IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1. More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "msmpeg4data.h"
#include "intrax8huf.h"
#include "intrax8.h"
#include "intrax8dsp.h"
#include "mpegutils.h"

Macros
#define	MAX_TABLE_DEPTH(table_bits, max_bits) ((max_bits + table_bits - 1) / table_bits)

#define	DC_VLC_BITS 9

#define	AC_VLC_BITS 9

#define	OR_VLC_BITS 7

#define	DC_VLC_MTD MAX_TABLE_DEPTH(DC_VLC_BITS, MAX_DC_VLC_BITS)

#define	AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS)

#define	OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS)

#define	init_ac_vlc(dst, src)

#define	init_dc_vlc(dst, src)

#define	init_or_vlc(dst, src)

#define	extra_bits(eb) (eb)

#define	extra_run (0xFF << 8)

#define	extra_level (0x00 << 8)

#define	run_offset(r) ((r) << 16)

#define	level_offset(l) ((l) << 24)

#define	B(x, y) w->block[0][w->idct_permutation[(x) + (y) * 8]]

#define	T(x) ((x) * dc_level + 0x8000) >> 16;

Functions
static av_cold int	x8_vlc_init (void)

static void	x8_reset_vlc_tables (IntraX8Context *w)

static void	x8_select_ac_table (IntraX8Context *const w, int mode)

static int	x8_get_orient_vlc (IntraX8Context *w)

static void	x8_get_ac_rlf (IntraX8Context const w, const int mode, int const run, int const level, int const final)

static int	x8_get_dc_rlf (IntraX8Context const w, const int mode, int const level, int *const final)

static int	x8_setup_spatial_predictor (IntraX8Context *const w, const int chroma)

static void	x8_update_predictions (IntraX8Context *const w, const int orient, const int est_run)

static void	x8_get_prediction_chroma (IntraX8Context *const w)

static void	x8_get_prediction (IntraX8Context *const w)

static void	x8_ac_compensation (IntraX8Context *const w, const int direction, const int dc_level)

static void	dsp_x8_put_solidcolor (const uint8_t pix, uint8_t *dst, const ptrdiff_t linesize)

static int	x8_decode_intra_mb (IntraX8Context *const w, const int chroma)

static void	x8_init_block_index (IntraX8Context w, AVFrame frame)

av_cold int	ff_intrax8_common_init (AVCodecContext avctx, IntraX8Context w, IDCTDSPContext idsp, int16_t(block)[64], int block_last_index[12], int mb_width, int mb_height)
	Initialize IntraX8 frame decoder. More...

av_cold void	ff_intrax8_common_end (IntraX8Context *w)
	Destroy IntraX8 frame structure. More...

int	ff_intrax8_decode_picture (IntraX8Context w, Picture pict, GetBitContext gb, int mb_x, int *mb_y, int dquant, int quant_offset, int loopfilter, int lowdelay)
	Decode single IntraX8 frame. More...

Variables
static VLC	j_ac_vlc [2][2][8]

static VLC	j_dc_vlc [2][8]

static VLC	j_orient_vlc [2][4]

static const uint32_t	ac_decode_table []

static const uint8_t	dc_index_offset []

static const int16_t	quant_table [64]

Detailed Description

IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1.

Definition in file intrax8.c.

Macro Definition Documentation

◆ MAX_TABLE_DEPTH

#define MAX_TABLE_DEPTH	(	table_bits,
		max_bits
	)	((max_bits + table_bits - 1) / table_bits)

Definition at line 34 of file intrax8.c.

◆ DC_VLC_BITS

#define DC_VLC_BITS 9

Definition at line 37 of file intrax8.c.

Referenced by decode_dc(), decode_dc_le(), ff_mpeg12_init_vlcs(), speedhq_static_init(), and x8_get_dc_rlf().

◆ AC_VLC_BITS

#define AC_VLC_BITS 9

Definition at line 38 of file intrax8.c.

Referenced by ff_vc1_init_common(), vc1_decode_ac_coeff(), and x8_get_ac_rlf().

◆ OR_VLC_BITS

#define OR_VLC_BITS 7

Definition at line 39 of file intrax8.c.

Referenced by x8_get_orient_vlc().

◆ DC_VLC_MTD

#define DC_VLC_MTD MAX_TABLE_DEPTH(DC_VLC_BITS, MAX_DC_VLC_BITS)

Definition at line 41 of file intrax8.c.

Referenced by x8_get_dc_rlf().

◆ AC_VLC_MTD

#define AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS)

Definition at line 42 of file intrax8.c.

Referenced by x8_get_ac_rlf().

◆ OR_VLC_MTD

#define OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS)

Definition at line 43 of file intrax8.c.

Referenced by x8_get_orient_vlc().

