directx.c

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                                                &ddpfPixelFormat );

            if( ddpfPixelFormat.dwFlags & DDPF_RGB )
            {
                switch( ddpfPixelFormat.dwRGBBitCount )
                {
                case 8: /* FIXME: set the palette */
                    p_vout->output.i_chroma = VLC_FOURCC('R','G','B','2');
                    break;
                case 15:
                    p_vout->output.i_chroma = VLC_FOURCC('R','V','1','5');
                    break;
                case 16:
                    p_vout->output.i_chroma = VLC_FOURCC('R','V','1','6');
                    break;
                case 24:
                    p_vout->output.i_chroma = VLC_FOURCC('R','V','2','4');
                    break;
                case 32:
                    p_vout->output.i_chroma = VLC_FOURCC('R','V','3','2');
                    break;
                default:
                    msg_Err( p_vout, "unknown screen depth" );
                    return VLC_EGENERIC;
                }
                p_vout->output.i_rmask = ddpfPixelFormat.dwRBitMask;
                p_vout->output.i_gmask = ddpfPixelFormat.dwGBitMask;
                p_vout->output.i_bmask = ddpfPixelFormat.dwBBitMask;
            }

            p_vout->p_sys->b_hw_yuv = 0;

            i_ret = DirectXCreateSurface( p_vout, &p_surface,
                                          p_vout->output.i_chroma,
                                          0 /* no overlay */,
                                          0 /* no back buffers */ );

            if( i_ret && !p_vout->p_sys->b_use_sysmem )
            {
                /* Give it a last try with b_use_sysmem enabled */
                p_vout->p_sys->b_use_sysmem = 1;

                i_ret = DirectXCreateSurface( p_vout, &p_surface,
                                              p_vout->output.i_chroma,
                                              0 /* no overlay */,
                                              0 /* no back buffers */ );
            }
        }

        if( i_ret == VLC_SUCCESS )
        {
            /* Allocate internal structure */
            p_pic[0].p_sys = malloc( sizeof( picture_sys_t ) );
            if( p_pic[0].p_sys == NULL )
            {
                DirectXCloseSurface( p_vout, p_surface );
                return VLC_ENOMEM;
            }

            p_pic[0].p_sys->p_surface = p_pic[0].p_sys->p_front_surface
                = p_surface;

            I_OUTPUTPICTURES = 1;

            msg_Dbg( p_vout, "created plain surface of chroma:%.4s",
                     (char *)&p_vout->output.i_chroma );
        }
    }


    /* Now that we've got all our direct-buffers, we can finish filling in the
     * picture_t structures */
    for( i = 0; i < I_OUTPUTPICTURES; i++ )
    {
        p_pic[i].i_status = DESTROYED_PICTURE;
        p_pic[i].i_type   = DIRECT_PICTURE;
        p_pic[i].pf_lock  = DirectXLockSurface;
        p_pic[i].pf_unlock = DirectXUnlockSurface;
        PP_OUTPUTPICTURE[i] = &p_pic[i];

        if( DirectXLockSurface( p_vout, &p_pic[i] ) != VLC_SUCCESS )
        {
            /* AAARRGG */
            FreePictureVec( p_vout, p_pic, I_OUTPUTPICTURES );
            I_OUTPUTPICTURES = 0;
            msg_Err( p_vout, "cannot lock surface" );
            return VLC_EGENERIC;
        }
        DirectXUnlockSurface( p_vout, &p_pic[i] );
    }

    msg_Dbg( p_vout, "End NewPictureVec (%s)",
             I_OUTPUTPICTURES ? "succeeded" : "failed" );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * FreePicture: destroy a picture vector allocated with NewPictureVec
 *****************************************************************************
 *
 *****************************************************************************/
static void FreePictureVec( vout_thread_t *p_vout, picture_t *p_pic,
                            int i_num_pics )
{
    int i;

    for( i = 0; i < i_num_pics; i++ )
    {
        DirectXCloseSurface( p_vout, p_pic[i].p_sys->p_front_surface );

        for( i = 0; i < i_num_pics; i++ )
        {
            free( p_pic[i].p_sys );
        }
    }

