vc1.c File Reference

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

#include "internal.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "vc1.h"
#include "vc1data.h"
#include "msmpeg4data.h"
#include "unary.h"
#include "simple_idct.h"
#include <assert.h>

Go to the source code of this file.

Macros

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

Enumerations

VC-1 Bitplane decoding
See also:
8.7, p56
enum  Imode {
  IMODE_RAW, IMODE_NORM2, IMODE_DIFF2, IMODE_NORM6,
  IMODE_DIFF6, IMODE_ROWSKIP, IMODE_COLSKIP, IMODE_RAW,
  IMODE_NORM2, IMODE_DIFF2, IMODE_NORM6, IMODE_DIFF6,
  IMODE_ROWSKIP, IMODE_COLSKIP
}
 Imode types. More...

Functions

static void decode_rowskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
 Decode rows by checking if they are skipped.
static void decode_colskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
 Decode columns by checking if they are skipped.
static int bitplane_decoding (uint8_t *data, int *raw_flag, VC1Context *v)
 Decode a bitplane's bits.
static int vop_dquant_decoding (VC1Context *v)
 VOP Dquant decoding.
static int decode_sequence_header_adv (VC1Context *v, GetBitContext *gb)
int vc1_decode_sequence_header (AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
 Decode Simple/Main Profiles sequence header.
int vc1_decode_entry_point (AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
int vc1_parse_frame_header (VC1Context *v, GetBitContext *gb)
int vc1_parse_frame_header_adv (VC1Context *v, GetBitContext *gb)

Detailed Description

VC-1 and WMV3 decoder common code.

Definition in file vc1.c.


Macro Definition Documentation

#define INIT_LUT (   lumscale,
  lumshift,
  luty,
  lutuv 
)
Value:
if (!lumscale) { \
scale = -64; \
shift = (255 - lumshift * 2) << 6; \
if (lumshift > 31) \
shift += 128 << 6; \
} else { \
scale = lumscale + 32; \
if (lumshift > 31) \
shift = (lumshift - 64) << 6; \
else \
shift = lumshift << 6; \
} \
for (i = 0; i < 256; i++) { \
luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6); \
lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6); \
}

Definition at line 800 of file vc1.c.

Referenced by vc1_parse_frame_header_adv().


Enumeration Type Documentation

enum Imode

Imode types.

Enumerator:
IMODE_RAW 
IMODE_NORM2 
IMODE_DIFF2 
IMODE_NORM6 
IMODE_DIFF6 
IMODE_ROWSKIP 
IMODE_COLSKIP 
IMODE_RAW 
IMODE_NORM2 
IMODE_DIFF2 
IMODE_NORM6 
IMODE_DIFF6 
IMODE_ROWSKIP 
IMODE_COLSKIP 

Definition at line 54 of file vc1.c.


Function Documentation

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

Decode a bitplane's bits.

Parameters:
databitplane where to store the decode bits
[out]raw_flagpointer to the flag indicating that this bitplane is not coded explicitly
vVC-1 context for bit reading and logging
Returns:
Status
Todo:
FIXME: Optimize

Definition at line 116 of file vc1.c.

Referenced by vc1_parse_frame_header(), and vc1_parse_frame_header_adv().

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:
planeBuffer to store decoded bits
[in]widthWidth of this buffer
[in]heightHeight of this buffer
[in]strideof this buffer
Todo:
FIXME: Optimize

Definition at line 93 of file vc1.c.

Referenced by bitplane_decoding().

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:
planeBuffer to store decoded bits
[in]widthWidth of this buffer
[in]heightHeight of this buffer
[in]strideof this buffer

Definition at line 71 of file vc1.c.

Referenced by bitplane_decoding().

static int decode_sequence_header_adv ( VC1Context v,
GetBitContext gb 
)
static

Definition at line 418 of file vc1.c.

Referenced by vc1_decode_sequence_header().

int vc1_decode_entry_point ( AVCodecContext avctx,
VC1Context v,
GetBitContext gb 
)

Definition at line 527 of file vc1.c.

Referenced by vc1_decode_frame(), vc1_decode_init(), and vc1_extract_headers().

int vc1_decode_sequence_header ( AVCodecContext avctx,
VC1Context v,
GetBitContext gb 
)

Decode Simple/Main Profiles sequence header.

See also:
Figure 7-8, p16-17
Parameters:
avctxCodec context
gbGetBit context initialized from Codec context extra_data
Returns:
Status

Definition at line 294 of file vc1.c.

Referenced by vc1_decode_init(), and vc1_extract_headers().

int vc1_parse_frame_header ( VC1Context v,
GetBitContext gb 
)

Definition at line 575 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_headers().

int vc1_parse_frame_header_adv ( VC1Context v,
GetBitContext gb 
)

Definition at line 818 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_headers().

static int vop_dquant_decoding ( VC1Context v)
static

VOP Dquant decoding.

Parameters:
vVC-1 Context

Definition at line 245 of file vc1.c.

Referenced by vc1_parse_frame_header(), and vc1_parse_frame_header_adv().