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StreamConsumer.h
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1 /*
2 * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of NVIDIA CORPORATION nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef STREAM_CONSUMER_H
30 #define STREAM_CONSUMER_H
31
32 #include <EGL/egl.h>
33 #include <EGL/eglext.h>
34
35 namespace ArgusSamples
36 {
37
38 /**
39 * The stream consumer is connecting to a EGL stream and consumes the frames into a GL texture.
40 */
41 class StreamConsumer
42 {
43 public:
44 explicit StreamConsumer(EGLStreamKHR eglStream);
45 ~StreamConsumer();
46
47 bool initialize();
48 bool shutdown();
49
50 bool isEGLStream(EGLStreamKHR eglStream) const;
51 uint32_t getStreamTextureID() const;
52
53 bool setStreamAspectRatio(float aspectRatio);
54 float getStreamAspectRatio() const;
55
56 /**
57 * @returns the cached stream state
58 */
59 EGLint getStreamState() const
60 {
61 return m_streamState;
62 }
63
64 /**
65 * Check the stream state and acquire a new frame if available
66 *
67 * @param acquiredNewFrame [out] set to true if a new frame had been acquired
68 */
69 bool acquire(bool *acquiredNewFrame);
70
71 private:
72 bool m_initialized;
73 EGLStreamKHR m_eglStream;
74 EGLint m_streamState; ///< cached stream state
75 uint32_t m_streamTexture;
76 float m_aspectRatio; ///< aspect ration of the images transported by the stream
77
78 /**
79 * Hide default constructor
80 */
81 StreamConsumer();
82 };
83
84 }; // namespace ArgusSamples
85
86 #endif // STREAM_CONSUMER_H