mechanism for updating metadata while decoding

vorbis comments are updated on the fly for streams
need to decode icy metadata
buffering of metadata needs to be hardened, to ensure that player has already read a particular metachunk or passed over it

git-svn-id: https://svn.musicpd.org/mpd/trunk@1358 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 46 insertions, 0 deletions

diff --git a/src/metadataChunk.c b/src/metadataChunk.c
new file mode 100644
index 000000000..1deab3d90
--- /dev/null
+++ b/src/metadataChunk.c
@@ -0,0 +1,46 @@
+#include "metadataChunk.h"
+
+#include <string.h>
+
+void initMetadataChunk(MetadataChunk * chunk) {
+	memset(chunk, 0, sizeof(MetadataChunk));
+	
+	chunk->name = -1;
+	chunk->artist = -1;
+	chunk->album = -1;
+	chunk->title = -1;
+}
+
+MpdTag * metadataChunkToMpdTagDup(MetadataChunk * chunk) {
+	MpdTag * ret = newMpdTag();
+
+	if(chunk->name >= 0) ret->name = strdup(chunk->buffer+chunk->name);
+	if(chunk->artist >= 0) ret->artist = strdup(chunk->buffer+chunk->artist);
+	if(chunk->album >= 0) ret->album = strdup(chunk->buffer+chunk->album);
+	if(chunk->title >= 0) ret->title = strdup(chunk->buffer+chunk->title);
+
+	return ret;
+}
+
+#define copyStringToChunk(string, element) { \
+	if(string && (slen = strlen(string)) && \
+                        pos < METADATA_BUFFER_LENGTH-1) \
+        { \
+		strncpy(chunk->buffer+pos, string, \
+                                METADATA_BUFFER_LENGTH-1-pos); \
+		element = pos; \
+		pos += slen+1; \
+	} \
+}
+
+void copyMpdTagToMetadataChunk(MpdTag * tag, MetadataChunk * chunk) {
+	int pos = 0;
+	int slen;
+
+	initMetadataChunk(chunk);
+
+	copyStringToChunk(tag->name, chunk->name);
+	copyStringToChunk(tag->title, chunk->title);
+	copyStringToChunk(tag->artist, chunk->artist);
+	copyStringToChunk(tag->album, chunk->album);
+}