371 lines
15 KiB
C++
371 lines
15 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef ZLMEDIAKIT_RTCPFCI_H
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#define ZLMEDIAKIT_RTCPFCI_H
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#include "Rtcp.h"
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#include "assert.h"
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namespace mediakit {
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/////////////////////////////////////////// PSFB ////////////////////////////////////////////////////
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//PSFB fmt = 2
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//https://tools.ietf.org/html/rfc4585#section-6.3.2.2
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | First | Number | PictureID |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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//First: 13 bits
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// The macroblock (MB) address of the first lost macroblock. The MB
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// numbering is done such that the macroblock in the upper left
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// corner of the picture is considered macroblock number 1 and the
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// number for each macroblock increases from left to right and then
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// from top to bottom in raster-scan order (such that if there is a
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// total of N macroblocks in a picture, the bottom right macroblock
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// is considered macroblock number N).
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//
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// Number: 13 bits
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// The number of lost macroblocks, in scan order as discussed above.
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//
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// PictureID: 6 bits
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// The six least significant bits of the codec-specific identifier
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// that is used to reference the picture in which the loss of the
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// macroblock(s) has occurred. For many video codecs, the PictureID
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// is identical to the Temporal Reference.
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class FCI_SLI {
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public:
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static size_t constexpr kSize = 4;
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FCI_SLI(uint16_t first, uint16_t number, uint8_t pic_id);
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void check(size_t size);
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uint16_t getFirst() const;
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uint16_t getNumber() const;
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uint8_t getPicID() const;
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string dumpString() const;
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private:
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uint32_t data;
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} PACKED;
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//PSFB fmt = 3
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//https://tools.ietf.org/html/rfc4585#section-6.3.3.2
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | PB |0| Payload Type| Native RPSI bit string |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | defined per codec ... | Padding (0) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_RPSI {
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public:
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//The number of unused bits required to pad the length of the RPSI
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// message to a multiple of 32 bits.
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uint8_t pb;
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#if __BYTE_ORDER == __BIG_ENDIAN
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//0: 1 bit
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// MUST be set to zero upon transmission and ignored upon reception.
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uint8_t zero : 1;
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//Payload Type: 7 bits
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// Indicates the RTP payload type in the context of which the native
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// RPSI bit string MUST be interpreted.
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uint8_t pt : 7;
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#else
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uint8_t pt: 7;
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uint8_t zero: 1;
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#endif
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// Native RPSI bit string: variable length
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// The RPSI information as natively defined by the video codec.
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char bit_string[5];
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//Padding: #PB bits
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// A number of bits set to zero to fill up the contents of the RPSI
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// message to the next 32-bit boundary. The number of padding bits
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// MUST be indicated by the PB field.
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uint8_t padding;
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static size_t constexpr kSize = 8;
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} PACKED;
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//PSFB fmt = 4
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//https://tools.ietf.org/html/rfc5104#section-4.3.1.1
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Seq nr. | Reserved |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_FIR {
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public:
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static size_t constexpr kSize = 8;
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FCI_FIR(uint32_t ssrc, uint8_t seq_number, uint32_t reserved = 0);
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void check(size_t size);
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uint32_t getSSRC() const;
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uint8_t getSeq() const;
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uint32_t getReserved() const;
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string dumpString() const;
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private:
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uint32_t ssrc;
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uint8_t seq_number;
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uint8_t reserved[3];
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} PACKED;
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//PSFB fmt = 5
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//https://tools.ietf.org/html/rfc5104#section-4.3.2.1
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Seq nr. | Reserved | Index |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_TSTR {
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public:
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static size_t constexpr kSize = 8;
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void check(size_t size) {
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CHECK(size == kSize);
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}
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private:
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uint8_t data[kSize];
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} PACKED;
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//PSFB fmt = 6
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//https://tools.ietf.org/html/rfc5104#section-4.3.2.1
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Seq nr. | Reserved | Index |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_TSTN : public FCI_TSTR{
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} PACKED;
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//PSFB fmt = 7
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//https://tools.ietf.org/html/rfc5104#section-4.3.4.1
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//0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Seq nr. |0| Payload Type| Length |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | VBCM Octet String.... | Padding |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_VBCM {
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public:
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static size_t constexpr kSize = 12;
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void check(size_t size) {
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CHECK(size == kSize);
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}
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private:
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uint8_t data[kSize];
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} PACKED;
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//PSFB fmt = 15
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//https://tools.ietf.org/html/draft-alvestrand-rmcat-remb-03
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Unique identifier 'R' 'E' 'M' 'B' |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Num SSRC | BR Exp | BR Mantissa |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC feedback |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ... |
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// Num SSRC (8 bits): Number of SSRCs in this message.
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//
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// BR Exp (6 bits): The exponential scaling of the mantissa for the
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// maximum total media bit rate value, ignoring all packet
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// overhead. The value is an unsigned integer [0..63], as
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// in RFC 5104 section 4.2.2.1.
