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In PacketBuffer simplify stored buffer.

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Bug: None
Change-Id: Iddcde9d2ab25d2fb7091c9ed8104138293fd9dee
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168044
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30844}
This commit is contained in:
Danil Chapovalov
2020-03-20 12:30:31 +01:00
committed by Commit Bot
parent ff0451117e
commit f4306ebfea
2 changed files with 52 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

101
modules/video_coding/packet_buffer.cc
View File

@ -96,19 +96,19 @@ PacketBuffer::InsertResult PacketBuffer::InsertPacket(
first_seq_num_ = seq_num;
}
if (buffer_[index].used()) {
if (buffer_[index] != nullptr) {
// Duplicate packet, just delete the payload.
if (buffer_[index].seq_num() == packet->seq_num) {
if (buffer_[index]->seq_num == packet->seq_num) {
return result;
}
// The packet buffer is full, try to expand the buffer.
while (ExpandBufferSize() && buffer_[seq_num % buffer_.size()].used()) {
while (ExpandBufferSize() && buffer_[seq_num % buffer_.size()] != nullptr) {
}
index = seq_num % buffer_.size();
// Packet buffer is still full since we were unable to expand the buffer.
if (buffer_[index].used()) {
if (buffer_[index] != nullptr) {
// Clear the buffer, delete payload, and return false to signal that a
// new keyframe is needed.
RTC_LOG(LS_WARNING) << "Clear PacketBuffer and request key frame.";
@ -126,9 +126,8 @@ PacketBuffer::InsertResult PacketBuffer::InsertPacket(
last_received_keyframe_rtp_timestamp_ = packet->timestamp;
}
StoredPacket& new_entry = buffer_[index];
new_entry.continuous = false;
new_entry.packet = std::move(packet);
packet->continuous = false;
buffer_[index] = std::move(packet);
UpdateMissingPackets(seq_num);
@ -154,9 +153,9 @@ void PacketBuffer::ClearTo(uint16_t seq_num) {
size_t diff = ForwardDiff<uint16_t>(first_seq_num_, seq_num);
size_t iterations = std::min(diff, buffer_.size());
for (size_t i = 0; i < iterations; ++i) {
StoredPacket& stored = buffer_[first_seq_num_ % buffer_.size()];
if (stored.used() && AheadOf<uint16_t>(seq_num, stored.seq_num())) {
stored.packet = nullptr;
auto& stored = buffer_[first_seq_num_ % buffer_.size()];
if (stored != nullptr && AheadOf<uint16_t>(seq_num, stored->seq_num)) {
stored = nullptr;
}
++first_seq_num_;
}
@ -175,8 +174,8 @@ void PacketBuffer::ClearTo(uint16_t seq_num) {
void PacketBuffer::Clear() {
rtc::CritScope lock(&crit_);
for (StoredPacket& entry : buffer_) {
entry.packet = nullptr;
for (auto& entry : buffer_) {
entry = nullptr;
}
first_packet_received_ = false;
@ -213,10 +212,10 @@ bool PacketBuffer::ExpandBufferSize() {
}
size_t new_size = std::min(max_size_, 2 * buffer_.size());
std::vector<StoredPacket> new_buffer(new_size);
for (StoredPacket& entry : buffer_) {
if (entry.used()) {
new_buffer[entry.seq_num() % new_size] = std::move(entry);
std::vector<std::unique_ptr<Packet>> new_buffer(new_size);
for (std::unique_ptr<Packet>& entry : buffer_) {
if (entry != nullptr) {
new_buffer[entry->seq_num % new_size] = std::move(entry);
}
}
buffer_ = std::move(new_buffer);
@ -227,22 +226,22 @@ bool PacketBuffer::ExpandBufferSize() {
bool PacketBuffer::PotentialNewFrame(uint16_t seq_num) const {
size_t index = seq_num % buffer_.size();
int prev_index = index > 0 ? index - 1 : buffer_.size() - 1;
const StoredPacket& entry = buffer_[index];
const StoredPacket& prev_entry = buffer_[prev_index];
const auto& entry = buffer_[index];
const auto& prev_entry = buffer_[prev_index];
if (!entry.used())
if (entry == nullptr)
return false;
if (entry.seq_num() != seq_num)
if (entry->seq_num != seq_num)
return false;
if (entry.frame_begin())
if (entry->is_first_packet_in_frame())
return true;
if (!prev_entry.used())
if (prev_entry == nullptr)
return false;
if (prev_entry.seq_num() != static_cast<uint16_t>(entry.seq_num() - 1))
if (prev_entry->seq_num != static_cast<uint16_t>(entry->seq_num - 1))
return false;
if (prev_entry.packet->timestamp != entry.packet->timestamp)
if (prev_entry->timestamp != entry->timestamp)
return false;
if (prev_entry.continuous)
if (prev_entry->continuous)
return true;
return false;
@ -253,21 +252,21 @@ std::vector<std::unique_ptr<PacketBuffer::Packet>> PacketBuffer::FindFrames(
std::vector<std::unique_ptr<PacketBuffer::Packet>> found_frames;
for (size_t i = 0; i < buffer_.size() && PotentialNewFrame(seq_num); ++i) {
size_t index = seq_num % buffer_.size();
buffer_[index].continuous = true;
buffer_[index]->continuous = true;
// If all packets of the frame is continuous, find the first packet of the
// frame and add all packets of the frame to the returned packets.
if (buffer_[index].frame_end()) {
