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/*
* Copyright 2024 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 "common_video/corruption_detection_converters.h"
#include <optional>
#include <vector>
#include "api/transport/rtp/corruption_detection_message.h"
#include "common_video/frame_instrumentation_data.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
int GetFullSequenceIndex(int previous_sequence_index,
int sequence_index_update,
bool update_the_most_significant_bits) {
RTC_CHECK_GE(previous_sequence_index, 0)
<< "previous_sequence_index must not be negative";
RTC_CHECK_LE(previous_sequence_index, 0x7FFF)
<< "previous_sequence_index must be at most 15 bits";
RTC_CHECK_GE(sequence_index_update, 0)
<< "sequence_index_update must not be negative";
RTC_CHECK_LE(sequence_index_update, 0b0111'1111)
<< "sequence_index_update must be at most 7 bits";
if (update_the_most_significant_bits) {
// Reset LSB.
return sequence_index_update << 7;
}
int upper_bits = previous_sequence_index & 0b0011'1111'1000'0000;
if (sequence_index_update < (previous_sequence_index & 0b0111'1111)) {
// Assume one and only one wraparound has happened.
upper_bits += 0b1000'0000;
}
// Replace the lowest bits with the bits from the update.
return upper_bits + sequence_index_update;
}
int GetSequenceIndexForMessage(int sequence_index,
bool communicate_upper_bits) {
return communicate_upper_bits ? (sequence_index >> 7)
: (sequence_index & 0b0111'1111);
}
} // namespace
std::optional<FrameInstrumentationData>
ConvertCorruptionDetectionMessageToFrameInstrumentationData(
const CorruptionDetectionMessage& message,
int previous_sequence_index) {
if (previous_sequence_index < 0) {
return std::nullopt;
}
if (message.sample_values().empty()) {
return std::nullopt;
}
int full_sequence_index = GetFullSequenceIndex(
previous_sequence_index, message.sequence_index(),
message.interpret_sequence_index_as_most_significant_bits());
std::vector<double> sample_values(message.sample_values().cbegin(),
message.sample_values().cend());
return FrameInstrumentationData{
.sequence_index = full_sequence_index,
.communicate_upper_bits =
message.interpret_sequence_index_as_most_significant_bits(),
.std_dev = message.std_dev(),
.luma_error_threshold = message.luma_error_threshold(),
.chroma_error_threshold = message.chroma_error_threshold(),
.sample_values = sample_values};
}
std::optional<FrameInstrumentationSyncData>
ConvertCorruptionDetectionMessageToFrameInstrumentationSyncData(
const CorruptionDetectionMessage& message,
int previous_sequence_index) {
if (previous_sequence_index < 0) {
return std::nullopt;
}
if (!message.sample_values().empty()) {
return std::nullopt;
}
if (!message.interpret_sequence_index_as_most_significant_bits()) {
return std::nullopt;
}
return FrameInstrumentationSyncData{
.sequence_index = GetFullSequenceIndex(
previous_sequence_index, message.sequence_index(),
/*update_the_most_significant_bits=*/true),
.communicate_upper_bits = true};
}
std::optional<CorruptionDetectionMessage>
ConvertFrameInstrumentationDataToCorruptionDetectionMessage(
const FrameInstrumentationData& data) {
if (data.sequence_index < 0 || data.sequence_index > 0b0011'1111'1111'1111) {
return std::nullopt;
}
// Frame instrumentation data must have sample values.
if (data.sample_values.empty()) {
return std::nullopt;
}
return CorruptionDetectionMessage::Builder()
.WithSequenceIndex(GetSequenceIndexForMessage(
data.sequence_index, data.communicate_upper_bits))
.WithInterpretSequenceIndexAsMostSignificantBits(
data.communicate_upper_bits)
.WithStdDev(data.std_dev)
.WithLumaErrorThreshold(data.luma_error_threshold)
.WithChromaErrorThreshold(data.chroma_error_threshold)
.WithSampleValues(data.sample_values)
.Build();
}
std::optional<CorruptionDetectionMessage>
ConvertFrameInstrumentationSyncDataToCorruptionDetectionMessage(
const FrameInstrumentationSyncData& data) {
RTC_DCHECK(data.communicate_upper_bits)
<< "FrameInstrumentationSyncData data must always send the upper bits.";
if (data.sequence_index < 0 || data.sequence_index > 0b0011'1111'1111'1111) {
return std::nullopt;
}
return CorruptionDetectionMessage::Builder()
.WithSequenceIndex(GetSequenceIndexForMessage(
data.sequence_index, data.communicate_upper_bits))
.WithInterpretSequenceIndexAsMostSignificantBits(true)
.Build();
}
} // namespace webrtc
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