intrax8.c File Reference

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"

Go to the source code of this file.

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 int 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 *const 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

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

Definition at line 34 of file intrax8.c.

#define DC_VLC_BITS   9

Definition at line 37 of file intrax8.c.

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

#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().

#define OR_VLC_BITS   7

Definition at line 39 of file intrax8.c.

Referenced by x8_get_orient_vlc().

#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().

#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().

#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().

#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().

#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().

#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().

#define extra_bits

(

eb

)

(eb)

Definition at line 159 of file intrax8.c.

Referenced by decode_entropy_coded_image(), and reap_filters().

#define extra_run   (0xFF << 8)

Definition at line 160 of file intrax8.c.

#define extra_level   (0x00 << 8)

Definition at line 161 of file intrax8.c.

#define run_offset

(

r

)

((r) << 16)

Definition at line 162 of file intrax8.c.

#define level_offset

(

l

)

((l) << 24)

Definition at line 163 of file intrax8.c.

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

Referenced by x8_ac_compensation().

#define T

(

x

)

((x) * dc_level + 0x8000) >> 16;

Referenced by x8_ac_compensation().

Function Documentation

static av_cold int x8_vlc_init ( void  )

static

Definition at line 49 of file intrax8.c.

Referenced by ff_intrax8_common_init().

static void x8_reset_vlc_tables ( IntraX8Context *  w )

static

Definition at line 127 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

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().

static int x8_get_orient_vlc ( IntraX8Context *  w )

inlinestatic

Definition at line 149 of file intrax8.c.

Referenced by x8_setup_spatial_predictor().

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().

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().

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().

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().

static void x8_get_prediction_chroma ( IntraX8Context *const  w )

static

Definition at line 390 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

static void x8_get_prediction ( IntraX8Context *const  w )

static

Definition at line 406 of file intrax8.c.

Referenced by ff_intrax8_decode_picture().

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().

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

static

Definition at line 546 of file intrax8.c.

Referenced by 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().

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().

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().

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().

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

VLC j_ac_vlc[2][2][8]

static

Definition at line 45 of file intrax8.c.

VLC j_dc_vlc[2][8]

static

Definition at line 46 of file intrax8.c.

VLC j_orient_vlc[2][4]

static

Definition at line 47 of file intrax8.c.

const uint32_t ac_decode_table[]

static

Definition at line 164 of file intrax8.c.

Referenced by x8_get_ac_rlf().

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().

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().