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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/rtcp/test_rtcp_packet_builder.h"
#include "base/logging.h"
namespace media {
namespace cast {
TestRtcpPacketBuilder::TestRtcpPacketBuilder()
: ptr_of_length_(NULL),
big_endian_writer_(buffer_, kIpPacketSize) {
}
void TestRtcpPacketBuilder::AddSr(uint32 sender_ssrc,
int number_of_report_blocks) {
AddRtcpHeader(200, number_of_report_blocks);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(kNtpHigh); // NTP timestamp.
big_endian_writer_.WriteU32(kNtpLow);
big_endian_writer_.WriteU32(kRtpTimestamp);
big_endian_writer_.WriteU32(kSendPacketCount);
big_endian_writer_.WriteU32(kSendOctetCount);
}
void TestRtcpPacketBuilder::AddRr(uint32 sender_ssrc,
int number_of_report_blocks) {
AddRtcpHeader(201, number_of_report_blocks);
big_endian_writer_.WriteU32(sender_ssrc);
}
void TestRtcpPacketBuilder::AddRb(uint32 rtp_ssrc) {
big_endian_writer_.WriteU32(rtp_ssrc);
big_endian_writer_.WriteU32(kLoss);
big_endian_writer_.WriteU32(kExtendedMax);
big_endian_writer_.WriteU32(kJitter);
big_endian_writer_.WriteU32(kLastSr);
big_endian_writer_.WriteU32(kDelayLastSr);
}
void TestRtcpPacketBuilder::AddSdesCname(uint32 sender_ssrc,
const std::string& c_name) {
AddRtcpHeader(202, 1);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU8(1); // c_name.
big_endian_writer_.WriteU8(c_name.size()); // c_name length in bytes.
for (size_t i = 0; i < c_name.size(); ++i) {
big_endian_writer_.WriteU8(c_name.c_str()[i]);
}
int padding;
switch (c_name.size() % 4) {
case 0:
padding = 2;
break;
case 1:
padding = 1;
break;
case 2:
padding = 4;
break;
case 3:
padding = 3;
break;
}
for (int j = 0; j < padding; ++j) {
big_endian_writer_.WriteU8(0);
}
}
void TestRtcpPacketBuilder::AddXrHeader(uint32 sender_ssrc) {
AddRtcpHeader(207, 0);
big_endian_writer_.WriteU32(sender_ssrc);
}
void TestRtcpPacketBuilder::AddXrUnknownBlock() {
big_endian_writer_.WriteU8(9); // Block type.
big_endian_writer_.WriteU8(0); // Reserved.
big_endian_writer_.WriteU16(4); // Block length.
// First receiver same as sender of this report.
big_endian_writer_.WriteU32(0);
big_endian_writer_.WriteU32(0);
big_endian_writer_.WriteU32(0);
big_endian_writer_.WriteU32(0);
}
void TestRtcpPacketBuilder::AddXrDlrrBlock(uint32 sender_ssrc) {
big_endian_writer_.WriteU8(5); // Block type.
big_endian_writer_.WriteU8(0); // Reserved.
big_endian_writer_.WriteU16(3); // Block length.
// First receiver same as sender of this report.
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(kLastRr);
big_endian_writer_.WriteU32(kDelayLastRr);
}
void TestRtcpPacketBuilder::AddXrExtendedDlrrBlock(uint32 sender_ssrc) {
big_endian_writer_.WriteU8(5); // Block type.
big_endian_writer_.WriteU8(0); // Reserved.
big_endian_writer_.WriteU16(9); // Block length.
big_endian_writer_.WriteU32(0xaaaaaaaa);
big_endian_writer_.WriteU32(0xaaaaaaaa);
big_endian_writer_.WriteU32(0xaaaaaaaa);
// First receiver same as sender of this report.
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(kLastRr);
big_endian_writer_.WriteU32(kDelayLastRr);
big_endian_writer_.WriteU32(0xbbbbbbbb);
big_endian_writer_.WriteU32(0xbbbbbbbb);
big_endian_writer_.WriteU32(0xbbbbbbbb);
}
void TestRtcpPacketBuilder::AddXrRrtrBlock() {
big_endian_writer_.WriteU8(4); // Block type.
big_endian_writer_.WriteU8(0); // Reserved.
big_endian_writer_.WriteU16(2); // Block length.
