Формат заголовка .MP3-файлов

Info from: http://www.enlight.ru

Byte 0 Byte 1 Byte 2 Byte 3
---------T--------T--------T--------¬
¦76543210¦76543210¦76543210¦76543210¦
LTTTTTTTT+TTTTTTTT+TTTTTTTT+TTTTTTTT-
++++++++-++-+-+-¦ +++-+-¦¦ +-+-¦¦+-
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦¦L--- 00=Emphasis None
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦¦ 01=Emphasis 50/15 microseconds
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦¦ 10=Emphasis Dunno
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦¦ 11=Emphasis CITT j.17
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦¦
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦L---- 0=Original NO
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦ 1=Original YES
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ ¦
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ L----- 0=Copyright NO
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦ 1=Copyright YES
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ ¦
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦ L------- Смотри таблицу <<Mode extension>>
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ L--------- 00=Stereo
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ 01=Joint stereo
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ 10=Dual channel
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ 11=Single Channel (Mono)
¦ ¦ ¦ ¦ ¦ ¦ ¦¦
¦ ¦ ¦ ¦ ¦ ¦ ¦L----------- 0=Extension None
¦ ¦ ¦ ¦ ¦ ¦ ¦ 1=Extension Private
¦ ¦ ¦ ¦ ¦ ¦ ¦
¦ ¦ ¦ ¦ ¦ ¦ L------------ 0=Unused bits are filled (padding req.)
¦ ¦ ¦ ¦ ¦ ¦ 1=All bits in frame are used
¦ ¦ ¦ ¦ ¦ ¦
¦ ¦ ¦ ¦ ¦ L-------------- Смотри таблицу <<Sample Rate Index>>
¦ ¦ ¦ ¦ ¦
¦ ¦ ¦ ¦ L------------------ Смотри таблицу <<Bitrate>>
¦ ¦ ¦ ¦
¦ ¦ ¦ L-------------------- 0=Error Protection Bit CRC is ON
¦ ¦ ¦ 1=Error Protection Bit CRC is OFF
¦ ¦ ¦
¦ ¦ L---------------------- 00=Layer-?
¦ ¦ 01=Layer-3
¦ ¦ 10=Layer-2
¦ ¦ 11=Layer-1
¦ ¦
¦ L------------------------ 00=MPEG-2.5 (44100 Hz)
¦ 01=MPEG-?
¦ 10=MPEG-2.0 (22050 Hz)
¦ 11=MPEG-1.0 (11025 Hz)
¦
L------------------------------------ Sync Header, всегда 0xFFEx

 

Таблица SAMPLE RATE

MPEG-1 MPEG-2
г==T=====¬ г==T=====¬
·00¦44100· ·00¦22050·
·01¦48000· ·01¦24000·
·10¦32000· ·10¦16000·
·11¦?????· ·11¦?????· <=- ошибка "Stream error!"
L==¦=====- L==¦=====-

 

Таблица MODE EXTENSION

When encoding with joint stereo, this specifies to which freq. band it
is bound.

Layer-1,2 Layer-3
г==T==¬ г==T==¬
·00¦ 4· ·00¦ 0·
·01¦ 8· ·01¦ 4·
·10¦12· ·10¦ 8·
·11¦16· ·11¦16·
L==¦==- L==¦==-

 

Таблица BIT RATE (kBit/s)

MPEG-1 MPEG-2
г====T=====T=====T=====¬ г====T=====T=====T=====¬
· ¦38000¦44100¦48000· · ¦16000¦22050¦24000·
¦====+=====+=====+=====¦ ¦====+=====+=====+=====¦
·0000¦ 0 ¦ 0 ¦ 0 · ·0000¦ 0 ¦ 0 ¦ 0 ·
·0001¦ 32 ¦ 32 ¦ 32 · ·0001¦ 32 ¦ 8 ¦ 8 ·
·0010¦ 64 ¦ 48 ¦ 40 · ·0010¦ 48 ¦ 16 ¦ 16 ·
·0011¦ 96 ¦ 56 ¦ 48 · ·0011¦ 56 ¦ 24 ¦ 24 ·
·0100¦ 128 ¦ 64 ¦ 56 · ·0100¦ 64 ¦ 32 ¦ 32 ·
·0101¦ 160 ¦ 80 ¦ 64 · ·0101¦ 80 ¦ 40 ¦ 40 ·
·0110¦ 192 ¦ 96 ¦ 80 · ·0110¦ 96 ¦ 48 ¦ 48 ·
·0111¦ 224 ¦ 112 ¦ 96 · ·0111¦ 112 ¦ 56 ¦ 56 ·
·1000¦ 256 ¦ 128 ¦ 112 · ·1000¦ 128 ¦ 64 ¦ 64 ·
·1001¦ 288 ¦ 160 ¦ 128 · ·1001¦ 144 ¦ 80 ¦ 80 ·
·1010¦ 320 ¦ 192 ¦ 160 · ·1010¦ 160 ¦ 96 ¦ 96 ·
·1011¦ 352 ¦ 224 ¦ 192 · ·1011¦ 176 ¦ 112 ¦ 112 ·
·1100¦ 384 ¦ 256 ¦ 224 · ·1100¦ 192 ¦ 128 ¦ 128 ·
·1101¦ 416 ¦ 320 ¦ 256 · ·1101¦ 224 ¦ 144 ¦ 144 ·
·1110¦ 448 ¦ 384 ¦ 320 · ·1110¦ 256 ¦ 160 ¦ 160 ·
·1111¦ ??? ¦ ??? ¦ ??? · ·1111¦ ??? ¦ ??? ¦ ??? ·
L====¦=====¦=====¦=====- L====¦=====¦=====¦=====-

Layer 2/3 FrameSize=144*bps/Sample_Frequency+PaddingBit

Stereo Mono
MPEG 1.0 32 17
MPEG 2.x 17 09

А это описание инфоpмационного тэга, тоже должно пpигодиться:

 

Offset 00h db 'TAG' ;сигнатура информационного тэга
Offset 03h db rep 1Eh (ASCII) ;Hазвание 30 байт ASCII
Offset 21h db rep 1Eh (ASCII) ;Исполнитель 30 байт ASCII
Offset 3Fh db rep 1Eh (ASCII) ;Альбом 30 байт ASCII
Offset 5Dh db rep 04h (ASCII) ;Год 4 байта ASCII
Offset 61h db rep 1Eh (ASCII) ;Комментарий 30 байт ASCII
Offset 7Fh db ? ;Жанр

Коды жанров 0x00...147 :
Blues
Classic Rock
Country
Dance
Disco
Funk
Grunge
Hip-Hop
Jazz
Metal
New Age
Oldies
Other
Pop
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Techno
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Ska
Death Metal
Pranks
Soundtrack
Euro-Techno
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Trip-Hop
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Jazz+Funk
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Acid
House
Game
Sound Clip
Gospel
Noise
Alt. Rock
Bass
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Space
Meditative
Instrumental Pop
Instrumental Rock
Ethnic
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Darkwave
Techno-Industrial
Electronic
Pop-Folk
Eurodance
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Southern Rock
Comedy
Cult
Gangsta Rap
Top 40
Christian Rap
Pop/Funk
Jungle
Native American
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Showtunes
Trailer
Lo-Fi
Tribal
Acid Punk
Acid Jazz
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Musical
Rock & Roll
Hard Rock
Folk
Folk/Rock
National Folk
Swing
Fast-Fusion
Bebob
Latin
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Bluegrass
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Gothic Rock
Progressive Rock
Psychedelic Rock
Symphonic Rock
Slow Rock
Big Band
Chorus
Easy Listening
Acoustic
Humour
Speech
Chanson
Opera
Chamber Music
Sonata
Symphony
Booty Bass
Primus
Porn Groove
Satire
Slow Jam
Club
Tango
Samba
Folklore
Ballad
Power Ballad
Rhythmic Soul
Freestyle
Duet
Punk Rock
Drum Solo
A Cappella
Euro-House
Dance Hall
Goa
Drum & Bass
Club-House
Hardcore
Terror
Indie
BritPop
Negerpunk
Polsk Punk
Beat
Christian Gangsta Rap
Heavy Metal
Black Metal
Crossover
Contemporary Christian
Christian Rock
Merengue
Salsa
Thrash Metal
Anime
JPop
Synthpop

148...254 -- зарезервированы
255 -- отсутствует