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Implement AV1 RtpPacketizer class

Browse Source 
Bug: webrtc:11042
Change-Id: Id1fc0acfa87a4520344f2636f50cb4d4e7284829
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160416
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29947}
This commit is contained in:
Danil Chapovalov
2019-11-28 13:42:50 +01:00
committed by Commit Bot
parent 4314a494cf
commit 096a46f38f
4 changed files with 864 additions and 0 deletions
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4
modules/rtp_rtcp/BUILD.gn
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@ -181,6 +181,8 @@ rtc_library("rtp_rtcp") {
"source/rtp_header_extension_size.h",
"source/rtp_packet_history.cc",
"source/rtp_packet_history.h",
"source/rtp_packetizer_av1.cc",
"source/rtp_packetizer_av1.h",
"source/rtp_rtcp_config.h",
"source/rtp_rtcp_impl.cc",
"source/rtp_rtcp_impl.h",
@ -459,6 +461,7 @@ if (rtc_include_tests) {
"source/rtp_header_extension_size_unittest.cc",
"source/rtp_packet_history_unittest.cc",
"source/rtp_packet_unittest.cc",
"source/rtp_packetizer_av1_unittest.cc",
"source/rtp_rtcp_impl_unittest.cc",
"source/rtp_sender_audio_unittest.cc",
"source/rtp_sender_unittest.cc",
@ -489,6 +492,7 @@ if (rtc_include_tests) {
"../../api/rtc_event_log",
"../../api/transport:field_trial_based_config",
"../../api/units:timestamp",
"../../api/video:encoded_image",
"../../api/video:video_bitrate_allocation",
"../../api/video:video_bitrate_allocator",
"../../api/video:video_codec_constants",

425
modules/rtp_rtcp/source/rtp_packetizer_av1.cc Normal file
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@ -0,0 +1,425 @@
/*
* Copyright (c) 2019 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 "modules/rtp_rtcp/source/rtp_packetizer_av1.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include "api/array_view.h"
#include "api/video/video_frame_type.h"
#include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
#include "rtc_base/byte_buffer.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace {
// TODO(danilchap): Some of the helpers/constants are same as in
// rtp_depacketizer_av1. Move them to common av1 file.
constexpr int kAggregationHeaderSize = 1;
// when there are 3 or less OBU (fragments) in a packet, size of the last one
// can be omited.
constexpr int kMaxNumObusToOmitSize = 3;
constexpr uint8_t kObuSizePresentBit = 0b0'0000'010;
constexpr int kObuTypeSequenceHeader = 1;
constexpr int kObuTypeTemporalDelimiter = 2;
constexpr int kObuTypeTileList = 8;
constexpr int kObuTypePadding = 15;
bool ObuHasExtension(uint8_t obu_header) {
return obu_header & 0b0'0000'100;
}
bool ObuHasSize(uint8_t obu_header) {
return obu_header & kObuSizePresentBit;
}
int ObuType(uint8_t obu_header) {
return (obu_header & 0b0'1111'000) >> 3;
}
int Leb128Size(int value) {
RTC_DCHECK_GE(value, 0);
int size = 0;
while (value >= 0x80) {
++size;
value >>= 7;
}
return size + 1;
}
// Returns number of bytes consumed.
int WriteLeb128(uint32_t value, uint8_t* buffer) {
int size = 0;
while (value >= 0x80) {
buffer[size] = 0x80 | (value & 0x7F);
++size;
value >>= 7;
}
buffer[size] = value;
++size;
return size;
}
// Given |remaining_bytes| free bytes left in a packet, returns max size of an
// OBU fragment that can fit into the packet.
// i.e. MaxFragmentSize + Leb128Size(MaxFragmentSize) <= remaining_bytes.
