class WahWah::Mp3::VbriHeader
VBRI header structure:
Position Length Meaning 0 4 VBR header ID in 4 ASCII chars, always 'VBRI', not NULL-terminated
4 2 Version ID as Big-Endian 16-bit unsigned
6 2 Delay as Big-Endian float
8 2 Quality indicator
10 4 Number of Bytes as Big-Endian 32-bit unsigned
14 4 Number of Frames as Big-Endian 32-bit unsigned
18 2 Number of entries within TOC table as Big-Endian 16-bit unsigned
20 2 Scale factor of TOC table entries as Big-Endian 32-bit unsigned
22 2 Size per table entry in bytes (max 4) as Big-Endian 16-bit unsigned
24 2 Frames per table entry as Big-Endian 16-bit unsigned
26 TOC entries for seeking as Big-Endian integral.
From size per table entry and number of entries, you can calculate the length of this field.
Constants
- HEADER_FORMAT
- HEADER_SIZE
Attributes
Public Class Methods
# File lib/wahwah/mp3/vbri_header.rb, line 37 def initialize(file_io, offset = 0) file_io.seek(offset) @id, @bytes_count, @frames_count = file_io.read(HEADER_SIZE)&.unpack(HEADER_FORMAT) end
Public Instance Methods
# File lib/wahwah/mp3/vbri_header.rb, line 42 def valid? @id == 'VBRI' end