buffer, pipe: convert to C++

src/MusicChunk.cxx

@@ -0,0 +1,105 @@
+/*
+ * 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>
+
+void
+music_chunk_init(struct music_chunk *chunk)
+{
+	chunk->other = NULL;
+	chunk->length = 0;
+	chunk->tag = NULL;
+	chunk->replay_gain_serial = 0;
+}
+
+void
+music_chunk_free(struct music_chunk *chunk)
+{
+	if (chunk->tag != NULL)
+		tag_free(chunk->tag);
+}
+
+#ifndef NDEBUG
+bool
+music_chunk_check_format(const struct music_chunk *chunk,
+			 const struct audio_format *audio_format)
+{
+	assert(chunk != NULL);
+	assert(audio_format != NULL);
+	assert(audio_format_valid(audio_format));
+
+	return chunk->length == 0 ||
+		audio_format_equals(&chunk->audio_format, audio_format);
+}
+#endif
+
+void *
+music_chunk_write(struct music_chunk *chunk,
+		  const struct audio_format *audio_format,
+		  float data_time, uint16_t bit_rate,
+		  size_t *max_length_r)
+{
+	const size_t frame_size = audio_format_frame_size(audio_format);
+	size_t num_frames;
+
+	assert(music_chunk_check_format(chunk, audio_format));
+	assert(chunk->length == 0 || audio_format_valid(&chunk->audio_format));
+
+	if (chunk->length == 0) {
+		/* if the chunk is empty, nobody has set bitRate and
+		   times yet */
+
+		chunk->bit_rate = bit_rate;
+		chunk->times = data_time;
+	}
+
+	num_frames = (sizeof(chunk->data) - chunk->length) / frame_size;
+	if (num_frames == 0)
+		return NULL;
+
+#ifndef NDEBUG
+	chunk->audio_format = *audio_format;
+#endif
+
+	*max_length_r = num_frames * frame_size;
+	return chunk->data + chunk->length;
+}
+
+bool
+music_chunk_expand(struct music_chunk *chunk,
+		   const struct audio_format *audio_format, size_t length)
+{
+	const size_t frame_size = audio_format_frame_size(audio_format);
+
+	assert(chunk != NULL);
+	assert(chunk->length + length <= sizeof(chunk->data));
+	assert(audio_format_equals(&chunk->audio_format, audio_format));
+
+	chunk->length += length;
+
+	return chunk->length + frame_size > sizeof(chunk->data);
+}