{input,mixer}/alsa: move code to lib/alsa/NonBlock.cxx

src/lib/alsa/NonBlock.cxx

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "NonBlock.hxx"
+#include "event/MultiSocketMonitor.hxx"
+
+std::chrono::steady_clock::duration
+PrepareAlsaPcmSockets(MultiSocketMonitor &m, snd_pcm_t *pcm,
+		      ReusableArray<pollfd> &pfd_buffer)
+{
+	int count = snd_pcm_poll_descriptors_count(pcm);
+	if (count <= 0) {
+		m.ClearSocketList();
+		return std::chrono::steady_clock::duration(-1);
+	}
+
+	struct pollfd *pfds = pfd_buffer.Get(count);
+
+	count = snd_pcm_poll_descriptors(pcm, pfds, count);
+	if (count < 0)
+		count = 0;
+
+	m.ReplaceSocketList(pfds, count);
+	return std::chrono::steady_clock::duration(-1);
+}
+
+std::chrono::steady_clock::duration
+PrepareAlsaMixerSockets(MultiSocketMonitor &m, snd_mixer_t *mixer,
+			ReusableArray<pollfd> &pfd_buffer)
+{
+	int count = snd_mixer_poll_descriptors_count(mixer);
+	if (count <= 0) {
+		m.ClearSocketList();
+		return std::chrono::steady_clock::duration(-1);
+	}
+
+	struct pollfd *pfds = pfd_buffer.Get(count);
+
+	count = snd_mixer_poll_descriptors(mixer, pfds, count);
+	if (count < 0)
+		count = 0;
+
+	m.ReplaceSocketList(pfds, count);
+	return std::chrono::steady_clock::duration(-1);
+}