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Data Structures | Macros | Functions | Variables
4xm.c File Reference

4XM codec. More...

#include <inttypes.h>
#include "libavutil/avassert.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"

Go to the source code of this file.

Data Structures

struct  CFrameBuffer
 
struct  FourXContext
 

Macros

#define BLOCK_TYPE_VLC_BITS   5
 
#define ACDC_VLC_BITS   9
 
#define CFRAME_BUFFER_COUNT   100
 
#define FIX_1_082392200   70936
 
#define FIX_1_414213562   92682
 
#define FIX_1_847759065   121095
 
#define FIX_2_613125930   171254
 
#define MULTIPLY(var, const)   (((var) * (const)) >> 16)
 
#define LE_CENTRIC_MUL(dst, src, scale, dc)
 

Functions

static void idct (int16_t block[64])
 
static av_cold void init_vlcs (FourXContext *f)
 
static void init_mv (FourXContext *f, int linesize)
 
static void mcdc (uint16_t *dst, const uint16_t *src, int log2w, int h, int stride, int scale, unsigned dc)
 
static int decode_p_block (FourXContext *f, uint16_t *dst, const uint16_t *src, int log2w, int log2h, int stride)
 
static int decode_p_frame (FourXContext *f, const uint8_t *buf, int length)
 
static int decode_i_block (FourXContext *f, int16_t *block)
 decode block and dequantize.
 
static void idct_put (FourXContext *f, int x, int y)
 
static int decode_i_mb (FourXContext *f)
 
static const uint8_tread_huffman_tables (FourXContext *f, const uint8_t *const buf, int buf_size)
 
static int mix (int c0, int c1)
 
static int decode_i2_frame (FourXContext *f, const uint8_t *buf, int length)
 
static int decode_i_frame (FourXContext *f, const uint8_t *buf, int length)
 
static int decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 
static av_cold int decode_end (AVCodecContext *avctx)
 
static av_cold int decode_init (AVCodecContext *avctx)
 

Variables

static const uint8_t block_type_tab [2][4][8][2]
 
static const uint8_t size2index [4][4]
 
static const int8_t mv [256][2]
 
static const uint8_t dequant_table [64]
 
static VLC block_type_vlc [2][4]
 
AVCodec ff_fourxm_decoder
 

Detailed Description

4XM codec.

Definition in file 4xm.c.

Macro Definition Documentation

#define BLOCK_TYPE_VLC_BITS   5

Definition at line 41 of file 4xm.c.

Referenced by decode_p_block(), and init_vlcs().

#define ACDC_VLC_BITS   9

Definition at line 42 of file 4xm.c.

Referenced by decode_i_block(), decode_i_frame(), and read_huffman_tables().

#define CFRAME_BUFFER_COUNT   100

Definition at line 44 of file 4xm.c.

Referenced by decode_end(), and decode_frame().

#define FIX_1_082392200   70936

Definition at line 156 of file 4xm.c.

Referenced by idct().

#define FIX_1_414213562   92682

Definition at line 157 of file 4xm.c.

Referenced by idct().

#define FIX_1_847759065   121095

Definition at line 158 of file 4xm.c.

Referenced by idct().

#define FIX_2_613125930   171254

Definition at line 159 of file 4xm.c.

Referenced by idct().

#define MULTIPLY (   var,
  const 
)    (((var) * (const)) >> 16)

Definition at line 161 of file 4xm.c.

Referenced by idct().

#define LE_CENTRIC_MUL (   dst,
  src,
  scale,
  dc 
)
Value:
{ \
unsigned tmpval = AV_RN32(src) * (scale) + (dc); \
AV_WN32A(dst, tmpval); \
}

Definition at line 287 of file 4xm.c.

Referenced by mcdc().

Function Documentation

static void idct ( int16_t  block[64])
static

Definition at line 163 of file 4xm.c.

Referenced by avcodec_dct_init(), and idct_put().

static av_cold void init_vlcs ( FourXContext f)
static

Definition at line 248 of file 4xm.c.

Referenced by decode_init().

static void init_mv ( FourXContext f,
int  linesize 
)
static

Definition at line 265 of file 4xm.c.

Referenced by decode_p_frame().

static void mcdc ( uint16_t *  dst,
const uint16_t *  src,
int  log2w,
int  h,
int  stride,
int  scale,
unsigned  dc 
)
inlinestatic

Definition at line 294 of file 4xm.c.

Referenced by decode_p_block().

static int decode_p_block ( FourXContext f,
uint16_t *  dst,
const uint16_t *  src,
int  log2w,
int  log2h,
int  stride 
)
static

Definition at line 342 of file 4xm.c.

Referenced by decode_p_frame().

static int decode_p_frame ( FourXContext f,
const uint8_t buf,
int  length 
)
static

Definition at line 423 of file 4xm.c.

Referenced by decode_frame().

static int decode_i_block ( FourXContext f,
int16_t *  block 
)
static

decode block and dequantize.

Note this is almost identical to MJPEG.

Definition at line 491 of file 4xm.c.

Referenced by decode_i_mb().

static void idct_put ( FourXContext f,
int  x,
int  y 
)
inlinestatic

Definition at line 546 of file 4xm.c.

Referenced by decode_i_frame(), and dv_decode_video_segment().

static int decode_i_mb ( FourXContext f)
static

Definition at line 592 of file 4xm.c.

Referenced by decode_i_frame().

static const uint8_t* read_huffman_tables ( FourXContext f,
const uint8_t *const  buf,
int  buf_size 
)
static

Definition at line 606 of file 4xm.c.

Referenced by decode_i_frame().

static int mix ( int  c0,
int  c1 
)
static

Definition at line 703 of file 4xm.c.

Referenced by decode_i2_frame().

static int decode_i2_frame ( FourXContext f,
const uint8_t buf,
int  length 
)
static

Definition at line 711 of file 4xm.c.

Referenced by decode_frame().

static int decode_i_frame ( FourXContext f,
const uint8_t buf,
int  length 
)
static

Definition at line 759 of file 4xm.c.

Referenced by decode_frame().

static int decode_frame ( AVCodecContext avctx,
void data,
int *  got_frame,
AVPacket avpkt 
)
static

Definition at line 823 of file 4xm.c.

static av_cold int decode_end ( AVCodecContext avctx)
static

Definition at line 959 of file 4xm.c.

Referenced by decode_init().

static av_cold int decode_init ( AVCodecContext avctx)
static

Definition at line 977 of file 4xm.c.

Variable Documentation

const uint8_t block_type_tab[2][4][8][2]
static
Initial value:
= {
{
{
{ 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 }
}, {
{ 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 }
}, {
{ 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 }
}, {
{ 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }
}
}, {
{
{ 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
}, {
{ 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
}, {
{ 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
}, {
{ 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 }
}
}
}

Definition at line 46 of file 4xm.c.

Referenced by init_vlcs().

const uint8_t size2index[4][4]
static
Initial value:
= {
{ -1, 3, 1, 1 },
{ 3, 0, 0, 0 },
{ 2, 0, 0, 0 },
{ 2, 0, 0, 0 },
}

Definition at line 70 of file 4xm.c.

Referenced by decode_p_block().

const int8_t mv[256][2]
static
const uint8_t dequant_table[64]
static
Initial value:
= {
16, 15, 13, 19, 24, 31, 28, 17,
17, 23, 25, 31, 36, 63, 45, 21,
18, 24, 27, 37, 52, 59, 49, 20,
16, 28, 34, 40, 60, 80, 51, 20,
18, 31, 48, 66, 68, 86, 56, 21,
19, 38, 56, 59, 64, 64, 48, 20,
27, 48, 55, 55, 56, 51, 35, 15,
20, 35, 34, 32, 31, 22, 15, 8,
}

Definition at line 114 of file 4xm.c.

Referenced by decode_i_block(), and fill_tone_level_array().

VLC block_type_vlc[2][4]
static

Definition at line 125 of file 4xm.c.

AVCodec ff_fourxm_decoder
Initial value:
= {
.name = "4xm",
.long_name = NULL_IF_CONFIG_SMALL("4X Movie"),
.priv_data_size = sizeof(FourXContext),
.capabilities = CODEC_CAP_DR1,
}

Definition at line 1016 of file 4xm.c.