VC-1 and WMV3 decoder common code. More...

#include "libavutil/attributes.h"
#include "internal.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "vc1.h"
#include "vc1data.h"
#include "wmv2data.h"
#include "unary.h"
#include "simple_idct.h"

Macros
#define	INIT_LUT(lumscale, lumshift, luty, lutuv, chain)

#define	ROTATE(DEF, L, N, C, A)

Functions
int	ff_vc1_decode_sequence_header (AVCodecContext avctx, VC1Context v, GetBitContext *gb)
	Decode Simple/Main Profiles sequence header. More...

int	ff_vc1_decode_entry_point (AVCodecContext avctx, VC1Context v, GetBitContext *gb)

int	ff_vc1_parse_frame_header (VC1Context v, GetBitContext gb)

int	ff_vc1_parse_frame_header_adv (VC1Context v, GetBitContext gb)

av_cold int	ff_vc1_init_common (VC1Context *v)
	Init VC-1 specific tables and VC1Context members. More...

VC-1 Bitplane decoding
See also 8.7, p56

Detailed Description

VC-1 and WMV3 decoder common code.

Macro Definition Documentation

§ INIT_LUT

#define INIT_LUT	(	lumscale,
		lumshift,
		luty,
		lutuv,
		chain
	)

Value:

do {                 \
        int scale, shift, i;                                                  \
        if (!lumscale) {                                                      \
            scale = -64;                                                      \
            shift = (255 - lumshift * 2) * 64;                                \
            if (lumshift > 31)                                                \
                shift += 128 << 6;                                            \
        } else {                                                              \
            scale = lumscale + 32;                                            \
            if (lumshift > 31)                                                \
                shift = (lumshift - 64) * 64;                                 \
            else                                                              \
                shift = lumshift << 6;                                        \
        }                                                                     \
        for (i = 0; i < 256; i++) {                                           \
            int iy = chain ? luty[i]  : i;                                    \
            int iu = chain ? lutuv[i] : i;                                    \
            luty[i]  = av_clip_uint8((scale * iy + shift + 32) >> 6);         \
            lutuv[i] = av_clip_uint8((scale * (iu - 128) + 128*64 + 32) >> 6);\
        }                                                                     \
    } while(0)

§ ROTATE

#define ROTATE	(	DEF,
		L,
		N,
		C,
		A
	)

Value:

do {                          \
        if (v->s.pict_type == AV_PICTURE_TYPE_BI || v->s.pict_type == AV_PICTURE_TYPE_B) { \
            C = A;                                            \
        } else {                                              \
            DEF;                                              \
            memcpy(&tmp, L   , sizeof(tmp));                  \
            memcpy(L   , N   , sizeof(tmp));                  \
            memcpy(N   , &tmp, sizeof(tmp));                  \
            C = N;                                            \
        }                                                     \
    } while(0)

Function Documentation

§ ff_vc1_decode_sequence_header()

int ff_vc1_decode_sequence_header	(	AVCodecContext *	avctx,
		VC1Context *	v,
		GetBitContext *	gb
	)

Decode Simple/Main Profiles sequence header.

See also: Figure 7-8, p16-17

Parameters

avctx	Codec context
gb	GetBit context initialized from Codec context extra_data

Returns: Status

§ ff_vc1_init_common()

av_cold int ff_vc1_init_common ( VC1Context * v )

Init VC-1 specific tables and VC1Context members.