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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*
*/
#ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_
#define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_
#include <vector>
#include "webrtc/base/basictypes.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h"
namespace webrtc {
namespace rtcp {
// Slice loss indication (SLI) (RFC 4585).
class Sli : public Psfb {
public:
static const uint8_t kFeedbackMessageType = 2;
class Macroblocks {
public:
static const size_t kLength = 4;
Macroblocks() : item_(0) {}
Macroblocks(uint8_t picture_id, uint16_t first, uint16_t number);
~Macroblocks() {}
void Parse(const uint8_t* buffer);
void Create(uint8_t* buffer) const;
uint16_t first() const { return item_ >> 19; }
uint16_t number() const { return (item_ >> 6) & 0x1fff; }
uint8_t picture_id() const { return (item_ & 0x3f); }
private:
uint32_t item_;
};
Sli() {}
virtual ~Sli() {}
// Parse assumes header is already parsed and validated.
bool Parse(const RTCPUtility::RtcpCommonHeader& header,
const uint8_t* payload); // Size of the payload is in the header.
void WithPictureId(uint8_t picture_id,
uint16_t first_macroblock = 0,
uint16_t number_macroblocks = 0x1fff) {
items_.push_back(
Macroblocks(picture_id, first_macroblock, number_macroblocks));
}
const std::vector<Macroblocks>& macroblocks() const { return items_; }
protected:
bool Create(uint8_t* packet,
size_t* index,
size_t max_length,
RtcpPacket::PacketReadyCallback* callback) const override;
private:
size_t BlockLength() const override {
return RtcpPacket::kHeaderLength + Psfb::kCommonFeedbackLength +
items_.size() * Macroblocks::kLength;
}
std::vector<Macroblocks> items_;
RTC_DISALLOW_COPY_AND_ASSIGN(Sli);
};
} // namespace rtcp
} // namespace webrtc
#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_
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