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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#:~:text=Most%20of%20the%20cheap%20v4l2%20capture%20card%27s%20audio,sound%20card%27s%20line%20input.%20Share%20Improve%20this%20answer
Documentation:Modules/v4l2 - VideoLAN Wiki
https://wiki.videolan.org/Documentation:Modules/v4l2/
v4l2-audio-method <integer> : Allowed audio input methods (bitmask: 1 for OSS, 2 for ALSA) default value: 3; v4l2-stereo : Capture audio in stereo default value: enabled; v4l2-samplerate <integer> : Audio input sample rate in Hz default value: 48000; Tuner. v4l2-tuner <integer> : Tuner to use default value: 0; v4l2-tuner-frequency <integer> : Tuner frequency in Hz or MHz …
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
IF you want your driver to play with gstreamer etc. a separate audio device generally is what is expected. Most of the cheap v4l2 capture card's audio is only an analog pass through with a volume control requiring a jumper to capture the audio via the sound card's line input. Share. Improve this answer.
7.1. Differences between V4L and V4L2 — The Linux …
https://www.kernel.org/doc/html/v4.9/media/uapi/v4l/diff-v4l.html
Accordingly the VIDEO_AUDIO_MUTABLE and VIDEO_AUDIO_MUTE flags where replaced by the boolean V4L2_CID_AUDIO_MUTE control. All V4L2 controls have a step attribute replacing the struct video_audio step field. The V4L audio controls are assumed to range from 0 to 65535 with no particular reset value. The V4L2 API permits arbitrary limits and defaults which can be …
1.12. V4L2 Controls — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.10/media/kapi/v4l2-controls.html
static int foo_s_ctrl(struct v4l2_ctrl *ctrl) { struct foo *state = container_of(ctrl->handler, struct foo, ctrl_handler); switch (ctrl->id) { case V4L2_CID_AUDIO_VOLUME: { struct v4l2_ctrl *mute = ctrl->cluster[AUDIO_CL_MUTE]; write_reg(0x123, mute->val ? 0 : ctrl->val); break; } case V4L2_CID_CONTRAST: write_reg(0x456, ctrl->val); break; } return 0; }
An Introduction to the Video4Linux Framework
https://elinux.org/images/8/89/V4l2-frameworks_0.pdf
strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card)); snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s", pci_name(skel->pdev)); cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | …
v4l2 capture example · GitHub
https://gist.github.com/maxlapshin/1253534
case IO_METHOD_USERPTR: CLEAR(buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_USERPTR; if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {switch …
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