buffer, pipe: convert to C++

src/MusicPipe.hxx

@@ -0,0 +1,112 @@
+/*
+ * 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.
+ */
+
+#ifndef MPD_PIPE_H
+#define MPD_PIPE_H
+
+#include "gcc.h"
+
+#ifndef NDEBUG
+struct audio_format;
+#endif
+
+struct music_chunk;
+struct music_buffer;
+
+/**
+ * A queue of #music_chunk objects.  One party appends chunks at the
+ * tail, and the other consumes them from the head.
+ */
+struct music_pipe;
+
+/**
+ * Creates a new #music_pipe object.  It is empty.
+ */
+gcc_malloc
+struct music_pipe *
+music_pipe_new(void);
+
+/**
+ * Frees the object.  It must be empty now.
+ */
+void
+music_pipe_free(struct music_pipe *mp);
+
+#ifndef NDEBUG
+
+/**
+ * Checks if the audio format if the chunk is equal to the specified
+ * audio_format.
+ */
+bool
+music_pipe_check_format(const struct music_pipe *pipe,
+			const struct audio_format *audio_format);
+
+/**
+ * Checks if the specified chunk is enqueued in the music pipe.
+ */
+bool
+music_pipe_contains(const struct music_pipe *mp,
+		    const struct music_chunk *chunk);
+
+#endif
+
+/**
+ * Returns the first #music_chunk from the pipe.  Returns NULL if the
+ * pipe is empty.
+ */
+gcc_pure
+const struct music_chunk *
+music_pipe_peek(const struct music_pipe *mp);
+
+/**
+ * Removes the first chunk from the head, and returns it.
+ */
+struct music_chunk *
+music_pipe_shift(struct music_pipe *mp);
+
+/**
+ * Clears the whole pipe and returns the chunks to the buffer.
+ *
+ * @param buffer the buffer object to return the chunks to
+ */
+void
+music_pipe_clear(struct music_pipe *mp, struct music_buffer *buffer);
+
+/**
+ * Pushes a chunk to the tail of the pipe.
+ */
+void
+music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk);
+
+/**
+ * Returns the number of chunks currently in this pipe.
+ */
+gcc_pure
+unsigned
+music_pipe_size(const struct music_pipe *mp);
+
+gcc_pure
+static inline bool
+music_pipe_empty(const struct music_pipe *mp)
+{
+	return music_pipe_size(mp) == 0;
+}
+
+#endif