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