int MaxFragmentSize(int remaining_bytes) {
if (remaining_bytes <= 1) {
return 0;
}
for (int i = 1;; ++i) {
if (remaining_bytes < (1 << 7 * i) + i) {
return remaining_bytes - i;
}
}
}
} // namespace
RtpPacketizerAv1::RtpPacketizerAv1(rtc::ArrayView<const uint8_t> payload,
RtpPacketizer::PayloadSizeLimits limits,
VideoFrameType frame_type)
: frame_type_(frame_type),
obus_(ParseObus(payload)),
packets_(Packetize(obus_, limits)) {}
std::vector<RtpPacketizerAv1::Obu> RtpPacketizerAv1::ParseObus(
rtc::ArrayView<const uint8_t> payload) {
std::vector<Obu> result;
rtc::ByteBufferReader payload_reader(
reinterpret_cast<const char*>(payload.data()), payload.size());
while (payload_reader.Length() > 0) {
Obu obu;
payload_reader.ReadUInt8(&obu.header);
obu.size = 1;
if (ObuHasExtension(obu.header)) {
if (payload_reader.Length() == 0) {
RTC_DLOG(LS_ERROR) << "Malformed AV1 input: expected extension_header, "
"no more bytes in the buffer. Offset: "
<< (payload.size() - payload_reader.Length());
return {};
}
payload_reader.ReadUInt8(&obu.extension_header);
++obu.size;
}
if (!ObuHasSize(obu.header)) {
obu.payload = rtc::MakeArrayView(
reinterpret_cast<const uint8_t*>(payload_reader.Data()),
payload_reader.Length());
payload_reader.Consume(payload_reader.Length());
} else {
uint64_t size = 0;
if (!payload_reader.ReadUVarint(&size) ||
size > payload_reader.Length()) {
RTC_DLOG(LS_ERROR) << "Malformed AV1 input: declared size " << size
<< " is larger than remaining buffer size "
<< payload_reader.Length();
return {};
}
obu.payload = rtc::MakeArrayView(
reinterpret_cast<const uint8_t*>(payload_reader.Data()), size);
payload_reader.Consume(size);
}
obu.size += obu.payload.size();
// Skip obus that shouldn't be transfered over rtp.
int obu_type = ObuType(obu.header);
if (obu_type != kObuTypeTemporalDelimiter && //
obu_type != kObuTypeTileList && //
obu_type != kObuTypePadding) {
result.push_back(obu);
}
}
return result;
}
int RtpPacketizerAv1::AdditionalBytesForPreviousObuElement(
const Packet& packet) {
if (packet.packet_size == 0) {
// Packet is still empty => no last OBU element, no need to reserve space
// for it.
return 0;
}
if (packet.num_obu_elements > kMaxNumObusToOmitSize) {
// There is so many obu elements in the packet, all of them must be
// prepended with the length field. That imply space for the length of the
// last obu element is already reserved.
return 0;
}
// No space was reserved for length field of the last OBU element, but that
// element becoming non-last, so it now requires explicit length field.
// Calculate how many bytes are needed to store the length in leb128 format.
return Leb128Size(packet.last_obu_size);
}
std::vector<RtpPacketizerAv1::Packet> RtpPacketizerAv1::Packetize(
rtc::ArrayView<const Obu> obus,
PayloadSizeLimits limits) {
std::vector<Packet> packets;
if (obus.empty()) {
return packets;
}
// Ignore certian edge cases where packets should be very small. They are
// inpractical but adds complexity to handle.
if (limits.max_payload_len - limits.last_packet_reduction_len < 3 ||
limits.max_payload_len - limits.first_packet_reduction_len < 3) {
RTC_DLOG(LS_ERROR) << "Failed to packetize AV1 frame: requested packet "
"size is unreasonable small.";
return packets;
}
// Aggregation header is present in all packets.
limits.max_payload_len -= kAggregationHeaderSize;
// Assemble packets. Push to current packet as much as it can hold before
// considering next one. That would normally cause uneven distribution across
// packets, specifically last one would be generally smaller.
packets.emplace_back(/*first_obu_index=*/0);
int packet_remaining_bytes =
limits.max_payload_len - limits.first_packet_reduction_len;
for (size_t obu_index = 0; obu_index < obus.size(); ++obu_index) {
const bool is_last_obu = obu_index == obus.size() - 1;
const Obu& obu = obus[obu_index];
// Putting |obu| into the last packet would make last obu element stored in
// that packet not last. All not last OBU elements must be prepend with the
// element length. AdditionalBytesForPreviousObuElement calculates how many
// bytes are needed to store that length.
int previous_obu_extra_size =
AdditionalBytesForPreviousObuElement(packets.back());
int min_required_size =
packets.back().num_obu_elements >= kMaxNumObusToOmitSize ? 2 : 1;
if (packet_remaining_bytes < previous_obu_extra_size + min_required_size) {
// Start a new packet.
packets.emplace_back(/*first_obu_index=*/obu_index);
packet_remaining_bytes = limits.max_payload_len;
previous_obu_extra_size = 0;
}
Packet& packet = packets.back();
// Start inserting current obu into the packet.
