دانلود کتاب Vorbis I Specification

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Www.xiph.org, 2011.Содержит описание формата сжатия аудиоданных Vorbis. На английском языке.
This document provides a high level description of the Vorbis codec’s construction. A bit-by-bit specification appears beginning in Section 4, Codec Setup and Packet Decode. The later sections assume a high-level understanding of the Vorbis decode process, which is provided here.
Vorbis is a general purpose perceptual audio CODEC intended to allow maximum encoder flexibility, thus allowing it to scale competitively over an exceptionally wide range of bitrates. At the high quality/bitrate end of the scale (CD or DAT rate stereo, 16/24 bits) it is in the same league as MPEG-2 and MPC. Similarly, the 1.0 encoder can encode high-quality CD and DAT rate stereo at below 48kbps without resampling to a lower rate. Vorbis is also intended for lower and higher sample rates (from 8kHz telephony to 192kHz digital masters) and a range of channel representations (monaural, polyphonic, stereo, quadraphonic, 5.1, ambisonic, or up to 255 discrete channels).Introduction and Description
Overview
Decoder Configuration
High-level Decode Process
Bitpacking Convention
Overview
octets, bytes and words
bit order
byte order
coding bits into byte sequences
signedness
coding example
decoding example
end-of-packet alignment
reading zero bits
Probability Model and Codebooks
Overview
Packed codebook format
Use of the codebook abstraction
Codec Setup and Packet Decode
Overview
Header decode and decode setup
Audio packet decode and synthesis
comment field and header specification
Overview
Comment encoding
Structure
Content vector format
Encoding
Floor type 0 setup and decode
Overview
Floor 0 format
header decode
packet decode
curve computation
Floor type 1 setup and decode
Overview
Floor 1 format
model
header decode
Residue setup and decode
Overview
Residue format
residue 0
residue 1
residue 2
Residue decode
header decode
packet decode
format 0 specifics
format 1 specifics
format 2 specifics
Helper equations
Overview
Functions
ilog
float32_unpack
lookup1_values
low_neighbor
high_neighbor
render_point
render_line
Tables
floor1_inverse_dB_table
Embedding Vorbis into an Ogg stream
Overview
Restrictions
MIME type
Encapsulation
Vorbis encapsulation in RTP