big_endian_writer_.WriteU32(kNtpHigh);
big_endian_writer_.WriteU32(kNtpLow);
}
void TestRtcpPacketBuilder::AddNack(uint32 sender_ssrc, uint32 media_ssrc) {
AddRtcpHeader(205, 1);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(media_ssrc);
big_endian_writer_.WriteU16(kMissingPacket);
big_endian_writer_.WriteU16(0);
}
void TestRtcpPacketBuilder::AddSendReportRequest(uint32 sender_ssrc,
uint32 media_ssrc) {
AddRtcpHeader(205, 5);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(media_ssrc);
}
void TestRtcpPacketBuilder::AddPli(uint32 sender_ssrc, uint32 media_ssrc) {
AddRtcpHeader(206, 1);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(media_ssrc);
}
void TestRtcpPacketBuilder::AddRpsi(uint32 sender_ssrc, uint32 media_ssrc) {
AddRtcpHeader(206, 3);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(media_ssrc);
big_endian_writer_.WriteU8(0); // Padding bits.
big_endian_writer_.WriteU8(kPayloadtype);
uint64 picture_id = kPictureId;
for (int i = 9; i > 0; i--) {
big_endian_writer_.WriteU8(
0x80 | static_cast<uint8>(picture_id >> (i * 7)));
}
// Add last byte of picture ID.
big_endian_writer_.WriteU8(static_cast<uint8>(picture_id & 0x7f));
}
void TestRtcpPacketBuilder::AddRemb(uint32 sender_ssrc, uint32 media_ssrc) {
AddRtcpHeader(206, 15);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(0);
big_endian_writer_.WriteU8('R');
big_endian_writer_.WriteU8('E');
big_endian_writer_.WriteU8('M');
big_endian_writer_.WriteU8('B');
big_endian_writer_.WriteU8(1); // Number of SSRCs.
big_endian_writer_.WriteU8(1); // BR Exp.
// BR Mantissa.
big_endian_writer_.WriteU16(static_cast<uint16>(kRembBitrate / 2));
big_endian_writer_.WriteU32(media_ssrc);
}
void TestRtcpPacketBuilder::AddCast(uint32 sender_ssrc, uint32 media_ssrc) {
AddRtcpHeader(206, 15);
big_endian_writer_.WriteU32(sender_ssrc);
big_endian_writer_.WriteU32(media_ssrc);
big_endian_writer_.WriteU8('C');
big_endian_writer_.WriteU8('A');
big_endian_writer_.WriteU8('S');
big_endian_writer_.WriteU8('T');
big_endian_writer_.WriteU8(kAckFrameId);
big_endian_writer_.WriteU8(3); // Loss fields.
big_endian_writer_.WriteU16(0); // Reserved.
big_endian_writer_.WriteU8(kLostFrameId);
big_endian_writer_.WriteU16(kRtcpCastAllPacketsLost);
big_endian_writer_.WriteU8(0); // Lost packet id mask.
big_endian_writer_.WriteU8(kFrameIdWithLostPackets);
big_endian_writer_.WriteU16(kLostPacketId1);
big_endian_writer_.WriteU8(0x2); // Lost packet id mask.
big_endian_writer_.WriteU8(kFrameIdWithLostPackets);
big_endian_writer_.WriteU16(kLostPacketId3);
big_endian_writer_.WriteU8(0); // Lost packet id mask.
}
const uint8* TestRtcpPacketBuilder::Packet() {
PatchLengthField();
return buffer_;
}
void TestRtcpPacketBuilder::PatchLengthField() {
if (ptr_of_length_) {
// Back-patch the packet length. The client must have taken
// care of proper padding to 32-bit words.
int this_packet_length = (big_endian_writer_.ptr() - ptr_of_length_ - 2);
DCHECK_EQ(0, this_packet_length % 4)
<< "Packets must be a multiple of 32 bits long";
*ptr_of_length_ = this_packet_length >> 10;
*(ptr_of_length_ + 1) = (this_packet_length >> 2) & 0xFF;
ptr_of_length_ = NULL;
}
}
// Set the 5-bit value in the 1st byte of the header
// and the payload type. Set aside room for the length field,
// and make provision for back-patching it.
void TestRtcpPacketBuilder::AddRtcpHeader(int payload, int format_or_count) {
PatchLengthField();
big_endian_writer_.WriteU8(0x80 | (format_or_count & 0x1F));
big_endian_writer_.WriteU8(payload);
ptr_of_length_ = big_endian_writer_.ptr();
// Initialize length to "clearly illegal".
big_endian_writer_.WriteU16(0xDEAD);
}
} // namespace cast
} // namespace media
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