libavcodec/8svx.c File Reference

8svx audio decoder More...

#include "avcodec.h"

Go to the source code of this file.

Data Structures
struct	EightSvxContext
	decoder context More...
Defines
#define	MAX_FRAME_SIZE   32768
Typedefs
typedef struct EightSvxContext	EightSvxContext
	decoder context
Functions
static void	delta_decode (uint8_t *dst, const uint8_t *src, int src_size, uint8_t *state, const int8_t *table, int channels)
	Delta decode the compressed values in src, and put the resulting decoded samples in dst.
static void	raw_decode (uint8_t *dst, const int8_t *src, int src_size, int channels)
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)
	initialize 8svx decoder
static av_cold int	eightsvx_decode_close (AVCodecContext *avctx)
Variables
static const int8_t	fibonacci [16]
static const int8_t	exponential [16]
AVCodec	ff_eightsvx_fib_decoder
AVCodec	ff_eightsvx_exp_decoder
AVCodec	ff_pcm_s8_planar_decoder

---

Detailed Description

8svx audio decoder

Author:

Jaikrishnan Menon

supports: fibonacci delta encoding : exponential encoding

Definition in file 8svx.c.

---

Define Documentation

#define MAX_FRAME_SIZE   32768

Definition at line 51 of file 8svx.c.

Referenced by eightsvx_decode_frame().

---

Typedef Documentation

typedef struct EightSvxContext EightSvxContext

decoder context

---

Function Documentation

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

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

Parameters:

[in,out]

state

starting value. it is saved for use in the next call.

Definition at line 59 of file 8svx.c.

Referenced by eightsvx_decode_frame().

static av_cold int eightsvx_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 202 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 87 of file 8svx.c.

static av_cold int eightsvx_decode_init

(

AVCodecContext *

avctx

)

[static]

initialize 8svx decoder

Definition at line 173 of file 8svx.c.

static void raw_decode	(	uint8_t *	dst,
		const int8_t *	src,
		int	src_size,
		int	channels
	)			[static]

Definition at line 77 of file 8svx.c.

Referenced by eightsvx_decode_frame().

---

Variable Documentation

const int8_t exponential[16] [static]

Initial value:

 { -128, -64, -32, -16, -8, -4, -2, -1,
                                           0,   1,   2,   4,  8, 16, 32, 64 }

Definition at line 48 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,
  .close          = eightsvx_decode_close,
  .decode         = eightsvx_decode_frame,
  .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX exponential"),
}

Definition at line 224 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,
  .close          = eightsvx_decode_close,
  .decode         = eightsvx_decode_frame,
  .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
  .long_name      = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
}

Definition at line 212 of file 8svx.c.

AVCodec ff_pcm_s8_planar_decoder

Initial value:

 {
    .name           = "pcm_s8_planar",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_PCM_S8_PLANAR,
    .priv_data_size = sizeof(EightSvxContext),
    .init           = eightsvx_decode_init,
    .close          = eightsvx_decode_close,
    .decode         = eightsvx_decode_frame,
    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("PCM signed 8-bit planar"),
}

Definition at line 236 of file 8svx.c.

const int8_t fibonacci[16] [static]

Initial value:

 { -34, -21, -13,  -8, -5, -3, -2, -1,
                                          0,   1,   2,   3,  5,  8, 13, 21 }

Definition at line 46 of file 8svx.c.

Referenced by eightsvx_decode_init().