/*
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* Copyright (c) 2011 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_MODULES_VIDEO_PROCESSING_INCLUDE_VIDEO_PROCESSING_H_
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#define WEBRTC_MODULES_VIDEO_PROCESSING_INCLUDE_VIDEO_PROCESSING_H_
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#include "webrtc/modules/include/module_common_types.h"
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#include "webrtc/modules/video_processing/include/video_processing_defines.h"
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#include "webrtc/video_frame.h"
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// The module is largely intended to process video streams, except functionality
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// provided by static functions which operate independent of previous frames. It
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// is recommended, but not required that a unique instance be used for each
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// concurrently processed stream. Similarly, it is recommended to call Reset()
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// before switching to a new stream, but this is not absolutely required.
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//
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// The module provides basic thread safety by permitting only a single function
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// to execute concurrently.
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namespace webrtc {
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class VideoProcessing {
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public:
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struct FrameStats {
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uint32_t hist[256]; // Frame histogram.
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uint32_t mean;
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uint32_t sum;
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uint32_t num_pixels;
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uint32_t sub_sampling_factor; // Sub-sampling factor, in powers of 2.
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};
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enum BrightnessWarning { kNoWarning, kDarkWarning, kBrightWarning };
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static VideoProcessing* Create();
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virtual ~VideoProcessing() {}
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// Retrieves statistics for the input frame. This function must be used to
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// prepare a FrameStats struct for use in certain VPM functions.
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static void GetFrameStats(const VideoFrame& frame, FrameStats* stats);
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// Checks the validity of a FrameStats struct. Currently, valid implies only
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// that is had changed from its initialized state.
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static bool ValidFrameStats(const FrameStats& stats);
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static void ClearFrameStats(FrameStats* stats);
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// Increases/decreases the luminance value. 'delta' can be in the range {}
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static void Brighten(int delta, VideoFrame* frame);
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// Detects and removes camera flicker from a video stream. Every frame from
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// the stream must be passed in. A frame will only be altered if flicker has
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// been detected. Has a fixed-point implementation.
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// Frame statistics provided by GetFrameStats(). On return the stats will
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// be reset to zero if the frame was altered. Call GetFrameStats() again
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// if the statistics for the altered frame are required.
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virtual int32_t Deflickering(VideoFrame* frame, FrameStats* stats) = 0;
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// Detects if a video frame is excessively bright or dark. Returns a
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// warning if this is the case. Multiple frames should be passed in before
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// expecting a warning. Has a floating-point implementation.
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virtual int32_t BrightnessDetection(const VideoFrame& frame,
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const FrameStats& stats) = 0;
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// The following functions refer to the pre-processor unit within VPM. The
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// pre-processor perfoms spatial/temporal decimation and content analysis on
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// the frames prior to encoding.
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// Enable/disable temporal decimation
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virtual void EnableTemporalDecimation(bool enable) = 0;
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virtual int32_t SetTargetResolution(uint32_t width,
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uint32_t height,
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uint32_t frame_rate) = 0;
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virtual void SetTargetFramerate(int frame_rate) = 0;
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virtual uint32_t GetDecimatedFrameRate() = 0;
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virtual uint32_t GetDecimatedWidth() const = 0;
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virtual uint32_t GetDecimatedHeight() const = 0;
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// Set the spatial resampling settings of the VPM according to
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// VideoFrameResampling.
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virtual void SetInputFrameResampleMode(
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VideoFrameResampling resampling_mode) = 0;
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virtual void EnableDenosing(bool enable) = 0;
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virtual const VideoFrame* PreprocessFrame(const VideoFrame& frame) = 0;
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virtual VideoContentMetrics* GetContentMetrics() const = 0;
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virtual void EnableContentAnalysis(bool enable) = 0;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_VIDEO_PROCESSING_INCLUDE_VIDEO_PROCESSING_H_
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