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// Copyright (c) 2010 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 "remoting/protocol/rtp_writer.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "remoting/base/compound_buffer.h"
#include "remoting/protocol/rtp_utils.h"
namespace remoting {
namespace protocol {
namespace {
const uint8 kRtpPayloadTypePrivate = 96;
} // namespace
RtpWriter::RtpWriter()
: last_packet_number_(0) {
}
RtpWriter::~RtpWriter() { }
// Initializes the writer. Must be called on the thread the sockets belong
// to.
void RtpWriter::Init(net::Socket* rtp_socket) {
buffered_rtp_writer_ = new BufferedDatagramWriter();
buffered_rtp_writer_->Init(rtp_socket, NULL);
}
void RtpWriter::SendPacket(uint32 timestamp, bool marker,
const Vp8Descriptor& vp8_descriptor,
const CompoundBuffer& payload) {
RtpHeader header;
header.padding = false;
header.extension = false;
header.sources = 0;
header.marker = marker;
header.payload_type = kRtpPayloadTypePrivate;
header.timestamp = timestamp;
// TODO(sergeyu): RTP requires that SSRC is chosen randomly by each
// participant. There are only two participants in chromoting session,
// so SSRC isn't useful. Implement it in future if neccessary.
header.sync_source_id = 0;
header.sequence_number = last_packet_number_ & 0xFFFF;
++last_packet_number_;
int header_size = GetRtpHeaderSize(header);
int vp8_descriptor_size = GetVp8DescriptorSize(vp8_descriptor);
int payload_size = payload.total_bytes();
int total_size = header_size + vp8_descriptor_size + payload_size;
net::IOBufferWithSize* buffer = new net::IOBufferWithSize(total_size);
// Pack header.
PackRtpHeader(header, reinterpret_cast<uint8*>(buffer->data()),
header_size);
// Pack VP8 descriptor.
PackVp8Descriptor(vp8_descriptor,
reinterpret_cast<uint8*>(buffer->data()) + header_size,
vp8_descriptor_size);
// Copy payload to the buffer.
payload.CopyTo(buffer->data() + header_size + vp8_descriptor_size,
payload_size);
// And write the packet.
buffered_rtp_writer_->Write(buffer, NULL);
}
int RtpWriter::GetPendingPackets() {
return buffered_rtp_writer_->GetBufferChunks();
}
} // namespace protocol
} // namespace remoting
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