1 files changed, 329 insertions, 0 deletions
diff --git a/src/output/OutputInit.cxx b/src/output/OutputInit.cxx
new file mode 100644
index 000000000..f5b1bdc81
--- /dev/null
+++ b/src/output/OutputInit.cxx
@@ -0,0 +1,329 @@
+/*
+ * Copyright (C) 2003-2014 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 "OutputInternal.hxx"
+#include "OutputList.hxx"
+#include "OutputError.hxx"
+#include "OutputAPI.hxx"
+#include "FilterConfig.hxx"
+#include "AudioParser.hxx"
+#include "MixerList.hxx"
+#include "MixerType.hxx"
+#include "MixerControl.hxx"
+#include "mixer/SoftwareMixerPlugin.hxx"
+#include "FilterPlugin.hxx"
+#include "FilterRegistry.hxx"
+#include "filter/AutoConvertFilterPlugin.hxx"
+#include "filter/ReplayGainFilterPlugin.hxx"
+#include "filter/ChainFilterPlugin.hxx"
+#include "ConfigError.hxx"
+#include "ConfigGlobal.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+
+#include <assert.h>
+#include <string.h>
+
+#define AUDIO_OUTPUT_TYPE	"type"
+#define AUDIO_OUTPUT_NAME	"name"
+#define AUDIO_OUTPUT_FORMAT	"format"
+#define AUDIO_FILTERS		"filters"
+
+static const struct audio_output_plugin *
+audio_output_detect(Error &error)
+{
+	LogDefault(output_domain, "Attempt to detect audio output device");
+
+	audio_output_plugins_for_each(plugin) {
+		if (plugin->test_default_device == nullptr)
+			continue;
+
+		FormatDefault(output_domain,
+			      "Attempting to detect a %s audio device",
+			      plugin->name);
+		if (ao_plugin_test_default_device(plugin))
+			return plugin;
+	}
+
+	error.Set(output_domain, "Unable to detect an audio device");
+	return nullptr;
+}
+
+/**
+ * Determines the mixer type which should be used for the specified
+ * configuration block.
+ *
+ * This handles the deprecated options mixer_type (global) and
+ * mixer_enabled, if the mixer_type setting is not configured.
+ */
+gcc_pure
+static enum mixer_type
+audio_output_mixer_type(const config_param &param)
+{
+	/* read the local "mixer_type" setting */
+	const char *p = param.GetBlockValue("mixer_type");
+	if (p != nullptr)
+		return mixer_type_parse(p);
+
+	/* try the local "mixer_enabled" setting next (deprecated) */
+	if (!param.GetBlockValue("mixer_enabled", true))
+		return MIXER_TYPE_NONE;
+
+	/* fall back to the global "mixer_type" setting (also
+	   deprecated) */
+	return mixer_type_parse(config_get_string(CONF_MIXER_TYPE,
+						  "hardware"));
+}
+
+static Mixer *
+audio_output_load_mixer(struct audio_output *ao,
+			const config_param &param,
+			const struct mixer_plugin *plugin,
+			Filter &filter_chain,
+			Error &error)
+{
+	Mixer *mixer;
+
+	switch (audio_output_mixer_type(param)) {
+	case MIXER_TYPE_NONE:
+	case MIXER_TYPE_UNKNOWN:
+		return nullptr;
+
+	case MIXER_TYPE_HARDWARE:
+		if (plugin == nullptr)
+			return nullptr;
+
+		return mixer_new(plugin, ao, param, error);
+
+	case MIXER_TYPE_SOFTWARE:
+		mixer = mixer_new(&software_mixer_plugin, nullptr,
+				  config_param(),
+				  IgnoreError());
+		assert(mixer != nullptr);
+
+		filter_chain_append(filter_chain, "software_mixer",
+				    software_mixer_get_filter(mixer));
+		return mixer;
+	}
+
+	assert(false);
+	gcc_unreachable();
+}
+
+bool
+ao_base_init(struct audio_output *ao,
+	     const struct audio_output_plugin *plugin,
+	     const config_param &param, Error &error)
+{
+	assert(ao != nullptr);
+	assert(plugin != nullptr);
+	assert(plugin->finish != nullptr);
+	assert(plugin->open != nullptr);
+	assert(plugin->close != nullptr);
+	assert(plugin->play != nullptr);
+
+	if (!param.IsNull()) {
+		ao->name = param.GetBlockValue(AUDIO_OUTPUT_NAME);
+		if (ao->name == nullptr) {
+			error.Set(config_domain,
+				  "Missing \"name\" configuration");
+			return false;
+		}
+
+		const char *p = param.GetBlockValue(AUDIO_OUTPUT_FORMAT);
+		if (p != nullptr) {
+			bool success =
+				audio_format_parse(ao->config_audio_format,
+						   p, true, error);
+			if (!success)
+				return false;
+		} else
+			ao->config_audio_format.Clear();
+	} else {
+		ao->name = "default detected output";
+
+		ao->config_audio_format.Clear();
+	}
+
+	ao->plugin = plugin;
+	ao->tags = param.GetBlockValue("tags", true);
+	ao->always_on = param.GetBlockValue("always_on", false);
+	ao->enabled = param.GetBlockValue("enabled", true);
+	ao->really_enabled = false;
+	ao->open = false;
+	ao->pause = false;
+	ao->allow_play = true;
+	ao->in_playback_loop = false;
+	ao->woken_for_play = false;
+
+	/* set up the filter chain */
+
+	ao->filter = filter_chain_new();
+	assert(ao->filter != nullptr);
+
+	/* create the normalization filter (if configured) */
+
+	if (config_get_bool(CONF_VOLUME_NORMALIZATION, false)) {
+		Filter *normalize_filter =
+			filter_new(&normalize_filter_plugin, config_param(),
+				   IgnoreError());
+		assert(normalize_filter != nullptr);
+
+		filter_chain_append(*ao->filter, "normalize",
+				    autoconvert_filter_new(normalize_filter));
+	}
+
+	Error filter_error;
+	filter_chain_parse(*ao->filter,
+			   param.GetBlockValue(AUDIO_FILTERS, ""),
+			   filter_error);
+
+	// It's not really fatal - Part of the filter chain has been set up already
+	// and even an empty one will work (if only with unexpected behaviour)
+	if (filter_error.IsDefined())
+		FormatError(filter_error,
+			    "Failed to initialize filter chain for '%s'",
+			    ao->name);
+
+	ao->command = AO_COMMAND_NONE;
+
+	ao->mixer = nullptr;
+	ao->replay_gain_filter = nullptr;
+	ao->other_replay_gain_filter = nullptr;
+
+	/* done */
+
+	return true;
+}
+
+static bool
+audio_output_setup(struct audio_output *ao, const config_param &param,
+		   Error &error)
+{
+
+	/* create the replay_gain filter */
+
+	const char *replay_gain_handler =
+		param.GetBlockValue("replay_gain_handler", "software");
+
+	if (strcmp(replay_gain_handler, "none") != 0) {
+		ao->replay_gain_filter = filter_new(&replay_gain_filter_plugin,
+						    param, IgnoreError());
+		assert(ao->replay_gain_filter != nullptr);
+
+		ao->replay_gain_serial = 0;
+
+		ao->other_replay_gain_filter = filter_new(&replay_gain_filter_plugin,
+							  param,
+							  IgnoreError());
+		assert(ao->other_replay_gain_filter != nullptr);
+
+		ao->other_replay_gain_serial = 0;
+	} else {
+		ao->replay_gain_filter = nullptr;
+		ao->other_replay_gain_filter = nullptr;
+	}
+
+	/* set up the mixer */
+
+	Error mixer_error;
+	ao->mixer = audio_output_load_mixer(ao, param,
+					    ao->plugin->mixer_plugin,
+					    *ao->filter, mixer_error);
+	if (ao->mixer == nullptr && mixer_error.IsDefined())
+		FormatError(mixer_error,
+			    "Failed to initialize hardware mixer for '%s'",
+			    ao->name);
+
+	/* use the hardware mixer for replay gain? */
+
+	if (strcmp(replay_gain_handler, "mixer") == 0) {
+		if (ao->mixer != nullptr)
+			replay_gain_filter_set_mixer(ao->replay_gain_filter,
+						     ao->mixer, 100);
+		else
+			FormatError(output_domain,
+				    "No such mixer for output '%s'", ao->name);
+	} else if (strcmp(replay_gain_handler, "software") != 0 &&
+		   ao->replay_gain_filter != nullptr) {
+		error.Set(config_domain,
+			  "Invalid \"replay_gain_handler\" value");
+		return false;
+	}
+
+	/* the "convert" filter must be the last one in the chain */
+
+	ao->convert_filter = filter_new(&convert_filter_plugin, config_param(),
+					IgnoreError());
+	assert(ao->convert_filter != nullptr);
+
+	filter_chain_append(*ao->filter, "convert", ao->convert_filter);
+
+	return true;
+}
+
+struct audio_output *
+audio_output_new(const config_param &param,
+		 PlayerControl &pc,
+		 Error &error)
+{
+	const struct audio_output_plugin *plugin;
+
+	if (!param.IsNull()) {
+		const char *p;
+
+		p = param.GetBlockValue(AUDIO_OUTPUT_TYPE);
+		if (p == nullptr) {
+			error.Set(config_domain,
+				  "Missing \"type\" configuration");
+			return nullptr;
+		}
+
+		plugin = audio_output_plugin_get(p);
+		if (plugin == nullptr) {
+			error.Format(config_domain,
+				     "No such audio output plugin: %s", p);
+			return nullptr;
+		}
+	} else {
+		LogWarning(output_domain,
+			   "No 'audio_output' defined in config file");
+
+		plugin = audio_output_detect(error);
+		if (plugin == nullptr)
+			return nullptr;
+
+		FormatDefault(output_domain,
+			      "Successfully detected a %s audio device",
+			      plugin->name);
+	}
+
+	struct audio_output *ao = ao_plugin_init(plugin, param, error);
+	if (ao == nullptr)
+		return nullptr;
+
+	if (!audio_output_setup(ao, param, error)) {
+		ao_plugin_finish(ao);
+		return nullptr;
+	}
+
+	ao->player_control = &pc;
+	return ao;
+}