CD Graphics Video Decoder. More...

#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"

Data Structures
struct	CDGraphicsContext

Macros
#define	CDG_FULL_WIDTH 300
	default screen sizes

#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

#define	CDG_MASK 0x3F

#define	CDG_INST_MEMORY_PRESET 1
	instruction codes

#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_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

#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 void	cdg_init_frame (AVFrame *frame)

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, void data, int got_frame, AVPacket avpkt)

static av_cold int	cdg_decode_end (AVCodecContext *avctx)

Variables
AVCodec	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

#define CDG_FULL_WIDTH 300

default screen sizes

Definition at line 35 of file cdgraphics.c.

Referenced by cdg_border_preset(), cdg_decode_init(), cdg_scroll(), and cdg_tile_block().

#define CDG_FULL_HEIGHT 216

Definition at line 36 of file cdgraphics.c.

Referenced by cdg_border_preset(), cdg_decode_frame(), cdg_decode_init(), cdg_scroll(), and cdg_tile_block().

#define CDG_DISPLAY_WIDTH 294

Definition at line 37 of file cdgraphics.c.

#define CDG_DISPLAY_HEIGHT 204

Definition at line 38 of file cdgraphics.c.

#define CDG_BORDER_WIDTH 6

Definition at line 39 of file cdgraphics.c.

Referenced by cdg_border_preset(), and cdg_scroll().

#define CDG_BORDER_HEIGHT 12

Definition at line 40 of file cdgraphics.c.

Referenced by cdg_border_preset(), and cdg_scroll().

#define CDG_COMMAND 0x09

masks

Definition at line 43 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_MASK 0x3F

Definition at line 44 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_MEMORY_PRESET 1

instruction codes

Definition at line 47 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_BORDER_PRESET 2

Definition at line 48 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_TILE_BLOCK 6

Definition at line 49 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_SCROLL_PRESET 20

Definition at line 50 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_SCROLL_COPY 24

Definition at line 51 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_LOAD_PAL_LO 30

Definition at line 52 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_LOAD_PAL_HIGH 31

Definition at line 53 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_INST_TILE_BLOCK_XOR 38

Definition at line 54 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_PACKET_SIZE 24

data sizes

Definition at line 57 of file cdgraphics.c.

#define CDG_DATA_SIZE 16

Definition at line 58 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_TILE_HEIGHT 12

Definition at line 59 of file cdgraphics.c.

Referenced by cdg_tile_block().

#define CDG_TILE_WIDTH 6

Definition at line 60 of file cdgraphics.c.

Referenced by cdg_tile_block().

#define CDG_MINIMUM_PKT_SIZE 6

Definition at line 61 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_MINIMUM_SCROLL_SIZE 3

Definition at line 62 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_HEADER_SIZE 8

Definition at line 63 of file cdgraphics.c.

Referenced by cdg_decode_frame().

#define CDG_PALETTE_SIZE 16

Definition at line 64 of file cdgraphics.c.

Referenced by cdg_scroll().

#define UP 2

Definition at line 169 of file cdgraphics.c.

Referenced by cdg_scroll().

#define DOWN 1

Definition at line 170 of file cdgraphics.c.

Referenced by cdg_scroll().

#define LEFT 2

Definition at line 171 of file cdgraphics.c.

Referenced by cdg_scroll(), decode_frame(), decode_init(), decode_pixel_in_context(), ff_h264_decode_mb_cabac(), ff_h264_filter_mb(), fill_decode_caches(), mss4_decode_dct(), mss4_decode_dct_block(), and mss4_update_dc_cache().

#define RIGHT 1

Definition at line 172 of file cdgraphics.c.

Referenced by cdg_scroll().

Function Documentation

static void cdg_init_frame ( AVFrame * frame )

static

Definition at line 72 of file cdgraphics.c.

Referenced by cdg_decode_frame(), and cdg_decode_init().

static av_cold int cdg_decode_init ( AVCodecContext * avctx )

static

Definition at line 82 of file cdgraphics.c.

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

static

fill the top and bottom borders

fill the side borders

Definition at line 95 of file cdgraphics.c.

Referenced by cdg_decode_frame().

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

static

Definition at line 117 of file cdgraphics.c.

Referenced by cdg_decode_frame().

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

static

Definition at line 135 of file cdgraphics.c.

Referenced by cdg_decode_frame().

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 174 of file cdgraphics.c.

Referenced by cdg_fill_wrapper().

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 186 of file cdgraphics.c.

Referenced by 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 195 of file cdgraphics.c.

Referenced by 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 207 of file cdgraphics.c.

Referenced by cdg_decode_frame().

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

static

skipping 2 unneeded bytes

Definition at line 269 of file cdgraphics.c.

static av_cold int cdg_decode_end ( AVCodecContext * avctx )

static

Definition at line 371 of file cdgraphics.c.

Variable Documentation

AVCodec ff_cdgraphics_decoder

Initial value:

= {
    .name           = "cdgraphics",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_CDGRAPHICS,
    .priv_data_size = sizeof(CDGraphicsContext),
    .init           = cdg_decode_init,
    .close          = cdg_decode_end,
    .decode         = cdg_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("CD Graphics video"),
}

Definition at line 381 of file cdgraphics.c.

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation