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
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)

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
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...

Variables
static const uint32_t	vc1_ac_tables [AC_MODES][186][2]

static const uint16_t	vlc_offs []

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 570 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), ff_vc1_parse_frame_header_adv(), and rotate_luts().

◆ 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)

Referenced by rotate_luts().

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 52 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 74 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 97 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 230 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 402 of file vc1.c.

Referenced by ff_vc1_decode_sequence_header(), and vop_dquant_decoding().

◆ 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 276 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 509 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 592 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 615 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 627 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 846 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_header().

◆ ff_vc1_init_common()

av_cold int ff_vc1_init_common ( VC1Context * v )

Init VC-1 specific tables and VC1Context members.

Parameters

v	The VC1Context to initialize

Returns: Status

Definition at line 1578 of file vc1.c.

Referenced by vc1_decode_init(), vc1_parse_init(), and wmv9_init().

Variable Documentation

◆ vc1_ac_tables

const uint32_t vc1_ac_tables[AC_MODES][186][2]

static

Definition at line 1342 of file vc1.c.

Referenced by ff_vc1_init_common().

◆ vlc_offs

const uint16_t vlc_offs[]

static

Initial value:

= {
        0,   520,   552,   616,  1128,  1160,  1224,  1740,  1772,  1836,  1900,  2436,
     2986,  3050,  3610,  4154,  4218,  4746,  5326,  5390,  5902,  6554,  7658,  8342,
     9304,  9988, 10630, 11234, 12174, 13006, 13560, 14232, 14786, 15432, 16350, 17522,
    20372, 21818, 22330, 22394, 23166, 23678, 23742, 24820, 25332, 25396, 26460, 26980,
    27048, 27592, 27600, 27608, 27616, 27624, 28224, 28258, 28290, 28802, 28834, 28866,
    29378, 29412, 29444, 29960, 29994, 30026, 30538, 30572, 30604, 31120, 31154, 31186,
    31714, 31746, 31778, 32306, 32340, 32372
}

Definition at line 1563 of file vc1.c.

Referenced by ff_vc1_init_common().

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ INIT_LUT

◆ ROTATE

Function Documentation

◆ decode_rowskip()

◆ decode_colskip()

◆ bitplane_decoding()

◆ vop_dquant_decoding()

◆ decode_sequence_header_adv()

◆ ff_vc1_decode_sequence_header()

◆ ff_vc1_decode_entry_point()

◆ rotate_luts()

◆ read_bfraction()

◆ ff_vc1_parse_frame_header()

◆ ff_vc1_parse_frame_header_adv()

◆ ff_vc1_init_common()

Variable Documentation

◆ vc1_ac_tables

◆ vlc_offs