1 files changed, 87 insertions, 0 deletions
diff --git a/src/MusicChunk.cxx b/src/MusicChunk.cxx
new file mode 100644
index 000000000..e79cc3ee9
--- /dev/null
+++ b/src/MusicChunk.cxx
@@ -0,0 +1,87 @@
+/*
+ * 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 "MusicChunk.hxx"
+#include "audio_format.h"
+
+extern "C" {
+#include "tag.h"
+}
+
+#include <assert.h>
+
+music_chunk::~music_chunk()
+{
+	if (tag != NULL)
+		tag_free(tag);
+}
+
+#ifndef NDEBUG
+bool
+music_chunk::CheckFormat(const struct audio_format &other_format) const
+{
+	assert(audio_format_valid(&other_format));
+
+	return length == 0 ||
+		audio_format_equals(&audio_format, &other_format);
+}
+#endif
+
+void *
+music_chunk::Write(const struct audio_format &af,
+		   float data_time, uint16_t _bit_rate,
+		   size_t *max_length_r)
+{
+	assert(CheckFormat(af));
+	assert(length == 0 || audio_format_valid(&audio_format));
+
+	if (length == 0) {
+		/* if the chunk is empty, nobody has set bitRate and
+		   times yet */
+
+		bit_rate = _bit_rate;
+		times = data_time;
+	}
+
+	const size_t frame_size = audio_format_frame_size(&af);
+	size_t num_frames = (sizeof(data) - length) / frame_size;
+	if (num_frames == 0)
+		return NULL;
+
+#ifndef NDEBUG
+	audio_format = af;
+#endif
+
+	*max_length_r = num_frames * frame_size;
+	return data + length;
+}
+
+bool
+music_chunk::Expand(const struct audio_format &af, size_t _length)
+{
+	const size_t frame_size = audio_format_frame_size(&af);
+
+	assert(length + _length <= sizeof(data));
+	assert(audio_format_equals(&audio_format, &af));
+
+	length += _length;
+
+	return length + frame_size > sizeof(data);
+}