| commit | 5a8724564c2245603ba59edf8d6d2736d0efa0ce | [log] [tgz] |
|---|---|---|
| author | magjed <magjed@webrtc.org> | Thu Oct 20 10:34:29 2016 |
| committer | Commit bot <commit-bot@chromium.org> | Thu Oct 20 10:34:32 2016 |
| tree | fc26ffa4aa3c0ab8ef3066f2342b6d7a81519179 | |
| parent | 7a973447eb147e60f2184bc42f7a878a1e087f0e [diff] |
iOS: Optimize video scaling and cropping This CL makes scaling and cropping lazy in AVFoundationVideoCapturer and provides optimized paths for SW and HW encoding. For SW encoding, an efficient NV12 -> I420 cropping and scaling is implemented in CoreVideoFrameBuffer::NativeToI420. For HW encoding, an efficient NV12 -> NV12 cropping and scaling is implemented in CoreVideoFrameBuffer::CropAndScaleTo. The performance improvement over the existing cropping and scaling is that it is now done in one step instead of making an intermediary copy of the Y plane. There might still be room for improvement in the HW path using some HW support. That will be explored in a future CL. BUG=b/30939444 Review-Url: https://codereview.webrtc.org/2394483005 Cr-Commit-Position: refs/heads/master@{#14701}
WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.
Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.
The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others. This page is maintained by the Google Chrome team.
See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.