AudioBase base class for many other audio classes which stream data. More...

#include <audio2.h>

Inheritance diagram for ost::AudioBase:

Public Member Functions
	AudioBase ()
	Create audio base object with no info. More...

	AudioBase (Info *info)
	Create audio base object with audio source description. More...

virtual	~AudioBase ()
	Destroy an audio base object. More...

Encoding	getEncoding (void)
	Generic get encoding. More...

unsigned	getSampleRate (void)
	Generic sample rate. More...

virtual ssize_t	putBuffer (Encoded data, size_t size)=0
	Abstract interface to put raw data. More...

ssize_t	putNative (Encoded data, size_t size)
	Puts raw data and does native to refined endian swapping if needed based on encoding type and local machine endian. More...

virtual ssize_t	getBuffer (Encoded data, size_t size)=0
	Abstract interface to get raw data. More...

ssize_t	getPacket (Encoded data)
	Get's a packet of audio data. More...

ssize_t	getNative (Encoded data, size_t size)
	Get raw data and assure is in native machine endian. More...

Protected Attributes
Info	info

Additional Inherited Members
Public Types inherited from ost::Audio
enum	Rate { rateUnknown, rate6khz = 6000, rate8khz = 8000, rate16khz = 16000, rate32khz = 32000, rate44khz = 44100 }
	Audio encoding rate, samples per second. More...

enum	Mode { modeRead, modeReadAny, modeReadOne, modeWrite, modeCache, modeInfo, modeFeed, modeAppend, modeCreate }
	File processing mode, whether to skip missing files, etc. More...

enum	Encoding { unknownEncoding = 0, g721ADPCM, g722Audio, g722_7bit, g722_6bit, g723_2bit, g723_3bit, g723_5bit, gsmVoice, msgsmVoice, mulawAudio, alawAudio, mp1Audio, mp2Audio, mp3Audio, okiADPCM, voxADPCM, sx73Voice, sx96Voice, cdaStereo, cdaMono, pcm8Stereo, pcm8Mono, pcm16Stereo, pcm16Mono, pcm32Stereo, pcm32Mono, speexVoice, speexAudio, g729Audio, ilbcAudio, speexUltra, speexNarrow = speexVoice, speexWide = speexAudio, g723_4bit = g721ADPCM }
	Audio encoding formats. More...

enum	Format { raw, snd, riff, mpeg, wave }
	Audio container file format. More...

enum	DeviceMode { PLAY, RECORD, PLAYREC }
	Audio device access mode. More...

enum	Error { errSuccess = 0, errReadLast, errNotOpened, errEndOfFile, errStartOfFile, errRateInvalid, errEncodingInvalid, errReadInterrupt, errWriteInterrupt, errReadFailure, errWriteFailure, errReadIncomplete, errWriteIncomplete, errRequestInvalid, errTOCFailed, errStatFailed, errInvalidTrack, errPlaybackFailed, errNotPlaying, errNoCodec }
	Audio error conditions. More...

typedef int16_t	snd16_t

typedef int32_t	snd32_t

typedef int16_t	Level

typedef int16_t	Sample

typedef int16_t *	Linear

typedef unsigned long	timeout_t

typedef unsigned char *	Encoded

typedef enum Rate	Rate

typedef enum Mode	Mode

typedef enum Encoding	Encoding

typedef enum Format	Format

typedef enum DeviceMode	DeviceMode

typedef enum Error	Error

Static Public Member Functions inherited from ost::Audio
static Level	tolevel (float dbm)
	Convert dbm power level to integer value (0-32768). More...

static float	todbm (Level power)
	Convert integer power levels to dbm. More...

static bool	hasDevice (unsigned device=0)
	Test for the presense of a specified (indexed) audio device. More...

static AudioDevice *	getDevice (unsigned device=0, DeviceMode mode=PLAY)
	Get a audio device object that can be used to play or record audio. More...

static const char *	getCodecPath (void)
	Get pathname to where loadable codec modules are stored. More...

static const char *	getMIME (Info &info)
	Get the mime descriptive type for a given Audio encoding description, usually retrieved from a newly opened audio file. More...

static const char *	getName (Encoding encoding)
	Get the short ascii description used for the given audio encoding type. More...

static const char *	getExtension (Encoding encoding)
	Get the preferred file extension name to use for a given audio encoding type. More...

static Encoding	getEncoding (const char *name)
	Get the audio encoding format that is specified by a short ascii name. More...

static Encoding	getStereo (Encoding encoding)
	Get the stereo encoding format associated with the given format. More...

static Encoding	getMono (Encoding encoding)
	Get the mono encoding format associated with the given format. More...

static bool	isLinear (Encoding encoding)
	Test if the audio encoding format is a linear one. More...

static bool	isBuffered (Encoding encoding)
	Test if the audio encoding format must be packetized (that is, has irregular sized frames) and must be processed only through buffered codecs. More...

static bool	isMono (Encoding encoding)
	Test if the audio encoding format is a mono format. More...

static bool	isStereo (Encoding encoding)
	Test if the audio encoding format is a stereo format. More...

static Rate	getRate (Encoding encoding)
	Return default sample rate associated with the specified audio encoding format. More...

