video_out_x11.c

比较早的MPEG－2的解码源程序

	alloc += size;
    }

    return 0;
}

static void x11_teardown (x11_instance_t * instance)
{
    int i;

    for (i = 0; i < 3; i++) {
	while (instance->frame[i].wait_completion)
	    x11_event (instance);
	XDestroyImage (instance->frame[i].ximage);
    }
    destroy_shm (instance);
}

static void x11_close (vo_instance_t * _instance)
{
    x11_instance_t * instance = (x11_instance_t *) _instance;

    if (instance->teardown != NULL)
	instance->teardown (instance);
    XFreeGC (instance->display, instance->gc);
    XDestroyWindow (instance->display, instance->window);
#ifdef LIBVO_XV
    if (instance->adaptors)
	XvFreeAdaptorInfo (instance->adaptorInfo);
#endif
    XCloseDisplay (instance->display);
    free (instance);
}

#ifdef LIBVO_XV
static void xv_setup_fbuf (vo_instance_t * _instance,
			   uint8_t ** buf, void ** id)
{
    x11_instance_t * instance = (x11_instance_t *) _instance;
    uint8_t * data;

    data = (uint8_t *) instance->frame[instance->index].xvimage->data;
    buf[0] = data + instance->frame[instance->index].xvimage->offsets[0];
    buf[1] = data + instance->frame[instance->index].xvimage->offsets[2];
    buf[2] = data + instance->frame[instance->index].xvimage->offsets[1];
    *id = instance->frame + instance->index++;
}

static void xv_draw_frame (vo_instance_t * _instance,
			   uint8_t * const * buf, void * id)
{
    x11_frame_t * frame = (x11_frame_t *) id;
    x11_instance_t * instance = (x11_instance_t *) _instance;

    XvShmPutImage (instance->display, instance->port, instance->window,
		   instance->gc, frame->xvimage, 0, 0,
		   instance->width, instance->height, 0, 0,
		   instance->width, instance->height, True);
    XFlush (instance->display);
    frame->wait_completion = 1;
}

static int xv_check_fourcc (x11_instance_t * instance, XvPortID port,
			    int fourcc, const char * fourcc_str)
{
    XvImageFormatValues * formatValues;
    int formats;
    int i;

    formatValues = XvListImageFormats (instance->display, port, &formats);
    for (i = 0; i < formats; i++)
	if ((formatValues[i].id == fourcc) &&
	    (! (strcmp (formatValues[i].guid, fourcc_str)))) {
	    XFree (formatValues);
	    return 0;
	}
    XFree (formatValues);
    return 1;
}

static int xv_check_extension (x11_instance_t * instance,
			       int fourcc, const char * fourcc_str)
{
    unsigned int i;
    unsigned long j;

    if (!instance->adaptorInfo) {
	unsigned int version;
	unsigned int release;
	unsigned int dummy;

	if ((XvQueryExtension (instance->display, &version, &release,
			       &dummy, &dummy, &dummy) != Success) ||
	    (version < 2) || ((version == 2) && (release < 2))) {
	    fprintf (stderr, "No xv extension\n");
	    return 1;
	}

	XvQueryAdaptors (instance->display, instance->window,
			 &instance->adaptors, &instance->adaptorInfo);
    }

    for (i = 0; i < instance->adaptors; i++)
	if (instance->adaptorInfo[i].type & XvImageMask)
	    for (j = 0; j < instance->adaptorInfo[i].num_ports; j++)
		if ((! (xv_check_fourcc (instance,
					 instance->adaptorInfo[i].base_id + j,
					 fourcc, fourcc_str))) &&
		    (XvGrabPort (instance->display,
				 instance->adaptorInfo[i].base_id + j,
				 0) == Success)) {
		    instance->port = instance->adaptorInfo[i].base_id + j;
		    return 0;
		}

    fprintf (stderr, "Cannot find xv %s port\n", fourcc_str);
    return 1;
}

static int xv_alloc_frames (x11_instance_t * instance, int size,
			    int fourcc)
{
    char * alloc;
    int i = 0;

    alloc = (char *) create_shm (instance, 3 * size);
    if (alloc == NULL)
	return 1;

    while (i < 3) {
	instance->frame[i].wait_completion = 0;
	instance->frame[i].xvimage =
	    XvShmCreateImage (instance->display, instance->port, fourcc,
			      alloc, instance->width, instance->height,
			      &(instance->shminfo));
	instance->frame[i].data = alloc;
	alloc += size;
	if ((instance->frame[i].xvimage == NULL) ||
	    (instance->frame[i++].xvimage->data_size != size)) {
	    while (--i >= 0)
		XFree (instance->frame[i].xvimage);
	    destroy_shm (instance);
	    return 1;
	}
    }

    return 0;
}

static void xv_teardown (x11_instance_t * instance)
{
    int i;

