blob: 2971f686b12e4ae72c1fe3d71efe82bccfff358a [file] [log] [blame]
* Copyright (c) 2020 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 <deque>
#include <map>
#include <memory>
#include <set>
#include "absl/container/inlined_vector.h"
#include "modules/video_coding/frame_object.h"
#include "modules/video_coding/rtp_frame_reference_finder.h"
#include "rtc_base/numerics/sequence_number_util.h"
namespace webrtc {
class RtpVp9RefFinder {
RtpVp9RefFinder() = default;
RtpFrameReferenceFinder::ReturnVector ManageFrame(
std::unique_ptr<RtpFrameObject> frame);
void ClearTo(uint16_t seq_num);
static constexpr int kFrameIdLength = 1 << 15;
static constexpr int kMaxGofSaved = 50;
static constexpr int kMaxLayerInfo = 50;
static constexpr int kMaxNotYetReceivedFrames = 100;
static constexpr int kMaxStashedFrames = 100;
static constexpr int kMaxTemporalLayers = 5;
enum FrameDecision { kStash, kHandOff, kDrop };
struct GofInfo {
GofInfo(GofInfoVP9* gof, uint16_t last_picture_id)
: gof(gof), last_picture_id(last_picture_id) {}
GofInfoVP9* gof;
uint16_t last_picture_id;
struct UnwrappedTl0Frame {
int64_t unwrapped_tl0;
std::unique_ptr<RtpFrameObject> frame;
FrameDecision ManageFrameFlexible(RtpFrameObject* frame,
const RTPVideoHeaderVP9& vp9_header);
FrameDecision ManageFrameGof(RtpFrameObject* frame,
const RTPVideoHeaderVP9& vp9_header,
int64_t unwrapped_tl0);
void RetryStashedFrames(RtpFrameReferenceFinder::ReturnVector& res);
bool MissingRequiredFrameVp9(uint16_t picture_id, const GofInfo& info);
void FrameReceivedVp9(uint16_t picture_id, GofInfo* info);
bool UpSwitchInIntervalVp9(uint16_t picture_id,
uint8_t temporal_idx,
uint16_t pid_ref);
void FlattenFrameIdAndRefs(RtpFrameObject* frame, bool inter_layer_predicted);
// Frames that have been fully received but didn't have all the information
// needed to determine their references.
std::deque<UnwrappedTl0Frame> stashed_frames_;
// Where the current scalability structure is in the
// `scalability_structures_` array.
uint8_t current_ss_idx_ = 0;
// Holds received scalability structures.
std::array<GofInfoVP9, kMaxGofSaved> scalability_structures_;
// Holds the the Gof information for a given unwrapped TL0 picture index.
std::map<int64_t, GofInfo> gof_info_;
// Keep track of which picture id and which temporal layer that had the
// up switch flag set.
std::map<uint16_t, uint8_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>
// For every temporal layer, keep a set of which frames that are missing.
std::array<std::set<uint16_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>,
// Unwrapper used to unwrap VP8/VP9 streams which have their picture id
// specified.
SeqNumUnwrapper<uint16_t, kFrameIdLength> unwrapper_;
SeqNumUnwrapper<uint8_t> tl0_unwrapper_;
} // namespace webrtc