◆ init_ac_vlc

#define init_ac_vlc	(	dst,
		src
	)

Value:

do {                                                                      \
        dst.table           = &table[offset];                                 \
        dst.table_allocated = sizes[sizeidx];                                 \
        offset             += sizes[sizeidx++];                               \
        init_vlc(&dst, AC_VLC_BITS, 77, &src[1], 4, 2, &src[0], 4, 2,         \
                 INIT_VLC_USE_NEW_STATIC);                                    \
    } while(0)

Referenced by x8_vlc_init().

◆ init_dc_vlc

#define init_dc_vlc	(	dst,
		src
	)

Value:

do {                                                                      \
        dst.table           = &table[offset];                                 \
        dst.table_allocated = sizes[sizeidx];                                 \
        offset             += sizes[sizeidx++];                               \
        init_vlc(&dst, DC_VLC_BITS, 34, &src[1], 4, 2, &src[0], 4, 2,         \
                 INIT_VLC_USE_NEW_STATIC);                                    \
    } while(0)

Referenced by x8_vlc_init().

◆ init_or_vlc

#define init_or_vlc	(	dst,
		src
	)

Value:

do {                                                                      \
        dst.table           = &table[offset];                                 \
        dst.table_allocated = sizes[sizeidx];                                 \
        offset             += sizes[sizeidx++];                               \
        init_vlc(&dst, OR_VLC_BITS, 12, &src[1], 4, 2, &src[0], 4, 2,         \
                 INIT_VLC_USE_NEW_STATIC);                                    \
    } while(0)

Referenced by x8_vlc_init().

◆ extra_bits

#define extra_bits ( eb ) (eb)

Definition at line 159 of file intrax8.c.

Referenced by decode_entropy_coded_image(), and reap_filters().

◆ extra_run

#define extra_run (0xFF << 8)

Definition at line 160 of file intrax8.c.

◆ extra_level

#define extra_level (0x00 << 8)

Definition at line 161 of file intrax8.c.

◆ run_offset

#define run_offset ( r ) ((r) << 16)

Definition at line 162 of file intrax8.c.

◆ level_offset

#define level_offset ( l ) ((l) << 24)

Definition at line 163 of file intrax8.c.

◆ B

#define B	(	x,
		y
	)	w->block[0][w->idct_permutation[(x) + (y) * 8]]

Referenced by x8_ac_compensation().

◆ T

#define T ( x ) ((x) * dc_level + 0x8000) >> 16;

Referenced by x8_ac_compensation().

Function Documentation

◆ x8_vlc_init()

static av_cold int x8_vlc_init ( void )

static

Definition at line 49 of file intrax8.c.

Referenced by ff_intrax8_common_init().

◆ x8_reset_vlc_tables()

static void x8_reset_vlc_tables ( IntraX8Context * w )

static

Definition at line 127 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

◆ x8_select_ac_table()

static void x8_select_ac_table	(	IntraX8Context *const	w,
		int	mode
	)

inlinestatic

Definition at line 134 of file intrax8.c.

Referenced by x8_decode_intra_mb().

◆ x8_get_orient_vlc()

static int x8_get_orient_vlc ( IntraX8Context * w )

inlinestatic

Definition at line 149 of file intrax8.c.

Referenced by x8_setup_spatial_predictor().

◆ x8_get_ac_rlf()

static void x8_get_ac_rlf	(	IntraX8Context *const	w,
		const int	mode,
		int *const	run,
		int *const	level,
		int *const	final
	)

static

Definition at line 206 of file intrax8.c.

Referenced by x8_decode_intra_mb().

◆ x8_get_dc_rlf()

static int x8_get_dc_rlf	(	IntraX8Context *const	w,
		const int	mode,
		int *const	level,
		int *const	final
	)

static

Definition at line 286 of file intrax8.c.

Referenced by x8_decode_intra_mb().

◆ x8_setup_spatial_predictor()

static int x8_setup_spatial_predictor	(	IntraX8Context *const	w,
		const int	chroma
	)

static

Definition at line 322 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

◆ x8_update_predictions()

static void x8_update_predictions	(	IntraX8Context *const	w,
		const int	orient,
		const int	est_run
	)

static

Definition at line 380 of file intrax8.c.

Referenced by x8_decode_intra_mb().

◆ x8_get_prediction_chroma()

static void x8_get_prediction_chroma ( IntraX8Context *const w )

static

Definition at line 390 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

◆ x8_get_prediction()

static void x8_get_prediction ( IntraX8Context *const w )

static

Definition at line 406 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

◆ x8_ac_compensation()

static void x8_ac_compensation	(	IntraX8Context *const	w,
		const int	direction,
		const int	dc_level
	)

static

Definition at line 475 of file intrax8.c.

Referenced by x8_decode_intra_mb().

◆ dsp_x8_put_solidcolor()

static void dsp_x8_put_solidcolor	(	const uint8_t	pix,
		uint8_t *	dst,
		const ptrdiff_t	linesize
	)

static

Definition at line 546 of file intrax8.c.

Referenced by x8_decode_intra_mb().

