tag/Chromaprint: OO wrapper for a ChromaprintContext

src/tag/Chromaprint.hxx

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2003-2018 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_CHROMAPRINT_HXX
+#define MPD_CHROMAPRINT_HXX
+
+#include "util/ScopeExit.hxx"
+
+#include <chromaprint.h>
+
+#include <stdexcept>
+#include <string>
+
+namespace Chromaprint {
+
+class Context {
+	ChromaprintContext *const ctx;
+
+public:
+	Context() noexcept
+		:ctx(chromaprint_new(CHROMAPRINT_ALGORITHM_DEFAULT)) {}
+
+	~Context() noexcept {
+		chromaprint_free(ctx);
+	}
+
+	Context(const Context &) = delete;
+	Context &operator=(const Context &) = delete;
+
+	void Start(unsigned sample_rate, unsigned num_channels) {
+		if (chromaprint_start(ctx, sample_rate, num_channels) != 1)
+			throw std::runtime_error("chromaprint_start() failed");
+	}
+
+	void Feed(const int16_t *data, size_t size) {
+		if (chromaprint_feed(ctx, data, size) != 1)
+			throw std::runtime_error("chromaprint_feed() failed");
+	}
+
+	void Finish() {
+		if (chromaprint_finish(ctx) != 1)
+			throw std::runtime_error("chromaprint_finish() failed");
+	}
+
+	std::string GetFingerprint() const {
+		char *fingerprint;
+		if (chromaprint_get_fingerprint(ctx, &fingerprint) != 1)
+			throw std::runtime_error("chromaprint_get_fingerprint() failed");
+
+		AtScopeExit(fingerprint) { chromaprint_dealloc(fingerprint); };
+		return fingerprint;
+	}
+};
+
+} //namespace Chromaprint
+
+#endif

src/tag/meson.build

@@ -33,6 +33,9 @@ if libid3tag_dep.found()
   ]
 endif
 
+chromaprint_dep = dependency('libchromaprint', required: get_option('chromaprint'))
+conf.set('ENABLE_CHROMAPRINT', chromaprint_dep.found())
+
 tag = static_library(
   'tag',
   tag_sources,