添加rtcp fci相关代码

src/Rtcp/RtcpFCI.cpp

@@ -9,9 +9,137 @@
  */
 
 
+#include "assert.h"
 #include "RtcpFCI.h"
+#define CHECK(exp) Assert_Throw(!(exp), #exp, __FUNCTION__, __FILE__, __LINE__);
 
 namespace mediakit {
 
+FCI_SLI::FCI_SLI(uint16_t first, uint16_t number, uint8_t pic_id) {
+    //13 bits
+    first &= 0x1FFF;
+    //13 bits
+    number &= 0x1FFF;
+    //6 bits
+    pic_id &= 0x3F;
+    data = (first << 19) | (number << 6) | pic_id;
+    data = htonl(data);
+}
+
+uint16_t FCI_SLI::getFirst() const {
+    return data >> 19;
+}
+
+uint16_t FCI_SLI::getNumber() const {
+    return (data >> 6) & 0x1FFF;
+}
+
+uint8_t FCI_SLI::getPicID() const {
+    return data & 0x3F;
+}
+
+void FCI_SLI::net2Host() {
+    data = ntohl(data);
+}
+
+string FCI_SLI::dumpString() const {
+    return StrPrinter << "First:" << getFirst() << ", Number:" << getNumber() << ", PictureID:" << (int)getPicID();
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void FCI_FIR::net2Host() {
+    ssrc = ntohl(ssrc);
+    reserved = ntohl(reserved) >> 8;
+}
+
+string FCI_FIR::dumpString() const {
+    return StrPrinter << "ssrc:" << ssrc << ", seq_number:" << seq_number << ", reserved:" << reserved;
+}
+
+FCI_FIR::FCI_FIR(uint32_t ssrc, uint8_t seq_number, uint32_t reserved) {
+    this->ssrc = htonl(ssrc);
+    this->seq_number = seq_number;
+    this->reserved = htonl(reserved) >> 8;
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+string FCI_REMB::create(const initializer_list<uint32_t> &ssrcs, uint32_t bitrate) {
+    CHECK(ssrcs.size() > 0 && ssrcs.size() <= 0xFF);
+    string ret;
+    ret.resize(kSize + ssrcs.size() * 4);
+    FCI_REMB *thiz = (FCI_REMB *) ret.data();
+    memcpy(thiz->magic, "REMB", 4);
+
+    /* bitrate --> BR Exp/BR Mantissa */
+    uint8_t b = 0;
+    uint8_t exp = 0;
+    uint32_t mantissa = 0;
+    for (b = 0; b < 32; b++) {
+        if (bitrate <= ((uint32_t) 0x3FFFF << b)) {
+            exp = b;
+            break;
+        }
+    }
+    if (b > 31) {
+        b = 31;
+    }
+    mantissa = bitrate >> b;
+    //Num SSRC (8 bits)
+    thiz->bitrate[0] = ssrcs.size() & 0xFF;
+    //BR Exp (6 bits)/BR Mantissa (18 bits)
+    thiz->bitrate[1] = (uint8_t) ((exp << 2) + ((mantissa >> 16) & 0x03));
+    //BR Mantissa (18 bits)
+    thiz->bitrate[2] = (uint8_t) (mantissa >> 8);
+    //BR Mantissa (18 bits)
+    thiz->bitrate[3] = (uint8_t) (mantissa);
+
+    //设置ssrc列表
+    auto ptr = thiz->ssrc_feedback;
+    for (auto &ssrc : ssrcs) {
+        *(ptr++) = htonl(ssrc);
+    }
+    return ret;
+}
+
+void FCI_REMB::net2Host(size_t total_size) {
+    CHECK(total_size >= kSize);
+    CHECK(memcmp(magic, "REMB", 4) == 0);
+    auto num_ssrc = bitrate[0];
+    auto expect_size = kSize + 4 * num_ssrc;
+    CHECK(total_size == expect_size);
+    auto ptr = ssrc_feedback;
+    while (num_ssrc--) {
+        *(ptr++) = ntohl(*ptr);
+    }
+}
+
+uint32_t FCI_REMB::getBitRate() const {
+    uint8_t exp = (bitrate[1] >> 2) & 0x3F;
+    uint32_t mantissa = (bitrate[1] & 0x03) << 16;
+    mantissa += (bitrate[2] << 8);
+    mantissa += (bitrate[3]);
+    return mantissa << exp;
+}
+
+vector<uint32_t *> FCI_REMB::getSSRC() {
+    vector<uint32_t *> ret;
+    auto num_ssrc = bitrate[0];
+    auto ptr = ssrc_feedback;
+    while (num_ssrc--) {
+        ret.emplace_back(ptr++);
+    }
+    return ret;
+}
+
+string FCI_REMB::dumpString() const {
+    _StrPrinter printer;
+    printer << "bitrate:" << getBitRate() << ", ssrc:";
+    for (auto &ssrc : ((FCI_REMB *) this)->getSSRC()) {
+        printer << *ssrc << " ";
+    }
+    return printer;
+}
 
