Add sndio output plugin

Makefile.am

@@ -1396,6 +1396,12 @@ liboutput_plugins_a_SOURCES += \
 	src/output/plugins/FifoOutputPlugin.hxx
 endif
 
+if HAVE_SNDIO
+liboutput_plugins_a_SOURCES += \
+	src/output/plugins/SndioOutputPlugin.cxx \
+	src/output/plugins/SndioOutputPlugin.hxx
+endif
+
 if HAVE_HAIKU
 liboutput_plugins_a_SOURCES += \
 	src/output/plugins/HaikuOutputPlugin.cxx \

NEWS

@@ -37,6 +37,7 @@ ver 0.20 (not yet released)
   - pulse: set channel map to WAVE-EX
   - recorder: record tags
   - recorder: allow dynamic file names
+  - sndio: new output plugin
 * mixer
   - null: new plugin
 * resampler

configure.ac

@@ -334,6 +334,11 @@ AC_ARG_ENABLE(fifo,
 		[disable support for writing audio to a FIFO (default: enable)]),,
 	enable_fifo=yes)
 
+AC_ARG_ENABLE(sndio,
+	AS_HELP_STRING([--enable-sndio],
+		[enable support for sndio output plugin (default: auto)]),,
+	enable_sndio=auto)
+
 AC_ARG_ENABLE(haiku,
 	AS_HELP_STRING([--enable-haiku],
 		[enable the Haiku output plugin (default: auto)]),,
@@ -1109,6 +1114,20 @@ fi
 MPD_DEFINE_CONDITIONAL(enable_fifo, HAVE_FIFO,
 	[support for writing audio to a FIFO])
 
+dnl ----------------------------------- SNDIO ----------------------------------
+if test x$enable_sndio = xauto; then
+	AC_CHECK_HEADER(sndio.h,
+		[enable_sndio=yes],
+		[enable_sndio=no;AC_MSG_WARN([sndio.h not found -- disabling support for sndio output])])
+fi
+
+if test x$enable_sndio = xyes; then
+	AC_DEFINE(HAVE_SNDIO,1,[Define for compiling sndio support])
+	LIBS="$LIBS -lsndio"
+fi
+
+AM_CONDITIONAL(HAVE_SNDIO, test x$enable_sndio = xyes)
+
 dnl ----------------------------------- Haiku ---------------------------------
 if test x$enable_haiku = xauto; then
 	AC_CHECK_HEADER(media/MediaDefs.h,
@@ -1429,6 +1448,7 @@ results(id3,[ID3])
 printf '\nPlayback support:\n\t'
 results(alsa,ALSA)
 results(fifo,FIFO)
+results(sndio,[SNDIO])
 results(recorder_output,[File Recorder])
 results(haiku,[Haiku])
 results(httpd_output,[HTTP Daemon])

src/output/Registry.cxx

@@ -23,6 +23,7 @@
 #include "plugins/AlsaOutputPlugin.hxx"
 #include "plugins/AoOutputPlugin.hxx"
 #include "plugins/FifoOutputPlugin.hxx"
+#include "plugins/SndioOutputPlugin.hxx"
 #include "plugins/httpd/HttpdOutputPlugin.hxx"
 #include "plugins/HaikuOutputPlugin.hxx"
 #include "plugins/JackOutputPlugin.hxx"
@@ -52,6 +53,9 @@ const AudioOutputPlugin *const audio_output_plugins[] = {
 #ifdef HAVE_FIFO
 	&fifo_output_plugin,
 #endif
+#ifdef HAVE_SNDIO
+	&sndio_output_plugin,
+#endif
 #ifdef HAVE_HAIKU
 	&haiku_output_plugin,
 #endif

src/output/plugins/SndioOutputPlugin.cxx

@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2016 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 <errno.h>
+#include <sndio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "SndioOutputPlugin.hxx"
+#include "config/ConfigError.hxx"
+#include "../OutputAPI.hxx"
+#include "../Wrapper.hxx"
+#include "../Timer.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+class SndioOutput {
+	friend struct AudioOutputWrapper<SndioOutput>;
+	AudioOutput base;
+	struct sio_hdl *sio_hdl;
+	Timer *timer;
+
+public:
+	SndioOutput()
+		:base(sndio_output_plugin),
+		 sio_hdl(nullptr) {}
+	~SndioOutput() {}
+
+	bool Configure(const ConfigBlock &block, Error &error);
+
+	static SndioOutput *Create(const ConfigBlock &block, Error &error);
+
+	bool Open(AudioFormat &audio_format, Error &error);
+	void Close();
+	unsigned Delay() const;
+	size_t Play(const void *chunk, size_t size, Error &error);
+	void Cancel();
+};
+
+static constexpr Domain sndio_output_domain("sndio_output");
+
+bool
+SndioOutput::Configure(const ConfigBlock &block, Error &error)
+{
+	if (!base.Configure(block, error))
+		return false;
+	return true;
+}
+
+SndioOutput *
+SndioOutput::Create(const ConfigBlock &block, Error &error)
+{
+	SndioOutput *ao = new SndioOutput();
+
+	if (!ao->Configure(block, error)) {
+		delete ao;
+		return nullptr;
+	}
+
+	return ao;
+}
+
+bool
+SndioOutput::Open(AudioFormat &audio_format, gcc_unused Error &error)
+{
+	struct sio_par par;
+	unsigned bits, rate, chans;
+
+	sio_hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0);
+	if (!sio_hdl) {
+		error.Format(sndio_output_domain, -1,
+		             "Failed to open default sndio device");
+		return false;
+	}
+
+	switch (audio_format.format) {
+	case SampleFormat::S16:
+		bits = 16;
+		break;
+	case SampleFormat::S32:
+		bits = 32;
+		break;
+	default:
+		audio_format.format = SampleFormat::S16;
+		bits = 16;
+		break;
+	}
+
+	rate = audio_format.sample_rate;
+	chans = audio_format.channels;
+
+	sio_initpar(&par);
+	par.bits = bits;
+	par.rate = rate;
+	par.pchan = chans;
+	par.sig = 1;
+	par.le = SIO_LE_NATIVE;
+
+	if (!sio_setpar(sio_hdl, &par) ||
+	    !sio_getpar(sio_hdl, &par)) {
+		error.Format(sndio_output_domain, -1,
+		             "Failed to set/get audio params");
+		goto err;
+	}
+
+	if (par.bits != bits ||
+	    par.rate < rate * 995 / 1000 ||
+	    par.rate > rate * 1005 / 1000 ||
+	    par.pchan != chans ||
+	    par.sig != 1 ||
+	    par.le != SIO_LE_NATIVE) {
+		error.Format(sndio_output_domain, -1,
+		             "Requested audio params cannot be satisfied");
+		goto err;
+	}
+
+	if (!sio_start(sio_hdl)) {
+		error.Format(sndio_output_domain, -1,
+		             "Failed to start audio device");
+		goto err;
+	}
+
+	timer = new Timer(audio_format);
+	return true;
+err:
+	sio_close(sio_hdl);
+	sio_hdl = nullptr;
+	return false;
+}
+
+void
+SndioOutput::Close()
+{
+	if (sio_hdl)
+		sio_close(sio_hdl);
+	delete timer;
+}
+
+unsigned
+SndioOutput::Delay() const
+{
+	return timer->IsStarted()
+		? timer->GetDelay()
+		: 0;
+}
+
+size_t
+SndioOutput::Play(const void *chunk, size_t size, Error &error)
+{
+	ssize_t n;
+
+	if (!timer->IsStarted())
+		timer->Start();
+	timer->Add(size);
+
+	while (1) {
+		n = sio_write(sio_hdl, chunk, size);
+		if (n < 0) {
+			if (errno == EINTR)
+				continue;
+			error.FormatErrno("Failed to write %zu bytes to sndio output", size);
+			return 0;
+		}
+		return n;
+	}
+}
+
+void
+SndioOutput::Cancel()
+{
+	timer->Reset();
+}
+
+typedef AudioOutputWrapper<SndioOutput> Wrapper;
+
+const struct AudioOutputPlugin sndio_output_plugin = {
+	"sndio",
+	nullptr,
+	&Wrapper::Init,
+	&Wrapper::Finish,
+	nullptr,
+	nullptr,
+	&Wrapper::Open,
+	&Wrapper::Close,
+	&Wrapper::Delay,
+	nullptr,
+	&Wrapper::Play,
+	nullptr,
+	&Wrapper::Cancel,
+	nullptr,
+	nullptr,
+};

src/output/plugins/SndioOutputPlugin.hxx

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef MPD_SNDIO_OUTPUT_PLUGIN_HXX
+#define MPD_SNDIO_OUTPUT_PLUGIN_HXX
+
+extern const struct AudioOutputPlugin sndio_output_plugin;
+
+#endif