subsusf.c 46.4 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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#include <assert.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"));
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    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;

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

    /* Allocate the memory needed to store the decoder's structure */
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    if( ( p_dec->p_sys = p_sys = calloc(1, sizeof(decoder_sys_t)) ) == NULL )
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        return VLC_ENOMEM;
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    p_dec->pf_decode_sub = DecodeBlock;
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    /* 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;
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    p_sys->i_original_height = 0;
    p_sys->i_original_width = 0;
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    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 */

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    p_sys->i_align = var_CreateGetInteger( p_dec, "subsdec-align" );
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    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 )
{
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    subpicture_t *p_spu;
    block_t *p_block;
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    if( !pp_block || *pp_block == NULL )
        return NULL;
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    p_block = *pp_block;
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    p_spu = ParseText( p_dec, p_block );

    block_Release( p_block );
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    *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 )
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                picture_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)
    {
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        msg_Err( p_dec, "USF subtitles must be in UTF-8 format.\n"
                 "This stream contains USF subtitles which aren't." );
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    }

    /* 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;
    }

    /* 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;
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    p_text_region = subpicture_region_New( &fmt );
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    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 )
        {
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            subpicture_region_Delete( p_text_region );
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            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 */
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                    if( module_exists( p_dec, "sdl_image" ) )
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                    {
                        /* 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) )
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                {
                    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 );
                        }
630 631
                        free( psz_name );
                        free( psz_value );
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
                    }
                }
                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 )
                    {
                        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);
                        }
676 677
                        free( psz_name );
                        free( psz_value );
678 679 680 681 682 683 684 685 686 687 688 689 690
                    }
                }
                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 ) )
                            {
691
                                free( p_style->font_style.psz_fontname );
692 693 694 695 696 697 698 699 700
                                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 ) )
701 702
                                        p_style->font_style.i_font_size  +=
                                            ( i_value * p_style->font_style.i_font_size ) / 10;
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
                                    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 );
                            }
                        }
781 782
                        free( psz_name );
                        free( psz_value );
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
                    }
                }
                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, '%' ) )
                                {
832 833 834 835 836 837 838 839 840 841
                                    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;
                                }
                            }
                        }
842 843
                        free( psz_name );
                        free( psz_value );
844 845 846
                    }
                }

847 848
                free( psz_node );
                break;
849 850
        }
    }
851
    free( p_style );
852
}
853

854

855

856 857 858
static subpicture_region_t *ParseUSFString( decoder_t *p_dec,
                                            char *psz_subtitle,
                                            subpicture_t *p_spu_in )
859 860 861 862 863
{
    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;
864 865 866 867 868

    while( *psz_subtitle )
    {
        if( *psz_subtitle == '<' )
        {
869
            char *psz_end = NULL;
870

871 872
            if(( !strncasecmp( psz_subtitle, "<text ", 6 )) ||
               ( !strncasecmp( psz_subtitle, "<text>", 6 )))
873
            {
874
                psz_end = strcasestr( psz_subtitle, "</text>" );
875

876
                if( psz_end )
877
                {
878 879 880
                    subpicture_region_t  *p_text_region;

                    psz_end += strcspn( psz_end, ">" ) + 1;
881

882 883 884 885 886
                    p_text_region = CreateTextRegion( p_dec,
                                                      p_spu,
                                                      psz_subtitle,
                                                      psz_end - psz_subtitle,
                                                      p_sys->i_align );
887

888
                    if( p_text_region )
889
                    {
890
                        p_text_region->psz_text = CreatePlainText( p_text_region->psz_html );
891

892
                        if( ! var_CreateGetBool( p_dec, "subsdec-formatted" ) )
893
                        {
894 895
                            free( p_text_region->psz_html );
                            p_text_region->psz_html = NULL;
896
                        }
897
                    }
898

899 900 901 902 903 904 905 906
                    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;
907
                    }
908
                }
909 910 911 912 913 914 915
            }
            else if(( !strncasecmp( psz_subtitle, "<karaoke ", 9 )) ||
                    ( !strncasecmp( psz_subtitle, "<karaoke>", 9 )))
            {
                psz_end = strcasestr( psz_subtitle, "</karaoke>" );

                if( psz_end )
916
                {
917
                    subpicture_region_t  *p_text_region;
918

919 920 921 922 923 924 925
                    psz_end += strcspn( psz_end, ">" ) + 1;

                    p_text_region = CreateTextRegion( p_dec,
                                                      p_spu,
                                                      psz_subtitle,
                                                      psz_end - psz_subtitle,
                                                      p_sys->i_align );
926

927 928 929
                    if( p_text_region )
                    {
                        if( ! var_CreateGetBool( p_dec, "subsdec-formatted" ) )
930
                        {
931 932
                            free( p_text_region->psz_html );
                            p_text_region->psz_html = NULL;
933
                        }
934
                    }
935
                    if( !p_region_first )
936
                    {
937 938 939 940 941 942
                        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;
943 944 945
                    }
                }
            }
946 947
            else if(( !strncasecmp( psz_subtitle, "<image ", 7 )) ||
                    ( !strncasecmp( psz_subtitle, "<image>", 7 )))
948
            {
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
                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 )
966
                {
967 968 969
                    if( *psz_tmp == '#' )
                        i_transparent = strtol( psz_tmp + 1, NULL, 16 ) & 0x00ffffff;
                    free( psz_tmp );
970
                }
971
                if( psz_content && ( psz_content < psz_end ) )
972
                {
973 974 975 976 977 978 979
                    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 );
                    }
980
                }
981 982 983 984

