Audio::Mp3PspStream Class Reference

Inheritance diagram for Audio::Mp3PspStream:

Public Member Functions
	Mp3PspStream (Common::SeekableReadStream *inStream, DisposeAfterUse::Flag dispose)
int	readBuffer (int16 *buffer, const int numSamples)
bool	endOfData () const
bool	isStereo () const
int	getRate () const
bool	seek (const Timestamp &where)
Timestamp	getLength () const
Public Member Functions inherited from Audio::SeekableAudioStream
bool	seek (uint32 where)
virtual bool	rewind ()
Public Member Functions inherited from Audio::AudioStream
virtual bool	endOfStream () const

Static Public Member Functions
static bool	isOkToCreateStream ()
Static Public Member Functions inherited from Audio::SeekableAudioStream
static SeekableAudioStream *	openStreamFile (const Common::Path &basename)

Protected Types
enum	State { MP3_STATE_INIT, MP3_STATE_READY, MP3_STATE_EOS }
enum	{ BUFFER_SIZE = 5 * 8192 }

Protected Member Functions
int16 _pcmSamples [1152 *2]	__attribute__ ((aligned(64)))
byte _codecInBuffer [3072]	__attribute__ ((aligned(64)))
unsigned long _codecParams [65]	__attribute__ ((aligned(64)))
void	decodeMP3Data ()
void	readMP3DataIntoBuffer ()
int	initStream ()
void	findValidHeader ()
void	deinitStream ()
void	updatePcmLength ()
bool	initStreamME ()
void	releaseStreamME ()

Static Protected Member Functions
static bool	loadStartAudioModule (const char *modname, int partition)
static bool	initDecoder ()
static bool	stopDecoder ()

Protected Attributes
Common::DisposablePtr< Common::SeekableReadStream >	_inStream
uint32	_pcmLength
uint	_posInFrame
State	_state
Timestamp	_length
uint32	_sampleRate
bool	_stereo
mad_timer_t	_totalTime
mad_stream	_stream
mad_header	_header
byte	_buf [BUFFER_SIZE+MAD_BUFFER_GUARD]

Static Protected Attributes
static bool	_decoderInit
static bool	_decoderFail

Member Function Documentation

readBuffer()

int Audio::Mp3PspStream::readBuffer ( int16 *  buffer, const int  numSamples  )

virtual

Fill the given buffer with up to numSamples samples.

Data must be in native endianness, 16 bits per sample, signed. For stereo stream, the buffer will be filled with interleaved left and right channel samples, starting with the left sample. Furthermore, the samples in the left and right are summed up. So if you request 4 samples from a stereo stream, you will get a total of two left channel and two right channel samples.

Returns

The actual number of samples read, or -1 if a critical error occurred.

Note

You must check whether the returned value is less than what you requested. This indicates that the stream is fully used up.

Implements Audio::AudioStream.

endOfData()

bool Audio::Mp3PspStream::endOfData ( ) const

inlinevirtual

Check whether end of data has been reached.

If this returns true, it indicates that at this time there is no data available in the stream. However, there might be more data in the future.

This is used by e.g. a rate converter to decide whether to keep on converting data or to stop.

Implements Audio::AudioStream.

isStereo()

bool Audio::Mp3PspStream::isStereo ( ) const

inlinevirtual

Check whether this is a stereo stream.

Implements Audio::AudioStream.

getRate()

int Audio::Mp3PspStream::getRate ( ) const

inlinevirtual

Sample rate of the stream.

Implements Audio::AudioStream.

seek()

bool Audio::Mp3PspStream::seek ( const Timestamp &  where )

virtual

Seek to a given offset in the stream.

Parameters

where

Offset as a timestamp.

Returns

True on success, false on failure.

Implements Audio::SeekableAudioStream.

getLength()

Timestamp Audio::Mp3PspStream::getLength ( ) const

inlinevirtual

Return the length of the stream.

Returns

Length as a timestamp.

Implements Audio::SeekableAudioStream.

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

• backends/platform/psp/mp3.h