mss2.c File Reference

Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder. More...

#include "libavutil/avassert.h"
#include "error_resilience.h"
#include "internal.h"
#include "msmpeg4data.h"
#include "vc1.h"
#include "mss12.h"
#include "mss2dsp.h"

Go to the source code of this file.

Data Structures
struct	MSS2Context
struct	Rectangle

Macros
#define	READ_PAIR(a, b)
#define	MAX_WMV9_RECTANGLES   20
#define	ARITH2_PADDING   2

Functions
static void	arith2_normalise (ArithCoder *c)
static int	arith2_get_scaled_value (int value, int n, int range)
static void	arith2_rescale_interval (ArithCoder *c, int range, int low, int high, int n)
static int	arith2_get_number (ArithCoder *c, int n)
static int	arith2_get_prob (ArithCoder *c, int16_t *probs)
static int	arith2_get_consumed_bytes (ArithCoder *c)
static void	arith2_init (ArithCoder *c, GetByteContext *gB)
static int	decode_pal_v2 (MSS12Context *ctx, const uint8_t *buf, int buf_size)
static int	decode_555 (GetByteContext *gB, uint16_t *dst, int stride, int keyframe, int w, int h)
static int	decode_rle (GetBitContext *gb, uint8_t *pal_dst, int pal_stride, uint8_t *rgb_dst, int rgb_stride, uint32_t *pal, int keyframe, int kf_slipt, int slice, int w, int h)
static int	decode_wmv9 (AVCodecContext *avctx, const uint8_t *buf, int buf_size, int x, int y, int w, int h, int wmv9_mask)
static int	mss2_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int	wmv9_init (AVCodecContext *avctx)
static av_cold int	mss2_decode_end (AVCodecContext *avctx)
static av_cold int	mss2_decode_init (AVCodecContext *avctx)

Variables
AVCodec	ff_mss2_decoder

Detailed Description

Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder.

Definition in file mss2.c.

Macro Definition Documentation

#define READ_PAIR	(		a,
			b
	)

Value:

a  = bytestream2_get_byte(gB) << 4; \
    t  = bytestream2_get_byte(gB);      \
    a |= t >> 4;                        \
    b  = (t & 0xF) << 8;                \
    b |= bytestream2_get_byte(gB);      \

Referenced by decode_555().

#define MAX_WMV9_RECTANGLES   20

Definition at line 462 of file mss2.c.

Referenced by mss2_decode_frame().

#define ARITH2_PADDING   2

Definition at line 463 of file mss2.c.

Referenced by mss2_decode_frame().

Function Documentation

static void arith2_normalise ( ArithCoder *  c )

static

Definition at line 43 of file mss2.c.

Referenced by arith2_get_number().

static int arith2_get_scaled_value ( int  value, int  n, int  range  )

static

Definition at line 62 of file mss2.c.

Referenced by arith2_get_number(), and arith2_get_prob().

static void arith2_rescale_interval ( ArithCoder *  c, int  range, int  low, int  high, int  n  )

static

Definition at line 72 of file mss2.c.

Referenced by arith2_get_number(), and arith2_get_prob().

static int arith2_get_number ( ArithCoder *  c, int  n  )

static

Definition at line 90 of file mss2.c.

Referenced by arith2_init(), and mss2_decode_frame().

static int arith2_get_prob ( ArithCoder *  c, int16_t *  probs  )

static

Definition at line 110 of file mss2.c.

static int arith2_get_consumed_bytes ( ArithCoder *  c )

static

Definition at line 132 of file mss2.c.

Referenced by mss2_decode_frame().

static void arith2_init ( ArithCoder *  c, GetByteContext *  gB  )

static

Definition at line 146 of file mss2.c.

Referenced by mss2_decode_frame().

static int decode_pal_v2 ( MSS12Context *  ctx, const uint8_t *  buf, int  buf_size  )

static

Definition at line 156 of file mss2.c.

Referenced by mss2_decode_frame().

static int decode_555 ( GetByteContext *  gB, uint16_t *  dst, int  stride, int  keyframe, int  w, int  h  )

static

Definition at line 173 of file mss2.c.

Referenced by mss2_decode_frame().

static int decode_rle ( GetBitContext *  gb, uint8_t *  pal_dst, int  pal_stride, uint8_t *  rgb_dst, int  rgb_stride, uint32_t *  pal, int  keyframe, int  kf_slipt, int  slice, int  w, int  h  )

static

Definition at line 231 of file mss2.c.

Referenced by mss2_decode_frame().

static int decode_wmv9 ( AVCodecContext *  avctx, const uint8_t *  buf, int  buf_size, int  x, int  y, int  w, int  h, int  wmv9_mask  )

static

Definition at line 368 of file mss2.c.

Referenced by mss2_decode_frame().

static int mss2_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 465 of file mss2.c.

static av_cold int wmv9_init ( AVCodecContext *  avctx )

static

Definition at line 740 of file mss2.c.

Referenced by mss2_decode_init().

static av_cold int mss2_decode_end ( AVCodecContext *  avctx )

static

Definition at line 801 of file mss2.c.

Referenced by mss2_decode_init().

static av_cold int mss2_decode_init ( AVCodecContext *  avctx )

static

Definition at line 815 of file mss2.c.

Variable Documentation

AVCodec ff_mss2_decoder

Initial value:

= {
    .name           = "mss2",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MSS2,
    .priv_data_size = sizeof(MSS2Context),
    .init           = mss2_decode_init,
    .close          = mss2_decode_end,
    .decode         = mss2_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
}

Definition at line 842 of file mss2.c.