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// Copyright 2014 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 MEDIA_CAST_NET_RTP_RTP_PARSER_H_
#define MEDIA_CAST_NET_RTP_RTP_PARSER_H_
#include <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "media/cast/net/cast_transport_defines.h"
#include "media/cast/net/rtp/rtp_defines.h"
namespace media {
namespace cast {
// TODO(miu): RtpParser and RtpPacketizer should be consolidated into a single
// module that handles all RTP/Cast packet serialization and deserialization
// throughout the media/cast library.
class RtpParser {
public:
RtpParser(uint32_t expected_sender_ssrc, uint8_t expected_payload_type);
RtpParser(const RtpParser&) = delete;
RtpParser& operator=(const RtpParser&) = delete;
virtual ~RtpParser();
// Parses the |packet|, expecting an RTP header along with a Cast header at
// the beginning of the the RTP payload. This method populates the structure
// pointed to by |rtp_header| and sets the |payload_data| pointer and
// |payload_size| to the memory region within |packet| containing the Cast
// payload data. Returns false if the data appears to be invalid, is not from
// the expected sender (as identified by the SSRC field), or is not the
// expected payload type.
bool ParsePacket(const uint8_t* packet,
size_t length,
RtpCastHeader* rtp_header,
const uint8_t** payload_data,
size_t* payload_size);
static bool ParseSsrc(const uint8_t* packet, size_t length, uint32_t* ssrc);
private:
const uint32_t expected_sender_ssrc_;
const uint8_t expected_payload_type_;
// Tracks recently-parsed values so that the truncated values can be
// re-expanded into full-form.
RtpTimeTicks last_parsed_rtp_timestamp_;
FrameId last_parsed_frame_id_;
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_NET_RTP_RTP_PARSER_H_
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