 }//namespace mediakit

src/Rtcp/RtcpFCI.h

@@ -24,11 +24,36 @@ namespace mediakit {
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //   |            First        |        Number           | PictureID |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//First: 13 bits
+//      The macroblock (MB) address of the first lost macroblock.  The MB
+//      numbering is done such that the macroblock in the upper left
+//      corner of the picture is considered macroblock number 1 and the
+//      number for each macroblock increases from left to right and then
+//      from top to bottom in raster-scan order (such that if there is a
+//      total of N macroblocks in a picture, the bottom right macroblock
+//      is considered macroblock number N).
+//
+//   Number: 13 bits
+//      The number of lost macroblocks, in scan order as discussed above.
+//
+//   PictureID: 6 bits
+//      The six least significant bits of the codec-specific identifier
+//      that is used to reference the picture in which the loss of the
+//      macroblock(s) has occurred.  For many video codecs, the PictureID
+//      is identical to the Temporal Reference.
 class FCI_SLI {
 public:
-    uint32_t first : 13;
+    static size_t constexpr kSize = 4;
-    uint32_t number : 13;
+
-    uint32_t pic_id  : 6;
+    FCI_SLI(uint16_t first, uint16_t number, uint8_t pic_id);
+    uint16_t getFirst() const;
+    uint16_t getNumber() const;
+    uint8_t getPicID() const;
+    void net2Host();
+    string dumpString() const;
+
+private:
+    uint32_t data;
 } PACKED;
 
 //PSFB fmt = 3
@@ -61,12 +86,15 @@ public:
 
     // Native RPSI bit string: variable length
     //      The RPSI information as natively defined by the video codec.
-    char str[1];
+    char bit_string[5];
 
     //Padding: #PB bits
     //      A number of bits set to zero to fill up the contents of the RPSI
     //      message to the next 32-bit boundary.  The number of padding bits
     //      MUST be indicated by the PB field.
+    uint8_t padding;
+
+    static size_t constexpr kSize = 8;
 } PACKED;
 
 //PSFB fmt = 4
@@ -79,6 +107,15 @@ public:
 //   | Seq nr.       |    Reserved                                   |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 class FCI_FIR {
+public:
+    uint32_t ssrc;
+    uint32_t seq_number: 8;
+    uint32_t reserved: 24;
+
+    static size_t constexpr kSize = 8;
+    FCI_FIR(uint32_t ssrc, uint8_t seq_number, uint32_t reserved = 0);
+    void net2Host();
+    string dumpString() const;
 
 } PACKED;
 
@@ -92,7 +129,8 @@ class FCI_FIR {
 //   |  Seq nr.      |  Reserved                           | Index   |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 class FCI_TSTR {
-
+public:
+    static size_t constexpr kSize = 8;
 } PACKED;
 
 //PSFB fmt = 6
@@ -104,7 +142,7 @@ class FCI_TSTR {
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //   |  Seq nr.      |  Reserved                           | Index   |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-class FCI_TSTN {
+class FCI_TSTN : public FCI_TSTR{
 
 } PACKED;
 
@@ -120,7 +158,8 @@ class FCI_TSTN {
 //   |                    VBCM Octet String....      |    Padding    |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 class FCI_VBCM {
-
+public:
+    static size_t constexpr kSize = 12;
 } PACKED;
 
