g2meet.c File Reference

#include <inttypes.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "elsdec.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "jpegtables.h"
#include "mjpeg.h"
#include "mjpegdec.h"

Go to the source code of this file.

Data Structures
struct	ePICPixListElem
struct	ePICPixHashElem
struct	ePICPixHash
struct	ePICContext
struct	JPGContext
struct	G2MContext

Macros
#define	EPIC_PIX_STACK_SIZE   1024
#define	EPIC_PIX_STACK_MAX   (EPIC_PIX_STACK_SIZE - 1)
#define	EPIC_HASH_SIZE   256
#define	LOAD_NEIGHBOURS(x)
#define	UPDATE_NEIGHBOURS(x)
#define	R_shift   16
#define	G_shift   8
#define	B_shift   0
#define	TOSIGNED(val)   (((val) >> 1) ^ -((val) & 1))
#define	APPLY_ALPHA(src, new, alpha)   src = (src * (256 - alpha) + new * alpha) >> 8

Enumerations
enum	ChunkType {   DISPLAY_INFO = 0xC8, TILE_DATA, CURSOR_POS, CURSOR_SHAPE,   CHUNK_CC, CHUNK_CD, CHUNK_TYPE_DATA = 0x4424, CHUNK_TYPE_ASF_HEADER = 0x4824,   CHUNK_TYPE_END = 0x4524, CHUNK_TYPE_STREAM_CHANGE = 0x4324 }
enum	Compression { COMPR_EPIC_J_B = 2, COMPR_KEMPF_J_B }

Functions
static av_cold int	jpg_init (AVCodecContext *avctx, JPGContext *c)
static av_cold void	jpg_free_context (JPGContext *ctx)
static void	jpg_unescape (const uint8_t *src, int src_size, uint8_t *dst, int *dst_size)
static int	jpg_decode_block (JPGContext *c, GetBitContext *gb, int plane, int16_t *block)
static void	yuv2rgb (uint8_t *out, int ridx, int Y, int U, int V)
static int	jpg_decode_data (JPGContext *c, int width, int height, const uint8_t *src, int src_size, uint8_t *dst, int dst_stride, const uint8_t *mask, int mask_stride, int num_mbs, int swapuv)
static int	djb2_hash (uint32_t key)
static void	epic_hash_init (ePICPixHash *hash)
static ePICPixHashElem *	epic_hash_find (const ePICPixHash *hash, uint32_t key)
static ePICPixHashElem *	epic_hash_add (ePICPixHash *hash, uint32_t key)
static int	epic_add_pixel_to_cache (ePICPixHash *hash, uint32_t key, uint32_t pix)
static int	epic_cache_entries_for_pixel (const ePICPixHash *hash, uint32_t pix)
static void	epic_free_pixel_cache (ePICPixHash *hash)
static int	is_pixel_on_stack (const ePICContext *dc, uint32_t pix)
static int	epic_decode_component_pred (ePICContext *dc, int N, int W, int NW)
static uint32_t	epic_decode_pixel_pred (ePICContext *dc, int x, int y, const uint32_t *curr_row, const uint32_t *above_row)
static int	epic_predict_pixel (ePICContext *dc, uint8_t *rung, uint32_t *pPix, uint32_t pix)
static int	epic_handle_edges (ePICContext *dc, int x, int y, const uint32_t *curr_row, const uint32_t *above_row, uint32_t *pPix)
static int	epic_decode_run_length (ePICContext *dc, int x, int y, int tile_width, const uint32_t *curr_row, const uint32_t *above_row, const uint32_t *above2_row, uint32_t *pPix, int *pRun)
static int	epic_predict_pixel2 (ePICContext *dc, uint8_t *rung, uint32_t *pPix, uint32_t pix)
static int	epic_predict_from_NW_NE (ePICContext *dc, int x, int y, int run, int tile_width, const uint32_t *curr_row, const uint32_t *above_row, uint32_t *pPix)
static int	epic_decode_from_cache (ePICContext *dc, uint32_t W, uint32_t *pPix)
static int	epic_decode_tile (ePICContext *dc, uint8_t *out, int tile_height, int tile_width, int stride)
static int	epic_jb_decode_tile (G2MContext *c, int tile_x, int tile_y, const uint8_t *src, size_t src_size, AVCodecContext *avctx)
static int	kempf_restore_buf (const uint8_t *src, int len, uint8_t *dst, int stride, const uint8_t *jpeg_tile, int tile_stride, int width, int height, const uint8_t *pal, int npal, int tidx)
static int	kempf_decode_tile (G2MContext *c, int tile_x, int tile_y, const uint8_t *src, int src_size)
static int	g2m_init_buffers (G2MContext *c)
static int	g2m_load_cursor (AVCodecContext *avctx, G2MContext *c, GetByteContext *gb)
static void	g2m_paint_cursor (G2MContext *c, uint8_t *dst, int stride)
static int	g2m_decode_frame (AVCodecContext *avctx, AVFrame *pic, int *got_picture_ptr, AVPacket *avpkt)
static av_cold int	g2m_decode_init (AVCodecContext *avctx)
static av_cold int	g2m_decode_end (AVCodecContext *avctx)

