mosaic.c

video linux conference

    p_bridge = GetBridge( p_filter );
    if ( p_bridge == NULL )
    {
        vlc_mutex_unlock( p_sys->p_lock );
        vlc_mutex_unlock( &p_sys->lock );
        return p_spu;
    }

    if ( p_sys->i_position == 0 ) /* use automatic positioning */
    {
        int i_numpics = p_sys->i_order_length; /* keep slots and all */
        for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
        {
            bridged_es_t *p_es = p_bridge->pp_es[i_index];
            if ( !p_es->b_empty )
            {
                i_numpics ++;
                if( p_sys->i_order_length && p_es->psz_id != 0 )
                {
                    /* We also want to leave slots for images given in
                     * mosaic-order that are not available in p_vout_picture */
                    int i;
                    for( i = 0; i < p_sys->i_order_length ; i++ )
                    {
                        if( !strcmp( p_sys->ppsz_order[i], p_es->psz_id ) )
                        {
                            i_numpics--;
                            break;
                        }
                    }

                }
            }
        }
        p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
        p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
                            i_numpics / p_sys->i_rows :
                            i_numpics / p_sys->i_rows + 1 );
    }

    i_real_index = 0;

    for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
    {
        bridged_es_t *p_es = p_bridge->pp_es[i_index];
        video_format_t fmt_in = {0}, fmt_out = {0};
        picture_t *p_converted;

        if ( p_es->b_empty || p_es->p_picture == NULL )
            continue;

        if ( p_es->p_picture->date + p_sys->i_delay < date )
        {
            if ( p_es->p_picture->p_next != NULL )
            {
                picture_t *p_next = p_es->p_picture->p_next;
                p_es->p_picture->pf_release( p_es->p_picture );
                p_es->p_picture = p_next;
            }
            else if ( p_es->p_picture->date + p_sys->i_delay + BLANK_DELAY <
                        date )
            {
                /* Display blank */
                p_es->p_picture->pf_release( p_es->p_picture );
                p_es->p_picture = NULL;
                p_es->pp_last = &p_es->p_picture;
                continue;
            }
            else
                msg_Dbg( p_filter, "too late picture for %s (" I64Fd ")",
                         p_es->psz_id,
                         date - p_es->p_picture->date - p_sys->i_delay );
        }

        if ( p_sys->i_order_length == 0 )
        {
            i_real_index++;
        }
        else
        {
            int i;
            for ( i = 0; i <= p_sys->i_order_length; i++ )
            {
                if ( i == p_sys->i_order_length ) break;
                if ( strcmp( p_es->psz_id, p_sys->ppsz_order[i] ) == 0 )
                {
                    i_real_index = i;
                    break;
                }
            }
            if ( i == p_sys->i_order_length )
                i_real_index = ++i_greatest_real_index_used;
        }
        i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
        i_col = i_real_index % p_sys->i_cols ;

        if ( !p_sys->b_keep )
        {
            /* Convert the images */
            fmt_in.i_chroma = p_es->p_picture->format.i_chroma;
            fmt_in.i_height = p_es->p_picture->format.i_height;
            fmt_in.i_width = p_es->p_picture->format.i_width;

            fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
            fmt_out.i_width = fmt_in.i_width *
                ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
                  / p_sys->i_cols ) / fmt_in.i_width;
            fmt_out.i_height = fmt_in.i_height *
                ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
                  / p_sys->i_rows ) / fmt_in.i_height;
            if( p_sys->b_ar ) /* keep aspect ratio */
            {
                if( (float)fmt_out.i_width / (float)fmt_out.i_height
                      > (float)fmt_in.i_width / (float)fmt_in.i_height )
                {
                    fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
                                         / fmt_in.i_height;
                }
                else
                {
                    fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
                                        / fmt_in.i_width;
                }
             }

            fmt_out.i_visible_width = fmt_out.i_width;
            fmt_out.i_visible_height = fmt_out.i_height;

            p_converted = image_Convert( p_sys->p_image, p_es->p_picture,
                                         &fmt_in, &fmt_out );
            if( !p_converted )
            {
                msg_Warn( p_filter,
                           "image resizing and chroma conversion failed" );
                continue;
            }
        }
        else
        {
            p_converted = p_es->p_picture;
            p_converted->i_refcount++;
            fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
            fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
            fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
            fmt_out.i_visible_width = fmt_out.i_width;
            fmt_out.i_visible_height = fmt_out.i_height;
        }

        p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
                                          p_converted );
        if( !p_region )
        {
            msg_Err( p_filter, "cannot allocate SPU region" );
            p_filter->pf_sub_buffer_del( p_filter, p_spu );
            vlc_mutex_unlock( &p_sys->lock );
            vlc_mutex_unlock( p_sys->p_lock );
            return p_spu;
        }

