cdgraphics.c File Reference

CD Graphics Video Decoder. More...

#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"

Go to the source code of this file.

Data Structures
struct	CDGraphicsContext

Macros
#define	CDG_FULL_WIDTH   300
	default screen sizes More...
#define	CDG_FULL_HEIGHT   216
#define	CDG_DISPLAY_WIDTH   294
#define	CDG_DISPLAY_HEIGHT   204
#define	CDG_BORDER_WIDTH   6
#define	CDG_BORDER_HEIGHT   12
#define	CDG_COMMAND   0x09
	masks More...
#define	CDG_MASK   0x3F
#define	CDG_INST_MEMORY_PRESET   1
	instruction codes More...
#define	CDG_INST_BORDER_PRESET   2
#define	CDG_INST_TILE_BLOCK   6
#define	CDG_INST_SCROLL_PRESET   20
#define	CDG_INST_SCROLL_COPY   24
#define	CDG_INST_TRANSPARENT_COL   28
#define	CDG_INST_LOAD_PAL_LO   30
#define	CDG_INST_LOAD_PAL_HIGH   31
#define	CDG_INST_TILE_BLOCK_XOR   38
#define	CDG_PACKET_SIZE   24
	data sizes More...
#define	CDG_DATA_SIZE   16
#define	CDG_TILE_HEIGHT   12
#define	CDG_TILE_WIDTH   6
#define	CDG_MINIMUM_PKT_SIZE   6
#define	CDG_MINIMUM_SCROLL_SIZE   3
#define	CDG_HEADER_SIZE   8
#define	CDG_PALETTE_SIZE   16
#define	UP   2
#define	DOWN   1
#define	LEFT   2
#define	RIGHT   1

Functions
static av_cold int	cdg_decode_init (AVCodecContext *avctx)
static void	cdg_border_preset (CDGraphicsContext *cc, uint8_t *data)
static void	cdg_load_palette (CDGraphicsContext *cc, uint8_t *data, int low)
static int	cdg_tile_block (CDGraphicsContext *cc, uint8_t *data, int b)
static void	cdg_copy_rect_buf (int out_tl_x, int out_tl_y, uint8_t *out, int in_tl_x, int in_tl_y, uint8_t *in, int w, int h, int stride)
static void	cdg_fill_rect_preset (int tl_x, int tl_y, uint8_t *out, int color, int w, int h, int stride)
static void	cdg_fill_wrapper (int out_tl_x, int out_tl_y, uint8_t *out, int in_tl_x, int in_tl_y, uint8_t *in, int color, int w, int h, int stride, int roll)
static void	cdg_scroll (CDGraphicsContext *cc, uint8_t *data, AVFrame *new_frame, int roll_over)
static int	cdg_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
static void	cdg_decode_flush (AVCodecContext *avctx)
static av_cold int	cdg_decode_end (AVCodecContext *avctx)

Variables
const FFCodec	ff_cdgraphics_decoder

Detailed Description

CD Graphics Video Decoder.

Author

Michael Tison

See also

http://wiki.multimedia.cx/index.php?title=CD_Graphics

http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg

Definition in file cdgraphics.c.

Macro Definition Documentation

CDG_FULL_WIDTH

#define CDG_FULL_WIDTH   300

default screen sizes

Definition at line 36 of file cdgraphics.c.

CDG_FULL_HEIGHT

#define CDG_FULL_HEIGHT   216

Definition at line 37 of file cdgraphics.c.

CDG_DISPLAY_WIDTH

#define CDG_DISPLAY_WIDTH   294

Definition at line 38 of file cdgraphics.c.

CDG_DISPLAY_HEIGHT

#define CDG_DISPLAY_HEIGHT   204

Definition at line 39 of file cdgraphics.c.

CDG_BORDER_WIDTH

#define CDG_BORDER_WIDTH   6

Definition at line 40 of file cdgraphics.c.

CDG_BORDER_HEIGHT

#define CDG_BORDER_HEIGHT   12

Definition at line 41 of file cdgraphics.c.

CDG_COMMAND

#define CDG_COMMAND   0x09

masks

Definition at line 44 of file cdgraphics.c.

CDG_MASK

#define CDG_MASK   0x3F

Definition at line 45 of file cdgraphics.c.

CDG_INST_MEMORY_PRESET

#define CDG_INST_MEMORY_PRESET   1

instruction codes

Definition at line 48 of file cdgraphics.c.

CDG_INST_BORDER_PRESET

#define CDG_INST_BORDER_PRESET   2

Definition at line 49 of file cdgraphics.c.

CDG_INST_TILE_BLOCK

#define CDG_INST_TILE_BLOCK   6

Definition at line 50 of file cdgraphics.c.

CDG_INST_SCROLL_PRESET

#define CDG_INST_SCROLL_PRESET   20

Definition at line 51 of file cdgraphics.c.

CDG_INST_SCROLL_COPY

#define CDG_INST_SCROLL_COPY   24

Definition at line 52 of file cdgraphics.c.

CDG_INST_TRANSPARENT_COL

#define CDG_INST_TRANSPARENT_COL   28

Definition at line 53 of file cdgraphics.c.

CDG_INST_LOAD_PAL_LO

#define CDG_INST_LOAD_PAL_LO   30

Definition at line 54 of file cdgraphics.c.

CDG_INST_LOAD_PAL_HIGH

#define CDG_INST_LOAD_PAL_HIGH   31

Definition at line 55 of file cdgraphics.c.

CDG_INST_TILE_BLOCK_XOR

#define CDG_INST_TILE_BLOCK_XOR   38

Definition at line 56 of file cdgraphics.c.

CDG_PACKET_SIZE

#define CDG_PACKET_SIZE   24

data sizes

Definition at line 59 of file cdgraphics.c.

CDG_DATA_SIZE

#define CDG_DATA_SIZE   16

Definition at line 60 of file cdgraphics.c.

CDG_TILE_HEIGHT

#define CDG_TILE_HEIGHT   12

Definition at line 61 of file cdgraphics.c.

CDG_TILE_WIDTH

#define CDG_TILE_WIDTH   6

Definition at line 62 of file cdgraphics.c.

CDG_MINIMUM_PKT_SIZE

#define CDG_MINIMUM_PKT_SIZE   6

Definition at line 63 of file cdgraphics.c.

CDG_MINIMUM_SCROLL_SIZE

#define CDG_MINIMUM_SCROLL_SIZE   3

Definition at line 64 of file cdgraphics.c.

CDG_HEADER_SIZE

#define CDG_HEADER_SIZE   8

Definition at line 65 of file cdgraphics.c.

CDG_PALETTE_SIZE

#define CDG_PALETTE_SIZE   16

Definition at line 66 of file cdgraphics.c.

UP

#define UP   2

Definition at line 165 of file cdgraphics.c.

DOWN

#define DOWN   1

Definition at line 166 of file cdgraphics.c.

LEFT

#define LEFT   2

Definition at line 167 of file cdgraphics.c.

RIGHT

#define RIGHT   1

Definition at line 168 of file cdgraphics.c.

Function Documentation

cdg_decode_init()

static av_cold int cdg_decode_init ( AVCodecContext *  avctx )

static

Definition at line 76 of file cdgraphics.c.

cdg_border_preset()

static void cdg_border_preset ( CDGraphicsContext *  cc, uint8_t *  data  )

static

fill the top and bottom borders

fill the side borders

Definition at line 91 of file cdgraphics.c.

Referenced by cdg_decode_frame().

cdg_load_palette()

static void cdg_load_palette ( CDGraphicsContext *  cc, uint8_t *  data, int  low  )

static

Definition at line 113 of file cdgraphics.c.

Referenced by cdg_decode_frame().

cdg_tile_block()

static int cdg_tile_block ( CDGraphicsContext *  cc, uint8_t *  data, int  b  )

static

Definition at line 131 of file cdgraphics.c.

Referenced by cdg_decode_frame().

cdg_copy_rect_buf()

static void cdg_copy_rect_buf ( int  out_tl_x, int  out_tl_y, uint8_t *  out, int  in_tl_x, int  in_tl_y, uint8_t *  in, int  w, int  h, int  stride  )

static

Definition at line 170 of file cdgraphics.c.

Referenced by cdg_fill_wrapper().

cdg_fill_rect_preset()

static void cdg_fill_rect_preset ( int  tl_x, int  tl_y, uint8_t *  out, int  color, int  w, int  h, int  stride  )

static

Definition at line 182 of file cdgraphics.c.

Referenced by cdg_fill_wrapper().

cdg_fill_wrapper()

static void cdg_fill_wrapper ( int  out_tl_x, int  out_tl_y, uint8_t *  out, int  in_tl_x, int  in_tl_y, uint8_t *  in, int  color, int  w, int  h, int  stride, int  roll  )

static

Definition at line 191 of file cdgraphics.c.

Referenced by cdg_scroll().

cdg_scroll()

static void cdg_scroll ( CDGraphicsContext *  cc, uint8_t *  data, AVFrame *  new_frame, int  roll_over  )

static

find the difference and save the offset for cdg_tile_block usage

Definition at line 203 of file cdgraphics.c.

Referenced by cdg_decode_frame().

cdg_decode_frame()

static int cdg_decode_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 265 of file cdgraphics.c.

cdg_decode_flush()

static void cdg_decode_flush ( AVCodecContext *  avctx )

static

Definition at line 369 of file cdgraphics.c.

cdg_decode_end()

static av_cold int cdg_decode_end ( AVCodecContext *  avctx )

static

Definition at line 381 of file cdgraphics.c.

Variable Documentation

ff_cdgraphics_decoder

const FFCodec ff_cdgraphics_decoder

Initial value:

= {
    .p.name         = "cdgraphics",
    CODEC_LONG_NAME("CD Graphics video"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_CDGRAPHICS,
    .priv_data_size = sizeof(CDGraphicsContext),
    .init           = cdg_decode_init,
    .close          = cdg_decode_end,
    FF_CODEC_DECODE_CB(cdg_decode_frame),
    .flush          = cdg_decode_flush,
    .p.capabilities = AV_CODEC_CAP_DR1,
}

Definition at line 390 of file cdgraphics.c.