BASS_CDG Tutorial: Adding Karaoke Lyrics to Your Media Player

BASS_CDG Tutorial: Adding Karaoke Lyrics to Your Media Player

Integrating karaoke support into a custom media player elevates the user experience. The BASS audio library, paired with the BASS_CDG add-on, allows developers to render CD+G (Compact Disc plus Graphics) lyrics seamlessly. This tutorial provides a step-by-step guide to setting up and coding karaoke functionality. Prerequisites and Setup

Before writing code, gather the necessary library files and binaries.

Download BASS: Secure the core BASS library binary and development files.

Download BASS_CDG: Obtain the CDG add-on from the un4seen developments website.

Project Reference: Link bass.lib and bass_cdg.lib to your project headers.

Runtime Files: Place bass.dll and bass_cdg.dll into your application executable directory. Step 1: Initialize the Audio Device

Initialize the main BASS system before loading the CDG plugin.

#include “bass.h” #include “bass_cdg.h” // Initialize default audio output device at 44100Hz if (!BASS_Init(-1, 44100, 0, 0, NULL)) { // Handle initialization error } Use code with caution. Step 2: Load the CDG Plugin

Explicitly loading the plugin enables BASS to automatically pair .cdg graphics files with their matching .mp3 or .wav audio tracks.

// Load the CDG plugin binary HPLUGIN cdgPlugin = BASS_PluginLoad(“bass_cdg.dll”, 0); if (!cdgPlugin) { // Plugin failed to load } Use code with caution. Step 3: Create the Stream

Load your audio file. The BASS_CDG system automatically searches for a file with the same name and a .cdg extension in the same directory.

// Create a stream from an audio file DWORD stream = BASS_StreamCreateFile(FALSE, “song.mp3”, 0, 0, 0); if (!stream) { // Handle stream creation failure } Use code with caution. Step 4: Render the Graphics

CD+G tracks render lyrics as a video stream frameset. You must retrieve the visual bitmap frames from the stream and draw them onto your application window or canvas during playback.

// Start audio playback BASS_ChannelPlay(stream, FALSE); // Update loop (run this inside your window timer or frame render loop) void RenderLyrics(HWND hwnd, DWORD stream) { // Get the current CDG frame bitmap handle HBITMAP hCdgBitmap = (HBITMAP)BASS_ChannelGetAttributeEx(stream, BASS_ATTRIB_CDG_BITMAP, NULL, 0); if (hCdgBitmap) { // Draw the bitmap to your window device context (DC) HDC hdc = GetDC(hwnd); HDC hMemDC = CreateCompatibleDC(hdc); SelectObject(hMemDC, hCdgBitmap); // CD+G standard resolution is 300x216 pixels BitBlt(hdc, 0, 0, 300, 216, hMemDC, 0, 0, SRCCOPY); DeleteDC(hMemDC); ReleaseDC(hwnd, hdc); } } Use code with caution. Step 5: Clean Up Resources

Properly free allocated memory and plugin handles when closing the player.

// Free the audio stream BASS_StreamFree(stream); // Unload the CDG plugin BASS_PluginFree(cdgPlugin); // Free BASS library resources BASS_Free(); Use code with caution.

If you want to tailor this implementation to your project, let me know:

What programming language are you using? (C++, C#, Delphi, VB.NET?)