As I know,
ldd output normally looks like SHARED_LIBRARY => location.
But liblz.so.1 and libzstd.so.1 below don't seem to be so.
ldd librdkafka.so
linux-vdso.so.1 => (0x00007ffde7484000)
liblz4.so.1 (0x00007f97c8953000)
libzstd.so.1 (0x00007f97c8420000)
libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0x00007f97c8206000)
libssl.so.10 => /usr/lib64/libssl.so.10 (0x00007f97c7f99000)
libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x00007f97c7bb4000)
libz.so.1 => /lib64/libz.so.1 (0x00007f97c799e000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f97c7799000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f97c757c000)
librt.so.1 => /lib64/librt.so.1 (0x00007f97c7374000)
libc.so.6 => /lib64/libc.so.6 (0x00007f97c6fdf000)
What is the meaning of this type of output?
Psychic debugging: data and packet are the parameters of MPU6050::dmpGetAccel, and you are trying to combine four bytes into a word.
You need to do your arithmetic in uint32_ts, not uint8_ts, otherwise you always overflow the values.
Change all the lines of the form
data[n] = ((packet[m] << 24) + (packet[m+1] << 16) + (packet[m+2] << 8) + packet[m+3]);
to
data[n] = ((uint32_t{ packet[m] } << 24) + (uint32_t{ packet[m+1] } << 16) + (uint32_t{ packet[m+2] } << 8) + uint32_t{ packet[m+3] });
Related
I'm trying to write a simple program that just opens a window with GLEW 2.0 and GLFW 3, but am being met with a segfault...
Here is my source:
#include <stdio.h>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
int main(int argc, char **argv) {
const int height = 100;
const int width = 100;
if (!glfwInit()) {
printf("Glfw failed to init\n");
return -1;
}
// 4x antialiasing
glfwWindowHint(GLFW_SAMPLES, 4);
// We want OpenGL 3.3
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
// We don't want the old OpenGL
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window;
window = glfwCreateWindow(width, height, "Tutorial 01", NULL, NULL);
if (window == NULL) {
printf("GLFW Failed to open a window. "
"Intel GPUs don't support 3.3\n");
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glewExperimental = 1;
if (glewInit() != GLEW_OK) {
printf("GLEW Failed to initialize.\n");
return -1;
}
glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
do {
glfwSwapBuffers(window);
glfwPollEvents();
} while( glfwGetKey(window, GLFW_KEY_ESCAPE ) != GLFW_PRESS &&
glfwWindowShouldClose(window) == 0 );
}
I compile this with
gcc test.c -g -lGLEW -lglfw -o test
And receive a segfault upon running the program. Using gdb, a backtrace on the segfault gives
0 0x0000000000000000 in ?? ()
1 0x00007ffff7ba02a7 in glxewInit () from /usr/lib64/libGLEW.so.2.0
2 0x00007ffff7ba87a3 in glewInit () from /usr/lib64/libGLEW.so.2.0
3 0x0000555555554bd4 in main (argc=1, argv=0x7fffffffdf18) at test.c:39
I am on Ubuntu 17.04, and I installed glew/glfw with Ubuntus pacakge manager with
sudo apt-get install libglew2.0 libglew-dev libglfw3 libglfw3-dev
I was following this tutorial here. If it makes any difference, I don't have a desktop manager or a compositor running. I'm using i3wm. However, the segfault still occurs when running alongside the compton compositor.
Lastly, just so I can provide some extra info, the ldd shows the linked libraries of test as
linux-vdso.so.1 => (0x00007ffc44ce9000)
libGLEW.so.2.0 => /usr/lib64/libGLEW.so.2.0 (0x00007f8e53dc9000)
libglfw.so.3 => /usr/lib/x86_64-linux-gnu/libglfw.so.3 (0x00007f8e53b86000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8e537bf000)
libGL.so.1 => /usr/lib/nvidia-375/libGL.so.1 (0x00007f8e5351b000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f8e53313000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8e53008000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f8e52e04000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f8e52acb000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f8e528ad000)
libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f8e526a2000)
libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007f8e5249f000)
libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007f8e52297000)
libXcursor.so.1 => /usr/lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007f8e5208d000)
/lib64/ld-linux-x86-64.so.2 (0x000055e0ef28b000)
libGLX.so.0 => /usr/lib/nvidia-375/libGLX.so.0 (0x00007f8e51e5d000)
libGLdispatch.so.0 => /usr/lib/nvidia-375/libGLdispatch.so.0 (0x00007f8e51b8f000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f8e5196d000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f8e5175b000)
libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f8e5154f000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f8e51349000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f8e51145000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f8e50f3f000)
Thanks for any help.
