4xm.c File Reference

4XM codec. More...

#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#include "get_bits.h"
#include "internal.h"
#include "libavutil/avassert.h"

Go to the source code of this file.

Data Structures
struct	CFrameBuffer
struct	FourXContext

Macros
#define	BLOCK_TYPE_VLC_BITS   5
#define	ACDC_VLC_BITS   9
#define	CFRAME_BUFFER_COUNT   100
#define	FIX_1_082392200   70936
#define	FIX_1_414213562   92682
#define	FIX_1_847759065   121095
#define	FIX_2_613125930   171254
#define	MULTIPLY(var, const)   (((var) * (const)) >> 16)
#define	LE_CENTRIC_MUL(dst, src, scale, dc)

Functions
static void	idct (int16_t block[64])
static av_cold void	init_vlcs (FourXContext *f)
static void	init_mv (FourXContext *f)
static void	mcdc (uint16_t *dst, const uint16_t *src, int log2w, int h, int stride, int scale, unsigned dc)
static void	decode_p_block (FourXContext *f, uint16_t *dst, uint16_t *src, int log2w, int log2h, int stride)
static int	decode_p_frame (FourXContext *f, const uint8_t *buf, int length)
static int	decode_i_block (FourXContext *f, int16_t *block)
	decode block and dequantize.
static void	idct_put (FourXContext *f, int x, int y)
static int	decode_i_mb (FourXContext *f)
static const uint8_t *	read_huffman_tables (FourXContext *f, const uint8_t *const buf, int buf_size)
static int	mix (int c0, int c1)
static int	decode_i2_frame (FourXContext *f, const uint8_t *buf, int length)
static int	decode_i_frame (FourXContext *f, const uint8_t *buf, int length)
static int	decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int	decode_init (AVCodecContext *avctx)
static av_cold int	decode_end (AVCodecContext *avctx)

Variables
static const uint8_t	block_type_tab [2][4][8][2]
static const uint8_t	size2index [4][4]
static const int8_t	mv [256][2]
static const uint8_t	dequant_table [64]
static VLC	block_type_vlc [2][4]
AVCodec	ff_fourxm_decoder

Detailed Description

4XM codec.

Definition in file 4xm.c.

Macro Definition Documentation

#define BLOCK_TYPE_VLC_BITS   5

Definition at line 36 of file 4xm.c.

Referenced by decode_p_block(), and init_vlcs().

#define ACDC_VLC_BITS   9

Definition at line 37 of file 4xm.c.

Referenced by decode_i_block(), decode_i_frame(), and read_huffman_tables().

#define CFRAME_BUFFER_COUNT   100

Definition at line 39 of file 4xm.c.

Referenced by decode_end(), and decode_frame().

#define FIX_1_082392200   70936

Definition at line 149 of file 4xm.c.

Referenced by idct().

#define FIX_1_414213562   92682

Definition at line 150 of file 4xm.c.

Referenced by idct().

#define FIX_1_847759065   121095

Definition at line 151 of file 4xm.c.

Referenced by idct().

#define FIX_2_613125930   171254

Definition at line 152 of file 4xm.c.

Referenced by idct().

#define MULTIPLY	(		var,
			const
	)		(((var) * (const)) >> 16)

Definition at line 154 of file 4xm.c.

Referenced by idct().

#define LE_CENTRIC_MUL	(		dst,
			src,
			scale,
			dc
	)

Value:

{                                                    \
        unsigned tmpval = AV_RN32(src) * (scale) + (dc); \
        AV_WN32A(dst, tmpval);                           \
    }

Definition at line 280 of file 4xm.c.

Referenced by mcdc().

Function Documentation

static void idct ( int16_t  block[64] )

static

Definition at line 156 of file 4xm.c.

Referenced by idct_put().

static av_cold void init_vlcs ( FourXContext *  f )

static

Definition at line 241 of file 4xm.c.

Referenced by decode_init().

static void init_mv ( FourXContext *  f )

static

Definition at line 258 of file 4xm.c.

Referenced by decode_p_frame().

static void mcdc ( uint16_t *  dst, const uint16_t *  src, int  log2w, int  h, int  stride, int  scale, unsigned  dc  )

inlinestatic

Definition at line 287 of file 4xm.c.

Referenced by decode_p_block().

static void decode_p_block ( FourXContext *  f, uint16_t *  dst, uint16_t *  src, int  log2w, int  log2h, int  stride  )

static

Definition at line 335 of file 4xm.c.

