vout_pictures.c

video linux conference

                return PP_OUTPUTPICTURE[0];
            }

            /* No subtitles, picture is in a directbuffer so
             * we can display it directly even if it is still
             * in use. */
            return p_pic;
        }

        /* Picture is in a direct buffer but isn't used by the
         * decoder. We can safely render subtitles on it and
         * display it. */
        spu_RenderSubpictures( p_vout->p_spu, &p_vout->fmt_out, p_pic, p_pic,
                               p_subpic, i_scale_width, i_scale_height );

        return p_pic;
    }

    /* Not a direct buffer. We either need to copy it to a direct buffer,
     * or render it if the chroma isn't the same. */
    if( p_vout->b_direct )
    {
        /* Picture is not in a direct buffer, but is exactly the
         * same size as the direct buffers. A memcpy() is enough,
         * then render the subtitles. */

        if( PP_OUTPUTPICTURE[0]->pf_lock )
            if( PP_OUTPUTPICTURE[0]->pf_lock( p_vout, PP_OUTPUTPICTURE[0] ) )
                return NULL;

        vout_CopyPicture( p_vout, PP_OUTPUTPICTURE[0], p_pic );
        spu_RenderSubpictures( p_vout->p_spu, &p_vout->fmt_out,
                               PP_OUTPUTPICTURE[0], p_pic,
                               p_subpic, i_scale_width, i_scale_height );

        if( PP_OUTPUTPICTURE[0]->pf_unlock )
            PP_OUTPUTPICTURE[0]->pf_unlock( p_vout, PP_OUTPUTPICTURE[0] );

        return PP_OUTPUTPICTURE[0];
    }

    /* Picture is not in a direct buffer, and needs to be converted to
     * another size/chroma. Then the subtitles need to be rendered as
     * well. This usually means software YUV, or hardware YUV with a
     * different chroma. */

    if( p_subpic != NULL && p_vout->p_picture[0].b_slow )
    {
        /* The picture buffer is in slow memory. We'll use
         * the "2 * VOUT_MAX_PICTURES + 1" picture as a temporary
         * one for subpictures rendering. */
        picture_t *p_tmp_pic = &p_vout->p_picture[2 * VOUT_MAX_PICTURES];
        if( p_tmp_pic->i_status == FREE_PICTURE )
        {
            vout_AllocatePicture( VLC_OBJECT(p_vout),
                                  p_tmp_pic, p_vout->fmt_out.i_chroma,
                                  p_vout->fmt_out.i_width,
                                  p_vout->fmt_out.i_height,
                                  p_vout->fmt_out.i_aspect );
            p_tmp_pic->i_type = MEMORY_PICTURE;
            p_tmp_pic->i_status = RESERVED_PICTURE;
        }

        /* Convert image to the first direct buffer */
        p_vout->chroma.pf_convert( p_vout, p_pic, p_tmp_pic );

        /* Render subpictures on the first direct buffer */
        spu_RenderSubpictures( p_vout->p_spu, &p_vout->fmt_out, p_tmp_pic,
                               p_tmp_pic, p_subpic,
                               i_scale_width, i_scale_height );

        if( p_vout->p_picture[0].pf_lock )
            if( p_vout->p_picture[0].pf_lock( p_vout, &p_vout->p_picture[0] ) )
                return NULL;

        vout_CopyPicture( p_vout, &p_vout->p_picture[0], p_tmp_pic );
    }
    else
    {
        if( p_vout->p_picture[0].pf_lock )
            if( p_vout->p_picture[0].pf_lock( p_vout, &p_vout->p_picture[0] ) )
                return NULL;

        /* Convert image to the first direct buffer */
        p_vout->chroma.pf_convert( p_vout, p_pic, &p_vout->p_picture[0] );

        /* Render subpictures on the first direct buffer */
        spu_RenderSubpictures( p_vout->p_spu, &p_vout->fmt_out,
                               &p_vout->p_picture[0], &p_vout->p_picture[0],
                               p_subpic, i_scale_width, i_scale_height );
    }

    if( p_vout->p_picture[0].pf_unlock )
        p_vout->p_picture[0].pf_unlock( p_vout, &p_vout->p_picture[0] );

    return &p_vout->p_picture[0];
}

/**
 * Calculate image window coordinates
 *
 * This function will be accessed by plugins. It calculates the relative
 * position of the output window and the image window.
 */
void vout_PlacePicture( vout_thread_t *p_vout,
                        unsigned int i_width, unsigned int i_height,
                        unsigned int *pi_x, unsigned int *pi_y,
                        unsigned int *pi_width, unsigned int *pi_height )
{
    if( (i_width <= 0) || (i_height <=0) )
    {
        *pi_width = *pi_height = *pi_x = *pi_y = 0;
        return;
    }

    if( p_vout->b_scale )
    {
        *pi_width = i_width;
        *pi_height = i_height;
    }
    else
    {
        *pi_width = __MIN( i_width, p_vout->render.i_width );
        *pi_height = __MIN( i_height, p_vout->render.i_height );
    }

    if( VOUT_ASPECT_FACTOR * *pi_width / *pi_height < p_vout->render.i_aspect )
    {
        *pi_width = *pi_height * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
    }
    else
    {
        *pi_height = *pi_width * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect;
    }

    if( *pi_width > i_width )
    {
        *pi_width = i_width;
        *pi_height = VOUT_ASPECT_FACTOR * *pi_width / p_vout->render.i_aspect;
    }

    if( *pi_height > i_height )
    {
        *pi_height = i_height;
        *pi_width = *pi_height * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
    }

    switch( p_vout->i_alignment & VOUT_ALIGN_HMASK )
    {
    case VOUT_ALIGN_LEFT:
        *pi_x = 0;
        break;
    case VOUT_ALIGN_RIGHT:
        *pi_x = i_width - *pi_width;
        break;
    default:
        *pi_x = ( i_width - *pi_width ) / 2;
    }

    switch( p_vout->i_alignment & VOUT_ALIGN_VMASK )
    {
    case VOUT_ALIGN_TOP:
        *pi_y = 0;
        break;
    case VOUT_ALIGN_BOTTOM:
        *pi_y = i_height - *pi_height;
        break;
    default:
        *pi_y = ( i_height - *pi_height ) / 2;
    }
}