    p_vout->p_sys->p_current_surface = 0;
}

/*****************************************************************************
 * UpdatePictureStruct: updates the internal data in the picture_t structure
 *****************************************************************************
 * This will setup stuff for use by the video_output thread
 *****************************************************************************/
static int UpdatePictureStruct( vout_thread_t *p_vout, picture_t *p_pic,
                                int i_chroma )
{
    switch( p_vout->output.i_chroma )
    {
        case VLC_FOURCC('R','G','B','2'):
        case VLC_FOURCC('R','V','1','5'):
        case VLC_FOURCC('R','V','1','6'):
        case VLC_FOURCC('R','V','2','4'):
        case VLC_FOURCC('R','V','3','2'):
            p_pic->p->p_pixels = p_pic->p_sys->ddsd.lpSurface;
            p_pic->p->i_lines = p_vout->output.i_height;
            p_pic->p->i_pitch = p_pic->p_sys->ddsd.lPitch;
            switch( p_vout->output.i_chroma )
            {
                case VLC_FOURCC('R','G','B','2'):
                    p_pic->p->i_pixel_pitch = 1;
                    break;
                case VLC_FOURCC('R','V','1','5'):
                case VLC_FOURCC('R','V','1','6'):
                    p_pic->p->i_pixel_pitch = 2;
                    break;
                case VLC_FOURCC('R','V','2','4'):
                    p_pic->p->i_pixel_pitch = 3;
                    break;
                case VLC_FOURCC('R','V','3','2'):
                    p_pic->p->i_pixel_pitch = 4;
                    break;
                default:
                    return VLC_EGENERIC;
            }
            p_pic->p->i_visible_pitch = p_vout->output.i_width *
              p_pic->p->i_pixel_pitch;
            p_pic->i_planes = 1;
            break;

        case VLC_FOURCC('Y','V','1','2'):

            p_pic->Y_PIXELS = p_pic->p_sys->ddsd.lpSurface;
            p_pic->p[Y_PLANE].i_lines = p_vout->output.i_height;
            p_pic->p[Y_PLANE].i_pitch = p_pic->p_sys->ddsd.lPitch;
            p_pic->p[Y_PLANE].i_pixel_pitch = 1;
            p_pic->p[Y_PLANE].i_visible_pitch = p_vout->output.i_width *
              p_pic->p[Y_PLANE].i_pixel_pitch;

            p_pic->V_PIXELS =  p_pic->Y_PIXELS
              + p_pic->p[Y_PLANE].i_lines * p_pic->p[Y_PLANE].i_pitch;
            p_pic->p[V_PLANE].i_lines = p_vout->output.i_height / 2;
            p_pic->p[V_PLANE].i_pitch = p_pic->p[Y_PLANE].i_pitch / 2;
            p_pic->p[V_PLANE].i_pixel_pitch = 1;
            p_pic->p[V_PLANE].i_visible_pitch = p_vout->output.i_width / 2 *
              p_pic->p[V_PLANE].i_pixel_pitch;

            p_pic->U_PIXELS = p_pic->V_PIXELS
              + p_pic->p[V_PLANE].i_lines * p_pic->p[V_PLANE].i_pitch;
            p_pic->p[U_PLANE].i_lines = p_vout->output.i_height / 2;
            p_pic->p[U_PLANE].i_pitch = p_pic->p[Y_PLANE].i_pitch / 2;
            p_pic->p[U_PLANE].i_pixel_pitch = 1;
            p_pic->p[U_PLANE].i_visible_pitch = p_vout->output.i_width / 2 *
              p_pic->p[U_PLANE].i_pixel_pitch;

            p_pic->i_planes = 3;
            break;

        case VLC_FOURCC('I','Y','U','V'):

            p_pic->Y_PIXELS = p_pic->p_sys->ddsd.lpSurface;
            p_pic->p[Y_PLANE].i_lines = p_vout->output.i_height;
            p_pic->p[Y_PLANE].i_pitch = p_pic->p_sys->ddsd.lPitch;
            p_pic->p[Y_PLANE].i_pixel_pitch = 1;
            p_pic->p[Y_PLANE].i_visible_pitch = p_vout->output.i_width *
              p_pic->p[Y_PLANE].i_pixel_pitch;

            p_pic->U_PIXELS = p_pic->Y_PIXELS
              + p_pic->p[Y_PLANE].i_lines * p_pic->p[Y_PLANE].i_pitch;
            p_pic->p[U_PLANE].i_lines = p_vout->output.i_height / 2;
            p_pic->p[U_PLANE].i_pitch = p_pic->p[Y_PLANE].i_pitch / 2;
            p_pic->p[U_PLANE].i_pixel_pitch = 1;
            p_pic->p[U_PLANE].i_visible_pitch = p_vout->output.i_width / 2 *
              p_pic->p[U_PLANE].i_pixel_pitch;

            p_pic->V_PIXELS =  p_pic->U_PIXELS
              + p_pic->p[U_PLANE].i_lines * p_pic->p[U_PLANE].i_pitch;
            p_pic->p[V_PLANE].i_lines = p_vout->output.i_height / 2;
            p_pic->p[V_PLANE].i_pitch = p_pic->p[Y_PLANE].i_pitch / 2;
            p_pic->p[V_PLANE].i_pixel_pitch = 1;
            p_pic->p[V_PLANE].i_visible_pitch = p_vout->output.i_width / 2 *
              p_pic->p[V_PLANE].i_pixel_pitch;

            p_pic->i_planes = 3;
            break;

        case VLC_FOURCC('Y','U','Y','2'):

            p_pic->p->p_pixels = p_pic->p_sys->ddsd.lpSurface;
            p_pic->p->i_lines = p_vout->output.i_height;
            p_pic->p->i_pitch = p_pic->p_sys->ddsd.lPitch;
            p_pic->p->i_pixel_pitch = 2;
            p_pic->p->i_visible_pitch = p_vout->output.i_width *
              p_pic->p->i_pixel_pitch;

            p_pic->i_planes = 1;
            break;

        default:
            /* Unknown chroma, tell the guy to get lost */
            msg_Err( p_vout, "never heard of chroma 0x%.8x (%4.4s)",
                     p_vout->output.i_chroma,
                     (char*)&p_vout->output.i_chroma );
            return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DirectXGetDDrawCaps: Probe the capabilities of the hardware
 *****************************************************************************
 * It is nice to know which features are supported by the hardware so we can
 * find ways to optimize our rendering.
 *****************************************************************************/
static void DirectXGetDDrawCaps( vout_thread_t *p_vout )
{
    DDCAPS ddcaps;
    HRESULT dxresult;

