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      1 /*
      2  * libjingle
      3  * Copyright 2014 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_MEDIA_BASE_VIDEOFRAMEFACTORY_H_
     29 #define TALK_MEDIA_BASE_VIDEOFRAMEFACTORY_H_
     30 
     31 #include "talk/media/base/videoframe.h"
     32 #include "webrtc/base/scoped_ptr.h"
     33 
     34 namespace cricket {
     35 
     36 struct CapturedFrame;
     37 class VideoFrame;
     38 
     39 // Creates cricket::VideoFrames, or a subclass of cricket::VideoFrame
     40 // depending on the subclass of VideoFrameFactory.
     41 class VideoFrameFactory {
     42  public:
     43   VideoFrameFactory() : apply_rotation_(true) {}
     44   virtual ~VideoFrameFactory() {}
     45 
     46   // The returned frame aliases the aliased_frame if the input color
     47   // space allows for aliasing, otherwise a color conversion will
     48   // occur. Returns NULL if conversion fails.
     49 
     50   // The returned frame will be a center crop of |input_frame| with
     51   // size |cropped_width| x |cropped_height|.
     52   virtual VideoFrame* CreateAliasedFrame(const CapturedFrame* input_frame,
     53                                          int cropped_width,
     54                                          int cropped_height) const = 0;
     55 
     56   // The returned frame will be a center crop of |input_frame| with size
     57   // |cropped_width| x |cropped_height|, scaled to |output_width| x
     58   // |output_height|.
     59   virtual VideoFrame* CreateAliasedFrame(const CapturedFrame* input_frame,
     60                                          int cropped_input_width,
     61                                          int cropped_input_height,
     62                                          int output_width,
     63                                          int output_height) const;
     64 
     65   void SetApplyRotation(bool enable) { apply_rotation_ = enable; }
     66 
     67  protected:
     68   bool apply_rotation_;
     69 
     70  private:
     71   // An internal frame buffer to avoid reallocations. It is mutable because it
     72   // does not affect behaviour, only performance.
     73   mutable rtc::scoped_ptr<VideoFrame> output_frame_;
     74 };
     75 
     76 }  // namespace cricket
     77 
     78 #endif  // TALK_MEDIA_BASE_VIDEOFRAMEFACTORY_H_
     79