New method CreateScaledFrame in the VideoFrameFactory interface.

webrtc/api/androidvideocapturer.cc

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 46 matching lines @@
     buffer_ = nullptr;
     captured_frame_.width = 0;
     captured_frame_.height = 0;
     captured_frame_.time_stamp = 0;
   }
 
   const cricket::CapturedFrame* GetCapturedFrame() const {
     return &captured_frame_;
   }
 
+  std::unique_ptr<cricket::VideoFrame> CreateScaledCroppedFrame(
+      const cricket::CapturedFrame* input_frame,
+    int crop_x,
+    int crop_y,
+    int crop_width,
+    int crop_height,
+    int dst_width,
+    int dst_height) const {
+    // Check that input_frame is actually our frame.
+    RTC_CHECK(input_frame == &captured_frame_);
+    RTC_CHECK(buffer_->native_handle() == nullptr);
+
+    rtc::scoped_refptr<VideoFrameBuffer> scaled_buffer;
+    if (dst_width == crop_width && dst_height == crop_height) {
+      if (dst_width == buffer_->width() && dst_height == buffer_->height()) {
+        scaled_buffer = buffer_;
+      } else {
+        scaled_buffer = WrappedI420Buffer::ShallowCrop(
+            buffer_, crop_x, crop_y, dst_width, dst_height);
+      }
+    }
+    else {
+      scaled_buffer = I420Buffer::CropAndScale(
+          buffer_, crop_x, crop_y, crop_width, crop_height,
+          dst_width, dst_height);
+    }
+    std::unique_ptr<cricket::VideoFrame> frame(
+        new cricket::WebRtcVideoFrame(scaled_buffer,
+                                      input_frame->time_stamp,
+                                      input_frame->rotation));
+    return apply_rotation_ ? std::unique_ptr<cricket::VideoFrame>(
+        frame->GetCopyWithRotationApplied()->Copy())
+        : std::move(frame);
+  }
+
   cricket::VideoFrame* CreateAliasedFrame(
       const cricket::CapturedFrame* captured_frame,
       int dst_width,
       int dst_height) const override {
     // Check that captured_frame is actually our frame.
     RTC_CHECK(captured_frame == &captured_frame_);
     RTC_CHECK(buffer_->native_handle() == nullptr);
 
     std::unique_ptr<cricket::VideoFrame> frame(new cricket::WebRtcVideoFrame(
         ShallowCenterCrop(buffer_, dst_width, dst_height),
@@ skipping 121 matching lines @@
 
 bool AndroidVideoCapturer::GetBestCaptureFormat(
     const cricket::VideoFormat& desired,
     cricket::VideoFormat* best_format) {
   // Delegate this choice to VideoCapturer.startCapture().
   *best_format = desired;
   return true;
 }
 
 }  // namespace webrtc