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//
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// BR Mantissa (18 bits): The mantissa of the maximum total media bit
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// rate (ignoring all packet overhead) that the sender of
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// the REMB estimates. The BR is the estimate of the
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// traveled path for the SSRCs reported in this message.
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// The value is an unsigned integer in number of bits per
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// second.
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//
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// SSRC feedback (32 bits) Consists of one or more SSRC entries which
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// this feedback message applies to.
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class FCI_REMB {
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public:
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static size_t constexpr kSize = 8;
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static string create(const std::vector<uint32_t> &ssrcs, uint32_t bitrate);
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void check(size_t size);
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string dumpString() const;
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uint32_t getBitRate() const;
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vector<uint32_t> getSSRC();
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private:
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//Unique identifier 'R' 'E' 'M' 'B'
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char magic[4];
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//Num SSRC (8 bits)/BR Exp (6 bits)/ BR Mantissa (18 bits)
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uint8_t bitrate[4];
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// SSRC feedback (32 bits) Consists of one or more SSRC entries which
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// this feedback message applies to.
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uint32_t ssrc_feedback[1];
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} PACKED;
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/////////////////////////////////////////// RTPFB ////////////////////////////////////////////////////
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//RTPFB fmt = 1
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//https://tools.ietf.org/html/rfc4585#section-6.2.1
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | PID | BLP |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_NACK {
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public:
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static constexpr size_t kSize = 4;
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FCI_NACK(uint16_t pid_h, const vector<bool> &type);
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void check(size_t size);
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uint16_t getPid() const;
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uint16_t getBlp() const;
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vector<bool> getBitArray() const;
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string dumpString() const;
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private:
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static constexpr size_t kBitSize = 16;
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private:
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// The PID field is used to specify a lost packet. The PID field
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// refers to the RTP sequence number of the lost packet.
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uint16_t pid;
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// bitmask of following lost packets (BLP): 16 bits
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uint16_t blp;
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} PACKED;
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//RTPFB fmt = 3
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//https://tools.ietf.org/html/rfc5104#section-4.2.1.1
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | MxTBR Exp | MxTBR Mantissa |Measured Overhead|
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_TMMBR {
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public:
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static size_t constexpr kSize = 8;
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void check(size_t size) {
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CHECK(size == kSize);
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}
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private:
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//SSRC (32 bits): The SSRC value of the media sender that is
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// requested to obey the new maximum bit rate.
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uint32_t ssrc;
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// MxTBR Exp (6 bits): The exponential scaling of the mantissa for the
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// maximum total media bit rate value. The value is an
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// unsigned integer [0..63].
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// MxTBR Mantissa (17 bits): The mantissa of the maximum total media
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// bit rate value as an unsigned integer.
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// Measured Overhead (9 bits): The measured average packet overhead
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// value in bytes. The measurement SHALL be done according
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// to the description in section 4.2.1.2. The value is an
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// unsigned integer [0..511].
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uint32_t max_tbr;
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} PACKED;
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//RTPFB fmt = 4
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// https://tools.ietf.org/html/rfc5104#section-4.2.2.1
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | MxTBR Exp | MxTBR Mantissa |Measured Overhead|
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_TMMBN : public FCI_TMMBR{
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public:
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} PACKED;
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enum class SymbolStatus : uint8_t{
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//Packet not received
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not_received = 0,
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//Packet received, small delta （所谓small detal是指能用一个字节表示的数值）
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small_delta = 1,
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// Packet received, large ornegative delta （large即是能用两个字节表示的数值）
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large_delta = 2,
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//Reserved
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reserved = 3
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};
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//RTPFB fmt = 15
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//https://tools.ietf.org/html/draft-holmer-rmcat-transport-wide-cc-extensions-01#section-3.1
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//https://zhuanlan.zhihu.com/p/206656654
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | base sequence number | packet status count |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | reference time | fb pkt. count |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | packet chunk | packet chunk |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// . .
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// . .
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | packet chunk | recv delta | recv delta |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// . .
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// . .
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | recv delta | recv delta | zero padding |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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class FCI_TWCC{
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public:
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static size_t constexpr kSize = 8;
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void check(size_t size);
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string dumpString(size_t total_size) const;
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uint16_t getBaseSeq() const;
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uint32_t getReferenceTime() const;
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uint16_t getPacketCount() const;
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map<uint16_t, std::pair<SymbolStatus, uint32_t/*recv delta 微秒*/> > getPacketChunkList(size_t total_size) const;
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private:
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//base sequence number,基础序号,本次反馈的第一个包的序号;也就是RTP扩展头的序列号
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uint16_t base_seq;
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//packet status count, 包个数,本次反馈包含多少个包的状态;从基础序号开始算
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uint16_t pkt_status_count;
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//reference time,基准时间,绝对时间;计算该包中每个媒体包的到达时间都要基于这个基准时间计算
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uint8_t ref_time[3];
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//feedback packet count,反馈包号,本包是第几个transport-cc包，每次加1 |
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uint8_t fb_pkt_count;
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} PACKED;
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} //namespace mediakit
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#endif //ZLMEDIAKIT_RTCPFCI_H
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