149 lines
5.9 KiB
C++
149 lines
5.9 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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//https://tools.ietf.org/html/rfc4585
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namespace mediakit {
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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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//
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// Figure 4: Syntax for the Generic NACK message
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class FCI_NACK {
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public:
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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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//https://tools.ietf.org/html/rfc4585#section-6.3.2.2
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// The Slice Loss Indication uses one additional FCI field, the content
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// of which is depicted in Figure 6. The length of the FB message MUST
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// be set to 2+n, with n being the number of SLIs contained in the FCI
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// field.
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//
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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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//
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// Figure 6: Syntax of the Slice Loss Indication (SLI)
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//
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class FCI_SLI {
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public:
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uint32_t first : 13;
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uint32_t number : 13;
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uint32_t pic_id : 6;
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} PACKED;
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//https://tools.ietf.org/html/rfc4585#section-6.3.3.2
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//6.3.3.2. Format
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//
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// The FCI for the RPSI message follows the format depicted in Figure 7:
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//
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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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//
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// Figure 7: Syntax of the Reference Picture Selection Indication (RPSI)
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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 str[1];
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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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} PACKED;
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//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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// |V=2|P| FMT=15 | PT=206 | length |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC of packet sender |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC of media source |
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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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class FCI_REMB {
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public:
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//Unique identifier 'R' 'E' 'M' 'B'
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char magic[4];
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//Number of SSRCs in this message.
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uint32_t num_ssrc : 8;
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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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uint32_t br_exp : 6;
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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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uint32_t br_mantissa : 18;
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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;
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} PACKED;
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} //namespace mediakit
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#endif //ZLMEDIAKIT_RTCPFCI_H
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