WAVE File Format (WAV)

1 Reading and Writing

3 Binary Classes

WAVE File Format (WAV)

1Reading and Writing

wave-sample-rate

in-wave-channel

3Binary Classes

wave:format:extensible%

wave:format:extended%

8.18

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WAVE File Format (WAV)🔗 i

(require binary-class/wave ) package: binary-class-riff

This module provides utilities for reading and writing WAVE files.

Some of the more advanced features of the format are not implemented; let me know if you need them!

1Reading and Writing🔗 i

procedure
( read-wave [in])→wave?
in:input-port? =(current-input-port )

Reads WAVE data from in and returns it.

procedure
( write-wave wav[out])→void?
wav:wave?
out:output-port? =(current-output-port )

Writes the WAVE object wav to out.

2Utilities🔗 i

procedure
( wave? v)→boolean?
v:any/c

Predicate for WAVE data. Equivalent to (and (is-a? vriff:list% )(bytes=? #"WAVE"(get-field typev))).

procedure
( wave-bits wav)→exact-positive-integer?
wav:wave?

Returns the number of bits per sample of wav.

procedure
( wave-channels wav)→exact-positive-integer?
wav:wave?

Returns the number of channels in wav.

procedure
( wave-sample-rate wav)→exact-positive-integer?
wav:wave?

Returns the sample rate of wav.

procedure
( wave-format wav)→(is-a?/c wave:format% )
wav:wave?

Returns the format chunk of wav. An exception will be raised if none is found.

procedure
( in-wave-channel wavch)→sequence?
wav:wave?
ch:exact-nonnegative-integer?

Returns a sequence consisting of the samples of channel number ch in wav.

procedure
( in-wave wav)→sequence?
wav:wave?

Returns a sequence consisting of the samples of wav. Each element of the sequence has as many values as there are channels.

3Binary Classes🔗 i

class
wave:format% :class?

superclass:riff%

A type representing the WAVE format chunk.

constructor
( new wave:format%
[format-tagformat-tag]
[channelschannels]
[samples-per-secsamples-per-sec]
[avg-bytes-per-secavg-bytes-per-sec]
[block-alignblock-align]
[bits-per-samplebits-per-sample])
→(is-a?/c wave:format% )
format-tag:exact-nonnegative-integer?
channels:exact-positive-integer?
samples-per-sec:exact-positive-integer?
avg-bytes-per-sec:exact-positive-integer?
block-align:exact-positive-integer?
bits-per-sample:exact-positive-integer?

class
wave:format:extensible% :class?

superclass:wave:format%

Represents extensible format data.

constructor
( new wave:format:extensible%
[extension-sizeextension-size]
...superclass-args...)
→(is-a?/c wave:format:extensible% )
extension-size:exact-nonnegative-integer?

class
wave:format:extended% :class?

superclass:wave:format:extensible%

Represents extended format data.

constructor
( new wave:format:extended%
[valid-bits-per-samplevalid-bits-per-sample]
[channel-maskchannel-mask]
[sub-formatsub-format]
...superclass-args...)
→(is-a?/c wave:format:extended% )
valid-bits-per-sample:exact-nonnegative-integer?
channel-mask:exact-nonnegative-integer?
sub-format:bytes?

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