if (buffer_[index]->is_last_packet_in_frame()) {
uint16_t start_seq_num = seq_num;
// Find the start index by searching backward until the packet with
// the |frame_begin| flag is set.
int start_index = index;
size_t tested_packets = 0;
int64_t frame_timestamp = buffer_[start_index].packet->timestamp;
int64_t frame_timestamp = buffer_[start_index]->timestamp;
// Identify H.264 keyframes by means of SPS, PPS, and IDR.
bool is_h264 = buffer_[start_index].packet->codec() == kVideoCodecH264;
bool is_h264 = buffer_[start_index]->codec() == kVideoCodecH264;
bool has_h264_sps = false;
bool has_h264_pps = false;
bool has_h264_idr = false;
@ -277,12 +276,12 @@ std::vector<std::unique_ptr<PacketBuffer::Packet>> PacketBuffer::FindFrames(
while (true) {
++tested_packets;
if (!is_h264 && buffer_[start_index].frame_begin())
if (!is_h264 && buffer_[start_index]->is_first_packet_in_frame())
break;
if (is_h264) {
const auto* h264_header = absl::get_if<RTPVideoHeaderH264>(
&buffer_[start_index].packet->video_header.video_type_header);
&buffer_[start_index]->video_header.video_type_header);
if (!h264_header || h264_header->nalus_length >= kMaxNalusPerPacket)
return found_frames;
@ -303,10 +302,10 @@ std::vector<std::unique_ptr<PacketBuffer::Packet>> PacketBuffer::FindFrames(
// smallest index and valid resolution; typically its IDR or SPS
// packet; there may be packet preceeding this packet, IDR's
// resolution will be applied to them.
if (buffer_[start_index].packet->width() > 0 &&
buffer_[start_index].packet->height() > 0) {
idr_width = buffer_[start_index].packet->width();
idr_height = buffer_[start_index].packet->height();
if (buffer_[start_index]->width() > 0 &&
buffer_[start_index]->height() > 0) {
idr_width = buffer_[start_index]->width();
idr_height = buffer_[start_index]->height();
}
}
}
@ -322,9 +321,8 @@ std::vector<std::unique_ptr<PacketBuffer::Packet>> PacketBuffer::FindFrames(
// the timestamp of that packet is the same as this one. This may cause
// the PacketBuffer to hand out incomplete frames.
// See: https://bugs.chromium.org/p/webrtc/issues/detail?id=7106
if (is_h264 &&
(!buffer_[start_index].used() ||
buffer_[start_index].packet->timestamp != frame_timestamp)) {
if (is_h264 && (buffer_[start_index] == nullptr ||
buffer_[start_index]->timestamp != frame_timestamp)) {
break;
}
@ -348,26 +346,24 @@ std::vector<std::unique_ptr<PacketBuffer::Packet>> PacketBuffer::FindFrames(
// determines if the RtpFrameObject is a key frame or delta frame.
const size_t first_packet_index = start_seq_num % buffer_.size();
if (is_h264_keyframe) {
buffer_[first_packet_index].packet->video_header.frame_type =
buffer_[first_packet_index]->video_header.frame_type =
VideoFrameType::kVideoFrameKey;
if (idr_width > 0 && idr_height > 0) {
// IDR frame was finalized and we have the correct resolution for
// IDR; update first packet to have same resolution as IDR.
buffer_[first_packet_index].packet->video_header.width = idr_width;
buffer_[first_packet_index].packet->video_header.height =
idr_height;
buffer_[first_packet_index]->video_header.width = idr_width;
buffer_[first_packet_index]->video_header.height = idr_height;
}
} else {
buffer_[first_packet_index].packet->video_header.frame_type =
buffer_[first_packet_index]->video_header.frame_type =
VideoFrameType::kVideoFrameDelta;
}
// With IPPP, if this is not a keyframe, make sure there are no gaps
// in the packet sequence numbers up until this point.
const uint8_t h264tid =
buffer_[start_index].used()
? buffer_[start_index]
.packet->video_header.frame_marking.temporal_id
buffer_[start_index] != nullptr
? buffer_[start_index]->video_header.frame_marking.temporal_id
: kNoTemporalIdx;
if (h264tid == kNoTemporalIdx && !is_h264_keyframe &&
missing_packets_.upper_bound(start_seq_num) !=
@ -381,14 +377,13 @@ std::vector<std::unique_ptr<PacketBuffer::Packet>> PacketBuffer::FindFrames(
uint16_t num_packets = end_seq_num - start_seq_num;
found_frames.reserve(found_frames.size() + num_packets);
for (uint16_t i = start_seq_num; i != end_seq_num; ++i) {
StoredPacket& entry = buffer_[i % buffer_.size()];
RTC_DCHECK(entry.used());
RTC_DCHECK_EQ(i, entry.seq_num());
std::unique_ptr<Packet>& packet = buffer_[i % buffer_.size()];
RTC_DCHECK(packet);
RTC_DCHECK_EQ(i, packet->seq_num);
// Ensure frame boundary flags are properly set.
entry.packet->video_header.is_first_packet_in_frame =
(i == start_seq_num);
entry.packet->video_header.is_last_packet_in_frame = (i == seq_num);
found_frames.push_back(std::move(entry.packet));
packet->video_header.is_first_packet_in_frame = (i == start_seq_num);
packet->video_header.is_last_packet_in_frame = (i == seq_num);
found_frames.push_back(std::move(packet));
}
missing_packets_.erase(missing_packets_.begin(),

