util.h

/* 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