Qcp File Format Parsing

General View of qcp subchunks

<Qlcm-form>
Riff ('qlcm'
<Format chunk 'fmt'> // required
[<Variable Rate chunk-'vrat'>] // required
[<Label chunk 'labl'>] // optional
[<Offsets in increments chunk-'offs'>] // optional

<Codec packet data chunk-'data'> // required
[<Configuration chunk-'cnfg'>] // optional
[<Text chunk-'text'>] // optional
)

Detailed view of qcp subchunks

Riff 'qlcm '{
Byte [4] id = {'R', 'I', 'F', 'F '}
Uint32 size = size of riff chunk excluding ID and size
Byte [4] = {'Q', 'l', 'C', 'M '}

<Format chunk-'fmt'> {
Byte [4] id = {'F', 'M','t ',''}
Uint32 size = size of 'fmt' subchunk excluding ID and
Size
Byte mjv = major version of this format (see note 1)
Byte mnv = minor version of this format (see note 1)
Struct type_qpl_info {
Struct guid {
Uint32 data1;
Uint16 data2;
Uint16 data3;
Byte data4 [8];
} = ID; // unique ID of this
// Codec
Uint16 version; // version # Of
// Codec
Byte name [80]; // proper name of
// Codec
Uint16 avgbitspersec; // avg bps of
// Codec
Uint16 bytesperpacket; // size of a packet in
// Bytes (max rate)
// Including Header
// Byte for that
// Packet
Uint16 samplesperblock; // size of a block in
// Samples
// Encoder encodes one
// Block into one
// Packet
// Decoder decodes one
// Packet into one
// Block
Uint16 samplespersec; // SPS of input needed
// For The Encoder
// And output from the decoder

Uint16 bitspersample; // bits per sample
// The above
// Contains rate Header Format info
Struct type_qpl_variable_rate {
Uint32 numofrates; // # of Rates
// High byte = rate, low byte = size of following
// Packet
Uint16 bytesperpacket [8];
} = Variablerate;

Uint32 reserved [5]; // Reserved
} = Codec info
}
<Variable Rate chunk-'vrat'> {
Byte [4] id = {'V', 'R', 'A','t '}
Uint32 size = size of 'vrat' subchunk excluding ID and size
Uint32 variablerate;
// If (= 0) packet data is fixed rate
// Else if (<0xffff0000) Variable Rate
Uint32 sizeinpackets;
// The data chunk size in packets
}
[<Label chunk-'labl'>] // see optional chunks
[<Offsets in increments chunk-'offs'>] // see optional chunks
<Codec packet data chunk-'data'> {
Byte [4] id = {'D', 'A', 't', 'A '}
Uint32 size = size of 'data' subchunk excluding ID and size
Byte [] = actual packet data (see note 2)
}
[<Configuration chunk-'cnfg'>] // see optional chunks
[<Text chunk-'text'>] // see optional chunks
}