    /* This is just an indication of whether or not we'll support overlay,
     * but with this test we don't know if we support YUV overlay */
    memset( &ddcaps, 0, sizeof( DDCAPS ));
    ddcaps.dwSize = sizeof(DDCAPS);
    dxresult = IDirectDraw2_GetCaps( p_vout->p_sys->p_ddobject,
                                     &ddcaps, NULL );
    if(dxresult != DD_OK )
    {
        msg_Warn( p_vout, "cannot get caps" );
    }
    else
    {
        BOOL bHasOverlay, bHasOverlayFourCC, bCanDeinterlace,
             bHasColorKey, bCanStretch, bCanBltFourcc;

        /* Determine if the hardware supports overlay surfaces */
        bHasOverlay = ((ddcaps.dwCaps & DDCAPS_OVERLAY) ==
                       DDCAPS_OVERLAY) ? TRUE : FALSE;
        /* Determine if the hardware supports overlay surfaces */
        bHasOverlayFourCC = ((ddcaps.dwCaps & DDCAPS_OVERLAYFOURCC) ==
                       DDCAPS_OVERLAYFOURCC) ? TRUE : FALSE;
        /* Determine if the hardware supports overlay deinterlacing */
        bCanDeinterlace = ((ddcaps.dwCaps & DDCAPS2_CANFLIPODDEVEN) ==
                       0 ) ? TRUE : FALSE;
        /* Determine if the hardware supports colorkeying */
        bHasColorKey = ((ddcaps.dwCaps & DDCAPS_COLORKEY) ==
                        DDCAPS_COLORKEY) ? TRUE : FALSE;
        /* Determine if the hardware supports scaling of the overlay surface */
        bCanStretch = ((ddcaps.dwCaps & DDCAPS_OVERLAYSTRETCH) ==
                       DDCAPS_OVERLAYSTRETCH) ? TRUE : FALSE;
        /* Determine if the hardware supports color conversion during a blit */
        bCanBltFourcc = ((ddcaps.dwCaps & DDCAPS_BLTFOURCC ) ==
                        DDCAPS_BLTFOURCC) ? TRUE : FALSE;

        msg_Dbg( p_vout, "DirectDraw Capabilities: overlay=%i yuvoverlay=%i "
                         "can_deinterlace_overlay=%i colorkey=%i stretch=%i "
                         "bltfourcc=%i",
                         bHasOverlay, bHasOverlayFourCC, bCanDeinterlace,
                         bHasColorKey, bCanStretch, bCanBltFourcc );

        /* Don't ask for troubles */
        if( !bCanBltFourcc ) p_vout->p_sys->b_hw_yuv = FALSE;
    }
}

/*****************************************************************************
 * DirectXLockSurface: Lock surface and get picture data pointer
 *****************************************************************************
 * This function locks a surface and get the surface descriptor which amongst
 * other things has the pointer to the picture data.
 *****************************************************************************/
static int DirectXLockSurface( vout_thread_t *p_vout, picture_t *p_pic )
{
    HRESULT dxresult;

    /* Lock the surface to get a valid pointer to the picture buffer */
    memset( &p_pic->p_sys->ddsd, 0, sizeof( DDSURFACEDESC ));
    p_pic->p_sys->ddsd.dwSize = sizeof(DDSURFACEDESC);
    dxresult = IDirectDrawSurface2_Lock( p_pic->p_sys->p_surface,
                                         NULL, &p_pic->p_sys->ddsd,
                                         DDLOCK_NOSYSLOCK | DDLOCK_WAIT,
                                         NULL );
    if( dxresult != DD_OK )
    {
        if( dxresult == DDERR_INVALIDPARAMS )
        {
            /* DirectX 3 doesn't support the DDLOCK_NOSYSLOCK flag, resulting
             * in an invalid params error */
            dxresult = IDirectDrawSurface2_Lock( p_pic->p_sys->p_surface, NULL,
                                             &p_pic->p_sys->ddsd,
                                             DDLOCK_WAIT, NULL);
        }
        if( dxresult == DDERR_SURFACELOST )
        {
            /* Your surface can be lost so be sure
             * to check this and restore it if needed */

            /* When using overlays with back-buffers, we need to restore
             * the front buffer so the back-buffers get restored as well. */
            if( p_vout->