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Kasper Skaarhoj 13 years ago
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ATEM.cpp
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/*
Copyright 2012 Kasper Skårhøj, SKAARHOJ, kasperskaarhoj@gmail.com
This file is part of the ATEM library for Arduino
The ATEM library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The ATEM library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with the ATEM library. If not, see http://www.gnu.org/licenses/.
*/
#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
#include "ATEM.h"
ATEM::ATEM(IPAddress ip, uint16_t localPort){
// Set up Udp communication object:
EthernetUDP Udp;
_Udp = Udp;
_switcherIP = ip; // Set switcher IP address
_localPort = localPort; // Set local port (just a random number I picked)
}
void ATEM::connect() {
_localPacketIdCounter = 1; // Init localPacketIDCounter to 1;
_hasInitialized = false;
_Udp.begin(_localPort);
// Send connectString to ATEM:
// TODO: Describe packet contents according to rev.eng. API
byte connectHello[] = {
0x10, 0x14, 0x53, 0xAB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3A, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
_Udp.beginPacket(_switcherIP, 9910);
_Udp.write(connectHello,20);
_Udp.endPacket();
// Waiting for the ATEM to answer back with a packet 20 bytes long.
// According to packet analysis with WireShark, this feedback from ATEM
// comes within a few microseconds!
uint16_t packetSize = 0;
while(packetSize!=20) {
packetSize = _Udp.parsePacket();
}
// Read the response packet. We will only subtract the session ID
// According to packet analysis with WireShark, this feedback from ATEM
// comes a few microseconds after our connect invitation above. Two packets immediately follow each other.
// After approx. 200 milliseconds a third packet is sent from ATEM - a sort of re-sent because it gets impatient.
// And it seems that THIS third packet is the one we actually read and respond to. In other words, I believe that
// the ethernet interface on Arduino actually misses the first two for some reason!
while(!_Udp.available()){} // Waiting.... TODO: Implement some way to exit if there is no answer!
_Udp.read(_packetBuffer,20);
_sessionID = _packetBuffer[15];
// Send connectAnswerString to ATEM:
_Udp.beginPacket(_switcherIP, 9910);
// TODO: Describe packet contents according to rev.eng. API
byte connectHelloAnswerString[] = {
0x80, 0x0c, 0x53, 0xab, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00 };
_Udp.write(connectHelloAnswerString,12);
_Udp.endPacket();
}
void ATEM::runLoop() {
// WARNING:
// It can cause severe timing problems using "slow" functions such as Serial.print*()
// in the runloop, in particular during "boot" where the ATEM delivers some 10-20 kbytes of system status info which
// must exit the RX-buffer quite fast. Therefore, using Serial.print for debugging in this
// critical phase will in it self affect program execution!
// Limit of the RX buffer of the Ethernet interface is another general issue.
// When ATEM sends the initial system status packets (10-20 kbytes), they are sent with a few microseconds in between
// The RX buffer of the Ethernet interface on Arduino simply does not have the kapacity to take more than 2k at a time.
// This means, that we only receive the first packet, the others seems to be discarded. Luckily most information we like to
// know about is in the first packet (and some in the second, the rest is probably thumbnails for the media player).
// It may be possible to bump up this buffer to 4 or 8 k by simply re-configuring the amount of allowed sockets on the interface.
// For some more information from a guy seemingly having a similar issue, look here:
// http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1282170842
// If there's data available, read a packet
uint16_t packetSize = _Udp.parsePacket();
if (_Udp.available() && packetSize !=0) {
// Read packet header of 12 bytes:
_Udp.read(_packetBuffer, 12);
// Read out packet length (first word), remote packet ID number and "command":
uint16_t packetLength = word(_packetBuffer[0] & B00000111, _packetBuffer[1]);
uint16_t remotePacketID = word(_packetBuffer[10],_packetBuffer[11]);
uint8_t command = _packetBuffer[0] & B11111000;
boolean command_ACK = command & B00001000 ? true : false; // If true, ATEM expects an acknowledgement answer back!
// The five bits in "command" (from LSB to MSB):
// 1 = ACK, "Please respond to this packet" (using the remotePacketID). Exception: The initial 10-20 kbytes of Switcher status
// 2 = Initialization (first hand-shake packets contains that)
// 3 = "This is a retransmission". You will see this bit set if the ATEM switcher did not get a timely response to a packet.
