snd_pcm_recover() puts the device back in SND_PCM_STATE_PREPARED state; you
have to explicitly restart the device afterwards with snd_pcm_start().
Fixes#13761.
Building SDL for armeabi-v7a gives this warning:
```
SDL/src/audio/SDL_audiotypecvt.c:541:14: warning: '#pragma FENV_ACCESS' is not supported on this target - ignored [-Wignored-pragmas]
541 | #pragma STDC FENV_ACCESS ON
```
This reverts commit 608f706a95.
Didn't end up using this in SDL3_mixer, and it's a super-awkward API if we
don't need it.
I _might_ bite the bullet and let people lock a physical audio device, though,
as I could see that being useful but less awkward for the same reasons I
originally wanted it.
This still logs backend choices, but we might use it for other things. For
example, what Android device is being used, or all the devices we enumerated,
etc.
Ideally this eventually logs all the stuff we often have to ask followup
questions about.
It _must_ have the format set for the opposite side from the device (so
playback needs the src format set, and recording needs the dst format set),
since the stream gets mangled by the device thread if not. So if it has never
been set (stream created with NULL audiospec), just set it to match the device.
If the stream is just meant to buffer and not convert, this is desired
behavior, even if it didn't also fix a bug.
Binding the audio stream will always set the device side's format, as usual;
this does not need to be set by the caller at all.
Fixes#13363.
This is a special-case piece of functionality, generally these are expected
to go away during shutdown, but maybe someone is switching between audio
subsystems or something...
- Check for specific availability instead of waiting for "device ready."
- Don't use snd_pcm_wait, just use a simple SDL_Delay (nothing to recover).
- Fixed SDL_max call that should have been SDL_min (now using SDL_clamp).
- ALSA_RecordDevice() now returns 0 if no availability, which kicks us back
to WaitDevice to try again, as an extra safety check.
The keys and values of device_hash are pairs
`(SDL_AudioDeviceID devid, void *dev)` where dev can be either a
`SDL_AudioDevice *` or a `SDL_LogicalAudioDevice *`, depending on
bit 1 of devid.
We can confirm that we have got this right by looking at the
instance_id member, because logical audio devices happen to start with
the devid, whereas physical devices start with a pointer which is
unlikely to match the devid by chance.
Signed-off-by: Simon McVittie <smcv@collabora.com>
