mpd version 0.15.11

libavformat 0.6 does not pass the original URI pointer to the "open"
method, which leads to a crash because MPD was using a dirty hack to
pass a pointer to that method.

This patch switches to av_open_input_stream() with a custom
ByteIOContext class, instead of doing the URI string hack with
av_open_input_file().

Loosely based on a patch from Jasper St. Pierre.

Makefile.am

@@ -142,6 +142,7 @@ mpd_headers = \
 	src/tag.h \
 	src/tag_internal.h \
 	src/tag_pool.h \
+	src/tag_table.h \
 	src/tag_ape.h \
 	src/tag_id3.h \
 	src/tag_print.h \

NEWS

@@ -1,3 +1,26 @@
+ver 0.15.11 (2010/06/14)
+* tags:
+  - ape: support album artist
+* decoders:
+  - mp4ff: support tags "album artist", "albumartist", "band"
+  - mikmod: fix memory leak
+  - vorbis: handle uri==NULL
+  - ffmpeg: fix memory leak
+  - ffmpeg: free AVFormatContext on error
+  - ffmpeg: read more metadata
+  - ffmpeg: fix libavformat 0.6 by using av_open_input_stream()
+* playlist: emit IDLE_OPTIONS when resetting single mode
+* listen: make get_remote_uid() work on BSD
+
+
+ver 0.15.10 (2010/05/30)
+* input:
+  - mms: fix memory leak in error handler
+  - mms: initialize the "eof" attribute
+* decoders:
+  - mad: properly calculate ID3 size without libid3tag
+
+
 ver 0.15.9 (2010/03/21)
 * decoders:
   - mad: fix crash when seeking at end of song

configure.ac

@@ -1,5 +1,5 @@
 AC_PREREQ(2.60)
-AC_INIT(mpd, 0.15.9, musicpd-dev-team@lists.sourceforge.net)
+AC_INIT(mpd, 0.15.11, musicpd-dev-team@lists.sourceforge.net)
 AC_CONFIG_SRCDIR([src/main.c])
 AM_INIT_AUTOMAKE([foreign 1.9 dist-bzip2])
 AM_CONFIG_HEADER(config.h)
@@ -177,6 +177,7 @@ AC_ARG_ENABLE(un,
 if test x$enable_un = xyes; then
 	AC_DEFINE(HAVE_UN, 1, [Define if unix domain socket support is enabled])
 	STRUCT_UCRED
+	AC_CHECK_FUNCS(getpeereid)
 fi
 
 
@@ -913,17 +914,9 @@ fi
 
 AM_CONDITIONAL(HAVE_AUDIOFILE, test x$enable_audiofile = xyes)
 
-MPD_AUTO_PKG(ffmpeg, FFMPEG, [libavformat libavcodec libavutil],
+MPD_AUTO_PKG(ffmpeg, FFMPEG, [libavformat >= 52 libavcodec >= 51 libavutil >= 49],
 	[ffmpeg decoder library], [libavformat+libavcodec+libavutil not found])
 
-if test x$enable_ffmpeg = xyes; then
-	old_LIBS=$LIBS
-	LIBS="$LIBS $FFMPEG_LIBS"
-	AC_CHECK_LIB(avcodec, avcodec_decode_audio2,,
-		enable_ffmpeg=no)
-	LIBS=$old_LIBS
-fi
-
 if test x$enable_ffmpeg = xyes; then
 	# prior to ffmpeg svn12865, you had to specify include files
 	# without path prefix

src/decoder/ffmpeg_plugin.c

@@ -53,48 +53,27 @@ struct ffmpeg_context {
 	struct tag *tag;
 };
 
-struct ffmpeg_stream {
-	/** hack - see url_to_struct() */
-	char url[64];
-
+struct mpd_ffmpeg_stream {
 	struct decoder *decoder;
 	struct input_stream *input;
+
+	ByteIOContext *io;
+	unsigned char buffer[8192];
 };
 
-/**
- * Convert a faked mpd:// URL to a ffmpeg_stream structure.  This is a
- * hack because ffmpeg does not provide a nice API for passing a
- * user-defined pointer to mpdurl_open().
- */
-static struct ffmpeg_stream *url_to_struct(const char *url)
+static int
+mpd_ffmpeg_stream_read(void *opaque, uint8_t *buf, int size)
 {
-	union {
-		const char *in;
-		struct ffmpeg_stream *out;
-	} u = { .in = url };
-	return u.out;
-}
-
-static int mpd_ffmpeg_open(URLContext *h, const char *filename,
-			   G_GNUC_UNUSED int flags)
-{
-	struct ffmpeg_stream *stream = url_to_struct(filename);
-	h->priv_data = stream;
-	h->is_streamed = stream->input->seekable ? 0 : 1;
-	return 0;
-}
-
-static int mpd_ffmpeg_read(URLContext *h, unsigned char *buf, int size)
-{
-	struct ffmpeg_stream *stream = (struct ffmpeg_stream *) h->priv_data;
+	struct mpd_ffmpeg_stream *stream = opaque;
 
 	return decoder_read(stream->decoder, stream->input,
 			    (void *)buf, size);
 }
 
-static int64_t mpd_ffmpeg_seek(URLContext *h, int64_t pos, int whence)
+static int64_t
+mpd_ffmpeg_stream_seek(void *opaque, int64_t pos, int whence)
 {
-	struct ffmpeg_stream *stream = (struct ffmpeg_stream *) h->priv_data;
+	struct mpd_ffmpeg_stream *stream = opaque;
 	bool ret;
 
 	if (whence == AVSEEK_SIZE)
@@ -107,25 +86,36 @@ static int64_t mpd_ffmpeg_seek(URLContext *h, int64_t pos, int whence)
 	return stream->input->offset;
 }
 
-static int mpd_ffmpeg_close(URLContext *h)
+static struct mpd_ffmpeg_stream *
+mpd_ffmpeg_stream_open(struct decoder *decoder, struct input_stream *input)
 {
-	h->priv_data = NULL;
-	return 0;
+	struct mpd_ffmpeg_stream *stream = g_new(struct mpd_ffmpeg_stream, 1);
+	stream->decoder = decoder;
+	stream->input = input;
+	stream->io = av_alloc_put_byte(stream->buffer, sizeof(stream->buffer),
+				       false, stream,
+				       mpd_ffmpeg_stream_read, NULL,
+				       input->seekable
+				       ? mpd_ffmpeg_stream_seek : NULL);
+	if (stream->io == NULL) {
+		g_free(stream);
+		return NULL;
+	}
+
+	return stream;
 }
 
-static URLProtocol mpd_ffmpeg_fileops = {
-	.name = "mpd",
-	.url_open = mpd_ffmpeg_open,
-	.url_read = mpd_ffmpeg_read,
-	.url_seek = mpd_ffmpeg_seek,
-	.url_close = mpd_ffmpeg_close,
-};
+static void
+mpd_ffmpeg_stream_close(struct mpd_ffmpeg_stream *stream)
+{
+	av_free(stream->io);
+	g_free(stream);
+}
 
 static bool
 ffmpeg_init(G_GNUC_UNUSED const struct config_param *param)
 {
 	av_register_all();
-	register_protocol(&mpd_ffmpeg_fileops);
 	return true;
 }
 
@@ -140,64 +130,86 @@ ffmpeg_find_audio_stream(const AVFormatContext *format_context)
 	return -1;
 }
 
-/**
- * Append the suffix of the original URI to the virtual stream URI.
- * Without this, libavformat cannot detect some of the codecs
- * (e.g. "shorten").
- */
-static void
-append_uri_suffix(struct ffmpeg_stream *stream, const char *uri)
+static AVInputFormat *
+ffmpeg_probe(struct decoder *decoder, struct input_stream *is,
+	     const char *uri)
 {
-	assert(stream != NULL);
-	assert(uri != NULL);
+	enum {
+		BUFFER_SIZE = 16384,
+		PADDING = 16,
+	};
 
-	char *base = g_path_get_basename(uri);
+	unsigned char *buffer = g_malloc(BUFFER_SIZE);
+	size_t nbytes = decoder_read(decoder, is, buffer, BUFFER_SIZE);
+	if (nbytes <= PADDING || !input_stream_seek(is, 0, SEEK_SET)) {
+		g_free(buffer);
+		return NULL;
+	}
 
-	const char *suffix = strrchr(base, '.');
-	if (suffix != NULL && suffix[1] != 0)
-		g_strlcat(stream->url, suffix, sizeof(stream->url));
+	/* some ffmpeg parsers (e.g. ac3_parser.c) read a few bytes
+	   beyond the declared buffer limit, which makes valgrind
+	   angry; this workaround removes some padding from the buffer
+	   size */
+	nbytes -= PADDING;
 
