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c - how to use the ioctl() function with audio CD drives ...
https://stackoverflow.com/questions/53308161/how-to-use-the-ioctl-function-with-audio-cd-drives
CDROMREADAUDIO (struct cdrom_read_audio) usage: struct cdrom_read_audio ra; ioctl(fd, CDROMREADAUDIO, &ra); inputs: cdrom_read_audio structure containing read start point and length outputs: audio data, returned to buffer indicated by ra error return: EINVAL format not CDROM_MSF or CDROM_LBA EINVAL nframes not in range [1 75] ENXIO drive has no queue …
7.22. ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO — The …
https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/vidioc-g-audio.html
Audio inputs have one writable property, the audio mode. To select the current audio input and change the audio mode, applications initialize the index and mode fields, and the reserved array of a struct v4l2_audio structure and call the VIDIOC_S_AUDIO ioctl. Drivers may switch to a different audio mode if the request cannot be satisfied.
The ioctl Method - Linux Device Drivers, Second Edition …
https://www.oreilly.com/library/view/linux-device-drivers/0596000081/ch12s06.html
The 2.4 kernel has provided a function, blk_ioctl, that may be called to implement the common commands; it is declared in <linux/blkpg.h>. Often the only ones that must be implemented in the driver itself are BLKGETSIZE and HDIO_GETGEO. The driver can then safely pass any other commands to blk_ioctl for handling.
Summary of CDROM ioctl calls — The Linux Kernel …
https://www.kernel.org/doc/html/latest/userspace-api/ioctl/cdrom.html
Ok, this is where problems start. The current interface for the CDROM_DISC_STATUS ioctl is flawed. It makes the false assumption that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc. Unfortunately, while this is often the case, it is also very common for CDs to have some tracks with data, and some tracks with audio.
Linux Audio Driver III: Call Flow of pcm Interface
https://programmer.group/linux-audio-driver-iii-call-flow-of-pcm-interface.html
I. open of pcm equipment. According to the article "One of Linux Audio Drivers: Audio Driver Registration Process", pcm device calls the snd_pcm_dev_register function registration. snd_pcm_dev_register err = snd_register_device_for_dev (devtype, pcm->card,pcm->device, &snd_pcm_f_ops [cidx],pcm, str, dev); When registering and playing PCM devices, f …
ioctl(2) - Linux manual page - Michael Kerrisk
https://man7.org/linux/man-pages/man2/ioctl.2.html
An ioctl() request has encoded in it whether the argument is an in parameter or out parameter, and the size of the argument argp in bytes. Macros and defines used in specifying an ioctl() request are located in the file <sys/ioctl.h>. See NOTES. RETURN VALUE top Usually, on success zero is returned.
ioctl(3p) - Linux manual page - Michael Kerrisk
https://www.man7.org/linux/man-pages/man3/ioctl.3p.html
IOCTL(3P) POSIX Programmer's Manual IOCTL(3P) PROLOG top This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
ioctl_list - Linux
https://nixdoc.net/man-pages/Linux/man2/ioctl_list.2.html
It contains 421 ioctls from /usr/include/ {asm,linux}/*.h. For each ioctl, I list its numerical value, its name, and its argument type. An argument type of 'const struct foo *' means the argument is input to the kernel. 'struct foo *' means the kernel outputs the argument. If the kernel uses the argument for both input and output, this is marked with // I-O.
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