packet.packet_size += previous_obu_extra_size;
packet_remaining_bytes -= previous_obu_extra_size;
packet.num_obu_elements++;
bool must_write_obu_element_size =
packet.num_obu_elements > kMaxNumObusToOmitSize;
// Can fit all of the obu into the packet?
int required_bytes = obu.size;
if (must_write_obu_element_size) {
required_bytes += Leb128Size(obu.size);
}
int available_bytes = packet_remaining_bytes;
if (is_last_obu) {
// If this packet would be the last packet, available size is smaller.
if (packets.size() == 1) {
available_bytes += limits.first_packet_reduction_len;
available_bytes -= limits.single_packet_reduction_len;
} else {
available_bytes -= limits.last_packet_reduction_len;
}
}
if (required_bytes <= available_bytes) {
// Insert the obu into the packet unfragmented.
packet.last_obu_size = obu.size;
packet.packet_size += required_bytes;
packet_remaining_bytes -= required_bytes;
continue;
}
// Fragment the obu.
int max_first_fragment_size = must_write_obu_element_size
? MaxFragmentSize(packet_remaining_bytes)
: packet_remaining_bytes;
// Because available_bytes might be different than
// packet_remaining_bytes it might happen that max_first_fragment_size >=
// obu.size. Also, since checks above verified |obu| should not be put
// completely into the |packet|, leave at least 1 byte for later packet.
int first_fragment_size = std::min(obu.size - 1, max_first_fragment_size);
if (first_fragment_size == 0) {
// Rather than writing 0-size element at the tail of the packet,
// 'uninsert' the |obu| from the |packet|.
packet.num_obu_elements--;
packet.packet_size -= previous_obu_extra_size;
} else {
packet.packet_size += first_fragment_size;
if (must_write_obu_element_size) {
packet.packet_size += Leb128Size(first_fragment_size);
}
packet.last_obu_size = first_fragment_size;
}
// Add middle fragments that occupy all of the packet.
// These are easy because
// - one obu per packet imply no need to store the size of the obu.
// - this packets are nor the first nor the last packets of the frame, so
// packet capacity is always limits.max_payload_len.
int obu_offset;
for (obu_offset = first_fragment_size;
obu_offset + limits.max_payload_len < obu.size;
obu_offset += limits.max_payload_len) {
packets.emplace_back(/*first_obu_index=*/obu_index);
Packet& packet = packets.back();
packet.num_obu_elements = 1;
packet.first_obu_offset = obu_offset;
int middle_fragment_size = limits.max_payload_len;
packet.last_obu_size = middle_fragment_size;
packet.packet_size = middle_fragment_size;
}
// Add the last fragment of the obu.
int last_fragment_size = obu.size - obu_offset;
// Check for corner case where last fragment of the last obu is too large
// to fit into last packet, but may fully fit into semi-last packet.
if (is_last_obu &&
last_fragment_size >
limits.max_payload_len - limits.last_packet_reduction_len) {
// Split last fragments into two.
RTC_DCHECK_GE(last_fragment_size, 2);
// Try to even packet sizes rather than payload sizes across the last
// two packets.
int semi_last_fragment_size =
(last_fragment_size + limits.last_packet_reduction_len) / 2;
// But leave at least one payload byte for the last packet to avoid
// weird scenarios where size of the fragment is zero and rtp payload has
// nothing except for an aggregation header.
if (semi_last_fragment_size >= last_fragment_size) {
semi_last_fragment_size = last_fragment_size - 1;
}
last_fragment_size -= semi_last_fragment_size;
packets.emplace_back(/*first_obu_index=*/obu_index);
Packet& packet = packets.back();
packet.num_obu_elements = 1;
packet.first_obu_offset = obu_offset;
packet.last_obu_size = semi_last_fragment_size;
packet.packet_size = semi_last_fragment_size;
obu_offset += semi_last_fragment_size;
}
packets.emplace_back(/*first_obu_index=*/obu_index);
Packet& last_packet = packets.back();
last_packet.num_obu_elements = 1;
last_packet.first_obu_offset = obu_offset;
last_packet.last_obu_size = last_fragment_size;
last_packet.packet_size = last_fragment_size;
packet_remaining_bytes = limits.max_payload_len - last_fragment_size;
}
return packets;
}
uint8_t RtpPacketizerAv1::AggregationHeader() const {
const Packet& packet = packets_[packet_index_];
uint8_t aggregation_header = 0;
// Set Z flag: first obu element is continuation of the previous OBU.