        /* HACK ALERT : let's fix the pointers to avoid picture duplication.
         * This is necessary because p_region->picture is not a pointer
         * as it ought to be. */
        if( !p_sys->b_keep )
        {
            free( p_converted );
        }
        else
        {
            /* Keep a pointer to the original picture (and its refcount...). */
            p_region->picture.p_sys = (picture_sys_t *)p_converted;
            p_region->picture.pf_release = MosaicReleasePicture;
        }

        if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
        {
            /* center the video in the dedicated rectangle */
            p_region->i_x = p_sys->i_xoffset
                        + i_col * ( p_sys->i_width / p_sys->i_cols )
                        + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
                        + ( ( ( p_sys->i_width
                                 - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
                            / p_sys->i_cols ) - fmt_out.i_width ) / 2;
            p_region->i_y = p_sys->i_yoffset
                        + i_row * ( p_sys->i_height / p_sys->i_rows )
                        + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
                        + ( ( ( p_sys->i_height
                                 - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
                            / p_sys->i_rows ) - fmt_out.i_height ) / 2;
        }
        else
        {
            /* we don't have to center the video since it takes the
            whole rectangle area */
            p_region->i_x = p_sys->i_xoffset
                            + i_col * ( p_sys->i_width / p_sys->i_cols )
                            + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
            p_region->i_y = p_sys->i_yoffset
                        + i_row * ( p_sys->i_height / p_sys->i_rows )
                        + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
        }

        if( p_region_prev == NULL )
        {
            p_spu->p_region = p_region;
        }
        else
        {
            p_region_prev->p_next = p_region;
        }

        p_region_prev = p_region;
    }

    vlc_mutex_unlock( p_sys->p_lock );
    vlc_mutex_unlock( &p_sys->lock );

    return p_spu;
}

/*****************************************************************************
* Callback to update params on the fly
*****************************************************************************/
static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
                            vlc_value_t oldval, vlc_value_t newval,
                            void *p_data )
{
    filter_sys_t *p_sys = (filter_sys_t *) p_data;
    if( !strcmp( psz_var, "mosaic-alpha" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
                         p_sys->i_alpha, newval.i_int);
        p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-height" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing height from %dpx to %dpx",
                          p_sys->i_height, newval.i_int );
        p_sys->i_height = __MAX( newval.i_int, 0 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-width" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing width from %dpx to %dpx",
                         p_sys->i_width, newval.i_int );
        p_sys->i_width = __MAX( newval.i_int, 0 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-xoffset" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
                         p_sys->i_xoffset, newval.i_int );
        p_sys->i_xoffset = __MAX( newval.i_int, 0 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-yoffset" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
                         p_sys->i_yoffset, newval.i_int );
        p_sys->i_yoffset = __MAX( newval.i_int, 0 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-align" ) )
    {
        int i_old = 0, i_new = 0;
        vlc_mutex_lock( &p_sys->lock );
        newval.i_int = __MIN( __MAX( newval.i_int, 0 ), 10 );
        if( newval.i_int == 3 || newval.i_int == 7 )
            newval.i_int = 5;
        while( pi_align_values[i_old] != p_sys->i_align ) i_old++;
        while( pi_align_values[i_new] != newval.i_int ) i_new++;
        msg_Dbg( p_this, "Changing alignment from %d (%s) to %d (%s)",
                     p_sys->i_align, ppsz_align_descriptions[i_old],
                     newval.i_int, ppsz_align_descriptions[i_new] );
        p_sys->i_align = newval.i_int;
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-vborder" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
                         p_sys->i_vborder, newval.i_int );
        p_sys->i_vborder = __MAX( newval.i_int, 0 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-hborder" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
                         p_sys->i_vborder, newval.i_int );
        p_sys->i_hborder = __MAX( newval.i_int, 0 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-position" ) )
    {
        if( newval.i_int > 1 || newval.i_int < 0 )
        {
            msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
        }
        else
        {
            vlc_mutex_lock( &p_sys->lock );
            msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
                             p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
                             newval.i_int, ppsz_pos_descriptions[newval.i_int]);
            p_sys->i_position = newval.i_int;
            vlc_mutex_unlock( &p_sys->lock );
        }
    }
    else if( !strcmp( psz_var, "mosaic-rows" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing number of rows from %d to %d",
                         p_sys->i_rows, newval.i_int );
        p_sys->i_rows = __MAX( newval.i_int, 1 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-cols" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        msg_Dbg( p_this, "Changing number of columns from %d to %d",
                         p_sys->i_cols, newval.i_int );
        p_sys->i_cols = __MAX( newval.i_int, 1 );
        vlc_mutex_unlock( &p_sys->lock );
    }
    else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
    {
        vlc_mutex_lock( &p_sys->lock );
        if( newval.i_int )
        {
            msg_Dbg( p_this, "Keep aspect ratio" );
            p_sys->b_ar = 1;
        }
        else
        {
            msg_Dbg( p_this, "Don't keep aspect ratio" );
            p_sys->b_ar = 0;
        }
        vlc_mutex_unlock( &p_sys->lock );
    }
    return VLC_SUCCESS;
}