/* * Copyright (c) 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. */ #include "webrtc/common_video/libyuv/include/scaler.h" #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h" #include "webrtc/modules/video_processing/video_denoiser.h" namespace webrtc { VideoDenoiser::VideoDenoiser(bool runtime_cpu_detection) : width_(0), height_(0), filter_(DenoiserFilter::Create(runtime_cpu_detection)) {} void VideoDenoiser::TrailingReduction(int mb_rows, int mb_cols, const uint8_t* y_src, int stride_y, uint8_t* y_dst) { for (int mb_row = 1; mb_row < mb_rows - 1; ++mb_row) { for (int mb_col = 1; mb_col < mb_cols - 1; ++mb_col) { int mb_index = mb_row * mb_cols + mb_col; uint8_t* mb_dst = y_dst + (mb_row << 4) * stride_y + (mb_col << 4); const uint8_t* mb_src = y_src + (mb_row << 4) * stride_y + (mb_col << 4); // If the number of denoised neighbors is less than a threshold, // do NOT denoise for the block. Set different threshold for skin MB. // The change of denoising status will not propagate. if (metrics_[mb_index].is_skin) { // The threshold is high (more strict) for non-skin MB where the // trailing usually happen. if (metrics_[mb_index].denoise && metrics_[mb_index + 1].denoise + metrics_[mb_index - 1].denoise + metrics_[mb_index + mb_cols].denoise + metrics_[mb_index - mb_cols].denoise <= 2) { metrics_[mb_index].denoise = 0; filter_->CopyMem16x16(mb_src, stride_y, mb_dst, stride_y); } } else if (metrics_[mb_index].denoise && metrics_[mb_index + 1].denoise + metrics_[mb_index - 1].denoise + metrics_[mb_index + mb_cols + 1].denoise + metrics_[mb_index + mb_cols - 1].denoise + metrics_[mb_index - mb_cols + 1].denoise + metrics_[mb_index - mb_cols - 1].denoise + metrics_[mb_index + mb_cols].denoise + metrics_[mb_index - mb_cols].denoise <= 7) { filter_->CopyMem16x16(mb_src, stride_y, mb_dst, stride_y); } } } } void VideoDenoiser::DenoiseFrame(const VideoFrame& frame, VideoFrame* denoised_frame) { int stride_y = frame.stride(kYPlane); int stride_u = frame.stride(kUPlane); int stride_v = frame.stride(kVPlane); // If previous width and height are different from current frame's, then no // denoising for the current frame. if (width_ != frame.width() || height_ != frame.height()) { width_ = frame.width(); height_ = frame.height(); denoised_frame->CreateFrame(frame.buffer(kYPlane), frame.buffer(kUPlane), frame.buffer(kVPlane), width_, height_, stride_y, stride_u, stride_v); // Setting time parameters to the output frame. denoised_frame->set_timestamp(frame.timestamp()); denoised_frame->set_render_time_ms(frame.render_time_ms()); return; } // For 16x16 block. int mb_cols = width_ >> 4; int mb_rows = height_ >> 4; if (metrics_.get() == nullptr) metrics_.reset(new DenoiseMetrics[mb_cols * mb_rows]()); // Denoise on Y plane. uint8_t* y_dst = denoised_frame->buffer(kYPlane); uint8_t* u_dst = denoised_frame->buffer(kUPlane); uint8_t* v_dst = denoised_frame->buffer(kVPlane); const uint8_t* y_src = frame.buffer(kYPlane); const uint8_t* u_src = frame.buffer(kUPlane); const uint8_t* v_src = frame.buffer(kVPlane); // Temporary buffer to store denoising result. uint8_t y_tmp[16 * 16] = {0}; for (int mb_row = 0; mb_row < mb_rows; ++mb_row) { for (int mb_col = 0; mb_col < mb_cols; ++mb_col) { const uint8_t* mb_src = y_src + (mb_row << 4) * stride_y + (mb_col << 4); uint8_t* mb_dst = y_dst + (mb_row << 4) * stride_y + (mb_col << 4); int mb_index = mb_row * mb_cols + mb_col; // Denoise each MB at the very start and save the result to a temporary // buffer. if (filter_->MbDenoise(mb_dst, stride_y, y_tmp, 16, mb_src, stride_y, 0, 1) == FILTER_BLOCK) { uint32_t thr_var = 0; // Save var and sad to the buffer. metrics_[mb_index].var = filter_->Variance16x8( mb_dst, stride_y, y_tmp, 16, &metrics_[mb_index].sad); // Get skin map. metrics_[mb_index].is_skin = MbHasSkinColor( y_src, u_src, v_src, stride_y, stride_u, stride_v, mb_row, mb_col); // Variance threshold for skin/non-skin MB is different. // Skin MB use a small threshold to reduce blockiness. thr_var = metrics_[mb_index].is_skin ? 128 : 12 * 128; if (metrics_[mb_index].var > thr_var) { metrics_[mb_index].denoise = 0; // Use the source MB. filter_->CopyMem16x16(mb_src, stride_y, mb_dst, stride_y); } else { metrics_[mb_index].denoise = 1; // Use the denoised MB. filter_->CopyMem16x16(y_tmp, 16, mb_dst, stride_y); } } else { metrics_[mb_index].denoise = 0; filter_->CopyMem16x16(mb_src, stride_y, mb_dst, stride_y); } // Copy source U/V plane. const uint8_t* mb_src_u = u_src + (mb_row << 3) * stride_u + (mb_col << 3); const uint8_t* mb_src_v = v_src + (mb_row << 3) * stride_v + (mb_col << 3); uint8_t* mb_dst_u = u_dst + (mb_row << 3) * stride_u + (mb_col << 3); uint8_t* mb_dst_v = v_dst + (mb_row << 3) * stride_v + (mb_col << 3); filter_->CopyMem8x8(mb_src_u, stride_u, mb_dst_u, stride_u); filter_->CopyMem8x8(mb_src_v, stride_v, mb_dst_v, stride_v); } } // Second round. // This is to reduce the trailing artifact and blockiness by referring // neighbors' denoising status. TrailingReduction(mb_rows, mb_cols, y_src, stride_y, y_dst); // Setting time parameters to the output frame. denoised_frame->set_timestamp(frame.timestamp()); denoised_frame->set_render_time_ms(frame.render_time_ms()); return; } } // namespace webrtc