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SimpleSkyCam/videodev.cc

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/***************************************************************************************
*
* videodev.cc is part of SimpleSkyCam.
*
*****************************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <errno.h>
#include <getopt.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <jpeglib.h>
#include <list>
#include <string>
#include <setjmp.h>
#include "gui.h"
#include "video.h"
#define CLEAR(x) memset (&(x), 0, sizeof (x))
//
// jpeg: replacement for error_exit
//
METHODDEF(void) jpg_error_exit (j_common_ptr cinfo) {
jpg_error_ptr myerr = (jpg_error_ptr) cinfo->err;
(*cinfo->err->output_message) (cinfo);
longjmp(myerr->setjmp_buffer, 1);
}
//
// clamp and convert2rgb is build on the sample of the v4l2 api documentation
//
inline unsigned char clamp (double x) {
int r = (int)x;
if (r < 0) return 0;
else if (r > 255) return 255;
else return r;
};
inline void convert2rgb (unsigned char Y1, unsigned char Cb, unsigned char Cr,
unsigned char *ER, unsigned char *EB, unsigned char *EG) {
register int y1, pb, pr;
y1 = Y1 - 16;
pb = Cb - 128;
pr = Cr - 128;
*ER = clamp (y1 + 1.402 * pr);
*EB = clamp (y1 - 0.344 * pb - 0.714 * pr);
*EG = clamp (y1 + 1.772 * pb);
};
//
// C / C++ Wrapper for the thread function
//
gpointer _VideoDevThread (gpointer data) {
videodev.Thread ();
return NULL;
};
VideoDev::VideoDev() {
inbuffer.size = 0;
inbuffer.data = NULL;
running = 0;
callback = NULL;
thread = NULL;
fd = -1;
io = IOMODE_MMAP;
CLEAR(cropcap);
CLEAR(crop);
CLEAR(fmt);
g_mutex_init (&mutex);
Close(); // will reset almost everything
};
VideoDev::~VideoDev() {
Stop();
}
//
// return list of devices in form of /dev/videoYY [Name]
//
int VideoDev::GetDeviceList(std::list<std::string> *list) {
std::string device;
int devnum;
if (list == NULL) return 0;
list->clear();
for (devnum = 0; devnum < 255; devnum++) {
device = "/dev/video"+std::to_string(devnum);
if (device.compare (conf_device) != 0) {
int fd;
struct v4l2_capability vcap;
if((fd = open(device.c_str(), O_RDONLY)) == -1){
continue;
}
if(ioctl(fd, VIDIOC_QUERYCAP, &vcap) == -1)
strncpy ((char*)&vcap.card, "unknown", sizeof(vcap.card));
close(fd);
device += " [" + (std::string) ((char*)vcap.card) + "]";
}
else {
device += " [" + (std::string) conf_devicename + "]";
}
list->push_back(device);
}
return 1;
}
//
// start the video thread (on error, call cb_thread_videodev with NULL data)
//
int VideoDev::Start(std::string dev, gboolean (*callback_func)(gpointer data)) {
if (running != 0 || thread != NULL) return VDEV_STATUS_ERROR;
running = 1;
conf_device = dev;
callback = callback_func;
thread = g_thread_new("VideoDev", _VideoDevThread, NULL);
return VDEV_STATUS_ERROR;
};
int VideoDev::Stop() {
if (running == 1) {
running = 0;
}
if (thread) {
g_thread_join (thread);
thread = NULL;
}
return VDEV_STATUS_OK;
};
//
// try to read a video every 0.05ms (25hz)
//
#define CYCLETIME 0.050
void VideoDev::Thread() {
struct timeval cycle_timestamp;
int lastsec = 0;
float cycle_time, cycle_wait;
int i;
fd_set fds;
struct timeval tv;
VideoFrame vf;
printf ("%s:%d %s Enter\n", __FILE__, __LINE__, __FUNCTION__);
cycle_time = get_cycletime(&cycle_timestamp); // just start counting
//
// open and init device buffers device
if (OpenInit() != VDEV_STATUS_OK) {
printf ("%s:%d %s something went wrong on Open()\n", __FILE__, __LINE__, __FUNCTION__);
running = 0;
}
//
// start capturing
if (CaptureStart() != VDEV_STATUS_OK) running = 0;
//
// read untill something bad happens..
