talk/media/base/videoframefactory.cc

// libjingle
// Copyright 2014 Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. The name of the author may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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//

#include "talk/media/base/videoframefactory.h"

#include "talk/media/base/videocapturer.h"

namespace cricket {

VideoFrame* VideoFrameFactory::CreateAliasedFrame(
    const CapturedFrame* input_frame,
    int cropped_input_width,
    int cropped_input_height,
    int output_width,
    int output_height) const {
  rtc::scoped_ptr<VideoFrame> cropped_input_frame(CreateAliasedFrame(
      input_frame, cropped_input_width, cropped_input_height));

  if (cropped_input_width == output_width &&
      cropped_input_height == output_height) {
    // No scaling needed.
    return cropped_input_frame.release();
  }

  // Create and stretch the output frame if it has not been created yet or its
  // size is not same as the expected.
  if (!output_frame_ ||
      output_frame_->GetWidth() != static_cast<size_t>(output_width) ||
      output_frame_->GetHeight() != static_cast<size_t>(output_height)) {
    output_frame_.reset(
        cropped_input_frame->Stretch(output_width, output_height, true, true));
    if (!output_frame_) {
      LOG(LS_WARNING) << "Failed to stretch frame to " << output_width << "x"
                      << output_height;
      return NULL;
    }
  } else {
    cropped_input_frame->StretchToFrame(output_frame_.get(), true, true);
    output_frame_->SetElapsedTime(cropped_input_frame->GetElapsedTime());
    output_frame_->SetTimeStamp(cropped_input_frame->GetTimeStamp());
  }
  return output_frame_->Copy();
}

}  // namespace cricket