-	g_free(base);
+	AVProbeData avpd = {
+		.buf = buffer,
+		.buf_size = nbytes,
+		.filename = uri,
+	};
+
+	AVInputFormat *format = av_probe_input_format(&avpd, true);
+	g_free(buffer);
+
+	return format;
 }
 
 static bool
-ffmpeg_helper(const char *uri, struct input_stream *input,
+ffmpeg_helper(const char *uri,
+	      struct decoder *decoder, struct input_stream *input,
 	      bool (*callback)(struct ffmpeg_context *ctx),
 	      struct ffmpeg_context *ctx)
 {
+	AVInputFormat *input_format = ffmpeg_probe(decoder, input, uri);
+	if (input_format == NULL)
+		return false;
+
+	g_debug("detected input format '%s' (%s)",
+		input_format->name, input_format->long_name);
+
+	struct mpd_ffmpeg_stream *stream =
+		mpd_ffmpeg_stream_open(decoder, input);
+	if (stream == NULL) {
+		g_warning("Failed to open stream");
+		return false;
+	}
+
 	AVFormatContext *format_context;
 	AVCodecContext *codec_context;
 	AVCodec *codec;
 	int audio_stream;
-	struct ffmpeg_stream stream = {
-		.url = "mpd://X", /* only the mpd:// prefix matters */
-	};
 	bool ret;
 
-	if (uri != NULL)
-		append_uri_suffix(&stream, uri);
-
-	stream.input = input;
-	if (ctx && ctx->decoder) {
-		stream.decoder = ctx->decoder; //are we in decoding loop ?
-	} else {
-		stream.decoder = NULL;
-	}
-
 	//ffmpeg works with ours "fileops" helper
-	if (av_open_input_file(&format_context, stream.url, NULL, 0, NULL) != 0) {
+	if (av_open_input_stream(&format_context, stream->io, uri,
+				 input_format, NULL) != 0) {
 		g_warning("Open failed\n");
+		mpd_ffmpeg_stream_close(stream);
 		return false;
 	}
 
 	if (av_find_stream_info(format_context)<0) {
 		g_warning("Couldn't find stream info\n");
+		av_close_input_stream(format_context);
+		mpd_ffmpeg_stream_close(stream);
 		return false;
 	}
 
 	audio_stream = ffmpeg_find_audio_stream(format_context);
 	if (audio_stream == -1) {
 		g_warning("No audio stream inside\n");
+		av_close_input_stream(format_context);
+		mpd_ffmpeg_stream_close(stream);
 		return false;
 	}
 
@@ -209,11 +221,15 @@ ffmpeg_helper(const char *uri, struct input_stream *input,
 
 	if (!codec) {
 		g_warning("Unsupported audio codec\n");
+		av_close_input_stream(format_context);
+		mpd_ffmpeg_stream_close(stream);
 		return false;
 	}
 
 	if (avcodec_open(codec_context, codec)<0) {
 		g_warning("Could not open codec\n");
+		av_close_input_stream(format_context);
+		mpd_ffmpeg_stream_close(stream);
 		return false;
 	}
 
@@ -227,7 +243,8 @@ ffmpeg_helper(const char *uri, struct input_stream *input,
 		ret = true;
 
 	avcodec_close(codec_context);
-	av_close_input_file(format_context);
+	av_close_input_stream(format_context);
+	mpd_ffmpeg_stream_close(stream);
 
 	return ret;
 }
@@ -372,8 +389,10 @@ ffmpeg_decode(struct decoder *decoder, struct input_stream *input)
 	ctx.input = input;
 	ctx.decoder = decoder;
 
-	ffmpeg_helper(decoder_get_uri(decoder), input,
+	char *uri = decoder_get_uri(decoder);
+	ffmpeg_helper(uri, decoder, input,
 		      ffmpeg_decode_internal, &ctx);
+	g_free(uri);
 }
 
 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(31<<8)+0)
@@ -401,12 +420,21 @@ static bool ffmpeg_tag_internal(struct ffmpeg_context *ctx)
 	av_metadata_conv(f, NULL, f->iformat->metadata_conv);
 
 	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_TITLE, "title");
+#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(50<<8))
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_ARTIST, "artist");
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_DATE, "date");
+#else
 	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_ARTIST, "author");
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_DATE, "year");
+#endif
 	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_ALBUM, "album");
 	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_COMMENT, "comment");
 	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_GENRE, "genre");
 	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_TRACK, "track");
-	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_DATE, "year");
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_ALBUM_ARTIST, "album_artist");
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_COMPOSER, "composer");
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_PERFORMER, "performer");
+	ffmpeg_copy_metadata(tag, f->metadata, TAG_ITEM_DISC, "disc");
 #else
 	if (f->author[0])
 		tag_add_item(tag, TAG_ITEM_ARTIST, f->author);
@@ -450,7 +478,7 @@ static struct tag *ffmpeg_tag(const char *file)
 	ctx.decoder = NULL;
 	ctx.tag = tag_new();
 
-	ret = ffmpeg_helper(file, &input, ffmpeg_tag_internal, &ctx);
+	ret = ffmpeg_helper(file, NULL, &input, ffmpeg_tag_internal, &ctx);
 	if (!ret) {
 		tag_free(ctx.tag);
 		ctx.tag = NULL;

src/decoder/mad_plugin.c

@@ -425,7 +425,27 @@ static void mp3_parse_id3(struct mp3_data *data, size_t tagsize,
 	/* This code is enabled when libid3tag is disabled.  Instead
 	   of parsing the ID3 frame, it just skips it. */
 
-	mad_stream_skip(&data->stream, tagsize);
+	size_t count = data->stream.bufend - data->stream.this_frame;
+
+	if (tagsize <= count) {
+		mad_stream_skip(&data->stream, tagsize);
+	} else {
+		mad_stream_skip(&data->stream, count);
+
+		while (count < tagsize) {
+			size_t len = tagsize - count;
+			char ignored[1024];
+			if (len > sizeof(ignored))
+				len = sizeof(ignored);
+
+			len = decoder_read(data->decoder, data->input_stream,
+					   ignored, len);
+			if (len == 0)
+				break;
+			else
+				count += len;
+		}
+	}
 #endif
 }
 
@@ -433,16 +453,16 @@ static void mp3_parse_id3(struct mp3_data *data, size_t tagsize,
 /**
  * This function emulates libid3tag when it is disabled.  Instead of
  * doing a real analyzation of the frame, it just checks whether the
- * frame begins with the string "ID3".  If so, it returns the full
- * length.
+ * frame begins with the string "ID3".  If so, it returns the length
+ * of the ID3 frame.
  */
 static signed long
 id3_tag_query(const void *p0, size_t length)
 {
 	const char *p = p0;
 
-	return length > 3 && memcmp(p, "ID3", 3) == 0
-		? length
+	return length >= 10 && memcmp(p, "ID3", 3) == 0
+		? (p[8] << 7) + p[9] + 10
 		: 0;
 }
 #endif /* !HAVE_ID3TAG */

src/decoder/mikmod_plugin.c

@@ -219,10 +219,12 @@ static struct tag *modTagDup(const char *file)
 	ret->time = 0;
 
 	path2 = g_strdup(file);
-	title = g_strdup(Player_LoadTitle(path2));
+	title = Player_LoadTitle(path2);
 	g_free(path2);
-	if (title)
+	if (title) {
 		tag_add_item(ret, TAG_ITEM_TITLE, title);
+		free(title);
+	}
 
 	return ret;
 }

src/decoder/mp4ff_plugin.c

@@ -19,6 +19,7 @@
 
 #include "../decoder_api.h"
 #include "config.h"
+#include "tag_table.h"
 
 #include <glib.h>
 
@@ -339,6 +340,22 @@ mp4_decode(struct decoder *mpd_decoder, struct input_stream *input_stream)
 	mp4ff_close(mp4fh);
 }
 
+static const char *const mp4ff_tag_names[TAG_NUM_OF_ITEM_TYPES] = {
+	[TAG_ITEM_ALBUM_ARTIST] = "album artist",
+	[TAG_ITEM_COMPOSER] = "writer",
+	[TAG_ITEM_PERFORMER] = "band",
+};
+
+static enum tag_type
+mp4ff_tag_name_parse(const char *name)
+{
+	enum tag_type type = tag_table_lookup(mp4ff_tag_names, name);
+	if (type == TAG_NUM_OF_ITEM_TYPES)
+		type = tag_name_parse_i(name);
+
+	return type;
+}
+
 static struct tag *
 mp4_tag_dup(const char *file)
 {
@@ -394,24 +411,9 @@ mp4_tag_dup(const char *file)
 
 		mp4ff_meta_get_by_index(mp4fh, i, &item, &value);
 
