| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_AUDIO_SAMPLE_H |
| #define ANDROID_AUDIO_SAMPLE_H |
| |
| #include <stdint.h> |
| #include <sys/cdefs.h> |
| |
| __BEGIN_DECLS |
| |
| /* A single signed sample expressed as minifloat, in linear range |
| * -2.0f < x < 2.0f |
| * normalized precision about 4 decimal digits, and dynamic range of approximately -104 dB to +6 dB. |
| * Representation has 13 significand bits (1 sign, 12 mantissa, 1 hidden) and 3 exponent bits. |
| * There is no signed zero because of lack of hardware support for efficient comparisons, |
| * no infinity, and no NaN. |
| */ |
| typedef int16_t sample_minifloat_t; |
| sample_minifloat_t sample_from_float(float f); |
| float float_from_sample(sample_minifloat_t sample); |
| |
| __END_DECLS |
| |
| #endif // ANDROID_AUDIO_SAMPLE_H |
