{"id":5727,"date":"2026-05-20T12:00:00","date_gmt":"2026-05-20T03:00:00","guid":{"rendered":"https:\/\/www.freelifemakers.org\/wordpress\/?p=5727"},"modified":"2026-05-20T13:42:34","modified_gmt":"2026-05-20T04:42:34","slug":"mediaserver-mini_mediaserver_1-code-description-1-2","status":"publish","type":"post","link":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/2026\/05\/20\/mediaserver-mini_mediaserver_1-code-description-1-2\/","title":{"rendered":"[Mediaserver]mini_Mediaserver_1-\ucf54\ub4dc\uc124\uba85\/code description-Protocol Control Messages\u00a0-(1-2)"},"content":{"rendered":"\n

\ud83d\udc49\ud83c\udffb \uc544\ub798\ub294 miniMediaserver_1\uc758 \ucf54\ub4dc \uc124\uba85\uc785\ub2c8\ub2e4.(rtmp_session.cpp)
Below is the code description for miniMediaserver_1 (rtmp_session.cpp).<\/p>\n\n\n\n

\ud83d\udc49\ud83c\udffb void RtmpSession::send_protocol_messages() {} \uc774 \ud568\uc218\uc5d0\uc11c Protocol Control Messages \ub97c \ubcf4\ub0c5\ub2c8\ub2e4.
void RtmpSession::send_protocol_messages() {} This function sends Protocol Control Messages.<\/p>\n\n\n\n

\ud83d\udc49\ud83c\udffb OBS\uac00 \uc11c\ubc84\ub85c \ubcf4\ub0bc \ub370\uc774\ud130 \uc124\uc815 \uac12\uc744 OBS\uc5d0\uac8c \ud1b5\ubcf4\ud569\ub2c8\ub2e4.
Notifies OBS of the data setting values \u200b\u200bto send to the server.<\/p>\n\n\n\n

\u2714\ufe0f void RtmpSession::send_protocol_messages() {}<\/p>\n\n\n\n

— \ud578\ub4dc\uc170\uc774\ud06c \ub05d\ub098\uc790\ub9c8\uc790 \ubc84\ud37c 5MB, \ub300\uc5ed\ud3ed 5MB\/s, \uccad\ud06c 4KB \uc774\ub807\uac8c \uc14b\ud305\ud55c 3\uac00\uc9c0 \uaddc\uce59\uc744 OBS\ud55c\ud14c \ud1b5\ubcf4\ud558\ub294 \ud568\uc218\uc785\ub2c8\ub2e4.
This is a function that notifies OBS of three rules set to 5MB buffer, 5MB\/s bandwidth, and 4KB chunks as soon as the handshake is finished.<\/p>\n\n\n\n

1) Window Acknowledgement Size – type 0x05<\/h3>\n\n\n\n

— obs\uac00 \uc11c\ubc84\uc5d0\uac8c 5Mbyte\uc529 \ub370\uc774\ud130 \ubcf4\ub0b4\uace0 Ack\uae30\ub2e4\ub9ac\ub77c\ub294 \uc14b\ud305 \uac12\uc744 obs\uc5d0\uac8c \uc804\uc1a1 \ud558\ub294 \ubd80\ubd84\uc785\ub2c8\ub2e4.
This is the part where a setting value is sent to OBS to send data to the server in 5Mbyte chunks and wait for an ACK.<\/p>\n\n\n\n

— window\ub77c\ub294 \uc758\ubbf8\ub294 Tcp Sliding window\uc5d0\uc11c \uc628 \ub9d0\uc774\uba70 \uba54\uc138\uc9c0 \ud06c\uae30\ub97c \ucc3d\ubb38\uc758 \ud06c\uae30\ucc98\ub7fc \ud45c\ud604\ud55c \uac81\ub2c8\ub2e4.
The term “window” comes from “TCP Sliding Window,” and it refers to the message size being expressed like the size of a window.<\/p>\n\n\n\n

— \ucf54\ub4dc\uc5d0\uc11c \ube68\uac04\uc0c9\uc740 \ud5e4\ub354 \ubd80\ubd84\uc785\ub2c8\ub2e4. Window Ack,Band with, chunk \ubaa8\ub450 \uacf5\ud1b5\uc785\ub2c8\ub2e4.
The red parts in the code are the header sections. Window Ack, Band with, and chunk are all common.<\/p>\n\n\n\n

