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