1 files changed, 106 insertions, 0 deletions
diff --git a/src/MusicPipe.cxx b/src/MusicPipe.cxx
new file mode 100644
index 000000000..eadf526e1
--- /dev/null
+++ b/src/MusicPipe.cxx
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2003-2011 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 "MusicPipe.hxx"
+#include "MusicBuffer.hxx"
+#include "MusicChunk.hxx"
+
+#ifndef NDEBUG
+
+bool
+MusicPipe::Contains(const music_chunk *chunk) const
+{
+	const ScopeLock protect(mutex);
+
+	for (const struct music_chunk *i = head; i != nullptr; i = i->next)
+		if (i == chunk)
+			return true;
+
+	return false;
+}
+
+#endif
+
+music_chunk *
+MusicPipe::Shift()
+{
+	const ScopeLock protect(mutex);
+
+	music_chunk *chunk = head;
+	if (chunk != nullptr) {
+		assert(!chunk->IsEmpty());
+
+		head = chunk->next;
+		--size;
+
+		if (head == nullptr) {
+			assert(size == 0);
+			assert(tail_r == &chunk->next);
+
+			tail_r = &head;
+		} else {
+			assert(size > 0);
+			assert(tail_r != &chunk->next);
+		}
+
+#ifndef NDEBUG
+		/* poison the "next" reference */
+		chunk->next = (music_chunk *)(void *)0x01010101;
+
+		if (size == 0)
+			audio_format.Clear();
+#endif
+	}
+
+	return chunk;
+}
+
+void
+MusicPipe::Clear(MusicBuffer &buffer)
+{
+	music_chunk *chunk;
+
+	while ((chunk = Shift()) != nullptr)
+		buffer.Return(chunk);
+}
+
+void
+MusicPipe::Push(music_chunk *chunk)
+{
+	assert(!chunk->IsEmpty());
+	assert(chunk->length == 0 || chunk->audio_format.IsValid());
+
+	const ScopeLock protect(mutex);
+
+	assert(size > 0 || !audio_format.IsDefined());
+	assert(!audio_format.IsDefined() ||
+	       chunk->CheckFormat(audio_format));
+
+#ifndef NDEBUG
+	if (!audio_format.IsDefined() && chunk->length > 0)
+		audio_format = chunk->audio_format;
+#endif
+
+	chunk->next = nullptr;
+	*tail_r = chunk;
+	tail_r = &chunk->next;
+
+	++size;
+}