/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

/* This is the XFree86 Xv extension implementation of YUV video overlays */

#include <X11/Xlib.h>

#include <sys/ipc.h>

#include <sys/shm.h>

#include <X11/extensions/XShm.h>

#include "SDL_x11yuv_c.h"

#define XFREE86_REFRESH_HACK

#ifdef XFREE86_REFRESH_HACK

#include "SDL_x11image_c.h"

#endif

/* Workaround when pitch != width */

#define PITCH_WORKAROUND

/* Workaround intel i810 video overlay waiting with failing until the

first Xv[Shm]PutImage call <sigh> */

#define INTEL_XV_BADALLOC_WORKAROUND

/* The functions used to manipulate software video overlays */

static struct private_yuvhwfuncs x11_yuvfuncs = {

X11_LockYUVOverlay,

X11_UnlockYUVOverlay,

X11_DisplayYUVOverlay,

X11_FreeYUVOverlay

};

struct private_yuvhwdata {

int port;

#ifndef NO_SHARED_MEMORY

int yuv_use_mitshm;

};

static int (*X_handler)(Display *, XErrorEvent *) = NULL;

#ifndef NO_SHARED_MEMORY

/* Shared memory error handler routine */

static int shm_error;

static int shm_errhandler(Display *d, XErrorEvent *e)

{

if ( e->error_code == BadAccess ) {

shm_error = True;

return(0);

} else

return(X_handler(d,e));

}

#endif /* !NO_SHARED_MEMORY */

static int xv_error;

static int xv_errhandler(Display *d, XErrorEvent *e)

{

if ( e->error_code == BadMatch ) {

xv_error = True;

return(0);

} else

return(X_handler(d,e));

}

#ifdef INTEL_XV_BADALLOC_WORKAROUND

static int intel_errhandler(Display *d, XErrorEvent *e)

{

if ( e->error_code == BadAlloc ) {

xv_error = True;

return(0);

} else

return(X_handler(d,e));

}

static void X11_ClearYUVOverlay(SDL_Overlay *overlay)

{

int x,y;

switch (overlay->format)

{

case SDL_YV12_OVERLAY:

case SDL_IYUV_OVERLAY:

for (y = 0; y < overlay->h; y++)

memset(overlay->pixels[0] + y * overlay->pitches[0],

0, overlay->w);

for (y = 0; y < (overlay->h / 2); y++)

{

memset(overlay->pixels[1] + y * overlay->pitches[1],

-128, overlay->w / 2);

memset(overlay->pixels[2] + y * overlay->pitches[2],

-128, overlay->w / 2);

}

break;

case SDL_YUY2_OVERLAY:

case SDL_YVYU_OVERLAY:

for (y = 0; y < overlay->h; y++)

{

for (x = 0; x < overlay->w; x += 2)

{

Uint8 *pixel_pair = overlay->pixels[0] +

y * overlay->pitches[0] + x * 2;

pixel_pair[0] = 0;

pixel_pair[1] = -128;

pixel_pair[2] = 0;

pixel_pair[3] = -128;

}

}

break;

case SDL_UYVY_OVERLAY:

for (y = 0; y < overlay->h; y++)

{

for (x = 0; x < overlay->w; x += 2)

{

Uint8 *pixel_pair = overlay->pixels[0] +

y * overlay->pitches[0] + x * 2;

pixel_pair[0] = -128;

pixel_pair[1] = 0;

pixel_pair[2] = -128;

pixel_pair[3] = 0;

}

}

break;

}

}

#endif

SDL_Overlay *X11_CreateYUVOverlay(_THIS, int width, int height, Uint32 format, SDL_Surface *display)

{

SDL_Overlay *overlay;

struct private_yuvhwdata *hwdata;

int xv_port;

unsigned int i, j, k;

unsigned int adaptors;

int bpp;

#ifndef NO_SHARED_MEMORY

#ifdef INTEL_XV_BADALLOC_WORKAROUND

int intel_adapter = False;

#endif

/* Look for the XVideo extension with a valid port for this format */

xv_port = -1;

if ( (Success == SDL_NAME(XvQueryExtension)(GFX_Display, &j, &j, &j, &j, &j)) &&

(Success == SDL_NAME(XvQueryAdaptors)(GFX_Display,

RootWindow(GFX_Display, SDL_Screen),

&adaptors, &ainfo)) ) {

/* Check to see if the visual can be used */

if ( BUGGY_XFREE86(<=, 4001) ) {

int visual_ok = 0;

for ( j=0; j<ainfo[i].num_formats; ++j ) {

if ( ainfo[i].formats[j].visual_id ==

SDL_Visual->visualid ) {

visual_ok = 1;

break;

}

}

if ( ! visual_ok ) {

continue;

}

}

#ifdef INTEL_XV_BADALLOC_WORKAROUND

if ( !strcmp(ainfo[i].name, "Intel(R) Video Overla"))

intel_adapter = True;

else

intel_adapter = False;

#endif

if ( (ainfo[i].type & XvInputMask) &&

(ainfo[i].type & XvImageMask) ) {

int num_formats;

SDL_NAME(XvImageFormatValues) *formats;

formats = SDL_NAME(XvListImageFormats)(GFX_Display,

if ( (Uint32)formats[j].id == format ) {

for ( k=0; k < ainfo[i].num_ports; ++k ) {

xv_port = ainfo[i].base_id+k;

break;

}

}

}

}

}

}

/* Precalculate the bpp for the pitch workaround below */

switch (format) {

/* Add any other cases we need to support... */

case SDL_YUY2_OVERLAY:

case SDL_UYVY_OVERLAY:

case SDL_YVYU_OVERLAY:

bpp = 2;

break;

default:

bpp = 1;

break;

}

/*

* !!! FIXME:

* "Here are some diffs for X11 and yuv. Note that the last part 2nd

* diff should probably be a new call to XvQueryAdaptorFree with ainfo

* and the number of adaptors, instead of the loop through like I did."

*

* ACHTUNG: This is broken! It looks like XvFreeAdaptorInfo does this

* for you, so we end up with a double-free. I need to look at this

* more closely... --ryan.

*/

for ( i=0; i < adaptors; ++i ) {

if (ainfo[i].name != NULL) Xfree(ainfo[i].name);

if (ainfo[i].formats != NULL) Xfree(ainfo[i].formats);

}

Xfree(ainfo);

if ( xv_port == -1 ) {

SDL_SetError("No available video ports for requested format");

return(NULL);

}

/* Enable auto-painting of the overlay colorkey */

{

static const char *attr[] = { "XV_AUTOPAINT_COLORKEY", "XV_AUTOPAINT_COLOURKEY" };

unsigned int i;

SDL_NAME(XvSelectPortNotify)(GFX_Display, xv_port, True);

for ( i=0; i < sizeof(attr)/(sizeof attr[0]); ++i ) {

Atom a;

xv_error = False;

if ( a != None ) {

SDL_NAME(XvSetPortAttribute)(GFX_Display, xv_port, a, 1);

if ( ! xv_error ) {

break;

}

}

}

SDL_NAME(XvSelectPortNotify)(GFX_Display, xv_port, False);

}

SDL_OutOfMemory();

return(NULL);

}

/* Fill in the basic members */

overlay->format = format;

overlay->w = width;

overlay->h = height;

/* Set up the YUV surface function structure */

overlay->hwfuncs = &x11_yuvfuncs;

overlay->hw_overlay = 1;

/* Create the pixel data and lookup tables */

overlay->hwdata = hwdata;

if ( hwdata == NULL ) {

SDL_OutOfMemory();

SDL_FreeYUVOverlay(overlay);

return(NULL);

}

hwdata->port = xv_port;

#ifndef NO_SHARED_MEMORY

if ( hwdata->image != NULL && hwdata->image->pitches[0] != (width*bpp) ) {

/* Ajust overlay width according to pitch */

width = hwdata->image->pitches[0] / bpp;

hwdata->image = SDL_NAME(XvShmCreateImage)(GFX_Display, xv_port, format,

0, width, height, yuvshm);

#endif /* PITCH_WORKAROUND */

hwdata->yuv_use_mitshm = (hwdata->image != NULL);

if ( hwdata->yuv_use_mitshm ) {

yuvshm->shmid = shmget(IPC_PRIVATE, hwdata->image->data_size,

IPC_CREAT | 0777);

if ( yuvshm->shmid >= 0 ) {

yuvshm->shmaddr = (char *)shmat(yuvshm->shmid, 0, 0);

yuvshm->readOnly = False;

if ( yuvshm->shmaddr != (char *)-1 ) {

shm_error = False;

X_handler = XSetErrorHandler(shm_errhandler);

XShmAttach(GFX_Display, yuvshm);

XSync(GFX_Display, True);

XSetErrorHandler(X_handler);

if ( shm_error )

shmdt(yuvshm->shmaddr);

} else {

shm_error = True;

}

shmctl(yuvshm->shmid, IPC_RMID, NULL);

} else {

shm_error = True;

}

if ( shm_error ) {

hwdata->yuv_use_mitshm = 0;

} else {

hwdata->image->data = yuvshm->shmaddr;

}

if ( !hwdata->yuv_use_mitshm )

#endif /* NO_SHARED_MEMORY */

{

hwdata->image = SDL_NAME(XvCreateImage)(GFX_Display, xv_port, format,

0, width, height);

#ifdef PITCH_WORKAROUND

if ( hwdata->image != NULL && hwdata->image->pitches[0] != (width*bpp) ) {

/* Ajust overlay width according to pitch */

width = hwdata->image->pitches[0] / bpp;

hwdata->image = SDL_NAME(XvCreateImage)(GFX_Display, xv_port, format,

0, width, height);

}

#endif /* PITCH_WORKAROUND */

if ( hwdata->image == NULL ) {

SDL_SetError("Couldn't create XVideo image");

SDL_FreeYUVOverlay(overlay);

return(NULL);

}

if ( hwdata->image->data == NULL ) {

SDL_OutOfMemory();

SDL_FreeYUVOverlay(overlay);

return(NULL);

}

}

/* Find the pitch and offset values for the overlay */

overlay->planes = hwdata->image->num_planes;

overlay->pitches = (Uint16 *)SDL_malloc(overlay->planes * sizeof(Uint16));

overlay->pixels = (Uint8 **)SDL_malloc(overlay->planes * sizeof(Uint8 *));

if ( !overlay->pitches || !overlay->pixels ) {

SDL_OutOfMemory();

SDL_FreeYUVOverlay(overlay);

return(NULL);

}

for ( i=0; i<overlay->planes; ++i ) {

overlay->pitches[i] = hwdata->image->pitches[i];

overlay->pixels[i] = (Uint8 *)hwdata->image->data +

hwdata->image->offsets[i];

}

#ifdef XFREE86_REFRESH_HACK

/* Work around an XFree86 X server bug (?)

We can't perform normal updates in windows that have video

being output to them. See SDL_x11image.c for more details.

*/

X11_DisableAutoRefresh(this);

#endif

#ifdef INTEL_XV_BADALLOC_WORKAROUND

/* HACK, GRRR sometimes (i810) creating the overlay succeeds, but the

first call to XvShm[Put]Image to a mapped window fails with:

"BadAlloc (insufficient resources for operation)". This happens with

certain formats when the XvImage is too large to the i810's liking.

We work around this by doing a test XvShm[Put]Image with a black

Xv image, this may cause some flashing, so only do this check if we

are running on an intel Xv-adapter. */

if (intel_adapter)

{

xv_error = False;

X_handler = XSetErrorHandler(intel_errhandler);

X11_ClearYUVOverlay(overlay);

/* We set the destination height and width to 1 pixel to avoid

putting a large black rectangle over the screen, thus

strongly reducing possible flashing. */

#ifndef NO_SHARED_MEMORY

if ( hwdata->yuv_use_mitshm ) {

SDL_NAME(XvShmPutImage)(GFX_Display, hwdata->port,

SDL_Window, SDL_GC,

hwdata->image,

0, 0, overlay->w, overlay->h,

0, 0, 1, 1, False);

}

else

#endif

{

SDL_NAME(XvPutImage)(GFX_Display, hwdata->port,

SDL_Window, SDL_GC,

hwdata->image,

0, 0, overlay->w, overlay->h,

0, 0, 1, 1);

}

XSync(GFX_Display, False);

XSetErrorHandler(X_handler);

if (xv_error)

{

X11_FreeYUVOverlay(this, overlay);

return NULL;

}

/* Repair the (1 pixel worth of) damage we've just done */

X11_RefreshDisplay(this);

}

#endif

/* We're all done.. */

return(overlay);

}

int X11_LockYUVOverlay(_THIS, SDL_Overlay *overlay)

{

return(0);

}

void X11_UnlockYUVOverlay(_THIS, SDL_Overlay *overlay)

{

return;

}

{

struct private_yuvhwdata *hwdata;

hwdata = overlay->hwdata;

#ifndef NO_SHARED_MEMORY

if ( hwdata->yuv_use_mitshm ) {

SDL_NAME(XvShmPutImage)(GFX_Display, hwdata->port, SDL_Window, SDL_GC,

src->x, src->y, src->w, src->h,

dst->x, dst->y, dst->w, dst->h, False);

}

else

#endif

{

SDL_NAME(XvPutImage)(GFX_Display, hwdata->port, SDL_Window, SDL_GC,

src->x, src->y, src->w, src->h,

dst->x, dst->y, dst->w, dst->h);

return(0);

}

void X11_FreeYUVOverlay(_THIS, SDL_Overlay *overlay)

{

struct private_yuvhwdata *hwdata;

hwdata = overlay->hwdata;

if ( hwdata ) {

#ifndef NO_SHARED_MEMORY

if ( hwdata->yuv_use_mitshm ) {

shmdt(hwdata->yuvshm.shmaddr);

}

}

if ( overlay->pitches ) {

overlay->pitches = NULL;

}

if ( overlay->pixels ) {

overlay->pixels = NULL;

}

#ifdef XFREE86_REFRESH_HACK

X11_EnableAutoRefresh(this);

#endif

}