Convert ADF to MP3

Many Grand Theft Auto III and Vice City audio resources are stored as ADF, while phones, editors, and upload services commonly require MP3. The conversion requires decoding the game's proprietary data first, then encoding the resulting audio.

What the ADF format is

In this audio context, ADF is a proprietary GTA audio-data format associated mainly with Grand Theft Auto III and Grand Theft Auto: Vice City. The game uses ADF resources for packaged audio; ADF is not a general-purpose codec such as WAV or MP3 and cannot be converted reliably by changing its filename extension.

ADF files may require related game audio files or metadata to decode correctly. Keep the original files together and use a decoder that explicitly supports the relevant GTA version. An ADF file from another audio application may represent an unrelated proprietary format and require that application's own export function.

What the MP3 format is

MP3 is a widely supported lossy audio format used by media players, websites, messaging services, and many editors. Its perceptual codec removes less-audible information, producing much smaller files than uncompressed WAV, but it cannot restore quality discarded by the source or by an earlier lossy conversion.

For general listening, use LAME variable-bitrate quality V2, approximately 190 kb/s on typical material. Use 192k or 256k constant bitrate when a service requires a predictable bitrate or file size.

Convert GTA ADF files with MFAudio

1. Make a backup of the ADF files and any accompanying GTA audio resources.
2. Open the files in MFAudio, a Windows utility that supports several game-audio formats, including GTA III and Vice City ADF variants. Select the correct game or format if the program asks for it.
3. Export or convert the decoded audio to WAV. Use the program's detected sample rate, channels, and bit depth unless the source documentation specifies different values.
4. Play the WAV to check duration, channels, speed, and audible distortion before encoding it as MP3.

MFAudio is an older utility, so compatibility with current Windows versions and availability from trustworthy download sources can vary. Do not download unknown repackaged copies; if it cannot identify the file, use the original game's modding or extraction tool for that specific release rather than forcing the ADF through a generic converter.

Encode the exported audio with FFmpeg

FFmpeg provides consistent MP3 encoding after the ADF has been exported to standard audio:

ffmpeg -i input.wav -c:a libmp3lame -q:a 2 output.mp3

For a fixed bitrate, replace the quality option with:

ffmpeg -i input.wav -c:a libmp3lame -b:a 192k output.mp3

Audacity is an alternative desktop workflow: import the WAV through File → Import → Audio, then use File → Export Audio, choose MP3 Files, and select the bitrate. Audacity does not decode an arbitrary ADF file merely because it has an audio-related extension.

When the ADF is raw audio data

Some unrelated audio programs use .adf for headerless PCM or proprietary recordings. If documentation identifies the file as raw PCM, determine its sample format, byte order, sample rate, and channel count before decoding it. For example:

ffmpeg -f s16le -ar 44100 -ac 2 -i input.adf -c:a libmp3lame -q:a 2 output.mp3

Replace s16le, 44100, and 2 with the documented values. Incorrect parameters cause noise, wrong playback speed, distortion, or incorrect channel layout; guessing them is not a conversion method.

Online conversion options

General online converters usually do not decode proprietary GTA ADF files reliably. Use MFAudio or the format's own extractor first, then upload the resulting WAV to a service such as CloudConvert or Zamzar and select MP3. Confirm that the upload page identifies the input as WAV before submitting it; a service that merely accepts the .adf extension may produce an error or unusable output.

Online processing sends the recording to a third party and may remove metadata, so use a local FFmpeg or Audacity workflow for private files, large batches, or preservation work.

Quality and compatibility limits

Keep the original ADF and export to an uncompressed WAV intermediate. Converting directly between lossy formats reduces quality, and MP3 may omit game-specific metadata, markers, looping information, multichannel structure, or timestamps.

After encoding, test the MP3 in more than one player and check its duration, channel count, clipping, and start and end points. If the ADF is only a container or reference file, extract or consolidate its associated audio resources first; converting the container alone may produce no playable sound.