/**
 * Allocate a new picture in the heap.
 *
 * This function allocates a fake direct buffer in memory, which can be
 * used exactly like a video buffer. The video output thread then manages
 * how it gets displayed.
 */
int __vout_AllocatePicture( vlc_object_t *p_this, picture_t *p_pic,
                            vlc_fourcc_t i_chroma,
                            int i_width, int i_height, int i_aspect )
{
    int i_bytes, i_index, i_width_aligned, i_height_aligned;

    /* Make sure the real dimensions are a multiple of 16 */
    i_width_aligned = (i_width + 15) >> 4 << 4;
    i_height_aligned = (i_height + 15) >> 4 << 4;

    if( vout_InitPicture( p_this, p_pic, i_chroma,
                          i_width, i_height, i_aspect ) != VLC_SUCCESS )
    {
        p_pic->i_planes = 0;
        return VLC_EGENERIC;
    }

    /* Calculate how big the new image should be */
    i_bytes = p_pic->format.i_bits_per_pixel *
        i_width_aligned * i_height_aligned / 8;

    p_pic->p_data = vlc_memalign( &p_pic->p_data_orig, 16, i_bytes );

    if( p_pic->p_data == NULL )
    {
        p_pic->i_planes = 0;
        return VLC_EGENERIC;
    }

    /* Fill the p_pixels field for each plane */
    p_pic->p[ 0 ].p_pixels = p_pic->p_data;

    for( i_index = 1; i_index < p_pic->i_planes; i_index++ )
    {
        p_pic->p[i_index].p_pixels = p_pic->p[i_index-1].p_pixels +
            p_pic->p[i_index-1].i_lines * p_pic->p[i_index-1].i_pitch;
    }

    return VLC_SUCCESS;
}

/**
 * Initialise the video format fields given chroma/size.
 *
 * This function initializes all the video_frame_format_t fields given the
 * static properties of a picture (chroma and size).
 * \param p_format Pointer to the format structure to initialize
 * \param i_chroma Chroma to set
 * \param i_width Width to set
 * \param i_height Height to set
 * \param i_aspect Aspect ratio
 */
void vout_InitFormat( video_frame_format_t *p_format, vlc_fourcc_t i_chroma,
                      int i_width, int i_height, int i_aspect )
{
    p_format->i_chroma   = i_chroma;
    p_format->i_width    = p_format->i_visible_width  = i_width;
    p_format->i_height   = p_format->i_visible_height = i_height;
    p_format->i_x_offset = p_format->i_y_offset = 0;
    p_format->i_aspect   = i_aspect;

#if 0
    /* Assume we have square pixels */
    if( i_width && i_height )
        p_format->i_aspect = i_width * VOUT_ASPECT_FACTOR / i_height;
    else
        p_format->i_aspect = 0;
#endif

    switch( i_chroma )
    {
        case FOURCC_YUVA:
            p_format->i_bits_per_pixel = 32;
            break;
        case FOURCC_I444:
        case FOURCC_J444:
            p_format->i_bits_per_pixel = 24;
            break;
        case FOURCC_I422:
        case FOURCC_YUY2:
        case FOURCC_UYVY:
        case FOURCC_J422:
            p_format->i_bits_per_pixel = 16;
            p_format->i_bits_per_pixel = 16;
            break;
        case FOURCC_I411:
        case FOURCC_YV12:
        case FOURCC_I420:
        case FOURCC_J420:
        case FOURCC_IYUV:
            p_format->i_bits_per_pixel = 12;
            break;
        case FOURCC_I410:
        case FOURCC_YVU9:
            p_format->i_bits_per_pixel = 9;
            break;
        case FOURCC_Y211:
            p_format->i_bits_per_pixel = 8;
            break;
        case FOURCC_YUVP:
            p_format->i_bits_per_pixel = 8;
            break;

        case FOURCC_RV32:
            p_format->i_bits_per_pixel = 32;
            break;
        case FOURCC_RV24:
            p_format->i_bits_per_pixel = 24;
            break;
        case FOURCC_RV15:
        case FOURCC_RV16:
            p_format->i_bits_per_pixel = 16;
            break;
        case FOURCC_RGB2:
            p_format->i_bits_per_pixel = 8;
            break;
        default:
            p_format->i_bits_per_pixel = 0;
            break;
    }
}

/**
 * Initialise the picture_t fields given chroma/size.
 *
 * This function initializes most of the picture_t fields given a chroma and
 * size. It makes the assumption that stride == width.
 * \param p_this The calling object
 * \param p_pic Pointer to the picture to initialize
 * \param i_chroma The chroma fourcc to set
 * \param i_width The width of the picture
 * \param i_height The height of the picture
 * \param i_aspect The aspect ratio of the picture
 */
int __vout_InitPicture( vlc_object_t *p_this, picture_t *p_pic,
                        vlc_fourcc_t i_chroma,
                        int i_width, int i_height, int i_aspect )
{
    int i_index, i_width_aligned, i_height_aligned;