tag/Chromaprint: move to lib/chromaprint/Context.hxx

src/lib/chromaprint/Context.hxx

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2018-2019 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CHROMAPRINT_HXX
+#define 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