bool first_obu_element_is_fragment = packet.first_obu_offset > 0;
if (first_obu_element_is_fragment)
aggregation_header |= (1 << 7);
// Set Y flag: last obu element will be continuated in the next packet.
int last_obu_offset =
packet.num_obu_elements == 1 ? packet.first_obu_offset : 0;
bool last_obu_is_fragment =
last_obu_offset + packet.last_obu_size <
obus_[packet.first_obu + packet.num_obu_elements - 1].size;
if (last_obu_is_fragment)
aggregation_header |= (1 << 6);
// Set W field: number of obu elements in the packet (when not too large).
if (packet.num_obu_elements <= kMaxNumObusToOmitSize)
aggregation_header |= packet.num_obu_elements << 4;
// Set N flag: beginning of a new coded video sequence.
// Encoder may produce key frame without a sequence header, thus double check
// incoming frame includes the sequence header. Since Temporal delimiter is
// already filtered out, sequence header should be the first obu when present.
if (frame_type_ == VideoFrameType::kVideoFrameKey && packet_index_ == 0 &&
ObuType(obus_.front().header) == kObuTypeSequenceHeader) {
aggregation_header |= (1 << 3);
}
return aggregation_header;
}
bool RtpPacketizerAv1::NextPacket(RtpPacketToSend* packet) {
if (packet_index_ >= packets_.size()) {
return false;
}
const Packet& next_packet = packets_[packet_index_];
RTC_DCHECK_GT(next_packet.num_obu_elements, 0);
RTC_DCHECK_LT(next_packet.first_obu_offset,
obus_[next_packet.first_obu].size);
RTC_DCHECK_LE(
next_packet.last_obu_size,
obus_[next_packet.first_obu + next_packet.num_obu_elements - 1].size);
uint8_t* const rtp_payload =
packet->AllocatePayload(kAggregationHeaderSize + next_packet.packet_size);
uint8_t* write_at = rtp_payload;
*write_at++ = AggregationHeader();
int obu_offset = next_packet.first_obu_offset;
// Store all OBU elements except the last one.
for (int i = 0; i < next_packet.num_obu_elements - 1; ++i) {
const Obu& obu = obus_[next_packet.first_obu + i];
size_t fragment_size = obu.size - obu_offset;
write_at += WriteLeb128(fragment_size, write_at);
if (obu_offset == 0) {
*write_at++ = obu.header & ~kObuSizePresentBit;
}
if (obu_offset <= 1 && ObuHasExtension(obu.header)) {
*write_at++ = obu.extension_header;
}
int payload_offset =
std::max(0, obu_offset - (ObuHasExtension(obu.header) ? 2 : 1));
size_t payload_size = obu.payload.size() - payload_offset;
memcpy(write_at, obu.payload.data() + payload_offset, payload_size);
write_at += payload_size;
// All obus are stored from the beginning, except, may be, the first one.
obu_offset = 0;
}
// Store the last OBU element.
const Obu& last_obu =
obus_[next_packet.first_obu + next_packet.num_obu_elements - 1];
int fragment_size = next_packet.last_obu_size;
RTC_DCHECK_GT(fragment_size, 0);
if (next_packet.num_obu_elements > kMaxNumObusToOmitSize) {
write_at += WriteLeb128(fragment_size, write_at);
}
if (obu_offset == 0 && fragment_size > 0) {
*write_at++ = last_obu.header & ~kObuSizePresentBit;
--fragment_size;
}
if (obu_offset <= 1 && ObuHasExtension(last_obu.header) &&
fragment_size > 0) {
*write_at++ = last_obu.extension_header;
--fragment_size;
}
RTC_DCHECK_EQ(write_at - rtp_payload + fragment_size,
kAggregationHeaderSize + next_packet.packet_size);
int payload_offset =
std::max(0, obu_offset - (ObuHasExtension(last_obu.header) ? 2 : 1));
memcpy(write_at, last_obu.payload.data() + payload_offset, fragment_size);
write_at += fragment_size;
RTC_DCHECK_EQ(write_at - rtp_payload,
kAggregationHeaderSize + next_packet.packet_size);
++packet_index_;
if (packet_index_ == packets_.size()) {
// TODO(danilchap): To support spatial scalability pass and use information
// if this frame is the last in the temporal unit.
packet->SetMarker(true);
}
return true;
}
} // namespace webrtc

70
modules/rtp_rtcp/source/rtp_packetizer_av1.h Normal file
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@ -0,0 +1,70 @@
/*
* Copyright (c) 2019 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.