while (running > 0) {
i = Grab(&vf);
switch (i) {
case VDEV_STATUS_OK:
if (callback) gdk_threads_add_idle(callback, &vf);
break;
case VDEV_STATUS_AGAIN:
break;
default:
running = 0;
}
//
// keep 25fps, write every second a message
cycle_time = get_cycletime(&cycle_timestamp);
cycle_wait = (CYCLETIME - cycle_time) + cycle_wait;
if (lastsec != cycle_timestamp.tv_sec) {
printf ("%s:%d %s cycle_time:%f Freq:%f Hz \r", __FILE__, __LINE__, __FUNCTION__, cycle_time, (1.0/cycle_time));
lastsec = cycle_timestamp.tv_sec;
}
if (cycle_wait > 0.0 && cycle_wait < 1.0 ) usleep ((int)(cycle_wait * 1000000.0));
}
//
// stop capturing
CaptureStop();
UnInit();
if (callback) gdk_threads_add_idle(callback, NULL);
Close();
printf ("%s:%d %s Exit\n", __FILE__, __LINE__, __FUNCTION__);
};
void VideoDev::PrintCaps(uint32_t caps) {
printf ("%s:%d %s Caps: %x\n", __FILE__, __LINE__, __FUNCTION__, caps);
if (caps & V4L2_CAP_VIDEO_CAPTURE) printf (" V4L2_CAP_VIDEO_CAPTURE\n");
if (caps & V4L2_CAP_EXT_PIX_FORMAT) printf (" V4L2_CAP_EXT_PIX_FORMAT\n");
if (caps & V4L2_CAP_META_CAPTURE) printf (" V4L2_CAP_META_CAPTURE\n");
if (caps & V4L2_CAP_STREAMING) printf (" V4L2_CAP_STREAMING\n");
if (caps & V4L2_CAP_DEVICE_CAPS) printf (" V4L2_CAP_DEVICE_CAPS\n");
if (caps & V4L2_CAP_TUNER) printf (" V4L2_CAP_TUNER\n");
if (caps & V4L2_CAP_MODULATOR) printf (" V4L2_CAP_MODULATOR\n");
if (caps & V4L2_CAP_READWRITE) printf (" V4L2_CAP_READWRITE\n");
if (caps & V4L2_CAP_ASYNCIO) printf (" V4L2_CAP_ASYNCIO\n");
}
void VideoDev::PrintFmt(struct v4l2_format *f) {
printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
printf (" type : %u\n", f->type);
printf (" fmt.pix.width : %d\n", f->fmt.pix.width);
printf (" fmt.pix.height : %d\n", f->fmt.pix.height);
printf (" fmt.fmt.pix.pixelformat : %c%c%c%c\n", ((char*)&fmt.fmt.pix.pixelformat)[0],
((char*)&fmt.fmt.pix.pixelformat)[1],
((char*)&fmt.fmt.pix.pixelformat)[2],
((char*)&fmt.fmt.pix.pixelformat)[3]);
printf (" fmt.pix.field : %d\n", f->fmt.pix.field);
printf (" fmt.pix.bytesperline : %d\n", f->fmt.pix.bytesperline);
printf (" fmt.pix.sizeimage : %d\n", f->fmt.pix.sizeimage);
}
int VideoDev::Grab(VideoFrame *vf) {
struct v4l2_buffer buf;
int len;
if (vf == NULL) return VDEV_STATUS_ERROR;
switch (io) {
case IOMODE_READ:
if ((len = read (fd, inbuffer.data, fmt.fmt.pix.sizeimage)) == -1) {
switch (errno) {
case EAGAIN:
return VDEV_STATUS_AGAIN;
case EIO:
default:
printf ("v4l2_grab IOM_READ: %s dest:%p size:%d\n", strerror (errno), vf[vf_rec].data, fmt.fmt.pix.sizeimage);
return VDEV_STATUS_ERROR;
}
}
else
Convert(vf, inbuffer.data, len, fmt.fmt.pix.pixelformat, fmt.fmt.pix.width, fmt.fmt.pix.height);
break;
case IOMODE_MMAP:
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
switch (errno) {
case EAGAIN:
return VDEV_STATUS_AGAIN;
case EIO:
printf ( "%s:%d error on VIDIOC_DQBUF EIO %s\n", __FILE__, __LINE__, strerror(errno));
/* Could ignore EIO, see spec. */
/* fall through */
default:
printf ( "%s:%d error on VIDIOC_DQBUF %s\n", __FILE__, __LINE__, strerror(errno));
return VDEV_STATUS_ERROR;
}
}
// printf ("%s:%d DQBUF used:%d field:%d flags:%d index:%d len:%d seq:%d mem:%d\n", __FILE__, __LINE__, buf.bytesused, buf.field,
// buf.flags, buf.index, buf.length, buf.sequence, buf.memory);
if (buf.index == 0) {
Convert(vf, inbuffer.data, buf.bytesused, fmt.fmt.pix.pixelformat, fmt.fmt.pix.width, fmt.fmt.pix.height);
}
if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) {
printf ( "%s:%d error on VIDIOC_QBUF %s\n", __FILE__, __LINE__, strerror(errno));
exit (1);
}
// printf ("%s:%d QBUF used:%d field:%d flags:%d index:%d len:%d seq:%d mem:%d\n", __FILE__, __LINE__, buf.bytesused, buf.field,
// buf.flags, buf.index, buf.length, buf.sequence, buf.memory);
break;
default:
printf ("%s:%d %s wrong IOMODE?\n", __FILE__, __LINE__, __FUNCTION__);
return VDEV_STATUS_ERROR;
}
return VDEV_STATUS_OK;
}
//
// Open Device
int VideoDev::OpenInit() {
int i;
struct v4l2_capability vcap;
printf ("%s:%d %s Device: '%s'\n", __FILE__, __LINE__, __FUNCTION__, conf_device.c_str());
if (fd != -1) return VDEV_STATUS_ERROR;
//
// open device and get device name and capabilities | O_NONBLOCK
if((fd = open(conf_device.c_str(), O_RDWR)) == -1){
return VDEV_STATUS_ERROR;
}
if(ioctl(fd, VIDIOC_QUERYCAP, &vcap) == -1)
strncpy ((char*)&vcap.card, "unknown", sizeof(vcap.card));
conf_devicename = (char*) vcap.card;
printf ("%s:%d %s Capabilities: %u\n", __FILE__, __LINE__, __FUNCTION__, vcap.capabilities);
PrintCaps(vcap.capabilities);
printf ("%s:%d %s Device Capabilities: %u\n", __FILE__, __LINE__, __FUNCTION__, vcap.device_caps);
PrintCaps(vcap.device_caps);
if (!(vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
printf ("%s:%d %s device has no video capture capabilities\n", __FILE__, __LINE__, __FUNCTION__);
return VDEV_STATUS_ERROR;
Close();
}
//
// query controls
struct v4l2_queryctrl queryctrl;
struct v4l2_control control;
uint32_t min;
printf (" Controls: \n");
memset (&queryctrl, 0, sizeof (queryctrl));
for (i = V4L2_CID_BASE; i < V4L2_CID_LASTP1; i++) {
queryctrl.id = i;
if (0 == ioctl (fd, VIDIOC_QUERYCTRL, &queryctrl)) {
if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED)
printf (" *");
memset (&control, 0, sizeof (control));
control.id = i;
ioctl (fd, VIDIOC_G_CTRL, &control);
printf (" [%d] %s:%d\n", i, queryctrl.name, control.value);
}
}
printf ("\n Private Controls: ");
for (i = V4L2_CID_PRIVATE_BASE;; i++) {
queryctrl.id = i;
if (0 == ioctl (fd, VIDIOC_QUERYCTRL, &queryctrl)) {
printf (" [%d] %s\n", i, queryctrl.name);
} else {
break;
}
}
printf ("\n");
//
// check for cropping.. if we have it setup default
CLEAR (cropcap);
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) {
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect; // reset to default
if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) {
printf ("%s:%d %s VIDEOC_S_CROP Errorcode: %s\n", __FILE__, __LINE__, __FUNCTION__, strerror(errno));
