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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
98 lines
4.1 KiB
C++
98 lines
4.1 KiB
C++
/*
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* Copyright (c) 2010 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MEDIA_BASE_VIDEOADAPTER_H_
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#define MEDIA_BASE_VIDEOADAPTER_H_
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#include "api/optional.h"
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#include "media/base/videocommon.h"
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#include "rtc_base/constructormagic.h"
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#include "rtc_base/criticalsection.h"
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namespace cricket {
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// VideoAdapter adapts an input video frame to an output frame based on the
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// specified input and output formats. The adaptation includes dropping frames
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// to reduce frame rate and scaling frames.
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// VideoAdapter is thread safe.
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class VideoAdapter {
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public:
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VideoAdapter();
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// The output frames will have height and width that is divisible by
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// |required_resolution_alignment|.
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explicit VideoAdapter(int required_resolution_alignment);
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virtual ~VideoAdapter();
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// Return the adapted resolution and cropping parameters given the
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// input resolution. The input frame should first be cropped, then
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// scaled to the final output resolution. Returns true if the frame
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// should be adapted, and false if it should be dropped.
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bool AdaptFrameResolution(int in_width,
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int in_height,
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int64_t in_timestamp_ns,
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int* cropped_width,
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int* cropped_height,
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int* out_width,
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int* out_height);
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// Requests the output frame size and frame interval from
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// |AdaptFrameResolution| to not be larger than |format|. Also, the input
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// frame size will be cropped to match the requested aspect ratio. The
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// requested aspect ratio is orientation agnostic and will be adjusted to
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// maintain the input orientation, so it doesn't matter if e.g. 1280x720 or
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// 720x1280 is requested.
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void OnOutputFormatRequest(const VideoFormat& format);
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// Requests the output frame size from |AdaptFrameResolution| to have as close
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// as possible to |target_pixel_count| pixels (if set) but no more than
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// |max_pixel_count|.
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// |max_framerate_fps| is essentially analogous to |max_pixel_count|, but for
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// framerate rather than resolution.
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// Set |max_pixel_count| and/or |max_framerate_fps| to
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// std::numeric_limit<int>::max() if no upper limit is desired.
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void OnResolutionFramerateRequest(
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const rtc::Optional<int>& target_pixel_count,
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int max_pixel_count,
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int max_framerate_fps);
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private:
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// Determine if frame should be dropped based on input fps and requested fps.
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bool KeepFrame(int64_t in_timestamp_ns);
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int frames_in_; // Number of input frames.
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int frames_out_; // Number of output frames.
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int frames_scaled_; // Number of frames scaled.
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int adaption_changes_; // Number of changes in scale factor.
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int previous_width_; // Previous adapter output width.
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int previous_height_; // Previous adapter output height.
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// Resolution must be divisible by this factor.
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const int required_resolution_alignment_;
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// The target timestamp for the next frame based on requested format.
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rtc::Optional<int64_t> next_frame_timestamp_ns_
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RTC_GUARDED_BY(critical_section_);
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// Max number of pixels requested via calls to OnOutputFormatRequest,
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// OnResolutionRequest respectively.
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// The adapted output format is the minimum of these.
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rtc::Optional<VideoFormat> requested_format_
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RTC_GUARDED_BY(critical_section_);
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int resolution_request_target_pixel_count_ RTC_GUARDED_BY(critical_section_);
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int resolution_request_max_pixel_count_ RTC_GUARDED_BY(critical_section_);
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int max_framerate_request_ RTC_GUARDED_BY(critical_section_);
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// The critical section to protect the above variables.
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rtc::CriticalSection critical_section_;
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RTC_DISALLOW_COPY_AND_ASSIGN(VideoAdapter);
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};
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} // namespace cricket
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#endif // MEDIA_BASE_VIDEOADAPTER_H_
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