    for (i = 0; i < 3; i++) {
	while (instance->frame[i].wait_completion)
	    x11_event (instance);
	XFree (instance->frame[i].xvimage);
    }
    destroy_shm (instance);
    XvUngrabPort (instance->display, instance->port, 0);
}
#endif

static int common_setup (vo_instance_t * _instance, unsigned int width,
			 unsigned int height, unsigned int chroma_width,
			 unsigned int chroma_height,
			 vo_setup_result_t * result)
{
    x11_instance_t * instance = (x11_instance_t *) _instance;

    if (instance->display != NULL) {
	/* Already setup, just adjust to the new size */
	if (instance->teardown != NULL)
	    instance->teardown (instance);
        XResizeWindow (instance->display, instance->window, width, height);
    } else {
	/* Not setup yet, do the full monty */
        if (open_display (instance, width, height))
            return 1;
        XMapWindow (instance->display, instance->window);
    }
    instance->vo.setup_fbuf = NULL;
    instance->vo.start_fbuf = NULL;
    instance->vo.set_fbuf = NULL;
    instance->vo.draw = NULL;
    instance->vo.discard = NULL;
    instance->vo.close = x11_close;
    instance->width = width;
    instance->height = height;
    instance->index = 0;
    instance->teardown = NULL;
    result->convert = NULL;

#ifdef LIBVO_XV
    if (instance->xv == 1 &&
	(chroma_width == width >> 1) && (chroma_height == height >> 1) &&
	!xv_check_extension (instance, FOURCC_YV12, "YV12") &&
	!xv_alloc_frames (instance, 3 * width * height / 2, FOURCC_YV12)) {
	instance->vo.setup_fbuf = xv_setup_fbuf;
	instance->vo.start_fbuf = x11_start_fbuf;
	instance->vo.draw = xv_draw_frame;
	instance->teardown = xv_teardown;
    } else if (instance->xv && (chroma_width == width >> 1) &&
	       !xv_check_extension (instance, FOURCC_UYVY, "UYVY") &&
	       !xv_alloc_frames (instance, 2 * width * height, FOURCC_UYVY)) {
	instance->vo.setup_fbuf = x11_setup_fbuf;
	instance->vo.start_fbuf = x11_start_fbuf;
	instance->vo.draw = xv_draw_frame;
	instance->teardown = xv_teardown;
	result->convert = mpeg2convert_uyvy;
    } else
#endif
    if (!x11_alloc_frames (instance)) {
	int bpp;

	instance->vo.setup_fbuf = x11_setup_fbuf;
	instance->vo.start_fbuf = x11_start_fbuf;
	instance->vo.draw = x11_draw_frame;
	instance->teardown = x11_teardown;

#ifdef WORDS_BIGENDIAN
	if (instance->frame[0].ximage->byte_order != MSBFirst) {
	    fprintf (stderr, "No support for non-native byte order\n");
	    return 1;
	}
#else
	if (instance->frame[0].ximage->byte_order != LSBFirst) {
	    fprintf (stderr, "No support for non-native byte order\n");
	    return 1;
	}
#endif

	/*
	 * depth in X11 terminology land is the number of bits used to
	 * actually represent the colour.
	 *
	 * bpp in X11 land means how many bits in the frame buffer per
	 * pixel.
	 *
	 * ex. 15 bit color is 15 bit depth and 16 bpp. Also 24 bit
	 *     color is 24 bit depth, but can be 24 bpp or 32 bpp.
	 *
	 * If we have blue in the lowest bit then "obviously" RGB
	 * (the guy who wrote this convention never heard of endianness ?)
	 */

	bpp = ((instance->vinfo.depth == 24) ?
	       instance->frame[0].ximage->bits_per_pixel :
	       instance->vinfo.depth);
	result->convert =
	    mpeg2convert_rgb (((instance->frame[0].ximage->blue_mask & 1) ?
			       MPEG2CONVERT_RGB : MPEG2CONVERT_BGR), bpp);
	if (result->convert == NULL) {
	    fprintf (stderr, "%dbpp not supported\n", bpp);
	    return 1;
	}
    }

    return 0;
}

static vo_instance_t * common_open (int xv)
{
    x11_instance_t * instance;

    instance = (x11_instance_t *) malloc (sizeof (x11_instance_t));
    if (instance == NULL)
	return NULL;

    instance->vo.setup = common_setup;
    instance->vo.close = (void (*) (vo_instance_t *)) free;
    instance->display = NULL;
#ifdef LIBVO_XV
    instance->xv = xv;
#endif
    return (vo_instance_t *) instance;
}

vo_instance_t * vo_x11_open (void)
{
    return common_open (0);
}

#ifdef LIBVO_XV
vo_instance_t * vo_xv_open (void)
{
    return common_open (1);
}

vo_instance_t * vo_xv2_open (void)
{
    return common_open (2);
}
#endif
#endif