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-rw-r--r--src/output/OutputInit.cxx329
1 files changed, 329 insertions, 0 deletions
diff --git a/src/output/OutputInit.cxx b/src/output/OutputInit.cxx
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+++ b/src/output/OutputInit.cxx
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+/*
+ * 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;
+}