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{{Trail|File Formats}}[[Category:ESOMod-Mods]]
Although RIFF files are a very popular data type used for saving WAV files, those used in the game files have modified, shortened headers which cannot be interpreted by media players. This page describes the relatively simple procedure required to make these otherwise-normal WAV files readable by any media player.
==Header Format==
The files used are in the WAVE_FORMAT_EXTENSIBLE structure. All numerical values are little endian.
===Original Format===
The original header format for WAV files is as such:
byte RIFF[4] = "RIFF"
dword fileSize
byte WAVE[4] = "WAVE"
byte fmt_[4] = "fmt "
dword fmtSize = 0x28000000 //40 bytes
word fmtTag = 0xFEFF //WAVE_FORMAT_EXTENSIBLE
word nChannels
dword nSamplesPerSec
dword nAvgBytesPerSec
word nBlockAlign
word nBitsPerSample
word cbSize = 0x1600 //22 extra bytes of format info
word nValidBitsPerSample
dword channelMask //See below
byte subFormat[16] = 0x0100000000001000800000AA00389B71
byte DATA[4] = "DATA"
dword dataSize
For more info on ChannelMask, refer to [http://msdn.microsoft.com/en-us/library/windows/desktop/microsoft.directx_sdk.reference.waveformatextensible(v=vs.85).aspx this site].
===Game Format===
The header format for the extracted audio is slightly different:
byte RIFF[4] = "RIFF"
dword fileSize
byte WAVE[4] = "WAVE"
byte fmt_[4] = "fmt "
dword fmtSize = 0x18000000 //24 bytes, not 40
word fmtTag = 0xFEFF //WAVE_FORMAT_EXTENSIBLE
word nChannels
dword nSamplesPerSec
dword nAvgBytesPerSec
word nBlockAlign
word nBitsPerSample
word cbSize = 0x0600 //6 extra bytes of format info, not 22
word null1 = 0x0000
dword channelMask //Same as above
byte JUNK[4] = "JUNK"
dword junkSize = 0x04000000
dword null2 = 0x00000000
byte DATA[4] = "DATA"
dword dataSize
===Changing Format===
In order to modify the header of the sound file, a hex editor has to be used. HxD is recommended, but you can use the one of your preference. Do NOT try using Notepad.
For this example we will examine 164171.riff, which can be extracted from ''depot\version\eso0028.dat''.
Below, the first 64 bytes are listed in the unmodified header. The bytes that will be modified are indicated below:
52 49 46 46 <s>C4 09 AF 01</s> 57 41 56 45 66 6D 74 20 RIFFÄ.¯.WAVEfmt
<s>18</s> 00 00 00 FE FF 02 00 C0 5D 00 00 00 77 01 00 ....þÿ..À]...w..
04 00 10 00 <s>06</s> 00 <s>00 00</s> 03 00 00 00 <s>4A 55 4E 4B</s> ............JUNK
<s>04 00 00 00 00 00 00 00</s> 64 61 74 61 8C 09 AF 01 ........dataŒ.¯.
The modified version of this will be 68 bytes long:
52 49 46 46 <u>C8 09 AF 01</u> 57 41 56 45 66 6D 74 20 RIFFÄ.¯.WAVEfmt Size increased by 4 bytes
<u>28</u> 00 00 00 FE FF 02 00 C0 5D 00 00 00 77 01 00 (...þÿ..À]...w.. fmtSize increased from 0x18 to 0x28
04 00 10 00 <u>16</u> 00 <u>10 00</u> 03 00 00 00 <u>01 00 00 00</u> ................ cbSize increased from 0x06 to 0x16, null1 replaced with nValidBitsPerSample;
<u>00 00 10 00 80 00 00 AA 00 38 9B 71</u> 64 61 74 61 ....€..ª.8›qdata JUNK block replaced with subFormat
8C 09 AF 01 Œ.¯.
Finally, rename the file "164171.wav". Now you're good to go!
==Notes==
This conversion process is very crude, but it works for at least some files. Some files do not seem to work with this process, but it's possible that the header can be tweaked to fix these.
Although RIFF files are a very popular data type used for saving WAV files, those used in the game files have modified, shortened headers which cannot be interpreted by media players. This page describes the relatively simple procedure required to make these otherwise-normal WAV files readable by any media player.
==Header Format==
The files used are in the WAVE_FORMAT_EXTENSIBLE structure. All numerical values are little endian.
===Original Format===
The original header format for WAV files is as such:
byte RIFF[4] = "RIFF"
dword fileSize
byte WAVE[4] = "WAVE"
byte fmt_[4] = "fmt "
dword fmtSize = 0x28000000 //40 bytes
word fmtTag = 0xFEFF //WAVE_FORMAT_EXTENSIBLE
word nChannels
dword nSamplesPerSec
dword nAvgBytesPerSec
word nBlockAlign
word nBitsPerSample
word cbSize = 0x1600 //22 extra bytes of format info
word nValidBitsPerSample
dword channelMask //See below
byte subFormat[16] = 0x0100000000001000800000AA00389B71
byte DATA[4] = "DATA"
dword dataSize
For more info on ChannelMask, refer to [http://msdn.microsoft.com/en-us/library/windows/desktop/microsoft.directx_sdk.reference.waveformatextensible(v=vs.85).aspx this site].
===Game Format===
The header format for the extracted audio is slightly different:
byte RIFF[4] = "RIFF"
dword fileSize
byte WAVE[4] = "WAVE"
byte fmt_[4] = "fmt "
dword fmtSize = 0x18000000 //24 bytes, not 40
word fmtTag = 0xFEFF //WAVE_FORMAT_EXTENSIBLE
word nChannels
dword nSamplesPerSec
dword nAvgBytesPerSec
word nBlockAlign
word nBitsPerSample
word cbSize = 0x0600 //6 extra bytes of format info, not 22
word null1 = 0x0000
dword channelMask //Same as above
byte JUNK[4] = "JUNK"
dword junkSize = 0x04000000
dword null2 = 0x00000000
byte DATA[4] = "DATA"
dword dataSize
===Changing Format===
In order to modify the header of the sound file, a hex editor has to be used. HxD is recommended, but you can use the one of your preference. Do NOT try using Notepad.
For this example we will examine 164171.riff, which can be extracted from ''depot\version\eso0028.dat''.
Below, the first 64 bytes are listed in the unmodified header. The bytes that will be modified are indicated below:
52 49 46 46 <s>C4 09 AF 01</s> 57 41 56 45 66 6D 74 20 RIFFÄ.¯.WAVEfmt
<s>18</s> 00 00 00 FE FF 02 00 C0 5D 00 00 00 77 01 00 ....þÿ..À]...w..
04 00 10 00 <s>06</s> 00 <s>00 00</s> 03 00 00 00 <s>4A 55 4E 4B</s> ............JUNK
<s>04 00 00 00 00 00 00 00</s> 64 61 74 61 8C 09 AF 01 ........dataŒ.¯.
The modified version of this will be 68 bytes long:
52 49 46 46 <u>C8 09 AF 01</u> 57 41 56 45 66 6D 74 20 RIFFÄ.¯.WAVEfmt Size increased by 4 bytes
<u>28</u> 00 00 00 FE FF 02 00 C0 5D 00 00 00 77 01 00 (...þÿ..À]...w.. fmtSize increased from 0x18 to 0x28
04 00 10 00 <u>16</u> 00 <u>10 00</u> 03 00 00 00 <u>01 00 00 00</u> ................ cbSize increased from 0x06 to 0x16, null1 replaced with nValidBitsPerSample;
<u>00 00 10 00 80 00 00 AA 00 38 9B 71</u> 64 61 74 61 ....€..ª.8›qdata JUNK block replaced with subFormat
8C 09 AF 01 Œ.¯.
Finally, rename the file "164171.wav". Now you're good to go!
==Notes==
This conversion process is very crude, but it works for at least some files. Some files do not seem to work with this process, but it's possible that the header can be tweaked to fix these.