-		if (0 == g_ascii_strcasecmp("artist", item)) {
-			tag_add_item(ret, TAG_ITEM_ARTIST, value);
-		} else if (0 == g_ascii_strcasecmp("title", item)) {
-			tag_add_item(ret, TAG_ITEM_TITLE, value);
-		} else if (0 == g_ascii_strcasecmp("album", item)) {
-			tag_add_item(ret, TAG_ITEM_ALBUM, value);
-		} else if (0 == g_ascii_strcasecmp("track", item)) {
-			tag_add_item(ret, TAG_ITEM_TRACK, value);
-		} else if (0 == g_ascii_strcasecmp("disc", item)) {
-			/* Is that the correct id? */
-			tag_add_item(ret, TAG_ITEM_DISC, value);
-		} else if (0 == g_ascii_strcasecmp("genre", item)) {
-			tag_add_item(ret, TAG_ITEM_GENRE, value);
-		} else if (0 == g_ascii_strcasecmp("date", item)) {
-			tag_add_item(ret, TAG_ITEM_DATE, value);
-		} else if (0 == g_ascii_strcasecmp("writer", item)) {
-			tag_add_item(ret, TAG_ITEM_COMPOSER, value);
-		}
+		enum tag_type type = mp4ff_tag_name_parse(item);
+		if (type != TAG_NUM_OF_ITEM_TYPES)
+			tag_add_item(ret, type, value);
 
 		free(item);
 		free(value);

src/decoder/vorbis_plugin.c

@@ -97,6 +97,13 @@ static long ogg_tell_cb(void *vdata)
 	return (long)data->input_stream->offset;
 }
 
+static const ov_callbacks vorbis_is_callbacks = {
+	.read_func = ogg_read_cb,
+	.seek_func = ogg_seek_cb,
+	.close_func = ogg_close_cb,
+	.tell_func = ogg_tell_cb,
+};
+
 static const char *
 vorbis_comment_value(const char *comment, const char *needle)
 {
@@ -226,6 +233,9 @@ oggvorbis_seekable(struct decoder *decoder)
 	bool seekable;
 
 	uri = decoder_get_uri(decoder);
+	if (uri == NULL)
+		return false;
+
 	/* disable seeking on remote streams, because libvorbis seeks
 	   around like crazy, and due to being very expensive, this
 	   delays song playback my 10 or 20 seconds */
@@ -241,7 +251,6 @@ vorbis_stream_decode(struct decoder *decoder,
 		     struct input_stream *input_stream)
 {
 	OggVorbis_File vf;
-	ov_callbacks callbacks;
 	OggCallbackData data;
 	struct audio_format audio_format;
 	int current_section;
@@ -266,13 +275,9 @@ vorbis_stream_decode(struct decoder *decoder,
 	data.input_stream = input_stream;
 	data.seekable = input_stream->seekable && oggvorbis_seekable(decoder);
 
-	callbacks.read_func = ogg_read_cb;
-	callbacks.seek_func = ogg_seek_cb;
-	callbacks.close_func = ogg_close_cb;
-	callbacks.tell_func = ogg_tell_cb;
-	if ((ret = ov_open_callbacks(&data, &vf, NULL, 0, callbacks)) < 0) {
+	if ((ret = ov_open_callbacks(&data, &vf, NULL, 0,
+				     vorbis_is_callbacks)) < 0) {
 		const char *error;
-
 		if (decoder_get_command(decoder) != DECODE_COMMAND_NONE)
 			return;
 

src/directory_print.c

@@ -22,7 +22,7 @@
 #include "client.h"
 #include "song_print.h"
 
-static int
+static void
 dirvec_print(struct client *client, const struct dirvec *dv)
 {
 	size_t i;
@@ -30,15 +30,11 @@ dirvec_print(struct client *client, const struct dirvec *dv)
 	for (i = 0; i < dv->nr; ++i)
 		client_printf(client, DIRECTORY_DIR "%s\n",
 			      directory_get_path(dv->base[i]));
-
-	return 0;
 }
 
-int
+void
 directory_print(struct client *client, const struct directory *directory)
 {
 	dirvec_print(client, &directory->children);
 	songvec_print(client, &directory->songs);
-
-	return 0;
 }

src/directory_print.h

@@ -23,7 +23,7 @@
 struct client;
 struct directory;
 
-int
+void
 directory_print(struct client *client, const struct directory *directory);
 
