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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /third_party/libwebrtc/api/video/video_source_interface.h | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | third_party/libwebrtc/api/video/video_source_interface.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/video/video_source_interface.h b/third_party/libwebrtc/api/video/video_source_interface.h new file mode 100644 index 0000000000..38d0041718 --- /dev/null +++ b/third_party/libwebrtc/api/video/video_source_interface.h @@ -0,0 +1,130 @@ +/* + * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef API_VIDEO_VIDEO_SOURCE_INTERFACE_H_ +#define API_VIDEO_VIDEO_SOURCE_INTERFACE_H_ + +#include <limits> +#include <vector> + +#include "absl/types/optional.h" +#include "api/video/video_sink_interface.h" +#include "rtc_base/system/rtc_export.h" + +namespace rtc { + +// VideoSinkWants is used for notifying the source of properties a video frame +// should have when it is delivered to a certain sink. +struct RTC_EXPORT VideoSinkWants { + struct FrameSize { + FrameSize(int width, int height) : width(width), height(height) {} + FrameSize(const FrameSize&) = default; + ~FrameSize() = default; + + int width; + int height; + }; + + VideoSinkWants(); + VideoSinkWants(const VideoSinkWants&); + ~VideoSinkWants(); + // Tells the source whether the sink wants frames with rotation applied. + // By default, any rotation must be applied by the sink. + bool rotation_applied = false; + + // Tells the source that the sink only wants black frames. + bool black_frames = false; + + // Tells the source the maximum number of pixels the sink wants. + int max_pixel_count = std::numeric_limits<int>::max(); + // Tells the source the desired number of pixels the sinks wants. This will + // typically be used when stepping the resolution up again when conditions + // have improved after an earlier downgrade. The source should select the + // closest resolution to this pixel count, but if max_pixel_count is set, it + // still sets the absolute upper bound. + absl::optional<int> target_pixel_count; + // Tells the source the maximum framerate the sink wants. + int max_framerate_fps = std::numeric_limits<int>::max(); + + // Tells the source that the sink wants width and height of the video frames + // to be divisible by `resolution_alignment`. + // For example: With I420, this value would be a multiple of 2. + // Note that this field is unrelated to any horizontal or vertical stride + // requirements the encoder has on the incoming video frame buffers. + int resolution_alignment = 1; + + // The resolutions that sink is configured to consume. If the sink is an + // encoder this is what the encoder is configured to encode. In singlecast we + // only encode one resolution, but in simulcast and SVC this can mean multiple + // resolutions per frame. + // + // The sink is always configured to consume a subset of the + // webrtc::VideoFrame's resolution. In the case of encoding, we usually encode + // at webrtc::VideoFrame's resolution but this may not always be the case due + // to scaleResolutionDownBy or turning off simulcast or SVC layers. + // + // For example, we may capture at 720p and due to adaptation (e.g. applying + // `max_pixel_count` constraints) create webrtc::VideoFrames of size 480p, but + // if we do scaleResolutionDownBy:2 then the only resolution we end up + // encoding is 240p. In this case we still need to provide webrtc::VideoFrames + // of size 480p but we can optimize internal buffers for 240p, avoiding + // downsampling to 480p if possible. + // + // Note that the `resolutions` can change while frames are in flight and + // should only be used as a hint when constructing the webrtc::VideoFrame. + std::vector<FrameSize> resolutions; + + // This is the resolution requested by the user using RtpEncodingParameters. + absl::optional<FrameSize> requested_resolution; + + // `active` : is (any) of the layers/sink(s) active. + bool is_active = true; + + // This sub-struct contains information computed by VideoBroadcaster + // that aggregates several VideoSinkWants (and sends them to + // AdaptedVideoTrackSource). + struct Aggregates { + // `active_without_requested_resolution` is set by VideoBroadcaster + // when aggregating sink wants if there exists any sink (encoder) that is + // active but has not set the `requested_resolution`, i.e is relying on + // OnOutputFormatRequest to handle encode resolution. + bool any_active_without_requested_resolution = false; + }; + absl::optional<Aggregates> aggregates; +}; + +inline bool operator==(const VideoSinkWants::FrameSize& a, + const VideoSinkWants::FrameSize& b) { + return a.width == b.width && a.height == b.height; +} + +inline bool operator!=(const VideoSinkWants::FrameSize& a, + const VideoSinkWants::FrameSize& b) { + return !(a == b); +} + +template <typename VideoFrameT> +class VideoSourceInterface { + public: + virtual ~VideoSourceInterface() = default; + + virtual void AddOrUpdateSink(VideoSinkInterface<VideoFrameT>* sink, + const VideoSinkWants& wants) = 0; + // RemoveSink must guarantee that at the time the method returns, + // there is no current and no future calls to VideoSinkInterface::OnFrame. + virtual void RemoveSink(VideoSinkInterface<VideoFrameT>* sink) = 0; + + // Request underlying source to capture a new frame. + // TODO(crbug/1255737): make pure virtual once downstream projects adapt. + virtual void RequestRefreshFrame() {} +}; + +} // namespace rtc +#endif // API_VIDEO_VIDEO_SOURCE_INTERFACE_H_ |