Yate: DataTranslator Class Reference

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DataTranslator Class Reference

An unidirectional data translator (codec) More...

`#include <yatephone.h>`

Inheritance diagram for DataTranslator:

## Public Member Functions
| DataTranslator (const char *sFormat, const char *dFormat)
| DataTranslator (const char *sFormat, DataSource *source=0)
| ~DataTranslator ()
virtual void * | getObject (const String &name) const
virtual bool | valid () const
virtual DataSource * | getTransSource () const
DataTranslator * | getFirstTranslator ()
const DataTranslator * | getFirstTranslator () const
Public Member Functions inherited from DataConsumer
| DataConsumer (const char *format="slin")
virtual void | destroyed ()
virtual unsigned long | Consume (const DataBlock &data, unsigned long tStamp, unsigned long flags)=0
DataSource * | getConnSource () const
DataSource * | getOverSource () const
Public Member Functions inherited from DataNode
| DataNode (const char *format=0)
virtual int | costFormat (const DataFormat &format)
virtual bool | setFormat (const DataFormat &format)
const DataFormat & | getFormat () const
unsigned long | timeStamp () const
virtual bool | control (NamedList &params)
virtual void | attached (bool added)
Public Member Functions inherited from RefObject
| RefObject ()
virtual | ~RefObject ()
virtual bool | alive () const
bool | ref ()
bool | deref ()
int | refcount () const
virtual void | destruct ()
Public Member Functions inherited from GenObject
| GenObject ()
virtual | ~GenObject ()
virtual const String & | toString () const
NamedCounter * | getObjCounter () const
NamedCounter * | setObjCounter (NamedCounter *counter)

## Static Public Member Functions
static ObjList * | srcFormats (const DataFormat &dFormat="slin", int maxCost=-1, unsigned int maxLen=0, ObjList *lst=0)
static ObjList * | destFormats (const DataFormat &sFormat="slin", int maxCost=-1, unsigned int maxLen=0, ObjList *lst=0)
static ObjList * | allFormats (const ObjList *formats, bool existing=true, bool sameRate=true, bool sameChans=true)
static ObjList * | allFormats (const String &formats, bool existing=true, bool sameRate=true, bool sameChans=true)
static bool | canConvert (const DataFormat &fmt1, const DataFormat &fmt2="slin")
static int | cost (const DataFormat &sFormat, const DataFormat &dFormat)
static DataTranslator * | create (const DataFormat &sFormat, const DataFormat &dFormat)
static bool | attachChain (DataSource *source, DataConsumer *consumer, bool override=false)
static bool | detachChain (DataSource *source, DataConsumer *consumer)
static void | setMaxChain (unsigned int maxChain)
Static Public Member Functions inherited from DataNode
static unsigned long | invalidStamp ()
Static Public Member Functions inherited from RefObject
static bool | alive (const RefObject *obj)
static bool | efficientIncDec ()
Static Public Member Functions inherited from GenObject
static void * | getObject (const String &name, const GenObject *obj)
static bool | getObjCounting ()
static void | setObjCounting (bool enable)
static NamedCounter * | getObjCounter (const String &name, bool create=true)
static ObjList & | getObjCounters ()

## Protected Member Functions
ObjList * | getConsumers () const
virtual bool | synchronize (DataSource *source)
Protected Member Functions inherited from RefObject
virtual void | zeroRefs ()
bool | resurrect ()

## Static Protected Member Functions
static void | install (TranslatorFactory *factory)
static void | uninstall (TranslatorFactory *factory)

## Friends
class | TranslatorFactory

## Additional Inherited Members
Public Types inherited from DataNode
enum | DataFlags { DataStart = 0x0001, DataEnd = 0x0002, DataMark = 0x0004, DataSilent = 0x0008, DataMissed = 0x0010, DataError = 0x0020, DataPrivate = 0x0100 }
Protected Attributes inherited from DataNode
DataFormat | m_format
unsigned long | m_timestamp

## Detailed Description

An unidirectional data translator (codec)

The DataTranslator holds a translator (codec) capable of unidirectional conversion of data from one type to another.

## Constructor & Destructor Documentation

DataTranslator | ( | const char * | sFormat,
|  | const char * | dFormat
| ) |  |

Construct a data translator.

Parameters

  sFormat | Name of the source format (data received from the consumer)
  dFormat | Name of the destination format (data supplied to the source)

DataTranslator | ( | const char * | sFormat,
|  | DataSource * | source = `0`
| ) |  |
| explicit

Creates a data translator from an existing source, does not increment the source's reference counter.

