AudioProcess Class Reference

#import <AudioProcess.h>

List of all members.

Public Member Functions
(AudioProcess *)	- clone
(NSArray *)	- processOriginal:
(BOOL)	- feedData:size:channels:bitsPerChannel:at:duration:
(uint64_t)	- lastMatchTimestamp
(void)	- _reset
	Internal: reset internal variables to prepare for new match.
Protected Attributes
BOOL	wasNoisy
	true if the previous buffer ended noisily
double	prevEnergy
	amount of energy in previous buffer
uint64_t	matchTimestamp
	timestamp of most recent match
Properties
NSArray *	originalSignature

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Detailed Description

Object that does pattern-matching on audio data to compare it to a known audio sample.

The current implementation is very simple-minded: it looks for a bit of noise in an otherwise quiet sample.

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Member Function Documentation

- (BOOL) feedData:		(void *)	buffer
size:		(size_t)	size
channels:		(int)	channels
bitsPerChannel:		(int)	nBits
at:		(uint64_t)	now
duration:		(uint64_t)	duration

Feed audio data into the matcher.

Parameters:

buffer	memory buffer containing audio data (16 bit signed linear PCM)
size	size of buffer, in bytes
channels	number of channels (can be 1 or 2)
now	timestamp corresponding to first sample in buffer

Returns:

true if a copy of sample fed into processOriginal has been found (either now or earlier). Once this method returns true you can use lastMatchTimestamp to obtain the timestamp of the match.

- (uint64_t) lastMatchTimestamp

Timestamp (in feedData terms) of match that corresponds to the beginning of the sample fed to processOriginal.

- (NSArray *) processOriginal:

(NSURL *)

fileURL

Primes the audio processor to detect copies of this sample.

Parameters:

fileURL

File containing original audio sample

Returns:

the signature of the audio file.

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The documentation for this class was generated from the following files:

• src/AudioRun/AudioProcess.h
• src/AudioRun/AudioProcess.m