StreamPlayer Class Reference

Manages stream decoding and sends it to the computing part of the application This class is intended to be rewritten for more specific usages (spectrum analysis, feature extraction, aso.). Its the interface between libVLC (which reads the media, decodes, resamples, and does all the hard DSP) and the using of the data. More...

#include <streamplayer.h>

Inheritance diagram for StreamPlayer:

List of all members.

Public Member Functions
	StreamPlayer (bool live=false, bool verbose=true)
	Default constructor. Starts VLC instance.
	~StreamPlayer ()
	Default destructor. Frees memory and closes VLC.
string	url ()
	Returns URL of the currently playing stream.
void	setUrl (string url)
	Defines the URL of the stream to play.
void	setOverlapping (float factor)
	Turns on / off audio chunk overlapping.
void	setChunkSize (int size)
	Changes the audio chunk size.
int	chunkSize ()
	Get the current chunk size.
void	play ()
	Plays the media.
libvlc_time_t	playingTime ()
	Returns the playing time.
libvlc_time_t	totalTime ()
	Returns the total time (played + to be played)
void	stop ()
	Stops playing.
bool	isLive ()
	Are we playing a live stream ?
void	setVolume (int vol)
	Changes the volume (between 0 and 100)
int	volume ()
	Gets the current volume.
virtual void	sequenceStarts ()
	Callback called when we start playing a file.
virtual void	useBuffer ()
	Callback called when the data is ready in the buffer (miam). The user don't have to manage the memory.
virtual void	sequenceEnds ()
	Callback called when the file ended.
void	watch ()
	Watching thread.
uint16_t	buffer (int i)
	Buffer acces (for the user)
int	bufferSize ()
	Current buffer size (internal)
void	fillBuffer (uint16_t value)
	Fill buffer with a new value (internal)
void	flushBuffer ()
	Flush buffer (just keep the overlapping part)

Static Public Member Functions
static uint16_t *	convert8to16 (const uint8_t *source, int size)
	Converts an array of uint8_t to another array of uint16_t (assuming the values are coded on two bytes) The returned pointer has to be deleted by the user.
static uint16_t *	average (uint16_t *source, int size, int passes, int scale=1)
	Computes the average value of the stream, on a given frequency The returned pointer has to be deleted by the user.
static void	reduce (uint16_t *source, uint16_t *dest, int size, int passes, int scale=1)
	Reduces the stream, keeping only the extreme values.
static void	addOffset (uint16_t *source, uint16_t *dest, int size, int offset)
	Adds an offset to each value of the array.
static int	pow2 (int n)
	Get 2^n.

Public Attributes
std::deque< uint16_t >	mBuffer
	Feature extraction : those variables need to be public (I know, I can write accessors...)
QMutex	mLock
char *	mAudioData
unsigned int	mAudioDataSize
unsigned int	mFrequency

Protected Attributes
bool	mVerbose

---

Detailed Description

Manages stream decoding and sends it to the computing part of the application This class is intended to be rewritten for more specific usages (spectrum analysis, feature extraction, aso.). Its the interface between libVLC (which reads the media, decodes, resamples, and does all the hard DSP) and the using of the data.

Overlapping

When using overlapping, two audio chunks have some audio data in common : their size time the overlapping factor.

---

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

• include/core/streamplayer.h
• src/core/streamplayer.cpp