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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. | |
4 | |
5 #ifndef MEDIA_VIDEO_HALF_FLOAT_MAKER_H_ | |
6 #define MEDIA_VIDEO_HALF_FLOAT_MAKER_H_ | |
7 | |
8 #include <stddef.h> | |
9 #include <stdint.h> | |
10 #include <memory> | |
11 | |
12 #include "media/base/media_export.h" | |
13 | |
14 namespace media { | |
15 | |
16 class MEDIA_EXPORT HalfFloatMaker { | |
17 public: | |
18 // Convert an array of short integers into an array of half-floats. | |
19 // |src| is an array of integers in range 0 .. 2^{bits_per_channel} - 1 | |
20 // |num| is number of entries in input and output array. | |
21 // The numbers stored in |dst| will be half floats in range 0.0..1.0 | |
22 virtual void MakeHalfFloats(const uint16_t* src, | |
23 size_t num, | |
24 uint16_t* dst) = 0; | |
25 // The half-floats made needs by this class will be in the range | |
26 // [Offset() .. Offset() + 1.0/Multiplier]. So if you want results | |
27 // in the 0-1 range, you need to do: | |
28 // (half_float - Offset()) * Multiplier() | |
29 // to each returned value. | |
30 virtual float Offset() const = 0; | |
31 virtual float Multiplier() const = 0; | |
32 static std::unique_ptr<HalfFloatMaker> NewHalfFloatMaker( | |
hubbe
2017/03/23 17:46:11
Please add a comment.
Might also want to add a com
Uzair
2017/03/24 05:39:08
Done.
| |
33 int bits_per_channel); | |
34 }; | |
35 | |
36 } // namespace media | |
37 #endif // MEDIA_VIDEO_HALF_FLOAT_MAKER_H_ | |
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