class AudioFile : public AudioData

AudioFile represents a SUN-au file

Inheritance:

AudioFile < AudioData

Public Methods

AudioFile(const AudioFile& aufile)

creates new AudioFile which encapsulates the same audio file as the specified object do

explicit AudioFile(const string& filename)

creates an instance of AudioFile for the SUN-au file having the given name

uint32 dataLocation()

returns the location of audio data in the file

uint32 headerID()

returns the header ID

size_t load(size_t samples)

Implementation of load for SUN-au files.

size_t loadSecs(size_t secs)

Implementation of loadSecs for SUN-au files.

void seek(int samples, SeekMode mode)

Implementation of seek for SUN-au files.

void seekSecs(int secs, SeekMode mode)

Implementation of seekSecs for SUN-au files.

void store(ofstream& file)

Implementation of store for SUN-au files.

~AudioFile()

destroy the object.

Protected Fields

static const int expLut[]

Conversion table: lin16 to expot.

static const Sample ulawTable[]

Conversion table: u-law to lin16.

uint32 vDataLocation

Position of audio data in the audio file.

uint32 vHeaderID

Header found in audio data.

Protected Methods

Sample calcSampAmp(Byte* buf)

converts sample amplitude stored in certain bytes to a single value

void calcSampCode(Sample samp, Byte* buf)

stores single sample into a buffer

void close()

Implementation of close for SUN-au files.

bool isSND(Byte header[4])

checks if the given array contains the SND-header

Byte lin2ulaw(Sample sample)

converts a Sample value to u-law value

void open(const string& filename)

Implementation of open for SUN-au files.

uint32 packBytes(Byte* bytes)

converts an integer stored in a 4 byte buffer in a 32 bit unsigned integer value

Byte* swapInt32(Byte cp[4])

swap the array contents: [0,1,2,3] is now [3,2,1,0]

Sample ulaw2lin(int i)

converts a u-law value to Sample format

Inherited from AudioData:

Public Classes

enum SeekMode

Public Methods

uint32 bytesInSample()

AudioCache& cache()

const AudioCache& cache()

uint32 channelCount()

FormatCode dataFormat()

uint32 dataSize()

const string filename()

const string info()

AudioData& operator=(const AudioData& audata)

virtual void printOn(ostream& os)

uint32 samplingRate()

Public

enum SeekMode

Protected Fields

mutable ifstream file

uint32 vBytesInSample

mutable AudioCache* vCache

uint32 vChannelCount

FormatCode vDataFormat

uint32 vDataSize

string vFilename

string vInfo

uint32 vSamplingRate

explicit AudioFile(const string& filename)

creates an instance of AudioFile for the SUN-au file having the given name.

Throws:

Exception , if reading faild

Parameters:

filename - name of a SUN-au file

AudioFile(const AudioFile& aufile)

creates new AudioFile which encapsulates the same audio file as the specified object do.

Parameters:

aufile - other AudioFile object

~AudioFile()

destroy the object.

size_t load(size_t samples)

Implementation of load for SUN-au files.

size_t loadSecs(size_t secs)

Implementation of loadSecs for SUN-au files.

void seek(int samples, SeekMode mode)

Implementation of seek for SUN-au files.

void seekSecs(int secs, SeekMode mode)

Implementation of seekSecs for SUN-au files.

void store(ofstream& file)

Implementation of store for SUN-au files.

uint32 headerID()

returns the header ID.

Returns:

ID (4 byte unsinged)

uint32 dataLocation()

returns the location of audio data in the file.

Returns:

absolute position in bytes

void open(const string& filename)

Implementation of open for SUN-au files.

void close()

Implementation of close for SUN-au files.

Sample calcSampAmp(Byte* buf)

converts sample amplitude stored in certain bytes to a single value.

Throws:

Exception , if there is no conversion method for the data format

Returns:

single amplitude value

Parameters:

buf - buffer where the sample is stored

Sample ulaw2lin(int i)

converts a u-law value to Sample format.

Returns:

Sample value

Parameters:

i - u-law value

void calcSampCode(Sample samp, Byte* buf)

stores single sample into a buffer.

Throws:

Exception , if there is no conversion method for the data format

Parameters:

samp - single sample
buf - array of bytes

Byte lin2ulaw(Sample sample)

converts a Sample value to u-law value.

Returns:

8 bit u-law sample

Parameters:

sample - 16 bit linear sample

uint32 packBytes(Byte* bytes)

converts an integer stored in a 4 byte buffer in a 32 bit unsigned integer value.

Returns:

32 bit unsigned integer

Parameters:

bytes - array containing 4 bytes

Byte* swapInt32(Byte cp[4])

swap the array contents: [0,1,2,3] is now [3,2,1,0].

Returns:

swapped array

Parameters:

cp - array containing 4 bytes

bool isSND(Byte header[4])

checks if the given array contains the SND-header.

Returns:

true if header is SND-header

Parameters:

header - array containing 4 bytes

uint32 vHeaderID

Header found in audio data.

uint32 vDataLocation

Position of audio data in the audio file.

static const Sample ulawTable[]

Conversion table: u-law to lin16.

static const int expLut[]

Conversion table: lin16 to expot.

Author:

Silvia Pfeiffer, Peter Tomczyk

Version:

$Id: aufile.h,v 1.8 1998/04/14 10:26:27 tomczyk Exp $

alphabetic index hierarchy of classes

this page has been generated automatically by doc++

(c)opyright by Malte Zöckler, Roland Wunderling
contact: doc++@zib.de