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_camera.c
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/*
pygame-ce - Python Game Library
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Camera - webcam support for pygame
* Author: Nirav Patel
*
* This module allows for use of v4l2 webcams in pygame. The code is written
* such that adding support for vfw cameras should be possible without
* much modification of existing functions. v4l2 functions are kept separate
* from functions available to pygame-ce users and generic functions like
* colorspace conversion.
*
* There is currently support for cameras that support MMAP and use
* pixelformats of RGB24, RGB444, YUYV, SBGGR8, and YUV420. To add support for
* additional pixelformats, add them to v4l2_init_device and
* v4l2_process_image, and add functions to convert the format to packed RGB,
* YUV, and HSV.
*/
#include "camera.h"
#include "pgcompat.h"
/*
#if defined(__unix__) || !defined(__APPLE__)
#else
#define V4L2_PIX_FMT_RGB24 1
#define V4L2_PIX_FMT_RGB444 1
#endif
*/
/* functions available to pygame-ce users */
PyObject *
surf_colorspace(PyObject *self, PyObject *arg);
PyObject *
list_cameras(PyObject *self, PyObject *arg);
PyObject *
camera_start(pgCameraObject *self, PyObject *args);
PyObject *
camera_stop(pgCameraObject *self, PyObject *args);
PyObject *
camera_get_controls(pgCameraObject *self, PyObject *args);
PyObject *
camera_set_controls(pgCameraObject *self, PyObject *arg, PyObject *kwds);
PyObject *
camera_get_size(pgCameraObject *self, PyObject *args);
PyObject *
camera_query_image(pgCameraObject *self, PyObject *args);
PyObject *
camera_get_image(pgCameraObject *self, PyObject *arg);
PyObject *
camera_get_raw(pgCameraObject *self, PyObject *args);
/*
* Functions available to pygame-ce users. The idea is to make these as simple
* as possible, and merely have them call functions specific to the type of
* camera being used to do all the real work. It currently just calls v4l2_*
* functions, but it could check something like self->cameratype and depending
* on the result, call v4l, v4l2, vfw, or other functions.
*/
/* colorspace() - Surface colorspace conversion */
PyObject *
surf_colorspace(PyObject *self, PyObject *arg)
{
pgSurfaceObject *surfobj, *surfobj2;
SDL_Surface *surf, *newsurf;
char *color;
int cspace;
surfobj2 = NULL;
#ifdef _MSC_VER
/* MSVC static analyzer false alarm: assure color is NULL-terminated by
* making analyzer assume it was initialised */
__analysis_assume(color = "inited");
#endif
/*get all the arguments*/
if (!PyArg_ParseTuple(arg, "O!s|O!", &pgSurface_Type, &surfobj, &color,
&pgSurface_Type, &surfobj2))
return NULL;
if (!strcmp(color, "YUV")) {
cspace = YUV_OUT;
}
else if (!strcmp(color, "HSV")) {
cspace = HSV_OUT;
}
else {
return RAISE(PyExc_ValueError, "Incorrect colorspace value");
}
surf = pgSurface_AsSurface(surfobj);
if (!surfobj2) {
newsurf = PG_CreateSurface(surf->w, surf->h, surf->format->format);
if (!newsurf) {
return NULL;
}
}
else {
newsurf = pgSurface_AsSurface(surfobj2);
}
/* check to see if the size is the same. */
if (newsurf->w != surf->w || newsurf->h != surf->h)
return RAISE(PyExc_ValueError,
"Surfaces not the same width and height.");
/* check to see if the format of the surface is the same. */
if (PG_SURF_BitsPerPixel(surf) != PG_SURF_BitsPerPixel(newsurf))
return RAISE(PyExc_ValueError, "Surfaces not the same depth");
SDL_LockSurface(newsurf);
pgSurface_Lock(surfobj);
Py_BEGIN_ALLOW_THREADS;
colorspace(surf, newsurf, cspace);
Py_END_ALLOW_THREADS;
pgSurface_Unlock(surfobj);
SDL_UnlockSurface(newsurf);
if (surfobj2) {
Py_INCREF(surfobj2);
return (PyObject *)surfobj2;
}
else
return (PyObject *)pgSurface_New(newsurf);
}
/* list_cameras() - lists cameras available on the computer */
PyObject *
list_cameras(PyObject *self, PyObject *_null)
{
#if defined(__unix__) || defined(PYGAME_WINDOWS_CAMERA)
PyObject *ret_list;
PyObject *string;
#if !defined(PYGAME_WINDOWS_CAMERA)
char **devices;
#else
WCHAR **devices;
#endif
int j, i = 0, num_devices = 0;
/* TODO for future PRs: errors in these functions are being ignored as
* of now, and an empty list is being returned by this function */
#if defined(__unix__)
devices = v4l2_list_cameras(&num_devices);
#elif defined(PYGAME_WINDOWS_CAMERA)
devices = windows_list_cameras(&num_devices);
#endif
ret_list = PyList_New(num_devices);
if (!ret_list) {
goto error;
}
for (i = 0; i < num_devices; i++) {
#if defined(PYGAME_WINDOWS_CAMERA)
string = PyUnicode_FromWideChar(devices[i], -1);
#else
string = PyUnicode_FromString(devices[i]);
#endif
if (!string) {
goto error;
}
/* steals reference to 'string' */
PyList_SET_ITEM(ret_list, i, string);
free(devices[i]);
}
free(devices);
return ret_list;
error:
/* free the remaining devices */
for (j = i; j < num_devices; j++) {
free(devices[j]);
}
free(devices);
Py_XDECREF(ret_list);
return NULL;
#else
Py_RETURN_NONE;
#endif
}
/* start() - opens, inits, and starts capturing on the camera */
PyObject *
camera_start(pgCameraObject *self, PyObject *_null)
{
#if defined(__unix__)
if (v4l2_open_device(self) == 0) {
v4l2_close_device(self);
return NULL;
}
else {
self->camera_type = CAM_V4L2;
if (v4l2_init_device(self) == 0) {
v4l2_close_device(self);
return NULL;
}
if (v4l2_start_capturing(self) == 0) {
v4l2_close_device(self);
return NULL;
}
}
#elif defined(PYGAME_WINDOWS_CAMERA)
if (self->open) { /* camera already started */
Py_RETURN_NONE;
}
if (!windows_open_device(self)) {
windows_close_device(self);
return NULL;
}
#endif
Py_RETURN_NONE;
}
/* stop() - stops capturing, uninits, and closes the camera */
PyObject *
camera_stop(pgCameraObject *self, PyObject *_null)
{
#if defined(__unix__)
if (v4l2_stop_capturing(self) == 0)
return NULL;
if (v4l2_uninit_device(self) == 0)
return NULL;
if (v4l2_close_device(self) == 0)
return NULL;
#elif defined(PYGAME_WINDOWS_CAMERA)
if (self->open) { /* camera started */
if (!windows_close_device(self))
return NULL;
}
#endif
Py_RETURN_NONE;
}
/* get_controls() - gets current values of user controls */
/* TODO: Support brightness, contrast, and other common controls */
PyObject *
camera_get_controls(pgCameraObject *self, PyObject *_null)
{
#if defined(__unix__)
int value;
if (v4l2_get_control(self->fd, V4L2_CID_HFLIP, &value))
self->hflip = value;
if (v4l2_get_control(self->fd, V4L2_CID_VFLIP, &value))
self->vflip = value;
if (v4l2_get_control(self->fd, V4L2_CID_BRIGHTNESS, &value))
self->brightness = value;
return Py_BuildValue("(NNN)", PyBool_FromLong(self->hflip),
PyBool_FromLong(self->vflip),
PyLong_FromLong(self->brightness));
#elif defined(PYGAME_WINDOWS_CAMERA)
return Py_BuildValue("(NNN)", PyBool_FromLong(self->hflip),
PyBool_FromLong(self->vflip), PyLong_FromLong(-1));
#endif
Py_RETURN_NONE;
}
/* set_controls() - changes camera settings if supported by the camera */
PyObject *
camera_set_controls(pgCameraObject *self, PyObject *arg, PyObject *kwds)
{
#if defined(__unix__)
int hflip = 0, vflip = 0, brightness = 0;
char *kwids[] = {"hflip", "vflip", "brightness", NULL};
camera_get_controls(self, NULL);
hflip = self->hflip;
vflip = self->vflip;
brightness = self->brightness;
if (!PyArg_ParseTupleAndKeywords(arg, kwds, "|iii", kwids, &hflip, &vflip,
&brightness))
return NULL;
/* #if defined(__unix__) */
if (v4l2_set_control(self->fd, V4L2_CID_HFLIP, hflip))
self->hflip = hflip;
if (v4l2_set_control(self->fd, V4L2_CID_VFLIP, vflip))
self->vflip = vflip;
if (v4l2_set_control(self->fd, V4L2_CID_BRIGHTNESS, brightness))
self->brightness = brightness;
return Py_BuildValue("(NNN)", PyBool_FromLong(self->hflip),
PyBool_FromLong(self->vflip),
PyLong_FromLong(self->brightness));
#elif defined(PYGAME_WINDOWS_CAMERA)
int hflip = 0, vflip = 0, brightness = 0;
char *kwids[] = {"hflip", "vflip", "brightness", NULL};
hflip = self->hflip;
vflip = self->vflip;
brightness = -1;
if (!PyArg_ParseTupleAndKeywords(arg, kwds, "|iii", kwids, &hflip, &vflip,
&brightness))
return NULL;
self->hflip = hflip;
self->vflip = vflip;
return Py_BuildValue("(NNN)", PyBool_FromLong(self->hflip),
PyBool_FromLong(self->vflip), PyLong_FromLong(-1));
#endif
Py_RETURN_NONE;
}
/* get_size() - returns the dimensions of the images being recorded */
PyObject *
camera_get_size(pgCameraObject *self, PyObject *_null)
{
#if defined(__unix__) || defined(PYGAME_WINDOWS_CAMERA)
return pg_tuple_couple_from_values_int(self->width, self->height);
#endif
Py_RETURN_NONE;
}
/* query_image() - checks if a frame is ready */
PyObject *
camera_query_image(pgCameraObject *self, PyObject *_null)
{
#if defined(__unix__)
return PyBool_FromLong(v4l2_query_buffer(self));
#elif defined(PYGAME_WINDOWS_CAMERA)
int ready;
if (!windows_frame_ready(self, &ready))
return NULL;
return PyBool_FromLong(ready);
#endif
Py_RETURN_TRUE;
}
/* get_image() - returns an RGB Surface */
/* code to reuse Surface from René Dudfield */
PyObject *
camera_get_image(pgCameraObject *self, PyObject *arg)
{
#if defined(__unix__)
SDL_Surface *surf = NULL;
pgSurfaceObject *surfobj = NULL;
int ret, errno_code = 0;
if (!PyArg_ParseTuple(arg, "|O!", &pgSurface_Type, &surfobj))
return NULL;
if (!surfobj) {
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
surf =
PG_CreateSurface(self->width, self->height, SDL_PIXELFORMAT_RGB24);
#else
surf =
PG_CreateSurface(self->width, self->height, SDL_PIXELFORMAT_BGR24);
#endif
}
else {
surf = pgSurface_AsSurface(surfobj);
}
if (!surf)
return NULL;
if (surf->w != self->width || surf->h != self->height) {
return RAISE(PyExc_ValueError,
"Destination surface not the correct width or height.");
}
Py_BEGIN_ALLOW_THREADS;
ret = v4l2_read_frame(self, surf, &errno_code);
Py_END_ALLOW_THREADS;
if (!ret) {
/* error occurred */
if (errno_code) {
PyErr_Format(PyExc_SystemError,
"ioctl(VIDIOC_DQBUF) failure : %d, %s", errno_code,
strerror(errno_code));
return NULL;
}
return RAISE(PyExc_SystemError, "image processing error");
}
if (surfobj) {
Py_INCREF(surfobj);
return (PyObject *)surfobj;
}
else {
return (PyObject *)pgSurface_New(surf);
}
#elif defined(PYGAME_WINDOWS_CAMERA)
SDL_Surface *surf = NULL;
pgSurfaceObject *surfobj = NULL;
int width = self->width;
int height = self->height;
if (!PyArg_ParseTuple(arg, "|O!", &pgSurface_Type, &surfobj))
return NULL;
if (!surfobj) {
surf = PG_CreateSurface(width, height, SDL_PIXELFORMAT_XRGB8888);
}
else {
surf = pgSurface_AsSurface(surfobj);
}
if (!surf)
return NULL;
if (surf->w != self->width || surf->h != self->height) {
return RAISE(PyExc_ValueError,
"Destination surface not the correct width or height.");
}
if (!windows_read_frame(self, surf))
return NULL;
if (surfobj) {
Py_INCREF(surfobj);
return (PyObject *)surfobj;
}
else {
return (PyObject *)pgSurface_New(surf);
}
#endif
Py_RETURN_NONE;
}
/* get_raw() - returns an unmodified image as a string from the buffer */
PyObject *
camera_get_raw(pgCameraObject *self, PyObject *_null)
{
#if defined(__unix__)
return v4l2_read_raw(self);
#elif defined(PYGAME_WINDOWS_CAMERA)
return windows_read_raw(self);
#endif
Py_RETURN_NONE;
}
/*
* Pixelformat conversion functions
*/
/* converts from rgb Surface to yuv or hsv */
/* TODO: Allow for conversion from yuv and hsv to all */
void
colorspace(SDL_Surface *src, SDL_Surface *dst, int cspace)
{
switch (cspace) {
case YUV_OUT:
rgb_to_yuv(src->pixels, dst->pixels, src->h * src->w, 0,
src->format);
break;
case HSV_OUT:
rgb_to_hsv(src->pixels, dst->pixels, src->h * src->w, 0,
src->format);
break;
}
}
/* converts pretty directly if its already RGB24 */
void
rgb24_to_rgb(const void *src, void *dst, int length, SDL_PixelFormat *format)
{
Uint8 *s = (Uint8 *)src;
Uint8 *d8;
Uint16 *d16;
Uint32 *d32;
Uint8 r, g, b;
int rshift, gshift, bshift, rloss, gloss, bloss;
rshift = format->Rshift;
gshift = format->Gshift;
bshift = format->Bshift;
rloss = format->Rloss;
gloss = format->Gloss;
bloss = format->Bloss;
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
d8 = (Uint8 *)dst;
while (length--) {
r = *s++;
g = *s++;
b = *s++;
*d8++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
case 2:
d16 = (Uint16 *)dst;
while (length--) {
r = *s++;
g = *s++;
b = *s++;
*d16++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
case 3:
d8 = (Uint8 *)dst;
while (length--) {
*d8++ = *(s + 2); /* blue */
*d8++ = *(s + 1); /* green */
*d8++ = *s; /* red */
s += 3;
}
break;
default:
d32 = (Uint32 *)dst;
while (length--) {
r = *s++;
g = *s++;
b = *s++;
*d32++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
}
}
/* slight variation on rgb24_to_rgb, just drops the 4th byte of each pixel,
* changes the R, G, B ordering. */
void
bgr32_to_rgb(const void *src, void *dst, int length, SDL_PixelFormat *format)
{
Uint8 *s = (Uint8 *)src;
Uint8 *d8;
Uint16 *d16;
Uint32 *d32;
Uint8 r, g, b;
int rshift, gshift, bshift, rloss, gloss, bloss;
rshift = format->Rshift;
gshift = format->Gshift;
bshift = format->Bshift;
rloss = format->Rloss;
gloss = format->Gloss;
bloss = format->Bloss;
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
d8 = (Uint8 *)dst;
while (length--) {
b = *s++;
g = *s++;
r = *s++;
s++;
*d8++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
case 2:
d16 = (Uint16 *)dst;
while (length--) {
b = *s++;
g = *s++;
r = *s++;
s++;
*d16++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
case 3:
d8 = (Uint8 *)dst;
while (length--) {
*d8++ = *s; /* red */
*d8++ = *(s + 1); /* green */
*d8++ = *(s + 2); /* blue */
s += 4;
}
break;
default:
d32 = (Uint32 *)dst;
while (length--) {
b = *s++;
g = *s++;
r = *s++;
s++;
*d32++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
}
}
/* converts packed rgb to packed hsv. formulas modified from wikipedia */
void
rgb_to_hsv(const void *src, void *dst, int length, unsigned long source,
SDL_PixelFormat *format)
{
Uint8 *s8, *d8;
Uint16 *s16, *d16;
Uint32 *s32, *d32;
Uint8 r, g, b, p1, p2, h, s, v, max, min, delta;
int rshift, gshift, bshift, rloss, gloss, bloss;
s8 = (Uint8 *)src;
s16 = (Uint16 *)src;
s32 = (Uint32 *)src;
d8 = (Uint8 *)dst;
d16 = (Uint16 *)dst;
d32 = (Uint32 *)dst;
rshift = format->Rshift;
gshift = format->Gshift;
bshift = format->Bshift;
rloss = format->Rloss;
gloss = format->Gloss;
bloss = format->Bloss;
/* you could stick the if statement inside the loop, but I'm sacrificing a
a few hundred bytes for a little performance */
/* 10 yrs later... about that... */
if (source == V4L2_PIX_FMT_RGB444 || source == V4L2_PIX_FMT_RGB24 ||
source == V4L2_PIX_FMT_XBGR32) {
while (length--) {
if (source == V4L2_PIX_FMT_RGB444) {
p1 = *s8++;
p2 = *s8++;
b = p2 << 4;
g = p1 & 0xF0;
r = p1 << 4;
}
else if (source == V4L2_PIX_FMT_RGB24) {
r = *s8++;
g = *s8++;
b = *s8++;
}
else {
b = *s8++;
g = *s8++;
r = *s8++;
s8++;
}
max = MAX(MAX(r, g), b);
min = MIN(MIN(r, g), b);
delta = max - min;
v = max; /* value (similar to luminosity) */
if (!delta) { /* gray, zero hue and saturation */
s = 0;
h = 0;
}
else {
s = 255 * delta / max; /* saturation */
if (r == max) { /* set hue based on max color */
h = 43 * (g - b) / delta;
}
else if (g == max) {
h = 85 + 43 * (b - r) / delta;
}
else {
h = 170 + 43 * (r - g) / delta;
}
}
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
*d8++ = ((h >> rloss) << rshift) |
((s >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
case 2:
*d16++ = ((h >> rloss) << rshift) |
((s >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
case 3:
*d8++ = v;
*d8++ = s;
*d8++ = h;
break;
default:
*d32++ = ((h >> rloss) << rshift) |
((s >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
}
}
}
else { /* for use as stage 2 in yuv or bayer to hsv, r and b switched */
while (length--) {
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
r = *s8 >> rshift << rloss;
g = *s8 >> gshift << gloss;
b = *s8++ >> bshift << bloss;
break;
case 2:
r = *s16 >> rshift << rloss;
g = *s16 >> gshift << gloss;
b = *s16++ >> bshift << bloss;
break;
case 3:
b = *s8++;
g = *s8++;
r = *s8++;
break;
default:
r = *s32 >> rshift << rloss;
g = *s32 >> gshift << gloss;
b = *s32++ >> bshift << bloss;
break;
}
max = MAX(MAX(r, g), b);
min = MIN(MIN(r, g), b);
delta = max - min;
v = max; /* value (similar to luminosity) */
if (!delta) { /* gray, zero hue and saturation */
s = 0;
h = 0;
}
else {
s = 255 * delta / max; /* saturation */
if (r == max) { /* set hue based on max color */
h = 43 * (g - b) / delta;
}
else if (g == max) {
h = 85 + 43 * (b - r) / delta;
}
else {
h = 170 + 43 * (r - g) / delta;
}
}
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
*d8++ = ((h >> rloss) << rshift) |
((s >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
case 2:
*d16++ = ((h >> rloss) << rshift) +
((s >> gloss) << gshift) +
((v >> bloss) << bshift);
break;
case 3:
*d8++ = v;
*d8++ = s;
*d8++ = h;
break;
default:
*d32++ = ((h >> rloss) << rshift) |
((s >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
}
}
}
}
/* convert packed rgb to yuv. Note that unlike many implementations of YUV,
this has a full range of 0-255 for Y, not 16-235. Formulas from wikipedia */
void
rgb_to_yuv(const void *src, void *dst, int length, unsigned long source,
SDL_PixelFormat *format)
{
Uint8 *s8, *d8;
Uint16 *s16, *d16;
Uint32 *s32, *d32;
Uint8 r, g, b, y, u, v;
Uint8 p1, p2;
int rshift, gshift, bshift, rloss, gloss, bloss;
s8 = (Uint8 *)src;
s16 = (Uint16 *)src;
s32 = (Uint32 *)src;
d8 = (Uint8 *)dst;
d16 = (Uint16 *)dst;
d32 = (Uint32 *)dst;
rshift = format->Rshift;
gshift = format->Gshift;
bshift = format->Bshift;
rloss = format->Rloss;
gloss = format->Gloss;
bloss = format->Bloss;
if (source == V4L2_PIX_FMT_RGB444 || source == V4L2_PIX_FMT_RGB24 ||
source == V4L2_PIX_FMT_XBGR32) {
while (length--) {
if (source == V4L2_PIX_FMT_RGB444) {
p1 = *s8++;
p2 = *s8++;
b = p2 << 4;
g = p1 & 0xF0;
r = p1 << 4;
}
else if (source == V4L2_PIX_FMT_RGB24) {
r = *s8++;
g = *s8++;
b = *s8++;
}
else {
b = *s8++;
g = *s8++;
r = *s8++;
s8++;
}
v = ((112 * r - 94 * g - 18 * b + 128) >> 8) + 128; /* V */
u = ((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128; /* U */
y = (77 * r + 150 * g + 29 * b + 128) >> 8; /* Y */
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
*d8++ = ((y >> rloss) << rshift) |
((u >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
case 2:
*d16++ = ((y >> rloss) << rshift) |
((u >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
case 3:
*d8++ = v;
*d8++ = u;
*d8++ = y;
break;
default:
*d32++ = ((y >> rloss) << rshift) |
((u >> gloss) << gshift) |
((v >> bloss) << bshift);
break;
}
}
}
else { /* for use as stage 2 in bayer to yuv, r and b switched */
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
while (length--) {
r = *s8 >> rshift << rloss;
g = *s8 >> gshift << gloss;
b = *s8++ >> bshift << bloss;
*d8++ =
((((77 * r + 150 * g + 29 * b + 128) >> 8) >> rloss)
<< rshift) |
(((((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128) >>
gloss)
<< gshift) |
(((((112 * r - 94 * g - 18 * b + 128) >> 8) + 128) >>
bloss)
<< bshift);
}
break;
case 2:
while (length--) {
r = *s16 >> rshift << rloss;
g = *s16 >> gshift << gloss;
b = *s16++ >> bshift << bloss;
*d16++ =
((((77 * r + 150 * g + 29 * b + 128) >> 8) >> rloss)
<< rshift) |
(((((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128) >>
gloss)
<< gshift) |
(((((112 * r - 94 * g - 18 * b + 128) >> 8) + 128) >>
bloss)
<< bshift);
}
break;
case 3:
while (length--) {
b = *s8++;
g = *s8++;
r = *s8++;
*d8++ = ((112 * r - 94 * g - 18 * b + 128) >> 8) + 128;
*d8++ = ((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128;
*d8++ = (77 * r + 150 * g + 29 * b + 128) >> 8;
}
break;
default:
while (length--) {
r = *s32 >> rshift << rloss;
g = *s32 >> gshift << gloss;
b = *s32++ >> bshift << bloss;
*d32++ =
((((77 * r + 150 * g + 29 * b + 128) >> 8) >> rloss)
<< rshift) |
(((((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128) >>
gloss)
<< gshift) |
(((((112 * r - 94 * g - 18 * b + 128) >> 8) + 128) >>
bloss)
<< bshift);
}
break;
}
}
}
/* Converts from rgb444 (R444) to rgb24 (RGB3) */
void
rgb444_to_rgb(const void *src, void *dst, int length, SDL_PixelFormat *format)
{
Uint8 *s, *d8;
Uint16 *d16;
Uint32 *d32;
Uint8 p1, p2, r, g, b;
int rshift, gshift, bshift, rloss, gloss, bloss;
s = (Uint8 *)src;
rshift = format->Rshift;
gshift = format->Gshift;
bshift = format->Bshift;
rloss = format->Rloss;
gloss = format->Gloss;
bloss = format->Bloss;
switch (PG_FORMAT_BytesPerPixel(format)) {
case 1:
d8 = (Uint8 *)dst;
while (length--) {
r = *s << 4;
g = *s++ & 0xF0;
b = *s++ << 4;
*d8++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
case 2:
d16 = (Uint16 *)dst;
while (length--) {
r = *s << 4;
g = *s++ & 0xF0;
b = *s++ << 4;
*d16++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
case 3:
d8 = (Uint8 *)dst;
while (length--) {
p1 = *s++;
p2 = *s++;
*d8++ = p2 << 4; /* blue */
*d8++ = p1 & 0xF0; /* green */
*d8++ = p1 << 4; /* red */
}
break;
default:
d32 = (Uint32 *)dst;
while (length--) {
r = *s << 4;
g = *s++ & 0xF0;
b = *s++ << 4;
*d32++ = ((r >> rloss) << rshift) | ((g >> gloss) << gshift) |
((b >> bloss) << bshift);
}
break;
}
}
/* convert from 4:2:2 YUYV interlaced to RGB */
/* colorspace conversion routine from libv4l. Licensed LGPL 2.1
(C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl> */
void
yuyv_to_rgb(const void *src, void *dst, int length, SDL_PixelFormat *format)
{
Uint8 *s, *d8;
Uint16 *d16;
Uint32 *d32;
int i;
int r1, g1, b1, r2, b2, g2;
int rshift, gshift, bshift, rloss, gloss, bloss, y1, y2, u, v, u1, rg, v1;
rshift = format->Rshift;
gshift = format->Gshift;
bshift = format->Bshift;
rloss = format->Rloss;
gloss = format->Gloss;
bloss = format->Bloss;
d8 = (Uint8 *)dst;
d16 = (Uint16 *)dst;