*/
#ifndef MODULES_RTP_RTCP_SOURCE_RTP_PACKETIZER_AV1_H_
#define MODULES_RTP_RTCP_SOURCE_RTP_PACKETIZER_AV1_H_
#include <stddef.h>
#include <stdint.h>
#include <vector>
#include "api/array_view.h"
#include "api/video/video_frame_type.h"
#include "modules/rtp_rtcp/source/rtp_format.h"
namespace webrtc {
class RtpPacketizerAv1 : public RtpPacketizer {
public:
RtpPacketizerAv1(rtc::ArrayView<const uint8_t> payload,
PayloadSizeLimits limits,
VideoFrameType frame_type);
~RtpPacketizerAv1() override = default;
size_t NumPackets() const override { return packets_.size() - packet_index_; }
bool NextPacket(RtpPacketToSend* packet) override;
private:
struct Obu {
uint8_t header;
uint8_t extension_header; // undefined if (header & kXbit) == 0
rtc::ArrayView<const uint8_t> payload;
int size; // size of the header and payload combined.
};
struct Packet {
explicit Packet(int first_obu_index) : first_obu(first_obu_index) {}
// Indexes into obus_ vector of the first and last obus that should put into
// the packet.
int first_obu;
int num_obu_elements = 0;
int first_obu_offset = 0;
int last_obu_size;
// Total size consumed by the packet.
int packet_size = 0;
};
// Parses the payload into serie of OBUs.
static std::vector<Obu> ParseObus(rtc::ArrayView<const uint8_t> payload);
// Returns the number of additional bytes needed to store the previous OBU
// element if an additonal OBU element is added to the packet.
static int AdditionalBytesForPreviousObuElement(const Packet& packet);
static std::vector<Packet> Packetize(rtc::ArrayView<const Obu> obus,
PayloadSizeLimits limits);
uint8_t AggregationHeader() const;
const VideoFrameType frame_type_;
const std::vector<Obu> obus_;
const std::vector<Packet> packets_;
size_t packet_index_ = 0;
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_SOURCE_RTP_PACKETIZER_AV1_H_

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modules/rtp_rtcp/source/rtp_packetizer_av1_unittest.cc Normal file
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@ -0,0 +1,365 @@
/*
* Copyright (c) 2019 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 "modules/rtp_rtcp/source/rtp_packetizer_av1.h"
#include <stddef.h>
#include <stdint.h>
#include <initializer_list>
#include <utility>
#include <vector>
#include "api/array_view.h"
#include "api/scoped_refptr.h"
#include "api/video/encoded_image.h"
#include "modules/rtp_rtcp/source/rtp_depacketizer_av1.h"
#include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
#include "test/gmock.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
using ::testing::Each;
using ::testing::ElementsAre;
using ::testing::ElementsAreArray;
using ::testing::Le;
using ::testing::SizeIs;
constexpr uint8_t kNewCodedVideoSequenceBit = 0b00'00'1000;
// All obu types offset by 3 to take correct position in the obu_header.
constexpr uint8_t kObuTypeSequenceHeader = 1 << 3;
constexpr uint8_t kObuTypeTemporalDelimiter = 2 << 3;
constexpr uint8_t kObuTypeFrameHeader = 3 << 3;
constexpr uint8_t kObuTypeTileGroup = 4 << 3;
constexpr uint8_t kObuTypeMetadata = 5 << 3;
constexpr uint8_t kObuTypeFrame = 6 << 3;
constexpr uint8_t kObuTypeTileList = 8 << 3;
constexpr uint8_t kObuExtensionPresentBit = 0b0'0000'100;
constexpr uint8_t kObuSizePresentBit = 0b0'0000'010;
constexpr uint8_t kObuExtensionS1T1 = 0b001'01'000;
// Wrapper around rtp_packet to make it look like container of payload bytes.
struct RtpPayload {
using value_type = rtc::ArrayView<const uint8_t>::value_type;
using const_iterator = rtc::ArrayView<const uint8_t>::const_iterator;
RtpPayload() : rtp_packet(/*extensions=*/nullptr) {}
RtpPayload& operator=(RtpPayload&&) = default;
RtpPayload(RtpPayload&&) = default;
const_iterator begin() const { return rtp_packet.payload().begin(); }
const_iterator end() const { return rtp_packet.payload().end(); }
const uint8_t* data() const { return rtp_packet.payload().data(); }
size_t size() const { return rtp_packet.payload().size(); }
uint8_t aggregation_header() const { return rtp_packet.payload()[0]; }
RtpPacketToSend rtp_packet;
};
// Wrapper around frame pointer to make it look like container of bytes with
// nullptr frame look like empty container.