Referenced by decode_p_frame().

static int decode_p_frame ( FourXContext *  f, const uint8_t *  buf, int  length  )

static

Definition at line 407 of file 4xm.c.

Referenced by decode_frame().

static int decode_i_block ( FourXContext *  f, int16_t *  block  )

static

decode block and dequantize.

Note this is almost identical to MJPEG.

Definition at line 474 of file 4xm.c.

Referenced by decode_i_mb().

static void idct_put ( FourXContext *  f, int  x, int  y  )

inlinestatic

Definition at line 522 of file 4xm.c.

Referenced by decode_i_frame(), and dv_decode_video_segment().

static int decode_i_mb ( FourXContext *  f )

static

Definition at line 568 of file 4xm.c.

Referenced by decode_i_frame().

static const uint8_t* read_huffman_tables ( FourXContext *  f, const uint8_t *const  buf, int  buf_size  )

static

Definition at line 582 of file 4xm.c.

Referenced by decode_i_frame().

static int mix ( int  c0, int  c1  )

static

Definition at line 677 of file 4xm.c.

Referenced by decode_i2_frame().

static int decode_i2_frame ( FourXContext *  f, const uint8_t *  buf, int  length  )

static

Definition at line 685 of file 4xm.c.

Referenced by decode_frame().

static int decode_i_frame ( FourXContext *  f, const uint8_t *  buf, int  length  )

static

Definition at line 734 of file 4xm.c.

Referenced by decode_frame().

static int decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 798 of file 4xm.c.

static av_cold int decode_init ( AVCodecContext *  avctx )

static

Definition at line 941 of file 4xm.c.

static av_cold int decode_end ( AVCodecContext *  avctx )

static

Definition at line 976 of file 4xm.c.

Variable Documentation

const uint8_t block_type_tab[2][4][8][2]

static

Initial value:

= {
    {
        {    
            { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 }
        }, { 
            { 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 }
        }, { 
            { 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 }
        }, { 
            { 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }
        }
    }, {
        {   
            { 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
        }, {
            { 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
        }, {
            { 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
        }, {
            { 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 }
      }
    }
}

Definition at line 41 of file 4xm.c.

Referenced by init_vlcs().

const uint8_t size2index[4][4]

static

Initial value:

= {
    { -1, 3, 1, 1 },
    {  3, 0, 0, 0 },
    {  2, 0, 0, 0 },
    {  2, 0, 0, 0 },
}

Definition at line 65 of file 4xm.c.

Referenced by decode_p_block().

const int8_t mv[256][2]

static

Definition at line 72 of file 4xm.c.

Referenced by av_register_all(), decode_13(), dwt_decode53(), dwt_decode97(), dwt_encode53(), dwt_encode97(), encode_frame(), fetch_diagonal_mv(), ff_mpeg1_encode_init(), ff_msmpeg4_decode_init(), ff_msmpeg4_decode_motion(), ff_msmpeg4_encode_motion(), ff_print_debug_info2(), fill_decode_caches(), find_motion(), h263_get_modb(), h264_er_decode_mb(), init_mv(), init_mv_penalty_and_fcode(), mpeg_er_decode_mb(), mv_read_header(), mv_read_packet(), mv_read_seek(), parse_global_var(), pred_pskip_motion(), pred_spatial_direct_motion(), svq1_motion_inter_4v_block(), svq1_motion_inter_block(), svq3_mc_dir(), vc1_apply_p_h_loop_filter(), vc1_apply_p_v_loop_filter(), vp56_decode_4mv(), vp56_decode_mv(), and vp8_mc_part().

const uint8_t dequant_table[64]

static

Initial value:

= {
    16, 15, 13, 19, 24, 31, 28, 17,
    17, 23, 25, 31, 36, 63, 45, 21,
    18, 24, 27, 37, 52, 59, 49, 20,
    16, 28, 34, 40, 60, 80, 51, 20,
    18, 31, 48, 66, 68, 86, 56, 21,
    19, 38, 56, 59, 64, 64, 48, 20,
    27, 48, 55, 55, 56, 51, 35, 15,
    20, 35, 34, 32, 31, 22, 15,  8,
}

Definition at line 109 of file 4xm.c.

Referenced by decode_i_block(), and fill_tone_level_array().

VLC block_type_vlc[2][4]

static

Definition at line 120 of file 4xm.c.

AVCodec ff_fourxm_decoder

Initial value:

= {
    .name           = "4xm",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_4XM,
    .priv_data_size = sizeof(FourXContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("4X Movie"),
}

Definition at line 998 of file 4xm.c.