libavcodec/8svx.c File Reference

8svx audio decoder More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "libavutil/common.h"

Go to the source code of this file.

Data Structures
struct	EightSvxContext
	decoder context More...
Defines
#define	MAX_FRAME_SIZE   2048
Functions
static void	interleave_stereo (uint8_t *dst, const uint8_t *src, int size)
	Interleave samples in buffer containing all left channel samples at the beginning, and right channel samples at the end.
static int	delta_decode (int8_t *dst, const uint8_t *src, int src_size, int8_t val, const int8_t *table)
	Delta decode the compressed values in src, and put the resulting decoded n samples in dst.
static int	eightsvx_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
	decode a frame
static av_cold int	eightsvx_decode_init (AVCodecContext *avctx)
static av_cold int	eightsvx_decode_close (AVCodecContext *avctx)
Variables
static const int8_t	fibonacci [16] = { -34, -21, -13, -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8, 13, 21 }
static const int8_t	exponential [16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 }

---

Detailed Description

8svx audio decoder

Author:

Jaikrishnan Menon

supports: fibonacci delta encoding : exponential encoding

For more information about the 8SVX format: http://netghost.narod.ru/gff/vendspec/iff/iff.txt http://sox.sourceforge.net/AudioFormats-11.html http://aminet.net/package/mus/misc/wavepak http://amigan.1emu.net/reg/8SVX.txt

Samples can be found here: http://aminet.net/mods/smpl/

Definition in file 8svx.c.

---

Define Documentation

#define MAX_FRAME_SIZE   2048

Definition at line 59 of file 8svx.c.

Referenced by eightsvx_decode_frame(), g722_encode_init(), libopus_dec_decode(), and read_packet().

---

Function Documentation

static int delta_decode	(	int8_t *	dst,
		const uint8_t *	src,
		int	src_size,
		int8_t	val,
		const int8_t *	table
	)			[static]

Delta decode the compressed values in src, and put the resulting decoded n samples in dst.

Parameters:

	val	starting value assumed by the delta sequence
	table	delta sequence table

Returns:

size in bytes of the decoded data, must be src_size*2

Definition at line 88 of file 8svx.c.

Referenced by eightsvx_decode_frame().

static av_cold int eightsvx_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 211 of file 8svx.c.

static int eightsvx_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_frame_ptr,
		AVPacket *	avpkt
	)			[static]

decode a frame

Definition at line 106 of file 8svx.c.

static av_cold int eightsvx_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 185 of file 8svx.c.

static void interleave_stereo	(	uint8_t *	dst,
		const uint8_t *	src,
		int	size
	)			[static]

Interleave samples in buffer containing all left channel samples at the beginning, and right channel samples at the end.

Each sample is assumed to be in signed 8-bit format.

Parameters:

size

the size in bytes of the dst and src buffer

Definition at line 68 of file 8svx.c.

Referenced by eightsvx_decode_frame().

---

Variable Documentation

const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 } [static]

Definition at line 57 of file 8svx.c.

Referenced by eightsvx_decode_init().

const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8, 13, 21 } [static]

Definition at line 56 of file 8svx.c.

Referenced by eightsvx_decode_init().