Parameters

  sFormat | Name of the source format (data received from the consumer)
  source | Optional pointer to a DataSource object

~DataTranslator | ( |  | ) |

Destroys the translator and its source

## Member Function Documentation

static ObjList* allFormats | ( | const ObjList * | formats,
|  | bool | existing = `true`,
|  | bool | sameRate = `true`,
|  | bool | sameChans = `true`
| ) |  |
| static

Get a list of formats supported by transcoding for a given format list

Parameters

  formats | List of data format names
  existing | Also return formats already existing in the initial list
  sameRate | Only return formats with same sampling rate
  sameChans | Only return formats with same number of channels

Returns
  List of format names, must be freed by the caller

static ObjList* allFormats | ( | const String & | formats,
|  | bool | existing = `true`,
|  | bool | sameRate = `true`,
|  | bool | sameChans = `true`
| ) |  |
| static

Get a list of formats supported by transcoding for a given format list

Parameters

  formats | Data format names as comma separated list
  existing | Also return formats already existing in the initial list
  sameRate | Only return formats with same sampling rate
  sameChans | Only return formats with same number of channels

Returns
  List of format names, must be freed by the caller

static bool attachChain | ( | DataSource * | source,
|  | DataConsumer * | consumer,
|  | bool | override = `false`
| ) |  |
| static

Attach a consumer to a source, possibly trough a chain of translators

Parameters

  source | Source to attach the chain to
  consumer | Consumer where the chain ends
  override | Attach chain for temporary source override

Returns
  True if successfull, false if no translator chain could be built

static bool canConvert | ( | const DataFormat & | fmt1,
|  | const DataFormat & | fmt2 = `"slin"`
| ) |  |
| static

Check if bidirectional conversion can be performed by installed translators

Parameters

  fmt1 | Name of the first data format
  fmt2 | Name of the second data format

Returns
  True if translators can be created for both directions

static int cost | ( | const DataFormat & | sFormat,
|  | const DataFormat & | dFormat
| ) |  |
| static

Finds the cost of a translator given the source and destination format names

Parameters

  sFormat | Name of the source format (data received from the consumer)
  dFormat | Name of the destination format (data supplied to the source)

Returns
  Cost of best (cheapest) codec or -1 if no known codec exists

static DataTranslator* create | ( | const DataFormat & | sFormat,
|  | const DataFormat & | dFormat
| ) |  |
| static

Creates a translator given the source and destination format names

Parameters

  sFormat | Name of the source format (data received from the consumer)
  dFormat | Name of the destination format (data supplied to the source)

Returns
  A pointer to a DataTranslator object or NULL if no known codec exists

static ObjList* destFormats | ( | const DataFormat & | sFormat = `"slin"`,
|  | int | maxCost = `-1`,
|  | unsigned int | maxLen = `0`,
|  | ObjList * | lst = `0`
| ) |  |
| static

Get a list of formats supported for a given input format

Parameters

  sFormat | Name of source format
  maxCost | Maximum cost of candidates to consider, -1 to accept all
  maxLen | Maximum length of codec chains to consider, 0 to accept all
  lst | Initial list, will append to it if not empty

Returns
  List of destination format names, must be freed by the caller

static bool detachChain | ( | DataSource * | source,
|  | DataConsumer * | consumer
| ) |  |
| static

Detach a consumer from a source, possibly trough a chain of translators

Parameters

  source | Source to dettach the chain from
  consumer | Consumer where the chain ends

Returns
  True if successfull, false if source and consumers were not attached

ObjList* getConsumers | ( |  | ) | const
| inlineprotected

Get access to the list of consumers of the data source

Returns
  Pointer to list entry of first consumer, NULL if none attached

References ObjList::skipNull().

DataTranslator* getFirstTranslator | ( |  | ) |

Get the first translator from a chain

Returns
  Pointer to the first translator in a chain

const DataTranslator* getFirstTranslator | ( |  | ) | const

Constant version to get the first translator from a chain

Returns
  Pointer to the first translator in a chain

virtual void* getObject | ( | const String & | name | ) | const
| virtual

Get a pointer to a derived class given that class name

Parameters

  name | Name of the class we are asking for

Returns
  Pointer to the requested class or NULL if this object doesn't implement it

Reimplemented from DataConsumer.

virtual DataSource* getTransSource | ( |  | ) | const
| inlinevirtual

Get the data source of a translator object

Returns
  A pointer to the DataSource object or NULL

Reimplemented from DataConsumer.

static void install | ( | TranslatorFactory * | factory | ) |
| staticprotected

Install a Translator Factory in the list of known codecs

Parameters

  factory | A pointer to a TranslatorFactory instance

Referenced by TranslatorFactory::TranslatorFactory().

static void setMaxChain | ( | unsigned int | maxChain | ) |
| static

Set the length of the longest translator chain we are allowed to create

Parameters

  maxChain | Desired longest chain length

static ObjList* srcFormats | ( | const DataFormat & | dFormat = `"slin"`,
|  | int | maxCost = `-1`,
|  | unsigned int | maxLen = `0`,
|  | ObjList * | lst = `0`
| ) |  |
| static

Get a list of formats supported for a given output format.

Parameters

  dFormat | Name of destination format
  maxCost | Maximum cost of candidates to consider, -1 to accept all
  maxLen | Maximum length of codec chains to consider, 0 to accept all
  lst | Initial list, will append to it if not empty

Returns
  List of source format names, must be freed by the caller

virtual bool synchronize | ( | DataSource * | source | ) |
| protectedvirtual

Synchronize the consumer with a source

Parameters

  source | Data source to copy the timestamp from

Returns
  True if we could synchronize with the source

Reimplemented from DataConsumer.

static void uninstall | ( | TranslatorFactory * | factory | ) |
| staticprotected

Remove a Translator Factory from the list of known codecs

Parameters

  factory | A pointer to a TranslatorFactory instance

virtual bool valid | ( |  | ) | const
| inlinevirtual

Check if the data translator has a valid source

Returns
  True if still valid, false if node should be removed

Reimplemented from DataNode.

References DataSource::valid().

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

- yatephone.h