}
}
printf (" max image size: %d + %d : %d x %d fmt size:%d\n", cropcap.defrect.left, cropcap.defrect.top, cropcap.defrect.width, cropcap.defrect.height, fmt.fmt.pix.sizeimage);
CLEAR (fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
// fmt.fmt.pix.width = cropcap.defrect.width;
// fmt.fmt.pix.height = cropcap.defrect.height;
fmt.fmt.pix.width = 1920;
fmt.fmt.pix.height = 1080;
// fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB32;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) {
fprintf (stderr, "VIDIOC_S_FMT : %s", strerror (errno));
return VDEV_STATUS_ERROR;
}
// Note VIDIOC_S_FMT may change width and height.
// Buggy driver paranoia. - as written in the v4l2 api documentation
min = fmt.fmt.pix.width * 2;
if (fmt.fmt.pix.bytesperline < min)
fmt.fmt.pix.bytesperline = min;
min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
if (fmt.fmt.pix.sizeimage < min)
fmt.fmt.pix.sizeimage = min;
PrintFmt (&fmt);
// init buffers
switch (io) {
case IOMODE_MMAP:
if (InitMMap() == VDEV_STATUS_ERROR)
Close();
break;
case IOMODE_READ:
default:
break;
}
return VDEV_STATUS_OK;
};
//
// prepare memory mapped buffers
int VideoDev::InitMMap() {
struct v4l2_requestbuffers bufreq;
struct v4l2_buffer bufinfo;
printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
CLEAR(bufreq);
CLEAR(bufinfo);
bufreq.count = 1;
bufreq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
bufreq.memory = V4L2_MEMORY_MMAP;
if (-1 == xioctl(fd, VIDIOC_REQBUFS, &bufreq)) {
if (EINVAL == errno) {
printf("%s does not support "
"memory mappingn", conf_device.c_str());
return VDEV_STATUS_ERROR;
} else {
printf ("%s:%d %s Error %s\n", __FILE__, __LINE__, __FUNCTION__, strerror(errno));
return VDEV_STATUS_ERROR;
}
}
if (bufreq.count < 1) {
printf ( "Insufficient buffer memory on %s\n", conf_device.c_str());
return VDEV_STATUS_ERROR;
}
CLEAR(bufinfo);
bufinfo.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
bufinfo.memory = V4L2_MEMORY_MMAP;
bufinfo.index = 0;
if(ioctl(fd, VIDIOC_QUERYBUF, &bufinfo) < 0){
perror("VIDIOC_QUERYBUF");
exit(1);
}
inbuffer.size = bufinfo.length;
inbuffer.data = (unsigned char*)mmap(NULL, bufinfo.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, bufinfo.m.offset);
if (inbuffer.data == MAP_FAILED) {
printf ( "%s:%d error on mmap %s\n", __FILE__, __LINE__, strerror(errno));
exit (1);
}
return VDEV_STATUS_OK;
}
//
// send the start capture signal to the cam
int VideoDev::CaptureStart() {
enum v4l2_buf_type type;
printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
switch (io) {
case IOMODE_READ:
/* Nothing to do. */
break;
case IOMODE_MMAP:
struct v4l2_buffer buf;
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) {
printf ( "%s:%d error on VIDIOC_QBUF %s\n", __FILE__, __LINE__, strerror(errno));
exit (1);
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (-1 == xioctl(fd, VIDIOC_STREAMON, &type)) {
