mss3.c File Reference

Microsoft Screen 3 (aka Microsoft ATC Screen) decoder. More...

#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#include "mss34dsp.h"

Go to the source code of this file.

Data Structures
struct	Model2
struct	Model
struct	Model256
struct	RangeCoder
struct	BlockTypeContext
struct	FillBlockCoder
struct	ImageBlockCoder
struct	DCTBlockCoder
struct	HaarBlockCoder
struct	MSS3Context

Macros
#define	HEADER_SIZE   27
#define	MODEL2_SCALE   13
#define	MODEL_SCALE   15
#define	MODEL256_SEC_SCALE   9
#define	RAC_BOTTOM   0x01000000

Enumerations
enum	BlockType {   FILL_BLOCK = 0, IMAGE_BLOCK, DCT_BLOCK, HAAR_BLOCK,   SKIP_BLOCK, SKIP_BLOCK = 0, DCT_BLOCK, IMAGE_BLOCK }

Functions
static void	model2_reset (Model2 *m)
static void	model2_update (Model2 *m, int bit)
static void	model_update (Model *m, int val)
static void	model_reset (Model *m)
static av_cold void	model_init (Model *m, int num_syms)
static void	model256_update (Model256 *m, int val)
static void	model256_reset (Model256 *m)
static av_cold void	model256_init (Model256 *m)
static void	rac_init (RangeCoder *c, const uint8_t *src, int size)
static void	rac_normalise (RangeCoder *c)
static int	rac_get_bit (RangeCoder *c)
static int	rac_get_bits (RangeCoder *c, int nbits)
static int	rac_get_model2_sym (RangeCoder *c, Model2 *m)
static int	rac_get_model_sym (RangeCoder *c, Model *m)
static int	rac_get_model256_sym (RangeCoder *c, Model256 *m)
static int	decode_block_type (RangeCoder *c, BlockTypeContext *bt)
static int	decode_coeff (RangeCoder *c, Model *m)
static void	decode_fill_block (RangeCoder *c, FillBlockCoder *fc, uint8_t *dst, int stride, int block_size)
static void	decode_image_block (RangeCoder *c, ImageBlockCoder *ic, uint8_t *dst, int stride, int block_size)
static int	decode_dct (RangeCoder *c, DCTBlockCoder *bc, int *block, int bx, int by)
static void	decode_dct_block (RangeCoder *c, DCTBlockCoder *bc, uint8_t *dst, int stride, int block_size, int *block, int mb_x, int mb_y)
static void	decode_haar_block (RangeCoder *c, HaarBlockCoder *hc, uint8_t *dst, int stride, int block_size, int *block)
static void	reset_coders (MSS3Context *ctx, int quality)
static av_cold void	init_coders (MSS3Context *ctx)
static int	mss3_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int	mss3_decode_init (AVCodecContext *avctx)
static av_cold int	mss3_decode_end (AVCodecContext *avctx)

Variables
AVCodec	ff_msa1_decoder

Detailed Description

Microsoft Screen 3 (aka Microsoft ATC Screen) decoder.

Definition in file mss3.c.

Macro Definition Documentation

#define HEADER_SIZE   27

Definition at line 32 of file mss3.c.

Referenced by mss3_decode_frame().

#define MODEL2_SCALE   13

Definition at line 34 of file mss3.c.

Referenced by rac_get_model2_sym().

#define MODEL_SCALE   15

Definition at line 35 of file mss3.c.

Referenced by rac_get_model256_sym(), and rac_get_model_sym().

#define MODEL256_SEC_SCALE   9

Definition at line 36 of file mss3.c.

Referenced by model256_update(), and rac_get_model256_sym().

#define RAC_BOTTOM   0x01000000

Definition at line 59 of file mss3.c.

Referenced by rac_get_bit(), rac_get_bits(), rac_get_model256_sym(), rac_get_model2_sym(), rac_get_model_sym(), and rac_normalise().

Enumeration Type Documentation

enum BlockType

Enumerator:

FILL_BLOCK
IMAGE_BLOCK
DCT_BLOCK
HAAR_BLOCK
SKIP_BLOCK
SKIP_BLOCK
DCT_BLOCK
IMAGE_BLOCK

Definition at line 67 of file mss3.c.

Function Documentation

static void model2_reset ( Model2 *  m )

static

Definition at line 125 of file mss3.c.

Referenced by reset_coders().

static void model2_update ( Model2 *  m, int  bit  )

static

Definition at line 135 of file mss3.c.

Referenced by rac_get_model2_sym().

static void model_update ( Model *  m, int  val  )

static

Definition at line 161 of file mss3.c.

