pcm_dsd: convert to C++

src/pcm/PcmDsd.cxx

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2003-2013 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 "config.h"
+#include "PcmDsd.hxx"
+#include "dsd2pcm/dsd2pcm.h"
+
+#include <glib.h>
+
+#include <algorithm>
+
+#include <string.h>
+
+PcmDsd::PcmDsd()
+{
+	pcm_buffer_init(&buffer);
+
+	std::fill_n(dsd2pcm, G_N_ELEMENTS(dsd2pcm), nullptr);
+}
+
+PcmDsd::~PcmDsd()
+{
+	pcm_buffer_deinit(&buffer);
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(dsd2pcm); ++i)
+		if (dsd2pcm[i] != nullptr)
+			dsd2pcm_destroy(dsd2pcm[i]);
+}
+
+void
+PcmDsd::Reset()
+{
+	for (unsigned i = 0; i < G_N_ELEMENTS(dsd2pcm); ++i)
+		if (dsd2pcm[i] != nullptr)
+			dsd2pcm_reset(dsd2pcm[i]);
+}
+
+const float *
+PcmDsd::ToFloat(unsigned channels, bool lsbfirst,
+		const uint8_t *src, size_t src_size,
+		size_t *dest_size_r)
+{
+	assert(src != nullptr);
+	assert(src_size > 0);
+	assert(src_size % channels == 0);
+	assert(channels <= G_N_ELEMENTS(dsd2pcm));
+
+	const unsigned num_samples = src_size;
+	const unsigned num_frames = src_size / channels;
+
+	float *dest;
+	const size_t dest_size = num_samples * sizeof(*dest);
+	*dest_size_r = dest_size;
+	dest = (float *)pcm_buffer_get(&buffer, dest_size);
+
+	for (unsigned c = 0; c < channels; ++c) {
+		if (dsd2pcm[c] == nullptr) {
+			dsd2pcm[c] = dsd2pcm_init();
+			if (dsd2pcm[c] == nullptr)
+				return nullptr;
+		}
+
+		dsd2pcm_translate(dsd2pcm[c], num_frames,
+				  src + c, channels,
+				  lsbfirst, dest + c, channels);
+	}
+
+	return dest;
+}