mpd/src/playlist/pls_playlist_plugin.c

/*
 * Copyright (C) 2003-2009 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 "playlist/pls_playlist_plugin.h"
#include "playlist_plugin.h"
#include "input_stream.h"
#include "uri.h"
#include "song.h"
#include "tag.h"
#include <glib.h>

struct pls_playlist {
	struct playlist_provider base;

	GSList *songs;
};

static void pls_parser(GKeyFile *keyfile, struct pls_playlist *playlist)
{
	gchar *key;
	gchar *value;
	int length;
	GError *error = NULL;
	int num_entries = g_key_file_get_integer(keyfile, "playlist",
						 "NumberOfEntries", &error);
	if (error) {
		g_debug("Invalid PLS file: '%s'", error->message);
		g_error_free(error);
		error = NULL;

		/* Hack to work around shoutcast failure to comform to spec */
		num_entries = g_key_file_get_integer(keyfile, "playlist",
						     "numberofentries", &error);
		if (error) {
			g_error_free(error);
			error = NULL;
		}
	}

	while (num_entries > 0) {
		struct song *song;
		key = g_strdup_printf("File%i", num_entries);
		value = g_key_file_get_string(keyfile, "playlist", key,
					      &error);
		if(error) {
			g_debug("Invalid PLS entry %s: '%s'",key, error->message);
			g_error_free(error);
			g_free(key);
			return;
		}
		g_free(key);

		song = song_remote_new(value);
		g_free(value);

		key = g_strdup_printf("Title%i", num_entries);
		value = g_key_file_get_string(keyfile, "playlist", key,
					      &error);
		g_free(key);
		if(error == NULL && value){
			if (song->tag == NULL)
				song->tag = tag_new();
			tag_add_item(song->tag,TAG_TITLE, value);
		}
		/* Ignore errors? Most likely value not present */
		if(error) g_error_free(error);
		error = NULL;
		g_free(value);

		key = g_strdup_printf("Length%i", num_entries);
		length = g_key_file_get_integer(keyfile, "playlist", key,
						&error);
		g_free(key);
		if(error == NULL && length > 0){
			if (song->tag == NULL)
				song->tag = tag_new();
			song->tag->time = length;
		}
		/* Ignore errors? Most likely value not present */
		if(error) g_error_free(error);
		error = NULL;

		playlist->songs = g_slist_prepend(playlist->songs, song);
		num_entries--;
	}

}

static struct playlist_provider *
pls_open_stream(struct input_stream *is)
{
	GError *error = NULL;
	size_t nbytes;
	char buffer[1024];
	bool success;
	GKeyFile *keyfile;
	struct pls_playlist *playlist;
	GString *kf_data = g_string_new("");

	do {
		nbytes = input_stream_read(is, buffer, sizeof(buffer));
		if(nbytes ==0)
			break;
		kf_data = g_string_append_len(kf_data, buffer,nbytes);
		/* Limit to 64k */
	} while(kf_data->len < 65536);

	if (kf_data->len == 0) {
		g_warning("KeyFile parser failed: No Data");
		g_string_free(kf_data, TRUE);
		return NULL;
	}

	keyfile = g_key_file_new();
	success = g_key_file_load_from_data(keyfile,
					    kf_data->str, kf_data->len,
					    G_KEY_FILE_NONE, &error);

	g_string_free(kf_data, TRUE);

	if (!success) {
		g_warning("KeyFile parser failed: %s", error->message);
		g_error_free(error);
		g_key_file_free(keyfile);
		return NULL;
	}

	playlist = g_new(struct pls_playlist, 1);
	playlist_provider_init(&playlist->base, &pls_playlist_plugin);
	playlist->songs = NULL;

	pls_parser(keyfile, playlist);

	g_key_file_free(keyfile);
	return &playlist->base;
}


static void
song_free_callback(gpointer data, G_GNUC_UNUSED gpointer user_data)
{
	struct song *song = data;

	song_free(song);
}

static void
pls_close(struct playlist_provider *_playlist)
{
	struct pls_playlist *playlist = (struct pls_playlist *)_playlist;

	g_slist_foreach(playlist->songs, song_free_callback, NULL);
	g_slist_free(playlist->songs);

	g_free(playlist);

}

static struct song *
pls_read(struct playlist_provider *_playlist)
{
	struct pls_playlist *playlist = (struct pls_playlist *)_playlist;
	struct song *song;

	if (playlist->songs == NULL)
		return NULL;

	song = playlist->songs->data;
	playlist->songs = g_slist_remove(playlist->songs, song);

	return song;
}

static const char *const pls_suffixes[] = {
	"pls",
	NULL
};

static const char *const pls_mime_types[] = {
	"audio/x-scpls",
	NULL
};

const struct playlist_plugin pls_playlist_plugin = {
	.name = "pls",

	.open_stream = pls_open_stream,
	.close = pls_close,
	.read = pls_read,

	.suffixes = pls_suffixes,
	.mime_types = pls_mime_types,
};