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

                if( p_image_region )
985
                {
986 987 988 989 990 991
                    SetupPositions( p_image_region, psz_subtitle );

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

992
                }
993
                if( !p_region_first )
994
                {
995
                    p_region_first = p_region_upto = p_image_region;
996
                }
997
                else if( p_image_region )
998
                {
999 1000
                    p_region_upto->p_next = p_image_region;
                    p_region_upto = p_region_upto->p_next;
1001 1002
                }
            }
1003 1004
            if( psz_end )
                psz_subtitle = psz_end - 1;
1005

1006
            psz_subtitle += strcspn( psz_subtitle, ">" );
1007 1008
        }

1009
        psz_subtitle++;
1010 1011
    }

1012
    return p_region_first;
1013
}
1014

1015 1016 1017
/*****************************************************************************
 * ParseUSFHeader: Retrieve global formatting information etc
 *****************************************************************************/
1018
static void ParseUSFHeader( decoder_t *p_dec )
1019
{
1020 1021 1022
    stream_t      *p_sub = NULL;
    xml_t         *p_xml = NULL;
    xml_reader_t  *p_xml_reader = NULL;
1023

1024 1025 1026
    p_sub = stream_MemoryNew( VLC_OBJECT(p_dec),
                              p_dec->fmt_in.p_extra,
                              p_dec->fmt_in.i_extra,
1027
                              true );
1028 1029
    if( !p_sub )
        return;
1030

1031 1032
    p_xml = xml_Create( p_dec );
    if( p_xml )
1033
    {
1034 1035
        p_xml_reader = xml_ReaderCreate( p_xml, p_sub );
        if( p_xml_reader )
1036
        {
1037 1038 1039 1040
            /* Look for Root Node */
            if( xml_ReaderRead( p_xml_reader ) == 1 )
            {
                char *psz_node = xml_ReaderName( p_xml_reader );
1041

1042 1043
                if( !strcasecmp( "usfsubtitles", psz_node ) )
                    ParseUSFHeaderTags( p_dec, p_xml_reader );
1044

1045
                free( psz_node );
1046
            }
1047 1048

            xml_ReaderDelete( p_xml, p_xml_reader );
1049
        }
1050
        xml_Delete( p_xml );
1051
    }
1052
    stream_Delete( p_sub );
1053
}
1054

1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
/* 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 = ' ';
1073

1074 1075 1076 1077 1078 1079 1080 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
        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 =
1198
        fmt_out.i_visible_width = p_pic->format.i_visible_width;
1199
    fmt_out.i_height =
1200
        fmt_out.i_visible_height = p_pic->format.i_visible_height;
1201

1202
    p_region = subpicture_region_New( &fmt_out );
1203 1204 1205 1206 1207
    if( !p_region )
    {
        msg_Err( p_dec, "cannot allocate SPU region" );
        return NULL;
    }
1208
    assert( p_pic->format.i_chroma == VLC_FOURCC('Y','U','V','A') );
1209 1210
    /* FIXME the copy is probably not needed anymore */
    picture_CopyPixels( p_region->p_picture, p_pic );
1211 1212 1213 1214 1215 1216 1217

    /* 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 )
    {
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
        int i_r = ( i_transparent_color >> 16 ) & 0xff;
        int i_g = ( i_transparent_color >>  8 ) & 0xff;
        int i_b = ( i_transparent_color       ) & 0xff;

        /* FIXME it cannot work as the yuv conversion code will probably NOT match
         * this one  */
        int i_y = ( ( (  66 * i_r + 129 * i_g +  25 * i_b + 128 ) >> 8 ) + 16 );
        int i_u =   ( ( -38 * i_r -  74 * i_g + 112 * i_b + 128 ) >> 8 ) + 128 ;
        int i_v =   ( ( 112 * i_r -  94 * i_g -  18 * i_b + 128 ) >> 8 ) + 128 ;

        assert( p_region->fmt.i_chroma == VLC_FOURCC('Y','U','V','A') );
        for( unsigned int y = 0; y < p_region->fmt.i_height; y++ )
1230
        {
1231
            for( unsigned int x = 0; x < p_region->fmt.i_width; x++ )
1232
            {
1233 1234 1235
                if( p_region->p_picture->Y_PIXELS[y*p_region->p_picture->Y_PITCH + x] != i_y ||
                    p_region->p_picture->U_PIXELS[y*p_region->p_picture->U_PITCH + x] != i_u ||
                    p_region->p_picture->V_PIXELS[y*p_region->p_picture->V_PITCH + x] != i_v )
1236
                    continue;
1237
                p_region->p_picture->A_PIXELS[y*p_region->p_picture->A_PITCH + x] = 0;
1238

1239 1240 1241 1242 1243
            }
        }
    }
    return p_region;
}