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/*
* Copyright (c) 2016 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/audio_coding/neteq/tools/neteq_replacement_input.h"
#include <algorithm>
#include <cstdint>
#include <memory>
#include <optional>
#include <set>
#include <utility>
#include "api/rtp_headers.h"
#include "modules/audio_coding/neteq/tools/fake_decode_from_file.h"
#include "modules/audio_coding/neteq/tools/neteq_input.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace test {
NetEqReplacementInput::NetEqReplacementInput(
std::unique_ptr<NetEqInput> source,
uint8_t replacement_payload_type,
const std::set<uint8_t>& comfort_noise_types,
const std::set<uint8_t>& forbidden_types)
: source_(std::move(source)),
replacement_payload_type_(replacement_payload_type),
comfort_noise_types_(comfort_noise_types),
forbidden_types_(forbidden_types) {
RTC_CHECK(source_);
packet_ = source_->PopPacket();
ReplacePacket();
}
std::optional<int64_t> NetEqReplacementInput::NextPacketTime() const {
return packet_
? std::optional<int64_t>(static_cast<int64_t>(packet_->time_ms))
: std::nullopt;
}
std::optional<int64_t> NetEqReplacementInput::NextOutputEventTime() const {
return source_->NextOutputEventTime();
}
std::optional<NetEqInput::SetMinimumDelayInfo>
NetEqReplacementInput::NextSetMinimumDelayInfo() const {
return source_->NextSetMinimumDelayInfo();
}
std::unique_ptr<NetEqInput::PacketData> NetEqReplacementInput::PopPacket() {
std::unique_ptr<PacketData> to_return = std::move(packet_);
while (true) {
packet_ = source_->PopPacket();
if (!packet_)
break;
if (packet_->payload.size() > packet_->header.paddingLength) {
// Not padding only. Good to go. Skip this packet otherwise.
break;
}
}
ReplacePacket();
return to_return;
}
void NetEqReplacementInput::AdvanceOutputEvent() {
source_->AdvanceOutputEvent();
}
void NetEqReplacementInput::AdvanceSetMinimumDelay() {
source_->AdvanceSetMinimumDelay();
}
bool NetEqReplacementInput::ended() const {
return source_->ended();
}
std::optional<RTPHeader> NetEqReplacementInput::NextHeader() const {
return source_->NextHeader();
}
void NetEqReplacementInput::ReplacePacket() {
if (!source_->NextPacketTime()) {
// End of input. Cannot do proper replacement on the very last packet, so we
// delete it instead.
packet_.reset();
return;
}
RTC_DCHECK(packet_);
RTC_CHECK_EQ(forbidden_types_.count(packet_->header.payloadType), 0)
<< "Payload type " << static_cast<int>(packet_->header.payloadType)
<< " is forbidden.";
// Check if this packet is comfort noise.
if (comfort_noise_types_.count(packet_->header.payloadType) != 0) {
// If CNG, simply insert a zero-energy one-byte payload.
uint8_t cng_payload[1] = {127}; // Max attenuation of CNG.
packet_->payload.SetData(cng_payload);
return;
}
std::optional<RTPHeader> next_hdr = source_->NextHeader();
RTC_DCHECK(next_hdr);
uint8_t payload[12];
constexpr uint32_t kMaxFrameSize = 120 * 48;
const uint32_t timestamp_diff =
next_hdr->timestamp - packet_->header.timestamp;
uint32_t frame_size = last_frame_size_timestamps_;
if (timestamp_diff > 0) {
frame_size = std::min(frame_size, timestamp_diff);
}
const bool opus_dtx = packet_->payload.size() <= 2;
if (next_hdr->sequenceNumber == packet_->header.sequenceNumber + 1 &&
timestamp_diff <= kMaxFrameSize && timestamp_diff > 0 && !opus_dtx) {
// Packets are in order and the timestamp diff is valid.
frame_size = timestamp_diff;
last_frame_size_timestamps_ = frame_size;
}
RTC_DCHECK_LE(frame_size, kMaxFrameSize);
RTC_DCHECK_GT(frame_size, 0);
FakeDecodeFromFile::PrepareEncoded(packet_->header.timestamp, frame_size,
packet_->payload.size(), payload);
packet_->payload.SetData(payload);
packet_->header.payloadType = replacement_payload_type_;
return;
}
} // namespace test
} // namespace webrtc
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