Variables
static const uint8_t	luma_quant [64]
static const uint8_t	chroma_quant [64]
const FFCodec	ff_g2m_decoder

Detailed Description

Go2Webinar / Go2Meeting decoder

Definition in file g2meet.c.

Macro Definition Documentation

EPIC_PIX_STACK_SIZE

#define EPIC_PIX_STACK_SIZE   1024

Definition at line 47 of file g2meet.c.

EPIC_PIX_STACK_MAX

#define EPIC_PIX_STACK_MAX   (EPIC_PIX_STACK_SIZE - 1)

Definition at line 48 of file g2meet.c.

EPIC_HASH_SIZE

#define EPIC_HASH_SIZE   256

Definition at line 97 of file g2meet.c.

LOAD_NEIGHBOURS

#define LOAD_NEIGHBOURS

(

x

)

Value:

    W   = curr_row[(x)   - 1];  \
    N   = above_row[(x)];       \
    WW  = curr_row[(x)   - 2];  \
    NW  = above_row[(x)  - 1];  \
    NE  = above_row[(x)  + 1];  \
    NN  = above2_row[(x)];      \
    NNW = above2_row[(x) - 1];  \
    NWW = above_row[(x)  - 2];  \
    NNE = above2_row[(x) + 1]

Definition at line 352 of file g2meet.c.

UPDATE_NEIGHBOURS

#define UPDATE_NEIGHBOURS

(

x

)

Value:

    NNW = NN;                   \
    NN  = NNE;                  \
    NWW = NW;                   \
    NW  = N;                    \
    N   = NE;                   \
    NE  = above_row[(x)  + 1];  \
    NNE = above2_row[(x) + 1]

Definition at line 363 of file g2meet.c.

R_shift

#define R_shift   16

Definition at line 372 of file g2meet.c.

G_shift

#define G_shift   8

Definition at line 373 of file g2meet.c.

B_shift

#define B_shift   0

Definition at line 374 of file g2meet.c.

TOSIGNED

#define TOSIGNED

(

val

)

(((val) >> 1) ^ -((val) & 1))

Definition at line 491 of file g2meet.c.

APPLY_ALPHA

#define APPLY_ALPHA	(		src,
			new,
			alpha
	)		src = (src * (256 - alpha) + new * alpha) >> 8

Definition at line 1323 of file g2meet.c.

Enumeration Type Documentation

ChunkType

enum ChunkType

Enumerator
DISPLAY_INFO
TILE_DATA
CURSOR_POS
CURSOR_SHAPE
CHUNK_CC
CHUNK_CD
CHUNK_TYPE_DATA
CHUNK_TYPE_ASF_HEADER
CHUNK_TYPE_END
CHUNK_TYPE_STREAM_CHANGE

Definition at line 50 of file g2meet.c.

Compression

enum Compression

Enumerator
COMPR_EPIC_J_B
COMPR_KEMPF_J_B

Definition at line 59 of file g2meet.c.

Function Documentation

jpg_init()

static av_cold int jpg_init ( AVCodecContext *  avctx, JPGContext *  c  )

static

Definition at line 164 of file g2meet.c.

Referenced by g2m_decode_init().

jpg_free_context()

static av_cold void jpg_free_context ( JPGContext *  ctx )

static

Definition at line 193 of file g2meet.c.

Referenced by g2m_decode_end().

jpg_unescape()

static void jpg_unescape ( const uint8_t *  src, int  src_size, uint8_t *  dst, int *  dst_size  )

static

Definition at line 205 of file g2meet.c.

Referenced by jpg_decode_data().

jpg_decode_block()

static int jpg_decode_block ( JPGContext *  c, GetBitContext *  gb, int  plane, int16_t *  block  )

static

Definition at line 222 of file g2meet.c.

