Inheritance diagram for Sound::Ima_ADPCMStream:

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Collaboration diagram for Sound::Ima_ADPCMStream:

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Public Member Functions
	Ima_ADPCMStream (Common::SeekableReadStream *stream, bool disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)

virtual size_t	readBuffer (int16 *buffer, const size_t numSamples)
	Fill the given buffer with up to numSamples samples. More...

Public Member Functions inherited from Sound::ADPCMStream
	ADPCMStream (Common::SeekableReadStream *stream, bool disposeAfterUse, size_t size, int rate, int channels, uint32 blockAlign)

	~ADPCMStream ()

virtual bool	endOfData () const
	End of data reached? If this returns true, it means that at this time there is no data available in the stream. More...

virtual int	getChannels () const
	Return the number channels in this stream. More...

virtual int	getRate () const
	Sample rate of the stream. More...

virtual uint64	getLength () const
	Estimate the total number of samples per channel in this stream. More...

virtual bool	rewind ()
	Rewinds the stream to its start. More...

Public Member Functions inherited from Sound::RewindableAudioStream
virtual uint64	getDuration () const
	Estimate the total duration of the stream in milliseconds. More...

Public Member Functions inherited from Sound::AudioStream
virtual	~AudioStream ()

virtual bool	endOfStream () const
	End of stream reached? If this returns true, it means that all data in this stream is used up and no additional data will appear in it in the future. More...

Protected Member Functions
int16	decodeIMA (byte code, int channel=0)

Protected Member Functions inherited from Sound::ADPCMStream
virtual void	reset ()

int16	stepAdjust (byte)

Additional Inherited Members
Static Public Attributes inherited from Sound::RewindableAudioStream
static const uint64	kInvalidLength = UINT64_C(0xFFFFFFFFFFFFFFFF)

Static Public Attributes inherited from Sound::AudioStream
static const size_t	kSizeInvalid = SIZE_MAX

Protected Attributes inherited from Sound::ADPCMStream
Common::DisposablePtr< Common::SeekableReadStream >	_stream

const size_t	_size

const size_t	_startpos

const size_t	_endpos

const int	_channels

const uint32	_blockAlign

uint32	_blockPos [2]

const int	_rate

uint64	_length

struct {
struct {
int32 last

int32 stepIndex

} ima_ch [2]

}	_status

Detailed Description

Definition at line 132 of file adpcm.cpp.

Constructor & Destructor Documentation

◆ Ima_ADPCMStream()

Sound::Ima_ADPCMStream::Ima_ADPCMStream	(	Common::SeekableReadStream *	stream,
		bool	disposeAfterUse,
		uint32	size,
		int	rate,
		int	channels,
		uint32	blockAlign
	)

inline

Definition at line 137 of file adpcm.cpp.

References Sound::ADPCMStream::_channels, Sound::ADPCMStream::_length, Sound::ADPCMStream::_size, and Sound::ADPCMStream::_status.

Member Function Documentation

◆ decodeIMA()

int16 Sound::Ima_ADPCMStream::decodeIMA	(	byte	code,
		int	channel = `0`
	)

protected

Definition at line 466 of file adpcm.cpp.

References Sound::ADPCMStream::_status, ARRAYSIZE, Sound::imaStepTable, and Sound::ADPCMStream::stepAdjust().

Referenced by readBuffer(), Sound::Apple_ADPCMStream::readBuffer(), and Sound::MSIma_ADPCMStream::readBuffer().

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◆ readBuffer()

size_t Sound::Ima_ADPCMStream::readBuffer	(	int16 *	buffer,
		const size_t	numSamples
	)

virtual

Fill the given buffer with up to numSamples samples.

Returns the actual number of samples read, or kSizeInvalid if a critical error occurred (note: you must check if this value is less than what you requested, this can happen when the stream is fully used up).

Data has to be in native endianness, 16 bit per sample, signed. For stereo stream, buffer will be filled with interleaved left and right channel samples, starting with a 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.

The same holds true for more channels. Channel configurations recognized: