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 "video/config/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 32 // Note: `max_layers` currently only taken into account when using default 33 // scale factors. 34 static int GetAlignmentAndMaybeAdjustScaleFactors( 35 const VideoEncoder::EncoderInfo& info, 36 VideoEncoderConfig* config, 37 absl::optional<size_t> max_layers); 38 }; 39 40 } // namespace webrtc 41 42 #endif // VIDEO_ALIGNMENT_ADJUSTER_H_ 43