 #endif

src/input/mms_input_plugin.c

@@ -49,10 +49,13 @@ input_mms_open(struct input_stream *is, const char *url)
 	m = g_new(struct input_mms, 1);
 	m->mms = mmsx_connect(NULL, NULL, url, 128 * 1024);
 	if (m->mms == NULL) {
+		g_free(m);
 		g_warning("mmsx_connect() failed");
 		return false;
 	}
 
+	m->eof = false;
+
 	/* XX is this correct?  at least this selects the ffmpeg
 	   decoder, which seems to work fine*/
 	is->mime = g_strdup("audio/x-ms-wma");

src/listen.c

@@ -407,7 +407,13 @@ static int get_remote_uid(int fd)
 
 	return cred.uid;
 #else
-	(void)fd;
+#ifdef HAVE_GETPEEREID
+	uid_t euid;
+	gid_t egid;
+
+	if (getpeereid(fd, &euid, &egid) == 0)
+		return euid;
+#endif
 	return -1;
 #endif
 }

src/locate.c

@@ -42,9 +42,9 @@ locate_parse_type(const char *str)
 	if (0 == g_ascii_strcasecmp(str, LOCATE_TAG_ANY_KEY))
 		return LOCATE_TAG_ANY_TYPE;
 
-	for (i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++)
-		if (0 == g_ascii_strcasecmp(str, tag_item_names[i]))
-			return i;
+	i = tag_name_parse_i(str);
+	if (i != TAG_NUM_OF_ITEM_TYPES)
+		return i;
 
 	return -1;
 }

src/pcm_buffer.h

@@ -28,7 +28,7 @@
  * would put too much stress on the allocator.
  */
 struct pcm_buffer {
-	char *buffer;
+	void *buffer;
 
 	size_t size;
 };

src/playlist_control.c

@@ -24,6 +24,7 @@
 
 #include "playlist_internal.h"
 #include "player_control.h"
+#include "idle.h"
 
 #include <glib.h>
 
@@ -156,6 +157,8 @@ nextSongInPlaylist(struct playlist *playlist)
 	if (next_order < 0) {
 		/* cancel single */
 		playlist->queue.single = false;
+		idle_add(IDLE_OPTIONS);
+
 		/* no song after this one: stop playback */
 		stopPlaylist(playlist);
 

src/tag.c

@@ -64,6 +64,36 @@ const char *tag_item_names[TAG_NUM_OF_ITEM_TYPES] = {
 
 bool ignore_tag_items[TAG_NUM_OF_ITEM_TYPES];
 
+enum tag_type
+tag_name_parse(const char *name)
+{
+	assert(name != NULL);
+
+	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
+		assert(tag_item_names[i] != NULL);
+
+		if (strcmp(name, tag_item_names[i]) == 0)
+			return (enum tag_type)i;
+	}
+
+	return TAG_NUM_OF_ITEM_TYPES;
+}
+
+enum tag_type
+tag_name_parse_i(const char *name)
+{
+	assert(name != NULL);
+
+	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
+		assert(tag_item_names[i] != NULL);
+
+		if (g_ascii_strcasecmp(name, tag_item_names[i]) == 0)
+			return (enum tag_type)i;
+	}
+
+	return TAG_NUM_OF_ITEM_TYPES;
+}
+
 static size_t items_size(const struct tag *tag)
 {
 	return tag->num_items * sizeof(struct tag_item *);
@@ -76,7 +106,7 @@ void tag_lib_init(void)
 	char *temp;
 	char *s;
 	char *c;
-	int i;
+	enum tag_type type;
 
 	/* parse the "metadata_to_use" config parameter below */
 
@@ -98,16 +128,18 @@ void tag_lib_init(void)
 			if (*s == '\0')
 				quit = 1;
 			*s = '\0';
-			for (i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++) {
-				if (g_ascii_strcasecmp(c, tag_item_names[i]) == 0) {
-					ignore_tag_items[i] = false;
-					break;
-				}
-			}
-			if (strlen(c) && i == TAG_NUM_OF_ITEM_TYPES) {
+
+			c = g_strstrip(c);
+			if (*c == 0)
+				continue;
+
+			type = tag_name_parse_i(c);
+			if (type == TAG_NUM_OF_ITEM_TYPES)
 				g_error("error parsing metadata item \"%s\"",
 					c);
-			}
+
+			ignore_tag_items[type] = false;
+
 			s++;
 			c = s;
 		}

src/tag.h

@@ -93,6 +93,22 @@ struct tag {
 	unsigned num_items;
 };
 
