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v4l2 capture example · GitHub
https://gist.github.com/maxlapshin/1253534
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)) {switch (errno) {case EINVAL: /* Cropping not supported. */ break; default: /* Errors ignored. */ break;}}} else {/* Errors ignored. */}
v4l2 capture example - GitHub
https://gist.github.com/shabaka101694/fef605be7012999e7c7b7d2b5c01b9fa
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)) {switch (errno) {case EINVAL: /* Cropping not supported. */ break; default: /* Errors ignored. */ break;}}} else {/* Errors ignored. */}
linux - Can v4l2 be used to read audio and video from the ...
https://stackoverflow.com/questions/917060/can-v4l2-be-used-to-read-audio-and-video-from-the-same-device
Show activity on this post. There are some spare or reserved fields in the v4l2 buffers that can be used to pass audio or other data from the driver to the calling application via pointers to mmaped buffers. I modified the BT8x8 driver to use this approach to pass data from an A/D card synchronized to the video on Ubuntu 6.06.
c++ - Sound capture hang/freeze during v4l2 …
https://stackoverflow.com/questions/63560348/sound-capture-hang-freeze-during-v4l2-vidioc-qbuf-calls
I'm trying to capture sound with ALSA asound + video via v4l2 on raspberry pi, and separately it works fine. But on same time some audio frames loosing during VIDIOC_QBUF ioctl call: ioctl(fd, VIDIOC_QBUF, &bufferinfo[i]) and capturing audio with. snd_pcm_readi (capture_handle, input_buffer_audio, audio_frames)
v4l-utils/capture-example.c at master · gjasny ... - GitHub
https://github.com/gjasny/v4l-utils/blob/master/contrib/test/capture-example.c
enum v4l2_buf_type type; switch (io) {case IO_METHOD_READ: /* Nothing to do. */ break; case IO_METHOD_MMAP: case IO_METHOD_USERPTR: type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type)) errno_exit (" VIDIOC_STREAMOFF "); break;}} static void start_capturing (void) {unsigned int i; enum v4l2_buf_type type; switch (io) {case …
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