 //PSFB fmt = 15
@@ -128,12 +167,6 @@ class FCI_VBCM {
 //    0                   1                   2                   3
 //    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
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//   |V=2|P| FMT=15  |   PT=206      |             length            |
-//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//   |                  SSRC of packet sender                        |
-//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//   |                  SSRC of media source                         |
-//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //   |  Unique identifier 'R' 'E' 'M' 'B'                            |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //   |  Num SSRC     | BR Exp    |  BR Mantissa                      |
@@ -141,31 +174,39 @@ class FCI_VBCM {
 //   |   SSRC feedback                                               |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //   |  ...                                                          |
+// Num SSRC (8 bits):  Number of SSRCs in this message.
+//
+//   BR Exp (6 bits):   The exponential scaling of the mantissa for the
+//               maximum total media bit rate value, ignoring all packet
+//               overhead.  The value is an unsigned integer [0..63], as
+//               in RFC 5104 section 4.2.2.1.
+//
+//   BR Mantissa (18 bits):   The mantissa of the maximum total media bit
+//               rate (ignoring all packet overhead) that the sender of
+//               the REMB estimates.  The BR is the estimate of the
+//               traveled path for the SSRCs reported in this message.
+//               The value is an unsigned integer in number of bits per
+//               second.
+//
+//   SSRC feedback (32 bits)  Consists of one or more SSRC entries which
+//               this feedback message applies to.
 class FCI_REMB {
 public:
+    static size_t constexpr kSize = 8;
+
+    static string create(const std::initializer_list<uint32_t> &ssrcs, uint32_t bitrate);
+    void net2Host(size_t total_size);
+    string dumpString() const;
+    uint32_t getBitRate() const;
+    vector<uint32_t *> getSSRC();
+
     //Unique identifier 'R' 'E' 'M' 'B'
     char magic[4];
-
+    //Num SSRC (8 bits)/BR Exp (6 bits)/ BR Mantissa (18 bits)
-    //Number of SSRCs in this message.
+    uint8_t bitrate[4];
-    uint32_t num_ssrc : 8;
-
-    // BR Exp (6 bits):   The exponential scaling of the mantissa for the
-    //               maximum total media bit rate value, ignoring all packet
-    //               overhead.  The value is an unsigned integer [0..63], as
-    //               in RFC 5104 section 4.2.2.1.
-    uint32_t br_exp : 6;
-
-    //BR Mantissa (18 bits):   The mantissa of the maximum total media bit
-    //               rate (ignoring all packet overhead) that the sender of
-    //               the REMB estimates.  The BR is the estimate of the
-    //               traveled path for the SSRCs reported in this message.
-    //               The value is an unsigned integer in number of bits per
-    //               second.
-    uint32_t br_mantissa : 18;
-
     // SSRC feedback (32 bits)  Consists of one or more SSRC entries which
     //               this feedback message applies to.
-    uint32_t ssrc_feedback;
+    uint32_t ssrc_feedback[1];
 
 } PACKED;
 
@@ -254,7 +295,7 @@ public:
 //       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //       |           recv delta          |  recv delta   | zero padding  |
 //       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-class FCI_TWCC : public FCI_TMMBR{
+class FCI_TWCC{
 public:
 
 } PACKED;

tests/test_rtcp_fci.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2016 The ZLToolKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLToolKit(https://github.com/xia-chu/ZLToolKit).
+ *
+ * Use of this source code is governed by MIT license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <iostream>
+#include "Util/logger.h"
+#include "Rtcp/RtcpFCI.h"
+using namespace std;
+using namespace toolkit;
+using namespace mediakit;
+
+int main() {
+    //初始化日志系统
+    Logger::Instance().add(std::make_shared<ConsoleChannel> ());
+
+    {
+        FCI_SLI fci(0xFFFF, 0, 0xFF);
+        InfoL << 0b10101010101 << " " << 0b01010101010 << " " << (int) 0b101010 << " " << hexdump(&fci, FCI_SLI::kSize);
+        fci.net2Host();
+        InfoL << fci.dumpString();
+    }
+    {
+        FCI_FIR fci(123456, 139, 456789);
+        InfoL << hexdump(&fci, FCI_FIR::kSize);
+        fci.net2Host();
+        InfoL << fci.dumpString();
+    }
+    {
+        auto str = FCI_REMB::create({1234,2345,5678}, 4 * 1024 * 1024);
+        FCI_REMB *ptr = (FCI_REMB *)str.data();
+        ptr->net2Host(str.size());
+        InfoL << ptr->dumpString();
+    }
+    return 0;
+}