audioconverter.cc File Reference

#include "tdsystem.h"
#include "tools.h"
#include "audioconverter.h"

Functions
cardinal	getAlignedLength (const AudioQualityInterface &inputQuality, const AudioQualityInterface &outputQuality, const cardinal inputLength)
bool	getConvParams (const cardinal in, const cardinal out, cardinal &a, cardinal &b, float &c)
void	get12 (const card8 *buffer, card16 &a, card16 &b)
void	set12 (card8 *buffer, const card16 c, const card16 d)
cardinal	AudioConverter (const AudioQualityInterface &from, const AudioQualityInterface &to, const card8 *inputBuffer, card8 *outputBuffer, const cardinal inputLength, const cardinal outputLength)

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Function Documentation

cardinal AudioConverter	(	const AudioQualityInterface &	from,
		const AudioQualityInterface &	to,
		const card8 *	inputBuffer,
		card8 *	outputBuffer,
		const cardinal	inputLength,
		const cardinal	outputLength
	)

Audio quality converter. Convert quality from a given value to a given value. Note: The "from" value must be greater than or equal to the "to" value, that is from-sampling rate >= to-sampling rate, from-bits >= to-bits, from-channels >= to-channels.

Parameters:

from	Quality to convert from.
to	Quality to convert to.
inputBuffer	Input buffer.
outputBuffer	Output buffer.
inputLength	Length of the audio data in input buffer.
outputLength	Length of the output buffer.

Returns:

Length after conversion.

void get12	(	const card8 *	buffer,
		card16 &	a,
		card16 &	b
	)		[inline]

cardinal getAlignedLength	(	const AudioQualityInterface &	inputQuality,
		const AudioQualityInterface &	outputQuality,
		const cardinal	inputLength
	)

Get aligned output length for a conversion from given input quality and input length to output quality. Example: 12 Bit/Stereo has a 6-byte alignment: L1L1R1R2 = 48 bits = 6 Bytes.

Parameters:

inputQuality	Input quality.
outputQuality	Output quality.
inputLength	Input length.

Returns:

Aligned length.

bool getConvParams	(	const cardinal	in,
		const cardinal	out,
		cardinal &	a,
		cardinal &	b,
		float &	c
	)

Get parameters for audio conversion. New sampling rate = (a * OldSamplingRate) / b;

Parameters:

in	Old sampling rate.
out	New sampling rate.
a	Reference to store a.
b	Reference to store b.
c	Reference to store float in / out.

Returns:

true, if a and b have been found; false, if there are no such numbers for b out of the set {1,2,...,20}

void set12	(	card8 *	buffer,
		const card16	c,
		const card16	d
	)		[inline]