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channelmap.c

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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/>.
+ */
+
+#include "channelmap.h"
+#include "utils.h"
+
+void channel_map_init_waveex(int channels, unsigned int mask, channel_position_t *map)
+{
+	/* http://www.microsoft.com/whdc/device/audio/multichaud.mspx#EMLAC */
+	const channel_position_t channel_map_waveex[] = {
+		CHANNEL_POSITION_FRONT_LEFT,
+		CHANNEL_POSITION_FRONT_RIGHT,
+		CHANNEL_POSITION_FRONT_CENTER,
+		CHANNEL_POSITION_LFE,
+		CHANNEL_POSITION_REAR_LEFT,
+		CHANNEL_POSITION_REAR_RIGHT,
+		CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
+		CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
+		CHANNEL_POSITION_REAR_CENTER,
+		CHANNEL_POSITION_SIDE_LEFT,
+		CHANNEL_POSITION_SIDE_RIGHT,
+		CHANNEL_POSITION_TOP_CENTER,
+		CHANNEL_POSITION_TOP_FRONT_LEFT,
+		CHANNEL_POSITION_TOP_FRONT_CENTER,
+		CHANNEL_POSITION_TOP_FRONT_RIGHT,
+		CHANNEL_POSITION_TOP_REAR_LEFT,
+		CHANNEL_POSITION_TOP_REAR_CENTER,
+		CHANNEL_POSITION_TOP_REAR_RIGHT
+	};
+
+	if (channels == 1) {
+		map[0] = CHANNEL_POSITION_MONO;
+	} else if (channels > 1 && channels < N_ELEMENTS(channel_map_waveex)) {
+		int i, j = 0;
+
+		if (!mask)
+			mask = (1 << channels) - 1;
+
+		for (i = 0; i < N_ELEMENTS(channel_map_waveex); i++) {
+			if (mask & (1 << i))
+				map[j++] = channel_map_waveex[i];
+		}
+		if (j != channels)
+			map[0] = CHANNEL_POSITION_INVALID;
+	} else {
+		map[0] = CHANNEL_POSITION_INVALID;
+	}
+}