New method CreateScaledFrame in the VideoFrameFactory interface.

webrtc/api/androidvideocapturer.cc

Index: webrtc/api/androidvideocapturer.cc
diff --git a/webrtc/api/androidvideocapturer.cc b/webrtc/api/androidvideocapturer.cc
index ee5ef665d97c37247929f170def89192679220d7..a3eeddd36b5a9ebcdfdc2a8be76334cb71dfda31 100644
--- a/webrtc/api/androidvideocapturer.cc
+++ b/webrtc/api/androidvideocapturer.cc
@@ -64,6 +64,41 @@ class AndroidVideoCapturer::FrameFactory : public cricket::VideoFrameFactory {
     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,