libavcodec/8svx.c File Reference

8svx audio decoder supports: fibonacci delta encoding : exponential encoding More...

#include "avcodec.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 *data_size, AVPacket *avpkt)
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 }
AVCodec	ff_eightsvx_fib_decoder
AVCodec	ff_eightsvx_exp_decoder
AVCodec	ff_eightsvx_raw_decoder

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Detailed Description

8svx audio decoder 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.

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Define Documentation

#define MAX_FRAME_SIZE   2048

Definition at line 54 of file 8svx.c.

Referenced by eightsvx_decode_frame().

---

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 83 of file 8svx.c.

Referenced by eightsvx_decode_frame().

static av_cold int eightsvx_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 183 of file 8svx.c.

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

Definition at line 100 of file 8svx.c.

static av_cold int eightsvx_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 161 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 63 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 52 of file 8svx.c.

Referenced by eightsvx_decode_init().

AVCodec ff_eightsvx_exp_decoder

Initial value:

 {
  .name           = "8svx_exp",
  .type           = AVMEDIA_TYPE_AUDIO,
  .id             = CODEC_ID_8SVX_EXP,
  .priv_data_size = sizeof (EightSvxContext),
  .init           = eightsvx_decode_init,
  .decode         = eightsvx_decode_frame,
  .close          = eightsvx_decode_close,
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX exponential"),
}

Definition at line 205 of file 8svx.c.

AVCodec ff_eightsvx_fib_decoder

Initial value:

 {
  .name           = "8svx_fib",
  .type           = AVMEDIA_TYPE_AUDIO,
  .id             = CODEC_ID_8SVX_FIB,
  .priv_data_size = sizeof (EightSvxContext),
  .init           = eightsvx_decode_init,
  .decode         = eightsvx_decode_frame,
  .close          = eightsvx_decode_close,
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
}

Definition at line 194 of file 8svx.c.

AVCodec ff_eightsvx_raw_decoder

Initial value:

 {
  .name           = "8svx_raw",
  .type           = AVMEDIA_TYPE_AUDIO,
  .id             = CODEC_ID_8SVX_RAW,
  .priv_data_size = sizeof(EightSvxContext),
  .init           = eightsvx_decode_init,
  .decode         = eightsvx_decode_frame,
  .close          = eightsvx_decode_close,
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX rawaudio"),
}

Definition at line 216 of file 8svx.c.

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 51 of file 8svx.c.

Referenced by eightsvx_decode_init().