logo.c

video linux conference

    DEL_PARENT_CALLBACKS( SendEventsToChild );

    if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
    free( p_sys );
}

/*****************************************************************************
 * Render: render the logo onto the video
 *****************************************************************************/
static void Render( vout_thread_t *p_vout, picture_t *p_pic )
{
    vout_sys_t *p_sys = p_vout->p_sys;
    picture_t *p_outpic;

    /* This is a new frame. Get a structure from the video_output. */
    while( !(p_outpic = vout_CreatePicture( p_sys->p_vout, 0, 0, 0 )) )
    {
        if( p_vout->b_die || p_vout->b_error ) return;
        msleep( VOUT_OUTMEM_SLEEP );
    }

    vout_CopyPicture( p_vout, p_outpic, p_pic );
    vout_DatePicture( p_sys->p_vout, p_outpic, p_pic->date );

    p_sys->p_blend->pf_video_blend( p_sys->p_blend, p_outpic, p_outpic,
                                    p_sys->p_pic, p_sys->posx, p_sys->posy,
                                    p_sys->i_trans );

    vout_DisplayPicture( p_sys->p_vout, p_outpic );
}

/*****************************************************************************
 * SendEvents: forward mouse and keyboard events to the parent p_vout
 *****************************************************************************/
static int SendEvents( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    var_Set( (vlc_object_t *)p_data, psz_var, newval );
    return VLC_SUCCESS;
}

/*****************************************************************************
 * MouseEvent: callback for mouse events
 *****************************************************************************/
static int MouseEvent( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    vout_thread_t *p_vout = (vout_thread_t*)p_data;
    vout_sys_t *p_sys = p_vout->p_sys;
    vlc_value_t valb;
    int i_delta;

    var_Get( p_vout->p_sys->p_vout, "mouse-button-down", &valb );

    i_delta = newval.i_int - oldval.i_int;

    if( (valb.i_int & 0x1) == 0 )
    {
        return VLC_SUCCESS;
    }

    if( psz_var[6] == 'x' )
    {
        vlc_value_t valy;
        var_Get( p_vout->p_sys->p_vout, "mouse-y", &valy );
        if( newval.i_int >= (int)p_sys->posx &&
            valy.i_int >= (int)p_sys->posy &&
            newval.i_int <= (int)(p_sys->posx + p_sys->i_width) &&
            valy.i_int <= (int)(p_sys->posy + p_sys->i_height) )
        {
            p_sys->posx = __MIN( __MAX( p_sys->posx + i_delta, 0 ),
                          p_vout->output.i_width - p_sys->i_width );
        }
    }
    else if( psz_var[6] == 'y' )
    {
        vlc_value_t valx;
        var_Get( p_vout->p_sys->p_vout, "mouse-x", &valx );
        if( valx.i_int >= (int)p_sys->posx &&
            newval.i_int >= (int)p_sys->posy &&
            valx.i_int <= (int)(p_sys->posx + p_sys->i_width) &&
            newval.i_int <= (int)(p_sys->posy + p_sys->i_height) )
        {
            p_sys->posy = __MIN( __MAX( p_sys->posy + i_delta, 0 ),
                          p_vout->output.i_height - p_sys->i_height );
        }
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Control: control facility for the vout (forwards to child vout)
 *****************************************************************************/
static int Control( vout_thread_t *p_vout, int i_query, va_list args )
{
    return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
}

/*****************************************************************************
 * SendEventsToChild: forward events to the child/children vout
 *****************************************************************************/
static int SendEventsToChild( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    var_Set( p_vout->p_sys->p_vout, psz_var, newval );
    return VLC_SUCCESS;
}

/*****************************************************************************
 * filter_sys_t: logo filter descriptor
 *****************************************************************************/
struct filter_sys_t
{
    picture_t *p_pic;

    int i_width, i_height;
    int pos, posx, posy;
    char *psz_filename;
    int i_trans;
    
    vlc_bool_t b_absolute;

    mtime_t i_last_date;

