz_end = strcasestr( psz_subtitle, "</karaoke>" );

                if( psz_end )
924
                {
925
                    subpicture_region_t  *p_text_region;
926

927 928 929 930 931 932 933
                    psz_end += strcspn( psz_end, ">" ) + 1;

                    p_text_region = CreateTextRegion( p_dec,
                                                      p_spu,
                                                      psz_subtitle,
                                                      psz_end - psz_subtitle,
                                                      p_sys->i_align );
934

935 936 937
                    if( p_text_region )
                    {
                        if( ! var_CreateGetBool( p_dec, "subsdec-formatted" ) )
938
                        {
939 940
                            free( p_text_region->psz_html );
                            p_text_region->psz_html = NULL;
941
                        }
942
                    }
943
                    if( !p_region_first )
944
                    {
945 946 947 948 949 950
                        p_region_first = p_region_upto = p_text_region;
                    }
                    else if( p_text_region )
                    {
                        p_region_upto->p_next = p_text_region;
                        p_region_upto = p_region_upto->p_next;
951 952 953
                    }
                }
            }
954 955
            else if(( !strncasecmp( psz_subtitle, "<image ", 7 )) ||
                    ( !strncasecmp( psz_subtitle, "<image>", 7 )))
956
            {
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
                subpicture_region_t *p_image_region = NULL;

                char *psz_end = strcasestr( psz_subtitle, "</image>" );
                char *psz_content = strchr( psz_subtitle, '>' );
                int   i_transparent = -1;

                /* If a colorkey parameter is specified, then we have to map
                 * that index in the picture through as transparent (it is
                 * required by the USF spec but is also recommended that if the
                 * creator really wants a transparent colour that they use a
                 * type like PNG that properly supports it; this goes doubly
                 * for VLC because the pictures are stored internally in YUV
                 * and the resulting colour-matching may not produce the
                 * desired results.)
                 */
                char *psz_tmp = GrabAttributeValue( "colorkey", psz_subtitle );
                if( psz_tmp )
974
                {
975 976 977
                    if( *psz_tmp == '#' )
                        i_transparent = strtol( psz_tmp + 1, NULL, 16 ) & 0x00ffffff;
                    free( psz_tmp );
978
                }
979
                if( psz_content && ( psz_content < psz_end ) )
980
                {
981 982 983 984 985 986 987
                    char *psz_filename = strndup( &psz_content[1], psz_end - &psz_content[1] );
                    if( psz_filename )
                    {
                        p_image_region = LoadEmbeddedImage( p_dec, p_spu,
                                            psz_filename, i_transparent );
                        free( psz_filename );
                    }
988
                }
989 990 991 992

                if( psz_end ) psz_end += strcspn( psz_end, ">" ) + 1;

                if( p_image_region )
993
                {
994 995 996 997 998 999
                    SetupPositions( p_image_region, psz_subtitle );

                    p_image_region->p_next   = NULL;
                    p_image_region->psz_text = NULL;
                    p_image_region->psz_html = NULL;

1000
                }
1001
                if( !p_region_first )
1002
                {
1003
                    p_region_first = p_region_upto = p_image_region;
1004
                }
1005
                else if( p_image_region )
1006
                {
1007 1008
                    p_region_upto->p_next = p_image_region;
                    p_region_upto = p_region_upto->p_next;
1009 1010
                }
            }
1011 1012
            if( psz_end )
                psz_subtitle = psz_end - 1;
1013

1014
            psz_subtitle += strcspn( psz_subtitle, ">" );
1015 1016
        }

1017
        psz_subtitle++;
1018 1019
    }

1020
    return p_region_first;
1021
}
1022

1023 1024 1025
/*****************************************************************************
 * ParseUSFHeader: Retrieve global formatting information etc
 *****************************************************************************/
1026
static void ParseUSFHeader( decoder_t *p_dec )
1027
{
1028 1029 1030
    stream_t      *p_sub = NULL;
    xml_t         *p_xml = NULL;
    xml_reader_t  *p_xml_reader = NULL;
1031

