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channelmap.h

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+/*
+ * Copyright 2011-2013 Various Authors
+ * Copyright 2011 Johannes Weißl
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CMUS_CHANNELMAP_H
+#define CMUS_CHANNELMAP_H
+
+#include <string.h>
+
+#define CHANNELS_MAX 32
+
+/* Modelled after PulseAudio */
+enum channel_position {
+	CHANNEL_POSITION_INVALID = -1,
+	CHANNEL_POSITION_MONO = 0,
+	CHANNEL_POSITION_FRONT_LEFT,
+	CHANNEL_POSITION_FRONT_RIGHT,
+	CHANNEL_POSITION_FRONT_CENTER,
+
+	CHANNEL_POSITION_LEFT = CHANNEL_POSITION_FRONT_LEFT,
+	CHANNEL_POSITION_RIGHT = CHANNEL_POSITION_FRONT_RIGHT,
+	CHANNEL_POSITION_CENTER = CHANNEL_POSITION_FRONT_CENTER,
+
+	CHANNEL_POSITION_REAR_CENTER,
+	CHANNEL_POSITION_REAR_LEFT,
+	CHANNEL_POSITION_REAR_RIGHT,
+
+	CHANNEL_POSITION_LFE,
+	CHANNEL_POSITION_SUBWOOFER = CHANNEL_POSITION_LFE,
+
+	CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
+	CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
+
+	CHANNEL_POSITION_SIDE_LEFT,
+	CHANNEL_POSITION_SIDE_RIGHT,
+
+	CHANNEL_POSITION_TOP_CENTER,
+
+	CHANNEL_POSITION_TOP_FRONT_LEFT,
+	CHANNEL_POSITION_TOP_FRONT_RIGHT,
+	CHANNEL_POSITION_TOP_FRONT_CENTER,
+
+	CHANNEL_POSITION_TOP_REAR_LEFT,
+	CHANNEL_POSITION_TOP_REAR_RIGHT,
+	CHANNEL_POSITION_TOP_REAR_CENTER,
+
+	CHANNEL_POSITION_MAX
+};
+
+typedef enum channel_position	channel_position_t;
+
+#define CHANNEL_MAP_INIT	{ CHANNEL_POSITION_INVALID }
+
+#define CHANNEL_MAP(name) \
+	channel_position_t name[CHANNELS_MAX] = CHANNEL_MAP_INIT
+
+static inline int channel_map_valid(const channel_position_t *map)
+{
+	return map[0] != CHANNEL_POSITION_INVALID;
+}
+
+static inline int channel_map_equal(const channel_position_t *a, const channel_position_t *b, int channels)
+{
+	return memcmp(a, b, sizeof(*a) * channels) == 0;
+}
+
+static inline channel_position_t *channel_map_copy(channel_position_t *dst, const channel_position_t *src)
+{
+	return memcpy(dst, src, sizeof(*dst) * CHANNELS_MAX);
+}
+
+static inline void channel_map_init_stereo(channel_position_t *map)
+{
+	map[0] = CHANNEL_POSITION_LEFT;
+	map[1] = CHANNEL_POSITION_RIGHT;
+}
+
+void channel_map_init_waveex(int channels, unsigned int mask, channel_position_t *map);
+
+#endif