Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = "myaudio.dat"
f = open(name,'rb')
f.seek(0)
chain = "< 4s 4s I 4s I 20s I I i 4s I 67s s 4s I"
s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1+4*1+67*1+1+4*1+4*1)
a = struct.unpack(chain, s)
header = {'identifier' : a[0],
'cid' : a[1],
'clength' : a[2],
'hident' : a[3],
'hcid32' : a[4],
'hdate' : a[5],
'sampling' : a[6],
'length_B' : a[7],
'max_cA' : a[8],
'max_cA1' : a[9],
'identNOTE' : a[10],
'c2len' : a[11],}
It produces:
{'length_B': 150001, 'sampling': 50000, 'max_cA1': 'NOTE', 'hident': 'HEDR',
'c2len': "Normal Sustained Vowel 'A', Voice and Speech Lab., MEEI, Boston,
MA", 'hdate': 'Jul 13 11:57:41 1994', 'identNOTE': 68, 'max_cA': -44076,
'cid': 'DS16', 'hcid32': 32, 'identifier': 'FORM', 'clength': 300126}
So far when I run f.tell()
>>f.tell()
136L
The audio data length is 300126, now I need a clue to build an array with
the audio data (The Chunk SDA_), would it possible with struct?, any help ?
Thanks
The file format is:
Offset | Length | Type | Contents
0 4 character Identifier: "FORM"
4 4 character Chunk identifier: "DS16"
8 4 integer Chunk length
12 - - Chunk data
Header 2
Offset Length Type Contents
0 4 character Identifier: "HEDR" or "HDR8"
4 4 integer Chunk length (32)
8 20 character Date, e.g. "May 26 23:57:43 1995"
28 4 integer Sampling rate
32 4 integer Data length (bytes)
36 2 unsigned integer Maximum absolute value for channel A:
0xFFFF if not defined
38 2 unsigned integer Maximum absolute value for channel A:
0xFFFF if not defined
NOTE Chunk
Offset Length Type Contents
0 4 character Identifier: "NOTE"
4 4 integer Chunk length
8 - character Comment string
SDA_, SD_A or SDAB Chunk
Offset Length Type Contents
0 4 character Identifier: "SDA_", "SD_B", or "SDAB"
4 4 integer Chunk length
8 - - Data
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