Creating a Sound Board

This example script shows how to send a sound file to a voice channel. A few shortcuts are taken here, for more advanced techniques for connecting to a voice channel see the tutorial Join or Switch to the Voice Channel of the User Issuing a Command .

#include <dpp/dpp.h>
#include <iomanip>
#include <sstream>
 
int main() {
    /* Load a sound file called Robot.pcm into memory.
     * The bot expects PCM format, which are raw sound data,
     * 2 channel stereo, 16 bit signed 48000Hz.
     * 
     * You can use audacity to export these from WAV or MP3 etc.
     * 
     * If you wanted to send a more complicated format, you could
     * use a separate library to decode that audio to PCM. For
     * example purposes, a raw PCM will suffice. This PCM file can
     * be found within the bot's github repo.
     */
    uint8_t* robot = nullptr;
    size_t robot_size = 0;
    std::ifstream input ("../testdata/Robot.pcm", std::ios::in|std::ios::binary|std::ios::ate);
    if (input.is_open()) {
        robot_size = input.tellg();
        robot = new uint8_t[robot_size];
        input.seekg (0, std::ios::beg);
        input.read ((char*)robot, robot_size);
        input.close();
    }
 
    /* Setup the bot */
    dpp::cluster bot("token");
 
    bot.on_log(dpp::utility::cout_logger());
 
    /* The event is fired when someone issues your commands */
    bot.on_slashcommand([&bot, robot, robot_size](const dpp::slashcommand_t& event) {
        /* Check which command they ran */
        if (event.command.get_command_name() == "join") {
            /* Get the guild */
            dpp::guild* g = dpp::find_guild(event.command.guild_id);
 
            /* Attempt to connect to a voice channel, returns false if we fail to connect. */
            if (!g->connect_member_voice(event.command.get_issuing_user().id)) {
                event.reply("You don't seem to be in a voice channel!");
                return;
            }
            
            /* Tell the user we joined their channel. */
            event.reply("Joined your channel!");
        } else if (event.command.get_command_name() == "robot") {
            /* Get the voice channel the bot is in, in this current guild. */
            dpp::voiceconn* v = event.from->get_voice(event.command.guild_id);
 
            /* If the voice channel was invalid, or there is an issue with it, then tell the user. */
            if (!v || !v->voiceclient || !v->voiceclient->is_ready()) {
                event.reply("There was an issue with getting the voice channel. Make sure I'm in a voice channel!");
                return;
            }
 
            /* Tell the bot to play the sound file 'Robot.pcm' in the current voice channel. */
            v->voiceclient->send_audio_raw((uint16_t*)robot, robot_size);
 
            event.reply("Played robot.");
        }
    });
 
    bot.on_ready([&bot](const dpp::ready_t & event) {
        if (dpp::run_once<struct register_bot_commands>()) {
            /* Create a new command. */
            dpp::slashcommand joincommand("join", "Joins your voice channel.", bot.me.id);
 
            dpp::slashcommand robotcommand("robot", "Plays a robot noise in your voice channel.", bot.me.id);
 
            bot.global_bulk_command_create({ joincommand, robotcommand });
        }
    });
 
    /* Start bot */
    bot.start(dpp::st_wait);
 
    return 0;
}