AudioStreamInfo describes an elementary audio stream. More...

Inherits StreamInfo.

Public Member Functions
virtual int32_t	pcmFlags () const =0
	Returns the audio format flags which describe various properties of the audio stream. More...

virtual void	setPcmFlags (int32_t flags)=0
	Sets the audio format flags which describe various properties of the audio stream. More...

virtual int32_t	channels () const =0
	Returns the number of audio channels. More...

virtual void	setChannels (int32_t numChannels)=0
	Sets the number of audio channels. More...

virtual int32_t	channelLayout () const =0
	Returns the channel layout which defines the mapping between channels and speakers. More...

virtual void	setChannelLayout (int32_t channelLayout)=0
	Sets the channel layout which defines the mapping between channels and speakers. More...

virtual int32_t	sampleRate () const =0
	Returns the audio sample rate. More...

virtual void	setSampleRate (int32_t sampleRate)=0
	Sets the audio sample rate. More...

virtual int32_t	bitsPerSample () const =0
	Returns the number of bits per sample (sample resolution). More...

virtual void	setBitsPerSample (int32_t bitsPerSample)=0
	Sets the number of bits per sample (sample resolution). More...

virtual int32_t	bytesPerFrame () const =0
	Returns the number of bytes occupied by an audio frame (smallest discrete unit). More...

virtual void	setBytesPerFrame (int32_t bytesPerFrame)=0
	Sets the number of bytes occupied by an audio frame (smallest discrete unit). More...

virtual bool_t	copyTo (AudioStreamInfo *destination) const =0
	Copies the state of the current object to a destination object of the same type. More...

virtual AudioStreamInfo *	clone () const =0
	Creates a copy of this object. More...

Public Member Functions inherited from StreamInfo
virtual MediaType::Enum	mediaType () const =0
	Returns the stream media type. More...

virtual StreamType::Enum	streamType () const =0
	Returns the stream type. More...

virtual void	setStreamType (StreamType::Enum type)=0
	Sets the stream type. More...

virtual StreamSubType::Enum	streamSubType () const =0
	Returns the stream subtype. More...

virtual void	setStreamSubType (StreamSubType::Enum type)=0
	Sets the stream subtype. More...

virtual double	duration () const =0
	Returns the stream duration. More...

virtual void	setDuration (double duration)=0
	Sets the stream duration in seconds. More...

virtual int32_t	ID () const =0
	Returns the ID of the elementary stream. More...

virtual void	setID (int32_t id)=0
	Sets the ID of the elementary stream. More...

virtual int32_t	bitrate () const =0
	Returns the stream bitrate. More...

virtual void	setBitrate (int32_t bitrate)=0
	Sets the stream bitrate. More...

virtual int32_t	bitrateMode () const =0
	Returns the stream bitrate mode. More...

virtual void	setBitrateMode (int32_t bitrateMode)=0
	Sets the stream bitrate mode. More...

virtual bool_t	copyTo (StreamInfo *destination) const =0
	Copies the state of the current object to a destination object of the same type. More...

virtual void	reset ()=0
	Resets the stream information to its default state. More...

Public Member Functions inherited from Reference
virtual int32_t	retain () const =0
	Retains the instance. More...

virtual int32_t	release () const =0
	Releases the instance. More...

virtual int32_t	retainCount () const =0
	Returns the current reference count. More...

Protected Member Functions
	~AudioStreamInfo ()
	This object can be destroyed only by its implementation. More...

Protected Member Functions inherited from StreamInfo
	~StreamInfo ()
	This object can be destroyed only by its implementation. More...

Detailed Description

AudioStreamInfo describes an elementary audio stream.

Constructor & Destructor Documentation

~AudioStreamInfo ( )

protected

This object can be destroyed only by its implementation.

The caller must use Reference::release.

See Also: Object Management

Member Function Documentation

virtual int32_t bitsPerSample ( ) const

pure virtual

Returns the number of bits per sample (sample resolution).

Returns: bits per sample (usually 8, 16, 24 or 32).

Normally bits per sample is not defined for a compressed audio stream and is 0. However it is possible for a compressed audio stream to return a positive value as an indication of audio quality. It can also designate the bits per sample of the LPCM stream once the compressed stream is decoded.

virtual int32_t bytesPerFrame ( ) const

pure virtual

Returns the number of bytes occupied by an audio frame (smallest discrete unit).

Returns: bytes per frame.

A frame is the smallest unit in an audio stream. It may contain one or more samples. Depending on the audio stream type the frame may contain fixed or variable number of samples.

For compressed streams the frame size is variable even if there are fixed number of samples in each frame. In this case bytes per frame is 0.

For an LCPM stream the frame size is constant. In this case bytes per frame is a positive value. Normally for interleaved LPCM streams the following is true:

bytesPerFrame() / channels() == (sample size in bytes)
The valid bits in a sample are given by bitsPerSample() and they are aligned towards the hi-order byte.

virtual int32_t channelLayout ( ) const

pure virtual

Returns the channel layout which defines the mapping between channels and speakers.

Returns: A combination of flags defined in the AudioChannelFlags::Enum.

virtual int32_t channels ( ) const

pure virtual

Returns the number of audio channels.

Returns: Number of channels.

virtual AudioStreamInfo* clone ( ) const

pure virtual

Creates a copy of this object.

Returns: A new AudioStreamInfo. The caller is responsible for releasing the new object when it is not needed anymore.

See Also: Object Management

Implements StreamInfo.

virtual bool_t copyTo ( AudioStreamInfo * destination ) const

pure virtual

Copies the state of the current object to a destination object of the same type.

The reference count of the source and the destination is not modified.

Parameters

destination [out] A pointer to the destination object

Returns: TRUE if the object state is copied, FALSE otherwise.

virtual int32_t pcmFlags ( ) const

pure virtual

Returns the audio format flags which describe various properties of the audio stream.

Returns: A combination of flags defined in PcmFlags::Enum.

virtual int32_t sampleRate ( ) const

pure virtual

Returns the audio sample rate.

Returns: sample rate (Hz)

virtual void setBitsPerSample ( int32_t bitsPerSample )

pure virtual

Sets the number of bits per sample (sample resolution).

Parameters

bitsPerSample (usually 8, 16, 24 or 32)

virtual void setBytesPerFrame ( int32_t bytesPerFrame )

pure virtual

Sets the number of bytes occupied by an audio frame (smallest discrete unit).

Parameters

bytesPerFrame [in] Specifies how many bytes are occupied by each audio frame. Normally it is valid (greater than 0) for LPCM streams and invalid (0) for compressed audio streams.

virtual void setChannelLayout ( int32_t channelLayout )

pure virtual

Sets the channel layout which defines the mapping between channels and speakers.

Parameters

channelLayout A combination of flags defined in the AudioChannelFlags::Enum.

virtual void setChannels ( int32_t numChannels )

pure virtual

Sets the number of audio channels.

Parameters

numChannels number of channels.

virtual void setPcmFlags ( int32_t flags )

pure virtual

Sets the audio format flags which describe various properties of the audio stream.

Parameters

flags A combination of flags defined in PcmFlags::Enum.

virtual void setSampleRate ( int32_t sampleRate )

pure virtual

Sets the audio sample rate.

Parameters

sampleRate sample rate (Hz)

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation