vout_subpictures.c

video linux conference

}

/**
 * Allocate a subpicture in the spu heap.
 *
 * This function create a reserved subpicture in the spu heap.
 * A null pointer is returned if the function fails. This method provides an
 * already allocated zone of memory in the spu data fields. It needs locking
 * since several pictures can be created by several producers threads.
 * \param p_spu the subpicture unit in which to create the subpicture
 * \return NULL on error, a reserved subpicture otherwise
 */
subpicture_t *spu_CreateSubpicture( spu_t *p_spu )
{
    int                 i_subpic;                        /* subpicture index */
    subpicture_t *      p_subpic = NULL;            /* first free subpicture */

    /* Get lock */
    vlc_mutex_lock( &p_spu->subpicture_lock );

    /*
     * Look for an empty place
     */
    p_subpic = NULL;
    for( i_subpic = 0; i_subpic < VOUT_MAX_SUBPICTURES; i_subpic++ )
    {
        if( p_spu->p_subpicture[i_subpic].i_status == FREE_SUBPICTURE )
        {
            /* Subpicture is empty and ready for allocation */
            p_subpic = &p_spu->p_subpicture[i_subpic];
            p_spu->p_subpicture[i_subpic].i_status = RESERVED_SUBPICTURE;
            break;
        }
    }

    /* If no free subpicture could be found */
    if( p_subpic == NULL )
    {
        msg_Err( p_spu, "subpicture heap is full" );
        vlc_mutex_unlock( &p_spu->subpicture_lock );
        return NULL;
    }

    /* Copy subpicture information, set some default values */
    memset( p_subpic, 0, sizeof(subpicture_t) );
    p_subpic->i_status   = RESERVED_SUBPICTURE;
    p_subpic->b_absolute = VLC_TRUE;
    p_subpic->b_fade     = VLC_FALSE;
    p_subpic->i_alpha    = 0xFF;
    p_subpic->p_region   = 0;
    p_subpic->pf_render  = 0;
    p_subpic->pf_destroy = 0;
    p_subpic->p_sys      = 0;
    vlc_mutex_unlock( &p_spu->subpicture_lock );

    p_subpic->pf_create_region = __spu_CreateRegion;
    p_subpic->pf_make_region = __spu_MakeRegion;
    p_subpic->pf_destroy_region = __spu_DestroyRegion;
    
    return p_subpic;
}

/**
 * Remove a subpicture from the heap
 *
 * This function frees a previously reserved subpicture.
 * It is meant to be used when the construction of a picture aborted.
 * This function does not need locking since reserved subpictures are ignored
 * by the spu.
 */
void spu_DestroySubpicture( spu_t *p_spu, subpicture_t *p_subpic )
{
    /* Get lock */
    vlc_mutex_lock( &p_spu->subpicture_lock );

    /* There can be race conditions so we need to check the status */
    if( p_subpic->i_status == FREE_SUBPICTURE )
    {
        vlc_mutex_unlock( &p_spu->subpicture_lock );
        return;
    }

    /* Check if status is valid */
    if( ( p_subpic->i_status != RESERVED_SUBPICTURE )
           && ( p_subpic->i_status != READY_SUBPICTURE ) )
    {
        msg_Err( p_spu, "subpicture %p has invalid status %d",
                         p_subpic, p_subpic->i_status );
    }

    while( p_subpic->p_region )
    {
        subpicture_region_t *p_region = p_subpic->p_region;
        p_subpic->p_region = p_region->p_next;
        spu_DestroyRegion( p_spu, p_region );
    }

    if( p_subpic->pf_destroy )
    {
        p_subpic->pf_destroy( p_subpic );
    }

    p_subpic->i_status = FREE_SUBPICTURE;

    vlc_mutex_unlock( &p_spu->subpicture_lock );
}

/*****************************************************************************
 * spu_RenderSubpictures: render a subpicture list
 *****************************************************************************
 * This function renders all sub picture units in the list.
 *****************************************************************************/
void spu_RenderSubpictures( spu_t *p_spu, video_format_t *p_fmt,
                            picture_t *p_pic_dst, picture_t *p_pic_src,
                            subpicture_t *p_subpic,
                            int i_scale_width_orig, int i_scale_height_orig )
{
    /* Get lock */
    vlc_mutex_lock( &p_spu->subpicture_lock );

    /* Check i_status again to make sure spudec hasn't destroyed the subpic */
    while( p_subpic != NULL && p_subpic->i_status != FREE_SUBPICTURE )
    {
        subpicture_region_t *p_region = p_subpic->p_region;
        int i_scale_width, i_scale_height;
        int i_subpic_x = p_subpic->i_x;

        /* Load the blending module */
        if( !p_spu->p_blend && p_region )
        {
            p_spu->p_blend = vlc_object_create( p_spu, VLC_OBJECT_FILTER );
            vlc_object_attach( p_spu->p_blend, p_spu );
            p_spu->p_blend->fmt_out.video.i_x_offset =
                p_spu->p_blend->fmt_out.video.i_y_offset = 0;
            p_spu->p_blend->fmt_out.video.i_aspect = p_fmt->i_aspect;
            p_spu->p_blend->fmt_out.video.i_chroma = p_fmt->i_chroma;
            p_spu->p_blend->fmt_in.video.i_chroma = VLC_FOURCC('Y','U','V','P');

            p_spu->p_blend->p_module =
                module_Need( p_spu->p_blend, "video blending", 0, 0 );
        }

        /* Load the text rendering module */
        if( !p_spu->p_text && p_region )
        {
            p_spu->p_text = vlc_object_create( p_spu, VLC_OBJECT_FILTER );
            vlc_object_attach( p_spu->p_text, p_spu );

            p_spu->p_text->fmt_out.video.i_width =
                p_spu->p_text->fmt_out.video.i_visible_width =
                    p_fmt->i_width;
            p_spu->p_text->fmt_out.video.i_height =
                p_spu->p_text->fmt_out.video.i_visible_height =
                    p_fmt->i_height;

            p_spu->p_text->pf_sub_buffer_new = spu_new_buffer;
            p_spu->p_text->pf_sub_buffer_del = spu_del_buffer;
            p_spu->p_text->p_module =
                module_Need( p_spu->p_text, "text renderer", 0, 0 );
        }
        else if( p_region )
        {
            p_spu->p_text->fmt_out.video.i_width =
                p_spu->p_text->fmt_out.video.i_visible_width =
                    p_fmt->i_width;
            p_spu->p_text->fmt_out.video.i_height =
                p_spu->p_text->fmt_out.video.i_visible_height =
                    p_fmt->i_height;
        }

        i_scale_width = i_scale_width_orig;
        i_scale_height = i_scale_height_orig;

        if( p_subpic->i_original_picture_width &&
            p_subpic->i_original_picture_height )
        {
            i_scale_width = i_scale_width * p_fmt->i_width /
                             p_subpic->i_original_picture_width;
            i_scale_height = i_scale_height * p_fmt->i_height /
                             p_subpic->i_original_picture_height;
        }

        /* Set default subpicture aspect ratio */
        if( p_region && p_region->fmt.i_aspect &&
            (!p_region->fmt.i_sar_num || !p_region->fmt.i_sar_den) )
        {
            p_region->fmt.i_sar_den = p_region->fmt.i_aspect;
            p_region->fmt.i_sar_num = VOUT_ASPECT_FACTOR;
        }
        if( p_region &&
            (!p_region->fmt.i_sar_num || !p_region->fmt.i_sar_den) )
        {
            p_region->fmt.i_sar_den = p_fmt->i_sar_den;
            p_region->fmt.i_sar_num = p_fmt->i_sar_num;
        }

        /* Take care of the aspect ratio */
        if( p_region && p_region->fmt.i_sar_num * p_fmt->i_sar_den !=
            p_region->fmt.i_sar_den * p_fmt->i_sar_num )
        {
            i_scale_width = i_scale_width *
                (int64_t)p_region->fmt.i_sar_num * p_fmt->i_sar_den /
                p_region->fmt.i_sar_den / p_fmt->i_sar_num;
            i_subpic_x = p_subpic->i_x * i_scale_width / 1000;
        }

        /* Load the scaling module */
        if( !p_spu->p_scale && (i_scale_width != 1000 ||
            i_scale_height != 1000) )
        {
            p_spu->p_scale = vlc_object_create( p_spu, VLC_OBJECT_FILTER );
            vlc_object_attach( p_spu->p_scale, p_spu );
            p_spu->p_scale->fmt_out.video.i_chroma =
                p_spu->p_scale->fmt_in.video.i_chroma =
                    VLC_FOURCC('Y','U','V','P');
            p_spu->p_scale->fmt_in.video.i_width =
                p_spu->p_scale->fmt_in.video.i_height = 32;
            p_spu->p_scale->fmt_out.video.i_width =
                p_spu->p_scale->fmt_out.video.i_height = 16;

            p_spu->p_scale->pf_vout_buffer_new = spu_new_video_buffer;
            p_spu->p_scale->pf_vout_buffer_del = spu_del_video_buffer;
            p_spu->p_scale->p_module =
                module_Need( p_spu->p_scale, "video filter2", 0, 0 );
        }

        while( p_region && p_spu->p_blend && p_spu->p_blend->pf_video_blend )
        {
            int i_fade_alpha = 255;
            int i_x_offset = p_region->i_x + i_subpic_x;
            int i_y_offset = p_region->i_y + p_subpic->i_y;

            if( p_region->fmt.i_chroma == VLC_FOURCC('T','E','X','T') )
            {
                if( p_spu->p_text && p_spu->p_text->p_module &&
                    p_spu->p_text->pf_render_text )
                {
                    p_region->i_text_align = p_subpic->i_flags & 0x3;
                    p_spu->p_text->pf_render_text( p_spu->p_text,
                                                   p_region, p_region ); 
                }
            }