Referenced by jpg_decode_data().

yuv2rgb()

static void yuv2rgb ( uint8_t *  out, int  ridx, int  Y, int  U, int  V  )

inlinestatic

Definition at line 262 of file g2meet.c.

Referenced by create_filtergraph(), jpg_decode_data(), and tonemap_opencl_init().

jpg_decode_data()

static int jpg_decode_data ( JPGContext *  c, int  width, int  height, const uint8_t *  src, int  src_size, uint8_t *  dst, int  dst_stride, const uint8_t *  mask, int  mask_stride, int  num_mbs, int  swapuv  )

static

Definition at line 269 of file g2meet.c.

Referenced by epic_jb_decode_tile(), and kempf_decode_tile().

djb2_hash()

static int djb2_hash ( uint32_t  key )

static

Definition at line 377 of file g2meet.c.

Referenced by epic_hash_add(), and epic_hash_find().

epic_hash_init()

static void epic_hash_init ( ePICPixHash *  hash )

static

Definition at line 389 of file g2meet.c.

Referenced by epic_jb_decode_tile().

epic_hash_find()

static ePICPixHashElem* epic_hash_find ( const ePICPixHash *  hash, uint32_t  key  )

static

Definition at line 394 of file g2meet.c.

Referenced by epic_add_pixel_to_cache(), epic_cache_entries_for_pixel(), and epic_decode_from_cache().

epic_hash_add()

static ePICPixHashElem* epic_hash_add ( ePICPixHash *  hash, uint32_t  key  )

static

Definition at line 406 of file g2meet.c.

Referenced by epic_add_pixel_to_cache().

epic_add_pixel_to_cache()

static int epic_add_pixel_to_cache ( ePICPixHash *  hash, uint32_t  key, uint32_t  pix  )

static

Definition at line 429 of file g2meet.c.

Referenced by epic_decode_tile().

epic_cache_entries_for_pixel()

static int epic_cache_entries_for_pixel ( const ePICPixHash *  hash, uint32_t  pix  )

inlinestatic

Definition at line 450 of file g2meet.c.

Referenced by epic_decode_tile().

epic_free_pixel_cache()

static void epic_free_pixel_cache ( ePICPixHash *  hash )

static

Definition at line 461 of file g2meet.c.

Referenced by epic_jb_decode_tile().

is_pixel_on_stack()

static int is_pixel_on_stack ( const ePICContext *  dc, uint32_t  pix  )

inlinestatic

Definition at line 480 of file g2meet.c.

Referenced by epic_decode_from_cache(), epic_decode_run_length(), epic_decode_tile(), and epic_predict_from_NW_NE().

epic_decode_component_pred()

static int epic_decode_component_pred ( ePICContext *  dc, int  N, int  W, int  NW  )

inlinestatic

Definition at line 493 of file g2meet.c.

Referenced by epic_decode_pixel_pred().

epic_decode_pixel_pred()

static uint32_t epic_decode_pixel_pred ( ePICContext *  dc, int  x, int  y, const uint32_t *  curr_row, const uint32_t *  above_row  )

static

Definition at line 500 of file g2meet.c.

Referenced by epic_decode_tile().

epic_predict_pixel()

static int epic_predict_pixel ( ePICContext *  dc, uint8_t *  rung, uint32_t *  pPix, uint32_t  pix  )

static

Definition at line 552 of file g2meet.c.

Referenced by epic_handle_edges().

epic_handle_edges()

static int epic_handle_edges ( ePICContext *  dc, int  x, int  y, const uint32_t *  curr_row, const uint32_t *  above_row, uint32_t *  pPix  )

static

Definition at line 563 of file g2meet.c.

Referenced by epic_decode_tile().

epic_decode_run_length()

static int epic_decode_run_length ( ePICContext *  dc, int  x, int  y, int  tile_width, const uint32_t *  curr_row, const uint32_t *  above_row, const uint32_t *  above2_row, uint32_t *  pPix, int *  pRun  )

static

Definition at line 594 of file g2meet.c.

Referenced by epic_decode_tile().

epic_predict_pixel2()

static int epic_predict_pixel2 ( ePICContext *  dc, uint8_t *  rung, uint32_t *  pPix, uint32_t  pix  )

static

Definition at line 729 of file g2meet.c.