class Av1Frame {
public:
using value_type = uint8_t;
using const_iterator = const uint8_t*;
explicit Av1Frame(rtc::scoped_refptr<EncodedImageBuffer> frame)
: frame_(std::move(frame)) {}
const_iterator begin() const { return frame_ ? frame_->data() : nullptr; }
const_iterator end() const {
return frame_ ? (frame_->data() + frame_->size()) : nullptr;
}
private:
rtc::scoped_refptr<EncodedImageBuffer> frame_;
};
std::vector<RtpPayload> Packetize(
rtc::ArrayView<const uint8_t> payload,
RtpPacketizer::PayloadSizeLimits limits,
VideoFrameType frame_type = VideoFrameType::kVideoFrameDelta) {
// Run code under test.
RtpPacketizerAv1 packetizer(payload, limits, frame_type);
// Convert result into structure that is easier to run expectation against.
std::vector<RtpPayload> result(packetizer.NumPackets());
for (RtpPayload& rtp_payload : result) {
EXPECT_TRUE(packetizer.NextPacket(&rtp_payload.rtp_packet));
}
return result;
}
Av1Frame ReassembleFrame(rtc::ArrayView<const RtpPayload> rtp_payloads) {
std::vector<rtc::ArrayView<const uint8_t>> payloads(rtp_payloads.size());
for (size_t i = 0; i < rtp_payloads.size(); ++i) {
payloads[i] = rtp_payloads[i];
}
return Av1Frame(RtpDepacketizerAv1::AssembleFrame(payloads));
}
class Obu {
public:
explicit Obu(uint8_t obu_type) : header_(obu_type | kObuSizePresentBit) {
EXPECT_EQ(obu_type & 0b0'1111'000, obu_type);
}
Obu& WithExtension(uint8_t extension) {
extension_ = extension;
header_ |= kObuExtensionPresentBit;
return *this;
}
Obu& WithoutSize() {
header_ &= ~kObuSizePresentBit;
return *this;
}
Obu& WithPayload(std::vector<uint8_t> payload) {
payload_ = std::move(payload);
return *this;
}
private:
friend std::vector<uint8_t> BuildAv1Frame(std::initializer_list<Obu> obus);
uint8_t header_;
uint8_t extension_ = 0;
std::vector<uint8_t> payload_;
};
std::vector<uint8_t> BuildAv1Frame(std::initializer_list<Obu> obus) {
std::vector<uint8_t> raw;
for (const Obu& obu : obus) {
raw.push_back(obu.header_);
if (obu.header_ & kObuExtensionPresentBit) {
raw.push_back(obu.extension_);
}
if (obu.header_ & kObuSizePresentBit) {
// write size in leb128 format.
size_t payload_size = obu.payload_.size();
while (payload_size >= 0x80) {
raw.push_back(0x80 | (payload_size & 0x7F));
payload_size >>= 7;
}
raw.push_back(payload_size);
}
raw.insert(raw.end(), obu.payload_.begin(), obu.payload_.end());
}
return raw;
}
TEST(RtpPacketizerAv1Test, PacketizeOneObuWithoutSizeAndExtension) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeFrame).WithoutSize().WithPayload({1, 2, 3, 4, 5, 6, 7})});
EXPECT_THAT(Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'01'0000, // aggregation header
kObuTypeFrame, 1, 2, 3, 4, 5, 6, 7)));
}
TEST(RtpPacketizerAv1Test, PacketizeOneObuWithoutSizeWithExtension) {
auto kFrame = BuildAv1Frame({Obu(kObuTypeFrame)
.WithoutSize()
.WithExtension(kObuExtensionS1T1)
.WithPayload({2, 3, 4, 5, 6, 7})});
EXPECT_THAT(Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'01'0000, // aggregation header
kObuTypeFrame | kObuExtensionPresentBit,
kObuExtensionS1T1, 2, 3, 4, 5, 6, 7)));
}
TEST(RtpPacketizerAv1Test, RemovesObuSizeFieldWithoutExtension) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeFrame).WithPayload({11, 12, 13, 14, 15, 16, 17})});
EXPECT_THAT(
Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'01'0000, // aggregation header
kObuTypeFrame, 11, 12, 13, 14, 15, 16, 17)));
}
TEST(RtpPacketizerAv1Test, RemovesObuSizeFieldWithExtension) {
auto kFrame = BuildAv1Frame({Obu(kObuTypeFrame)
.WithExtension(kObuExtensionS1T1)
.WithPayload({1, 2, 3, 4, 5, 6, 7})});
EXPECT_THAT(Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'01'0000, // aggregation header
kObuTypeFrame | kObuExtensionPresentBit,
kObuExtensionS1T1, 1, 2, 3, 4, 5, 6, 7)));
}
TEST(RtpPacketizerAv1Test, OmitsSizeForLastObuWhenThreeObusFitsIntoThePacket) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeSequenceHeader).WithPayload({1, 2, 3, 4, 5, 6}),
Obu(kObuTypeMetadata).WithPayload({11, 12, 13, 14}),
Obu(kObuTypeFrame).WithPayload({21, 22, 23, 24, 25, 26})});
EXPECT_THAT(
Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'11'0000, // aggregation header
7, kObuTypeSequenceHeader, 1, 2, 3, 4, 5, 6, //
5, kObuTypeMetadata, 11, 12, 13, 14, //
kObuTypeFrame, 21, 22, 23, 24, 25, 26)));
}
TEST(RtpPacketizerAv1Test, UseSizeForAllObusWhenFourObusFitsIntoThePacket) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeSequenceHeader).WithPayload({1, 2, 3, 4, 5, 6}),
Obu(kObuTypeMetadata).WithPayload({11, 12, 13, 14}),
Obu(kObuTypeFrameHeader).WithPayload({21, 22, 23}),
Obu(kObuTypeTileGroup).WithPayload({31, 32, 33, 34, 35, 36})});
EXPECT_THAT(
Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'00'0000, // aggregation header
7, kObuTypeSequenceHeader, 1, 2, 3, 4, 5, 6, //
5, kObuTypeMetadata, 11, 12, 13, 14, //
4, kObuTypeFrameHeader, 21, 22, 23, //
7, kObuTypeTileGroup, 31, 32, 33, 34, 35, 36)));
}
TEST(RtpPacketizerAv1Test, DiscardsTemporalDelimiterAndTileListObu) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeTemporalDelimiter), Obu(kObuTypeMetadata),
Obu(kObuTypeTileList).WithPayload({1, 2, 3, 4, 5, 6}),
Obu(kObuTypeFrameHeader).WithPayload({21, 22, 23}),
Obu(kObuTypeTileGroup).WithPayload({31, 32, 33, 34, 35, 36})});
EXPECT_THAT(
Packetize(kFrame, {}),
ElementsAre(ElementsAre(0b00'11'0000, // aggregation header
1,
kObuTypeMetadata, //
4, kObuTypeFrameHeader, 21, 22,
23, //
kObuTypeTileGroup, 31, 32, 33, 34, 35, 36)));
}
TEST(RtpPacketizerAv1Test, SplitTwoObusIntoTwoPacketForceSplitObuHeader) {
// Craft expected payloads so that there is only one way to split original
// frame into two packets.
const uint8_t kExpectPayload1[6] = {
0b01'10'0000, // aggregation_header
3,
kObuTypeFrameHeader | kObuExtensionPresentBit,
kObuExtensionS1T1,
21, //
kObuTypeTileGroup | kObuExtensionPresentBit};
const uint8_t kExpectPayload2[6] = {0b10'01'0000, // aggregation_header
kObuExtensionS1T1, 11, 12, 13, 14};
auto kFrame = BuildAv1Frame({Obu(kObuTypeFrameHeader)
.WithExtension(kObuExtensionS1T1)
.WithPayload({21}),
Obu(kObuTypeTileGroup)
.WithExtension(kObuExtensionS1T1)
.WithPayload({11, 12, 13, 14})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 6;
auto payloads = Packetize(kFrame, limits);
EXPECT_THAT(payloads, ElementsAre(ElementsAreArray(kExpectPayload1),
ElementsAreArray(kExpectPayload2)));
}
TEST(RtpPacketizerAv1Test,
SetsNbitAtTheFirstPacketOfAKeyFrameWithSequenceHeader) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeSequenceHeader).WithPayload({1, 2, 3, 4, 5, 6, 7})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 6;
auto packets = Packetize(kFrame, limits, VideoFrameType::kVideoFrameKey);
ASSERT_THAT(packets, SizeIs(2));
EXPECT_TRUE(packets[0].aggregation_header() & kNewCodedVideoSequenceBit);
EXPECT_FALSE(packets[1].aggregation_header() & kNewCodedVideoSequenceBit);
}
TEST(RtpPacketizerAv1Test,
DoesntSetNbitAtThePacketsOfAKeyFrameWithoutSequenceHeader) {
auto kFrame =
BuildAv1Frame({Obu(kObuTypeFrame).WithPayload({1, 2, 3, 4, 5, 6, 7})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 6;
auto packets = Packetize(kFrame, limits, VideoFrameType::kVideoFrameKey);
ASSERT_THAT(packets, SizeIs(2));
EXPECT_FALSE(packets[0].aggregation_header() & kNewCodedVideoSequenceBit);
EXPECT_FALSE(packets[1].aggregation_header() & kNewCodedVideoSequenceBit);
}
TEST(RtpPacketizerAv1Test, DoesntSetNbitAtThePacketsOfADeltaFrame) {
// Even when that delta frame starts with a (redundant) sequence header.