23
modules/video_coding/packet_buffer.h
View File

@ -55,6 +55,9 @@ class PacketBuffer {
return video_header.is_last_packet_in_frame;
}
// If all its previous packets have been inserted into the packet buffer.
// Set and used internally by the PacketBuffer.
bool continuous = false;
bool marker_bit = false;
uint8_t payload_type = 0;
uint16_t seq_num = 0;
@ -90,24 +93,6 @@ class PacketBuffer {
absl::optional<int64_t> LastReceivedKeyframePacketMs() const;
private:
struct StoredPacket {
uint16_t seq_num() const { return packet->seq_num; }
// If this is the first packet of the frame.
bool frame_begin() const { return packet->is_first_packet_in_frame(); }
// If this is the last packet of the frame.
bool frame_end() const { return packet->is_last_packet_in_frame(); }
// If this slot is currently used.
bool used() const { return packet != nullptr; }
// If all its previous packets have been inserted into the packet buffer.
bool continuous = false;
std::unique_ptr<Packet> packet;
};
Clock* const clock_;
// Tries to expand the buffer.
@ -141,7 +126,7 @@ class PacketBuffer {
// Buffer that holds the the inserted packets and information needed to
// determine continuity between them.
std::vector<StoredPacket> buffer_ RTC_GUARDED_BY(crit_);
std::vector<std::unique_ptr<Packet>> buffer_ RTC_GUARDED_BY(crit_);
// Timestamp of the last received packet/keyframe packet.
absl::optional<int64_t> last_received_packet_ms_ RTC_GUARDED_BY(crit_);