mss2.c File Reference

#include "libavutil/avassert.h"
#include "codec_internal.h"
#include "decode.h"
#include "error_resilience.h"
#include "mpeg_er.h"
#include "mpegvideodec.h"
#include "qpeldsp.h"
#include "vc1.h"
#include "wmv2data.h"
#include "mss12.h"
#include "mss2dsp.h"

Go to the source code of this file.

Data Structures
struct	MSS2Context
struct	Rectangle
struct	Rectangle2

Macros
#define	READ_PAIR(a, b)
#define	COMPARE(top, bottom, left, right)
#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 (AVCodecContext *avctx, GetByteContext *gB, uint16_t *dst, ptrdiff_t stride, int keyframe, int w, int h)
static int	decode_rle (GetBitContext *gb, uint8_t *pal_dst, ptrdiff_t pal_stride, uint8_t *rgb_dst, ptrdiff_t 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 void	calc_draw_region (struct Rectangle2 *draw, const struct Rectangle2 *rect)
static int	calc_split_position (int split_position, const struct Rectangle2 *rect, int height)
static int	mss2_decode_frame (AVCodecContext *avctx, AVFrame *frame, 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
const FFCodec	ff_mss2_decoder

Detailed Description

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

Definition in file mss2.c.

Macro Definition Documentation

READ_PAIR

#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);      \

COMPARE

#define COMPARE	(		top,
			bottom,
			left,
			right
	)

Value:

    if (rect->top <= draw->top && rect->bottom >= draw->bottom) { \
        if (rect->left <= draw->left && rect->right >= draw->left) \
            draw->left = FFMIN(rect->right, draw->right); \
        \
        if (rect->right >= draw->right) { \
            if (rect->left >= draw->left) { \
                if (rect->left < draw->right) \
                    draw->right = rect->left; \
            } else { \
                draw->right = draw->left; \
            } \
        } \
    }

MAX_WMV9_RECTANGLES

#define MAX_WMV9_RECTANGLES   20

Definition at line 503 of file mss2.c.

ARITH2_PADDING

#define ARITH2_PADDING   2

Definition at line 504 of file mss2.c.

Function Documentation

arith2_normalise()

static void arith2_normalise ( ArithCoder *  c )

static

Definition at line 47 of file mss2.c.

Referenced by arith2_get_number().

arith2_get_scaled_value()

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

static

Definition at line 66 of file mss2.c.

Referenced by arith2_get_number(), and arith2_get_prob().

arith2_rescale_interval()

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

static

Definition at line 76 of file mss2.c.

Referenced by arith2_get_number(), and arith2_get_prob().

arith2_get_number()

static int arith2_get_number ( ArithCoder *  c, int  n  )

static

Definition at line 94 of file mss2.c.

Referenced by arith2_init(), and mss2_decode_frame().

arith2_get_prob()

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

static

Definition at line 114 of file mss2.c.

arith2_get_consumed_bytes()

static int arith2_get_consumed_bytes ( ArithCoder *  c )

static

Definition at line 136 of file mss2.c.

Referenced by mss2_decode_frame().

arith2_init()

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

static

Definition at line 150 of file mss2.c.

Referenced by mss2_decode_frame().

decode_pal_v2()

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

static

Definition at line 161 of file mss2.c.

Referenced by mss2_decode_frame().

decode_555()

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

static

Definition at line 178 of file mss2.c.

Referenced by mss2_decode_frame().

decode_rle()

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

static

Definition at line 241 of file mss2.c.

Referenced by mss2_decode_frame().

decode_wmv9()

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 378 of file mss2.c.

Referenced by mss2_decode_frame().

calc_draw_region()

static void calc_draw_region ( struct Rectangle2 *  draw, const struct Rectangle2 *  rect  )

static

Definition at line 474 of file mss2.c.

Referenced by mss2_decode_frame().

calc_split_position()

static int calc_split_position ( int  split_position, const struct Rectangle2 *  rect, int  height  )

static

Definition at line 495 of file mss2.c.

Referenced by mss2_decode_frame().

mss2_decode_frame()

static int mss2_decode_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 506 of file mss2.c.

wmv9_init()

static av_cold int wmv9_init ( AVCodecContext *  avctx )

static

Definition at line 810 of file mss2.c.

Referenced by mss2_decode_init().

mss2_decode_end()

static av_cold int mss2_decode_end ( AVCodecContext *  avctx )

static

Definition at line 863 of file mss2.c.

mss2_decode_init()

static av_cold int mss2_decode_init ( AVCodecContext *  avctx )

static

Definition at line 877 of file mss2.c.

Variable Documentation

ff_mss2_decoder

const FFCodec ff_mss2_decoder

Initial value:

= {
    .p.name         = "mss2",
    CODEC_LONG_NAME("MS Windows Media Video V9 Screen"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_MSS2,
    .priv_data_size = sizeof(MSS2Context),
    .init           = mss2_decode_init,
    .close          = mss2_decode_end,
    FF_CODEC_DECODE_CB(mss2_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 902 of file mss2.c.