mss4.c File Reference

Microsoft Screen 4 (aka Microsoft Titanium Screen 2, aka Microsoft Expression Encoder Screen) decoder. More...

#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "jpegtables.h"
#include "mss34dsp.h"
#include "unary.h"

Go to the source code of this file.

Data Structures
struct	MSS4Context

Macros
#define	HEADER_SIZE   8
#define	MAX_ENTRIES   162
#define	MKVAL(vals)

Enumerations
enum	FrameType { INTRA_FRAME = 0 , INTER_FRAME , SKIP_FRAME }
enum	BlockType { SKIP_BLOCK = 0 , DCT_BLOCK , IMAGE_BLOCK }
enum	CachePos { LEFT = 0 , TOP_LEFT , TOP }

Functions
static av_cold void	mss4_init_vlc (VLC *vlc, unsigned *offset, const uint8_t *lens, const uint8_t *syms)
static av_cold void	mss4_init_vlcs (void)
static av_always_inline int	get_coeff_bits (GetBitContext *gb, int nbits)
static int	get_coeff (GetBitContext *gb, const VLC *vlc, int nb_bits, int max_depth)
static int	mss4_decode_dct (GetBitContext *gb, VLC *dc_vlc, VLC *ac_vlc, int *block, int *dc_cache, int bx, int by, uint16_t *quant_mat)
static int	mss4_decode_dct_block (MSS4Context *c, GetBitContext *gb, uint8_t *dst[3], int mb_x, int mb_y)
static void	read_vec_pos (GetBitContext *gb, int *vec_pos, int *sel_flag, int *sel_len, int *prev)
static int	get_value_cached (GetBitContext *gb, int vec_pos, uint8_t *vec, int vec_size, int component, int shift, int *prev)
static int	mss4_decode_image_block (MSS4Context *ctx, GetBitContext *gb, uint8_t *picdst[3], int mb_x, int mb_y)
static void	mss4_update_dc_cache (MSS4Context *c, int mb_x)
static int	mss4_decode_frame (AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
static av_cold int	mss4_decode_end (AVCodecContext *avctx)
static av_cold int	mss4_decode_init (AVCodecContext *avctx)

Variables
static const uint8_t	mss4_dc_vlc_lens [2][16]
static const uint8_t	vec_len_syms [2][4]
static const uint8_t	mss4_vec_entry_vlc_lens [2][16]
static const uint8_t	mss4_vec_entry_vlc_syms [2][9]
static VLC	dc_vlc [2]
static VLC	ac_vlc [2]
static VLC	vec_entry_vlc [2]
const FFCodec	ff_mts2_decoder

Detailed Description

Microsoft Screen 4 (aka Microsoft Titanium Screen 2, aka Microsoft Expression Encoder Screen) decoder.

Definition in file mss4.c.

Macro Definition Documentation

HEADER_SIZE

#define HEADER_SIZE   8

Definition at line 41 of file mss4.c.

MAX_ENTRIES

#define MAX_ENTRIES   162

Definition at line 81 of file mss4.c.

Referenced by mss4_init_vlc().

MKVAL

#define MKVAL

(

vals

)

Value:

((vals)[0] | ((vals)[1] << 3) | ((vals)[2] << 6))

Definition at line 308 of file mss4.c.

Referenced by mss4_decode_image_block().

Enumeration Type Documentation

FrameType

enum FrameType

Enumerator
INTRA_FRAME
INTER_FRAME
SKIP_FRAME

Definition at line 43 of file mss4.c.

BlockType

enum BlockType

Enumerator
SKIP_BLOCK
DCT_BLOCK
IMAGE_BLOCK

Definition at line 49 of file mss4.c.

CachePos

enum CachePos

Enumerator
LEFT
TOP_LEFT
TOP

Definition at line 55 of file mss4.c.

Function Documentation

mss4_init_vlc()

static av_cold void mss4_init_vlc ( VLC * vlc, unsigned * offset, const uint8_t * lens, const uint8_t * syms )

static

Definition at line 102 of file mss4.c.

Referenced by mss4_init_vlcs().

mss4_init_vlcs()

static av_cold void mss4_init_vlcs ( void )

static

Definition at line 125 of file mss4.c.

Referenced by mss4_decode_init().

get_coeff_bits()

static av_always_inline int get_coeff_bits ( GetBitContext * gb, int nbits )

static

Definition at line 146 of file mss4.c.

Referenced by get_coeff(), and mss4_decode_dct().

get_coeff()

static int get_coeff ( GetBitContext * gb, const VLC * vlc, int nb_bits, int max_depth )

inlinestatic

Definition at line 160 of file mss4.c.

Referenced by mss4_decode_dct(), and mss4_decode_image_block().

mss4_decode_dct()

static int mss4_decode_dct ( GetBitContext * gb, VLC * dc_vlc, VLC * ac_vlc, int * block, int * dc_cache, int bx, int by, uint16_t * quant_mat )

static

Definition at line 168 of file mss4.c.

Referenced by mss4_decode_dct_block().

mss4_decode_dct_block()

static int mss4_decode_dct_block ( MSS4Context * c, GetBitContext * gb, uint8_t * dst[3], int mb_x, int mb_y )

static

Definition at line 223 of file mss4.c.

Referenced by mss4_decode_frame().

read_vec_pos()

static void read_vec_pos ( GetBitContext * gb, int * vec_pos, int * sel_flag, int * sel_len, int * prev )

static

Definition at line 271 of file mss4.c.

Referenced by mss4_decode_image_block().

get_value_cached()

static int get_value_cached ( GetBitContext * gb, int vec_pos, uint8_t * vec, int vec_size, int component, int shift, int * prev )

static

Definition at line 297 of file mss4.c.

Referenced by mss4_decode_image_block().

mss4_decode_image_block()

static int mss4_decode_image_block ( MSS4Context * ctx, GetBitContext * gb, uint8_t * picdst[3], int mb_x, int mb_y )

static

Definition at line 321 of file mss4.c.

Referenced by mss4_decode_frame().

mss4_update_dc_cache()

static void mss4_update_dc_cache ( MSS4Context * c, int mb_x )

inlinestatic

Definition at line 431 of file mss4.c.

Referenced by mss4_decode_frame().

mss4_decode_frame()

static int mss4_decode_frame ( AVCodecContext * avctx, AVFrame * rframe, int * got_frame, AVPacket * avpkt )

static

Definition at line 450 of file mss4.c.

mss4_decode_end()

static av_cold int mss4_decode_end ( AVCodecContext * avctx )

static

Definition at line 579 of file mss4.c.

mss4_decode_init()

static av_cold int mss4_decode_init ( AVCodecContext * avctx )

static

Definition at line 591 of file mss4.c.

Variable Documentation

mss4_dc_vlc_lens

const uint8_t mss4_dc_vlc_lens[2][16]

static

Initial value:

= {
    { 0, 1, 5, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0 },
    { 0, 3, 1, 1, 1, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0 }
}

Definition at line 61 of file mss4.c.

Referenced by mss4_init_vlcs().

vec_len_syms

const uint8_t vec_len_syms[2][4]

static

Initial value:

= {
    { 4, 2, 3, 1 },
    { 4, 1, 2, 3 }
}

Definition at line 66 of file mss4.c.

Referenced by mss4_decode_image_block().

mss4_vec_entry_vlc_lens

const uint8_t mss4_vec_entry_vlc_lens[2][16]

static

Initial value:

= {
    { 0, 2, 2, 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
    { 0, 1, 5, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
}

Definition at line 71 of file mss4.c.

Referenced by mss4_init_vlcs().

mss4_vec_entry_vlc_syms

const uint8_t mss4_vec_entry_vlc_syms[2][9]

static

Initial value:

= {
    { 0, 7, 6, 5, 8, 4, 3, 1, 2 },
    { 0, 2, 3, 4, 5, 6, 7, 1, 8 }
}

Definition at line 76 of file mss4.c.

Referenced by mss4_init_vlcs().

dc_vlc

VLC dc_vlc[2]

static

Definition at line 99 of file mss4.c.

ac_vlc

VLC ac_vlc[2]

static

Definition at line 99 of file mss4.c.

vec_entry_vlc

VLC vec_entry_vlc[2]

static

Definition at line 100 of file mss4.c.

Referenced by mss4_decode_image_block(), and mss4_init_vlcs().

ff_mts2_decoder

const FFCodec ff_mts2_decoder

Initial value:

= {
    .p.name         = "mts2",
    CODEC_LONG_NAME("MS Expression Encoder Screen"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_MTS2,
    .priv_data_size = sizeof(MSS4Context),
    .init           = mss4_decode_init,
    .close          = mss4_decode_end,
    FF_CODEC_DECODE_CB(mss4_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 617 of file mss4.c.