Xing MP3 Encoder 1.5 Full Version
examples: V0 and q0 = 100 - 10 * 0 - 0 = 100 => 64h V0 and q2 = 100 - 10 * 0 - 2 = 98 => 62h V2 and q5 = 100 - 10 * 2 - 5 = 75 => 4Bh V9 and q9 = 100 - 10 * 9 - 9 = 1 => 01h bytes $9A-$A4 Encoder short VersionString 9 characters examples: "LAME3.90a" : LAME version 3.90 alpha "GOGO3.02b" : GOGO version 3.02 beta byte $A5 Info Tag revision + VBR method two 4 bits fields: 4 MSB: Info Tag revision, range 0d-15d Possible values: 0: rev0 1: rev1 15: reserved
4 LSB: VBR Method, range 0d-15d Indicate the VBR method used for encoding. Possible values:
0d unknown 1d constant bitrate 2d restricted VBR targetting a given average bitrate (ABR) 3d full VBR method1 4d full VBR method2 5d full VBR method3 6d full VBR method4 7d 8d constant bitrate 2 pass 9d abr 2 pass 10d 11d 12d 13d 14d 15d reserved In case of Lame, the meaning is the following: 2: abr 3: vbr old / vbr rh 4: vbr mtrh 5: vbr mt
Xing MP3 Encoder 1.5 Full Version
byte $A5 = 03h = 0001 0011b => 4 MSB = 0001b =1d : LAME Tag revision 1
4 LSB = 0011b = 3d : vbr-old / vbr-rh
byte $A5 = 35h = 0011 0101b => 4 MSB = 0011b = 3d : LAME Tag revision 3
4 LSB = 0101b = 5d : vbr-new / vbr-mt
byte $A6 Lowpass filter value int lowpass = (lowpass value) / 100 range: 01h = 01d : 100Hz -> FFh = 255d : 25500Hz value 00h => unknown examples: byte $A6 = C3h C3h = 195d : 19500Hz byte $A6 = 78h 78h = 120d : 12000Hz bytes $A7-$AF Replay Gain as defined here: by David Robinson three fields: bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" 32 bit floating point. 00h00h00h00h : unknown
1.0 is maximal signal amplitude storeable in decoding format. 0.8 is 80% of maximal signal amplitude storeable in decoding format. 1.5 is 150% of maximal signal amplitude storeable in decoding format. info + examples: will follow byte $AB-$AC : 16 bit "Radio Replay Gain" field, required to make all tracks equal loudness.
from djmrob/replaygain/rg_data_format.html bits 0h-2h: NAME of Gain adjustment: 000 = not set 001 = radio 010 = audiophile (see - room for plenty more!) bits 3h-5h: ORIGINATOR of Gain adjustment: 000 = not set 001 = set by artist 010 = set by user 011 = set by my model 100 = set by simple RMS average etc etc (see - room for plenty more again!) bit 6h: Sign bit bits 7h-Fh: ABSOLUTE GAIN ADJUSTMENT storing 10x the adjustment (to give the extra decimal place). byte $AD-AE : 16 bit "Audiophile Replay Gain" field, required to give ideal listening loudness
from djmrob/replaygain/rg_data_format.html bits 0h-2h: NAME of Gain adjustment: 000 = not set 001 = radio 010 = audiophile (see - room for plenty more!) bits 3h-5h: ORIGINATOR of Gain adjustment: 000 = not set 001 = set by artist 010 = set by user 011 = set by my model 100 = set by simple RMS average etc etc (see - room for plenty more again!) bit 6h: Sign bit bits 7h-Fh: ABSOLUTE GAIN ADJUSTMENT storing 10x the adjustment (to give the extra decimal place). byte $AF Encoding flags + ATH Type two 4 bits fields: 4 MSB: 4 encoding flags
000? LAME uses "--nspsytune", ? = 0 : false ? = 1 : true 00?0 LAME uses "--nssafejoint" ? = 0 : false ? = 1 : true 0?00 This track is --nogap continued in a next track ? = 0 : false ? = 1 : true is true for all but the last track in a --nogap album ?000 This track is the --nogap continuation of an earlier one ? = 0 : false ? = 1 : true is true for all but the first track in a --nogap album 4 LSB: LAME ATH Type, range 0d-15d
examples: byte $AF = 03h = 0000 0011b => 4 MSB = 0000b = 0d : LAME does NOT use --nspsytune, LAME does NOT use --nssafejoint
4 LSB = 0011b = 3d : ATH type 3 used
byte $AF = 15h = 0001 0101b => 4 MSB = 0001b = 3d : LAME does use --nspsytune, LAME does NOT use --nssafejoint
4 LSB = 0101b = 5d : ATH type 5 used
byte $B0 if ABR specified bitrate else minimal bitrateIF the file is an ABR file: range: 01h = 01d : 1 kbit/s (--abr 1) -> FFh = 255d : 255 kbit/s or larger (--abr 255) value 00h => unknown examples: byte $B0 = C3h C3h = 195d : --abr 195 byte $B0 = 78h 78h = 128d : --abr 128 byte $B0 = FEh FEh = 254d : --abr 254 byte $B0 = FFh FEh = 255d : --abr 255 or higher, eg: --abr 280 IF the file is NOT an ABR file: (CBR/VBR) the (CBR)/(minimal VBR (-b)) bitrate is stored here 8-255. 255 if bigger. examples: "LAME -V0 -b224" will store (224)d=(E0)h
"LAME -b320" will store (255)d=(FF)h
bytes $B1-$B3 Encoder delays store in 3 bytes: [xxxxxxxx][xxxxyyyy][yyyyyyyy] the 12 bit values (0-4095) of how many samples were added at start (encoder delay) in X and how many 0-samples were padded at the end in Y to complete the last frame. so ideally you could do: #frames*(#samples/frame)-(these two values) = exact number of samples in original wav. so worst case scenario you'd have a 48kHz file which would give it a range of 0.085s at the end and at the start. example: [01101100][00010010][11010010] X = (011011000001)b = (1729)d, so 1729 samples is the encoder delay Y = (001011010010)b = (722)d, so 722 samples have been padded at the end of the file byte $B4 Misc 2 lsb I'd like to add the different noise shapings also in a 2-bit field (0-3) (00)b: noise shaping: 0 (01)b: noise shaping: 1 (10)b: noise shaping: 2 (11)b: noise shaping: 3 3 bits Stereo mode msb fist: (000)b: (m)ono (001)b: (s)tereo (010)b: (d)ual (011)b: (j)oint (100)b: (f)orce (101)b: (a)uto (110)b: (i)ntensity (111)b: (x)undefined / different 1 bit unwise settings used (0)b: no (1)b: yes (definition encoder side(*)) 2 msb Source (not mp3) sample frequency (00)b: 32kHz or smaller (01)b: 44.1kHz (10)b: 48kHz (11)b: higher than 48kHz (*)some settings were used which would likely damage quality in normal circumstances. (like disabling all use of the ATH or forcing only short blocks, -b192 ...) byte $B5 MP3 Gain any mp3 can be amplified by a factor 2 ^ ( x * 0.25) in a lossless manner by a tool like eg. mp3gain byte $B5 is set to (00)h by default. if done so, this 8-bit field can be used to log such transformation happened so that any given time it can be undone. WARNING: Do NOT alter this field if you do not fully understand its use. You will damage the Replaygain fields and musicCRC if you do not implement this correctly. You can only modify this field if the TagCRC checks out
you update all three the ReplayGain fields with the correct number of 1.5dB steps
the TagCRC is updated after all this
Do NOT change/update the musicCRC. It will be invalid after you change this mp3gain field. If an application like mp3gain changes the main music frames of the mp3 then the musicCRC should be invalid. The Lame Tag CRC should still be valid however (it could be updated by mp3gain). only tools like mp3gain should use this field, as it is made for making lossless adjustments to the mp3 after encoding is finished. No need to support this in LAME or any decoder at all. 2^(a/4) , range of "a" here: -127..0..127 [byte $B5]b a dB change amplification factor used was [11111111] -127 -190.5dB 0.000000000276883 ... ... [10000011] -3 -4.5dB 0.594603557501360533 [10000010] -2 -3dB 0.707106781186547524 [10000001] -1 -1.5dB 0.840896415253714543 [00000000] 0 0dB 1.0 [00000001] 1 +1.5dB 1.18920711500272107 [00000010] 2 +3dB 1.41421356237309505 [00000011] 3 +4.5dB 1.68179283050742909 [00000100] 4 +6dB 2.0 [00000101] 5 +7.5dB 2.37841423000544213 ... ... [00011111] 31 +46.5dB 215.269482304950923 ... ... [01111111] 127 +190.5dB 3611622602.83833951 the +-190.5dB range is too large, but there was little else to do with the extra bits, so for uniformity we took this range. bytes $B6-$B7 Preset and surround info 2 most significant bits: unused 350c69d7ab
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