From 5799070fea8f11ced32d57c6c38017c7671b0773 Mon Sep 17 00:00:00 2001
From: Jon Bergli Heier <snakebite@jvnv.net>
Date: Thu, 30 Dec 2010 18:38:50 +0100
Subject: Added an ID3 tag reader.

---
 SConstruct |  1 +
 tag.cpp    | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tag.h      | 21 +++++++++++++++++++++
 3 files changed, 75 insertions(+)
 create mode 100644 tag.cpp
 create mode 100644 tag.h

diff --git a/SConstruct b/SConstruct
index bb8f8bd..baf9f5d 100644
--- a/SConstruct
+++ b/SConstruct
@@ -20,6 +20,7 @@ else:
 	env.Append(CCFLAGS = ['-Wall', '-g'])
 
 env.ParseConfig('pkg-config --cflags --libs libmpg123')
+env.ParseConfig('pkg-config --cflags --libs id3tag')
 
 env.Program('audistd', Glob('*.cpp') + Glob('decoders/*.cpp') + Glob('encoders/*.cpp'))
 
diff --git a/tag.cpp b/tag.cpp
new file mode 100644
index 0000000..833735a
--- /dev/null
+++ b/tag.cpp
@@ -0,0 +1,53 @@
+#include "tag.h"
+
+#include <id3tag.h>
+
+#include <cstdlib>
+#include <stdexcept>
+
+void ID3Tag::tag_add_string(struct id3_tag *id3tag, const char *type, const char *id) {
+	struct id3_frame *frame = id3_tag_findframe(id3tag, id, 0);
+
+	if(frame == NULL) {
+		return;
+	}
+
+	if(frame->nfields != 2) {
+		throw std::runtime_error("unexpected nfields value");
+	}
+
+	const union id3_field *field = id3_frame_field(frame, 1);
+	unsigned int nstrings = id3_field_getnstrings(field);
+
+	for(unsigned int i = 0; i < nstrings; i++) {
+		const id3_ucs4_t *ucs4 = id3_field_getstrings(field, i);
+
+		if(ucs4 == NULL) {
+			throw std::runtime_error("ucs4 is NULL");
+		}
+
+		id3_utf8_t *utf8 = id3_ucs4_utf8duplicate(ucs4);
+		fields[type] = (char*)utf8;
+		free(utf8);
+	}
+}
+
+ID3Tag::ID3Tag(const std::string filename) {
+	struct id3_file *file = id3_file_open(filename.c_str(), ID3_FILE_MODE_READONLY);
+
+	if(file == NULL) {
+		throw std::runtime_error("failed to open file for reading");
+	}
+
+	struct id3_tag *id3tag = id3_file_tag(file);
+
+	if(id3tag == NULL) {
+		throw std::runtime_error("tag is NULL");
+	}
+
+	tag_add_string(id3tag, "artist", ID3_FRAME_ARTIST);
+	tag_add_string(id3tag, "title", ID3_FRAME_TITLE);
+	tag_add_string(id3tag, "album", ID3_FRAME_ALBUM);
+
+	id3_file_close(file);
+}
diff --git a/tag.h b/tag.h
new file mode 100644
index 0000000..83a1f6d
--- /dev/null
+++ b/tag.h
@@ -0,0 +1,21 @@
+#ifndef TAG_H
+#define TAG_H
+
+#include <string>
+#include <map>
+
+class Tag {
+	public:
+		typedef std::map<std::string, std::string> Fields;
+		Fields fields;
+};
+
+class ID3Tag : public Tag {
+	private:
+		void tag_add_string(struct id3_tag *id3tag, const char *type, const char *id);
+
+	public:
+		ID3Tag(const std::string filename);
+};
+
+#endif
-- 
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