pcm/MixRampAnalyzer: a MixRamp implementation

test/RunMixRampAnalyzer.cxx

@@ -0,0 +1,85 @@
+/*
+ * 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/MixRampAnalyzer.hxx"
+#include "io/FileDescriptor.hxx"
+#include "util/ConstBuffer.hxx"
+#include "util/PrintException.hxx"
+
+#include <array>
+#include <memory>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(int, char **) noexcept
+try {
+	constexpr std::size_t frame_size = sizeof(ReplayGainAnalyzer::Frame);
+
+	const FileDescriptor input_fd(STDIN_FILENO);
+
+	MixRampAnalyzer a;
+
+	while (true) {
+		std::array<ReplayGainAnalyzer::Frame, 4096> buffer;
+
+		size_t nbytes = ReadFrames(input_fd,
+					   buffer.data(), sizeof(buffer),
+					   frame_size);
+		if (nbytes == 0)
+			break;
+
+		const std::size_t n_frames = nbytes / frame_size;
+		a.Process({buffer.data(), n_frames});
+	}
+
+	const auto data = a.GetResult();
+
+	const auto total_time = a.GetTime();
+
+	printf("MIXRAMP_START=");
+
+	MixRampItem last{};
+
+	for (const auto &i : data.start) {
+		if (i.time >= FloatDuration{} && i != last) {
+			printf("%.2f %.2f;", i.volume, i.time.count());
+			last = i;
+		}
+	}
+
+	printf("\n");
+
+	printf("MIXRAMP_END=");
+	last = {};
+	for (const auto &i : data.end) {
+		if (i.time >= FloatDuration{} && i != last) {
+			printf("%.2f %.2f;", i.volume, (total_time - i.time).count());
+			last = i;
+		}
+	}
+	printf("\n");
+
+	return EXIT_SUCCESS;
+} catch (...) {
+	PrintException(std::current_exception());
+	return EXIT_FAILURE;
+}

test/meson.build

@@ -567,6 +567,17 @@ executable(
   ],
 )
 
+executable(
+  'RunMixRampAnalyzer',
+  'RunMixRampAnalyzer.cxx',
+  'ReadFrames.cxx',
+  include_directories: inc,
+  dependencies: [
+    pcm_dep,
+    io_dep,
+  ],
+)
+
 #
 # Encoder
 #