Referenced by model_reset(), and rac_get_model_sym().

static void model_reset ( Model *  m )

static

Definition at line 191 of file mss3.c.

Referenced by model_init(), and reset_coders().

static av_cold void model_init ( Model *  m, int  num_syms  )

static

Definition at line 207 of file mss3.c.

Referenced by init_coders().

static void model256_update ( Model256 *  m, int  val  )

static

Definition at line 215 of file mss3.c.

Referenced by model256_reset(), and rac_get_model256_sym().

static void model256_reset ( Model256 *  m )

static

Definition at line 252 of file mss3.c.

Referenced by model256_init(), and reset_coders().

static av_cold void model256_init ( Model256 *  m )

static

Definition at line 268 of file mss3.c.

Referenced by init_coders().

static void rac_init ( RangeCoder *  c, const uint8_t *  src, int  size  )

static

Definition at line 276 of file mss3.c.

Referenced by mss3_decode_frame().

static void rac_normalise ( RangeCoder *  c )

static

Definition at line 289 of file mss3.c.

Referenced by rac_get_bit(), rac_get_bits(), rac_get_model256_sym(), rac_get_model2_sym(), and rac_get_model_sym().

static int rac_get_bit ( RangeCoder *  c )

static

Definition at line 305 of file mss3.c.

Referenced by decode_coeff().

static int rac_get_bits ( RangeCoder *  c, int  nbits  )

static

Definition at line 321 of file mss3.c.

Referenced by decode_coeff(), and decode_dct().

static int rac_get_model2_sym ( RangeCoder *  c, Model2 *  m  )

static

Definition at line 335 of file mss3.c.

Referenced by decode_dct().

static int rac_get_model_sym ( RangeCoder *  c, Model *  m  )

static

Definition at line 356 of file mss3.c.

Referenced by decode_block_type(), decode_coeff(), and decode_image_block().

static int rac_get_model256_sym ( RangeCoder *  c, Model256 *  m  )

static

Definition at line 388 of file mss3.c.

Referenced by decode_dct(), decode_haar_block(), and decode_image_block().

static int decode_block_type ( RangeCoder *  c, BlockTypeContext *  bt  )

static

Definition at line 426 of file mss3.c.

Referenced by mss3_decode_frame().

static int decode_coeff ( RangeCoder *  c, Model *  m  )

static

Definition at line 433 of file mss3.c.

Referenced by decode_dct(), decode_fill_block(), and decode_haar_block().

static void decode_fill_block ( RangeCoder *  c, FillBlockCoder *  fc, uint8_t *  dst, int  stride, int  block_size  )

static

Definition at line 451 of file mss3.c.

Referenced by mss3_decode_frame().

static void decode_image_block ( RangeCoder *  c, ImageBlockCoder *  ic, uint8_t *  dst, int  stride, int  block_size  )

static

Definition at line 462 of file mss3.c.

Referenced by mss3_decode_frame().

static int decode_dct ( RangeCoder *  c, DCTBlockCoder *  bc, int *  block, int  bx, int  by  )

static

Definition at line 496 of file mss3.c.

Referenced by decode_dct_block().

static void decode_dct_block ( RangeCoder *  c, DCTBlockCoder *  bc, uint8_t *  dst, int  stride, int  block_size, int *  block, int  mb_x, int  mb_y  )

static

Definition at line 558 of file mss3.c.

Referenced by mss3_decode_frame().

static void decode_haar_block ( RangeCoder *  c, HaarBlockCoder *  hc, uint8_t *  dst, int  stride, int  block_size, int *  block  )

static

Definition at line 581 of file mss3.c.

Referenced by mss3_decode_frame().

static void reset_coders ( MSS3Context *  ctx, int  quality  )

static

Definition at line 622 of file mss3.c.

Referenced by mss3_decode_frame().

static av_cold void init_coders ( MSS3Context *  ctx )

static

Definition at line 657 of file mss3.c.

Referenced by mss3_decode_init().

static int mss3_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 677 of file mss3.c.

static av_cold int mss3_decode_init ( AVCodecContext *  avctx )

static

Definition at line 807 of file mss3.c.

static av_cold int mss3_decode_end ( AVCodecContext *  avctx )

static

Definition at line 846 of file mss3.c.

Variable Documentation

AVCodec ff_msa1_decoder

Initial value:

= {
    .name           = "msa1",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MSA1,
    .priv_data_size = sizeof(MSS3Context),
    .init           = mss3_decode_init,
    .close          = mss3_decode_end,
    .decode         = mss3_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("MS ATC Screen"),
}

Definition at line 859 of file mss3.c.