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// Copyright 2013 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.
#include "media/cast/rtp_sender/rtp_packetizer/test/rtp_header_parser.h"
#include <cstddef>
#include "net/base/big_endian.h"
namespace media {
namespace cast {
static const uint8 kCastKeyFrameBitMask = 0x80;
static const uint8 kCastReferenceFrameIdBitMask = 0x40;
static const size_t kRtpCommonHeaderLength = 12;
static const size_t kRtpCastHeaderLength = 12;
RtpHeaderParser::RtpHeaderParser(const uint8* rtp_data,
size_t rtp_data_length)
: rtp_data_begin_(rtp_data),
length_(rtp_data_length) {}
RtpHeaderParser::~RtpHeaderParser() {}
bool RtpHeaderParser::Parse(RtpCastHeader* parsed_packet) const {
if (length_ < kRtpCommonHeaderLength + kRtpCastHeaderLength)
return false;
if (!ParseCommon(parsed_packet)) return false;
return ParseCast(parsed_packet);
}
bool RtpHeaderParser::ParseCommon(RtpCastHeader* parsed_packet) const {
const uint8 version = rtp_data_begin_[0] >> 6;
if (version != 2) {
return false;
}
const uint8 num_csrcs = rtp_data_begin_[0] & 0x0f;
const bool marker = ((rtp_data_begin_[1] & 0x80) == 0) ? false : true;
const uint8 payload_type = rtp_data_begin_[1] & 0x7f;
const uint16 sequence_number = (rtp_data_begin_[2] << 8) +
rtp_data_begin_[3];
const uint8* ptr = &rtp_data_begin_[4];
net::BigEndianReader big_endian_reader(ptr, 8);
uint32 rtp_timestamp, ssrc;
big_endian_reader.ReadU32(&rtp_timestamp);
big_endian_reader.ReadU32(&ssrc);
const uint8 csrc_octs = num_csrcs * 4;
parsed_packet->webrtc.header.markerBit = marker;
parsed_packet->webrtc.header.payloadType = payload_type;
parsed_packet->webrtc.header.sequenceNumber = sequence_number;
parsed_packet->webrtc.header.timestamp = rtp_timestamp;
parsed_packet->webrtc.header.ssrc = ssrc;
parsed_packet->webrtc.header.numCSRCs = num_csrcs;
parsed_packet->webrtc.type.Audio.numEnergy =
parsed_packet->webrtc.header.numCSRCs;
parsed_packet->webrtc.header.headerLength = 12 + csrc_octs;
return true;
}
bool RtpHeaderParser::ParseCast(RtpCastHeader* parsed_packet) const {
const uint8* data = rtp_data_begin_ + kRtpCommonHeaderLength;
parsed_packet->is_key_frame = (data[0] & kCastKeyFrameBitMask);
parsed_packet->is_reference = (data[0] & kCastReferenceFrameIdBitMask);
parsed_packet->frame_id = data[1];
net::BigEndianReader big_endian_reader(data + 2, 8);
big_endian_reader.ReadU16(&parsed_packet->packet_id);
big_endian_reader.ReadU16(&parsed_packet->max_packet_id);
if (parsed_packet->is_reference) {
parsed_packet->reference_frame_id = data[6];
}
return true;
}
} // namespace cast
} // namespace media
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