1032 1033 1034
    p_sub = stream_MemoryNew( VLC_OBJECT(p_dec),
                              p_dec->fmt_in.p_extra,
                              p_dec->fmt_in.i_extra,
1035
                              true );
1036 1037
    if( !p_sub )
        return;
1038

1039 1040
    p_xml = xml_Create( p_dec );
    if( p_xml )
1041
    {
1042 1043
        p_xml_reader = xml_ReaderCreate( p_xml, p_sub );
        if( p_xml_reader )
1044
        {
1045 1046 1047 1048
            /* Look for Root Node */
            if( xml_ReaderRead( p_xml_reader ) == 1 )
            {
                char *psz_node = xml_ReaderName( p_xml_reader );
1049

1050 1051
                if( !strcasecmp( "usfsubtitles", psz_node ) )
                    ParseUSFHeaderTags( p_dec, p_xml_reader );
1052

1053
                free( psz_node );
1054
            }
1055 1056

            xml_ReaderDelete( p_xml, p_xml_reader );
1057
        }
1058
        xml_Delete( p_xml );
1059
    }
1060
    stream_Delete( p_sub );
1061
}
1062

1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
/* Function now handles tags which has attribute values, and tries
 * to deal with &' commands too. It no longer modifies the string
 * in place, so that the original text can be reused
 */
static char *StripTags( char *psz_subtitle )
{
    char *psz_text_start;
    char *psz_text;

    psz_text = psz_text_start = malloc( strlen( psz_subtitle ) + 1 );
    if( !psz_text_start )
        return NULL;

    while( *psz_subtitle )
    {
        /* Mask out any pre-existing LFs in the subtitle */
        if( *psz_subtitle == '\n' )
            *psz_subtitle = ' ';
1081

1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
        if( *psz_subtitle == '<' )
        {
            if( strncasecmp( psz_subtitle, "<br/>", 5 ) == 0 )
                *psz_text++ = '\n';

            psz_subtitle += strcspn( psz_subtitle, ">" );
        }
        else if( *psz_subtitle == '&' )
        {
            if( !strncasecmp( psz_subtitle, "&lt;", 4 ))
            {
                *psz_text++ = '<';
                psz_subtitle += strcspn( psz_subtitle, ";" );
            }
            else if( !strncasecmp( psz_subtitle, "&gt;", 4 ))
            {
                *psz_text++ = '>';
                psz_subtitle += strcspn( psz_subtitle, ";" );
            }
            else if( !strncasecmp( psz_subtitle, "&amp;", 5 ))
            {
                *psz_text++ = '&';
                psz_subtitle += strcspn( psz_subtitle, ";" );
            }
            else if( !strncasecmp( psz_subtitle, "&quot;", 6 ))
            {
                *psz_text++ = '\"';
                psz_subtitle += strcspn( psz_subtitle, ";" );
            }
            else
            {
                /* Assume it is just a normal ampersand */
                *psz_text++ = '&';
            }
        }
        else
        {
            *psz_text++ = *psz_subtitle;
        }

        psz_subtitle++;
    }
    *psz_text = '\0';
    psz_text_start = realloc( psz_text_start, strlen( psz_text_start ) + 1 );

    return psz_text_start;
}

/* Turn a HTML subtitle, turn into a plain-text version,
 *  complete with sensible whitespace compaction
 */

static char *CreatePlainText( char *psz_subtitle )
{
    char *psz_text = StripTags( psz_subtitle );
    char *s;

    if( !psz_text )
        return NULL;

    s = strpbrk( psz_text, "\t\r\n " );
    while( s )
    {
        int   k;
        char  spc = ' ';
        int   i_whitespace = strspn( s, "\t\r\n " );

