void Preview::captureFrame()
{
if (poll(&wc->fpolls, 1, 50) > 0) {
// dequeue buffer
if (ioctl(wc->fd, VIDIOC_DQBUF, &wc->buffer) == 0) {
QVideoFrame vframe( pixelformat, QSize(preview_buffer_width, preview_buffer_height),
reinterpret_cast<uchar*>(preview_buffer_data));
emit frameReady(vframe);
int ret = ioctl(wc->fd, VIDIOC_QBUF, &wc->buffer);
// queue up next buffer
if(ret == -1) {
if(errno == EAGAIN) {
qDebug()<<"nonblocking io slected O_NONBLOCK and no buffer was in outgoing queue";
} else if(errno == EINVAL) {
qDebug()<<"buffer type not supported or index OOB or no buffers have been alloced";
}else if(errno == ENOMEM) {
qDebug()<<"insufficient memory";
}else if(errno == EIO) {
qDebug()<<"internal error";
}
}
}
}
}
// --- next_older ------------------------------------------------------------
// Skip to the next visible Java frame.
// Makes visible inlined compiled frames.
// Skips non-Java frames.
vframe vframe::next_older() const {
assert(!done(),"asking for next but there is no next vframe");
// Can we walk up inlined Java frames?
if(_fr.is_compiled_frame()){
const DebugScope *ds = scope();
if( ds->caller() ) return vframe(_fr,ds->caller(),_sbafid); // Next virtual caller
}
// Time to skip a real physical frame
frame fr = _fr.sender();
int sbafid = _sbafid;
while( 1 ) {
Untested("");
if( fr.is_java_frame() || fr.is_first_frame() ) {
#ifdef ASSERT
assert(!_fr.is_runtime_frame(), "unexpected runtime stub");
#endif
return vframe(fr, LAZY_DEBUG, sbafid);
}
if( fr.is_entry_frame() ) sbafid--; // Each entry frame pushes an SBA frame
fr = fr.sender();
}
}
void V4L1Preview::captureFrame()
{
// Start capturing the next frame (we alternate between 0 and 1).
int frame = wc->currentFrame;
struct video_mmap capture;
if ( wc->mbuf.frames > 1 ) {
wc->currentFrame = !wc->currentFrame;
capture.frame = wc->currentFrame;
capture.width = wc->width;
capture.height = wc->height;
capture.format = VIDEO_PALETTE_RGB32;
ioctl( wc->fd, VIDIOCMCAPTURE, &capture );
}
// Wait for the current frame to complete.
ioctl( wc->fd, VIDIOCSYNC, &frame );
preview_buffer_width = wc->width;
preview_buffer_height = wc->height;
preview_buffer_data = wc->frames + wc->mbuf.offsets[frame];
QVideoFrame vframe(QVideoFrame::Format_RGB32, QSize(wc->width, wc->height),
reinterpret_cast<uchar*>(preview_buffer_data));
emit frameReady(vframe);
// Queue up another frame if the device only supports one at a time.
if ( wc->mbuf.frames <= 1 ) {
capture.frame = wc->currentFrame;
capture.width = wc->width;
capture.height = wc->height;
capture.format = VIDEO_PALETTE_RGB32;
ioctl( wc->fd, VIDIOCMCAPTURE, &capture );
}
}