| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_VIDEO_HALF_FLOAT_MAKER_H_ |
| #define MEDIA_VIDEO_HALF_FLOAT_MAKER_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <memory> |
| |
| #include "media/base/media_export.h" |
| |
| namespace media { |
| |
| class MEDIA_EXPORT HalfFloatMaker { |
| public: |
| virtual ~HalfFloatMaker(); |
| |
| // Convert an array of short integers into an array of half-floats. |
| // |src| is an array of integers in range 0 .. 2^{bits_per_channel} - 1 |
| // |num| is number of entries in input and output array. |
| // The numbers stored in |dst| will be half floats in range 0.0..1.0 |
| virtual void MakeHalfFloats(const uint16_t* src, |
| size_t num, |
| uint16_t* dst) = 0; |
| // The half-floats made needs by this class will be in the range |
| // [Offset() .. Offset() + 1.0/Multiplier]. So if you want results |
| // in the 0-1 range, you need to do: |
| // (half_float - Offset()) * Multiplier() |
| // to each returned value. |
| virtual float Offset() const = 0; |
| virtual float Multiplier() const = 0; |
| // Below is a factory method which can be used to create halffloatmaker. |
| static std::unique_ptr<HalfFloatMaker> NewHalfFloatMaker( |
| int bits_per_channel); |
| }; |
| |
| } // namespace media |
| #endif // MEDIA_VIDEO_HALF_FLOAT_MAKER_H_ |