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeSequenceHeader).WithPayload({1, 2, 3, 4, 5, 6, 7})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 6;
auto packets = Packetize(kFrame, limits, VideoFrameType::kVideoFrameDelta);
ASSERT_THAT(packets, SizeIs(2));
EXPECT_FALSE(packets[0].aggregation_header() & kNewCodedVideoSequenceBit);
EXPECT_FALSE(packets[1].aggregation_header() & kNewCodedVideoSequenceBit);
}
// There are multiple valid reasonable ways to split payload into multiple
// packets, do not validate current choice, instead use RtpDepacketizer
// to validate frame is reconstracted to the same one. Note: since
// RtpDepacketizer always inserts obu_size fields in the output, use frame where
// each obu has obu_size fields for more streight forward validation.
TEST(RtpPacketizerAv1Test, SplitSingleObuIntoTwoPackets) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeFrame).WithPayload({11, 12, 13, 14, 15, 16, 17, 18, 19})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 8;
auto payloads = Packetize(kFrame, limits);
EXPECT_THAT(payloads, ElementsAre(SizeIs(Le(8u)), SizeIs(Le(8u))));
// Use RtpDepacketizer to validate the split.
EXPECT_THAT(ReassembleFrame(payloads), ElementsAreArray(kFrame));
}
TEST(RtpPacketizerAv1Test, SplitSingleObuIntoManyPackets) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeFrame).WithPayload(std::vector<uint8_t>(1200, 27))});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 100;
auto payloads = Packetize(kFrame, limits);
EXPECT_THAT(payloads, SizeIs(13u));
EXPECT_THAT(payloads, Each(SizeIs(Le(100u))));
// Use RtpDepacketizer to validate the split.
EXPECT_THAT(ReassembleFrame(payloads), ElementsAreArray(kFrame));
}
TEST(RtpPacketizerAv1Test, SplitTwoObusIntoTwoPackets) {
// 2nd OBU is too large to fit into one packet, so its head would be in the
// same packet as the 1st OBU.
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeSequenceHeader).WithPayload({11, 12}),
Obu(kObuTypeFrame).WithPayload({1, 2, 3, 4, 5, 6, 7, 8, 9})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 8;
auto payloads = Packetize(kFrame, limits);
EXPECT_THAT(payloads, ElementsAre(SizeIs(Le(8u)), SizeIs(Le(8u))));
// Use RtpDepacketizer to validate the split.
EXPECT_THAT(ReassembleFrame(payloads), ElementsAreArray(kFrame));
}
TEST(RtpPacketizerAv1Test,
SplitSingleObuIntoTwoPacketsBecauseOfSinglePacketLimit) {
auto kFrame = BuildAv1Frame(
{Obu(kObuTypeFrame).WithPayload({11, 12, 13, 14, 15, 16, 17, 18, 19})});
RtpPacketizer::PayloadSizeLimits limits;
limits.max_payload_len = 10;
limits.single_packet_reduction_len = 8;
auto payloads = Packetize(kFrame, limits);
EXPECT_THAT(payloads, ElementsAre(SizeIs(Le(10u)), SizeIs(Le(10u))));
EXPECT_THAT(ReassembleFrame(payloads), ElementsAreArray(kFrame));
}
} // namespace
} // namespace webrtc