◆ x8_decode_intra_mb()

static int x8_decode_intra_mb	(	IntraX8Context *const	w,
		const int	chroma
	)

static

Definition at line 567 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

◆ x8_init_block_index()

static void x8_init_block_index	(	IntraX8Context *	w,
		AVFrame *	frame
	)

static

Definition at line 711 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

◆ ff_intrax8_common_init()

av_cold int ff_intrax8_common_init	(	AVCodecContext *	avctx,
		IntraX8Context *	w,
		IDCTDSPContext *	idsp,
		int16_t(*)	block[64],
		int	block_last_index[12],
		int	mb_width,
		int	mb_height
	)

Initialize IntraX8 frame decoder.

Parameters

avctx	pointer to AVCodecContext
w	pointer to IntraX8Context
idsp	pointer to IDCTDSPContext
block	pointer to block array
block_last_index	pointer to index array
mb_width	macroblock width
mb_height	macroblock height

Returns: 0 on success, a negative AVERROR value on error

Definition at line 728 of file intrax8.c.

Referenced by ff_vc1_decode_init_alloc_tables(), and wmv2_decode_init().

◆ ff_intrax8_common_end()

av_cold void ff_intrax8_common_end ( IntraX8Context * w )

Destroy IntraX8 frame structure.

Parameters

w	pointer to IntraX8Context

Definition at line 768 of file intrax8.c.

Referenced by ff_vc1_decode_end(), and wmv2_decode_end().

◆ ff_intrax8_decode_picture()

int ff_intrax8_decode_picture	(	IntraX8Context *	w,
		Picture *	pict,
		GetBitContext *	gb,
		int *	mb_x,
		int *	mb_y,
		int	quant,
		int	halfpq,
		int	loopfilter,
		int	lowdelay
	)

Decode single IntraX8 frame.

lowres decoding is theoretically impossible.

Parameters

w	pointer to IntraX8Context
pict	the output Picture containing an AVFrame
gb	open bitstream reader
mb_x	pointer to the x coordinate of the current macroblock
mb_y	pointer to the y coordinate of the current macroblock
dquant	doubled quantizer, it would be odd in case of VC-1 halfpq==1.
quant_offset	offset away from zero
loopfilter	enable filter after decoding a block

Definition at line 773 of file intrax8.c.

Referenced by ff_vc1_decode_blocks(), and ff_wmv2_decode_secondary_picture_header().

Variable Documentation

◆ j_ac_vlc

VLC j_ac_vlc[2][2][8]

static

Definition at line 45 of file intrax8.c.

◆ j_dc_vlc

VLC j_dc_vlc[2][8]

static

Definition at line 46 of file intrax8.c.

◆ j_orient_vlc

VLC j_orient_vlc[2][4]

static

Definition at line 47 of file intrax8.c.

◆ ac_decode_table

const uint32_t ac_decode_table[]

static

Definition at line 164 of file intrax8.c.

Referenced by x8_get_ac_rlf().

◆ dc_index_offset

const uint8_t dc_index_offset[]

static

Initial value:

= {
    0, 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
}

Definition at line 282 of file intrax8.c.

Referenced by x8_get_dc_rlf().

◆ quant_table

const int16_t quant_table[64]

static

Initial value:

= {
    256, 256, 256, 256, 256, 256, 259, 262,
    265, 269, 272, 275, 278, 282, 285, 288,
    292, 295, 299, 303, 306, 310, 314, 317,
    321, 325, 329, 333, 337, 341, 345, 349,
    353, 358, 362, 366, 371, 375, 379, 384,
    389, 393, 398, 403, 408, 413, 417, 422,
    428, 433, 438, 443, 448, 454, 459, 465,
    470, 476, 482, 488, 493, 499, 505, 511,
}

Definition at line 556 of file intrax8.c.

Referenced by x8_decode_intra_mb().

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ MAX_TABLE_DEPTH

◆ DC_VLC_BITS

◆ AC_VLC_BITS

◆ OR_VLC_BITS

◆ DC_VLC_MTD

◆ AC_VLC_MTD

◆ OR_VLC_MTD

◆ init_ac_vlc

◆ init_dc_vlc

◆ init_or_vlc

◆ extra_bits

◆ extra_run

◆ extra_level

◆ run_offset

◆ level_offset

◆ B

◆ T

Function Documentation

◆ x8_vlc_init()

◆ x8_reset_vlc_tables()

◆ x8_select_ac_table()

◆ x8_get_orient_vlc()

◆ x8_get_ac_rlf()

◆ x8_get_dc_rlf()

◆ x8_setup_spatial_predictor()

◆ x8_update_predictions()

◆ x8_get_prediction_chroma()

◆ x8_get_prediction()

◆ x8_ac_compensation()

◆ dsp_x8_put_solidcolor()

◆ x8_decode_intra_mb()

◆ x8_init_block_index()

◆ ff_intrax8_common_init()

◆ ff_intrax8_common_end()

◆ ff_intrax8_decode_picture()

Variable Documentation

◆ j_ac_vlc

◆ j_dc_vlc

◆ j_orient_vlc

◆ ac_decode_table

◆ dc_index_offset

◆ quant_table