FFmpeg: libavcodec/mss12.h File Reference

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Data Structures | Macros | Functions

mss12.h File Reference

Common header for Microsoft Screen 1 and 2. More...

#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"

Go to the source code of this file.

Data Structures

struct Model

struct ArithCoder

struct PixContext

struct SliceContext

struct MSS12Context

Macros

#define MODEL_MIN_SYMS 2

#define MODEL_MAX_SYMS 256

#define THRESH_ADAPTIVE -1

#define THRESH_LOW 15

#define THRESH_HIGH 50

#define ARITH_GET_BIT(VERSION)

#define ARITH_GET_MODEL_SYM(VERSION)

Functions

int ff_mss12_decode_rect (SliceContext *ctx, ArithCoder *acoder, int x, int y, int width, int height)

void ff_mss12_model_update (Model *m, int val)

void ff_mss12_slicecontext_reset (SliceContext *sc)

int ff_mss12_decode_init (MSS12Context *c, int version, SliceContext *sc1, SliceContext *sc2)

int ff_mss12_decode_end (MSS12Context *ctx)

Detailed Description

Common header for Microsoft Screen 1 and 2.

Definition in file mss12.h.

Macro Definition Documentation

#define MODEL_MIN_SYMS 2

Definition at line 34 of file mss12.h.

#define MODEL_MAX_SYMS 256

Definition at line 35 of file mss12.h.

#define THRESH_ADAPTIVE -1

Definition at line 36 of file mss12.h.

Referenced by model_rescale_weights(), pixctx_init(), and slicecontext_init().

#define THRESH_LOW 15

Definition at line 37 of file mss12.h.

Referenced by pixctx_init(), and slicecontext_init().

#define THRESH_HIGH 50

Definition at line 38 of file mss12.h.

Referenced by pixctx_init(), and slicecontext_init().

#define ARITH_GET_BIT ( VERSION )

Value:

static int arith ## VERSION ## _get_bit(ArithCoder *c) \

{ \

int range = c->high - c->low + 1; \

int bit = 2 * c->value - c->low >= c->high; \

if (bit) \

c->low += range >> 1; \

else \

c->high = c->low + (range >> 1) - 1; \

arith ## VERSION ## _normalise(c); \

return bit; \

}

Definition at line 102 of file mss12.h.

#define ARITH_GET_MODEL_SYM ( VERSION )

Value:

static int arith ## VERSION ## _get_model_sym(ArithCoder *c, Model *m) \

{ \

int idx, val; \

idx = arith ## VERSION ## _get_prob(c, m->cum_prob); \

val = m->idx2sym[idx]; \

ff_mss12_model_update(m, idx); \

arith ## VERSION ## _normalise(c); \

return val; \

}

Definition at line 118 of file mss12.h.

Function Documentation

int ff_mss12_decode_rect ( SliceContext * ctx,

ArithCoder * acoder,

int x,

int y,

int width,

int height

)

Definition at line 526 of file mss12.c.

Referenced by ff_mss12_decode_rect(), mss1_decode_frame(), and mss2_decode_frame().

void ff_mss12_model_update ( Model * m,

int val

)

Definition at line 93 of file mss12.c.

void ff_mss12_slicecontext_reset ( SliceContext * sc )

Definition at line 426 of file mss12.c.

Referenced by mss1_decode_frame(), and mss2_decode_frame().

int ff_mss12_decode_init ( MSS12Context * c,

int version,

SliceContext * sc1,

SliceContext * sc2

)

Definition at line 562 of file mss12.c.

Referenced by mss1_decode_init(), and mss2_decode_init().

int ff_mss12_decode_end ( MSS12Context * ctx )

Definition at line 674 of file mss12.c.

Referenced by mss1_decode_end(), and mss2_decode_end().

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