mpd/src/output_init.c

/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "output_control.h"
#include "output_api.h"
#include "output_internal.h"
#include "output_list.h"
#include "audio_parser.h"

#include <glib.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "output"

#define AUDIO_OUTPUT_TYPE	"type"
#define AUDIO_OUTPUT_NAME	"name"
#define AUDIO_OUTPUT_FORMAT	"format"

#define getBlockParam(name, str, force) { \
	bp = getBlockParam(param, name); \
	if(force && bp == NULL) { \
		g_error("couldn't find parameter \"%s\" in audio output " \
			"definition beginning at %i\n",			\
			name, param->line);				\
	} \
	if(bp) str = bp->value; \
}

bool
audio_output_init(struct audio_output *ao, const struct config_param *param)
{
	const char *name = NULL;
	char *format = NULL;
	struct block_param *bp = NULL;
	const struct audio_output_plugin *plugin = NULL;
	GError *error = NULL;

	if (param) {
		const char *type = NULL;

		getBlockParam(AUDIO_OUTPUT_NAME, name, 1);
		getBlockParam(AUDIO_OUTPUT_TYPE, type, 1);
		getBlockParam(AUDIO_OUTPUT_FORMAT, format, 0);

		plugin = audio_output_plugin_get(type);
		if (plugin == NULL) {
			g_error("couldn't find audio output plugin for type "
				"\"%s\" at line %i\n", type, param->line);
		}
	} else {
		unsigned i;

		g_warning("No \"%s\" defined in config file\n",
			  CONF_AUDIO_OUTPUT);
		g_warning("Attempt to detect audio output device\n");

		audio_output_plugins_for_each(plugin, i) {
			if (plugin->test_default_device) {
				g_warning("Attempting to detect a %s audio "
					  "device\n", plugin->name);
				if (ao_plugin_test_default_device(plugin)) {
					g_warning("Successfully detected a %s "
						  "audio device\n", plugin->name);
					break;
				}
			}
		}

		if (plugin == NULL) {
			g_warning("Unable to detect an audio device\n");
			return false;
		}

		name = "default detected output";
	}

	ao->name = name;
	ao->plugin = plugin;
	ao->enabled = config_get_block_bool(param, "enabled", true);
	ao->open = false;
	ao->fail_timer = NULL;

	pcm_convert_init(&ao->convert_state);

	if (format) {
		bool ret;

		ret = audio_format_parse(&ao->config_audio_format, format,
					 &error);
		if (!ret)
			g_error("error parsing format at line %i: %s",
				bp->line, error->message);
	} else
		audio_format_clear(&ao->config_audio_format);

	ao->thread = NULL;
	notify_init(&ao->notify);
	ao->command = AO_COMMAND_NONE;

	ao->data = ao_plugin_init(plugin,
				  format ? &ao->config_audio_format : NULL,
				  param, &error);
	if (ao->data == NULL) {
		g_warning("Failed to initialize \"%s\" [%s]: %s",
			  ao->name, ao->plugin->name,
			  error->message);
		g_error_free(error);
		return false;
	}

	return true;
}