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  1. 1
      .gitignore
  2. 39
      include/README
  3. 46
      lib/README
  4. 22
      platformio.ini
  5. 3
      requirements.txt
  6. 72
      scene_is_currently_visible
  7. 228
      src/main.cpp
  8. 11
      test/README

1
.gitignore

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.pio

39
include/README

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This directory is intended for project header files.
A header file is a file containing C declarations and macro definitions
to be shared between several project source files. You request the use of a
header file in your project source file (C, C++, etc) located in `src` folder
by including it, with the C preprocessing directive `#include'.
```src/main.c
#include "header.h"
int main (void)
{
...
}
```
Including a header file produces the same results as copying the header file
into each source file that needs it. Such copying would be time-consuming
and error-prone. With a header file, the related declarations appear
in only one place. If they need to be changed, they can be changed in one
place, and programs that include the header file will automatically use the
new version when next recompiled. The header file eliminates the labor of
finding and changing all the copies as well as the risk that a failure to
find one copy will result in inconsistencies within a program.
In C, the usual convention is to give header files names that end with `.h'.
It is most portable to use only letters, digits, dashes, and underscores in
header file names, and at most one dot.
Read more about using header files in official GCC documentation:
* Include Syntax
* Include Operation
* Once-Only Headers
* Computed Includes
https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

46
lib/README

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This directory is intended for project specific (private) libraries.
PlatformIO will compile them to static libraries and link into executable file.
The source code of each library should be placed in a an own separate directory
("lib/your_library_name/[here are source files]").
For example, see a structure of the following two libraries `Foo` and `Bar`:
|--lib
| |
| |--Bar
| | |--docs
| | |--examples
| | |--src
| | |- Bar.c
| | |- Bar.h
| | |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
| |
| |--Foo
| | |- Foo.c
| | |- Foo.h
| |
| |- README --> THIS FILE
|
|- platformio.ini
|--src
|- main.c
and a contents of `src/main.c`:
```
#include <Foo.h>
#include <Bar.h>
int main (void)
{
...
}
```
PlatformIO Library Dependency Finder will find automatically dependent
libraries scanning project source files.
More information about PlatformIO Library Dependency Finder
- https://docs.platformio.org/page/librarymanager/ldf.html

22
platformio.ini

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; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:default]
board = nodemcuv2
framework = arduino
monitor_speed = 115200
platform = espressif8266
upload_protocol = esptool
lib_deps =
bblanchon/ArduinoJson@^6.17.3
fastled/FastLED@^3.4.0
rweather/Crypto@^0.2.0
agdl/Base64@^1.0.0
links2004/WebSockets@^2.3.6

3
requirements.txt

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obs-websocket-py==0.5.3
six==1.16.0
websocket-client==1.2.1

72
scene_is_currently_visible

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#!/usr/bin/env python3
from sys import argv
import logging
import time
from obswebsocket import events, obsws
logging.basicConfig(
format="%(asctime)s %(name)s [%(levelname)s] %(message)s",
level=logging.INFO,
)
log = logging.getLogger(__name__)
host = "localhost"
port = 4444
password = "12345"
my_source_name = argv[1]
my_source_is_program = False
my_source_is_preview = False
def on_event(message):
global my_source_is_program, my_source_is_preview
my_source_in_current_event = False
if isinstance(message, events.SwitchScenes):
visibility = "PROGRAM"
elif isinstance(message, events.PreviewSceneChanged):
visibility = "PREVIEW"
else:
return
for source in message.datain["sources"]:
log.debug(f'visibility of scene {message.datain["scene-name"]} changed, {source["name"]} is now {visibility}')
if source["name"] == my_source_name:
my_source_in_current_event = True
if my_source_in_current_event:
if visibility == "PROGRAM":
my_source_is_program = True
else:
my_source_is_preview = True
else:
if visibility == "PROGRAM":
my_source_is_program = False
else:
my_source_is_preview = False
if my_source_is_program:
log.info(f"{my_source_name} is PROGRAM (and maybe preview)")
elif my_source_is_preview:
log.info(f"{my_source_name} is PREVIEW only")
else:
log.info(f"{my_source_name} is not visible")
ws = obsws(host, port, password)
ws.register(on_event)
ws.connect()
try:
log.info("Waiting ...")
time.sleep(3600)
log.warn("Timeout!")
except KeyboardInterrupt:
pass
ws.disconnect()

228
src/main.cpp

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#include <ESP8266WiFi.h>
#include <WebSocketsClient.h>
#include <ArduinoJson.h>
#include <FastLED.h>
#include <Hash.h>
#include <SHA256.h>
#include <Base64.h>
// BEGIN CONFIGURATION
#define LED_COUNT 19
#define LED_BRIGHTNESS 100
#define LED_PIN D4
#define WIFI_SSID ""
#define WIFI_PASS ""
#define OBS_HOST ""
#define OBS_PORT 4444
#define OBS_PASS ""
#define OBS_SOURCE ""
// END CONFIGURATION
#define HASH_SIZE 32
CRGB leds[LED_COUNT];
WebSocketsClient webSocket;
SHA256 sha256;
bool is_currently_live = false;
bool is_currently_preview = false;
void set_program() {
fill_solid(leds, LED_COUNT, CRGB::Red);
FastLED.show();
}
void set_preview() {
fill_solid(leds, LED_COUNT, CRGB::Green);
FastLED.show();
}
void set_idle() {
fill_solid(leds, LED_COUNT, CRGB::Black);
FastLED.show();
}
void set_error() {
fill_solid(leds, LED_COUNT, CRGB::Purple);
FastLED.show();
}
void handleWebSocketEvent(WStype_t type, uint8_t * payload, size_t length) {
switch(type) {
case WStype_DISCONNECTED:
Serial.println("[WS] disconnected");
/*
We do NOT set the LEDs to off in here on purpose. Maybe
just the wifi connection was interrupted or something
like that. It is important we don't disable the LEDs, in
case the OBS instance is still running.
We do, however, set the LEDs to the "error" state, to
indicate we don't currently know what OBS is showing.
*/
set_error();
break;
case WStype_CONNECTED:
Serial.printf("[WS] connected to %s\n", payload);
// Find out if we need authentication
webSocket.sendTXT("{\"request-type\":\"GetAuthRequired\",\"message-id\":\"1\"}");
break;
case WStype_TEXT: {
Serial.printf("[WS] %s", payload);
StaticJsonDocument<5000> doc;
DeserializationError error = deserializeJson(doc, payload);
if (error) {
Serial.print("deserializeJson() failed: ");
Serial.println(error.c_str());
break;
}
if (doc.containsKey("authRequired")) {
Serial.println("[OBS] auth requested");
sha256.reset();
sha256.update(OBS_PASS, strlen(OBS_PASS));
const char* salt = doc["salt"];
sha256.update(salt, strlen(salt));
char value[HASH_SIZE];
sha256.finalize(value, HASH_SIZE);
Serial.print("[OBS] sha256 authentication hash is: ");
for (size_t i = 0; i < HASH_SIZE; i++) {
Serial.print(static_cast<unsigned int>(value[i]), HEX);
}
Serial.println();
int encodedLength = Base64.encodedLength(HASH_SIZE);
char encodedPassSaltHash[encodedLength];
Base64.encode(encodedPassSaltHash, value, HASH_SIZE);
const char* challenge = doc["challenge"];
sha256.reset();
sha256.update(encodedPassSaltHash, encodedLength);
sha256.update(challenge, strlen(challenge));
sha256.finalize(value, HASH_SIZE);
Serial.print("[OBS] sha256 challenge hash is: ");
for (size_t i = 0; i < HASH_SIZE; i++) {
Serial.print(static_cast<unsigned int>(value[i]), HEX);
}
Serial.println();
char encodedAuthString[encodedLength];
Base64.encode(encodedAuthString, value, HASH_SIZE);
String authRequest = String("{\"request-type\":\"Authenticate\",\"message-id\":\"2\",\"auth\":\"") + encodedAuthString + "\"}";
webSocket.sendTXT(authRequest);
break;
} else if (doc.containsKey("message-id") && (doc["message-id"]) == "2") {
if (strcmp(doc["status"], "ok") == 0) {
Serial.println("[OBS] authentication successful");
webSocket.sendTXT("{\"request-type\":\"GetCurrentScene\",\"message-id\":\"3\"}");
webSocket.sendTXT("{\"request-type\":\"GetPreviewScene\",\"message-id\":\"4\"}");
} else {
Serial.println("Authenticated FAILED");
set_error();
}
break;
} else if (doc.containsKey("update-type")) {
bool my_source_in_current_event = false;
for (uint8_t i = 0; i < doc["sources"].size(); i++) {
if (strcmp(doc["sources"][i]["name"], OBS_SOURCE) == 0) {
my_source_in_current_event = true;
}
}
if (strcmp(doc["update-type"], "SwitchScenes") == 0 || strcmp(doc["update-type"], "GetCurrentScene") == 0) {
if (my_source_in_current_event) {
is_currently_live = true;
} else {
is_currently_live = false;
}
} else if (strcmp(doc["update-type"], "PreviewSceneChanged") == 0 || strcmp(doc["update-type"], "GetPreviewScene") == 0) {
if (my_source_in_current_event) {
is_currently_preview = true;
} else {
is_currently_preview = false;
}
} else if (strcmp(doc["update-type"], "Exiting") == 0) {
is_currently_preview = false;
is_currently_live = false;
} else if (strcmp(doc["update-type"], "StudioModeSwitched") == 0 && doc["new-state"] == false) {
is_currently_preview = false;
}
}
if (is_currently_live) {
set_program();
} else if (is_currently_preview) {
set_preview();
} else {
set_idle();
}
}
case WStype_BIN:
case WStype_ERROR:
case WStype_FRAGMENT_TEXT_START:
case WStype_FRAGMENT_BIN_START:
case WStype_FRAGMENT:
case WStype_FRAGMENT_FIN:
case WStype_PING:
case WStype_PONG:
break;
}
}
void setup() {
Serial.begin(115200);
Serial.println("[Tally] starting up");
FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, LED_COUNT);
FastLED.setBrightness(LED_BRIGHTNESS);
set_error();
delay(500);
set_idle();
delay(500);
set_error();
delay(500);
set_idle();
delay(200);
Serial.printf("[Tally] connecting to wifi ssid: %s\n", WIFI_SSID);
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASS);
while(WiFi.status() != WL_CONNECTED) {
delay(250);
Serial.print(".");
}
Serial.println();
Serial.print("[Tally] connected to wifi, ip address");
Serial.println(WiFi.localIP());
Serial.println("[Tally] connecting to OBS");
webSocket.begin(OBS_HOST, OBS_PORT, "/");
webSocket.onEvent(handleWebSocketEvent);
webSocket.setReconnectInterval(2000);
Serial.println("[Tally] startup complete");
}
void loop() {
webSocket.loop();
}

11
test/README

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This directory is intended for PlatformIO Unit Testing and project tests.
Unit Testing is a software testing method by which individual units of
source code, sets of one or more MCU program modules together with associated
control data, usage procedures, and operating procedures, are tested to
determine whether they are fit for use. Unit testing finds problems early
in the development cycle.
More information about PlatformIO Unit Testing:
- https://docs.platformio.org/page/plus/unit-testing.html
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