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Currently the snd_clone framework creates device nodes on-demand for every channel, through the dsp_clone() callback, and is responsible for routing audio to the appropriate channel(s). This patch gets rid of the whole snd_clone framework (including any related sysctls) and instead uses DEVFS_CDEVPRIV(9) to handle device opening, channel allocation and audio routing. This results in a significant reduction in code size as well as complexity. Behavior that is preserved: - hw.snd.basename_clone. - Exclusive access of an audio device (i.e VCHANs disabled). - Multiple processes can read from/write to the device. - A device can only be opened as many times as the maximum allowed channel number (see SND_MAXHWCHAN in pcm/sound.h). - OSSv4 compatibility aliases are preserved. Behavior changes: Only one /dev/dspX device node is created (on attach) for each audio device, as opposed to the current /dev/dspX.Y devices created by snd_clone. According to the sound(4) man page, devices are not meant to be opened through /dev/dspX.Y anyway, so it is best if we do not create device nodes for them in the first place. As a result of this, modify dsp_oss_audioinfo() to print /dev/dspX in the "ai->devnode", instead of /dev/dspX.Y. Sponsored by: The FreeBSD Foundation MFC after: 2 months Reviewed by: dev_submerge.ch, bapt, markj Differential Revision: https://reviews.freebsd.org/D44411 (cherry picked from commit e8c0d15a64fadb4a330f2da7244becaac161bb70) |
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