    /* On the fly control variable */
    vlc_bool_t b_need_update;
    vlc_bool_t b_new_image;
};

static subpicture_t *Filter( filter_t *, mtime_t );

/*****************************************************************************
 * CreateFilter: allocates logo video filter
 *****************************************************************************/
static int CreateFilter( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
    filter_sys_t *p_sys;
    vlc_object_t *p_input;

    /* Allocate structure */
    p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
    if( p_sys == NULL )
    {
        msg_Err( p_filter, "out of memory" );
        return VLC_ENOMEM;
    }

    /* Hook used for callback variables */
    p_input = vlc_object_find( p_this, VLC_OBJECT_INPUT, FIND_PARENT );
    if( !p_input )
    {
        free( p_sys );
        return VLC_ENOOBJ;
    }

    p_sys->psz_filename =
        var_CreateGetString( p_input->p_libvlc , "logo-file" ); 
    if( !p_sys->psz_filename || !*p_sys->psz_filename )
    {
        msg_Err( p_this, "logo file not specified" );
        vlc_object_release( p_input );
        if( p_sys->psz_filename ) free( p_sys->psz_filename );
        free( p_sys );
        return VLC_EGENERIC;
    }

    p_sys->posx = var_CreateGetInteger( p_input->p_libvlc , "logo-x" );
    p_sys->posy = var_CreateGetInteger( p_input->p_libvlc , "logo-y" );
    p_sys->pos = var_CreateGetInteger( p_input->p_libvlc , "logo-position" );
    p_sys->i_trans =
        var_CreateGetInteger( p_input->p_libvlc, "logo-transparency");
    p_sys->i_trans = __MAX( __MIN( p_sys->i_trans, 255 ), 0 );

    var_AddCallback( p_input->p_libvlc, "logo-file", LogoCallback, p_sys );
    var_AddCallback( p_input->p_libvlc, "logo-x", LogoCallback, p_sys );
    var_AddCallback( p_input->p_libvlc, "logo-y", LogoCallback, p_sys );
    var_AddCallback( p_input->p_libvlc, "logo-position", LogoCallback, p_sys );
    var_AddCallback( p_input->p_libvlc, "logo-transparency", LogoCallback, p_sys );
    vlc_object_release( p_input );

    p_sys->p_pic = LoadImage( p_this, p_sys->psz_filename );
    if( !p_sys->p_pic )
    {
        free( p_sys );
        msg_Err( p_this, "couldn't load logo file" );
        return VLC_EGENERIC;
    }

    /* Misc init */
    p_filter->pf_sub_filter = Filter;
    p_sys->i_width = p_sys->p_pic->p[Y_PLANE].i_visible_pitch;
    p_sys->i_height = p_sys->p_pic->p[Y_PLANE].i_visible_lines;
    p_sys->b_need_update = VLC_TRUE;
    p_sys->b_new_image = VLC_FALSE;
    p_sys->i_last_date = 0;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DestroyFilter: destroy logo video filter
 *****************************************************************************/
static void DestroyFilter( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
    filter_sys_t *p_sys = p_filter->p_sys;
    vlc_object_t *p_input;

    if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
    if( p_sys->psz_filename ) free( p_sys->psz_filename );
    free( p_sys );

    /* Delete the logo variables from INPUT */
    p_input = vlc_object_find( p_this, VLC_OBJECT_INPUT, FIND_PARENT );
    if( !p_input ) return;

    var_Destroy( p_input->p_libvlc , "logo-file" );
    var_Destroy( p_input->p_libvlc , "logo-x" );
    var_Destroy( p_input->p_libvlc , "logo-y" );
    var_Destroy( p_input->p_libvlc , "logo-position" );
    var_Destroy( p_input->p_libvlc , "logo-transparency" );
    vlc_object_release( p_input );
}

/*****************************************************************************
 * Filter: the whole thing
 *****************************************************************************
 * This function outputs subpictures at regular time intervals.
 *****************************************************************************/
static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
{
    filter_sys_t *p_sys = p_filter->p_sys;
    subpicture_t *p_spu;
    subpicture_region_t *p_region;
    video_format_t fmt;

    if( !p_sys->b_need_update && p_sys->i_last_date +5000000 > date ) return 0;

    if( p_sys->b_new_image )
    {
        if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );

        p_sys->p_pic = LoadImage( VLC_OBJECT(p_filter), p_sys->psz_filename );
        if( p_sys->p_pic )
        {
            p_sys->i_width = p_sys->p_pic->p[Y_PLANE].i_visible_pitch;
            p_sys->i_height = p_sys->p_pic->p[Y_PLANE].i_visible_lines;
        }

        p_sys->b_new_image = VLC_FALSE;
    }

    p_sys->b_need_update = VLC_FALSE;

    /* Allocate the subpicture internal data. */
    p_spu = p_filter->pf_sub_buffer_new( p_filter );
    if( !p_spu ) return NULL;

    p_spu->b_absolute = p_sys->b_absolute;
    p_spu->i_start = p_sys->i_last_date = date;
    p_spu->i_stop = 0;
    p_spu->b_ephemer = VLC_TRUE;

    p_sys->b_need_update = VLC_FALSE;

    if( !p_sys->p_pic || !p_sys->i_trans )
    {
        /* Send an empty subpicture to clear the display */
        return p_spu;
    }

    /* Create new SPU region */
    memset( &fmt, 0, sizeof(video_format_t) );
    fmt.i_chroma = VLC_FOURCC('Y','U','V','A');
    fmt.i_aspect = VOUT_ASPECT_FACTOR;
    fmt.i_sar_num = fmt.i_sar_den = 1;
    fmt.i_width = fmt.i_visible_width = p_sys->i_width;
    fmt.i_height = fmt.i_visible_height = p_sys->i_height;
    fmt.i_x_offset = fmt.i_y_offset = 0;
    p_region = p_spu->pf_create_region( VLC_OBJECT(p_filter), &fmt );
    if( !p_region )
    {
        msg_Err( p_filter, "cannot allocate SPU region" );
        p_filter->pf_sub_buffer_del( p_filter, p_spu );
        return NULL;
    }

    vout_CopyPicture( p_filter, &p_region->picture, p_sys->p_pic );

    /*  where to locate the logo: */
    if( p_sys->posx < 0 || p_sys->posy < 0 )
    {   /* set to one of the 9 relative locations */
        p_spu->i_flags = p_sys->pos;
        p_spu->i_x = 0;
        p_spu->i_y = 0;
        p_spu->b_absolute = VLC_FALSE;
    }
    else
    {   /*  set to an absolute xy, referenced to upper left corner */
	    p_spu->i_flags = OSD_ALIGN_LEFT | OSD_ALIGN_TOP;
        p_spu->i_x = p_sys->posx;
        p_spu->i_y = p_sys->posy;
        p_spu->b_absolute = VLC_TRUE;
    }

    p_spu->p_region = p_region;
    p_spu->i_alpha = p_sys->i_trans;

    return p_spu;
}

/*****************************************************************************
 * Callback to update params on the fly
 *****************************************************************************/
static int LogoCallback( 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( !strncmp( psz_var, "logo-file", 6 ) )
    {
        if( p_sys->psz_filename ) free( p_sys->psz_filename );
        p_sys->psz_filename = strdup( newval.psz_string ); 
        p_sys->b_new_image = VLC_TRUE;
    }
    else if ( !strncmp( psz_var, "logo-x", 6 ) )
    {
        p_sys->posx = newval.i_int;
    }
    else if ( !strncmp( psz_var, "logo-y", 6 ) )
    {
        p_sys->posy = newval.i_int;
    }
    else if ( !strncmp( psz_var, "logo-position", 12 ) )
    {
        p_sys->pos = newval.i_int;
    }
    else if ( !strncmp( psz_var, "logo-transparency", 9 ) )
    {
        p_sys->i_trans = __MAX( __MIN( newval.i_int, 255 ), 0 );
    }
    p_sys->b_need_update = VLC_TRUE;
    return VLC_SUCCESS;
}