84a3759825
The current method with max_pixel_count and max_pixel_count_step_up, where only one should be used at a time and this first signaling an inclusive upper bound and other other an exclusive lower bound, makes for a lot of confusion. I've updated this to have a desired target and a maximum instead. The source should select a resolution as close to the target as possible, but no higher than the maximum. I intend to also add similar frame rate settings in an upcoming cl. BUG=webrtc:4172,webrtc:6850 Review-Url: https://codereview.webrtc.org/2672793002 Cr-Commit-Position: refs/heads/master@{#16533}
90 lines
3.8 KiB
C++
90 lines
3.8 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 WEBRTC_MEDIA_BASE_VIDEOADAPTER_H_
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#define WEBRTC_MEDIA_BASE_VIDEOADAPTER_H_
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/base/criticalsection.h"
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#include "webrtc/base/optional.h"
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#include "webrtc/media/base/videocommon.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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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|, but no more than |max_pixel_count|
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// pixels. If |target_pixel_count| is not set, treat it as being equal to
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// |max_pixel_count|. If |max_pixel_count| is not set, treat is as being the
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// highest resolution available.
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void OnResolutionRequest(const rtc::Optional<int>& target_pixel_count,
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const rtc::Optional<int>& max_pixel_count);
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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_ 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_ GUARDED_BY(critical_section_);
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int resolution_request_target_pixel_count_ GUARDED_BY(critical_section_);
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int resolution_request_max_pixel_count_ 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 // WEBRTC_MEDIA_BASE_VIDEOADAPTER_H_
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