Module codecs 

OGG Vorbis and MP3 audio decoders (integer-only, no_std)

Provides software decoding of OGG Vorbis and MPEG-1 Layer III (MP3) audio streams using only integer and fixed-point arithmetic. No floating-point operations are used, making these decoders suitable for kernel context where FPU state may not be available.

Fixed-Point Formats

• 16.16: General-purpose, used for volume/gain. 1.0 = 0x0001_0000.
• 2.30: High-precision twiddle factors for MDCT/IMDCT. 1.0 = 0x4000_0000.

OGG Vorbis

Implements the OGG container (RFC 3533) and Vorbis I codec (Xiph.org spec):

• OGG page parsing with CRC32 verification
• Vorbis identification, comment, and setup header decoding
• Floor type 1, residue types 0/1/2, codebook Huffman trees
• MDCT via integer butterfly operations with 2.30 twiddle factors
• Vorbis window function via fixed-point lookup table

MP3 (MPEG-1 Layer III)

Implements ISO 11172-3 / ISO 13818-3 Layer III decoding:

• Frame sync and header parsing (bitrate, sample rate, channel mode)
• Side information and scalefactor band decoding
• Huffman decoding (33 tables)
• Integer requantization via lookup tables
• Joint stereo (MS and intensity)
• 36-point and 12-point IMDCT via integer butterflies
• 32-subband synthesis polyphase filterbank (integer coefficients)

Re-exports

pub use mp3::*;

pub use vorbis::*;

Modules

mp3

MP3 (MPEG-1 Layer III) decoder (integer-only, no_std)

vorbis

OGG Vorbis decoder (integer-only, no_std)

Enums

CodecError

Error type for codec operations

Type Aliases

CodecResult

Codec result type