libavcodec/adx.h File Reference

SEGA CRI adx codecs. More...

#include <stdint.h>
#include "avcodec.h"

Go to the source code of this file.

Data Structures
struct	ADXChannelState
struct	ADXContext
Defines
#define	COEFF_BITS   12
#define	BLOCK_SIZE   18
#define	BLOCK_SAMPLES   32
Functions
void	ff_adx_calculate_coeffs (int cutoff, int sample_rate, int bits, int *coeff)
	Calculate LPC coefficients based on cutoff frequency and sample rate.
int	avpriv_adx_decode_header (AVCodecContext *avctx, const uint8_t *buf, int bufsize, int *header_size, int *coeff)
	Decode ADX stream header.

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Detailed Description

SEGA CRI adx codecs.

Reference documents: http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/

Definition in file adx.h.

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Define Documentation

#define BLOCK_SAMPLES   32

Definition at line 55 of file adx.h.

Referenced by adx_decode(), adx_decode_frame(), adx_read_header(), and avpriv_adx_decode_header().

#define BLOCK_SIZE   18

Definition at line 54 of file adx.h.

Referenced by adx_decode(), adx_decode_frame(), adx_parse(), adx_read_packet(), au_read_packet(), avpriv_adx_decode_header(), blockCopy_TMPL(), doHorizDefFilter_C(), doHorizLowPass_C(), doVertDefFilter_TMPL(), doVertLowPass_TMPL(), horizX1Filter(), isHorizDC_C(), isVertDC_C(), isVertMinMaxOk_C(), postProcess_TMPL(), rso_read_packet(), and vertX1Filter_TMPL().

#define COEFF_BITS   12

Definition at line 52 of file adx.h.

Referenced by adx_decode(), adx_encode(), adx_encode_init(), avpriv_adx_decode_header(), config(), and resampleCubic().

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Function Documentation

int avpriv_adx_decode_header	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	bufsize,
		int *	header_size,
		int *	coeff
	)

Decode ADX stream header.

Sets avctx->channels and avctx->sample_rate.

Parameters:

	avctx	codec context
	buf	header data
	bufsize	data size, should be at least 24 bytes
[out]	header_size	size of ADX header
[out]	coeff	2 LPC coefficients, can be NULL

Returns:

data offset or negative error code if header is invalid

Definition at line 37 of file adx.c.

Referenced by adx_decode_frame(), adx_decode_init(), and adx_read_header().

void ff_adx_calculate_coeffs	(	int	cutoff,
		int	sample_rate,
		int	bits,
		int *	coeff
	)

Calculate LPC coefficients based on cutoff frequency and sample rate.

Parameters:

	cutoff	cutoff frequency
	sample_rate	sample rate
	bits	number of bits used to quantize coefficients
[out]	coeff	2 quantized LPC coefficients

Definition at line 25 of file adx.c.

Referenced by adx_encode_init(), and avpriv_adx_decode_header().