            /* Force palette if requested */
            if( p_spu->b_force_palette && VLC_FOURCC('Y','U','V','P') ==
                p_region->fmt.i_chroma )
            {
                memcpy( p_region->fmt.p_palette->palette,
                        p_spu->palette, 16 );
            }

            /* Scale SPU if necessary */
            if( p_region->p_cache )
            {
                if( i_scale_width * p_region->fmt.i_width / 1000 !=
                    p_region->p_cache->fmt.i_width ||
                    i_scale_height * p_region->fmt.i_height / 1000 !=
                    p_region->p_cache->fmt.i_height )
                {
                    p_subpic->pf_destroy_region( VLC_OBJECT(p_spu),
                                                 p_region->p_cache );
                    p_region->p_cache = 0;
                }
            }

            if( (i_scale_width != 1000 || i_scale_height != 1000) &&
                p_spu->p_scale && !p_region->p_cache )
            {
                picture_t *p_pic;

                p_spu->p_scale->fmt_in.video = p_region->fmt;
                p_spu->p_scale->fmt_out.video = p_region->fmt;

                p_region->p_cache =
                    p_subpic->pf_create_region( VLC_OBJECT(p_spu),
                        &p_spu->p_scale->fmt_out.video );
                if( p_spu->p_scale->fmt_out.video.p_palette )
                    *p_spu->p_scale->fmt_out.video.p_palette =
                        *p_region->fmt.p_palette;
                p_region->p_cache->p_next = p_region->p_next;

                vout_CopyPicture( p_spu, &p_region->p_cache->picture,
                                  &p_region->picture );

                p_spu->p_scale->fmt_out.video.i_width =
                    p_region->fmt.i_width * i_scale_width / 1000;
                p_spu->p_scale->fmt_out.video.i_visible_width =
                    p_region->fmt.i_visible_width * i_scale_width / 1000;
                p_spu->p_scale->fmt_out.video.i_height =
                    p_region->fmt.i_height * i_scale_height / 1000;
                p_spu->p_scale->fmt_out.video.i_visible_height =
                    p_region->fmt.i_visible_height * i_scale_height / 1000;
                p_region->p_cache->fmt = p_spu->p_scale->fmt_out.video;
                p_region->p_cache->i_x = p_region->i_x * i_scale_width / 1000;
                p_region->p_cache->i_y = p_region->i_y * i_scale_height / 1000;

                p_pic = p_spu->p_scale->pf_video_filter(
                                 p_spu->p_scale, &p_region->p_cache->picture );
                if( p_pic )
                {
                    picture_t p_pic_tmp = p_region->p_cache->picture;
                    p_region->p_cache->picture = *p_pic;
                    *p_pic = p_pic_tmp;
                    free( p_pic );
                }
            }
            if( (i_scale_width != 1000 || i_scale_height != 1000) &&
                p_spu->p_scale && p_region->p_cache )
            {
                p_region = p_region->p_cache;
            }

            if( p_subpic->i_flags & SUBPICTURE_ALIGN_BOTTOM )
            {
                i_y_offset = p_fmt->i_height - p_region->fmt.i_height -
                    p_subpic->i_y;
            }
            else if ( !(p_subpic->i_flags & SUBPICTURE_ALIGN_TOP) )
            {
                i_y_offset = p_fmt->i_height / 2 - p_region->fmt.i_height / 2;
            }

            if( p_subpic->i_flags & SUBPICTURE_ALIGN_RIGHT )
            {
                i_x_offset = p_fmt->i_width - p_region->fmt.i_width -
                    i_subpic_x;
            }
            else if ( !(p_subpic->i_flags & SUBPICTURE_ALIGN_LEFT) )
            {
                i_x_offset = p_fmt->i_width / 2 - p_region->fmt.i_width / 2;
            }

            if( p_subpic->b_absolute )
            {
                i_x_offset = p_region->i_x +
                    i_subpic_x * i_scale_width / 1000;
                i_y_offset = p_region->i_y +
                    p_subpic->i_y * i_scale_height / 1000;

                if( p_spu->i_margin >= 0 )
                {
                    if( p_subpic->i_height + (unsigned int)p_spu->i_margin <=
                        p_fmt->i_height )
                    {
                        i_y_offset = p_fmt->i_height -
                            p_spu->i_margin - p_subpic->i_height;
                    }
                }
            }

            p_spu->p_blend->fmt_in.video = p_region->fmt;

            /* Force cropping if requested */
            if( p_spu->b_force_crop )
            {
                video_format_t *p_fmt = &p_spu->p_blend->fmt_in.video;
                int i_crop_x = p_spu->i_crop_x * i_scale_width / 1000;