        /* Favour '\n' over other whitespaces - if one of these
         * occurs in the whitespace use a '\n' as our value,
         * otherwise just use a ' '
         */
        for( k = 0; k < i_whitespace; k++ )
            if( s[k] == '\n' ) spc = '\n';

        if( i_whitespace > 1 )
        {
            memmove( &s[1],
                     &s[i_whitespace],
                     strlen( s ) - i_whitespace + 1 );
        }
        *s++ = spc;

        s = strpbrk( s, "\t\r\n " );
    }
    return psz_text;
}

/****************************************************************************
 * download and resize image located at psz_url
 ***************************************************************************/
static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec,
                                               subpicture_t *p_spu,
                                               const char *psz_filename,
                                               int i_transparent_color )
{
    decoder_sys_t         *p_sys = p_dec->p_sys;
    subpicture_region_t   *p_region;
    video_format_t         fmt_out;
    int                    k;
    picture_t             *p_pic = NULL;

    for( k = 0; k < p_sys->i_images; k++ )
    {
        if( p_sys->pp_images &&
            !strcmp( p_sys->pp_images[k]->psz_filename, psz_filename ) )
        {
            p_pic = p_sys->pp_images[k]->p_pic;
            break;
        }
    }

    if( !p_pic )
    {
        msg_Err( p_dec, "Unable to read image %s", psz_filename );
        return NULL;
    }

    /* Display the feed's image */
    memset( &fmt_out, 0, sizeof( video_format_t));

    fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
    fmt_out.i_aspect = VOUT_ASPECT_FACTOR;
    fmt_out.i_sar_num = fmt_out.i_sar_den = 1;
    fmt_out.i_width =
        fmt_out.i_visible_width = p_pic->p[Y_PLANE].i_visible_pitch;
    fmt_out.i_height =
        fmt_out.i_visible_height = p_pic->p[Y_PLANE].i_visible_lines;

    p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt_out );
    if( !p_region )
    {
        msg_Err( p_dec, "cannot allocate SPU region" );
        return NULL;
    }
    vout_CopyPicture( p_dec, &p_region->picture, p_pic );

    /* This isn't the best way to do this - if you really want transparency, then
     * you're much better off using an image type that supports it like PNG. The
     * spec requires this support though.
     */
    if( i_transparent_color > 0 )
    {
        uint8_t i_r = ( i_transparent_color >> 16 ) & 0xff;
        uint8_t i_g = ( i_transparent_color >>  8 ) & 0xff;
        uint8_t i_b = ( i_transparent_color       ) & 0xff;
        uint8_t i_y = ( ( (  66 * i_r + 129 * i_g +  25 * i_b + 128 ) >> 8 ) + 16 );
        uint8_t i_u =   ( ( -38 * i_r -  74 * i_g + 112 * i_b + 128 ) >> 8 ) + 128 ;
        uint8_t i_v =   ( ( 112 * i_r -  94 * i_g -  18 * i_b + 128 ) >> 8 ) + 128 ;

        if( ( p_region->picture.Y_PITCH == p_region->picture.U_PITCH ) &&
            ( p_region->picture.Y_PITCH == p_region->picture.V_PITCH ) &&
            ( p_region->picture.Y_PITCH == p_region->picture.A_PITCH ) )
        {
            int i_lines = p_region->picture.p[ Y_PLANE ].i_lines;
            if( i_lines > p_region->picture.p[ U_PLANE ].i_lines )
                i_lines = p_region->picture.p[ U_PLANE ].i_lines;
            if( i_lines > p_region->picture.p[ V_PLANE ].i_lines )
                i_lines = p_region->picture.p[ V_PLANE ].i_lines;
            if( i_lines > p_region->picture.p[ A_PLANE ].i_lines )
                i_lines = p_region->picture.p[ A_PLANE ].i_lines;

            int   i;

            for( i = 0; i < p_region->picture.A_PITCH * i_lines; i++ )
            {
                if(( p_region->picture.Y_PIXELS[ i ] == i_y ) &&
                   ( p_region->picture.U_PIXELS[ i ] == i_u ) &&
                   ( p_region->picture.V_PIXELS[ i ] == i_v ) )
                {
                    p_region->picture.A_PIXELS[ i ] = 1;
                }
            }
        }
    }
    return p_region;
}