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audio/decoders/util.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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 AUDIO_DECODERS_UTIL_H
+#define AUDIO_DECODERS_UTIL_H
+
+#include "common/types.h"
+#include "common/util.h"
+
+namespace Audio {
+
+// Convert one float sample into a int16 sample
+static inline int16 floatToInt16(float src) {
+	return (int16) CLIP<int>((int) floor(src + 0.5), -32768, 32767);
+}
+
+// Convert planar float samples into interleaved int16 samples
+static inline void floatToInt16Interleave(int16 *dst, const float **src,
+										  uint32 length, uint8 channels) {
+	if (channels == 2) {
+		for (uint32 i = 0; i < length; i++) {
+			dst[2 * i    ] = floatToInt16(src[0][i]);
+			dst[2 * i + 1] = floatToInt16(src[1][i]);
+		}
+	} else {
+		for (uint8 c = 0; c < channels; c++)
+			for (uint32 i = 0, j = c; i < length; i++, j += channels)
+				dst[j] = floatToInt16(src[c][i]);
+	}
+}
+
+} // End of namespace Audio
+
+#endif // AUDIO_DECODERS_UTIL_H