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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CAST_STREAMING_SENDER_REPORT_BUILDER_H_
#define CAST_STREAMING_SENDER_REPORT_BUILDER_H_
#include <stdint.h>
#include <utility>
#include "absl/types/span.h"
#include "cast/streaming/rtcp_common.h"
#include "cast/streaming/rtcp_session.h"
#include "cast/streaming/rtp_defines.h"
#include "platform/api/time.h"
namespace openscreen {
namespace cast {
// Builds RTCP packets containing one Sender Report.
class SenderReportBuilder {
public:
explicit SenderReportBuilder(RtcpSession* session);
~SenderReportBuilder();
// Serializes the given |sender_report| as a RTCP packet and writes it to
// |buffer| (which must be kRequiredBufferSize in size). Returns the subspan
// of |buffer| that contains the result and a StatusReportId the receiver
// might use in its own reports to reference this specific report.
std::pair<absl::Span<uint8_t>, StatusReportId> BuildPacket(
const RtcpSenderReport& sender_report,
absl::Span<uint8_t> buffer) const;
// Returns the approximate reference time from a recently-built Sender Report,
// based on the given |report_id| and maximum possible reference time.
Clock::time_point GetRecentReportTime(StatusReportId report_id,
Clock::time_point on_or_before) const;
// The required size (in bytes) of the buffer passed to BuildPacket().
static constexpr int kRequiredBufferSize =
kRtcpCommonHeaderSize + kRtcpSenderReportSize + kRtcpReportBlockSize;
private:
RtcpSession* const session_;
};
} // namespace cast
} // namespace openscreen
#endif // CAST_STREAMING_SENDER_REPORT_BUILDER_H_
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