libavcodec/8svx.c File Reference

8svx audio decoder More...

#include "avcodec.h"
#include "internal.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 52 of file 8svx.c.

Referenced by eightsvx_decode_frame().


Typedef Documentation

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]statestarting value. it is saved for use in the next call.

Definition at line 60 of file 8svx.c.

Referenced by eightsvx_decode_frame().

static av_cold int eightsvx_decode_close ( AVCodecContext avctx) [static]

Definition at line 203 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 88 of file 8svx.c.

static av_cold int eightsvx_decode_init ( AVCodecContext avctx) [static]

initialize 8svx decoder

Definition at line 174 of file 8svx.c.

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

Definition at line 78 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 49 of file 8svx.c.

Referenced by eightsvx_decode_init().

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 225 of file 8svx.c.

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 213 of file 8svx.c.

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 237 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 47 of file 8svx.c.

Referenced by eightsvx_decode_init().