There is a bug report saying that core profile was broken in GLEW until 2.0.0.
Thus, you should update the GLEW. If that won't work, switch to compatibility profile by replacing GLFW_OPENGL_CORE_PROFILE flag with GLFW_OPENGL_COMPAT_PROFILE.
I successfully compiled opencv_example (which is VLC video filter plugin from vlc/modules/video_filter). But it doesn't want to work on me.
I run vlc as the following:
XXX#XXX:/opt/vlc-2.0.1-td/bin$ vlc --video-filter opencv_example
VLC runs, I open the video file, it opens well (I see frames). But then the debug always answered me with:
[0x7f3bec792b78] main filter error: corrupt module: /usr/local/lib/vlc/plugins/video_filter/libopencv_example_plugin.so
[0x7f3bec1728f8] main video output error: Failed to create video filter2 'opencv_example'
[0x7f3bec1728f8] main video output error: Failed to add filter 'opencv_example'
[0x7f3bee4b1a88] main filter error: corrupt module: /usr/local/lib/vlc/plugins/video_filter/libopencv_example_plugin.so
[0x7f3bec1728f8] main video output error: Failed to create video filter2 'opencv_example'
[0x7f3bec1728f8] main video output error: Failed to add filter 'opencv_example'
I found out that it may be linking error, since when I run ldd util, I can't see the reference to any opencv library among the libraries, used by libopencv_example_plugin.so:
XXX#XXX:/usr/local/lib/vlc/plugins/video_filter$ ldd libopencv_example_plugin.so
linux-vdso.so.1 => (0x00007fff947ff000)
libvlccore.so.5 => /usr/local/lib/libvlccore.so.5 (0x00007f9c1b92c000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f9c1b56c000)
libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f9c1b327000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f9c1b11f000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f9c1af02000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f9c1acfd000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f9c1aa01000)
/lib64/ld-linux-x86-64.so.2 (0x00007f9c1be31000)
So. The question is listed above: how can I make opencv_example work?
I'm working on Ubuntu 12.04 with VLC 2.0.1, OpenCV 2.4.9
Thanks in advance for everyone!
Finally dealed with that die hard. The problem of running opencv_example is complex, so there are two steps to solve it:
1 Link necessary OpenCV libraries
My initial thought was true: failure in creating VLC video filter is caused by unlinked OpenCV libraries.
To link them open configure.ac for writing. Then find the following line:
PKG_ENABLE_MODULES_VLC([OPENCV], [opencv_example opencv_wrapper], [opencv], (OpenCV (computer vision) filter), [off])
This exact line tells VLC NOT to link OpenCV to opencv_example and opencv_wrapper. So change it and add some more lines to check the availability of CV-functions:
PKG_ENABLE_MODULES_VLC([OPENCV], [opencv_example opencv_wrapper], [opencv], (OpenCV (computer vision) filter), [on])
AC_MSG_CHECKING([opencv libs for opencv_example & opencv_wrapper])
AC_CHECK_LIB(opencv_objdetect, cvHaarDetectObjects,
[
VLC_ADD_PLUGIN([opencv_wrapper opencv_example])
VLC_ADD_CFLAGS([opencv_wrapper opencv_example], [$OPENCV_CFLAGS])
VLC_ADD_LIBS([opencv_wrapper opencv_example],[-lopencv_core -lopencv_objdetect])
AC_MSG_RESULT([opencv libs added, cvHaarDetectObjects is ok])
],
AC_MSG_ERROR([opencv libs for opencv_example & opencv_wrapper cannot be added!]))
Save this file, go back to VLC directory and do the following operations:
autoconf
./configure
make
make install
When running ./configure, among the other information your terminal should show:
checking opencv libs for opencv_example & opencv_wrapper...
checking for cvHaarDetectObjects in -lopencv_objdetect... yes
This is a good sing means that OpenCV is installed and VLC is ready to link it to our plugins.
After installing everything (make install) check linkage by running ldd utility in /usr/local/lib/vlc/plugins/video_filter directory (or whereever your VLC-plugins are installed):
XXX#XXX:/usr/local/lib/vlc/plugins/video_filter# ldd libopencv_example_plugin.so
linux-vdso.so.1 => (0x00007fff549cd000)
libvlccore.so.5 => /usr/local/lib/libvlccore.so.5 (0x00007f036aa2a000)
libopencv_core.so.2.4 => /usr/local/lib/libopencv_core.so.2.4 (0x00007f036a5e8000)
libopencv_objdetect.so.2.4 => /usr/local/lib/libopencv_objdetect.so.2.4 (0x00007f036a367000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0369fa7000)
libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f0369d63000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f0369b5a000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f036993d000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0369739000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f036943c000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f0369225000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f0368f25000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0368d0e000)
libopencv_imgproc.so.2.4 => /usr/local/lib/libopencv_imgproc.so.2.4 (0x00007f036884c000)
libopencv_highgui.so.2.4 => /usr/local/lib/libopencv_highgui.so.2.4 (0x00007f03684ae000)
/lib64/ld-linux-x86-64.so.2 (0x00007f036af2f000)
libjpeg.so.8 => /usr/lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007f036825d000)
libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0 (0x00007f0368035000)
libtiff.so.4 => /usr/lib/x86_64-linux-gnu/libtiff.so.4 (0x00007f0367dd0000)
libgtk-x11-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 (0x00007f0367796000)
libgdk-x11-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 (0x00007f03674e4000)
libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f0367294000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f0366f9f000)
libdc1394.so.22 => /usr/lib/x86_64-linux-gnu/libdc1394.so.22 (0x00007f0366d2c000)
libv4l1.so.0 => /usr/lib/x86_64-linux-gnu/libv4l1.so.0 (0x00007f0366b25000)
libavcodec.so.53 => /usr/lib/x86_64-linux-gnu/libavcodec.so.53 (0x00007f0365d15000)
libavformat.so.53 => /usr/lib/x86_64-linux-gnu/libavformat.so.53 (0x00007f0365a15000)
libavutil.so.51 => /usr/lib/x86_64-linux-gnu/libavutil.so.51 (0x00007f03657f4000)
libswscale.so.2 => /usr/lib/x86_64-linux-gnu/libswscale.so.2 (0x00007f03655ae000)
libpangocairo-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so.0 (0x00007f03653a1000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f036506c000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f0364e66000)
libatk-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libatk-1.0.so.0 (0x00007f0364c43000)
libcairo.so.2 => /usr/lib/x86_64-linux-gnu/libcairo.so.2 (0x00007f0364985000)
libgdk_pixbuf-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0 (0x00007f0364765000)
libgio-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 (0x00007f0364415000)
libpangoft2-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so.0 (0x00007f03641eb000)
libpango-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0 (0x00007f0363fa2000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f0363d6b000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f0363b5a000)
libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f0363950000)
libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007f036374c000)
libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007f036353d000)
libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f0363335000)
libXcursor.so.1 => /usr/lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007f036312a000)
libXcomposite.so.1 => /usr/lib/x86_64-linux-gnu/libXcomposite.so.1 (0x00007f0362f27000)
libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007f0362d24000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f0362b1b000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f03628de000)
libraw1394.so.11 => /usr/lib/x86_64-linux-gnu/libraw1394.so.11 (0x00007f03626ce000)
libusb-1.0.so.0 => /lib/x86_64-linux-gnu/libusb-1.0.so.0 (0x00007f03624bf000)
libv4l2.so.0 => /usr/lib/x86_64-linux-gnu/libv4l2.so.0 (0x00007f03622b3000)
libvpx.so.1 => /usr/lib/libvpx.so.1 (0x00007f036200d000)
libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 (0x00007f0361b3e000)
libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 (0x00007f0361912000)
libtheoraenc.so.1 => /usr/lib/x86_64-linux-gnu/libtheoraenc.so.1 (0x00007f03616d4000)
libtheoradec.so.1 => /usr/lib/x86_64-linux-gnu/libtheoradec.so.1 (0x00007f03614b9000)
libspeex.so.1 => /usr/lib/x86_64-linux-gnu/libspeex.so.1 (0x00007f03612a0000)
libschroedinger-1.0.so.0 => /usr/lib/libschroedinger-1.0.so.0 (0x00007f0360fec000)
libgsm.so.1 => /usr/lib/libgsm.so.1 (0x00007f0360dde000)
libva.so.1 => /usr/lib/x86_64-linux-gnu/libva.so.1 (0x00007f0360bc8000)
libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0 (0x00007f03609b7000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f036071b000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f03604fc000)
libpixman-1.so.0 => /usr/lib/x86_64-linux-gnu/libpixman-1.so.0 (0x00007f0360275000)
libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f0360072000)
libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f035fe67000)
libgmodule-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007f035fc63000)
libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f035fa43000)
libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f035f827000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f035f5fc000)
libv4lconvert.so.0 => /usr/lib/x86_64-linux-gnu/libv4lconvert.so.0 (0x00007f035f387000)
libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 (0x00007f035f180000)
liborc-0.4.so.0 => /usr/lib/x86_64-linux-gnu/liborc-0.4.so.0 (0x00007f035ef04000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f035ed01000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f035eafb000)
See, the amount of linked libraries increased severalfold.
Step one is done. You can check the loading of opencv_example by running your VLC. But rightly then you may face another issue:
...
[0x7f2d741728f8] main video output debug: Adding 'opencv_example' as interactive
[0x7f2d747f7a68] main filter debug: looking for video filter2 module: 1 candidate
[0x7f2d747f7a68] main filter debug: using video filter2 module "opencv_example"
[0x7f2d747f7a68] main filter debug: TIMER module_need() : 149.351 ms - Total 149.351 ms / 1 intvls (Avg 149.351 ms)
[0x7f2d741728f8] main video output debug: Filter 'opencv_example' (0x7f2d747f7a68) appended to chain
[0x7f2d74173cb8] main spu text debug: removing module "freetype"
[0x7f2d74173cb8] main spu text debug: looking for text renderer module: 3 candidates
[0x7f2d74173cb8] freetype spu text debug: Building font databases.
[0x7f2d74173cb8] freetype spu text debug: Took 33 microseconds
[0x7f2d74173cb8] freetype spu text debug: Using Serif Bold as font from file /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf
[0x7f2d74173cb8] freetype spu text debug: using fontsize: 2
[0x7f2d74173cb8] main spu text debug: using text renderer module "freetype"
[0x7f2d74173cb8] main spu text debug: TIMER module_need() : 5.776 ms - Total 5.776 ms / 1 intvls (Avg 5.776 ms)
[0x7f2d8c00d018] main decoder debug: End of video preroll
[0x7f2d8c00d018] main decoder debug: Received first picture
Segmentation fault (core dumped)
2 Change the opencv_example source code
So, as I found out, the error is hidden in converting image from picture_t (VLC structure for storing image) to IplImage (OpenCV type for image):
//(hack) cast the picture_t to array of IplImage*
p_img = (IplImage**) p_pic->p[0].p_pixels;
Just change this convertion a little bit to make everything work well. Here is the full code for Filter method from my modified opencv_example.c:
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
IplImage* p_img;
int i_planes = 0;
CvPoint pt1, pt2;
int i, scale = 1;
filter_sys_t *p_sys = p_filter->p_sys;
if ((!p_pic))
{
msg_Err( p_filter, "no image array" );
return NULL;
}
i_planes = p_pic->i_planes;
if (i_planes<1)
{
msg_Err( p_filter, "no image planes" );
return NULL;
}
if ((p_pic->format.i_chroma != VLC_CODEC_I420))
{
msg_Err( p_filter, "wrong chroma - use I420" );
return NULL;
}
//picture_t to IplImage without segmentation fault
p_img = cvCreateImageHeader( cvSize( p_pic->p[0].i_pitch, p_pic->p[0].i_visible_lines ),
IPL_DEPTH_8U, 1 );
cvSetData( p_img, p_pic->p[0].p_pixels, p_pic->p[0].i_pitch );
//perform face detection
cvClearMemStorage(p_sys->p_storage);
if( p_sys->p_cascade )
{
//we should make some of these params config variables
CvSeq *faces = cvHaarDetectObjects( p_img, p_sys->p_cascade, p_sys->p_storage,
1.15, 5, CV_HAAR_DO_CANNY_PRUNING,
cvSize(0, 0), cvSize(20, 20) );
//create the video_filter_region_info_t struct
if (faces && (faces->total > 0))
{
msg_Dbg( p_filter, "Found %d face(s)", faces->total );
free( p_sys->event_info.p_region );
p_sys->event_info.p_region = (video_filter_region_info_t*)
calloc( faces->total, sizeof(video_filter_region_info_t));
if( !p_sys->event_info.p_region )
return NULL;
p_sys->event_info.i_region_size = faces->total;
}
//populate the video_filter_region_info_t struct
for( i = 0; i < (faces ? faces->total : 0); i++ )
{
CvRect *r = (CvRect*)cvGetSeqElem( faces, i );
pt1.x = r->x*scale;
pt2.x = (r->x+r->width)*scale;
pt1.y = r->y*scale;
pt2.y = (r->y+r->height)*scale;
cvRectangle( p_img, pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 );
*(CvRect*)(&(p_sys->event_info.p_region[i])) = *r;
p_sys->event_info.p_region[i].i_id = p_sys->i_id++;
p_sys->event_info.p_region[i].p_description = "Face Detected";
}
if (faces && (faces->total > 0)) //raise the video filter event
var_TriggerCallback( p_filter->p_libvlc, VIDEO_FILTER_EVENT_VARIABLE );
}
else
msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" );
//IplImage to picture_t without segmentation fault
cvGetRawData( p_img, (uchar**)&p_pic->p[0].p_pixels, NULL, NULL );
return p_pic;
}
VLC should work well, as well as opencv_example filter. Please, let me know if you'll have any other issues connected to the topic of VLC+OpenCV
#Anton good solution, what about timing i.e if the function in the filter need quite a time to finish > 500ms will that effect the framerate of the playbck !!
I am using mime_content_type() in PHP 5.5 to get a MIME type, but it throws fatal: error function not found.
How can I achieve this on PHP 5.5?
Make use of the finfo() functions.
A simple illustration:
<?php
$finfo = finfo_open(FILEINFO_MIME_TYPE);
echo finfo_file($finfo, "path/to/image_dir/image.gif");
finfo_close($finfo);
OUTPUT :
image/gif
Note : Windows users must include the bundled php_fileinfo.dll DLL file in php.ini to enable this extension.
I've spent too much time trying to get the finfo functions to work, properly. I finally just ended up creating my own function to match the file extension to any array of mime types. It's not a full-proof way of assuring that the files are truly what the extension denotes them to be, but that problem can be mitigated by how you process I/O of said files on your server(s).
function mime_type($file) {
// there's a bug that doesn't properly detect
// the mime type of css files
// https://bugs.php.net/bug.php?id=53035
// so the following is used, instead
// src: http://www.freeformatter.com/mime-types-list.html#mime-types-list
$mime_type = array(
"3dml" => "text/vnd.in3d.3dml",
"3g2" => "video/3gpp2",
"3gp" => "video/3gpp",
"7z" => "application/x-7z-compressed",
"aab" => "application/x-authorware-bin",
"aac" => "audio/x-aac",
"aam" => "application/x-authorware-map",
"aas" => "application/x-authorware-seg",
"abw" => "application/x-abiword",
"ac" => "application/pkix-attr-cert",
"acc" => "application/vnd.americandynamics.acc",
"ace" => "application/x-ace-compressed",
"acu" => "application/vnd.acucobol",
"adp" => "audio/adpcm",
"aep" => "application/vnd.audiograph",
"afp" => "application/vnd.ibm.modcap",
"ahead" => "application/vnd.ahead.space",
"ai" => "application/postscript",
"aif" => "audio/x-aiff",
"air" => "application/vnd.adobe.air-application-installer-package+zip",
"ait" => "application/vnd.dvb.ait",
"ami" => "application/vnd.amiga.ami",
"apk" => "application/vnd.android.package-archive",
"application" => "application/x-ms-application",
// etc...
// truncated due to Stack Overflow's character limit in posts
);
$extension = \strtolower(\pathinfo($file, \PATHINFO_EXTENSION));
if (isset($mime_type[$extension])) {
return $mime_type[$extension];
} else {
throw new \Exception("Unknown file type");
}
}
Edit:
I'd like to address Davuz's comment (since it keeps getting up-voted) and remind everyone that I put in the pseudo disclaimer at the top that this isn't "full-proof." So, please keep that in mind when considering the approach I've offered in my answer.
mime_content_type() is not deprecated and works fine.
Why is mime_content_type() deprecated in PHP?
http://php.net/manual/en/function.mime-content-type.php
As of PHP 5.3, it's even built-in.
$finfo = finfo_open(FILEINFO_MIME_TYPE); should do it.
Taken from the php.net docs. Your function is deprecated and probably already removed.
http://www.php.net/manual/en/function.finfo-file.php
You should understand that file_get_contents will upload whole file to the memory, it is not good way to get only mime type. You don't need to use buffer method and file_get_contents function in this case.
To prevent any errors and warnings, better do like this.
$filename = 'path to your file';
if (class_exists('finfo')) {
$finfo = new finfo(FILEINFO_MIME_TYPE);
if (is_object($finfo)) {
echo $finfo->file($filename);
}
} else {
echo 'fileinfo did not installed';
}
Also you should know $finfo->file will throw PHP Warning if it fail.
If fileinfo is not installed properly, and you have a fresh version of PHP, you can get mime type from headers.
You can use cURL to get mime type from headers.
$ch = curl_init();
curl_setopt_array($ch, array(
CURLOPT_HEADER => true,
CURLOPT_NOBODY => true,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_SSL_VERIFYHOST => false,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_MAXREDIRS => 1,
CURLOPT_URL => $link)
);
$headers = curl_exec($ch);
curl_close($ch);
if (preg_match('/Content-Type:\s(.*)/i', $headers, $matches)) {
echo trim($matches[1], "\t\n\r");
}else {
echo 'There is no content type in the headers!';
}
Also you can use get_headers function, but it more slow than cURL request.
$url = 'http://www.example.com';
$headers = get_headers($url, 1);
echo $headers['Content-Type'];
Get the image size using:
$infFil=getimagesize($the_file_name);
and
echo $infFil["mime"]
The getimagesize returns an associative array which have a MIME key and obviously the image size too
I used it and it works
I use the MimeTypeTool from Bat (https://github.com/lingtalfi/Bat)
It uses fileinfo if available, and defaults back to an "extension => mime type" mapping otherwise.
This is the best solution I found by combining two very good posts
// Thanks to http://php.net/manual/en/function.mime-content-type.php#87856
function getMimeContentType($filename, $ext)
{
if(!function_exists('mime_content_type'))
{
if($mime_types = getMimeTypes())
{
if (array_key_exists($ext, $mime_types))
{
return $mime_types[$ext];
}
elseif (function_exists('finfo_open'))
{
$finfo = finfo_open(FILEINFO_MIME);
$mimetype = finfo_file($finfo, $filename);
finfo_close($finfo);
return $mimetype;
}
}
return 'application/octet-stream';
}
return mime_content_type($filename);
}
// Thanks to http://php.net/manual/en/function.mime-content-type.php#107798
function getMimeTypes()
{
$url = 'http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types';
$mimes = array();
foreach(#explode("\n",#file_get_contents($url)) as $x)
{
if(isset($x[0]) && $x[0]!=='#' && preg_match_all('#([^\s]+)#', $x, $out) && isset($out[1]) && ($c = count($out[1])) > 1)
{
for($i=1; $i < $c; $i++)
{
$mimes[$out[1][$i]] = $out[1][0];
}
}
}
return (#sort($mimes)) ? $mimes : false;
}
Use it link this:
$filename = '/path/to/the/file.pdf';
$ext = strtolower(array_pop(explode('.',$filename)));
$content_type = getMimeContentType($filename, $ext);
Will continue to work even if the mime_content_type function is no longer supported in php.
I am using Observable.Merge to combine multiple sequences and display in a single view in UI. Users can choose to add or remove sequences(feeds) in the UI. While I have used Merge to combine feeds. I am not sure how I can detach an IObservable from a Merged sequence. Currently I am creating a brand new IObservable omitting the feeds I want to. Is it possible to dynamically add and remove to an IObsevable that the ViewModel has already subscribed to?
Take a look at using IObservable<IObservable<T>> and then use Merge. This automatically allows you to remove a sequence by ending the inner IObservable<T>. Simple.
Something like this would also work, but I suspect there are neater ways.
class Merger<T>
{
Subject<T> _merged = new Subject<T>();
public IObservable<T> Merged { get { return _merged; } }
public IDisposable Add(IObservable<T> newStream)
{
return newStream.Subscribe(_merged);
}
}
To remove something from the merged stream, dispose of the IDisposable.
This might help get you started, but on reconnection, because b is cold, b will restart from the beginning:
var a = Observable.Generate('A', x => x <= Char.MaxValue, x => ++x, x => x, x => TimeSpan.FromMilliseconds(200)).Select(x => "a: " + x).Publish();
var b = Observable.Generate('a', x => x <= Char.MaxValue, x => ++x, x => x, x => TimeSpan.FromMilliseconds(500)).Select(x => "b: " + x).Publish();
var merged = a.Merge(b).Publish();
var submerged = merged.Subscribe(x => x.Dump());
var subA = a.Connect();
var subB = b.Connect();
merged.Connect();
Task.Delay(2000).ContinueWith(t => subB.Dump("Disposing b.").Dispose());
Task.Delay(4000).ContinueWith(t => b.Connect()).ContinueWith(_ => "Reconnected to b");
EDIT:
To add another 'c' to the merged IO:
var a = Observable.Generate('A', x => x <= Char.MaxValue, x => ++x, x => x, x => TimeSpan.FromMilliseconds(200)).Select(x => "a: " + x).Publish();
var b = Observable.Generate('a', x => x <= Char.MaxValue, x => ++x, x => x, x => TimeSpan.FromMilliseconds(500)).Select(x => "b: " + x).Publish();
var c = Observable.Generate('1', x => x <= Char.MaxValue, x => ++x, x => x, x => TimeSpan.FromMilliseconds(100)).Select(x => "c: " + x).Publish();
var merged = a.Merge(b).Merge(c).Publish();
var submerged = merged.Subscribe(x => x.Dump());
var subA = a.Connect();
var subB = b.Connect();
merged.Connect();
Task.Delay(2000).ContinueWith(t => subB.Dump("Disposing b.").Dispose());
Task.Delay(4000).ContinueWith(t => b.Connect()).ContinueWith(_ => "Reconnected to b".Dump());
Task.Delay(6000).ContinueWith(t => c.Connect()).ContinueWith(_ => "Connecting to c".Dump());
I am working on a Perl script, but I am having an issue I can't really overcome. Here is my code:
my #rowses = ();
while ( #list = $sth->fetchrow_array())
{
%row = ();
if($list[30] == 1)
%row = (
cod_cliente => $list[1],
rag_soc => $list[2],
p_iva => $list[11],
IDanagrafica => $list[0],
tabella => $tab,
IDanagraficaE => $list[0],
tabellaE => $tab,
checkbox => "checked",
);
$LOL = \%row;
print $cgi->p($LOL);
}
else
{
%row = (
cod_cliente => $list[1],
rag_soc => $list[2],
p_iva => $list[11],
IDanagrafica => $list[0],
tabella => $tab,
IDanagraficaE => $list[0],
tabellaE => $tab,
checkbox => "",
);
$LOL = \%row;
print $cgi->p($LOL);
}
push (#rowses, \%row);
}
$template->param(table => \#rowses);
$template->param(tab => $tab);
When I try to print, for debugging, the reference to a row ($LOL), it prints nothing, and when I print the reference at #rowses, it is an array full of all the same hash, the last one the fetched by from the statement.
The weird is, if I print a hash row per time, without referencing it, it prints them well, and all of them.
I am doing that for passing the array reference, containing all the hashes, to a TMPL_LOOP, and print them; but it print a long list of only the last row fetched.
Thanks in advance to everyone who will help me.
Your %row is the same variable for each iteration of the while loop. You store just the reference to it in #rowses, which means if you change %row, all the references point to the changed hash. You should define a new %row for each iteration of the loop, e.g. by using
my %row;
indead of
%row = ();
Why $LOL is not printed: If the first argument to p is a hash reference, it is interpreted as the attributes of the <p>.