Tag: add method Clear()

Allow reusing Tag instances.

src/Tag.cxx

@@ -132,6 +132,22 @@ void tag_lib_init(void)
 	g_free(temp);
 }
 
+void
+Tag::Clear()
+{
+	time = -1;
+	has_playlist = false;
+
+	tag_pool_lock.lock();
+	for (unsigned i = 0; i < num_items; ++i)
+		tag_pool_put_item(items[i]);
+	tag_pool_lock.unlock();
+
+	g_free(items);
+	items = nullptr;
+	num_items = 0;
+}
+
 void
 Tag::DeleteItem(unsigned idx)
 {

src/Tag.hxx

@@ -112,6 +112,11 @@ struct Tag {
 		return !IsEmpty() || time >= 0;
 	}
 
+	/**
+	 * Clear everything, as if this was a new Tag object.
+	 */
+	void Clear();
+
 	void DeleteItem(unsigned i);
 
 	/**

src/decoder/FlacCommon.cxx

@@ -36,16 +36,10 @@ flac_data::flac_data(struct decoder *_decoder,
 	:FlacInput(_input_stream, _decoder),
 	 initialized(false), unsupported(false),
 	 total_frames(0), first_frame(0), next_frame(0), position(0),
-	 decoder(_decoder), input_stream(_input_stream),
-	 tag(nullptr)
+	 decoder(_decoder), input_stream(_input_stream)
 {
 }
 
-flac_data::~flac_data()
-{
-	delete tag;
-}
-
 static enum sample_format
 flac_sample_format(unsigned bits_per_sample)
 {
@@ -116,9 +110,8 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 			decoder_mixramp(data->decoder,
 					mixramp_start, mixramp_end);
 
-		if (data->tag != nullptr)
-			flac_vorbis_comments_to_tag(data->tag,
-						    &block->data.vorbis_comment);
+		flac_vorbis_comments_to_tag(data->tag,
+					    &block->data.vorbis_comment);
 
 	default:
 		break;

src/decoder/FlacCommon.hxx

@@ -81,10 +81,9 @@ struct flac_data : public FlacInput {
 	struct decoder *decoder;
 	struct input_stream *input_stream;
 
-	Tag *tag;
+	Tag tag;
 
 	flac_data(struct decoder *decoder, struct input_stream *input_stream);
-	~flac_data();
 };
 
 void flac_metadata_common_cb(const FLAC__StreamMetadata * block,

src/decoder/FlacDecoderPlugin.cxx

@@ -172,11 +172,10 @@ flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
 	data->first_frame = t_start;
 
 	while (true) {
-		if (data->tag != nullptr && !data->tag->IsEmpty()) {
+		if (!data->tag.IsEmpty()) {
 			cmd = decoder_tag(data->decoder, data->input_stream,
-					  std::move(*data->tag));
-			delete data->tag;
-			data->tag = new Tag();
+					  std::move(data->tag));
+			data->tag.Clear();
 		} else
 			cmd = decoder_get_command(decoder);
 
@@ -260,7 +259,6 @@ flac_decode_internal(struct decoder * decoder,
 		return;
 
 	struct flac_data data(decoder, input_stream);
-	data.tag = new Tag();
 
 	FLAC__StreamDecoderInitStatus status =
 		stream_init(flac_dec, &data, is_ogg);

src/decoder/FlacMetadata.cxx

@@ -228,10 +228,10 @@ flac_scan_metadata(const FLAC__StreamMetadata *block,
 }
 
 void
-flac_vorbis_comments_to_tag(Tag *tag,
+flac_vorbis_comments_to_tag(Tag &tag,
 			    const FLAC__StreamMetadata_VorbisComment *comment)
 {
-	flac_scan_comments(comment, &add_tag_handler, tag);
+	flac_scan_comments(comment, &add_tag_handler, &tag);
 }
 
 void

src/decoder/FlacMetadata.hxx

@@ -130,7 +130,7 @@ flac_parse_mixramp(char **mixramp_start, char **mixramp_end,
 		   const FLAC__StreamMetadata *block);
 
 void
-flac_vorbis_comments_to_tag(Tag *tag,
+flac_vorbis_comments_to_tag(Tag &tag,
 			    const FLAC__StreamMetadata_VorbisComment *comment);
 
 void