Referenced by epic_predict_from_NW_NE().

epic_predict_from_NW_NE()

static int epic_predict_from_NW_NE ( ePICContext *  dc, int  x, int  y, int  run, int  tile_width, const uint32_t *  curr_row, const uint32_t *  above_row, uint32_t *  pPix  )

static

Definition at line 740 of file g2meet.c.

Referenced by epic_decode_tile().

epic_decode_from_cache()

static int epic_decode_from_cache ( ePICContext *  dc, uint32_t  W, uint32_t *  pPix  )

static

Definition at line 768 of file g2meet.c.

Referenced by epic_decode_tile().

epic_decode_tile()

static int epic_decode_tile ( ePICContext *  dc, uint8_t *  out, int  tile_height, int  tile_width, int  stride  )

static

Definition at line 797 of file g2meet.c.

Referenced by epic_jb_decode_tile().

epic_jb_decode_tile()

static int epic_jb_decode_tile ( G2MContext *  c, int  tile_x, int  tile_y, const uint8_t *  src, size_t  src_size, AVCodecContext *  avctx  )

static

Definition at line 863 of file g2meet.c.

Referenced by g2m_decode_frame().

kempf_restore_buf()

static int kempf_restore_buf ( const uint8_t *  src, int  len, uint8_t *  dst, int  stride, const uint8_t *  jpeg_tile, int  tile_stride, int  width, int  height, const uint8_t *  pal, int  npal, int  tidx  )

static

Definition at line 1014 of file g2meet.c.

Referenced by kempf_decode_tile().

kempf_decode_tile()

static int kempf_decode_tile ( G2MContext *  c, int  tile_x, int  tile_y, const uint8_t *  src, int  src_size  )

static

Definition at line 1049 of file g2meet.c.

Referenced by g2m_decode_frame().

g2m_init_buffers()

static int g2m_init_buffers ( G2MContext *  c )

static

Definition at line 1160 of file g2meet.c.

Referenced by g2m_decode_frame().

g2m_load_cursor()

static int g2m_load_cursor ( AVCodecContext *  avctx, G2MContext *  c, GetByteContext *  gb  )

static

Definition at line 1204 of file g2meet.c.

Referenced by g2m_decode_frame().

g2m_paint_cursor()

static void g2m_paint_cursor ( G2MContext *  c, uint8_t *  dst, int  stride  )

static

Definition at line 1326 of file g2meet.c.

Referenced by g2m_decode_frame().

g2m_decode_frame()

static int g2m_decode_frame ( AVCodecContext *  avctx, AVFrame *  pic, int *  got_picture_ptr, AVPacket *  avpkt  )

static

Definition at line 1375 of file g2meet.c.

g2m_decode_init()

static av_cold int g2m_decode_init ( AVCodecContext *  avctx )

static

Definition at line 1588 of file g2meet.c.

g2m_decode_end()

static av_cold int g2m_decode_end ( AVCodecContext *  avctx )

static

Definition at line 1607 of file g2meet.c.

Variable Documentation

luma_quant

const uint8_t luma_quant[64]

static

Initial value:

= {
     8,  6,  5,  8, 12, 20, 26, 31,
     6,  6,  7, 10, 13, 29, 30, 28,
     7,  7,  8, 12, 20, 29, 35, 28,
     7,  9, 11, 15, 26, 44, 40, 31,
     9, 11, 19, 28, 34, 55, 52, 39,
    12, 18, 28, 32, 41, 52, 57, 46,
    25, 32, 39, 44, 52, 61, 60, 51,
    36, 46, 48, 49, 56, 50, 52, 50
}

Definition at line 64 of file g2meet.c.

Referenced by jpg_decode_block().

chroma_quant

const uint8_t chroma_quant[64]

static

Initial value:

= {
     9,  9, 12, 24, 50, 50, 50, 50,
     9, 11, 13, 33, 50, 50, 50, 50,
    12, 13, 28, 50, 50, 50, 50, 50,
    24, 33, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
    50, 50, 50, 50, 50, 50, 50, 50,
}

Definition at line 75 of file g2meet.c.

Referenced by jpg_decode_block().

ff_g2m_decoder

const FFCodec ff_g2m_decoder

Initial value:

= {
    .p.name         = "g2m",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Go2Meeting"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_G2M,
    .priv_data_size = sizeof(G2MContext),
    .init           = g2m_decode_init,
    .close          = g2m_decode_end,
    FF_CODEC_DECODE_CB(g2m_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 1625 of file g2meet.c.