San Andreas uses a hierarchical system for managing sound effects, as opposed to the flat arrays of effects used in previous titles. Instead of individual sounds, SA has packages which group sounds based on where they are used in the game, and these sounds are further separated into banks based on what they are used for, with each bank containing up to 400 sounds.

The bank/package system allows the game to only load the sound(s) needed at the moment – in some instances, the game only loads a single sound from a bank (though it is more common for entire banks to be loaded at a time).

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1File formats
- 1.3Packages

File formats

.dat files are SFX config files. They describe the layout of the audio effects system in terms of packages, banks and individual sounds. They are stored in the audio/CONFIG directory. All .dat files have names with 8 characters (minus the extension).

PakFiles.dat

PakFiles.dat ('Package Files') is a list of package names. Each name takes up 52 bytes.

The package name is always null-terminated, and in the stock files the name is padded up to 12 bytes with 0xCD values. The rest of the 52 bytes are zeros. The game works in exactly the same way without the 0xCD bytes, but their presence may indicate that PakFiles.dat is actually a dumped array of 52-byte structures rather than an array of strings.

The package names are the same as their file names inside the audio/SFX directory. In other files and also in the game, each package is referred to by its 0-based index in the package list (0, 1, 2, etc.).

BankLkup.dat

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BankLkup.dat ('Bank Lookup') contains an array of metadata structures for all banks in all packages.

Note that the game uses hardcoded indices to reference specific banks, so changes in order can lead to problems.

The BankSize field must be updated if the size of the bank changes, especially if the size increases, because the game works out the length of each sound the same way as the calculateBufferSize function displayed below. If BankSize is too big, the game will read too far on the last sound, which often causes a segmentation fault.

Packages

Package files contain banks, which contain sound data (including the raw PCM data). Packages are in the audio/SFX directory and have no file extension.

An unmodified game has the following packages:

FEET
GENRL
PAIN_A
SCRIPT
SPC_EA
SPC_FA
SPC_GA
SPC_NA
SPC_PA

Each bank stored in a package file has two parts: the header and the PCM buffers. The PCM buffers follow the header.

Sound structure

Most of the bank header is made up of sound metadata, which has the following structure:

The Headroom value tells the game how loud the sound will be. This allows the game to adjust what volume to play the sound at in order to prevent the audio clipping. A value of 0 tells the game that the sound is about average volume, with negative values meaning the sound is quieter and positive values meaning it's louder.

LoopOffset is the position of the start of the looped part of the sound, measured in samples. This value is used to give looped sounds an 'introduction' – for example, the sound of a car's engine starting up should have an unlooped ignition sound, but the sound of the engine running after starting should be looped. If LoopOffset is -1, the sound does not loop.

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Bank structure

The actual bank header structure is as follows:

The BankHeader structure's location is specified by the BankHeaderOffset value of the bank's BankMeta structure. The maximum number of sounds in each bank is 400.

The audio sample buffers are all in signed 16-bit mono PCM format. This is the same format as in previous titles, with the only difference between SA and GTA 2/III/VC's sound systems being that SA stores just the PCM data along with a SoundMeta structure rather than storing a full WAV file. The SoundMeta structure contains enough data to construct .wav files but at less of a storage cost than the actual WAV header format, allowing more sounds to be used in the game.

The offset of a sound's PCM buffer can be calculated with the following function:

Since the SoundMeta structure does not specify the size of the buffer, it must be calculated.In the following code, bankAudioSize is BankMeta.BankSize for the current bank.

BankSlot.dat

A bank slot is capable of storing some SFX data, this data can be either one entire bank or one single sound from a bank. There is a total of 45 bank slots.

Each bank slot is used by a specific audio class of the game, for example 10 slots are used for vehicle banks, one slot for the bank of explosions, 4 slots for script speeches (which stores single sounds), and so on.

The BankSlot.dat file's structure is

where Slot is

Each slot owns a buffer capable of storing some amount of sound data. If this size is lower than the size of the data stored in the slot, sound artifacts will occur in-game.

By default, those buffer sizes are arbitrary values, but it can safely be the size of the highest bank stored in the slot or the size of the highest sound stored in the slot, depending if the slot is used to store a sound or a bank.

Mobile

The mobile version of GTA: San Andreas replaces the previous raw sound storage system with .osw and .osw.idx files. An .osw file is actually an uncompressed ZIP file, and can be opened with most ZIP viewers/extractors. The .osw.idx file stores a table of contents for the entries in the .osw file with the same name.

All the game's sounds are present inside the .osw files in MP3 format. This compression allows all of the .osw files containing sound effects to take up just 731MB on the mobile version, while the combined size of the SFX files in the PC version is 2.3GB. It may be worth noting that the .osw files themselves do not contribute to this decreased size because they are not compressed.

The index files begin with the number of entries:

The rest of the file is made up of the same repeated structure:

However, as the length of the file name is dynamic, the structure cannot be read from a buffer directly and code similar to the following must instead be used to read an entry structure:

The BankLkup.dat, BankSlot.dat and PakFiles.dat files are present on mobile and are identical to the PC versions.