videoframefactory.cc revision 50b229509187cf63b5c80ff5ae55694f0e84ee23 
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 "talk/media/base/videocapturer.h"
31
32namespace cricket {
33
34VideoFrame* VideoFrameFactory::CreateAliasedFrame(
35    const CapturedFrame* input_frame,
36    int cropped_input_width,
37    int cropped_input_height,
38    int output_width,
39    int output_height) const {
40  rtc::scoped_ptr<VideoFrame> cropped_input_frame(CreateAliasedFrame(
41      input_frame, cropped_input_width, cropped_input_height));
42
43  if (cropped_input_width == output_width &&
44      cropped_input_height == output_height) {
45    // No scaling needed.
46    return cropped_input_frame.release();
47  }
48
49  // Create and stretch the output frame if it has not been created yet, is
50  // still in use by others, or its size is not same as the expected.
51  if (!output_frame_ || !output_frame_->IsExclusive() ||
52      output_frame_->GetWidth() != static_cast<size_t>(output_width) ||
53      output_frame_->GetHeight() != static_cast<size_t>(output_height)) {
54    output_frame_.reset(
55        cropped_input_frame->Stretch(output_width, output_height, true, true));
56    if (!output_frame_) {
57      LOG(LS_WARNING) << "Failed to stretch frame to " << output_width << "x"
58                      << output_height;
59      return NULL;
60    }
61  } else {
62    cropped_input_frame->StretchToFrame(output_frame_.get(), true, true);
63    output_frame_->SetElapsedTime(cropped_input_frame->GetElapsedTime());
64    output_frame_->SetTimeStamp(cropped_input_frame->GetTimeStamp());
65  }
66  return output_frame_->Copy();
67}
68
69}  // namespace cricket
70