1 /*
2  *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef VIDEO_ALIGNMENT_ADJUSTER_H_
12 #define VIDEO_ALIGNMENT_ADJUSTER_H_
13 
14 #include "api/video_codecs/video_encoder.h"
15 #include "api/video_codecs/video_encoder_config.h"
16 
17 namespace webrtc {
18 
19 class AlignmentAdjuster {
20  public:
21   // Returns the resolution alignment requested by the encoder (i.e
22   // |EncoderInfo::requested_resolution_alignment| which ensures that delivered
23   // frames to the encoder are divisible by this alignment).
24   //
25   // If |EncoderInfo::apply_alignment_to_all_simulcast_layers| is enabled, the
26   // alignment will be adjusted to ensure that each simulcast layer also is
27   // divisible by |requested_resolution_alignment|. The configured scale factors
28   // |scale_resolution_down_by| may be adjusted to a common multiple to limit
29   // the alignment value to avoid largely cropped frames and possibly with an
30   // aspect ratio far from the original.
31   static int GetAlignmentAndMaybeAdjustScaleFactors(
32       const VideoEncoder::EncoderInfo& info,
33       VideoEncoderConfig* config);
34 };
35 
36 }  // namespace webrtc
37 
38 #endif  // VIDEO_ALIGNMENT_ADJUSTER_H_
39