timestamp_extractor.h

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/*
 * Copyright (c) 2023 Roc Streaming authors
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
//! @file roc_rtp/timestamp_extractor.h
//! @brief Extracts capture timestamp field from packets.
 
#ifndef ROC_RTP_TIMESTAMP_EXTRACTOR_H_
#define ROC_RTP_TIMESTAMP_EXTRACTOR_H_
 
#include "roc_audio/sample_spec.h"
#include "roc_core/attributes.h"
#include "roc_core/noncopyable.h"
#include "roc_core/rate_limiter.h"
#include "roc_core/stddefs.h"
#include "roc_packet/iwriter.h"
#include "roc_packet/packet.h"
 
namespace roc {
namespace rtp {
 
//! Remembers a recent pair of capture timestamp and rtp ts.
class TimestampExtractor : public packet::IWriter, public core::NonCopyable<> {
public:
    //! Initialize.
    TimestampExtractor(packet::IWriter& writer, const audio::SampleSpec& sample_spec);
 
    //! Destroy.
    virtual ~TimestampExtractor();
 
    //! Passes pkt downstream and remembers its capture and rtp timestamps.
    virtual ROC_ATTR_NODISCARD status::StatusCode write(const packet::PacketPtr& pkt);
 
    //! Check if mapping already available.
    bool has_mapping();
 
    //! Get rtp timestamp mapped to given capture timestamp.
    //! @pre
    //!  has_mapping() should return true, otherwise it will panic.
    packet::stream_timestamp_t get_mapping(core::nanoseconds_t capture_ts);
 
private:
    packet::IWriter& writer_;
 
    bool has_ts_;
    core::nanoseconds_t capt_ts_;
    packet::stream_timestamp_t rtp_ts_;
 
    const audio::SampleSpec sample_spec_;
 
    core::RateLimiter rate_limiter_;
};
 
} // namespace rtp
} // namespace roc
 
#endif // ROC_RTP_TIMESTAMP_EXTRACTOR_H_