printf ( "%s:%d VIDIOC_STREAMON %s\n", __FILE__, __LINE__, strerror(errno));
return VDEV_STATUS_ERROR;
}
break;
default:
printf ("%s:%d %s wrong IOMODE?\n", __FILE__, __LINE__, __FUNCTION__);
return VDEV_STATUS_ERROR;
}
if (fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG) {
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = jpg_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
printf ("%s:%d %s JPEG Error\n", __FILE__, __LINE__, __FUNCTION__);
jpeg_destroy_decompress(&cinfo);
return VDEV_STATUS_ERROR;
}
jpeg_create_decompress(&cinfo);
}
return VDEV_STATUS_OK;
};
int VideoDev::CaptureStop() {
enum v4l2_buf_type type;
printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
if (fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG) {
jpeg_destroy_decompress(&cinfo);
}
switch (io) {
case IOMODE_READ:
/* Nothing to do. */
break;
case IOMODE_MMAP:
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type)) {
fprintf(stderr, "%s:%d VIDIOC_STREAMOFF Error:%s\n", __FILE__, __LINE__, strerror(errno));
return VDEV_STATUS_ERROR;
}
break;
default:
printf ("%s:%d %s wrong IOMODE?\n", __FILE__, __LINE__, __FUNCTION__);
return VDEV_STATUS_ERROR;
}
return VDEV_STATUS_OK;
};
int VideoDev::UnInit() {
printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
switch (io) {
case IOMODE_READ:
break;
case IOMODE_MMAP:
if (-1 == munmap(inbuffer.data, inbuffer.size)){
fprintf(stderr, "Fatal Error @ %s:%d munmap Error:%s\n", __FILE__, __LINE__, strerror(errno));
exit(1);
}
break;
default:
printf ("%s:%d %s wrong IOMODE?\n", __FILE__, __LINE__, __FUNCTION__);
return VDEV_STATUS_ERROR;
}
return VDEV_STATUS_OK;
};
//
// Close Device
// Free videobuffer
//
int VideoDev::Close() {
printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
if (fd >= 0) {
close (fd);
fd = -1;
}
conf_device = "";
conf_devicename = "";
vf_rec = -1;
vf_get = -1;
return VDEV_STATUS_OK;
};
//
// try to send ioctl command as long as EINTR is valid. But abort after 2 seconds.
//
int VideoDev::xioctl(int fd, int request, void *arg) {
int r;
int errnoioctl;
struct timeval to1;
struct timeval to2;
float to;
gettimeofday(&to1, NULL);
do {
r = ioctl(fd, request, arg);
errnoioctl = errno;
gettimeofday(&to2, NULL);
to = (float)(to2.tv_sec - to1.tv_sec) + ((to2.tv_usec - to1.tv_usec) / 1000000.0);
} while (r == -1 && errnoioctl == EINTR && to < 2.0);
return r;
};
//
// converts the video from input type to RGB24 type - 24Bit
//
int VideoDev::Convert (VideoFrame *dest, unsigned char *ptrsrc, int srcsize, uint32_t pixelformat, int srcw, int srch) {
int xs, ys;
int xd, yd;
unsigned char r,g,b;
unsigned char cb, cr, y1;
unsigned char *ptrdst = NULL;
// check if there is a destination and that the destination is large to keep
// the full image
if (dest == NULL || ptrsrc == NULL)
return VDEV_STATUS_ERROR;
if (dest->data != NULL && dest->w != srcw && dest->h != srch) {
free (dest->data);
dest->data == NULL;
}
if (dest->data == NULL) {
dest->w = srcw;
dest->h = srch;
dest->size = srcw * srch * 3;
dest->data = (unsigned char*) malloc (dest->size);
}
ptrdst = dest->data;
switch (pixelformat) {
case (V4L2_PIX_FMT_RGB32):
for (ys = 0, yd = 0; ys < (signed int)srch; ys++) {
for (xs = 0, xd = 0; xs < (signed int)srcw; xs++) {
/* read the pixel */
ptrsrc++;
r = *(ptrsrc++);
g = *(ptrsrc++);
b = *(ptrsrc++);
/* only paint the image if the source is within the destination */
if (xd < dest->w) {
/* set the pixel */
*(ptrdst++) = b;
*(ptrdst++) = g;
*(ptrdst++) = r;
xd++;
}
}
/* if the source image is too small ignore the other places.. */
if (xd < dest->w)
ptrdst += 3 * (dest->w - xd);
yd++;
}
break;
case (V4L2_PIX_FMT_BGR32):
for (ys = 0, yd = 0; ys < (signed int)srch; ys++) {
for (xs = 0, xd = 0; xs < (signed int)srcw; xs++) {
/* read the pixel */
b = *(ptrsrc++);
g = *(ptrsrc++);
r = *(ptrsrc++);
ptrsrc++;
/* only paint the image if the source is within the destination */
if (xd < dest->w) {
/* set the pixel */
*(ptrdst++) = b;
*(ptrdst++) = g;
*(ptrdst++) = r;
xd++;
}
}
/* if the source image is too small ignore the other places.. */
if (xd < dest->w)
ptrdst += 3 * (dest->w - xd);
yd++;
}
break;
case (V4L2_PIX_FMT_UYVY):
for (ys = 0, yd = 0; ys < (signed int)srch; ys++) {
for (xs = 0, xd = 0; xs < (signed int)srcw; xs++) {
/* read the pixel */
if (xs & 1) {
y1 = (unsigned char)*(ptrsrc + 1);
cr = (unsigned char)*(ptrsrc);
cb = (unsigned char)*(ptrsrc - 2);
}
else {
y1 = (unsigned char)*(ptrsrc + 1);
cr = (unsigned char)*(ptrsrc + 2);
cb = (unsigned char)*(ptrsrc);
}
convert2rgb (y1, cr, cb, &r, &g, &b);
ptrsrc += 2;
/* only paint the image if the source is within the destination */
if (xd < dest->w) {
/* set the pixel */
*(ptrdst++) = b;
*(ptrdst++) = g;
*(ptrdst++) = r;
xd++;
}
}
/* if the source image is too small ignore the other places.. */
if (xd < dest->w)
ptrdst += 3 * (dest->w - xd);
yd++;
}
break;
case (V4L2_PIX_FMT_YUYV):
for (ys = 0, yd = 0; ys < (signed int)srch; ys++) {
if (yd < dest->h) {
for (xs = 0, xd = 0; xs < (signed int)srcw; xs++) {
/* read the pixel */
if (xs & 1) {
y1 = *(ptrsrc);
cb = *(ptrsrc + 1);
cr = *(ptrsrc - 1);
}
else {
y1 = *(ptrsrc);
cb = *(ptrsrc + 3);
cr = *(ptrsrc + 1);
}
convert2rgb (y1, cr, cb, &r, &g, &b);
ptrsrc += 2;
/* only paint the image if the source is within the destination */
if (xd < dest->w) {
/* set the pixel */
*(ptrdst++) = r;
*(ptrdst++) = g;
*(ptrdst++) = b;
xd++;
}
}
/* if the source image is too small ignore the other places.. */
if (xd < dest->w)
ptrdst += 3 * (dest->w - xd);
yd++;
}
}
break;
case (V4L2_PIX_FMT_MJPEG):
jpeg_mem_src(&cinfo, ptrsrc, srcsize);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
while (cinfo.output_scanline < cinfo.output_height) {
unsigned char *temp_array[] = {ptrdst + (cinfo.output_scanline) * srcw * 3};
jpeg_read_scanlines(&cinfo, temp_array, 1);
}
jpeg_finish_decompress(&cinfo);
break;
default:
break;
}
return VDEV_STATUS_OK;
};
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