output/alsa: hold back snd_pcm_writei() until period_buffer is full

This gives MPD more control, because attempts to avoid having partial periods in the ALSA period buffer. For example, this means that DrainInternal() doesn't need to generate silence to fill the partial period.

output/alsa: hold back snd_pcm_writei() until period_buffer is full
9fc1668d · Max Kellermann · e9190f42 · 9fc1668d
Commit 9fc1668d authored Jun 27, 2019 by Max Kellermann
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AlsaOutputPlugin.cxx src/output/plugins/AlsaOutputPlugin.cxx +1 -1

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--- a/src/output/plugins/AlsaOutputPlugin.cxx
+++ b/src/output/plugins/AlsaOutputPlugin.cxx
@@ -956,7 +956,7 @@ try {

 	CopyRingToPeriodBuffer();

-	if (period_buffer.IsEmpty()) {
+	if (!period_buffer.IsFull()) {
 		if (snd_pcm_state(pcm) == SND_PCM_STATE_PREPARED ||
 		    snd_pcm_avail(pcm) <= max_avail_frames) {
 			/* at SND_PCM_STATE_PREPARED (not yet switched