1-1. \ub179\uc0c9\uc740 \ub370\uc774\ud130 \ud06c\uae30(5M)\ub97c \ud45c\ud604\ud560 \ubc14\uc774\ud2b8 \uc218(4byte)\uc785\ub2c8\ub2e4.
Green is the number of bytes (4 bytes) to represent the data size (5M).<\/p>\n\n\n\n

\ub178\ub791\uc0c9\uc740 \uc11c\ubc84\uac00 OBS\uc5d0 \ubcf4\ub0b4\ub294 \uba54\uc138\uc9c0 \ud0c0\uc785\uc785\uc774\ub2e4. 0x05\ub294 <\/mark>window ack\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4.
The yellow text indicates the message type the server sends to OBS. 0x05 means a window ack.<\/p>\n\n\n\n

4byte\ub294 pkt.insert(pkt.end(), (uint8_t*)&ack, (uint8_t*)&ack + 4);\uc774 \ucf54\ub4dc\uc5d0 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.
4 bytes are included in this code: pkt.insert(pkt.end(), (uint8_t)&ack, (uint8_t<\/em>)&ack + 4);<\/p>\n\n\n\n

pkt.insert(pkt.end(), {00x02, 0x00, 0x00, 0x00, 0x00, 0x00<\/mark>, 0x04<\/mark>, 0x05<\/mark>, 0x00, 0x00, 0x00, 0x00<\/mark> } );<\/code><\/pre>\n\n\n\n
1-2 htonl()\ud568\uc218\ub97c \uc774\uc6a9\ud574\uc11c \ube45\uc5d4\ub514\uc5b8\uc73c\ub85c \ubc14\uafc9\ub2c8\ub2e4.
Convert to big-endian using the htonl() function.<\/p>\n\n\n\n
uint32_t ack = htonl(5000000);<\/code><\/pre>\n\n\n\n
5000000 = 0x004C4B40\n\n\ub9ac\ud2c0\uc5d4\ub514\uc548 == PC \uba54\ubaa8\ub9ac(\uac70\uafb8\ub85c\uc800\uc7a5\ub428)\nLittle Endian == PC Memory (stored in reverse order): \n40 4B 4C 00\n\n\ube45\uc5d4\ub514\uc5b8 == \ub124\ud2b8\uc6cc\ud06c\uc21c\uc11c(\ubcf5\uad6c)\nBig Endian == Network Order (Recovery) : \n00 4C 4B 40 <\/code><\/pre>\n\n\n\n
1-3 uint32_t<\/code>\ub294 4\ubc14\uc774\ud2b8\uc9dc\ub9ac \ubcc0\uc218\uc778\ub370, uint8_t*<\/code>\ub85c \ubc14\uafb8\uba74 1\ubc14\uc774\ud2b8\uc529 \uc811\uadfc \uac00\ub2a5\ud569\ub2c8\ub2e4.
uint32_t is a 4-byte variable, but if you change it to uint8_t*, you can access it 1 byte at a time.<\/p>\n\n\n\n
1-4.pkt\uc5d0 (uint8_t*)&ack \ub4a4\uc5d0 1~4\ubc14\uc774\ud2b8\uae4c\uc9c0 1\ubc14\uc774\ud2b8 \uc529 \uc77d\uc5b4\uc11c \ucd94\uac00\ud569\ub2c8\ub2e4.
Read bytes 1 through 4 one by one and append them to 1-4.pkt after (uint8_t*)&ack.<\/p>\n\n\n\n
uint32_t ack = htonl(5000000); \npkt.insert(pkt.end(), (uint8_t*)&ack, (uint8_t*)&ack + 4);<\/code><\/pre>\n\n\n\n
2)ack\uc5d0 \ud3ec\ud568\uc2dc\ud0a4\uc9c0 \uc54a\uc744 \uacbd\uc6b0 \ub370\uc774\ud130\ub294 \uc544\ub798\ucc98\ub7fc \ud45c\ud604\ud574\ub3c4\ub429\ub2c8\ub2e4. \ub9c8\uc9c0\ub9c9 \uac80\uc740\uc0c9\uc774 16\uc9c4\uc218\ub85c 5Mbyte\ub97c \ud45c\ud604\ud569\ub2c8\ub2e4.
If not included in the ack, the data may be expressed as follows. The last black part represents 5 Mbytes in hexadecimal.<\/p>\n\n\n\n
pkt.insert(pkt.end(), {\n    0x02, 0x00, 0x00, 0x00, 0x00, 0x00<\/mark>, 0x04<\/mark>, 0x05<\/mark>, 0x00, 0x00, 0x00, 0x00,\n    0x00<\/mark>, 0x4C, 0x4B, 0x40\n});<\/code><\/pre>\n\n\n\n
2) \ub300\uc5ed\ud3ed \/ BandWith<\/h3>\n\n\n\n
1-1. \ub179\uc0c9\uc740 \ub370\uc774\ud130 \ud06c\uae30(5M)\ub97c \ud45c\ud604\ud560 \ubc14\uc774\ud2b8 \uc218(4byte)\uc785\ub2c8\ub2e4. \ub178\ub791\uc0c9\uc740 \uc11c\ubc84\uac00 OBS\uc5d0 \ubcf4\ub0b4\ub294 \uba54\uc138\uc9c0 \ud0c0\uc785\uc785\uc774\ub2e4. 0x06\ub294 <\/mark>bandwith \uba54\uc138\uc9c0 \uc784\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.
Green is the number of bytes (4 bytes) to represent the data size (5M). Yellow is the message type the server sends to OBS. 0x06 means it is a bandwidth message.<\/p>\n\n\n\n
1-2. 00 4C 4B 40 = 5000000(5Mbyte) + 02(limite type)<\/p>\n\n\n\n
1-3 Limite type<\/p>\n\n\n\n
00 : hard -> \ubb34\uc870\uac74 \uc9c0\ucf1c\uc57c\ud568 \/ Must be followed unconditionally\n01 : soft -> \uad8c\uc7a5\uc124\uc815 \/ Recommended settings\n02 : Dynamic  -> \uad8c\uc7a5\uc124\uc815 \ud558\uc9c0\ub9cc OBS \uc804\uc1a1\uc5d0 \ub9de\ucda4 \/ Recommended settings, but customized for OBS transmission<\/code><\/pre>\n\n\n\n
pkt.insert(pkt.end(), {0x02, 0x00, 0x00, 0x00, 0x00, 0x00<\/mark>, 0x05<\/mark>, 0x06<\/mark>, 0x00, 0x00, 0x00, 0x00<\/mark>});<\/code><\/pre>\n\n\n\n
1-4. htonl()\ud568\uc218\ub97c \uc774\uc6a9\ud574\uc11c \ube45\uc5d4\ub514\uc5b8\uc73c\ub85c \ubc14\uafc9\ub2c8\ub2e4.
Convert to big-endian using the htonl() function.<\/p>\n\n\n\n
uint32_t bw = htonl(5000000); <\/code><\/pre>\n\n\n\n
1-5. pkt\uc5d0 (uint8_t*)&ack \ub4a4\uc5d0 1~4\ubc14\uc774\ud2b8\uae4c\uc9c0 1\ubc14\uc774\ud2b8 \uc529 \uc77d\uc5b4\uc11c \ucd94\uac00\ud569\ub2c8\ub2e4. 
\ub9c8\uc9c0\ub9c9\uc5d0 pkt.push_back(0x02); \uc774\ub807\uac8c limit type\ucd94\uac00\ud574\uc11c 5byte\ub97c \uc644\uc131\ud569\ub2c8\ub2e4.
Read bytes 1 through 4 one by one and append them to pkt after (uint8_t*)&ack. 
Finally, add limit type like pkt.push_back(0x02); to complete the 5 bytes.<\/p>\n\n\n\n
    pkt.insert(pkt.end(), (uint8_t*)&bw, (uint8_t*)&bw + 4);\n    pkt.push_back(0x02);<\/code><\/pre>\n\n\n\n
3) Chunk<\/h3>\n\n\n\n
1-1. \ub179\uc0c9\uc740 \ub370\uc774\ud130 \ud06c\uae30(5M)\ub97c \ud45c\ud604\ud560 \ubc14\uc774\ud2b8 \uc218(4byte)\uc785\ub2c8\ub2e4. \ub178\ub791\uc0c9\uc740 \uc11c\ubc84\uac00 OBS\uc5d0 \ubcf4\ub0b4\ub294 \uba54\uc138\uc9c0 \ud0c0\uc785\uc785\uc774\ub2e4. 0x01\ub294 <\/mark>chunk \uba54\uc138\uc9c0 \uc784\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.
Green is the number of bytes (4 bytes) representing the data size (5M). Yellow is the message type the server sends to OBS. 0x01 means it is a chunk message.<\/p>\n\n\n\n
pkt.insert(pkt.end(), {0x02, 0x00, 0x00, 0x00, 0x00, 0x00<\/mark>, 0x04,<\/mark> 0x01<\/mark>, 0x00, 0x00, 0x00, 0x00<\/mark>});<\/code><\/pre>\n\n\n\n
1-2. htonl()\ud568\uc218\ub97c \uc774\uc6a9\ud574\uc11c \ube45\uc5d4\ub514\uc5b8\uc73c\ub85c \ubc14\uafc9\ub2c8\ub2e4. 4096\uc740 RTMP \ud504\ub85c\ud1a0\ucf5c\uc5d0\uc11c OBS\uc5d0\uc11c \uc11c\ubc84\ub85c \ubcf4\ub0bc \uba54\uc138\uc9c0 \ub2e8\uc704 \uc785\ub2c8\ub2e4.
Convert to big-endian using the htonl() function. 4096 is the message unit that OBS sends to the server in the RTMP protocol.<\/p>\n\n\n\n
uint32_t cs = htonl(4096); <\/code><\/pre>\n\n\n\n
1-3. pkt\uc5d0 (uint8_t*)&ack \ub4a4\uc5d0 1~4\ubc14\uc774\ud2b8\uae4c\uc9c0 1\ubc14\uc774\ud2b8 \uc529 \uc77d\uc5b4\uc11c \ucd94\uac00\ud569\ub2c8\ub2e4.
Reads bytes 1 through 4 one by one and appends them to pkt after (uint8_t*)&ack.<\/p>\n\n\n\n
pkt.insert(pkt.end(), (uint8_t*)&cs, (uint8_t*)&cs + 4);<\/code><\/pre>\n\n\n\n
4)Protocol Control Messages \uc804\uc1a1\ud558\uae30
Sending Protocol Control Messages<\/p>\n\n\n\n
— \uc704\uc5d0\uc11c \uc124\uc815\ub41c pkt\ub97c OBS\ub85c \uc804\uc1a1\ud558\uace0 read_chunk_header(); \ud568\uc218\ub97c \uc2e4\ud589\ud569\ub2c8\ub2e4.
Send the pkt configured above to OBS and execute the read_chunk_header(); function.<\/p>\n\n\n\n
    asio::async_write(socket_, asio::buffer(pkt),\n        [this, self](std::error_code ec, std::size_t) {\n            if (ec) return;\n            std::cout << \"[Server] Protocol messages sent\\n\";\n            read_chunk_header();\n        });<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\ud83d\udc49\ud83c\udffb \uc544\ub798\ub294 miniMediaserver_1\uc758 \ucf54\ub4dc \uc124\uba85\uc785\ub2c8\ub2e4.(rtmp_session.cpp)Below is the code description for miniMediaserver_1 (rtmp_session.cpp). \ud83d\udc49\ud83c\udffb void RtmpSession::send_protocol_messages() {} \uc774 \ud568\uc218\uc5d0\uc11c Protocol Control Messages \ub97c \ubcf4\ub0c5\ub2c8\ub2e4.void RtmpSession::send_protocol_messages() {} This function sends Protocol Control Messages. \ud83d\udc49\ud83c\udffb OBS\uac00 \uc11c\ubc84\ub85c \ubcf4\ub0bc \ub370\uc774\ud130 \uc124\uc815 \uac12\uc744 OBS\uc5d0\uac8c \ud1b5\ubcf4\ud569\ub2c8\ub2e4.Notifies OBS of the data setting values \u200b\u200bto send to the server. \u2714\ufe0f void RtmpSession::send_protocol_messages() {} — […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,1],"tags":[],"class_list":["post-5727","post","type-post","status-publish","format-standard","hentry","category-cpp","category-uncategorized","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5727","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=5727"}],"version-history":[{"count":2,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5727\/revisions"}],"predecessor-version":[{"id":5730,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5727\/revisions\/5730"}],"wp:attachment":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=5727"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=5727"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=5727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}