vc1.c File Reference

#include "avcodec.h"
#include "decode.h"
#include "mpegvideo.h"
#include "vc1.h"
#include "vc1data.h"
#include "wmv2data.h"
#include "unary.h"

Go to the source code of this file.

Macros
#define	INIT_LUT(lumscale, lumshift, luty, lutuv, chain)
#define	ROTATE(DEF, L, N, C, A)

Functions
static int	vop_dquant_decoding (VC1Context *v)
	VOP Dquant decoding. More...
static int	decode_sequence_header_adv (VC1Context *v, GetBitContext *gb)
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)
static void	rotate_luts (VC1Context *v)
static int	read_bfraction (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)
VC-1 Bitplane decoding
See also 8.7, p56
static void	decode_rowskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
	Decode rows by checking if they are skipped. More...
static void	decode_colskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
	Decode columns by checking if they are skipped. More...
static int	bitplane_decoding (uint8_t *data, int *raw_flag, VC1Context *v)
	Decode a bitplane's bits. More...

Detailed Description

VC-1 and WMV3 decoder common code

Definition in file vc1.c.

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)

Definition at line 557 of file vc1.c.

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

decode_rowskip()

static void decode_rowskip ( uint8_t *  plane, int  width, int  height, int  stride, GetBitContext *  gb  )

static

Decode rows by checking if they are skipped.

Parameters

	plane	Buffer to store decoded bits
[in]	width	Width of this buffer
[in]	height	Height of this buffer
[in]	stride	of this buffer

Definition at line 50 of file vc1.c.

Referenced by bitplane_decoding().

decode_colskip()

static void decode_colskip ( uint8_t *  plane, int  width, int  height, int  stride, GetBitContext *  gb  )

static

Decode columns by checking if they are skipped.

Parameters

	plane	Buffer to store decoded bits
[in]	width	Width of this buffer
[in]	height	Height of this buffer
[in]	stride	of this buffer

Todo:

FIXME: Optimize

Definition at line 72 of file vc1.c.

Referenced by bitplane_decoding().

bitplane_decoding()

static int bitplane_decoding ( uint8_t *  data, int *  raw_flag, VC1Context *  v  )

static

Decode a bitplane's bits.

Parameters

	data	bitplane where to store the decode bits
[out]	raw_flag	pointer to the flag indicating that this bitplane is not coded explicitly
	v	VC-1 context for bit reading and logging

Returns

Status

Todo:

FIXME: Optimize

Definition at line 95 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), and ff_vc1_parse_frame_header_adv().

vop_dquant_decoding()

static int vop_dquant_decoding ( VC1Context *  v )

static

VOP Dquant decoding.

Parameters

v	VC-1 Context

Definition at line 228 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), and ff_vc1_parse_frame_header_adv().

decode_sequence_header_adv()

static int decode_sequence_header_adv ( VC1Context *  v, GetBitContext *  gb  )

static

Definition at line 385 of file vc1.c.

Referenced by ff_vc1_decode_sequence_header().

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

Definition at line 274 of file vc1.c.

Referenced by vc1_decode_init(), and vc1_extract_header().

ff_vc1_decode_entry_point()

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

Definition at line 496 of file vc1.c.

Referenced by vc1_decode_frame(), vc1_decode_init(), and vc1_extract_header().

rotate_luts()

static void rotate_luts ( VC1Context *  v )

static

Definition at line 579 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), and ff_vc1_parse_frame_header_adv().

read_bfraction()

static int read_bfraction ( VC1Context *  v, GetBitContext *  gb  )

static

Definition at line 602 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), and ff_vc1_parse_frame_header_adv().

ff_vc1_parse_frame_header()

int ff_vc1_parse_frame_header	(	VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 617 of file vc1.c.

Referenced by decode_wmv9(), vc1_decode_frame(), and vc1_extract_header().

ff_vc1_parse_frame_header_adv()

int ff_vc1_parse_frame_header_adv	(	VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 839 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_header().