pcm/ReplayGainAnalyzer: new library

test/RunReplayGainAnalyzer.cxx

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2003-2021 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.
+ */
+
+#include "ReadFrames.hxx"
+#include "pcm/ReplayGainAnalyzer.hxx"
+#include "io/FileDescriptor.hxx"
+#include "system/Error.hxx"
+#include "util/ConstBuffer.hxx"
+#include "util/PrintException.hxx"
+
+#include <array>
+#include <memory>
+
+#include <stdlib.h>
+
+int
+main(int, char **) noexcept
+try {
+	WindowReplayGainAnalyzer a;
+
+	constexpr std::size_t frame_size = ReplayGainAnalyzer::CHANNELS *
+		sizeof(ReplayGainAnalyzer::sample_type);
+
+	const FileDescriptor input_fd(STDIN_FILENO);
+
+	while (true) {
+		std::array<ReplayGainAnalyzer::Frame, 1024> buffer;
+
+		size_t nbytes = ReadFrames(input_fd,
+					   buffer.data(), sizeof(buffer),
+					   frame_size);
+		if (nbytes == 0)
+			break;
+
+		a.Process({buffer.data(), nbytes / frame_size});
+	}
+
+	a.Flush();
+
+	printf("gain = %+.2f dB\n", (double)a.GetGain());
+	printf("peak = %.6f\n", (double)a.GetPeak());
+
+	return EXIT_SUCCESS;
+} catch (...) {
+	PrintException(std::current_exception());
+	return EXIT_FAILURE;
+}

test/meson.build

@@ -556,6 +556,17 @@ executable(
   ],
 )
 
+executable(
+  'RunReplayGainAnalyzer',
+  'RunReplayGainAnalyzer.cxx',
+  'ReadFrames.cxx',
+  include_directories: inc,
+  dependencies: [
+    pcm_dep,
+    io_dep,
+  ],
+)
+
 #
 # Encoder
 #