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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 #include "talk/media/base/videoframefactory.h"
     29 
     30 #include <algorithm>
     31 #include "talk/media/base/videocapturer.h"
     32 
     33 namespace cricket {
     34 
     35 VideoFrame* VideoFrameFactory::CreateAliasedFrame(
     36     const CapturedFrame* input_frame,
     37     int cropped_input_width,
     38     int cropped_input_height,
     39     int output_width,
     40     int output_height) const {
     41   rtc::scoped_ptr<VideoFrame> cropped_input_frame(CreateAliasedFrame(
     42       input_frame, cropped_input_width, cropped_input_height));
     43   if (!cropped_input_frame)
     44     return nullptr;
     45 
     46   if (cropped_input_width == output_width &&
     47       cropped_input_height == output_height) {
     48     // No scaling needed.
     49     return cropped_input_frame.release();
     50   }
     51 
     52   // If the frame is rotated, we need to switch the width and height.
     53   if (apply_rotation_ &&
     54       (input_frame->rotation == webrtc::kVideoRotation_90 ||
     55        input_frame->rotation == webrtc::kVideoRotation_270)) {
     56     std::swap(output_width, output_height);
     57   }
     58 
     59   // Create and stretch the output frame if it has not been created yet, is
     60   // still in use by others, or its size is not same as the expected.
     61   if (!output_frame_ || !output_frame_->IsExclusive() ||
     62       output_frame_->GetWidth() != static_cast<size_t>(output_width) ||
     63       output_frame_->GetHeight() != static_cast<size_t>(output_height)) {
     64     output_frame_.reset(
     65         cropped_input_frame->Stretch(output_width, output_height, true, true));
     66     if (!output_frame_) {
     67       LOG(LS_WARNING) << "Failed to stretch frame to " << output_width << "x"
     68                       << output_height;
     69       return NULL;
     70     }
     71   } else {
     72     cropped_input_frame->StretchToFrame(output_frame_.get(), true, true);
     73     output_frame_->SetTimeStamp(cropped_input_frame->GetTimeStamp());
     74   }
     75   return output_frame_->Copy();
     76 }
     77 
     78 }  // namespace cricket
     79