blob: 94627f23eccef60b68136d53f2dd3b444482d16f [file] [log] [blame]
// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/gpu/vp9_reference_frame_vector.h"
#include "media/gpu/vp9_picture.h"
namespace media {
Vp9ReferenceFrameVector::Vp9ReferenceFrameVector() {
DETACH_FROM_SEQUENCE(sequence_checker_);
}
Vp9ReferenceFrameVector::~Vp9ReferenceFrameVector() {}
// Refresh the reference frame buffer slots with current frame
// based on refresh_frame_flags set in the frame_hdr.
void Vp9ReferenceFrameVector::Refresh(scoped_refptr<VP9Picture> pic) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pic);
const auto& frame_hdr = pic->frame_hdr;
for (size_t i = 0, mask = frame_hdr->refresh_frame_flags; mask;
mask >>= 1, ++i) {
if (mask & 1)
reference_frames_[i] = pic;
}
}
void Vp9ReferenceFrameVector::Clear() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
for (auto& f : reference_frames_)
f = nullptr;
}
// VP9 can maintains up to eight active reference frames and each
// frame can use up to three reference frames from this list.
// GetFrame will return the reference frame placed in reference_frames_[index]
scoped_refptr<VP9Picture> Vp9ReferenceFrameVector::GetFrame(
size_t index) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return reference_frames_[index];
}
} // namespace media