Audio

Audio related definitions and functions. More...

Modules
	Audio decoding
	Audio related definitions and functions (reading).
	Audio encoding
	Audio related definitions and functions (writing).
	Multichannel support
Enumerations
enum	lqt_sample_format_t {   LQT_SAMPLE_UNDEFINED = 0,   LQT_SAMPLE_INT8,   LQT_SAMPLE_UINT8,   LQT_SAMPLE_INT16,   LQT_SAMPLE_INT32,   LQT_SAMPLE_FLOAT,   LQT_SAMPLE_DOUBLE }
	Sample format definitions for audio. More...
Functions
void	lqt_set_audio_parameter (quicktime_t *file, int track, const char *key, const void *value)
	Set a codec parameter for an audio track.
const char *	lqt_sample_format_to_string (lqt_sample_format_t sampleformat)
	Get a human readable description for a sample format.
lqt_sample_format_t	lqt_get_sample_format (quicktime_t *file, int track)
	Return the sample format used natively by the codec.

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Detailed Description

Audio related definitions and functions.

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Enumeration Type Documentation

enum lqt_sample_format_t

Sample format definitions for audio.

This defines the datatype for audio samples, which will be used by a particular codec. You'll need this, if you want to use lqt_decode_audio_raw or lqt_encode_audio_raw . Byte order of the data is always machine native. Endianess conversion is responsibility of the codec.

Enumerator:

LQT_SAMPLE_UNDEFINED	If this is returned, we have an error
LQT_SAMPLE_INT8	int8_t
LQT_SAMPLE_UINT8	uint8_t
LQT_SAMPLE_INT16	int16_t
LQT_SAMPLE_INT32	int32_t
LQT_SAMPLE_FLOAT	Float (machine native)
LQT_SAMPLE_DOUBLE	Double (machine native, since version 1.0.3)

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Function Documentation

void lqt_set_audio_parameter	(	quicktime_t *	file,
		int	track,
		const char *	key,
		const void *	value
	)

Set a codec parameter for an audio track.

Parameters:

	file	A quicktime handle
	track	Track index (starting with 0)
	key	Short name of the parameter
	value	Parameter value.

For integer parameters, value must be of the type int*. For string parameters, use char*. For floating-point parameters, use float*.

const char* lqt_sample_format_to_string

(

lqt_sample_format_t

sampleformat

)

Get a human readable description for a sample format.

Parameters:

sampleformat

A sampleformat

Returns:

The description or NULL

lqt_sample_format_t lqt_get_sample_format	(	quicktime_t *	file,
		int	track
	)

Return the sample format used natively by the codec.

Parameters:

	file	A quicktime handle
	track	Track index (starting with 0)

Returns:

The sampleformat

Use this function if you want to use lqt_decode_audio_raw or lqt_encode_audio_raw to bypass libquicktimes internal sample format conversion routines.

*Note* Some codecs call