libavcodec/mss2.c File Reference

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

#include "libavutil/avassert.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
Defines
#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 *data_size, 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.

---

Define Documentation

#define ARITH2_PADDING   2

Definition at line 461 of file mss2.c.

Referenced by mss2_decode_frame().

#define MAX_WMV9_RECTANGLES   20

Definition at line 460 of file mss2.c.

Referenced by mss2_decode_frame().

#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().

---

Function Documentation

static int arith2_get_consumed_bytes

(

ArithCoder *

c

)

[static]

Definition at line 131 of file mss2.c.

Referenced by mss2_decode_frame().

static int arith2_get_number	(	ArithCoder *	c,
		int	n
	)			[static]

Definition at line 89 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 109 of file mss2.c.

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

Definition at line 61 of file mss2.c.

Referenced by arith2_get_number(), and arith2_get_prob().

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

Definition at line 145 of file mss2.c.

Referenced by mss2_decode_frame().

static void arith2_normalise

(

ArithCoder *

c

)

[static]

Definition at line 42 of file mss2.c.

Referenced by arith2_get_number().

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

Definition at line 71 of file mss2.c.

Referenced by arith2_get_number(), and arith2_get_prob().

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

Definition at line 172 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 155 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 230 of file mss2.c.

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 367 of file mss2.c.

Referenced by mss2_decode_frame().

static av_cold int mss2_decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 812 of file mss2.c.

Referenced by mss2_decode_init().

static int mss2_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			[static]

Definition at line 463 of file mss2.c.

static av_cold int mss2_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 829 of file mss2.c.

static av_cold int wmv9_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 749 of file mss2.c.

Referenced by mss2_decode_init().

---

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 857 of file mss2.c.