FFmpeg
Data Structures | Macros | Functions | Variables
cdgraphics.c File Reference

CD Graphics Video Decoder. More...

#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.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",
.p.long_name = NULL_IF_CONFIG_SMALL("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,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
}

Definition at line 390 of file cdgraphics.c.

cdg_decode_frame
static int cdg_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: cdgraphics.c:265
init
static int init
Definition: av_tx.c:47
cdg_decode_flush
static void cdg_decode_flush(AVCodecContext *avctx)
Definition: cdgraphics.c:369
cdg_decode_init
static av_cold int cdg_decode_init(AVCodecContext *avctx)
Definition: cdgraphics.c:76
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:254
cdg_decode_end
static av_cold int cdg_decode_end(AVCodecContext *avctx)
Definition: cdgraphics.c:381
AV_CODEC_ID_CDGRAPHICS
@ AV_CODEC_ID_CDGRAPHICS
Definition: codec_id.h:182
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: codec_internal.h:31
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
CDGraphicsContext
Definition: cdgraphics.c:68
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