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output/alsa: check PCM state before calling snd_pcm_drain()

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Apparently, if snd_pcm_drain() returns EAGAIN, it does not actually
want to be called again; the next call will snd_pcm_drain() will also
return EAGAIN, forever, even though the PCM state has meanwhile
switched to SND_PCM_STATE_SETUP.  This causes a busy loop; to fix
this, we should always check snd_pcm_state() to see if draining is
really required.
This commit is contained in:
Max Kellermann
2019-06-28 08:55:23 +02:00
parent 8bf3f9b874
commit 543776d9c9
2 changed files with 19 additions and 0 deletions
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@@ -4,6 +4,7 @@ ver 0.21.11 (not yet released)
* decoder
- wildmidi: log error if library initialization fails
* output
- alsa: fix busy loop while draining
- alsa, osx: fix distortions with DSD_U32 and DoP on 32 bit CPUs
* protocol
- fix "list" with multiple "group" levels