static Rate	getRate (Encoding e, Rate request)
	Return optional rate setting effect. More...

static timeout_t	getFraming (Encoding encoding, timeout_t timeout=0)
	Return frame timing for an audio encoding format. More...

static timeout_t	getFraming (Info &info, timeout_t timeout=0)
	Return frame time for an audio source description. More...

static bool	isEndian (Encoding encoding)
	Test if the endian byte order of the encoding format is different from the machine's native byte order. More...

static bool	isEndian (Info &info)
	Test if the endian byte order of the audio source description is different from the machine's native byte order. More...

static bool	swapEndian (Encoding encoding, void *buffer, unsigned number)
	Optionally swap endian of audio data if the encoding format endian byte order is different from the machine's native endian. More...

static void	swapEncoded (Info &info, Encoded data, size_t bytes)
	Optionally swap endian of encoded audio data based on the audio encoding type, and relationship to native byte order. More...

static bool	swapEndian (Info &info, void *buffer, unsigned number)
	Optionally swap endian of audio data if the audio source description byte order is different from the machine's native endian byte order. More...

static Level	getImpulse (Encoding encoding, void *buffer, unsigned number)
	Get the energey impulse level of a frame of audio data. More...

static Level	getImpulse (Info &info, void *buffer, unsigned number=0)
	Get the energey impulse level of a frame of audio data. More...

static Level	getPeak (Encoding encoding, void *buffer, unsigned number)
	Get the peak (highest energy) level found in a frame of audio data. More...

static Level	getPeak (Info &info, void *buffer, unsigned number=0)
	Get the peak (highest energy) level found in a frame of audio data. More...

static void	toTimestamp (timeout_t duration, char *address, size_t size)
	Provide ascii timestamp representation of a timeout value. More...

static timeout_t	toTimeout (const char *timestamp)
	Convert ascii timestamp representation to a timeout number. More...

static int	getFrame (Encoding encoding, int samples=0)
	Returns the number of bytes in a sample frame for the given encoding type, rounded up to the nearest integer. More...

static int	getCount (Encoding encoding)
	Returns the number of samples in all channels for a frame in the given encoding. More...

static unsigned long	toSamples (Encoding encoding, size_t bytes)
	Compute byte counts of audio data into number of samples based on the audio encoding format used. More...

static unsigned long	toSamples (Info &info, size_t bytes)
	Compute byte counts of audio data into number of samples based on the audio source description used. More...

static size_t	toBytes (Info &info, unsigned long number)
	Compute the number of bytes a given number of samples in a given audio encoding will occupy. More...

static size_t	toBytes (Encoding encoding, unsigned long number)
	Compute the number of bytes a given number of samples in a given audio encoding will occupy. More...

static void	fill (unsigned char *address, int number, Encoding encoding)
	Fill an audio buffer with "empty" (silent) audio data, based on the audio encoding format. More...

static bool	loadPlugin (const char *path)
	Load a dso plugin (codec plugin), used internally... More...

static size_t	maxFramesize (Info &info)
	Maximum framesize for a given coding that may be needed to store a result. More...

Static Public Attributes inherited from ost::Audio
static const unsigned	ndata

Detailed Description

AudioBase base class for many other audio classes which stream data.

common audio stream base.

Constructor & Destructor Documentation

ost::AudioBase::AudioBase ( )

Create audio base object with no info.

ost::AudioBase::AudioBase ( Info * info )

Create audio base object with audio source description.

Parameters

info	source description.

virtual ost::AudioBase::~AudioBase ( )

virtual

Destroy an audio base object.

Member Function Documentation

virtual ssize_t ost::AudioBase::getBuffer	(	Encoded	data,
		size_t	size
	)

pure virtual

Abstract interface to get raw data.

Returns: data received in buffer.

Parameters

data	to get.
size	of data to get.

Implemented in ost::AudioDevice, ost::AudioStream, ost::AudioFile, and ost::AudioBuffer.

Encoding ost::AudioBase::getEncoding ( void )

inline

Generic get encoding.

Returns: audio encoding of this object.

ssize_t ost::AudioBase::getNative	(	Encoded	data,
		size_t	size
	)

Get raw data and assure is in native machine endian.

Returns: data received in buffer.

Parameters

data	to get.
size	of data to get.

ssize_t ost::AudioBase::getPacket ( Encoded data )

inline

Get's a packet of audio data.

Returns: count of data received.

Parameters

data to get.

unsigned ost::AudioBase::getSampleRate ( void )

inline

Generic sample rate.

Returns: audio sample rate of this object.

virtual ssize_t ost::AudioBase::putBuffer	(	Encoded	data,
		size_t	size
	)

pure virtual

Abstract interface to put raw data.

Parameters

data	to put.
size	of data to put.

Returns: number of bytes actually put.

Implemented in ost::AudioDevice, ost::AudioFile, and ost::AudioBuffer.

ssize_t ost::AudioBase::putNative	(	Encoded	data,
		size_t	size
	)

Puts raw data and does native to refined endian swapping if needed based on encoding type and local machine endian.

Parameters

data	to put.
size	of data to put.

Returns: number of bytes actually put.

Member Data Documentation

Info ost::AudioBase::info

protected

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

audio2.h

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation