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Always unwrap VP9 TL0PicIdx forward if the frame is newer.

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Bug: webrtc:12979
Change-Id: Idcc14f8f61b04f9eb194b55ffa40fb95319a881c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226463
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34513}
This commit is contained in:
philipel 2021-07-19 18:43:34 +02:00 committed by WebRTC LUCI CQ
parent 9f2a20f434
commit dbab1be1d1
3 changed files with 44 additions and 8 deletions
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26
modules/video_coding/rtp_vp9_ref_finder.cc
View File

@ -77,8 +77,21 @@ RtpVp9RefFinder::FrameDecision RtpVp9RefFinder::ManageFrameInternal(
}
GofInfo* info;
int64_t unwrapped_tl0 =
tl0_unwrapper_.Unwrap(codec_header.tl0_pic_idx & 0xFF);
// The VP9 `tl0_pic_idx` is 8 bits and therefor wraps often. In the case of
// packet loss the next received frame could have a `tl0_pic_idx` that looks
// older than the previously received frame. Always wrap forward if |frame| is
// newer in RTP packet sequence number order.
int64_t unwrapped_tl0;
auto tl0_it = gof_info_.rbegin();
if (tl0_it != gof_info_.rend() &&
AheadOf(frame->last_seq_num(), tl0_it->second.last_seq_num)) {
unwrapped_tl0 =
tl0_unwrapper_.UnwrapForward(codec_header.tl0_pic_idx & 0xFF);
} else {
unwrapped_tl0 = tl0_unwrapper_.Unwrap(codec_header.tl0_pic_idx & 0xFF);
}
if (codec_header.ss_data_available) {
if (codec_header.temporal_idx != 0) {
RTC_LOG(LS_WARNING) << "Received scalability structure on a non base "
@ -104,9 +117,9 @@ RtpVp9RefFinder::FrameDecision RtpVp9RefFinder::ManageFrameInternal(
current_ss_idx_ = Add<kMaxGofSaved>(current_ss_idx_, 1);
scalability_structures_[current_ss_idx_] = gof;
scalability_structures_[current_ss_idx_].pid_start = frame->Id();
gof_info_.emplace(
unwrapped_tl0,
GofInfo(&scalability_structures_[current_ss_idx_], frame->Id()));
gof_info_.emplace(unwrapped_tl0,
GofInfo(&scalability_structures_[current_ss_idx_],
frame->Id(), frame->last_seq_num()));
}
const auto gof_info_it = gof_info_.find(unwrapped_tl0);
@ -147,7 +160,8 @@ RtpVp9RefFinder::FrameDecision RtpVp9RefFinder::ManageFrameInternal(
if (codec_header.temporal_idx == 0) {
gof_info_it = gof_info_
.emplace(unwrapped_tl0,
GofInfo(gof_info_it->second.gof, frame->Id()))
GofInfo(gof_info_it->second.gof, frame->Id(),
frame->last_seq_num()))
.first;
}

7
modules/video_coding/rtp_vp9_ref_finder.h
View File

@ -42,10 +42,13 @@ class RtpVp9RefFinder {
enum FrameDecision { kStash, kHandOff, kDrop };
struct GofInfo {
GofInfo(GofInfoVP9* gof, uint16_t last_picture_id)
: gof(gof), last_picture_id(last_picture_id) {}
GofInfo(GofInfoVP9* gof, uint16_t last_picture_id, uint16_t last_seq_num)
: gof(gof),
last_picture_id(last_picture_id),
last_seq_num(last_seq_num) {}
GofInfoVP9* gof;
uint16_t last_picture_id;
uint16_t last_seq_num;
};
FrameDecision ManageFrameInternal(RtpFrameObject* frame);

19
modules/video_coding/rtp_vp9_ref_finder_unittest.cc
View File

@ -23,6 +23,7 @@ using ::testing::Matches;
using ::testing::MatchResultListener;
using ::testing::Pointee;
using ::testing::Property;
using ::testing::SizeIs;
using ::testing::UnorderedElementsAreArray;
namespace webrtc {
@ -661,6 +662,24 @@ TEST_F(RtpVp9RefFinderTest, GofTl0Jump) {
Insert(Frame().Pid(1).SidAndTid(0, 0).Tl0(0).Gof(&ss));
}
TEST_F(RtpVp9RefFinderTest, DontDiscardNewerFramesWithWrappedTl0) {
GofInfoVP9 ss;
ss.SetGofInfoVP9(kTemporalStructureMode1);
Insert(
Frame().Pid(0).SidAndTid(0, 0).Tl0(0).SeqNum(0, 0).AsKeyFrame().Gof(&ss));
// ... 254 frames are lost ...
Insert(Frame()
.Pid(255)
.SidAndTid(0, 0)
.Tl0(255)
.SeqNum(255, 255)
.AsKeyFrame()
.Gof(&ss));
EXPECT_THAT(frames_, SizeIs(2));
}
TEST_F(RtpVp9RefFinderTest, GofTidTooHigh) {
const int kMaxTemporalLayers = 5;
GofInfoVP9 ss;