// 5 = "This is a response on your request". So set this when answering...
if (packetSize==packetLength) { // Just to make sure these are equal, they should be!
// If a packet is 12 bytes long it indicates that all the initial information
// has been delivered from the ATEM and we can begin to answer back on every request
// Currently we don't know any other way to decide if an answer should be sent back...
if(!_hasInitialized && packetSize == 12) {
_hasInitialized = true;
}
if (packetLength > 12) {
_parsePacket(packetLength);
}
// If we are initialized, lets answer back no matter what:
if (_hasInitialized && command_ACK) {
Serial.print("ACK, rpID: ");
Serial.println(remotePacketID, DEC);
_sendAnswerPacket(remotePacketID);
}
} else {
Serial.print("ERROR: Packet size mismatch: ");
Serial.print(packetSize, DEC);
Serial.print(" != ");
Serial.println(packetLength, DEC);
// Flushing the buffer:
// TODO: Other way? _Udp.flush() ??
while(_Udp.available()) {
_Udp.read(_packetBuffer, 96);
}
}
}
}
void ATEM::_parsePacket(uint16_t packetLength) {
// If packet is more than an ACK packet (= if its longer than 12 bytes header), lets parse it:
uint16_t indexPointer = 12;
while (indexPointer < packetLength) {
// Read the length of segment (first word):
_Udp.read(_packetBuffer, 2);
uint16_t cmdLength = word(0, _packetBuffer[1]);
// If length of segment fits into buffer, lets read it, otherwise throw an error:
if (cmdLength>2 && cmdLength<=96) {
// Read the rest of the segment:
_Udp.read(_packetBuffer, cmdLength-2);
// Get the "command string", basically this is the 4 char variable name in the ATEM memory holding the various state values of the system:
char cmdStr[] = {
_packetBuffer[-2+4], _packetBuffer[-2+5], _packetBuffer[-2+6], _packetBuffer[-2+7], '\0' };
// Extract the specific information we like to know about in this implementation:
if(strcmp(cmdStr, "PrgI") == 0) { // Program Bus status
_ATEM_PrgI = _packetBuffer[-2+8+1];
Serial.print("Program Bus: ");
Serial.println(_packetBuffer[-2+8+1], DEC);
}
if(strcmp(cmdStr, "PrvI") == 0) { // Preview Bus status
_ATEM_PrvI = _packetBuffer[-2+8+1];
Serial.print("Preview Bus: ");
Serial.println(_packetBuffer[-2+8+1], DEC);
}
indexPointer+=cmdLength;
} else {
// Error, just get out of the loop ASAP:
Serial.print("ERROR: Command Size mismatch: ");
Serial.print(cmdLength, DEC);
indexPointer = 2000;
// Flushing the buffer:
// TODO: Other way? _Udp.flush() ??
while(_Udp.available()) {
_Udp.read(_packetBuffer, 96);
}
}
}
}
void ATEM::_sendAnswerPacket(uint16_t remotePacketID) {
//Answer packet:
memset(_answer, 0, 12); // Using 12 bytes of answer buffer, setting to zeros.
_answer[2] = 0x80; // ??? API
_answer[3] = _sessionID; // Session ID
_answer[4] = remotePacketID/256; // Remote Packet ID, MSB
_answer[5] = remotePacketID%256; // Remote Packet ID, LSB
_answer[9] = 0x41; // ??? API
// The rest is zeros.
// Create header:
uint16_t returnPacketLength = 10+2;
_answer[0] = returnPacketLength/256;
_answer[1] = returnPacketLength%256;
_answer[0] |= B10000000;
// Send connectAnswerString to ATEM:
_Udp.beginPacket(_switcherIP, 9910);
_Udp.write(_answer,returnPacketLength);
_Udp.endPacket();
}
void ATEM::_sendCommandPacket(char cmd[4], uint8_t commandBytes[16], uint8_t cmdBytes) {
if (cmdBytes <= 4) { // Currently, only a lenght of 4 - can be extended, but then the _answer buffer must be prolonged as well (to more than 24)
//Answer packet preparations:
memset(_answer, 0, 24);
_answer[2] = 0x80; // ??? API
_answer[3] = _sessionID; // Session ID
_answer[10] = _localPacketIdCounter/256; // Remote Packet ID, MSB
_answer[11] = _localPacketIdCounter%256; // Remote Packet ID, LSB
// The rest is zeros.
// Command identifier (4 bytes, after header (12 bytes) and local segment length (4 bytes)):
int i;
for (i=0; i<4; i++) {
_answer[12+4+i] = cmd[i];
}
// Command value (after command):
for (i=0; i<cmdBytes; i++) {
_answer[12+4+4+i] = commandBytes[i];
}
// Command length:
_answer[12] = (4+4+cmdBytes)/256;
_answer[12+1] = (4+4+cmdBytes)%256;
// Create header:
uint16_t returnPacketLength = 10+2+(4+4+cmdBytes);
_answer[0] = returnPacketLength/256;
_answer[1] = returnPacketLength%256;
_answer[0] |= B00001000;
// Send connectAnswerString to ATEM:
_Udp.beginPacket(_switcherIP, 9910);
_Udp.write(_answer,returnPacketLength);
_Udp.endPacket();
_localPacketIdCounter++;
}
}
uint8_t ATEM::getATEM_PrgI() {
return _ATEM_PrgI;
}
void ATEM::setATEM_PrgI(uint8_t inputNumber) {
// TODO: Validate that input number exists on current model!
// On ATEM 1M/E: Black (0), 1 (1), 2 (2), 3 (3), 4 (4), 5 (5), 6 (6), 7 (7), 8 (8), Bars (9), Color1 (10), Color 2 (11), Media 1 (12), Media 2 (14)
uint8_t commandBytes[4] = {0, inputNumber, 0, 0};
_sendCommandPacket("CPgI", commandBytes, 4);
}
uint8_t ATEM::getATEM_PrvI() {
return _ATEM_PrvI;
}
void ATEM::setATEM_PrvI(uint8_t inputNumber) {
// TODO: Validate that input number exists on current model!
uint8_t commandBytes[4] = {0, inputNumber, 0, 0};
_sendCommandPacket("CPvI", commandBytes, 4);
}
void ATEM::send_cut() {
uint8_t commandBytes[4] = {0, 0xef, 0xbf, 0x5f}; // I don't know what that actually means...
_sendCommandPacket("DCut", commandBytes, 4);
}

71
ATEM.h
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/*
Copyright 2012 Kasper Skårhøj, SKAARHOJ, kasperskaarhoj@gmail.com
This file is part of the ATEM library for Arduino
The ATEM library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The ATEM library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with the ATEM library. If not, see http://www.gnu.org/licenses/.
*/
#ifndef ATEM_h
#define ATEM_h
#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
#include <EthernetUdp.h>
class ATEM
{
private:
EthernetUDP _Udp; // Udp Object for communication, see constructor.
uint16_t _localPort; // local port to send from
IPAddress _switcherIP; // IP address of the switcher
uint8_t _sessionID; // Used internally for storing packet size during communication
char _packetBuffer[96]; // Buffer for storing segments of the packets from ATEM. Has the size of the largest known "segment" of a packet the ATEM sends.
uint16_t _localPacketIdCounter; // This is our counter for the command packages we might like to send to ATEM.
boolean _hasInitialized; // If true, the initial reception of the ATEM memory has passed and we can begin to respond during the runLoop()
uint8_t _answer[24]; // Little buffer for creating answers back to the ATEM
// Selected ATEM Status values:
uint8_t _ATEM_PrgI; // Program input channel
uint8_t _ATEM_PrvI; // Preview input channel
public:
ATEM(IPAddress ip, uint16_t localPort);
void connect();
void runLoop();
private:
void _sendAnswerPacket(uint16_t remotePacketID);
void _parsePacket(uint16_t packetLength);
void _sendCommandPacket(char cmd[4], uint8_t commandBytes[16], uint8_t cmdBytes);
public:
void setATEM_PrgI(uint8_t inputNumber);
uint8_t getATEM_PrgI();
void setATEM_PrvI(uint8_t inputNumber);
uint8_t getATEM_PrvI();
void send_cut();
};
#endif

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examples/.DS_Store vendored
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16
examples/ATEMmonitor/ATEMmonitor.pde
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#include <Morse.h>
Morse morse(13);
void setup()
{
}
void loop()
{
morse.dot(); morse.dot(); morse.dot();
morse.dash(); morse.dash(); morse.dash();
morse.dot(); morse.dot(); morse.dot();
delay(3000);
}

3
keywords.txt
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Morse KEYWORD1
dash KEYWORD2
dot KEYWORD2
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