+/**
+ * Parse the string, and convert it into a #tag_type.  Returns
+ * #TAG_NUM_OF_ITEM_TYPES if the string could not be recognized.
+ */
+enum tag_type
+tag_name_parse(const char *name);
+
+/**
+ * Parse the string, and convert it into a #tag_type.  Returns
+ * #TAG_NUM_OF_ITEM_TYPES if the string could not be recognized.
+ *
+ * Case does not matter.
+ */
+enum tag_type
+tag_name_parse_i(const char *name);
+
 /**
  * Creates an empty #tag.
  */

src/tag_ape.c

@@ -19,12 +19,47 @@
 
 #include "tag_ape.h"
 #include "tag.h"
+#include "tag_table.h"
 
 #include <glib.h>
 
 #include <assert.h>
 #include <stdio.h>
 
+static const char *const ape_tag_names[TAG_NUM_OF_ITEM_TYPES] = {
+	[TAG_ITEM_ALBUM_ARTIST] = "album artist",
+	[TAG_ITEM_DATE] = "year"
+};
+
+static enum tag_type
+tag_ape_name_parse(const char *name)
+{
+	enum tag_type type = tag_table_lookup(ape_tag_names, name);
+	if (type == TAG_NUM_OF_ITEM_TYPES)
+		type = tag_name_parse_i(name);
+
+	return type;
+}
+
+static struct tag *
+tag_ape_import_item(struct tag *tag, unsigned long flags,
+		    const char *key, const char *value, size_t value_length)
+{
+	/* we only care about utf-8 text tags */
+	if ((flags & (0x3 << 1)) != 0)
+		return tag;
+
+	enum tag_type type = tag_ape_name_parse(key);
+	if (type == TAG_NUM_OF_ITEM_TYPES)
+		return tag;
+
+	if (tag == NULL)
+		tag = tag_new();
+	tag_add_item_n(tag, type, value, value_length);
+
+	return tag;
+}
+
 struct tag *
 tag_ape_load(const char *file)
 {
@@ -36,7 +71,6 @@ tag_ape_load(const char *file)
 	size_t tagLen;
 	size_t size;
 	unsigned long flags;
-	int i;
 	char *key;
 
 	struct {
@@ -48,26 +82,6 @@ tag_ape_load(const char *file)
 		unsigned char reserved[8];
 	} footer;
 
-	const char *apeItems[7] = {
-		"title",
-		"artist",
-		"album",
-		"comment",
-		"genre",
-		"track",
-		"year"
-	};
-
-	int tagItems[7] = {
-		TAG_ITEM_TITLE,
-		TAG_ITEM_ARTIST,
-		TAG_ITEM_ALBUM,
-		TAG_ITEM_COMMENT,
-		TAG_ITEM_GENRE,
-		TAG_ITEM_TRACK,
-		TAG_ITEM_DATE,
-	};
-
 	fp = fopen(file, "r");
 	if (!fp)
 		return NULL;
@@ -127,17 +141,8 @@ tag_ape_load(const char *file)
 		if (tagLen < size)
 			goto fail;
 
-		/* we only care about utf-8 text tags */
-		if (!(flags & (0x3 << 1))) {
-			for (i = 0; i < 7; i++) {
-				if (g_ascii_strcasecmp(key, apeItems[i]) == 0) {
-					if (!ret)
-						ret = tag_new();
-					tag_add_item_n(ret, tagItems[i],
-						       p, size);
-				}
-			}
-		}
+		ret = tag_ape_import_item(ret, flags, key, p, size);
+
 		p += size;
 		tagLen -= size;
 	}

src/tag_table.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2003-2010 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_TAG_TABLE_H
+#define MPD_TAG_TABLE_H
+
+#include "tag.h"
+
+#include <glib.h>
+
+/**
+ * Looks up a string in a tag translation table (case insensitive).
+ * Returns TAG_NUM_OF_ITEM_TYPES if the specified name was not found
+ * in the table.
+ */
+static inline enum tag_type
+tag_table_lookup(const char *const* table, const char *name)
+{
+	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++)
+		if (table[i] != NULL &&
+		    g_ascii_strcasecmp(name, table[i]) == 0)
+			return (enum tag_type)i;
+
+	return TAG_NUM_OF_ITEM_TYPES;
+}
+
+#endif