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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_ | 11 #ifndef WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_ |
12 #define WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_ | 12 #define WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_ |
13 | 13 |
14 #include "webrtc/media/base/videosinkinterface.h" | 14 #include "webrtc/media/base/videosinkinterface.h" |
15 #include "webrtc/base/optional.h" | 15 #include "webrtc/base/optional.h" |
16 | 16 |
17 namespace rtc { | 17 namespace rtc { |
18 | 18 |
19 // VideoSinkWants is used for notifying the source of properties a video frame | 19 // VideoSinkWants is used for notifying the source of properties a video frame |
20 // should have when it is delivered to a certain sink. | 20 // should have when it is delivered to a certain sink. |
21 struct VideoSinkWants { | 21 struct VideoSinkWants { |
22 // Tells the source whether the sink wants frames with rotation applied. | 22 // Tells the source whether the sink wants frames with rotation applied. |
23 // By default, any rotation must be applied by the sink. | 23 // By default, any rotation must be applied by the sink. |
24 bool rotation_applied = false; | 24 bool rotation_applied = false; |
25 | 25 |
26 // Tells the source that the sink only wants black frames. | 26 // Tells the source that the sink only wants black frames. |
27 bool black_frames = false; | 27 bool black_frames = false; |
28 | 28 |
29 // Tells the source the maximum number of pixels the sink wants. | 29 // Indicates a range some value should be constrained to, such as resolution |
30 rtc::Optional<int> max_pixel_count; | 30 // (pixel count) or frame rate. It is up to the application code to make sure |
31 // |min| <= |target| <= |max|. | |
32 struct ValueRange { | |
33 ValueRange() | |
34 : min(0), target(std::numeric_limits<uint32_t>::max()), max(target) {} | |
35 ValueRange(uint32_t min, uint32_t target, uint32_t max) | |
36 : min(min), target(target), max(max) {} | |
37 | |
38 // |min| = 0, indicates no lower bound. | |
39 uint32_t min; | |
40 // |target| = maxint by default - requesting highest option available. | |
41 uint32_t target; | |
nisse-webrtc
2017/02/17 08:55:21
This makes it impossible to request min and max va
sprang_webrtc
2017/02/20 15:48:35
I think it's reasonable to explicitly define the t
nisse-webrtc
2017/02/20 16:03:47
I think we need to get a second opinion (or third,
sprang_webrtc
2017/02/21 09:11:03
Yes, I think avoid optional entirely in this case
nisse-webrtc
2017/02/21 09:33:59
The original SinkWants cabal were myself, perkj, p
| |
42 // |max| = maxint, indicates to upper bound. | |
43 uint32_t max; | |
44 }; | |
45 | |
31 // Tells the source the desired number of pixels the sinks wants. This will | 46 // Tells the source the desired number of pixels the sinks wants. This will |
32 // typically be used when stepping the resolution up again when conditions | 47 // typically be used when stepping the resolution down or up again as resource |
33 // have improved after an earlier downgrade. The source should select the | 48 // constraints are imposed or lifted. |
34 // closest resolution to this pixel count, but if max_pixel_count is set, it | 49 // |
35 // still sets the absolute upper bound. | 50 // For example, when stepping down resolution on CPU overuse, it's preferable |
36 rtc::Optional<int> target_pixel_count; | 51 // to set the max just below the current resolution but the target to a |
52 // resolution that it is assumed would result in a utilization the system can | |
53 // handle. The source should select a resolution as close to |target| as | |
54 // possible, but no higher than |max|. Then |min| limit can then be set so | |
55 // that user requested minimum resolution bounds aren't violated. | |
56 // | |
57 // Similarly, when stepping up again, the |min| limit can be set one higher | |
58 // than the current resolution, and |target| to something reasonably higher | |
59 // (probably matching the step size down). The |max| limit can be set to | |
60 // avoid too large input. | |
61 rtc::Optional<ValueRange> pixel_count; | |
62 | |
63 // These constraints work in just the same manner as the pixel_count ones, but | |
64 // instead of limiting resolution they limit the framerate. | |
65 rtc::Optional<ValueRange> framerate_fps_; | |
37 }; | 66 }; |
38 | 67 |
39 template <typename VideoFrameT> | 68 template <typename VideoFrameT> |
40 class VideoSourceInterface { | 69 class VideoSourceInterface { |
41 public: | 70 public: |
42 virtual void AddOrUpdateSink(VideoSinkInterface<VideoFrameT>* sink, | 71 virtual void AddOrUpdateSink(VideoSinkInterface<VideoFrameT>* sink, |
43 const VideoSinkWants& wants) = 0; | 72 const VideoSinkWants& wants) = 0; |
44 // RemoveSink must guarantee that at the time the method returns, | 73 // RemoveSink must guarantee that at the time the method returns, |
45 // there is no current and no future calls to VideoSinkInterface::OnFrame. | 74 // there is no current and no future calls to VideoSinkInterface::OnFrame. |
46 virtual void RemoveSink(VideoSinkInterface<VideoFrameT>* sink) = 0; | 75 virtual void RemoveSink(VideoSinkInterface<VideoFrameT>* sink) = 0; |
47 | 76 |
48 protected: | 77 protected: |
49 virtual ~VideoSourceInterface() {} | 78 virtual ~VideoSourceInterface() {} |
50 }; | 79 }; |
51 | 80 |
52 } // namespace rtc | 81 } // namespace rtc |
53 #endif // WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_ | 82 #endif // WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_ |
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